git.sesse.net Git - mlt/blob - src/modules/sdl/consumer_sdl_audio.c

   1 /*
   2  * consumer_sdl_audio.c -- A Simple DirectMedia Layer audio-only consumer
   3  * Copyright (C) 2009, 2010 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <framework/mlt_consumer.h>
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_deque.h>
  24 #include <framework/mlt_factory.h>
  25 #include <framework/mlt_filter.h>
  26 #include <framework/mlt_log.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <pthread.h>
  31 #include <SDL.h>
  32 #include <sys/time.h>
  33
  34 extern pthread_mutex_t mlt_sdl_mutex;
  35
  36 /** This classes definition.
  37 */
  38
  39 typedef struct consumer_sdl_s *consumer_sdl;
  40
  41 struct consumer_sdl_s
  42 {
  43         struct mlt_consumer_s parent;
  44         mlt_properties properties;
  45         mlt_deque queue;
  46         pthread_t thread;
  47         int joined;
  48         int running;
  49         uint8_t audio_buffer[ 4096 * 10 ];
  50         int audio_avail;
  51         pthread_mutex_t audio_mutex;
  52         pthread_cond_t audio_cond;
  53         pthread_mutex_t video_mutex;
  54         pthread_cond_t video_cond;
  55         int playing;
  56
  57         pthread_cond_t refresh_cond;
  58         pthread_mutex_t refresh_mutex;
  59         int refresh_count;
  60 };
  61
  62 /** Forward references to static functions.
  63 */
  64
  65 static int consumer_start( mlt_consumer parent );
  66 static int consumer_stop( mlt_consumer parent );
  67 static int consumer_is_stopped( mlt_consumer parent );
  68 static void consumer_close( mlt_consumer parent );
  69 static void *consumer_thread( void * );
  70 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer this, char *name );
  71
  72 /** This is what will be called by the factory - anything can be passed in
  73         via the argument, but keep it simple.
  74 */
  75
  76 mlt_consumer consumer_sdl_audio_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  77 {
  78         // Create the consumer object
  79         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  80
  81         // If no malloc'd and consumer init ok
  82         if ( this != NULL && mlt_consumer_init( &this->parent, this, profile ) == 0 )
  83         {
  84                 // Create the queue
  85                 this->queue = mlt_deque_init( );
  86
  87                 // Get the parent consumer object
  88                 mlt_consumer parent = &this->parent;
  89
  90                 // We have stuff to clean up, so override the close method
  91                 parent->close = consumer_close;
  92
  93                 // get a handle on properties
  94                 mlt_service service = MLT_CONSUMER_SERVICE( parent );
  95                 this->properties = MLT_SERVICE_PROPERTIES( service );
  96
  97                 // Set the default volume
  98                 mlt_properties_set_double( this->properties, "volume", 1.0 );
  99
 100                 // This is the initialisation of the consumer
 101                 pthread_mutex_init( &this->audio_mutex, NULL );
 102                 pthread_cond_init( &this->audio_cond, NULL);
 103                 pthread_mutex_init( &this->video_mutex, NULL );
 104                 pthread_cond_init( &this->video_cond, NULL);
 105
 106                 // Default scaler (for now we'll use nearest)
 107                 mlt_properties_set( this->properties, "rescale", "nearest" );
 108                 mlt_properties_set( this->properties, "deinterlace_method", "onefield" );
 109
 110                 // Default buffer for low latency
 111                 mlt_properties_set_int( this->properties, "buffer", 1 );
 112
 113                 // Default audio buffer
 114                 mlt_properties_set_int( this->properties, "audio_buffer", 512 );
 115
 116                 // Ensure we don't join on a non-running object
 117                 this->joined = 1;
 118
 119                 // Allow thread to be started/stopped
 120                 parent->start = consumer_start;
 121                 parent->stop = consumer_stop;
 122                 parent->is_stopped = consumer_is_stopped;
 123
 124                 // Initialize the refresh handler
 125                 pthread_cond_init( &this->refresh_cond, NULL );
 126                 pthread_mutex_init( &this->refresh_mutex, NULL );
 127                 mlt_events_listen( MLT_CONSUMER_PROPERTIES( parent ), this, "property-changed", ( mlt_listener )consumer_refresh_cb );
 128
 129                 // Return the consumer produced
 130                 return parent;
 131         }
 132
 133         // malloc or consumer init failed
