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producer_avformat.c: bugfix building on some older versions.
[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 * Much code borrowed from ffmpeg.c: Copyright (c) 2000-2003 Fabrice Bellard
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 // MLT Header files
23 #include <framework/mlt_producer.h>
24 #include <framework/mlt_frame.h>
25 #include <framework/mlt_profile.h>
26
27 // ffmpeg Header files
28 #include <avformat.h>
29 #include <opt.h>
30 #ifdef SWSCALE
31 # include <swscale.h>
32 #endif
33 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
34 # include "audioconvert.h"
35 #endif
36
37 // System header files
38 #include <stdlib.h>
39 #include <string.h>
40 #include <pthread.h>
41 #include <math.h>
42
43 #if LIBAVUTIL_VERSION_INT < (50<<16)
44 #define PIX_FMT_YUYV422 PIX_FMT_YUV422
45 #endif
46
47 void avformat_lock( );
48 void avformat_unlock( );
49
50 // Forward references.
51 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
52 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
53
54 /** Constructor for libavformat.
55 */
56
57 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
58 {
59 int error = 0;
60
61 // Report information about available demuxers and codecs as YAML Tiny
62 if ( file && strstr( file, "f-list" ) )
63 {
64 fprintf( stderr, "---\nformats:\n" );
65 AVInputFormat *format = NULL;
66 while ( ( format = av_iformat_next( format ) ) )
67 fprintf( stderr, " - %s\n", format->name );
68 fprintf( stderr, "...\n" );
69 error = 1;
70 }
71 if ( file && strstr( file, "acodec-list" ) )
72 {
73 fprintf( stderr, "---\naudio_codecs:\n" );
74 AVCodec *codec = NULL;
75 while ( ( codec = av_codec_next( codec ) ) )
76 if ( codec->decode && codec->type == CODEC_TYPE_AUDIO )
77 fprintf( stderr, " - %s\n", codec->name );
78 fprintf( stderr, "...\n" );
79 error = 1;
80 }
81 if ( file && strstr( file, "vcodec-list" ) )
82 {
83 fprintf( stderr, "---\nvideo_codecs:\n" );
84 AVCodec *codec = NULL;
85 while ( ( codec = av_codec_next( codec ) ) )
86 if ( codec->decode && codec->type == CODEC_TYPE_VIDEO )
87 fprintf( stderr, " - %s\n", codec->name );
88 fprintf( stderr, "...\n" );
89 error = 1;
90 }
91 if ( error )
92 return NULL;
93
94 mlt_producer this = NULL;
95
96 // Check that we have a non-NULL argument
97 if ( file != NULL )
98 {
99 // Construct the producer
100 this = calloc( 1, sizeof( struct mlt_producer_s ) );
101
102 // Initialise it
103 if ( mlt_producer_init( this, NULL ) == 0 )
104 {
105 // Get the properties
106 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
107
108 // Set the resource property (required for all producers)
109 mlt_properties_set( properties, "resource", file );
110
111 // Register our get_frame implementation
112 this->get_frame = producer_get_frame;
113
114 // Open the file
115 if ( producer_open( this, profile, file ) != 0 )
116 {
117 // Clean up
118 mlt_producer_close( this );
119 this = NULL;
120 }
121 else
122 {
123 // Close the file to release resources for large playlists - reopen later as needed
124 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
125 mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
126 mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
127
128 // Default the user-selectable indices from the auto-detected indices
129 mlt_properties_set_int( properties, "audio_index", mlt_properties_get_int( properties, "_audio_index" ) );
130 mlt_properties_set_int( properties, "video_index", mlt_properties_get_int( properties, "_video_index" ) );
131 }
132 }
133 }
134
135 return this;
136 }
137
138 /** Find the default streams.
