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

   1 /**
   2  * \file mlt_consumer.c
   3  * \brief abstraction for all consumer services
   4  * \see mlt_consumer_s
   5  *
   6  * Copyright (C) 2003-2009 Ushodaya Enterprises Limited
   7  * \author Charles Yates <charles.yates@pandora.be>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24 #include "mlt_consumer.h"
  25 #include "mlt_factory.h"
  26 #include "mlt_producer.h"
  27 #include "mlt_frame.h"
  28 #include "mlt_profile.h"
  29 #include "mlt_log.h"
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <stdlib.h>
  34 #include <sys/time.h>
  35
  36 /** Define this if you want an automatic deinterlace (if necessary) when the
  37  * consumer's producer is not running at normal speed.
  38  */
  39 #undef DEINTERLACE_ON_NOT_NORMAL_SPEED
  40
  41 /** This is not the ideal place for this, but it is needed by VDPAU as well.
  42  */
  43 pthread_mutex_t mlt_sdl_mutex = PTHREAD_MUTEX_INITIALIZER;
  44
  45 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  46 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
  47 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer this, char *name );
  48 static void apply_profile_properties( mlt_consumer this, mlt_profile profile, mlt_properties properties );
  49 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer this, mlt_frame frame );
  50
  51 /** Initialize a consumer service.
  52  *
  53  * \public \memberof mlt_consumer_s
  54  * \param this the consumer to initialize
  55  * \param child a pointer to the object for the subclass
  56  * \param profile the \p mlt_profile_s to use (optional but recommended,
  57  * uses the environment variable MLT if this is NULL)
  58  * \return true if there was an error
  59  */
  60
  61 int mlt_consumer_init( mlt_consumer this, void *child, mlt_profile profile )
  62 {
  63         int error = 0;
  64         memset( this, 0, sizeof( struct mlt_consumer_s ) );
  65         this->child = child;
  66         error = mlt_service_init( &this->parent, this );
  67         if ( error == 0 )
  68         {
  69                 // Get the properties from the service
  70                 mlt_properties properties = MLT_SERVICE_PROPERTIES( &this->parent );
  71
  72                 // Apply profile to properties
  73                 if ( profile == NULL )
  74                 {
  75                         // Normally the application creates the profile and controls its lifetime
  76                         // This is the fallback exception handling
  77                         profile = mlt_profile_init( NULL );
  78                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
  79                         mlt_properties_set_data( properties, "_profile", profile, 0, (mlt_destructor)mlt_profile_close, NULL );
  80                 }
  81                 apply_profile_properties( this, profile, properties );
  82
  83                 // Default rescaler for all consumers
  84                 mlt_properties_set( properties, "rescale", "bilinear" );
  85
  86                 // Default read ahead buffer size
  87                 mlt_properties_set_int( properties, "buffer", 25 );
  88
  89                 // Default audio frequency and channels
  90                 mlt_properties_set_int( properties, "frequency", 48000 );
  91                 mlt_properties_set_int( properties, "channels", 2 );
  92
  93                 // Default of all consumers is real time
  94                 mlt_properties_set_int( properties, "real_time", 1 );
  95
  96                 // Default to environment test card
  97                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
  98
  99                 // Hmm - default all consumers to yuv422 :-/
 100                 this->format = mlt_image_yuv422;
 101
 102                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
 103                 mlt_events_register( properties, "consumer-frame-render", ( mlt_transmitter )mlt_consumer_frame_render );
 104                 mlt_events_register( properties, "consumer-stopped", NULL );
 105                 mlt_events_listen( properties, this, "consumer-frame-show", ( mlt_listener )on_consumer_frame_show );
 106
 107                 // Register a property-changed listener to handle the profile property -
 108                 // subsequent properties can override the profile
 109                 this->event_listener = mlt_events_listen( properties, this, "property-changed", ( mlt_listener )mlt_consumer_property_changed );
 110
 111                 // Create the push mutex and condition
 112                 pthread_mutex_init( &this->put_mutex, NULL );
 113                 pthread_cond_init( &this->put_cond, NULL );
 114
 115         }
 116         return error;
 117 }
 118
 119 /** Convert the profile into properties on the consumer.
