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
  90                 // Default audio frequency and channels
  91                 mlt_properties_set_int( properties, "frequency", 48000 );
  92                 mlt_properties_set_int( properties, "channels", 2 );
  93
  94                 // Default of all consumers is real time
  95                 mlt_properties_set_int( properties, "real_time", 1 );
  96
  97                 // Default to environment test card
  98                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
  99
 100                 // Hmm - default all consumers to yuv422 :-/
 101                 self->format = mlt_image_yuv422;
 102
 103                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
 104                 mlt_events_register( properties, "consumer-frame-render", ( mlt_transmitter )mlt_consumer_frame_render );
 105                 mlt_events_register( properties, "consumer-stopped", NULL );
 106                 mlt_events_listen( properties, self, "consumer-frame-show", ( mlt_listener )on_consumer_frame_show );
 107
 108                 // Register a property-changed listener to handle the profile property -
 109                 // subsequent properties can override the profile
 110                 self->event_listener = mlt_events_listen( properties, self, "property-changed", ( mlt_listener )mlt_consumer_property_changed );
 111
 112                 // Create the push mutex and condition
 113                 pthread_mutex_init( &self->put_mutex, NULL );
 114                 pthread_cond_init( &self->put_cond, NULL );
 115
 116         }
 117         return error;
 118 }
 119
 120 /** Convert the profile into properties on the consumer.
 121  *
 122  * \private \memberof mlt_consumer_s
 123  * \param self a consumer
 124  * \param profile a profile
 125  * \param properties a properties list (typically, the consumer's)
 126  */
 127
 128 static void apply_profile_properties( mlt_consumer self, mlt_profile profile, mlt_properties properties )
 129 {
 130         mlt_event_block( self->event_listener );
 131         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 132         mlt_properties_set_int( properties, "frame_rate_num", profile->frame_rate_num );
 133         mlt_properties_set_int( properties, "frame_rate_den", profile->frame_rate_den );
 134         mlt_properties_set_int( properties, "width", profile->width );
 135         mlt_properties_set_int( properties, "height", profile->height );
 136         mlt_properties_set_int( properties, "progressive", profile->progressive );
 137         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 138         mlt_properties_set_int( properties, "sample_aspect_num", profile->sample_aspect_num );
 139         mlt_properties_set_int( properties, "sample_aspect_den", profile->sample_aspect_den );
 140         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 141         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 142         mlt_properties_set_int( properties, "display_aspect_num", profile->display_aspect_num );
 143         mlt_properties_set_int( properties, "colorspace", profile->colorspace );
 144         mlt_event_unblock( self->event_listener );
 145 }
 146
 147 /** The property-changed event listener
 148  *
 149  * \private \memberof mlt_consumer_s
 150  * \param owner the events object
 151  * \param self the consumer
 152  * \param name the name of the property that changed
 153  */
 154
 155 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer self, char *name )
 156 {
 157         if ( !strcmp( name, "profile" ) )
 158         {
 159                 // Get the properies
 160                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 161
 162                 // Get the current profile
 163                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 164
 165                 // Load the new profile
 166                 mlt_profile new_profile = mlt_profile_init( mlt_properties_get( properties, name ) );
 167
 168                 if ( new_profile )
 169                 {
 170                         // Copy the profile
 171                         if ( profile != NULL )
 172                         {
 173                                 free( profile->description );
 174                                 memcpy( profile, new_profile, sizeof( struct mlt_profile_s ) );
 175                                 profile->description = strdup( new_profile->description );
 176                                 mlt_profile_close( new_profile );
 177                         }
 178                         else
 179                         {
 180                                 profile = new_profile;
 181                         }
 182
 183                         // Apply to properties
 184                         apply_profile_properties( self, profile, properties );
 185                 }
 186         }
 187         else if ( !strcmp( name, "frame_rate_num" ) )
 188         {
 189                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 190                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 191                 if ( profile )
 192                 {
 193                         profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
 194                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 195                 }
 196         }
 197         else if ( !strcmp( name, "frame_rate_den" ) )
 198         {
 199                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 200                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 201                 if ( profile )
 202                 {
 203                         profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
 204                         mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
 205                 }
 206         }
 207         else if ( !strcmp( name, "width" ) )
 208         {
 209                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 210                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 211                 if ( profile )
 212                         profile->width = mlt_properties_get_int( properties, "width" );
 213         }
