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) 2003-2010 Ushodaya Enterprises Limited
   7  * \author Charles Yates <charles.yates@pandora.be>
   8  * \author Dan Dennedy <dan@dennedy.org>
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "mlt_consumer.h"
  26 #include "mlt_factory.h"
  27 #include "mlt_producer.h"
  28 #include "mlt_frame.h"
  29 #include "mlt_profile.h"
  30 #include "mlt_log.h"
  31
  32 #include <stdio.h>
  33 #include <string.h>
  34 #include <stdlib.h>
  35 #include <sys/time.h>
  36
  37 /** Define this if you want an automatic deinterlace (if necessary) when the
  38  * consumer's producer is not running at normal speed.
  39  */
  40 #undef DEINTERLACE_ON_NOT_NORMAL_SPEED
  41
  42 /** This is not the ideal place for this, but it is needed by VDPAU as well.
  43  */
  44 pthread_mutex_t mlt_sdl_mutex = PTHREAD_MUTEX_INITIALIZER;
  45
  46 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service self, void **args );
  47 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service self, void **args );
  48 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer self, char *name );
  49 static void apply_profile_properties( mlt_consumer self, mlt_profile profile, mlt_properties properties );
  50 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer self, mlt_frame frame );
  51
  52 /** Initialize a consumer service.
  53  *
  54  * \public \memberof mlt_consumer_s
  55  * \param self the consumer to initialize
  56  * \param child a pointer to the object for the subclass
  57  * \param profile the \p mlt_profile_s to use (optional but recommended,
  58  * uses the environment variable MLT if self is NULL)
  59  * \return true if there was an error
  60  */
  61
  62 int mlt_consumer_init( mlt_consumer self, void *child, mlt_profile profile )
  63 {
  64         int error = 0;
  65         memset( self, 0, sizeof( struct mlt_consumer_s ) );
  66         self->child = child;
  67         error = mlt_service_init( &self->parent, self );
  68         if ( error == 0 )
  69         {
  70                 // Get the properties from the service
  71                 mlt_properties properties = MLT_SERVICE_PROPERTIES( &self->parent );
  72
  73                 // Apply profile to properties
  74                 if ( profile == NULL )
  75                 {
  76                         // Normally the application creates the profile and controls its lifetime
  77                         // This is the fallback exception handling
  78                         profile = mlt_profile_init( NULL );
  79                         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
  80                         mlt_properties_set_data( properties, "_profile", profile, 0, (mlt_destructor)mlt_profile_close, NULL );
  81                 }
  82                 apply_profile_properties( self, profile, properties );
  83
  84                 // Default rescaler for all consumers
  85                 mlt_properties_set( properties, "rescale", "bilinear" );
  86
  87                 // Default read ahead buffer size
  88                 mlt_properties_set_int( properties, "buffer", 25 );
  89                 mlt_properties_set_int( properties, "drop_max", 5 );
  90
  91                 // Default audio frequency and channels
  92                 mlt_properties_set_int( properties, "frequency", 48000 );
  93                 mlt_properties_set_int( properties, "channels", 2 );
  94
  95                 // Default of all consumers is real time
  96                 mlt_properties_set_int( properties, "real_time", 1 );
  97
  98                 // Default to environment test card
  99                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
 100
 101                 // Hmm - default all consumers to yuv422 :-/
 102                 self->format = mlt_image_yuv422;
 103                 mlt_properties_set( properties, "mlt_image_format", mlt_image_format_name( self->format ) );
 104                 mlt_properties_set( properties, "mlt_audio_format", mlt_audio_format_name( mlt_audio_s16 ) );
 105
 106                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
 107                 mlt_events_register( properties, "consumer-frame-render", ( mlt_transmitter )mlt_consumer_frame_render );
 108                 mlt_events_register( properties, "consumer-stopped", NULL );
 109                 mlt_events_listen( properties, self, "consumer-frame-show", ( mlt_listener )on_consumer_frame_show );
 110
 111                 // Register a property-changed listener to handle the profile property -
 112                 // subsequent properties can override the profile
 113                 self->event_listener = mlt_events_listen( properties, self, "property-changed", ( mlt_listener )mlt_consumer_property_changed );
 114
 115                 // Create the push mutex and condition
 116                 pthread_mutex_init( &self->put_mutex, NULL );
 117                 pthread_cond_init( &self->put_cond, NULL );
 118
 119         }
 120         return error;
 121 }
 122
 123 /** Convert the profile into properties on the consumer.
 124  *
 125  * \private \memberof mlt_consumer_s
 126  * \param self a consumer
 127  * \param profile a profile
 128  * \param properties a properties list (typically, the consumer's)
 129  */
 130
 131 static void apply_profile_properties( mlt_consumer self, mlt_profile profile, mlt_properties properties )
 132 {
 133         mlt_event_block( self->event_listener );
 134         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 135         mlt_properties_set_int( properties, "frame_rate_num", profile->frame_rate_num );
 136         mlt_properties_set_int( properties, "frame_rate_den", profile->frame_rate_den );
 137         mlt_properties_set_int( properties, "width", profile->width );
 138         mlt_properties_set_int( properties, "height", profile->height );
 139         mlt_properties_set_int( properties, "progressive", profile->progressive );
 140         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 141         mlt_properties_set_int( properties, "sample_aspect_num", profile->sample_aspect_num );
 142         mlt_properties_set_int( properties, "sample_aspect_den", profile->sample_aspect_den );
 143         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 144         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 145         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 146         mlt_properties_set_int( properties, "colorspace", profile->colorspace );
 147         mlt_event_unblock( self->event_listener );
 148 }
 149
 150 /** The property-changed event listener
 151  *
 152  * \private \memberof mlt_consumer_s
 153  * \param owner the events object
 154  * \param self the consumer
 155  * \param name the name of the property that changed
 156  */
 157
 158 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer self, char *name )
 159 {
 160         if ( !strcmp( name, "mlt_profile" ) )
 161         {
 162                 // Get the properies
 163                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 164
 165                 // Get the current profile
 166                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 167
 168                 // Load the new profile
 169                 mlt_profile new_profile = mlt_profile_init( mlt_properties_get( properties, name ) );
 170
 171                 if ( new_profile )
 172                 {
 173                         // Copy the profile
 174                         if ( profile != NULL )
 175                         {
 176                                 free( profile->description );
 177                                 memcpy( profile, new_profile, sizeof( struct mlt_profile_s ) );
 178                                 profile->description = strdup( new_profile->description );
 179                                 mlt_profile_close( new_profile );
 180                         }
 181                         else
 182                         {
 183                                 profile = new_profile;
 184                         }
 185
 186                         // Apply to properties
 187                         apply_profile_properties( self, profile, properties );
 188                 }
 189         }
 190         else if ( !strcmp( name, "frame_rate_num" ) )
 191         {
 192                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 193                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 194                 if ( profile )
