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revert avformat pts offset change and note bug in docs
[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 #if 0
45 void *av_malloc( unsigned int size )
46 {
47 return mlt_pool_alloc( size );
48 }
49
50 void *av_realloc( void *ptr, unsigned int size )
51 {
52 return mlt_pool_realloc( ptr, size );
53 }
54
55 void av_free( void *ptr )
56 {
57 return mlt_pool_release( ptr );
58 }
59 #endif
60
61 /** Constructor for libavformat.
62 */
63
64 mlt_producer producer_avformat_init( char *file )
65 {
66 mlt_producer this = NULL;
67
68 // Check that we have a non-NULL argument
69 if ( file != NULL )
70 {
71 // Construct the producer
72 this = calloc( 1, sizeof( struct mlt_producer_s ) );
73
74 // Initialise it
75 if ( mlt_producer_init( this, NULL ) == 0 )
76 {
77 // Get the properties
78 mlt_properties properties = mlt_producer_properties( this );
79
80 // Set the resource property (required for all producers)
81 mlt_properties_set( properties, "resource", file );
82
83 // TEST: audio sync tweaking
84 mlt_properties_set_double( properties, "discrepancy", 1 );
85
86 // Register our get_frame implementation
87 this->get_frame = producer_get_frame;
88
89 // Initialise avformat if necessary
90 if ( avformat_initialised == 0 )
91 {
92 avformat_initialised = 1;
93 pthread_mutex_init( &avformat_mutex, NULL );
94 av_register_all( );
95 }
96
97 // Open the file
98 if ( producer_open( this, file ) != 0 )
99 {
100 // Clean up
101 mlt_producer_close( this );
102 this = NULL;
103 }
104 }
105 }
106
107 return this;
108 }
109
110 /** Find the default streams.
111 */
112
113 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
114 {
115 int i;
116
117 // Allow for multiple audio and video streams in the file and select first of each (if available)
118 for( i = 0; i < context->nb_streams; i++ )
119 {
120 // Get the codec context
121 AVCodecContext *codec_context = &context->streams[ i ]->codec;
122
123 // Determine the type and obtain the first index of each type
124 switch( codec_context->codec_type )
125 {
126 case CODEC_TYPE_VIDEO:
127 if ( *video_index < 0 )
128 *video_index = i;
129 break;
130 case CODEC_TYPE_AUDIO:
131 if ( *audio_index < 0 )
132 *audio_index = i;
133 break;
134 default:
135 break;
136 }
137 }
138 }
139
140 /** Producer file destructor.
141 */
142
143 static void producer_file_close( void *context )
144 {
145 if ( context != NULL )
146 {
147 // Lock the mutex now
148 pthread_mutex_lock( &avformat_mutex );
149
150 // Close the file
151 av_close_input_file( context );
152
153 // Unlock the mutex now
154 pthread_mutex_unlock( &avformat_mutex );
155 }
156 }
157
158 /** Producer file destructor.
159 */
160
161 static void producer_codec_close( void *codec )
162 {
163 if ( codec != NULL )
164 {
165 // Lock the mutex now
166 pthread_mutex_lock( &avformat_mutex );
167
168 // Close the file
169 avcodec_close( codec );
170
171 // Unlock the mutex now
172 pthread_mutex_unlock( &avformat_mutex );
173 }
174 }
175
176 /** Open the file.