139 */
140
141 static mlt_properties find_default_streams( mlt_properties meta_media, AVFormatContext *context, int *audio_index, int *video_index )
142 {
143 int i;
144 char key[200];
145
146 mlt_properties_set_int( meta_media, "meta.media.nb_streams", context->nb_streams );
147
148 // Allow for multiple audio and video streams in the file and select first of each (if available)
149 for( i = 0; i < context->nb_streams; i++ )
150 {
151 // Get the codec context
152 AVStream *stream = context->streams[ i ];
153 if ( ! stream ) continue;
154 AVCodecContext *codec_context = stream->codec;
155 if ( ! codec_context ) continue;
156 AVCodec *codec = avcodec_find_decoder( codec_context->codec_id );
157 if ( ! codec ) continue;
158
159 snprintf( key, sizeof(key), "meta.media.%d.stream.type", i );
160
161 // Determine the type and obtain the first index of each type
162 switch( codec_context->codec_type )
163 {
164 case CODEC_TYPE_VIDEO:
165 if ( *video_index < 0 )
166 *video_index = i;
167 mlt_properties_set( meta_media, key, "video" );
168 snprintf( key, sizeof(key), "meta.media.%d.stream.frame_rate", i );
169 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->r_frame_rate ) );
170 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
171 snprintf( key, sizeof(key), "meta.media.%d.stream.sample_aspect_ratio", i );
172 mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->sample_aspect_ratio ) );
173 #endif
174 snprintf( key, sizeof(key), "meta.media.%d.codec.pix_fmt", i );
175 mlt_properties_set( meta_media, key, avcodec_get_pix_fmt_name( codec_context->pix_fmt ) );
176 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_aspect_ratio", i );
177 mlt_properties_set_double( meta_media, key, av_q2d( codec_context->sample_aspect_ratio ) );
178 break;
179 case CODEC_TYPE_AUDIO:
180 if ( *audio_index < 0 )
181 *audio_index = i;
182 mlt_properties_set( meta_media, key, "audio" );
183 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
184 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_fmt", i );
185 mlt_properties_set( meta_media, key, avcodec_get_sample_fmt_name( codec_context->sample_fmt ) );
186 #endif
187 snprintf( key, sizeof(key), "meta.media.%d.codec.sample_rate", i );
188 mlt_properties_set_int( meta_media, key, codec_context->sample_rate );
189 snprintf( key, sizeof(key), "meta.media.%d.codec.channels", i );
190 mlt_properties_set_int( meta_media, key, codec_context->channels );
191 break;
192 default:
193 break;
194 }
195 // snprintf( key, sizeof(key), "meta.media.%d.stream.time_base", i );
196 // mlt_properties_set_double( meta_media, key, av_q2d( context->streams[ i ]->time_base ) );
197 snprintf( key, sizeof(key), "meta.media.%d.codec.name", i );
198 mlt_properties_set( meta_media, key, codec->name );
199 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(55<<8)+0))
200 snprintf( key, sizeof(key), "meta.media.%d.codec.long_name", i );
201 mlt_properties_set( meta_media, key, codec->long_name );
202 #endif
203 snprintf( key, sizeof(key), "meta.media.%d.codec.bit_rate", i );
204 mlt_properties_set_int( meta_media, key, codec_context->bit_rate );
205 // snprintf( key, sizeof(key), "meta.media.%d.codec.time_base", i );
206 // mlt_properties_set_double( meta_media, key, av_q2d( codec_context->time_base ) );
207 snprintf( key, sizeof(key), "meta.media.%d.codec.profile", i );
208 mlt_properties_set_int( meta_media, key, codec_context->profile );
209 snprintf( key, sizeof(key), "meta.media.%d.codec.level", i );
210 mlt_properties_set_int( meta_media, key, codec_context->level );
211 }
212
213 return meta_media;
214 }
215
216 /** Producer file destructor.
217 */
218
219 static void producer_file_close( void *context )
220 {
221 if ( context != NULL )
222 {
223 // Lock the mutex now
224 avformat_lock( );
225
226 // Close the file
227 av_close_input_file( context );
228
229 // Unlock the mutex now
230 avformat_unlock( );
231 }
232 }
233
234 /** Producer file destructor.
235 */
236
237 static void producer_codec_close( void *codec )
238 {
239 if ( codec != NULL )
240 {
241 // Lock the mutex now
242 avformat_lock( );
243
244 // Close the file
245 avcodec_close( codec );
246
247 // Unlock the mutex now
248 avformat_unlock( );
249 }
250 }
251
252 static inline int dv_is_pal( AVPacket *pkt )
253 {
254 return pkt->data[3] & 0x80;
255 }
256
257 static int dv_is_wide( AVPacket *pkt )
258 {
259 int i = 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
260
261 for ( ; i < pkt->size; i += 5 /* packet size */ )
262 {
263 if ( pkt->data[ i ] == 0x61 )
264 {
265 uint8_t x = pkt->data[ i + 2 ] & 0x7;
266 return ( x == 2 ) || ( x == 7 );
267 }
268 }
269 return 0;
270 }
271
272 static double get_aspect_ratio( AVStream *stream, AVCodecContext *codec_context, AVPacket *pkt )
273 {
274 double aspect_ratio = 1.0;
275
276 if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
277 {
278 if ( pkt )
279 {
280 if ( dv_is_pal( pkt ) )
281 {
282 aspect_ratio = dv_is_wide( pkt )
283 ? 64.0/45.0 // 16:9 PAL
284 : 16.0/15.0; // 4:3 PAL
285 }
286 else
287 {
288 aspect_ratio = dv_is_wide( pkt )
289 ? 32.0/27.0 // 16:9 NTSC
290 : 8.0/9.0; // 4:3 NTSC
291 }
292 }
293 else
294 {
295 AVRational ar =
296 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
297 stream->sample_aspect_ratio;
298 #else
299 codec_context->sample_aspect_ratio;
300 #endif
301 // Override FFmpeg's notion of DV aspect ratios, which are
302 // based upon a width of 704. Since we do not have a normaliser
303 // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
304 // we just coerce the values to facilitate a passive behaviour through
305 // the rescale normaliser when using equivalent producers and consumers.
