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

   1 /*
   2  * consumer_sdl_still.c -- A Simple DirectMedia Layer consumer
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates
   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/SDL.h>
  32 #include <SDL/SDL_syswm.h>
  33 #include <sys/time.h>
  34 #include "consumer_sdl_osx.h"
  35
  36 extern pthread_mutex_t mlt_sdl_mutex;
  37
  38 /** This classes definition.
  39 */
  40
  41 typedef struct consumer_sdl_s *consumer_sdl;
  42
  43 struct consumer_sdl_s
  44 {
  45         struct mlt_consumer_s parent;
  46         mlt_properties properties;
  47         pthread_t thread;
  48         int joined;
  49         int running;
  50         int window_width;
  51         int window_height;
  52         int width;
  53         int height;
  54         int playing;
  55         int sdl_flags;
  56         SDL_Surface *sdl_screen;
  57         SDL_Rect rect;
  58         uint8_t *buffer;
  59         int last_position;
  60         mlt_producer last_producer;
  61 };
  62
  63 /** Forward references to static functions.
  64 */
  65
  66 static int consumer_start( mlt_consumer parent );
  67 static int consumer_stop( mlt_consumer parent );
  68 static int consumer_is_stopped( mlt_consumer parent );
  69 static void consumer_close( mlt_consumer parent );
  70 static void *consumer_thread( void * );
  71 static int consumer_get_dimensions( int *width, int *height );
  72 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  73
  74 /** This is what will be called by the factory - anything can be passed in
  75         via the argument, but keep it simple.
  76 */
  77
  78 mlt_consumer consumer_sdl_still_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  79 {
  80         // Create the consumer object
  81         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  82
  83         // If no malloc'd and consumer init ok
  84         if ( this != NULL && mlt_consumer_init( &this->parent, this, profile ) == 0 )
  85         {
  86                 // Get the parent consumer object
  87                 mlt_consumer parent = &this->parent;
  88
  89                 // get a handle on properties
  90                 mlt_service service = MLT_CONSUMER_SERVICE( parent );
  91                 this->properties = MLT_SERVICE_PROPERTIES( service );
  92
  93                 // We have stuff to clean up, so override the close method
  94                 parent->close = consumer_close;
  95
  96                 // Default scaler (for now we'll use nearest)
  97                 mlt_properties_set( this->properties, "rescale", "nearest" );
  98
  99                 // We're always going to run this in non-realtime mode
 100                 mlt_properties_set( this->properties, "real_time", "0" );
 101
 102                 // Ensure we don't join on a non-running object
 103                 this->joined = 1;
 104
 105                 // process actual param
 106                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 107                 {
 108                         this->width = mlt_properties_get_int( this->properties, "width" );
 109                         this->height = mlt_properties_get_int( this->properties, "height" );
 110                 }
 111                 else
 112                 {
 113                         mlt_properties_set_int( this->properties, "width", this->width );
 114                         mlt_properties_set_int( this->properties, "height", this->height );
 115                 }
 116
 117                 // Set the sdl flags
 118                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 119
 120                 // Allow thread to be started/stopped
 121                 parent->start = consumer_start;
 122                 parent->stop = consumer_stop;
 123                 parent->is_stopped = consumer_is_stopped;
 124
 125                 // Register specific events
 126                 mlt_events_register( this->properties, "consumer-sdl-event", ( mlt_transmitter )consumer_sdl_event );
 127
 128                 // Return the consumer produced
 129                 return parent;
 130         }
 131
 132         // malloc or consumer init failed
 133         free( this );
 134
 135         // Indicate failure
 136         return NULL;
 137 }
 138
 139 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 140 {
 141         if ( listener != NULL )
 142                 listener( owner, this, ( SDL_Event * )args[ 0 ] );
 143 }
 144
 145 static int consumer_start( mlt_consumer parent )
 146 {
 147         consumer_sdl this = parent->child;
 148
 149         if ( !this->running )
 150         {
 151                 int preview_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "preview_off" );
 152                 int sdl_started = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" );
 153
 154                 consumer_stop( parent );
 155
 156                 this->last_position = -1;
 157                 this->running = 1;
 158                 this->joined = 0;
 159
 160                 // Allow the user to force resizing to window size
 161                 this->width = mlt_properties_get_int( this->properties, "width" );
 162                 this->height = mlt_properties_get_int( this->properties, "height" );
 163
 164                 // Default window size
 165                 double display_ratio = mlt_properties_get_double( this->properties, "display_ratio" );
 166                 this->window_width = ( double )this->height * display_ratio;