177 */
178
179 static int producer_open( mlt_producer this, char *file )
180 {
181 // Return an error code (0 == no error)
182 int error = 0;
183
184 // Context for avformat
185 AVFormatContext *context = NULL;
186
187 // Get the properties
188 mlt_properties properties = mlt_producer_properties( this );
189
190 // We will treat everything with the producer fps
191 double fps = mlt_properties_get_double( properties, "fps" );
192
193 // Lock the mutex now
194 pthread_mutex_lock( &avformat_mutex );
195
196 // If "MRL", then create AVInputFormat
197 AVInputFormat *format = NULL;
198 AVFormatParameters *params = NULL;
199 char *standard = NULL;
200 char *mrl = strchr( file, ':' );
201
202 // Only if there is not a protocol specification that avformat can handle
203 if ( mrl && !url_exist( file ) )
204 {
205 // 'file' becomes format abbreviation
206 mrl[0] = 0;
207
208 // Lookup the format
209 format = av_find_input_format( file );
210
211 // Eat the format designator
212 file = ++mrl;
213
214 if ( format )
215 {
216 // Allocate params
217 params = calloc( sizeof( AVFormatParameters ), 1 );
218
219 // These are required by video4linux (defaults)
220 params->width = 640;
221 params->height = 480;
222 params->frame_rate = 25;
223 params->frame_rate_base = 1;
224 params->device = file;
225 params->channels = 2;
226 params->sample_rate = 48000;
227 }
228
229 // Parse out params
230 mrl = strchr( file, '?' );
231 while ( mrl )
232 {
233 mrl[0] = 0;
234 char *name = strdup( ++mrl );
235 char *value = strchr( name, ':' );
236 if ( value )
237 {
238 value[0] = 0;
239 value++;
240 char *t = strchr( value, '&' );
241 if ( t )
242 t[0] = 0;
243 if ( !strcmp( name, "frame_rate" ) )
244 params->frame_rate = atoi( value );
245 else if ( !strcmp( name, "frame_rate_base" ) )
246 params->frame_rate_base = atoi( value );
247 else if ( !strcmp( name, "sample_rate" ) )
248 params->sample_rate = atoi( value );
249 else if ( !strcmp( name, "channels" ) )
250 params->channels = atoi( value );
251 else if ( !strcmp( name, "width" ) )
252 params->width = atoi( value );
253 else if ( !strcmp( name, "height" ) )
254 params->height = atoi( value );
255 else if ( !strcmp( name, "standard" ) )
256 {
257 standard = strdup( value );
258 params->standard = standard;
259 }
260 }
261 free( name );
262 mrl = strchr( mrl, '&' );
263 }
264 }
265
266 // Now attempt to open the file
267 error = av_open_input_file( &context, file, format, 0, params );
268 error = error < 0;
269
270 // Cleanup AVFormatParameters
271 free( standard );
272 free( params );
273
274 // If successful, then try to get additional info
275 if ( error == 0 )
276 {
277 // Get the stream info
278 error = av_find_stream_info( context ) < 0;
279
280 // Continue if no error
281 if ( error == 0 )
282 {
283 // We will default to the first audio and video streams found
284 int audio_index = -1;
285 int video_index = -1;
286
287 // Now set properties where we can (use default unknowns if required)
288 if ( context->duration != AV_NOPTS_VALUE )
289 {
290 // This isn't going to be accurate for all formats
291 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
292 mlt_properties_set_position( properties, "out", frames - 2 );
293 mlt_properties_set_position( properties, "length", frames - 1 );
294 }
295
296 // Find default audio and video streams
297 find_default_streams( context, &audio_index, &video_index );
298
299 // Store selected audio and video indexes on properties
300 mlt_properties_set_int( properties, "audio_index", audio_index );
301 mlt_properties_set_int( properties, "video_index", video_index );
302
303 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
304 if ( audio_index != -1 && video_index != -1 )
305 {
306 // We'll use the open one as our video_context
307 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
308
309 // And open again for our audio context
310 av_open_input_file( &context, file, NULL, 0, NULL );
311 av_find_stream_info( context );
312
313 // Audio context
314 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
315 }
316 else if ( video_index != -1 )
317 {
318 // We only have a video context
319 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
320 }
321 else if ( audio_index != -1 )
322 {
323 // We only have an audio context
324 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
325 }
326 else
327 {
328 // Something has gone wrong
329 error = -1;
330 }
331 }
332 }
333
334 // Unlock the mutex now
335 pthread_mutex_unlock( &avformat_mutex );
336
337 return error;
338 }
339
340 /** Convert a frame position to a time code.
341 */
342
343 static double producer_time_of_frame( mlt_producer this, mlt_position position )
344 {
345 // Get the properties
346 mlt_properties properties = mlt_producer_properties( this );
347
348 // Obtain the fps
349 double fps = mlt_properties_get_double( properties, "fps" );
350
351 // Do the calc
352 return ( double )position / fps;
353 }
354
355 /** Get an image from a frame.
