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 joined;
  44         int running;
  45         uint8_t audio_buffer[ 4096 * 10 ];
  46         int audio_avail;
  47         pthread_mutex_t audio_mutex;
  48         pthread_cond_t audio_cond;
  49         pthread_mutex_t video_mutex;
  50         pthread_cond_t video_cond;
  51         int window_width;
  52         int window_height;
  53         float aspect_ratio;
  54         float display_aspect;
  55         double last_frame_aspect;
  56         int width;
  57         int height;
  58         int playing;
  59         int sdl_flags;
  60         SDL_Surface *sdl_screen;
  61         SDL_Overlay *sdl_overlay;
  62         SDL_Rect rect;
  63         uint8_t *buffer;
  64 };
  65
  66 /** Forward references to static functions.
  67 */
  68
  69 static int consumer_start( mlt_consumer parent );
  70 static int consumer_stop( mlt_consumer parent );
  71 static int consumer_is_stopped( mlt_consumer parent );
  72 static void consumer_close( mlt_consumer parent );
  73 static void *consumer_thread( void * );
  74 static int consumer_get_dimensions( int *width, int *height );
  75 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  76
  77 /** This is what will be called by the factory - anything can be passed in
  78         via the argument, but keep it simple.
  79 */
  80
  81 mlt_consumer consumer_sdl_init( char *arg )
  82 {
  83         // Create the consumer object
  84         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  85
  86         // If no malloc'd and consumer init ok
  87         if ( this != NULL && mlt_consumer_init( &this->parent, this ) == 0 )
  88         {
  89                 // Create the queue
  90                 this->queue = mlt_deque_init( );
  91
  92                 // Get the parent consumer object
  93                 mlt_consumer parent = &this->parent;
  94
  95                 // We have stuff to clean up, so override the close method
  96                 parent->close = consumer_close;
  97
  98                 // get a handle on properties
  99                 mlt_service service = mlt_consumer_service( parent );
 100                 this->properties = mlt_service_properties( service );
 101
 102                 // Set the default volume
 103                 mlt_properties_set_double( this->properties, "volume", 1.0 );
 104
 105                 // This is the initialisation of the consumer
 106                 pthread_mutex_init( &this->audio_mutex, NULL );
 107                 pthread_cond_init( &this->audio_cond, NULL);
 108                 pthread_mutex_init( &this->video_mutex, NULL );
 109                 pthread_cond_init( &this->video_cond, NULL);
 110
 111                 // Default scaler (for now we'll use nearest)
 112                 mlt_properties_set( this->properties, "rescale", "nearest" );
 113
 114                 // Default buffer for low latency
 115                 mlt_properties_set_int( this->properties, "buffer", 1 );
 116
 117                 // Default progressive true
 118                 mlt_properties_set_int( this->properties, "progressive", 0 );
 119
 120                 // Default audio buffer
 121                 mlt_properties_set_int( this->properties, "audio_buffer", 1024 );
 122
 123                 // Get sample aspect ratio
 124                 this->aspect_ratio = mlt_properties_get_double( this->properties, "aspect_ratio" );
 125
 126                 // Ensure we don't join on a non-running object
 127                 this->joined = 1;
 128
 129                 // Default display aspect ratio
 130                 this->display_aspect = 4.0 / 3.0;
 131
 132                 // process actual param
 133                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 134                 {
 135                         this->width = mlt_properties_get_int( this->properties, "width" );
 136                         this->height = mlt_properties_get_int( this->properties, "height" );
 137
 138                         // Default window size
 139                         this->window_width = ( float )this->height * this->display_aspect;
 140                         this->window_height = this->height;
 141                 }
 142                 else
 143                 {
 144                         if ( (int)( ( float )this->width / this->height * 1000 ) !=
 145                                  (int)( this->display_aspect * 1000 ) )
 146                         {
 147                                 // Override these
 148                                 this->display_aspect = ( float )this->width / this->height;
 149                                 this->aspect_ratio = 1.0;
 150                                 mlt_properties_set_double( this->properties, "aspect_ratio", this->aspect_ratio );
 151                         }
 152
 153                         // Set window size
 154                         this->window_width = this->width;
 155                         this->window_height = this->height;
 156                 }
 157
 158                 // Set the sdl flags
 159                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 160
 161                 // Allow thread to be started/stopped
 162                 parent->start = consumer_start;
 163                 parent->stop = consumer_stop;
 164                 parent->is_stopped = consumer_is_stopped;
 165
 166                 // Register specific events
 167                 mlt_events_register( this->properties, "consumer-sdl-event", ( mlt_transmitter )consumer_sdl_event );
 168
 169                 // Return the consumer produced
 170                 return parent;
 171         }
 172
 173         // malloc or consumer init failed
 174         free( this );
 175
 176         // Indicate failure
