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 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
  35 extern pthread_mutex_t mlt_sdl_mutex;
  36
  37 /** This classes definition.
  38 */
  39
  40 typedef struct consumer_sdl_s *consumer_sdl;
  41
  42 struct consumer_sdl_s
  43 {
  44         struct mlt_consumer_s parent;
  45         mlt_properties properties;
  46         mlt_deque queue;
  47         pthread_t thread;
  48         int joined;
  49         int running;
  50         uint8_t audio_buffer[ 4096 * 10 ];
  51         int audio_avail;
  52         pthread_mutex_t audio_mutex;
  53         pthread_cond_t audio_cond;
  54         pthread_mutex_t video_mutex;
  55         pthread_cond_t video_cond;
  56         int window_width;
  57         int window_height;
  58         int previous_width;
  59         int previous_height;
  60         int width;
  61         int height;
  62         int playing;
  63         int sdl_flags;
  64         SDL_Surface *sdl_screen;
  65         SDL_Overlay *sdl_overlay;
  66         SDL_Rect rect;
  67         uint8_t *buffer;
  68         int bpp;
  69 };
  70
  71 /** Forward references to static functions.
  72 */
  73
  74 static int consumer_start( mlt_consumer parent );
  75 static int consumer_stop( mlt_consumer parent );
  76 static int consumer_is_stopped( mlt_consumer parent );
  77 static void consumer_close( mlt_consumer parent );
  78 static void *consumer_thread( void * );
  79 static int consumer_get_dimensions( int *width, int *height );
  80 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  81
  82 /** This is what will be called by the factory - anything can be passed in
  83         via the argument, but keep it simple.
  84 */
  85
  86 mlt_consumer consumer_sdl_init( mlt_profile profile, mlt_service_type type, const char *id, char *arg )
  87 {
  88         // Create the consumer object
  89         consumer_sdl this = calloc( sizeof( struct consumer_sdl_s ), 1 );
  90
  91         // If no malloc'd and consumer init ok
  92         if ( this != NULL && mlt_consumer_init( &this->parent, this, profile ) == 0 )
  93         {
  94                 // Create the queue
  95                 this->queue = mlt_deque_init( );
  96
  97                 // Get the parent consumer object
  98                 mlt_consumer parent = &this->parent;
  99
 100                 // We have stuff to clean up, so override the close method
 101                 parent->close = consumer_close;
 102
 103                 // get a handle on properties
 104                 mlt_service service = MLT_CONSUMER_SERVICE( parent );
 105                 this->properties = MLT_SERVICE_PROPERTIES( service );
 106
 107                 // Set the default volume
 108                 mlt_properties_set_double( this->properties, "volume", 1.0 );
 109
 110                 // This is the initialisation of the consumer
 111                 pthread_mutex_init( &this->audio_mutex, NULL );
 112                 pthread_cond_init( &this->audio_cond, NULL);
 113                 pthread_mutex_init( &this->video_mutex, NULL );
 114                 pthread_cond_init( &this->video_cond, NULL);
 115
 116                 // Default scaler (for now we'll use nearest)
 117                 mlt_properties_set( this->properties, "rescale", "nearest" );
 118                 mlt_properties_set( this->properties, "deinterlace_method", "onefield" );
 119
 120                 // Default buffer for low latency
 121                 mlt_properties_set_int( this->properties, "buffer", 1 );
 122
 123                 // Default audio buffer
 124                 mlt_properties_set_int( this->properties, "audio_buffer", 512 );
 125
 126                 // Ensure we don't join on a non-running object
 127                 this->joined = 1;
 128
 129                 // process actual param
 130                 if ( arg == NULL || sscanf( arg, "%dx%d", &this->width, &this->height ) != 2 )
 131                 {
 132                         this->width = mlt_properties_get_int( this->properties, "width" );
 133                         this->height = mlt_properties_get_int( this->properties, "height" );
 134                 }
 135
 136                 // Set the sdl flags
 137                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 138
 139                 // Allow thread to be started/stopped
 140                 parent->start = consumer_start;
 141                 parent->stop = consumer_stop;
 142                 parent->is_stopped = consumer_is_stopped;
 143
 144                 // Register specific events
 145                 mlt_events_register( this->properties, "consumer-sdl-event", ( mlt_transmitter )consumer_sdl_event );
 146
 147                 // Return the consumer produced
 148                 return parent;
 149         }
 150
 151         // malloc or consumer init failed
 152         free( this );
 153
 154         // Indicate failure
 155         return NULL;
 156 }
 157
 158 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 159 {
 160         if ( listener != NULL )
 161                 listener( owner, this, ( SDL_Event * )args[ 0 ] );
