97 files changed, 4556 insertions, 1377 deletions

diff --git a/src/decoder/DecoderAPI.cxx b/src/decoder/DecoderAPI.cxx
new file mode 100644
index 000000000..4794d60e7
--- /dev/null
+++ b/src/decoder/DecoderAPI.cxx
@@ -0,0 +1,641 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderAPI.hxx"
+#include "DecoderError.hxx"
+#include "pcm/PcmConvert.hxx"
+#include "AudioConfig.hxx"
+#include "ReplayGainConfig.hxx"
+#include "MusicChunk.hxx"
+#include "MusicBuffer.hxx"
+#include "MusicPipe.hxx"
+#include "DecoderControl.hxx"
+#include "DecoderInternal.hxx"
+#include "DetachedSong.hxx"
+#include "input/InputStream.hxx"
+#include "util/Error.hxx"
+#include "util/ConstBuffer.hxx"
+#include "Log.hxx"
+
+#include <assert.h>
+#include <string.h>
+#include <math.h>
+
+void
+decoder_initialized(Decoder &decoder,
+		    const AudioFormat audio_format,
+		    bool seekable, SignedSongTime duration)
+{
+	DecoderControl &dc = decoder.dc;
+	struct audio_format_string af_string;
+
+	assert(dc.state == DecoderState::START);
+	assert(dc.pipe != nullptr);
+	assert(dc.pipe->IsEmpty());
+	assert(decoder.convert == nullptr);
+	assert(decoder.stream_tag == nullptr);
+	assert(decoder.decoder_tag == nullptr);
+	assert(!decoder.seeking);
+	assert(audio_format.IsDefined());
+	assert(audio_format.IsValid());
+
+	dc.in_audio_format = audio_format;
+	dc.out_audio_format = getOutputAudioFormat(audio_format);
+
+	dc.seekable = seekable;
+	dc.total_time = duration;
+
+	FormatDebug(decoder_domain, "audio_format=%s, seekable=%s",
+		    audio_format_to_string(dc.in_audio_format, &af_string),
+		    seekable ? "true" : "false");
+
+	if (dc.in_audio_format != dc.out_audio_format) {
+		FormatDebug(decoder_domain, "converting to %s",
+			    audio_format_to_string(dc.out_audio_format,
+						   &af_string));
+
+		decoder.convert = new PcmConvert();
+
+		Error error;
+		if (!decoder.convert->Open(dc.in_audio_format,
+					   dc.out_audio_format,
+					   error))
+			decoder.error = std::move(error);
+	}
+
+	dc.Lock();
+	dc.state = DecoderState::DECODE;
+	dc.client_cond.signal();
+	dc.Unlock();
+}
+
+/**
+ * Checks if we need an "initial seek".  If so, then the initial seek
+ * is prepared, and the function returns true.
+ */
+gcc_pure
+static bool
+decoder_prepare_initial_seek(Decoder &decoder)
+{
+	const DecoderControl &dc = decoder.dc;
+	assert(dc.pipe != nullptr);
+
+	if (dc.state != DecoderState::DECODE)
+		/* wait until the decoder has finished initialisation
+		   (reading file headers etc.) before emitting the
+		   virtual "SEEK" command */
+		return false;
+
+	if (decoder.initial_seek_running)
+		/* initial seek has already begun - override any other
+		   command */
+		return true;
+
+	if (decoder.initial_seek_pending) {
+		if (!dc.seekable) {
+			/* seeking is not possible */
+			decoder.initial_seek_pending = false;
+			return false;
+		}
+
+		if (dc.command == DecoderCommand::NONE) {
+			/* begin initial seek */
+
+			decoder.initial_seek_pending = false;
+			decoder.initial_seek_running = true;
+			return true;
+		}
+
+		/* skip initial seek when there's another command
+		   (e.g. STOP) */
+
+		decoder.initial_seek_pending = false;
+	}
+
+	return false;
+}
+
+/**
+ * Returns the current decoder command.  May return a "virtual"
+ * synthesized command, e.g. to seek to the beginning of the CUE
+ * track.
+ */
+gcc_pure
+static DecoderCommand
+decoder_get_virtual_command(Decoder &decoder)
+{
+	if (decoder.error.IsDefined())
+		/* an error has occurred: stop the decoder plugin */
+		return DecoderCommand::STOP;
+
+	const DecoderControl &dc = decoder.dc;
+	assert(dc.pipe != nullptr);
+
+	if (decoder_prepare_initial_seek(decoder))
+		return DecoderCommand::SEEK;
+
+	return dc.command;
+}
+
+DecoderCommand
+decoder_get_command(Decoder &decoder)
+{
+	return decoder_get_virtual_command(decoder);
+}
+
+void
+decoder_command_finished(Decoder &decoder)
+{
+	DecoderControl &dc = decoder.dc;
+
+	dc.Lock();
+
+	assert(dc.command != DecoderCommand::NONE ||
+	       decoder.initial_seek_running);
+	assert(dc.command != DecoderCommand::SEEK ||
+	       decoder.initial_seek_running ||
+	       dc.seek_error || decoder.seeking);
+	assert(dc.pipe != nullptr);
+
+	if (decoder.initial_seek_running) {
+		assert(!decoder.seeking);
+		assert(decoder.chunk == nullptr);
+		assert(dc.pipe->IsEmpty());
+
+		decoder.initial_seek_running = false;
+		decoder.timestamp = dc.start_time.ToDoubleS();
+		dc.Unlock();
+		return;
+	}
+
+	if (decoder.seeking) {
+		decoder.seeking = false;
+
+		/* delete frames from the old song position */
+
+		if (decoder.chunk != nullptr) {
+			dc.buffer->Return(decoder.chunk);
+			decoder.chunk = nullptr;
+		}
+
+		dc.pipe->Clear(*dc.buffer);
+
+		decoder.timestamp = dc.seek_time.ToDoubleS();
+	}
+
+	dc.command = DecoderCommand::NONE;
+	dc.client_cond.signal();
+	dc.Unlock();
+}
+
+SongTime
+decoder_seek_time(Decoder &decoder)
+{
+	const DecoderControl &dc = decoder.dc;
+
+	assert(dc.pipe != nullptr);
+
+	if (decoder.initial_seek_running)
+		return dc.start_time;
+
+	assert(dc.command == DecoderCommand::SEEK);
+
+	decoder.seeking = true;
+
+	return dc.seek_time;
+}
+
+uint64_t
+decoder_seek_where_frame(Decoder &decoder)
+{
+	const DecoderControl &dc = decoder.dc;
+
+	return decoder_seek_time(decoder).ToScale<uint64_t>(dc.in_audio_format.sample_rate);
+}
+
+void decoder_seek_error(Decoder & decoder)
+{
+	DecoderControl &dc = decoder.dc;
+
+	assert(dc.pipe != nullptr);
+
+	if (decoder.initial_seek_running) {
+		/* d'oh, we can't seek to the sub-song start position,
+		   what now? - no idea, ignoring the problem for now. */
+		decoder.initial_seek_running = false;
+		return;
+	}
+
+	assert(dc.command == DecoderCommand::SEEK);
+
+	dc.seek_error = true;
+	decoder.seeking = false;
+
+	decoder_command_finished(decoder);
+}
+
+InputStream *
+decoder_open_uri(Decoder &decoder, const char *uri, Error &error)
+{
+	assert(decoder.dc.state == DecoderState::START ||
+	       decoder.dc.state == DecoderState::DECODE);
+
+	DecoderControl &dc = decoder.dc;
+	Mutex &mutex = dc.mutex;
+	Cond &cond = dc.cond;
+
+	InputStream *is = InputStream::Open(uri, mutex, cond, error);
+	if (is == nullptr)
+		return nullptr;
+
+	mutex.lock();
+	while (true) {
+		is->Update();
+		if (is->IsReady()) {
+			mutex.unlock();
+			return is;
+		}
+
+		if (dc.command == DecoderCommand::STOP) {
+			mutex.unlock();
+			delete is;
+			return nullptr;
+		}
+
+		cond.wait(mutex);
+	}
+}
+
+/**
+ * Should be read operation be cancelled?  That is the case when the
+ * player thread has sent a command such as "STOP".
+ */
+gcc_pure
+static inline bool
+decoder_check_cancel_read(const Decoder *decoder)
+{
+	if (decoder == nullptr)
+		return false;
+
+	const DecoderControl &dc = decoder->dc;
+	if (dc.command == DecoderCommand::NONE)
+		return false;
+
+	/* ignore the SEEK command during initialization, the plugin
+	   should handle that after it has initialized successfully */
+	if (dc.command == DecoderCommand::SEEK &&
+	    (dc.state == DecoderState::START || decoder->seeking))
+		return false;
+
+	return true;
+}
+
+size_t
+decoder_read(Decoder *decoder,
+	     InputStream &is,
+	     void *buffer, size_t length)
+{
+	/* XXX don't allow decoder==nullptr */
+
+	assert(decoder == nullptr ||
+	       decoder->dc.state == DecoderState::START ||
+	       decoder->dc.state == DecoderState::DECODE);
+	assert(buffer != nullptr);
+
+	if (length == 0)
+		return 0;
+
+	is.Lock();
+
+	while (true) {
+		if (decoder_check_cancel_read(decoder)) {
+			is.Unlock();
+			return 0;
+		}
+
+		if (is.IsAvailable())
+			break;
+
+		is.cond.wait(is.mutex);
+	}
+
+	Error error;
+	size_t nbytes = is.Read(buffer, length, error);
+	assert(nbytes == 0 || !error.IsDefined());
+	assert(nbytes > 0 || error.IsDefined() || is.IsEOF());
+
+	is.Unlock();
+
+	if (gcc_unlikely(nbytes == 0 && error.IsDefined()))
+		LogError(error);
+
+	return nbytes;
+}
+
+bool
+decoder_read_full(Decoder *decoder, InputStream &is,
+		  void *_buffer, size_t size)
+{
+	uint8_t *buffer = (uint8_t *)_buffer;
+
+	while (size > 0) {
+		size_t nbytes = decoder_read(decoder, is, buffer, size);
+		if (nbytes == 0)
+			return false;
+
+		buffer += nbytes;
+		size -= nbytes;
+	}
+
+	return true;
+}
+
+bool
+decoder_skip(Decoder *decoder, InputStream &is, size_t size)
+{
+	while (size > 0) {
+		char buffer[1024];
+		size_t nbytes = decoder_read(decoder, is, buffer,
+					     std::min(sizeof(buffer), size));
+		if (nbytes == 0)
+			return false;
+
+		size -= nbytes;
+	}
+
+	return true;
+}
+
+void
+decoder_timestamp(Decoder &decoder, double t)
+{
+	assert(t >= 0);
+
+	decoder.timestamp = t;
+}
+
+/**
+ * Sends a #tag as-is to the music pipe.  Flushes the current chunk
+ * (decoder.chunk) if there is one.
+ */
+static DecoderCommand
+do_send_tag(Decoder &decoder, const Tag &tag)
+{
+	MusicChunk *chunk;
+
+	if (decoder.chunk != nullptr) {
+		/* there is a partial chunk - flush it, we want the
+		   tag in a new chunk */
+		decoder.FlushChunk();
+	}
+
+	assert(decoder.chunk == nullptr);
+
+	chunk = decoder.GetChunk();
+	if (chunk == nullptr) {
+		assert(decoder.dc.command != DecoderCommand::NONE);
+		return decoder.dc.command;
+	}
+
+	chunk->tag = new Tag(tag);
+	return DecoderCommand::NONE;
+}
+
+static bool
+update_stream_tag(Decoder &decoder, InputStream *is)
+{
+	Tag *tag;
+
+	tag = is != nullptr
+		? is->LockReadTag()
+		: nullptr;
+	if (tag == nullptr) {
+		tag = decoder.song_tag;
+		if (tag == nullptr)
+			return false;
+
+		/* no stream tag present - submit the song tag
+		   instead */
+		decoder.song_tag = nullptr;
+	}
+
+	delete decoder.stream_tag;
+	decoder.stream_tag = tag;
+	return true;
+}
+
+DecoderCommand
+decoder_data(Decoder &decoder,
+	     InputStream *is,
+	     const void *data, size_t length,
+	     uint16_t kbit_rate)
+{
+	DecoderControl &dc = decoder.dc;
+	DecoderCommand cmd;
+
+	assert(dc.state == DecoderState::DECODE);
+	assert(dc.pipe != nullptr);
+	assert(length % dc.in_audio_format.GetFrameSize() == 0);
+
+	dc.Lock();
+	cmd = decoder_get_virtual_command(decoder);
+	dc.Unlock();
+
+	if (cmd == DecoderCommand::STOP || cmd == DecoderCommand::SEEK ||
+	    length == 0)
+		return cmd;
+
+	assert(!decoder.initial_seek_pending);
+	assert(!decoder.initial_seek_running);
+
+	/* send stream tags */
+
+	if (update_stream_tag(decoder, is)) {
+		if (decoder.decoder_tag != nullptr) {
+			/* merge with tag from decoder plugin */
+			Tag *tag = Tag::Merge(*decoder.decoder_tag,
+					      *decoder.stream_tag);
+			cmd = do_send_tag(decoder, *tag);
+			delete tag;
+		} else
+			/* send only the stream tag */
+			cmd = do_send_tag(decoder, *decoder.stream_tag);
+
+		if (cmd != DecoderCommand::NONE)
+			return cmd;
+	}
+
+	if (decoder.convert != nullptr) {
+		assert(dc.in_audio_format != dc.out_audio_format);
+
+		Error error;
+		auto result = decoder.convert->Convert({data, length},
+						       error);
+		if (data == nullptr) {
+			/* the PCM conversion has failed - stop
+			   playback, since we have no better way to
+			   bail out */
+			LogError(error);
+			return DecoderCommand::STOP;
+		}
+
+		data = result.data;
+		length = result.size;
+	} else {
+		assert(dc.in_audio_format == dc.out_audio_format);
+	}
+
+	while (length > 0) {
+		MusicChunk *chunk;
+		bool full;
+
+		chunk = decoder.GetChunk();
+		if (chunk == nullptr) {
+			assert(dc.command != DecoderCommand::NONE);
+			return dc.command;
+		}
+
+		const auto dest =
+			chunk->Write(dc.out_audio_format,
+				     SongTime::FromS(decoder.timestamp) -
+				     dc.song->GetStartTime(),
+				     kbit_rate);
+		if (dest.IsEmpty()) {
+			/* the chunk is full, flush it */
+			decoder.FlushChunk();
+			continue;
+		}
+
+		const size_t nbytes = std::min(dest.size, length);
+
+		/* copy the buffer */
+
+		memcpy(dest.data, data, nbytes);
+
+		/* expand the music pipe chunk */
+
+		full = chunk->Expand(dc.out_audio_format, nbytes);
+		if (full) {
+			/* the chunk is full, flush it */
+			decoder.FlushChunk();
+		}
+
+		data = (const uint8_t *)data + nbytes;
+		length -= nbytes;
+
+		decoder.timestamp += (double)nbytes /
+			dc.out_audio_format.GetTimeToSize();
+
+		if (dc.end_time.IsPositive() &&
+		    decoder.timestamp >= dc.end_time.ToDoubleS())
+			/* the end of this range has been reached:
+			   stop decoding */
+			return DecoderCommand::STOP;
+	}
+
+	return DecoderCommand::NONE;
+}
+
+DecoderCommand
+decoder_tag(Decoder &decoder, InputStream *is,
+	    Tag &&tag)
+{
+	gcc_unused const DecoderControl &dc = decoder.dc;
+	DecoderCommand cmd;
+
+	assert(dc.state == DecoderState::DECODE);
+	assert(dc.pipe != nullptr);
+
+	/* save the tag */
+
+	delete decoder.decoder_tag;
+	decoder.decoder_tag = new Tag(tag);
+
+	/* check for a new stream tag */
+
+	update_stream_tag(decoder, is);
+
+	/* check if we're seeking */
+
+	if (decoder_prepare_initial_seek(decoder))
+		/* during initial seek, no music chunk must be created
+		   until seeking is finished; skip the rest of the
+		   function here */
+		return DecoderCommand::SEEK;
+
+	/* send tag to music pipe */
+
+	if (decoder.stream_tag != nullptr) {
+		/* merge with tag from input stream */
+		Tag *merged;
+
+		merged = Tag::Merge(*decoder.stream_tag,
+				    *decoder.decoder_tag);
+		cmd = do_send_tag(decoder, *merged);
+		delete merged;
+	} else
+		/* send only the decoder tag */
+		cmd = do_send_tag(decoder, *decoder.decoder_tag);
+
+	return cmd;
+}
+
+void
+decoder_replay_gain(Decoder &decoder,
+		    const ReplayGainInfo *replay_gain_info)
+{
+	if (replay_gain_info != nullptr) {
+		static unsigned serial;
+		if (++serial == 0)
+			serial = 1;
+
+		if (REPLAY_GAIN_OFF != replay_gain_mode) {
+			ReplayGainMode rgm = replay_gain_mode;
+			if (rgm != REPLAY_GAIN_ALBUM)
+				rgm = REPLAY_GAIN_TRACK;
+
+			const auto &tuple = replay_gain_info->tuples[rgm];
+			const auto scale =
+				tuple.CalculateScale(replay_gain_preamp,
+						     replay_gain_missing_preamp,
+						     replay_gain_limit);
+			decoder.dc.replay_gain_db = 20.0 * log10f(scale);
+		}
+
+		decoder.replay_gain_info = *replay_gain_info;
+		decoder.replay_gain_serial = serial;
+
+		if (decoder.chunk != nullptr) {
+			/* flush the current chunk because the new
+			   replay gain values affect the following
+			   samples */
+			decoder.FlushChunk();
+		}
+	} else
+		decoder.replay_gain_serial = 0;
+}
+
+void
+decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp)
+{
+	DecoderControl &dc = decoder.dc;
+
+	dc.SetMixRamp(std::move(mix_ramp));
+}
diff --git a/src/decoder/DecoderAPI.hxx b/src/decoder/DecoderAPI.hxx
new file mode 100644
index 000000000..b756331d9
--- /dev/null
+++ b/src/decoder/DecoderAPI.hxx
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*! \file
+ * \brief The MPD Decoder API
+ *
+ * This is the public API which is used by decoder plugins to
+ * communicate with the mpd core.
+ */
+
+#ifndef MPD_DECODER_API_HXX
+#define MPD_DECODER_API_HXX
+
+// IWYU pragma: begin_exports
+
+#include "check.h"
+#include "DecoderCommand.hxx"
+#include "DecoderPlugin.hxx"
+#include "ReplayGainInfo.hxx"
+#include "tag/Tag.hxx"
+#include "AudioFormat.hxx"
+#include "MixRampInfo.hxx"
+#include "config/ConfigData.hxx"
+#include "Chrono.hxx"
+
+// IWYU pragma: end_exports
+
+#include <stdint.h>
+
+class Error;
+
+/**
+ * Notify the player thread that it has finished initialization and
+ * that it has read the song's meta data.
+ *
+ * @param decoder the decoder object
+ * @param audio_format the audio format which is going to be sent to
+ * decoder_data()
+ * @param seekable true if the song is seekable
+ * @param duration the total duration of this song; negative if
+ * unknown
+ */
+void
+decoder_initialized(Decoder &decoder,
+		    AudioFormat audio_format,
+		    bool seekable, SignedSongTime duration);
+
+/**
+ * Determines the pending decoder command.
+ *
+ * @param decoder the decoder object
+ * @return the current command, or DecoderCommand::NONE if there is no
+ * command pending
+ */
+gcc_pure
+DecoderCommand
+decoder_get_command(Decoder &decoder);
+
+/**
+ * Called by the decoder when it has performed the requested command
+ * (dc->command).  This function resets dc->command and wakes up the
+ * player thread.
+ *
+ * @param decoder the decoder object
+ */
+void
+decoder_command_finished(Decoder &decoder);
+
+/**
+ * Call this when you have received the DecoderCommand::SEEK command.
+ *
+ * @param decoder the decoder object
+ * @return the destination position for the seek in milliseconds
+ */
+gcc_pure
+SongTime
+decoder_seek_time(Decoder &decoder);
+
+/**
+ * Call this when you have received the DecoderCommand::SEEK command.
+ *
+ * @param decoder the decoder object
+ * @return the destination position for the seek in frames
+ */
+gcc_pure
+uint64_t
+decoder_seek_where_frame(Decoder &decoder);
+
+/**
+ * Call this instead of decoder_command_finished() when seeking has
+ * failed.
+ *
+ * @param decoder the decoder object
+ */
+void
+decoder_seek_error(Decoder &decoder);
+
+/**
+ * Open a new #InputStream and wait until it's ready.  Can get
+ * cancelled by DecoderCommand::STOP (returns nullptr without setting
+ * #Error).
+ */
+InputStream *
+decoder_open_uri(Decoder &decoder, const char *uri, Error &error);
+
+/**
+ * Blocking read from the input stream.
+ *
+ * @param decoder the decoder object
+ * @param is the input stream to read from
+ * @param buffer the destination buffer
+ * @param length the maximum number of bytes to read
+ * @return the number of bytes read, or 0 if one of the following
+ * occurs: end of file; error; command (like SEEK or STOP).
+ */
+size_t
+decoder_read(Decoder *decoder, InputStream &is,
+	     void *buffer, size_t length);
+
+static inline size_t
+decoder_read(Decoder &decoder, InputStream &is,
+	     void *buffer, size_t length)
+{
+	return decoder_read(&decoder, is, buffer, length);
+}
+
+/**
+ * Blocking read from the input stream.  Attempts to fill the buffer
+ * completely; there is no partial result.
+ *
+ * @return true on success, false on error or command or not enough
+ * data
+ */
+bool
+decoder_read_full(Decoder *decoder, InputStream &is,
+		  void *buffer, size_t size);
+
+/**
+ * Skip data on the #InputStream.
+ *
+ * @return true on success, false on error or command
+ */
+bool
+decoder_skip(Decoder *decoder, InputStream &is, size_t size);
+
+/**
+ * Sets the time stamp for the next data chunk [seconds].  The MPD
+ * core automatically counts it up, and a decoder plugin only needs to
+ * use this function if it thinks that adding to the time stamp based
+ * on the buffer size won't work.
+ */
+void
+decoder_timestamp(Decoder &decoder, double t);
+
+/**
+ * This function is called by the decoder plugin when it has
+ * successfully decoded block of input data.
+ *
+ * @param decoder the decoder object
+ * @param is an input stream which is buffering while we are waiting
+ * for the player
+ * @param data the source buffer
+ * @param length the number of bytes in the buffer
+ * @return the current command, or DecoderCommand::NONE if there is no
+ * command pending
+ */
+DecoderCommand
+decoder_data(Decoder &decoder, InputStream *is,
+	     const void *data, size_t length,
+	     uint16_t kbit_rate);
+
+static inline DecoderCommand
+decoder_data(Decoder &decoder, InputStream &is,
+	     const void *data, size_t length,
+	     uint16_t kbit_rate)
+{
+	return decoder_data(decoder, &is, data, length, kbit_rate);
+}
+
+/**
+ * This function is called by the decoder plugin when it has
+ * successfully decoded a tag.
+ *
+ * @param decoder the decoder object
+ * @param is an input stream which is buffering while we are waiting
+ * for the player
+ * @param tag the tag to send
+ * @return the current command, or DecoderCommand::NONE if there is no
+ * command pending
+ */
+DecoderCommand
+decoder_tag(Decoder &decoder, InputStream *is, Tag &&tag);
+
+static inline DecoderCommand
+decoder_tag(Decoder &decoder, InputStream &is, Tag &&tag)
+{
+	return decoder_tag(decoder, &is, std::move(tag));
+}
+
+/**
+ * Set replay gain values for the following chunks.
+ *
+ * @param decoder the decoder object
+ * @param rgi the replay_gain_info object; may be nullptr to invalidate
+ * the previous replay gain values
+ */
+void
+decoder_replay_gain(Decoder &decoder,
+		    const ReplayGainInfo *replay_gain_info);
+
+/**
+ * Store MixRamp tags.
+ *
+ * @param decoder the decoder object
+ * @param mixramp_start the mixramp_start tag; may be nullptr to invalidate
+ * @param mixramp_end the mixramp_end tag; may be nullptr to invalidate
+ */
+void
+decoder_mixramp(Decoder &decoder, MixRampInfo &&mix_ramp);
+
+#endif
diff --git a/src/decoder/DecoderBuffer.cxx b/src/decoder/DecoderBuffer.cxx
new file mode 100644
index 000000000..a8958d6fd
--- /dev/null
+++ b/src/decoder/DecoderBuffer.cxx
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderBuffer.hxx"
+#include "DecoderAPI.hxx"
+
+#include <assert.h>
+
+bool
+DecoderBuffer::Fill()
+{
+	auto w = buffer.Write();
+	if (w.IsEmpty())
+		/* buffer is full */
+		return false;
+
+	size_t nbytes = decoder_read(decoder, is,
+				     w.data, w.size);
+	if (nbytes == 0)
+		/* end of file, I/O error or decoder command
+		   received */
+		return false;
+
+	buffer.Append(nbytes);
+	return true;
+}
+
+ConstBuffer<void>
+DecoderBuffer::Need(size_t min_size)
+{
+	while (true) {
+		const auto r = Read();
+		if (r.size >= min_size)
+			return r;
+
+		if (!Fill())
+			return nullptr;
+	}
+}
+
+bool
+DecoderBuffer::Skip(size_t nbytes)
+{
+	const auto r = buffer.Read();
+	if (r.size >= nbytes) {
+		buffer.Consume(nbytes);
+		return true;
+	}
+
+	buffer.Clear();
+	nbytes -= r.size;
+
+	return decoder_skip(decoder, is, nbytes);
+}
diff --git a/src/decoder/DecoderBuffer.hxx b/src/decoder/DecoderBuffer.hxx
new file mode 100644
index 000000000..9cf47d915
--- /dev/null
+++ b/src/decoder/DecoderBuffer.hxx
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_BUFFER_HXX
+#define MPD_DECODER_BUFFER_HXX
+
+#include "Compiler.h"
+#include "util/DynamicFifoBuffer.hxx"
+#include "util/ConstBuffer.hxx"
+
+#include <stddef.h>
+
+struct Decoder;
+class InputStream;
+
+/**
+ * This objects handles buffered reads in decoder plugins easily.  You
+ * create a buffer object, and use its high-level methods to fill and
+ * read it.  It will automatically handle shifting the buffer.
+ */
+class DecoderBuffer {
+	Decoder *const decoder;
+	InputStream &is;
+
+	DynamicFifoBuffer<uint8_t> buffer;
+
+public:
+	/**
+	 * Creates a new buffer.
+	 *
+	 * @param _decoder the decoder object, used for decoder_read(),
+	 * may be nullptr
+	 * @param _is the input stream object where we should read from
+	 * @param _size the maximum size of the buffer
+	 */
+	DecoderBuffer(Decoder *_decoder, InputStream &_is,
+		      size_t _size)
+		:decoder(_decoder), is(_is), buffer(_size) {}
+
+	const InputStream &GetStream() const {
+		return is;
+	}
+
+	void Clear() {
+		buffer.Clear();
+	}
+
+	/**
+	 * Read data from the #InputStream and append it to the buffer.
+	 *
+	 * @return true if data was appended; false if there is no
+	 * data available (yet), end of file, I/O error or a decoder
+	 * command was received
+	 */
+	bool Fill();
+
+	/**
+	 * How many bytes are stored in the buffer?
+	 */
+	gcc_pure
+	size_t GetAvailable() const {
+		return buffer.GetAvailable();
+	}
+
+	/**
+	 * Reads data from the buffer.  This data is not yet consumed,
+	 * you have to call Consume() to do that.  The returned buffer
+	 * becomes invalid after a Fill() or a Consume() call.
+	 */
+	ConstBuffer<void> Read() const {
+		auto r = buffer.Read();
+		return { r.data, r.size };
+	}
+
+	/**
+	 * Wait until this number of bytes are available.  Returns nullptr on
+	 * error.
+	 */
+	ConstBuffer<void> Need(size_t min_size);
+
+	/**
+	 * Consume (delete, invalidate) a part of the buffer.  The
+	 * "nbytes" parameter must not be larger than the length
+	 * returned by Read().
+	 *
+	 * @param nbytes the number of bytes to consume
+	 */
+	void Consume(size_t nbytes) {
+		buffer.Consume(nbytes);
+	}
+
+	/**
+	 * Skips the specified number of bytes, discarding its data.
+	 *
+	 * @param nbytes the number of bytes to skip
+	 * @return true on success, false on error
+	 */
+	bool Skip(size_t nbytes);
+};
+
+#endif
diff --git a/src/decoder/DecoderCommand.hxx b/src/decoder/DecoderCommand.hxx
new file mode 100644
index 000000000..a00519644
--- /dev/null
+++ b/src/decoder/DecoderCommand.hxx
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_COMMAND_HXX
+#define MPD_DECODER_COMMAND_HXX
+
+#include <stdint.h>
+
+enum class DecoderCommand : uint8_t {
+	NONE = 0,
+	START,
+	STOP,
+	SEEK
+};
+
+#endif
diff --git a/src/decoder/DecoderControl.cxx b/src/decoder/DecoderControl.cxx
new file mode 100644
index 000000000..c30da6214
--- /dev/null
+++ b/src/decoder/DecoderControl.cxx
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderControl.hxx"
+#include "MusicPipe.hxx"
+#include "DetachedSong.hxx"
+
+#include <assert.h>
+
+DecoderControl::DecoderControl(Mutex &_mutex, Cond &_client_cond)
+	:mutex(_mutex), client_cond(_client_cond),
+	 state(DecoderState::STOP),
+	 command(DecoderCommand::NONE),
+	 client_is_waiting(false),
+	 song(nullptr),
+	 replay_gain_db(0), replay_gain_prev_db(0) {}
+
+DecoderControl::~DecoderControl()
+{
+	ClearError();
+
+	delete song;
+}
+
+void
+DecoderControl::WaitForDecoder()
+{
+	assert(!client_is_waiting);
+	client_is_waiting = true;
+
+	client_cond.wait(mutex);
+
+	assert(client_is_waiting);
+	client_is_waiting = false;
+}
+
+bool
+DecoderControl::IsCurrentSong(const DetachedSong &_song) const
+{
+	switch (state) {
+	case DecoderState::STOP:
+	case DecoderState::ERROR:
+		return false;
+
+	case DecoderState::START:
+	case DecoderState::DECODE:
+		return song->IsSame(_song);
+	}
+
+	assert(false);
+	gcc_unreachable();
+}
+
+void
+DecoderControl::Start(DetachedSong *_song,
+		      SongTime _start_time, SongTime _end_time,
+		      MusicBuffer &_buffer, MusicPipe &_pipe)
+{
+	assert(_song != nullptr);
+	assert(_pipe.IsEmpty());
+
+	delete song;
+	song = _song;
+	start_time = _start_time;
+	end_time = _end_time;
+	buffer = &_buffer;
+	pipe = &_pipe;
+
+	LockSynchronousCommand(DecoderCommand::START);
+}
+
+void
+DecoderControl::Stop()
+{
+	Lock();
+
+	if (command != DecoderCommand::NONE)
+		/* Attempt to cancel the current command.  If it's too
+		   late and the decoder thread is already executing
+		   the old command, we'll call STOP again in this
+		   function (see below). */
+		SynchronousCommandLocked(DecoderCommand::STOP);
+
+	if (state != DecoderState::STOP && state != DecoderState::ERROR)
+		SynchronousCommandLocked(DecoderCommand::STOP);
+
+	Unlock();
+}
+
+bool
+DecoderControl::Seek(SongTime t)
+{
+	assert(state != DecoderState::START);
+
+	if (state == DecoderState::STOP ||
+	    state == DecoderState::ERROR || !seekable)
+		return false;
+
+	seek_time = t;
+	seek_error = false;
+	LockSynchronousCommand(DecoderCommand::SEEK);
+
+	return !seek_error;
+}
+
+void
+DecoderControl::Quit()
+{
+	assert(thread.IsDefined());
+
+	quit = true;
+	LockAsynchronousCommand(DecoderCommand::STOP);
+
+	thread.Join();
+}
+
+void
+DecoderControl::CycleMixRamp()
+{
+	previous_mix_ramp = std::move(mix_ramp);
+	mix_ramp.Clear();
+}
diff --git a/src/decoder/DecoderControl.hxx b/src/decoder/DecoderControl.hxx
new file mode 100644
index 000000000..ed2b8c538
--- /dev/null
+++ b/src/decoder/DecoderControl.hxx
@@ -0,0 +1,395 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_CONTROL_HXX
+#define MPD_DECODER_CONTROL_HXX
+
+#include "DecoderCommand.hxx"
+#include "AudioFormat.hxx"
+#include "MixRampInfo.hxx"
+#include "thread/Mutex.hxx"
+#include "thread/Cond.hxx"
+#include "thread/Thread.hxx"
+#include "Chrono.hxx"
+#include "util/Error.hxx"
+
+#include <assert.h>
+#include <stdint.h>
+
+/* damn you, windows.h! */
+#ifdef ERROR
+#undef ERROR
+#endif
+
+class DetachedSong;
+class MusicBuffer;
+class MusicPipe;
+
+enum class DecoderState : uint8_t {
+	STOP = 0,
+	START,
+	DECODE,
+
+	/**
+	 * The last "START" command failed, because there was an I/O
+	 * error or because no decoder was able to decode the file.
+	 * This state will only come after START; once the state has
+	 * turned to DECODE, by definition no such error can occur.
+	 */
+	ERROR,
+};
+
+struct DecoderControl {
+	/**
+	 * The handle of the decoder thread.
+	 */
+	Thread thread;
+
+	/**
+	 * This lock protects #state and #command.
+	 *
+	 * This is usually a reference to PlayerControl::mutex, so
+	 * that both player thread and decoder thread share a mutex.
+	 * This simplifies synchronization with #cond and
+	 * #client_cond.
+	 */
+	Mutex &mutex;
+
+	/**
+	 * Trigger this object after you have modified #command.  This
+	 * is also used by the decoder thread to notify the caller
+	 * when it has finished a command.
+	 */
+	Cond cond;
+
+	/**
+	 * The trigger of this object's client.  It is signalled
+	 * whenever an event occurs.
+	 *
+	 * This is usually a reference to PlayerControl::cond.
+	 */
+	Cond &client_cond;
+
+	DecoderState state;
+	DecoderCommand command;
+
+	/**
+	 * The error that occurred in the decoder thread.  This
+	 * attribute is only valid if #state is #DecoderState::ERROR.
+	 * The object must be freed when this object transitions to
+	 * any other state (usually #DecoderState::START).
+	 */
+	Error error;
+
+	bool quit;
+
+	/**
+	 * Is the client currently waiting for the DecoderThread?  If
+	 * false, the DecoderThread may omit invoking Cond::signal(),
+	 * reducing the number of system calls.
+	 */
+	bool client_is_waiting;
+
+	bool seek_error;
+	bool seekable;
+	SongTime seek_time;
+
+	/** the format of the song file */
+	AudioFormat in_audio_format;
+
+	/** the format being sent to the music pipe */
+	AudioFormat out_audio_format;
+
+	/**
+	 * The song currently being decoded.  This attribute is set by
+	 * the player thread, when it sends the #DecoderCommand::START
+	 * command.
+	 *
+	 * This is a duplicate, and must be freed when this attribute
+	 * is cleared.
+	 */
+	DetachedSong *song;
+
+	/**
+	 * The initial seek position, e.g. to the start of a sub-track
+	 * described by a CUE file.
+	 *
+	 * This attribute is set by Start().
+	 */
+	SongTime start_time;
+
+	/**
+	 * The decoder will stop when it reaches this position.  0
+	 * means don't stop before the end of the file.
+	 *
+	 * This attribute is set by Start().
+	 */
+	SongTime end_time;
+
+	SignedSongTime total_time;
+
+	/** the #MusicChunk allocator */
+	MusicBuffer *buffer;
+
+	/**
+	 * The destination pipe for decoded chunks.  The caller thread
+	 * owns this object, and is responsible for freeing it.
+	 */
+	MusicPipe *pipe;
+
+	float replay_gain_db;
+	float replay_gain_prev_db;
+
+	MixRampInfo mix_ramp, previous_mix_ramp;
+
+	/**
+	 * @param _mutex see #mutex
+	 * @param _client_cond see #client_cond
+	 */
+	DecoderControl(Mutex &_mutex, Cond &_client_cond);
+	~DecoderControl();
+
+	/**
+	 * Locks the object.
+	 */
+	void Lock() const {
+		mutex.lock();
+	}
+
+	/**
+	 * Unlocks the object.
+	 */
+	void Unlock() const {
+		mutex.unlock();
+	}
+
+	/**
+	 * Signals the object.  This function is only valid in the
+	 * player thread.  The object should be locked prior to
+	 * calling this function.
+	 */
+	void Signal() {
+		cond.signal();
+	}
+
+	/**
+	 * Waits for a signal on the #DecoderControl object.  This function
+	 * is only valid in the decoder thread.  The object must be locked
+	 * prior to calling this function.
+	 */
+	void Wait() {
+		cond.wait(mutex);
+	}
+
+	/**
+	 * Waits for a signal from the decoder thread.  This object
+	 * must be locked prior to calling this function.  This method
+	 * is only valid in the player thread.
+	 *
+	 * Caller must hold the lock.
+	 */
+	void WaitForDecoder();
+
+	bool IsIdle() const {
+		return state == DecoderState::STOP ||
+			state == DecoderState::ERROR;
+	}
+
+	gcc_pure
+	bool LockIsIdle() const {
+		Lock();
+		bool result = IsIdle();
+		Unlock();
+		return result;
+	}
+
+	bool IsStarting() const {
+		return state == DecoderState::START;
+	}
+
+	gcc_pure
+	bool LockIsStarting() const {
+		Lock();
+		bool result = IsStarting();
+		Unlock();
+		return result;
+	}
+
+	bool HasFailed() const {
+		assert(command == DecoderCommand::NONE);
+
+		return state == DecoderState::ERROR;
+	}
+
+	gcc_pure
+	bool LockHasFailed() const {
+		Lock();
+		bool result = HasFailed();
+		Unlock();
+		return result;
+	}
+
+	/**
+	 * Checks whether an error has occurred, and if so, returns a
+	 * copy of the #Error object.
+	 *
+	 * Caller must lock the object.
