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 <framework/mlt_factory.h>
  25 #include <framework/mlt_filter.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <pthread.h>
  30 #include <SDL/SDL.h>
  31 #include <SDL/SDL_syswm.h>
  32 #include <sys/time.h>
  33
  34 /** This classes definition.
  35 */
  36
  37 typedef struct consumer_sdl_s *consumer_sdl;
  38
  39 struct consumer_sdl_s
  40 {
  41         struct mlt_consumer_s parent;
  42         mlt_properties properties;
  43         mlt_deque queue;
  44         pthread_t thread;
  45         int joined;
  46         int running;
  47         uint8_t audio_buffer[ 4096 * 10 ];
  48         int audio_avail;
  49         pthread_mutex_t audio_mutex;
  50         pthread_cond_t audio_cond;
  51         pthread_mutex_t video_mutex;
  52         pthread_cond_t video_cond;
  53         int window_width;
  54         int window_height;
  55         int previous_width;
  56         int previous_height;
  57         int width;
  58         int height;
  59         int playing;
  60         int sdl_flags;
  61         SDL_Surface *sdl_screen;
  62         SDL_Overlay *sdl_overlay;
  63         SDL_Rect rect;
  64         uint8_t *buffer;
  65         int bpp;
  66         int filtered;
  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( 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 ) == 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                 // Default display aspect ratio
 106                 double display_ratio = mlt_properties_get_double( this->properties, "display_ratio" );
 107
 108                 // Set the default volume
 109                 mlt_properties_set_double( this->properties, "volume", 1.0 );
 110
 111                 // This is the initialisation of the consumer
 112                 pthread_mutex_init( &this->audio_mutex, NULL );
 113                 pthread_cond_init( &this->audio_cond, NULL);
 114                 pthread_mutex_init( &this->video_mutex, NULL );
 115                 pthread_cond_init( &this->video_cond, NULL);
 116
 117                 // Default scaler (for now we'll use nearest)
 118                 mlt_properties_set( this->properties, "rescale", "nearest" );
 119
 120                 // Default buffer for low latency
 121                 mlt_properties_set_int( this->properties, "buffer", 1 );
 122
 123                 // Default progressive true
 124                 mlt_properties_set_int( this->properties, "progressive", 0 );
 125
 126                 // Default audio buffer
 127                 mlt_properties_set_int( this->properties, "audio_buffer", 512 );
 128
 129                 // Ensure we don't join on a non-running object
 130                 this->joined = 1;
 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
 139                 // Default window size
 140                 this->window_width = ( double )this->height * display_ratio;
 141                 this->window_height = this->height;
 142
 143                 // Set the sdl flags
 144                 this->sdl_flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL | SDL_RESIZABLE | SDL_DOUBLEBUF;
 145
 146                 // Allow thread to be started/stopped
 147                 parent->start = consumer_start;
 148                 parent->stop = consumer_stop;
 149                 parent->is_stopped = consumer_is_stopped;
 150
 151                 // Register specific events
 152                 mlt_events_register( this->properties, "consumer-sdl-event", ( mlt_transmitter )consumer_sdl_event );
 153
 154                 // Return the consumer produced
 155                 return parent;
 156         }
 157
 158         // malloc or consumer init failed
 159         free( this );
 160
 161         // Indicate failure
 162         return NULL;
 163 }
 164
 165 static void consumer_sdl_event( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 166 {
 167         if ( listener != NULL )
 168                 listener( owner, this, ( SDL_Event * )args[ 0 ] );
 169 }
 170
 171 int consumer_start( mlt_consumer parent )
 172 {
 173         consumer_sdl this = parent->child;
 174
 175         if ( !this->running )
 176         {
 177                 int video_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "video_off" );
 178                 int preview_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "preview_off" );
 179                 int display_off = video_off | preview_off;
 180                 int audio_off = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "audio_off" );
 181                 int sdl_started = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" );
 182
 183                 consumer_stop( parent );
 184
 185                 this->running = 1;
 186                 this->joined = 0;
 187
 188                 this->width = mlt_properties_get_int( this->properties, "width" );
 189                 this->height = mlt_properties_get_int( this->properties, "height" );
 190
 191                 this->bpp = mlt_properties_get_int( this->properties, "bpp" );
 192