 214         else if ( !strcmp( name, "height" ) )
 215         {
 216                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 217                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 218                 if ( profile )
 219                         profile->height = mlt_properties_get_int( properties, "height" );
 220         }
 221         else if ( !strcmp( name, "progressive" ) )
 222         {
 223                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 224                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 225                 if ( profile )
 226                         profile->progressive = mlt_properties_get_int( properties, "progressive" );
 227         }
 228         else if ( !strcmp( name, "sample_aspect_num" ) )
 229         {
 230                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 231                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 232                 profile->sample_aspect_num = mlt_properties_get_int( properties, "sample_aspect_num" );
 233                 if ( profile )
 234                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 235         }
 236         else if ( !strcmp( name, "sample_aspect_den" ) )
 237         {
 238                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 239                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 240                 profile->sample_aspect_den = mlt_properties_get_int( properties, "sample_aspect_den" );
 241                 if ( profile )
 242                         mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile )  );
 243         }
 244         else if ( !strcmp( name, "display_aspect_num" ) )
 245         {
 246                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 247                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 248                 if ( profile )
 249                 {
 250                         profile->display_aspect_num = mlt_properties_get_int( properties, "display_aspect_num" );
 251                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 252                 }
 253         }
 254         else if ( !strcmp( name, "display_aspect_den" ) )
 255         {
 256                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 257                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 258                 if ( profile )
 259                 {
 260                         profile->display_aspect_den = mlt_properties_get_int( properties, "display_aspect_den" );
 261                         mlt_properties_set_double( properties, "display_ratio", mlt_profile_dar( profile )  );
 262                 }
 263         }
 264         else if ( !strcmp( name, "colorspace" ) )
 265         {
 266                 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 267                 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
 268                 if ( profile )
 269                         profile->colorspace = mlt_properties_get_int( properties, "colorspace" );
 270         }
 271 }
 272
 273 /** The transmitter for the consumer-frame-show event
 274  *
 275  * Invokes the listener.
 276  *
 277  * \private \memberof mlt_consumer_s
 278  * \param listener a function pointer that will be invoked
 279  * \param owner the events object that will be passed to \p listener
 280  * \param self  a service that will be passed to \p listener
 281  * \param args an array of pointers - the first entry is passed as a string to \p listener
 282  */
 283
 284 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
 285 {
 286         if ( listener != NULL )
 287                 listener( owner, self, ( mlt_frame )args[ 0 ] );
 288 }
 289
 290 /** The transmitter for the consumer-frame-render event
 291  *
 292  * Invokes the listener.
 293  *
 294  * \private \memberof mlt_consumer_s
 295  * \param listener a function pointer that will be invoked
 296  * \param owner the events object that will be passed to \p listener
 297  * \param self  a service that will be passed to \p listener
 298  * \param args an array of pointers - the first entry is passed as a string to \p listener
 299  */
 300
 301 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
 302 {
 303         if ( listener != NULL )
 304                 listener( owner, self, ( mlt_frame )args[ 0 ] );
 305 }
 306
 307 /** A listener on the consumer-frame-show event
 308  *
 309  * Saves the position of the frame shown.
 310  *
 311  * \private \memberof mlt_consumer_s
 312  * \param owner the events object
 313  * \param consumer the consumer on which this event occurred
 314  * \param frame the frame that was shown
 315  */
 316
 317 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer consumer, mlt_frame frame )
 318 {
 319         if ( frame )
 320                 consumer->position = mlt_frame_get_position( frame );
 321 }
 322
 323 /** Create a new consumer.
 324  *
 325  * \public \memberof mlt_consumer_s
 326  * \param profile a profile (optional, but recommended)
 327  * \return a new consumer
 328  */
 329
 330 mlt_consumer mlt_consumer_new( mlt_profile profile )
 331 {
 332         // Create the memory for the structure
 333         mlt_consumer self = malloc( sizeof( struct mlt_consumer_s ) );
 334
 335         // Initialise it
 336         if ( self != NULL )
 337                 mlt_consumer_init( self, NULL, profile );
 338
 339         // Return it
 340         return self;
 341 }
 342
 343 /** Get the parent service object.
 344  *
 345  * \public \memberof mlt_consumer_s
 346  * \param self a consumer
 347  * \return the parent service class
 348  * \see MLT_CONSUMER_SERVICE
 349  */
 350
 351 mlt_service mlt_consumer_service( mlt_consumer self )
 352 {
 353         return self != NULL ? &self->parent : NULL;
 354 }
 355
 356 /** Get the consumer properties.
 357  *
 358  * \public \memberof mlt_consumer_s
 359  * \param self a consumer
 360  * \return the consumer's properties list
 361  * \see MLT_CONSUMER_PROPERTIES
 362  */
 363
 364 mlt_properties mlt_consumer_properties( mlt_consumer self )
 365 {
 366         return self != NULL ? MLT_SERVICE_PROPERTIES( &self->parent ) : NULL;
 367 }
 368
 369 /** Connect the consumer to the producer.