 177         return NULL;
 178 }
 179
 180 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 181 {
 182         if ( listener != NULL )
 183                 listener( owner, this, ( SDL_Event * )args[ 0 ] );
 184 }
 185
 186 int consumer_start( mlt_consumer parent )
 187 {
 188         consumer_sdl this = parent->child;
 189
 190         if ( !this->running )
 191         {
 192                 pthread_attr_t thread_attributes;
 193
 194                 consumer_stop( parent );
 195
 196                 this->running = 1;
 197                 this->joined = 0;
 198
 199                 // Allow the user to force resizing to window size
 200                 if ( mlt_properties_get_int( this->properties, "resize" ) )
 201                 {
 202                         mlt_properties_set_int( this->properties, "width", this->width );
 203                         mlt_properties_set_int( this->properties, "height", this->height );
 204                 }
 205
 206                 // Inherit the scheduling priority
 207                 pthread_attr_init( &thread_attributes );
 208                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
 209
 210                 pthread_create( &this->thread, &thread_attributes, consumer_thread, this );
 211         }
 212
 213         return 0;
 214 }
 215
 216 int consumer_stop( mlt_consumer parent )
 217 {
 218         // Get the actual object
 219         consumer_sdl this = parent->child;
 220
 221         if ( this->joined == 0 )
 222         {
 223                 // Kill the thread and clean up
 224                 this->running = 0;
 225
 226                 pthread_mutex_lock( &this->audio_mutex );
 227                 pthread_cond_broadcast( &this->audio_cond );
 228                 pthread_mutex_unlock( &this->audio_mutex );
 229
 230                 pthread_join( this->thread, NULL );
 231                 this->joined = 1;
 232         }
 233
 234         return 0;
 235 }
 236
 237 int consumer_is_stopped( mlt_consumer parent )
 238 {
 239         consumer_sdl this = parent->child;
 240         return !this->running;
 241 }
 242
 243 static int sdl_lock_display( )
 244 {
 245         SDL_Surface *screen = SDL_GetVideoSurface( );
 246         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 247 }
 248
 249 static void sdl_unlock_display( )
 250 {
 251         SDL_Surface *screen = SDL_GetVideoSurface( );
 252         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 253                 SDL_UnlockSurface( screen );
 254 }
 255
 256 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 257 {
 258         consumer_sdl this = udata;
 259
 260         // Get the volume
 261         float volume = mlt_properties_get_double( this->properties, "volume" );
 262
 263         pthread_mutex_lock( &this->audio_mutex );
 264
 265         // Block until audio received
 266         while ( this->running && len > this->audio_avail )
 267                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 268
 269         if ( this->audio_avail >= len )
 270         {
 271                 // Place in the audio buffer
 272                 memcpy( stream, this->audio_buffer, len );
 273
 274                 // Remove len from the audio available
 275                 this->audio_avail -= len;
 276
 277                 // Remove the samples
 278                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 279         }
 280         else
 281         {
 282                 // Just to be safe, wipe the stream first
 283                 memset( stream, 0, len );
 284
 285                 // Copy what we have into the stream
 286                 memcpy( stream, this->audio_buffer, this->audio_avail );
 287
 288                 // Mix the audio
 289                 SDL_MixAudio( stream, stream, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 290
 291                 // No audio left
 292                 this->audio_avail = 0;
 293         }
 294
 295         // We're definitely playing now
 296         this->playing = 1;
 297
 298         pthread_cond_broadcast( &this->audio_cond );
 299         pthread_mutex_unlock( &this->audio_mutex );
 300 }
 301
 302 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 303 {
 304         // Get the properties of this consumer
 305         mlt_properties properties = this->properties;
 306         mlt_audio_format afmt = mlt_audio_pcm;
 307
 308         // Set the preferred params of the test card signal
 309         int channels = mlt_properties_get_int( properties, "channels" );
 310         int frequency = mlt_properties_get_int( properties, "frequency" );
 311         static int counter = 0;
 312
 313         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 314
 315         int16_t *pcm;
 316         int bytes;
 317
 318         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 319         *duration = ( ( samples * 1000 ) / frequency );
 320
 321         if ( mlt_properties_get_int( properties, "audio_off" ) )
 322         {
 323                 this->playing = 1;
 324                 init_audio = 1;
 325                 return init_audio;
 326         }
 327
 328         if ( init_audio == 1 )
 329         {
 330                 SDL_AudioSpec request;
 331                 SDL_AudioSpec got;
 332
 333                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 334
 335                 // specify audio format
 336                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 337                 this->playing = 0;
 338                 request.freq = frequency;
 339                 request.format = AUDIO_S16;
 340                 request.channels = channels;
 341                 request.samples = audio_buffer;
 342                 request.callback = sdl_fill_audio;
 343                 request.userdata = (void *)this;