306 // = display_aspect / (width * height)
307 if ( ar.num == 10 && ar.den == 11 )
308 aspect_ratio = 8.0/9.0; // 4:3 NTSC
309 else if ( ar.num == 59 && ar.den == 54 )
310 aspect_ratio = 16.0/15.0; // 4:3 PAL
311 else if ( ar.num == 40 && ar.den == 33 )
312 aspect_ratio = 32.0/27.0; // 16:9 NTSC
313 else if ( ar.num == 118 && ar.den == 81 )
314 aspect_ratio = 64.0/45.0; // 16:9 PAL
315 }
316 }
317 else
318 {
319 AVRational codec_sar = codec_context->sample_aspect_ratio;
320 AVRational stream_sar =
321 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
322 stream->sample_aspect_ratio;
323 #else
324 { 0, 1 };
325 #endif
326 if ( codec_sar.num > 0 )
327 aspect_ratio = av_q2d( codec_sar );
328 else if ( stream_sar.num > 0 )
329 aspect_ratio = av_q2d( stream_sar );
330 }
331 return aspect_ratio;
332 }
333
334 /** Open the file.
335 */
336
337 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
338 {
339 // Return an error code (0 == no error)
340 int error = 0;
341
342 // Context for avformat
343 AVFormatContext *context = NULL;
344
345 // Get the properties
346 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
347
348 // We will treat everything with the producer fps
349 double fps = mlt_profile_fps( profile );
350
351 // Lock the mutex now
352 avformat_lock( );
353
354 // If "MRL", then create AVInputFormat
355 AVInputFormat *format = NULL;
356 AVFormatParameters *params = NULL;
357 char *standard = NULL;
358 char *mrl = strchr( file, ':' );
359
360 // AV option (0 = both, 1 = video, 2 = audio)
361 int av = 0;
362
363 // Setting lowest log level
364 av_log_set_level( -1 );
365
366 // Only if there is not a protocol specification that avformat can handle
367 if ( mrl && !url_exist( file ) )
368 {
369 // 'file' becomes format abbreviation
370 mrl[0] = 0;
371
372 // Lookup the format
373 format = av_find_input_format( file );
374
375 // Eat the format designator
376 file = ++mrl;
377
378 if ( format )
379 {
380 // Allocate params
381 params = calloc( sizeof( AVFormatParameters ), 1 );
382
383 // These are required by video4linux (defaults)
384 params->width = 640;
385 params->height = 480;
386 params->time_base= (AVRational){1,25};
387 // params->device = file;
388 params->channels = 2;
389 params->sample_rate = 48000;
390 }
391
392 // XXX: this does not work anymore since avdevice
393 // TODO: make producer_avddevice?
394 // Parse out params
395 mrl = strchr( file, '?' );
396 while ( mrl )
397 {
398 mrl[0] = 0;
399 char *name = strdup( ++mrl );
400 char *value = strchr( name, ':' );
401 if ( value )
402 {
403 value[0] = 0;
404 value++;
405 char *t = strchr( value, '&' );
406 if ( t )
407 t[0] = 0;
408 if ( !strcmp( name, "frame_rate" ) )
409 params->time_base.den = atoi( value );
410 else if ( !strcmp( name, "frame_rate_base" ) )
411 params->time_base.num = atoi( value );
412 else if ( !strcmp( name, "sample_rate" ) )
413 params->sample_rate = atoi( value );
414 else if ( !strcmp( name, "channels" ) )
415 params->channels = atoi( value );
416 else if ( !strcmp( name, "width" ) )
417 params->width = atoi( value );
418 else if ( !strcmp( name, "height" ) )
419 params->height = atoi( value );
420 else if ( !strcmp( name, "standard" ) )
421 {
422 standard = strdup( value );
423 params->standard = standard;
424 }
425 else if ( !strcmp( name, "av" ) )
426 av = atoi( value );
427 }
428 free( name );
429 mrl = strchr( mrl, '&' );
430 }
431 }
432
433 // Now attempt to open the file
434 error = av_open_input_file( &context, file, format, 0, params ) < 0;
435
436 // Cleanup AVFormatParameters
437 free( standard );
438 free( params );
439
440 // If successful, then try to get additional info
441 if ( error == 0 )
442 {
443 // Get the stream info
444 error = av_find_stream_info( context ) < 0;
445
446 // Continue if no error
447 if ( error == 0 )
448 {
449 // We will default to the first audio and video streams found
450 int audio_index = -1;
451 int video_index = -1;
452 int av_bypass = 0;
453
454 // Now set properties where we can (use default unknowns if required)
455 if ( context->duration != AV_NOPTS_VALUE )
456 {
457 // This isn't going to be accurate for all formats
458 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
459 mlt_properties_set_position( properties, "out", frames - 1 );
460 mlt_properties_set_position( properties, "length", frames );
461 }
462
463 // Find default audio and video streams
464 find_default_streams( properties, context, &audio_index, &video_index );
465
466 if ( context->start_time != AV_NOPTS_VALUE )
467 mlt_properties_set_double( properties, "_start_time", context->start_time );
468
469 // Check if we're seekable (something funny about mpeg here :-/)
470 if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) && strncmp( file, "udp:", 4 ) && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 ) && strncmp( file, "rtp:", 4 ) )
471 {
472 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
473 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
474 av_open_input_file( &context, file, NULL, 0, NULL );
475 av_find_stream_info( context );
476 }
477 else
478 av_bypass = 1;
479
480 // Store selected audio and video indexes on properties
481 mlt_properties_set_int( properties, "_audio_index", audio_index );
