3 * \brief abstraction for all consumer services
6 * Copyright (C) 2003-2010 Ushodaya Enterprises Limited
7 * \author Charles Yates <charles.yates@pandora.be>
8 * \author Dan Dennedy <dan@dennedy.org>
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.
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.
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
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"
37 /** Define this if you want an automatic deinterlace (if necessary) when the
38 * consumer's producer is not running at normal speed.
40 #undef DEINTERLACE_ON_NOT_NORMAL_SPEED
42 /** This is not the ideal place for this, but it is needed by VDPAU as well.
44 pthread_mutex_t mlt_sdl_mutex = PTHREAD_MUTEX_INITIALIZER;
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 );
52 /** Initialize a consumer service.
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
62 int mlt_consumer_init( mlt_consumer self, void *child, mlt_profile profile )
65 memset( self, 0, sizeof( struct mlt_consumer_s ) );
67 error = mlt_service_init( &self->parent, self );
70 // Get the properties from the service
71 mlt_properties properties = MLT_SERVICE_PROPERTIES( &self->parent );
73 // Apply profile to properties
74 if ( profile == NULL )
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 );
82 apply_profile_properties( self, profile, properties );
84 // Default rescaler for all consumers
85 mlt_properties_set( properties, "rescale", "bilinear" );
87 // Default read ahead buffer size
88 mlt_properties_set_int( properties, "buffer", 25 );
90 // Default audio frequency and channels
91 mlt_properties_set_int( properties, "frequency", 48000 );
92 mlt_properties_set_int( properties, "channels", 2 );
94 // Default of all consumers is real time
95 mlt_properties_set_int( properties, "real_time", 1 );
97 // Default to environment test card
98 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
100 // Hmm - default all consumers to yuv422 :-/
101 self->format = mlt_image_yuv422;
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 );
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 );
112 // Create the push mutex and condition
113 pthread_mutex_init( &self->put_mutex, NULL );
114 pthread_cond_init( &self->put_cond, NULL );
120 /** Convert the profile into properties on the consumer.
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)
128 static void apply_profile_properties( mlt_consumer self, mlt_profile profile, mlt_properties properties )
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 );
147 /** The property-changed event listener
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
155 static void mlt_consumer_property_changed( mlt_properties owner, mlt_consumer self, char *name )
157 if ( !strcmp( name, "profile" ) )
160 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
162 // Get the current profile
163 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
165 // Load the new profile
166 mlt_profile new_profile = mlt_profile_init( mlt_properties_get( properties, name ) );
171 if ( profile != NULL )
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 );
180 profile = new_profile;
183 // Apply to properties
184 apply_profile_properties( self, profile, properties );
187 else if ( !strcmp( name, "frame_rate_num" ) )
189 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
190 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
193 profile->frame_rate_num = mlt_properties_get_int( properties, "frame_rate_num" );
194 mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
197 else if ( !strcmp( name, "frame_rate_den" ) )
199 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
200 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
203 profile->frame_rate_den = mlt_properties_get_int( properties, "frame_rate_den" );
204 mlt_properties_set_double( properties, "fps", mlt_profile_fps( profile ) );
207 else if ( !strcmp( name, "width" ) )
209 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
210 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
212 profile->width = mlt_properties_get_int( properties, "width" );
214 else if ( !strcmp( name, "height" ) )
216 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
217 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
219 profile->height = mlt_properties_get_int( properties, "height" );
221 else if ( !strcmp( name, "progressive" ) )
223 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
224 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
226 profile->progressive = mlt_properties_get_int( properties, "progressive" );
228 else if ( !strcmp( name, "sample_aspect_num" ) )
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" );
234 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );
236 else if ( !strcmp( name, "sample_aspect_den" ) )
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" );
242 mlt_properties_set_double( properties, "aspect_ratio", mlt_profile_sar( profile ) );
244 else if ( !strcmp( name, "display_aspect_num" ) )
246 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
247 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
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 ) );
254 else if ( !strcmp( name, "display_aspect_den" ) )
256 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
257 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
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 ) );
264 else if ( !strcmp( name, "colorspace" ) )
266 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
267 mlt_profile profile = mlt_service_profile( MLT_CONSUMER_SERVICE( self ) );
269 profile->colorspace = mlt_properties_get_int( properties, "colorspace" );
273 /** The transmitter for the consumer-frame-show event
275 * Invokes the listener.
