git.sesse.net Git - mlt/blob - src/framework/mlt_consumer.c

   1 /*
   2  * mlt_consumer.c -- abstraction for all consumer services
   3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
   4  * Author: Charles Yates <charles.yates@pandora.be>
   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 "config.h"
  22 #include "mlt_consumer.h"
  23 #include "mlt_factory.h"
  24 #include "mlt_producer.h"
  25 #include "mlt_frame.h"
  26 #include "mlt_profile.h"
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <sys/time.h>
  32
  33 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  34 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  35 static void mlt_consumer_property_changed( mlt_service owner, mlt_consumer this, char *name );
  36 static void apply_profile_properties( mlt_profile profile, mlt_properties properties );
  37
  38 static mlt_event g_event_listener = NULL;
  39
  40 /** Public final methods
  41 */
  42
  43 int mlt_consumer_init( mlt_consumer this, void *child )
  44 {
  45         int error = 0;
  46         memset( this, 0, sizeof( struct mlt_consumer_s ) );
  47         this->child = child;
  48         error = mlt_service_init( &this->parent, this );
  49         if ( error == 0 )
  50         {
  51                 // Get the properties from the service
  52                 mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
  53
  54                 // Apply the profile to properties for legacy integration
  55                 apply_profile_properties( mlt_profile_get(), properties );
  56
  57                 // Default rescaler for all consumers
  58                 mlt_properties_set( properties, "rescale", "bilinear" );
  59
  60                 // Default read ahead buffer size
  61                 mlt_properties_set_int( properties, "buffer", 25 );
  62
  63                 // Default audio frequency and channels
  64                 mlt_properties_set_int( properties, "frequency", 48000 );
  65                 mlt_properties_set_int( properties, "channels", 2 );
  66
  67                 // Default of all consumers is real time
  68                 mlt_properties_set_int( properties, "real_time", 1 );
  69
  70                 // Default to environment test card
  71                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
  72
  73                 // Hmm - default all consumers to yuv422 :-/
  74                 this->format = mlt_image_yuv422;
  75
  76                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
  77                 mlt_events_register( properties, "consumer-frame-render", ( mlt_transmitter )mlt_consumer_frame_render );
  78                 mlt_events_register( properties, "consumer-stopped", NULL );
  79
  80                 // Register a property-changed listener to handle the profile property -
  81                 // subsequent properties can override the profile
  82                 g_event_listener = mlt_events_listen( properties, this, "property-changed", ( mlt_listener )mlt_consumer_property_changed );
  83
  84                 // Create the push mutex and condition
  85                 pthread_mutex_init( &this->put_mutex, NULL );
  86                 pthread_cond_init( &this->put_cond, NULL );
  87
  88         }
  89         return error;
  90 }
  91
  92 static void apply_profile_properties( mlt_profile profile, mlt_properties properties )
  93 {
  94         mlt_event_block( g_event_listener );
  95         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
  96         mlt_properties_set_int( properties, "frame_rate_num", profile->frame_rate_num );
  97         mlt_properties_set_int( properties, "frame_rate_den", profile->frame_rate_den );
  98         mlt_properties_set_int( properties, "width", profile->width );
  99         mlt_properties_set_int( properties, "height", profile->height );
 100         mlt_properties_set_int( properties, "progressive", profile->progressive );
 101         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 102         mlt_properties_set_int( properties, "sample_aspect_num", profile->sample_aspect_num );
 103         mlt_properties_set_int( properties, "sample_aspect_den", profile->sample_aspect_den );
 104         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 105         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 106         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 107         mlt_event_unblock( g_event_listener );
 108 }
 109
 110 static void mlt_consumer_property_changed( mlt_service owner, mlt_consumer this, char *name )
 111 {
 112         if ( !strcmp( name, "profile" ) )
 113         {
 114                 // Get the properies
 115                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 116
 117                 // Locate the profile
 118                 mlt_profile_select( mlt_properties_get( properties, "profile" ) );
 119
 120                 // Apply to properties
 121                 apply_profile_properties( mlt_profile_get(), properties );
 122         }
 123         else if ( !strcmp( name, "frame_rate_num" ) )
 124         {
 125                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 126                 mlt_profile_get()->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 127                 mlt_properties_set_double( properties, "fps", mlt_profile_fps( NULL ) );