482 mlt_properties_set_int( properties, "_video_index", video_index );
483 mlt_properties_set_int( properties, "_last_position", -1 );
484
485 // Fetch the width, height and aspect ratio
486 if ( video_index != -1 )
487 {
488 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
489 mlt_properties_set_int( properties, "width", codec_context->width );
490 mlt_properties_set_int( properties, "height", codec_context->height );
491
492 if ( codec_context->codec_id == CODEC_ID_DVVIDEO )
493 {
494 // Fetch the first frame of DV so we can read it directly
495 AVPacket pkt;
496 int ret = 0;
497 while ( ret >= 0 )
498 {
499 ret = av_read_frame( context, &pkt );
500 if ( ret >= 0 && pkt.stream_index == video_index && pkt.size > 0 )
501 {
502 mlt_properties_set_double( properties, "aspect_ratio",
503 get_aspect_ratio( context->streams[ video_index ], codec_context, &pkt ) );
504 break;
505 }
506 }
507 }
508 else
509 {
510 mlt_properties_set_double( properties, "aspect_ratio",
511 get_aspect_ratio( context->streams[ video_index ], codec_context, NULL ) );
512 }
513 }
514
515 // Read Metadata
516 if (context->title != NULL)
517 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
518 if (context->author != NULL)
519 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
520 if (context->copyright != NULL)
521 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
522 if (context->comment != NULL)
523 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
524 if (context->album != NULL)
525 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
526 if (context->year != 0)
527 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
528 if (context->track != 0)
529 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
530
531 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
532 if ( av == 0 && audio_index != -1 && video_index != -1 )
533 {
534 // We'll use the open one as our video_context
535 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
536
537 // And open again for our audio context
538 av_open_input_file( &context, file, NULL, 0, NULL );
539 av_find_stream_info( context );
540
541 // Audio context
542 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
543 }
544 else if ( av != 2 && video_index != -1 )
545 {
546 // We only have a video context
547 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
548 }
549 else if ( audio_index != -1 )
550 {
551 // We only have an audio context
552 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
553 }
554 else
555 {
556 // Something has gone wrong
557 error = -1;
558 }
559
560 mlt_properties_set_int( properties, "av_bypass", av_bypass );
561 }
562 }
563
564 // Unlock the mutex now
565 avformat_unlock( );
566
567 return error;
568 }
569
570 /** Convert a frame position to a time code.
571 */
572
573 static double producer_time_of_frame( mlt_producer this, mlt_position position )
574 {
575 return ( double )position / mlt_producer_get_fps( this );
576 }
577
578 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
579 {
580 #ifdef SWSCALE
581 if ( format == mlt_image_yuv420p )
582 {
583 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
584 width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
585 AVPicture output;
586 output.data[0] = buffer;
587 output.data[1] = buffer + width * height;
588 output.data[2] = buffer + ( 3 * width * height ) / 2;
589 output.linesize[0] = width;
590 output.linesize[1] = width >> 1;
591 output.linesize[2] = width >> 1;
592 sws_scale( context, frame->data, frame->linesize, 0, height,
593 output.data, output.linesize);
594 sws_freeContext( context );
595 }
596 else if ( format == mlt_image_rgb24 )
597 {
598 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
599 width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
600 AVPicture output;
601 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
602 sws_scale( context, frame->data, frame->linesize, 0, height,
603 output.data, output.linesize);
604 sws_freeContext( context );
605 }
606 else
607 {
608 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
609 width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
610 AVPicture output;
611 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
612 sws_scale( context, frame->data, frame->linesize, 0, height,
613 output.data, output.linesize);
614 sws_freeContext( context );
615 }
616 #else
617 if ( format == mlt_image_yuv420p )
618 {
619 AVPicture pict;
620 pict.data[0] = buffer;
621 pict.data[1] = buffer + width * height;
622 pict.data[2] = buffer + ( 3 * width * height ) / 2;
623 pict.linesize[0] = width;
624 pict.linesize[1] = width >> 1;
625 pict.linesize[2] = width >> 1;
626 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
627 }
628 else if ( format == mlt_image_rgb24 )
629 {
630 AVPicture output;
631 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
632 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
633 }
634 else
635 {
636 AVPicture output;
637 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
638 img_convert( &output, PIX_FMT_YUYV422, (AVPicture *)frame, pix_fmt, width, height );
639 }
640 #endif
641 }
642
643 /** Allocate the image buffer and set it on the frame.
