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

   1 /*
   2  * consumer_sdl.c -- A Simple DirectMedia Layer consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Dan Dennedy <dan@dennedy.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software Foundation,
  18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19  */
  20
  21 #include "consumer_sdl.h"
  22 #include <framework/mlt_frame.h>
  23 #include <framework/mlt_deque.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <pthread.h>
  28 #include <SDL/SDL.h>
  29 #include <SDL/SDL_syswm.h>
  30 #include <sys/time.h>
  31
  32 /** This classes definition.
  33 */
  34
  35 typedef struct consumer_sdl_s *consumer_sdl;
  36
  37 struct consumer_sdl_s
  38 {
  39         struct mlt_consumer_s parent;
  40         mlt_properties properties;
  41         mlt_deque queue;
  42         pthread_t thread;
  43         int running;
  44         uint8_t audio_buffer[ 4096 * 10 ];
  45         int audio_avail;
  46         pthread_mutex_t audio_mutex;
  47         pthread_cond_t audio_cond;
  48         pthread_mutex_t video_mutex;
  49         pthread_cond_t video_cond;
  50         int window_width;
  51         int window_height;
  52         float aspect_ratio;
  53         float display_aspect;
  54         double last_frame_aspect;
  55         int width;
  56         int height;
  57         int playing;
  58         int sdl_flags;
  59         SDL_Surface *sdl_screen;
  60         SDL_Overlay *sdl_overlay;
  61         SDL_Rect rect;
  62         uint8_t *buffer;
  63 };
  64
  65 /** Forward references to static functions.
  66 */
  67
  68 static int consumer_start( mlt_consumer parent );
  69 static int consumer_stop( mlt_consumer parent );
  70 static int consumer_is_stopped( mlt_consumer parent );
  71 static void consumer_close( mlt_consumer parent );
  72 static void *consumer_thread( void * );
  73 static int consumer_get_dimensions( int *width, int *height );
  74
  75 /** This is what will be called by the factory - anything can be passed in
  76         via the argument, but keep it simple.
  77 */
  78
  79 mlt_consumer consumer_sdl_init( char *arg )
  80 {
  81         // Create the consumer object
  82         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  83
  84         // If no malloc'd and consumer init ok
  85         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  86         {
  87                 // Create the queue
  88                 this->queue = mlt_deque_init( );
  89
  90                 // Get the parent consumer object
  91                 mlt_consumer parent = &this->parent;
  92
  93                 // We have stuff to clean up, so override the close method
  94                 parent->close = consumer_close;
  95
  96                 // get a handle on properties
  97                 mlt_service service = mlt_consumer_service( parent );
  98                 this->properties = mlt_service_properties( service );
  99
 100                 // Set the default volume
 101                 mlt_properties_set_double( this->properties, "volume", 1.0 );
 102
 103                 // This is the initialisation of the consumer
 104                 pthread_mutex_init( &this->audio_mutex, NULL );
 105                 pthread_cond_init( &this->audio_cond, NULL);
 106                 pthread_mutex_init( &this->video_mutex, NULL );
 107                 pthread_cond_init( &this->video_cond, NULL);
 108
 109                 // Default scaler (for now we'll use nearest)
 110                 mlt_properties_set( this->properties, "rescale", "nearest" );
 111
 112                 // Default buffer for low latency
 113                 mlt_properties_set_int( this->properties, "buffer", 1 );
 114
 115                 // Default progressive true
 116                 mlt_properties_set_int( this->properties, "progressive", 0 );
 117
 118                 // Default audio buffer
 119                 mlt_properties_set_int( this->properties, "audio_buffer", 1024 );
 120
 121                 // Get sample aspect ratio
 122                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 123
 124                 // Default display aspect ratio
 125                 this->display_aspect = 4.0 / 3.0;
 126
 127                 // process actual param
 128                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 129                 {
 130                         this->width = mlt_properties_get_int( this->properties, "width" );
 131                         this->height = mlt_properties_get_int( this->properties, "height" );
 132
 133                         // Default window size
 134                         this->window_width = ( float )this->height * this->display_aspect;
 135                         this->window_height = this->height;
 136                 }
 137                 else
 138                 {
 139                         if ( (int)( ( float )this->width / this->height * 1000 ) !=
 140                                  (int)( this->display_aspect * 1000 ) )
 141                         {
 142                                 // Override these
 143                                 this->display_aspect = ( float )this->width / this->height;
 144                                 this->aspect_ratio = 1.0;
 145                                 mlt_properties_set_double( this->properties, "aspect_ratio", this->aspect_ratio );
 146                         }
 147
 148                         // Set window size
 149                         this->window_width = this->width;
 150                         this->window_height = this->height;
 151                 }
 152
 153                 // Set the sdl flags
