1 files changed, 501 insertions, 0 deletions
diff --git a/src/DecoderThread.cxx b/src/DecoderThread.cxx
new file mode 100644
index 000000000..5d7bf3e5f
--- /dev/null
+++ b/src/DecoderThread.cxx
@@ -0,0 +1,501 @@
+/*
+ * Copyright (C) 2003-2013 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 "Song.hxx"
+#include "system/FatalError.hxx"
+#include "Mapper.hxx"
+#include "fs/Path.hxx"
+#include "DecoderAPI.hxx"
+#include "tag/Tag.hxx"
+#include "InputStream.hxx"
+#include "DecoderList.hxx"
+#include "util/UriUtil.hxx"
+#include "util/Error.hxx"
+#include "tag/ApeReplayGain.hxx"
+
+#include <glib.h>
+
+#include <unistd.h>
+#include <stdio.h> /* for SEEK_SET */
+
+#undef G_LOG_DOMAIN
+#define G_LOG_DOMAIN "decoder_thread"
+
+/**
+ * Marks the current decoder command as "finished" and notifies the
+ * player thread.
+ *
+ * @param dc the #decoder_control object; must be locked
+ */
+static void
+decoder_command_finished_locked(struct decoder_control *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, NULL on error
+ */
+static struct input_stream *
+decoder_input_stream_open(struct decoder_control *dc, const char *uri)
+{
+	Error error;
+
+	input_stream *is = input_stream::Open(uri, dc->mutex, dc->cond, error);
+	if (is == NULL) {
+		if (error.IsDefined())
+			g_warning("%s", error.GetMessage());
+
+		return NULL;
+	}
+
+	/* wait for the input stream to become ready; its metadata
+	   will be available then */
+
+	dc->Lock();
+
+	is->Update();
+	while (!is->ready &&
+	       dc->command != DecoderCommand::STOP) {
+		dc->Wait();
+
+		is->Update();
+	}
+
+	if (!is->Check(error)) {
+		dc->Unlock();
+
+		g_warning("%s", error.GetMessage());
+		return NULL;
+	}
+
+	dc->Unlock();
+
+	return is;
+}
+
+static bool
+decoder_stream_decode(const struct decoder_plugin *plugin,
+		      struct decoder *decoder,
+		      struct input_stream *input_stream)
+{
+	assert(plugin != NULL);
+	assert(plugin->stream_decode != NULL);
+	assert(decoder != NULL);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
+	assert(input_stream != NULL);
+	assert(input_stream->ready);
+	assert(decoder->dc->state == DecoderState::START);
+
+	g_debug("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->Seek(0, SEEK_SET, IgnoreError());
+
+	decoder->dc->Unlock();
+
+	decoder_plugin_stream_decode(plugin, decoder, input_stream);
+
+	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 struct decoder_plugin *plugin,
+		    struct decoder *decoder, const char *path)
+{
+	assert(plugin != NULL);
+	assert(plugin->file_decode != NULL);
+	assert(decoder != NULL);
+	assert(decoder->stream_tag == NULL);
+	assert(decoder->decoder_tag == NULL);
+	assert(path != NULL);
+	assert(g_path_is_absolute(path));
+	assert(decoder->dc->state == DecoderState::START);
+
+	g_debug("probing plugin %s", plugin->name);
+
+	if (decoder->dc->command == DecoderCommand::STOP)
+		return true;
+
+	decoder->dc->Unlock();
+
+	decoder_plugin_file_decode(plugin, decoder, path);
+
+	decoder->dc->Lock();
+
+	assert(decoder->dc->state == DecoderState::START ||
+	       decoder->dc->state == DecoderState::DECODE);
+
+	return decoder->dc->state != DecoderState::START;
+}
+
+/**
+ * Hack to allow tracking const decoder plugins in a GSList.
+ */
+static inline gpointer
+deconst_plugin(const struct decoder_plugin *plugin)
+{
+	return const_cast<struct decoder_plugin *>(plugin);
+}
+
+/**
+ * Try decoding a stream, using plugins matching the stream's MIME type.