644 */
645
646 static int allocate_buffer( mlt_properties frame_properties, AVCodecContext *codec_context, uint8_t **buffer, mlt_image_format *format, int *width, int *height )
647 {
648 int size = 0;
649
650 if ( codec_context->width == 0 || codec_context->height == 0 )
651 return size;
652
653 *width = codec_context->width;
654 *height = codec_context->height;
655 mlt_properties_set_int( frame_properties, "width", *width );
656 mlt_properties_set_int( frame_properties, "height", *height );
657
658 switch ( *format )
659 {
660 case mlt_image_yuv420p:
661 size = *width * 3 * ( *height + 1 ) / 2;
662 break;
663 case mlt_image_rgb24:
664 size = *width * ( *height + 1 ) * 3;
665 break;
666 default:
667 *format = mlt_image_yuv422;
668 size = *width * ( *height + 1 ) * 2;
669 break;
670 }
671
672 // Construct the output image
673 *buffer = mlt_pool_alloc( size );
674 if ( *buffer )
675 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
676 else
677 size = 0;
678
679 return size;
680 }
681
682 /** Get an image from a frame.
683 */
684
685 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
686 {
687 // Get the properties from the frame
688 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
689
690 // Obtain the frame number of this frame
691 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
692
693 // Get the producer
694 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
695
696 // Get the producer properties
697 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
698
699 // Fetch the video_context
700 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
701
702 // Get the video_index
703 int index = mlt_properties_get_int( properties, "video_index" );
704
705 // Obtain the expected frame numer
706 mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
707
708 // Get the video stream
709 AVStream *stream = context->streams[ index ];
710
711 // Get codec context
712 AVCodecContext *codec_context = stream->codec;
713
714 // Packet
715 AVPacket pkt;
716
717 // Get the conversion frame
718 AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
719
720 // Special case pause handling flag
721 int paused = 0;
722
723 // Special case ffwd handling
724 int ignore = 0;
725
726 // We may want to use the source fps if available
727 double source_fps = mlt_properties_get_double( properties, "source_fps" );
728 double fps = mlt_producer_get_fps( this );
729
730 // This is the physical frame position in the source
731 int req_position = ( int )( position / fps * source_fps + 0.5 );
732
733 // Get the seekable status
734 int seekable = mlt_properties_get_int( properties, "seekable" );
735
736 // Hopefully provide better support for streams...
737 int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
738
739 // Determines if we have to decode all frames in a sequence
740 int must_decode = 1;
741
742 // Temporary hack to improve intra frame only
743 must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
744 strcmp( codec_context->codec->name, "rawvideo" ) &&
745 strcmp( codec_context->codec->name, "dvvideo" );
746
747 // Seek if necessary
748 if ( position != expected )
749 {
750 if ( av_frame != NULL && position + 1 == expected )
751 {
752 // We're paused - use last image
753 paused = 1;
754 }
755 else if ( !seekable && position > expected && ( position - expected ) < 250 )
756 {
757 // Fast forward - seeking is inefficient for small distances - just ignore following frames
758 ignore = ( int )( ( position - expected ) / fps * source_fps );
759 }
760 else if ( seekable && ( position < expected || position - expected >= 12 ) )
761 {
762 // Calculate the timestamp for the requested frame
763 int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
764 if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
765 timestamp += context->start_time;
766 if ( must_decode )
767 timestamp -= AV_TIME_BASE;
768 if ( timestamp < 0 )
769 timestamp = 0;
770
771 // Set to the timestamp
772 av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
773
774 // Remove the cached info relating to the previous position
775 mlt_properties_set_int( properties, "_current_position", -1 );
776 mlt_properties_set_int( properties, "_last_position", -1 );
777 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
778 av_frame = NULL;
779 }
780 }
781
782 // Duplicate the last image if necessary (see comment on rawvideo below)
783 int current_position = mlt_properties_get_int( properties, "_current_position" );
784 int got_picture = mlt_properties_get_int( properties, "_got_picture" );
785 if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
786 {
787 // Duplicate it
788 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
789 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
790 else
791 mlt_frame_get_image( frame, buffer, format, width, height, writable );
792 }
793 else
794 {
795 int ret = 0;
796 int int_position = 0;
797 got_picture = 0;
798
799 av_init_packet( &pkt );
800
801 // Construct an AVFrame for YUV422 conversion
802 if ( av_frame == NULL )
803 av_frame = avcodec_alloc_frame( );
804
805 while( ret >= 0 && !got_picture )
806 {
807 // Read a packet
808 ret = av_read_frame( context, &pkt );
809
810 // We only deal with video from the selected video_index
811 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
812 {
813 // Determine time code of the packet
814 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
815 if ( context->start_time != AV_NOPTS_VALUE )
816 int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
817 int last_position = mlt_properties_get_int( properties, "_last_position" );
818 if ( int_position == last_position )
819 int_position = last_position + 1;
820 mlt_properties_set_int( properties, "_last_position", int_position );
