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