 162 }
 163
 164 int consumer_start( mlt_consumer parent )
 165 {
 166         consumer_sdl this = parent->child;
 167
 168         if ( !this->running )
 169         {
 170                 int video_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "video_off" );
 171                 int preview_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "preview_off" );
 172                 int display_off = video_off | preview_off;
 173                 int audio_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "audio_off" );
 174                 int sdl_started = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" );
 175
 176                 consumer_stop( parent );
 177
 178                 this->running = 1;
 179                 this->joined = 0;
 180
 181                 if ( mlt_properties_get_int( this->properties, "width" ) > 0 )
 182                         this->width = mlt_properties_get_int( this->properties, "width" );
 183                 if ( mlt_properties_get_int( this->properties, "height" ) > 0 )
 184                         this->height = mlt_properties_get_int( this->properties, "height" );
 185
 186                 this->bpp = mlt_properties_get_int( this->properties, "bpp" );
 187
 188                 if ( sdl_started == 0 && display_off == 0 )
 189                 {
 190                         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 191                         {
 192                                 mlt_log_error( MLT_CONSUMER_SERVICE(parent), "Failed to initialize SDL: %s\n", SDL_GetError() );
 193                                 return -1;
 194                         }
 195
 196                         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 197                         SDL_EnableUNICODE( 1 );
 198                 }
 199                 else if ( display_off == 0 )
 200                 {
 201                         this->sdl_screen = SDL_GetVideoSurface( );
 202                 }
 203
 204                 if ( audio_off == 0 )
 205                         SDL_InitSubSystem( SDL_INIT_AUDIO );
 206
 207                 // Default window size
 208                 double display_ratio = mlt_properties_get_double( this->properties, "display_ratio" );
 209                 this->window_width = ( double )this->height * display_ratio;
 210                 this->window_height = this->height;
 211
 212                 if ( this->sdl_screen == NULL && display_off == 0 )
 213                 {
 214                         if ( mlt_properties_get_int( this->properties, "fullscreen" ) )
 215                         {
 216                                 const SDL_VideoInfo *vi = SDL_GetVideoInfo();
 217                                 this->window_width = vi->current_w;
 218                                 this->window_height = vi->current_h;
 219                                 this->sdl_flags |= SDL_FULLSCREEN;
 220                                 SDL_ShowCursor( SDL_DISABLE );
 221                         }
 222                         pthread_mutex_lock( &mlt_sdl_mutex );
 223                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 224                         pthread_mutex_unlock( &mlt_sdl_mutex );
 225                 }
 226
 227                 pthread_create( &this->thread, NULL, consumer_thread, this );
 228         }
 229
 230         return 0;
 231 }
 232
 233 int consumer_stop( mlt_consumer parent )
 234 {
 235         // Get the actual object
 236         consumer_sdl this = parent->child;
 237
 238         if ( this->joined == 0 )
 239         {
 240                 // Kill the thread and clean up
 241                 this->joined = 1;
 242                 this->running = 0;
 243                 if ( this->thread )
 244                         pthread_join( this->thread, NULL );
 245
 246                 // internal cleanup
 247                 if ( this->sdl_overlay != NULL )
 248                         SDL_FreeYUVOverlay( this->sdl_overlay );
 249                 this->sdl_overlay = NULL;
 250
 251                 if ( !mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "audio_off" ) )
 252                 {
 253                         pthread_mutex_lock( &this->audio_mutex );
 254                         pthread_cond_broadcast( &this->audio_cond );
 255                         pthread_mutex_unlock( &this->audio_mutex );
 256                         SDL_QuitSubSystem( SDL_INIT_AUDIO );
 257                 }
 258
 259                 if ( mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" ) == 0 )
 260                 {
 261                         pthread_mutex_lock( &mlt_sdl_mutex );
 262                         SDL_Quit( );
 263                         pthread_mutex_unlock( &mlt_sdl_mutex );
 264                 }
 265
 266                 this->sdl_screen = NULL;
 267         }
 268
 269         return 0;
 270 }
 271
 272 int consumer_is_stopped( mlt_consumer parent )
 273 {
 274         consumer_sdl this = parent->child;
 275         return !this->running;
 276 }
 277
 278 static int sdl_lock_display( )
 279 {
 280         pthread_mutex_lock( &mlt_sdl_mutex );
