avformat whoops, pooling claridication and removal of dv leak
[melted] / src / modules / avformat / producer_avformat.c
1 /*
2 * producer_avformat.c -- avformat producer
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 // Local header files
22 #include "producer_avformat.h"
23
24 // MLT Header files
25 #include <framework/mlt_frame.h>
26
27 // ffmpeg Header files
28 #include <ffmpeg/avformat.h>
29
30 // System header files
31 #include <stdlib.h>
32 #include <string.h>
33 #include <pthread.h>
34 #include <math.h>
35
36 // Forward references.
37 static int producer_open( mlt_producer this, char *file );
38 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
39
40 // A static flag used to determine if avformat has been initialised
41 static int avformat_initialised = 0;
42 static pthread_mutex_t avformat_mutex;
43
44 /** Constructor for libavformat.
45 */
46
47 mlt_producer producer_avformat_init( char *file )
48 {
49 mlt_producer this = NULL;
50
51 // Check that we have a non-NULL argument
52 if ( file != NULL )
53 {
54 // Construct the producer
55 this = calloc( 1, sizeof( struct mlt_producer_s ) );
56
57 // Initialise it
58 if ( mlt_producer_init( this, NULL ) == 0 )
59 {
60 // Get the properties
61 mlt_properties properties = mlt_producer_properties( this );
62
63 // Set the resource property (required for all producers)
64 mlt_properties_set( properties, "resource", file );
65
66 // TEST: audio sync tweaking
67 mlt_properties_set_double( properties, "discrepancy", 1 );
68
69 // Register our get_frame implementation
70 this->get_frame = producer_get_frame;
71
72 // Initialise avformat if necessary
73 if ( avformat_initialised == 0 )
74 {
75 pthread_mutex_init( &avformat_mutex, NULL );
76 avformat_initialised = 1;
77 av_register_all( );
78 }
79
80 // Open the file
81 if ( producer_open( this, file ) != 0 )
82 {
83 // Clean up
84 mlt_producer_close( this );
85 this = NULL;
86 }
87 }
88 }
89
90 return this;
91 }
92
93 /** Find the default streams.
94 */
95
96 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
97 {
98 int i;
99
100 // Allow for multiple audio and video streams in the file and select first of each (if available)
101 for( i = 0; i < context->nb_streams; i++ )
102 {
103 // Get the codec context
104 AVCodecContext *codec_context = &context->streams[ i ]->codec;
105
106 // Determine the type and obtain the first index of each type
107 switch( codec_context->codec_type )
108 {
109 case CODEC_TYPE_VIDEO:
110 if ( *video_index < 0 )
111 *video_index = i;
112 break;
113 case CODEC_TYPE_AUDIO:
114 if ( *audio_index < 0 )
115 *audio_index = i;
116 break;
117 default:
118 break;
119 }
120 }
121 }
122
123 /** Producer file destructor.
124 */
125
126 static void producer_file_close( void *context )
127 {
128 if ( context != NULL )
129 {
130 // Lock the mutex now
131 pthread_mutex_lock( &avformat_mutex );
132
133 // Close the file
134 av_close_input_file( context );
135
136 // Unlock the mutex now
137 pthread_mutex_unlock( &avformat_mutex );
138 }
139 }
140
141 /** Producer file destructor.
142 */
143
144 static void producer_codec_close( void *codec )
145 {
146 if ( codec != NULL )
147 {
148 // Lock the mutex now
149 pthread_mutex_lock( &avformat_mutex );
150
151 // Close the file
152 avcodec_close( codec );
153
154 // Unlock the mutex now
155 pthread_mutex_unlock( &avformat_mutex );
156 }
157 }
158
159 /** Open the file.