821
822 // Decode the image
823 if ( must_decode || int_position >= req_position )
824 ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
825
826 if ( got_picture )
827 {
828 // Handle ignore
829 if ( int_position < req_position )
830 {
831 ignore = 0;
832 got_picture = 0;
833 }
834 else if ( int_position >= req_position )
835 {
836 ignore = 0;
837 }
838 else if ( ignore -- )
839 {
840 got_picture = 0;
841 }
842 }
843 av_free_packet( &pkt );
844 }
845 else if ( ret >= 0 )
846 {
847 av_free_packet( &pkt );
848 }
849
850 // Now handle the picture if we have one
851 if ( got_picture )
852 {
853 if ( allocate_buffer( frame_properties, codec_context, buffer, format, width, height ) )
854 {
855 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
856 mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
857 mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
858 mlt_properties_set_int( properties, "_current_position", int_position );
859 mlt_properties_set_int( properties, "_got_picture", 1 );
860 mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
861 }
862 else
863 {
864 got_picture = 0;
865 }
866 }
867 }
868 if ( !got_picture )
869 mlt_frame_get_image( frame, buffer, format, width, height, writable );
870 }
871
872 // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
873 // above will break the pause behaviour - so we wipe the frame now
874 if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
875 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
876
877 // Set the field order property for this frame
878 mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
879
880 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
881 mlt_properties_set_position( properties, "_video_expected", position + 1 );
882
883 return 0;
884 }
885
886 /** Process properties as AVOptions and apply to AV context obj
887 */
888
889 static void apply_properties( void *obj, mlt_properties properties, int flags )
890 {
891 int i;
892 int count = mlt_properties_count( properties );
893 for ( i = 0; i < count; i++ )
894 {
895 const char *opt_name = mlt_properties_get_name( properties, i );
896 const AVOption *opt = av_find_opt( obj, opt_name, NULL, flags, flags );
897 if ( opt != NULL )
898 #if LIBAVCODEC_VERSION_INT >= ((52<<16)+(7<<8)+0)
899 av_set_string3( obj, opt_name, mlt_properties_get( properties, opt_name), 0, NULL );
900 #elif LIBAVCODEC_VERSION_INT >= ((51<<16)+(59<<8)+0)
901 av_set_string2( obj, opt_name, mlt_properties_get( properties, opt_name), 0 );
902 #else
903 av_set_string( obj, opt_name, mlt_properties_get( properties, opt_name) );
904 #endif
905 }
906 }
907
908 /** Set up video handling.
909 */
910
911 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
912 {
913 // Get the properties
914 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
915
916 // Fetch the video_context
917 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
918
919 // Get the video_index
920 int index = mlt_properties_get_int( properties, "video_index" );
921
922 // Reopen the file if necessary
923 if ( !context && index > -1 )
924 {
925 mlt_events_block( properties, this );
926 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
927 mlt_properties_get( properties, "resource" ) );
928 context = mlt_properties_get_data( properties, "video_context", NULL );
929 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
930 mlt_events_unblock( properties, this );
931
932 // Process properties as AVOptions
933 apply_properties( context, properties, AV_OPT_FLAG_DECODING_PARAM );
934 }
935
936 // Exception handling for video_index
937 if ( context && index >= (int) context->nb_streams )
938 {
939 // Get the last video stream
940 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
941 mlt_properties_set_int( properties, "video_index", index );
942 }
943 if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
944 {
945 // Invalidate the video stream
946 index = -1;
947 mlt_properties_set_int( properties, "video_index", index );
948 }
949
950 // Get the frame properties
951 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
952
953 if ( context && index > -1 )
954 {
955 // Get the video stream
956 AVStream *stream = context->streams[ index ];
957
958 // Get codec context
959 AVCodecContext *codec_context = stream->codec;
960
961 // Get the codec
962 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
963
964 // Update the video properties if the index changed
965 if ( index != mlt_properties_get_int( properties, "_video_index" ) )
966 {
967 // Reset the video properties if the index changed
968 mlt_properties_set_int( properties, "_video_index", index );
969 mlt_properties_set_data( properties, "video_codec", NULL, 0, NULL, NULL );
970 mlt_properties_set_int( properties, "width", codec_context->width );
971 mlt_properties_set_int( properties, "height", codec_context->height );
972 // TODO: get the first usable AVPacket and reset the stream position
973 mlt_properties_set_double( properties, "aspect_ratio",
974 get_aspect_ratio( context->streams[ index ], codec_context, NULL ) );
975 codec = NULL;
976 }
977
978 // Initialise the codec if necessary
979 if ( codec == NULL )
980 {
981 // Initialise multi-threading
982 int thread_count = mlt_properties_get_int( properties, "threads" );
983 if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
984 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
985 if ( thread_count > 1 )
986 {
987 avcodec_thread_init( codec_context, thread_count );
988 codec_context->thread_count = thread_count;
989 }
990
991 // Find the codec
992 codec = avcodec_find_decoder( codec_context->codec_id );
993
994 // If we don't have a codec and we can't initialise it, we can't do much more...