 195                 {
 196                         profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 197                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 198                 }
 199         }
 200         else if ( !strcmp( name, "frame_rate_den" ) )
 201         {
 202                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 203                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 204                 if ( profile )
 205                 {
 206                         profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 207                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 208                 }
 209         }
 210         else if ( !strcmp( name, "width" ) )
 211         {
 212                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 213                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 214                 if ( profile )
 215                         profile->width = mlt_properties_get_int( properties, "width" );
 216         }
 217         else if ( !strcmp( name, "height" ) )
 218         {
 219                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 220                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 221                 if ( profile )
 222                         profile->height = mlt_properties_get_int( properties, "height" );
 223         }
 224         else if ( !strcmp( name, "progressive" ) )
 225         {
 226                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 227                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 228                 if ( profile )
 229                         profile->progressive = mlt_properties_get_int( properties, "progressive" );
 230         }
 231         else if ( !strcmp( name, "sample_aspect_num" ) )
 232         {
 233                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 234                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 235                 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 236                 if ( profile )
 237                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 238         }
 239         else if ( !strcmp( name, "sample_aspect_den" ) )
 240         {
 241                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 242                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 243                 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 244                 if ( profile )
 245                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 246         }
 247         else if ( !strcmp( name, "display_aspect_num" ) )
 248         {
 249                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 250                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 251                 if ( profile )
 252                 {
 253                         profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 254                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 255                 }
 256         }
 257         else if ( !strcmp( name, "display_aspect_den" ) )
 258         {
 259                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 260                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 261                 if ( profile )
 262                 {
 263                         profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 264                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 265                 }
 266         }
 267         else if ( !strcmp( name, "colorspace" ) )
 268         {
 269                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 270                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 271                 if ( profile )
 272                         profile->colorspace = mlt_properties_get_int( properties, "colorspace" );
 273         }
 274 }
 275
 276 /** The transmitter for the consumer-frame-show event
 277  *
 278  * Invokes the listener.
 279  *
 280  * \private \memberof mlt_consumer_s
 281  * \param listener a function pointer that will be invoked
 282  * \param owner the events object that will be passed to \p listener
 283  * \param self  a service that will be passed to \p listener
 284  * \param args an array of pointers - the first entry is passed as a string to \p listener
 285  */
 286
 287 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
 288 {
 289         if ( listener != NULL )
 290                 listener( owner, self, ( mlt_frame )args[ 0 ] );
 291 }
 292
 293 /** The transmitter for the consumer-frame-render event
 294  *
 295  * Invokes the listener.
 296  *
 297  * \private \memberof mlt_consumer_s
 298  * \param listener a function pointer that will be invoked
 299  * \param owner the events object that will be passed to \p listener
 300  * \param self  a service that will be passed to \p listener
 301  * \param args an array of pointers - the first entry is passed as a string to \p listener
 302  */
 303
 304 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
 305 {
 306         if ( listener != NULL )
 307                 listener( owner, self, ( mlt_frame )args[ 0 ] );
 308 }
 309
 310 /** A listener on the consumer-frame-show event
 311  *
 312  * Saves the position of the frame shown.
 313  *
 314  * \private \memberof mlt_consumer_s
 315  * \param owner the events object
 316  * \param consumer the consumer on which this event occurred
 317  * \param frame the frame that was shown
 318  */
 319
 320 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer consumer, mlt_frame frame )
 321 {
 322         if ( frame )
 323                 consumer->position = mlt_frame_get_position( frame );
 324 }
 325
 326 /** Create a new consumer.
 327  *
 328  * \public \memberof mlt_consumer_s
 329  * \param profile a profile (optional, but recommended)
 330  * \return a new consumer
 331  */
 332
 333 mlt_consumer mlt_consumer_new( mlt_profile profile )
 334 {
 335         // Create the memory for the structure
 336         mlt_consumer self = malloc( sizeof( struct mlt_consumer_s ) );
 337
 338         // Initialise it
 339         if ( self != NULL )
 340                 mlt_consumer_init( self, NULL, profile );
 341
 342         // Return it
 343         return self;
 344 }
 345
 346 /** Get the parent service object.
 347  *
 348  * \public \memberof mlt_consumer_s
 349  * \param self a consumer
 350  * \return the parent service class
 351  * \see MLT_CONSUMER_SERVICE
 352  */
 353
 354 mlt_service mlt_consumer_service( mlt_consumer self )
 355 {
 356         return self != NULL ? &self->parent : NULL;
 357 }
 358
 359 /** Get the consumer properties.
 360  *
 361  * \public \memberof mlt_consumer_s
 362  * \param self a consumer
 363  * \return the consumer's properties list
 364  * \see MLT_CONSUMER_PROPERTIES
 365  */
 366
 367 mlt_properties mlt_consumer_properties( mlt_consumer self )
 368 {
 369         return self != NULL ? MLT_SERVICE_PROPERTIES( &self->parent ) : NULL;
 370 }
 371
 372 /** Connect the consumer to the producer.
 373  *
 374  * \public \memberof mlt_consumer_s
 375  * \param self a consumer
 376  * \param producer a producer
 377  * \return > 0 warning, == 0 success, < 0 serious error,
 378  *         1 = this service does not accept input,
 379  *         2 = the producer is invalid,
 380  *         3 = the producer is already registered with this consumer
 381  */
 382
 383 int mlt_consumer_connect( mlt_consumer self, mlt_service producer )
 384 {
 385         return mlt_service_connect_producer( &self->parent, producer, 0 );
 386 }
 387
 388 /** Start the consumer.
 389  *
 390  * \public \memberof mlt_consumer_s
 391  * \param self a consumer
 392  * \return true if there was an error
 393  */
 394
 395 int mlt_consumer_start( mlt_consumer self )
 396 {
 397         if ( !mlt_consumer_is_stopped( self ) )
 398                 return 0;
 399
 400         // Stop listening to the property-changed event
 401         mlt_event_block( self->event_listener );
 402
 403         // Get the properies
 404         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 405
 406         // Determine if there's a test card producer
 407         char *test_card = mlt_properties_get( properties, "test_card" );
 408
 409         // Just to make sure nothing is hanging around...
