1 files changed, 690 insertions, 0 deletions

diff --git a/src/output/OutputThread.cxx b/src/output/OutputThread.cxx
new file mode 100644
index 000000000..f7e28b5f4
--- /dev/null
+++ b/src/output/OutputThread.cxx
@@ -0,0 +1,690 @@
+/*
+ * 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 "OutputThread.hxx"
+#include "OutputInternal.hxx"
+#include "OutputAPI.hxx"
+#include "OutputError.hxx"
+#include "pcm/PcmMix.hxx"
+#include "notify.hxx"
+#include "FilterInternal.hxx"
+#include "filter/ConvertFilterPlugin.hxx"
+#include "filter/ReplayGainFilterPlugin.hxx"
+#include "PlayerControl.hxx"
+#include "MusicPipe.hxx"
+#include "MusicChunk.hxx"
+#include "thread/Util.hxx"
+#include "thread/Name.hxx"
+#include "system/FatalError.hxx"
+#include "util/Error.hxx"
+#include "Log.hxx"
+#include "Compiler.h"
+
+#include <assert.h>
+#include <string.h>
+
+static void ao_command_finished(struct audio_output *ao)
+{
+	assert(ao->command != AO_COMMAND_NONE);
+	ao->command = AO_COMMAND_NONE;
+
+	ao->mutex.unlock();
+	audio_output_client_notify.Signal();
+	ao->mutex.lock();
+}
+
+static bool
+ao_enable(struct audio_output *ao)
+{
+	Error error;
+	bool success;
+
+	if (ao->really_enabled)
+		return true;
+
+	ao->mutex.unlock();
+	success = ao_plugin_enable(ao, error);
+	ao->mutex.lock();
+	if (!success) {
+		FormatError(error,
+			    "Failed to enable \"%s\" [%s]",
+			    ao->name, ao->plugin->name);
+		return false;
+	}
+
+	ao->really_enabled = true;
+	return true;
+}
+
+static void
+ao_close(struct audio_output *ao, bool drain);
+
+static void
+ao_disable(struct audio_output *ao)
+{
+	if (ao->open)
+		ao_close(ao, false);
+
+	if (ao->really_enabled) {
+		ao->really_enabled = false;
+
+		ao->mutex.unlock();
+		ao_plugin_disable(ao);
+		ao->mutex.lock();
+	}
+}
+
+static AudioFormat
+ao_filter_open(struct audio_output *ao, AudioFormat &format,
+	       Error &error_r)
+{
+	assert(format.IsValid());
+
+	/* the replay_gain filter cannot fail here */
+	if (ao->replay_gain_filter != nullptr &&
+	    !ao->replay_gain_filter->Open(format, error_r).IsDefined())
+		return AudioFormat::Undefined();
+
+	if (ao->other_replay_gain_filter != nullptr &&
+	    !ao->other_replay_gain_filter->Open(format, error_r).IsDefined()) {
+		if (ao->replay_gain_filter != nullptr)
+			ao->replay_gain_filter->Close();
+		return AudioFormat::Undefined();
+	}
+
+	const AudioFormat af = ao->filter->Open(format, error_r);
+	if (!af.IsDefined()) {
+		if (ao->replay_gain_filter != nullptr)
+			ao->replay_gain_filter->Close();
+		if (ao->other_replay_gain_filter != nullptr)
+			ao->other_replay_gain_filter->Close();
+	}
+
+	return af;
+}
+
+static void
+ao_filter_close(struct audio_output *ao)
+{
+	if (ao->replay_gain_filter != nullptr)
+		ao->replay_gain_filter->Close();
+	if (ao->other_replay_gain_filter != nullptr)
+		ao->other_replay_gain_filter->Close();
+
+	ao->filter->Close();
+}
+
+static void
+ao_open(struct audio_output *ao)
+{
+	bool success;
+	Error error;
+	struct audio_format_string af_string;
+
+	assert(!ao->open);
+	assert(ao->pipe != nullptr);
+	assert(ao->chunk == nullptr);
+	assert(ao->in_audio_format.IsValid());
+
+	ao->fail_timer.Reset();
+
+	/* enable the device (just in case the last enable has failed) */
+
+	if (!ao_enable(ao))
+		/* still no luck */