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
284 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
286 if ( listener != NULL )
287 listener( owner, self, ( mlt_frame )args[ 0 ] );
290 /** The transmitter for the consumer-frame-render event
292 * Invokes the listener.
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
301 static void mlt_consumer_frame_render( mlt_listener listener, mlt_properties owner, mlt_service self, void **args )
303 if ( listener != NULL )
304 listener( owner, self, ( mlt_frame )args[ 0 ] );
307 /** A listener on the consumer-frame-show event
309 * Saves the position of the frame shown.
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
317 static void on_consumer_frame_show( mlt_properties owner, mlt_consumer consumer, mlt_frame frame )
320 consumer->position = mlt_frame_get_position( frame );
323 /** Create a new consumer.
325 * \public \memberof mlt_consumer_s
326 * \param profile a profile (optional, but recommended)
327 * \return a new consumer
330 mlt_consumer mlt_consumer_new( mlt_profile profile )
332 // Create the memory for the structure
333 mlt_consumer self = malloc( sizeof( struct mlt_consumer_s ) );
337 mlt_consumer_init( self, NULL, profile );
343 /** Get the parent service object.
345 * \public \memberof mlt_consumer_s
346 * \param self a consumer
347 * \return the parent service class
348 * \see MLT_CONSUMER_SERVICE
351 mlt_service mlt_consumer_service( mlt_consumer self )
353 return self != NULL ? &self->parent : NULL;
356 /** Get the consumer properties.
358 * \public \memberof mlt_consumer_s
359 * \param self a consumer
360 * \return the consumer's properties list
361 * \see MLT_CONSUMER_PROPERTIES
364 mlt_properties mlt_consumer_properties( mlt_consumer self )
366 return self != NULL ? MLT_SERVICE_PROPERTIES( &self->parent ) : NULL;
369 /** Connect the consumer to the producer.
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
380 int mlt_consumer_connect( mlt_consumer self, mlt_service producer )
382 return mlt_service_connect_producer( &self->parent, producer, 0 );
385 /** Start the consumer.
387 * \public \memberof mlt_consumer_s
388 * \param self a consumer
389 * \return true if there was an error
392 int mlt_consumer_start( mlt_consumer self )
394 // Stop listening to the property-changed event
395 mlt_event_block( self->event_listener );
398 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
400 // Determine if there's a test card producer
401 char *test_card = mlt_properties_get( properties, "test_card" );
403 // Just to make sure nothing is hanging around...
405 self->put_active = 1;
408 if ( test_card != NULL )
410 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
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 );
416 // Do we have a producer
417 if ( producer != NULL )
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 );
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 );
431 // Allow the hash table to speed things up
432 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
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 );
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" ) );
445 // Set the real_time preference
446 self->real_time = mlt_properties_get_int( properties, "real_time" );
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 );
453 if ( self->start != NULL )
454 return self->start( self );
459 /** An alternative method to feed frames into the consumer.
461 * Only valid if the consumer itself is not connected.