356 */
357
358 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
359 {
360 // Get the properties from the frame
361 mlt_properties frame_properties = mlt_frame_properties( frame );
362
363 // Obtain the frame number of this frame
364 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
365
366 // Get the producer
367 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
368
369 // Get the producer properties
370 mlt_properties properties = mlt_producer_properties( this );
371
372 // Fetch the video_context
373 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
374
375 // Get the video_index
376 int index = mlt_properties_get_int( properties, "video_index" );
377
378 // Obtain the expected frame numer
379 mlt_position expected = mlt_properties_get_position( properties, "video_expected" );
380
381 // Calculate the real time code
382 double real_timecode = producer_time_of_frame( this, position );
383
384 // Get the video stream
385 AVStream *stream = context->streams[ index ];
386
387 // Get codec context
388 AVCodecContext *codec_context = &stream->codec;
389
390 // Packet
391 AVPacket pkt;
392
393 // Get the conversion frame
394 AVPicture *output = mlt_properties_get_data( properties, "video_output_frame", NULL );
395
396 // Special case pause handling flag
397 int paused = 0;
398
399 // Special case ffwd handling
400 int ignore = 0;
401
402 // Current time calcs
403 double current_time = mlt_properties_get_double( properties, "current_time" );
404
405 // We may want to use the source fps if available
406 double source_fps = mlt_properties_get_double( properties, "source_fps" );
407
408 // Set the result arguments that we know here (only *buffer is now required)
409 *format = mlt_image_yuv422;
410 *width = codec_context->width;
411 *height = codec_context->height;
412
413 // Set this on the frame properties
414 mlt_properties_set_int( frame_properties, "width", *width );
415 mlt_properties_set_int( frame_properties, "height", *height );
416
417 // Lock the mutex now
418 pthread_mutex_lock( &avformat_mutex );
419
420 // Construct an AVFrame for YUV422 conversion
421 if ( output == NULL )
422 {
423 int size = avpicture_get_size( PIX_FMT_YUV422, *width, *height );
424 size += *width * 2;
425 uint8_t *buf = mlt_pool_alloc( size );
426 output = mlt_pool_alloc( sizeof( AVPicture ) );
427 //memset( output, 0, sizeof( AVPicture ) );
428 avpicture_fill( output, buf, PIX_FMT_YUV422, *width, *height );
429 mlt_properties_set_data( properties, "video_output_frame", output, 0, ( mlt_destructor )mlt_pool_release, NULL );
430 mlt_properties_set_data( properties, "video_output_buffer", buf, 0, ( mlt_destructor )mlt_pool_release, NULL );
431 }
432
433 // Seek if necessary
434 if ( position != expected )
435 {
436 if ( position + 1 == expected )
437 {
438 // We're paused - use last image
439 paused = 1;
440 }
441 else if ( position > expected && ( position - expected ) < 250 )
442 {
443 // Fast forward - seeking is inefficient for small distances - just ignore following frames
444 ignore = position - expected;
445 }
446 else
447 {
448 // Set to the real timecode
449 av_seek_frame( context, -1, real_timecode * 1000000.0 );
450
451 // Remove the cached info relating to the previous position
452 mlt_properties_set_double( properties, "current_time", real_timecode );
453 mlt_properties_set_data( properties, "current_image", NULL, 0, NULL, NULL );
454 }
455 }
456
457 // Duplicate the last image if necessary
458 if ( mlt_properties_get_data( properties, "current_image", NULL ) != NULL &&
459 ( paused || mlt_properties_get_double( properties, "current_time" ) >= real_timecode ) )
460 {
461 // Get current image and size
462 int size = 0;
463 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
464
465 // Duplicate it
466 *buffer = mlt_pool_alloc( size );
467 memcpy( *buffer, image, size );
468
469 // Set this on the frame properties
470 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
471 }
472 else
473 {
474 int ret = 0;
475 int got_picture = 0;
476 AVFrame frame;
477
478 memset( &pkt, 0, sizeof( pkt ) );
479 memset( &frame, 0, sizeof( frame ) );
480
481 while( ret >= 0 && !got_picture )
482 {
483 // Read a packet
484 ret = av_read_frame( context, &pkt );
485
486 // We only deal with video from the selected video_index
487 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
488 {
489 // Decode the image
490 ret = avcodec_decode_video( codec_context, &frame, &got_picture, pkt.data, pkt.size );