 370  *
 371  * \public \memberof mlt_consumer_s
 372  * \param self a consumer
 373  * \param producer a producer
 374  * \return > 0 warning, == 0 success, < 0 serious error,
 375  *         1 = this service does not accept input,
 376  *         2 = the producer is invalid,
 377  *         3 = the producer is already registered with this consumer
 378  */
 379
 380 int mlt_consumer_connect( mlt_consumer self, mlt_service producer )
 381 {
 382         return mlt_service_connect_producer( &self->parent, producer, 0 );
 383 }
 384
 385 /** Start the consumer.
 386  *
 387  * \public \memberof mlt_consumer_s
 388  * \param self a consumer
 389  * \return true if there was an error
 390  */
 391
 392 int mlt_consumer_start( mlt_consumer self )
 393 {
 394         // Stop listening to the property-changed event
 395         mlt_event_block( self->event_listener );
 396
 397         // Get the properies
 398         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 399
 400         // Determine if there's a test card producer
 401         char *test_card = mlt_properties_get( properties, "test_card" );
 402
 403         // Just to make sure nothing is hanging around...
 404         self->put = NULL;
 405         self->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( self ) );
 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( self ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "ante" ) );
 444
 445         // Set the real_time preference
 446         self->real_time = mlt_properties_get_int( properties, "real_time" );
 447
 448         // For worker threads implementation, buffer must be at least # threads
 449         if ( abs( self->real_time ) > 1 && mlt_properties_get_int( properties, "buffer" ) <= abs( self->real_time ) )
 450                 mlt_properties_set_int( properties, "buffer", abs( self->real_time ) + 1 );
 451
 452         // Start the service
 453         if ( self->start != NULL )
 454                 return self->start( self );
 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 self a consumer
 465  * \param frame a frame
 466  * \return true (ignore self for now)
 467  */
 468
 469 int mlt_consumer_put_frame( mlt_consumer self, mlt_frame frame )
 470 {
 471         int error = 1;
 472
 473         // Get the service assoicated to the consumer
 474         mlt_service service = MLT_CONSUMER_SERVICE( self );
 475
 476         if ( mlt_service_producer( service ) == NULL )
 477         {
 478                 struct timeval now;
 479                 struct timespec tm;
 480                 pthread_mutex_lock( &self->put_mutex );
 481                 while ( self->put_active && self->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( &self->put_cond, &self->put_mutex, &tm );
 487                 }
 488                 if ( self->put_active && self->put == NULL )
 489                         self->put = frame;
 490                 else
 491                         mlt_frame_close( frame );
 492                 pthread_cond_broadcast( &self->put_cond );
 493                 pthread_mutex_unlock( &self->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 self a consumer
 507  * \return a frame
 508  */
 509
 510 mlt_frame mlt_consumer_get_frame( mlt_consumer self )
 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( self );
 517
 518         // Get the consumer properties
 519         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 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( &self->put_mutex );
 527                 while ( self->put_active && self->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( &self->put_cond, &self->put_mutex, &tm );
 533                 }
 534                 frame = self->put;
 535                 self->put = NULL;
 536                 pthread_cond_broadcast( &self->put_cond );
 537                 pthread_mutex_unlock( &self->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 self = arg;
 602
 603         // Get the properties of the consumer
 604         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 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
 645         if ( preview_off && preview_format != 0 )
 646                 self->format = preview_format;
 647
 648         // Get the first frame
 649         frame = mlt_consumer_get_frame( self );
 650
 651         if ( frame )
 652         {
 653                 // Get the image of the first frame
 654                 if ( !video_off )
 655                 {
 656                         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 657                         mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
 658                 }
 659
 660                 if ( !audio_off )
 661                 {
 662                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 663                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 664                 }
 665
 666                 // Mark as rendered
 667                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 668         }
 669
 670         // Get the starting time (can ignore the times above)
 671         gettimeofday( &ante, NULL );
 672
 673         // Continue to read ahead
 674         while ( self->ahead )
 675         {
 676                 // Fetch width/height again
 677                 width = mlt_properties_get_int( properties, "width" );
 678                 height = mlt_properties_get_int( properties, "height" );
 679
 680                 // Put the current frame into the queue
 681                 pthread_mutex_lock( &self->queue_mutex );
 682                 while( self->ahead && mlt_deque_count( self->queue ) >= buffer )
 683                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
 684                 mlt_deque_push_back( self->queue, frame );
 685                 pthread_cond_broadcast( &self->queue_cond );
 686                 pthread_mutex_unlock( &self->queue_mutex );
 687
 688                 time_wait += time_difference( &ante );
 689
 690                 // Get the next frame
 691                 frame = mlt_consumer_get_frame( self );
 692                 time_frame += time_difference( &ante );
 693
 694                 // If there's no frame, we're probably stopped...