 193                 // Attach a colour space converter
 194                 if ( preview_off && !this->filtered )
 195                 {
 196                         mlt_filter filter = mlt_factory_filter( "avcolour_space", NULL );
 197                         mlt_properties_set_int( MLT_FILTER_PROPERTIES( filter ), "forced", mlt_image_yuv422 );
 198                         mlt_service_attach( MLT_CONSUMER_SERVICE( parent ), filter );
 199                         mlt_filter_close( filter );
 200                         this->filtered = 1;
 201                 }
 202
 203                 if ( sdl_started == 0 && display_off == 0 )
 204                 {
 205                         if ( SDL_Init( SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE ) < 0 )
 206                         {
 207                                 fprintf( stderr, "Failed to initialize SDL: %s\n", SDL_GetError() );
 208                                 return -1;
 209                         }
 210
 211                         SDL_EnableKeyRepeat( SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL );
 212                         SDL_EnableUNICODE( 1 );
 213                 }
 214                 else if ( display_off == 0 )
 215                 {
 216                         this->sdl_screen = SDL_GetVideoSurface( );
 217                 }
 218
 219                 if ( audio_off == 0 )
 220                         SDL_InitSubSystem( SDL_INIT_AUDIO );
 221
 222                 if ( this->sdl_screen == NULL && display_off == 0 )
 223                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, 0, this->sdl_flags );
 224
 225                 pthread_create( &this->thread, NULL, consumer_thread, this );
 226         }
 227
 228         return 0;
 229 }
 230
 231 int consumer_stop( mlt_consumer parent )
 232 {
 233         // Get the actual object
 234         consumer_sdl this = parent->child;
 235
 236         if ( this->joined == 0 )
 237         {
 238                 // Kill the thread and clean up
 239                 this->joined = 1;
 240                 this->running = 0;
 241                 pthread_join( this->thread, NULL );
 242
 243                 // internal cleanup
 244                 if ( this->sdl_overlay != NULL )
 245                         SDL_FreeYUVOverlay( this->sdl_overlay );
 246                 this->sdl_overlay = NULL;
 247
 248                 if ( !mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "audio_off" ) )
 249                         SDL_QuitSubSystem( SDL_INIT_AUDIO );
 250
 251                 if ( mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( parent ), "sdl_started" ) == 0 )
 252                         SDL_Quit( );
 253
 254                 this->sdl_screen = NULL;
 255         }
 256
 257         return 0;
 258 }
 259
 260 int consumer_is_stopped( mlt_consumer parent )
 261 {
 262         consumer_sdl this = parent->child;
 263         return !this->running;
 264 }
 265
 266 static int sdl_lock_display( )
 267 {
 268         SDL_Surface *screen = SDL_GetVideoSurface( );
 269         return screen != NULL && ( !SDL_MUSTLOCK( screen ) || SDL_LockSurface( screen ) >= 0 );
 270 }
 271
 272 static void sdl_unlock_display( )
 273 {
 274         SDL_Surface *screen = SDL_GetVideoSurface( );
 275         if ( screen != NULL && SDL_MUSTLOCK( screen ) )
 276                 SDL_UnlockSurface( screen );
 277 }
 278
 279 static void sdl_fill_audio( void *udata, uint8_t *stream, int len )
 280 {
 281         consumer_sdl this = udata;
 282
 283         // Get the volume
 284         double volume = mlt_properties_get_double( this->properties, "volume" );
 285
 286         pthread_mutex_lock( &this->audio_mutex );
 287
 288         // Block until audio received
 289         while ( this->running && len > this->audio_avail )
 290                 pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 291
 292         if ( this->audio_avail >= len )
 293         {
 294                 // Place in the audio buffer
 295                 if ( volume != 1.0 )
 296                         SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 297                 else
 298                         memcpy( stream, this->audio_buffer, len );
 299
 300                 // Remove len from the audio available
 301                 this->audio_avail -= len;
 302
 303                 // Remove the samples
 304                 memmove( this->audio_buffer, this->audio_buffer + len, this->audio_avail );
 305         }
 306         else
 307         {
 308                 // Just to be safe, wipe the stream first
 309                 memset( stream, 0, len );
 310
 311                 // Mix the audio
 312                 SDL_MixAudio( stream, this->audio_buffer, len, ( int )( ( float )SDL_MIX_MAXVOLUME * volume ) );
 313
 314                 // No audio left
 315                 this->audio_avail = 0;
 316         }
 317
 318         // We're definitely playing now
 319         this->playing = 1;
 320
 321         pthread_cond_broadcast( &this->audio_cond );