 281         SDL_Surface *screen = SDL_GetVideoSurface( );
 282         int result = screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 283         pthread_mutex_unlock( &mlt_sdl_mutex );
 284         return result;
 285 }
 286
 287 static void sdl_unlock_display( )
 288 {
 289         pthread_mutex_lock( &mlt_sdl_mutex );
 290         SDL_Surface *screen = SDL_GetVideoSurface( );
 291         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 292                 SDL_UnlockSurface( screen );
 293         pthread_mutex_unlock( &mlt_sdl_mutex );
 294 }
 295
 296 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 297 {
 298         consumer_sdl this = udata;
 299
 300         // Get the volume
 301         double volume = mlt_properties_get_double( this->properties, "volume" );
 302
 303         pthread_mutex_lock( &this->audio_mutex );
 304
 305         // Block until audio received
 306         while ( this->running && len > this->audio_avail )
 307                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 308
 309         if ( this->audio_avail >= len )
 310         {
 311                 // Place in the audio buffer
 312                 if ( volume != 1.0 )
 313                         SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 314                 else
 315                         memcpy( stream, this->audio_buffer, len );
 316
 317                 // Remove len from the audio available
 318                 this->audio_avail -= len;
 319
 320                 // Remove the samples
 321                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 322         }
 323         else
 324         {
 325                 // Just to be safe, wipe the stream first
 326                 memset( stream, 0, len );
 327
 328                 // Mix the audio
 329                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 330
 331                 // No audio left
 332                 this->audio_avail = 0;
 333         }
 334
 335         // We're definitely playing now
 336         this->playing = 1;
 337
 338         pthread_cond_broadcast( &this->audio_cond );
 339         pthread_mutex_unlock( &this->audio_mutex );
 340 }
 341
 342 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 343 {
 344         // Get the properties of this consumer
 345         mlt_properties properties = this->properties;
 346         mlt_audio_format afmt = mlt_audio_s16;
 347
 348         // Set the preferred params of the test card signal
 349         int channels = mlt_properties_get_int( properties, "channels" );
 350         int dest_channels = channels;
 351         int frequency = mlt_properties_get_int( properties, "frequency" );
 352         static int counter = 0;
 353
 354         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 355
 356         int16_t *pcm;
 357         int bytes;
 358
 359         mlt_frame_get_audio( frame, (void**) &pcm, &afmt, &frequency, &channels, &samples );
 360         *duration = ( ( samples * 1000 ) / frequency );
 361         pcm += mlt_properties_get_int( properties, "audio_offset" );
 362
 363         if ( mlt_properties_get_int( properties, "audio_off" ) )
 364         {
 365                 this->playing = 1;
 366                 init_audio = 1;
 367                 return init_audio;
 368         }
 369
 370         if ( init_audio == 1 )
 371         {
 372                 SDL_AudioSpec request;
 373                 SDL_AudioSpec got;
 374
 375                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 376
 377                 // specify audio format
 378                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 379                 this->playing = 0;
 380                 request.freq = frequency;
 381                 request.format = AUDIO_S16SYS;
 382                 request.channels = dest_channels;
 383                 request.samples = audio_buffer;
 384                 request.callback = sdl_fill_audio;
 385                 request.userdata = (void *)this;
 386                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 387                 {
 388                         mlt_log_error( MLT_CONSUMER_SERVICE( this ), "SDL failed to open audio: %s\n", SDL_GetError() );
 389                         init_audio = 2;
 390                 }
 391                 else if ( got.size != 0 )
 392                 {
 393                         SDL_PauseAudio( 0 );
 394                         init_audio = 0;
 395                 }
 396         }
 397
 398         if ( init_audio == 0 )
 399         {
 400                 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 401
 402                 bytes = samples * dest_channels * sizeof(*pcm);
 403                 pthread_mutex_lock( &this->audio_mutex );
 404                 while ( this->running && bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 405                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 406                 if ( this->running )
 407                 {
 408                         if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 409                         {
