{decoder,player}_thread: convert to C++
This commit is contained in:
Max Kellermann
521
src/DecoderThread.cxx
Normal file
521
src/DecoderThread.cxx
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@@ -0,0 +1,521 @@
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/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "DecoderThread.hxx"
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#include "decoder_error.h"
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#include "decoder_plugin.h"
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#include "song.h"
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#include "mpd_error.h"
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extern "C" {
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#include "decoder_control.h"
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#include "decoder_internal.h"
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#include "decoder_list.h"
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#include "decoder_api.h"
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#include "replay_gain_ape.h"
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#include "input_stream.h"
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#include "tag.h"
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#include "mapper.h"
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#include "uri.h"
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}
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#include <glib.h>
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#include <unistd.h>
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#include <stdio.h> /* for SEEK_SET */
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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "decoder_thread"
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/**
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* Marks the current decoder command as "finished" and notifies the
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* player thread.
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*
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* @param dc the #decoder_control object; must be locked
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*/
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static void
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decoder_command_finished_locked(struct decoder_control *dc)
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{
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assert(dc->command != DECODE_COMMAND_NONE);
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dc->command = DECODE_COMMAND_NONE;
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g_cond_signal(dc->client_cond);
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}
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/**
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* Opens the input stream with input_stream_open(), and waits until
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* the stream gets ready. If a decoder STOP command is received
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* during that, it cancels the operation (but does not close the
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* stream).
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*
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* Unlock the decoder before calling this function.
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*
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* @return an input_stream on success or if #DECODE_COMMAND_STOP is
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* received, NULL on error
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*/
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static struct input_stream *
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decoder_input_stream_open(struct decoder_control *dc, const char *uri)
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{
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GError *error = NULL;
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struct input_stream *is;
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is = input_stream_open(uri, dc->mutex, dc->cond, &error);
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if (is == NULL) {
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if (error != NULL) {
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g_warning("%s", error->message);
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g_error_free(error);
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}
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return NULL;
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}
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/* wait for the input stream to become ready; its metadata
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will be available then */
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decoder_lock(dc);
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input_stream_update(is);
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while (!is->ready &&
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dc->command != DECODE_COMMAND_STOP) {
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decoder_wait(dc);
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input_stream_update(is);
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}
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if (!input_stream_check(is, &error)) {
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decoder_unlock(dc);
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g_warning("%s", error->message);
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g_error_free(error);
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return NULL;
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}
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decoder_unlock(dc);
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return is;
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}
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static bool
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decoder_stream_decode(const struct decoder_plugin *plugin,
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struct decoder *decoder,
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struct input_stream *input_stream)
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{
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assert(plugin != NULL);
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assert(plugin->stream_decode != NULL);
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assert(decoder != NULL);
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assert(decoder->stream_tag == NULL);
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assert(decoder->decoder_tag == NULL);
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assert(input_stream != NULL);
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assert(input_stream->ready);
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assert(decoder->dc->state == DECODE_STATE_START);
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g_debug("probing plugin %s", plugin->name);
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if (decoder->dc->command == DECODE_COMMAND_STOP)
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return true;
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/* rewind the stream, so each plugin gets a fresh start */
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input_stream_seek(input_stream, 0, SEEK_SET, NULL);
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decoder_unlock(decoder->dc);
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decoder_plugin_stream_decode(plugin, decoder, input_stream);
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decoder_lock(decoder->dc);
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assert(decoder->dc->state == DECODE_STATE_START ||
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decoder->dc->state == DECODE_STATE_DECODE);
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return decoder->dc->state != DECODE_STATE_START;
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}
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static bool
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decoder_file_decode(const struct decoder_plugin *plugin,
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struct decoder *decoder, const char *path)
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{
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assert(plugin != NULL);
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assert(plugin->file_decode != NULL);
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assert(decoder != NULL);
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assert(decoder->stream_tag == NULL);
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assert(decoder->decoder_tag == NULL);
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assert(path != NULL);
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assert(g_path_is_absolute(path));
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assert(decoder->dc->state == DECODE_STATE_START);
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g_debug("probing plugin %s", plugin->name);
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if (decoder->dc->command == DECODE_COMMAND_STOP)
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return true;
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decoder_unlock(decoder->dc);
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decoder_plugin_file_decode(plugin, decoder, path);
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decoder_lock(decoder->dc);
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assert(decoder->dc->state == DECODE_STATE_START ||
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decoder->dc->state == DECODE_STATE_DECODE);
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return decoder->dc->state != DECODE_STATE_START;
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}
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/**
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* Hack to allow tracking const decoder plugins in a GSList.