+ *
+ * @param tried_r a list of plugins which were tried
+ */
+static bool
+decoder_run_stream_mime_type(struct decoder *decoder, struct input_stream *is,
+			     GSList **tried_r)
+{
+	assert(tried_r != NULL);
+
+	const struct decoder_plugin *plugin;
+	unsigned int next = 0;
+
+	if (is->mime.empty())
+		return false;
+
+	while ((plugin = decoder_plugin_from_mime_type(is->mime.c_str(),
+						       next++))) {
+		if (plugin->stream_decode == NULL)
+			continue;
+
+		if (g_slist_find(*tried_r, plugin) != NULL)
+			/* don't try a plugin twice */
+			continue;
+
+		if (decoder_stream_decode(plugin, decoder, is))
+			return true;
+
+		*tried_r = g_slist_prepend(*tried_r, deconst_plugin(plugin));
+	}
+
+	return false;
+}
+
+/**
+ * Try decoding a stream, using plugins matching the stream's URI
+ * suffix.
+ *
+ * @param tried_r a list of plugins which were tried
+ */
+static bool
+decoder_run_stream_suffix(struct decoder *decoder, struct input_stream *is,
+			  const char *uri, GSList **tried_r)
+{
+	assert(tried_r != NULL);
+
+	const char *suffix = uri_get_suffix(uri);
+	const struct decoder_plugin *plugin = NULL;
+
+	if (suffix == NULL)
+		return false;
+
+	while ((plugin = decoder_plugin_from_suffix(suffix, plugin)) != NULL) {
+		if (plugin->stream_decode == NULL)
+			continue;
+
+		if (g_slist_find(*tried_r, plugin) != NULL)
+			/* don't try a plugin twice */
+			continue;
+
+		if (decoder_stream_decode(plugin, decoder, is))
+			return true;
+
+		*tried_r = g_slist_prepend(*tried_r, deconst_plugin(plugin));
+	}
+
+	return false;
+}
+
+/**
+ * Try decoding a stream, using the fallback plugin.
+ */
+static bool
+decoder_run_stream_fallback(struct decoder *decoder, struct input_stream *is)
+{
+	const struct decoder_plugin *plugin;
+
+	plugin = decoder_plugin_from_name("mad");
+	return plugin != NULL && plugin->stream_decode != NULL &&
+		decoder_stream_decode(plugin, decoder, is);
+}
+
+/**
+ * Try decoding a stream.
+ */
+static bool
+decoder_run_stream(struct decoder *decoder, const char *uri)
+{
+	struct decoder_control *dc = decoder->dc;
+	struct input_stream *input_stream;
+	bool success;
+
+	dc->Unlock();
+
+	input_stream = decoder_input_stream_open(dc, uri);
+	if (input_stream == NULL) {
+		dc->Lock();
+		return false;
+	}
+
+	dc->Lock();
+
+	GSList *tried = NULL;
+
+	success = dc->command == DecoderCommand::STOP ||
+		/* first we try mime types: */
+		decoder_run_stream_mime_type(decoder, input_stream, &tried) ||
+		/* if that fails, try suffix matching the URL: */
+		decoder_run_stream_suffix(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 == NULL &&
+		 decoder_run_stream_fallback(decoder, input_stream));
+
+	g_slist_free(tried);
+
+	dc->Unlock();
+	input_stream->Close();
+	dc->Lock();
+
+	return success;
+}
+
+/**
+ * Attempt to load replay gain data, and pass it to
+ * decoder_replay_gain().
+ */
+static void
+decoder_load_replay_gain(struct decoder *decoder, const char *path_fs)
+{
+	struct replay_gain_info info;
+	if (replay_gain_ape_read(path_fs, &info))
+		decoder_replay_gain(decoder, &info);
+}
+
+/**
+ * Try decoding a file.