 410                                 if ( channels == dest_channels )
 411                                 {
 412                                         memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 413                                 }
 414                                 else
 415                                 {
 416                                         int16_t *dest = (int16_t*) &this->audio_buffer[ this->audio_avail ];
 417                                         int i = samples + 1;
 418
 419                                         while ( --i )
 420                                         {
 421                                                 memcpy( dest, pcm, dest_channels * sizeof(*pcm) );
 422                                                 pcm += channels;
 423                                                 dest += dest_channels;
 424                                         }
 425                                 }
 426                         }
 427                         else
 428                         {
 429                                 memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 430                         }
 431                         this->audio_avail += bytes;
 432                 }
 433                 pthread_cond_broadcast( &this->audio_cond );
 434                 pthread_mutex_unlock( &this->audio_mutex );
 435         }
 436         else
 437         {
 438                 this->playing = 1;
 439         }
 440
 441         return init_audio;
 442 }
 443
 444 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 445 {
 446         // Get the properties of this consumer
 447         mlt_properties properties = this->properties;
 448
 449         mlt_image_format vfmt = mlt_image_yuv422;
 450         int width = this->width, height = this->height;
 451         uint8_t *image;
 452         int changed = 0;
 453
 454         int video_off = mlt_properties_get_int( properties, "video_off" );
 455         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 456         mlt_image_format preview_format = mlt_properties_get_int( properties, "preview_format" );
 457         int display_off = video_off | preview_off;
 458
 459         if ( this->running && display_off == 0 )
 460         {
 461                 // Get the image, width and height
 462                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 463                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 464                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 465
 466                 // Handle events
 467                 if ( this->sdl_screen != NULL )
 468                 {
 469                         SDL_Event event;
 470
 471                         sdl_lock_display( );
 472                         pthread_mutex_lock( &mlt_sdl_mutex );
 473                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 474                         pthread_mutex_unlock( &mlt_sdl_mutex );
 475                         sdl_unlock_display( );
 476
 477                         while ( SDL_PollEvent( &event ) )
 478                         {
 479                                 mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 480
 481                                 switch( event.type )
 482                                 {
 483                                         case SDL_VIDEORESIZE:
 484                                                 this->window_width = event.resize.w;
 485                                                 this->window_height = event.resize.h;
 486                                                 changed = 1;
 487                                                 break;
 488                                         case SDL_QUIT:
 489                                                 this->running = 0;
 490                                                 break;
 491                                         case SDL_KEYDOWN:
 492                                                 {
 493                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 494                                                         char keyboard[ 2 ] = " ";
 495                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 496                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 497                                                         {
 498                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 499                                                                 callback( producer, keyboard );
 500                                                         }
 501                                                 }
 502                                                 break;
 503                                 }
 504                         }
 505                 }
 506
 507                 sdl_lock_display();
 508
 509                 if ( width != this->width || height != this->height )
 510                 {
 511                         if ( this->sdl_overlay != NULL )
 512                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 513                         this->sdl_overlay = NULL;
 514                 }
 515