491
492 if ( got_picture )
493 {
494 if ( pkt.pts != AV_NOPTS_VALUE && pkt.pts != 0 )
495 {
496 current_time = ( double )pkt.pts / 1000000.0;
497 }
498 else
499 current_time = real_timecode;
500
501 // Handle ignore
502 if ( current_time < real_timecode )
503 {
504 ignore = 0;
505 got_picture = 0;
506 }
507 else if ( current_time >= real_timecode )
508 {
509 //current_time = real_timecode;
510 ignore = 0;
511 }
512 else if ( ignore -- )
513 {
514 got_picture = 0;
515 }
516 }
517 }
518
519 // We're finished with this packet regardless
520 av_free_packet( &pkt );
521 }
522
523 // Now handle the picture if we have one
524 if ( got_picture )
525 {
526 // Get current image and size
527 int size = 0;
528 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
529
530 if ( image == NULL || size != *width * *height * 2 )
531 {
532 size = *width * ( *height + 1 ) * 2;
533 image = mlt_pool_alloc( size );
534 mlt_properties_set_data( properties, "current_image", image, size, ( mlt_destructor )mlt_pool_release, NULL );
535 }
536
537 *buffer = mlt_pool_alloc( size );
538
539 // EXPERIMENTAL IMAGE NORMALISATIONS
540 if ( codec_context->pix_fmt == PIX_FMT_YUV420P )
541 {
542 register int i, j;
543 register int half = *width >> 1;
544 register uint8_t *Y = ( ( AVPicture * )&frame )->data[ 0 ];
545 register uint8_t *U = ( ( AVPicture * )&frame )->data[ 1 ];
546 register uint8_t *V = ( ( AVPicture * )&frame )->data[ 2 ];
547 register uint8_t *d = *buffer;
548 register uint8_t *y, *u, *v;
549
550 i = *height >> 1;
551 while ( i -- )
552 {
553 y = Y;
554 u = U;
555 v = V;
556 j = half;
557 while ( j -- )
558 {
559 *d ++ = *y ++;
560 *d ++ = *u ++;
561 *d ++ = *y ++;
562 *d ++ = *v ++;
563 }
564
565 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
566 y = Y;
567 u = U;
568 v = V;
569 j = half;
570 while ( j -- )
571 {
572 *d ++ = *y ++;
573 *d ++ = *u ++;
574 *d ++ = *y ++;
575 *d ++ = *v ++;
576 }
577
578 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
579 U += ( ( AVPicture * )&frame )->linesize[ 1 ];
580 V += ( ( AVPicture * )&frame )->linesize[ 2 ];
581 }
582 }
583 else
584 {
585 img_convert( output, PIX_FMT_YUV422, (AVPicture *)&frame, codec_context->pix_fmt, *width, *height );
586 memcpy( *buffer, output->data[ 0 ], size );
587 }
588
589 memcpy( image, *buffer, size );
590 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
591
592 if ( current_time == 0 && source_fps != 0 )
593 {
594 double fps = mlt_properties_get_double( properties, "fps" );
595 current_time = ceil( source_fps * ( double )position / fps ) * ( 1 / source_fps );
596 mlt_properties_set_double( properties, "current_time", current_time );
597 }
598 else
599 {
600 mlt_properties_set_double( properties, "current_time", current_time );
601 }
602 }
603 }
604
605 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
606 mlt_properties_set_position( properties, "video_expected", position + 1 );
607
608 // Unlock the mutex now
609 pthread_mutex_unlock( &avformat_mutex );
610
611 return 0;
612 }
613
614 /** Set up video handling.
615 */
616
617 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
618 {
619 // Get the properties
620 mlt_properties properties = mlt_producer_properties( this );
621
622 // Fetch the video_context
623 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
624
625 // Get the video_index
626 int index = mlt_properties_get_int( properties, "video_index" );
627
628 // Get the frame properties
629 mlt_properties frame_properties = mlt_frame_properties( frame );
630
631 // Lock the mutex now
632 pthread_mutex_lock( &avformat_mutex );
633
634 if ( context != NULL && index != -1 )
635 {
636 // Get the video stream
637 AVStream *stream = context->streams[ index ];
638
639 // Get codec context
640 AVCodecContext *codec_context = &stream->codec;
641
642 // Get the codec
643 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
644
645 // Initialise the codec if necessary
646 if ( codec == NULL )
647 {
648 // Find the codec
649 codec = avcodec_find_decoder( codec_context->codec_id );
650
651 // If we don't have a codec and we can't initialise it, we can't do much more...
652 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
653 {
654 // Now store the codec with its destructor
655 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
656 }
657 else
658 {
659 // Remember that we can't use this later
660 mlt_properties_set_int( properties, "video_index", -1 );
661 }
662 }
663
664 // No codec, no show...