 128         }
 129         else if ( !strcmp( name, "frame_rate_den" ) )
 130         {
 131                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 132                 mlt_profile_get()->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 133                 mlt_properties_set_double( properties, "fps", mlt_profile_fps( NULL ) );
 134         }
 135         else if ( !strcmp( name, "width" ) )
 136         {
 137                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 138                 mlt_profile_get()->width = mlt_properties_get_int( properties, "width" );
 139         }
 140         else if ( !strcmp( name, "height" ) )
 141         {
 142                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 143                 mlt_profile_get()->height = mlt_properties_get_int( properties, "height" );
 144         }
 145         else if ( !strcmp( name, "progressive" ) )
 146         {
 147                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 148                 mlt_profile_get()->progressive = mlt_properties_get_int( properties, "progressive" );
 149         }
 150         else if ( !strcmp( name, "sample_aspect_num" ) )
 151         {
 152                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 153                 mlt_profile_get()->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 154                 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( NULL )  );
 155         }
 156         else if ( !strcmp( name, "sample_aspect_den" ) )
 157         {
 158                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 159                 mlt_profile_get()->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 160                 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( NULL )  );
 161         }
 162         else if ( !strcmp( name, "display_aspect_num" ) )
 163         {
 164                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 165                 mlt_profile_get()->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 166                 mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( NULL )  );
 167         }
 168         else if ( !strcmp( name, "display_aspect_den" ) )
 169         {
 170                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 171                 mlt_profile_get()->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 172                 mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( NULL )  );
 173         }
 174 }
 175
 176 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 177 {
 178         if ( listener != NULL )
 179                 listener( owner, this, ( mlt_frame )args[ 0 ] );
 180 }
 181
 182 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 183 {
 184         if ( listener != NULL )
 185                 listener( owner, this, ( mlt_frame )args[ 0 ] );
 186 }
 187
 188 /** Create a new consumer.
 189 */
 190
 191 mlt_consumer mlt_consumer_new( )
 192 {
 193         // Create the memory for the structure
 194         mlt_consumer this = malloc( sizeof( struct mlt_consumer_s ) );
 195
 196         // Initialise it
 197         if ( this != NULL )
 198                 mlt_consumer_init( this, NULL );
 199
 200         // Return it
 201         return this;
 202 }
 203
 204 /** Get the parent service object.
 205 */
 206
 207 mlt_service mlt_consumer_service( mlt_consumer this )
 208 {
 209         return this != NULL ? &this->parent : NULL;
 210 }
 211
 212 /** Get the consumer properties.
 213 */
 214
 215 mlt_properties mlt_consumer_properties( mlt_consumer this )
 216 {
 217         return this != NULL ? MLT_SERVICE_PROPERTIES( &this->parent ) : NULL;
 218 }
 219
 220 /** Connect the consumer to the producer.
 221 */
 222
 223 int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
 224 {
 225         return mlt_service_connect_producer( &this->parent, producer, 0 );
 226 }
 227
 228 /** Start the consumer.
 229 */
 230
 231 int mlt_consumer_start( mlt_consumer this )
 232 {
 233         // Stop listening to the property-changed event
 234         mlt_event_block( g_event_listener );
 235
 236         // Get the properies
 237         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 238
 239         // Determine if there's a test card producer
 240         char *test_card = mlt_properties_get( properties, "test_card" );
 241
 242         // Just to make sure nothing is hanging around...
 243         mlt_frame_close( this->put );
 244         this->put = NULL;
 245         this->put_active = 1;
 246
 247         // Deal with it now.
 248         if ( test_card != NULL )
 249         {
 250                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
 251                 {
 252                         // Create a test card producer
 253                         mlt_producer producer = mlt_factory_producer( NULL, test_card );
 254
 255                         // Do we have a producer
 256                         if ( producer != NULL )
 257                         {
 258                                 // Test card should loop I guess...