 134         free( this );
 135
 136         // Indicate failure
 137         return NULL;
 138 }
 139
 140 static void consumer_refresh_cb( mlt_consumer sdl, mlt_consumer parent, char *name )
 141 {
 142         if ( !strcmp( name, "refresh" ) )
 143         {
 144                 consumer_sdl this = parent->child;
 145                 pthread_mutex_lock( &this->refresh_mutex );
 146                 this->refresh_count = this->refresh_count <= 0 ? 1 : this->refresh_count + 1;
 147                 pthread_cond_broadcast( &this->refresh_cond );
 148                 pthread_mutex_unlock( &this->refresh_mutex );
 149         }
 150 }
 151
 152 int consumer_start( mlt_consumer parent )
 153 {
 154         consumer_sdl this = parent->child;
 155
 156         if ( !this->running )
 157         {
 158                 consumer_stop( parent );
 159
 160                 this->running = 1;
 161                 this->joined = 0;
 162
 163
 164                 pthread_mutex_lock( &mlt_sdl_mutex );
 165                 int ret = SDL_Init( SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE );
 166                 pthread_mutex_unlock( &mlt_sdl_mutex );
 167                 if ( ret < 0 )
 168                 {
 169                         mlt_log_error( MLT_CONSUMER_SERVICE(parent), "Failed to initialize SDL: %s\n", SDL_GetError() );
 170                         return -1;
 171                 }
 172
 173                 pthread_create( &this->thread, NULL, consumer_thread, this );
 174         }
 175
 176         return 0;
 177 }
 178
 179 int consumer_stop( mlt_consumer parent )
 180 {
 181         // Get the actual object
 182         consumer_sdl this = parent->child;
 183
 184         if ( this->joined == 0 )
 185         {
 186                 // Kill the thread and clean up
 187                 this->joined = 1;
 188                 this->running = 0;
 189
 190                 // Unlatch the consumer thread
 191                 pthread_mutex_lock( &this->refresh_mutex );
 192                 pthread_cond_broadcast( &this->refresh_cond );
 193                 pthread_mutex_unlock( &this->refresh_mutex );
 194
 195                 // Cleanup the main thread
 196 #ifndef WIN32
 197                 if ( this->thread )
 198 #endif
 199                         pthread_join( this->thread, NULL );
 200
 201                 // Unlatch the audio callback
 202                 pthread_mutex_lock( &this->audio_mutex );
 203                 pthread_cond_broadcast( &this->audio_cond );
 204                 pthread_mutex_unlock( &this->audio_mutex );
 205
 206                 SDL_QuitSubSystem( SDL_INIT_AUDIO );
 207         }
 208
 209         return 0;
 210 }
 211
 212 int consumer_is_stopped( mlt_consumer parent )
 213 {
 214         consumer_sdl this = parent->child;
 215         return !this->running;
 216 }
 217
 218 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 219 {
 220         consumer_sdl this = udata;
 221
 222         // Get the volume
 223         double volume = mlt_properties_get_double( this->properties, "volume" );
 224
 225         pthread_mutex_lock( &this->audio_mutex );
 226
 227         // Block until audio received
 228         while ( this->running && len > this->audio_avail )
 229                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 230
 231         if ( this->audio_avail >= len )
 232         {
 233                 // Place in the audio buffer
 234                 if ( volume != 1.0 )
 235                         SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 236                 else
 237                         memcpy( stream, this->audio_buffer, len );
 238
 239                 // Remove len from the audio available
 240                 this->audio_avail -= len;
 241
 242                 // Remove the samples
 243                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 244         }
 245         else
 246         {
 247                 // Just to be safe, wipe the stream first
 248                 memset( stream, 0, len );
 249
 250                 // Mix the audio
 251                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 252
 253                 // No audio left
 254                 this->audio_avail = 0;
 255         }
 256
 257         // We're definitely playing now
 258         this->playing = 1;
 259
 260         pthread_cond_broadcast( &this->audio_cond );
 261         pthread_mutex_unlock( &this->audio_mutex );
 262 }
 263
 264 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 265 {
 266         // Get the properties of this consumer
 267         mlt_properties properties = this->properties;