+		return;
+
+	/* open the filter */
+
+	const AudioFormat filter_audio_format =
+		ao_filter_open(ao, ao->in_audio_format, error);
+	if (!filter_audio_format.IsDefined()) {
+		FormatError(error, "Failed to open filter for \"%s\" [%s]",
+			    ao->name, ao->plugin->name);
+
+		ao->fail_timer.Update();
+		return;
+	}
+
+	assert(filter_audio_format.IsValid());
+
+	ao->out_audio_format = filter_audio_format;
+	ao->out_audio_format.ApplyMask(ao->config_audio_format);
+
+	ao->mutex.unlock();
+	success = ao_plugin_open(ao, ao->out_audio_format, error);
+	ao->mutex.lock();
+
+	assert(!ao->open);
+
+	if (!success) {
+		FormatError(error, "Failed to open \"%s\" [%s]",
+			    ao->name, ao->plugin->name);
+
+		ao_filter_close(ao);
+		ao->fail_timer.Update();
+		return;
+	}
+
+	if (!convert_filter_set(ao->convert_filter, ao->out_audio_format,
+				error)) {
+		FormatError(error, "Failed to convert for \"%s\" [%s]",
+			    ao->name, ao->plugin->name);
+
+		ao_filter_close(ao);
+		ao->fail_timer.Update();
+		return;
+	}
+
+	ao->open = true;
+
+	FormatDebug(output_domain,
+		    "opened plugin=%s name=\"%s\" audio_format=%s",
+		    ao->plugin->name, ao->name,
+		    audio_format_to_string(ao->out_audio_format, &af_string));
+
+	if (ao->in_audio_format != ao->out_audio_format)
+		FormatDebug(output_domain, "converting from %s",
+			    audio_format_to_string(ao->in_audio_format,
+						   &af_string));
+}
+
+static void
+ao_close(struct audio_output *ao, bool drain)
+{
+	assert(ao->open);
+
+	ao->pipe = nullptr;
+
+	ao->chunk = nullptr;
+	ao->open = false;
+
+	ao->mutex.unlock();
+
+	if (drain)
+		ao_plugin_drain(ao);
+	else
+		ao_plugin_cancel(ao);
+
+	ao_plugin_close(ao);
+	ao_filter_close(ao);
+
+	ao->mutex.lock();
+
+	FormatDebug(output_domain, "closed plugin=%s name=\"%s\"",
+		    ao->plugin->name, ao->name);
+}
+
+static void
+ao_reopen_filter(struct audio_output *ao)
+{
+	Error error;
+
+	ao_filter_close(ao);
+	const AudioFormat filter_audio_format =
+		ao_filter_open(ao, ao->in_audio_format, error);
+	if (!filter_audio_format.IsDefined() ||
+	    !convert_filter_set(ao->convert_filter, ao->out_audio_format,
+				error)) {
+		FormatError(error,
+			    "Failed to open filter for \"%s\" [%s]",
+			    ao->name, ao->plugin->name);
+
+		/* this is a little code duplication fro ao_close(),
+		   but we cannot call this function because we must
+		   not call filter_close(ao->filter) again */
+
+		ao->pipe = nullptr;
+
+		ao->chunk = nullptr;
+		ao->open = false;
+		ao->fail_timer.Update();
+
+		ao->mutex.unlock();
+		ao_plugin_close(ao);
+		ao->mutex.lock();
+
+		return;
+	}
+}
+
+static void
+ao_reopen(struct audio_output *ao)
+{
+	if (!ao->config_audio_format.IsFullyDefined()) {
+		if (ao->open) {
+			const MusicPipe *mp = ao->pipe;
+			ao_close(ao, true);
+			ao->pipe = mp;
+		}
+
+		/* no audio format is configured: copy in->out, let
+		   the output's open() method determine the effective
+		   out_audio_format */
+		ao->out_audio_format = ao->in_audio_format;
+		ao->out_audio_format.ApplyMask(ao->config_audio_format);
+	}
+
+	if (ao->open)
+		/* the audio format has changed, and all filters have
+		   to be reconfigured */
+		ao_reopen_filter(ao);
+	else
+		ao_open(ao);
+}
+
+/**
+ * Wait until the output's delay reaches zero.