 322         pthread_mutex_unlock( &this->audio_mutex );
 323 }
 324
 325 static int consumer_play_audio( consumer_sdl this, mlt_frame frame, int init_audio, int *duration )
 326 {
 327         // Get the properties of this consumer
 328         mlt_properties properties = this->properties;
 329         mlt_audio_format afmt = mlt_audio_pcm;
 330
 331         // Set the preferred params of the test card signal
 332         int channels = mlt_properties_get_int( properties, "channels" );
 333         int frequency = mlt_properties_get_int( properties, "frequency" );
 334         static int counter = 0;
 335
 336         int samples = mlt_sample_calculator( mlt_properties_get_double( this->properties, "fps" ), frequency, counter++ );
 337
 338         int16_t *pcm;
 339         int bytes;
 340
 341         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 342         *duration = ( ( samples * 1000 ) / frequency );
 343
 344         if ( mlt_properties_get_int( properties, "audio_off" ) )
 345         {
 346                 this->playing = 1;
 347                 init_audio = 1;
 348                 return init_audio;
 349         }
 350
 351         if ( init_audio == 1 )
 352         {
 353                 SDL_AudioSpec request;
 354                 SDL_AudioSpec got;
 355
 356                 int audio_buffer = mlt_properties_get_int( properties, "audio_buffer" );
 357
 358                 // specify audio format
 359                 memset( &request, 0, sizeof( SDL_AudioSpec ) );
 360                 this->playing = 0;
 361                 request.freq = frequency;
 362                 request.format = AUDIO_S16SYS;
 363                 request.channels = channels;
 364                 request.samples = audio_buffer;
 365                 request.callback = sdl_fill_audio;
 366                 request.userdata = (void *)this;
 367                 if ( SDL_OpenAudio( &request, &got ) != 0 )
 368                 {
 369                         fprintf( stderr, "SDL failed to open audio: %s\n", SDL_GetError() );
 370                         init_audio = 2;
 371                 }
 372                 else if ( got.size != 0 )
 373                 {
 374                         SDL_PauseAudio( 0 );
 375                         init_audio = 0;
 376                 }
 377         }
 378
 379         if ( init_audio == 0 )
 380         {
 381                 mlt_properties properties = MLT_FRAME_PROPERTIES( frame );
 382                 bytes = ( samples * channels * 2 );
 383                 pthread_mutex_lock( &this->audio_mutex );
 384                 while ( this->running && bytes > ( sizeof( this->audio_buffer) - this->audio_avail ) )
 385                         pthread_cond_wait( &this->audio_cond, &this->audio_mutex );
 386                 if ( this->running )
 387                 {
 388                         if ( mlt_properties_get_double( properties, "_speed" ) == 1 )
 389                                 memcpy( &this->audio_buffer[ this->audio_avail ], pcm, bytes );
 390                         else
 391                                 memset( &this->audio_buffer[ this->audio_avail ], 0, bytes );
 392                         this->audio_avail += bytes;
 393                 }
 394                 pthread_cond_broadcast( &this->audio_cond );
 395                 pthread_mutex_unlock( &this->audio_mutex );
 396         }
 397         else
 398         {
 399                 this->playing = 1;
 400         }
 401
 402         return init_audio;
 403 }
 404
 405 static int consumer_play_video( consumer_sdl this, mlt_frame frame )
 406 {
 407         // Get the properties of this consumer
 408         mlt_properties properties = this->properties;
 409
 410         mlt_image_format vfmt = mlt_image_yuv422;
 411         int width = this->width, height = this->height;
 412         uint8_t *image;
 413         int changed = 0;
 414
 415         int video_off = mlt_properties_get_int( properties, "video_off" );
 416         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 417         mlt_image_format preview_format = mlt_properties_get_int( properties, "preview_format" );
 418         int display_off = video_off | preview_off;
 419
 420         if ( this->running && display_off == 0 )
 421         {
 422                 // Get the image, width and height
 423                 mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 424                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 425                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 426
 427                 // Handle events
 428                 if ( this->sdl_screen != NULL )
 429                 {
 430                         SDL_Event event;
 431
 432                         sdl_lock_display( );
 433                         changed = consumer_get_dimensions( &this->window_width, &this->window_height );
 434                         sdl_unlock_display( );
 435
 436                         while ( SDL_PollEvent( &event ) )
 437                         {
