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 * 19 ];
  45         int audio_avail;
  46         pthread_mutex_t audio_mutex;
  47         pthread_cond_t audio_cond;
  48         int window_width;
  49         int window_height;
  50         float aspect_ratio;
  51         float display_aspect;
  52         int width;
  53         int height;
  54         int playing;
  55         int sdl_flags;
  56         SDL_Surface *sdl_screen;
  57         SDL_Overlay *sdl_overlay;
  58         SDL_Rect rect;
  59         uint8_t *buffer;
  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 int consumer_get_dimensions( int *width, int *height );
  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_init( 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 ) == 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
 104                 // Default scaler (for now we'll use nearest)
 105                 mlt_properties_set( this->properties, "rescale", "nearest" );
 106
 107                 // Default buffer for low latency
 108                 mlt_properties_set_int( this->properties, "buffer", 1 );
 109
 110                 // Default progressive true
 111                 mlt_properties_set_int( this->properties, "progressive", 0 );
 112
 113                 // Default audio buffer
 114                 mlt_properties_set_int( this->properties, "audio_buffer", 1024 );
 115
 116                 // Get sample aspect ratio
 117                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 118
 119                 // Default display aspect ratio
 120                 this->display_aspect = 4.0 / 3.0;
 121
 122                 // process actual param
 123                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 124                 {
 125                         this->width = mlt_properties_get_int( this->properties, "width" );
 126                         this->height = mlt_properties_get_int( this->properties, "height" );
 127
 128                         // Default window size
 129                         this->window_width = ( float )this->height * this->display_aspect + 0.5;
 130                         this->window_height = this->height;
 131                 }
 132                 else
 133                 {
 134                         if ( (int)( ( float )this->width / this->height * 1000 ) !=
 135                                  (int)( this->display_aspect * 1000 ) )
 136                         {
 137                                 // Override these
 138                                 this->display_aspect = ( float )this->width / this->height;
 139                                 this->aspect_ratio = 1.0;
 140                                 mlt_properties_set_double( this->properties, "aspect_ratio", this->aspect_ratio );
 141                         }
 142
 143                         // Set window size
 144                         this->window_width = this->width;
 145                         this->window_height = this->height;
 146                 }
 147
 148                 // Set the sdl flags
 149                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 150
 151                 // Allow thread to be started/stopped
 152                 parent->start = consumer_start;
 153                 parent->stop = consumer_stop;
 154                 parent->is_stopped = consumer_is_stopped;
 155
 156                 // Return the consumer produced
 157                 return parent;
 158         }
 159
 160         // malloc or consumer init failed
 161         free( this );
 162
 163         // Indicate failure
 164         return NULL;
 165 }
 166
 167 int consumer_start( mlt_consumer parent )
 168 {
 169         consumer_sdl this = parent->child;
 170
 171         if ( !this->running )
 172         {
 173                 pthread_attr_t thread_attributes;
 174
 175                 this->running = 1;
 176
 177                 // Allow the user to force resizing to window size
 178                 if ( mlt_properties_get_int( this->properties, "resize" ) )
 179                 {
 180                         mlt_properties_set_int( this->properties, "width", this->width );
 181                         mlt_properties_set_int( this->properties, "height", this->height );
 182                 }
 183
 184                 // Inherit the scheduling priority
 185                 pthread_attr_init( &thread_attributes );
 186                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 187
 188                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 189         }
 190
 191         return 0;
 192 }
 193
 194 int consumer_stop( mlt_consumer parent )
 195 {
 196         // Get the actual object
 197         consumer_sdl this = parent->child;
 198
 199         if ( this->running )
 200         {
 201                 // Kill the thread and clean up
 202                 this->running = 0;
 203
 204                 pthread_mutex_lock( &this->audio_mutex );
 205                 pthread_cond_broadcast( &this->audio_cond );
 206                 pthread_mutex_unlock( &this->audio_mutex );
 207
 208                 pthread_join( this->thread, NULL );
 209         }
 210
 211         return 0;
 212 }
 213
 214 int consumer_is_stopped( mlt_consumer parent )
 215 {
 216         consumer_sdl this = parent->child;
 217         return !this->running;
 218 }
 219
 220 static int sdl_lock_display( )
 221 {
 222         SDL_Surface *screen = SDL_GetVideoSurface( );
 223         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 224 }
 225
 226 static void sdl_unlock_display( )
 227 {
 228         SDL_Surface *screen = SDL_GetVideoSurface( );
 229         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 230                 SDL_UnlockSurface( screen );
 231 }
 232
 233 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 234 {
 235         consumer_sdl this = udata;
 236
 237         // Get the volume
 238         float volume = mlt_properties_get_double( this->properties, "volume" );
 239
 240         pthread_mutex_lock( &this->audio_mutex );
 241
 242         // Block until audio received
 243         while ( this->running && len > this->audio_avail )
 244                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 245
 246         if ( this->audio_avail >= len )
 247         {
 248                 // Place in the audio buffer
 249                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 250
 251                 // Remove len from the audio available
 252                 this->audio_avail -= len;
 253
 254                 // Remove the samples
 255                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 256         }
 257         else
 258         {
 259                 // Just to be safe, wipe the stream first
 260                 memset( stream, 0, len );
 261
 262                 // Copy what we have into the stream
 263                 memcpy( stream, this->audio_buffer, this->audio_avail );
 264
 265                 // Mix the audio
 266                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 267