 259                                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
 260                                 //mlt_producer_set_speed( producer, 0 );
 261                                 //mlt_producer_set_in_and_out( producer, 0, 0 );
 262
 263                                 // Set the test card on the consumer
 264                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 265                         }
 266                 }
 267         }
 268         else
 269         {
 270                 // Allow the hash table to speed things up
 271                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 272         }
 273
 274         // Check and run an ante command
 275         if ( mlt_properties_get( properties, "ante" ) )
 276                 system( mlt_properties_get( properties, "ante" ) );
 277
 278         // Set the real_time preference
 279         this->real_time = mlt_properties_get_int( properties, "real_time" );
 280
 281         // Start the service
 282         if ( this->start != NULL )
 283                 return this->start( this );
 284
 285         return 0;
 286 }
 287
 288 /** An alternative method to feed frames into the consumer - only valid if
 289         the consumer itself is not connected.
 290 */
 291
 292 int mlt_consumer_put_frame( mlt_consumer this, mlt_frame frame )
 293 {
 294         int error = 1;
 295
 296         // Get the service assoicated to the consumer
 297         mlt_service service = MLT_CONSUMER_SERVICE( this );
 298
 299         if ( mlt_service_producer( service ) == NULL )
 300         {
 301                 struct timeval now;
 302                 struct timespec tm;
 303                 pthread_mutex_lock( &this->put_mutex );
 304                 while ( this->put_active && this->put != NULL )
 305                 {
 306                         gettimeofday( &now, NULL );
 307                         tm.tv_sec = now.tv_sec + 1;
 308                         tm.tv_nsec = now.tv_usec * 1000;
 309                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 310                 }
 311                 if ( this->put_active && this->put == NULL )
 312                         this->put = frame;
 313                 else
 314                         mlt_frame_close( frame );
 315                 pthread_cond_broadcast( &this->put_cond );
 316                 pthread_mutex_unlock( &this->put_mutex );
 317         }
 318         else
 319         {
 320                 mlt_frame_close( frame );
 321         }
 322
 323         return error;
 324 }
 325
 326 /** Protected method for consumer to get frames from connected service
 327 */
 328
 329 mlt_frame mlt_consumer_get_frame( mlt_consumer this )
 330 {
 331         // Frame to return
 332         mlt_frame frame = NULL;
 333
 334         // Get the service assoicated to the consumer
 335         mlt_service service = MLT_CONSUMER_SERVICE( this );
 336
 337         // Get the consumer properties
 338         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 339
 340         // Get the frame
 341         if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) )
 342         {
 343                 struct timeval now;
 344                 struct timespec tm;
 345                 pthread_mutex_lock( &this->put_mutex );
 346                 while ( this->put_active && this->put == NULL )
 347                 {
 348                         gettimeofday( &now, NULL );
 349                         tm.tv_sec = now.tv_sec + 1;
 350                         tm.tv_nsec = now.tv_usec * 1000;
 351                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 352                 }
 353                 frame = this->put;
 354                 this->put = NULL;
 355                 pthread_cond_broadcast( &this->put_cond );
 356                 pthread_mutex_unlock( &this->put_mutex );
 357                 if ( frame != NULL )
 358                         mlt_service_apply_filters( service, frame, 0 );
 359         }
 360         else if ( mlt_service_producer( service ) != NULL )
 361         {
 362                 mlt_service_get_frame( service, &frame, 0 );
 363         }
 364         else
 365         {
 366                 frame = mlt_frame_init( );
 367         }
 368
 369         if ( frame != NULL )
 370         {
 371                 // Get the frame properties
 372                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 373
 374                 // Get the test card producer
 375                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
 376
 377                 // Attach the test frame producer to it.