 438                                 mlt_events_fire( this->properties, "consumer-sdl-event", &event, NULL );
 439
 440                                 switch( event.type )
 441                                 {
 442                                         case SDL_VIDEORESIZE:
 443                                                 this->window_width = event.resize.w;
 444                                                 this->window_height = event.resize.h;
 445                                                 changed = 1;
 446                                                 break;
 447                                         case SDL_QUIT:
 448                                                 this->running = 0;
 449                                                 break;
 450                                         case SDL_KEYDOWN:
 451                                                 {
 452                                                         mlt_producer producer = mlt_properties_get_data( properties, "transport_producer", NULL );
 453                                                         char keyboard[ 2 ] = " ";
 454                                                         void (*callback)( mlt_producer, char * ) = mlt_properties_get_data( properties, "transport_callback", NULL );
 455                                                         if ( callback != NULL && producer != NULL && event.key.keysym.unicode < 0x80 && event.key.keysym.unicode > 0 )
 456                                                         {
 457                                                                 keyboard[ 0 ] = ( char )event.key.keysym.unicode;
 458                                                                 callback( producer, keyboard );
 459                                                         }
 460                                                 }
 461                                                 break;
 462                                 }
 463                         }
 464                 }
 465
 466                 sdl_lock_display();
 467
 468                 if ( width != this->width || height != this->height )
 469                 {
 470                         if ( this->sdl_overlay != NULL )
 471                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 472                         this->sdl_overlay = NULL;
 473                 }
 474
 475                 if ( this->running && ( this->sdl_screen == NULL || changed ) )
 476                 {
 477                         // Force an overlay recreation
 478                         if ( this->sdl_overlay != NULL )
 479                                 SDL_FreeYUVOverlay( this->sdl_overlay );
 480                         this->sdl_overlay = NULL;
 481
 482                         // open SDL window with video overlay, if possible
 483                         this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, this->bpp, this->sdl_flags );
 484                         if ( consumer_get_dimensions( &this->window_width, &this->window_height ) )
 485                                 this->sdl_screen = SDL_SetVideoMode( this->window_width, this->window_height, this->bpp, this->sdl_flags );
 486                 }
 487
 488                 if ( this->running )
 489                 {
 490                         // Determine window's new display aspect ratio
 491                         double this_aspect = ( double )this->window_width / this->window_height;
 492
 493                         // Get the display aspect ratio
 494                         double display_ratio = mlt_properties_get_double( properties, "display_ratio" );
 495
 496                         // Determine frame's display aspect ratio
 497                         double frame_aspect = mlt_frame_get_aspect_ratio( frame ) * width / height;
 498
 499                         // Store the width and height received
 500                         this->width = width;
 501                         this->height = height;
 502
 503                         // If using hardware scaler
 504                         if ( mlt_properties_get( properties, "rescale" ) != NULL &&
 505                                 !strcmp( mlt_properties_get( properties, "rescale" ), "none" ) )
 506                         {
 507                                 // Use hardware scaler to normalise display aspect ratio
 508                                 this->rect.w = frame_aspect / this_aspect * this->window_width;
 509                                 this->rect.h = this->window_height;
 510                                 if ( this->rect.w > this->window_width )
 511                                 {
 512                                         this->rect.w = this->window_width;
 513                                         this->rect.h = this_aspect / frame_aspect * this->window_height;
 514                                 }
 515                         }
 516                         // Special case optimisation to negate odd effect of sample aspect ratio
 517                         // not corresponding exactly with image resolution.