+ */
+static bool
+decoder_run_file(struct decoder *decoder, const char *path_fs)
+{
+	struct decoder_control *dc = decoder->dc;
+	const char *suffix = uri_get_suffix(path_fs);
+	const struct decoder_plugin *plugin = NULL;
+
+	if (suffix == NULL)
+		return false;
+
+	dc->Unlock();
+
+	decoder_load_replay_gain(decoder, path_fs);
+
+	while ((plugin = decoder_plugin_from_suffix(suffix, plugin)) != NULL) {
+		if (plugin->file_decode != NULL) {
+			dc->Lock();
+
+			if (decoder_file_decode(plugin, decoder, path_fs))
+				return true;
+
+			dc->Unlock();
+		} else if (plugin->stream_decode != NULL) {
+			struct input_stream *input_stream;
+			bool success;
+
+			input_stream = decoder_input_stream_open(dc, path_fs);
+			if (input_stream == NULL)
+				continue;
+
+			dc->Lock();
+
+			success = decoder_stream_decode(plugin, decoder,
+							input_stream);
+
+			dc->Unlock();
+
+			input_stream->Close();
+
+			if (success) {
+				dc->Lock();
+				return true;
+			}
+		}
+	}
+
+	dc->Lock();
+	return false;
+}
+
+static void
+decoder_run_song(struct decoder_control *dc,
+		 const Song *song, const char *uri)
+{
+	decoder decoder(dc, dc->start_ms > 0,
+			song->tag != NULL && song->IsFile()
+			? new Tag(*song->tag) : nullptr);
+	int ret;
+
+	dc->state = DecoderState::START;
+
+	decoder_command_finished_locked(dc);
+
+	ret = song->IsFile()
+		? decoder_run_file(&decoder, uri)
+		: decoder_run_stream(&decoder, uri);
+
+	dc->Unlock();
+
+	/* flush the last chunk */
+
+	if (decoder.chunk != NULL)
+		decoder_flush_chunk(&decoder);
+
+	dc->Lock();
+
+	if (ret)
+		dc->state = DecoderState::STOP;
+	else {
+		dc->state = DecoderState::ERROR;
+
+		const char *error_uri = song->uri;
+		char *allocated = uri_remove_auth(error_uri);
+		if (allocated != NULL)
+			error_uri = allocated;
+
+		dc->error.Format(decoder_domain,
+				 "Failed to decode %s", error_uri);
+		g_free(allocated);
+	}
+
+	dc->client_cond.signal();
+}
+
+static void
+decoder_run(struct decoder_control *dc)
+{
+	dc->ClearError();
+
+	const Song *song = dc->song;
+	char *uri;
+
+	assert(song != NULL);
+
+	if (song->IsFile())
+		uri = map_song_fs(song).Steal();
+	else
+		uri = song->GetURI();
+
+	if (uri == NULL) {
+		dc->state = DecoderState::ERROR;
+		dc->error.Set(decoder_domain, "Failed to map song");
+
+		decoder_command_finished_locked(dc);
+		return;
+	}
+
+	decoder_run_song(dc, song, uri);
+	g_free(uri);
+
+}
+
+static gpointer
+decoder_task(gpointer arg)
+{
+	struct decoder_control *dc = (struct decoder_control *)arg;
+
+	dc->Lock();
+
+	do {
+		assert(dc->state == DecoderState::STOP ||
+		       dc->state == DecoderState::ERROR);
+
+		switch (dc->command) {
+		case DecoderCommand::START:
+			dc->MixRampStart(nullptr);
+			dc->MixRampPrevEnd(dc->mixramp_end);
+			dc->mixramp_end = NULL; /* Don't free, it's copied above. */
+			dc->replay_gain_prev_db = dc->replay_gain_db;
+			dc->replay_gain_db = 0;
+
+                        /* fall through */
+
+		case DecoderCommand::SEEK:
+			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();
+
+	return NULL;
+}
+
+void
+decoder_thread_start(struct decoder_control *dc)
+{
+	assert(dc->thread == NULL);
+
+	dc->quit = false;
+
+#if GLIB_CHECK_VERSION(2,32,0)
+	dc->thread = g_thread_new("thread", decoder_task, dc);
+#else
+	GError *e = NULL;
+	dc->thread = g_thread_create(decoder_task, dc, true, &e);
+	if (dc->thread == NULL)
+		FatalError("Failed to spawn decoder task", e);
+#endif
+}