 695                 if ( frame == NULL )
 696                         continue;
 697
 698                 // Increment the count
 699                 count ++;
 700
 701                 // All non normal playback frames should be shown
 702                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 703                 {
 704 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 705                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 706 #endif
 707                         skipped = 0;
 708                         time_frame = 0;
 709                         time_process = 0;
 710                         time_wait = 0;
 711                         count = 1;
 712                         skip_next = 0;
 713                 }
 714
 715                 // Get the image
 716                 if ( !skip_next || self->real_time == -1 )
 717                 {
 718                         // Get the image, mark as rendered and time it
 719                         if ( !video_off )
 720                         {
 721                                 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 722                                 mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
 723                         }
 724                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 725                 }
 726                 else
 727                 {
 728                         // Increment the number of sequentially skipped frames
 729                         skipped ++;
 730                         skip_next = 0;
 731
 732                         // If we've reached an unacceptable level, reset everything
 733                         if ( skipped > 5 )
 734                         {
 735                                 skipped = 0;
 736                                 time_frame = 0;
 737                                 time_process = 0;
 738                                 time_wait = 0;
 739                                 count = 1;
 740                         }
 741                 }
 742
 743                 // Always process audio
 744                 if ( !audio_off )
 745                 {
 746                         samples = mlt_sample_calculator( fps, frequency, counter++ );
 747                         mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
 748                 }
 749
 750                 // Increment the time take for self frame
 751                 time_process += time_difference( &ante );
 752
 753                 // Determine if the next frame should be skipped
 754                 if ( mlt_deque_count( self->queue ) <= 5 )
 755                 {
 756                         int frame_duration = mlt_properties_get_int( properties, "frame_duration" );
 757                         if ( ( ( time_wait + time_frame + time_process ) / count ) > frame_duration )
 758                                 skip_next = 1;
 759                 }
 760         }
 761
 762         // Remove the last frame
 763         mlt_frame_close( frame );
 764
 765         return NULL;
 766 }
 767
 768 /** Locate the first unprocessed frame in the queue.
 769  *
 770  * When playing with realtime behavior, we do not use the true head, but
 771  * rather an adjusted process_head. The process_head is adjusted based on
 772  * the rate of frame-dropping or recovery from frame-dropping. The idea is
 773  * that as the level of frame-dropping increases to move the process_head
 774  * closer to the tail because the frames are not completing processing prior
 775  * to their playout! Then, as frames are not dropped the process_head moves
 776  * back closer to the head of the queue so that worker threads can work
 777  * ahead of the playout point (queue head).
 778  *
 779  * \private \memberof mlt_consumer_s
 780  * \param self a consumer
 781  * \return an index into the queue
 782  */
 783
 784 static inline int first_unprocessed_frame( mlt_consumer self )
 785 {
 786         int index = self->real_time <= 0 ? 0 : self->process_head;
 787         while ( index < mlt_deque_count( self->queue ) && MLT_FRAME( mlt_deque_peek( self->queue, index ) )->is_processing )
 788                 index++;
 789         return index;
 790 }
 791
 792 /** The worker thread procedure for parallel processing frames.
 793  *
 794  * \private \memberof mlt_consumer_s
 795  * \param arg a consumer
 796  */
 797
 798 static void *consumer_worker_thread( void *arg )
 799 {
 800         // The argument is the consumer
 801         mlt_consumer self = arg;
 802
 803         // Get the properties of the consumer
 804         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
 805
 806         // Get the width and height
 807         int width = mlt_properties_get_int( properties, "width" );
 808         int height = mlt_properties_get_int( properties, "height" );
 809         mlt_image_format format = self->format;
 810
 811         // See if video is turned off
 812         int video_off = mlt_properties_get_int( properties, "video_off" );
 813         int preview_off = mlt_properties_get_int( properties, "preview_off" );
 814         int preview_format = mlt_properties_get_int( properties, "preview_format" );
 815
 816         // General frame variable
 817         mlt_frame frame = NULL;
 818         uint8_t *image = NULL;
 819
 820         if ( preview_off && preview_format != 0 )
 821                 format = preview_format;
 822
 823         // Continue to read ahead
 824         while ( self->ahead )
 825         {
 826                 // Get the next unprocessed frame from the work queue
 827                 pthread_mutex_lock( &self->queue_mutex );
 828                 int index = first_unprocessed_frame( self );
 829                 while ( self->ahead && index >= mlt_deque_count( self->queue ) )
 830                 {
 831                         mlt_log_debug( MLT_CONSUMER_SERVICE(self), "waiting in worker index = %d queue count = %d\n",
 832                                 index, mlt_deque_count( self->queue ) );
 833                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
 834                         index = first_unprocessed_frame( self );
 835                 }
 836
 837                 // Mark the frame for processing
 838                 frame = mlt_deque_peek( self->queue, index );
 839                 if ( frame )
 840                 {
 841                         mlt_log_debug( MLT_CONSUMER_SERVICE(self), "worker processing index = %d frame %d queue count = %d\n",
 842                                 index, mlt_frame_get_position(frame), mlt_deque_count( self->queue ) );
 843                         frame->is_processing = 1;
 844                         mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( frame ) );
 845                 }
 846                 pthread_mutex_unlock( &self->queue_mutex );
 847
 848                 // If there's no frame, we're probably stopped...