463 * \public \memberof mlt_consumer_s
464 * \param self a consumer
465 * \param frame a frame
466 * \return true (ignore self for now)
469 int mlt_consumer_put_frame( mlt_consumer self, mlt_frame frame )
473 // Get the service assoicated to the consumer
474 mlt_service service = MLT_CONSUMER_SERVICE( self );
476 if ( mlt_service_producer( service ) == NULL )
480 pthread_mutex_lock( &self->put_mutex );
481 while ( self->put_active && self->put != NULL )
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 );
488 if ( self->put_active && self->put == NULL )
491 mlt_frame_close( frame );
492 pthread_cond_broadcast( &self->put_cond );
493 pthread_mutex_unlock( &self->put_mutex );
497 mlt_frame_close( frame );
503 /** Protected method for consumer to get frames from connected service
505 * \public \memberof mlt_consumer_s
506 * \param self a consumer
510 mlt_frame mlt_consumer_get_frame( mlt_consumer self )
513 mlt_frame frame = NULL;
515 // Get the service assoicated to the consumer
516 mlt_service service = MLT_CONSUMER_SERVICE( self );
518 // Get the consumer properties
519 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
522 if ( mlt_service_producer( service ) == NULL && mlt_properties_get_int( properties, "put_mode" ) )
526 pthread_mutex_lock( &self->put_mutex );
527 while ( self->put_active && self->put == NULL )
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 );
536 pthread_cond_broadcast( &self->put_cond );
537 pthread_mutex_unlock( &self->put_mutex );
539 mlt_service_apply_filters( service, frame, 0 );
541 else if ( mlt_service_producer( service ) != NULL )
543 mlt_service_get_frame( service, &frame, 0 );
547 frame = mlt_frame_init( service );
552 // Get the frame properties
553 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
555 // Get the test card producer
556 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
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 );
562 // Attach the rescale property
563 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
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" ) );
575 /** Compute the time difference between now and a time value.
577 * \private \memberof mlt_consumer_s
578 * \param time1 a time value to be compared against now
579 * \return the difference in microseconds
582 static inline long time_difference( struct timeval *time1 )
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;
591 /** The thread procedure for asynchronously pulling frames through the service
592 * network connected to a consumer.
594 * \private \memberof mlt_consumer_s
595 * \param arg a consumer
598 static void *consumer_read_ahead_thread( void *arg )
600 // The argument is the consumer
601 mlt_consumer self = arg;
603 // Get the properties of the consumer
604 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
606 // Get the width and height
607 int width = mlt_properties_get_int( properties, "width" );
608 int height = mlt_properties_get_int( properties, "height" );
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" );
615 // Get the audio settings
616 mlt_audio_format afmt = mlt_audio_s16;
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" );
624 // See if audio is turned off
625 int audio_off = mlt_properties_get_int( properties, "audio_off" );
627 // Get the maximum size of the buffer
628 int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
630 // General frame variable
631 mlt_frame frame = NULL;
632 uint8_t *image = NULL;
637 // Average time for get_frame and get_image
640 int64_t time_wait = 0;
641 int64_t time_frame = 0;
642 int64_t time_process = 0;
644 mlt_position pos = 0;
645 mlt_position start_pos = 0;
646 mlt_position last_pos = 0;
648 if ( preview_off && preview_format != 0 )
649 self->format = preview_format;
651 // Get the first frame
652 frame = mlt_consumer_get_frame( self );
656 // Get the image of the first frame
659 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
660 mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
665 samples = mlt_sample_calculator( fps, frequency, counter++ );
666 mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
670 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
671 last_pos = start_pos = pos = mlt_frame_get_position( frame );
674 // Get the starting time (can ignore the times above)
675 gettimeofday( &ante, NULL );
677 // Continue to read ahead
678 while ( self->ahead )
680 // Fetch width/height again
681 width = mlt_properties_get_int( properties, "width" );
682 height = mlt_properties_get_int( properties, "height" );
684 // Put the current frame into the queue
685 pthread_mutex_lock( &self->queue_mutex );
686 while( self->ahead && mlt_deque_count( self->queue ) >= buffer )
687 pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
688 mlt_deque_push_back( self->queue, frame );
689 pthread_cond_broadcast( &self->queue_cond );
690 pthread_mutex_unlock( &self->queue_mutex );
692 time_wait += time_difference( &ante );
694 // Get the next frame
695 frame = mlt_consumer_get_frame( self );
696 time_frame += time_difference( &ante );
698 // If there's no frame, we're probably stopped...
