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1 /*
2  * mlt_consumer.c -- abstraction for all consumer services
3  * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4  * Author: Charles Yates <charles.yates@pandora.be>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 #include "config.h"
22 #include "mlt_consumer.h"
23 #include "mlt_factory.h"
24 #include "mlt_producer.h"
25 #include "mlt_frame.h"
26 #include <stdio.h>
27 #include <string.h>
28 #include <stdlib.h>
29 #include <sys/time.h>
30
31 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args );
32
33 /** Public final methods
34 */
35
36 int mlt_consumer_init( mlt_consumer this, void *child )
37 {
38         int error = 0;
39         memset( this, 0, sizeof( struct mlt_consumer_s ) );
40         this->child = child;
41         error = mlt_service_init( &this->parent, this );
42         if ( error == 0 )
43         {
44                 // Get the properties from the service
45                 mlt_properties properties = mlt_service_properties( &this->parent );
46
47                 // Get the normalisation preference
48                 char *normalisation = mlt_environment( "MLT_NORMALISATION" );
49
50                 // Deal with normalisation
51                 if ( normalisation == NULL || strcmp( normalisation, "NTSC" ) )
52                 {
53                         mlt_properties_set( properties, "normalisation", "PAL" );
54                         mlt_properties_set_double( properties, "fps", 25.0 );
55                         mlt_properties_set_int( properties, "width", 720 );
56                         mlt_properties_set_int( properties, "height", 576 );
57                         mlt_properties_set_int( properties, "progressive", 0 );
58                         mlt_properties_set_double( properties, "aspect_ratio", 128.0 / 117.0 );
59                 }
60                 else
61                 {
62                         mlt_properties_set( properties, "normalisation", "NTSC" );
63                         mlt_properties_set_double( properties, "fps", 30000.0 / 1001.0 );
64                         mlt_properties_set_int( properties, "width", 720 );
65                         mlt_properties_set_int( properties, "height", 480 );
66                         mlt_properties_set_int( properties, "progressive", 0 );
67                         mlt_properties_set_double( properties, "aspect_ratio", 72.0 / 79.0 );
68                 }
69
70                 // Default rescaler for all consumers
71                 mlt_properties_set( properties, "rescale", "bilinear" );
72
73                 // Default read ahead buffer size
74                 mlt_properties_set_int( properties, "buffer", 25 );
75
76                 // Default audio frequency and channels
77                 mlt_properties_set_int( properties, "frequency", 48000 );
78                 mlt_properties_set_int( properties, "channels", 2 );
79
80                 // Default of all consumers is real time
81                 mlt_properties_set_int( properties, "real_time", 1 );
82
83                 // Default to environment test card
84                 mlt_properties_set( properties, "test_card", mlt_environment( "MLT_TEST_CARD" ) );
85
86                 // Hmm - default all consumers to yuv422 :-/
87                 this->format = mlt_image_yuv422;
88
89                 mlt_events_register( properties, "consumer-frame-show", ( mlt_transmitter )mlt_consumer_frame_show );
90                 mlt_events_register( properties, "consumer-stopped", NULL );
91         }
92         return error;
93 }
94
95 static void mlt_consumer_frame_show( mlt_listener listener, mlt_properties owner, mlt_service this, void **args )
96 {
97         if ( listener != NULL )
98                 listener( owner, this, ( mlt_frame )args[ 0 ] );
99 }
100
101 /** Create a new consumer.
102 */
103
104 mlt_consumer mlt_consumer_new( )
105 {
106         // Create the memory for the structure
107         mlt_consumer this = malloc( sizeof( struct mlt_consumer_s ) );
108
109         // Initialise it
110         if ( this != NULL )
111                 mlt_consumer_init( this, NULL );
112
113         // Return it
114         return this;
115 }
116
117 /** Get the parent service object.
118 */
119
120 mlt_service mlt_consumer_service( mlt_consumer this )
121 {
122         return this != NULL ? &this->parent : NULL;
123 }
124
125 /** Get the consumer properties.
126 */
127
128 mlt_properties mlt_consumer_properties( mlt_consumer this )
129 {
130         return this != NULL ? mlt_service_properties( &this->parent ) : NULL;
131 }
132
133 /** Connect the consumer to the producer.
134 */
135
136 int mlt_consumer_connect( mlt_consumer this, mlt_service producer )
137 {
138         return mlt_service_connect_producer( &this->parent, producer, 0 );
139 }
140
141 /** Start the consumer.