+ *
+ * @return true if playback should be continued, false if a command
+ * was issued
+ */
+static bool
+ao_wait(struct audio_output *ao)
+{
+	while (true) {
+		unsigned delay = ao_plugin_delay(ao);
+		if (delay == 0)
+			return true;
+
+		(void)ao->cond.timed_wait(ao->mutex, delay);
+
+		if (ao->command != AO_COMMAND_NONE)
+			return false;
+	}
+}
+
+static const void *
+ao_chunk_data(struct audio_output *ao, const struct music_chunk *chunk,
+	      Filter *replay_gain_filter,
+	      unsigned *replay_gain_serial_p,
+	      size_t *length_r)
+{
+	assert(chunk != nullptr);
+	assert(!chunk->IsEmpty());
+	assert(chunk->CheckFormat(ao->in_audio_format));
+
+	const void *data = chunk->data;
+	size_t length = chunk->length;
+
+	(void)ao;
+
+	assert(length % ao->in_audio_format.GetFrameSize() == 0);
+
+	if (length > 0 && replay_gain_filter != nullptr) {
+		if (chunk->replay_gain_serial != *replay_gain_serial_p) {
+			replay_gain_filter_set_info(replay_gain_filter,
+						    chunk->replay_gain_serial != 0
+						    ? &chunk->replay_gain_info
+						    : nullptr);
+			*replay_gain_serial_p = chunk->replay_gain_serial;
+		}
+
+		Error error;
+		data = replay_gain_filter->FilterPCM(data, length,
+						     &length, error);
+		if (data == nullptr) {
+			FormatError(error, "\"%s\" [%s] failed to filter",
+				    ao->name, ao->plugin->name);
+			return nullptr;
+		}
+	}
+
+	*length_r = length;
+	return data;
+}
+
+static const void *
+ao_filter_chunk(struct audio_output *ao, const struct music_chunk *chunk,
+		size_t *length_r)
+{
+	size_t length;
+	const void *data = ao_chunk_data(ao, chunk, ao->replay_gain_filter,
+					 &ao->replay_gain_serial, &length);
+	if (data == nullptr)
+		return nullptr;
+
+	if (length == 0) {
+		/* empty chunk, nothing to do */
+		*length_r = 0;
+		return data;
+	}
+
+	/* cross-fade */
+
+	if (chunk->other != nullptr) {
+		size_t other_length;
+		const void *other_data =
+			ao_chunk_data(ao, chunk->other,
+				      ao->other_replay_gain_filter,
+				      &ao->other_replay_gain_serial,
+				      &other_length);
+		if (other_data == nullptr)
+			return nullptr;
+
+		if (other_length == 0) {
+			*length_r = 0;
+			return data;
+		}
+
+		/* if the "other" chunk is longer, then that trailer
+		   is used as-is, without mixing; it is part of the
+		   "next" song being faded in, and if there's a rest,
+		   it means cross-fading ends here */
+
+		if (length > other_length)
+			length = other_length;
+