995 avformat_lock( );
996 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
997 {
998 // Now store the codec with its destructor
999 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
1000 }
1001 else
1002 {
1003 // Remember that we can't use this later
1004 mlt_properties_set_int( properties, "video_index", -1 );
1005 index = -1;
1006 }
1007 avformat_unlock( );
1008
1009 // Process properties as AVOptions
1010 apply_properties( codec_context, properties, AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1011 }
1012
1013 // No codec, no show...
1014 if ( codec && index > -1 )
1015 {
1016 double source_fps = 0;
1017 double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
1018 double aspect_ratio = ( force_aspect_ratio > 0.0 ) ?
1019 force_aspect_ratio : mlt_properties_get_double( properties, "aspect_ratio" );
1020
1021 // Determine the fps
1022 source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
1023
1024 // We'll use fps if it's available
1025 if ( source_fps > 0 )
1026 mlt_properties_set_double( properties, "source_fps", source_fps );
1027 else
1028 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
1029 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
1030
1031 // Set the width and height
1032 mlt_properties_set_int( frame_properties, "width", codec_context->width );
1033 mlt_properties_set_int( frame_properties, "height", codec_context->height );
1034 mlt_properties_set_int( frame_properties, "real_width", codec_context->width );
1035 mlt_properties_set_int( frame_properties, "real_height", codec_context->height );
1036 mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
1037
1038 mlt_frame_push_get_image( frame, producer_get_image );
1039 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1040 }
1041 else
1042 {
1043 mlt_properties_set_int( frame_properties, "test_image", 1 );
1044 }
1045 }
1046 else
1047 {
1048 mlt_properties_set_int( frame_properties, "test_image", 1 );
1049 }
1050 }
1051
1052 /** Get the audio from a frame.
1053 */
1054
1055 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
1056 {
1057 // Get the properties from the frame
1058 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1059
1060 // Obtain the frame number of this frame
1061 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
1062
1063 // Get the producer
1064 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
1065
1066 // Get the producer properties
1067 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1068
1069 // Fetch the audio_context
1070 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1071
1072 // Get the audio_index
1073 int index = mlt_properties_get_int( properties, "audio_index" );
1074
1075 // Get the seekable status
1076 int seekable = mlt_properties_get_int( properties, "seekable" );
1077
1078 // Obtain the expected frame numer
1079 mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
1080
1081 // Obtain the resample context if it exists (not always needed)
1082 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
1083
1084 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1085 // Get the format converter context if it exists
1086 AVAudioConvert *convert = mlt_properties_get_data( properties, "audio_convert", NULL );
1087 #endif
1088
1089 // Obtain the audio buffers
1090 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
1091 int16_t *decode_buffer = mlt_properties_get_data( properties, "decode_buffer", NULL );
1092 int16_t *convert_buffer = mlt_properties_get_data( properties, "convert_buffer", NULL );
1093
1094 // Get amount of audio used
1095 int audio_used = mlt_properties_get_int( properties, "_audio_used" );
1096
1097 // Calculate the real time code
1098 double real_timecode = producer_time_of_frame( this, position );
1099
1100 // Get the audio stream
1101 AVStream *stream = context->streams[ index ];
1102
1103 // Get codec context
1104 AVCodecContext *codec_context = stream->codec;
1105
1106 // Packet
1107 AVPacket pkt;
1108
1109 // Number of frames to ignore (for ffwd)
1110 int ignore = 0;
1111
1112 // Flag for paused (silence)
1113 int paused = 0;
1114
1115 // Check for resample and create if necessary
1116 if ( resample == NULL && codec_context->channels <= 2 )
1117 {
1118 // Create the resampler
1119 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
1120
1121 // And store it on properties
1122 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
1123 }
1124 else if ( resample == NULL )
1125 {
1126 *channels = codec_context->channels;
1127 *frequency = codec_context->sample_rate;
1128 }
1129
1130 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1131 // Check for audio format converter and create if necessary
1132 // TODO: support higher resolutions than 16-bit.