 344                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 345                 {
 346                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 347                         init_audio = 2;
 348                 }
 349                 else if ( got.size != 0 )
 350                 {
 351                         SDL_PauseAudio( 0 );
 352                         init_audio = 0;
 353                 }
 354         }
 355
 356         if ( init_audio == 0 )
 357         {
 358                 mlt_properties properties = mlt_frame_properties( frame );
 359                 bytes = ( samples * channels * 2 );
 360                 pthread_mutex_lock( &this->audio_mutex );
 361                 while ( this->running && bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 362                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 363                 if ( this->running )
 364                 {
 365                         if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 366                                 memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 367                         else
 368                                 memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 369                         this->audio_avail += bytes;
 370                 }
 371                 pthread_cond_broadcast( &this->audio_cond );
 372                 pthread_mutex_unlock( &this->audio_mutex );
 373         }
 374         else
 375         {
 376                 this->playing = 1;
 377         }
 378
 379         return init_audio;
 380 }
 381
 382 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 383 {
 384         // Get the properties of this consumer
 385         mlt_properties properties = this->properties;
 386
 387         mlt_image_format vfmt = mlt_image_yuv422;
 388         int width = this->width, height = this->height;
 389         uint8_t *image;
 390         int changed = 0;
 391
 392         if ( mlt_properties_get_int( properties, "video_off" ) == 0 )
 393         {
 394                 // Get the image, width and height
 395                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 396                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 397
 398                 // Handle events
 399                 if ( this->sdl_screen != NULL )
 400                 {
 401                         SDL_Event event;
 402
 403                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 404
 405                         while ( SDL_PollEvent( &event ) )
 406                         {
 407                                 mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 408
 409                                 switch( event.type )
 410                                 {
 411                                         case SDL_VIDEORESIZE:
 412                                                 this->window_width = event.resize.w;
 413                                                 this->window_height = event.resize.h;
 414                                                 changed = 1;
 415                                                 break;
 416                                         case SDL_QUIT:
 417                                                 this->running = 0;
 418                                                 break;
 419                                         case SDL_KEYDOWN:
 420                                                 {
 421                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 422                                                         char keyboard[ 2 ] = " ";
 423                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 424                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 425                                                         {
 426                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 427                                                                 callback( producer, keyboard );
 428                                                         }
 429                                                 }
 430                                                 break;
 431                                 }
 432                         }
 433                 }
 434
 435                 if ( width != this->width || height != this->height ||
 436                          ( ( int )( this->last_frame_aspect * 1000 ) != ( int )( mlt_frame_get_aspect_ratio( frame ) * 1000 ) &&
 437                          ( mlt_frame_get_aspect_ratio( frame ) != 1.0 || this->last_frame_aspect == 0.0 ) ) )
 438
 439                 {
 440                         this->width = width;
 441                         this->height = height;
 442                         this->last_frame_aspect = mlt_frame_get_aspect_ratio( frame );
 443                         changed = 1;
 444                 }
 445
 446                 if ( this->sdl_screen == NULL || changed )
 447                 {
 448                         // Determine frame's display aspect ratio
 449                         float frame_aspect = mlt_frame_get_aspect_ratio( frame ) * this->width / this->height;
 450
 451                         // Determine window's new display aspect ratio
 452                         float this_aspect = ( float )this->window_width / this->window_height;
 453
 454                         // If using hardware scaler
 455                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 456                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 457                         {
 458                                 // Special case optimisation to negate odd effect of sample aspect ratio
 459                                 // not corresponding exactly with image resolution.