+	 */
+	gcc_pure
+	Error GetError() const {
+		assert(command == DecoderCommand::NONE);
+		assert(state != DecoderState::ERROR || error.IsDefined());
+
+		Error result;
+		if (state == DecoderState::ERROR)
+			result.Set(error);
+		return result;
+	}
+
+	/**
+	 * Like GetError(), but locks and unlocks the object.
+	 */
+	gcc_pure
+	Error LockGetError() const {
+		Lock();
+		Error result = GetError();
+		Unlock();
+		return result;
+	}
+
+	/**
+	 * Clear the error condition and free the #Error object (if any).
+	 *
+	 * Caller must lock the object.
+	 */
+	void ClearError() {
+		if (state == DecoderState::ERROR) {
+			error.Clear();
+			state = DecoderState::STOP;
+		}
+	}
+
+	/**
+	 * Check if the specified song is currently being decoded.  If the
+	 * decoder is not running currently (or being started), then this
+	 * function returns false in any case.
+	 *
+	 * Caller must lock the object.
+	 */
+	gcc_pure
+	bool IsCurrentSong(const DetachedSong &_song) const;
+
+	gcc_pure
+	bool LockIsCurrentSong(const DetachedSong &_song) const {
+		Lock();
+		const bool result = IsCurrentSong(_song);
+		Unlock();
+		return result;
+	}
+
+private:
+	/**
+	 * Wait for the command to be finished by the decoder thread.
+	 *
+	 * To be called from the client thread.  Caller must lock the
+	 * object.
+	 */
+	void WaitCommandLocked() {
+		while (command != DecoderCommand::NONE)
+			WaitForDecoder();
+	}
+
+	/**
+	 * Send a command to the decoder thread and synchronously wait
+	 * for it to finish.
+	 *
+	 * To be called from the client thread.  Caller must lock the
+	 * object.
+	 */
+	void SynchronousCommandLocked(DecoderCommand cmd) {
+		command = cmd;
+		Signal();
+		WaitCommandLocked();
+	}
+
+	/**
+	 * Send a command to the decoder thread and synchronously wait
+	 * for it to finish.
+	 *
+	 * To be called from the client thread.  This method locks the
+	 * object.
+	 */
+	void LockSynchronousCommand(DecoderCommand cmd) {
+		Lock();
+		ClearError();
+		SynchronousCommandLocked(cmd);
+		Unlock();
+	}
+
+	void LockAsynchronousCommand(DecoderCommand cmd) {
+		Lock();
+		command = cmd;
+		Signal();
+		Unlock();
+	}
+
+public:
+	/**
+	 * Start the decoder.
+	 *
+	 * @param song the song to be decoded; the given instance will be
+	 * owned and freed by the decoder
+	 * @param start_time see #DecoderControl
+	 * @param end_time see #DecoderControl
+	 * @param pipe the pipe which receives the decoded chunks (owned by
+	 * the caller)
+	 */
+	void Start(DetachedSong *song, SongTime start_time, SongTime end_time,
+		   MusicBuffer &buffer, MusicPipe &pipe);
+
+	void Stop();
+
+	bool Seek(SongTime t);
+
+	void Quit();
+
+	const char *GetMixRampStart() const {
+		return mix_ramp.GetStart();
+	}
+
+	const char *GetMixRampEnd() const {
+		return mix_ramp.GetEnd();
+	}
+
+	const char *GetMixRampPreviousEnd() const {
+		return previous_mix_ramp.GetEnd();
+	}
+
+	void SetMixRamp(MixRampInfo &&new_value) {
+		mix_ramp = std::move(new_value);
+	}
+
+	/**
+	 * Move mixramp_end to mixramp_prev_end and clear
+	 * mixramp_start/mixramp_end.
+	 */
+	void CycleMixRamp();
+};
+
+#endif
diff --git a/src/decoder/DecoderError.cxx b/src/decoder/DecoderError.cxx
new file mode 100644
index 000000000..bd3842837
--- /dev/null
+++ b/src/decoder/DecoderError.cxx
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "DecoderError.hxx"
+#include "util/Domain.hxx"
+
+const Domain decoder_domain("decoder");
diff --git a/src/decoder/DecoderError.hxx b/src/decoder/DecoderError.hxx
new file mode 100644
index 000000000..83cf98204
--- /dev/null
+++ b/src/decoder/DecoderError.hxx
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_ERROR_HXX
+#define MPD_DECODER_ERROR_HXX
+
+extern const class Domain decoder_domain;
+
+#endif
diff --git a/src/decoder/DecoderInternal.cxx b/src/decoder/DecoderInternal.cxx
new file mode 100644
index 000000000..f35878682
--- /dev/null
+++ b/src/decoder/DecoderInternal.cxx
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderInternal.hxx"
+#include "DecoderControl.hxx"
+#include "pcm/PcmConvert.hxx"
+#include "MusicPipe.hxx"
+#include "MusicBuffer.hxx"
+#include "MusicChunk.hxx"
+#include "tag/Tag.hxx"
+
+#include <assert.h>
+
+Decoder::~Decoder()
+{
+	/* caller must flush the chunk */
+	assert(chunk == nullptr);
+
+	if (convert != nullptr) {
+		convert->Close();
+		delete convert;
+	}
+
+	delete song_tag;
+	delete stream_tag;
+	delete decoder_tag;
+}
+
+/**
+ * All chunks are full of decoded data; wait for the player to free
+ * one.
+ */
+static DecoderCommand
+need_chunks(DecoderControl &dc)
+{
+	if (dc.command == DecoderCommand::NONE)
+		dc.Wait();
+
+	return dc.command;
+}
+
+MusicChunk *
+Decoder::GetChunk()
+{
+	DecoderCommand cmd;
+
+	if (chunk != nullptr)
+		return chunk;
+
+	do {
+		chunk = dc.buffer->Allocate();
+		if (chunk != nullptr) {
+			chunk->replay_gain_serial = replay_gain_serial;
+			if (replay_gain_serial != 0)
+				chunk->replay_gain_info = replay_gain_info;
+
+			return chunk;
+		}
+
+		dc.Lock();
+		cmd = need_chunks(dc);
+		dc.Unlock();
+	} while (cmd == DecoderCommand::NONE);
+
+	return nullptr;
+}
+
+void
+Decoder::FlushChunk()
+{
+	assert(!seeking);
+	assert(!initial_seek_running);
+	assert(!initial_seek_pending);
+	assert(chunk != nullptr);
+
+	if (chunk->IsEmpty())
+		dc.buffer->Return(chunk);
+	else
+		dc.pipe->Push(chunk);
+
+	chunk = nullptr;
+
+	dc.Lock();
+	if (dc.client_is_waiting)
+		dc.client_cond.signal();
+	dc.Unlock();
+}
diff --git a/src/decoder/DecoderInternal.hxx b/src/decoder/DecoderInternal.hxx
new file mode 100644
index 000000000..24b665e85
--- /dev/null
+++ b/src/decoder/DecoderInternal.hxx
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_INTERNAL_HXX
+#define MPD_DECODER_INTERNAL_HXX
+
+#include "ReplayGainInfo.hxx"
+#include "util/Error.hxx"
+
+class PcmConvert;
+struct MusicChunk;
+struct DecoderControl;
+struct Tag;
+
+struct Decoder {
+	DecoderControl &dc;
+
+	/**
+	 * For converting input data to the configured audio format.
+	 * nullptr means no conversion necessary.
+	 */
+	PcmConvert *convert;
+
+	/**
+	 * The time stamp of the next data chunk, in seconds.
+	 */
+	double timestamp;
+
+	/**
+	 * Is the initial seek (to the start position of the sub-song)
+	 * pending, or has it been performed already?
+	 */
+	bool initial_seek_pending;
+
+	/**
+	 * Is the initial seek currently running?  During this time,
+	 * the decoder command is SEEK.  This flag is set by
+	 * decoder_get_virtual_command(), when the virtual SEEK
+	 * command is generated for the first time.
+	 */
+	bool initial_seek_running;
+
+	/**
+	 * This flag is set by decoder_seek_time(), and checked by
+	 * decoder_command_finished().  It is used to clean up after
+	 * seeking.
+	 */
+	bool seeking;
+
+	/**
+	 * The tag from the song object.  This is only used for local
+	 * files, because we expect the stream server to send us a new
+	 * tag each time we play it.
+	 */
+	Tag *song_tag;
+
+	/** the last tag received from the stream */
+	Tag *stream_tag;
+
+	/** the last tag received from the decoder plugin */
+	Tag *decoder_tag;
+
+	/** the chunk currently being written to */
+	MusicChunk *chunk;
+
+	ReplayGainInfo replay_gain_info;
+
+	/**
+	 * A positive serial number for checking if replay gain info
+	 * has changed since the last check.
+	 */
+	unsigned replay_gain_serial;
+
+	/**
+	 * An error has occurred (in DecoderAPI.cxx), and the plugin
+	 * will be asked to stop.
+	 */
+	Error error;
+
+	Decoder(DecoderControl &_dc, bool _initial_seek_pending, Tag *_tag)
+		:dc(_dc),
+		 convert(nullptr),
+		 timestamp(0),
+		 initial_seek_pending(_initial_seek_pending),
+		 initial_seek_running(false),
+		 seeking(false),
+		 song_tag(_tag), stream_tag(nullptr), decoder_tag(nullptr),
+		 chunk(nullptr),
+		 replay_gain_serial(0) {
+	}
+
+	~Decoder();
+
+	/**
+	 * Returns the current chunk the decoder writes to, or allocates a new
+	 * chunk if there is none.
+	 *
+	 * @return the chunk, or NULL if we have received a decoder command
+	 */
+	MusicChunk *GetChunk();
+
+	/**
+	 * Flushes the current chunk.
+	 *
+	 * Caller must not lock the #DecoderControl object.
+	 */
+	void FlushChunk();
+};
+
+#endif
diff --git a/src/decoder/DecoderList.cxx b/src/decoder/DecoderList.cxx
new file mode 100644
index 000000000..cd6881ce2
--- /dev/null
+++ b/src/decoder/DecoderList.cxx
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderList.hxx"
+#include "DecoderPlugin.hxx"
+#include "config/ConfigGlobal.hxx"
+#include "config/ConfigData.hxx"
+#include "plugins/AudiofileDecoderPlugin.hxx"
+#include "plugins/PcmDecoderPlugin.hxx"
+#include "plugins/DsdiffDecoderPlugin.hxx"
+#include "plugins/DsfDecoderPlugin.hxx"
+#include "plugins/FlacDecoderPlugin.h"
+#include "plugins/OpusDecoderPlugin.h"
+#include "plugins/VorbisDecoderPlugin.h"
+#include "plugins/AdPlugDecoderPlugin.h"
+#include "plugins/WavpackDecoderPlugin.hxx"
+#include "plugins/FfmpegDecoderPlugin.hxx"
+#include "plugins/GmeDecoderPlugin.hxx"
+#include "plugins/FaadDecoderPlugin.hxx"
+#include "plugins/MadDecoderPlugin.hxx"
+#include "plugins/SndfileDecoderPlugin.hxx"
+#include "plugins/Mpg123DecoderPlugin.hxx"
+#include "plugins/WildmidiDecoderPlugin.hxx"
+#include "plugins/MikmodDecoderPlugin.hxx"
+#include "plugins/ModplugDecoderPlugin.hxx"
+#include "plugins/MpcdecDecoderPlugin.hxx"
+#include "plugins/FluidsynthDecoderPlugin.hxx"
+#include "plugins/SidplayDecoderPlugin.hxx"
+#include "util/Macros.hxx"
+
+#include <string.h>
+
+const struct DecoderPlugin *const decoder_plugins[] = {
+#ifdef HAVE_MAD
+	&mad_decoder_plugin,
+#endif
+#ifdef HAVE_MPG123
+	&mpg123_decoder_plugin,
+#endif
+#ifdef ENABLE_VORBIS_DECODER
+	&vorbis_decoder_plugin,
+#endif
+#if defined(HAVE_FLAC)
+	&oggflac_decoder_plugin,
+#endif
+#ifdef HAVE_FLAC
+	&flac_decoder_plugin,
+#endif
+#ifdef HAVE_OPUS
+	&opus_decoder_plugin,
+#endif
+#ifdef ENABLE_SNDFILE
+	&sndfile_decoder_plugin,
+#endif
+#ifdef HAVE_AUDIOFILE
+	&audiofile_decoder_plugin,
+#endif
+#ifdef ENABLE_DSD
+	&dsdiff_decoder_plugin,
+	&dsf_decoder_plugin,
+#endif
+#ifdef HAVE_FAAD
+	&faad_decoder_plugin,
+#endif
+#ifdef HAVE_MPCDEC
+	&mpcdec_decoder_plugin,
+#endif
+#ifdef HAVE_WAVPACK
+	&wavpack_decoder_plugin,
+#endif
+#ifdef HAVE_MODPLUG
+	&modplug_decoder_plugin,
+#endif
+#ifdef ENABLE_MIKMOD_DECODER
+	&mikmod_decoder_plugin,
+#endif
+#ifdef ENABLE_SIDPLAY
+	&sidplay_decoder_plugin,
+#endif
+#ifdef ENABLE_WILDMIDI
+	&wildmidi_decoder_plugin,
+#endif
+#ifdef ENABLE_FLUIDSYNTH
+	&fluidsynth_decoder_plugin,
+#endif
+#ifdef HAVE_ADPLUG
+	&adplug_decoder_plugin,
+#endif
+#ifdef HAVE_FFMPEG
+	&ffmpeg_decoder_plugin,
+#endif
+#ifdef HAVE_GME
+	&gme_decoder_plugin,
+#endif
+	&pcm_decoder_plugin,
+	nullptr
+};
+
+static constexpr unsigned num_decoder_plugins =
+	ARRAY_SIZE(decoder_plugins) - 1;
+
+/** which plugins have been initialized successfully? */
+bool decoder_plugins_enabled[num_decoder_plugins];
+
+const struct DecoderPlugin *
+decoder_plugin_from_name(const char *name)
+{
+	return decoder_plugins_find([=](const DecoderPlugin &plugin){
+			return strcmp(plugin.name, name) == 0;
+		});
+}
+
+void decoder_plugin_init_all(void)
+{
+	struct config_param empty;
+
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i) {
+		const DecoderPlugin &plugin = *decoder_plugins[i];
+		const struct config_param *param =
+			config_find_block(CONF_DECODER, "plugin", plugin.name);
+
+		if (param == nullptr)
+			param = &empty;
+		else if (!param->GetBlockValue("enabled", true))
+			/* the plugin is disabled in mpd.conf */
+			continue;
+
+		if (plugin.Init(*param))
+			decoder_plugins_enabled[i] = true;
+	}
+}
+
+void decoder_plugin_deinit_all(void)
+{
+	decoder_plugins_for_each_enabled([=](const DecoderPlugin &plugin){
+			plugin.Finish();
+		});
+}
+
+bool
+decoder_plugins_supports_suffix(const char *suffix)
+{
+	return decoder_plugins_try([suffix](const DecoderPlugin &plugin){
+			return plugin.SupportsSuffix(suffix);
+		});
+}
diff --git a/src/decoder/DecoderList.hxx b/src/decoder/DecoderList.hxx
new file mode 100644
index 000000000..47085d4ae
--- /dev/null
+++ b/src/decoder/DecoderList.hxx
@@ -0,0 +1,89 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_LIST_HXX
+#define MPD_DECODER_LIST_HXX
+
+#include "Compiler.h"
+
+struct DecoderPlugin;
+
+extern const struct DecoderPlugin *const decoder_plugins[];
+extern bool decoder_plugins_enabled[];
+
+/* interface for using plugins */
+
+gcc_pure
+const struct DecoderPlugin *
+decoder_plugin_from_name(const char *name);
+
+/* this is where we "load" all the "plugins" ;-) */
+void decoder_plugin_init_all(void);
+
+/* this is where we "unload" all the "plugins" */
+void decoder_plugin_deinit_all(void);
+
+template<typename F>
+static inline const DecoderPlugin *
+decoder_plugins_find(F f)
+{
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i)
+		if (decoder_plugins_enabled[i] && f(*decoder_plugins[i]))
+			return decoder_plugins[i];
+
+	return nullptr;
+}
+
+template<typename F>
+static inline bool
+decoder_plugins_try(F f)
+{
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i)
+		if (decoder_plugins_enabled[i] && f(*decoder_plugins[i]))
+			return true;
+
+	return false;
+}
+
+template<typename F>
+static inline void
+decoder_plugins_for_each(F f)
+{
+	for (auto i = decoder_plugins; *i != nullptr; ++i)
+		f(**i);
+}
+
+template<typename F>
+static inline void
+decoder_plugins_for_each_enabled(F f)
+{
+	for (unsigned i = 0; decoder_plugins[i] != nullptr; ++i)
+		if (decoder_plugins_enabled[i])
+			f(*decoder_plugins[i]);
+}
+
+/**
+ * Is there at least once #DecoderPlugin that supports the specified
+ * file name suffix?
+ */
+gcc_pure gcc_nonnull_all
+bool
+decoder_plugins_supports_suffix(const char *suffix);
+
+#endif
diff --git a/src/decoder/DecoderPlugin.cxx b/src/decoder/DecoderPlugin.cxx
new file mode 100644
index 000000000..a0722c348
--- /dev/null
+++ b/src/decoder/DecoderPlugin.cxx
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderPlugin.hxx"
+#include "util/StringUtil.hxx"
+
+#include <assert.h>
+
+bool
+DecoderPlugin::SupportsSuffix(const char *suffix) const
+{
+#if !CLANG_CHECK_VERSION(3,6)
+	/* disabled on clang due to -Wtautological-pointer-compare */
+	assert(suffix != nullptr);
+#endif
+
+	return suffixes != nullptr && string_array_contains(suffixes, suffix);
+
+}
+
+bool
+DecoderPlugin::SupportsMimeType(const char *mime_type) const
+{
+#if !CLANG_CHECK_VERSION(3,6)
+	/* disabled on clang due to -Wtautological-pointer-compare */
+	assert(mime_type != nullptr);
+#endif
+
+	return mime_types != nullptr &&
+		string_array_contains(mime_types, mime_type);
+}
diff --git a/src/decoder/DecoderPlugin.hxx b/src/decoder/DecoderPlugin.hxx
new file mode 100644
index 000000000..dbf3db9aa
--- /dev/null
+++ b/src/decoder/DecoderPlugin.hxx
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_PLUGIN_HXX
+#define MPD_DECODER_PLUGIN_HXX
+
+#include "Compiler.h"
+
+struct config_param;
+class InputStream;
+struct tag_handler;
+class Path;
+
+/**
+ * Opaque handle which the decoder plugin passes to the functions in
+ * this header.
+ */
+struct Decoder;
+
+struct DecoderPlugin {
+	const char *name;
+
+	/**
+	 * Initialize the decoder plugin.  Optional method.
+	 *
+	 * @param param a configuration block for this plugin, or nullptr
+	 * if none is configured
+	 * @return true if the plugin was initialized successfully,
+	 * false if the plugin is not available
+	 */
+	bool (*init)(const config_param &param);
+
+	/**
+	 * Deinitialize a decoder plugin which was initialized
+	 * successfully.  Optional method.
+	 */
+	void (*finish)(void);
+
+	/**
+	 * Decode a stream (data read from an #input_stream object).
+	 *
+	 * Either implement this method or file_decode().  If
+	 * possible, it is recommended to implement this method,
+	 * because it is more versatile.
+	 */
+	void (*stream_decode)(Decoder &decoder, InputStream &is);
+
+	/**
+	 * Decode a local file.
+	 *
+	 * Either implement this method or stream_decode().
+	 */
+	void (*file_decode)(Decoder &decoder, Path path_fs);
+
+	/**
+	 * Scan metadata of a file.
+	 *
+	 * @return false if the operation has failed
+	 */
+	bool (*scan_file)(Path path_fs,
+			  const struct tag_handler *handler,
+			  void *handler_ctx);
+
+	/**
+	 * Scan metadata of a file.
+	 *
+	 * @return false if the operation has failed
+	 */
+	bool (*scan_stream)(InputStream &is,
+			    const struct tag_handler *handler,
+			    void *handler_ctx);
+
+	/**
+	 * @brief Return a "virtual" filename for subtracks in
+	 * container formats like flac
+	 * @param const char* pathname full pathname for the file on fs
+	 * @param const unsigned int tnum track number
+	 *
+	 * @return nullptr if there are no multiple files
+	 * a filename for every single track according to tnum (param 2)
+	 * do not include full pathname here, just the "virtual" file
+	 *
+	 * Free the return value with delete[].
+	 */
+	char* (*container_scan)(Path path_fs, const unsigned int tnum);
+
+	/* last element in these arrays must always be a nullptr: */
+	const char *const*suffixes;
+	const char *const*mime_types;
+
+	/**
+	 * Initialize a decoder plugin.
+	 *
+	 * @param param a configuration block for this plugin, or nullptr if none
+	 * is configured
+	 * @return true if the plugin was initialized successfully, false if
+	 * the plugin is not available
+	 */
+	bool Init(const config_param &param) const {
+		return init != nullptr
+			? init(param)
+			: true;
+	}
+
+	/**
+	 * Deinitialize a decoder plugin which was initialized successfully.
+	 */
+	void Finish() const {
+		if (finish != nullptr)
+			finish();
+	}
+
+	/**
+	 * Decode a stream.
+	 */
+	void StreamDecode(Decoder &decoder, InputStream &is) const {
+		stream_decode(decoder, is);
+	}
+
+	/**
+	 * Decode a file.
+	 */
+	template<typename P>
+	void FileDecode(Decoder &decoder, P path_fs) const {
+		file_decode(decoder, path_fs);
+	}
+
+	/**
+	 * Read the tag of a file.
+	 */
+	template<typename P>
+	bool ScanFile(P path_fs,
+		      const tag_handler &handler, void *handler_ctx) const {
+		return scan_file != nullptr
+			? scan_file(path_fs, &handler, handler_ctx)
+			: false;
+	}
+
+	/**
+	 * Read the tag of a stream.
+	 */
+	bool ScanStream(InputStream &is,
+			const tag_handler &handler, void *handler_ctx) const {
+		return scan_stream != nullptr
+			? scan_stream(is, &handler, handler_ctx)
+			: false;
+	}
+
+	/**
+	 * return "virtual" tracks in a container
+	 */
+	template<typename P>
+	char *ContainerScan(P path, const unsigned int tnum) const {
+		return container_scan(path, tnum);
+	}
+
+	/**
+	 * Does the plugin announce the specified file name suffix?
+	 */
+	gcc_pure gcc_nonnull_all
+	bool SupportsSuffix(const char *suffix) const;
+
+	/**
+	 * Does the plugin announce the specified MIME type?
+	 */
+	gcc_pure gcc_nonnull_all
+	bool SupportsMimeType(const char *mime_type) const;
+};
+
+#endif
diff --git a/src/decoder/DecoderPrint.cxx b/src/decoder/DecoderPrint.cxx
new file mode 100644
index 000000000..54b89c36c
--- /dev/null
+++ b/src/decoder/DecoderPrint.cxx
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderPrint.hxx"
+#include "DecoderList.hxx"
+#include "DecoderPlugin.hxx"
+#include "client/Client.hxx"
+
+#include <functional>
+
+#include <assert.h>
+
+static void
+decoder_plugin_print(Client &client,
+		     const DecoderPlugin &plugin)
+{
+	const char *const*p;
+
+	assert(plugin.name != nullptr);
+
+	client_printf(client, "plugin: %s\n", plugin.name);
+
+	if (plugin.suffixes != nullptr)
+		for (p = plugin.suffixes; *p != nullptr; ++p)
+			client_printf(client, "suffix: %s\n", *p);
+
+	if (plugin.mime_types != nullptr)
+		for (p = plugin.mime_types; *p != nullptr; ++p)
+			client_printf(client, "mime_type: %s\n", *p);
+}
+
+void
+decoder_list_print(Client &client)
+{
+	using namespace std::placeholders;
+	const auto f = std::bind(decoder_plugin_print, std::ref(client), _1);
+	decoder_plugins_for_each_enabled(f);
+}
diff --git a/src/decoder/DecoderPrint.hxx b/src/decoder/DecoderPrint.hxx
new file mode 100644
index 000000000..695bd099d
--- /dev/null
+++ b/src/decoder/DecoderPrint.hxx
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_PRINT_HXX
+#define MPD_DECODER_PRINT_HXX
+
+class Client;
+
+void
+decoder_list_print(Client &client);
+
+#endif
diff --git a/src/decoder/DecoderThread.cxx b/src/decoder/DecoderThread.cxx
new file mode 100644
index 000000000..dd5518b98
--- /dev/null
+++ b/src/decoder/DecoderThread.cxx
@@ -0,0 +1,509 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "DecoderThread.hxx"
+#include "DecoderControl.hxx"
+#include "DecoderInternal.hxx"
+#include "DecoderError.hxx"
+#include "DecoderPlugin.hxx"
+#include "DetachedSong.hxx"
+#include "system/FatalError.hxx"
+#include "MusicPipe.hxx"
+#include "fs/Traits.hxx"
+#include "fs/AllocatedPath.hxx"
+#include "DecoderAPI.hxx"
+#include "input/InputStream.hxx"
+#include "input/LocalOpen.hxx"
+#include "DecoderList.hxx"
+#include "util/UriUtil.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+#include "thread/Name.hxx"
+#include "tag/ApeReplayGain.hxx"
+#include "Log.hxx"
+
+#include <functional>
+
+static constexpr Domain decoder_thread_domain("decoder_thread");
+
+/**
+ * Marks the current decoder command as "finished" and notifies the
+ * player thread.
+ *
+ * @param dc the #DecoderControl object; must be locked
+ */
+static void
+decoder_command_finished_locked(DecoderControl &dc)
+{
+	assert(dc.command != DecoderCommand::NONE);
+
+	dc.command = DecoderCommand::NONE;
+
+	dc.client_cond.signal();
+}
+
+/**
+ * Opens the input stream with input_stream::Open(), and waits until
+ * the stream gets ready.  If a decoder STOP command is received
+ * during that, it cancels the operation (but does not close the
+ * stream).
+ *
+ * Unlock the decoder before calling this function.
+ *
+ * @return an input_stream on success or if #DecoderCommand::STOP is
+ * received, nullptr on error
+ */
+static InputStream *
+decoder_input_stream_open(DecoderControl &dc, const char *uri)
+{
+	Error error;
+
+	InputStream *is = InputStream::Open(uri, dc.mutex, dc.cond, error);
+	if (is == nullptr) {
+		if (error.IsDefined())
+			LogError(error);
+
+		return nullptr;
+	}
+
+	/* wait for the input stream to become ready; its metadata
+	   will be available then */
+
+	dc.Lock();
+
+	is->Update();
+	while (!is->IsReady() &&
+	       dc.command != DecoderCommand::STOP) {
+		dc.Wait();
+
+		is->Update();
+	}
+
+	if (!is->Check(error)) {
+		dc.Unlock();
+
+		LogError(error);
+		return nullptr;
+	}
+
+	dc.Unlock();
+
+	return is;
+}
+
+static InputStream *
+decoder_input_stream_open(DecoderControl &dc, Path path)
+{
+	Error error;
+
+	InputStream *is = OpenLocalInputStream(path, dc.mutex, dc.cond, error);
+	if (is == nullptr) {
+		LogError(error);
+		return nullptr;
+	}
+
+	assert(is->IsReady());
+
+	return is;
+}
+
+static bool
+decoder_stream_decode(const DecoderPlugin &plugin,
+		      Decoder &decoder,
+		      InputStream &input_stream)
+{
+	assert(plugin.stream_decode != nullptr);
+	assert(decoder.stream_tag == nullptr);
+	assert(decoder.decoder_tag == nullptr);
+	assert(input_stream.IsReady());
+	assert(decoder.dc.state == DecoderState::START);
+
+	FormatDebug(decoder_thread_domain, "probing plugin %s", plugin.name);
+
+	if (decoder.dc.command == DecoderCommand::STOP)
+		return true;
+
+	/* rewind the stream, so each plugin gets a fresh start */
+	input_stream.Rewind(IgnoreError());
+
+	decoder.dc.Unlock();
+
+	FormatThreadName("decoder:%s", plugin.name);
+
+	plugin.StreamDecode(decoder, input_stream);
+
+	SetThreadName("decoder");
+
+	decoder.dc.Lock();
+
+	assert(decoder.dc.state == DecoderState::START ||
+	       decoder.dc.state == DecoderState::DECODE);
+
+	return decoder.dc.state != DecoderState::START;
+}
+
+static bool
+decoder_file_decode(const DecoderPlugin &plugin,
+		    Decoder &decoder, Path path)
+{
+	assert(plugin.file_decode != nullptr);
+	assert(decoder.stream_tag == nullptr);
+	assert(decoder.decoder_tag == nullptr);
+	assert(!path.IsNull());
+	assert(path.IsAbsolute());
+	assert(decoder.dc.state == DecoderState::START);
+
+	FormatDebug(decoder_thread_domain, "probing plugin %s", plugin.name);
+
+	if (decoder.dc.command == DecoderCommand::STOP)
+		return true;
+
+	decoder.dc.Unlock();
+
+	FormatThreadName("decoder:%s", plugin.name);
+
+	plugin.FileDecode(decoder, path);
+
+	SetThreadName("decoder");
+
+	decoder.dc.Lock();
+
+	assert(decoder.dc.state == DecoderState::START ||
+	       decoder.dc.state == DecoderState::DECODE);
+
+	return decoder.dc.state != DecoderState::START;
+}
+
+gcc_pure
+static bool
+decoder_check_plugin_mime(const DecoderPlugin &plugin, const InputStream &is)
+{
+	assert(plugin.stream_decode != nullptr);
+
+	const char *mime_type = is.GetMimeType();
+	return mime_type != nullptr && plugin.SupportsMimeType(mime_type);
+}
+
+gcc_pure
+static bool
+decoder_check_plugin_suffix(const DecoderPlugin &plugin, const char *suffix)
+{
+	assert(plugin.stream_decode != nullptr);
+
+	return suffix != nullptr && plugin.SupportsSuffix(suffix);
+}
+
+gcc_pure
+static bool
+decoder_check_plugin(const DecoderPlugin &plugin, const InputStream &is,
+		     const char *suffix)
+{
+	return plugin.stream_decode != nullptr &&
+		(decoder_check_plugin_mime(plugin, is) ||
+		 decoder_check_plugin_suffix(plugin, suffix));
+}
+
+static bool
+decoder_run_stream_plugin(Decoder &decoder, InputStream &is,
+			  const char *suffix,
+			  const DecoderPlugin &plugin,
+			  bool &tried_r)
+{
+	if (!decoder_check_plugin(plugin, is, suffix))
+		return false;
+
+	tried_r = true;
+	return decoder_stream_decode(plugin, decoder, is);
+}
+
+static bool
+decoder_run_stream_locked(Decoder &decoder, InputStream &is,
+			  const char *uri, bool &tried_r)
+{
+	UriSuffixBuffer suffix_buffer;
+	const char *const suffix = uri_get_suffix(uri, suffix_buffer);
+
+	using namespace std::placeholders;
+	const auto f = std::bind(decoder_run_stream_plugin,
+				 std::ref(decoder), std::ref(is), suffix,
+				 _1, std::ref(tried_r));
+	return decoder_plugins_try(f);
+}
+
+/**
+ * Try decoding a stream, using the fallback plugin.
+ */
+static bool
+decoder_run_stream_fallback(Decoder &decoder, InputStream &is)
+{
+	const struct DecoderPlugin *plugin;
+
+	plugin = decoder_plugin_from_name("mad");
+	return plugin != nullptr && plugin->stream_decode != nullptr &&
+		decoder_stream_decode(*plugin, decoder, is);
+}
+
+/**
+ * Try decoding a stream.
+ */
+static bool
+decoder_run_stream(Decoder &decoder, const char *uri)
+{
+	DecoderControl &dc = decoder.dc;
+	InputStream *input_stream;
+	bool success;
+
+	dc.Unlock();
+
+	input_stream = decoder_input_stream_open(dc, uri);
+	if (input_stream == nullptr) {
+		dc.Lock();
+		return false;
+	}
+
+	dc.Lock();
+
+	bool tried = false;
+	success = dc.command == DecoderCommand::STOP ||
+		decoder_run_stream_locked(decoder, *input_stream, uri,
+					  tried) ||
+		/* fallback to mp3: this is needed for bastard streams
+		   that don't have a suffix or set the mimeType */
+		(!tried &&
+		 decoder_run_stream_fallback(decoder, *input_stream));
+
+	dc.Unlock();
+	delete input_stream;
+	dc.Lock();
+
+	return success;
+}
+
+/**
+ * Attempt to load replay gain data, and pass it to
+ * decoder_replay_gain().
+ */
+static void
+decoder_load_replay_gain(Decoder &decoder, Path path_fs)
+{
+	ReplayGainInfo info;
+	if (replay_gain_ape_read(path_fs, info))
+		decoder_replay_gain(decoder, &info);
+}
+
+static bool
+TryDecoderFile(Decoder &decoder, Path path_fs, const char *suffix,
+	       const DecoderPlugin &plugin)
+{
+	if (!plugin.SupportsSuffix(suffix))
+		return false;
+
+	DecoderControl &dc = decoder.dc;
+
+	if (plugin.file_decode != nullptr) {
+		dc.Lock();
+
+		if (decoder_file_decode(plugin, decoder, path_fs))
+			return true;
+
+		dc.Unlock();
+	} else if (plugin.stream_decode != nullptr) {
+		InputStream *input_stream =
+			decoder_input_stream_open(dc, path_fs);
+		if (input_stream == nullptr)
+			return false;
+
+		dc.Lock();
+
+		bool success = decoder_stream_decode(plugin, decoder,
+						     *input_stream);
+
+		dc.Unlock();
+
+		delete input_stream;
+
+		if (success) {
+			dc.Lock();
+			return true;
+		}
+	}
+
+	return false;
+}
+
+/**
+ * Try decoding a file.
+ */
+static bool
+decoder_run_file(Decoder &decoder, const char *uri_utf8, Path path_fs)
+{
+	const char *suffix = uri_get_suffix(uri_utf8);
+	if (suffix == nullptr)
+		return false;
+
+	DecoderControl &dc = decoder.dc;
+	dc.Unlock();
+
+	decoder_load_replay_gain(decoder, path_fs);
+
+	if (decoder_plugins_try([&decoder, path_fs,
+				 suffix](const DecoderPlugin &plugin){
+				return TryDecoderFile(decoder,
+						      path_fs, suffix,
+						      plugin);
+			}))
+		return true;
+
+	dc.Lock();
+	return false;
+}
+
+static void
+decoder_run_song(DecoderControl &dc,
+		 const DetachedSong &song, const char *uri, Path path_fs)
+{
+	Decoder decoder(dc, dc.start_time.IsPositive(),
+			new Tag(song.GetTag()));
+	int ret;
+
+	dc.state = DecoderState::START;
+
+	decoder_command_finished_locked(dc);
+
+	ret = !path_fs.IsNull()
+		? decoder_run_file(decoder, uri, path_fs)
+		: decoder_run_stream(decoder, uri);
+
+	dc.Unlock();
+
+	/* flush the last chunk */
+
+	if (decoder.chunk != nullptr)
+		decoder.FlushChunk();
+
+	dc.Lock();
+
+	if (decoder.error.IsDefined()) {
+		/* copy the Error from sruct Decoder to
+		   DecoderControl */
+		dc.state = DecoderState::ERROR;
+		dc.error = std::move(decoder.error);
+	} else if (ret)
+		dc.state = DecoderState::STOP;
+	else {
+		dc.state = DecoderState::ERROR;
+
+		const char *error_uri = song.GetURI();
+		const std::string allocated = uri_remove_auth(error_uri);
+		if (!allocated.empty())
+			error_uri = allocated.c_str();
+
+		dc.error.Format(decoder_domain,
+				 "Failed to decode %s", error_uri);
+	}
+
+	dc.client_cond.signal();
+}
+
+static void
+decoder_run(DecoderControl &dc)
+{
+	dc.ClearError();
+
+	assert(dc.song != nullptr);
+	const DetachedSong &song = *dc.song;
+
+	const char *const uri_utf8 = song.GetRealURI();
+
+	Path path_fs = Path::Null();
+	AllocatedPath path_buffer = AllocatedPath::Null();
+	if (PathTraitsUTF8::IsAbsolute(uri_utf8)) {
+		path_buffer = AllocatedPath::FromUTF8(uri_utf8, dc.error);
+		if (path_buffer.IsNull()) {
+			dc.state = DecoderState::ERROR;
+			decoder_command_finished_locked(dc);
+			return;
+		}
+
+		path_fs = path_buffer;
+	}
+
+	decoder_run_song(dc, song, uri_utf8, path_fs);
+
+}
+
+static void
+decoder_task(void *arg)
+{
+	DecoderControl &dc = *(DecoderControl *)arg;
+
+	SetThreadName("decoder");
+
+	dc.Lock();
+
+	do {
+		assert(dc.state == DecoderState::STOP ||
+		       dc.state == DecoderState::ERROR);
+
+		switch (dc.command) {
+		case DecoderCommand::START:
+			dc.CycleMixRamp();
+			dc.replay_gain_prev_db = dc.replay_gain_db;
+			dc.replay_gain_db = 0;
+
+			decoder_run(dc);
+			break;
+
+		case DecoderCommand::SEEK:
+			/* this seek was too late, and the decoder had
+			   already finished; start a new decoder */
+
+			/* we need to clear the pipe here; usually the
+			   PlayerThread is responsible, but it is not
+			   aware that the decoder has finished */
+			dc.pipe->Clear(*dc.buffer);
+
+			decoder_run(dc);
+			break;
+
+		case DecoderCommand::STOP:
+			decoder_command_finished_locked(dc);
+			break;
+
+		case DecoderCommand::NONE:
+			dc.Wait();
+			break;
+		}
+	} while (dc.command != DecoderCommand::NONE || !dc.quit);
+
+	dc.Unlock();
+}
+
+void
+decoder_thread_start(DecoderControl &dc)
+{
+	assert(!dc.thread.IsDefined());
+
+	dc.quit = false;
+
+	Error error;
+	if (!dc.thread.Start(decoder_task, &dc, error))
+		FatalError(error);
+}
diff --git a/src/decoder/DecoderThread.hxx b/src/decoder/DecoderThread.hxx
new file mode 100644
index 000000000..d5fde281c
--- /dev/null
+++ b/src/decoder/DecoderThread.hxx
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_DECODER_THREAD_HXX
+#define MPD_DECODER_THREAD_HXX
+
+struct DecoderControl;
+
+void
+decoder_thread_start(DecoderControl &dc);
+
+#endif
diff --git a/src/decoder/AdPlugDecoderPlugin.cxx b/src/decoder/plugins/AdPlugDecoderPlugin.cxx
index c79fca5f9..9cc37ade4 100644
--- a/src/decoder/AdPlugDecoderPlugin.cxx
+++ b/src/decoder/plugins/AdPlugDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,9 +20,11 @@
 #include "config.h"
 #include "AdPlugDecoderPlugin.h"
 #include "tag/TagHandler.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "CheckAudioFormat.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
+#include "util/Domain.hxx"
 #include "util/Macros.hxx"
 #include "Log.hxx"
 