 516                 if ( this->running && ( this->sdl_screen == NULL || changed ) )
 517                 {
 518                         // Force an overlay recreation
 519                         if ( this->sdl_overlay != NULL )
 520                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 521                         this->sdl_overlay = NULL;
 522
 523                         // open SDL window with video overlay, if possible
 524                         pthread_mutex_lock( &mlt_sdl_mutex );
 525                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, this->bpp, this->sdl_flags );
 526                         if ( consumer_get_dimensions( &this->window_width, &this->window_height ) )
 527                                 this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, this->bpp, this->sdl_flags );
 528                         pthread_mutex_unlock( &mlt_sdl_mutex );
 529
 530                         uint32_t color = mlt_properties_get_int( this->properties, "window_background" );
 531                         SDL_FillRect( this->sdl_screen, NULL, color >> 8 );
 532                         SDL_Flip( this->sdl_screen );
 533                 }
 534
 535                 if ( this->running )
 536                 {
 537                         // Determine window's new display aspect ratio
 538                         double this_aspect = ( double )this->window_width / this->window_height;
 539
 540                         // Get the display aspect ratio
 541                         double display_ratio = mlt_properties_get_double( properties, "display_ratio" );
 542
 543                         // Determine frame's display aspect ratio
 544                         double frame_aspect = mlt_frame_get_aspect_ratio( frame ) * width / height;
 545
 546                         // Store the width and height received
 547                         this->width = width;
 548                         this->height = height;
 549
 550                         // If using hardware scaler
 551                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 552                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 553                         {
 554                                 // Use hardware scaler to normalise display aspect ratio
 555                                 this->rect.w = frame_aspect / this_aspect * this->window_width;
 556                                 this->rect.h = this->window_height;
 557                                 if ( this->rect.w > this->window_width )
 558                                 {
 559                                         this->rect.w = this->window_width;
 560                                         this->rect.h = this_aspect / frame_aspect * this->window_height;
 561                                 }
 562                         }
 563                         // Special case optimisation to negate odd effect of sample aspect ratio
 564                         // not corresponding exactly with image resolution.
 565                         else if ( (int)( this_aspect * 1000 ) == (int)( display_ratio * 1000 ) )
 566                         {
 567                                 this->rect.w = this->window_width;
 568                                 this->rect.h = this->window_height;
 569                         }
 570                         // Use hardware scaler to normalise sample aspect ratio
 571                         else if ( this->window_height * display_ratio > this->window_width )
 572                         {
 573                                 this->rect.w = this->window_width;
 574                                 this->rect.h = this->window_width / display_ratio;
 575                         }
 576                         else
 577                         {
 578                                 this->rect.w = this->window_height * display_ratio;
 579                                 this->rect.h = this->window_height;
 580                         }
 581
 582                         this->rect.x = ( this->window_width - this->rect.w ) / 2;
 583                         this->rect.y = ( this->window_height - this->rect.h ) / 2;
 584                         this->rect.x -= this->rect.x % 2;
 585
 586                         mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 587                         mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 588                         mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 589                         mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 590
 591                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 592                 }
 593
 594                 if ( this->running && this->sdl_screen != NULL && this->sdl_overlay == NULL )
 595                 {
 596                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 597                         this->sdl_overlay = SDL_CreateYUVOverlay( width, height, SDL_YUY2_OVERLAY, this->sdl_screen );
 598                 }
 599
 600                 if ( this->running && this->sdl_screen != NULL && this->sdl_overlay != NULL )
 601                 {