160 */
161
162 static int producer_open( mlt_producer this, char *file )
163 {
164 // Return an error code (0 == no error)
165 int error = 0;
166
167 // Context for avformat
168 AVFormatContext *context = NULL;
169
170 // Get the properties
171 mlt_properties properties = mlt_producer_properties( this );
172
173 // We will treat everything with the producer fps
174 double fps = mlt_properties_get_double( properties, "fps" );
175
176 // Lock the mutex now
177 pthread_mutex_lock( &avformat_mutex );
178
179 // Now attempt to open the file
180 error = av_open_input_file( &context, file, NULL, 0, NULL );
181 error = error < 0;
182
183 // If successful, then try to get additional info
184 if ( error == 0 )
185 {
186 // Get the stream info
187 error = av_find_stream_info( context ) < 0;
188
189 // Continue if no error
190 if ( error == 0 )
191 {
192 // We will default to the first audio and video streams found
193 int audio_index = -1;
194 int video_index = -1;
195
196 // Now set properties where we can (use default unknowns if required)
197 if ( context->duration != AV_NOPTS_VALUE )
198 {
199 // This isn't going to be accurate for all formats
200 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
201 mlt_properties_set_position( properties, "out", frames - 2 );
202 mlt_properties_set_position( properties, "length", frames - 1 );
203 }
204
205 // Find default audio and video streams
206 find_default_streams( context, &audio_index, &video_index );
207
208 // Store selected audio and video indexes on properties
209 mlt_properties_set_int( properties, "audio_index", audio_index );
210 mlt_properties_set_int( properties, "video_index", video_index );
211
212 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
213 if ( audio_index != -1 && video_index != -1 )
214 {
215 // We'll use the open one as our video_context
216 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
217
218 // And open again for our audio context
219 av_open_input_file( &context, file, NULL, 0, NULL );
220 av_find_stream_info( context );
221
222 // Audio context
223 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
224 }
225 else if ( video_index != -1 )
226 {
227 // We only have a video context
228 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
229 }
230 else if ( audio_index != -1 )
231 {
232 // We only have an audio context
233 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
234 }
235 else
236 {
237 // Something has gone wrong
238 error = -1;
239 }
240 }
241 }
242
243 // Unlock the mutex now
244 pthread_mutex_unlock( &avformat_mutex );
245
246 return error;
247 }
248
249 /** Convert a frame position to a time code.
250 */
251
252 static double producer_time_of_frame( mlt_producer this, mlt_position position )
253 {
254 // Get the properties
255 mlt_properties properties = mlt_producer_properties( this );
256
257 // Obtain the fps
258 double fps = mlt_properties_get_double( properties, "fps" );
259
260 // Do the calc
261 return ( double )position / fps;
262 }
263
264 /** Get an image from a frame.
265 */
266
267 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
268 {
269 // Get the properties from the frame
270 mlt_properties frame_properties = mlt_frame_properties( frame );
271
272 // Obtain the frame number of this frame
273 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
274
275 // Get the producer
276 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
277
278 // Get the producer properties
279 mlt_properties properties = mlt_producer_properties( this );
280
281 // Fetch the video_context
282 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
283
284 // Get the video_index
285 int index = mlt_properties_get_int( properties, "video_index" );
286
287 // Obtain the expected frame numer
288 mlt_position expected = mlt_properties_get_position( properties, "video_expected" );
289
290 // Calculate the real time code
291 double real_timecode = producer_time_of_frame( this, position );
292
293 // Get the video stream
294 AVStream *stream = context->streams[ index ];
295
296 // Get codec context
297 AVCodecContext *codec_context = &stream->codec;
298
299 // Packet
300 AVPacket pkt;
301
302 // Get the conversion frame