142 */
143
144 int mlt_consumer_start( mlt_consumer this )
145 {
146         // Get the properies
147         mlt_properties properties = mlt_consumer_properties( this );
148
149         // Determine if there's a test card producer
150         char *test_card = mlt_properties_get( properties, "test_card" );
151
152         // Deal with it now.
153         if ( test_card != NULL )
154         {
155                 if ( mlt_properties_get_data( properties, "test_card_producer", NULL ) == NULL )
156                 {
157                         // Create a test card producer
158                         mlt_producer producer = mlt_factory_producer( NULL, test_card );
159
160                         // Do we have a producer
161                         if ( producer != NULL )
162                         {
163                                 // Test card should loop I guess...
164                                 mlt_properties_set( mlt_producer_properties( producer ), "eof", "loop" );
165
166                                 // Set the test card on the consumer
167                                 mlt_properties_set_data( properties, "test_card_producer", producer, 0, ( mlt_destructor )mlt_producer_close, NULL );
168                         }
169                 }
170         }
171         else
172         {
173                 // Allow the hash table to speed things up
174                 mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
175         }
176
177         // Check and run an ante command
178         if ( mlt_properties_get( properties, "ante" ) )
179                 system( mlt_properties_get( properties, "ante" ) );
180
181         // Set the real_time preference
182         this->real_time = mlt_properties_get_int( properties, "real_time" );
183
184         // Start the service
185         if ( this->start != NULL )
186                 return this->start( this );
187
188         return 0;
189 }
190
191 /** Protected method for consumer to get frames from connected service
192 */
193
194 mlt_frame mlt_consumer_get_frame( mlt_consumer this )
195 {
196         // Frame to return
197         mlt_frame frame = NULL;
198
199         // Get the service assoicated to the consumer
200         mlt_service service = mlt_consumer_service( this );
201
202         // Get the frame
203         if ( mlt_service_get_frame( service, &frame, 0 ) == 0 )
204         {
205                 // Get the consumer properties
206                 mlt_properties properties = mlt_consumer_properties( this );
207
208                 // Get the frame properties
209                 mlt_properties frame_properties = mlt_frame_properties( frame );
210
211                 // Get the test card producer
212                 mlt_producer test_card = mlt_properties_get_data( properties, "test_card_producer", NULL );
213
214                 // Attach the test frame producer to it.
215                 if ( test_card != NULL )
216                         mlt_properties_set_data( frame_properties, "test_card_producer", test_card, 0, NULL, NULL );
217
218                 // Attach the rescale property
219                 mlt_properties_set( frame_properties, "rescale.interp", mlt_properties_get( properties, "rescale" ) );
220
221                 // Aspect ratio and other jiggery pokery
222                 mlt_properties_set_double( frame_properties, "consumer_aspect_ratio", mlt_properties_get_double( properties, "aspect_ratio" ) );
223                 if ( mlt_properties_get_int( properties, "progressive" ) || mlt_properties_get_int( properties, "deinterlace" ) )
224                         mlt_properties_set_int( frame_properties, "consumer_deinterlace", 1 );
225         }
226
227         // Return the frame
228         return frame;
229 }
230
231 static inline long time_difference( struct timeval *time1 )
232 {
233         struct timeval time2;
234         time2.tv_sec = time1->tv_sec;
235         time2.tv_usec = time1->tv_usec;
236         gettimeofday( time1, NULL );
237         return time1->tv_sec * 1000000 + time1->tv_usec - time2.tv_sec * 1000000 - time2.tv_usec;
238 }
239
240 static void *consumer_read_ahead_thread( void *arg )
241 {
242         // The argument is the consumer
243         mlt_consumer this = arg;
244
245         // Get the properties of the consumer
246         mlt_properties properties = mlt_consumer_properties( this );
247
248         // Get the width and height
249         int width = mlt_properties_get_int( properties, "width" );
250         int height = mlt_properties_get_int( properties, "height" );
251
252         // See if video is turned off
253         int video_off = mlt_properties_get_int( properties, "video_off" );
254
255         // Get the audio settings
256         mlt_audio_format afmt = mlt_audio_pcm;
257         int counter = 0;
258         double fps = mlt_properties_get_double( properties, "fps" );
259         int channels = mlt_properties_get_int( properties, "channels" );
260         int frequency = mlt_properties_get_int( properties, "frequency" );
261         int samples = 0;
262         int16_t *pcm = NULL;
263
264         // See if audio is turned off
265         int audio_off = mlt_properties_get_int( properties, "audio_off" );
266
267         // Get the maximum size of the buffer
268         int buffer = mlt_properties_get_int( properties, "buffer" ) + 1;
269
270         // General frame variable
271         mlt_frame frame = NULL;
272         uint8_t *image = NULL;
273
274         // Time structures
275         struct timeval ante;
276
277         // Average time for get_frame and get_image
278         int count = 1;
279         int skipped = 0;
280         int64_t time_wait = 0;
281         int64_t time_frame = 0;
282         int64_t time_process = 0;
283         int skip_next = 0;
284
285         // Get the first frame
286         frame = mlt_consumer_get_frame( this );
287
288         // Get the image of the first frame
289         if ( !video_off )
290                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
291
292         if ( !audio_off )
293         {
294                 samples = mlt_sample_calculator( fps, frequency, counter++ );
295                 mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
296                 frame->get_audio = NULL;
297         }
