{decoder,player}_thread: convert to C++

1 files changed, 521 insertions, 0 deletions

diff --git a/src/DecoderThread.cxx b/src/DecoderThread.cxx
new file mode 100644
index 000000000..e5b582598
--- /dev/null
+++ b/src/DecoderThread.cxx
@@ -0,0 +1,521 @@
+/*
+ * 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 "decoder_error.h"
+#include "decoder_plugin.h"
+#include "song.h"
+#include "mpd_error.h"
+
+extern "C" {
+#include "decoder_control.h"
+#include "decoder_internal.h"
+#include "decoder_list.h"
+#include "decoder_api.h"
+#include "replay_gain_ape.h"
+#include "input_stream.h"
+#include "tag.h"
+#include "mapper.h"
+#include "uri.h"
+}
+
+#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 != DECODE_COMMAND_NONE);
+
+	dc->command = DECODE_COMMAND_NONE;
+
+	g_cond_signal(dc->client_cond);
+}
+
+/**
+ * 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 #DECODE_COMMAND_STOP is
+ * received, NULL on error
+ */
+static struct input_stream *
+decoder_input_stream_open(struct decoder_control *dc, const char *uri)
+{
+	GError *error = NULL;
+	struct input_stream *is;
+
+	is = input_stream_open(uri, dc->mutex, dc->cond, &error);
+	if (is == NULL) {
+		if (error != NULL) {
+			g_warning("%s", error->message);
+			g_error_free(error);
+		}
+
+		return NULL;
+	}
+
+	/* wait for the input stream to become ready; its metadata
+	   will be available then */
+
+	decoder_lock(dc);
+
+	input_stream_update(is);
+	while (!is->ready &&
+	       dc->command != DECODE_COMMAND_STOP) {
+		decoder_wait(dc);
+
+		input_stream_update(is);
+	}
+
+	if (!input_stream_check(is, &error)) {
+		decoder_unlock(dc);
+
+		g_warning("%s", error->message);
+		g_error_free(error);
+
+		return NULL;
+	}
+
+	decoder_unlock(dc);
+
+	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 == DECODE_STATE_START);
+
+	g_debug("probing plugin %s", plugin->name);
+
+	if (decoder->dc->command == DECODE_COMMAND_STOP)
+		return true;
+
+	/* rewind the stream, so each plugin gets a fresh start */
+	input_stream_seek(input_stream, 0, SEEK_SET, NULL);
+
+	decoder_unlock(decoder->dc);
+
+	decoder_plugin_stream_decode(plugin, decoder, input_stream);
+
+	decoder_lock(decoder->dc);
+
+	assert(decoder->dc->state == DECODE_STATE_START ||
+	       decoder->dc->state == DECODE_STATE_DECODE);
+
+	return decoder->dc->state != DECODE_STATE_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 == DECODE_STATE_START);
+
+	g_debug("probing plugin %s", plugin->name);
+
+	if (decoder->dc->command == DECODE_COMMAND_STOP)
+		return true;
+
+	decoder_unlock(decoder->dc);
+
+	decoder_plugin_file_decode(plugin, decoder, path);
+
+	decoder_lock(decoder->dc);
+
+	assert(decoder->dc->state == DECODE_STATE_START ||
+	       decoder->dc->state == DECODE_STATE_DECODE);
+
+	return decoder->dc->state != DECODE_STATE_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 == NULL)
+		return false;
+
+	while ((plugin = decoder_plugin_from_mime_type(is->mime, 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;
+
+	decoder_unlock(dc);
+
+	input_stream = decoder_input_stream_open(dc, uri);
+	if (input_stream == NULL) {
+		decoder_lock(dc);
+		return false;
+	}
+
+	decoder_lock(dc);
+
+	GSList *tried = NULL;
+
+	success = dc->command == DECODE_COMMAND_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);
+
+	decoder_unlock(dc);
+	input_stream_close(input_stream);
+	decoder_lock(dc);
+