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*/
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static inline gpointer
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deconst_plugin(const struct decoder_plugin *plugin)
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{
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return const_cast<struct decoder_plugin *>(plugin);
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}
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/**
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* Try decoding a stream, using plugins matching the stream's MIME type.
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*
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* @param tried_r a list of plugins which were tried
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*/
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static bool
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decoder_run_stream_mime_type(struct decoder *decoder, struct input_stream *is,
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GSList **tried_r)
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{
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assert(tried_r != NULL);
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const struct decoder_plugin *plugin;
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unsigned int next = 0;
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if (is->mime == NULL)
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return false;
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while ((plugin = decoder_plugin_from_mime_type(is->mime, next++))) {
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if (plugin->stream_decode == NULL)
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continue;
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if (g_slist_find(*tried_r, plugin) != NULL)
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/* don't try a plugin twice */
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continue;
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if (decoder_stream_decode(plugin, decoder, is))
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return true;
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*tried_r = g_slist_prepend(*tried_r, deconst_plugin(plugin));
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}
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return false;
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}
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/**
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* Try decoding a stream, using plugins matching the stream's URI
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* suffix.
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*
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* @param tried_r a list of plugins which were tried
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*/
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static bool
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decoder_run_stream_suffix(struct decoder *decoder, struct input_stream *is,
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const char *uri, GSList **tried_r)
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{
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assert(tried_r != NULL);
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const char *suffix = uri_get_suffix(uri);
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const struct decoder_plugin *plugin = NULL;
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if (suffix == NULL)
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return false;
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while ((plugin = decoder_plugin_from_suffix(suffix, plugin)) != NULL) {
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if (plugin->stream_decode == NULL)
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continue;
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if (g_slist_find(*tried_r, plugin) != NULL)
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/* don't try a plugin twice */
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continue;
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if (decoder_stream_decode(plugin, decoder, is))
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return true;
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*tried_r = g_slist_prepend(*tried_r, deconst_plugin(plugin));
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}
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return false;
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}
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/**
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* Try decoding a stream, using the fallback plugin.
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*/
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static bool
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decoder_run_stream_fallback(struct decoder *decoder, struct input_stream *is)
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{
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const struct decoder_plugin *plugin;
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plugin = decoder_plugin_from_name("mad");
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return plugin != NULL && plugin->stream_decode != NULL &&
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decoder_stream_decode(plugin, decoder, is);
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}
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/**
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* Try decoding a stream.
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*/
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static bool
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decoder_run_stream(struct decoder *decoder, const char *uri)
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{
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struct decoder_control *dc = decoder->dc;
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struct input_stream *input_stream;
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bool success;
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decoder_unlock(dc);
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input_stream = decoder_input_stream_open(dc, uri);
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if (input_stream == NULL) {
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decoder_lock(dc);
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return false;
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}
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decoder_lock(dc);
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GSList *tried = NULL;
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success = dc->command == DECODE_COMMAND_STOP ||
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/* first we try mime types: */
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decoder_run_stream_mime_type(decoder, input_stream, &tried) ||
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/* if that fails, try suffix matching the URL: */
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decoder_run_stream_suffix(decoder, input_stream, uri,
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&tried) ||
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/* fallback to mp3: this is needed for bastard streams
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that don't have a suffix or set the mimeType */
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(tried == NULL &&
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decoder_run_stream_fallback(decoder, input_stream));
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g_slist_free(tried);
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decoder_unlock(dc);
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input_stream_close(input_stream);
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decoder_lock(dc);
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return success;
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}
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/**
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* Attempt to load replay gain data, and pass it to
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* decoder_replay_gain().
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*/
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static void
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decoder_load_replay_gain(struct decoder *decoder, const char *path_fs)
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{
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struct replay_gain_info info;
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if (replay_gain_ape_read(path_fs, &info))
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decoder_replay_gain(decoder, &info);
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}
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/**
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* Try decoding a file.