 120  *
 121  * \private \memberof mlt_consumer_s
 122  * \param this a consumer
 123  * \param profile a profile
 124  * \param properties a properties list (typically, the consumer's)
 125  */
 126
 127 static void apply_profile_properties( mlt_consumer this, mlt_profile profile, mlt_properties properties )
 128 {
 129         mlt_event_block( this->event_listener );
 130         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 131         mlt_properties_set_int( properties, "frame_rate_num", profile->frame_rate_num );
 132         mlt_properties_set_int( properties, "frame_rate_den", profile->frame_rate_den );
 133         mlt_properties_set_int( properties, "width", profile->width );
 134         mlt_properties_set_int( properties, "height", profile->height );
 135         mlt_properties_set_int( properties, "progressive", profile->progressive );
 136         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 137         mlt_properties_set_int( properties, "sample_aspect_num", profile->sample_aspect_num );
 138         mlt_properties_set_int( properties, "sample_aspect_den", profile->sample_aspect_den );
 139         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 140         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 141         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 142         mlt_properties_set_int( properties, "colorspace", profile->colorspace );
 143         mlt_event_unblock( this->event_listener );
 144 }
 145
 146 /** The property-changed event listener
 147  *
 148  * \private \memberof mlt_consumer_s
 149  * \param owner the events object
 150  * \param this the consumer
 151  * \param name the name of the property that changed
 152  */
 153
 154 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer this, char *name )
 155 {
 156         if ( !strcmp( name, "profile" ) )
 157         {
 158                 // Get the properies
 159                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 160
 161                 // Get the current profile
 162                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 163
 164                 // Load the new profile
 165                 mlt_profile new_profile = mlt_profile_init( mlt_properties_get( properties, name ) );
 166
 167                 if ( new_profile )
 168                 {
 169                         // Copy the profile
 170                         if ( profile != NULL )
 171                         {
 172                                 free( profile->description );
 173                                 memcpy( profile, new_profile, sizeof( struct mlt_profile_s ) );
 174                                 profile->description = strdup( new_profile->description );
 175                                 mlt_profile_close( new_profile );
 176                         }
 177                         else
 178                         {
 179                                 profile = new_profile;
 180                         }
 181
 182                         // Apply to properties
 183                         apply_profile_properties( this, profile, properties );
 184                 }
 185         }
 186         else if ( !strcmp( name, "frame_rate_num" ) )
 187         {
 188                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 189                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 190                 if ( profile )
 191                 {
 192                         profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 193                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 194                 }
 195         }
 196         else if ( !strcmp( name, "frame_rate_den" ) )
 197         {
 198                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 199                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 200                 if ( profile )
 201                 {
 202                         profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 203                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 204                 }
 205         }
 206         else if ( !strcmp( name, "width" ) )
 207         {
 208                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 209                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 210                 if ( profile )
 211                         profile->width = mlt_properties_get_int( properties, "width" );
 212         }
 213         else if ( !strcmp( name, "height" ) )
 214         {
 215                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 216                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 217                 if ( profile )
 218                         profile->height = mlt_properties_get_int( properties, "height" );
 219         }
 220         else if ( !strcmp( name, "progressive" ) )
 221         {
 222                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 223                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 224                 if ( profile )
 225                         profile->progressive = mlt_properties_get_int( properties, "progressive" );
 226         }
 227         else if ( !strcmp( name, "sample_aspect_num" ) )
 228         {
 229                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 230                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 231                 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 232                 if ( profile )
 233                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 234         }
 235         else if ( !strcmp( name, "sample_aspect_den" ) )
 236         {
 237                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 238                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 239                 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 240                 if ( profile )
 241                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 242         }
 243         else if ( !strcmp( name, "display_aspect_num" ) )
 244         {
 245                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 246                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 247                 if ( profile )
 248                 {
 249                         profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 250                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 251                 }
 252         }
 253         else if ( !strcmp( name, "display_aspect_den" ) )
 254         {
 255                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 256                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 257                 if ( profile )
 258                 {
 259                         profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 260                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 261                 }
 262         }
 263         else if ( !strcmp( name, "colorspace" ) )
 264         {
 265                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 266                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 267                 if ( profile )
 268                         profile->colorspace = mlt_properties_get_int( properties, "colorspace" );
 269         }
 270 }
 271
 272 /** The transmitter for the consumer-frame-show event
 273  *
 274  * Invokes the listener.
 275  *
 276  * \private \memberof mlt_consumer_s
 277  * \param listener a function pointer that will be invoked
 278  * \param owner the events object that will be passed to \p listener
 279  * \param this  a service that will be passed to \p listener
 280  * \param args an array of pointers - the first entry is passed as a string to \p listener
 281  */
 282
 283 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 284 {
 285         if ( listener != NULL )
 286                 listener( owner, this, ( mlt_frame )args[ 0 ] );
 287 }
 288
 289 /** The transmitter for the consumer-frame-render event
 290  *
 291  * Invokes the listener.
 292  *
 293  * \private \memberof mlt_consumer_s
 294  * \param listener a function pointer that will be invoked
 295  * \param owner the events object that will be passed to \p listener
 296  * \param this  a service that will be passed to \p listener
 297  * \param args an array of pointers - the first entry is passed as a string to \p listener
 298  */
 299
 300 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
 301 {
 302         if ( listener != NULL )
 303                 listener( owner, this, ( mlt_frame )args[ 0 ] );
 304 }
 305
 306 /** A listener on the consumer-frame-show event
 307  *
 308  * Saves the position of the frame shown.
 309  *
 310  * \private \memberof mlt_consumer_s
 311  * \param owner the events object
 312  * \param consumer the consumer on which this event occurred
 313  * \param frame the frame that was shown
 314  */
 315
 316 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer consumer, mlt_frame frame )
 317 {
 318         if ( frame )
 319                 consumer->position = mlt_frame_get_position( frame );
 320 }
 321
 322 /** Create a new consumer.
 323  *
 324  * \public \memberof mlt_consumer_s
 325  * \param profile a profile (optional, but recommended)
 326  * \return a new consumer
 327  */
 328
 329 mlt_consumer mlt_consumer_new( mlt_profile profile )
 330 {
 331         // Create the memory for the structure
 332         mlt_consumer this = malloc( sizeof( struct mlt_consumer_s ) );
 333
 334         // Initialise it
 335         if ( this != NULL )
 336                 mlt_consumer_init( this, NULL, profile );
 337
 338         // Return it
 339         return this;
 340 }
 341
 342 /** Get the parent service object.
 343  *
 344  * \public \memberof mlt_consumer_s
 345  * \param this a consumer
 346  * \return the parent service class
 347  * \see MLT_CONSUMER_SERVICE
 348  */
 349
 350 mlt_service mlt_consumer_service( mlt_consumer this )
 351 {
 352         return this != NULL ? &this->parent : NULL;
 353 }
 354
 355 /** Get the consumer properties.