 410         self->put = NULL;
 411         self->put_active = 1;
 412
 413         // Deal with it now.
 414         if ( test_card != NULL )
 415         {
 416                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
 417                 {
 418                         // Create a test card producer
 419                         mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 420                         mlt_producer producer = mlt_factory_producer( profile, NULL, test_card );
 421
 422                         // Do we have a producer
 423                         if ( producer != NULL )
 424                         {
 425                                 // Test card should loop I guess...
 426                                 mlt_properties_set( MLT_PRODUCER_PROPERTIES( producer ), "eof", "loop" );
 427                                 //mlt_producer_set_speed( producer, 0 );
 428                                 //mlt_producer_set_in_and_out( producer, 0, 0 );
 429
 430                                 // Set the test card on the consumer
 431                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
 432                         }
 433                 }
 434         }
 435         else
 436         {
 437                 // Allow the hash table to speed things up
 438                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
 439         }
 440
 441         // Set the frame duration in microseconds for the frame-dropping heuristic
 442         int frame_duration = 1000000 / mlt_properties_get_int( properties, "frame_rate_num" ) *
 443                         mlt_properties_get_int( properties, "frame_rate_den" );
 444         mlt_properties_set_int( properties, "frame_duration", frame_duration );
 445
 446         // Check and run an ante command
 447         if ( mlt_properties_get( properties, "ante" ) )
 448                 if ( system( mlt_properties_get( properties, "ante" ) ) == -1 )
 449                         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "ante" ) );
 450
 451         // Set the real_time preference
 452         self->real_time = mlt_properties_get_int( properties, "real_time" );
 453
 454         // For worker threads implementation, buffer must be at least # threads
 455         if ( abs( self->real_time ) > 1 && mlt_properties_get_int( properties, "buffer" ) <= abs( self->real_time ) )
 456                 mlt_properties_set_int( properties, "_buffer", abs( self->real_time ) + 1 );
 457
 458         // Get the image format to use for rendering threads
 459         const char* format = mlt_properties_get( properties, "mlt_image_format" );
 460         if ( format )
 461         {
 462                 if ( !strcmp( format, "rgb24" ) )
 463                         self->format = mlt_image_rgb24;
 464                 else if ( !strcmp( format, "rgb24a" ) )
 465                         self->format = mlt_image_rgb24a;
 466                 else if ( !strcmp( format, "yuv420p" ) )
 467                         self->format = mlt_image_yuv420p;
 468                 else if ( !strcmp( format, "none" ) )
 469                         self->format = mlt_image_none;
 470                 else
 471                         self->format = mlt_image_yuv422;
 472         }
 473
 474         // Start the service
 475         if ( self->start != NULL )
 476                 return self->start( self );
 477
 478         return 0;
 479 }
 480
 481 /** An alternative method to feed frames into the consumer.
 482  *
 483  * Only valid if the consumer itself is not connected.
 484  *
 485  * \public \memberof mlt_consumer_s
 486  * \param self a consumer
 487  * \param frame a frame
 488  * \return true (ignore self for now)
 489  */
 490
 491 int mlt_consumer_put_frame( mlt_consumer self, mlt_frame frame )
 492 {
 493         int error = 1;
 494
 495         // Get the service assoicated to the consumer
 496         mlt_service service = MLT_CONSUMER_SERVICE( self );
 497
 498         if ( mlt_service_producer( service ) == NULL )
 499         {
 500                 struct timeval now;
 501                 struct timespec tm;
 502                 pthread_mutex_lock( &self->put_mutex );
 503                 while ( self->put_active && self->put != NULL )
 504                 {
 505                         gettimeofday( &now, NULL );
 506                         tm.tv_sec = now.tv_sec + 1;
 507                         tm.tv_nsec = now.tv_usec * 1000;
 508                         pthread_cond_timedwait( &self->put_cond, &self->put_mutex, &tm );
 509                 }
 510                 if ( self->put_active && self->put == NULL )
 511                         self->put = frame;
 512                 else
 513                         mlt_frame_close( frame );
 514                 pthread_cond_broadcast( &self->put_cond );
 515                 pthread_mutex_unlock( &self->put_mutex );
 516         }
 517         else
 518         {
 519                 mlt_frame_close( frame );
 520         }
 521
 522         return error;
 523 }
 524
 525 /** Protected method for consumer to get frames from connected service
 526  *
 527  * \public \memberof mlt_consumer_s
 528  * \param self a consumer
 529  * \return a frame
 530  */
 531
 532 mlt_frame mlt_consumer_get_frame( mlt_consumer self )
 533 {
 534         // Frame to return
 535         mlt_frame frame = NULL;
 536
 537         // Get the service assoicated to the consumer
 538         mlt_service service = MLT_CONSUMER_SERVICE( self );
 539
 540         // Get the consumer properties
 541         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 542
 543         // Get the frame
 544         if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) )
 545         {
 546                 struct timeval now;
 547                 struct timespec tm;
 548                 pthread_mutex_lock( &self->put_mutex );
 549                 while ( self->put_active && self->put == NULL )
 550                 {
 551                         gettimeofday( &now, NULL );
 552                         tm.tv_sec = now.tv_sec + 1;
 553                         tm.tv_nsec = now.tv_usec * 1000;
 554                         pthread_cond_timedwait( &self->put_cond, &self->put_mutex, &tm );
 555                 }
 556                 frame = self->put;
 557                 self->put = NULL;
 558                 pthread_cond_broadcast( &self->put_cond );
 559                 pthread_mutex_unlock( &self->put_mutex );
 560                 if ( frame != NULL )
 561                         mlt_service_apply_filters( service, frame, 0 );
 562         }
 563         else if ( mlt_service_producer( service ) != NULL )
 564         {
 565                 mlt_service_get_frame( service, &frame, 0 );
 566         }
 567         else
 568         {
 569                 frame = mlt_frame_init( service );
 570         }
 571
 572         if ( frame != NULL )
 573         {
 574                 // Get the frame properties
 575                 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
 576
 577                 // Get the test card producer
 578                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
 579
 580                 // Attach the test frame producer to it.