 167                 this->window_height = this->height;
 168
 169                 if ( sdl_started == 0 && preview_off == 0 )
 170                 {
 171                         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 172                         {
 173                                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 174                                 return -1;
 175                         }
 176
 177                         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 178                         SDL_EnableUNICODE( 1 );
 179                 }
 180                 else if ( preview_off == 0 )
 181                 {
 182                         if ( SDL_GetVideoSurface( ) != NULL )
 183                         {
 184                                 this->sdl_screen = SDL_GetVideoSurface( );
 185                         }
 186                 }
 187
 188                 if ( this->sdl_screen == NULL && preview_off == 0 )
 189                 {
 190                         pthread_mutex_lock( &mlt_sdl_mutex );
 191                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 192                         pthread_mutex_unlock( &mlt_sdl_mutex );
 193                 }
 194
 195                 pthread_create( &this->thread, NULL, consumer_thread, this );
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int consumer_stop( mlt_consumer parent )
 202 {
 203         // Get the actual object
 204         consumer_sdl this = parent->child;
 205
 206         if ( this->joined == 0 )
 207         {
 208                 int preview_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "preview_off" );
 209                 int sdl_started = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" );
 210
 211                 // Kill the thread and clean up
 212                 this->running = 0;
 213
 214                 pthread_join( this->thread, NULL );
 215                 this->joined = 1;
 216
 217                 if ( sdl_started == 0 && preview_off == 0 )
 218                 {
 219                         pthread_mutex_lock( &mlt_sdl_mutex );
 220                         SDL_Quit( );
 221                         pthread_mutex_unlock( &mlt_sdl_mutex );
 222                 }
 223
 224                 this->sdl_screen = NULL;
 225         }
 226
 227         return 0;
 228 }
 229
 230 static int consumer_is_stopped( mlt_consumer parent )
 231 {
 232         consumer_sdl this = parent->child;
 233         return !this->running;
 234 }
 235
 236 static int sdl_lock_display( )
 237 {
 238         pthread_mutex_lock( &mlt_sdl_mutex );
 239         SDL_Surface *screen = SDL_GetVideoSurface( );
 240         int result = screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 241         pthread_mutex_unlock( &mlt_sdl_mutex );
 242         return result;
 243 }
 244
 245 static void sdl_unlock_display( )
 246 {
 247         pthread_mutex_lock( &mlt_sdl_mutex );
 248         SDL_Surface *screen = SDL_GetVideoSurface( );
 249         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 250                 SDL_UnlockSurface( screen );
 251         pthread_mutex_unlock( &mlt_sdl_mutex );
 252 }
 253
 254 static inline void display_1( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 255 {
 256         // Generate the affine transform scaling values
 257         if ( rect.w == 0 || rect.h == 0 ) return;
 258         int scale_width = ( width << 16 ) / rect.w;
 259         int scale_height = ( height << 16 ) / rect.h;
 260         int stride = width * 3;
 261         int x, y, row_index;
 262         uint8_t *q, *row;
 263
 264         // Constants defined for clarity and optimisation
 265         int scanlength = screen->pitch;
 266         uint8_t *start = ( uint8_t * )screen->pixels + rect.y * scanlength + rect.x;
 267         uint8_t *p;
 268
 269         // Iterate through the screen using a very basic scaling algorithm
 270         for ( y = 0; y < rect.h; y ++ )
 271         {
 272                 p = start;
 273                 row_index = ( 32768 + scale_height * y ) >> 16;
 274                 row = image + stride * row_index;
 275                 for ( x = 0; x < rect.w; x ++ )
 276                 {
 277                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 3 );
 278                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 279                 }
 280                 start += scanlength;
 281         }
 282 }
 283
 284 static inline void display_2( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 285 {
 286         // Generate the affine transform scaling values
 287         if ( rect.w == 0 || rect.h == 0 ) return;
 288         int scale_width = ( width << 16 ) / rect.w;
 289         int scale_height = ( height << 16 ) / rect.h;
 290         int stride = width * 3;
 291         int x, y, row_index;
 292         uint8_t *q, *row;
 293
 294         // Constants defined for clarity and optimisation
 295         int scanlength = screen->pitch / 2;
 296         uint16_t *start = ( uint16_t * )screen->pixels + rect.y * scanlength + rect.x;
 297         uint16_t *p;
 298
 299         // Iterate through the screen using a very basic scaling algorithm
 300         for ( y = 0; y < rect.h; y ++ )
 301         {
 302                 p = start;
 303                 row_index = ( 32768 + scale_height * y ) >> 16;
 304                 row = image + stride * row_index;
 305                 for ( x = 0; x < rect.w; x ++ )
 306                 {
 307                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 3 );