303 AVPicture *output = mlt_properties_get_data( properties, "video_output_frame", NULL );
304
305 // Special case pause handling flag
306 int paused = 0;
307
308 // Special case ffwd handling
309 int ignore = 0;
310
311 // Current time calcs
312 double current_time = 0;
313
314 // We may want to use the source fps if available
315 double source_fps = mlt_properties_get_double( properties, "source_fps" );
316
317 // Set the result arguments that we know here (only *buffer is now required)
318 *format = mlt_image_yuv422;
319 *width = codec_context->width;
320 *height = codec_context->height;
321
322 // Set this on the frame properties
323 mlt_properties_set_int( frame_properties, "width", *width );
324 mlt_properties_set_int( frame_properties, "height", *height );
325
326 // Lock the mutex now
327 pthread_mutex_lock( &avformat_mutex );
328
329 // Construct an AVFrame for YUV422 conversion
330 if ( output == NULL )
331 {
332 int size = avpicture_get_size( PIX_FMT_YUV422, *width, *height );
333 size += *width * 2;
334 uint8_t *buf = mlt_pool_alloc( size );
335 output = mlt_pool_alloc( sizeof( AVPicture ) );
336 //memset( output, 0, sizeof( AVPicture ) );
337 avpicture_fill( output, buf, PIX_FMT_YUV422, *width, *height );
338 mlt_properties_set_data( properties, "video_output_frame", output, 0, ( mlt_destructor )mlt_pool_release, NULL );
339 mlt_properties_set_data( properties, "video_output_buffer", buf, 0, ( mlt_destructor )mlt_pool_release, NULL );
340 }
341
342 // Seek if necessary
343 if ( position != expected )
344 {
345 if ( position + 1 == expected )
346 {
347 // We're paused - use last image
348 paused = 1;
349 }
350 else if ( position > expected && ( position - expected ) < 250 )
351 {
352 // Fast forward - seeking is inefficient for small distances - just ignore following frames
353 ignore = position - expected;
354 }
355 else
356 {
357 // Set to the real timecode
358 av_seek_frame( context, -1, real_timecode * 1000000.0 );
359
360 // Remove the cached info relating to the previous position
361 mlt_properties_set_double( properties, "current_time", 0 );
362 mlt_properties_set_data( properties, "current_image", NULL, 0, NULL, NULL );
363 }
364 }
365
366 // Duplicate the last image if necessary
367 if ( mlt_properties_get_data( properties, "current_image", NULL ) != NULL &&
368 ( paused || mlt_properties_get_double( properties, "current_time" ) >= real_timecode ) )
369 {
370 // Get current image and size
371 int size = 0;
372 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
373
374 // Duplicate it
375 *buffer = mlt_pool_alloc( size );
376 memcpy( *buffer, image, size );
377
378 // Set this on the frame properties
379 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
380 }
381 else
382 {
383 int ret = 0;
384 int got_picture = 0;
385 AVFrame frame;
386
387 memset( &pkt, 0, sizeof( pkt ) );
388 memset( &frame, 0, sizeof( frame ) );
389
390 while( ret >= 0 && !got_picture )
391 {
392 // Read a packet
393 ret = av_read_frame( context, &pkt );
394
395 // We only deal with video from the selected video_index
396 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
397 {
398 current_time = ( double )pkt.pts / 1000000.0;
399
400 // Decode the image
401 ret = avcodec_decode_video( codec_context, &frame, &got_picture, pkt.data, pkt.size );
402
403 if ( got_picture )
404 {
405 // Handle ignore
406 if ( current_time < real_timecode )
407 {
408 ignore = 0;
409 got_picture = 0;
410 }
411 else if ( current_time >= real_timecode )
412 {
413 ignore = 0;
414 }
415 else if ( got_picture && ignore -- )
416 {
417 got_picture = 0;
418 }
419 }
420 }
421
422 // We're finished with this packet regardless
423 av_free_packet( &pkt );
424 }
425
426 // Now handle the picture if we have one
427 if ( got_picture )
428 {
429 // Get current image and size
430 int size = 0;
431 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
432
433 if ( image == NULL || size != *width * *height * 2 )
434 {
435 size = *width * ( *height + 1 ) * 2;
436 image = mlt_pool_alloc( size );
437 mlt_properties_set_data( properties, "current_image", image, size, ( mlt_destructor )mlt_pool_release, NULL );
438 }
439
440 *buffer = mlt_pool_alloc( size );
441
442 // EXPERIMENTAL IMAGE NORMALISATIONS