 849                 if ( frame == NULL )
 850                         continue;
 851
 852 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
 853                 // All non normal playback frames should be shown
 854                 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
 855                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
 856 #endif
 857
 858                 // Get the image
 859                 if ( !video_off )
 860                 {
 861                         // Fetch width/height again
 862                         width = mlt_properties_get_int( properties, "width" );
 863                         height = mlt_properties_get_int( properties, "height" );
 864                         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
 865                         mlt_frame_get_image( frame, &image, &format, &width, &height, 0 );
 866                 }
 867                 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
 868                 mlt_frame_close( frame );
 869
 870                 // Tell a waiting thread (non-realtime main consumer thread) that we are done.
 871                 pthread_mutex_lock( &self->done_mutex );
 872                 pthread_cond_broadcast( &self->done_cond );
 873                 pthread_mutex_unlock( &self->done_mutex );
 874         }
 875
 876         return NULL;
 877 }
 878
 879 /** Start the read/render thread.
 880  *
 881  * \private \memberof mlt_consumer_s
 882  * \param self a consumer
 883  */
 884
 885 static void consumer_read_ahead_start( mlt_consumer self )
 886 {
 887         // We're running now
 888         self->ahead = 1;
 889
 890         // Create the frame queue
 891         self->queue = mlt_deque_init( );
 892
 893         // Create the queue mutex
 894         pthread_mutex_init( &self->queue_mutex, NULL );
 895
 896         // Create the condition
 897         pthread_cond_init( &self->queue_cond, NULL );
 898
 899         // Create the read ahead
 900         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
 901         {
 902                 struct sched_param priority;
 903                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
 904                 pthread_attr_t thread_attributes;
 905                 pthread_attr_init( &thread_attributes );
 906                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
 907                 pthread_attr_setschedparam( &thread_attributes, &priority );
 908                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
 909                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
 910                 if ( pthread_create( &self->ahead_thread, &thread_attributes, consumer_read_ahead_thread, self ) < 0 )
 911                         pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
 912                 pthread_attr_destroy( &thread_attributes );
 913         }
 914         else
 915         {
 916                 pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
 917         }
 918         self->started = 1;
 919 }
 920
 921 /** Start the worker threads.
 922  *
 923  * \private \memberof mlt_consumer_s
 924  * \param self a consumer
 925  */
 926
 927 static void consumer_work_start( mlt_consumer self )
 928 {
 929         int n = abs( self->real_time );
 930         pthread_t *thread = calloc( 1, sizeof( pthread_t ) * n );
 931
 932         // We're running now
 933         self->ahead = 1;
 934
 935         // These keep track of the accelleration of frame dropping or recovery.
 936         self->consecutive_dropped = 0;
 937         self->consecutive_rendered = 0;
 938
 939         // This is the position in the queue from which to look for a frame to process.
 940         // If we always start from the head, then we may likely not complete processing
 941         // before the frame is played out.
 942         self->process_head = 0;
 943
 944         // Create the queues
 945         self->queue = mlt_deque_init();
 946         self->worker_threads = mlt_deque_init();
 947
 948         // Create the mutexes
 949         pthread_mutex_init( &self->queue_mutex, NULL );
 950         pthread_mutex_init( &self->done_mutex, NULL );
 951
 952         // Create the conditions
 953         pthread_cond_init( &self->queue_cond, NULL );
 954         pthread_cond_init( &self->done_cond, NULL );
 955
 956         // Create the read ahead
 957         if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
 958         {
 959
 960                 struct sched_param priority;
 961                 pthread_attr_t thread_attributes;
 962
 963                 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
 964                 pthread_attr_init( &thread_attributes );
 965                 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
 966                 pthread_attr_setschedparam( &thread_attributes, &priority );
 967                 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
 968                 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
 969
 970                 while ( n-- )
 971                 {
 972                         if ( pthread_create( thread, &thread_attributes, consumer_worker_thread, self ) < 0 )
 973                                 if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
 974                                         mlt_deque_push_back( self->worker_threads, thread );
 975                         thread++;
 976                 }
 977                 pthread_attr_destroy( &thread_attributes );
 978         }
 979
 980         else
 981         {
 982                 while ( n-- )
 983                 {
 984                         if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
 985                                 mlt_deque_push_back( self->worker_threads, thread );
 986                         thread++;
 987                 }
 988         }
 989         self->started = 1;
 990 }
 991
 992 /** Stop the read/render thread.