701 pos = mlt_frame_get_position( frame );
703 // Increment the count
706 // All non normal playback frames should be shown
707 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
709 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
710 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
722 if ( !skip_next || self->real_time == -1 )
724 // Get the image, mark as rendered and time it
727 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
728 mlt_frame_get_image( frame, &image, &self->format, &width, &height, 0 );
730 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
735 // Increment the number of sequentially skipped frames
739 // If we've reached an unacceptable level, reset everything
740 if ( skipped > fps * 2 )
750 // Always process audio
753 samples = mlt_sample_calculator( fps, frequency, counter++ );
754 mlt_frame_get_audio( frame, &audio, &afmt, &frequency, &channels, &samples );
757 // Increment the time take for self frame
758 time_process += time_difference( &ante );
760 // Determine if the next frame should be skipped
761 if ( pos != last_pos + 1 )
764 if ( pos - start_pos <= buffer/5 )
766 // Do not skip the first 20% of buffer at start, resuming, or seeking
773 if ( mlt_deque_count( self->queue ) <= buffer/5 )
775 int frame_duration = mlt_properties_get_int( properties, "frame_duration" );
776 if ( ( ( time_wait + time_frame + time_process ) / count ) > frame_duration )
781 // Remove the last frame
782 mlt_frame_close( frame );
787 /** Locate the first unprocessed frame in the queue.
789 * When playing with realtime behavior, we do not use the true head, but
790 * rather an adjusted process_head. The process_head is adjusted based on
791 * the rate of frame-dropping or recovery from frame-dropping. The idea is
792 * that as the level of frame-dropping increases to move the process_head
793 * closer to the tail because the frames are not completing processing prior
794 * to their playout! Then, as frames are not dropped the process_head moves
795 * back closer to the head of the queue so that worker threads can work
796 * ahead of the playout point (queue head).
798 * \private \memberof mlt_consumer_s
799 * \param self a consumer
800 * \return an index into the queue
803 static inline int first_unprocessed_frame( mlt_consumer self )
805 int index = self->real_time <= 0 ? 0 : self->process_head;
806 while ( index < mlt_deque_count( self->queue ) && MLT_FRAME( mlt_deque_peek( self->queue, index ) )->is_processing )
811 /** The worker thread procedure for parallel processing frames.
813 * \private \memberof mlt_consumer_s
814 * \param arg a consumer
817 static void *consumer_worker_thread( void *arg )
819 // The argument is the consumer
820 mlt_consumer self = arg;
822 // Get the properties of the consumer
823 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
825 // Get the width and height
826 int width = mlt_properties_get_int( properties, "width" );
827 int height = mlt_properties_get_int( properties, "height" );
828 mlt_image_format format = self->format;
830 // See if video is turned off
831 int video_off = mlt_properties_get_int( properties, "video_off" );
832 int preview_off = mlt_properties_get_int( properties, "preview_off" );
833 int preview_format = mlt_properties_get_int( properties, "preview_format" );
835 // General frame variable
836 mlt_frame frame = NULL;
837 uint8_t *image = NULL;
839 if ( preview_off && preview_format != 0 )
840 format = preview_format;
842 // Continue to read ahead
843 while ( self->ahead )
845 // Get the next unprocessed frame from the work queue
846 pthread_mutex_lock( &self->queue_mutex );
847 int index = first_unprocessed_frame( self );
848 while ( self->ahead && index >= mlt_deque_count( self->queue ) )
850 mlt_log_debug( MLT_CONSUMER_SERVICE(self), "waiting in worker index = %d queue count = %d\n",
851 index, mlt_deque_count( self->queue ) );
852 pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
853 index = first_unprocessed_frame( self );
856 // Mark the frame for processing
857 frame = mlt_deque_peek( self->queue, index );
860 mlt_log_debug( MLT_CONSUMER_SERVICE(self), "worker processing index = %d frame %d queue count = %d\n",
861 index, mlt_frame_get_position(frame), mlt_deque_count( self->queue ) );
862 frame->is_processing = 1;
863 mlt_properties_inc_ref( MLT_FRAME_PROPERTIES( frame ) );
865 pthread_mutex_unlock( &self->queue_mutex );
867 // If there's no frame, we're probably stopped...