@@ -31,11 +33,16 @@
 
 #include <assert.h>
 
+static constexpr Domain adplug_domain("adplug");
+
 static unsigned sample_rate;
 
 static bool
 adplug_init(const config_param &param)
 {
+	FormatDebug(adplug_domain, "adplug %s",
+		    CAdPlug::get_version().c_str());
+
 	Error error;
 
 	sample_rate = param.GetBlockValue("sample_rate", 48000u);
@@ -48,12 +55,12 @@ adplug_init(const config_param &param)
 }
 
 static void
-adplug_file_decode(Decoder &decoder, const char *path_fs)
+adplug_file_decode(Decoder &decoder, Path path_fs)
 {
 	CEmuopl opl(sample_rate, true, true);
 	opl.init();
 
-	CPlayer *player = CAdPlug::factory(path_fs, &opl);
+	CPlayer *player = CAdPlug::factory(path_fs.c_str(), &opl);
 	if (player == nullptr)
 		return;
 
@@ -61,16 +68,16 @@ adplug_file_decode(Decoder &decoder, const char *path_fs)
 	assert(audio_format.IsValid());
 
 	decoder_initialized(decoder, audio_format, false,
-		player->songlength() / 1000.);
+			    SongTime::FromMS(player->songlength()));
 
-	int16_t buffer[2048];
-	const unsigned frames_per_buffer = ARRAY_SIZE(buffer) / 2;
 	DecoderCommand cmd;
 
 	do {
 		if (!player->update())
 			break;
 
+		int16_t buffer[2048];
+		constexpr unsigned frames_per_buffer = ARRAY_SIZE(buffer) / 2;
 		opl.update(buffer, frames_per_buffer);
 		cmd = decoder_data(decoder, nullptr,
 				   buffer, sizeof(buffer),
@@ -90,18 +97,18 @@ adplug_scan_tag(TagType type, const std::string &value,
 }
 
 static bool
-adplug_scan_file(const char *path_fs,
+adplug_scan_file(Path path_fs,
 		 const struct tag_handler *handler, void *handler_ctx)
 {
 	CEmuopl opl(sample_rate, true, true);
 	opl.init();
 
-	CPlayer *player = CAdPlug::factory(path_fs, &opl);
+	CPlayer *player = CAdPlug::factory(path_fs.c_str(), &opl);
 	if (player == nullptr)
 		return false;
 
 	tag_handler_invoke_duration(handler, handler_ctx,
-				    player->songlength() / 1000);
+				    SongTime::FromMS(player->songlength()));
 
 	if (handler->tag != nullptr) {
 		adplug_scan_tag(TAG_TITLE, player->gettitle(),
diff --git a/src/decoder/AdPlugDecoderPlugin.h b/src/decoder/plugins/AdPlugDecoderPlugin.h
index a827fdc7d..539dbbf0a 100644
--- a/src/decoder/AdPlugDecoderPlugin.h
+++ b/src/decoder/plugins/AdPlugDecoderPlugin.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/AudiofileDecoderPlugin.cxx b/src/decoder/plugins/AudiofileDecoderPlugin.cxx
index b1b8bf613..a0ef71e49 100644
--- a/src/decoder/AudiofileDecoderPlugin.cxx
+++ b/src/decoder/plugins/AudiofileDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,10 +19,11 @@
 
 #include "config.h"
 #include "AudiofileDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
@@ -33,11 +34,21 @@
 #include <assert.h>
 #include <stdio.h>
 
-/* pick 1020 since its devisible for 8,16,24, and 32-bit audio */
-#define CHUNK_SIZE		1020
-
 static constexpr Domain audiofile_domain("audiofile");
 
+static void
+audiofile_error_func(long, const char *msg)
+{
+	LogWarning(audiofile_domain, msg);
+}
+
+static bool
+audiofile_init(const config_param &)
+{
+	afSetErrorHandler(audiofile_error_func);
+	return true;
+}
+
 struct AudioFileInputStream {
 	Decoder *const decoder;
 	InputStream &is;
@@ -52,18 +63,12 @@ struct AudioFileInputStream {
 	}
 };
 
-static int audiofile_get_duration(const char *file)
+gcc_pure
+static SongTime
+audiofile_get_duration(AFfilehandle fh)
 {
-	int total_time;
-	AFfilehandle af_fp = afOpenFile(file, "r", nullptr);
-	if (af_fp == AF_NULL_FILEHANDLE) {
-		return -1;
-	}
-	total_time = (int)
-	    ((double)afGetFrameCount(af_fp, AF_DEFAULT_TRACK)
-	     / afGetRate(af_fp, AF_DEFAULT_TRACK));
-	afCloseFile(af_fp);
-	return total_time;
+	return SongTime::FromScale<uint64_t>(afGetFrameCount(fh, AF_DEFAULT_TRACK),
+					     afGetRate(fh, AF_DEFAULT_TRACK));
 }
 
 static ssize_t
@@ -101,15 +106,18 @@ audiofile_file_destroy(AFvirtualfile *vfile)
 }
 
 static AFfileoffset
-audiofile_file_seek(AFvirtualfile *vfile, AFfileoffset offset, int is_relative)
+audiofile_file_seek(AFvirtualfile *vfile, AFfileoffset _offset,
+		    int is_relative)
 {
 	AudioFileInputStream &afis = *(AudioFileInputStream *)vfile->closure;
 	InputStream &is = afis.is;
 
-	int whence = (is_relative ? SEEK_CUR : SEEK_SET);
+	offset_type offset = _offset;
+	if (is_relative)
+		offset += is.GetOffset();
 
 	Error error;
-	if (is.LockSeek(offset, whence, error)) {
+	if (is.LockSeek(offset, error)) {
 		return is.GetOffset();
 	} else {
 		LogError(error, "Seek failed");
@@ -165,7 +173,7 @@ audiofile_setup_sample_format(AFfilehandle af_fp)
 	}
 
 	afSetVirtualSampleFormat(af_fp, AF_DEFAULT_TRACK,
-	                         AF_SAMPFMT_TWOSCOMP, bits);
+				 AF_SAMPFMT_TWOSCOMP, bits);
 	afGetVirtualSampleFormat(af_fp, AF_DEFAULT_TRACK, &fs, &bits);
 
 	return audiofile_bits_to_sample_format(bits);
@@ -174,88 +182,94 @@ audiofile_setup_sample_format(AFfilehandle af_fp)
 static void
 audiofile_stream_decode(Decoder &decoder, InputStream &is)
 {
-	AFvirtualfile *vf;
-	int fs, frame_count;
-	AFfilehandle af_fp;
-	AudioFormat audio_format;
-	float total_time;
-	uint16_t bit_rate;
-	int ret;
-	char chunk[CHUNK_SIZE];
-
-	if (!is.IsSeekable()) {
+	if (!is.IsSeekable() || !is.KnownSize()) {
 		LogWarning(audiofile_domain, "not seekable");
 		return;
 	}
 
 	AudioFileInputStream afis{&decoder, is};
-	vf = setup_virtual_fops(afis);
+	AFvirtualfile *const vf = setup_virtual_fops(afis);
 
-	af_fp = afOpenVirtualFile(vf, "r", nullptr);
-	if (af_fp == AF_NULL_FILEHANDLE) {
-		LogWarning(audiofile_domain, "failed to input stream");
+	const AFfilehandle fh = afOpenVirtualFile(vf, "r", nullptr);
+	if (fh == AF_NULL_FILEHANDLE)
 		return;
-	}
 
 	Error error;
+	AudioFormat audio_format;
 	if (!audio_format_init_checked(audio_format,
-				       afGetRate(af_fp, AF_DEFAULT_TRACK),
-				       audiofile_setup_sample_format(af_fp),
-				       afGetVirtualChannels(af_fp, AF_DEFAULT_TRACK),
+				       afGetRate(fh, AF_DEFAULT_TRACK),
+				       audiofile_setup_sample_format(fh),
+				       afGetVirtualChannels(fh, AF_DEFAULT_TRACK),
 				       error)) {
 		LogError(error);
-		afCloseFile(af_fp);
+		afCloseFile(fh);
 		return;
 	}
 
-	frame_count = afGetFrameCount(af_fp, AF_DEFAULT_TRACK);
-
-	total_time = ((float)frame_count / (float)audio_format.sample_rate);
+	const auto total_time = audiofile_get_duration(fh);
 
-	bit_rate = (uint16_t)(is.GetSize() * 8.0 / total_time / 1000.0 + 0.5);
+	const uint16_t kbit_rate = (uint16_t)
+		(is.GetSize() * uint64_t(8) / total_time.ToMS());
 
-	fs = (int)afGetVirtualFrameSize(af_fp, AF_DEFAULT_TRACK, 1);
+	const unsigned frame_size = (unsigned)
+		afGetVirtualFrameSize(fh, AF_DEFAULT_TRACK, true);
 
 	decoder_initialized(decoder, audio_format, true, total_time);
 
 	DecoderCommand cmd;
 	do {
-		ret = afReadFrames(af_fp, AF_DEFAULT_TRACK, chunk,
-				   CHUNK_SIZE / fs);
-		if (ret <= 0)
+		/* pick 1020 since its divisible for 8,16,24, and
+		   32-bit audio */
+		char chunk[1020];
+		const int nframes =
+			afReadFrames(fh, AF_DEFAULT_TRACK, chunk,
+				     sizeof(chunk) / frame_size);
+		if (nframes <= 0)
 			break;
 
 		cmd = decoder_data(decoder, nullptr,
-				   chunk, ret * fs,
-				   bit_rate);
+				   chunk, nframes * frame_size,
+				   kbit_rate);
 
 		if (cmd == DecoderCommand::SEEK) {
-			AFframecount frame = decoder_seek_where(decoder) *
-				audio_format.sample_rate;
-			afSeekFrame(af_fp, AF_DEFAULT_TRACK, frame);
+			AFframecount frame = decoder_seek_where_frame(decoder);
+			afSeekFrame(fh, AF_DEFAULT_TRACK, frame);
 
 			decoder_command_finished(decoder);
 			cmd = DecoderCommand::NONE;
 		}
 	} while (cmd == DecoderCommand::NONE);
 
-	afCloseFile(af_fp);
+	afCloseFile(fh);
 }
 
-static bool
-audiofile_scan_file(const char *file,
-		    const struct tag_handler *handler, void *handler_ctx)
+gcc_pure
+static SignedSongTime
+audiofile_get_duration(InputStream &is)
 {
-	int total_time = audiofile_get_duration(file);
+	if (!is.IsSeekable() || !is.KnownSize())
+		return SignedSongTime::Negative();
+
+	AudioFileInputStream afis{nullptr, is};
+	AFvirtualfile *vf = setup_virtual_fops(afis);
+	AFfilehandle fh = afOpenVirtualFile(vf, "r", nullptr);
+	if (fh == AF_NULL_FILEHANDLE)
+		return SignedSongTime::Negative();
+
+	const auto duration = audiofile_get_duration(fh);
+	afCloseFile(fh);
+	return duration;
+}
 
-	if (total_time < 0) {
-		FormatWarning(audiofile_domain,
-			      "Failed to get total song time from: %s",
-			      file);
+static bool
+audiofile_scan_stream(InputStream &is,
+		      const struct tag_handler *handler, void *handler_ctx)
+{
+	const auto duration = audiofile_get_duration(is);
+	if (duration.IsNegative())
 		return false;
-	}
 
-	tag_handler_invoke_duration(handler, handler_ctx, total_time);
+	tag_handler_invoke_duration(handler, handler_ctx, SongTime(duration));
 	return true;
 }
 
@@ -271,12 +285,12 @@ static const char *const audiofile_mime_types[] = {
 
 const struct DecoderPlugin audiofile_decoder_plugin = {
 	"audiofile",
-	nullptr,
+	audiofile_init,
 	nullptr,
 	audiofile_stream_decode,
 	nullptr,
-	audiofile_scan_file,
 	nullptr,
+	audiofile_scan_stream,
 	nullptr,
 	audiofile_suffixes,
 	audiofile_mime_types,
diff --git a/src/decoder/AudiofileDecoderPlugin.hxx b/src/decoder/plugins/AudiofileDecoderPlugin.hxx
index 5a17281b0..61129076d 100644
--- a/src/decoder/AudiofileDecoderPlugin.hxx
+++ b/src/decoder/plugins/AudiofileDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/DsdLib.cxx b/src/decoder/plugins/DsdLib.cxx
index eafedda8f..7321261f6 100644
--- a/src/decoder/DsdLib.cxx
+++ b/src/decoder/plugins/DsdLib.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,16 +25,14 @@
 
 #include "config.h"
 #include "DsdLib.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
-#include "util/bit_reverse.h"
-#include "tag/TagHandler.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "tag/TagId3.hxx"
 #include "util/Error.hxx"
+#include "util/Alloc.hxx"
 
-#include <unistd.h>
 #include <string.h>
-#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
+#include <stdlib.h>
 
 #ifdef HAVE_ID3TAG
 #include <id3tag.h>
@@ -54,27 +52,15 @@ DsdId::Equals(const char *s) const
  */
 bool
 dsdlib_skip_to(Decoder *decoder, InputStream &is,
-	       int64_t offset)
+	       offset_type offset)
 {
 	if (is.IsSeekable())
-		return is.Seek(offset, SEEK_SET, IgnoreError());
+		return is.LockSeek(offset, IgnoreError());
 
 	if (is.GetOffset() > offset)
 		return false;
 
-	char buffer[8192];
-	while (is.GetOffset() < offset) {
-		size_t length = sizeof(buffer);
-		if (offset - is.GetOffset() < (int64_t)length)
-			length = offset - is.GetOffset();
-
-		size_t nbytes = decoder_read(decoder, is, buffer, length);
-		if (nbytes == 0)
-			return false;
-	}
-
-	assert(is.GetOffset() == offset);
-	return true;
+	return dsdlib_skip(decoder, is, offset - is.GetOffset());
 }
 
 /**
@@ -82,30 +68,39 @@ dsdlib_skip_to(Decoder *decoder, InputStream &is,
  */
 bool
 dsdlib_skip(Decoder *decoder, InputStream &is,
-	    int64_t delta)
+	    offset_type delta)
 {
-	assert(delta >= 0);
-
 	if (delta == 0)
 		return true;
 
 	if (is.IsSeekable())
-		return is.Seek(delta, SEEK_CUR, IgnoreError());
+		return is.LockSeek(is.GetOffset() + delta, IgnoreError());
 
-	char buffer[8192];
-	while (delta > 0) {
-		size_t length = sizeof(buffer);
-		if ((int64_t)length > delta)
-			length = delta;
+	if (delta > 1024 * 1024)
+		/* don't skip more than one megabyte; it would be too
+		   expensive */
+		return false;
 
-		size_t nbytes = decoder_read(decoder, is, buffer, length);
-		if (nbytes == 0)
-			return false;
+	return decoder_skip(decoder, is, delta);
+}
 
-		delta -= nbytes;
-	}
+bool
+dsdlib_valid_freq(uint32_t samplefreq)
+{
+	switch (samplefreq) {
+	case 2822400: /* DSD64, 64xFs, Fs = 44.100kHz */
+	case 3072000: /* DSD64 with Fs = 48.000 kHz */
+	case 5644800:
+	case 6144000:
+	case 11289600:
+	case 12288000:
+	case 22579200:/* DSD512 */
+	case 24576000:
+		return true;
 
-	return true;
+	default:
+		return false;
+	}
 }
 
 #ifdef HAVE_ID3TAG
@@ -116,42 +111,41 @@ dsdlib_tag_id3(InputStream &is,
 {
 	assert(tagoffset >= 0);
 
-	if (tagoffset == 0)
+	if (tagoffset == 0 || !is.KnownSize())
 		return;
 
 	if (!dsdlib_skip_to(nullptr, is, tagoffset))
 		return;
 
-	struct id3_tag *id3_tag = nullptr;
-	id3_length_t count;
-
 	/* Prevent broken files causing problems */
 	const auto size = is.GetSize();
 	const auto offset = is.GetOffset();
 	if (offset >= size)
 		return;
 
-	count = size - offset;
+	const id3_length_t count = size - offset;
 
-	/* Check and limit id3 tag size to prevent a stack overflow */
-	if (count == 0 || count > 4096)
+	if (count < 10 || count > 256*1024)
 		return;
 
-	id3_byte_t dsdid3[count];
-	id3_byte_t *dsdid3data;
-	dsdid3data = dsdid3;
+	id3_byte_t *const id3_buf = static_cast<id3_byte_t*>(xalloc(count));
 
-	if (!decoder_read_full(nullptr, is, dsdid3data, count))
+	if (!decoder_read_full(nullptr, is, id3_buf, count)) {
+		free(id3_buf);
 		return;
+	}
 
-	id3_tag = id3_tag_parse(dsdid3data, count);
-	if (id3_tag == nullptr)
+	struct id3_tag *id3_tag = id3_tag_parse(id3_buf, count);
+	if (id3_tag == nullptr) {
+		free(id3_buf);
 		return;
+	}
 
 	scan_id3_tag(id3_tag, handler, handler_ctx);
 
 	id3_tag_delete(id3_tag);
 
+	free(id3_buf);
 	return;
 }
 #endif
diff --git a/src/decoder/DsdLib.hxx b/src/decoder/plugins/DsdLib.hxx
index 5c6127149..8295bcbf6 100644
--- a/src/decoder/DsdLib.hxx
+++ b/src/decoder/plugins/DsdLib.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,13 +21,14 @@
 #define MPD_DECODER_DSDLIB_HXX
 
 #include "system/ByteOrder.hxx"
+#include "input/Offset.hxx"
 #include "Compiler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 struct Decoder;
-struct InputStream;
+class InputStream;
 
 struct DsdId {
 	char value[4];
@@ -60,11 +61,18 @@ public:
 
 bool
 dsdlib_skip_to(Decoder *decoder, InputStream &is,
-	       int64_t offset);
+	       offset_type offset);
 
 bool
 dsdlib_skip(Decoder *decoder, InputStream &is,
-	    int64_t delta);
+	    offset_type delta);
+
+/**
+ * Check if the sample frequency is a valid DSD frequency.
+ **/
+gcc_const
+bool
+dsdlib_valid_freq(uint32_t samplefreq);
 
 /**
  * Add tags from ID3 tag. All tags commonly found in the ID3 tags of
diff --git a/src/decoder/DsdiffDecoderPlugin.cxx b/src/decoder/plugins/DsdiffDecoderPlugin.cxx
index 767395215..b6c79e11e 100644
--- a/src/decoder/DsdiffDecoderPlugin.cxx
+++ b/src/decoder/plugins/DsdiffDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -28,8 +28,8 @@
 
 #include "config.h"
 #include "DsdiffDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "util/bit_reverse.h"
 #include "util/Error.hxx"
@@ -38,9 +38,6 @@
 #include "DsdLib.hxx"
 #include "Log.hxx"
 
-#include <unistd.h>
-#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
-
 struct DsdiffHeader {
 	DsdId id;
 	DffDsdUint64 size;
@@ -69,15 +66,7 @@ struct dsdiff_native_tag {
 struct DsdiffMetaData {
 	unsigned sample_rate, channels;
 	bool bitreverse;
-	uint64_t chunk_size;
-#ifdef HAVE_ID3TAG
-	InputStream::offset_type id3_offset;
-	uint64_t id3_size;
-#endif
-	/** offset for artist tag */
-	InputStream::offset_type diar_offset;
-	/** offset for title tag */
-	InputStream::offset_type diti_offset;
+	offset_type chunk_size;
 };
 
 static bool lsbitfirst;
@@ -121,14 +110,14 @@ dsdiff_read_payload(Decoder *decoder, InputStream &is,
 static bool
 dsdiff_read_prop_snd(Decoder *decoder, InputStream &is,
 		     DsdiffMetaData *metadata,
-		     InputStream::offset_type end_offset)
+		     offset_type end_offset)
 {
 	DsdiffChunkHeader header;
-	while ((InputStream::offset_type)(is.GetOffset() + sizeof(header)) <= end_offset) {
+	while (is.GetOffset() + sizeof(header) <= end_offset) {
 		if (!dsdiff_read_chunk_header(decoder, is, &header))
 			return false;
 
-		InputStream::offset_type chunk_end_offset = is.GetOffset()
+		offset_type chunk_end_offset = is.GetOffset()
 			+ header.GetSize();
 		if (chunk_end_offset > end_offset)
 			return false;
@@ -182,7 +171,7 @@ dsdiff_read_prop(Decoder *decoder, InputStream &is,
 		 const DsdiffChunkHeader *prop_header)
 {
 	uint64_t prop_size = prop_header->GetSize();
-	InputStream::offset_type end_offset = is.GetOffset() + prop_size;
+	const offset_type end_offset = is.GetOffset() + prop_size;
 
 	DsdId prop_id;
 	if (prop_size < sizeof(prop_id) ||
@@ -199,7 +188,7 @@ dsdiff_read_prop(Decoder *decoder, InputStream &is,
 static void
 dsdiff_handle_native_tag(InputStream &is,
 			 const struct tag_handler *handler,
-			 void *handler_ctx, InputStream::offset_type tagoffset,
+			 void *handler_ctx, offset_type tagoffset,
 			 TagType type)
 {
 	if (!dsdlib_skip_to(nullptr, is, tagoffset))
@@ -250,18 +239,20 @@ dsdiff_read_metadata_extra(Decoder *decoder, InputStream &is,
 	if (!dsdiff_read_chunk_header(decoder, is, chunk_header))
 		return false;
 
-	metadata->diar_offset = 0;
-	metadata->diti_offset = 0;
+	/** offset for artist tag */
+	offset_type artist_offset = 0;
+	/** offset for title tag */
+	offset_type title_offset = 0;
 
 #ifdef HAVE_ID3TAG
-	metadata->id3_offset = 0;
+	offset_type id3_offset = 0;
 #endif
 
 	/* Now process all the remaining chunk headers in the stream
 	   and record their position and size */
 
 	do {
-		uint64_t chunk_size = chunk_header->GetSize();
+		offset_type chunk_size = chunk_header->GetSize();
 
 		/* DIIN chunk, is directly followed by other chunks  */
 		if (chunk_header->id.Equals("DIIN"))
@@ -270,20 +261,19 @@ dsdiff_read_metadata_extra(Decoder *decoder, InputStream &is,
 		/* DIAR chunk - DSDIFF native tag for Artist */
 		if (chunk_header->id.Equals("DIAR")) {
 			chunk_size = chunk_header->GetSize();
-			metadata->diar_offset = is.GetOffset();
+			artist_offset = is.GetOffset();
 		}
 
 		/* DITI chunk - DSDIFF native tag for Title */
 		if (chunk_header->id.Equals("DITI")) {
 			chunk_size = chunk_header->GetSize();
-			metadata->diti_offset = is.GetOffset();
+			title_offset = is.GetOffset();
 		}
 #ifdef HAVE_ID3TAG
 		/* 'ID3 ' chunk, offspec. Used by sacdextract */
 		if (chunk_header->id.Equals("ID3 ")) {
 			chunk_size = chunk_header->GetSize();
-			metadata->id3_offset = is.GetOffset();
-			metadata->id3_size = chunk_size;
+			id3_offset = is.GetOffset();
 		}
 #endif
 
@@ -294,22 +284,21 @@ dsdiff_read_metadata_extra(Decoder *decoder, InputStream &is,
 	/* done processing chunk headers, process tags if any */
 
 #ifdef HAVE_ID3TAG
-	if (metadata->id3_offset != 0)
-	{
+	if (id3_offset != 0) {
 		/* a ID3 tag has preference over the other tags, do not process
 		   other tags if we have one */
-		dsdlib_tag_id3(is, handler, handler_ctx, metadata->id3_offset);
+		dsdlib_tag_id3(is, handler, handler_ctx, id3_offset);
 		return true;
 	}
 #endif
 
-	if (metadata->diar_offset != 0)
+	if (artist_offset != 0)
 		dsdiff_handle_native_tag(is, handler, handler_ctx,
-					 metadata->diar_offset, TAG_ARTIST);
+					 artist_offset, TAG_ARTIST);
 
-	if (metadata->diti_offset != 0)
+	if (title_offset != 0)
 		dsdiff_handle_native_tag(is, handler, handler_ctx,
-					 metadata->diti_offset, TAG_TITLE);
+					 title_offset, TAG_TITLE);
 	return true;
 }
 
@@ -339,13 +328,13 @@ dsdiff_read_metadata(Decoder *decoder, InputStream &is,
 					      chunk_header))
 					return false;
 		} else if (chunk_header->id.Equals("DSD ")) {
-			const uint64_t chunk_size = chunk_header->GetSize();
+			const offset_type chunk_size = chunk_header->GetSize();
 			metadata->chunk_size = chunk_size;
 			return true;
 		} else {
 			/* ignore unknown chunk */
-			const uint64_t chunk_size = chunk_header->GetSize();
-			InputStream::offset_type chunk_end_offset =
+			const offset_type chunk_size = chunk_header->GetSize();
+			const offset_type chunk_end_offset =
 				is.GetOffset() + chunk_size;
 
 			if (!dsdlib_skip_to(decoder, is, chunk_end_offset))
@@ -361,29 +350,53 @@ bit_reverse_buffer(uint8_t *p, uint8_t *end)
 		*p = bit_reverse(*p);
 }
 
+static offset_type
+FrameToOffset(uint64_t frame, unsigned channels)
+{
+	return frame * channels;
+}
+
 /**
  * Decode one "DSD" chunk.
  */
 static bool
 dsdiff_decode_chunk(Decoder &decoder, InputStream &is,
-		    unsigned channels,
-		    uint64_t chunk_size)
+		    unsigned channels, unsigned sample_rate,
+		    const offset_type total_bytes)
 {
+	const offset_type start_offset = is.GetOffset();
+
 	uint8_t buffer[8192];
 
 	const size_t sample_size = sizeof(buffer[0]);
 	const size_t frame_size = channels * sample_size;
 	const unsigned buffer_frames = sizeof(buffer) / frame_size;
-	const unsigned buffer_samples = buffer_frames * frame_size;
-	const size_t buffer_size = buffer_samples * sample_size;
+	const size_t buffer_size = buffer_frames * frame_size;
+
+	auto cmd = decoder_get_command(decoder);
+	for (offset_type remaining_bytes = total_bytes;
+	     remaining_bytes >= frame_size && cmd != DecoderCommand::STOP;) {
+		if (cmd == DecoderCommand::SEEK) {
+			uint64_t frame = decoder_seek_where_frame(decoder);
+			offset_type offset = FrameToOffset(frame, channels);
+			if (offset >= total_bytes) {
+				decoder_command_finished(decoder);
+				break;
+			}
+
+			if (dsdlib_skip_to(&decoder, is,
+					   start_offset + offset)) {
+				decoder_command_finished(decoder);
+				remaining_bytes = total_bytes - offset;
+			} else
+				decoder_seek_error(decoder);
+		}
 
-	while (chunk_size >= frame_size) {
 		/* see how much aligned data from the remaining chunk
 		   fits into the local buffer */
 		size_t now_size = buffer_size;
-		if (chunk_size < (uint64_t)now_size) {
-			unsigned now_frames =
-				(unsigned)chunk_size / frame_size;
+		if (remaining_bytes < (offset_type)now_size) {
+			unsigned now_frames = remaining_bytes / frame_size;
 			now_size = now_frames * frame_size;
 		}
 
@@ -391,28 +404,16 @@ dsdiff_decode_chunk(Decoder &decoder, InputStream &is,
 			return false;
 
 		const size_t nbytes = now_size;
-		chunk_size -= nbytes;
+		remaining_bytes -= nbytes;
 
 		if (lsbitfirst)
 			bit_reverse_buffer(buffer, buffer + nbytes);
 
-		const auto cmd = decoder_data(decoder, is, buffer, nbytes, 0);
-		switch (cmd) {
-		case DecoderCommand::NONE:
-			break;
-
-		case DecoderCommand::START:
-		case DecoderCommand::STOP:
-			return false;
-
-		case DecoderCommand::SEEK:
-
-			/* Not implemented yet */
-			decoder_seek_error(decoder);
-			break;
-		}
+		cmd = decoder_data(decoder, is, buffer, nbytes,
+				   sample_rate / 1000);
 	}
-	return dsdlib_skip(&decoder, is, chunk_size);
+
+	return true;
 }
 
 static void
@@ -435,36 +436,22 @@ dsdiff_stream_decode(Decoder &decoder, InputStream &is)
 	}
 
 	/* calculate song time from DSD chunk size and sample frequency */
-	uint64_t chunk_size = metadata.chunk_size;
-	float songtime = ((chunk_size / metadata.channels) * 8) /
-			 (float) metadata.sample_rate;
+	offset_type chunk_size = metadata.chunk_size;
+
+	uint64_t n_frames = chunk_size / audio_format.channels;
+	auto songtime = SongTime::FromScale<uint64_t>(n_frames,
+						      audio_format.sample_rate);
 
 	/* success: file was recognized */
-	decoder_initialized(decoder, audio_format, false, songtime);
+	decoder_initialized(decoder, audio_format, is.IsSeekable(), songtime);
 
 	/* every iteration of the following loop decodes one "DSD"
 	   chunk from a DFF file */
 
-	while (true) {
-		chunk_size = chunk_header.GetSize();
-
-		if (chunk_header.id.Equals("DSD ")) {
-			if (!dsdiff_decode_chunk(decoder, is,
-						 metadata.channels,
-						 chunk_size))
-					break;
-		} else {
-			/* ignore other chunks */
-			if (!dsdlib_skip(&decoder, is, chunk_size))
-				break;
-		}
-
-		/* read next chunk header; the first one was read by
-		   dsdiff_read_metadata() */
-		if (!dsdiff_read_chunk_header(&decoder,
-					      is, &chunk_header))
-			break;
-	}
+	dsdiff_decode_chunk(decoder, is,
+			    metadata.channels,
+			    metadata.sample_rate,
+			    chunk_size);
 }
 
 static bool
@@ -487,8 +474,9 @@ dsdiff_scan_stream(InputStream &is,
 		return false;
 
 	/* calculate song time and add as tag */
-	unsigned songtime = ((metadata.chunk_size / metadata.channels) * 8) /
-			    metadata.sample_rate;
+	uint64_t n_frames = metadata.chunk_size / audio_format.channels;
+	auto songtime = SongTime::FromScale<uint64_t>(n_frames,
+						      audio_format.sample_rate);
 	tag_handler_invoke_duration(handler, handler_ctx, songtime);
 
 	/* Read additional metadata and created tags if available */
diff --git a/src/decoder/DsdiffDecoderPlugin.hxx b/src/decoder/plugins/DsdiffDecoderPlugin.hxx
index be14fc9cd..7aa36752b 100644
--- a/src/decoder/DsdiffDecoderPlugin.hxx
+++ b/src/decoder/plugins/DsdiffDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/DsfDecoderPlugin.cxx b/src/decoder/plugins/DsfDecoderPlugin.cxx
index 9fbfe9cda..690616d15 100644
--- a/src/decoder/DsfDecoderPlugin.cxx
+++ b/src/decoder/plugins/DsfDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -29,8 +29,8 @@
 