 993  *
 994  * \private \memberof mlt_consumer_s
 995  * \param self a consumer
 996  */
 997
 998 static void consumer_read_ahead_stop( mlt_consumer self )
 999 {
1000         // Make sure we're running
1001         if ( self->started )
1002         {
1003                 // Inform thread to stop
1004                 self->ahead = 0;
1005
1006                 // Broadcast to the condition in case it's waiting
1007                 pthread_mutex_lock( &self->queue_mutex );
1008                 pthread_cond_broadcast( &self->queue_cond );
1009                 pthread_mutex_unlock( &self->queue_mutex );
1010
1011                 // Broadcast to the put condition in case it's waiting
1012                 pthread_mutex_lock( &self->put_mutex );
1013                 pthread_cond_broadcast( &self->put_cond );
1014                 pthread_mutex_unlock( &self->put_mutex );
1015
1016                 // Join the thread
1017                 pthread_join( self->ahead_thread, NULL );
1018                 self->started = 0;
1019
1020                 // Destroy the frame queue mutex
1021                 pthread_mutex_destroy( &self->queue_mutex );
1022
1023                 // Destroy the condition
1024                 pthread_cond_destroy( &self->queue_cond );
1025
1026                 // Wipe the queue
1027                 while ( mlt_deque_count( self->queue ) )
1028                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1029
1030                 // Close the queue
1031                 mlt_deque_close( self->queue );
1032         }
1033 }
1034
1035 /** Stop the worker threads.
1036  *
1037  * \private \memberof mlt_consumer_s
1038  * \param self a consumer
1039  */
1040
1041 static void consumer_work_stop( mlt_consumer self )
1042 {
1043         // Make sure we're running
1044         if ( self->started )
1045         {
1046                 // Inform thread to stop
1047                 self->ahead = 0;
1048
1049                 // Broadcast to the queue condition in case it's waiting
1050                 pthread_mutex_lock( &self->queue_mutex );
1051                 pthread_cond_broadcast( &self->queue_cond );
1052                 pthread_mutex_unlock( &self->queue_mutex );
1053
1054                 // Broadcast to the put condition in case it's waiting
1055                 pthread_mutex_lock( &self->put_mutex );
1056                 pthread_cond_broadcast( &self->put_cond );
1057                 pthread_mutex_unlock( &self->put_mutex );
1058
1059                 // Broadcast to the done condition in case it's waiting
1060                 pthread_mutex_lock( &self->done_mutex );
1061                 pthread_cond_broadcast( &self->done_cond );
1062                 pthread_mutex_unlock( &self->done_mutex );
1063
1064                 // Join the threads
1065                 pthread_t *thread;
1066                 while ( ( thread = mlt_deque_pop_back( self->worker_threads ) ) )
1067                         pthread_join( *thread, NULL );
1068
1069                 // Deallocate the array of threads
1070                 if ( thread )
1071                         free( thread );
1072
1073                 // Indicate that worker threads no longer running
1074                 self->started = 0;
1075
1076                 // Destroy the mutexes
1077                 pthread_mutex_destroy( &self->queue_mutex );
1078                 pthread_mutex_destroy( &self->done_mutex );
1079
1080                 // Destroy the conditions
1081                 pthread_cond_destroy( &self->queue_cond );
1082                 pthread_cond_destroy( &self->done_cond );
1083
1084                 // Wipe the queues
1085                 while ( mlt_deque_count( self->queue ) )
1086                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1087
1088                 // Close the queues
1089                 mlt_deque_close( self->queue );
1090                 mlt_deque_close( self->worker_threads );
1091         }
1092 }
1093
1094 /** Flush the read/render thread's buffer.
1095  *
1096  * \public \memberof mlt_consumer_s
1097  * \param self a consumer
1098  */
1099
1100 void mlt_consumer_purge( mlt_consumer self )
1101 {
1102         if ( self->ahead )
1103         {
1104                 pthread_mutex_lock( &self->queue_mutex );
1105                 while ( mlt_deque_count( self->queue ) )
1106                         mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1107                 pthread_cond_broadcast( &self->queue_cond );
1108                 pthread_mutex_unlock( &self->queue_mutex );
1109         }
1110 }
1111
1112 /** Use multiple worker threads and a work queue.
1113  */
1114
1115 static mlt_frame worker_get_frame( mlt_consumer self, mlt_properties properties )
1116 {
1117         // Frame to return
1118         mlt_frame frame = NULL;
1119
1120         int size = abs( self->real_time );
1121         int buffer = mlt_properties_get_int( properties, "buffer" );
1122         // This is a heuristic to determine a suitable minimum buffer size for the number of threads.
1123         int headroom = 2 + size * size;
1124         buffer = buffer < headroom ? headroom : buffer;
1125
1126         // Start worker threads if not already started.
