aboutsummaryrefslogblamecommitdiffstats
path: root/src/decoder_thread.c
blob: c2bb655eafca219a04296734bce122013e4b8498 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
  
                                                          
                         









                                                                       



                                                                          

   
                   
                           
                            
                             
                         
                           
                        
                            
                         
                 
                 
                
                   
                 
                
                      
 

                 

                   


                                     
   











                                                                   
                                       


   






                                                                   

                                                                   
   

                                                                      
 
                             
                                
 
                                                                 
                         




                                                        
                            
         



                                                                  


                                
                            

                                                    
 
                                        

         










                                                
                  

 
           



                                                          


                                              

                                             

                                     
                                                         
 


                                                        
                                                                  
                                                           
 

                                    
                                                                    
 
                                  
 

                                                          
 
                                                        





                                                              
                               
                                            
                                

                                             
                             
                                         
                                                         
 


                                                        
                                    
 
                                                          
 
                                  
 

                                                          
 
                                                        

 
   













                                                            
                                                                        

                                                    

           

                                                                              
 

                                





                                            








                                                                            

                                    


                                                                             





                                                                 

                                                    


                                                                           
                                                            
 

                                
                                                 
                                                   



                             








                                                                               

                                    


                                                                             



















                                                                             
                                                            
 
                                                 
                                          



                           

                                                          
                                 


                             

                         

                             

                                                       
                                                                              
                                                                 

                                                                     

                                                                      

                                                                     
 

                            
                           
                                         


                         


   











                                                                      


                       
                                                              
 
                                                 
                                                     
                                                   



                             
                           
 

                                                   
                                                                               
                                                  
                                         



                                                                          
                                           
                                                           
                                                          
                                     
 

                                                                              
                                         
 
                                         
 
                                                                        
                                                                      
 
                                           
 
                                                         




                                                 


                 
                         


                     


                                                          
 

                                  
                                                         
                                              
          
                
 
                                
                                

                                                                  

                                   
                             
 
                                       
 
                                            
 

                                              
                                

                                                    
 
                           
 

                                                
                                  
 

                                              
 


                                           





                                              
                         
 
                                                                 

 

                                       
 
                                           

                  

                             

                                        

                                         

                          
                                               
                                                    


                       
                                        



                    

                          
 


                                         
 
            

                                                        
 
                                      
                                          



                                                                                    

                                                                     


                                          
                                         
                                        


                                         
                                                            


                                         
                                         
                              
                 
                                                                  
 
                           
 
                    
 
 

                                                
 
                         
 
                                   
 

                         

                                                                 
                                                                          
 
/*
 * Copyright (C) 2003-2011 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 "decoder_thread.h"
#include "decoder_control.h"
#include "decoder_internal.h"
#include "decoder_list.h"
#include "decoder_plugin.h"
#include "decoder_api.h"
#include "replay_gain_ape.h"
#include "input_stream.h"
#include "pipe.h"
#include "song.h"
#include "tag.h"
#include "mapper.h"
#include "path.h"
#include "uri.h"
#include "mpd_error.h"

#include <glib.h>

#include <unistd.h>

#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);

	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);

	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)
{
	union {
		const struct decoder_plugin *in;
		gpointer out;
	} u = { .in = plugin };

	return u.out;
}

/**
 * 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)
{
	struct decoder decoder = {
		.dc = dc,
		.initial_seek_pending = dc->start_ms > 0,
		.initial_seek_running = false,
	};
	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);

	dc->state = ret ? DECODE_STATE_STOP : DECODE_STATE_ERROR;
}

static void
decoder_run(struct decoder_control *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;
		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 = arg;

	decoder_lock(dc);

	do {
		assert(dc->state == DECODE_STATE_STOP ||
		       dc->state == DECODE_STATE_ERROR);

		switch (dc->command) {
		case DECODE_COMMAND_START:
			g_debug("clearing mixramp tags");
			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);
}