+	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;
+
+	decoder_unlock(dc);
+
+	decoder_load_replay_gain(decoder, path_fs);
+
+	while ((plugin = decoder_plugin_from_suffix(suffix, plugin)) != NULL) {
+		if (plugin->file_decode != NULL) {
+			decoder_lock(dc);
+
+			if (decoder_file_decode(plugin, decoder, path_fs))
+				return true;
+
+			decoder_unlock(dc);
+		} 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;
+
+			decoder_lock(dc);
+
+			success = decoder_stream_decode(plugin, decoder,
+							input_stream);
+
+			decoder_unlock(dc);
+
+			input_stream_close(input_stream);
+
+			if (success) {
+				decoder_lock(dc);
+				return true;
+			}
+		}
+	}
+
+	decoder_lock(dc);
+	return false;
+}
+
+static void
+decoder_run_song(struct decoder_control *dc,
+		 const struct song *song, const char *uri)
+{
+	decoder decoder(dc, dc->start_ms > 0);
+	int ret;
+
+	decoder.timestamp = 0.0;
+	decoder.seeking = false;
+	decoder.song_tag = song->tag != NULL && song_is_file(song)
+		? tag_dup(song->tag) : NULL;
+	decoder.stream_tag = NULL;
+	decoder.decoder_tag = NULL;
+	decoder.chunk = NULL;
+
+	dc->state = DECODE_STATE_START;
+
+	decoder_command_finished_locked(dc);
+
+	pcm_convert_init(&decoder.conv_state);
+
+	ret = song_is_file(song)
+		? decoder_run_file(&decoder, uri)
+		: decoder_run_stream(&decoder, uri);
+
+	decoder_unlock(dc);
+
+	pcm_convert_deinit(&decoder.conv_state);
+
+	/* flush the last chunk */
+
+	if (decoder.chunk != NULL)
+		decoder_flush_chunk(&decoder);
+
+	if (decoder.song_tag != NULL)
+		tag_free(decoder.song_tag);
+
+	if (decoder.stream_tag != NULL)
+		tag_free(decoder.stream_tag);
+
+	if (decoder.decoder_tag != NULL)
+		tag_free(decoder.decoder_tag);
+
+	decoder_lock(dc);
+
+	if (ret)
+		dc->state = DECODE_STATE_STOP;
+	else {
+		dc->state = DECODE_STATE_ERROR;
+
+		const char *error_uri = song->uri;
+		char *allocated = uri_remove_auth(error_uri);
+		if (allocated != NULL)
+			error_uri = allocated;
+
+		dc->error = g_error_new(decoder_quark(), 0,
+					"Failed to decode %s", error_uri);
+		g_free(allocated);
+	}
+}
+
+static void
+decoder_run(struct decoder_control *dc)
+{
+	dc_clear_error(dc);
+
+	const struct song *song = dc->song;
+	char *uri;
+
+	assert(song != NULL);
+
+	if (song_is_file(song))
+		uri = map_song_fs(song);
+	else
+		uri = song_get_uri(song);
+
+	if (uri == NULL) {
+		dc->state = DECODE_STATE_ERROR;
+		dc->error = g_error_new(decoder_quark(), 0,
+					"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;
+
+	decoder_lock(dc);
+
+	do {
+		assert(dc->state == DECODE_STATE_STOP ||
+		       dc->state == DECODE_STATE_ERROR);
+
+		switch (dc->command) {
+		case DECODE_COMMAND_START:
+			dc_mixramp_start(dc, NULL);
+			dc_mixramp_prev_end(dc, 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 DECODE_COMMAND_SEEK:
+			decoder_run(dc);
+			break;
+
+		case DECODE_COMMAND_STOP:
+			decoder_command_finished_locked(dc);
+			break;
+
+		case DECODE_COMMAND_NONE:
+			decoder_wait(dc);
+			break;
+		}
+	} while (dc->command != DECODE_COMMAND_NONE || !dc->quit);
+
+	decoder_unlock(dc);
+
+	return NULL;
+}
+
+void
+decoder_thread_start(struct decoder_control *dc)
+{
+	GError *e = NULL;
+
+	assert(dc->thread == NULL);
+
+	dc->quit = false;
+
+	dc->thread = g_thread_create(decoder_task, dc, true, &e);
+	if (dc->thread == NULL)
+		MPD_ERROR("Failed to spawn decoder task: %s", e->message);
+}