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