1127         if ( ! self->ahead )
1128         {
1129                 int prefill = mlt_properties_get_int( properties, "prefill" );
1130                 prefill = prefill > 0 && prefill < buffer ? prefill : buffer;
1131
1132                 consumer_work_start( self );
1133
1134                 // Fill the work queue.
1135                 int i = buffer;
1136                 while ( self->ahead && i-- )
1137                 {
1138                         frame = mlt_consumer_get_frame( self );
1139                         if ( frame )
1140                         {
1141                                 pthread_mutex_lock( &self->queue_mutex );
1142                                 mlt_deque_push_back( self->queue, frame );
1143                                 pthread_cond_signal( &self->queue_cond );
1144                                 pthread_mutex_unlock( &self->queue_mutex );
1145                         }
1146                 }
1147
1148                 // Wait for prefill
1149                 while ( self->ahead && first_unprocessed_frame( self ) < prefill )
1150                 {
1151                         pthread_mutex_lock( &self->done_mutex );
1152                         pthread_cond_wait( &self->done_cond, &self->done_mutex );
1153                         pthread_mutex_unlock( &self->done_mutex );
1154                 }
1155                 self->process_head = size;
1156         }
1157
1158 //      mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "size %d done count %d work count %d process_head %d\n",
1159 //              size, first_unprocessed_frame( self ), mlt_deque_count( self->queue ), self->process_head );
1160
1161         // Feed the work queue
1162         while ( self->ahead && mlt_deque_count( self->queue ) < buffer )
1163         {
1164                 frame = mlt_consumer_get_frame( self );
1165                 if ( ! frame )
1166                         return frame;
1167                 pthread_mutex_lock( &self->queue_mutex );
1168                 mlt_deque_push_back( self->queue, frame );
1169                 pthread_cond_signal( &self->queue_cond );
1170                 pthread_mutex_unlock( &self->queue_mutex );
1171         }
1172
1173         // Wait if not realtime.
1174         while( self->ahead && self->real_time < 0 &&
1175                ! mlt_properties_get_int( MLT_FRAME_PROPERTIES( MLT_FRAME( mlt_deque_peek_front( self->queue ) ) ), "rendered" ) )
1176         {
1177                 pthread_mutex_lock( &self->done_mutex );
1178                 pthread_cond_wait( &self->done_cond, &self->done_mutex );
1179                 pthread_mutex_unlock( &self->done_mutex );
1180         }
1181
1182         // Get the frame from the queue.
1183         pthread_mutex_lock( &self->queue_mutex );
1184         frame = mlt_deque_pop_front( self->queue );
1185         pthread_mutex_unlock( &self->queue_mutex );
1186
1187         // Adapt the worker process head to the runtime conditions.
1188         if ( self->real_time > 0 )
1189         {
1190                 if ( frame && mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered" ) )
1191                 {
1192                         self->consecutive_dropped = 0;
1193                         if ( self->process_head > size && self->consecutive_rendered >= self->process_head )
1194                                 self->process_head--;
1195                         else
1196                                 self->consecutive_rendered++;
1197                 }
1198                 else
1199                 {
1200                         self->consecutive_rendered = 0;
1201                         if ( self->process_head < buffer - size && self->consecutive_dropped > size )
1202                                 self->process_head++;
1203                         else
1204                                 self->consecutive_dropped++;
1205                 }
1206 //              mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "dropped %d rendered %d process_head %d\n",
1207 //                      self->consecutive_dropped, self->consecutive_rendered, self->process_head );
1208         }
1209
1210         return frame;
1211 }
1212
1213 /** Get the next frame from the producer connected to a consumer.
1214  *
1215  * Typically, one uses this instead of \p mlt_consumer_get_frame to make
1216  * the asynchronous/real-time behavior configurable at runtime.
1217  * You should close the frame returned from this when you are done with it.
1218  *
1219  * \public \memberof mlt_consumer_s
1220  * \param self a consumer
1221  * \return a frame
1222  */
1223
1224 mlt_frame mlt_consumer_rt_frame( mlt_consumer self )
1225 {
1226         // Frame to return
1227         mlt_frame frame = NULL;
1228
1229         // Get the properties
1230         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1231
1232         // Check if the user has requested real time or not
1233         if ( self->real_time > 1 || self->real_time < -1 )
1234         {
1235                 // see above
1236                 return worker_get_frame( self, properties );
1237         }
1238         else if ( self->real_time == 1 || self->real_time == -1 )
1239         {
1240                 int size = 1;
1241
1242                 // Is the read ahead running?