 356  *
 357  * \public \memberof mlt_consumer_s
 358  * \param this a consumer
 359  * \return the consumer's properties list
 360  * \see MLT_CONSUMER_PROPERTIES
 361  */
 362
 363 mlt_properties mlt_consumer_properties( mlt_consumer this )
 364 {
 365         return this != NULL ? MLT_SERVICE_PROPERTIES( &this->parent ) : NULL;
 366 }
 367
 368 /** Connect the consumer to the producer.
 369  *
 370  * \public \memberof mlt_consumer_s
 371  * \param this a consumer
 372  * \param producer a producer
 373  * \return > 0 warning, == 0 success, < 0 serious error,
 374  *         1 = this service does not accept input,
 375  *         2 = the producer is invalid,
 376  *         3 = the producer is already registered with this consumer
 377  */
 378
 379 int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
 380 {
 381         return mlt_service_connect_producer( &this->parent, producer, 0 );
 382 }
 383
 384 /** Start the consumer.
 385  *
 386  * \public \memberof mlt_consumer_s
 387  * \param this a consumer
 388  * \return true if there was an error
 389  */
 390
 391 int mlt_consumer_start( mlt_consumer this )
 392 {
 393         // Stop listening to the property-changed event
 394         mlt_event_block( this->event_listener );
 395
 396         // Get the properies
 397         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 398
 399         // Determine if there's a test card producer
 400         char *test_card = mlt_properties_get( properties, "test_card" );
 401
 402         // Just to make sure nothing is hanging around...
 403         mlt_frame_close( this->put );
 404         this->put = NULL;
 405         this->put_active = 1;
 406
 407         // Deal with it now.
 408         if ( test_card != NULL )
 409         {
 410                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
 411                 {
 412                         // Create a test card producer
 413                         mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( this ) );
 414                         mlt_producer producer = mlt_factory_producer( profile, NULL, test_card );
 415
 416                         // Do we have a producer
 417                         if ( producer != NULL )
 418                         {
 419                                 // Test card should loop I guess...
 420                                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
 421                                 //mlt_producer_set_speed( producer, 0 );
 422                                 //mlt_producer_set_in_and_out( producer, 0, 0 );
 423
 424                                 // Set the test card on the consumer
 425                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 426                         }
 427                 }
 428         }
 429         else
 430         {
 431                 // Allow the hash table to speed things up
 432                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 433         }
 434
 435         // Set the frame duration in microseconds for the frame-dropping heuristic
 436         int frame_duration = 1000000 / mlt_properties_get_int( properties, "frame_rate_num" ) *
 437                         mlt_properties_get_int( properties, "frame_rate_den" );
 438         mlt_properties_set_int( properties, "frame_duration", frame_duration );
 439
 440         // Check and run an ante command
 441         if ( mlt_properties_get( properties, "ante" ) )
 442                 if ( system( mlt_properties_get( properties, "ante" ) ) == -1 )
 443                         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "ante" ) );
 444
 445         // Set the real_time preference
 446         this->real_time = mlt_properties_get_int( properties, "real_time" );
 447
 448         // For worker threads implementation, buffer must be at least # threads
 449         if ( abs( this->real_time ) > 1 && mlt_properties_get_int( properties, "buffer" ) <= abs( this->real_time ) )
 450                 mlt_properties_set_int( properties, "buffer", abs( this->real_time ) + 1 );
 451
 452         // Start the service
 453         if ( this->start != NULL )
 454                 return this->start( this );
 455
 456         return 0;
 457 }
 458
 459 /** An alternative method to feed frames into the consumer.
 460  *
 461  * Only valid if the consumer itself is not connected.
 462  *
 463  * \public \memberof mlt_consumer_s
 464  * \param this a consumer
 465  * \param frame a frame
 466  * \return true (ignore this for now)
 467  */
 468
 469 int mlt_consumer_put_frame( mlt_consumer this, mlt_frame frame )
 470 {
 471         int error = 1;
 472
 473         // Get the service assoicated to the consumer
 474         mlt_service service = MLT_CONSUMER_SERVICE( this );
 475
 476         if ( mlt_service_producer( service ) == NULL )
 477         {
 478                 struct timeval now;
 479                 struct timespec tm;
 480                 pthread_mutex_lock( &this->put_mutex );
 481                 while ( this->put_active && this->put != NULL )
 482                 {
 483                         gettimeofday( &now, NULL );
 484                         tm.tv_sec = now.tv_sec + 1;
 485                         tm.tv_nsec = now.tv_usec * 1000;
 486                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 487                 }
 488                 if ( this->put_active && this->put == NULL )
 489                         this->put = frame;
 490                 else
 491                         mlt_frame_close( frame );
 492                 pthread_cond_broadcast( &this->put_cond );
 493                 pthread_mutex_unlock( &this->put_mutex );
 494         }
 495         else
 496         {
 497                 mlt_frame_close( frame );
 498         }
 499
 500         return error;
 501 }
 502
 503 /** Protected method for consumer to get frames from connected service
 504  *
 505  * \public \memberof mlt_consumer_s
 506  * \param this a consumer
 507  * \return a frame
 508  */
 509
 510 mlt_frame mlt_consumer_get_frame( mlt_consumer this )
 511 {
 512         // Frame to return
 513         mlt_frame frame = NULL;
 514
 515         // Get the service assoicated to the consumer
 516         mlt_service service = MLT_CONSUMER_SERVICE( this );
 517
 518         // Get the consumer properties
 519         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 520
 521         // Get the frame
 522         if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) )
 523         {
 524                 struct timeval now;
 525                 struct timespec tm;
 526                 pthread_mutex_lock( &this->put_mutex );
 527                 while ( this->put_active && this->put == NULL )
 528                 {
 529                         gettimeofday( &now, NULL );
 530                         tm.tv_sec = now.tv_sec + 1;
 531                         tm.tv_nsec = now.tv_usec * 1000;
 532                         pthread_cond_timedwait( &this->put_cond, &this->put_mutex, &tm );
 533                 }
 534                 frame = this->put;
 535                 this->put = NULL;
 536                 pthread_cond_broadcast( &this->put_cond );
 537                 pthread_mutex_unlock( &this->put_mutex );
 538                 if ( frame != NULL )
 539                         mlt_service_apply_filters( service, frame, 0 );
 540         }
 541         else if ( mlt_service_producer( service ) != NULL )
 542         {
 543                 mlt_service_get_frame( service, &frame, 0 );
 544         }
 545         else
 546         {
 547                 frame = mlt_frame_init( service );
 548         }
 549
 550         if ( frame != NULL )
 551         {
 552                 // Get the frame properties
 553                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 554
 555                 // Get the test card producer
 556                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
 557
 558                 // Attach the test frame producer to it.