871 #ifdef DEINTERLACE_ON_NOT_NORMAL_SPEED
872 // All non normal playback frames should be shown
873 if ( mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "_speed" ) != 1 )
874 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "consumer_deinterlace", 1 );
880 // Fetch width/height again
881 width = mlt_properties_get_int( properties, "width" );
882 height = mlt_properties_get_int( properties, "height" );
883 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-frame-render", frame, NULL );
884 mlt_frame_get_image( frame, &image, &format, &width, &height, 0 );
886 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
887 mlt_frame_close( frame );
889 // Tell a waiting thread (non-realtime main consumer thread) that we are done.
890 pthread_mutex_lock( &self->done_mutex );
891 pthread_cond_broadcast( &self->done_cond );
892 pthread_mutex_unlock( &self->done_mutex );
898 /** Start the read/render thread.
900 * \private \memberof mlt_consumer_s
901 * \param self a consumer
904 static void consumer_read_ahead_start( mlt_consumer self )
909 // Create the frame queue
910 self->queue = mlt_deque_init( );
912 // Create the queue mutex
913 pthread_mutex_init( &self->queue_mutex, NULL );
915 // Create the condition
916 pthread_cond_init( &self->queue_cond, NULL );
918 // Create the read ahead
919 if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
921 struct sched_param priority;
922 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
923 pthread_attr_t thread_attributes;
924 pthread_attr_init( &thread_attributes );
925 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
926 pthread_attr_setschedparam( &thread_attributes, &priority );
927 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
928 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
929 if ( pthread_create( &self->ahead_thread, &thread_attributes, consumer_read_ahead_thread, self ) < 0 )
930 pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
931 pthread_attr_destroy( &thread_attributes );
935 pthread_create( &self->ahead_thread, NULL, consumer_read_ahead_thread, self );
940 /** Start the worker threads.
942 * \private \memberof mlt_consumer_s
943 * \param self a consumer
946 static void consumer_work_start( mlt_consumer self )
948 int n = abs( self->real_time );
949 pthread_t *thread = calloc( 1, sizeof( pthread_t ) * n );
954 // These keep track of the accelleration of frame dropping or recovery.
955 self->consecutive_dropped = 0;
956 self->consecutive_rendered = 0;
958 // This is the position in the queue from which to look for a frame to process.
959 // If we always start from the head, then we may likely not complete processing
960 // before the frame is played out.
961 self->process_head = 0;
964 self->queue = mlt_deque_init();
965 self->worker_threads = mlt_deque_init();
967 // Create the mutexes
968 pthread_mutex_init( &self->queue_mutex, NULL );
969 pthread_mutex_init( &self->done_mutex, NULL );
971 // Create the conditions
972 pthread_cond_init( &self->queue_cond, NULL );
973 pthread_cond_init( &self->done_cond, NULL );
975 // Create the read ahead
976 if ( mlt_properties_get( MLT_CONSUMER_PROPERTIES( self ), "priority" ) )
979 struct sched_param priority;
980 pthread_attr_t thread_attributes;
982 priority.sched_priority = mlt_properties_get_int( MLT_CONSUMER_PROPERTIES( self ), "priority" );
983 pthread_attr_init( &thread_attributes );
984 pthread_attr_setschedpolicy( &thread_attributes, SCHED_OTHER );
985 pthread_attr_setschedparam( &thread_attributes, &priority );
986 pthread_attr_setinheritsched( &thread_attributes, PTHREAD_EXPLICIT_SCHED );
987 pthread_attr_setscope( &thread_attributes, PTHREAD_SCOPE_SYSTEM );
991 if ( pthread_create( thread, &thread_attributes, consumer_worker_thread, self ) < 0 )
992 if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
993 mlt_deque_push_back( self->worker_threads, thread );
996 pthread_attr_destroy( &thread_attributes );
1003 if ( pthread_create( thread, NULL, consumer_worker_thread, self ) == 0 )
1004 mlt_deque_push_back( self->worker_threads, thread );
1011 /** Stop the read/render thread.