+		void *dest = ao->cross_fade_buffer.Get(other_length);
+		memcpy(dest, other_data, other_length);
+		if (!pcm_mix(ao->cross_fade_dither, dest, data, length,
+			     ao->in_audio_format.format,
+			     1.0 - chunk->mix_ratio)) {
+			FormatError(output_domain,
+				    "Cannot cross-fade format %s",
+				    sample_format_to_string(ao->in_audio_format.format));
+			return nullptr;
+		}
+
+		data = dest;
+		length = other_length;
+	}
+
+	/* apply filter chain */
+
+	Error error;
+	data = ao->filter->FilterPCM(data, length, &length, error);
+	if (data == nullptr) {
+		FormatError(error, "\"%s\" [%s] failed to filter",
+			    ao->name, ao->plugin->name);
+		return nullptr;
+	}
+
+	*length_r = length;
+	return data;
+}
+
+static bool
+ao_play_chunk(struct audio_output *ao, const struct music_chunk *chunk)
+{
+	assert(ao != nullptr);
+	assert(ao->filter != nullptr);
+
+	if (ao->tags && gcc_unlikely(chunk->tag != nullptr)) {
+		ao->mutex.unlock();
+		ao_plugin_send_tag(ao, chunk->tag);
+		ao->mutex.lock();
+	}
+
+	size_t size;
+#if GCC_CHECK_VERSION(4,7)
+	/* workaround -Wmaybe-uninitialized false positive */
+	size = 0;
+#endif
+	const char *data = (const char *)ao_filter_chunk(ao, chunk, &size);
+	if (data == nullptr) {
+		ao_close(ao, false);
+
+		/* don't automatically reopen this device for 10
+		   seconds */
+		ao->fail_timer.Update();
+		return false;
+	}
+
+	Error error;
+
+	while (size > 0 && ao->command == AO_COMMAND_NONE) {
+		size_t nbytes;
+
+		if (!ao_wait(ao))
+			break;
+
+		ao->mutex.unlock();
+		nbytes = ao_plugin_play(ao, data, size, error);
+		ao->mutex.lock();
+		if (nbytes == 0) {
+			/* play()==0 means failure */
+			FormatError(error, "\"%s\" [%s] failed to play",
+				    ao->name, ao->plugin->name);
+
+			ao_close(ao, false);
+
+			/* don't automatically reopen this device for
+			   10 seconds */
+			assert(!ao->fail_timer.IsDefined());
+			ao->fail_timer.Update();
+
+			return false;
+		}
+
+		assert(nbytes <= size);
+		assert(nbytes % ao->out_audio_format.GetFrameSize() == 0);
+
+		data += nbytes;
+		size -= nbytes;
+	}
+
+	return true;
+}
+
+static const struct music_chunk *
+ao_next_chunk(struct audio_output *ao)
+{
+	return ao->chunk != nullptr
+		/* continue the previous play() call */
+		? ao->chunk->next
+		/* get the first chunk from the pipe */
+		: ao->pipe->Peek();
+}
+
+/**
+ * Plays all remaining chunks, until the tail of the pipe has been
+ * reached (and no more chunks are queued), or until a command is
+ * received.