 559                 if ( test_card != NULL )
 560                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
 561
 562                 // Attach the rescale property
 563                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
 564
 565                 // Aspect ratio and other jiggery pokery
 566                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
 567                 mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "progressive" ) | mlt_properties_get_int( properties, "deinterlace" ) );
 568                 mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
 569         }
 570
 571         // Return the frame
 572         return frame;
 573 }
 574
 575 /** Compute the time difference between now and a time value.
 576  *
 577  * \private \memberof mlt_consumer_s
 578  * \param time1 a time value to be compared against now
 579  * \return the difference in microseconds
 580  */
 581
 582 static inline long time_difference( struct timeval *time1 )
 583 {
 584         struct timeval time2;
 585         time2.tv_sec = time1->tv_sec;
 586         time2.tv_usec = time1->tv_usec;
 587         gettimeofday( time1, NULL );
 588         return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec;
 589 }
 590
 591 /** The thread procedure for asynchronously pulling frames through the service
 592  * network connected to a consumer.
 593  *
 594  * \private \memberof mlt_consumer_s
 595  * \param arg a consumer
 596  */
 597
 598 static void *consumer_read_ahead_thread( void *arg )
 599 {
 600         // The argument is the consumer
 601         mlt_consumer this = arg;
 602
 603         // Get the properties of the consumer
 604         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 605
 606         // Get the width and height
 607         int width = mlt_properties_get_int( properties, "width" );
 608         int height = mlt_properties_get_int( properties, "height" );
 609
 610         // See if video is turned off
 611         int video_off = mlt_properties_get_int( properties, "video_off" );
 612         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 613         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 614
 615         // Get the audio settings
 616         mlt_audio_format afmt = mlt_audio_s16;
 617         int counter = 0;
 618         double fps = mlt_properties_get_double( properties, "fps" );
 619         int channels = mlt_properties_get_int( properties, "channels" );
 620         int frequency = mlt_properties_get_int( properties, "frequency" );
 621         int samples = 0;
 622         void *audio = NULL;
 623
 624         // See if audio is turned off
 625         int audio_off = mlt_properties_get_int( properties, "audio_off" );
 626
 627         // Get the maximum size of the buffer
 628         int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
 629
 630         // General frame variable
 631         mlt_frame frame = NULL;
 632         uint8_t *image = NULL;
 633
 634         // Time structures
 635         struct timeval ante;
 636
 637         // Average time for get_frame and get_image
 638         int count = 1;
 639         int skipped = 0;
 640         int64_t time_wait = 0;
 641         int64_t time_frame = 0;
 642         int64_t time_process = 0;
 643         int skip_next = 0;
 644         mlt_service lock_object = NULL;
 645
 646         if ( preview_off && preview_format != 0 )
 647                 this->format = preview_format;
 648
 649         // Get the first frame
 650         frame = mlt_consumer_get_frame( this );
 651
 652         // Get the lock object
 653         lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 654
 655         // Lock it
 656         if ( lock_object ) mlt_service_lock( lock_object );
 657
 658         // Get the image of the first frame
 659         if ( !video_off )
 660         {
 661                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 662                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 663         }
 664
 665         if ( !audio_off )
 666         {
 667                 samples = mlt_sample_calculator( fps, frequency, counter++ );
 668                 mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 669         }
 670
 671         // Unlock the lock object
 672         if ( lock_object ) mlt_service_unlock( lock_object );
 673
 674         // Mark as rendered
 675         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 676
 677         // Get the starting time (can ignore the times above)
 678         gettimeofday( &ante, NULL );
 679
 680         // Continue to read ahead
 681         while ( this->ahead )
 682         {
 683                 // Fetch width/height again
 684                 width = mlt_properties_get_int( properties, "width" );
 685                 height = mlt_properties_get_int( properties, "height" );
 686
 687                 // Put the current frame into the queue
 688                 pthread_mutex_lock( &this->frame_queue_mutex );
 689                 while( this->ahead && mlt_deque_count( this->frame_queue ) >= buffer )
 690                         pthread_cond_wait( &this->frame_queue_cond, &this->frame_queue_mutex );
 691                 mlt_deque_push_back( this->frame_queue, frame );
 692                 pthread_cond_broadcast( &this->frame_queue_cond );
 693                 pthread_mutex_unlock( &this->frame_queue_mutex );
 694
 695                 time_wait += time_difference( &ante );
 696
 697                 // Get the next frame
 698                 frame = mlt_consumer_get_frame( this );
 699                 time_frame += time_difference( &ante );
 700
 701                 // If there's no frame, we're probably stopped...