 518                         else if ( (int)( this_aspect * 1000 ) == (int)( display_ratio * 1000 ) )
 519                         {
 520                                 this->rect.w = this->window_width;
 521                                 this->rect.h = this->window_height;
 522                         }
 523                         // Use hardware scaler to normalise sample aspect ratio
 524                         else if ( this->window_height * display_ratio > this->window_width )
 525                         {
 526                                 this->rect.w = this->window_width;
 527                                 this->rect.h = this->window_width / display_ratio;
 528                         }
 529                         else
 530                         {
 531                                 this->rect.w = this->window_height * display_ratio;
 532                                 this->rect.h = this->window_height;
 533                         }
 534
 535                         this->rect.x = ( this->window_width - this->rect.w ) / 2;
 536                         this->rect.y = ( this->window_height - this->rect.h ) / 2;
 537
 538                         mlt_properties_set_int( this->properties, "rect_x", this->rect.x );
 539                         mlt_properties_set_int( this->properties, "rect_y", this->rect.y );
 540                         mlt_properties_set_int( this->properties, "rect_w", this->rect.w );
 541                         mlt_properties_set_int( this->properties, "rect_h", this->rect.h );
 542
 543                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 544                 }
 545
 546                 if ( this->running && this->sdl_screen != NULL && this->sdl_overlay == NULL )
 547                 {
 548                         SDL_SetClipRect( this->sdl_screen, &this->rect );
 549                         this->sdl_overlay = SDL_CreateYUVOverlay( width, height, SDL_YUY2_OVERLAY, this->sdl_screen );
 550                 }
 551
 552                 if ( this->running && this->sdl_screen != NULL && this->sdl_overlay != NULL )
 553                 {
 554                         this->buffer = this->sdl_overlay->pixels[ 0 ];
 555                         if ( SDL_LockYUVOverlay( this->sdl_overlay ) >= 0 )
 556                         {
 557                                 if ( image != NULL )
 558                                         memcpy( this->buffer, image, width * height * 2 );
 559                                 SDL_UnlockYUVOverlay( this->sdl_overlay );
 560                                 SDL_DisplayYUVOverlay( this->sdl_overlay, &this->sdl_screen->clip_rect );
 561                         }
 562                 }
 563
 564                 sdl_unlock_display();
 565         }
 566         else if ( this->running )
 567         {
 568                 vfmt = preview_format == mlt_image_none ? mlt_image_rgb24a : preview_format;
 569                 if ( !video_off )
 570                         mlt_frame_get_image( frame, &image, &vfmt, &width, &height, 0 );
 571                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "format", vfmt );
 572                 mlt_events_fire( properties, "consumer-frame-show", frame, NULL );
 573         }
 574
 575         return 0;
 576 }
 577
 578 static void *video_thread( void *arg )
 579 {
 580         // Identify the arg
 581         consumer_sdl this = arg;
 582
 583         // Obtain time of thread start
 584         struct timeval now;
 585         int64_t start = 0;
 586         int64_t elapsed = 0;
 587         struct timespec tm;
 588         mlt_frame next = NULL;