 154                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 155
 156                 // Allow thread to be started/stopped
 157                 parent->start = consumer_start;
 158                 parent->stop = consumer_stop;
 159                 parent->is_stopped = consumer_is_stopped;
 160
 161                 // Return the consumer produced
 162                 return parent;
 163         }
 164
 165         // malloc or consumer init failed
 166         free( this );
 167
 168         // Indicate failure
 169         return NULL;
 170 }
 171
 172 int consumer_start( mlt_consumer parent )
 173 {
 174         consumer_sdl this = parent->child;
 175
 176         if ( !this->running )
 177         {
 178                 pthread_attr_t thread_attributes;
 179
 180                 this->running = 1;
 181
 182                 // Allow the user to force resizing to window size
 183                 if ( mlt_properties_get_int( this->properties, "resize" ) )
 184                 {
 185                         mlt_properties_set_int( this->properties, "width", this->width );
 186                         mlt_properties_set_int( this->properties, "height", this->height );
 187                 }
 188
 189                 // Inherit the scheduling priority
 190                 pthread_attr_init( &thread_attributes );
 191                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 192
 193                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 194         }
 195
 196         return 0;
 197 }
 198
 199 int consumer_stop( mlt_consumer parent )
 200 {
 201         // Get the actual object
 202         consumer_sdl this = parent->child;
 203
 204         if ( this->running )
 205         {
 206                 // Kill the thread and clean up
 207                 this->running = 0;
 208
 209                 pthread_mutex_lock( &this->audio_mutex );
 210                 pthread_cond_broadcast( &this->audio_cond );
 211                 pthread_mutex_unlock( &this->audio_mutex );
 212
 213                 pthread_join( this->thread, NULL );
 214         }
 215
 216         return 0;
 217 }
 218
 219 int consumer_is_stopped( mlt_consumer parent )
 220 {
 221         consumer_sdl this = parent->child;
 222         return !this->running;
 223 }
 224
 225 static int sdl_lock_display( )
 226 {
 227         SDL_Surface *screen = SDL_GetVideoSurface( );
 228         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 229 }
 230
 231 static void sdl_unlock_display( )
 232 {
 233         SDL_Surface *screen = SDL_GetVideoSurface( );
 234         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 235                 SDL_UnlockSurface( screen );
 236 }
 237
 238 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 239 {
 240         consumer_sdl this = udata;
 241
 242         // Get the volume
 243         float volume = mlt_properties_get_double( this->properties, "volume" );
 244
 245         pthread_mutex_lock( &this->audio_mutex );
 246
 247         // Block until audio received
 248         while ( this->running && len > this->audio_avail )
 249                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 250
 251         if ( this->audio_avail >= len )
 252         {
 253                 // Place in the audio buffer
 254                 memcpy( stream, this->audio_buffer, len );
 255
 256                 // Remove len from the audio available
 257                 this->audio_avail -= len;
 258
 259                 // Remove the samples
 260                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 261         }
 262         else
 263         {
 264                 // Just to be safe, wipe the stream first
 265                 memset( stream, 0, len );
 266
 267                 // Copy what we have into the stream
 268                 memcpy( stream, this->audio_buffer, this->audio_avail );
 269
 270                 // Mix the audio
 271                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 272
 273                 // No audio left
 274                 this->audio_avail = 0;
 275         }
 276
 277         // We're definitely playing now
 278         this->playing = 1;
 279
 280         pthread_cond_broadcast( &this->audio_cond );
 281         pthread_mutex_unlock( &this->audio_mutex );
 282 }
 283
 284 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 285 {
 286         // Get the properties of this consumer
 287         mlt_properties properties = this->properties;
 288         mlt_audio_format afmt = mlt_audio_pcm;
 289
 290         // Set the preferred params of the test card signal
 291         int channels = mlt_properties_get_int( properties, "channels" );
 292         int frequency = mlt_properties_get_int( properties, "frequency" );
 293         static int counter = 0;
 294
 295         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 296
 297         int16_t *pcm;
 298         int bytes;
 299
 300         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 301         *duration = ( ( samples * 1000 ) / frequency );
 302
 303         if ( mlt_properties_get_int( properties, "audio_off" ) )
 304         {
 305                 this->playing = 1;
 306                 init_audio = 1;
 307                 return init_audio;
 308         }
 309
 310         if ( init_audio == 1 )
 311         {
 312                 SDL_AudioSpec request;
 313                 SDL_AudioSpec got;
 314
 315                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 316
 317                 // specify audio format
 318                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 319                 this->playing = 0;
 320                 request.freq = frequency;