 268                 // No audio left
 269                 this->audio_avail = 0;
 270         }
 271
 272         // We're definitely playing now
 273         this->playing = 1;
 274
 275         pthread_cond_broadcast( &this->audio_cond );
 276         pthread_mutex_unlock( &this->audio_mutex );
 277 }
 278
 279 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 280 {
 281         // Get the properties of this consumer
 282         mlt_properties properties = this->properties;
 283         mlt_audio_format afmt = mlt_audio_pcm;
 284
 285         // Set the preferred params of the test card signal
 286         int channels = mlt_properties_get_int( properties, "channels" );
 287         int frequency = mlt_properties_get_int( properties, "frequency" );
 288         static int counter = 0;
 289
 290         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 291
 292         int16_t *pcm;
 293         int bytes;
 294
 295         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 296         *duration = ( ( samples * 1000 ) / frequency );
 297
 298         if ( mlt_properties_get_int( properties, "audio_off" ) )
 299         {
 300                 this->playing = 1;
 301                 init_audio = 1;
 302                 return init_audio;
 303         }
 304
 305         if ( init_audio == 1 )
 306         {
 307                 SDL_AudioSpec request;
 308                 SDL_AudioSpec got;
 309
 310                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 311
 312                 // specify audio format
 313                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 314                 this->playing = 0;
 315                 request.freq = frequency;
 316                 request.format = AUDIO_S16;
 317                 request.channels = channels;
 318                 request.samples = audio_buffer;
 319                 request.callback = sdl_fill_audio;
 320                 request.userdata = (void *)this;
 321                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 322                 {
 323                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 324                         init_audio = 2;
 325                 }
 326                 else if ( got.size != 0 )
 327                 {
 328                         SDL_PauseAudio( 0 );
 329                         init_audio = 0;
 330                 }
 331         }
 332
 333         if ( init_audio == 0 )
 334         {
 335                 mlt_properties properties = mlt_frame_properties( frame );
 336                 bytes = ( samples * channels * 2 );
 337                 pthread_mutex_lock( &this->audio_mutex );
 338                 while ( bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 339                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 340                 if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 341                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 342                 else
 343                         memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 344                 this->audio_avail += bytes;
 345                 pthread_cond_broadcast( &this->audio_cond );
 346                 pthread_mutex_unlock( &this->audio_mutex );
 347         }
 348         else
 349         {
 350                 this->playing = 1;
 351         }
 352
 353         return init_audio;
 354 }
 355
 356 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 357 {
 358         // Get the properties of this consumer
 359         mlt_properties properties = this->properties;
 360
 361         mlt_image_format vfmt = mlt_image_yuv422;
 362         int width = this->width, height = this->height;
 363         uint8_t *image;
 364         int changed = 0;
 365
 366         if ( mlt_properties_get_int( properties, "video_off" ) == 0 )
 367         {
 368                 // Get the image, width and height
 369                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 370
 371                 // Handle events
 372                 if ( this->sdl_screen != NULL )
 373                 {
 374                         SDL_Event event;
 375
 376                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 377
 378                         while ( SDL_PollEvent( &event ) )
 379                         {
 380                                 switch( event.type )
 381                                 {
 382                                         case SDL_VIDEORESIZE:
 383                                                 this->window_width = event.resize.w;
 384                                                 this->window_height = event.resize.h;
 385                                                 changed = 1;
 386                                                 break;
 387                                         case SDL_QUIT:
 388                                                 this->running = 0;
 389                                                 break;
 390                                         case SDL_KEYDOWN:
 391                                                 {
 392                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 393                                                         char keyboard[ 2 ] = " ";
 394                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 395                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 396                                                         {
 397                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 398                                                                 callback( producer, keyboard );
 399                                                         }
 400                                                 }
 401                                                 break;
 402                                 }
 403                         }
 404                 }
 405
 406                 if ( width != this->width || height != this->height )
 407                 {
 408                         this->width = width;
 409                         this->height = height;
 410                         changed = 1;
 411                 }
 412
 413                 if ( this->sdl_screen == NULL || changed )
 414                 {
 415                         // Determine frame's display aspect ratio
 416                         float frame_aspect = mlt_frame_get_aspect_ratio( frame ) * this->width / this->height;
 417
 418                         // Determine window's new display aspect ratio
 419                         float this_aspect = ( float )this->window_width / this->window_height;
 420
 421                         // If using hardware scaler
 422                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 423                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 424                         {
 425                                 // Special case optimisation to negate odd effect of sample aspect ratio
 426                                 // not corresponding exactly with image resolution.