 581                 if ( test_card != NULL )
 582                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
 583
 584                 // Attach the rescale property
 585                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
 586
 587                 // Aspect ratio and other jiggery pokery
 588                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
 589                 mlt_properties_set_int( frame_properties, "consumer_deinterlace", mlt_properties_get_int( properties, "progressive" ) | mlt_properties_get_int( properties, "deinterlace" ) );
 590                 mlt_properties_set( frame_properties, "deinterlace_method", mlt_properties_get( properties, "deinterlace_method" ) );
 591                 mlt_properties_set_int( frame_properties, "consumer_tff", mlt_properties_get_int( properties, "top_field_first" ) );
 592         }
 593
 594         // Return the frame
 595         return frame;
 596 }
 597
 598 /** Compute the time difference between now and a time value.
 599  *
 600  * \private \memberof mlt_consumer_s
 601  * \param time1 a time value to be compared against now
 602  * \return the difference in microseconds
 603  */
 604
 605 static inline long time_difference( struct timeval *time1 )
 606 {
 607         struct timeval time2;
 608         time2.tv_sec = time1->tv_sec;
 609         time2.tv_usec = time1->tv_usec;
 610         gettimeofday( time1, NULL );
 611         return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec;
 612 }
 613
 614 /** The thread procedure for asynchronously pulling frames through the service
 615  * network connected to a consumer.
 616  *
 617  * \private \memberof mlt_consumer_s
 618  * \param arg a consumer
 619  */
 620
 621 static void *consumer_read_ahead_thread( void *arg )
 622 {
 623         // The argument is the consumer
 624         mlt_consumer self = arg;
 625
 626         // Get the properties of the consumer
 627         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 628
 629         // Get the width and height
 630         int width = mlt_properties_get_int( properties, "width" );
 631         int height = mlt_properties_get_int( properties, "height" );
 632
 633         // See if video is turned off
 634         int video_off = mlt_properties_get_int( properties, "video_off" );
 635         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 636         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 637
 638         // Get the audio settings
 639         mlt_audio_format afmt = mlt_audio_s16;
 640         const char *format = mlt_properties_get( properties, "mlt_audio_format" );
 641         if ( format )
 642         {
 643                 if ( !strcmp( format, "none" ) )
 644                         afmt = mlt_audio_none;
 645                 else if ( !strcmp( format, "s32" ) )
 646                         afmt = mlt_audio_s32;
 647                 else if ( !strcmp( format, "s32le" ) )
 648                         afmt = mlt_audio_s32le;
 649                 else if ( !strcmp( format, "float" ) )
 650                         afmt = mlt_audio_float;
 651                 else if ( !strcmp( format, "f32le" ) )
 652                         afmt = mlt_audio_f32le;
 653         }
 654         int counter = 0;
 655         double fps = mlt_properties_get_double( properties, "fps" );
 656         int channels = mlt_properties_get_int( properties, "channels" );
 657         int frequency = mlt_properties_get_int( properties, "frequency" );
 658         int samples = 0;
 659         void *audio = NULL;
 660
 661         // See if audio is turned off
 662         int audio_off = mlt_properties_get_int( properties, "audio_off" );
 663
 664         // Get the maximum size of the buffer
 665         int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
 666
 667         // General frame variable
 668         mlt_frame frame = NULL;
 669         uint8_t *image = NULL;
 670
 671         // Time structures
 672         struct timeval ante;
 673
 674         // Average time for get_frame and get_image
 675         int count = 0;
 676         int skipped = 0;
 677         int64_t time_process = 0;
 678         int skip_next = 0;
 679         mlt_position pos = 0;
 680         mlt_position start_pos = 0;
 681         mlt_position last_pos = 0;
 682         int frame_duration = mlt_properties_get_int( properties, "frame_duration" );
 683         int drop_max = mlt_properties_get_int( properties, "drop_max" );
 684
 685         if ( preview_off && preview_format != 0 )
 686                 self->format = preview_format;
 687
 688         // Get the first frame
 689         frame = mlt_consumer_get_frame( self );
 690
 691         if ( frame )
 692         {
 693                 // Get the image of the first frame
 694                 if ( !video_off )
 695                 {
 696                         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 697                         mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
 698                 }
 699
 700                 if ( !audio_off )
 701                 {
 702                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 703                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 704                 }
 705
 706                 // Mark as rendered
 707                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 708                 last_pos = start_pos = pos = mlt_frame_get_position( frame );
 709         }
 710
 711         // Get the starting time (can ignore the times above)
 712         gettimeofday( &ante, NULL );
 713
 714         // Continue to read ahead
 715         while ( self->ahead )
 716         {
 717                 // Put the current frame into the queue
 718                 pthread_mutex_lock( &self->queue_mutex );
 719                 while( self->ahead && mlt_deque_count( self->queue ) >= buffer )
 720                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
 721                 mlt_deque_push_back( self->queue, frame );
 722                 pthread_cond_broadcast( &self->queue_cond );
 723                 pthread_mutex_unlock( &self->queue_mutex );
 724
 725                 // Get the next frame
 726                 frame = mlt_consumer_get_frame( self );
 727
 728                 // If there's no frame, we're probably stopped...
 729                 if ( frame == NULL )
 730                         continue;
 731                 pos = mlt_frame_get_position( frame );
 732
 733                 // Increment the counter used for averaging processing cost
 734                 count ++;
 735
 736                 // All non-normal playback frames should be shown
 737                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 738                 {
 739 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 740                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 741 #endif
 742                         // Indicate seeking or trick-play
 743                         start_pos = pos;
 744                 }
 745
 746                 // If skip flag not set or frame-dropping disabled
 747                 if ( !skip_next || self->real_time == -1 )
 748                 {
 749                         if ( !video_off )
 750                         {
 751                                 // Reset width/height - could have been changed by previous mlt_frame_get_image
 752                                 width = mlt_properties_get_int( properties, "width" );
 753                                 height = mlt_properties_get_int( properties, "height" );
 754
 755                                 // Get the image
 756                                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 757                                 mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
 758                         }
 759
 760                         // Indicate the rendered image is available.