 589         mlt_properties properties = NULL;
 590         double speed = 0;
 591
 592         // Get real time flag
 593         int real_time = mlt_properties_get_int( this->properties, "real_time" );
 594
 595         // Get the current time
 596         gettimeofday( &now, NULL );
 597
 598         // Determine start time
 599         start = ( int64_t )now.tv_sec * 1000000 + now.tv_usec;
 600
 601         while ( this->running )
 602         {
 603                 // Pop the next frame
 604                 pthread_mutex_lock( &this->video_mutex );
 605                 next = mlt_deque_pop_front( this->queue );
 606                 while ( next == NULL && this->running )
 607                 {
 608                         pthread_cond_wait( &this->video_cond, &this->video_mutex );
 609                         next = mlt_deque_pop_front( this->queue );
 610                 }
 611                 pthread_mutex_unlock( &this->video_mutex );
 612
 613                 if ( !this->running || next == NULL ) break;
 614
 615                 // Get the properties
 616                 properties =  MLT_FRAME_PROPERTIES( next );
 617
 618                 // Get the speed of the frame
 619                 speed = mlt_properties_get_double( properties, "_speed" );
 620
 621                 // Get the current time
 622                 gettimeofday( &now, NULL );
 623
 624                 // Get the elapsed time
 625                 elapsed = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - start;
 626
 627                 // See if we have to delay the display of the current frame
 628                 if ( mlt_properties_get_int( properties, "rendered" ) == 1 && this->running )
 629                 {
 630                         // Obtain the scheduled playout time
 631                         int64_t scheduled = mlt_properties_get_int( properties, "playtime" );
 632
 633                         // Determine the difference between the elapsed time and the scheduled playout time
 634                         int64_t difference = scheduled - elapsed;
 635
 636                         // Smooth playback a bit
 637                         if ( real_time && ( difference > 20000 && speed == 1.0 ) )
 638                         {
 639                                 tm.tv_sec = difference / 1000000;
 640                                 tm.tv_nsec = ( difference % 1000000 ) * 500;
 641                                 nanosleep( &tm, NULL );
 642                         }
 643
 644                         // Show current frame if not too old
 645                         if ( !real_time || ( difference > -10000 || speed != 1.0 || mlt_deque_count( this->queue ) < 2 ) )
 646                                 consumer_play_video( this, next );
 647
 648                         // If the queue is empty, recalculate start to allow build up again
 649                         if ( real_time && ( mlt_deque_count( this->queue ) == 0 && speed == 1.0 ) )
 650                         {
 651                                 gettimeofday( &now, NULL );
 652                                 start = ( ( int64_t )now.tv_sec * 1000000 + now.tv_usec ) - scheduled + 20000;
 653                         }
 654                 }
 655
 656                 // This frame can now be closed
 657                 mlt_frame_close( next );
 658                 next = NULL;
 659         }
 660
 661         if ( next != NULL )
 662                 mlt_frame_close( next );
 663
 664         mlt_consumer_stopped( &this->parent );
 665
 666         return NULL;
 667 }
 668
 669 /** Threaded wrapper for pipe.