298
299         mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 1 );
300
301         // Get the starting time (can ignore the times above)
302         gettimeofday( &ante, NULL );
303
304         // Continue to read ahead
305         while ( this->ahead )
306         {
307                 // Put the current frame into the queue
308                 pthread_mutex_lock( &this->mutex );
309                 while( this->ahead && mlt_deque_count( this->queue ) >= buffer )
310                         pthread_cond_wait( &this->cond, &this->mutex );
311                 mlt_deque_push_back( this->queue, frame );
312                 pthread_cond_broadcast( &this->cond );
313                 pthread_mutex_unlock( &this->mutex );
314                 time_wait += time_difference( &ante );
315
316                 // Get the next frame
317                 frame = mlt_consumer_get_frame( this );
318                 time_frame += time_difference( &ante );
319
320                 // Increment the count
321                 count ++;
322
323                 // All non normal playback frames should be shown
324                 if ( mlt_properties_get_int( mlt_frame_properties( frame ), "_speed" ) != 1 )
325                 {
326                         skipped = 0;
327                         time_frame = 0;
328                         time_process = 0;
329                         time_wait = 0;
330                         count = 1;
331                         skip_next = 0;
332                 }
333
334                 // Get the image
335                 if ( !skip_next )
336                 {
337                         // Get the image, mark as rendered and time it
338                         if ( !video_off )
339                                 mlt_frame_get_image( frame, &image, &this->format, &width, &height, 0 );
340                         mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 1 );
341                 }
342                 else
343                 {
344                         // Increment the number of sequentially skipped frames
345                         skipped ++;
346                         skip_next = 0;
347
348                         // If we've reached an unacceptable level, reset everything
349                         if ( skipped > 5 )
350                         {
351                                 skipped = 0;
352                                 time_frame = 0;
353                                 time_process = 0;
354                                 time_wait = 0;
355                                 count = 1;
356                         }
357                 }
358
359                 // Always process audio
360                 if ( !audio_off )
361                 {
362                         samples = mlt_sample_calculator( fps, frequency, counter++ );
363                         mlt_frame_get_audio( frame, &pcm, &afmt, &frequency, &channels, &samples );
364                         frame->get_audio = NULL;
365                 }
366
367                 // Increment the time take for this frame
368                 time_process += time_difference( &ante );
369
370                 // Determine if the next frame should be skipped
371                 if ( mlt_deque_count( this->queue ) <= 5 && ( ( time_wait + time_frame + time_process ) / count ) > 40000 )
372                         skip_next = 1;
373         }
374
375         // Remove the last frame
376         mlt_frame_close( frame );
377
378         return NULL;
379 }
380
381 static void consumer_read_ahead_start( mlt_consumer this )
382 {
383         pthread_attr_t thread_attributes;
384         
385         // We're running now
386         this->ahead = 1;
387
388         // Create the frame queue
389         this->queue = mlt_deque_init( );
390
391         // Create the mutex
392         pthread_mutex_init( &this->mutex, NULL );
393
394         // Create the condition
395         pthread_cond_init( &this->cond, NULL );
396
397         // Inherit the scheduling priority
398         pthread_attr_init( &thread_attributes );
399         pthread_attr_setinheritsched( &thread_attributes, PTHREAD_INHERIT_SCHED );
400         
401         // Create the read ahead 
402         pthread_create( &this->ahead_thread, &thread_attributes, consumer_read_ahead_thread, this );
403 }
404
405 static void consumer_read_ahead_stop( mlt_consumer this )
406 {
407         // Make sure we're running
408         if ( this->ahead )
409         {
410                 // Inform thread to stop
411                 this->ahead = 0;
412
413                 // Broadcast to the condition in case it's waiting
414                 pthread_mutex_lock( &this->mutex );
415                 pthread_cond_broadcast( &this->cond );
416                 pthread_mutex_unlock( &this->mutex );
417
418                 // Join the thread
419                 pthread_join( this->ahead_thread, NULL );
420
421                 // Destroy the mutex
422                 pthread_mutex_destroy( &this->mutex );
423
424                 // Destroy the condition
425                 pthread_cond_destroy( &this->cond );
426
427                 // Wipe the queue
428                 while ( mlt_deque_count( this->queue ) )
429                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
430
431                 // Close the queue
432                 mlt_deque_close( this->queue );
433         }
434 }
435
436 void mlt_consumer_purge( mlt_consumer this )
437 {
438         if ( this->ahead )
439         {
440                 pthread_mutex_lock( &this->mutex );
441                 while ( mlt_deque_count( this->queue ) )
442                         mlt_frame_close( mlt_deque_pop_back( this->queue ) );
443                 pthread_cond_broadcast( &this->cond );
444                 pthread_mutex_unlock( &this->mutex );
445         }
446 }
447
448 mlt_frame mlt_consumer_rt_frame( mlt_consumer this )
449 {
450         // Frame to return
451         mlt_frame frame = NULL;
452
453         // Get the properties
454         mlt_properties properties = mlt_consumer_properties( this );
455
456         // Check if the user has requested real time or not
457         if ( this->real_time )
458         {
459                 int size = 1;
460
461                 // Is the read ahead running?