 378                 if ( test_card != NULL )
 379                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
 380
 381                 // Attach the rescale property
 382                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
 383
 384                 // Aspect ratio and other jiggery pokery
 385                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
 386                 mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "progressive" ) | mlt_properties_get_int( properties, "deinterlace" ) );
 387                 mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
 388         }
 389
 390         // Return the frame
 391         return frame;
 392 }
 393
 394 static inline long time_difference( struct timeval *time1 )
 395 {
 396         struct timeval time2;
 397         time2.tv_sec = time1->tv_sec;
 398         time2.tv_usec = time1->tv_usec;
 399         gettimeofday( time1, NULL );
 400         return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec;
 401 }
 402
 403 int mlt_consumer_profile( mlt_properties properties, char *profile )
 404 {
 405         mlt_profile p = mlt_profile_select( profile );
 406         if ( p )
 407         {
 408                 apply_profile_properties( p, properties );
 409                 return 1;
 410         }
 411         else
 412         {
 413                 return 0;
 414         }
 415 }
 416
 417 static void *consumer_read_ahead_thread( void *arg )
 418 {
 419         // The argument is the consumer
 420         mlt_consumer this = arg;
 421
 422         // Get the properties of the consumer
 423         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 424
 425         // Get the width and height
 426         int width = mlt_properties_get_int( properties, "width" );
 427         int height = mlt_properties_get_int( properties, "height" );
 428
 429         // See if video is turned off
 430         int video_off = mlt_properties_get_int( properties, "video_off" );
 431         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 432         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 433
 434         // Get the audio settings
 435         mlt_audio_format afmt = mlt_audio_pcm;
 436         int counter = 0;
 437         double fps = mlt_properties_get_double( properties, "fps" );
 438         int channels = mlt_properties_get_int( properties, "channels" );
 439         int frequency = mlt_properties_get_int( properties, "frequency" );
 440         int samples = 0;
 441         int16_t *pcm = NULL;
 442
 443         // See if audio is turned off
 444         int audio_off = mlt_properties_get_int( properties, "audio_off" );
 445
 446         // Get the maximum size of the buffer
 447         int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
 448
 449         // General frame variable
 450         mlt_frame frame = NULL;
 451         uint8_t *image = NULL;
 452
 453         // Time structures
 454         struct timeval ante;
 455
 456         // Average time for get_frame and get_image
 457         int count = 1;
 458         int skipped = 0;
 459         int64_t time_wait = 0;
 460         int64_t time_frame = 0;
 461         int64_t time_process = 0;
 462         int skip_next = 0;
 463         mlt_service lock_object = NULL;
 464
 465         if ( preview_off && preview_format != 0 )
 466                 this->format = preview_format;
 467
 468         // Get the first frame
 469         frame = mlt_consumer_get_frame( this );
 470
 471         // Get the lock object
 472         lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 473
 474         // Lock it
 475         if ( lock_object ) mlt_service_lock( lock_object );
 476
 477         // Get the image of the first frame
 478         if ( !video_off )
 479         {
 480                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 481                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 482         }
 483
 484         if ( !audio_off )
 485         {
 486                 samples = mlt_sample_calculator( fps, frequency, counter++ );
 487                 mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 488         }
 489
 490         // Unlock the lock object
 491         if ( lock_object ) mlt_service_unlock( lock_object );
 492
 493         // Mark as rendered
 494         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 495
 496         // Get the starting time (can ignore the times above)
 497         gettimeofday( &ante, NULL );
 498
 499         // Continue to read ahead
 500         while ( this->ahead )
 501         {
 502                 // Fetch width/height again
 503                 width = mlt_properties_get_int( properties, "width" );
 504                 height = mlt_properties_get_int( properties, "height" );
 505
 506                 // Put the current frame into the queue
 507                 pthread_mutex_lock( &this->mutex );
 508                 while( this->ahead && mlt_deque_count( this->queue ) >= buffer )
 509                         pthread_cond_wait( &this->cond, &this->mutex );
 510                 mlt_deque_push_back( this->queue, frame );
 511                 pthread_cond_broadcast( &this->cond );
 512                 pthread_mutex_unlock( &this->mutex );
 513
 514                 time_wait += time_difference( &ante );
 515
 516                 // Get the next frame
 517                 frame = mlt_consumer_get_frame( this );
 518                 time_frame += time_difference( &ante );
 519
 520                 // If there's no frame, we're probably stopped...