 268         mlt_audio_format afmt = mlt_audio_s16;
 269
 270         // Set the preferred params of the test card signal
 271         int channels = mlt_properties_get_int( properties, "channels" );
 272         int frequency = mlt_properties_get_int( properties, "frequency" );
 273         static int counter = 0;
 274
 275         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 276
 277         int16_t *pcm;
 278         int bytes;
 279
 280         mlt_frame_get_audio( frame, (void**) &pcm, &afmt, &frequency, &channels, &samples );
 281         *duration = ( ( samples * 1000 ) / frequency );
 282
 283         if ( mlt_properties_get_int( properties, "audio_off" ) )
 284         {
 285                 this->playing = 1;
 286                 init_audio = 1;
 287                 return init_audio;
 288         }
 289
 290         if ( init_audio == 1 )
 291         {
 292                 SDL_AudioSpec request;
 293                 SDL_AudioSpec got;
 294
 295                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 296
 297                 // specify audio format
 298                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 299                 this->playing = 0;
 300                 request.freq = frequency;
 301                 request.format = AUDIO_S16SYS;
 302                 request.channels = channels;
 303                 request.samples = audio_buffer;
 304                 request.callback = sdl_fill_audio;
 305                 request.userdata = (void *)this;
 306                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 307                 {
 308                         mlt_log_error( MLT_CONSUMER_SERVICE( this ), "SDL failed to open audio: %s\n", SDL_GetError() );
 309                         init_audio = 2;
 310                 }
 311                 else if ( got.size != 0 )
 312                 {
 313                         SDL_PauseAudio( 0 );
 314                         init_audio = 0;
 315                 }
 316         }
 317
 318         if ( init_audio == 0 )
 319         {
 320                 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 321                 bytes = ( samples * channels * 2 );
 322                 pthread_mutex_lock( &this->audio_mutex );
 323                 while ( this->running && bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 324                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 325                 if ( this->running )
 326                 {
 327                         if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 328                                 memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 329                         else
 330                                 memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 331                         this->audio_avail += bytes;
 332                 }
 333                 pthread_cond_broadcast( &this->audio_cond );
 334                 pthread_mutex_unlock( &this->audio_mutex );
 335         }
 336         else
 337         {
 338                 this->playing = 1;
 339         }
 340
 341         return init_audio;
 342 }
 343
 344 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 345 {
 346         // Get the properties of this consumer
 347         mlt_properties properties = this->properties;
 348         if ( this->running && !mlt_consumer_is_stopped( &this->parent ) )
 349                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 350
 351         return 0;
 352 }
 353
 354 static void *video_thread( void *arg )
 355 {
 356         // Identify the arg
 357         consumer_sdl this = arg;
 358
 359         // Obtain time of thread start
 360         struct timeval now;
 361         int64_t start = 0;
 362         int64_t elapsed = 0;
 363         struct timespec tm;
 364         mlt_frame next = NULL;
 365         mlt_properties properties = NULL;
 366         double speed = 0;
 367
 368         // Get real time flag
 369         int real_time = mlt_properties_get_int( this->properties, "real_time" );
 370
 371         // Get the current time
 372         gettimeofday( &now, NULL );
 373
 374         // Determine start time
 375         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 376
 377         while ( this->running )
 378         {
 379                 // Pop the next frame
 380                 pthread_mutex_lock( &this->video_mutex );
 381                 next = mlt_deque_pop_front( this->queue );
 382                 while ( next == NULL && this->running )
 383                 {
 384                         pthread_cond_wait( &this->video_cond, &this->video_mutex );