 #include "config.h"
 #include "DsfDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "util/bit_reverse.h"
 #include "util/Error.hxx"
@@ -39,16 +39,16 @@
 #include "tag/TagHandler.hxx"
 #include "Log.hxx"
 
-#include <unistd.h>
-#include <stdio.h> /* for SEEK_SET, SEEK_CUR */
+#include <string.h>
+
+static constexpr unsigned DSF_BLOCK_SIZE = 4096;
 
 struct DsfMetaData {
 	unsigned sample_rate, channels;
 	bool bitreverse;
-	uint64_t chunk_size;
+	offset_type n_blocks;
 #ifdef HAVE_ID3TAG
-	InputStream::offset_type id3_offset;
-	uint64_t id3_size;
+	offset_type id3_offset;
 #endif
 };
 
@@ -107,12 +107,12 @@ dsf_read_metadata(Decoder *decoder, InputStream &is,
 	    !dsf_header.id.Equals("DSD "))
 		return false;
 
-	const uint64_t chunk_size = dsf_header.size.Read();
+	const offset_type chunk_size = dsf_header.size.Read();
 	if (sizeof(dsf_header) != chunk_size)
 		return false;
 
 #ifdef HAVE_ID3TAG
-	const uint64_t metadata_offset = dsf_header.pmeta.Read();
+	const offset_type metadata_offset = dsf_header.pmeta.Read();
 #endif
 
 	/* read the 'fmt ' chunk of the DSF file */
@@ -127,19 +127,20 @@ dsf_read_metadata(Decoder *decoder, InputStream &is,
 		return false;
 
 	uint32_t samplefreq = FromLE32(dsf_fmt_chunk.sample_freq);
+	const unsigned channels = FromLE32(dsf_fmt_chunk.channelnum);
 
 	/* for now, only support version 1 of the standard, DSD raw stereo
 	   files with a sample freq of 2822400 or 5644800 Hz */
 
-	if (dsf_fmt_chunk.version != 1 || dsf_fmt_chunk.formatid != 0
-	    || dsf_fmt_chunk.channeltype != 2
-	    || dsf_fmt_chunk.channelnum != 2
-	    || (samplefreq != 2822400 && samplefreq != 5644800))
+	if (FromLE32(dsf_fmt_chunk.version) != 1 ||
+	    FromLE32(dsf_fmt_chunk.formatid) != 0 ||
+	    !audio_valid_channel_count(channels) ||
+	    !dsdlib_valid_freq(samplefreq))
 		return false;
 
 	uint32_t chblksize = FromLE32(dsf_fmt_chunk.block_size);
 	/* according to the spec block size should always be 4096 */
-	if (chblksize != 4096)
+	if (chblksize != DSF_BLOCK_SIZE)
 		return false;
 
 	/* read the 'data' chunk of the DSF file */
@@ -151,37 +152,33 @@ dsf_read_metadata(Decoder *decoder, InputStream &is,
 	/* data size of DSF files are padded to multiple of 4096,
 	   we use the actual data size as chunk size */
 
-	uint64_t data_size = data_chunk.size.Read();
+	offset_type data_size = data_chunk.size.Read();
 	if (data_size < sizeof(data_chunk))
 		return false;
 
 	data_size -= sizeof(data_chunk);
 
 	/* data_size cannot be bigger or equal to total file size */
-	const uint64_t size = (uint64_t)is.GetSize();
-	if (data_size >= size)
+	if (is.KnownSize() && data_size > is.GetRest())
 		return false;
 
 	/* use the sample count from the DSF header as the upper
 	   bound, because some DSF files contain junk at the end of
 	   the "data" chunk */
 	const uint64_t samplecnt = dsf_fmt_chunk.scnt.Read();
-	const uint64_t playable_size = samplecnt * 2 / 8;
+	const offset_type playable_size = samplecnt * channels / 8;
 	if (data_size > playable_size)
 		data_size = playable_size;
 
-	metadata->chunk_size = data_size;
-	metadata->channels = (unsigned) dsf_fmt_chunk.channelnum;
+	const size_t block_size = channels * DSF_BLOCK_SIZE;
+	metadata->n_blocks = data_size / block_size;
+	metadata->channels = channels;
 	metadata->sample_rate = samplefreq;
 #ifdef HAVE_ID3TAG
-	/* metada_offset cannot be bigger then or equal to total file size */
-	if (metadata_offset >= size)
-		metadata->id3_offset = 0;
-	else
-		metadata->id3_offset = (InputStream::offset_type)metadata_offset;
+	metadata->id3_offset = metadata_offset;
 #endif
 	/* check bits per sample format, determine if bitreverse is needed */
-	metadata->bitreverse = dsf_fmt_chunk.bitssample == 1;
+	metadata->bitreverse = FromLE32(dsf_fmt_chunk.bitssample) == 1;
 	return true;
 }
 
@@ -192,6 +189,13 @@ bit_reverse_buffer(uint8_t *p, uint8_t *end)
 		*p = bit_reverse(*p);
 }
 
+static void
+InterleaveDsfBlockMono(uint8_t *gcc_restrict dest,
+		       const uint8_t *gcc_restrict src)
+{
+	memcpy(dest, src, DSF_BLOCK_SIZE);
+}
+
 /**
  * DSF data is build up of alternating 4096 blocks of DSD samples for left and
  * right. Convert the buffer holding 1 block of 4096 DSD left samples and 1
@@ -199,22 +203,49 @@ bit_reverse_buffer(uint8_t *p, uint8_t *end)
  * order.
  */
 static void
-dsf_to_pcm_order(uint8_t *dest, uint8_t *scratch, size_t nrbytes)
+InterleaveDsfBlockStereo(uint8_t *gcc_restrict dest,
+			 const uint8_t *gcc_restrict src)
 {
-	for (unsigned i = 0, j = 0; i < (unsigned)nrbytes; i += 2) {
-		scratch[i] = *(dest+j);
-		j++;
+	for (size_t i = 0; i < DSF_BLOCK_SIZE; ++i) {
+		dest[2 * i] = src[i];
+		dest[2 * i + 1] = src[DSF_BLOCK_SIZE + i];
 	}
+}
 
-	for (unsigned i = 1, j = 0; i < (unsigned) nrbytes; i += 2) {
-		scratch[i] = *(dest+4096+j);
-		j++;
-	}
+static void
+InterleaveDsfBlockChannel(uint8_t *gcc_restrict dest,
+			  const uint8_t *gcc_restrict src,
+			  unsigned channels)
+{
+	for (size_t i = 0; i < DSF_BLOCK_SIZE; ++i, dest += channels, ++src)
+		*dest = *src;
+}
 
-	for (unsigned i = 0; i < (unsigned)nrbytes; i++) {
-		*dest = scratch[i];
-		dest++;
-	}
+static void
+InterleaveDsfBlockGeneric(uint8_t *gcc_restrict dest,
+			  const uint8_t *gcc_restrict src,
+			  unsigned channels)
+{
+	for (unsigned c = 0; c < channels; ++c, ++dest, src += DSF_BLOCK_SIZE)
+		InterleaveDsfBlockChannel(dest, src, channels);
+}
+
+static void
+InterleaveDsfBlock(uint8_t *gcc_restrict dest, const uint8_t *gcc_restrict src,
+		   unsigned channels)
+{
+	if (channels == 1)
+		InterleaveDsfBlockMono(dest, src);
+	else if (channels == 2)
+		InterleaveDsfBlockStereo(dest, src);
+	else
+		InterleaveDsfBlockGeneric(dest, src, channels);
+}
+
+static offset_type
+FrameToBlock(uint64_t frame)
+{
+	return frame / DSF_BLOCK_SIZE;
 }
 
 /**
@@ -222,60 +253,50 @@ dsf_to_pcm_order(uint8_t *dest, uint8_t *scratch, size_t nrbytes)
  */
 static bool
 dsf_decode_chunk(Decoder &decoder, InputStream &is,
-		    unsigned channels,
-		    uint64_t chunk_size,
-		    bool bitreverse)
+		 unsigned channels, unsigned sample_rate,
+		 offset_type n_blocks,
+		 bool bitreverse)
 {
-	uint8_t buffer[8192];
-
-	/* scratch buffer for DSF samples to convert to the needed
-	   normal left/right regime of samples */
-	uint8_t dsf_scratch_buffer[8192];
-
-	const size_t sample_size = sizeof(buffer[0]);
-	const size_t frame_size = channels * sample_size;
-	const unsigned buffer_frames = sizeof(buffer) / frame_size;
-	const unsigned buffer_samples = buffer_frames * frame_size;
-	const size_t buffer_size = buffer_samples * sample_size;
-
-	while (chunk_size >= frame_size) {
-		/* see how much aligned data from the remaining chunk
-		   fits into the local buffer */
-		size_t now_size = buffer_size;
-		if (chunk_size < (uint64_t)now_size) {
-			unsigned now_frames =
-				(unsigned)chunk_size / frame_size;
-			now_size = now_frames * frame_size;
+	const size_t block_size = channels * DSF_BLOCK_SIZE;
+	const offset_type start_offset = is.GetOffset();
+
+	auto cmd = decoder_get_command(decoder);
+	for (offset_type i = 0; i < n_blocks && cmd != DecoderCommand::STOP;) {
+		if (cmd == DecoderCommand::SEEK) {
+			uint64_t frame = decoder_seek_where_frame(decoder);
+			offset_type block = FrameToBlock(frame);
+			if (block >= n_blocks) {
+				decoder_command_finished(decoder);
+				break;
+			}
+
+			offset_type offset =
+				start_offset + block * block_size;
+			if (dsdlib_skip_to(&decoder, is, offset)) {
+				decoder_command_finished(decoder);
+				i = block;
+			} else
+				decoder_seek_error(decoder);
 		}
 
-		if (!decoder_read_full(&decoder, is, buffer, now_size))
+		/* worst-case buffer size */
+		uint8_t buffer[MAX_CHANNELS * DSF_BLOCK_SIZE];
+		if (!decoder_read_full(&decoder, is, buffer, block_size))
 			return false;
 
-		const size_t nbytes = now_size;
-		chunk_size -= nbytes;
-
 		if (bitreverse)
-			bit_reverse_buffer(buffer, buffer + nbytes);
+			bit_reverse_buffer(buffer, buffer + block_size);
 
-		dsf_to_pcm_order(buffer, dsf_scratch_buffer, nbytes);
+		uint8_t interleaved_buffer[MAX_CHANNELS * DSF_BLOCK_SIZE];
+		InterleaveDsfBlock(interleaved_buffer, buffer, channels);
 
-		const auto cmd = decoder_data(decoder, is, buffer, nbytes, 0);
-		switch (cmd) {
-		case DecoderCommand::NONE:
-			break;
-
-		case DecoderCommand::START:
-		case DecoderCommand::STOP:
-			return false;
-
-		case DecoderCommand::SEEK:
-
-			/* not implemented yet */
-			decoder_seek_error(decoder);
-			break;
-			}
+		cmd = decoder_data(decoder, is,
+				   interleaved_buffer, block_size,
+				   sample_rate / 1000);
+		++i;
 	}
-	return dsdlib_skip(&decoder, is, chunk_size);
+
+	return true;
 }
 
 static void
@@ -295,17 +316,17 @@ dsf_stream_decode(Decoder &decoder, InputStream &is)
 		return;
 	}
 	/* Calculate song time from DSD chunk size and sample frequency */
-	uint64_t chunk_size = metadata.chunk_size;
-	float songtime = ((chunk_size / metadata.channels) * 8) /
-			 (float) metadata.sample_rate;
+	const auto n_blocks = metadata.n_blocks;
+	auto songtime = SongTime::FromScale<uint64_t>(n_blocks * DSF_BLOCK_SIZE,
+						      audio_format.sample_rate);
 
 	/* success: file was recognized */
-	decoder_initialized(decoder, audio_format, false, songtime);
+	decoder_initialized(decoder, audio_format, is.IsSeekable(), songtime);
 
-	if (!dsf_decode_chunk(decoder, is, metadata.channels,
-			      chunk_size,
-			      metadata.bitreverse))
-		return;
+	dsf_decode_chunk(decoder, is, metadata.channels,
+			 metadata.sample_rate,
+			 n_blocks,
+			 metadata.bitreverse);
 }
 
 static bool
@@ -326,8 +347,9 @@ dsf_scan_stream(InputStream &is,
 		return false;
 
 	/* calculate song time and add as tag */
-	unsigned songtime = ((metadata.chunk_size / metadata.channels) * 8) /
-			    metadata.sample_rate;
+	const auto n_blocks = metadata.n_blocks;
+	auto songtime = SongTime::FromScale<uint64_t>(n_blocks * DSF_BLOCK_SIZE,
+						      audio_format.sample_rate);
 	tag_handler_invoke_duration(handler, handler_ctx, songtime);
 
 #ifdef HAVE_ID3TAG
diff --git a/src/decoder/DsfDecoderPlugin.hxx b/src/decoder/plugins/DsfDecoderPlugin.hxx
index 921c94698..02bea0b5c 100644
--- a/src/decoder/DsfDecoderPlugin.hxx
+++ b/src/decoder/plugins/DsfDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FaadDecoderPlugin.cxx b/src/decoder/plugins/FaadDecoderPlugin.cxx
index ae1181b4c..add23aaa4 100644
--- a/src/decoder/FaadDecoderPlugin.cxx
+++ b/src/decoder/plugins/FaadDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,11 +19,12 @@
 
 #include "config.h"
 #include "FaadDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "DecoderBuffer.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "../DecoderBuffer.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
+#include "util/ConstBuffer.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
@@ -62,55 +63,42 @@ adts_check_frame(const unsigned char *data)
  * found or if not enough data is available.
  */
 static size_t
-adts_find_frame(DecoderBuffer *buffer)
+adts_find_frame(DecoderBuffer &buffer)
 {
 	while (true) {
-		size_t length;
-		const uint8_t *data = (const uint8_t *)
-			decoder_buffer_read(buffer, &length);
-		if (data == nullptr || length < 8) {
-			/* not enough data yet */
-			if (!decoder_buffer_fill(buffer))
-				/* failed */
-				return 0;
-
-			continue;
-		}
+		auto data = ConstBuffer<uint8_t>::FromVoid(buffer.Need(8));
+		if (data.IsNull())
+			/* failed */
+			return 0;
 
 		/* find the 0xff marker */
-		const uint8_t *p = (const uint8_t *)memchr(data, 0xff, length);
+		const uint8_t *p = (const uint8_t *)
+			memchr(data.data, 0xff, data.size);
 		if (p == nullptr) {
 			/* no marker - discard the buffer */
-			decoder_buffer_clear(buffer);
+			buffer.Clear();
 			continue;
 		}
 
-		if (p > data) {
+		if (p > data.data) {
 			/* discard data before 0xff */
-			decoder_buffer_consume(buffer, p - data);
+			buffer.Consume(p - data.data);
 			continue;
 		}
 
 		/* is it a frame? */
-		const size_t frame_length = adts_check_frame(data);
+		const size_t frame_length = adts_check_frame(data.data);
 		if (frame_length == 0) {
 			/* it's just some random 0xff byte; discard it
 			   and continue searching */
-			decoder_buffer_consume(buffer, 1);
+			buffer.Consume(1);
 			continue;
 		}
 
-		if (length < frame_length) {
-			/* available buffer size is smaller than the
-			   frame will be - attempt to read more
-			   data */
-			if (!decoder_buffer_fill(buffer)) {
-				/* not enough data; discard this frame
-				   to prevent a possible buffer
-				   overflow */
-				decoder_buffer_clear(buffer);
-			}
-
+		if (buffer.Need(frame_length).IsNull()) {
+			/* not enough data; discard this frame to
+			   prevent a possible buffer overflow */
+			buffer.Clear();
 			continue;
 		}
 
@@ -119,38 +107,34 @@ adts_find_frame(DecoderBuffer *buffer)
 	}
 }
 
-static float
-adts_song_duration(DecoderBuffer *buffer)
+static SignedSongTime
+adts_song_duration(DecoderBuffer &buffer)
 {
-	const InputStream &is = decoder_buffer_get_stream(buffer);
+	const InputStream &is = buffer.GetStream();
 	const bool estimate = !is.CheapSeeking();
-	const auto file_size = is.GetSize();
-	if (estimate && file_size <= 0)
-		return -1;
+	if (estimate && !is.KnownSize())
+		return SignedSongTime::Negative();
 
 	unsigned sample_rate = 0;
 
 	/* Read all frames to ensure correct time and bitrate */
-	unsigned frames;
-	for (frames = 0;; frames++) {
+	unsigned frames = 0;
+	for (;; frames++) {
 		const unsigned frame_length = adts_find_frame(buffer);
 		if (frame_length == 0)
 			break;
 
-
 		if (frames == 0) {
-			size_t buffer_length;
-			const uint8_t *data = (const uint8_t *)
-				decoder_buffer_read(buffer, &buffer_length);
-			assert(data != nullptr);
-			assert(frame_length <= buffer_length);
+			auto data = ConstBuffer<uint8_t>::FromVoid(buffer.Read());
+			assert(!data.IsEmpty());
+			assert(frame_length <= data.size);
 
-			sample_rate = adts_sample_rates[(data[2] & 0x3c) >> 2];
+			sample_rate = adts_sample_rates[(data.data[2] & 0x3c) >> 2];
 			if (sample_rate == 0)
 				break;
 		}
 
-		decoder_buffer_consume(buffer, frame_length);
+		buffer.Consume(frame_length);
 
 		if (estimate && frames == 128) {
 			/* if this is a remote file, don't slurp the
@@ -160,88 +144,85 @@ adts_song_duration(DecoderBuffer *buffer)
 			   have until now */
 
 			const auto offset = is.GetOffset()
-				- decoder_buffer_available(buffer);
+				- buffer.GetAvailable();
 			if (offset <= 0)
-				return -1;
+				return SignedSongTime::Negative();
 
+			const auto file_size = is.GetSize();
 			frames = (frames * file_size) / offset;
 			break;
 		}
 	}
 
 	if (sample_rate == 0)
-		return -1;
-
-	float frames_per_second = (float)sample_rate / 1024.0;
-	assert(frames_per_second > 0);
+		return SignedSongTime::Negative();
 
-	return (float)frames / frames_per_second;
+	return SignedSongTime::FromScale<uint64_t>(frames * uint64_t(1024),
+						   sample_rate);
 }
 
-static float
-faad_song_duration(DecoderBuffer *buffer, InputStream &is)
+static SignedSongTime
+faad_song_duration(DecoderBuffer &buffer, InputStream &is)
 {
-	const auto size = is.GetSize();
-	const size_t fileread = size >= 0 ? size : 0;
-
-	decoder_buffer_fill(buffer);
-	size_t length;
-	const uint8_t *data = (const uint8_t *)
-		decoder_buffer_read(buffer, &length);
-	if (data == nullptr)
-		return -1;
+	auto data = ConstBuffer<uint8_t>::FromVoid(buffer.Need(5));
+	if (data.IsNull())
+		return SignedSongTime::Negative();
 
 	size_t tagsize = 0;
-	if (length >= 10 && !memcmp(data, "ID3", 3)) {
+	if (data.size >= 10 && !memcmp(data.data, "ID3", 3)) {
 		/* skip the ID3 tag */
 
-		tagsize = (data[6] << 21) | (data[7] << 14) |
-		    (data[8] << 7) | (data[9] << 0);
+		tagsize = (data.data[6] << 21) | (data.data[7] << 14) |
+		    (data.data[8] << 7) | (data.data[9] << 0);
 
 		tagsize += 10;
 
-		const bool success = decoder_buffer_skip(buffer, tagsize) &&
-			decoder_buffer_fill(buffer);
-		if (!success)
-			return -1;
+		if (!buffer.Skip(tagsize))
+			return SignedSongTime::Negative();
 
-		data = (const uint8_t *)decoder_buffer_read(buffer, &length);
-		if (data == nullptr)
-			return -1;
+		data = ConstBuffer<uint8_t>::FromVoid(buffer.Need(5));
+		if (data.IsNull())
+			return SignedSongTime::Negative();
 	}
 
-	if (length >= 8 && adts_check_frame(data) > 0) {
+	if (data.size >= 8 && adts_check_frame(data.data) > 0) {
 		/* obtain the duration from the ADTS header */
 
 		if (!is.IsSeekable())
-			return -1;
+			return SignedSongTime::Negative();
+
+		auto song_length = adts_song_duration(buffer);
 
-		float song_length = adts_song_duration(buffer);
+		is.LockSeek(tagsize, IgnoreError());
 
-		is.LockSeek(tagsize, SEEK_SET, IgnoreError());
-		decoder_buffer_clear(buffer);
+		buffer.Clear();
 
 		return song_length;
-	} else if (length >= 5 && memcmp(data, "ADIF", 4) == 0) {
+	} else if (data.size >= 5 && memcmp(data.data, "ADIF", 4) == 0) {
 		/* obtain the duration from the ADIF header */
-		size_t skip_size = (data[4] & 0x80) ? 9 : 0;
 
-		if (8 + skip_size > length)
+		if (!is.KnownSize())
+			return SignedSongTime::Negative();
+
+		size_t skip_size = (data.data[4] & 0x80) ? 9 : 0;
+
+		if (8 + skip_size > data.size)
 			/* not enough data yet; skip parsing this
 			   header */
-			return -1;
+			return SignedSongTime::Negative();
+
+		unsigned bit_rate = ((data.data[4 + skip_size] & 0x0F) << 19) |
+			(data.data[5 + skip_size] << 11) |
+			(data.data[6 + skip_size] << 3) |
+			(data.data[7 + skip_size] & 0xE0);
 
-		unsigned bit_rate = ((data[4 + skip_size] & 0x0F) << 19) |
-			(data[5 + skip_size] << 11) |
-			(data[6 + skip_size] << 3) |
-			(data[7 + skip_size] & 0xE0);
+		const auto size = is.GetSize();
+		if (bit_rate == 0)
+			return SignedSongTime::Negative();
 
-		if (fileread != 0 && bit_rate != 0)
-			return fileread * 8.0 / bit_rate;
-		else
-			return fileread;
+		return SongTime::FromScale(size, bit_rate / 8);
 	} else
-		return -1;
+		return SignedSongTime::Negative();
 }
 
 static NeAACDecHandle
@@ -264,14 +245,11 @@ faad_decoder_new()
  * inconsistencies in libfaad.
  */
 static bool
-faad_decoder_init(NeAACDecHandle decoder, DecoderBuffer *buffer,
+faad_decoder_init(NeAACDecHandle decoder, DecoderBuffer &buffer,
 		  AudioFormat &audio_format, Error &error)
 {
-
-	size_t length;
-	const unsigned char *data = (const unsigned char *)
-		decoder_buffer_read(buffer, &length);
-	if (data == nullptr) {
+	auto data = ConstBuffer<uint8_t>::FromVoid(buffer.Read());
+	if (data.IsEmpty()) {
 		error.Set(faad_decoder_domain, "Empty file");
 		return false;
 	}
@@ -280,15 +258,15 @@ faad_decoder_init(NeAACDecHandle decoder, DecoderBuffer *buffer,
 	unsigned long sample_rate;
 	long nbytes = NeAACDecInit(decoder,
 				   /* deconst hack, libfaad requires this */
-				   const_cast<unsigned char *>(data),
-				   length,
+				   const_cast<unsigned char *>(data.data),
+				   data.size,
 				   &sample_rate, &channels);
 	if (nbytes < 0) {
 		error.Set(faad_decoder_domain, "Not an AAC stream");
 		return false;
 	}
 
-	decoder_buffer_consume(buffer, nbytes);
+	buffer.Consume(nbytes);
 
 	return audio_format_init_checked(audio_format, sample_rate,
 					 SampleFormat::S16, channels, error);
@@ -299,87 +277,57 @@ faad_decoder_init(NeAACDecHandle decoder, DecoderBuffer *buffer,
  * inconsistencies in libfaad.
  */
 static const void *
-faad_decoder_decode(NeAACDecHandle decoder, DecoderBuffer *buffer,
+faad_decoder_decode(NeAACDecHandle decoder, DecoderBuffer &buffer,
 		    NeAACDecFrameInfo *frame_info)
 {
-	size_t length;
-	const unsigned char *data = (const unsigned char *)
-		decoder_buffer_read(buffer, &length);
-	if (data == nullptr)
+	auto data = ConstBuffer<uint8_t>::FromVoid(buffer.Read());
+	if (data.IsEmpty())
 		return nullptr;
 
 	return NeAACDecDecode(decoder, frame_info,
 			      /* deconst hack, libfaad requires this */
-			      const_cast<unsigned char *>(data),
-			      length);
+			      const_cast<uint8_t *>(data.data),
+			      data.size);
 }
 
 /**
- * Get a song file's total playing time in seconds, as a float.
- * Returns 0 if the duration is unknown, and a negative value if the
- * file is invalid.
+ * Determine a song file's total playing time.
+ *
+ * The first return value specifies whether the file was recognized.
+ * The second return value is the duration.
  */
-static float
-faad_get_file_time_float(InputStream &is)
+static std::pair<bool, SignedSongTime>
+faad_get_file_time(InputStream &is)
 {
-	DecoderBuffer *const buffer =
-		decoder_buffer_new(nullptr, is,
-				   FAAD_MIN_STREAMSIZE * MAX_CHANNELS);
-
-	float length = faad_song_duration(buffer, is);
-
-	if (length < 0) {
-		AudioFormat audio_format;
+	DecoderBuffer buffer(nullptr, is,
+			     FAAD_MIN_STREAMSIZE * MAX_CHANNELS);
+	auto duration = faad_song_duration(buffer, is);
+	bool recognized = !duration.IsNegative();
 
+	if (!recognized) {
 		NeAACDecHandle decoder = faad_decoder_new();
 
-		decoder_buffer_fill(buffer);
+		buffer.Fill();
 
+		AudioFormat audio_format;
 		if (faad_decoder_init(decoder, buffer, audio_format,
 				      IgnoreError()))
-			length = 0;
+			recognized = true;
 
 		NeAACDecClose(decoder);
 	}
 
-	decoder_buffer_free(buffer);
-
-	return length;
-}
-
-/**
- * Get a song file's total playing time in seconds, as an int.
- * Returns 0 if the duration is unknown, and a negative value if the
- * file is invalid.
- */
-static int
-faad_get_file_time(InputStream &is)
-{
-	float length = faad_get_file_time_float(is);
-	if (length < 0)
-		return -1;
-
-	return int(length + 0.5);
+	return std::make_pair(recognized, duration);
 }
 
 static void
-faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
+faad_stream_decode(Decoder &mpd_decoder, InputStream &is,
+		   DecoderBuffer &buffer, const NeAACDecHandle decoder)
 {
-	DecoderBuffer *const buffer =
-		decoder_buffer_new(&mpd_decoder, is,
-				   FAAD_MIN_STREAMSIZE * MAX_CHANNELS);
-
-	const float total_time = faad_song_duration(buffer, is);
+	const auto total_time = faad_song_duration(buffer, is);
 
-	/* create the libfaad decoder */
-
-	const NeAACDecHandle decoder = faad_decoder_new();
-
-	while (!decoder_buffer_is_full(buffer) && !is.LockIsEOF() &&
-	       decoder_get_command(mpd_decoder) == DecoderCommand::NONE) {
-		adts_find_frame(buffer);
-		decoder_buffer_fill(buffer);
-	}
+	if (adts_find_frame(buffer) == 0)
+		return;
 
 	/* initialize it */
 
@@ -387,8 +335,6 @@ faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
 	AudioFormat audio_format;
 	if (!faad_decoder_init(decoder, buffer, audio_format, error)) {
 		LogError(error);
-		NeAACDecClose(decoder);
-		decoder_buffer_free(buffer);
 		return;
 	}
 
@@ -399,7 +345,7 @@ faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
 	/* the decoder loop */
 
 	DecoderCommand cmd;
-	uint16_t bit_rate = 0;
+	unsigned bit_rate = 0;
 	do {
 		/* find the next frame */
 
@@ -436,7 +382,7 @@ faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
 			break;
 		}
 
-		decoder_buffer_consume(buffer, frame_info.bytesconsumed);
+		buffer.Consume(frame_info.bytesconsumed);
 
 		/* update bit rate and position */
 
@@ -452,22 +398,36 @@ faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
 				   (size_t)frame_info.samples * 2,
 				   bit_rate);
 	} while (cmd != DecoderCommand::STOP);
+}
+
+static void
+faad_stream_decode(Decoder &mpd_decoder, InputStream &is)
+{
+	DecoderBuffer buffer(&mpd_decoder, is,
+			     FAAD_MIN_STREAMSIZE * MAX_CHANNELS);
+
+	/* create the libfaad decoder */
+
+	const NeAACDecHandle decoder = faad_decoder_new();
+
+	faad_stream_decode(mpd_decoder, is, buffer, decoder);
 
 	/* cleanup */
 
 	NeAACDecClose(decoder);
-	decoder_buffer_free(buffer);
 }
 
 static bool
 faad_scan_stream(InputStream &is,
 		 const struct tag_handler *handler, void *handler_ctx)
 {
-	int file_time = faad_get_file_time(is);
-	if (file_time < 0)
+	auto result = faad_get_file_time(is);
+	if (!result.first)
 		return false;
 
-	tag_handler_invoke_duration(handler, handler_ctx, file_time);
+	if (!result.second.IsNegative())
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    SongTime(result.second));
 	return true;
 }
 
@@ -476,7 +436,7 @@ static const char *const faad_mime_types[] = {
 	"audio/aac", "audio/aacp", nullptr
 };
 
-const struct DecoderPlugin faad_decoder_plugin = {
+const DecoderPlugin faad_decoder_plugin = {
 	"faad",
 	nullptr,
 	nullptr,
diff --git a/src/decoder/FaadDecoderPlugin.hxx b/src/decoder/plugins/FaadDecoderPlugin.hxx
index 817927d5e..968433e9b 100644
--- a/src/decoder/FaadDecoderPlugin.hxx
+++ b/src/decoder/plugins/FaadDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FfmpegDecoderPlugin.cxx b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
index 9a00bf3c4..722f954e2 100644
--- a/src/decoder/FfmpegDecoderPlugin.cxx
+++ b/src/decoder/plugins/FfmpegDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,10 +22,11 @@
 
 #include "config.h"
 #include "FfmpegDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "lib/ffmpeg/Domain.hxx"
+#include "../DecoderAPI.hxx"
 #include "FfmpegMetaData.hxx"
 #include "tag/TagHandler.hxx"
-#include "InputStream.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
@@ -47,8 +48,6 @@ extern "C" {
 #include <assert.h>
 #include <string.h>
 
-static constexpr Domain ffmpeg_domain("ffmpeg");
-
 /* suppress the ffmpeg compatibility macro */
 #ifdef SampleFormat
 #undef SampleFormat
@@ -120,13 +119,35 @@ mpd_ffmpeg_stream_seek(void *opaque, int64_t pos, int whence)
 {
 	AvioStream *stream = (AvioStream *)opaque;
 
-	if (whence == AVSEEK_SIZE)
-		return stream->input.size;
+	switch (whence) {
+	case SEEK_SET:
+		break;
+
+	case SEEK_CUR:
+		pos += stream->input.GetOffset();
+		break;
+
+	case SEEK_END:
+		if (!stream->input.KnownSize())
+			return -1;
 
-	if (!stream->input.LockSeek(pos, whence, IgnoreError()))
+		pos += stream->input.GetSize();
+		break;
+
+	case AVSEEK_SIZE:
+		if (!stream->input.KnownSize())
+			return -1;
+
+		return stream->input.GetSize();
+
+	default:
+		return -1;
+	}
+
+	if (!stream->input.LockSeek(pos, IgnoreError()))
 		return -1;
 
-	return stream->input.offset;
+	return stream->input.GetOffset();
 }
 
 bool
@@ -135,7 +156,7 @@ AvioStream::Open()
 	io = avio_alloc_context(buffer, sizeof(buffer),
 				false, this,
 				mpd_ffmpeg_stream_read, nullptr,
-				input.seekable
+				input.IsSeekable()
 				? mpd_ffmpeg_stream_seek : nullptr);
 	return io != nullptr;
 }
@@ -189,11 +210,19 @@ time_from_ffmpeg(int64_t t, const AVRational time_base)
 		/ (double)1024;
 }
 
+template<typename Ratio>
+static constexpr AVRational
+RatioToAVRational()
+{
+	return { Ratio::num, Ratio::den };
+}
+
 gcc_const
 static int64_t
-time_to_ffmpeg(double t, const AVRational time_base)
+time_to_ffmpeg(SongTime t, const AVRational time_base)
 {
-	return av_rescale_q((int64_t)(t * 1024), (AVRational){1, 1024},
+	return av_rescale_q(t.count(),
+			    RatioToAVRational<SongTime::period>(),
 			    time_base);
 }
 
@@ -345,6 +374,7 @@ ffmpeg_sample_format(enum AVSampleFormat sample_fmt)
 	case AV_SAMPLE_FMT_S32P:
 		return SampleFormat::S32;
 
+	case AV_SAMPLE_FMT_FLT:
 	case AV_SAMPLE_FMT_FLTP:
 		return SampleFormat::FLOAT;
 
@@ -394,7 +424,7 @@ ffmpeg_probe(Decoder *decoder, InputStream &is)
 
 	avpd.buf = buffer;
 	avpd.buf_size = nbytes;
-	avpd.filename = is.uri.c_str();
+	avpd.filename = is.GetURI();
 
 #ifdef AVPROBE_SCORE_MIME
 #if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(56, 5, 1)
@@ -430,7 +460,7 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
 	//ffmpeg works with ours "fileops" helper
 	AVFormatContext *format_context = nullptr;
 	if (mpd_ffmpeg_open_input(&format_context, stream.io,
-				  input.uri.c_str(),
+				  input.GetURI(),
 				  input_format) != 0) {
 		LogError(ffmpeg_domain, "Open failed");
 		return;
@@ -477,8 +507,11 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
 
 	const SampleFormat sample_format =
 		ffmpeg_sample_format(codec_context->sample_fmt);
-	if (sample_format == SampleFormat::UNDEFINED)
+	if (sample_format == SampleFormat::UNDEFINED) {
+		// (error message already done by ffmpeg_sample_format())
+		avformat_close_input(&format_context);
 		return;
+	}
 
 	Error error;
 	AudioFormat audio_format;
@@ -503,12 +536,14 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
 		return;
 	}
 
-	int total_time = format_context->duration != (int64_t)AV_NOPTS_VALUE
-		? format_context->duration / AV_TIME_BASE
-		: 0;
+	const SignedSongTime total_time =
+		format_context->duration != (int64_t)AV_NOPTS_VALUE
+		? SignedSongTime::FromScale<uint64_t>(format_context->duration,
+						      AV_TIME_BASE)
+		: SignedSongTime::Negative();
 
 	decoder_initialized(decoder, audio_format,
-			    input.seekable, total_time);
+			    input.IsSeekable(), total_time);
 
 #if LIBAVUTIL_VERSION_MAJOR >= 53
 	AVFrame *frame = av_frame_alloc();
@@ -544,7 +579,7 @@ ffmpeg_decode(Decoder &decoder, InputStream &input)
 
 		if (cmd == DecoderCommand::SEEK) {
 			int64_t where =
-				time_to_ffmpeg(decoder_seek_where(decoder),
+				time_to_ffmpeg(decoder_seek_time(decoder),
 					       av_stream->time_base) +
 				start_time_fallback(*av_stream);
 
@@ -585,7 +620,7 @@ ffmpeg_scan_stream(InputStream &is,
 		return false;
 
 	AVFormatContext *f = nullptr;
-	if (mpd_ffmpeg_open_input(&f, stream.io, is.uri.c_str(),
+	if (mpd_ffmpeg_open_input(&f, stream.io, is.GetURI(),
 				  input_format) != 0)
 		return false;
 