1013 * \private \memberof mlt_consumer_s
1014 * \param self a consumer
1017 static void consumer_read_ahead_stop( mlt_consumer self )
1019 // Make sure we're running
1020 if ( self->started )
1022 // Inform thread to stop
1025 // Broadcast to the condition in case it's waiting
1026 pthread_mutex_lock( &self->queue_mutex );
1027 pthread_cond_broadcast( &self->queue_cond );
1028 pthread_mutex_unlock( &self->queue_mutex );
1030 // Broadcast to the put condition in case it's waiting
1031 pthread_mutex_lock( &self->put_mutex );
1032 pthread_cond_broadcast( &self->put_cond );
1033 pthread_mutex_unlock( &self->put_mutex );
1036 pthread_join( self->ahead_thread, NULL );
1039 // Destroy the frame queue mutex
1040 pthread_mutex_destroy( &self->queue_mutex );
1042 // Destroy the condition
1043 pthread_cond_destroy( &self->queue_cond );
1046 while ( mlt_deque_count( self->queue ) )
1047 mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1050 mlt_deque_close( self->queue );
1054 /** Stop the worker threads.
1056 * \private \memberof mlt_consumer_s
1057 * \param self a consumer
1060 static void consumer_work_stop( mlt_consumer self )
1062 // Make sure we're running
1063 if ( self->started )
1065 // Inform thread to stop
1068 // Broadcast to the queue condition in case it's waiting
1069 pthread_mutex_lock( &self->queue_mutex );
1070 pthread_cond_broadcast( &self->queue_cond );
1071 pthread_mutex_unlock( &self->queue_mutex );
1073 // Broadcast to the put condition in case it's waiting
1074 pthread_mutex_lock( &self->put_mutex );
1075 pthread_cond_broadcast( &self->put_cond );
1076 pthread_mutex_unlock( &self->put_mutex );
1078 // Broadcast to the done condition in case it's waiting
1079 pthread_mutex_lock( &self->done_mutex );
1080 pthread_cond_broadcast( &self->done_cond );
1081 pthread_mutex_unlock( &self->done_mutex );
1085 while ( ( thread = mlt_deque_pop_back( self->worker_threads ) ) )
1086 pthread_join( *thread, NULL );
1088 // Deallocate the array of threads
1092 // Indicate that worker threads no longer running
1095 // Destroy the mutexes
1096 pthread_mutex_destroy( &self->queue_mutex );
1097 pthread_mutex_destroy( &self->done_mutex );
1099 // Destroy the conditions
1100 pthread_cond_destroy( &self->queue_cond );
1101 pthread_cond_destroy( &self->done_cond );
1104 while ( mlt_deque_count( self->queue ) )
1105 mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1108 mlt_deque_close( self->queue );
1109 mlt_deque_close( self->worker_threads );
1113 /** Flush the read/render thread's buffer.
1115 * \public \memberof mlt_consumer_s
1116 * \param self a consumer
1119 void mlt_consumer_purge( mlt_consumer self )
1123 pthread_mutex_lock( &self->queue_mutex );
1124 while ( mlt_deque_count( self->queue ) )
1125 mlt_frame_close( mlt_deque_pop_back( self->queue ) );
1126 pthread_cond_broadcast( &self->queue_cond );
1127 pthread_mutex_unlock( &self->queue_mutex );
1131 /** Use multiple worker threads and a work queue.
1134 static mlt_frame worker_get_frame( mlt_consumer self, mlt_properties properties )
1137 mlt_frame frame = NULL;
1139 int size = abs( self->real_time );
1140 int buffer = mlt_properties_get_int( properties, "buffer" );
1141 // This is a heuristic to determine a suitable minimum buffer size for the number of threads.
1142 int headroom = 2 + size * size;
1143 buffer = buffer < headroom ? headroom : buffer;
1145 // Start worker threads if not already started.
1146 if ( ! self->ahead )
1148 int prefill = mlt_properties_get_int( properties, "prefill" );
1149 prefill = prefill > 0 && prefill < buffer ? prefill : buffer;
1151 consumer_work_start( self );
1153 // Fill the work queue.