665 if ( codec != NULL )
666 {
667 double aspect_ratio = 1;
668 double source_fps = 0;
669
670 // Set aspect ratio
671 if ( codec_context->sample_aspect_ratio.num > 0 )
672 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
673
674 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
675 //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
676
677 // Determine the fps
678 source_fps = ( double )codec_context->frame_rate / ( codec_context->frame_rate_base == 0 ? 1 : codec_context->frame_rate_base );
679
680 // We'll use fps if it's available
681 if ( source_fps > 0 && source_fps < 30 )
682 mlt_properties_set_double( properties, "source_fps", source_fps );
683
684 // Set the width and height
685 mlt_properties_set_int( frame_properties, "width", codec_context->width );
686 mlt_properties_set_int( frame_properties, "height", codec_context->height );
687
688 mlt_frame_push_get_image( frame, producer_get_image );
689 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
690 }
691 else
692 {
693 mlt_properties_set_int( frame_properties, "test_image", 1 );
694 }
695 }
696 else
697 {
698 mlt_properties_set_int( frame_properties, "test_image", 1 );
699 }
700
701 // Unlock the mutex now
702 pthread_mutex_unlock( &avformat_mutex );
703 }
704
705 /** Get the audio from a frame.
706 */
707
708 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
709 {
710 // Get the properties from the frame
711 mlt_properties frame_properties = mlt_frame_properties( frame );
712
713 // Obtain the frame number of this frame
714 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
715
716 // Get the producer
717 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
718
719 // Get the producer properties
720 mlt_properties properties = mlt_producer_properties( this );
721
722 // Fetch the audio_context
723 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
724
725 // Get the audio_index
726 int index = mlt_properties_get_int( properties, "audio_index" );
727
728 // Obtain the expected frame numer
729 mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
730
731 // Obtain the resample context if it exists (not always needed)
732 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
733
734 // Obtain the audio buffer
735 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
736
737 // Get amount of audio used
738 int audio_used = mlt_properties_get_int( properties, "audio_used" );
739
740 // Calculate the real time code
741 double real_timecode = producer_time_of_frame( this, position );
742
743 // Get the audio stream
744 AVStream *stream = context->streams[ index ];
745
746 // Get codec context
747 AVCodecContext *codec_context = &stream->codec;
748
749 // Packet
750 AVPacket pkt;
751
752 // Number of frames to ignore (for ffwd)
753 int ignore = 0;
754
755 // Flag for paused (silence)
756 int paused = 0;
757 int locked = 0;
758
759 // Lock the mutex now
760 pthread_mutex_lock( &avformat_mutex );
761
762 // Check for resample and create if necessary
763 if ( resample == NULL )
764 {
765 // Create the resampler
766 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
767
768 // And store it on properties
769 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
770 }
771
772 // Check for audio buffer and create if necessary
773 if ( audio_buffer == NULL )
774 {
775 // Allocate the audio buffer
776 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
777
778 // And store it on properties for reuse
779 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
780 }
781
782 // Seek if necessary
783 if ( position != expected )
784 {
785 if ( position + 1 == expected )
786 {
787 // We're paused - silence required
788 paused = 1;
789 }
790 else if ( position > expected && ( position - expected ) < 250 )
791 {
792 // Fast forward - seeking is inefficient for small distances - just ignore following frames
793 ignore = position - expected;
794 }
795 else
796 {
797 // Set to the real timecode
798 av_seek_frame( context, -1, real_timecode * 1000000.0 );
799
800 // Clear the usage in the audio buffer
801 audio_used = 0;
802
803 locked = 1;
804 }
805 }
806
807 // Get the audio if required
808 if ( !paused )
809 {
810 int ret = 0;
811 int got_audio = 0;
812 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
813
814 memset( &pkt, 0, sizeof( pkt ) );
815
816 while( ret >= 0 && !got_audio )
817 {
818 // Check if the buffer already contains the samples required
819 if ( audio_used >= *samples && ignore == 0 )
820 {
821 got_audio = 1;
822 break;
823 }
824
825 // Read a packet
826 ret = av_read_frame( context, &pkt );
827
828 int len = pkt.size;
829 uint8_t *ptr = pkt.data;
830 int data_size;
831
832 // We only deal with video from the selected video_index
833 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
834 {
835 // Decode the audio
836 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
837
838 if ( ret < 0 )
839 {
840 ret = 0;
841 break;