 460                                 if ( ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) ) &&
 461                                          ( (int)( mlt_frame_get_aspect_ratio( frame ) * 1000 ) == (int)( this->aspect_ratio * 1000 ) ) )
 462                                 {
 463                                         this->rect.w = this->window_width;
 464                                         this->rect.h = this->window_height;
 465                                 }
 466                                 else
 467                                 {
 468                                         // Use hardware scaler to normalise display aspect ratio
 469                                         this->rect.w = frame_aspect / this_aspect * this->window_width;
 470                                         this->rect.h = this->window_height;
 471                                         if ( this->rect.w > this->window_width )
 472                                         {
 473                                                 this->rect.w = this->window_width;
 474                                                 this->rect.h = this_aspect / frame_aspect * this->window_height;
 475                                         }
 476                                 }
 477                         }
 478                         // Special case optimisation to negate odd effect of sample aspect ratio
 479                         // not corresponding exactly with image resolution.
 480                         else if ( (int)( this_aspect * 1000 ) == (int)( this->display_aspect * 1000 ) )
 481                         {
 482                                 this->rect.w = this->window_width;
 483                                 this->rect.h = this->window_height;
 484                         }
 485                         // Use hardware scaler to normalise sample aspect ratio
 486                         else if ( this->window_height * this->display_aspect > this->window_width )
 487                         {
 488                                 this->rect.w = this->window_width;
 489                                 this->rect.h = this->window_width / this->display_aspect;
 490                         }
 491                         else
 492                         {
 493                                 this->rect.w = this->window_height * this->display_aspect;
 494                                 this->rect.h = this->window_height;
 495                         }
 496
 497                         this->rect.x = ( this->window_width - this->rect.w ) / 2;
 498                         this->rect.y = ( this->window_height - this->rect.h ) / 2;
 499
 500                         mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 501                         mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 502                         mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 503                         mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 504
 505                         // Force an overlay recreation
 506                         if ( this->sdl_overlay != NULL )
 507                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 508
 509                         // open SDL window with video overlay, if possible
 510                         sdl_lock_display();
 511                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 512                         sdl_unlock_display();
 513
 514                         if ( this->sdl_screen != NULL )
 515                         {
 516                                 SDL_SetClipRect( this->sdl_screen, &this->rect );
 517                                 sdl_lock_display();
 518                                 this->sdl_overlay = SDL_CreateYUVOverlay( this->width, this->height, SDL_YUY2_OVERLAY, this->sdl_screen );
 519                                 sdl_unlock_display();
 520                         }
 521                 }
 522
 523                 if ( mlt_properties_get_int( properties, "changed" ) )
 524                 {
 525                         sdl_lock_display();
 526                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 527                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 528                         SDL_Flip( this->sdl_screen );
 529                         sdl_unlock_display();
 530                         mlt_properties_set_int( properties, "changed", 0 );