 427                                 if ( ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) ) &&
 428                                          ( (int)( mlt_frame_get_aspect_ratio( frame ) * 1000 ) == (int)( this->aspect_ratio * 1000 ) ) )
 429                                 {
 430                                         this->rect.w = this->window_width;
 431                                         this->rect.h = this->window_height;
 432                                 }
 433                                 else
 434                                 {
 435                                         // Use hardware scaler to normalise display aspect ratio
 436                                         this->rect.w = frame_aspect / this_aspect * this->window_width + 0.5;
 437                                         this->rect.h = this->window_height;
 438                                         if ( this->rect.w > this->window_width )
 439                                         {
 440                                                 this->rect.w = this->window_width;
 441                                                 this->rect.h = this_aspect / frame_aspect * this->window_height + 0.5;
 442                                         }
 443                                 }
 444                         }
 445                         // Special case optimisation to negate odd effect of sample aspect ratio
 446                         // not corresponding exactly with image resolution.
 447                         else if ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) )
 448                         {
 449                                 this->rect.w = this->window_width;
 450                                 this->rect.h = this->window_height;
 451                         }
 452                         // Use hardware scaler to normalise sample aspect ratio
 453                         else if ( this->window_height * frame_aspect > this->window_width )
 454                         {
 455                                 this->rect.w = this->window_width;
 456                                 this->rect.h = this->window_width / frame_aspect + 0.5;
 457                         }
 458                         else
 459                         {
 460                                 this->rect.w = this->window_height * frame_aspect + 0.5;
 461                                 this->rect.h = this->window_height;
 462                         }
 463
 464                         this->rect.x = ( this->window_width - this->rect.w ) / 2;
 465                         this->rect.y = ( this->window_height - this->rect.h ) / 2;
 466
 467                         // Force an overlay recreation
 468                         if ( this->sdl_overlay != NULL )
 469                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 470
 471                         // open SDL window with video overlay, if possible
 472                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 473
 474                         if ( this->sdl_screen != NULL )
 475                         {
 476                                 SDL_SetClipRect( this->sdl_screen, &this->rect );
 477                                 sdl_lock_display();
 478                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width, this->height, SDL_YUY2_OVERLAY, this->sdl_screen );
 479                                 sdl_unlock_display();
 480                         }
 481                 }
 482
 483                 if ( mlt_properties_get_int( properties, "changed" ) )
 484                 {
 485                         sdl_lock_display();
 486                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 487                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 488                         SDL_Flip( this->sdl_screen );
 489                         sdl_unlock_display();
 490                         mlt_properties_set_int( properties, "changed", 0 );
 491                 }
 492
 493                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 494                 {
 495                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 496                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 497                         {
 498                                 if ( image != NULL )
 499                                         memcpy( this->buffer, image, width * height * 2 );
 500                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 501                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 502                         }
 503                 }
 504
 505         }
 506
 507         return 0;
 508 }
 509
 510 /** Threaded wrapper for pipe.