 521                 if ( frame == NULL )
 522                         continue;
 523
 524                 // Attempt to fetch the lock object
 525                 lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 526
 527                 // Increment the count
 528                 count ++;
 529
 530                 // Lock if there's a lock object
 531                 if ( lock_object ) mlt_service_lock( lock_object );
 532
 533                 // All non normal playback frames should be shown
 534                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 535                 {
 536                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 537                         skipped = 0;
 538                         time_frame = 0;
 539                         time_process = 0;
 540                         time_wait = 0;
 541                         count = 1;
 542                         skip_next = 0;
 543                 }
 544
 545                 // Get the image
 546                 if ( !skip_next )
 547                 {
 548                         // Get the image, mark as rendered and time it
 549                         if ( !video_off )
 550                         {
 551                                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 552                                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 553                         }
 554                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 555                 }
 556                 else
 557                 {
 558                         // Increment the number of sequentially skipped frames
 559                         skipped ++;
 560                         skip_next = 0;
 561
 562                         // If we've reached an unacceptable level, reset everything
 563                         if ( skipped > 5 )
 564                         {
 565                                 skipped = 0;
 566                                 time_frame = 0;
 567                                 time_process = 0;
 568                                 time_wait = 0;
 569                                 count = 1;
 570                         }
 571                 }
 572
 573                 // Always process audio
 574                 if ( !audio_off )
 575                 {
 576                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 577                         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
 578                 }
 579
 580                 // Increment the time take for this frame
 581                 time_process += time_difference( &ante );
 582
 583                 // Determine if the next frame should be skipped
 584                 if ( mlt_deque_count( this->queue ) <= 5 && ( ( time_wait + time_frame + time_process ) / count ) > 40000 )
 585                         skip_next = 1;
 586
 587                 // Unlock if there's a lock object
 588                 if ( lock_object ) mlt_service_unlock( lock_object );
 589         }
 590
 591         // Remove the last frame
 592         mlt_frame_close( frame );
 593
 594         return NULL;
 595 }
 596
 597 static void consumer_read_ahead_start( mlt_consumer this )
 598 {
 599         // We're running now
 600         this->ahead = 1;
 601
 602         // Create the frame queue
 603         this->queue = mlt_deque_init( );
 604
 605         // Create the mutex
 606         pthread_mutex_init( &this->mutex, NULL );
 607
 608         // Create the condition
 609         pthread_cond_init( &this->cond, NULL );
 610
 611         // Create the read ahead
 612         pthread_create( &this->ahead_thread, NULL, consumer_read_ahead_thread, this );
 613 }
 614
 615 static void consumer_read_ahead_stop( mlt_consumer this )
 616 {
 617         // Make sure we're running
 618         if ( this->ahead )
 619         {
 620                 // Inform thread to stop
 621                 this->ahead = 0;
 622
 623                 // Broadcast to the condition in case it's waiting
 624                 pthread_mutex_lock( &this->mutex );
 625                 pthread_cond_broadcast( &this->cond );
 626                 pthread_mutex_unlock( &this->mutex );
 627
 628                 // Broadcast to the put condition in case it's waiting
 629                 pthread_mutex_lock( &this->put_mutex );
 630                 pthread_cond_broadcast( &this->put_cond );
 631                 pthread_mutex_unlock( &this->put_mutex );
 632
 633                 // Join the thread
 634                 pthread_join( this->ahead_thread, NULL );
 635
 636                 // Destroy the mutex
 637                 pthread_mutex_destroy( &this->mutex );
 638
 639                 // Destroy the condition
 640                 pthread_cond_destroy( &this->cond );
 641
 642                 // Wipe the queue
 643                 while ( mlt_deque_count( this->queue ) )
 644                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 645
 646                 // Close the queue
 647                 mlt_deque_close( this->queue );
 648         }
 649 }
 650
 651 void mlt_consumer_purge( mlt_consumer this )
 652 {
 653         if ( this->ahead )
 654         {
 655                 pthread_mutex_lock( &this->mutex );
 656                 while ( mlt_deque_count( this->queue ) )
 657                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
 658                 pthread_cond_broadcast( &this->cond );
 659                 pthread_mutex_unlock( &this->mutex );
 660         }
 661 }
 662
 663 mlt_frame mlt_consumer_rt_frame( mlt_consumer this )
 664 {
 665         // Frame to return
 666         mlt_frame frame = NULL;
 667
 668         // Get the properties
 669         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 670
 671         // Check if the user has requested real time or not
 672         if ( this->real_time )
 673         {
 674                 int size = 1;
 675
 676                 // Is the read ahead running?