443 if ( codec_context->pix_fmt == PIX_FMT_YUV420P )
444 {
445 register int i, j;
446 register int half = *width >> 1;
447 uint8_t *Y = ( ( AVPicture * )&frame )->data[ 0 ];
448 uint8_t *U = ( ( AVPicture * )&frame )->data[ 1 ];
449 uint8_t *V = ( ( AVPicture * )&frame )->data[ 2 ];
450 register uint8_t *d = *buffer;
451 register uint8_t *y, *u, *v;
452
453 i = *height >> 1;
454 while ( i -- )
455 {
456 y = Y;
457 u = U;
458 v = V;
459 j = half;
460 while ( j -- )
461 {
462 *d ++ = *y ++;
463 *d ++ = *u ++;
464 *d ++ = *y ++;
465 *d ++ = *v ++;
466 }
467
468 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
469 y = Y;
470 u = U;
471 v = V;
472 j = half;
473 while ( j -- )
474 {
475 *d ++ = *y ++;
476 *d ++ = *u ++;
477 *d ++ = *y ++;
478 *d ++ = *v ++;
479 }
480
481 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
482 U += ( ( AVPicture * )&frame )->linesize[ 1 ];
483 V += ( ( AVPicture * )&frame )->linesize[ 2 ];
484 }
485 }
486 else
487 {
488 img_convert( output, PIX_FMT_YUV422, (AVPicture *)&frame, codec_context->pix_fmt, *width, *height );
489 memcpy( *buffer, output->data[ 0 ], size );
490 }
491
492 memcpy( image, *buffer, size );
493 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
494
495 if ( current_time == 0 && source_fps != 0 )
496 {
497 double fps = mlt_properties_get_double( properties, "fps" );
498 current_time = ceil( source_fps * ( double )position / fps ) * ( 1 / source_fps );
499 mlt_properties_set_double( properties, "current_time", current_time );
500 }
501 else
502 {
503 mlt_properties_set_double( properties, "current_time", current_time );
504 }
505 }
506 }
507
508 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
509 mlt_properties_set_position( properties, "video_expected", position + 1 );
510
511 // Unlock the mutex now
512 pthread_mutex_unlock( &avformat_mutex );
513
514 return 0;
515 }
516
517 /** Set up video handling.
518 */
519
520 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
521 {
522 // Get the properties
523 mlt_properties properties = mlt_producer_properties( this );
524
525 // Fetch the video_context
526 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
527
528 // Get the video_index
529 int index = mlt_properties_get_int( properties, "video_index" );
530
531 // Get the frame properties
532 mlt_properties frame_properties = mlt_frame_properties( frame );
533
534 // Lock the mutex now
535 pthread_mutex_lock( &avformat_mutex );
536
537 if ( context != NULL && index != -1 )
538 {
539 // Get the video stream
540 AVStream *stream = context->streams[ index ];
541
542 // Get codec context
543 AVCodecContext *codec_context = &stream->codec;
544
545 // Get the codec
546 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
547
548 // Initialise the codec if necessary
549 if ( codec == NULL )
550 {
551 // Find the codec
552 codec = avcodec_find_decoder( codec_context->codec_id );
553
554 // If we don't have a codec and we can't initialise it, we can't do much more...
555 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
556 {
557 double aspect_ratio = 0;
558 double source_fps = 0;
559
560 // Set aspect ratio
561 if ( codec_context->sample_aspect_ratio.num == 0)
562 aspect_ratio = 0;
563 else
564 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio ) * codec_context->width / codec_context->height;
565
566 if (aspect_ratio <= 0.0)
567 aspect_ratio = ( double )codec_context->width / ( double )codec_context->height;
568
569 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
570 fprintf( stderr, "AVFORMAT: sample aspect %f\n", aspect_ratio );
571
572 // Determine the fps
573 source_fps = ( double )codec_context->frame_rate / codec_context->frame_rate_base;
574
575 // We'll use fps if it's available
576 if ( source_fps > 0 && source_fps < 30 )
577 mlt_properties_set_double( properties, "source_fps", source_fps );
578
579 // Now store the codec with its destructor
580 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
581
582 // Set to the real timecode
583 av_seek_frame( context, -1, 0 );
584 }
585 else
586 {
587 // Remember that we can't use this later
588 mlt_properties_set_int( properties, "video_index", -1 );
589 }
590 }
591
592 // No codec, no show...