 761                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 762
 763                         // Reset consecutively-skipped counter
 764                         skipped = 0;
 765                 }
 766                 else // Skip image processing
 767                 {
 768                         // Increment the number of consecutively-skipped frames
 769                         skipped++;
 770
 771                         // If too many (1 sec) consecutively-skipped frames
 772                         if ( skipped > drop_max )
 773                         {
 774                                 // Reset cost tracker
 775                                 time_process = 0;
 776                                 count = 1;
 777                                 mlt_log_verbose( self, "too many frames dropped - forcing next frame\n" );
 778                         }
 779                 }
 780
 781                 // Always process audio
 782                 if ( !audio_off )
 783                 {
 784                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 785                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 786                 }
 787
 788                 // Get the time to process this frame
 789                 int64_t time_current = time_difference( &ante );
 790
 791                 // If the current time is not suddenly some large amount
 792                 if ( time_current < time_process / count * 20 || !time_process || count < 5 )
 793                 {
 794                         // Accumulate the cost for processing this frame
 795                         time_process += time_current;
 796                 }
 797                 else
 798                 {
 799                         mlt_log_debug( self, "current %"PRId64" threshold %"PRId64" count %d\n",
 800                                 time_current, (int64_t) (time_process / count * 20), count );
 801                         // Ignore the cost of this frame's time
 802                         count--;
 803                 }
 804
 805                 // Determine if we started, resumed, or seeked
 806                 if ( pos != last_pos + 1 )
 807                         start_pos = pos;
 808                 last_pos = pos;
 809
 810                 // Do not skip the first 20% of buffer at start, resume, or seek
 811                 if ( pos - start_pos <= buffer / 5 + 1 )
 812                 {
 813                         // Reset cost tracker
 814                         time_process = 0;
 815                         count = 1;
 816                 }
 817
 818                 // Reset skip flag
 819                 skip_next = 0;
 820
 821                 // Only consider skipping if the buffer level is low (or really small)
 822                 if ( mlt_deque_count( self->queue ) <= buffer / 5 + 1 )
 823                 {
 824                         // Skip next frame if average cost exceeds frame duration.
 825                         if ( time_process / count > frame_duration )
 826                                 skip_next = 1;
 827                         if ( skip_next )
 828                                 mlt_log_debug( self, "avg usec %"PRId64" (%"PRId64"/%d) duration %d\n",
 829                                         time_process/count, time_process, count, frame_duration);
 830                 }
 831         }
 832
 833         // Remove the last frame
 834         mlt_frame_close( frame );
 835
 836         return NULL;
 837 }
 838
 839 /** Locate the first unprocessed frame in the queue.
 840  *
 841  * When playing with realtime behavior, we do not use the true head, but
 842  * rather an adjusted process_head. The process_head is adjusted based on
 843  * the rate of frame-dropping or recovery from frame-dropping. The idea is
 844  * that as the level of frame-dropping increases to move the process_head
 845  * closer to the tail because the frames are not completing processing prior
 846  * to their playout! Then, as frames are not dropped the process_head moves
 847  * back closer to the head of the queue so that worker threads can work
 848  * ahead of the playout point (queue head).
 849  *
 850  * \private \memberof mlt_consumer_s
 851  * \param self a consumer
 852  * \return an index into the queue
 853  */
 854
 855 static inline int first_unprocessed_frame( mlt_consumer self )
 856 {
 857         int index = self->real_time <= 0 ? 0 : self->process_head;
 858         while ( index < mlt_deque_count( self->queue ) && MLT_FRAME( mlt_deque_peek( self->queue, index ) )->is_processing )
 859                 index++;
 860         return index;
 861 }
 862
 863 /** The worker thread procedure for parallel processing frames.
 864  *
 865  * \private \memberof mlt_consumer_s
 866  * \param arg a consumer
 867  */
 868
 869 static void *consumer_worker_thread( void *arg )
 870 {
 871         // The argument is the consumer
 872         mlt_consumer self = arg;
 873
 874         // Get the properties of the consumer
 875         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 876
 877         // Get the width and height
 878         int width = mlt_properties_get_int( properties, "width" );
 879         int height = mlt_properties_get_int( properties, "height" );
 880         mlt_image_format format = self->format;
 881
 882         // See if video is turned off
 883         int video_off = mlt_properties_get_int( properties, "video_off" );
 884         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 885         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 886
 887         // General frame variable
 888         mlt_frame frame = NULL;
 889         uint8_t *image = NULL;
 890
 891         if ( preview_off && preview_format != 0 )
 892                 format = preview_format;
 893
 894         // Continue to read ahead
 895         while ( self->ahead )
 896         {
 897                 // Get the next unprocessed frame from the work queue
 898                 pthread_mutex_lock( &self->queue_mutex );
 899                 int index = first_unprocessed_frame( self );
 900                 while ( self->ahead && index >= mlt_deque_count( self->queue ) )
 901                 {
 902                         mlt_log_debug( MLT_CONSUMER_SERVICE(self), "waiting in worker index = %d queue count = %d\n",
 903                                 index, mlt_deque_count( self->queue ) );
 904                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
 905                         index = first_unprocessed_frame( self );
 906                 }
 907
 908                 // Mark the frame for processing
 909                 frame = mlt_deque_peek( self->queue, index );
 910                 if ( frame )
 911                 {
 912                         mlt_log_debug( MLT_CONSUMER_SERVICE(self), "worker processing index = %d frame %d queue count = %d\n",
 913                                 index, mlt_frame_get_position(frame), mlt_deque_count( self->queue ) );
 914                         frame->is_processing = 1;
 915                         mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( frame ) );
 916                 }
 917                 pthread_mutex_unlock( &self->queue_mutex );
 918
 919                 // If there's no frame, we're probably stopped...
 920                 if ( frame == NULL )
 921                         continue;
 922
 923 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 924                 // All non normal playback frames should be shown
 925                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 926                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 927 #endif
 928
 929                 // Get the image
 930                 if ( !video_off )
 931                 {
 932                         // Fetch width/height again
 933                         width = mlt_properties_get_int( properties, "width" );
 934                         height = mlt_properties_get_int( properties, "height" );
 935                         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 936                         mlt_frame_get_image( frame, &image, &format, &width, &height, 0 );
 937                 }
 938                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 939                 mlt_frame_close( frame );
 940
 941                 // Tell a waiting thread (non-realtime main consumer thread) that we are done.
 942                 pthread_mutex_lock( &self->done_mutex );
 943                 pthread_cond_broadcast( &self->done_cond );
 944                 pthread_mutex_unlock( &self->done_mutex );
 945         }
 946
 947         return NULL;
 948 }
 949
 950 /** Start the read/render thread.