 670 */
 671
 672 static void *consumer_thread( void *arg )
 673 {
 674         // Identify the arg
 675         consumer_sdl this = arg;
 676
 677         // Get the consumer
 678         mlt_consumer consumer = &this->parent;
 679
 680         // Video thread
 681         pthread_t thread;
 682
 683         // internal intialization
 684         int init_audio = 1;
 685         int init_video = 1;
 686         mlt_frame frame = NULL;
 687         mlt_properties properties = NULL;
 688         int duration = 0;
 689         int64_t playtime = 0;
 690         struct timespec tm = { 0, 100000 };
 691
 692         // Loop until told not to
 693         while( this->running )
 694         {
 695                 // Get a frame from the attached producer
 696                 frame = mlt_consumer_rt_frame( consumer );
 697
 698                 // Ensure that we have a frame
 699                 if ( frame != NULL )
 700                 {
 701                         // Get the frame properties
 702                         properties =  MLT_FRAME_PROPERTIES( frame );
 703
 704                         // Play audio
 705                         init_audio = consumer_play_audio( this, frame, init_audio, &duration );
 706
 707                         // Determine the start time now
 708                         if ( this->playing && init_video )
 709                         {
 710                                 // Create the video thread
 711                                 pthread_create( &thread, NULL, video_thread, this );
 712
 713                                 // Video doesn't need to be initialised any more
 714                                 init_video = 0;
 715                         }
 716
 717                         // Set playtime for this frame
 718                         mlt_properties_set_int( properties, "playtime", playtime );
 719
 720                         while ( this->running && mlt_deque_count( this->queue ) > 15 )
 721                                 nanosleep( &tm, NULL );
 722
 723                         // Push this frame to the back of the queue
 724                         pthread_mutex_lock( &this->video_mutex );
 725                         mlt_deque_push_back( this->queue, frame );
 726                         pthread_cond_broadcast( &this->video_cond );
 727                         pthread_mutex_unlock( &this->video_mutex );
 728
 729                         // Calculate the next playtime
 730                         playtime += ( duration * 1000 );
 731                 }
 732         }
 733
 734         // Kill the video thread
 735         if ( init_video == 0 )
 736         {
 737                 pthread_mutex_lock( &this->video_mutex );
 738                 pthread_cond_broadcast( &this->video_cond );
 739                 pthread_mutex_unlock( &this->video_mutex );
 740                 pthread_join( thread, NULL );
 741         }
 742
 743         while( mlt_deque_count( this->queue ) )
 744                 mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 745
 746         this->sdl_screen = NULL;
 747         this->audio_avail = 0;
 748
 749         return NULL;
 750 }
 751
 752 static int consumer_get_dimensions( int *width, int *height )
 753 {
 754         int changed = 0;
 755
 756         // SDL windows manager structure
 757         SDL_SysWMinfo wm;
 758
 759         // Specify the SDL Version
 760         SDL_VERSION( &wm.version );
 761
 762         // Lock the display
 763         //sdl_lock_display();
 764
 765 #ifndef __DARWIN__
 766         // Get the wm structure
 767         if ( SDL_GetWMInfo( &wm ) == 1 )
 768         {
 769                 // Check that we have the X11 wm
 770                 if ( wm.subsystem == SDL_SYSWM_X11 )
 771                 {
 772                         // Get the SDL window
 773                         Window window = wm.info.x11.window;
 774
 775                         // Get the display session
 776                         Display *display = wm.info.x11.display;
 777
 778                         // Get the window attributes
 779                         XWindowAttributes attr;
 780                         XGetWindowAttributes( display, window, &attr );
 781
 782                         // Determine whether window has changed
 783                         changed = *width != attr.width || *height != attr.height;
 784
 785                         // Return width and height
 786                         *width = attr.width;
 787                         *height = attr.height;
 788                 }
 789         }
 790 #endif
 791
 792         // Unlock the display
 793         //sdl_unlock_display();
 794
 795         return changed;
 796 }
 797
 798 /** Callback to allow override of the close method.
 799 */
 800
 801 static void consumer_close( mlt_consumer parent )
 802 {
 803         // Get the actual object
 804         consumer_sdl this = parent->child;
 805
 806         // Stop the consumer
 807         ///mlt_consumer_stop( parent );
 808
 809         // Now clean up the rest
 810         mlt_consumer_close( parent );
 811
 812         // Close the queue
 813         mlt_deque_close( this->queue );
 814
 815         // Destroy mutexes
 816         pthread_mutex_destroy( &this->audio_mutex );
 817         pthread_cond_destroy( &this->audio_cond );
 818
 819         // Finally clean up this
 820         free( this );
 821 }