 321                 request.format = AUDIO_S16;
 322                 request.channels = channels;
 323                 request.samples = audio_buffer;
 324                 request.callback = sdl_fill_audio;
 325                 request.userdata = (void *)this;
 326                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 327                 {
 328                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 329                         init_audio = 2;
 330                 }
 331                 else if ( got.size != 0 )
 332                 {
 333                         SDL_PauseAudio( 0 );
 334                         init_audio = 0;
 335                 }
 336         }
 337
 338         if ( init_audio == 0 )
 339         {
 340                 mlt_properties properties = mlt_frame_properties( frame );
 341                 bytes = ( samples * channels * 2 );
 342                 pthread_mutex_lock( &this->audio_mutex );
 343                 while ( this->running && bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 344                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 345                 if ( this->running )
 346                 {
 347                         if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 348                                 memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 349                         else
 350                                 memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 351                         this->audio_avail += bytes;
 352                 }
 353                 pthread_cond_broadcast( &this->audio_cond );
 354                 pthread_mutex_unlock( &this->audio_mutex );
 355         }
 356         else
 357         {
 358                 this->playing = 1;
 359         }
 360
 361         return init_audio;
 362 }
 363
 364 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 365 {
 366         // Get the properties of this consumer
 367         mlt_properties properties = this->properties;
 368
 369         mlt_image_format vfmt = mlt_image_yuv422;
 370         int width = this->width, height = this->height;
 371         uint8_t *image;
 372         int changed = 0;
 373
 374         if ( mlt_properties_get_int( properties, "video_off" ) == 0 )
 375         {
 376                 // Get the image, width and height
 377                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 378
 379                 // Handle events
 380                 if ( this->sdl_screen != NULL )
 381                 {
 382                         SDL_Event event;
 383
 384                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 385
 386                         while ( SDL_PollEvent( &event ) )
 387                         {
 388                                 switch( event.type )
 389                                 {
 390                                         case SDL_VIDEORESIZE:
 391                                                 this->window_width = event.resize.w;
 392                                                 this->window_height = event.resize.h;
 393                                                 changed = 1;
 394                                                 break;
 395                                         case SDL_QUIT:
 396                                                 this->running = 0;
 397                                                 break;
 398                                         case SDL_KEYDOWN:
 399                                                 {
 400                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 401                                                         char keyboard[ 2 ] = " ";
 402                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 403                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 404                                                         {
 405                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 406                                                                 callback( producer, keyboard );
 407                                                         }
 408                                                 }
 409                                                 break;
 410                                 }
 411                         }
 412                 }
 413
 414                 if ( width != this->width || height != this->height || this->last_frame_aspect != mlt_frame_get_aspect_ratio( frame ) )
 415                 {
 416                         this->width = width;
 417                         this->height = height;
 418                         this->last_frame_aspect = mlt_frame_get_aspect_ratio( frame );
 419                         changed = 1;
 420                 }
 421
 422                 if ( this->sdl_screen == NULL || changed )
 423                 {
 424                         // Determine frame's display aspect ratio
 425                         float frame_aspect = mlt_frame_get_aspect_ratio( frame ) * this->width / this->height;
 426
 427                         // Determine window's new display aspect ratio
 428                         float this_aspect = ( float )this->window_width / this->window_height;
 429
 430                         // If using hardware scaler
 431                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 432                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 433                         {
 434                                 // Special case optimisation to negate odd effect of sample aspect ratio
 435                                 // not corresponding exactly with image resolution.