 702                 if ( frame == NULL )
 703                         continue;
 704
 705                 // Attempt to fetch the lock object
 706                 lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 707
 708                 // Increment the count
 709                 count ++;
 710
 711                 // Lock if there's a lock object
 712                 if ( lock_object ) mlt_service_lock( lock_object );
 713
 714                 // All non normal playback frames should be shown
 715                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 716                 {
 717 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 718                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 719 #endif
 720                         skipped = 0;
 721                         time_frame = 0;
 722                         time_process = 0;
 723                         time_wait = 0;
 724                         count = 1;
 725                         skip_next = 0;
 726                 }
 727
 728                 // Get the image
 729                 if ( !skip_next || this->real_time == -1 )
 730                 {
 731                         // Get the image, mark as rendered and time it
 732                         if ( !video_off )
 733                         {
 734                                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 735                                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 736                         }
 737                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 738                 }
 739                 else
 740                 {
 741                         // Increment the number of sequentially skipped frames
 742                         skipped ++;
 743                         skip_next = 0;
 744
 745                         // If we've reached an unacceptable level, reset everything
 746                         if ( skipped > 5 )
 747                         {
 748                                 skipped = 0;
 749                                 time_frame = 0;
 750                                 time_process = 0;
 751                                 time_wait = 0;
 752                                 count = 1;
 753                         }
 754                 }
 755
 756                 // Always process audio
 757                 if ( !audio_off )
 758                 {
 759                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 760                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 761                 }
 762
 763                 // Increment the time take for this frame
 764                 time_process += time_difference( &ante );
 765
 766                 // Determine if the next frame should be skipped
 767                 if ( mlt_deque_count( this->frame_queue ) <= 5 )
 768                 {
 769                         int frame_duration = mlt_properties_get_int( properties, "frame_duration" );
 770                         if ( ( ( time_wait + time_frame + time_process ) / count ) > frame_duration )
 771                                 skip_next = 1;
 772                 }
 773
 774                 // Unlock if there's a lock object
 775                 if ( lock_object ) mlt_service_unlock( lock_object );
 776         }
 777
 778         // Remove the last frame
 779         mlt_frame_close( frame );
 780
 781         return NULL;
 782 }
 783
 784 static int compare_frame_position( mlt_frame a, mlt_frame b )
 785 {
 786         return mlt_frame_get_position( a ) - mlt_frame_get_position( b );
 787 }
 788
 789 /** The worker thread procedure for parallel processing frames.
 790  *
 791  * \private \memberof mlt_consumer_s
 792  * \param arg a consumer
 793  */
 794
 795 static void *consumer_worker_thread( void *arg )
 796 {
 797         // The argument is the consumer
 798         mlt_consumer this = arg;
 799
 800         // Get the properties of the consumer
 801         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
 802
 803         // Get the width and height
 804         int width = mlt_properties_get_int( properties, "width" );
 805         int height = mlt_properties_get_int( properties, "height" );
 806
 807         // See if video is turned off
 808         int video_off = mlt_properties_get_int( properties, "video_off" );
 809         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 810         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 811
 812         // Get the audio settings
 813         mlt_audio_format afmt = mlt_audio_s16;
 814         int counter = 0;
 815         double fps = mlt_properties_get_double( properties, "fps" );
 816         int channels = mlt_properties_get_int( properties, "channels" );
 817         int frequency = mlt_properties_get_int( properties, "frequency" );
 818         int samples = 0;
 819         void *audio = NULL;
 820
 821         // See if audio is turned off
 822         int audio_off = mlt_properties_get_int( properties, "audio_off" );
 823
 824         // Get the maximum size of the buffer
 825         int buffer = mlt_properties_get_int( properties, "buffer" );
 826
 827         // General frame variable
 828         mlt_frame frame = NULL;
 829         uint8_t *image = NULL;
 830         mlt_service lock_object = NULL;
 831
 832         if ( preview_off && preview_format != 0 )
 833                 this->format = preview_format;
 834
 835         // Get the first frame
 836         frame = mlt_consumer_get_frame( this );
 837
 838         // Get the lock object
 839         lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 840
 841         // Lock it
 842         if ( lock_object ) mlt_service_lock( lock_object );
 843
 844         // Get the image of the first frame
 845         if ( !video_off )
 846         {
 847                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 848                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 849         }
 850
 851         if ( !audio_off )
 852         {
 853                 samples = mlt_sample_calculator( fps, frequency, counter++ );
 854                 mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 855         }
 856
 857         // Unlock the lock object
 858         if ( lock_object ) mlt_service_unlock( lock_object );
 859
 860         // Mark as rendered
 861         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 862
 863         // Continue to read ahead
 864         while ( this->ahead )
 865         {
 866                 // Fetch width/height again
 867                 width = mlt_properties_get_int( properties, "width" );
 868                 height = mlt_properties_get_int( properties, "height" );
 869
 870                 // Put the processed frame into the done queue
 871                 if ( frame )
 872                 {
 873                         pthread_mutex_lock( &this->done_queue_mutex );
 874                         mlt_deque_insert( this->done_queue, frame, ( mlt_deque_compare ) compare_frame_position );
 875                         pthread_mutex_unlock( &this->done_queue_mutex );
 876                         pthread_cond_broadcast( &this->done_queue_cond );
 877                 }
 878
 879                 pthread_mutex_lock( &this->done_queue_mutex );
 880                 while ( this->ahead && mlt_deque_count( this->done_queue ) >= buffer )
 881                         pthread_cond_wait( &this->done_queue_cond, &this->done_queue_mutex );
 882                 pthread_mutex_unlock( &this->done_queue_mutex );
 883
 884                 // Get the next frame
 885                 frame = mlt_consumer_get_frame( this );
 886
 887                 // If there's no frame, we're probably stopped...