 677                 if ( this->ahead == 0 )
 678                 {
 679                         int buffer = mlt_properties_get_int( properties, "buffer" );
 680                         int prefill = mlt_properties_get_int( properties, "prefill" );
 681                         consumer_read_ahead_start( this );
 682                         if ( buffer > 1 )
 683                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
 684                 }
 685
 686                 // Get frame from queue
 687                 pthread_mutex_lock( &this->mutex );
 688                 while( this->ahead && mlt_deque_count( this->queue ) < size )
 689                         pthread_cond_wait( &this->cond, &this->mutex );
 690                 frame = mlt_deque_pop_front( this->queue );
 691                 pthread_cond_broadcast( &this->cond );
 692                 pthread_mutex_unlock( &this->mutex );
 693         }
 694         else
 695         {
 696                 // Get the frame in non real time
 697                 frame = mlt_consumer_get_frame( this );
 698
 699                 // This isn't true, but from the consumers perspective it is
 700                 if ( frame != NULL )
 701                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 702         }
 703
 704         return frame;
 705 }
 706
 707 /** Callback for the implementation to indicate a stopped condition.
 708 */
 709
 710 void mlt_consumer_stopped( mlt_consumer this )
 711 {
 712         mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( this ), "running", 0 );
 713         mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-stopped", NULL );
 714         mlt_event_unblock( g_event_listener );
 715 }
 716
 717 /** Stop the consumer.
 718 */
 719
 720 int mlt_consumer_stop( mlt_consumer this )
 721 {
 722         // Get the properies
 723         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 724         char *debug = mlt_properties_get( MLT_CONSUMER_PROPERTIES( this ), "debug" );
 725
 726         // Just in case...
 727         if ( debug ) fprintf( stderr, "%s: stopping put waiting\n", debug );
 728         pthread_mutex_lock( &this->put_mutex );
 729         this->put_active = 0;
 730         pthread_cond_broadcast( &this->put_cond );
 731         pthread_mutex_unlock( &this->put_mutex );
 732
 733         // Stop the consumer
 734         if ( debug ) fprintf( stderr, "%s: stopping consumer\n", debug );
 735         if ( this->stop != NULL )
 736                 this->stop( this );
 737
 738         // Check if the user has requested real time or not and stop if necessary
 739         if ( debug ) fprintf( stderr, "%s: stopping read_ahead\n", debug );
 740         if ( mlt_properties_get_int( properties, "real_time" ) )
 741                 consumer_read_ahead_stop( this );
 742
 743         // Kill the test card
 744         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 745
 746         // Check and run a post command
 747         if ( mlt_properties_get( properties, "post" ) )
 748                 system( mlt_properties_get( properties, "post" ) );
 749
 750         if ( debug ) fprintf( stderr, "%s: stopped\n", debug );
 751
 752         return 0;
 753 }
 754
 755 /** Determine if the consumer is stopped.
 756 */
 757
 758 int mlt_consumer_is_stopped( mlt_consumer this )
 759 {
 760         // Check if the consumer is stopped
 761         if ( this->is_stopped != NULL )
 762                 return this->is_stopped( this );
 763
 764         return 0;
 765 }
 766
 767 /** Close the consumer.
 768 */
 769
 770 void mlt_consumer_close( mlt_consumer this )
 771 {
 772         if ( this != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( this ) ) <= 0 )
 773         {
 774                 // Get the childs close function
 775                 void ( *consumer_close )( ) = this->close;
 776
 777                 if ( consumer_close )
 778                 {
 779                         // Just in case...
 780                         //mlt_consumer_stop( this );
 781
 782                         this->close = NULL;
 783                         consumer_close( this );
 784                 }
 785                 else
 786                 {
 787                         // Make sure it only gets called once
 788                         this->parent.close = NULL;
 789
 790                         // Destroy the push mutex and condition
 791                         pthread_mutex_destroy( &this->put_mutex );
 792                         pthread_cond_destroy( &this->put_cond );
 793
 794                         mlt_service_close( &this->parent );
 795                 }
 796         }
 797 }