 951  *
 952  * \private \memberof mlt_consumer_s
 953  * \param self a consumer
 954  */
 955
 956 static void consumer_read_ahead_start( mlt_consumer self )
 957 {
 958         // We're running now
 959         self->ahead = 1;
 960
 961         // Create the frame queue
 962         self->queue = mlt_deque_init( );
 963
 964         // Create the queue mutex
 965         pthread_mutex_init( &self->queue_mutex, NULL );
 966
 967         // Create the condition
 968         pthread_cond_init( &self->queue_cond, NULL );
 969
 970         // Create the read ahead
 971         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
 972         {
 973                 struct sched_param priority;
 974                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
 975                 pthread_attr_t thread_attributes;
 976                 pthread_attr_init( &thread_attributes );
 977                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
 978                 pthread_attr_setschedparam( &thread_attributes, &priority );
 979                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
 980                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
 981                 if ( pthread_create( &self->ahead_thread, &thread_attributes, consumer_read_ahead_thread, self ) < 0 )
 982                         pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
 983                 pthread_attr_destroy( &thread_attributes );
 984         }
 985         else
 986         {
 987                 pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
 988         }
 989         self->started = 1;
 990 }
 991
 992 /** Start the worker threads.
 993  *
 994  * \private \memberof mlt_consumer_s
 995  * \param self a consumer
 996  */
 997
 998 static void consumer_work_start( mlt_consumer self )
 999 {
1000         int n = abs( self->real_time );
1001         pthread_t *thread = calloc( 1, sizeof( pthread_t ) * n );
1002
1003         // We're running now
1004         self->ahead = 1;
1005
1006         // These keep track of the accelleration of frame dropping or recovery.
1007         self->consecutive_dropped = 0;
1008         self->consecutive_rendered = 0;
1009
1010         // This is the position in the queue from which to look for a frame to process.
1011         // If we always start from the head, then we may likely not complete processing
1012         // before the frame is played out.
1013         self->process_head = 0;
1014
1015         // Create the queues
1016         self->queue = mlt_deque_init();
1017         self->worker_threads = mlt_deque_init();
1018
1019         // Create the mutexes
1020         pthread_mutex_init( &self->queue_mutex, NULL );
1021         pthread_mutex_init( &self->done_mutex, NULL );
1022
1023         // Create the conditions
1024         pthread_cond_init( &self->queue_cond, NULL );
1025         pthread_cond_init( &self->done_cond, NULL );
1026
1027         // Create the read ahead
1028         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
1029         {
1030
1031                 struct sched_param priority;
1032                 pthread_attr_t thread_attributes;
1033
1034                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
1035                 pthread_attr_init( &thread_attributes );
1036                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
1037                 pthread_attr_setschedparam( &thread_attributes, &priority );
1038                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
1039                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
1040
1041                 while ( n-- )
1042                 {
1043                         if ( pthread_create( thread, &thread_attributes, consumer_worker_thread, self ) < 0 )
1044                                 if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
1045                                         mlt_deque_push_back( self->worker_threads, thread );
1046                         thread++;
1047                 }
1048                 pthread_attr_destroy( &thread_attributes );
1049         }
1050
1051         else
1052         {
1053                 while ( n-- )
1054                 {
1055                         if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
1056                                 mlt_deque_push_back( self->worker_threads, thread );
1057                         thread++;
1058                 }
1059         }
1060         self->started = 1;
1061 }
1062
1063 /** Stop the read/render thread.
1064  *
1065  * \private \memberof mlt_consumer_s
1066  * \param self a consumer
1067  */
1068
1069 static void consumer_read_ahead_stop( mlt_consumer self )
1070 {
1071         // Make sure we're running
1072         if ( self->started )
1073         {
1074                 // Inform thread to stop
1075                 self->ahead = 0;
1076
1077                 // Broadcast to the condition in case it's waiting
1078                 pthread_mutex_lock( &self->queue_mutex );
1079                 pthread_cond_broadcast( &self->queue_cond );
1080                 pthread_mutex_unlock( &self->queue_mutex );
1081
1082                 // Broadcast to the put condition in case it's waiting
1083                 pthread_mutex_lock( &self->put_mutex );
1084                 pthread_cond_broadcast( &self->put_cond );
1085                 pthread_mutex_unlock( &self->put_mutex );
1086
1087                 // Join the thread
1088                 pthread_join( self->ahead_thread, NULL );
1089                 self->started = 0;
1090
1091                 // Destroy the frame queue mutex
1092                 pthread_mutex_destroy( &self->queue_mutex );
1093
1094                 // Destroy the condition
1095                 pthread_cond_destroy( &self->queue_cond );
1096
1097                 // Wipe the queue
1098                 while ( mlt_deque_count( self->queue ) )
1099                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1100
1101                 // Close the queue
1102                 mlt_deque_close( self->queue );
1103         }
1104 }
1105
1106 /** Stop the worker threads.
1107  *
1108  * \private \memberof mlt_consumer_s
1109  * \param self a consumer
1110  */
1111
1112 static void consumer_work_stop( mlt_consumer self )
1113 {
1114         // Make sure we're running
1115         if ( self->started )
1116         {
1117                 // Inform thread to stop
1118                 self->ahead = 0;
1119
1120                 // Broadcast to the queue condition in case it's waiting
1121                 pthread_mutex_lock( &self->queue_mutex );
1122                 pthread_cond_broadcast( &self->queue_cond );
1123                 pthread_mutex_unlock( &self->queue_mutex );
1124
1125                 // Broadcast to the put condition in case it's waiting
1126                 pthread_mutex_lock( &self->put_mutex );
1127                 pthread_cond_broadcast( &self->put_cond );
1128                 pthread_mutex_unlock( &self->put_mutex );
1129
1130                 // Broadcast to the done condition in case it's waiting
1131                 pthread_mutex_lock( &self->done_mutex );
1132                 pthread_cond_broadcast( &self->done_cond );
1133                 pthread_mutex_unlock( &self->done_mutex );
1134
1135                 // Join the threads
1136                 pthread_t *thread;
1137                 while ( ( thread = mlt_deque_pop_back( self->worker_threads ) ) )
1138                         pthread_join( *thread, NULL );
1139
1140                 // Deallocate the array of threads
1141                 if ( thread )
1142                         free( thread );
1143
1144                 // Indicate that worker threads no longer running
1145                 self->started = 0;
1146
1147                 // Destroy the mutexes
1148                 pthread_mutex_destroy( &self->queue_mutex );
1149                 pthread_mutex_destroy( &self->done_mutex );
1150
1151                 // Destroy the conditions
1152                 pthread_cond_destroy( &self->queue_cond );
1153                 pthread_cond_destroy( &self->done_cond );
1154
1155                 // Wipe the queues
1156                 while ( mlt_deque_count( self->queue ) )
1157                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1158
1159                 // Close the queues
1160                 mlt_deque_close( self->queue );
1161                 mlt_deque_close( self->worker_threads );
1162         }
1163 }
1164
1165 /** Flush the read/render thread's buffer.