@@ -596,9 +631,12 @@ ffmpeg_scan_stream(InputStream &is,
 		return false;
 	}
 
-	if (f->duration != (int64_t)AV_NOPTS_VALUE)
-		tag_handler_invoke_duration(handler, handler_ctx,
-					    f->duration / AV_TIME_BASE);
+	if (f->duration != (int64_t)AV_NOPTS_VALUE) {
+		const auto duration =
+			SongTime::FromScale<uint64_t>(f->duration,
+						      AV_TIME_BASE);
+		tag_handler_invoke_duration(handler, handler_ctx, duration);
+	}
 
 	ffmpeg_scan_dictionary(f->metadata, handler, handler_ctx);
 	int idx = ffmpeg_find_audio_stream(f);
diff --git a/src/decoder/FfmpegDecoderPlugin.hxx b/src/decoder/plugins/FfmpegDecoderPlugin.hxx
index 23bf74fce..0a3e78e4b 100644
--- a/src/decoder/FfmpegDecoderPlugin.hxx
+++ b/src/decoder/plugins/FfmpegDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FfmpegMetaData.cxx b/src/decoder/plugins/FfmpegMetaData.cxx
index 6e92b4a13..a39466945 100644
--- a/src/decoder/FfmpegMetaData.cxx
+++ b/src/decoder/plugins/FfmpegMetaData.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FfmpegMetaData.hxx b/src/decoder/plugins/FfmpegMetaData.hxx
index 998cdf5a8..5eb41db68 100644
--- a/src/decoder/FfmpegMetaData.hxx
+++ b/src/decoder/plugins/FfmpegMetaData.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FlacCommon.cxx b/src/decoder/plugins/FlacCommon.cxx
index e4b906c12..e86f85569 100644
--- a/src/decoder/FlacCommon.cxx
+++ b/src/decoder/plugins/FlacCommon.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,14 +25,10 @@
 #include "FlacCommon.hxx"
 #include "FlacMetadata.hxx"
 #include "FlacPcm.hxx"
-#include "MixRampInfo.hxx"
 #include "CheckAudioFormat.hxx"
 #include "util/Error.hxx"
-#include "util/Domain.hxx"
 #include "Log.hxx"
 
-#include <assert.h>
-
 flac_data::flac_data(Decoder &_decoder,
 		     InputStream &_input_stream)
 	:FlacInput(_input_stream, &_decoder),
@@ -102,13 +98,14 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 		break;
 
 	case FLAC__METADATA_TYPE_VORBIS_COMMENT:
-		if (flac_parse_replay_gain(rgi, block))
+		if (flac_parse_replay_gain(rgi, block->data.vorbis_comment))
 			decoder_replay_gain(data->decoder, &rgi);
 
-		decoder_mixramp(data->decoder, flac_parse_mixramp(block));
+		decoder_mixramp(data->decoder,
+				flac_parse_mixramp(block->data.vorbis_comment));
 
-		flac_vorbis_comments_to_tag(data->tag,
-					    &block->data.vorbis_comment);
+		data->tag = flac_vorbis_comments_to_tag(&block->data.vorbis_comment);
+		break;
 
 	default:
 		break;
@@ -140,10 +137,12 @@ flac_got_first_frame(struct flac_data *data, const FLAC__FrameHeader *header)
 
 	data->frame_size = data->audio_format.GetFrameSize();
 
+	const auto duration = SongTime::FromScale<uint64_t>(data->total_frames,
+							    data->audio_format.sample_rate);
+
 	decoder_initialized(data->decoder, data->audio_format,
-			    data->input_stream.seekable,
-			    (float)data->total_frames /
-			    (float)data->audio_format.sample_rate);
+			    data->input_stream.IsSeekable(),
+			    duration);
 
 	data->initialized = true;
 
diff --git a/src/decoder/FlacCommon.hxx b/src/decoder/plugins/FlacCommon.hxx
index de000dfa1..34ce0a3fc 100644
--- a/src/decoder/FlacCommon.hxx
+++ b/src/decoder/plugins/FlacCommon.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,11 +25,10 @@
 #define MPD_FLAC_COMMON_HXX
 
 #include "FlacInput.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "pcm/PcmBuffer.hxx"
 
 #include <FLAC/stream_decoder.h>
-#include <FLAC/metadata.h>
 
 struct flac_data : public FlacInput {
 	PcmBuffer buffer;
diff --git a/src/decoder/FlacDecoderPlugin.cxx b/src/decoder/plugins/FlacDecoderPlugin.cxx
index 1b5734434..eea813401 100644
--- a/src/decoder/FlacDecoderPlugin.cxx
+++ b/src/decoder/plugins/FlacDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,13 +23,10 @@
 #include "FlacCommon.hxx"
 #include "FlacMetadata.hxx"
 #include "OggCodec.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
-
-#include <assert.h>
-
 #if !defined(FLAC_API_VERSION_CURRENT) || FLAC_API_VERSION_CURRENT <= 7
 #error libFLAC is too old
 #endif
@@ -83,11 +80,11 @@ flac_write_cb(const FLAC__StreamDecoder *dec, const FLAC__Frame *frame,
 }
 
 static bool
-flac_scan_file(const char *file,
+flac_scan_file(Path path_fs,
 	       const struct tag_handler *handler, void *handler_ctx)
 {
 	FlacMetadataChain chain;
-	if (!chain.Read(file)) {
+	if (!chain.Read(path_fs.c_str())) {
 		FormatDebug(flac_domain,
 			    "Failed to read FLAC tags: %s",
 			    chain.GetStatusString());
@@ -147,14 +144,18 @@ flac_decoder_initialize(struct flac_data *data, FLAC__StreamDecoder *sd,
 
 	if (data->initialized) {
 		/* done */
+
+		const auto duration2 =
+			SongTime::FromScale<uint64_t>(data->total_frames,
+						      data->audio_format.sample_rate);
+
 		decoder_initialized(data->decoder, data->audio_format,
-				    data->input_stream.seekable,
-				    (float)data->total_frames /
-				    (float)data->audio_format.sample_rate);
+				    data->input_stream.IsSeekable(),
+				    duration2);
 		return true;
 	}
 
-	if (data->input_stream.seekable)
+	if (data->input_stream.IsSeekable())
 		/* allow the workaround below only for nonseekable
 		   streams*/
 		return false;
@@ -184,8 +185,7 @@ flac_decoder_loop(struct flac_data *data, FLAC__StreamDecoder *flac_dec,
 
 		if (cmd == DecoderCommand::SEEK) {
 			FLAC__uint64 seek_sample = t_start +
-				decoder_seek_where(decoder) *
-				data->audio_format.sample_rate;
+				decoder_seek_where_frame(decoder);
 			if (seek_sample >= t_start &&
 			    (t_end == 0 || seek_sample <= t_end) &&
 			    FLAC__stream_decoder_seek_absolute(flac_dec, seek_sample)) {
@@ -297,11 +297,11 @@ oggflac_init(gcc_unused const config_param &param)
 }
 
 static bool
-oggflac_scan_file(const char *file,
+oggflac_scan_file(Path path_fs,
 		  const struct tag_handler *handler, void *handler_ctx)
 {
 	FlacMetadataChain chain;
-	if (!chain.ReadOgg(file)) {
+	if (!chain.ReadOgg(path_fs.c_str())) {
 		FormatDebug(flac_domain,
 			    "Failed to read OggFLAC tags: %s",
 			    chain.GetStatusString());
diff --git a/src/decoder/FlacDecoderPlugin.h b/src/decoder/plugins/FlacDecoderPlugin.h
index 936423fbf..fcdecf869 100644
--- a/src/decoder/FlacDecoderPlugin.h
+++ b/src/decoder/plugins/FlacDecoderPlugin.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FlacDomain.cxx b/src/decoder/plugins/FlacDomain.cxx
index 5858004de..fc5cc5498 100644
--- a/src/decoder/FlacDomain.cxx
+++ b/src/decoder/plugins/FlacDomain.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FlacDomain.hxx b/src/decoder/plugins/FlacDomain.hxx
index cf357332f..a06c6c6b4 100644
--- a/src/decoder/FlacDomain.hxx
+++ b/src/decoder/plugins/FlacDomain.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FlacIOHandle.cxx b/src/decoder/plugins/FlacIOHandle.cxx
index b471ecf64..0dd895798 100644
--- a/src/decoder/FlacIOHandle.cxx
+++ b/src/decoder/plugins/FlacIOHandle.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,6 +23,7 @@
 #include "Compiler.h"
 
 #include <errno.h>
+#include <stdio.h>
 
 static size_t
 FlacIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
@@ -62,12 +63,31 @@ FlacIORead(void *ptr, size_t size, size_t nmemb, FLAC__IOHandle handle)
 }
 
 static int
-FlacIOSeek(FLAC__IOHandle handle, FLAC__int64 offset, int whence)
+FlacIOSeek(FLAC__IOHandle handle, FLAC__int64 _offset, int whence)
 {
 	InputStream *is = (InputStream *)handle;
 
-	Error error;
-	return is->LockSeek(offset, whence, error) ? 0 : -1;
+	offset_type offset = _offset;
+	switch (whence) {
+	case SEEK_SET:
+		break;
+
+	case SEEK_CUR:
+		offset += is->GetOffset();
+		break;
+
+	case SEEK_END:
+		if (!is->KnownSize())
+			return -1;
+
+		offset += is->GetSize();
+		break;
+
+	default:
+		return -1;
+	}
+
+	return is->LockSeek(offset, IgnoreError()) ? 0 : -1;
 }
 
 static FLAC__int64
@@ -75,7 +95,7 @@ FlacIOTell(FLAC__IOHandle handle)
 {
 	InputStream *is = (InputStream *)handle;
 
-	return is->offset;
+	return is->GetOffset();
 }
 
 static int
diff --git a/src/decoder/FlacIOHandle.hxx b/src/decoder/plugins/FlacIOHandle.hxx
index b6e563fa3..90acc66af 100644
--- a/src/decoder/FlacIOHandle.hxx
+++ b/src/decoder/plugins/FlacIOHandle.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,7 +21,7 @@
 #define MPD_FLAC_IO_HANDLE_HXX
 
 #include "Compiler.h"
-#include "InputStream.hxx"
+#include "input/InputStream.hxx"
 
 #include <FLAC/callback.h>
 
@@ -37,7 +37,7 @@ ToFlacIOHandle(InputStream &is)
 static inline const FLAC__IOCallbacks &
 GetFlacIOCallbacks(const InputStream &is)
 {
-	return is.seekable
+	return is.IsSeekable()
 		? flac_io_callbacks_seekable
 		: flac_io_callbacks;
 }
diff --git a/src/decoder/FlacInput.cxx b/src/decoder/plugins/FlacInput.cxx
index ce193101d..5b4c3104d 100644
--- a/src/decoder/FlacInput.cxx
+++ b/src/decoder/plugins/FlacInput.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,8 +20,8 @@
 #include "config.h"
 #include "FlacInput.hxx"
 #include "FlacDomain.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
 #include "Compiler.h"
@@ -47,11 +47,11 @@ FlacInput::Read(FLAC__byte buffer[], size_t *bytes)
 FLAC__StreamDecoderSeekStatus
 FlacInput::Seek(FLAC__uint64 absolute_byte_offset)
 {
-	if (!input_stream.seekable)
+	if (!input_stream.IsSeekable())
 		return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED;
 
 	::Error error;
-	if (!input_stream.LockSeek(absolute_byte_offset, SEEK_SET, error)) {
+	if (!input_stream.LockSeek(absolute_byte_offset, error)) {
 		LogError(error);
 		return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
 	}
@@ -62,20 +62,20 @@ FlacInput::Seek(FLAC__uint64 absolute_byte_offset)
 FLAC__StreamDecoderTellStatus
 FlacInput::Tell(FLAC__uint64 *absolute_byte_offset)
 {
-	if (!input_stream.seekable)
+	if (!input_stream.IsSeekable())
 		return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED;
 
-	*absolute_byte_offset = (FLAC__uint64)input_stream.offset;
+	*absolute_byte_offset = (FLAC__uint64)input_stream.GetOffset();
 	return FLAC__STREAM_DECODER_TELL_STATUS_OK;
 }
 
 FLAC__StreamDecoderLengthStatus
 FlacInput::Length(FLAC__uint64 *stream_length)
 {
-	if (input_stream.size < 0)
+	if (!input_stream.KnownSize())
 		return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED;
 
-	*stream_length = (FLAC__uint64)input_stream.size;
+	*stream_length = (FLAC__uint64)input_stream.GetSize();
 	return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
 }
 
diff --git a/src/decoder/FlacInput.hxx b/src/decoder/plugins/FlacInput.hxx
index ddd5649f8..427abccb4 100644
--- a/src/decoder/FlacInput.hxx
+++ b/src/decoder/plugins/FlacInput.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,7 +23,7 @@
 #include <FLAC/stream_decoder.h>
 
 struct Decoder;
-struct InputStream;
+class InputStream;
 
 /**
  * This class wraps an #InputStream in libFLAC stream decoder
diff --git a/src/decoder/FlacMetadata.cxx b/src/decoder/plugins/FlacMetadata.cxx
index 17cc4cd8d..03e276dce 100644
--- a/src/decoder/FlacMetadata.cxx
+++ b/src/decoder/plugins/FlacMetadata.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,122 +21,56 @@
 #include "FlacMetadata.hxx"
 #include "XiphTags.hxx"
 #include "MixRampInfo.hxx"
-#include "tag/Tag.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagTable.hxx"
 #include "tag/TagBuilder.hxx"
+#include "tag/Tag.hxx"
+#include "tag/VorbisComment.hxx"
+#include "tag/ReplayGain.hxx"
+#include "tag/MixRamp.hxx"
 #include "ReplayGainInfo.hxx"
 #include "util/ASCII.hxx"
-
-#include <glib.h>
-
-#include <assert.h>
-#include <string.h>
-
-static bool
-flac_find_float_comment(const FLAC__StreamMetadata *block,
-			const char *cmnt, float *fl)
-{
-	int offset;
-	size_t pos;
-	int len;
-	unsigned char tmp, *p;
-
-	offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
-								     cmnt);
-	if (offset < 0)
-		return false;
-
-	pos = strlen(cmnt) + 1; /* 1 is for '=' */
-	len = block->data.vorbis_comment.comments[offset].length - pos;
-	if (len <= 0)
-		return false;
-
-	p = &block->data.vorbis_comment.comments[offset].entry[pos];
-	tmp = p[len];
-	p[len] = '\0';
-	*fl = (float)atof((char *)p);
-	p[len] = tmp;
-
-	return true;
-}
+#include "util/SplitString.hxx"
 
 bool
 flac_parse_replay_gain(ReplayGainInfo &rgi,
-		       const FLAC__StreamMetadata *block)
+		       const FLAC__StreamMetadata_VorbisComment &vc)
 {
 	rgi.Clear();
 
 	bool found = false;
-	if (flac_find_float_comment(block, "replaygain_album_gain",
-				    &rgi.tuples[REPLAY_GAIN_ALBUM].gain))
-		found = true;
-	if (flac_find_float_comment(block, "replaygain_album_peak",
-				    &rgi.tuples[REPLAY_GAIN_ALBUM].peak))
-		found = true;
-	if (flac_find_float_comment(block, "replaygain_track_gain",
-				    &rgi.tuples[REPLAY_GAIN_TRACK].gain))
-		found = true;
-	if (flac_find_float_comment(block, "replaygain_track_peak",
-				    &rgi.tuples[REPLAY_GAIN_TRACK].peak))
-		found = true;
 
-	return found;
-}
+	const auto *comments = vc.comments;
+	for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
+		if (ParseReplayGainVorbis(rgi,
+					  (const char *)comments[i].entry))
+			found = true;
 
-gcc_pure
-static std::string
-flac_find_string_comment(const FLAC__StreamMetadata *block, const char *cmnt)
-{
-	int offset;
-	size_t pos;
-	int len;
-	const unsigned char *p;
-
-	offset = FLAC__metadata_object_vorbiscomment_find_entry_from(block, 0,
-								     cmnt);
-	if (offset < 0)
-		return std::string();
-
-	pos = strlen(cmnt) + 1; /* 1 is for '=' */
-	len = block->data.vorbis_comment.comments[offset].length - pos;
-	if (len <= 0)
-		return std::string();
-
-	p = &block->data.vorbis_comment.comments[offset].entry[pos];
-	return std::string((const char *)p, len);
+	return found;
 }
 
 MixRampInfo
-flac_parse_mixramp(const FLAC__StreamMetadata *block)
+flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc)
 {
 	MixRampInfo mix_ramp;
-	mix_ramp.SetStart(flac_find_string_comment(block, "mixramp_start"));
-	mix_ramp.SetEnd(flac_find_string_comment(block, "mixramp_end"));
+
+	const auto *comments = vc.comments;
+	for (FLAC__uint32 i = 0, n = vc.num_comments; i < n; ++i)
+		ParseMixRampVorbis(mix_ramp,
+				   (const char *)comments[i].entry);
+
 	return mix_ramp;
 }
 
 /**
  * Checks if the specified name matches the entry's name, and if yes,
- * returns the comment value (not null-temrinated).
+ * returns the comment value;
  */
 static const char *
 flac_comment_value(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
-		   const char *name, size_t *length_r)
+		   const char *name)
 {
-	size_t name_length = strlen(name);
-	const char *comment = (const char*)entry->entry;
-
-	if (entry->length <= name_length ||
-	    !StringEqualsCaseASCII(comment, name, name_length))
-		return nullptr;
-
-	if (comment[name_length] == '=') {
-		*length_r = entry->length - name_length - 1;
-		return comment + name_length + 1;
-	}
-
-	return nullptr;
+	return vorbis_comment_value((const char *)entry->entry, name);
 }
 
 /**
@@ -148,14 +82,9 @@ flac_copy_comment(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
 		  const char *name, TagType tag_type,
 		  const struct tag_handler *handler, void *handler_ctx)
 {
-	const char *value;
-	size_t value_length;
-
-	value = flac_comment_value(entry, name, &value_length);
+	const char *value = flac_comment_value(entry, name);
 	if (value != nullptr) {
-		char *p = g_strndup(value, value_length);
-		tag_handler_invoke_tag(handler, handler_ctx, tag_type, p);
-		g_free(p);
+		tag_handler_invoke_tag(handler, handler_ctx, tag_type, value);
 		return true;
 	}
 
@@ -167,16 +96,12 @@ flac_scan_comment(const FLAC__StreamMetadata_VorbisComment_Entry *entry,
 		  const struct tag_handler *handler, void *handler_ctx)
 {
 	if (handler->pair != nullptr) {
-		char *name = g_strdup((const char*)entry->entry);
-		char *value = strchr(name, '=');
-
-		if (value != nullptr && value > name) {
-			*value++ = 0;
+		const char *comment = (const char *)entry->entry;
+		const SplitString split(comment, '=');
+		if (split.IsDefined() && !split.IsEmpty())
 			tag_handler_invoke_pair(handler, handler_ctx,
-						name, value);
-		}
-
-		g_free(name);
+						split.GetFirst(),
+						split.GetSecond());
 	}
 
 	for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i)
@@ -200,6 +125,16 @@ flac_scan_comments(const FLAC__StreamMetadata_VorbisComment *comment,
 				  handler, handler_ctx);
 }
 
+gcc_pure
+static inline SongTime
+flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
+{
+	assert(stream_info->sample_rate > 0);
+
+	return SongTime::FromScale<uint64_t>(stream_info->total_samples,
+					     stream_info->sample_rate);
+}
+
 void
 flac_scan_metadata(const FLAC__StreamMetadata *block,
 		   const struct tag_handler *handler, void *handler_ctx)
@@ -221,13 +156,12 @@ flac_scan_metadata(const FLAC__StreamMetadata *block,
 	}
 }
 
-void
-flac_vorbis_comments_to_tag(Tag &tag,
-			    const FLAC__StreamMetadata_VorbisComment *comment)
+Tag
+flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment)
 {
 	TagBuilder tag_builder;
 	flac_scan_comments(comment, &add_tag_handler, &tag_builder);
-	tag_builder.Commit(tag);
+	return tag_builder.Commit();
 }
 
 void
diff --git a/src/decoder/FlacMetadata.hxx b/src/decoder/plugins/FlacMetadata.hxx
index 96c61b8e6..d791fa34e 100644
--- a/src/decoder/FlacMetadata.hxx
+++ b/src/decoder/plugins/FlacMetadata.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -27,6 +27,7 @@
 
 #include <assert.h>
 
+struct tag_handler;
 class MixRampInfo;
 
 class FlacMetadataChain {
@@ -81,7 +82,7 @@ public:
 		return FLAC__Metadata_ChainStatusString[GetStatus()];
 	}
 
-	void Scan(const struct tag_handler *handler, void *handler_ctx);
+	void Scan(const tag_handler *handler, void *handler_ctx);
 };
 
 class FLACMetadataIterator {
@@ -110,32 +111,21 @@ public:
 	}
 };
 
-struct tag_handler;
 struct Tag;
 struct ReplayGainInfo;
 
-static inline unsigned
-flac_duration(const FLAC__StreamMetadata_StreamInfo *stream_info)
-{
-	assert(stream_info->sample_rate > 0);
-
-	return (stream_info->total_samples + stream_info->sample_rate - 1) /
-		stream_info->sample_rate;
-}
-
 bool
 flac_parse_replay_gain(ReplayGainInfo &rgi,
-		       const FLAC__StreamMetadata *block);
+		       const FLAC__StreamMetadata_VorbisComment &vc);
 
 MixRampInfo
-flac_parse_mixramp(const FLAC__StreamMetadata *block);
+flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc);
 
-void
-flac_vorbis_comments_to_tag(Tag &tag,
-			    const FLAC__StreamMetadata_VorbisComment *comment);
+Tag
+flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment);
 
 void
 flac_scan_metadata(const FLAC__StreamMetadata *block,
-		   const struct tag_handler *handler, void *handler_ctx);
+		   const tag_handler *handler, void *handler_ctx);
 
 #endif
diff --git a/src/decoder/FlacPcm.cxx b/src/decoder/plugins/FlacPcm.cxx
index 569879371..311500f26 100644
--- a/src/decoder/FlacPcm.cxx
+++ b/src/decoder/plugins/FlacPcm.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FlacPcm.hxx b/src/decoder/plugins/FlacPcm.hxx
index 6cb2d5062..30c318725 100644
--- a/src/decoder/FlacPcm.hxx
+++ b/src/decoder/plugins/FlacPcm.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/FluidsynthDecoderPlugin.cxx b/src/decoder/plugins/FluidsynthDecoderPlugin.cxx
index fa946f219..f19ac5bf4 100644
--- a/src/decoder/FluidsynthDecoderPlugin.cxx
+++ b/src/decoder/plugins/FluidsynthDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,8 +19,9 @@
 
 #include "config.h"
 #include "FluidsynthDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "CheckAudioFormat.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "util/Macros.hxx"
@@ -92,7 +93,7 @@ fluidsynth_init(const config_param &param)
 }
 
 static void
-fluidsynth_file_decode(Decoder &decoder, const char *path_fs)
+fluidsynth_file_decode(Decoder &decoder, Path path_fs)
 {
 	char setting_sample_rate[] = "synth.sample-rate";
 	/*
@@ -141,7 +142,7 @@ fluidsynth_file_decode(Decoder &decoder, const char *path_fs)
 		return;
 	}
 
-	ret = fluid_player_add(player, path_fs);
+	ret = fluid_player_add(player, path_fs.c_str());
 	if (ret != 0) {
 		LogWarning(fluidsynth_domain, "fluid_player_add() failed");
 		delete_fluid_player(player);
@@ -165,7 +166,8 @@ fluidsynth_file_decode(Decoder &decoder, const char *path_fs)
 	   MPD core */
 
 	const AudioFormat audio_format(sample_rate, SampleFormat::S16, 2);
-	decoder_initialized(decoder, audio_format, false, -1);
+	decoder_initialized(decoder, audio_format, false,
+			    SignedSongTime::Negative());
 
 	DecoderCommand cmd;
 	while (fluid_player_get_status(player) == FLUID_PLAYER_PLAYING) {
@@ -198,11 +200,11 @@ fluidsynth_file_decode(Decoder &decoder, const char *path_fs)
 }
 
 static bool
-fluidsynth_scan_file(const char *file,
+fluidsynth_scan_file(Path path_fs,
 		     gcc_unused const struct tag_handler *handler,
 		     gcc_unused void *handler_ctx)
 {
-	return fluid_is_midifile(file);
+	return fluid_is_midifile(path_fs.c_str());
 }
 
 static const char *const fluidsynth_suffixes[] = {
diff --git a/src/decoder/FluidsynthDecoderPlugin.hxx b/src/decoder/plugins/FluidsynthDecoderPlugin.hxx
index 9771898a5..cd8ec2d62 100644
--- a/src/decoder/FluidsynthDecoderPlugin.hxx
+++ b/src/decoder/plugins/FluidsynthDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/GmeDecoderPlugin.cxx b/src/decoder/plugins/GmeDecoderPlugin.cxx
index 9c9b19478..cc6ce5e5d 100644
--- a/src/decoder/GmeDecoderPlugin.cxx
+++ b/src/decoder/plugins/GmeDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,9 +19,11 @@
 
 #include "config.h"
 #include "GmeDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
+#include "fs/Path.hxx"
+#include "util/Alloc.hxx"
 #include "util/FormatString.hxx"
 #include "util/UriUtil.hxx"
 #include "util/Error.hxx"
@@ -50,10 +52,10 @@ static constexpr unsigned GME_BUFFER_SAMPLES =
  * suffix
  */
 static char *
-get_container_name(const char *path_fs)
+get_container_name(Path path_fs)
 {
-	const char *subtune_suffix = uri_get_suffix(path_fs);
-	char *path_container = g_strdup(path_fs);
+	const char *subtune_suffix = uri_get_suffix(path_fs.c_str());
+	char *path_container = xstrdup(path_fs.c_str());
 
 	char pat[64];
 	snprintf(pat, sizeof(pat), "%s%s",
@@ -79,9 +81,9 @@ get_container_name(const char *path_fs)
  * is appended.
  */
 static int
-get_song_num(const char *path_fs)
+get_song_num(Path path_fs)
 {
-	const char *subtune_suffix = uri_get_suffix(path_fs);
+	const char *subtune_suffix = uri_get_suffix(path_fs.c_str());
 
 	char pat[64];
 	snprintf(pat, sizeof(pat), "%s%s",
@@ -90,8 +92,8 @@ get_song_num(const char *path_fs)
 	GPatternSpec *path_with_subtune = g_pattern_spec_new(pat);
 
 	if (g_pattern_match(path_with_subtune,
-			    strlen(path_fs), path_fs, nullptr)) {
-		char *sub = g_strrstr(path_fs, "/" SUBTUNE_PREFIX);
+			    path_fs.length(), path_fs.data(), nullptr)) {
+		char *sub = g_strrstr(path_fs.c_str(), "/" SUBTUNE_PREFIX);
 		g_pattern_spec_free(path_with_subtune);
 		if (!sub)
 			return 0;
@@ -107,10 +109,11 @@ get_song_num(const char *path_fs)
 }
 
 static char *
-gme_container_scan(const char *path_fs, const unsigned int tnum)
+gme_container_scan(Path path_fs, const unsigned int tnum)
 {
 	Music_Emu *emu;
-	const char *gme_err = gme_open_file(path_fs, &emu, GME_SAMPLE_RATE);
+	const char *gme_err = gme_open_file(path_fs.c_str(), &emu,
+					    GME_SAMPLE_RATE);
 	if (gme_err != nullptr) {
 		LogWarning(gme_domain, gme_err);
 		return nullptr;
@@ -122,7 +125,7 @@ gme_container_scan(const char *path_fs, const unsigned int tnum)
 	if (num_songs < 2)
 		return nullptr;
 
-	const char *subtune_suffix = uri_get_suffix(path_fs);
+	const char *subtune_suffix = uri_get_suffix(path_fs.c_str());
 	if (tnum <= num_songs){
 		return FormatNew(SUBTUNE_PREFIX "%03u.%s",
 				 tnum, subtune_suffix);
@@ -131,14 +134,14 @@ gme_container_scan(const char *path_fs, const unsigned int tnum)
 }
 
 static void
-gme_file_decode(Decoder &decoder, const char *path_fs)
+gme_file_decode(Decoder &decoder, Path path_fs)
 {
 	char *path_container = get_container_name(path_fs);
 
 	Music_Emu *emu;
 	const char *gme_err =
 		gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
-	g_free(path_container);
+	free(path_container);
 	if (gme_err != nullptr) {
 		LogWarning(gme_domain, gme_err);
 		return;
@@ -153,9 +156,9 @@ gme_file_decode(Decoder &decoder, const char *path_fs)
 		return;
 	}
 
-	const float song_len = ti->length > 0
-		? ti->length / 1000.0
-		: -1.0;
+	const SignedSongTime song_len = ti->length > 0
+		? SignedSongTime::FromMS(ti->length)
+		: SignedSongTime::Negative();
 
 	/* initialize the MPD decoder */
 
@@ -191,8 +194,8 @@ gme_file_decode(Decoder &decoder, const char *path_fs)
 
 		cmd = decoder_data(decoder, nullptr, buf, sizeof(buf), 0);
 		if (cmd == DecoderCommand::SEEK) {
-			float where = decoder_seek_where(decoder);
-			gme_err = gme_seek(emu, int(where * 1000));
+			unsigned where = decoder_seek_time(decoder).ToMS();
+			gme_err = gme_seek(emu, where);
 			if (gme_err != nullptr)
 				LogWarning(gme_domain, gme_err);
 			decoder_command_finished(decoder);
@@ -207,7 +210,7 @@ gme_file_decode(Decoder &decoder, const char *path_fs)
 }
 
 static bool
-gme_scan_file(const char *path_fs,
+gme_scan_file(Path path_fs,
 	      const struct tag_handler *handler, void *handler_ctx)
 {
 	char *path_container = get_container_name(path_fs);
@@ -215,7 +218,7 @@ gme_scan_file(const char *path_fs,
 	Music_Emu *emu;
 	const char *gme_err =
 		gme_open_file(path_container, &emu, GME_SAMPLE_RATE);
-	g_free(path_container);
+	free(path_container);
 	if (gme_err != nullptr) {
 		LogWarning(gme_domain, gme_err);
 		return false;
@@ -235,7 +238,7 @@ gme_scan_file(const char *path_fs,
 
 	if (ti->length > 0)
 		tag_handler_invoke_duration(handler, handler_ctx,
-					    ti->length / 1000);
+					    SongTime::FromMS(ti->length));
 
 	if (ti->song != nullptr) {
 		if (gme_track_count(emu) > 1) {
diff --git a/src/decoder/GmeDecoderPlugin.hxx b/src/decoder/plugins/GmeDecoderPlugin.hxx
index e46dc766a..f4885b6e4 100644
--- a/src/decoder/GmeDecoderPlugin.hxx
+++ b/src/decoder/plugins/GmeDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/MadDecoderPlugin.cxx b/src/decoder/plugins/MadDecoderPlugin.cxx
index 6f619b34b..de6c9b127 100644
--- a/src/decoder/MadDecoderPlugin.cxx
+++ b/src/decoder/plugins/MadDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,33 +19,33 @@
 
 #include "config.h"
 #include "MadDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
-#include "ConfigGlobal.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
+#include "config/ConfigGlobal.hxx"
 #include "tag/TagId3.hxx"
 #include "tag/TagRva2.hxx"
 #include "tag/TagHandler.hxx"
+#include "tag/ReplayGain.hxx"
+#include "tag/MixRamp.hxx"
 #include "CheckAudioFormat.hxx"
+#include "util/StringUtil.hxx"
 #include "util/ASCII.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
-#include <assert.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#include <glib.h>
 #include <mad.h>
 
 #ifdef HAVE_ID3TAG
 #include <id3tag.h>
 #endif
 
-#define FRAMES_CUSHION    2000
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 
-#define READ_BUFFER_SIZE  40960
+static constexpr unsigned long FRAMES_CUSHION = 2000;
 
 enum mp3_action {
 	DECODE_SKIP = -3,
@@ -61,22 +61,27 @@ enum muteframe {
 };
 
 /* the number of samples of silence the decoder inserts at start */
-#define DECODERDELAY 529
+static constexpr unsigned DECODERDELAY = 529;
 
-#define DEFAULT_GAPLESS_MP3_PLAYBACK true
+static constexpr bool DEFAULT_GAPLESS_MP3_PLAYBACK = true;
 
 static constexpr Domain mad_domain("mad");
 
 static bool gapless_playback;
 
+gcc_const
+static SongTime
+ToSongTime(mad_timer_t t)
+{
+	return SongTime::FromMS(mad_timer_count(t, MAD_UNITS_MILLISECONDS));
+}
+
 static inline int32_t
 mad_fixed_to_24_sample(mad_fixed_t sample)
 {
-	enum {
-		bits = 24,
-		MIN = -MAD_F_ONE,
-		MAX = MAD_F_ONE - 1
-	};
+	static constexpr unsigned bits = 24;
+	static constexpr mad_fixed_t MIN = -MAD_F_ONE;
+	static constexpr mad_fixed_t MAX = MAD_F_ONE - 1;
 
 	/* round */
 	sample = sample + (1L << (MAD_F_FRACBITS - bits));
@@ -96,12 +101,9 @@ mad_fixed_to_24_buffer(int32_t *dest, const struct mad_synth *synth,
 		       unsigned int start, unsigned int end,
 		       unsigned int num_channels)
 {
-	unsigned int i, c;
-
-	for (i = start; i < end; ++i) {
-		for (c = 0; c < num_channels; ++c)
+	for (unsigned i = start; i < end; ++i)
+		for (unsigned c = 0; c < num_channels; ++c)
 			*dest++ = mad_fixed_to_24_sample(synth->pcm.samples[c][i]);
-	}
 }
 
 static bool
@@ -112,18 +114,19 @@ mp3_plugin_init(gcc_unused const config_param &param)
 	return true;
 }
 
-#define MP3_DATA_OUTPUT_BUFFER_SIZE 2048
-
 struct MadDecoder {
+	static constexpr size_t READ_BUFFER_SIZE = 40960;
+	static constexpr size_t MP3_DATA_OUTPUT_BUFFER_SIZE = 2048;
+
 	struct mad_stream stream;
 	struct mad_frame frame;
 	struct mad_synth synth;
 	mad_timer_t timer;
 	unsigned char input_buffer[READ_BUFFER_SIZE];
 	int32_t output_buffer[MP3_DATA_OUTPUT_BUFFER_SIZE];
-	float total_time;
-	float elapsed_time;
-	float seek_where;
+	SignedSongTime total_time;
+	SongTime elapsed_time;
+	SongTime seek_time;
 	enum muteframe mute_frame;
 	long *frame_offsets;
 	mad_timer_t *times;
@@ -135,7 +138,6 @@ struct MadDecoder {
 	unsigned int drop_start_samples;
 	unsigned int drop_end_samples;
 	bool found_replay_gain;
-	bool found_xing;
 	bool found_first_frame;
 	bool decoded_first_frame;
 	unsigned long bit_rate;
@@ -153,10 +155,10 @@ struct MadDecoder {
 	enum mp3_action DecodeNextFrame();
 
 	gcc_pure
-	InputStream::offset_type ThisFrameOffset() const;
+	offset_type ThisFrameOffset() const;
 
 	gcc_pure
-	InputStream::offset_type RestIncludingThisFrame() const;
+	offset_type RestIncludingThisFrame() const;
 
 	/**
 	 * Attempt to calulcate the length of the song from filesize
@@ -166,7 +168,7 @@ struct MadDecoder {
 	bool DecodeFirstFrame(Tag **tag);
 
 	gcc_pure
-	long TimeToFrame(double t) const;
+	long TimeToFrame(SongTime t) const;
 
 	void UpdateTimerNextFrame();
 
@@ -192,7 +194,7 @@ MadDecoder::MadDecoder(Decoder *_decoder,
 	 highest_frame(0), max_frames(0), current_frame(0),
 	 drop_start_frames(0), drop_end_frames(0),
 	 drop_start_samples(0), drop_end_samples(0),
-	 found_replay_gain(false), found_xing(false),
+	 found_replay_gain(false),
 	 found_first_frame(false), decoded_first_frame(false),
 	 decoder(_decoder), input_stream(_input_stream),
 	 layer(mad_layer(0))
@@ -208,7 +210,7 @@ inline bool
 MadDecoder::Seek(long offset)
 {
 	Error error;
-	if (!input_stream.LockSeek(offset, SEEK_SET, error))
+	if (!input_stream.LockSeek(offset, error))
 		return false;
 
 	mad_stream_buffer(&stream, input_buffer, 0);
@@ -254,38 +256,24 @@ static bool
 parse_id3_replay_gain_info(ReplayGainInfo &rgi,
 			   struct id3_tag *tag)
 {
-	int i;
-	char *key;
-	char *value;
-	struct id3_frame *frame;
 	bool found = false;
 
 	rgi.Clear();
 