 602                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 603                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 604                         {
 605                                 if ( image != NULL )
 606                                         memcpy( this->buffer, image, width * height * 2 );
 607                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 608                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 609                         }
 610                 }
 611
 612                 sdl_unlock_display();
 613         }
 614         else if ( this->running )
 615         {
 616                 vfmt = preview_format == mlt_image_none ? mlt_image_rgb24a : preview_format;
 617                 if ( !video_off )
 618                         mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 619                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 620                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 621         }
 622
 623         return 0;
 624 }
 625
 626 static void *video_thread( void *arg )
 627 {
 628         // Identify the arg
 629         consumer_sdl this = arg;
 630
 631         // Obtain time of thread start
 632         struct timeval now;
 633         int64_t start = 0;
 634         int64_t elapsed = 0;
 635         struct timespec tm;
 636         mlt_frame next = NULL;
 637         mlt_properties properties = NULL;
 638         double speed = 0;
 639
 640         // Get real time flag
 641         int real_time = mlt_properties_get_int( this->properties, "real_time" );
 642
 643         // Get the current time
 644         gettimeofday( &now, NULL );
 645
 646         // Determine start time
 647         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 648
 649         while ( this->running )
 650         {
 651                 // Pop the next frame
 652                 pthread_mutex_lock( &this->video_mutex );
 653                 next = mlt_deque_pop_front( this->queue );
 654                 while ( next == NULL && this->running )
 655                 {
 656                         pthread_cond_wait( &this->video_cond, &this->video_mutex );
 657                         next = mlt_deque_pop_front( this->queue );
 658                 }
 659                 pthread_mutex_unlock( &this->video_mutex );
 660
 661                 if ( !this->running || next == NULL ) break;
 662
 663                 // Get the properties
 664                 properties =  MLT_FRAME_PROPERTIES( next );
 665
 666                 // Get the speed of the frame
 667                 speed = mlt_properties_get_double( properties, "_speed" );
 668
 669                 // Get the current time
 670                 gettimeofday( &now, NULL );
 671
 672                 // Get the elapsed time
 673                 elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 674
 675                 // See if we have to delay the display of the current frame
 676                 if ( mlt_properties_get_int( properties, "rendered" ) == 1 && this->running )
 677                 {
 678                         // Obtain the scheduled playout time
 679                         int64_t scheduled = mlt_properties_get_int( properties, "playtime" );
 680
 681                         // Determine the difference between the elapsed time and the scheduled playout time
 682                         int64_t difference = scheduled - elapsed;
 683
 684                         // Smooth playback a bit
 685                         if ( real_time && ( difference > 20000 && speed == 1.0 ) )
 686                         {
 687                                 tm.tv_sec = difference / 1000000;
 688                                 tm.tv_nsec = ( difference % 1000000 ) * 500;
 689                                 nanosleep( &tm, NULL );
 690                         }
 691
 692                         // Show current frame if not too old
 693                         if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( this->queue ) < 2 ) )
 694                                 consumer_play_video( this, next );
 695
 696                         // If the queue is empty, recalculate start to allow build up again
 697                         if ( real_time && ( mlt_deque_count( this->queue ) == 0 && speed == 1.0 ) )
 698                         {
 699                                 gettimeofday( &now, NULL );
 700                                 start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
 701                         }
 702                 }
 703                 else
 704                 {
 705                         mlt_log_debug( MLT_CONSUMER_SERVICE(&this->parent), "dropped video frame\n" );
 706                 }
 707
 708                 // This frame can now be closed
 709                 mlt_frame_close( next );
 710                 next = NULL;
 711         }
 712
 713         if ( next != NULL )
 714                 mlt_frame_close( next );
 715
 716         mlt_consumer_stopped( &this->parent );
 717
 718         return NULL;
 719 }
 720
 721 /** Threaded wrapper for pipe.