1166  *
1167  * \public \memberof mlt_consumer_s
1168  * \param self a consumer
1169  */
1170
1171 void mlt_consumer_purge( mlt_consumer self )
1172 {
1173         if ( self->ahead )
1174         {
1175                 pthread_mutex_lock( &self->queue_mutex );
1176                 while ( mlt_deque_count( self->queue ) )
1177                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1178                 pthread_cond_broadcast( &self->queue_cond );
1179                 pthread_mutex_unlock( &self->queue_mutex );
1180         }
1181 }
1182
1183 /** Use multiple worker threads and a work queue.
1184  */
1185
1186 static mlt_frame worker_get_frame( mlt_consumer self, mlt_properties properties )
1187 {
1188         // Frame to return
1189         mlt_frame frame = NULL;
1190
1191         double fps = mlt_properties_get_double( properties, "fps" );
1192         int threads = abs( self->real_time );
1193         int buffer = mlt_properties_get_int( properties, "_buffer" );
1194         buffer = buffer > 0 ? buffer : mlt_properties_get_int( properties, "buffer" );
1195         // This is a heuristic to determine a suitable minimum buffer size for the number of threads.
1196         int headroom = 2 + threads * threads;
1197         buffer = buffer < headroom ? headroom : buffer;
1198
1199         // Start worker threads if not already started.
1200         if ( ! self->ahead )
1201         {
1202                 int prefill = mlt_properties_get_int( properties, "prefill" );
1203                 prefill = prefill > 0 && prefill < buffer ? prefill : buffer;
1204
1205                 consumer_work_start( self );
1206
1207                 // Fill the work queue.
1208                 int i = buffer;
1209                 while ( self->ahead && i-- )
1210                 {
1211                         frame = mlt_consumer_get_frame( self );
1212                         if ( frame )
1213                         {
1214                                 pthread_mutex_lock( &self->queue_mutex );
1215                                 mlt_deque_push_back( self->queue, frame );
1216                                 pthread_cond_signal( &self->queue_cond );
1217                                 pthread_mutex_unlock( &self->queue_mutex );
1218                         }
1219                 }
1220
1221                 // Wait for prefill
1222                 while ( self->ahead && first_unprocessed_frame( self ) < prefill )
1223                 {
1224                         pthread_mutex_lock( &self->done_mutex );
1225                         pthread_cond_wait( &self->done_cond, &self->done_mutex );
1226                         pthread_mutex_unlock( &self->done_mutex );
1227                 }
1228                 self->process_head = threads;
1229         }
1230
1231 //      mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "size %d done count %d work count %d process_head %d\n",
1232 //              threads, first_unprocessed_frame( self ), mlt_deque_count( self->queue ), self->process_head );
1233
1234         // Feed the work queue
1235         while ( self->ahead && mlt_deque_count( self->queue ) < buffer )
1236         {
1237                 frame = mlt_consumer_get_frame( self );
1238                 if ( ! frame )
1239                         return frame;
1240                 pthread_mutex_lock( &self->queue_mutex );
1241                 mlt_deque_push_back( self->queue, frame );
1242                 pthread_cond_signal( &self->queue_cond );
1243                 pthread_mutex_unlock( &self->queue_mutex );
1244         }
1245
1246         // Wait if not realtime.
1247         mlt_frame head_frame = MLT_FRAME( mlt_deque_peek_front( self->queue ) );
1248         while ( self->ahead && self->real_time < 0 &&
1249                 !( head_frame && mlt_properties_get_int( MLT_FRAME_PROPERTIES( head_frame ), "rendered" ) ) )
1250         {
1251                 pthread_mutex_lock( &self->done_mutex );
1252                 pthread_cond_wait( &self->done_cond, &self->done_mutex );
1253                 pthread_mutex_unlock( &self->done_mutex );
1254         }
1255
1256         // Get the frame from the queue.
1257         pthread_mutex_lock( &self->queue_mutex );
1258         frame = mlt_deque_pop_front( self->queue );
1259         pthread_mutex_unlock( &self->queue_mutex );
1260
1261         // Adapt the worker process head to the runtime conditions.
1262         if ( self->real_time > 0 )
1263         {
1264                 if ( frame && mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered" ) )
1265                 {
1266                         self->consecutive_dropped = 0;
1267                         if ( self->process_head > threads && self->consecutive_rendered >= self->process_head )
1268                                 self->process_head--;
1269                         else
1270                                 self->consecutive_rendered++;
1271                 }
1272                 else
1273                 {
1274                         self->consecutive_rendered = 0;
1275                         if ( self->process_head < buffer - threads && self->consecutive_dropped > threads )
1276                                 self->process_head++;
1277                         else
1278                                 self->consecutive_dropped++;
1279                 }
1280 //              mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "dropped %d rendered %d process_head %d\n",
1281 //                      self->consecutive_dropped, self->consecutive_rendered, self->process_head );
1282
1283                 // Check for too many consecutively dropped frames
1284                 if ( self->consecutive_dropped > mlt_properties_get_int( properties, "drop_max" ) )
1285                 {
1286                         int orig_buffer = mlt_properties_get_int( properties, "buffer" );
1287                         int prefill = mlt_properties_get_int( properties, "prefill" );
1288                         mlt_log_verbose( self, "too many frames dropped - " );
1289
1290                         // If using a default low-latency buffer level (SDL) and below the limit
1291                         if ( ( orig_buffer == 1 || prefill == 1 ) && buffer < (threads + 1) * 10 )
1292                         {
1293                                 // Auto-scale the buffer to compensate
1294                                 mlt_log_verbose( self, "increasing buffer to %d\n", buffer + threads );
1295                                 mlt_properties_set_int( properties, "_buffer", buffer + threads );
1296                                 self->consecutive_dropped = fps / 2;
1297                         }
1298                         else
1299                         {
1300                                 // Tell the consumer to render it
1301                                 mlt_log_verbose( self, "forcing next frame\n" );
1302                                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
1303                                 self->consecutive_dropped = 0;
1304                         }
1305                 }
1306         }
1307
1308         return frame;
1309 }
1310
1311 /** Get the next frame from the producer connected to a consumer.