+ *
+ * @return true if at least one chunk has been available, false if the
+ * tail of the pipe was already reached
+ */
+static bool
+ao_play(struct audio_output *ao)
+{
+	bool success;
+	const struct music_chunk *chunk;
+
+	assert(ao->pipe != nullptr);
+
+	chunk = ao_next_chunk(ao);
+	if (chunk == nullptr)
+		/* no chunk available */
+		return false;
+
+	ao->chunk_finished = false;
+
+	assert(!ao->in_playback_loop);
+	ao->in_playback_loop = true;
+
+	while (chunk != nullptr && ao->command == AO_COMMAND_NONE) {
+		assert(!ao->chunk_finished);
+
+		ao->chunk = chunk;
+
+		success = ao_play_chunk(ao, chunk);
+		if (!success) {
+			assert(ao->chunk == nullptr);
+			break;
+		}
+
+		assert(ao->chunk == chunk);
+		chunk = chunk->next;
+	}
+
+	assert(ao->in_playback_loop);
+	ao->in_playback_loop = false;
+
+	ao->chunk_finished = true;
+
+	ao->mutex.unlock();
+	ao->player_control->LockSignal();
+	ao->mutex.lock();
+
+	return true;
+}
+
+static void ao_pause(struct audio_output *ao)
+{
+	bool ret;
+
+	ao->mutex.unlock();
+	ao_plugin_cancel(ao);
+	ao->mutex.lock();
+
+	ao->pause = true;
+	ao_command_finished(ao);
+
+	do {
+		if (!ao_wait(ao))
+			break;
+
+		ao->mutex.unlock();
+		ret = ao_plugin_pause(ao);
+		ao->mutex.lock();
+
+		if (!ret) {
+			ao_close(ao, false);
+			break;
+		}
+	} while (ao->command == AO_COMMAND_NONE);
+
+	ao->pause = false;
+}
+
+static void
+audio_output_task(void *arg)
+{
+	struct audio_output *ao = (struct audio_output *)arg;
+
+	FormatThreadName("output:%s", ao->name);
+
+	SetThreadRealtime();
+
+	ao->mutex.lock();
+
+	while (1) {
+		switch (ao->command) {
+		case AO_COMMAND_NONE:
+			break;
+
+		case AO_COMMAND_ENABLE:
+			ao_enable(ao);
+			ao_command_finished(ao);
+			break;
+
+		case AO_COMMAND_DISABLE:
+			ao_disable(ao);
+			ao_command_finished(ao);
+			break;
+
+		case AO_COMMAND_OPEN:
+			ao_open(ao);
+			ao_command_finished(ao);
+			break;
+
+		case AO_COMMAND_REOPEN:
+			ao_reopen(ao);
+			ao_command_finished(ao);
+			break;
+
+		case AO_COMMAND_CLOSE:
+			assert(ao->open);
+			assert(ao->pipe != nullptr);
+
+			ao_close(ao, false);
+			ao_command_finished(ao);
+			break;
+
+		case AO_COMMAND_PAUSE:
+			if (!ao->open) {
+				/* the output has failed after
+				   audio_output_all_pause() has
+				   submitted the PAUSE command; bail
+				   out */
+				ao_command_finished(ao);
+				break;
+			}
+
+			ao_pause(ao);
+			/* don't "break" here: this might cause
+			   ao_play() to be called when command==CLOSE
+			   ends the paused state - "continue" checks
+			   the new command first */
+			continue;
+
+		case AO_COMMAND_DRAIN:
+			if (ao->open) {
+				assert(ao->chunk == nullptr);
+				assert(ao->pipe->Peek() == nullptr);
+
+				ao->mutex.unlock();
+				ao_plugin_drain(ao);
+				ao->mutex.lock();
+			}
+
+			ao_command_finished(ao);
+			continue;
+
+		case AO_COMMAND_CANCEL:
+			ao->chunk = nullptr;
+
+			if (ao->open) {
+				ao->mutex.unlock();
+				ao_plugin_cancel(ao);
+				ao->mutex.lock();
+			}
+
+			ao_command_finished(ao);
+			continue;
+
+		case AO_COMMAND_KILL:
+			ao->chunk = nullptr;
+			ao_command_finished(ao);
+			ao->mutex.unlock();
+			return;
+		}
+
+		if (ao->open && ao->allow_play && ao_play(ao))
+			/* don't wait for an event if there are more
+			   chunks in the pipe */
+			continue;
+
+		if (ao->command == AO_COMMAND_NONE) {
+			ao->woken_for_play = false;
+			ao->cond.wait(ao->mutex);
+		}
+	}
+}
+
+void audio_output_thread_start(struct audio_output *ao)
+{
+	assert(ao->command == AO_COMMAND_NONE);
+
+	Error error;
+	if (!ao->thread.Start(audio_output_task, ao, error))
+		FatalError(error);
+}