-	for (i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
+	struct id3_frame *frame;
+	for (unsigned i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
 		if (frame->nfields < 3)
 			continue;
 
-		key = (char *)
+		char *const key = (char *)
 		    id3_ucs4_latin1duplicate(id3_field_getstring
 					     (&frame->fields[1]));
-		value = (char *)
+		char *const value = (char *)
 		    id3_ucs4_latin1duplicate(id3_field_getstring
 					     (&frame->fields[2]));
 
-		if (StringEqualsCaseASCII(key, "replaygain_track_gain")) {
-			rgi.tuples[REPLAY_GAIN_TRACK].gain = atof(value);
-			found = true;
-		} else if (StringEqualsCaseASCII(key, "replaygain_album_gain")) {
-			rgi.tuples[REPLAY_GAIN_ALBUM].gain = atof(value);
-			found = true;
-		} else if (StringEqualsCaseASCII(key, "replaygain_track_peak")) {
-			rgi.tuples[REPLAY_GAIN_TRACK].peak = atof(value);
+		if (ParseReplayGainTag(rgi, key, value))
 			found = true;
-		} else if (StringEqualsCaseASCII(key, "replaygain_album_peak")) {
-			rgi.tuples[REPLAY_GAIN_ALBUM].peak = atof(value);
-			found = true;
-		}
 
 		free(key);
 		free(value);
@@ -302,29 +290,21 @@ gcc_pure
 static MixRampInfo
 parse_id3_mixramp(struct id3_tag *tag)
 {
-	int i;
-	char *key;
-	char *value;
-	struct id3_frame *frame;
-
 	MixRampInfo result;
 
-	for (i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
+	struct id3_frame *frame;
+	for (unsigned i = 0; (frame = id3_tag_findframe(tag, "TXXX", i)); i++) {
 		if (frame->nfields < 3)
 			continue;
 
-		key = (char *)
+		char *const key = (char *)
 		    id3_ucs4_latin1duplicate(id3_field_getstring
 					     (&frame->fields[1]));
-		value = (char *)
+		char *const value = (char *)
 		    id3_ucs4_latin1duplicate(id3_field_getstring
 					     (&frame->fields[2]));
 
-		if (StringEqualsCaseASCII(key, "mixramp_start")) {
-			result.SetStart(value);
-		} else if (StringEqualsCaseASCII(key, "mixramp_end")) {
-			result.SetEnd(value);
-		}
+		ParseMixRampTag(result, key, value);
 
 		free(key);
 		free(value);
@@ -338,34 +318,32 @@ inline void
 MadDecoder::ParseId3(size_t tagsize, Tag **mpd_tag)
 {
 #ifdef HAVE_ID3TAG
-	struct id3_tag *id3_tag = nullptr;
-	id3_length_t count;
-	id3_byte_t const *id3_data;
 	id3_byte_t *allocated = nullptr;
 
-	count = stream.bufend - stream.this_frame;
+	const id3_length_t count = stream.bufend - stream.this_frame;
 
+	const id3_byte_t *id3_data;
 	if (tagsize <= count) {
 		id3_data = stream.this_frame;
 		mad_stream_skip(&(stream), tagsize);
 	} else {
-		allocated = (id3_byte_t *)g_malloc(tagsize);
+		allocated = new id3_byte_t[tagsize];
 		memcpy(allocated, stream.this_frame, count);
 		mad_stream_skip(&(stream), count);
 
 		if (!decoder_read_full(decoder, input_stream,
 				       allocated + count, tagsize - count)) {
 			LogDebug(mad_domain, "error parsing ID3 tag");
-			g_free(allocated);
+			delete[] allocated;
 			return;
 		}
 
 		id3_data = allocated;
 	}
 
-	id3_tag = id3_tag_parse(id3_data, tagsize);
+	struct id3_tag *const id3_tag = id3_tag_parse(id3_data, tagsize);
 	if (id3_tag == nullptr) {
-		g_free(allocated);
+		delete[] allocated;
 		return;
 	}
 
@@ -390,7 +368,7 @@ MadDecoder::ParseId3(size_t tagsize, Tag **mpd_tag)
 
 	id3_tag_delete(id3_tag);
 
-	g_free(allocated);
+	delete[] allocated;
 #else /* !HAVE_ID3TAG */
 	(void)mpd_tag;
 
@@ -426,6 +404,20 @@ id3_tag_query(const void *p0, size_t length)
 }
 #endif /* !HAVE_ID3TAG */
 
+static enum mp3_action
+RecoverFrameError(struct mad_stream &stream)
+{
+	if (MAD_RECOVERABLE(stream.error))
+		return DECODE_SKIP;
+	else if (stream.error == MAD_ERROR_BUFLEN)
+		return DECODE_CONT;
+
+	FormatWarning(mad_domain,
+		      "unrecoverable frame level error: %s",
+		      mad_stream_errorstr(&stream));
+	return DECODE_BREAK;
+}
+
 enum mp3_action
 MadDecoder::DecodeNextFrameHeader(Tag **tag)
 {
@@ -448,18 +440,8 @@ MadDecoder::DecodeNextFrameHeader(Tag **tag)
 				return DECODE_CONT;
 			}
 		}
-		if (MAD_RECOVERABLE(stream.error)) {
-			return DECODE_SKIP;
-		} else {
-			if (stream.error == MAD_ERROR_BUFLEN)
-				return DECODE_CONT;
-			else {
-				FormatWarning(mad_domain,
-					      "unrecoverable frame level error: %s",
-					      mad_stream_errorstr(&stream));
-				return DECODE_BREAK;
-			}
-		}
+
+		return RecoverFrameError(stream);
 	}
 
 	enum mad_layer new_layer = frame.header.layer;
@@ -495,28 +477,18 @@ MadDecoder::DecodeNextFrame()
 				return DECODE_CONT;
 			}
 		}
-		if (MAD_RECOVERABLE(stream.error)) {
-			return DECODE_SKIP;
-		} else {
-			if (stream.error == MAD_ERROR_BUFLEN)
-				return DECODE_CONT;
-			else {
-				FormatWarning(mad_domain,
-					      "unrecoverable frame level error: %s",
-					      mad_stream_errorstr(&stream));
-				return DECODE_BREAK;
-			}
-		}
+
+		return RecoverFrameError(stream);
 	}
 
 	return DECODE_OK;
 }
 
 /* xing stuff stolen from alsaplayer, and heavily modified by jat */
-#define XI_MAGIC (('X' << 8) | 'i')
-#define NG_MAGIC (('n' << 8) | 'g')
-#define IN_MAGIC (('I' << 8) | 'n')
-#define FO_MAGIC (('f' << 8) | 'o')
+static constexpr unsigned XI_MAGIC = (('X' << 8) | 'i');
+static constexpr unsigned NG_MAGIC = (('n' << 8) | 'g');
+static constexpr unsigned IN_MAGIC = (('I' << 8) | 'n');
+static constexpr unsigned FO_MAGIC = (('f' << 8) | 'o');
 
 enum xing_magic {
 	XING_MAGIC_XING, /* VBR */
@@ -532,12 +504,10 @@ struct xing {
 	enum xing_magic magic;  /* header magic */
 };
 
-enum {
-	XING_FRAMES = 0x00000001L,
-	XING_BYTES  = 0x00000002L,
-	XING_TOC    = 0x00000004L,
-	XING_SCALE  = 0x00000008L
-};
+static const unsigned XING_FRAMES = 1;
+static const unsigned XING_BYTES = 2;
+static const unsigned XING_TOC = 4;
+static const unsigned XING_SCALE = 8;
 
 struct lame_version {
 	unsigned major;
@@ -558,17 +528,12 @@ struct lame {
 static bool
 parse_xing(struct xing *xing, struct mad_bitptr *ptr, int *oldbitlen)
 {
-	unsigned long bits;
-	int bitlen;
-	int bitsleft;
-	int i;
-
-	bitlen = *oldbitlen;
+	int bitlen = *oldbitlen;
 
 	if (bitlen < 16)
 		return false;
 
-	bits = mad_bit_read(ptr, 16);
+	const unsigned long bits = mad_bit_read(ptr, 16);
 	bitlen -= 16;
 
 	if (bits == XI_MAGIC) {
@@ -617,7 +582,8 @@ parse_xing(struct xing *xing, struct mad_bitptr *ptr, int *oldbitlen)
 	if (xing->flags & XING_TOC) {
 		if (bitlen < 800)
 			return false;
-		for (i = 0; i < 100; ++i) xing->toc[i] = mad_bit_read(ptr, 8);
+		for (unsigned i = 0; i < 100; ++i)
+			xing->toc[i] = mad_bit_read(ptr, 8);
 		bitlen -= 800;
 	}
 
@@ -630,7 +596,7 @@ parse_xing(struct xing *xing, struct mad_bitptr *ptr, int *oldbitlen)
 
 	/* Make sure we consume no less than 120 bytes (960 bits) in hopes that
 	 * the LAME tag is found there, and not right after the Xing header */
-	bitsleft = 960 - ((*oldbitlen) - bitlen);
+	const int bitsleft = 960 - (*oldbitlen - bitlen);
 	if (bitsleft < 0)
 		return false;
 	else if (bitsleft > 0) {
@@ -646,19 +612,12 @@ parse_xing(struct xing *xing, struct mad_bitptr *ptr, int *oldbitlen)
 static bool
 parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen)
 {
-	int adj = 0;
-	int name;
-	int orig;
-	int sign;
-	int gain;
-	int i;
-
 	/* Unlike the xing header, the lame tag has a fixed length.  Fail if
 	 * not all 36 bytes (288 bits) are there. */
 	if (*bitlen < 288)
 		return false;
 
-	for (i = 0; i < 9; i++)
+	for (unsigned i = 0; i < 9; i++)
 		lame->encoder[i] = (char)mad_bit_read(ptr, 8);
 	lame->encoder[9] = '\0';
 
@@ -667,7 +626,7 @@ parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen)
 	/* This is technically incorrect, since the encoder might not be lame.
 	 * But there's no other way to determine if this is a lame tag, and we
 	 * wouldn't want to go reading a tag that's not there. */
-	if (!g_str_has_prefix(lame->encoder, "LAME"))
+	if (!StringStartsWith(lame->encoder, "LAME"))
 		return false;
 
 	if (sscanf(lame->encoder+4, "%u.%u",
@@ -684,6 +643,7 @@ parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen)
 	 * it's impossible to make the proper adjustment for 3.95.
 	 * Fortunately, 3.95 was only out for about a day before 3.95.1 was
 	 * released. -- tmz */
+	int adj = 0;
 	if (lame->version.major < 3 ||
 	    (lame->version.major == 3 && lame->version.minor < 95))
 		adj = 6;
@@ -694,10 +654,10 @@ parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen)
 	FormatDebug(mad_domain, "LAME peak found: %f", lame->peak);
 
 	lame->track_gain = 0;
-	name = mad_bit_read(ptr, 3); /* gain name */
-	orig = mad_bit_read(ptr, 3); /* gain originator */
-	sign = mad_bit_read(ptr, 1); /* sign bit */
-	gain = mad_bit_read(ptr, 9); /* gain*10 */
+	unsigned name = mad_bit_read(ptr, 3); /* gain name */
+	unsigned orig = mad_bit_read(ptr, 3); /* gain originator */
+	unsigned sign = mad_bit_read(ptr, 1); /* sign bit */
+	int gain = mad_bit_read(ptr, 9); /* gain*10 */
 	if (gain && name == 1 && orig != 0) {
 		lame->track_gain = ((sign ? -gain : gain) / 10.0) + adj;
 		FormatDebug(mad_domain, "LAME track gain found: %f",
@@ -740,14 +700,13 @@ parse_lame(struct lame *lame, struct mad_bitptr *ptr, int *bitlen)
 	return true;
 }
 
-static inline float
+static inline SongTime
 mp3_frame_duration(const struct mad_frame *frame)
 {
-	return mad_timer_count(frame->header.duration,
-			       MAD_UNITS_MILLISECONDS) / 1000.0;
+	return ToSongTime(frame->header.duration);
 }
 
-inline InputStream::offset_type
+inline offset_type
 MadDecoder::ThisFrameOffset() const
 {
 	auto offset = input_stream.GetOffset();
@@ -760,7 +719,7 @@ MadDecoder::ThisFrameOffset() const
 	return offset;
 }
 
-inline InputStream::offset_type
+inline offset_type
 MadDecoder::RestIncludingThisFrame() const
 {
 	return input_stream.GetSize() - ThisFrameOffset();
@@ -769,16 +728,22 @@ MadDecoder::RestIncludingThisFrame() const
 inline void
 MadDecoder::FileSizeToSongLength()
 {
-	InputStream::offset_type rest = RestIncludingThisFrame();
-
-	if (rest > 0) {
-		float frame_duration = mp3_frame_duration(&frame);
-
-		total_time = (rest * 8.0) / frame.header.bitrate;
-		max_frames = total_time / frame_duration + FRAMES_CUSHION;
+	if (input_stream.KnownSize()) {
+		offset_type rest = RestIncludingThisFrame();
+
+		const SongTime frame_duration = mp3_frame_duration(&frame);
+		const SongTime duration =
+			SongTime::FromScale<uint64_t>(rest,
+						      frame.header.bitrate / 8);
+		total_time = duration;
+
+		max_frames = (frame_duration.IsPositive()
+			      ? duration.count() / frame_duration.count()
+			      : 0)
+			+ FRAMES_CUSHION;
 	} else {
 		max_frames = FRAMES_CUSHION;
-		total_time = 0;
+		total_time = SignedSongTime::Negative();
 	}
 }
 
@@ -786,16 +751,10 @@ inline bool
 MadDecoder::DecodeFirstFrame(Tag **tag)
 {
 	struct xing xing;
-	struct lame lame;
-	struct mad_bitptr ptr;
-	int bitlen;
-	enum mp3_action ret;
-
-	/* stfu gcc */
-	memset(&xing, 0, sizeof(struct xing));
-	xing.flags = 0;
+	xing.frames = 0;
 
 	while (true) {
+		enum mp3_action ret;
 		do {
 			ret = DecodeNextFrameHeader(tag);
 		} while (ret == DECODE_CONT);
@@ -811,8 +770,8 @@ MadDecoder::DecodeFirstFrame(Tag **tag)
 		if (ret == DECODE_OK) break;
 	}
 
-	ptr = stream.anc_ptr;
-	bitlen = stream.anc_bitlen;
+	struct mad_bitptr ptr = stream.anc_ptr;
+	int bitlen = stream.anc_bitlen;
 
 	FileSizeToSongLength();
 
@@ -820,16 +779,16 @@ MadDecoder::DecodeFirstFrame(Tag **tag)
 	 * if an xing tag exists, use that!
 	 */
 	if (parse_xing(&xing, &ptr, &bitlen)) {
-		found_xing = true;
 		mute_frame = MUTEFRAME_SKIP;
 
 		if ((xing.flags & XING_FRAMES) && xing.frames) {
 			mad_timer_t duration = frame.header.duration;
 			mad_timer_multiply(&duration, xing.frames);
-			total_time = ((float)mad_timer_count(duration, MAD_UNITS_MILLISECONDS)) / 1000;
+			total_time = ToSongTime(duration);
 			max_frames = xing.frames;
 		}
 
+		struct lame lame;
 		if (parse_lame(&lame, &ptr, &bitlen)) {
 			if (gapless_playback && input_stream.IsSeekable()) {
 				drop_start_samples = lame.encoder_delay +
@@ -877,24 +836,22 @@ MadDecoder::~MadDecoder()
 }
 
 /* this is primarily used for getting total time for tags */
-static int
+static std::pair<bool, SignedSongTime>
 mad_decoder_total_file_time(InputStream &is)
 {
 	MadDecoder data(nullptr, is);
 	return data.DecodeFirstFrame(nullptr)
-		? data.total_time + 0.5
-		: -1;
+		? std::make_pair(true, data.total_time)
+		: std::make_pair(false, SignedSongTime::Negative());
 }
 
 long
-MadDecoder::TimeToFrame(double t) const
+MadDecoder::TimeToFrame(SongTime t) const
 {
 	unsigned long i;
 
 	for (i = 0; i < highest_frame; ++i) {
-		double frame_time =
-			mad_timer_count(times[i],
-					MAD_UNITS_MILLISECONDS) / 1000.;
+		auto frame_time = ToSongTime(times[i]);
 		if (frame_time >= t)
 			break;
 	}
@@ -925,15 +882,13 @@ MadDecoder::UpdateTimerNextFrame()
 		timer = times[current_frame];
 
 	current_frame++;
-	elapsed_time = mad_timer_count(timer, MAD_UNITS_MILLISECONDS) / 1000.0;
+	elapsed_time = ToSongTime(timer);
 }
 
 DecoderCommand
 MadDecoder::SendPCM(unsigned i, unsigned pcm_length)
 {
-	unsigned max_samples;
-
-	max_samples = sizeof(output_buffer) /
+	unsigned max_samples = sizeof(output_buffer) /
 		sizeof(output_buffer[0]) /
 		MAD_NCHANNELS(&frame.header);
 
@@ -1014,8 +969,6 @@ MadDecoder::SyncAndSend()
 inline bool
 MadDecoder::Read()
 {
-	enum mp3_action ret;
-
 	UpdateTimerNextFrame();
 
 	switch (mute_frame) {
@@ -1025,17 +978,16 @@ MadDecoder::Read()
 		mute_frame = MUTEFRAME_NONE;
 		break;
 	case MUTEFRAME_SEEK:
-		if (elapsed_time >= seek_where)
+		if (elapsed_time >= seek_time)
 			mute_frame = MUTEFRAME_NONE;
 		break;
 	case MUTEFRAME_NONE:
 		cmd = SyncAndSend();
 		if (cmd == DecoderCommand::SEEK) {
-			unsigned long j;
-
 			assert(input_stream.IsSeekable());
 
-			j = TimeToFrame(decoder_seek_where(*decoder));
+			unsigned long j =
+				TimeToFrame(decoder_seek_time(*decoder));
 			if (j < highest_frame) {
 				if (Seek(frame_offsets[j])) {
 					current_frame = j;
@@ -1043,7 +995,7 @@ MadDecoder::Read()
 				} else
 					decoder_seek_error(*decoder);
 			} else {
-				seek_where = decoder_seek_where(*decoder);
+				seek_time = decoder_seek_time(*decoder);
 				mute_frame = MUTEFRAME_SEEK;
 				decoder_command_finished(*decoder);
 			}
@@ -1052,8 +1004,7 @@ MadDecoder::Read()
 	}
 
 	while (true) {
-		bool skip = false;
-
+		enum mp3_action ret;
 		do {
 			Tag *tag = nullptr;
 
@@ -1067,8 +1018,8 @@ MadDecoder::Read()
 		} while (ret == DECODE_CONT);
 		if (ret == DECODE_BREAK)
 			return false;
-		else if (ret == DECODE_SKIP)
-			skip = true;
+
+		const bool skip = ret == DECODE_SKIP;
 
 		if (mute_frame == MUTEFRAME_NONE) {
 			do {
@@ -1079,10 +1030,8 @@ MadDecoder::Read()
 		}
 
 		if (!skip && ret == DECODE_OK)
-			break;
+			return true;
 	}
-
-	return ret != DECODE_BREAK;
 }
 
 static void
@@ -1096,7 +1045,7 @@ mp3_decode(Decoder &decoder, InputStream &input_stream)
 
 		if (decoder_get_command(decoder) == DecoderCommand::NONE)
 			LogError(mad_domain,
-				 "Input does not appear to be a mp3 bit stream");
+				 "input/Input does not appear to be a mp3 bit stream");
 		return;
 	}
 
@@ -1128,13 +1077,13 @@ static bool
 mad_decoder_scan_stream(InputStream &is,
 			const struct tag_handler *handler, void *handler_ctx)
 {
-	int total_time;
-
-	total_time = mad_decoder_total_file_time(is);
-	if (total_time < 0)
+	const auto result = mad_decoder_total_file_time(is);
+	if (!result.first)
 		return false;
 
-	tag_handler_invoke_duration(handler, handler_ctx, total_time);
+	if (!result.second.IsNegative())
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    SongTime(result.second));
 	return true;
 }
 
diff --git a/src/decoder/MadDecoderPlugin.hxx b/src/decoder/plugins/MadDecoderPlugin.hxx
index 450323670..eb2a10d6f 100644
--- a/src/decoder/MadDecoderPlugin.hxx
+++ b/src/decoder/plugins/MadDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/MikmodDecoderPlugin.cxx b/src/decoder/plugins/MikmodDecoderPlugin.cxx
index 34381aafa..85633f1fc 100644
--- a/src/decoder/MikmodDecoderPlugin.cxx
+++ b/src/decoder/plugins/MikmodDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,14 +19,15 @@
 
 #include "config.h"
 #include "MikmodDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "tag/TagHandler.hxx"
 #include "system/FatalError.hxx"
+#include "fs/Path.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
 #include <mikmod.h>
+
 #include <assert.h>
 
 static constexpr Domain mikmod_domain("mikmod");
@@ -146,11 +147,11 @@ mikmod_decoder_finish(void)
 }
 
 static void
-mikmod_decoder_file_decode(Decoder &decoder, const char *path_fs)
+mikmod_decoder_file_decode(Decoder &decoder, Path path_fs)
 {
 	/* deconstify the path because libmikmod wants a non-const
 	   string pointer */
-	char *const path2 = const_cast<char *>(path_fs);
+	char *const path2 = const_cast<char *>(path_fs.c_str());
 
 	MODULE *handle;
 	int ret;
@@ -160,7 +161,7 @@ mikmod_decoder_file_decode(Decoder &decoder, const char *path_fs)
 
 	if (handle == nullptr) {
 		FormatError(mikmod_domain,
-			    "failed to open mod: %s", path_fs);
+			    "failed to open mod: %s", path_fs.c_str());
 		return;
 	}
 
@@ -169,7 +170,8 @@ mikmod_decoder_file_decode(Decoder &decoder, const char *path_fs)
 	const AudioFormat audio_format(mikmod_sample_rate, SampleFormat::S16, 2);
 	assert(audio_format.IsValid());
 
-	decoder_initialized(decoder, audio_format, false, 0);
+	decoder_initialized(decoder, audio_format, false,
+			    SignedSongTime::Negative());
 
 	Player_Start(handle);
 
@@ -184,18 +186,18 @@ mikmod_decoder_file_decode(Decoder &decoder, const char *path_fs)
 }
 
 static bool
-mikmod_decoder_scan_file(const char *path_fs,
+mikmod_decoder_scan_file(Path path_fs,
 			 const struct tag_handler *handler, void *handler_ctx)
 {
 	/* deconstify the path because libmikmod wants a non-const
 	   string pointer */
-	char *const path2 = const_cast<char *>(path_fs);
+	char *const path2 = const_cast<char *>(path_fs.c_str());
 
 	MODULE *handle = Player_Load(path2, 128, 0);
 
 	if (handle == nullptr) {
 		FormatDebug(mikmod_domain,
-			    "Failed to open file: %s", path_fs);
+			    "Failed to open file: %s", path_fs.c_str());
 		return false;
 	}
 
diff --git a/src/decoder/MikmodDecoderPlugin.hxx b/src/decoder/plugins/MikmodDecoderPlugin.hxx
index d25c5f6e7..27ba2a823 100644
--- a/src/decoder/MikmodDecoderPlugin.hxx
+++ b/src/decoder/plugins/MikmodDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/ModplugDecoderPlugin.cxx b/src/decoder/plugins/ModplugDecoderPlugin.cxx
index e75f5479c..3e0a41550 100644
--- a/src/decoder/ModplugDecoderPlugin.cxx
+++ b/src/decoder/plugins/ModplugDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,8 +19,8 @@
 
 #include "config.h"
 #include "ModplugDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "tag/TagHandler.hxx"
 #include "system/FatalError.hxx"
 #include "util/WritableBuffer.hxx"
@@ -36,7 +36,7 @@ static constexpr Domain modplug_domain("modplug");
 
 static constexpr size_t MODPLUG_FRAME_SIZE = 4096;
 static constexpr size_t MODPLUG_PREALLOC_BLOCK = 256 * 1024;
-static constexpr InputStream::offset_type MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
+static constexpr offset_type MODPLUG_FILE_LIMIT = 100 * 1024 * 1024;
 
 static int modplug_loop_count;
 
@@ -54,24 +54,29 @@ modplug_decoder_init(const config_param &param)
 static WritableBuffer<uint8_t>
 mod_loadfile(Decoder *decoder, InputStream &is)
 {
-	const InputStream::offset_type size = is.GetSize();
+	//known/unknown size, preallocate array, lets read in chunks
 
-	if (size == 0) {
-		LogWarning(modplug_domain, "file is empty");
-		return { nullptr, 0 };
-	}
+	const bool is_stream = !is.KnownSize();
 
-	if (size > MODPLUG_FILE_LIMIT) {
-		LogWarning(modplug_domain, "file too large");
-		return { nullptr, 0 };
-	}
+	WritableBuffer<uint8_t> buffer;
+	if (is_stream)
+		buffer.size = MODPLUG_PREALLOC_BLOCK;
+	else {
+		const auto size = is.GetSize();
+
+		if (size == 0) {
+			LogWarning(modplug_domain, "file is empty");
+			return { nullptr, 0 };
+		}
 
-	//known/unknown size, preallocate array, lets read in chunks
+		if (size > MODPLUG_FILE_LIMIT) {
+			LogWarning(modplug_domain, "file too large");
+			return { nullptr, 0 };
+		}
 
-	const bool is_stream = size < 0;
+		buffer.size = size;
+	}
 
-	WritableBuffer<uint8_t> buffer;
-	buffer.size = is_stream ? MODPLUG_PREALLOC_BLOCK : size;
 	buffer.data = new uint8_t[buffer.size];
 
 	uint8_t *const end = buffer.end();
@@ -148,7 +153,7 @@ mod_decode(Decoder &decoder, InputStream &is)
 
 	decoder_initialized(decoder, audio_format,
 			    is.IsSeekable(),
-			    ModPlug_GetLength(f) / 1000.0);
+			    SongTime::FromMS(ModPlug_GetLength(f)));
 
 	DecoderCommand cmd;
 	do {
@@ -161,10 +166,7 @@ mod_decode(Decoder &decoder, InputStream &is)
 				   0);
 
 		if (cmd == DecoderCommand::SEEK) {
-			float where = decoder_seek_where(decoder);
-
-			ModPlug_Seek(f, (int)(where * 1000.0));
-
+			ModPlug_Seek(f, decoder_seek_time(decoder).ToMS());
 			decoder_command_finished(decoder);
 		}
 
@@ -182,7 +184,7 @@ modplug_scan_stream(InputStream &is,
 		return false;
 
 	tag_handler_invoke_duration(handler, handler_ctx,
-				    ModPlug_GetLength(f) / 1000);
+				    SongTime::FromMS(ModPlug_GetLength(f)));
 
 	const char *title = ModPlug_GetName(f);
 	if (title != nullptr)
diff --git a/src/decoder/ModplugDecoderPlugin.hxx b/src/decoder/plugins/ModplugDecoderPlugin.hxx
index 4cd9f5b25..08f2ecb12 100644
--- a/src/decoder/ModplugDecoderPlugin.hxx
+++ b/src/decoder/plugins/ModplugDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/MpcdecDecoderPlugin.cxx b/src/decoder/plugins/MpcdecDecoderPlugin.cxx
index dc258623c..befed0f3b 100644
--- a/src/decoder/MpcdecDecoderPlugin.cxx
+++ b/src/decoder/plugins/MpcdecDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,8 +19,8 @@
 
 #include "config.h"
 #include "MpcdecDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "util/Error.hxx"
@@ -30,8 +30,6 @@
 
 #include <mpc/mpcdec.h>
 
-#include <assert.h>
-#include <unistd.h>
 #include <math.h>
 
 struct mpc_decoder_data {
@@ -59,7 +57,7 @@ mpc_seek_cb(mpc_reader *reader, mpc_int32_t offset)
 	struct mpc_decoder_data *data =
 		(struct mpc_decoder_data *)reader->data;
 
-	return data->is.LockSeek(offset, SEEK_SET, IgnoreError());
+	return data->is.LockSeek(offset, IgnoreError());
 }
 
 static mpc_int32_t
@@ -86,6 +84,9 @@ mpc_getsize_cb(mpc_reader *reader)
 	struct mpc_decoder_data *data =
 		(struct mpc_decoder_data *)reader->data;
 
+	if (!data->is.KnownSize())
+		return -1;
+
 	return data->is.GetSize();
 }
 
@@ -179,13 +180,13 @@ mpcdec_decode(Decoder &mpd_decoder, InputStream &is)
 
 	decoder_initialized(mpd_decoder, audio_format,
 			    is.IsSeekable(),
-			    mpc_streaminfo_get_length(&info));
+			    SongTime::FromS(mpc_streaminfo_get_length(&info)));
 
 	DecoderCommand cmd = DecoderCommand::NONE;
 	do {
 		if (cmd == DecoderCommand::SEEK) {
-			mpc_int64_t where = decoder_seek_where(mpd_decoder) *
-				audio_format.sample_rate;
+			mpc_int64_t where =
+				decoder_seek_where_frame(mpd_decoder);
 			bool success;
 
 			success = mpc_demux_seek_sample(demux, where)
@@ -227,7 +228,7 @@ mpcdec_decode(Decoder &mpd_decoder, InputStream &is)
 	mpc_demux_exit(demux);
 }
 
-static float
+static SignedSongTime
 mpcdec_get_file_duration(InputStream &is)
 {
 	mpc_decoder_data data(is, nullptr);
@@ -242,25 +243,24 @@ mpcdec_get_file_duration(InputStream &is)
 
 	mpc_demux *demux = mpc_demux_init(&reader);
 	if (demux == nullptr)
-		return -1;
+		return SignedSongTime::Negative();
 
 	mpc_streaminfo info;
 	mpc_demux_get_info(demux, &info);
 	mpc_demux_exit(demux);
 
-	return mpc_streaminfo_get_length(&info);
+	return SongTime::FromS(mpc_streaminfo_get_length(&info));
 }
 
 static bool
 mpcdec_scan_stream(InputStream &is,
 		   const struct tag_handler *handler, void *handler_ctx)
 {
-	float total_time = mpcdec_get_file_duration(is);
-
-	if (total_time < 0)
+	const auto duration = mpcdec_get_file_duration(is);
+	if (duration.IsNegative())
 		return false;
 
-	tag_handler_invoke_duration(handler, handler_ctx, total_time);
+	tag_handler_invoke_duration(handler, handler_ctx, SongTime(duration));
 	return true;
 }
 
diff --git a/src/decoder/MpcdecDecoderPlugin.hxx b/src/decoder/plugins/MpcdecDecoderPlugin.hxx
index 23ecc801e..7f71311fa 100644
--- a/src/decoder/MpcdecDecoderPlugin.hxx
+++ b/src/decoder/plugins/MpcdecDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/Mpg123DecoderPlugin.cxx b/src/decoder/plugins/Mpg123DecoderPlugin.cxx
index df23f7847..166529a4d 100644
--- a/src/decoder/Mpg123DecoderPlugin.cxx
+++ b/src/decoder/plugins/Mpg123DecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,16 +19,19 @@
 
 #include "config.h" /* must be first for large file support */
 #include "Mpg123DecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
+#include "tag/TagBuilder.hxx"
+#include "tag/ReplayGain.hxx"
+#include "tag/MixRamp.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
-
 #include <mpg123.h>
+
 #include <stdio.h>
 
 static constexpr Domain mpg123_domain("mpg123");
@@ -60,14 +63,10 @@ static bool
 mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
 		AudioFormat &audio_format)
 {
-	int error;
-	int channels, encoding;
-	long rate;
-
 	/* mpg123_open() wants a writable string :-( */
 	char *const path2 = const_cast<char *>(path_fs);
 
-	error = mpg123_open(handle, path2);
+	int error = mpg123_open(handle, path2);
 	if (error != MPG123_OK) {
 		FormatWarning(mpg123_domain,
 			      "libmpg123 failed to open %s: %s",
@@ -77,6 +76,8 @@ mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
 
 	/* obtain the audio format */
 
+	long rate;
+	int channels, encoding;
 	error = mpg123_getformat(handle, &rate, &channels, &encoding);
 	if (error != MPG123_OK) {
 		FormatWarning(mpg123_domain,
@@ -104,16 +105,96 @@ mpd_mpg123_open(mpg123_handle *handle, const char *path_fs,
 }
 
 static void
-mpd_mpg123_file_decode(Decoder &decoder, const char *path_fs)
+AddTagItem(TagBuilder &tag, TagType type, const mpg123_string &s)
 {
-	mpg123_handle *handle;
-	int error;
-	off_t num_samples;
-	struct mpg123_frameinfo info;
+	assert(s.p != nullptr);
+	assert(s.size >= s.fill);
+	assert(s.fill > 0);
+
+	tag.AddItem(type, s.p, s.fill - 1);
+}
+
+static void
+AddTagItem(TagBuilder &tag, TagType type, const mpg123_string *s)
+{
+	if (s != nullptr)
+		AddTagItem(tag, type, *s);
+}
+
+static void
+mpd_mpg123_id3v2_tag(Decoder &decoder, const mpg123_id3v2 &id3v2)
+{
+	TagBuilder tag;
+
+	AddTagItem(tag, TAG_TITLE, id3v2.title);
+	AddTagItem(tag, TAG_ARTIST, id3v2.artist);
+	AddTagItem(tag, TAG_ALBUM, id3v2.album);
+	AddTagItem(tag, TAG_DATE, id3v2.year);
+	AddTagItem(tag, TAG_GENRE, id3v2.genre);
+
+	for (size_t i = 0, n = id3v2.comments; i < n; ++i)
+		AddTagItem(tag, TAG_COMMENT, id3v2.comment_list[i].text);
+
+	decoder_tag(decoder, nullptr, tag.Commit());
+}
+
+static void
+mpd_mpg123_id3v2_extras(Decoder &decoder, const mpg123_id3v2 &id3v2)
+{
+	ReplayGainInfo replay_gain;
+	replay_gain.Clear();
+
+	MixRampInfo mix_ramp;
+
+	bool found_replay_gain = false, found_mixramp = false;
+
+	for (size_t i = 0, n = id3v2.extras; i < n; ++i) {
+		if (ParseReplayGainTag(replay_gain,
+				       id3v2.extra[i].description.p,
+				       id3v2.extra[i].text.p))
+			found_replay_gain = true;
+		else if (ParseMixRampTag(mix_ramp,
+					 id3v2.extra[i].description.p,
+					 id3v2.extra[i].text.p))
+			found_mixramp = true;
+	}
 
+	if (found_replay_gain)
+		decoder_replay_gain(decoder, &replay_gain);
+
+	if (found_mixramp)
+		decoder_mixramp(decoder, std::move(mix_ramp));
+}
+
+static void
+mpd_mpg123_id3v2(Decoder &decoder, const mpg123_id3v2 &id3v2)
+{
+	mpd_mpg123_id3v2_tag(decoder, id3v2);
+	mpd_mpg123_id3v2_extras(decoder, id3v2);
+}
+
+static void
+mpd_mpg123_meta(Decoder &decoder, mpg123_handle *const handle)
+{
+	if ((mpg123_meta_check(handle) & MPG123_NEW_ID3) == 0)
+		return;
+
+	mpg123_id3v1 *v1;
+	mpg123_id3v2 *v2;
+	if (mpg123_id3(handle, &v1, &v2) != MPG123_OK)
+		return;
+
+	if (v2 != nullptr)
+		mpd_mpg123_id3v2(decoder, *v2);
+}
+
+static void
+mpd_mpg123_file_decode(Decoder &decoder, Path path_fs)
+{
 	/* open the file */
 
-	handle = mpg123_new(nullptr, &error);
+	int error;
+	mpg123_handle *const handle = mpg123_new(nullptr, &error);
 	if (handle == nullptr) {
 		FormatError(mpg123_domain,
 			    "mpg123_new() failed: %s",
@@ -122,19 +203,22 @@ mpd_mpg123_file_decode(Decoder &decoder, const char *path_fs)
 	}
 