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*/
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static bool
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decoder_run_file(struct decoder *decoder, const char *path_fs)
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{
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struct decoder_control *dc = decoder->dc;
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const char *suffix = uri_get_suffix(path_fs);
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const struct decoder_plugin *plugin = NULL;
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if (suffix == NULL)
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return false;
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decoder_unlock(dc);
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decoder_load_replay_gain(decoder, path_fs);
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while ((plugin = decoder_plugin_from_suffix(suffix, plugin)) != NULL) {
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if (plugin->file_decode != NULL) {
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decoder_lock(dc);
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if (decoder_file_decode(plugin, decoder, path_fs))
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return true;
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decoder_unlock(dc);
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} else if (plugin->stream_decode != NULL) {
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struct input_stream *input_stream;
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bool success;
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input_stream = decoder_input_stream_open(dc, path_fs);
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if (input_stream == NULL)
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continue;
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decoder_lock(dc);
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success = decoder_stream_decode(plugin, decoder,
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input_stream);
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decoder_unlock(dc);
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input_stream_close(input_stream);
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if (success) {
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decoder_lock(dc);
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return true;
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}
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}
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}
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decoder_lock(dc);
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return false;
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}
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static void
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decoder_run_song(struct decoder_control *dc,
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const struct song *song, const char *uri)
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{
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decoder decoder(dc, dc->start_ms > 0);
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int ret;
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decoder.timestamp = 0.0;
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decoder.seeking = false;
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decoder.song_tag = song->tag != NULL && song_is_file(song)
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? tag_dup(song->tag) : NULL;
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decoder.stream_tag = NULL;
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decoder.decoder_tag = NULL;
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decoder.chunk = NULL;
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dc->state = DECODE_STATE_START;
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decoder_command_finished_locked(dc);
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pcm_convert_init(&decoder.conv_state);
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ret = song_is_file(song)
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? decoder_run_file(&decoder, uri)
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: decoder_run_stream(&decoder, uri);
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decoder_unlock(dc);
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pcm_convert_deinit(&decoder.conv_state);
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/* flush the last chunk */
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if (decoder.chunk != NULL)
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decoder_flush_chunk(&decoder);
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if (decoder.song_tag != NULL)
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tag_free(decoder.song_tag);
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if (decoder.stream_tag != NULL)
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tag_free(decoder.stream_tag);
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if (decoder.decoder_tag != NULL)
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tag_free(decoder.decoder_tag);
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decoder_lock(dc);
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if (ret)
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dc->state = DECODE_STATE_STOP;
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else {
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dc->state = DECODE_STATE_ERROR;
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const char *error_uri = song->uri;
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char *allocated = uri_remove_auth(error_uri);
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if (allocated != NULL)
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error_uri = allocated;
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dc->error = g_error_new(decoder_quark(), 0,
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"Failed to decode %s", error_uri);
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g_free(allocated);
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}
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}
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static void
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decoder_run(struct decoder_control *dc)
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{
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dc_clear_error(dc);
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const struct song *song = dc->song;
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char *uri;
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assert(song != NULL);
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if (song_is_file(song))
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uri = map_song_fs(song);
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else
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uri = song_get_uri(song);
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if (uri == NULL) {
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dc->state = DECODE_STATE_ERROR;
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dc->error = g_error_new(decoder_quark(), 0,
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"Failed to map song");
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decoder_command_finished_locked(dc);
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return;
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}
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decoder_run_song(dc, song, uri);
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g_free(uri);
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}
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static gpointer
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decoder_task(gpointer arg)
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{
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struct decoder_control *dc = (struct decoder_control *)arg;
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decoder_lock(dc);
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do {
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assert(dc->state == DECODE_STATE_STOP ||
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dc->state == DECODE_STATE_ERROR);
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switch (dc->command) {
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case DECODE_COMMAND_START:
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dc_mixramp_start(dc, NULL);
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dc_mixramp_prev_end(dc, dc->mixramp_end);
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dc->mixramp_end = NULL; /* Don't free, it's copied above. */
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dc->replay_gain_prev_db = dc->replay_gain_db;
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dc->replay_gain_db = 0;
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/* fall through */
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case DECODE_COMMAND_SEEK:
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decoder_run(dc);
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break;
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case DECODE_COMMAND_STOP:
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decoder_command_finished_locked(dc);
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break;
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case DECODE_COMMAND_NONE:
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decoder_wait(dc);
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break;
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}
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} while (dc->command != DECODE_COMMAND_NONE || !dc->quit);
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decoder_unlock(dc);
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return NULL;
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}
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void
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decoder_thread_start(struct decoder_control *dc)
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{
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GError *e = NULL;
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assert(dc->thread == NULL);
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dc->quit = false;
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dc->thread = g_thread_create(decoder_task, dc, true, &e);
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if (dc->thread == NULL)
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MPD_ERROR("Failed to spawn decoder task: %s", e->message);
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}
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