 385                         next = mlt_deque_pop_front( this->queue );
 386                 }
 387                 pthread_mutex_unlock( &this->video_mutex );
 388
 389                 if ( !this->running || next == NULL ) break;
 390
 391                 // Get the properties
 392                 properties =  MLT_FRAME_PROPERTIES( next );
 393
 394                 // Get the speed of the frame
 395                 speed = mlt_properties_get_double( properties, "_speed" );
 396
 397                 // Get the current time
 398                 gettimeofday( &now, NULL );
 399
 400                 // Get the elapsed time
 401                 elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 402
 403                 // See if we have to delay the display of the current frame
 404                 if ( mlt_properties_get_int( properties, "rendered" ) == 1 && this->running )
 405                 {
 406                         // Obtain the scheduled playout time
 407                         int64_t scheduled = mlt_properties_get_int( properties, "playtime" );
 408
 409                         // Determine the difference between the elapsed time and the scheduled playout time
 410                         int64_t difference = scheduled - elapsed;
 411
 412                         // Smooth playback a bit
 413                         if ( real_time && ( difference > 20000 && speed == 1.0 ) )
 414                         {
 415                                 tm.tv_sec = difference / 1000000;
 416                                 tm.tv_nsec = ( difference % 1000000 ) * 500;
 417                                 nanosleep( &tm, NULL );
 418                         }
 419
 420                         // Show current frame if not too old
 421                         if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( this->queue ) < 2 ) )
 422                                 consumer_play_video( this, next );
 423
 424                         // If the queue is empty, recalculate start to allow build up again
 425                         if ( real_time && ( mlt_deque_count( this->queue ) == 0 && speed == 1.0 ) )
 426                         {
 427                                 gettimeofday( &now, NULL );
 428                                 start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
 429                         }
 430                 }
 431
 432                 // This frame can now be closed
 433                 mlt_frame_close( next );
 434                 next = NULL;
 435         }
 436
 437         if ( next != NULL )
 438                 mlt_frame_close( next );
 439
 440         mlt_consumer_stopped( &this->parent );
 441
 442         return NULL;
 443 }
 444
 445 /** Threaded wrapper for pipe.
 446 */
 447
 448 static void *consumer_thread( void *arg )
 449 {
 450         // Identify the arg
 451         consumer_sdl this = arg;
 452
 453         // Get the consumer
 454         mlt_consumer consumer = &this->parent;
 455
 456         // Get the properties
 457         mlt_properties consumer_props = MLT_CONSUMER_PROPERTIES( consumer );
 458
 459         // Video thread
 460         pthread_t thread;
 461
 462         // internal intialization
 463         int init_audio = 1;
 464         int init_video = 1;
 465         mlt_frame frame = NULL;
 466         mlt_properties properties = NULL;
 467         int duration = 0;
 468         int64_t playtime = 0;
 469         struct timespec tm = { 0, 100000 };
 470         int last_position = -1;
 471         this->refresh_count = 0;
 472
 473         // Loop until told not to
 474         while( this->running )
 475         {
 476                 // Get a frame from the attached producer
 477                 frame = mlt_consumer_rt_frame( consumer );
 478
 479                 // Ensure that we have a frame
 480                 if ( frame )
 481                 {
 482                         // Get the frame properties
 483                         properties =  MLT_FRAME_PROPERTIES( frame );
 484
 485                         // Get the speed of the frame
 486                         double speed = mlt_properties_get_double( properties, "_speed" );
 487
 488                         // Get refresh request for the current frame
 489                         int refresh = mlt_properties_get_int( consumer_props, "refresh" );
 490
 491                         // Clear refresh
 492                         mlt_events_block( consumer_props, consumer_props );
 493                         mlt_properties_set_int( consumer_props, "refresh", 0 );
 494                         mlt_events_unblock( consumer_props, consumer_props );