 888                 if ( frame == NULL )
 889                         continue;
 890
 891                 // Attempt to fetch the lock object
 892                 lock_object = mlt_properties_get_data( MLT_FRAME_PROPERTIES( frame ), "consumer_lock_service", NULL );
 893
 894                 // Lock if there's a lock object
 895                 if ( lock_object ) mlt_service_lock( lock_object );
 896
 897                 // All non normal playback frames should be shown
 898                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 899                 {
 900 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 901                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 902 #endif
 903                 }
 904
 905                 // Get the image
 906                 if ( !video_off )
 907                 {
 908                         mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-frame-render", frame, NULL );
 909                         mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
 910                 }
 911                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 912
 913                 // Always process audio
 914                 if ( !audio_off )
 915                 {
 916                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 917                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 918                 }
 919
 920                 // Unlock if there's a lock object
 921                 if ( lock_object ) mlt_service_unlock( lock_object );
 922         }
 923
 924         // Remove the last frame
 925         mlt_frame_close( frame );
 926
 927         return NULL;
 928 }
 929
 930 /** Start the read/render thread.
 931  *
 932  * \private \memberof mlt_consumer_s
 933  * \param this a consumer
 934  */
 935
 936 static void consumer_read_ahead_start( mlt_consumer this )
 937 {
 938         // We're running now
 939         this->ahead = 1;
 940
 941         // Create the frame queue
 942         this->frame_queue = mlt_deque_init( );
 943
 944         // Create the frame_queue mutex
 945         pthread_mutex_init( &this->frame_queue_mutex, NULL );
 946
 947         // Create the condition
 948         pthread_cond_init( &this->frame_queue_cond, NULL );
 949
 950         // Create the read ahead
 951         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( this ), "priority" ) )
 952         {
 953                 struct sched_param priority;
 954                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( this ), "priority" );
 955                 pthread_attr_t thread_attributes;
 956                 pthread_attr_init( &thread_attributes );
 957                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
 958                 pthread_attr_setschedparam( &thread_attributes, &priority );
 959                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
 960                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
 961                 if ( pthread_create( &this->ahead_thread, &thread_attributes, consumer_read_ahead_thread, this ) < 0 )
 962                         pthread_create( &this->ahead_thread, NULL, consumer_read_ahead_thread, this );
 963                 pthread_attr_destroy( &thread_attributes );
 964         }
 965         else
 966         {
 967                 pthread_create( &this->ahead_thread, NULL, consumer_read_ahead_thread, this );
 968         }
 969 }
 970
 971 /** Start the worker threads.
 972  *
 973  * \private \memberof mlt_consumer_s
 974  * \param this a consumer
 975  */
 976
 977 static void consumer_work_start( mlt_consumer this )
 978 {
 979         int n = abs( this->real_time );
 980         pthread_t thread;
 981
 982         // We're running now
 983         this->ahead = 1;
 984
 985         // Create the queues
 986         this->frame_queue = mlt_deque_init();
 987         this->done_queue = mlt_deque_init();
 988         this->worker_threads = mlt_deque_init();
 989
 990         // Create the mutexes
 991         pthread_mutex_init( &this->frame_queue_mutex, NULL );
 992         pthread_mutex_init( &this->done_queue_mutex, NULL );
 993
 994         // Create the conditions
 995         pthread_cond_init( &this->frame_queue_cond, NULL );
 996         pthread_cond_init( &this->done_queue_cond, NULL );
 997
 998         // Create the read ahead
 999         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( this ), "priority" ) )
1000         {
1001
1002                 struct sched_param priority;
1003                 pthread_attr_t thread_attributes;
1004
1005                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( this ), "priority" );
1006                 pthread_attr_init( &thread_attributes );
1007                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
1008                 pthread_attr_setschedparam( &thread_attributes, &priority );
1009                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
1010                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
1011
1012                 while ( n-- )
1013                 {
1014                         if ( pthread_create( &thread, &thread_attributes, consumer_read_ahead_thread, this ) < 0 )
1015                                 if ( pthread_create( &thread, NULL, consumer_read_ahead_thread, this ) == 0 )
1016                                         mlt_deque_push_back( this->worker_threads, (void*) thread );
1017                 }
1018                 pthread_attr_destroy( &thread_attributes );
1019         }
1020
1021         else
1022         {
1023                 while ( n-- )
1024                 {
1025                         if ( pthread_create( &thread, NULL, consumer_worker_thread, this ) == 0 )
1026                                 mlt_deque_push_back( this->worker_threads, (void*) thread );
1027                 }
1028         }
1029 }
1030
1031 /** Stop the read/render thread.
1032  *
1033  * \private \memberof mlt_consumer_s
1034  * \param this a consumer
1035  */
1036
1037 static void consumer_read_ahead_stop( mlt_consumer this )
1038 {
1039         // Make sure we're running
1040         if ( this->ahead )
1041         {
1042                 // Inform thread to stop
1043                 this->ahead = 0;
1044
1045                 // Broadcast to the condition in case it's waiting
1046                 pthread_mutex_lock( &this->frame_queue_mutex );
1047                 pthread_cond_broadcast( &this->frame_queue_cond );
1048                 pthread_mutex_unlock( &this->frame_queue_mutex );
1049
1050                 // Broadcast to the put condition in case it's waiting
1051                 pthread_mutex_lock( &this->put_mutex );
1052                 pthread_cond_broadcast( &this->put_cond );
1053                 pthread_mutex_unlock( &this->put_mutex );
1054
1055                 // Join the thread
1056                 pthread_join( this->ahead_thread, NULL );
1057
1058                 // Destroy the frame queue mutex
1059                 pthread_mutex_destroy( &this->frame_queue_mutex );
1060
1061                 // Destroy the condition
1062                 pthread_cond_destroy( &this->frame_queue_cond );
1063
1064                 // Wipe the queue
1065                 while ( mlt_deque_count( this->frame_queue ) )
1066                         mlt_frame_close( mlt_deque_pop_back( this->frame_queue ) );
1067
1068                 // Close the queue
1069                 mlt_deque_close( this->frame_queue );
1070         }
1071 }
1072
1073 /** Stop the worker threads.