1155 while ( self->ahead && i-- )
1157 frame = mlt_consumer_get_frame( self );
1160 pthread_mutex_lock( &self->queue_mutex );
1161 mlt_deque_push_back( self->queue, frame );
1162 pthread_cond_signal( &self->queue_cond );
1163 pthread_mutex_unlock( &self->queue_mutex );
1168 while ( self->ahead && first_unprocessed_frame( self ) < prefill )
1170 pthread_mutex_lock( &self->done_mutex );
1171 pthread_cond_wait( &self->done_cond, &self->done_mutex );
1172 pthread_mutex_unlock( &self->done_mutex );
1174 self->process_head = size;
1177 // mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "size %d done count %d work count %d process_head %d\n",
1178 // size, first_unprocessed_frame( self ), mlt_deque_count( self->queue ), self->process_head );
1180 // Feed the work queue
1181 while ( self->ahead && mlt_deque_count( self->queue ) < buffer )
1183 frame = mlt_consumer_get_frame( self );
1186 pthread_mutex_lock( &self->queue_mutex );
1187 mlt_deque_push_back( self->queue, frame );
1188 pthread_cond_signal( &self->queue_cond );
1189 pthread_mutex_unlock( &self->queue_mutex );
1192 // Wait if not realtime.
1193 while( self->ahead && self->real_time < 0 &&
1194 ! mlt_properties_get_int( MLT_FRAME_PROPERTIES( MLT_FRAME( mlt_deque_peek_front( self->queue ) ) ), "rendered" ) )
1196 pthread_mutex_lock( &self->done_mutex );
1197 pthread_cond_wait( &self->done_cond, &self->done_mutex );
1198 pthread_mutex_unlock( &self->done_mutex );
1201 // Get the frame from the queue.
1202 pthread_mutex_lock( &self->queue_mutex );
1203 frame = mlt_deque_pop_front( self->queue );
1204 pthread_mutex_unlock( &self->queue_mutex );
1206 // Adapt the worker process head to the runtime conditions.
1207 if ( self->real_time > 0 )
1209 if ( frame && mlt_properties_get_int( MLT_FRAME_PROPERTIES( frame ), "rendered" ) )
1211 self->consecutive_dropped = 0;
1212 if ( self->process_head > size && self->consecutive_rendered >= self->process_head )
1213 self->process_head--;
1215 self->consecutive_rendered++;
1219 self->consecutive_rendered = 0;
1220 if ( self->process_head < buffer - size && self->consecutive_dropped > size )
1221 self->process_head++;
1223 self->consecutive_dropped++;
1225 // mlt_log_verbose( MLT_CONSUMER_SERVICE(self), "dropped %d rendered %d process_head %d\n",
1226 // self->consecutive_dropped, self->consecutive_rendered, self->process_head );
1232 /** Get the next frame from the producer connected to a consumer.
1234 * Typically, one uses this instead of \p mlt_consumer_get_frame to make
1235 * the asynchronous/real-time behavior configurable at runtime.
1236 * You should close the frame returned from this when you are done with it.
1238 * \public \memberof mlt_consumer_s
1239 * \param self a consumer
1243 mlt_frame mlt_consumer_rt_frame( mlt_consumer self )
1246 mlt_frame frame = NULL;
1248 // Get the properties
1249 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1251 // Check if the user has requested real time or not
1252 if ( self->real_time > 1 || self->real_time < -1 )
1255 return worker_get_frame( self, properties );
1257 else if ( self->real_time == 1 || self->real_time == -1 )
1261 // Is the read ahead running?
1262 if ( self->ahead == 0 )
1264 int buffer = mlt_properties_get_int( properties, "buffer" );
1265 int prefill = mlt_properties_get_int( properties, "prefill" );
1266 consumer_read_ahead_start( self );
1268 size = prefill > 0 && prefill < buffer ? prefill : buffer;
1271 // Get frame from queue
1272 pthread_mutex_lock( &self->queue_mutex );
1273 while( self->ahead && mlt_deque_count( self->queue ) < size )
1274 pthread_cond_wait( &self->queue_cond, &self->queue_mutex );
1275 frame = mlt_deque_pop_front( self->queue );
1276 pthread_cond_broadcast( &self->queue_cond );
1277 pthread_mutex_unlock( &self->queue_mutex );
1279 else // real_time == 0
1281 // Get the frame in non real time
1282 frame = mlt_consumer_get_frame( self );
1284 // This isn't true, but from the consumers perspective it is
1285 if ( frame != NULL )
1286 mlt_properties_set_int( MLT_FRAME_PROPERTIES( frame ), "rendered", 1 );
1292 /** Callback for the implementation to indicate a stopped condition.