462                 if ( this->ahead == 0 )
463                 {
464                         int buffer = mlt_properties_get_int( properties, "buffer" );
465                         int prefill = mlt_properties_get_int( properties, "prefill" );
466                         consumer_read_ahead_start( this );
467                         if ( buffer > 1 )
468                                 size = prefill > 0 && prefill < buffer ? prefill : buffer;
469                 }
470         
471                 // Get frame from queue
472                 pthread_mutex_lock( &this->mutex );
473                 while( this->ahead && mlt_deque_count( this->queue ) < size )
474                         pthread_cond_wait( &this->cond, &this->mutex );
475                 frame = mlt_deque_pop_front( this->queue );
476                 pthread_cond_broadcast( &this->cond );
477                 pthread_mutex_unlock( &this->mutex );
478         }
479         else
480         {
481                 // Get the frame in non real time
482                 frame = mlt_consumer_get_frame( this );
483
484                 // This isn't true, but from the consumers perspective it is
485                 mlt_properties_set_int( mlt_frame_properties( frame ), "rendered", 1 );
486         }
487
488         return frame;
489 }
490
491 /** Callback for the implementation to indicate a stopped condition.
492 */
493
494 void mlt_consumer_stopped( mlt_consumer this )
495 {
496         mlt_properties_set_int( mlt_consumer_properties( this ), "running", 0 );
497         mlt_events_fire( mlt_consumer_properties( this ), "consumer-stopped", NULL );
498 }
499
500 /** Stop the consumer.
501 */
502
503 int mlt_consumer_stop( mlt_consumer this )
504 {
505         // Get the properies
506         mlt_properties properties = mlt_consumer_properties( this );
507
508         // Stop the consumer
509         if ( this->stop != NULL )
510                 this->stop( this );
511
512         // Check if the user has requested real time or not and stop if necessary
513         if ( mlt_properties_get_int( properties, "real_time" ) )
514                 consumer_read_ahead_stop( this );
515
516         // Kill the test card
517         mlt_properties_set_data( properties, "test_card_producer", NULL, 0, NULL, NULL );
518
519         // Check and run a post command
520         if ( mlt_properties_get( properties, "post" ) )
521                 system( mlt_properties_get( properties, "post" ) );
522
523         return 0;
524 }
525
526 /** Determine if the consumer is stopped.
527 */
528
529 int mlt_consumer_is_stopped( mlt_consumer this )
530 {
531         // Check if the consumer is stopped
532         if ( this->is_stopped != NULL )
533                 return this->is_stopped( this );
534
535         return 0;
536 }
537
538 /** Close the consumer.
539 */
540
541 void mlt_consumer_close( mlt_consumer this )
542 {
543         if ( this != NULL && mlt_properties_dec_ref( mlt_consumer_properties( this ) ) <= 0 )
544         {
545                 // Get the childs close function
546                 void ( *consumer_close )( ) = this->close;
547
548                 // Make sure it only gets called once
549                 this->close = NULL;
550                 this->parent.close = NULL;
551
552                 // Call the childs close if available
553                 if ( consumer_close != NULL )
554                         consumer_close( this );
555                 else
556                         mlt_service_close( &this->parent );
557         }
558 }