 436                                 if ( ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) ) &&
 437                                          ( (int)( mlt_frame_get_aspect_ratio( frame ) * 1000 ) == (int)( this->aspect_ratio * 1000 ) ) )
 438                                 {
 439                                         this->rect.w = this->window_width;
 440                                         this->rect.h = this->window_height;
 441                                 }
 442                                 else
 443                                 {
 444                                         // Use hardware scaler to normalise display aspect ratio
 445                                         this->rect.w = frame_aspect / this_aspect * this->window_width;
 446                                         this->rect.h = this->window_height;
 447                                         if ( this->rect.w > this->window_width )
 448                                         {
 449                                                 this->rect.w = this->window_width;
 450                                                 this->rect.h = this_aspect / frame_aspect * this->window_height;
 451                                         }
 452                                 }
 453                         }
 454                         // Special case optimisation to negate odd effect of sample aspect ratio
 455                         // not corresponding exactly with image resolution.
 456                         else if ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) )
 457                         {
 458                                 this->rect.w = this->window_width;
 459                                 this->rect.h = this->window_height;
 460                         }
 461                         // Use hardware scaler to normalise sample aspect ratio
 462                         else if ( this->window_height * this->display_aspect > this->window_width )
 463                         {
 464                                 this->rect.w = this->window_width;
 465                                 this->rect.h = this->window_width / this->display_aspect;
 466                         }
 467                         else
 468                         {
 469                                 this->rect.w = this->window_height * this->display_aspect;
 470                                 this->rect.h = this->window_height;
 471                         }
 472
 473                         this->rect.x = ( this->window_width - this->rect.w ) / 2;
 474                         this->rect.y = ( this->window_height - this->rect.h ) / 2;
 475
 476                         mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 477                         mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 478                         mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 479                         mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 480
 481                         // Force an overlay recreation
 482                         if ( this->sdl_overlay != NULL )
 483                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 484
 485                         // open SDL window with video overlay, if possible
 486                         sdl_lock_display();
 487                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 488                         sdl_unlock_display();
 489
 490                         if ( this->sdl_screen != NULL )
 491                         {
 492                                 SDL_SetClipRect( this->sdl_screen, &this->rect );
 493                                 sdl_lock_display();
 494                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width, this->height, SDL_YUY2_OVERLAY, this->sdl_screen );
 495                                 sdl_unlock_display();
 496                         }
 497                 }
 498
 499                 if ( mlt_properties_get_int( properties, "changed" ) )
 500                 {
 501                         sdl_lock_display();
 502                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 503                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 504                         SDL_Flip( this->sdl_screen );
 505                         sdl_unlock_display();
 506                         mlt_properties_set_int( properties, "changed", 0 );