 531                 }
 532
 533                 if ( this->sdl_screen != NULL && this->sdl_overlay != NULL )
 534                 {
 535                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 536                         sdl_lock_display();
 537                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 538                         {
 539                                 if ( image != NULL )
 540                                         memcpy( this->buffer, image, width * height * 2 );
 541                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 542                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 543                         }
 544                         sdl_unlock_display();
 545                 }
 546         }
 547
 548         return 0;
 549 }
 550
 551 static void *video_thread( void *arg )
 552 {
 553         // Identify the arg
 554         consumer_sdl this = arg;
 555
 556         // Obtain time of thread start
 557         struct timeval now;
 558         int64_t start = 0;
 559         int64_t elapsed = 0;
 560         struct timespec tm;
 561         mlt_frame next = NULL;
 562         mlt_properties properties = NULL;
 563         double speed = 0;
 564
 565         // Get real time flag
 566         int real_time = mlt_properties_get_int( this->properties, "real_time" );
 567
 568         // Get the current time
 569         gettimeofday( &now, NULL );
 570
 571         // Determine start time
 572         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 573
 574         while ( this->running )
 575         {
 576                 // Pop the next frame
 577                 pthread_mutex_lock( &this->video_mutex );
 578                 while ( ( next = mlt_deque_pop_front( this->queue ) ) == NULL && this->running )
 579                         pthread_cond_wait( &this->video_cond, &this->video_mutex );
 580                 pthread_mutex_unlock( &this->video_mutex );
 581
 582                 // Get the properties
 583                 properties =  mlt_frame_properties( next );
 584
 585                 // Get the speed of the frame
 586                 speed = mlt_properties_get_double( properties, "_speed" );
 587
 588                 // Get the current time
 589                 gettimeofday( &now, NULL );
 590
 591                 // Get the elapsed time
 592                 elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 593
 594                 // See if we have to delay the display of the current frame
 595                 if ( mlt_properties_get_int( properties, "rendered" ) == 1 && this->running )
 596                 {
 597                         // Obtain the scheduled playout time
 598                         mlt_position scheduled = mlt_properties_get_position( properties, "playtime" );
 599
 600                         // Determine the difference between the elapsed time and the scheduled playout time
 601                         mlt_position difference = scheduled - elapsed;
 602
 603                         // Smooth playback a bit
 604                         if ( real_time && ( difference > 20000 && speed == 1.0 ) )
 605                         {
 606                                 tm.tv_sec = difference / 1000000;
 607                                 tm.tv_nsec = ( difference % 1000000 ) * 500;
 608                                 nanosleep( &tm, NULL );
 609                         }
 610
 611                         // Show current frame if not too old
 612                         if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( this->queue ) < 2 ) )
 613                                 consumer_play_video( this, next );
 614
 615                         // If the queue is empty, recalculate start to allow build up again
 616                         if ( real_time && ( mlt_deque_count( this->queue ) == 0 && speed == 1.0 ) )
 617                         {
 618                                 gettimeofday( &now, NULL );
 619                                 start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
 620                         }
 621                 }
 622
 623                 // This frame can now be closed
 624                 mlt_frame_close( next );
 625         }
 626
 627         mlt_consumer_stopped( &this->parent );
 628
 629         return NULL;
 630 }
 631
 632 /** Threaded wrapper for pipe.