842 }
843
844 len -= ret;
845 ptr += ret;
846
847 if ( data_size > 0 )
848 {
849 int size_out = audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
850
851 audio_used += size_out;
852
853 // Handle ignore
854 while ( ignore && audio_used > *samples )
855 {
856 ignore --;
857 audio_used -= *samples;
858 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
859 }
860 }
861
862 // If we're behind, ignore this packet
863 float current_pts = (float)pkt.pts / 1000000.0;
864 double discrepancy = mlt_properties_get_double( properties, "discrepancy" );
865 if ( current_pts != 0 && real_timecode != 0 )
866 {
867 if ( discrepancy != 1 )
868 discrepancy = ( discrepancy + ( real_timecode / current_pts ) ) / 2;
869 else
870 discrepancy = real_timecode / current_pts;
871 if ( discrepancy > 0.9 && discrepancy < 1.1 )
872 discrepancy = 1.0;
873 else
874 discrepancy = floor( discrepancy + 0.5 );
875
876 if ( discrepancy == 0 )
877 discrepancy = 1.0;
878
879 mlt_properties_set_double( properties, "discrepancy", discrepancy );
880 }
881
882 if ( !ignore && discrepancy * current_pts <= ( real_timecode - 0.02 ) )
883 ignore = 1;
884 }
885
886 // We're finished with this packet regardless
887 av_free_packet( &pkt );
888 }
889
890 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
891 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
892
893 // Now handle the audio if we have enough
894 if ( audio_used >= *samples )
895 {
896 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
897 audio_used -= *samples;
898 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
899 }
900 else
901 {
902 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
903 }
904
905 // Store the number of audio samples still available
906 mlt_properties_set_int( properties, "audio_used", audio_used );
907
908 // Release the temporary audio
909 mlt_pool_release( temp );
910 }
911 else
912 {
913 // Get silence and don't touch the context
914 frame->get_audio = NULL;
915 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
916 }
917
918 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
919 mlt_properties_set_position( properties, "audio_expected", position + 1 );
920
921 // Unlock the mutex now
922 pthread_mutex_unlock( &avformat_mutex );
923
924 return 0;
925 }
926
927 /** Set up audio handling.
928 */
929
930 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
931 {
932 // Get the properties
933 mlt_properties properties = mlt_producer_properties( this );
934
935 // Fetch the audio_context
936 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
937
938 // Get the audio_index
939 int index = mlt_properties_get_int( properties, "audio_index" );
940
941 // Lock the mutex now
942 pthread_mutex_lock( &avformat_mutex );
943
944 // Deal with audio context
945 if ( context != NULL && index != -1 )
946 {
947 // Get the frame properties
948 mlt_properties frame_properties = mlt_frame_properties( frame );
949
950 // Get the audio stream
951 AVStream *stream = context->streams[ index ];
952
953 // Get codec context
954 AVCodecContext *codec_context = &stream->codec;
955
956 // Get the codec
957 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
958
959 // Initialise the codec if necessary
960 if ( codec == NULL )
961 {
962 // Find the codec
963 codec = avcodec_find_decoder( codec_context->codec_id );
964
965 // If we don't have a codec and we can't initialise it, we can't do much more...
966 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
967 {
968 // Now store the codec with its destructor
969 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
970
971 }
972 else
973 {
974 // Remember that we can't use this later
975 mlt_properties_set_int( properties, "audio_index", -1 );
976 }
977 }
978
979 // No codec, no show...
980 if ( codec != NULL )
981 {
982 frame->get_audio = producer_get_audio;
983 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
984 }
985 }
986
987 // Unlock the mutex now
988 pthread_mutex_unlock( &avformat_mutex );
989 }
990
991 /** Our get frame implementation.
992 */
993
994 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
995 {
996 // Create an empty frame
997 *frame = mlt_frame_init( );
998
999 // Update timecode on the frame we're creating
1000 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1001
1002 // Set the position of this producer
1003 mlt_properties_set_position( mlt_frame_properties( *frame ), "avformat_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
1004
1005 // Set up the video
1006 producer_set_up_video( this, *frame );
1007
1008 // Set up the audio
1009 producer_set_up_audio( this, *frame );
1010
1011 // Set the aspect_ratio
1012 mlt_properties_set_double( mlt_frame_properties( *frame ), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
1013
1014 // Calculate the next timecode
1015 mlt_producer_prepare_next( this );
1016
1017 return 0;
1018 }
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