 308                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 309                 }
 310                 start += scanlength;
 311         }
 312 }
 313
 314 static inline void display_3( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 315 {
 316         // Generate the affine transform scaling values
 317         if ( rect.w == 0 || rect.h == 0 ) return;
 318         int scale_width = ( width << 16 ) / rect.w;
 319         int scale_height = ( height << 16 ) / rect.h;
 320         int stride = width * 3;
 321         int x, y, row_index;
 322         uint8_t *q, *row;
 323
 324         // Constants defined for clarity and optimisation
 325         int scanlength = screen->pitch;
 326         uint8_t *start = ( uint8_t * )screen->pixels + rect.y * scanlength + rect.x;
 327         uint8_t *p;
 328         uint32_t pixel;
 329
 330         // Iterate through the screen using a very basic scaling algorithm
 331         for ( y = 0; y < rect.h; y ++ )
 332         {
 333                 p = start;
 334                 row_index = ( 32768 + scale_height * y ) >> 16;
 335                 row = image + stride * row_index;
 336                 for ( x = 0; x < rect.w; x ++ )
 337                 {
 338                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 3 );
 339                         pixel = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 340                         *p ++ = (pixel & 0xFF0000) >> 16;
 341                         *p ++ = (pixel & 0x00FF00) >> 8;
 342                         *p ++ = (pixel & 0x0000FF);
 343                 }
 344                 start += scanlength;
 345         }
 346 }
 347
 348 static inline void display_4( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 349 {
 350         // Generate the affine transform scaling values
 351         if ( rect.w == 0 || rect.h == 0 ) return;
 352         int scale_width = ( width << 16 ) / rect.w;
 353         int scale_height = ( height << 16 ) / rect.h;
 354         int stride = width * 3;
 355         int x, y, row_index;
 356         uint8_t *q, *row;
 357
 358         // Constants defined for clarity and optimisation
 359         int scanlength = screen->pitch / 4;
 360         uint32_t *start = ( uint32_t * )screen->pixels + rect.y * scanlength + rect.x;
 361         uint32_t *p;
 362
 363         // Iterate through the screen using a very basic scaling algorithm
 364         for ( y = 0; y < rect.h; y ++ )
 365         {
 366                 p = start;
 367                 row_index = ( 32768 + scale_height * y ) >> 16;
 368                 row = image + stride * row_index;
 369                 for ( x = 0; x < rect.w; x ++ )
 370                 {
 371                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 3 );
 372                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 373                 }
 374                 start += scanlength;
 375         }
 376 }
 377
 378 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 379 {
 380         // Get the properties of this consumer
 381         mlt_properties properties = this->properties;
 382
 383         mlt_image_format vfmt = mlt_image_rgb24;
 384         int height = this->height;
 385         int width = this->width;
 386         uint8_t *image = NULL;
 387         int changed = 0;
 388         double display_ratio = mlt_properties_get_double( this->properties, "display_ratio" );
 389
 390         void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 391         void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 392
 393         if ( lock != NULL ) lock( );
 394         void *pool = mlt_cocoa_autorelease_init();
 395         sdl_lock_display();
 396
 397         // Handle events
 398         if ( this->sdl_screen != NULL )
 399         {
 400                 SDL_Event event;
 401
 402                 pthread_mutex_lock( &mlt_sdl_mutex );
 403                 changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 404                 pthread_mutex_unlock( &mlt_sdl_mutex );
 405
 406                 while ( SDL_PollEvent( &event ) )
 407                 {
 408                         mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 409
 410                         switch( event.type )
 411                         {
 412                                 case SDL_VIDEORESIZE:
 413                                         this->window_width = event.resize.w;
 414                                         this->window_height = event.resize.h;
 415                                         changed = 1;
 416                                         break;
 417                                 case SDL_QUIT:
 418                                         this->running = 0;
 419                                         break;
 420                                 case SDL_KEYDOWN:
 421                                         {
 422                                                 mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 423                                                 char keyboard[ 2 ] = " ";
 424                                                 void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 425                                                 if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 426                                                 {
 427                                                         keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 428                                                         callback( producer, keyboard );