 507                 }
 508
 509                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 510                 {
 511                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 512                         sdl_lock_display();
 513                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 514                         {
 515                                 if ( image != NULL )
 516                                         memcpy( this->buffer, image, width * height * 2 );
 517                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 518                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 519                         }
 520                         sdl_unlock_display();
 521                 }
 522         }
 523
 524         return 0;
 525 }
 526
 527 static void *video_thread( void *arg )
 528 {
 529         // Identify the arg
 530         consumer_sdl this = arg;
 531
 532         // Obtain time of thread start
 533         struct timeval now;
 534         int64_t start = 0;
 535         int64_t elapsed = 0;
 536         struct timespec tm;
 537         mlt_frame next = NULL;
 538         mlt_properties properties = NULL;
 539         double speed = 0;
 540
 541         // Get real time flag
 542         int real_time = mlt_properties_get_int( this->properties, "real_time" );
 543
 544         // Get the current time
 545         gettimeofday( &now, NULL );
 546
 547         // Determine start time
 548         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 549
 550         while ( this->running )
 551         {
 552                 // Pop the next frame
 553                 pthread_mutex_lock( &this->video_mutex );
 554                 while ( ( next = mlt_deque_pop_front( this->queue ) ) == NULL && this->running )
 555                         pthread_cond_wait( &this->video_cond, &this->video_mutex );
 556                 pthread_mutex_unlock( &this->video_mutex );
 557
 558                 // Get the properties
 559                 properties =  mlt_frame_properties( next );
 560
 561                 // Get the speed of the frame
 562                 speed = mlt_properties_get_double( properties, "_speed" );
 563
 564                 // Get the current time
 565                 gettimeofday( &now, NULL );
 566
 567                 // Get the elapsed time
 568                 elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 569
 570                 // See if we have to delay the display of the current frame
 571                 if ( mlt_properties_get_int( properties, "rendered" ) == 1 && this->running )
 572                 {
 573                         // Obtain the scheduled playout time
 574                         mlt_position scheduled = mlt_properties_get_position( properties, "playtime" );
 575
 576                         // Determine the difference between the elapsed time and the scheduled playout time
 577                         mlt_position difference = scheduled - elapsed;
 578
 579                         // Smooth playback a bit
 580                         if ( real_time && ( difference > 20000 && speed == 1.0 ) )
 581                         {
 582                                 tm.tv_sec = difference / 1000000;
 583                                 tm.tv_nsec = ( difference % 1000000 ) * 500;
 584                                 nanosleep( &tm, NULL );
 585                         }
 586
 587                         // Show current frame if not too old
 588                         if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( this->queue ) < 2 ) )
 589                                 consumer_play_video( this, next );
 590
 591                         // If the queue is empty, recalculate start to allow build up again
 592                         if ( real_time && ( mlt_deque_count( this->queue ) == 0 && speed == 1.0 ) )
 593                         {
 594                                 gettimeofday( &now, NULL );
 595                                 start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
 596                         }
 597                 }
 598
 599                 // This frame can now be closed
 600                 mlt_frame_close( next );
 601         }
 602
 603         mlt_consumer_stopped( &this->parent );
 604
 605         return NULL;
 606 }
 607
 608 /** Threaded wrapper for pipe.