1243                 if ( self->ahead == 0 )
1244                 {
1245                         int buffer = mlt_properties_get_int( properties, "buffer" );
1246                         int prefill = mlt_properties_get_int( properties, "prefill" );
1247                         consumer_read_ahead_start( self );
1248                         if ( buffer > 1 )
1249                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
1250                 }
1251
1252                 // Get frame from queue
1253                 pthread_mutex_lock( &self->queue_mutex );
1254                 while( self->ahead && mlt_deque_count( self->queue ) < size )
1255                         pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
1256                 frame = mlt_deque_pop_front( self->queue );
1257                 pthread_cond_broadcast( &self->queue_cond );
1258                 pthread_mutex_unlock( &self->queue_mutex );
1259         }
1260         else // real_time == 0
1261         {
1262                 // Get the frame in non real time
1263                 frame = mlt_consumer_get_frame( self );
1264
1265                 // This isn't true, but from the consumers perspective it is
1266                 if ( frame != NULL )
1267                         mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
1268         }
1269
1270         return frame;
1271 }
1272
1273 /** Callback for the implementation to indicate a stopped condition.
1274  *
1275  * \public \memberof mlt_consumer_s
1276  * \param self a consumer
1277  */
1278
1279 void mlt_consumer_stopped( mlt_consumer self )
1280 {
1281         mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( self ), "running", 0 );
1282         mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-stopped", NULL );
1283         mlt_event_unblock( self->event_listener );
1284 }
1285
1286 /** Stop the consumer.
1287  *
1288  * \public \memberof mlt_consumer_s
1289  * \param self a consumer
1290  * \return true if there was an error
1291  */
1292
1293 int mlt_consumer_stop( mlt_consumer self )
1294 {
1295         // Get the properies
1296         mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1297
1298         // Just in case...
1299         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping put waiting\n" );
1300         pthread_mutex_lock( &self->put_mutex );
1301         self->put_active = 0;
1302         pthread_cond_broadcast( &self->put_cond );
1303         pthread_mutex_unlock( &self->put_mutex );
1304
1305         // Stop the consumer
1306         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping consumer\n" );
1307
1308         // Cancel the read ahead threads
1309         self->ahead = 0;
1310         if ( self->started )
1311         {
1312                 // Unblock the consumer calling mlt_consumer_rt_frame
1313                 pthread_mutex_lock( &self->queue_mutex );
1314                 pthread_cond_broadcast( &self->queue_cond );
1315                 pthread_mutex_unlock( &self->queue_mutex );
1316         }
1317
1318         // Invoke the child callback
1319         if ( self->stop != NULL )
1320                 self->stop( self );
1321
1322         // Check if the user has requested real time or not and stop if necessary
1323         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping read_ahead\n" );
1324         if ( abs( self->real_time ) == 1 )
1325                 consumer_read_ahead_stop( self );
1326         else if ( abs( self->real_time ) > 1 )
1327                 consumer_work_stop( self );
1328
1329         // Kill the test card
1330         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
1331
1332         // Check and run a post command
1333         if ( mlt_properties_get( properties, "post" ) )
1334                 if (system( mlt_properties_get( properties, "post" ) ) == -1 )
1335                         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "post" ) );
1336
1337         mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopped\n" );
1338
1339         return 0;
1340 }
1341
1342 /** Determine if the consumer is stopped.
1343  *
1344  * \public \memberof mlt_consumer_s
1345  * \param self a consumer
1346  * \return true if the consumer is stopped
1347  */
1348
1349 int mlt_consumer_is_stopped( mlt_consumer self )
1350 {
1351         // Check if the consumer is stopped
1352         if ( self->is_stopped != NULL )
1353                 return self->is_stopped( self );
1354
1355         return 0;
1356 }
1357
1358 /** Close and destroy the consumer.
1359  *
1360  * \public \memberof mlt_consumer_s
1361  * \param self a consumer
1362  */
1363
1364 void mlt_consumer_close( mlt_consumer self )
1365 {
1366         if ( self != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( self ) ) <= 0 )
1367         {
1368                 // Get the childs close function
1369                 void ( *consumer_close )( ) = self->close;
1370
1371                 if ( consumer_close )
1372                 {
1373                         // Just in case...
1374                         //mlt_consumer_stop( self );
1375
1376                         self->close = NULL;
1377                         consumer_close( self );
1378                 }
1379                 else
1380                 {
1381                         // Make sure it only gets called once
1382                         self->parent.close = NULL;
1383
1384                         // Destroy the push mutex and condition
1385                         pthread_mutex_destroy( &self->put_mutex );
1386                         pthread_cond_destroy( &self->put_cond );
1387
1388                         mlt_service_close( &self->parent );
1389                 }
1390         }
1391 }
1392
1393 /** Get the position of the last frame shown.
1394  *
1395  * \public \memberof mlt_consumer_s
1396  * \param consumer a consumer
1397  * \return the position
1398  */
1399
1400 mlt_position mlt_consumer_position( mlt_consumer consumer )
1401 {
1402         return consumer->position;
1403 }
1404