 633 */
 634
 635 static void *consumer_thread( void *arg )
 636 {
 637         // Identify the arg
 638         consumer_sdl this = arg;
 639
 640         // Get the consumer
 641         mlt_consumer consumer = &this->parent;
 642
 643         // Video thread
 644         pthread_t thread;
 645
 646         // internal intialization
 647         int init_audio = 1;
 648         int init_video = 1;
 649         mlt_frame frame = NULL;
 650         mlt_properties properties = NULL;
 651         int duration = 0;
 652         int64_t playtime = 0;
 653         struct timespec tm = { 0, 100000 };
 654
 655         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE ) < 0 )
 656         {
 657                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 658                 return NULL;
 659         }
 660
 661         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 662         SDL_EnableUNICODE( 1 );
 663
 664         // Loop until told not to
 665         while( this->running )
 666         {
 667                 // Get a frame from the attached producer
 668                 frame = mlt_consumer_rt_frame( consumer );
 669
 670                 // Ensure that we have a frame
 671                 if ( frame != NULL )
 672                 {
 673                         // Get the frame properties
 674                         properties =  mlt_frame_properties( frame );
 675
 676                         // Play audio
 677                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 678
 679                         // Determine the start time now
 680                         if ( this->playing && init_video )
 681                         {
 682                                 // Create the video thread
 683                                 pthread_create( &thread, NULL, video_thread, this );
 684
 685                                 // Video doesn't need to be initialised any more
 686                                 init_video = 0;
 687                         }
 688
 689                         // Set playtime for this frame
 690                         mlt_properties_set_position( properties, "playtime", playtime );
 691
 692                         while ( this->running && mlt_deque_count( this->queue ) > 15 )
 693                                 nanosleep( &tm, NULL );
 694
 695                         // Push this frame to the back of the queue
 696                         pthread_mutex_lock( &this->video_mutex );
 697                         mlt_deque_push_back( this->queue, frame );
 698                         pthread_cond_broadcast( &this->video_cond );
 699                         pthread_mutex_unlock( &this->video_mutex );
 700
 701                         // Calculate the next playtime
 702                         playtime += ( duration * 1000 );
 703                 }
 704         }
 705
 706         // Kill the video thread
 707         if ( init_video == 0 )
 708         {
 709                 pthread_mutex_lock( &this->video_mutex );
 710                 pthread_cond_broadcast( &this->video_cond );
 711                 pthread_mutex_unlock( &this->video_mutex );
 712                 pthread_join( thread, NULL );
 713         }
 714
 715         // internal cleanup
 716         if ( this->sdl_overlay != NULL )
 717                 SDL_FreeYUVOverlay( this->sdl_overlay );
 718         SDL_Quit( );
 719
 720         while( mlt_deque_count( this->queue ) )
 721                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 722
 723         this->sdl_screen = NULL;
 724         this->sdl_overlay = NULL;
 725         this->audio_avail = 0;
 726
 727         return NULL;
 728 }
 729
 730 static int consumer_get_dimensions( int *width, int *height )
 731 {
 732         int changed = 0;
 733
 734         // SDL windows manager structure
 735         SDL_SysWMinfo wm;
 736
 737         // Specify the SDL Version
 738         SDL_VERSION( &wm.version );
 739
 740         // Lock the display
 741         sdl_lock_display();
 742
 743         // Get the wm structure
 744         if ( SDL_GetWMInfo( &wm ) == 1 )
 745         {
 746                 // Check that we have the X11 wm
 747                 if ( wm.subsystem == SDL_SYSWM_X11 )
 748                 {
 749                         // Get the SDL window
 750                         Window window = wm.info.x11.window;
 751
 752                         // Get the display session
 753                         Display *display = wm.info.x11.display;
 754
 755                         // Get the window attributes
 756                         XWindowAttributes attr;
 757                         XGetWindowAttributes( display, window, &attr );
 758
 759                         // Determine whether window has changed
 760                         changed = *width != attr.width || *height != attr.height;
 761
 762                         // Return width and height
 763                         *width = attr.width;
 764                         *height = attr.height;
 765                 }
 766         }
 767
 768         // Unlock the display
 769         sdl_lock_display();
 770
 771         return changed;
 772 }
 773
 774 /** Callback to allow override of the close method.
 775 */
 776
 777 static void consumer_close( mlt_consumer parent )
 778 {
 779         // Get the actual object
 780         consumer_sdl this = parent->child;
 781
 782         // Stop the consumer
 783         mlt_consumer_stop( parent );
 784
 785         // Close the queue
 786         mlt_deque_close( this->queue );
 787
 788         // Destroy mutexes
 789         pthread_mutex_destroy( &this->audio_mutex );
 790         pthread_cond_destroy( &this->audio_cond );
 791
 792         // Now clean up the rest
 793         mlt_consumer_close( parent );
 794
 795         // Finally clean up this
 796         free( this );
 797 }