 	AudioFormat audio_format;
-	if (!mpd_mpg123_open(handle, path_fs, audio_format)) {
+	if (!mpd_mpg123_open(handle, path_fs.c_str(), audio_format)) {
 		mpg123_delete(handle);
 		return;
 	}
 
-	num_samples = mpg123_length(handle);
+	const off_t num_samples = mpg123_length(handle);
 
 	/* tell MPD core we're ready */
 
-	decoder_initialized(decoder, audio_format, true,
-			    (float)num_samples /
-			    (float)audio_format.sample_rate);
+	const auto duration =
+		SongTime::FromScale<uint64_t>(num_samples,
+					      audio_format.sample_rate);
 
+	decoder_initialized(decoder, audio_format, true, duration);
+
+	struct mpg123_frameinfo info;
 	if (mpg123_info(handle, &info) != MPG123_OK) {
 		info.vbr = MPG123_CBR;
 		info.bitrate = 0;
@@ -151,14 +235,15 @@ mpd_mpg123_file_decode(Decoder &decoder, const char *path_fs)
 	}
 
 	/* the decoder main loop */
-
 	DecoderCommand cmd;
 	do {
-		unsigned char buffer[8192];
-		size_t nbytes;
+		/* read metadata */
+		mpd_mpg123_meta(decoder, handle);
 
 		/* decode */
 
+		unsigned char buffer[8192];
+		size_t nbytes;
 		error = mpg123_read(handle, buffer, sizeof(buffer), &nbytes);
 		if (error != MPG123_OK) {
 			if (error != MPG123_DONE)
@@ -181,7 +266,7 @@ mpd_mpg123_file_decode(Decoder &decoder, const char *path_fs)
 		cmd = decoder_data(decoder, nullptr, buffer, nbytes, info.bitrate);
 
 		if (cmd == DecoderCommand::SEEK) {
-			off_t c = decoder_seek_where(decoder)*audio_format.sample_rate;
+			off_t c = decoder_seek_where_frame(decoder);
 			c = mpg123_seek(handle, c, SEEK_SET);
 			if (c < 0)
 				decoder_seek_error(decoder);
@@ -200,14 +285,11 @@ mpd_mpg123_file_decode(Decoder &decoder, const char *path_fs)
 }
 
 static bool
-mpd_mpg123_scan_file(const char *path_fs,
+mpd_mpg123_scan_file(Path path_fs,
 		     const struct tag_handler *handler, void *handler_ctx)
 {
-	mpg123_handle *handle;
 	int error;
-	off_t num_samples;
-
-	handle = mpg123_new(nullptr, &error);
+	mpg123_handle *const handle = mpg123_new(nullptr, &error);
 	if (handle == nullptr) {
 		FormatError(mpg123_domain,
 			    "mpg123_new() failed: %s",
@@ -216,12 +298,12 @@ mpd_mpg123_scan_file(const char *path_fs,
 	}
 
 	AudioFormat audio_format;
-	if (!mpd_mpg123_open(handle, path_fs, audio_format)) {
+	if (!mpd_mpg123_open(handle, path_fs.c_str(), audio_format)) {
 		mpg123_delete(handle);
 		return false;
 	}
 
-	num_samples = mpg123_length(handle);
+	const off_t num_samples = mpg123_length(handle);
 	if (num_samples <= 0) {
 		mpg123_delete(handle);
 		return false;
@@ -231,8 +313,11 @@ mpd_mpg123_scan_file(const char *path_fs,
 
 	mpg123_delete(handle);
 
-	tag_handler_invoke_duration(handler, handler_ctx,
-				    num_samples / audio_format.sample_rate);
+	const auto duration =
+		SongTime::FromScale<uint64_t>(num_samples,
+					      audio_format.sample_rate);
+
+	tag_handler_invoke_duration(handler, handler_ctx, duration);
 	return true;
 }
 
diff --git a/src/decoder/Mpg123DecoderPlugin.hxx b/src/decoder/plugins/Mpg123DecoderPlugin.hxx
index 10f7c37f5..fd089c6a4 100644
--- a/src/decoder/Mpg123DecoderPlugin.hxx
+++ b/src/decoder/plugins/Mpg123DecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OggCodec.cxx b/src/decoder/plugins/OggCodec.cxx
index 565dbafcf..c7f39586e 100644
--- a/src/decoder/OggCodec.cxx
+++ b/src/decoder/plugins/OggCodec.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,6 +23,7 @@
 
 #include "config.h"
 #include "OggCodec.hxx"
+#include "../DecoderAPI.hxx"
 
 #include <string.h>
 
diff --git a/src/decoder/OggCodec.hxx b/src/decoder/plugins/OggCodec.hxx
index 857871607..3b096561c 100644
--- a/src/decoder/OggCodec.hxx
+++ b/src/decoder/plugins/OggCodec.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -24,7 +24,8 @@
 #ifndef MPD_OGG_CODEC_HXX
 #define MPD_OGG_CODEC_HXX
 
-#include "DecoderAPI.hxx"
+struct Decoder;
+class InputStream;
 
 enum ogg_codec {
 	OGG_CODEC_UNKNOWN,
diff --git a/src/decoder/OggFind.cxx b/src/decoder/plugins/OggFind.cxx
index 65c7fa3ce..978e1d7cf 100644
--- a/src/decoder/OggFind.cxx
+++ b/src/decoder/plugins/OggFind.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,10 +20,9 @@
 #include "config.h"
 #include "OggFind.hxx"
 #include "OggSyncState.hxx"
+#include "input/InputStream.hxx"
 #include "util/Error.hxx"
 
-#include <stdio.h>
-
 bool
 OggFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet)
 {
@@ -41,7 +40,7 @@ OggFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet)
 
 bool
 OggSeekPageAtOffset(OggSyncState &oy, ogg_stream_state &os, InputStream &is,
-		    InputStream::offset_type offset, int whence)
+		    offset_type offset)
 {
 	oy.Reset();
 
@@ -49,7 +48,7 @@ OggSeekPageAtOffset(OggSyncState &oy, ogg_stream_state &os, InputStream &is,
 	   data */
 	ogg_stream_reset(&os);
 
-	return is.LockSeek(offset, whence, IgnoreError()) &&
+	return is.LockSeek(offset, IgnoreError()) &&
 		oy.ExpectPageSeekIn(os);
 }
 
@@ -57,12 +56,15 @@ bool
 OggSeekFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet,
 	       InputStream &is)
 {
-	if (is.size > 0 && is.size - is.offset < 65536)
+	if (!is.KnownSize())
+		return false;
+
+	if (is.GetRest() < 65536)
 		return OggFindEOS(oy, os, packet);
 
 	if (!is.CheapSeeking())
 		return false;
 
-	return OggSeekPageAtOffset(oy, os, is, -65536, SEEK_END) &&
+	return OggSeekPageAtOffset(oy, os, is, is.GetSize() - 65536) &&
 		OggFindEOS(oy, os, packet);
 }
diff --git a/src/decoder/OggFind.hxx b/src/decoder/plugins/OggFind.hxx
index ad51ccdf3..2aa4f6c06 100644
--- a/src/decoder/OggFind.hxx
+++ b/src/decoder/plugins/OggFind.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,12 +21,12 @@
 #define MPD_OGG_FIND_HXX
 
 #include "check.h"
-#include "InputStream.hxx"
+#include "input/Offset.hxx"
 
 #include <ogg/ogg.h>
 
-struct InputStream;
 class OggSyncState;
+class InputStream;
 
 /**
  * Skip all pages/packets until an end-of-stream (EOS) packet for the
@@ -42,7 +42,7 @@ OggFindEOS(OggSyncState &oy, ogg_stream_state &os, ogg_packet &packet);
  */
 bool
 OggSeekPageAtOffset(OggSyncState &oy, ogg_stream_state &os, InputStream &is,
-		    InputStream::offset_type offset, int whence);
+		    offset_type offset);
 
 /**
  * Try to find the end-of-stream (EOS) packet.  Seek to the end of the
diff --git a/src/decoder/OggSyncState.hxx b/src/decoder/plugins/OggSyncState.hxx
index 5235c1bd8..024902fff 100644
--- a/src/decoder/OggSyncState.hxx
+++ b/src/decoder/plugins/OggSyncState.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OggUtil.cxx b/src/decoder/plugins/OggUtil.cxx
index 8f181ce57..6341b0008 100644
--- a/src/decoder/OggUtil.cxx
+++ b/src/decoder/plugins/OggUtil.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,7 +19,7 @@
 
 #include "config.h"
 #include "OggUtil.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 
 bool
 OggFeed(ogg_sync_state &oy, Decoder *decoder,
diff --git a/src/decoder/OggUtil.hxx b/src/decoder/plugins/OggUtil.hxx
index 41fc755ba..94c380ef4 100644
--- a/src/decoder/OggUtil.hxx
+++ b/src/decoder/plugins/OggUtil.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -26,7 +26,7 @@
 
 #include <stddef.h>
 
-struct InputStream;
+class InputStream;
 struct Decoder;
 
 /**
diff --git a/src/decoder/OpusDecoderPlugin.cxx b/src/decoder/plugins/OpusDecoderPlugin.cxx
index 01ea3687a..e14827e38 100644
--- a/src/decoder/OpusDecoderPlugin.cxx
+++ b/src/decoder/plugins/OpusDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,28 +22,30 @@
 #include "OpusDomain.hxx"
 #include "OpusHead.hxx"
 #include "OpusTags.hxx"
-#include "OggUtil.hxx"
 #include "OggFind.hxx"
 #include "OggSyncState.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "OggCodec.hxx"
-#include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagBuilder.hxx"
-#include "InputStream.hxx"
+#include "input/InputStream.hxx"
 #include "util/Error.hxx"
 #include "Log.hxx"
 
 #include <opus.h>
 #include <ogg/ogg.h>
 
-#include <glib.h>
-
 #include <string.h>
 #include <stdio.h>
 
 static constexpr opus_int32 opus_sample_rate = 48000;
 
+/**
+ * Allocate an output buffer for 16 bit PCM samples big enough to hold
+ * a quarter second, larger than 120ms required by libopus.
+ */
+static constexpr unsigned opus_output_buffer_frames = opus_sample_rate / 4;
+
 gcc_pure
 static bool
 IsOpusHead(const ogg_packet &packet)
@@ -74,10 +76,16 @@ class MPDOpusDecoder {
 
 	OpusDecoder *opus_decoder;
 	opus_int16 *output_buffer;
-	unsigned output_size;
+
+	/**
+	 * If non-zero, then a previous Opus stream has been found
+	 * already with this number of channels.  If opus_decoder is
+	 * nullptr, then its end-of-stream packet has been found
+	 * already.
+	 */
+	unsigned previous_channels;
 
 	bool os_initialized;
-	bool found_opus;
 
 	int opus_serialno;
 
@@ -90,8 +98,9 @@ public:
 		       InputStream &_input_stream)
 		:decoder(_decoder), input_stream(_input_stream),
 		 opus_decoder(nullptr),
-		 output_buffer(nullptr), output_size(0),
-		 os_initialized(false), found_opus(false) {}
+		 output_buffer(nullptr),
+		 previous_channels(0),
+		 os_initialized(false) {}
 	~MPDOpusDecoder();
 
 	bool ReadFirstPage(OggSyncState &oy);
@@ -100,15 +109,16 @@ public:
 	DecoderCommand HandlePackets();
 	DecoderCommand HandlePacket(const ogg_packet &packet);
 	DecoderCommand HandleBOS(const ogg_packet &packet);
+	DecoderCommand HandleEOS();
 	DecoderCommand HandleTags(const ogg_packet &packet);
 	DecoderCommand HandleAudio(const ogg_packet &packet);
 
-	bool Seek(OggSyncState &oy, double where);
+	bool Seek(OggSyncState &oy, uint64_t where_frame);
 };
 
 MPDOpusDecoder::~MPDOpusDecoder()
 {
-	g_free(output_buffer);
+	delete[] output_buffer;
 
 	if (opus_decoder != nullptr)
 		opus_decoder_destroy(opus_decoder);
@@ -163,12 +173,14 @@ inline DecoderCommand
 MPDOpusDecoder::HandlePacket(const ogg_packet &packet)
 {
 	if (packet.e_o_s)
-		return DecoderCommand::STOP;
+		return HandleEOS();
 
 	if (packet.b_o_s)
 		return HandleBOS(packet);
-	else if (!found_opus)
+	else if (opus_decoder == nullptr) {
+		LogDebug(opus_domain, "BOS packet expected");
 		return DecoderCommand::STOP;
+	}
 
 	if (IsOpusTags(packet))
 		return HandleTags(packet);
@@ -188,11 +200,9 @@ LoadEOSPacket(InputStream &is, Decoder *decoder, int serialno,
 		/* we do this for local files only, because seeking
 		   around remote files is expensive and not worth the
 		   troubl */
-		return -1;
+		return false;
 
-	const auto old_offset = is.offset;
-	if (old_offset < 0)
-		return -1;
+	const auto old_offset = is.GetOffset();
 
 	/* create temporary Ogg objects for seeking and parsing the
 	   EOS packet */
@@ -204,7 +214,7 @@ LoadEOSPacket(InputStream &is, Decoder *decoder, int serialno,
 	ogg_stream_clear(&os);
 
 	/* restore the previous file position */
-	is.Seek(old_offset, SEEK_SET, IgnoreError());
+	is.LockSeek(old_offset, IgnoreError());
 
 	return result;
 }
@@ -231,19 +241,29 @@ MPDOpusDecoder::HandleBOS(const ogg_packet &packet)
 {
 	assert(packet.b_o_s);
 
-	if (found_opus || !IsOpusHead(packet))
+	if (opus_decoder != nullptr || !IsOpusHead(packet)) {
+		LogDebug(opus_domain, "BOS packet must be OpusHead");
 		return DecoderCommand::STOP;
+	}
 
 	unsigned channels;
 	if (!ScanOpusHeader(packet.packet, packet.bytes, channels) ||
-	    !audio_valid_channel_count(channels))
+	    !audio_valid_channel_count(channels)) {
+		LogDebug(opus_domain, "Malformed BOS packet");
 		return DecoderCommand::STOP;
+	}
 
 	assert(opus_decoder == nullptr);
-	assert(output_buffer == nullptr);
+	assert((previous_channels == 0) == (output_buffer == nullptr));
+
+	if (previous_channels != 0 && channels != previous_channels) {
+		FormatWarning(opus_domain,
+			      "Next stream has different channels (%u -> %u)",
+			      previous_channels, channels);
+		return DecoderCommand::STOP;
+	}
 
 	opus_serialno = os.serialno;
-	found_opus = true;
 
 	/* TODO: parse attributes from the OpusHead (sample rate,
 	   channels, ...) */
@@ -257,30 +277,51 @@ MPDOpusDecoder::HandleBOS(const ogg_packet &packet)
 		return DecoderCommand::STOP;
 	}
 
+	if (previous_channels != 0) {
+		/* decoder was already initialized by the previous
+		   stream; skip the rest of this method */
+		LogDebug(opus_domain, "Found another stream");
+		return decoder_get_command(decoder);
+	}
+
 	eos_granulepos = LoadEOSGranulePos(input_stream, &decoder,
 					   opus_serialno);
-	const double duration = eos_granulepos >= 0
-		? double(eos_granulepos) / opus_sample_rate
-		: -1.0;
+	const auto duration = eos_granulepos >= 0
+		? SignedSongTime::FromScale<uint64_t>(eos_granulepos,
+						      opus_sample_rate)
+		: SignedSongTime::Negative();
 
+	previous_channels = channels;
 	const AudioFormat audio_format(opus_sample_rate,
 				       SampleFormat::S16, channels);
 	decoder_initialized(decoder, audio_format,
 			    eos_granulepos > 0, duration);
 	frame_size = audio_format.GetFrameSize();
 
-	/* allocate an output buffer for 16 bit PCM samples big enough
-	   to hold a quarter second, larger than 120ms required by
-	   libopus */
-	output_size = audio_format.sample_rate / 4;
-	output_buffer = (opus_int16 *)
-		g_malloc(sizeof(*output_buffer) * output_size *
-			 audio_format.channels);
+	output_buffer = new opus_int16[opus_output_buffer_frames
+				       * audio_format.channels];
 
 	return decoder_get_command(decoder);
 }
 
 inline DecoderCommand
+MPDOpusDecoder::HandleEOS()
+{
+	if (eos_granulepos < 0 && previous_channels != 0) {
+		/* allow chaining of (unseekable) streams */
+		assert(opus_decoder != nullptr);
+		assert(output_buffer != nullptr);
+
+		opus_decoder_destroy(opus_decoder);
+		opus_decoder = nullptr;
+
+		return decoder_get_command(decoder);
+	}
+
+	return DecoderCommand::STOP;
+}
+
+inline DecoderCommand
 MPDOpusDecoder::HandleTags(const ogg_packet &packet)
 {
 	ReplayGainInfo rgi;
@@ -295,8 +336,7 @@ MPDOpusDecoder::HandleTags(const ogg_packet &packet)
 	    !tag_builder.IsEmpty()) {
 		decoder_replay_gain(decoder, &rgi);
 
-		Tag tag;
-		tag_builder.Commit(tag);
+		Tag tag = tag_builder.Commit();
 		cmd = decoder_tag(decoder, input_stream, std::move(tag));
 	} else
 		cmd = decoder_get_command(decoder);
@@ -312,10 +352,11 @@ MPDOpusDecoder::HandleAudio(const ogg_packet &packet)
 	int nframes = opus_decode(opus_decoder,
 				  (const unsigned char*)packet.packet,
 				  packet.bytes,
-				  output_buffer, output_size,
+				  output_buffer, opus_output_buffer_frames,
 				  0);
 	if (nframes < 0) {
-		LogError(opus_domain, opus_strerror(nframes));
+		FormatError(opus_domain, "libopus error: %s",
+			    opus_strerror(nframes));
 		return DecoderCommand::STOP;
 	}
 
@@ -337,26 +378,21 @@ MPDOpusDecoder::HandleAudio(const ogg_packet &packet)
 }
 
 bool
-MPDOpusDecoder::Seek(OggSyncState &oy, double where_s)
+MPDOpusDecoder::Seek(OggSyncState &oy, uint64_t where_frame)
 {
 	assert(eos_granulepos > 0);
-	assert(input_stream.seekable);
-	assert(input_stream.size > 0);
-	assert(input_stream.offset >= 0);
+	assert(input_stream.IsSeekable());
+	assert(input_stream.KnownSize());
 
-	const ogg_int64_t where_granulepos(where_s * opus_sample_rate);
+	const ogg_int64_t where_granulepos(where_frame);
 
 	/* interpolate the file offset where we expect to find the
 	   given granule position */
 	/* TODO: implement binary search */
-	InputStream::offset_type offset(where_granulepos * input_stream.size
-					/ eos_granulepos);
-
-	if (!OggSeekPageAtOffset(oy, os, input_stream, offset, SEEK_SET))
-		return false;
+	offset_type offset(where_granulepos * input_stream.GetSize()
+			   / eos_granulepos);
 
-	decoder_timestamp(decoder, where_s);
-	return true;
+	return OggSeekPageAtOffset(oy, os, input_stream, offset);
 }
 
 static void
@@ -379,7 +415,7 @@ mpd_opus_stream_decode(Decoder &decoder,
 	while (true) {
 		auto cmd = d.HandlePackets();
 		if (cmd == DecoderCommand::SEEK) {
-			if (d.Seek(oy, decoder_seek_where(decoder)))
+			if (d.Seek(oy, decoder_seek_where_frame(decoder)))
 				decoder_command_finished(decoder);
 			else
 				decoder_seek_error(decoder);
@@ -454,9 +490,12 @@ mpd_opus_scan_stream(InputStream &is,
 		}
 	}
 
-	if (packet.e_o_s || OggSeekFindEOS(oy, os, packet, is))
-		tag_handler_invoke_duration(handler, handler_ctx,
-					    packet.granulepos / opus_sample_rate);
+	if (packet.e_o_s || OggSeekFindEOS(oy, os, packet, is)) {
+		const auto duration =
+			SongTime::FromScale<uint64_t>(packet.granulepos,
+						      opus_sample_rate);
+		tag_handler_invoke_duration(handler, handler_ctx, duration);
+	}
 
 	ogg_stream_clear(&os);
 
@@ -471,6 +510,13 @@ static const char *const opus_suffixes[] = {
 };
 
 static const char *const opus_mime_types[] = {
+	/* the official MIME type (RFC 5334) */
+	"audio/ogg",
+
+	/* deprecated (RFC 5334) */
+	"application/ogg",
+
+	/* deprecated; from an early draft */
 	"audio/opus",
 	nullptr
 };
diff --git a/src/decoder/OpusDecoderPlugin.h b/src/decoder/plugins/OpusDecoderPlugin.h
index 263ac6e2d..260dab99a 100644
--- a/src/decoder/OpusDecoderPlugin.h
+++ b/src/decoder/plugins/OpusDecoderPlugin.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusDomain.cxx b/src/decoder/plugins/OpusDomain.cxx
index b00e2a553..1efd64a48 100644
--- a/src/decoder/OpusDomain.cxx
+++ b/src/decoder/plugins/OpusDomain.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusDomain.hxx b/src/decoder/plugins/OpusDomain.hxx
index 2b56c427c..fb19e0301 100644
--- a/src/decoder/OpusDomain.hxx
+++ b/src/decoder/plugins/OpusDomain.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusHead.cxx b/src/decoder/plugins/OpusHead.cxx
index 0417d3905..bfa41d618 100644
--- a/src/decoder/OpusHead.cxx
+++ b/src/decoder/plugins/OpusHead.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,7 +21,6 @@
 #include "OpusHead.hxx"
 
 #include <stdint.h>
-#include <string.h>
 
 struct OpusHead {
 	char signature[8];
diff --git a/src/decoder/OpusHead.hxx b/src/decoder/plugins/OpusHead.hxx
index fa6a2b666..c478d8d90 100644
--- a/src/decoder/OpusHead.hxx
+++ b/src/decoder/plugins/OpusHead.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusReader.hxx b/src/decoder/plugins/OpusReader.hxx
index 2bb39b748..c5b8e9107 100644
--- a/src/decoder/OpusReader.hxx
+++ b/src/decoder/plugins/OpusReader.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusTags.cxx b/src/decoder/plugins/OpusTags.cxx
index f7729e5ad..aff5479c0 100644
--- a/src/decoder/OpusTags.cxx
+++ b/src/decoder/plugins/OpusTags.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/OpusTags.hxx b/src/decoder/plugins/OpusTags.hxx
index e1f1a1ff1..be3ac3a8d 100644
--- a/src/decoder/OpusTags.hxx
+++ b/src/decoder/plugins/OpusTags.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/PcmDecoderPlugin.cxx b/src/decoder/plugins/PcmDecoderPlugin.cxx
index dbc38fb76..c07a7b9b1 100644
--- a/src/decoder/PcmDecoderPlugin.cxx
+++ b/src/decoder/plugins/PcmDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -18,17 +18,14 @@
  */
 
 #include "config.h"
-#include "decoder/PcmDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "PcmDecoderPlugin.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "util/Error.hxx"
 #include "util/ByteReverse.hxx"
 #include "Log.hxx"
 
-#include <glib.h>
-#include <unistd.h>
 #include <string.h>
-#include <stdio.h> /* for SEEK_SET */
 
 static void
 pcm_stream_decode(Decoder &decoder, InputStream &is)
@@ -43,12 +40,12 @@ pcm_stream_decode(Decoder &decoder, InputStream &is)
 	const bool reverse_endian = mime != nullptr &&
 		strcmp(mime, "audio/x-mpd-cdda-pcm-reverse") == 0;
 
-	const double time_to_size = audio_format.GetTimeToSize();
+	const auto frame_size = audio_format.GetFrameSize();
 
-	float total_time = -1;
-	const auto size = is.GetSize();
-	if (size >= 0)
-		total_time = size / time_to_size;
+	const auto total_time = is.KnownSize()
+		? SignedSongTime::FromScale<uint64_t>(is.GetSize() / frame_size,
+						      audio_format.sample_rate)
+		: SignedSongTime::Negative();
 
 	decoder_initialized(decoder, audio_format,
 			    is.IsSeekable(), total_time);
@@ -74,11 +71,11 @@ pcm_stream_decode(Decoder &decoder, InputStream &is)
 				       buffer, nbytes, 0)
 			: decoder_get_command(decoder);
 		if (cmd == DecoderCommand::SEEK) {
-			InputStream::offset_type offset(time_to_size *
-							decoder_seek_where(decoder));
+			uint64_t frame = decoder_seek_where_frame(decoder);
+			offset_type offset = frame * frame_size;
 
 			Error error;
-			if (is.LockSeek(offset, SEEK_SET, error)) {
+			if (is.LockSeek(offset, error)) {
 				decoder_command_finished(decoder);
 			} else {
 				LogError(error);
diff --git a/src/decoder/PcmDecoderPlugin.hxx b/src/decoder/plugins/PcmDecoderPlugin.hxx
index 38e4a5020..3582e5856 100644
--- a/src/decoder/PcmDecoderPlugin.hxx
+++ b/src/decoder/plugins/PcmDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/SidplayDecoderPlugin.cxx b/src/decoder/plugins/SidplayDecoderPlugin.cxx
index 160337594..8435f095f 100644
--- a/src/decoder/SidplayDecoderPlugin.cxx
+++ b/src/decoder/plugins/SidplayDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,6 +21,8 @@
 #include "SidplayDecoderPlugin.hxx"
 #include "../DecoderAPI.hxx"
 #include "tag/TagHandler.hxx"
+#include "fs/Path.hxx"
+#include "util/FormatString.hxx"
 #include "util/Domain.hxx"
 #include "system/ByteOrder.hxx"
 #include "Log.hxx"
@@ -119,9 +121,9 @@ sidplay_finish()
  * suffix
  */
 static char *
-get_container_name(const char *path_fs)
+get_container_name(Path path_fs)
 {
-	char *path_container=g_strdup(path_fs);
+	char *path_container = strdup(path_fs.c_str());
 
 	if(!g_pattern_match(path_with_subtune,
 		strlen(path_container), path_container, nullptr))
@@ -157,31 +159,31 @@ get_song_num(const char *path_fs)
 }
 
 /* get the song length in seconds */
-static int
-get_song_length(const char *path_fs)
+static SignedSongTime
+get_song_length(Path path_fs)
 {
 	if (songlength_database == nullptr)
-		return -1;
+		return SignedSongTime::Negative();
 
-	gchar *sid_file=get_container_name(path_fs);
+	char *sid_file = get_container_name(path_fs);
 	SidTuneMod tune(sid_file);
-	g_free(sid_file);
+	free(sid_file);
 	if(!tune) {
 		LogWarning(sidplay_domain,
 			   "failed to load file for calculating md5 sum");
-		return -1;
+		return SignedSongTime::Negative();
 	}
 	char md5sum[SIDTUNE_MD5_LENGTH+1];
 	tune.createMD5(md5sum);
 
-	const unsigned song_num = get_song_num(path_fs);
+	const unsigned song_num = get_song_num(path_fs.c_str());
 
 	gsize num_items;
 	gchar **values=g_key_file_get_string_list(songlength_database,
 		"Database", md5sum, &num_items, nullptr);
 	if(!values || song_num>num_items) {
 		g_strfreev(values);
-		return -1;
+		return SignedSongTime::Negative();
 	}
 
 	int minutes=strtol(values[song_num-1], nullptr, 10);
@@ -197,11 +199,11 @@ get_song_length(const char *path_fs)
 
 	g_strfreev(values);
 
-	return (minutes*60)+seconds;
+	return SignedSongTime::FromS((minutes * 60) + seconds);
 }
 
 static void
-sidplay_file_decode(Decoder &decoder, const char *path_fs)
+sidplay_file_decode(Decoder &decoder, Path path_fs)
 {
 	int channels;
 
@@ -209,17 +211,18 @@ sidplay_file_decode(Decoder &decoder, const char *path_fs)
 
 	char *path_container=get_container_name(path_fs);
 	SidTune tune(path_container, nullptr, true);
-	g_free(path_container);
+	free(path_container);
 	if (!tune) {
 		LogWarning(sidplay_domain, "failed to load file");
 		return;
 	}
 
-	int song_num=get_song_num(path_fs);
+	const int song_num = get_song_num(path_fs.c_str());
 	tune.selectSong(song_num);
 
-	int song_len=get_song_length(path_fs);
-	if(song_len==-1) song_len=default_songlength;
+	auto duration = get_song_length(path_fs);
+	if (duration.IsNegative() && default_songlength > 0)
+		duration = SongTime::FromS(default_songlength);
 
 	/* initialize the player */
 
@@ -290,12 +293,14 @@ sidplay_file_decode(Decoder &decoder, const char *path_fs)
 	const AudioFormat audio_format(48000, SampleFormat::S16, channels);
 	assert(audio_format.IsValid());
 
-	decoder_initialized(decoder, audio_format, true, (float)song_len);
+	decoder_initialized(decoder, audio_format, true, duration);
 
 	/* .. and play */
 
 	const unsigned timebase = player.timebase();
-	song_len *= timebase;
+	const unsigned end = duration.IsNegative()
+		? 0u
+		: duration.ToScale<uint64_t>(timebase);
 
 	DecoderCommand cmd;
 	do {
@@ -312,8 +317,8 @@ sidplay_file_decode(Decoder &decoder, const char *path_fs)
 
 		if (cmd == DecoderCommand::SEEK) {
 			unsigned data_time = player.time();
-			unsigned target_time = (unsigned)
-				(decoder_seek_where(decoder) * timebase);
+			unsigned target_time =
+				decoder_seek_time(decoder).ToScale(timebase);
 
 			/* can't rewind so return to zero and seek forward */
 			if(target_time<data_time) {
@@ -332,21 +337,21 @@ sidplay_file_decode(Decoder &decoder, const char *path_fs)
 			decoder_command_finished(decoder);
 		}
 
-		if (song_len > 0 && player.time() >= (unsigned)song_len)
+		if (end > 0 && player.time() >= end)
 			break;
 
 	} while (cmd != DecoderCommand::STOP);
 }
 
 static bool
-sidplay_scan_file(const char *path_fs,
+sidplay_scan_file(Path path_fs,
 		  const struct tag_handler *handler, void *handler_ctx)
 {
-	int song_num=get_song_num(path_fs);
+	const int song_num = get_song_num(path_fs.c_str());
 	char *path_container=get_container_name(path_fs);
 
 	SidTune tune(path_container, nullptr, true);
-	g_free(path_container);
+	free(path_container);
 	if (!tune)
 		return false;
 
@@ -380,17 +385,18 @@ sidplay_scan_file(const char *path_fs,
 	tag_handler_invoke_tag(handler, handler_ctx, TAG_TRACK, track);
 
 	/* time */
-	int song_len=get_song_length(path_fs);
-	if (song_len >= 0)
-		tag_handler_invoke_duration(handler, handler_ctx, song_len);
+	const auto duration = get_song_length(path_fs);
+	if (!duration.IsNegative())
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    SongTime(duration));
 
 	return true;
 }
 
 static char *
-sidplay_container_scan(const char *path_fs, const unsigned int tnum)
+sidplay_container_scan(Path path_fs, const unsigned int tnum)
 {
-	SidTune tune(path_fs, nullptr, true);
+	SidTune tune(path_fs.c_str(), nullptr, true);
 	if (!tune)
 		return nullptr;
 
@@ -404,9 +410,7 @@ sidplay_container_scan(const char *path_fs, const unsigned int tnum)
 	/* Construct container/tune path names, eg.
 		Delta.sid/tune_001.sid */
 	if(tnum<=info.songs) {
-		char *subtune= g_strdup_printf(
-			SUBTUNE_PREFIX "%03u.sid", tnum);
-		return subtune;
+		return FormatNew(SUBTUNE_PREFIX "%03u.sid", tnum);
 	} else
 		return nullptr;
 }
diff --git a/src/decoder/SidplayDecoderPlugin.hxx b/src/decoder/plugins/SidplayDecoderPlugin.hxx
index 16544801f..58786e646 100644
--- a/src/decoder/SidplayDecoderPlugin.hxx
+++ b/src/decoder/plugins/SidplayDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/SndfileDecoderPlugin.cxx b/src/decoder/plugins/SndfileDecoderPlugin.cxx
index bcdf6d7ca..5518c70be 100644
--- a/src/decoder/SndfileDecoderPlugin.cxx
+++ b/src/decoder/plugins/SndfileDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,8 +19,8 @@
 
 #include "config.h"
 #include "SndfileDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "util/Error.hxx"
@@ -31,6 +31,13 @@
 
 static constexpr Domain sndfile_domain("sndfile");
 
+static bool
+sndfile_init(gcc_unused const config_param &param)
+{
+       LogDebug(sndfile_domain, sf_version_string());
+       return true;
+}
+
 struct SndfileInputStream {
 	Decoder *const decoder;
 	InputStream &is;
@@ -50,17 +57,40 @@ sndfile_vio_get_filelen(void *user_data)
 	SndfileInputStream &sis = *(SndfileInputStream *)user_data;
 	const InputStream &is = sis.is;
 
+	if (!is.KnownSize())
+		return -1;
+
 	return is.GetSize();
 }
 
 static sf_count_t
-sndfile_vio_seek(sf_count_t offset, int whence, void *user_data)
+sndfile_vio_seek(sf_count_t _offset, int whence, void *user_data)
 {
 	SndfileInputStream &sis = *(SndfileInputStream *)user_data;
 	InputStream &is = sis.is;
 
+	offset_type offset = _offset;
+	switch (whence) {
+	case SEEK_SET:
+		break;
+
+	case SEEK_CUR:
+		offset += is.GetOffset();
+		break;
+
+	case SEEK_END:
+		if (!is.KnownSize())
+			return -1;
+
+		offset += is.GetSize();
+		break;
+
+	default:
+		return -1;
+	}
+
 	Error error;
-	if (!is.LockSeek(offset, whence, error)) {
+	if (!is.LockSeek(offset, error)) {
 		LogError(error, "Seek failed");
 		return -1;
 	}
@@ -109,60 +139,89 @@ static SF_VIRTUAL_IO vio = {
 /**
  * Converts a frame number to a timestamp (in seconds).
  */
-static float
-frame_to_time(sf_count_t frame, const AudioFormat *audio_format)
+static constexpr SongTime
+sndfile_duration(const SF_INFO &info)
 {
-	return (float)frame / (float)audio_format->sample_rate;
+	return SongTime::FromScale<uint64_t>(info.frames, info.samplerate);
+}
+
+gcc_pure
+static SampleFormat
+sndfile_sample_format(const SF_INFO &info)
+{
+	switch (info.format & SF_FORMAT_SUBMASK) {
+	case SF_FORMAT_PCM_S8:
+	case SF_FORMAT_PCM_U8:
+	case SF_FORMAT_PCM_16:
+		return SampleFormat::S16;
+
+	case SF_FORMAT_FLOAT:
+	case SF_FORMAT_DOUBLE:
+		return SampleFormat::FLOAT;
+
+	default:
+		return SampleFormat::S32;
+	}
 }
 
-/**
- * Converts a timestamp (in seconds) to a frame number.
- */
 static sf_count_t
-time_to_frame(float t, const AudioFormat *audio_format)
+sndfile_read_frames(SNDFILE *sf, SampleFormat format,
+		    void *buffer, sf_count_t n_frames)
 {
-	return (sf_count_t)(t * audio_format->sample_rate);
+	switch (format) {
+	case SampleFormat::S16:
+		return sf_readf_short(sf, (short *)buffer, n_frames);
+
+	case SampleFormat::S32:
+		return sf_readf_int(sf, (int *)buffer, n_frames);
+
+	case SampleFormat::FLOAT:
+		return sf_readf_float(sf, (float *)buffer, n_frames);
+
+	default:
+		assert(false);
+		gcc_unreachable();
+	}
 }
 
 static void
 sndfile_stream_decode(Decoder &decoder, InputStream &is)
 {
-	SNDFILE *sf;
 	SF_INFO info;
-	size_t frame_size;
-	sf_count_t read_frames, num_frames;
-	int buffer[4096];
 
 	info.format = 0;
 