1312  *
1313  * Typically, one uses this instead of \p mlt_consumer_get_frame to make
1314  * the asynchronous/real-time behavior configurable at runtime.
1315  * You should close the frame returned from this when you are done with it.
1316  *
1317  * \public \memberof mlt_consumer_s
1318  * \param self a consumer
1319  * \return a frame
1320  */
1321
1322 mlt_frame mlt_consumer_rt_frame( mlt_consumer self )
1323 {
1324         // Frame to return
1325         mlt_frame frame = NULL;
1326
1327         // Get the properties
1328         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1329
1330         // Check if the user has requested real time or not
1331         if ( self->real_time > 1 || self->real_time < -1 )
1332         {
1333                 // see above
1334                 return worker_get_frame( self, properties );
1335         }
1336         else if ( self->real_time == 1 || self->real_time == -1 )
1337         {
1338                 int size = 1;
1339
1340                 // Is the read ahead running?
1341                 if ( self->ahead == 0 )
1342                 {
1343                         int buffer = mlt_properties_get_int( properties, "buffer" );
1344                         int prefill = mlt_properties_get_int( properties, "prefill" );
1345                         consumer_read_ahead_start( self );
1346                         if ( buffer > 1 )
1347                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
1348                 }
1349
1350                 // Get frame from queue
1351                 pthread_mutex_lock( &self->queue_mutex );
1352                 while( self->ahead && mlt_deque_count( self->queue ) < size )
1353                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
1354                 frame = mlt_deque_pop_front( self->queue );
1355                 pthread_cond_broadcast( &self->queue_cond );
1356                 pthread_mutex_unlock( &self->queue_mutex );
1357         }
1358         else // real_time == 0
1359         {
1360                 // Get the frame in non real time
1361                 frame = mlt_consumer_get_frame( self );
1362
1363                 // This isn't true, but from the consumers perspective it is
1364                 if ( frame != NULL )
1365                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
1366         }
1367
1368         return frame;
1369 }
1370
1371 /** Callback for the implementation to indicate a stopped condition.
1372  *
1373  * \public \memberof mlt_consumer_s
1374  * \param self a consumer
1375  */
1376
1377 void mlt_consumer_stopped( mlt_consumer self )
1378 {
1379         mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( self ), "running", 0 );
1380         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-stopped", NULL );
1381         mlt_event_unblock( self->event_listener );
1382 }
1383
1384 /** Stop the consumer.
1385  *
1386  * \public \memberof mlt_consumer_s
1387  * \param self a consumer
1388  * \return true if there was an error
1389  */
1390
1391 int mlt_consumer_stop( mlt_consumer self )
1392 {
1393         // Get the properies
1394         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1395
1396         // Just in case...
1397         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping put waiting\n" );
1398         pthread_mutex_lock( &self->put_mutex );
1399         self->put_active = 0;
1400         pthread_cond_broadcast( &self->put_cond );
1401         pthread_mutex_unlock( &self->put_mutex );
1402
1403         // Stop the consumer
1404         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping consumer\n" );
1405
1406         // Cancel the read ahead threads
1407         self->ahead = 0;
1408         if ( self->started )
1409         {
1410                 // Unblock the consumer calling mlt_consumer_rt_frame
1411                 pthread_mutex_lock( &self->queue_mutex );
1412                 pthread_cond_broadcast( &self->queue_cond );
1413                 pthread_mutex_unlock( &self->queue_mutex );
1414         }
1415
1416         // Invoke the child callback
1417         if ( self->stop != NULL )
1418                 self->stop( self );
1419
1420         // Check if the user has requested real time or not and stop if necessary
1421         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping read_ahead\n" );
1422         if ( abs( self->real_time ) == 1 )
1423                 consumer_read_ahead_stop( self );
1424         else if ( abs( self->real_time ) > 1 )
1425                 consumer_work_stop( self );
1426
1427         // Kill the test card
1428         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
1429
1430         // Check and run a post command
1431         if ( mlt_properties_get( properties, "post" ) )
1432                 if (system( mlt_properties_get( properties, "post" ) ) == -1 )
1433                         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "post" ) );
1434
1435         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopped\n" );
1436
1437         return 0;
1438 }
1439
1440 /** Determine if the consumer is stopped.
1441  *
1442  * \public \memberof mlt_consumer_s
1443  * \param self a consumer
1444  * \return true if the consumer is stopped
1445  */
1446
1447 int mlt_consumer_is_stopped( mlt_consumer self )
1448 {
1449         // Check if the consumer is stopped
1450         if ( self->is_stopped != NULL )
1451                 return self->is_stopped( self );
1452
1453         return 0;
1454 }
1455
1456 /** Close and destroy the consumer.
1457  *
1458  * \public \memberof mlt_consumer_s
1459  * \param self a consumer
1460  */
1461
1462 void mlt_consumer_close( mlt_consumer self )
1463 {
1464         if ( self != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( self ) ) <= 0 )
1465         {
1466                 // Get the childs close function
1467                 void ( *consumer_close )( ) = self->close;
1468
1469                 if ( consumer_close )
1470                 {
1471                         // Just in case...
1472                         //mlt_consumer_stop( self );
1473
1474                         self->close = NULL;
1475                         consumer_close( self );
1476                 }
1477                 else
1478                 {
1479                         // Make sure it only gets called once
1480                         self->parent.close = NULL;
1481
1482                         // Destroy the push mutex and condition
1483                         pthread_mutex_destroy( &self->put_mutex );
1484                         pthread_cond_destroy( &self->put_cond );
1485
1486                         mlt_service_close( &self->parent );
1487                 }
1488         }
1489 }
1490
1491 /** Get the position of the last frame shown.
1492  *
1493  * \public \memberof mlt_consumer_s
1494  * \param consumer a consumer
1495  * \return the position
1496  */
1497
1498 mlt_position mlt_consumer_position( mlt_consumer consumer )
1499 {
1500         return consumer->position;
1501 }
1502