 495
 496                         // Play audio
 497                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 498
 499                         // Determine the start time now
 500                         if ( this->playing && init_video )
 501                         {
 502                                 // Create the video thread
 503                                 pthread_create( &thread, NULL, video_thread, this );
 504
 505                                 // Video doesn't need to be initialised any more
 506                                 init_video = 0;
 507                         }
 508
 509                         // Set playtime for this frame
 510                         mlt_properties_set_int( properties, "playtime", playtime );
 511
 512                         while ( this->running && speed != 0 && mlt_deque_count( this->queue ) > 15 )
 513                                 nanosleep( &tm, NULL );
 514
 515                         // Push this frame to the back of the queue
 516                         if ( this->running && speed )
 517                         {
 518                                 pthread_mutex_lock( &this->video_mutex );
 519                                 mlt_deque_push_back( this->queue, frame );
 520                                 pthread_cond_broadcast( &this->video_cond );
 521                                 pthread_mutex_unlock( &this->video_mutex );
 522
 523                                 // Calculate the next playtime
 524                                 playtime += ( duration * 1000 );
 525                         }
 526                         else if ( this->running )
 527                         {
 528                                 pthread_mutex_lock( &this->refresh_mutex );
 529                                 if ( refresh == 0 && this->refresh_count <= 0 )
 530                                 {
 531                                         consumer_play_video( this, frame );
 532                                         pthread_cond_wait( &this->refresh_cond, &this->refresh_mutex );
 533                                 }
 534                                 mlt_frame_close( frame );
 535                                 this->refresh_count --;
 536                                 pthread_mutex_unlock( &this->refresh_mutex );
 537                         }
 538                         else
 539                                 mlt_frame_close( frame );
 540
 541                         // Optimisation to reduce latency
 542                         if ( speed == 1.0 )
 543                         {
 544                                 if ( last_position != -1 && last_position + 1 != mlt_frame_get_position( frame ) )
 545                                         mlt_consumer_purge( consumer );
 546                                 last_position = mlt_frame_get_position( frame );
 547                         }
 548                         else
 549                         {
 550                                 mlt_consumer_purge( consumer );
 551                                 last_position = -1;
 552                         }
 553                 }
 554         }
 555
 556         // Kill the video thread
 557         if ( init_video == 0 )
 558         {
 559                 pthread_mutex_lock( &this->video_mutex );
 560                 pthread_cond_broadcast( &this->video_cond );
 561                 pthread_mutex_unlock( &this->video_mutex );
 562                 pthread_join( thread, NULL );
 563         }
 564
 565         while( mlt_deque_count( this->queue ) )
 566                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 567
 568         this->audio_avail = 0;
 569
 570         return NULL;
 571 }
 572
 573 /** Callback to allow override of the close method.
 574 */
 575
 576 static void consumer_close( mlt_consumer parent )
 577 {
 578         // Get the actual object
 579         consumer_sdl this = parent->child;
 580
 581         // Stop the consumer
 582         mlt_consumer_stop( parent );
 583
 584         // Now clean up the rest
 585         mlt_consumer_close( parent );
 586
 587         // Close the queue
 588         mlt_deque_close( this->queue );
 589
 590         // Destroy mutexes
 591         pthread_mutex_destroy( &this->audio_mutex );
 592         pthread_cond_destroy( &this->audio_cond );
 593         pthread_mutex_destroy( &this->video_mutex );
 594         pthread_cond_destroy( &this->video_cond );
 595         pthread_mutex_destroy( &this->refresh_mutex );
 596         pthread_cond_destroy( &this->refresh_cond );
 597
 598         // Finally clean up this
 599         free( this );
 600 }