 429                                                 }
 430                                         }
 431                                         break;
 432                         }
 433                 }
 434         }
 435
 436         if ( this->sdl_screen == NULL || changed )
 437         {
 438                 // open SDL window
 439                 pthread_mutex_lock( &mlt_sdl_mutex );
 440                 this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 441                 if ( consumer_get_dimensions( &this->window_width, &this->window_height ) )
 442                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 443                 pthread_mutex_unlock( &mlt_sdl_mutex );
 444
 445                 uint32_t color = mlt_properties_get_int( this->properties, "window_background" );
 446                 SDL_FillRect( this->sdl_screen, NULL, color >> 8 );
 447                 changed = 1;
 448         }
 449
 450         if ( changed == 0 &&
 451                  this->last_position == mlt_frame_get_position( frame ) &&
 452                  this->last_producer == mlt_frame_get_original_producer( frame ) &&
 453                  !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "refresh" ) )
 454         {
 455                 sdl_unlock_display( );
 456                 mlt_cocoa_autorelease_close( pool );
 457                 if ( unlock != NULL ) unlock( );
 458                 struct timespec tm = { 0, 100000 };
 459                 nanosleep( &tm, NULL );
 460                 return 0;
 461         }
 462
 463         // Update last frame shown info
 464         this->last_position = mlt_frame_get_position( frame );
 465         this->last_producer = mlt_frame_get_original_producer( frame );
 466
 467         // Get the image, width and height
 468         mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 469
 470         if ( image != NULL )
 471         {
 472                 char *rescale = mlt_properties_get( properties, "rescale" );
 473                 if ( rescale != NULL && strcmp( rescale, "none" ) )
 474                 {
 475                         double this_aspect = display_ratio / ( ( double )this->window_width / ( double )this->window_height );
 476                         this->rect.w = this_aspect * this->window_width;
 477                         this->rect.h = this->window_height;
 478                         if ( this->rect.w > this->window_width )
 479                         {
 480                                 this->rect.w = this->window_width;
 481                                 this->rect.h = ( 1.0 / this_aspect ) * this->window_height;
 482                         }
 483                 }
 484                 else
 485                 {
 486                         double frame_aspect = mlt_frame_get_aspect_ratio( frame ) * width / height;
 487                         this->rect.w = frame_aspect * this->window_height;
 488                         this->rect.h = this->window_height;
 489                         if ( this->rect.w > this->window_width )
 490                         {
 491                                 this->rect.w = this->window_width;
 492                                 this->rect.h = ( 1.0 / frame_aspect ) * this->window_width;
 493                         }
 494                 }
 495
 496                 this->rect.x = ( this->window_width - this->rect.w ) / 2;
 497                 this->rect.y = ( this->window_height - this->rect.h ) / 2;
 498
 499                 mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 500                 mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 501                 mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 502                 mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 503         }
 504
 505         if ( !mlt_consumer_is_stopped( &this->parent ) && SDL_GetVideoSurface( ) != NULL && this->sdl_screen != NULL && this->sdl_screen->pixels != NULL )
 506         {
 507                 switch( this->sdl_screen->format->BytesPerPixel )
 508                 {
 509                         case 1:
 510                                 display_1( this->sdl_screen, this->rect, image, width, height );
 511                                 break;
 512                         case 2:
 513                                 display_2( this->sdl_screen, this->rect, image, width, height );
 514                                 break;
 515                         case 3:
 516                                 display_3( this->sdl_screen, this->rect, image, width, height );
 517                                 break;
 518                         case 4:
 519                                 display_4( this->sdl_screen, this->rect, image, width, height );
 520                                 break;
 521                         default:
 522                                 fprintf( stderr, "Unsupported video depth %d\n", this->sdl_screen->format->BytesPerPixel );
 523                                 break;
 524                 }
 525
 526                 // Flip it into sight
 527                 pthread_mutex_lock( &mlt_sdl_mutex );
 528                 SDL_Flip( this->sdl_screen );
 529                 pthread_mutex_unlock( &mlt_sdl_mutex );
 530         }
 531
 532         sdl_unlock_display();
 533         mlt_cocoa_autorelease_close( pool );
 534         if ( unlock != NULL ) unlock( );
 535         mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 536
 537         return 1;
 538 }
 539
 540 /** Threaded wrapper for pipe.