593 if ( codec != NULL )
594 {
595 mlt_frame_push_get_image( frame, producer_get_image );
596 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
597 }
598 else
599 {
600 mlt_properties_set_int( frame_properties, "test_image", 1 );
601 }
602 }
603 else
604 {
605 mlt_properties_set_int( frame_properties, "test_image", 1 );
606 }
607
608 // Unlock the mutex now
609 pthread_mutex_unlock( &avformat_mutex );
610 }
611
612 /** Get the audio from a frame.
613 */
614
615 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
616 {
617 // Get the properties from the frame
618 mlt_properties frame_properties = mlt_frame_properties( frame );
619
620 // Obtain the frame number of this frame
621 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
622
623 // Get the producer
624 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
625
626 // Get the producer properties
627 mlt_properties properties = mlt_producer_properties( this );
628
629 // Fetch the audio_context
630 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
631
632 // Get the audio_index
633 int index = mlt_properties_get_int( properties, "audio_index" );
634
635 // Obtain the expected frame numer
636 mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
637
638 // Obtain the resample context if it exists (not always needed)
639 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
640
641 // Obtain the audio buffer
642 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
643
644 // Get amount of audio used
645 int audio_used = mlt_properties_get_int( properties, "audio_used" );
646
647 // Calculate the real time code
648 double real_timecode = producer_time_of_frame( this, position );
649
650 // Get the audio stream
651 AVStream *stream = context->streams[ index ];
652
653 // Get codec context
654 AVCodecContext *codec_context = &stream->codec;
655
656 // Packet
657 AVPacket pkt;
658
659 // Number of frames to ignore (for ffwd)
660 int ignore = 0;
661
662 // Flag for paused (silence)
663 int paused = 0;
664 int locked = 0;
665
666 // Lock the mutex now
667 pthread_mutex_lock( &avformat_mutex );
668
669 // Check for resample and create if necessary
670 if ( resample == NULL )
671 {
672 // Create the resampler
673 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
674
675 // And store it on properties
676 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
677 }
678
679 // Check for audio buffer and create if necessary
680 if ( audio_buffer == NULL )
681 {
682 // Allocate the audio buffer
683 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
684
685 // And store it on properties for reuse
686 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
687 }
688
689 // Seek if necessary
690 if ( position != expected )
691 {
692 if ( position + 1 == expected )
693 {
694 // We're paused - silence required
695 paused = 1;
696 }
697 else if ( position > expected && ( position - expected ) < 250 )
698 {
699 // Fast forward - seeking is inefficient for small distances - just ignore following frames
700 ignore = position - expected;
701 }
702 else
703 {
704 // Set to the real timecode
705 av_seek_frame( context, -1, real_timecode * 1000000.0 );
706
707 // Clear the usage in the audio buffer
708 audio_used = 0;
709
710 locked = 1;
711 }
712 }
713
714 // Get the audio if required
715 if ( !paused )
716 {
717 int ret = 0;
718 int got_audio = 0;
719 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
720
721 memset( &pkt, 0, sizeof( pkt ) );
722
723 while( ret >= 0 && !got_audio )
724 {
725 // Check if the buffer already contains the samples required
726 if ( audio_used >= *samples && ignore == 0 )
727 {
728 got_audio = 1;
729 break;
730 }
731
732 // Read a packet
733 ret = av_read_frame( context, &pkt );
734
735 int len = pkt.size;
736 uint8_t *ptr = pkt.data;
737 int data_size;
738
739 // We only deal with video from the selected video_index
740 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
741 {
742 // Decode the audio
743 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
744
745 if ( ret < 0 )
746 {
747 ret = 0;
748 break;
749 }
750
751 len -= ret;
752 ptr += ret;
753
754 if ( data_size > 0 )
755 {
756 int size_out = audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
757
758 audio_used += size_out;
759
760 // Handle ignore
761 while ( ignore && audio_used > *samples )
762 {
763 ignore --;
764 audio_used -= *samples;
765 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
766 }
767 }
768