 511 */
 512
 513 static void *consumer_thread( void *arg )
 514 {
 515         // Identify the arg
 516         consumer_sdl this = arg;
 517
 518         // Get the consumer
 519         mlt_consumer consumer = &this->parent;
 520
 521         // internal intialization
 522         int init_audio = 1;
 523
 524         // Obtain time of thread start
 525         struct timeval now;
 526         int64_t start = 0;
 527         int64_t elapsed = 0;
 528         int duration = 0;
 529         int64_t playtime = 0;
 530         struct timespec tm;
 531         mlt_frame next = NULL;
 532         mlt_frame frame = NULL;
 533         mlt_properties properties = NULL;
 534
 535         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 536         {
 537                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 538                 return NULL;
 539         }
 540
 541         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 542         SDL_EnableUNICODE( 1 );
 543
 544         // Loop until told not to
 545         while( this->running )
 546         {
 547                 // Get a frame from the attached producer
 548                 frame = mlt_consumer_rt_frame( consumer );
 549
 550                 // Ensure that we have a frame
 551                 if ( frame != NULL )
 552                 {
 553                         // Get the frame properties
 554                         properties =  mlt_frame_properties( frame );
 555
 556                         // Play audio
 557                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 558
 559                         // Determine the start time now
 560                         if ( this->playing && start == 0 )
 561                         {
 562                                 // Get the current time
 563                                 gettimeofday( &now, NULL );
 564
 565                                 // Determine start time
 566                                 start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 567                         }
 568
 569                         // Set playtime for this frame
 570                         mlt_properties_set_position( properties, "playtime", playtime );
 571
 572                         // Push this frame to the back of the queue
 573                         mlt_deque_push_back( this->queue, frame );
 574
 575                         // Calculate the next playtime
 576                         playtime += ( duration * 1000 );
 577                 }
 578
 579                 // Pop the next frame
 580                 next = mlt_deque_pop_front( this->queue );
 581
 582                 while ( next != NULL && this->playing )
 583                 {
 584                         // Get the properties
 585                         properties =  mlt_frame_properties( next );
 586
 587                         // Get the current time
 588                         gettimeofday( &now, NULL );
 589
 590                         // Get the elapsed time
 591                         elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 592
 593                         // See if we have to delay the display of the current frame
 594                         if ( mlt_properties_get_int( properties, "rendered" ) == 1 )
 595                         {
 596                                 // Obtain the scheduled playout time
 597                                 mlt_position scheduled = mlt_properties_get_position( properties, "playtime" );
 598
 599                                 // Determine the difference between the elapsed time and the scheduled playout time
 600                                 mlt_position difference = scheduled - elapsed;
 601
 602                                 // If the frame is quite some way in the future, go get another
 603                                 if ( difference > 80000 && mlt_deque_count( this->queue ) < 6 )
 604                                         break;
 605
 606                                 // Smooth playback a bit
 607                                 if ( difference > 20000 && mlt_properties_get_double( properties, "_speed" ) == 1.0 )
 608                                 {
 609                                         tm.tv_sec = difference / 1000000;
 610                                         tm.tv_nsec = ( difference % 1000000 ) * 1000;
 611                                         nanosleep( &tm, NULL );
 612                                 }
 613
 614                                 // Show current frame if not too old
 615                                 if ( difference > -10000 || mlt_properties_get_double( properties, "_speed" ) != 1.0 )
 616                                         consumer_play_video( this, next );
 617                                 else
 618                                         start = start - difference;
 619                         }
 620
 621                         // This is an unrendered frame - just close it
 622                         mlt_frame_close( next );
 623
 624                         // Pop the next frame
 625                         next = mlt_deque_pop_front( this->queue );
 626                 }
 627
 628                 if ( next != NULL )
 629                         mlt_deque_push_front( this->queue, next );
 630         }
 631
 632         // internal cleanup
 633         if ( init_audio == 0 )
 634                 SDL_AudioQuit( );
 635         if ( this->sdl_overlay != NULL )
 636                 SDL_FreeYUVOverlay( this->sdl_overlay );
 637         SDL_Quit( );
 638
 639         while( mlt_deque_count( this->queue ) )
 640                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 641
 642         this->sdl_screen = NULL;
 643         this->sdl_overlay = NULL;
 644         this->audio_avail = 0;
 645
 646         return NULL;
 647 }
 648
 649 static int consumer_get_dimensions( int *width, int *height )
 650 {
 651         int changed = 0;
 652
 653         // SDL windows manager structure
 654         SDL_SysWMinfo wm;
 655
 656         // Specify the SDL Version
 657         SDL_VERSION( &wm.version );
 658
 659         // Get the wm structure
 660         if ( SDL_GetWMInfo( &wm ) == 1 )
 661         {
 662                 // Check that we have the X11 wm
 663                 if ( wm.subsystem == SDL_SYSWM_X11 )
 664                 {
 665                         // Get the SDL window
 666                         Window window = wm.info.x11.window;
 667
 668                         // Get the display session
 669                         Display *display = wm.info.x11.display;
 670
 671                         // Get the window attributes
 672                         XWindowAttributes attr;
 673                         XGetWindowAttributes( display, window, &attr );
 674
 675                         // Determine whether window has changed
 676                         changed = *width != attr.width || *height != attr.height;
 677
 678                         // Return width and height
 679                         *width = attr.width;
 680                         *height = attr.height;
 681                 }
 682         }
 683
 684         return changed;
 685 }
 686
 687 /** Callback to allow override of the close method.
 688 */
 689
 690 static void consumer_close( mlt_consumer parent )
 691 {
 692         // Get the actual object
 693         consumer_sdl this = parent->child;
 694
 695         // Stop the consumer
 696         mlt_consumer_stop( parent );
 697
 698         // Close the queue
 699         mlt_deque_close( this->queue );
 700
 701         // Destroy mutexes
 702         pthread_mutex_destroy( &this->audio_mutex );
 703         pthread_cond_destroy( &this->audio_cond );
 704
 705         // Now clean up the rest
 706         mlt_consumer_close( parent );
 707
 708         // Finally clean up this
 709         free( this );
 710 }