1074  *
1075  * \private \memberof mlt_consumer_s
1076  * \param this a consumer
1077  */
1078
1079 static void consumer_work_stop( mlt_consumer this )
1080 {
1081         // Make sure we're running
1082         if ( this->ahead )
1083         {
1084                 // Inform thread to stop
1085                 this->ahead = 0;
1086
1087                 // Broadcast to the frame_queue condition in case it's waiting
1088                 pthread_mutex_lock( &this->frame_queue_mutex );
1089                 pthread_cond_broadcast( &this->frame_queue_cond );
1090                 pthread_mutex_unlock( &this->frame_queue_mutex );
1091
1092                 // Broadcast to the done_queue condition in case it's waiting
1093                 pthread_mutex_lock( &this->done_queue_mutex );
1094                 pthread_cond_broadcast( &this->done_queue_cond );
1095                 pthread_mutex_unlock( &this->done_queue_mutex );
1096
1097                 // Broadcast to the put condition in case it's waiting
1098                 pthread_mutex_lock( &this->put_mutex );
1099                 pthread_cond_broadcast( &this->put_cond );
1100                 pthread_mutex_unlock( &this->put_mutex );
1101
1102                 // Join the threads
1103                 pthread_t thread;
1104                 while ( ( thread = (pthread_t) mlt_deque_pop_front( this->worker_threads ) ) )
1105                         pthread_join( thread, NULL );
1106
1107                 // Destroy the mutexes
1108                 pthread_mutex_destroy( &this->frame_queue_mutex );
1109                 pthread_mutex_destroy( &this->done_queue_mutex );
1110
1111                 // Destroy the conditions
1112                 pthread_cond_destroy( &this->frame_queue_cond );
1113                 pthread_cond_destroy( &this->done_queue_cond );
1114
1115                 // Wipe the queues
1116                 while ( mlt_deque_count( this->frame_queue ) )
1117                         mlt_frame_close( mlt_deque_pop_back( this->frame_queue ) );
1118                 while ( mlt_deque_count( this->done_queue ) )
1119                         mlt_frame_close( mlt_deque_pop_back( this->done_queue ) );
1120
1121                 // Close the queues
1122                 mlt_deque_close( this->frame_queue );
1123                 mlt_deque_close( this->done_queue );
1124                 mlt_deque_close( this->worker_threads );
1125         }
1126 }
1127
1128 /** Flush the read/render thread's buffer.
1129  *
1130  * \public \memberof mlt_consumer_s
1131  * \param this a consumer
1132  */
1133
1134 void mlt_consumer_purge( mlt_consumer this )
1135 {
1136         if ( this->ahead )
1137         {
1138                 pthread_mutex_lock( &this->frame_queue_mutex );
1139                 while ( mlt_deque_count( this->frame_queue ) )
1140                         mlt_frame_close( mlt_deque_pop_back( this->frame_queue ) );
1141                 pthread_cond_broadcast( &this->frame_queue_cond );
1142                 pthread_mutex_unlock( &this->frame_queue_mutex );
1143
1144                 if ( this->done_queue )
1145                 {
1146                         pthread_mutex_lock( &this->done_queue_mutex );
1147                         while ( mlt_deque_count( this->done_queue ) )
1148                                 mlt_frame_close( mlt_deque_pop_back( this->done_queue ) );
1149                         pthread_cond_broadcast( &this->done_queue_cond );
1150                         pthread_mutex_unlock( &this->done_queue_mutex );
1151                 }
1152         }
1153 }
1154
1155 /** Get the next frame from the producer connected to a consumer.
1156  *
1157  * Typically, one uses this instead of \p mlt_consumer_get_frame to make
1158  * the asynchronous/real-time behavior configurable at runtime.
1159  * You should close the frame returned from this when you are done with it.
1160  *
1161  * \public \memberof mlt_consumer_s
1162  * \param this a consumer
1163  * \return a frame
1164  */
1165
1166 mlt_frame mlt_consumer_rt_frame( mlt_consumer this )
1167 {
1168         // Frame to return
1169         mlt_frame frame = NULL;
1170
1171         // Get the properties
1172         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
1173
1174         // Check if the user has requested real time or not
1175         if ( this->real_time == 1 || this->real_time == -1 )
1176         {
1177                 int size = 1;
1178
1179                 // Is the read ahead running?