 541 */
 542
 543 static void *consumer_thread( void *arg )
 544 {
 545         // Identify the arg
 546         consumer_sdl this = arg;
 547
 548         // Get the consumer
 549         mlt_consumer consumer = &this->parent;
 550         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 551         mlt_frame frame = NULL;
 552
 553         // Allow the hosting app to provide the preview
 554         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 555
 556         // Loop until told not to
 557         while( this->running )
 558         {
 559                 // Get a frame from the attached producer
 560                 frame = mlt_consumer_rt_frame( consumer );
 561
 562                 // Ensure that we have a frame
 563                 if ( this->running && frame != NULL )
 564                 {
 565                         if ( preview_off == 0 )
 566                         {
 567                                 consumer_play_video( this, frame );
 568                         }
 569                         else
 570                         {
 571                                 mlt_image_format vfmt = mlt_image_rgb24a;
 572                                 int height = this->height;
 573                                 int width = this->width;
 574                                 uint8_t *image = NULL;
 575                                 mlt_image_format preview_format = mlt_properties_get_int( properties, "preview_format" );
 576
 577                                 // Check if a specific colour space has been requested
 578                                 if ( preview_off && preview_format != mlt_image_none )
 579                                         vfmt = preview_format;
 580
 581                                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 582                                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 583                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 584                         }
 585                         mlt_frame_close( frame );
 586                 }
 587                 else
 588                 {
 589                         if ( frame ) mlt_frame_close( frame );
 590                         this->running = 0;
 591                 }
 592         }
 593
 594         return NULL;
 595 }
 596
 597 static int consumer_get_dimensions( int *width, int *height )
 598 {
 599         int changed = 0;
 600
 601         // SDL windows manager structure
 602         SDL_SysWMinfo wm;
 603
 604         // Specify the SDL Version
 605         SDL_VERSION( &wm.version );
 606
 607         // Get the wm structure
 608         if ( SDL_GetWMInfo( &wm ) == 1 )
 609         {
 610 #ifndef __DARWIN__
 611                 // Check that we have the X11 wm
 612                 if ( wm.subsystem == SDL_SYSWM_X11 )
 613                 {
 614                         // Get the SDL window
 615                         Window window = wm.info.x11.window;
 616
 617                         // Get the display session
 618                         Display *display = wm.info.x11.display;
 619
 620                         // Get the window attributes
 621                         XWindowAttributes attr;
 622                         XGetWindowAttributes( display, window, &attr );
 623
 624                         // Determine whether window has changed
 625                         changed = *width != attr.width || *height != attr.height;
 626
 627                         // Return width and height
 628                         *width = attr.width;
 629                         *height = attr.height;
 630                 }
 631 #endif
 632         }
 633
 634         return changed;
 635 }
 636
 637 /** Callback to allow override of the close method.
 638 */
 639
 640 static void consumer_close( mlt_consumer parent )
 641 {
 642         // Get the actual object
 643         consumer_sdl this = parent->child;
 644
 645         // Stop the consumer
 646         mlt_consumer_stop( parent );
 647
 648         // Now clean up the rest
 649         mlt_consumer_close( parent );
 650
 651         // Finally clean up this
 652         free( this );
 653 }