1 files changed, 509 insertions, 0 deletions
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);
+}