769 // If we're behind, ignore this packet
770 float current_pts = (float)pkt.pts / 1000000.0;
771 double discrepancy = mlt_properties_get_double( properties, "discrepancy" );
772 if ( current_pts != 0 && real_timecode != 0 )
773 {
774 if ( discrepancy != 1 )
775 discrepancy = ( discrepancy + ( real_timecode / current_pts ) ) / 2;
776 else
777 discrepancy = real_timecode / current_pts;
778 if ( discrepancy > 0.9 && discrepancy < 1.1 )
779 discrepancy = 1.0;
780 else
781 discrepancy = floor( discrepancy + 0.5 );
782
783 if ( discrepancy == 0 )
784 discrepancy = 1.0;
785
786 mlt_properties_set_double( properties, "discrepancy", discrepancy );
787 }
788
789 if ( discrepancy * current_pts <= ( real_timecode - 0.02 ) )
790 ignore = 1;
791 }
792
793 // We're finished with this packet regardless
794 av_free_packet( &pkt );
795 }
796
797 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
798 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
799
800 // Now handle the audio if we have enough
801 if ( audio_used >= *samples )
802 {
803 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
804 audio_used -= *samples;
805 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
806 }
807 else
808 {
809 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
810 }
811
812 // Store the number of audio samples still available
813 mlt_properties_set_int( properties, "audio_used", audio_used );
814
815 // Release the temporary audio
816 mlt_pool_release( temp );
817 }
818 else
819 {
820 // Get silence and don't touch the context
821 frame->get_audio = NULL;
822 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
823 }
824
825 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
826 mlt_properties_set_position( properties, "audio_expected", position + 1 );
827
828 // Unlock the mutex now
829 pthread_mutex_unlock( &avformat_mutex );
830
831 return 0;
832 }
833
834 /** Set up audio handling.
835 */
836
837 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
838 {
839 // Get the properties
840 mlt_properties properties = mlt_producer_properties( this );
841
842 // Fetch the audio_context
843 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
844
845 // Get the audio_index
846 int index = mlt_properties_get_int( properties, "audio_index" );
847
848 // Lock the mutex now
849 pthread_mutex_lock( &avformat_mutex );
850
851 // Deal with audio context
852 if ( context != NULL && index != -1 )
853 {
854 // Get the frame properties
855 mlt_properties frame_properties = mlt_frame_properties( frame );
856
857 // Get the audio stream
858 AVStream *stream = context->streams[ index ];
859
860 // Get codec context
861 AVCodecContext *codec_context = &stream->codec;
862
863 // Get the codec
864 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
865
866 // Initialise the codec if necessary
867 if ( codec == NULL )
868 {
869 // Find the codec
870 codec = avcodec_find_decoder( codec_context->codec_id );
871
872 // If we don't have a codec and we can't initialise it, we can't do much more...
873 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
874 {
875 // Now store the codec with its destructor
876 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
877
878 }
879 else
880 {
881 // Remember that we can't use this later
882 mlt_properties_set_int( properties, "audio_index", -1 );
883 }
884 }
885
886 // No codec, no show...
887 if ( codec != NULL )
888 {
889 frame->get_audio = producer_get_audio;
890 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
891 }
892 }
893
894 // Unlock the mutex now
895 pthread_mutex_unlock( &avformat_mutex );
896 }
897
898 /** Our get frame implementation.
899 */
900
901 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
902 {
903 // Create an empty frame
904 *frame = mlt_frame_init( );
905
906 // Update timecode on the frame we're creating
907 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
908
909 // Set the position of this producer
910 mlt_properties_set_position( mlt_frame_properties( *frame ), "avformat_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
911
912 // Set up the video
913 producer_set_up_video( this, *frame );
914
915 // Set up the audio
916 producer_set_up_audio( this, *frame );
917
918 // Set the aspect_ratio
919 mlt_properties_set_double( mlt_frame_properties( *frame ), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
920
921 // Calculate the next timecode
922 mlt_producer_prepare_next( this );
923
924 return 0;
925 }