1294 * \public \memberof mlt_consumer_s
1295 * \param self a consumer
1298 void mlt_consumer_stopped( mlt_consumer self )
1300 mlt_properties_set_int( MLT_CONSUMER_PROPERTIES( self ), "running", 0 );
1301 mlt_events_fire( MLT_CONSUMER_PROPERTIES( self ), "consumer-stopped", NULL );
1302 mlt_event_unblock( self->event_listener );
1305 /** Stop the consumer.
1307 * \public \memberof mlt_consumer_s
1308 * \param self a consumer
1309 * \return true if there was an error
1312 int mlt_consumer_stop( mlt_consumer self )
1314 // Get the properies
1315 mlt_properties properties = MLT_CONSUMER_PROPERTIES( self );
1318 mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping put waiting\n" );
1319 pthread_mutex_lock( &self->put_mutex );
1320 self->put_active = 0;
1321 pthread_cond_broadcast( &self->put_cond );
1322 pthread_mutex_unlock( &self->put_mutex );
1324 // Stop the consumer
1325 mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping consumer\n" );
1327 // Cancel the read ahead threads
1329 if ( self->started )
1331 // Unblock the consumer calling mlt_consumer_rt_frame
1332 pthread_mutex_lock( &self->queue_mutex );
1333 pthread_cond_broadcast( &self->queue_cond );
1334 pthread_mutex_unlock( &self->queue_mutex );
1337 // Invoke the child callback
1338 if ( self->stop != NULL )
1341 // Check if the user has requested real time or not and stop if necessary
1342 mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopping read_ahead\n" );
1343 if ( abs( self->real_time ) == 1 )
1344 consumer_read_ahead_stop( self );
1345 else if ( abs( self->real_time ) > 1 )
1346 consumer_work_stop( self );
1348 // Kill the test card
1349 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
1351 // Check and run a post command
1352 if ( mlt_properties_get( properties, "post" ) )
1353 if (system( mlt_properties_get( properties, "post" ) ) == -1 )
1354 mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_ERROR, "system(%s) failed!\n", mlt_properties_get( properties, "post" ) );
1356 mlt_log( MLT_CONSUMER_SERVICE( self ), MLT_LOG_DEBUG, "stopped\n" );
1361 /** Determine if the consumer is stopped.
1363 * \public \memberof mlt_consumer_s
1364 * \param self a consumer
1365 * \return true if the consumer is stopped
1368 int mlt_consumer_is_stopped( mlt_consumer self )
1370 // Check if the consumer is stopped
1371 if ( self->is_stopped != NULL )
1372 return self->is_stopped( self );
1377 /** Close and destroy the consumer.
1379 * \public \memberof mlt_consumer_s
1380 * \param self a consumer
1383 void mlt_consumer_close( mlt_consumer self )
1385 if ( self != NULL && mlt_properties_dec_ref( MLT_CONSUMER_PROPERTIES( self ) ) <= 0 )
1387 // Get the childs close function
1388 void ( *consumer_close )( ) = self->close;
1390 if ( consumer_close )
1393 //mlt_consumer_stop( self );
1396 consumer_close( self );
1400 // Make sure it only gets called once
1401 self->parent.close = NULL;
1403 // Destroy the push mutex and condition
1404 pthread_mutex_destroy( &self->put_mutex );
1405 pthread_cond_destroy( &self->put_cond );
1407 mlt_service_close( &self->parent );
1412 /** Get the position of the last frame shown.
1414 * \public \memberof mlt_consumer_s
1415 * \param consumer a consumer
1416 * \return the position
1419 mlt_position mlt_consumer_position( mlt_consumer consumer )
1421 return consumer->position;