 722 */
 723
 724 static void *consumer_thread( void *arg )
 725 {
 726         // Identify the arg
 727         consumer_sdl this = arg;
 728
 729         // Get the consumer
 730         mlt_consumer consumer = &this->parent;
 731
 732         // Convenience functionality
 733         int terminate_on_pause = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( consumer ), "terminate_on_pause" );
 734         int terminated = 0;
 735
 736         // Video thread
 737         pthread_t thread;
 738
 739         // internal intialization
 740         int init_audio = 1;
 741         int init_video = 1;
 742         mlt_frame frame = NULL;
 743         mlt_properties properties = NULL;
 744         int duration = 0;
 745         int64_t playtime = 0;
 746         struct timespec tm = { 0, 100000 };
 747
 748         // Loop until told not to
 749         while( !terminated && this->running )
 750         {
 751                 // Get a frame from the attached producer
 752                 frame = mlt_consumer_rt_frame( consumer );
 753
 754                 // Check for termination
 755                 if ( terminate_on_pause && frame != NULL )
 756                         terminated = mlt_properties_get_double( MLT_FRAME_PROPERTIES( frame ), "_speed" ) == 0.0;
 757
 758                 // Ensure that we have a frame
 759                 if ( frame != NULL )
 760                 {
 761                         // Get the frame properties
 762                         properties =  MLT_FRAME_PROPERTIES( frame );
 763
 764                         // Play audio
 765                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 766
 767                         // Determine the start time now
 768                         if ( this->playing && init_video )
 769                         {
 770                                 // Create the video thread
 771                                 pthread_create( &thread, NULL, video_thread, this );
 772
 773                                 // Video doesn't need to be initialised any more
 774                                 init_video = 0;
 775                         }
 776
 777                         // Set playtime for this frame
 778                         mlt_properties_set_int( properties, "playtime", playtime );
 779
 780                         while ( this->running && mlt_deque_count( this->queue ) > 15 )
 781                                 nanosleep( &tm, NULL );
 782
 783                         // Push this frame to the back of the queue
 784                         pthread_mutex_lock( &this->video_mutex );
 785                         mlt_deque_push_back( this->queue, frame );
 786                         pthread_cond_broadcast( &this->video_cond );
 787                         pthread_mutex_unlock( &this->video_mutex );
 788
 789                         // Calculate the next playtime
 790                         playtime += ( duration * 1000 );
 791                 }
 792         }
 793
 794         this->running = 0;
 795
 796         // Kill the video thread
 797         if ( init_video == 0 )
 798         {
 799                 pthread_mutex_lock( &this->video_mutex );
 800                 pthread_cond_broadcast( &this->video_cond );
 801                 pthread_mutex_unlock( &this->video_mutex );
 802                 pthread_join( thread, NULL );
 803         }
 804
 805         while( mlt_deque_count( this->queue ) )
 806                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 807
 808         this->sdl_screen = NULL;
 809         this->audio_avail = 0;
 810
 811         return NULL;
 812 }
 813
 814 static int consumer_get_dimensions( int *width, int *height )
 815 {
 816         int changed = 0;
 817
 818         // SDL windows manager structure
 819         SDL_SysWMinfo wm;
 820
 821         // Specify the SDL Version
 822         SDL_VERSION( &wm.version );
 823
 824         // Lock the display
 825         //sdl_lock_display();
 826
 827 #ifndef __DARWIN__
 828         // Get the wm structure
 829         if ( SDL_GetWMInfo( &wm ) == 1 )
 830         {
 831                 // Check that we have the X11 wm
 832                 if ( wm.subsystem == SDL_SYSWM_X11 )
 833                 {
 834                         // Get the SDL window
 835                         Window window = wm.info.x11.window;
 836
 837                         // Get the display session
 838                         Display *display = wm.info.x11.display;
 839
 840                         // Get the window attributes
 841                         XWindowAttributes attr;
 842                         XGetWindowAttributes( display, window, &attr );
 843
 844                         // Determine whether window has changed
 845                         changed = *width != attr.width || *height != attr.height;
 846
 847                         // Return width and height
 848                         *width = attr.width;
 849                         *height = attr.height;
 850                 }
 851         }
 852 #endif
 853
 854         // Unlock the display
 855         //sdl_unlock_display();
 856
 857         return changed;
 858 }
 859
 860 /** Callback to allow override of the close method.
 861 */
 862
 863 static void consumer_close( mlt_consumer parent )
 864 {
 865         // Get the actual object
 866         consumer_sdl this = parent->child;
 867
 868         // Stop the consumer
 869         ///mlt_consumer_stop( parent );
 870
 871         // Now clean up the rest
 872         mlt_consumer_close( parent );
 873
 874         // Close the queue
 875         mlt_deque_close( this->queue );
 876
 877         // Destroy mutexes
 878         pthread_mutex_destroy( &this->audio_mutex );
 879         pthread_cond_destroy( &this->audio_cond );
 880
 881         // Finally clean up this
 882         free( this );
 883 }