 609 */
 610
 611 static void *consumer_thread( void *arg )
 612 {
 613         // Identify the arg
 614         consumer_sdl this = arg;
 615
 616         // Get the consumer
 617         mlt_consumer consumer = &this->parent;
 618
 619         // Video thread
 620         pthread_t thread;
 621
 622         // internal intialization
 623         int init_audio = 1;
 624         int init_video = 1;
 625         mlt_frame frame = NULL;
 626         mlt_properties properties = NULL;
 627         int duration = 0;
 628         int64_t playtime = 0;
 629         struct timespec tm = { 0, 100000 };
 630
 631         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 632         {
 633                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 634                 return NULL;
 635         }
 636
 637         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 638         SDL_EnableUNICODE( 1 );
 639
 640         // Loop until told not to
 641         while( this->running )
 642         {
 643                 // Get a frame from the attached producer
 644                 frame = mlt_consumer_rt_frame( consumer );
 645
 646                 // Ensure that we have a frame
 647                 if ( frame != NULL )
 648                 {
 649                         // Get the frame properties
 650                         properties =  mlt_frame_properties( frame );
 651
 652                         // Play audio
 653                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 654
 655                         // Determine the start time now
 656                         if ( this->playing && init_video )
 657                         {
 658                                 // Create the video thread
 659                                 pthread_create( &thread, NULL, video_thread, this );
 660
 661                                 // Video doesn't need to be initialised any more
 662                                 init_video = 0;
 663                         }
 664
 665                         // Set playtime for this frame
 666                         mlt_properties_set_position( properties, "playtime", playtime );
 667
 668                         while ( this->running && mlt_deque_count( this->queue ) > 15 )
 669                                 nanosleep( &tm, NULL );
 670
 671                         // Push this frame to the back of the queue
 672                         pthread_mutex_lock( &this->video_mutex );
 673                         mlt_deque_push_back( this->queue, frame );
 674                         pthread_cond_broadcast( &this->video_cond );
 675                         pthread_mutex_unlock( &this->video_mutex );
 676
 677                         // Calculate the next playtime
 678                         playtime += ( duration * 1000 );
 679                 }
 680         }
 681
 682         // Kill the video thread
 683         if ( init_video == 0 )
 684         {
 685                 pthread_mutex_lock( &this->video_mutex );
 686                 pthread_cond_broadcast( &this->video_cond );
 687                 pthread_mutex_unlock( &this->video_mutex );
 688                 pthread_join( thread, NULL );
 689         }
 690
 691         // internal cleanup
 692         if ( this->sdl_overlay != NULL )
 693                 SDL_FreeYUVOverlay( this->sdl_overlay );
 694         SDL_Quit( );
 695
 696         while( mlt_deque_count( this->queue ) )
 697                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 698
 699         this->sdl_screen = NULL;
 700         this->sdl_overlay = NULL;
 701         this->audio_avail = 0;
 702
 703         return NULL;
 704 }
 705
 706 static int consumer_get_dimensions( int *width, int *height )
 707 {
 708         int changed = 0;
 709
 710         // SDL windows manager structure
 711         SDL_SysWMinfo wm;
 712
 713         // Specify the SDL Version
 714         SDL_VERSION( &wm.version );
 715
 716         // Lock the display
 717         sdl_lock_display();
 718
 719         // Get the wm structure
 720         if ( SDL_GetWMInfo( &wm ) == 1 )
 721         {
 722                 // Check that we have the X11 wm
 723                 if ( wm.subsystem == SDL_SYSWM_X11 )
 724                 {
 725                         // Get the SDL window
 726                         Window window = wm.info.x11.window;
 727
 728                         // Get the display session
 729                         Display *display = wm.info.x11.display;
 730
 731                         // Get the window attributes
 732                         XWindowAttributes attr;
 733                         XGetWindowAttributes( display, window, &attr );
 734
 735                         // Determine whether window has changed
 736                         changed = *width != attr.width || *height != attr.height;
 737
 738                         // Return width and height
 739                         *width = attr.width;
 740                         *height = attr.height;
 741                 }
 742         }
 743
 744         // Unlock the display
 745         sdl_lock_display();
 746
 747         return changed;
 748 }
 749
 750 /** Callback to allow override of the close method.
 751 */
 752
 753 static void consumer_close( mlt_consumer parent )
 754 {
 755         // Get the actual object
 756         consumer_sdl this = parent->child;
 757
 758         // Stop the consumer
 759         mlt_consumer_stop( parent );
 760
 761         // Close the queue
 762         mlt_deque_close( this->queue );
 763
 764         // Destroy mutexes
 765         pthread_mutex_destroy( &this->audio_mutex );
 766         pthread_cond_destroy( &this->audio_cond );
 767
 768         // Now clean up the rest
 769         mlt_consumer_close( parent );
 770
 771         // Finally clean up this
 772         free( this );
 773 }