1180                 if ( this->ahead == 0 )
1181                 {
1182                         int buffer = mlt_properties_get_int( properties, "buffer" );
1183                         int prefill = mlt_properties_get_int( properties, "prefill" );
1184                         consumer_read_ahead_start( this );
1185                         if ( buffer > 1 )
1186                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
1187                 }
1188
1189                 // Get frame from queue
1190                 pthread_mutex_lock( &this->frame_queue_mutex );
1191                 while( this->ahead && mlt_deque_count( this->frame_queue ) < size )
1192                         pthread_cond_wait( &this->frame_queue_cond, &this->frame_queue_mutex );
1193                 frame = mlt_deque_pop_front( this->frame_queue );
1194                 pthread_cond_broadcast( &this->frame_queue_cond );
1195                 pthread_mutex_unlock( &this->frame_queue_mutex );
1196         }
1197         else if ( this->real_time > 1 || this->real_time < -1 )
1198         {
1199                 // Use multiple worker threads and a work queue
1200                 int size = abs( this->real_time );
1201
1202                 // Start worker threads if not already
1203                 if ( ! this->ahead )
1204                 {
1205                         int buffer = mlt_properties_get_int( properties, "buffer" );
1206                         int prefill = mlt_properties_get_int( properties, "prefill" );
1207                         consumer_work_start( this );
1208                         if ( buffer > 1 )
1209                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
1210                 }
1211
1212                 // Get frame from the done queue
1213                 mlt_log_debug( MLT_CONSUMER_SERVICE(this), "size %d done count %d\n", size, mlt_deque_count( this->done_queue ) );
1214                 if ( this->real_time > 0 && size == this->real_time && mlt_deque_count( this->done_queue ) <= size )
1215                 {
1216                         frame = mlt_consumer_get_frame( this );
1217                 }
1218                 else
1219                 {
1220                         pthread_mutex_lock( &this->done_queue_mutex );
1221                         while( this->ahead && mlt_deque_count( this->done_queue ) <= size )
1222                                 pthread_cond_wait( &this->done_queue_cond, &this->done_queue_mutex );
1223                         frame = mlt_deque_pop_front( this->done_queue );
1224                         pthread_mutex_unlock( &this->done_queue_mutex );
1225                         pthread_cond_signal( &this->done_queue_cond );
1226                 }
1227         }
1228         else
1229         {
1230                 // Get the frame in non real time
1231                 frame = mlt_consumer_get_frame( this );
1232
1233                 // This isn't true, but from the consumers perspective it is
1234                 if ( frame != NULL )
1235                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
1236         }
1237
1238         return frame;
1239 }
1240
1241 /** Callback for the implementation to indicate a stopped condition.
1242  *
1243  * \public \memberof mlt_consumer_s
1244  * \param this a consumer
1245  */
1246
1247 void mlt_consumer_stopped( mlt_consumer this )
1248 {
1249         mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( this ), "running", 0 );
1250         mlt_events_fire( MLT_CONSUMER_PROPERTIES( this ), "consumer-stopped", NULL );
1251         mlt_event_unblock( this->event_listener );
1252 }
1253
1254 /** Stop the consumer.
1255  *
1256  * \public \memberof mlt_consumer_s
1257  * \param this a consumer
1258  * \return true if there was an error
1259  */
1260
1261 int mlt_consumer_stop( mlt_consumer this )
1262 {
1263         // Get the properies
1264         mlt_properties properties = MLT_CONSUMER_PROPERTIES( this );
1265
1266         // Just in case...
1267         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping put waiting\n" );
1268         pthread_mutex_lock( &this->put_mutex );
1269         this->put_active = 0;
1270         pthread_cond_broadcast( &this->put_cond );
1271         pthread_mutex_unlock( &this->put_mutex );
1272
1273         // Stop the consumer
1274         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping consumer\n" );
1275         if ( this->stop != NULL )
1276                 this->stop( this );
1277
1278         // Check if the user has requested real time or not and stop if necessary
1279         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopping read_ahead\n" );
1280         if ( abs( this->real_time ) == 1 )
1281                 consumer_read_ahead_stop( this );
1282         else if ( abs( this->real_time ) > 1 )
1283                 consumer_work_stop( this );
1284
1285         // Kill the test card
1286         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
1287
1288         // Check and run a post command
1289         if ( mlt_properties_get( properties, "post" ) )
1290                 if (system( mlt_properties_get( properties, "post" ) ) == -1 )
1291                         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "post" ) );
1292
1293         mlt_log( MLT_CONSUMER_SERVICE( this ), MLT_LOG_DEBUG, "stopped\n" );
1294
1295         return 0;
1296 }
1297
1298 /** Determine if the consumer is stopped.
1299  *
1300  * \public \memberof mlt_consumer_s
1301  * \param this a consumer
1302  * \return true if the consumer is stopped
1303  */
1304
1305 int mlt_consumer_is_stopped( mlt_consumer this )
1306 {
1307         // Check if the consumer is stopped
1308         if ( this->is_stopped != NULL )
1309                 return this->is_stopped( this );
1310
1311         return 0;
1312 }
1313
1314 /** Close and destroy the consumer.
1315  *
1316  * \public \memberof mlt_consumer_s
1317  * \param this a consumer
1318  */
1319
1320 void mlt_consumer_close( mlt_consumer this )
1321 {
1322         if ( this != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( this ) ) <= 0 )
1323         {
1324                 // Get the childs close function
1325                 void ( *consumer_close )( ) = this->close;
1326
1327                 if ( consumer_close )
1328                 {
1329                         // Just in case...
1330                         //mlt_consumer_stop( this );
1331
1332                         this->close = NULL;
1333                         consumer_close( this );
1334                 }
1335                 else
1336                 {
1337                         // Make sure it only gets called once
1338                         this->parent.close = NULL;
1339
1340                         // Destroy the push mutex and condition
1341                         pthread_mutex_destroy( &this->put_mutex );
1342                         pthread_cond_destroy( &this->put_cond );
1343
1344                         mlt_service_close( &this->parent );
1345                 }
1346         }
1347 }
1348
1349 /** Get the position of the last frame shown.
1350  *
1351  * \public \memberof mlt_consumer_s
1352  * \param consumer a consumer
1353  * \return the position
1354  */
1355
1356 mlt_position mlt_consumer_position( mlt_consumer consumer )
1357 {
1358         return consumer->position;
1359 }
1360