 	SndfileInputStream sis{&decoder, is};
-	sf = sf_open_virtual(&vio, SFM_READ, &info, &sis);
+	SNDFILE *const sf = sf_open_virtual(&vio, SFM_READ, &info, &sis);
 	if (sf == nullptr) {
-		LogWarning(sndfile_domain, "sf_open_virtual() failed");
+		FormatWarning(sndfile_domain, "sf_open_virtual() failed: %s",
+			      sf_strerror(nullptr));
 		return;
 	}
 
-	/* for now, always read 32 bit samples.  Later, we could lower
-	   MPD's CPU usage by reading 16 bit samples with
-	   sf_readf_short() on low-quality source files. */
 	Error error;
 	AudioFormat audio_format;
 	if (!audio_format_init_checked(audio_format, info.samplerate,
-				       SampleFormat::S32,
+				       sndfile_sample_format(info),
 				       info.channels, error)) {
 		LogError(error);
 		return;
 	}
 
 	decoder_initialized(decoder, audio_format, info.seekable,
-			    frame_to_time(info.frames, &audio_format));
+			    sndfile_duration(info));
 
-	frame_size = audio_format.GetFrameSize();
-	read_frames = sizeof(buffer) / frame_size;
+	char buffer[16384];
+
+	const size_t frame_size = audio_format.GetFrameSize();
+	const sf_count_t read_frames = sizeof(buffer) / frame_size;
 
 	DecoderCommand cmd;
 	do {
-		num_frames = sf_readf_int(sf, buffer, read_frames);
+		sf_count_t num_frames =
+			sndfile_read_frames(sf,
+					    audio_format.format,
+					    buffer, read_frames);
 		if (num_frames <= 0)
 			break;
 
@@ -170,9 +229,7 @@ sndfile_stream_decode(Decoder &decoder, InputStream &is)
 				   buffer, num_frames * frame_size,
 				   0);
 		if (cmd == DecoderCommand::SEEK) {
-			sf_count_t c =
-				time_to_frame(decoder_seek_where(decoder),
-					      &audio_format);
+			sf_count_t c = decoder_seek_where_frame(decoder);
 			c = sf_seek(sf, c, SEEK_SET);
 			if (c < 0)
 				decoder_seek_error(decoder);
@@ -185,44 +242,53 @@ sndfile_stream_decode(Decoder &decoder, InputStream &is)
 	sf_close(sf);
 }
 
+static void
+sndfile_handle_tag(SNDFILE *sf, int str, TagType tag,
+		   const struct tag_handler *handler, void *handler_ctx)
+{
+	const char *value = sf_get_string(sf, str);
+	if (value != nullptr)
+		tag_handler_invoke_tag(handler, handler_ctx, tag, value);
+}
+
+static constexpr struct {
+	int8_t str;
+	TagType tag;
+} sndfile_tags[] = {
+	{ SF_STR_TITLE, TAG_TITLE },
+	{ SF_STR_ARTIST, TAG_ARTIST },
+	{ SF_STR_COMMENT, TAG_COMMENT },
+	{ SF_STR_DATE, TAG_DATE },
+	{ SF_STR_ALBUM, TAG_ALBUM },
+	{ SF_STR_TRACKNUMBER, TAG_TRACK },
+	{ SF_STR_GENRE, TAG_GENRE },
+};
+
 static bool
-sndfile_scan_file(const char *path_fs,
-		  const struct tag_handler *handler, void *handler_ctx)
+sndfile_scan_stream(InputStream &is,
+		    const struct tag_handler *handler, void *handler_ctx)
 {
-	SNDFILE *sf;
 	SF_INFO info;
-	const char *p;
 
 	info.format = 0;
 
-	sf = sf_open(path_fs, SFM_READ, &info);
+	SndfileInputStream sis{nullptr, is};
+	SNDFILE *const sf = sf_open_virtual(&vio, SFM_READ, &info, &sis);
 	if (sf == nullptr)
 		return false;
 
 	if (!audio_valid_sample_rate(info.samplerate)) {
 		sf_close(sf);
 		FormatWarning(sndfile_domain,
-			      "Invalid sample rate in %s", path_fs);
+			      "Invalid sample rate in %s", is.GetURI());
 		return false;
 	}
 
 	tag_handler_invoke_duration(handler, handler_ctx,
-				    info.frames / info.samplerate);
-
-	p = sf_get_string(sf, SF_STR_TITLE);
-	if (p != nullptr)
-		tag_handler_invoke_tag(handler, handler_ctx,
-				       TAG_TITLE, p);
+				    sndfile_duration(info));
 
-	p = sf_get_string(sf, SF_STR_ARTIST);
-	if (p != nullptr)
-		tag_handler_invoke_tag(handler, handler_ctx,
-				       TAG_ARTIST, p);
-
-	p = sf_get_string(sf, SF_STR_DATE);
-	if (p != nullptr)
-		tag_handler_invoke_tag(handler, handler_ctx,
-				       TAG_DATE, p);
+	for (auto i : sndfile_tags)
+		sndfile_handle_tag(sf, i.str, i.tag, handler, handler_ctx);
 
 	sf_close(sf);
 
@@ -261,12 +327,12 @@ static const char *const sndfile_mime_types[] = {
 
 const struct DecoderPlugin sndfile_decoder_plugin = {
 	"sndfile",
-	nullptr,
+	sndfile_init,
 	nullptr,
 	sndfile_stream_decode,
 	nullptr,
-	sndfile_scan_file,
 	nullptr,
+	sndfile_scan_stream,
 	nullptr,
 	sndfile_suffixes,
 	sndfile_mime_types,
diff --git a/src/decoder/SndfileDecoderPlugin.hxx b/src/decoder/plugins/SndfileDecoderPlugin.hxx
index f8aa65680..d56acdd5a 100644
--- a/src/decoder/SndfileDecoderPlugin.hxx
+++ b/src/decoder/plugins/SndfileDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/VorbisComments.cxx b/src/decoder/plugins/VorbisComments.cxx
index d4f019b58..062f46acf 100644
--- a/src/decoder/VorbisComments.cxx
+++ b/src/decoder/plugins/VorbisComments.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,58 +20,28 @@
 #include "config.h"
 #include "VorbisComments.hxx"
 #include "XiphTags.hxx"
-#include "tag/Tag.hxx"
 #include "tag/TagTable.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/TagBuilder.hxx"
+#include "tag/VorbisComment.hxx"
+#include "tag/ReplayGain.hxx"
 #include "ReplayGainInfo.hxx"
 #include "util/ASCII.hxx"
+#include "util/SplitString.hxx"
 
-#include <glib.h>
-
-#include <assert.h>
 #include <stddef.h>
-#include <string.h>
 #include <stdlib.h>
 
-static const char *
-vorbis_comment_value(const char *comment, const char *needle)
-{
-	size_t len = strlen(needle);
-
-	if (StringEqualsCaseASCII(comment, needle, len) &&
-	    comment[len] == '=')
-		return comment + len + 1;
-
-	return nullptr;
-}
-
 bool
 vorbis_comments_to_replay_gain(ReplayGainInfo &rgi, char **comments)
 {
 	rgi.Clear();
 
-	const char *temp;
 	bool found = false;
 
 	while (*comments) {
-		if ((temp =
-		     vorbis_comment_value(*comments, "replaygain_track_gain"))) {
-			rgi.tuples[REPLAY_GAIN_TRACK].gain = atof(temp);
+		if (ParseReplayGainVorbis(rgi, *comments))
 			found = true;
-		} else if ((temp = vorbis_comment_value(*comments,
-							"replaygain_album_gain"))) {
-			rgi.tuples[REPLAY_GAIN_ALBUM].gain = atof(temp);
-			found = true;
-		} else if ((temp = vorbis_comment_value(*comments,
-							"replaygain_track_peak"))) {
-			rgi.tuples[REPLAY_GAIN_TRACK].peak = atof(temp);
-			found = true;
-		} else if ((temp = vorbis_comment_value(*comments,
-							"replaygain_album_peak"))) {
-			rgi.tuples[REPLAY_GAIN_ALBUM].peak = atof(temp);
-			found = true;
-		}
 
 		comments++;
 	}
@@ -104,16 +74,11 @@ vorbis_scan_comment(const char *comment,
 		    const struct tag_handler *handler, void *handler_ctx)
 {
 	if (handler->pair != nullptr) {
-		char *name = g_strdup((const char*)comment);
-		char *value = strchr(name, '=');
-
-		if (value != nullptr && value > name) {
-			*value++ = 0;
+		const SplitString split(comment, '=');
+		if (split.IsDefined() && !split.IsEmpty())
 			tag_handler_invoke_pair(handler, handler_ctx,
-						name, value);
-		}
-
-		g_free(name);
+						split.GetFirst(),
+						split.GetSecond());
 	}
 
 	for (const struct tag_table *i = xiph_tags; i->name != nullptr; ++i)
@@ -145,5 +110,5 @@ vorbis_comments_to_tag(char **comments)
 	vorbis_comments_scan(comments, &add_tag_handler, &tag_builder);
 	return tag_builder.IsEmpty()
 		? nullptr
-		: tag_builder.Commit();
+		: tag_builder.CommitNew();
 }
diff --git a/src/decoder/VorbisComments.hxx b/src/decoder/plugins/VorbisComments.hxx
index e5a48ef6b..893c89277 100644
--- a/src/decoder/VorbisComments.hxx
+++ b/src/decoder/plugins/VorbisComments.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -31,7 +31,7 @@ vorbis_comments_to_replay_gain(ReplayGainInfo &rgi, char **comments);
 
 void
 vorbis_comments_scan(char **comments,
-		     const struct tag_handler *handler, void *handler_ctx);
+		     const tag_handler *handler, void *handler_ctx);
 
 Tag *
 vorbis_comments_to_tag(char **comments);
diff --git a/src/decoder/VorbisDecoderPlugin.cxx b/src/decoder/plugins/VorbisDecoderPlugin.cxx
index 4d3e48528..e0d3d1374 100644
--- a/src/decoder/VorbisDecoderPlugin.cxx
+++ b/src/decoder/plugins/VorbisDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -21,13 +21,11 @@
 #include "VorbisDecoderPlugin.h"
 #include "VorbisComments.hxx"
 #include "VorbisDomain.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "OggCodec.hxx"
 #include "util/Error.hxx"
-#include "util/UriUtil.hxx"
 #include "util/Macros.hxx"
-#include "system/ByteOrder.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "Log.hxx"
@@ -48,20 +46,23 @@
 #define ov_time_seek_page(VF, S) (ov_time_seek_page(VF, (S)*1000))
 #endif /* HAVE_TREMOR */
 
-#include <assert.h>
 #include <errno.h>
 
-struct vorbis_input_stream {
-	Decoder *decoder;
+struct VorbisInputStream {
+	Decoder *const decoder;
 
-	InputStream *input_stream;
+	InputStream &input_stream;
 	bool seekable;
+
+	VorbisInputStream(Decoder *_decoder, InputStream &_is)
+		:decoder(_decoder), input_stream(_is),
+		 seekable(input_stream.CheapSeeking()) {}
 };
 
 static size_t ogg_read_cb(void *ptr, size_t size, size_t nmemb, void *data)
 {
-	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
-	size_t ret = decoder_read(vis->decoder, *vis->input_stream,
+	VorbisInputStream *vis = (VorbisInputStream *)data;
+	size_t ret = decoder_read(vis->decoder, vis->input_stream,
 				  ptr, size * nmemb);
 
 	errno = 0;
@@ -69,15 +70,37 @@ static size_t ogg_read_cb(void *ptr, size_t size, size_t nmemb, void *data)
 	return ret / size;
 }
 
-static int ogg_seek_cb(void *data, ogg_int64_t offset, int whence)
+static int ogg_seek_cb(void *data, ogg_int64_t _offset, int whence)
 {
-	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
+	VorbisInputStream *vis = (VorbisInputStream *)data;
+	InputStream &is = vis->input_stream;
 
-	Error error;
-	return vis->seekable &&
-		(vis->decoder == nullptr ||
-		 decoder_get_command(*vis->decoder) != DecoderCommand::STOP) &&
-		vis->input_stream->LockSeek(offset, whence, error)
+	if (!vis->seekable ||
+	    (vis->decoder != nullptr &&
+	     decoder_get_command(*vis->decoder) == DecoderCommand::STOP))
+		return -1;
+
+	offset_type offset = _offset;
+	switch (whence) {
+	case SEEK_SET:
+		break;
+
+	case SEEK_CUR:
+		offset += is.GetOffset();
+		break;
+
+	case SEEK_END:
+		if (!is.KnownSize())
+			return -1;
+
+		offset += is.GetSize();
+		break;
+
+	default:
+		return -1;
+	}
+
+	return is.LockSeek(offset, IgnoreError())
 		? 0 : -1;
 }
 
@@ -89,9 +112,9 @@ static int ogg_close_cb(gcc_unused void *data)
 
 static long ogg_tell_cb(void *data)
 {
-	struct vorbis_input_stream *vis = (struct vorbis_input_stream *)data;
+	VorbisInputStream *vis = (VorbisInputStream *)data;
 
-	return (long)vis->input_stream->offset;
+	return (long)vis->input_stream.GetOffset();
 }
 
 static const ov_callbacks vorbis_is_callbacks = {
@@ -126,17 +149,12 @@ vorbis_strerror(int code)
 }
 
 static bool
-vorbis_is_open(struct vorbis_input_stream *vis, OggVorbis_File *vf,
-	       Decoder *decoder, InputStream &input_stream)
+vorbis_is_open(VorbisInputStream *vis, OggVorbis_File *vf)
 {
-	vis->decoder = decoder;
-	vis->input_stream = &input_stream;
-	vis->seekable = input_stream.CheapSeeking();
-
 	int ret = ov_open_callbacks(vis, vf, nullptr, 0, vorbis_is_callbacks);
 	if (ret < 0) {
-		if (decoder == nullptr ||
-		    decoder_get_command(*decoder) == DecoderCommand::NONE)
+		if (vis->decoder == nullptr ||
+		    decoder_get_command(*vis->decoder) == DecoderCommand::NONE)
 			FormatWarning(vorbis_domain,
 				      "Failed to open Ogg Vorbis stream: %s",
 				      vorbis_strerror(ret));
@@ -165,8 +183,8 @@ vorbis_interleave(float *dest, const float *const*src,
 {
 	for (const float *const*src_end = src + channels;
 	     src != src_end; ++src, ++dest) {
-		float *d = dest;
-		for (const float *s = *src, *s_end = s + nframes;
+		float *gcc_restrict d = dest;
+		for (const float *gcc_restrict s = *src, *s_end = s + nframes;
 		     s != s_end; ++s, d += channels)
 			*d = *s;
 	}
@@ -174,6 +192,26 @@ vorbis_interleave(float *dest, const float *const*src,
 #endif
 
 /* public */
+
+static bool
+vorbis_init(gcc_unused const config_param &param)
+{
+#ifndef HAVE_TREMOR
+	LogDebug(vorbis_domain, vorbis_version_string());
+#endif
+	return true;
+}
+
+gcc_pure
+static SignedSongTime
+vorbis_duration(OggVorbis_File &vf)
+{
+	auto total = ov_time_total(&vf, -1);
+	return total >= 0
+		? SignedSongTime::FromS(total)
+		: SignedSongTime::Negative();
+}
+
 static void
 vorbis_stream_decode(Decoder &decoder,
 		     InputStream &input_stream)
@@ -185,9 +223,9 @@ vorbis_stream_decode(Decoder &decoder,
 	   moved it */
 	input_stream.LockRewind(IgnoreError());
 
-	struct vorbis_input_stream vis;
+	VorbisInputStream vis(&decoder, input_stream);
 	OggVorbis_File vf;
-	if (!vorbis_is_open(&vis, &vf, &decoder, input_stream))
+	if (!vorbis_is_open(&vis, &vf))
 		return;
 
 	const vorbis_info *vi = ov_info(&vf, -1);
@@ -209,11 +247,8 @@ vorbis_stream_decode(Decoder &decoder,
 		return;
 	}
 
-	float total_time = ov_time_total(&vf, -1);
-	if (total_time < 0)
-		total_time = 0;
-
-	decoder_initialized(decoder, audio_format, vis.seekable, total_time);
+	decoder_initialized(decoder, audio_format, vis.seekable,
+			    vorbis_duration(vf));
 
 #ifdef HAVE_TREMOR
 	char buffer[4096];
@@ -230,8 +265,8 @@ vorbis_stream_decode(Decoder &decoder,
 	DecoderCommand cmd = decoder_get_command(decoder);
 	do {
 		if (cmd == DecoderCommand::SEEK) {
-			double seek_where = decoder_seek_where(decoder);
-			if (0 == ov_time_seek_page(&vf, seek_where)) {
+			auto seek_where = decoder_seek_where_frame(decoder);
+			if (0 == ov_pcm_seek_page(&vf, seek_where)) {
 				decoder_command_finished(decoder);
 			} else
 				decoder_seek_error(decoder);
@@ -306,14 +341,16 @@ static bool
 vorbis_scan_stream(InputStream &is,
 		   const struct tag_handler *handler, void *handler_ctx)
 {
-	struct vorbis_input_stream vis;
+	VorbisInputStream vis(nullptr, is);
 	OggVorbis_File vf;
 
-	if (!vorbis_is_open(&vis, &vf, nullptr, is))
+	if (!vorbis_is_open(&vis, &vf))
 		return false;
 
-	tag_handler_invoke_duration(handler, handler_ctx,
-				    (int)(ov_time_total(&vf, -1) + 0.5));
+	const auto total = ov_time_total(&vf, -1);
+	if (total >= 0)
+		tag_handler_invoke_duration(handler, handler_ctx,
+					    SongTime::FromS(total));
 
 	vorbis_comments_scan(ov_comment(&vf, -1)->user_comments,
 			     handler, handler_ctx);
@@ -340,7 +377,7 @@ static const char *const vorbis_mime_types[] = {
 
 const struct DecoderPlugin vorbis_decoder_plugin = {
 	"vorbis",
-	nullptr,
+	vorbis_init,
 	nullptr,
 	vorbis_stream_decode,
 	nullptr,
diff --git a/src/decoder/VorbisDecoderPlugin.h b/src/decoder/plugins/VorbisDecoderPlugin.h
index 54953d83a..b54df2e97 100644
--- a/src/decoder/VorbisDecoderPlugin.h
+++ b/src/decoder/plugins/VorbisDecoderPlugin.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2012 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/VorbisDomain.cxx b/src/decoder/plugins/VorbisDomain.cxx
index 32ff4d6b7..e3d880efa 100644
--- a/src/decoder/VorbisDomain.cxx
+++ b/src/decoder/plugins/VorbisDomain.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/VorbisDomain.hxx b/src/decoder/plugins/VorbisDomain.hxx
index a35edd041..48715e328 100644
--- a/src/decoder/VorbisDomain.hxx
+++ b/src/decoder/plugins/VorbisDomain.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,6 +22,8 @@
 
 #include "check.h"
 
-extern const class Domain vorbis_domain;
+class Domain;
+
+extern const Domain vorbis_domain;
 
 #endif
diff --git a/src/decoder/WavpackDecoderPlugin.cxx b/src/decoder/plugins/WavpackDecoderPlugin.cxx
index 98555c5e8..67859bbd2 100644
--- a/src/decoder/WavpackDecoderPlugin.cxx
+++ b/src/decoder/plugins/WavpackDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,11 +19,12 @@
 
 #include "config.h"
 #include "WavpackDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
-#include "InputStream.hxx"
+#include "../DecoderAPI.hxx"
+#include "input/InputStream.hxx"
 #include "CheckAudioFormat.hxx"
 #include "tag/TagHandler.hxx"
 #include "tag/ApeTag.hxx"
+#include "fs/Path.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "util/Macros.hxx"
@@ -159,8 +160,9 @@ wavpack_decode(Decoder &decoder, WavpackContext *wpc, bool can_seek)
 		? format_samples_float
 		: format_samples_int;
 
-	const float total_time = float(WavpackGetNumSamples(wpc))
-		/ audio_format.sample_rate;
+	const auto total_time =
+		SongTime::FromScale<uint64_t>(WavpackGetNumSamples(wpc),
+					      audio_format.sample_rate);
 
 	const int bytes_per_sample = WavpackGetBytesPerSample(wpc);
 	const int output_sample_size = audio_format.GetFrameSize();
@@ -176,8 +178,7 @@ wavpack_decode(Decoder &decoder, WavpackContext *wpc, bool can_seek)
 	while (cmd != DecoderCommand::STOP) {
 		if (cmd == DecoderCommand::SEEK) {
 			if (can_seek) {
-				unsigned where = decoder_seek_where(decoder) *
-					audio_format.sample_rate;
+				auto where = decoder_seek_where_frame(decoder);
 
 				if (WavpackSeekSample(wpc, where)) {
 					decoder_command_finished(decoder);
@@ -269,21 +270,23 @@ wavpack_scan_pair(WavpackContext *wpc, const char *name,
  * Reads metainfo from the specified file.
  */
 static bool
-wavpack_scan_file(const char *fname,
+wavpack_scan_file(Path path_fs,
 		  const struct tag_handler *handler, void *handler_ctx)
 {
 	char error[ERRORLEN];
-	WavpackContext *wpc = WavpackOpenFileInput(fname, error, OPEN_TAGS, 0);
+	WavpackContext *wpc = WavpackOpenFileInput(path_fs.c_str(), error,
+						   OPEN_TAGS, 0);
 	if (wpc == nullptr) {
 		FormatError(wavpack_domain,
 			    "failed to open WavPack file \"%s\": %s",
-			    fname, error);
+			    path_fs.c_str(), error);
 		return false;
 	}
 
-	tag_handler_invoke_duration(handler, handler_ctx,
-				    WavpackGetNumSamples(wpc) /
-				    WavpackGetSampleRate(wpc));
+	const auto duration =
+		SongTime::FromScale<uint64_t>(WavpackGetNumSamples(wpc),
+					      WavpackGetSampleRate(wpc));
+	tag_handler_invoke_duration(handler, handler_ctx, duration);
 
 	/* the WavPack format implies APEv2 tags, which means we can
 	   reuse the mapping from tag_ape.c */
@@ -323,32 +326,43 @@ wavpack_scan_file(const char *fname,
  */
 
 /* This struct is needed for per-stream last_byte storage. */
-struct wavpack_input {
-	Decoder *decoder;
-	InputStream *is;
+struct WavpackInput {
+	Decoder &decoder;
+	InputStream &is;
 	/* Needed for push_back_byte() */
 	int last_byte;
+
+	constexpr WavpackInput(Decoder &_decoder, InputStream &_is)
+		:decoder(_decoder), is(_is), last_byte(EOF) {}
+
+	int32_t ReadBytes(void *data, size_t bcount);
 };
 
 /**
- * Little wrapper for struct wavpack_input to cast from void *.
+ * Little wrapper for struct WavpackInput to cast from void *.
  */
-static struct wavpack_input *
+static WavpackInput *
 wpin(void *id)
 {
 	assert(id);
-	return (struct wavpack_input *)id;
+	return (WavpackInput *)id;
 }
 
 static int32_t
 wavpack_input_read_bytes(void *id, void *data, int32_t bcount)
 {
+	return wpin(id)->ReadBytes(data, bcount);
+}
+
+int32_t
+WavpackInput::ReadBytes(void *data, size_t bcount)
+{
 	uint8_t *buf = (uint8_t *)data;
 	int32_t i = 0;
 
-	if (wpin(id)->last_byte != EOF) {
-		*buf++ = wpin(id)->last_byte;
-		wpin(id)->last_byte = EOF;
+	if (last_byte != EOF) {
+		*buf++ = last_byte;
+		last_byte = EOF;
 		--bcount;
 		++i;
 	}
@@ -356,9 +370,7 @@ wavpack_input_read_bytes(void *id, void *data, int32_t bcount)
 	/* wavpack fails if we return a partial read, so we just wait
 	   until the buffer is full */
 	while (bcount > 0) {
-		size_t nbytes = decoder_read(
-			wpin(id)->decoder, *wpin(id)->is, buf, bcount
-		);
+		size_t nbytes = decoder_read(&decoder, is, buf, bcount);
 		if (nbytes == 0) {
 			/* EOF, error or a decoder command */
 			break;
@@ -375,26 +387,55 @@ wavpack_input_read_bytes(void *id, void *data, int32_t bcount)
 static uint32_t
 wavpack_input_get_pos(void *id)
 {
-	return wpin(id)->is->offset;
+	WavpackInput &wpi = *wpin(id);
+
+	return wpi.is.GetOffset();
 }
 
 static int
 wavpack_input_set_pos_abs(void *id, uint32_t pos)
 {
-	return wpin(id)->is->LockSeek(pos, SEEK_SET, IgnoreError()) ? 0 : -1;
+	WavpackInput &wpi = *wpin(id);
+
+	return wpi.is.LockSeek(pos, IgnoreError()) ? 0 : -1;
 }
 
 static int
 wavpack_input_set_pos_rel(void *id, int32_t delta, int mode)
 {
-	return wpin(id)->is->LockSeek(delta, mode, IgnoreError()) ? 0 : -1;
+	WavpackInput &wpi = *wpin(id);
+	InputStream &is = wpi.is;
+
+	offset_type offset = delta;
+	switch (mode) {
+	case SEEK_SET:
+		break;
+
+	case SEEK_CUR:
+		offset += is.GetOffset();
+		break;
+
+	case SEEK_END:
+		if (!is.KnownSize())
+			return -1;
+
+		offset += is.GetSize();
+		break;
+
+	default:
+		return -1;
+	}
+
+	return is.LockSeek(offset, IgnoreError()) ? 0 : -1;
 }
 
 static int
 wavpack_input_push_back_byte(void *id, int c)
 {
-	if (wpin(id)->last_byte == EOF) {
-		wpin(id)->last_byte = c;
+	WavpackInput &wpi = *wpin(id);
+
+	if (wpi.last_byte == EOF) {
+		wpi.last_byte = c;
 		return c;
 	} else {
 		return EOF;
@@ -404,16 +445,22 @@ wavpack_input_push_back_byte(void *id, int c)
 static uint32_t
 wavpack_input_get_length(void *id)
 {
-	if (wpin(id)->is->size < 0)
+	WavpackInput &wpi = *wpin(id);
+	InputStream &is = wpi.is;
+
+	if (!is.KnownSize())
 		return 0;
 
-	return wpin(id)->is->size;
+	return is.GetSize();
 }
 
 static int
 wavpack_input_can_seek(void *id)
 {
-	return wpin(id)->is->seekable;
+	WavpackInput &wpi = *wpin(id);
+	InputStream &is = wpi.is;
+
+	return is.IsSeekable();
 }
 
 static WavpackStreamReader mpd_is_reader = {
@@ -427,19 +474,8 @@ static WavpackStreamReader mpd_is_reader = {
 	nullptr /* no need to write edited tags */
 };
 
-static void
-wavpack_input_init(struct wavpack_input *isp, Decoder &decoder,
-		   InputStream &is)
-{
-	isp->decoder = &decoder;
-	isp->is = &is;
-	isp->last_byte = EOF;
-}
-
-static InputStream *
-wavpack_open_wvc(Decoder &decoder, const char *uri,
-		 Mutex &mutex, Cond &cond,
-		 struct wavpack_input *wpi)
+static WavpackInput *
+wavpack_open_wvc(Decoder &decoder, const char *uri)
 {
 	/*
 	 * As we use dc->utf8url, this function will be bad for
@@ -450,29 +486,13 @@ wavpack_open_wvc(Decoder &decoder, const char *uri,
 
 	char *wvc_url = g_strconcat(uri, "c", nullptr);
 
-	InputStream *is_wvc = InputStream::Open(wvc_url, mutex, cond,
-						IgnoreError());
+	InputStream *is_wvc = decoder_open_uri(decoder, uri, IgnoreError());
 	g_free(wvc_url);
 
 	if (is_wvc == nullptr)
 		return nullptr;
 
-	/*
-	 * And we try to buffer in order to get know
-	 * about a possible 404 error.
-	 */
-	char first_byte;
-	size_t nbytes = decoder_read(decoder, *is_wvc,
-				     &first_byte, sizeof(first_byte));
-	if (nbytes == 0) {
-		is_wvc->Close();
-		return nullptr;
-	}
-
-	/* push it back */
-	wavpack_input_init(wpi, decoder, *is_wvc);
-	wpi->last_byte = first_byte;
-	return is_wvc;
+	return new WavpackInput(decoder, *is_wvc);
 }
 
 /*
@@ -482,29 +502,23 @@ static void
 wavpack_streamdecode(Decoder &decoder, InputStream &is)
 {
 	int open_flags = OPEN_NORMALIZE;
-	bool can_seek = is.seekable;
+	bool can_seek = is.IsSeekable();
 
-	wavpack_input isp_wvc;
-	InputStream *is_wvc = wavpack_open_wvc(decoder, is.uri.c_str(),
-					       is.mutex, is.cond,
-					       &isp_wvc);
-	if (is_wvc != nullptr) {
+	WavpackInput *wvc = wavpack_open_wvc(decoder, is.GetURI());
+	if (wvc != nullptr) {
 		open_flags |= OPEN_WVC;
-		can_seek &= is_wvc->seekable;
+		can_seek &= wvc->is.IsSeekable();
 	}
 
 	if (!can_seek) {
 		open_flags |= OPEN_STREAMING;
 	}
 
-	wavpack_input isp;
-	wavpack_input_init(&isp, decoder, is);
+	WavpackInput isp(decoder, is);
 
 	char error[ERRORLEN];
 	WavpackContext *wpc =
-		WavpackOpenFileInputEx(&mpd_is_reader, &isp,
-				       open_flags & OPEN_WVC
-				       ? &isp_wvc : nullptr,
+		WavpackOpenFileInputEx(&mpd_is_reader, &isp, wvc,
 				       error, open_flags, 23);
 
 	if (wpc == nullptr) {
@@ -516,8 +530,10 @@ wavpack_streamdecode(Decoder &decoder, InputStream &is)
 	wavpack_decode(decoder, wpc, can_seek);
 
 	WavpackCloseFile(wpc);
-	if (open_flags & OPEN_WVC) {
-		is_wvc->Close();
+
+	if (wvc != nullptr) {
+		delete &wvc->is;
+		delete wvc;
 	}
 }
 
@@ -525,16 +541,16 @@ wavpack_streamdecode(Decoder &decoder, InputStream &is)
  * Decodes a file.
  */
 static void
-wavpack_filedecode(Decoder &decoder, const char *fname)
+wavpack_filedecode(Decoder &decoder, Path path_fs)
 {
 	char error[ERRORLEN];
-	WavpackContext *wpc = WavpackOpenFileInput(fname, error,
+	WavpackContext *wpc = WavpackOpenFileInput(path_fs.c_str(), error,
 						   OPEN_TAGS | OPEN_WVC | OPEN_NORMALIZE,
 						   23);
 	if (wpc == nullptr) {
 		FormatWarning(wavpack_domain,
 			      "failed to open WavPack file \"%s\": %s",
-			      fname, error);
+			      path_fs.c_str(), error);
 		return;
 	}
 
diff --git a/src/decoder/WavpackDecoderPlugin.hxx b/src/decoder/plugins/WavpackDecoderPlugin.hxx
index 3a2d94532..2e5f9bd42 100644
--- a/src/decoder/WavpackDecoderPlugin.hxx
+++ b/src/decoder/plugins/WavpackDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/WildmidiDecoderPlugin.cxx b/src/decoder/plugins/WildmidiDecoderPlugin.cxx
index 3da3f1387..fc58f0977 100644
--- a/src/decoder/WildmidiDecoderPlugin.cxx
+++ b/src/decoder/plugins/WildmidiDecoderPlugin.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,12 +19,13 @@
 
 #include "config.h"
 #include "WildmidiDecoderPlugin.hxx"
-#include "DecoderAPI.hxx"
+#include "../DecoderAPI.hxx"
 #include "tag/TagHandler.hxx"
 #include "util/Error.hxx"
 #include "util/Domain.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "fs/FileSystem.hxx"
+#include "fs/Path.hxx"
 #include "system/FatalError.hxx"
 #include "Log.hxx"
 
@@ -65,7 +66,7 @@ wildmidi_finish(void)
 }
 
 static void
-wildmidi_file_decode(Decoder &decoder, const char *path_fs)
+wildmidi_file_decode(Decoder &decoder, Path path_fs)
 {
 	static constexpr AudioFormat audio_format = {
 		WILDMIDI_SAMPLE_RATE,
@@ -75,7 +76,7 @@ wildmidi_file_decode(Decoder &decoder, const char *path_fs)
 	midi *wm;
 	const struct _WM_Info *info;
 
-	wm = WildMidi_Open(path_fs);
+	wm = WildMidi_Open(path_fs.c_str());
 	if (wm == nullptr)
 		return;
 
@@ -85,8 +86,11 @@ wildmidi_file_decode(Decoder &decoder, const char *path_fs)
 		return;
 	}
 
-	decoder_initialized(decoder, audio_format, true,
-			    info->approx_total_samples / WILDMIDI_SAMPLE_RATE);
+	const auto duration =
+		SongTime::FromScale<uint64_t>(info->approx_total_samples,
+					      WILDMIDI_SAMPLE_RATE);
+
+	decoder_initialized(decoder, audio_format, true, duration);
 
 	DecoderCommand cmd;
 	do {
@@ -104,8 +108,8 @@ wildmidi_file_decode(Decoder &decoder, const char *path_fs)
 		cmd = decoder_data(decoder, nullptr, buffer, len, 0);
 
 		if (cmd == DecoderCommand::SEEK) {
-			unsigned long seek_where = WILDMIDI_SAMPLE_RATE *
-				decoder_seek_where(decoder);
+			unsigned long seek_where =
+				decoder_seek_where_frame(decoder);
 
 			WildMidi_FastSeek(wm, &seek_where);
 			decoder_command_finished(decoder);
@@ -118,10 +122,10 @@ wildmidi_file_decode(Decoder &decoder, const char *path_fs)
 }
 
 static bool
-wildmidi_scan_file(const char *path_fs,
+wildmidi_scan_file(Path path_fs,
 		   const struct tag_handler *handler, void *handler_ctx)
 {
-	midi *wm = WildMidi_Open(path_fs);
+	midi *wm = WildMidi_Open(path_fs.c_str());
 	if (wm == nullptr)
 		return false;
 
@@ -131,7 +135,9 @@ wildmidi_scan_file(const char *path_fs,
 		return false;
 	}
 
-	int duration = info->approx_total_samples / WILDMIDI_SAMPLE_RATE;
+	const auto duration =
+		SongTime::FromScale<uint64_t>(info->approx_total_samples,
+					      WILDMIDI_SAMPLE_RATE);
 	tag_handler_invoke_duration(handler, handler_ctx, duration);
 
 	WildMidi_Close(wm);
diff --git a/src/decoder/WildmidiDecoderPlugin.hxx b/src/decoder/plugins/WildmidiDecoderPlugin.hxx
index a6289612e..fc87aab80 100644
--- a/src/decoder/WildmidiDecoderPlugin.hxx
+++ b/src/decoder/plugins/WildmidiDecoderPlugin.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
diff --git a/src/decoder/XiphTags.cxx b/src/decoder/plugins/XiphTags.cxx
index b9958a19a..11a0bcd42 100644
--- a/src/decoder/XiphTags.cxx
+++ b/src/decoder/plugins/XiphTags.cxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -17,6 +17,10 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+/* This File contains additional Tags for Xiph-Based Formats like Ogg-Vorbis,
+ * Flac and Opus which will be used in addition to the Tags in tag/TagNames.c
+ * see https://www.xiph.org/vorbis/doc/v-comment.html for further Info
+ */
 #include "config.h"
 #include "XiphTags.hxx"
 
@@ -24,5 +28,6 @@ const struct tag_table xiph_tags[] = {
 	{ "tracknumber", TAG_TRACK },
 	{ "discnumber", TAG_DISC },
 	{ "album artist", TAG_ALBUM_ARTIST },
+	{ "description", TAG_COMMENT },
 	{ nullptr, TAG_NUM_OF_ITEM_TYPES }
 };
diff --git a/src/decoder/XiphTags.hxx b/src/decoder/plugins/XiphTags.hxx
index 606dfef10..48a27425f 100644
--- a/src/decoder/XiphTags.hxx
+++ b/src/decoder/plugins/XiphTags.hxx
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify