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, 2010 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.h>
  32 #include <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( 1, sizeof( struct consumer_sdl_s ) );
  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 + 0.5;
 167                 this->window_height = this->height;
 168
 169                 if ( sdl_started == 0 && preview_off == 0 )
 170                 {
 171                         pthread_mutex_lock( &mlt_sdl_mutex );
 172                         int ret = SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE );
 173                         pthread_mutex_unlock( &mlt_sdl_mutex );
 174                         if ( ret < 0 )
 175                         {
 176                                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 177                                 return -1;
 178                         }
 179
 180                         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 181                         SDL_EnableUNICODE( 1 );
 182                 }
 183                 else if ( preview_off == 0 )
 184                 {
 185                         pthread_mutex_lock( &mlt_sdl_mutex );
 186                         SDL_Surface *screen = SDL_GetVideoSurface( );
 187                         pthread_mutex_unlock( &mlt_sdl_mutex );
 188                         if ( screen != NULL )
 189                         {
 190                                 this->sdl_screen = screen;
 191                         }
 192                 }
 193
 194                 if ( this->sdl_screen == NULL && preview_off == 0 )
 195                 {
 196                         pthread_mutex_lock( &mlt_sdl_mutex );
 197                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 198                         pthread_mutex_unlock( &mlt_sdl_mutex );
 199                 }
 200
 201                 pthread_create( &this->thread, NULL, consumer_thread, this );
 202         }
 203
 204         return 0;
 205 }
 206
 207 static int consumer_stop( mlt_consumer parent )
 208 {
 209         // Get the actual object
 210         consumer_sdl this = parent->child;
 211
 212         if ( this->joined == 0 )
 213         {
 214                 int preview_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "preview_off" );
 215                 int sdl_started = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" );
 216
 217                 // Kill the thread and clean up
 218                 this->running = 0;
 219
 220                 pthread_join( this->thread, NULL );
 221                 this->joined = 1;
 222
 223                 if ( sdl_started == 0 && preview_off == 0 )
 224                 {
 225                         pthread_mutex_lock( &mlt_sdl_mutex );
 226                         SDL_Quit( );
 227                         pthread_mutex_unlock( &mlt_sdl_mutex );
 228                 }
 229
 230                 pthread_mutex_lock( &mlt_sdl_mutex );
 231                 this->sdl_screen = NULL;
 232                 pthread_mutex_unlock( &mlt_sdl_mutex );
 233         }
 234
 235         return 0;
 236 }
 237
 238 static int consumer_is_stopped( mlt_consumer parent )
 239 {
 240         consumer_sdl this = parent->child;
 241         return !this->running;
 242 }
 243
 244 static int sdl_lock_display( )
 245 {
 246         pthread_mutex_lock( &mlt_sdl_mutex );
 247         SDL_Surface *screen = SDL_GetVideoSurface( );
 248         int result = screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 249         pthread_mutex_unlock( &mlt_sdl_mutex );
 250         return result;
 251 }
 252
 253 static void sdl_unlock_display( )
 254 {
 255         pthread_mutex_lock( &mlt_sdl_mutex );
 256         SDL_Surface *screen = SDL_GetVideoSurface( );
 257         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 258                 SDL_UnlockSurface( screen );
 259         pthread_mutex_unlock( &mlt_sdl_mutex );
 260 }
 261
 262 static inline void display_1( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 263 {
 264         // Generate the affine transform scaling values
 265         if ( rect.w == 0 || rect.h == 0 ) return;
 266         int scale_width = ( width << 16 ) / rect.w;
 267         int scale_height = ( height << 16 ) / rect.h;
 268         int stride = width * 4;
 269         int x, y, row_index;
 270         uint8_t *q, *row;
 271
 272         // Constants defined for clarity and optimisation
 273         int scanlength = screen->pitch;
 274         uint8_t *start = ( uint8_t * )screen->pixels + rect.y * scanlength + rect.x;
 275         uint8_t *p;
 276
 277         // Iterate through the screen using a very basic scaling algorithm
 278         for ( y = 0; y < rect.h; y ++ )
 279         {
 280                 p = start;
 281                 row_index = ( 32768 + scale_height * y ) >> 16;
 282                 row = image + stride * row_index;
 283                 for ( x = 0; x < rect.w; x ++ )
 284                 {
 285                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 4 );
 286                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 287                 }
 288                 start += scanlength;
 289         }
 290 }
 291
 292 static inline void display_2( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 293 {
 294         // Generate the affine transform scaling values
 295         if ( rect.w == 0 || rect.h == 0 ) return;
 296         int scale_width = ( width << 16 ) / rect.w;
 297         int scale_height = ( height << 16 ) / rect.h;
 298         int stride = width * 4;
 299         int x, y, row_index;
 300         uint8_t *q, *row;
 301
 302         // Constants defined for clarity and optimisation
 303         int scanlength = screen->pitch / 2;
 304         uint16_t *start = ( uint16_t * )screen->pixels + rect.y * scanlength + rect.x;
 305         uint16_t *p;
 306
 307         // Iterate through the screen using a very basic scaling algorithm
 308         for ( y = 0; y < rect.h; y ++ )
 309         {
 310                 p = start;
 311                 row_index = ( 32768 + scale_height * y ) >> 16;
 312                 row = image + stride * row_index;
 313                 for ( x = 0; x < rect.w; x ++ )
 314                 {
 315                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 4 );
 316                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 317                 }
 318                 start += scanlength;
 319         }
 320 }
 321
 322 static inline void display_3( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 323 {
 324         // Generate the affine transform scaling values
 325         if ( rect.w == 0 || rect.h == 0 ) return;
 326         int scale_width = ( width << 16 ) / rect.w;
 327         int scale_height = ( height << 16 ) / rect.h;
 328         int stride = width * 4;
 329         int x, y, row_index;
 330         uint8_t *q, *row;
 331
 332         // Constants defined for clarity and optimisation
 333         int scanlength = screen->pitch;
 334         uint8_t *start = ( uint8_t * )screen->pixels + rect.y * scanlength + rect.x;
 335         uint8_t *p;
 336         uint32_t pixel;
 337
 338         // Iterate through the screen using a very basic scaling algorithm
 339         for ( y = 0; y < rect.h; y ++ )
 340         {
 341                 p = start;
 342                 row_index = ( 32768 + scale_height * y ) >> 16;
 343                 row = image + stride * row_index;
 344                 for ( x = 0; x < rect.w; x ++ )
 345                 {
 346                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 4 );
 347                         pixel = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 348                         *p ++ = (pixel & 0xFF0000) >> 16;
 349                         *p ++ = (pixel & 0x00FF00) >> 8;
 350                         *p ++ = (pixel & 0x0000FF);
 351                 }
 352                 start += scanlength;
 353         }
 354 }
 355
 356 static inline void display_4( SDL_Surface *screen, SDL_Rect rect, uint8_t *image, int width, int height )
 357 {
 358         // Generate the affine transform scaling values
 359         if ( rect.w == 0 || rect.h == 0 ) return;
 360         int scale_width = ( width << 16 ) / rect.w;
 361         int scale_height = ( height << 16 ) / rect.h;
 362         int stride = width * 4;
 363         int x, y, row_index;
 364         uint8_t *q, *row;
 365
 366         // Constants defined for clarity and optimisation
 367         int scanlength = screen->pitch / 4;
 368         uint32_t *start = ( uint32_t * )screen->pixels + rect.y * scanlength + rect.x;
 369         uint32_t *p;
 370
 371         // Iterate through the screen using a very basic scaling algorithm
 372         for ( y = 0; y < rect.h; y ++ )
 373         {
 374                 p = start;
 375                 row_index = ( 32768 + scale_height * y ) >> 16;
 376                 row = image + stride * row_index;
 377                 for ( x = 0; x < rect.w; x ++ )
 378                 {
 379                         q = row + ( ( ( 32768 + scale_width * x ) >> 16 ) * 4 );
 380                         *p ++ = SDL_MapRGB( screen->format, *q, *( q + 1 ), *( q + 2 ) );
 381                 }
 382                 start += scanlength;
 383         }
 384 }
 385
 386 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 387 {
 388         // Get the properties of this consumer
 389         mlt_properties properties = this->properties;
 390
 391         mlt_image_format vfmt = mlt_image_rgb24a;
 392         int height = this->height;
 393         int width = this->width;
 394         uint8_t *image = NULL;
 395         int changed = 0;
 396         double display_ratio = mlt_properties_get_double( this->properties, "display_ratio" );
 397
 398         void ( *lock )( void ) = mlt_properties_get_data( properties, "app_lock", NULL );
 399         void ( *unlock )( void ) = mlt_properties_get_data( properties, "app_unlock", NULL );
 400
 401         if ( lock != NULL ) lock( );
 402         void *pool = mlt_cocoa_autorelease_init();
 403         sdl_lock_display();
 404
 405         // Handle events
 406         if ( this->sdl_screen != NULL )
 407         {
 408                 SDL_Event event;
 409
 410                 pthread_mutex_lock( &mlt_sdl_mutex );
 411                 changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 412                 pthread_mutex_unlock( &mlt_sdl_mutex );
 413
 414                 while ( SDL_PollEvent( &event ) )
 415                 {
 416                         mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 417
 418                         switch( event.type )
 419                         {
 420                                 case SDL_VIDEORESIZE:
 421                                         this->window_width = event.resize.w;
 422                                         this->window_height = event.resize.h;
 423                                         changed = 1;
 424                                         break;
 425                                 case SDL_QUIT:
 426                                         this->running = 0;
 427                                         break;
 428                                 case SDL_KEYDOWN:
 429                                         {
 430                                                 mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 431                                                 char keyboard[ 2 ] = " ";
 432                                                 void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 433                                                 if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 434                                                 {
 435                                                         keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 436                                                         callback( producer, keyboard );
 437                                                 }
 438                                         }
 439                                         break;
 440                         }
 441                 }
 442         }
 443
 444         if ( this->sdl_screen == NULL || changed )
 445         {
 446                 // open SDL window
 447                 pthread_mutex_lock( &mlt_sdl_mutex );
 448                 this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 449                 if ( consumer_get_dimensions( &this->window_width, &this->window_height ) )
 450                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 451
 452                 uint32_t color = mlt_properties_get_int( this->properties, "window_background" );
 453                 if ( this->sdl_screen )
 454                 {
 455                         SDL_FillRect( this->sdl_screen, NULL, color >> 8 );
 456                         changed = 1;
 457                 }
 458                 pthread_mutex_unlock( &mlt_sdl_mutex );
 459         }
 460         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "test_audio", 1 );
 461         if ( changed == 0 &&
 462                  this->last_position == mlt_frame_get_position( frame ) &&
 463                  this->last_producer == mlt_frame_get_original_producer( frame ) &&
 464                  !mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "refresh" ) )
 465         {
 466                 sdl_unlock_display( );
 467                 mlt_cocoa_autorelease_close( pool );
 468                 if ( unlock != NULL ) unlock( );
 469                 struct timespec tm = { 0, 100000 };
 470                 nanosleep( &tm, NULL );
 471                 return 0;
 472         }
 473
 474         // Update last frame shown info
 475         this->last_position = mlt_frame_get_position( frame );
 476         this->last_producer = mlt_frame_get_original_producer( frame );
 477
 478         // Get the image, width and height
 479         mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 480
 481         if ( image != NULL )
 482         {
 483                 char *rescale = mlt_properties_get( properties, "rescale" );
 484                 if ( rescale != NULL && strcmp( rescale, "none" ) )
 485                 {
 486                         double this_aspect = display_ratio / ( ( double )this->window_width / ( double )this->window_height );
 487                         this->rect.w = this_aspect * this->window_width;
 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 / this_aspect ) * this->window_height;
 493                         }
 494                 }
 495                 else
 496                 {
 497                         double frame_aspect = mlt_frame_get_aspect_ratio( frame ) * width / height;
 498                         this->rect.w = frame_aspect * this->window_height;
 499                         this->rect.h = this->window_height;
 500                         if ( this->rect.w > this->window_width )
 501                         {
 502                                 this->rect.w = this->window_width;
 503                                 this->rect.h = ( 1.0 / frame_aspect ) * this->window_width;
 504                         }
 505                 }
 506
 507                 this->rect.x = ( this->window_width - this->rect.w ) / 2;
 508                 this->rect.y = ( this->window_height - this->rect.h ) / 2;
 509
 510                 mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 511                 mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 512                 mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 513                 mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 514         }
 515
 516         pthread_mutex_lock( &mlt_sdl_mutex );
 517         SDL_Surface *screen = SDL_GetVideoSurface( );
 518         if ( !mlt_consumer_is_stopped( &this->parent ) && screen != NULL && this->sdl_screen != NULL && this->sdl_screen->pixels != NULL )
 519         {
 520                 switch( this->sdl_screen->format->BytesPerPixel )
 521                 {
 522                         case 1:
 523                                 display_1( this->sdl_screen, this->rect, image, width, height );
 524                                 break;
 525                         case 2:
 526                                 display_2( this->sdl_screen, this->rect, image, width, height );
 527                                 break;
 528                         case 3:
 529                                 display_3( this->sdl_screen, this->rect, image, width, height );
 530                                 break;
 531                         case 4:
 532                                 display_4( this->sdl_screen, this->rect, image, width, height );
 533                                 break;
 534                         default:
 535                                 fprintf( stderr, "Unsupported video depth %d\n", this->sdl_screen->format->BytesPerPixel );
 536                                 break;
 537                 }
 538
 539                 // Flip it into sight
 540                 SDL_Flip( this->sdl_screen );
 541         }
 542         pthread_mutex_unlock( &mlt_sdl_mutex );
 543
 544         sdl_unlock_display();
 545         mlt_cocoa_autorelease_close( pool );
 546         if ( unlock != NULL ) unlock( );
 547         mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 548
 549         return 1;
 550 }
 551
 552 /** Threaded wrapper for pipe.
 553 */
 554
 555 static void *consumer_thread( void *arg )
 556 {
 557         // Identify the arg
 558         consumer_sdl this = arg;
 559
 560         // Get the consumer
 561         mlt_consumer consumer = &this->parent;
 562         mlt_properties properties = MLT_CONSUMER_PROPERTIES( consumer );
 563         mlt_frame frame = NULL;
 564
 565         // Allow the hosting app to provide the preview
 566         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 567
 568         // Loop until told not to
 569         while( this->running )
 570         {
 571                 // Get a frame from the attached producer
 572                 frame = mlt_consumer_rt_frame( consumer );
 573
 574                 // Ensure that we have a frame
 575                 if ( this->running && frame != NULL )
 576                 {
 577                         if ( preview_off == 0 )
 578                         {
 579                                 consumer_play_video( this, frame );
 580                         }
 581                         else
 582                         {
 583                                 mlt_image_format vfmt = mlt_image_rgb24a;
 584                                 int height = this->height;
 585                                 int width = this->width;
 586                                 uint8_t *image = NULL;
 587                                 mlt_image_format preview_format = mlt_properties_get_int( properties, "preview_format" );
 588
 589                                 // Check if a specific colour space has been requested
 590                                 if ( preview_off && preview_format != mlt_image_none )
 591                                         vfmt = preview_format;
 592
 593                                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 594                                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 595                                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 596                         }
 597                         mlt_frame_close( frame );
 598                 }
 599                 else
 600                 {
 601                         if ( frame ) mlt_frame_close( frame );
 602                         this->running = 0;
 603                 }
 604         }
 605
 606         return NULL;
 607 }
 608
 609 static int consumer_get_dimensions( int *width, int *height )
 610 {
 611         int changed = 0;
 612
 613         // SDL windows manager structure
 614         SDL_SysWMinfo wm;
 615
 616         // Specify the SDL Version
 617         SDL_VERSION( &wm.version );
 618
 619 #ifndef __DARWIN__
 620         // Get the wm structure
 621         if ( SDL_GetWMInfo( &wm ) == 1 )
 622         {
 623 #ifndef WIN32
 624                 // Check that we have the X11 wm
 625                 if ( wm.subsystem == SDL_SYSWM_X11 )
 626                 {
 627                         // Get the SDL window
 628                         Window window = wm.info.x11.window;
 629
 630                         // Get the display session
 631                         Display *display = wm.info.x11.display;
 632
 633                         // Get the window attributes
 634                         XWindowAttributes attr;
 635                         XGetWindowAttributes( display, window, &attr );
 636
 637                         // Determine whether window has changed
 638                         changed = *width != attr.width || *height != attr.height;
 639
 640                         // Return width and height
 641                         *width = attr.width;
 642                         *height = attr.height;
 643                 }
 644 #endif
 645         }
 646 #endif
 647
 648         return changed;
 649 }
 650
 651 /** Callback to allow override of the close method.
 652 */
 653
 654 static void consumer_close( mlt_consumer parent )
 655 {
 656         // Get the actual object
 657         consumer_sdl this = parent->child;
 658
 659         // Stop the consumer
 660         mlt_consumer_stop( parent );
 661
 662         // Now clean up the rest
 663         mlt_consumer_close( parent );
 664
 665         // Finally clean up this
 666         free( this );
 667 }