1133 if ( convert == NULL && codec_context->sample_fmt != SAMPLE_FMT_S16 )
1134 {
1135 // Create single channel converter for interleaved with no mixing matrix
1136 convert = av_audio_convert_alloc( SAMPLE_FMT_S16, 1, codec_context->sample_fmt, 1, NULL, 0 );
1137 mlt_properties_set_data( properties, "audio_convert", convert, 0, ( mlt_destructor )av_audio_convert_free, NULL );
1138 }
1139 #endif
1140
1141 // Check for audio buffer and create if necessary
1142 if ( audio_buffer == NULL )
1143 {
1144 // Allocate the audio buffer
1145 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1146
1147 // And store it on properties for reuse
1148 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1149 }
1150
1151 // Check for decoder buffer and create if necessary
1152 if ( decode_buffer == NULL )
1153 {
1154 // Allocate the audio buffer
1155 decode_buffer = av_malloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1156
1157 // And store it on properties for reuse
1158 mlt_properties_set_data( properties, "decode_buffer", decode_buffer, 0, ( mlt_destructor )av_free, NULL );
1159 }
1160
1161 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1162 // Check for format converter buffer and create if necessary
1163 if ( resample && convert && convert_buffer == NULL )
1164 {
1165 // Allocate the audio buffer
1166 convert_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
1167
1168 // And store it on properties for reuse
1169 mlt_properties_set_data( properties, "convert_buffer", convert_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1170 }
1171 #endif
1172
1173 // Seek if necessary
1174 if ( position != expected )
1175 {
1176 if ( position + 1 == expected )
1177 {
1178 // We're paused - silence required
1179 paused = 1;
1180 }
1181 else if ( !seekable && position > expected && ( position - expected ) < 250 )
1182 {
1183 // Fast forward - seeking is inefficient for small distances - just ignore following frames
1184 ignore = position - expected;
1185 }
1186 else if ( position < expected || position - expected >= 12 )
1187 {
1188 // Set to the real timecode
1189 if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
1190 paused = 1;
1191
1192 // Clear the usage in the audio buffer
1193 audio_used = 0;
1194 }
1195 }
1196
1197 // Get the audio if required
1198 if ( !paused )
1199 {
1200 int ret = 0;
1201 int got_audio = 0;
1202
1203 av_init_packet( &pkt );
1204
1205 while( ret >= 0 && !got_audio )
1206 {
1207 // Check if the buffer already contains the samples required
1208 if ( audio_used >= *samples && ignore == 0 )
1209 {
1210 got_audio = 1;
1211 break;
1212 }
1213
1214 // Read a packet
1215 ret = av_read_frame( context, &pkt );
1216
1217 int len = pkt.size;
1218 uint8_t *ptr = pkt.data;
1219
1220 // We only deal with audio from the selected audio_index
1221 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
1222 {
1223 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
1224
1225 // Decode the audio
1226 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
1227 ret = avcodec_decode_audio2( codec_context, decode_buffer, &data_size, ptr, len );
1228 #else
1229 ret = avcodec_decode_audio( codec_context, decode_buffer, &data_size, ptr, len );
1230 #endif
1231 if ( ret < 0 )
1232 {
1233 ret = 0;
1234 break;
1235 }
1236
1237 len -= ret;
1238 ptr += ret;
1239
1240 if ( data_size > 0 )
1241 {
1242 int src_stride[6]= { av_get_bits_per_sample_format( codec_context->sample_fmt ) / 8 };
1243 int dst_stride[6]= { av_get_bits_per_sample_format( SAMPLE_FMT_S16 ) / 8 };
1244
1245 if ( resample )
1246 {
1247 int16_t *source = decode_buffer;
1248 int16_t *dest = &audio_buffer[ audio_used * *channels ];
1249 int convert_samples = data_size / src_stride[0];
1250
1251 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1252 if ( convert )
1253 {
1254 const void *src_buf[6] = { decode_buffer };
1255 void *dst_buf[6] = { convert_buffer };
1256 av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, convert_samples );
1257 source = convert_buffer;
1258 }
1259 #endif
1260 audio_used += audio_resample( resample, dest, source, convert_samples / codec_context->channels );
1261 }
1262 else
1263 {
1264 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(71<<8)+0))
1265 if ( convert )
1266 {
1267 const void *src_buf[6] = { decode_buffer };
1268 void *dst_buf[6] = { &audio_buffer[ audio_used * *channels ] };
1269 av_audio_convert( convert, dst_buf, dst_stride, src_buf, src_stride, data_size / src_stride[0] );
1270 }
1271 else
1272 #endif
1273 {
1274 memcpy( &audio_buffer[ audio_used * *channels ], decode_buffer, data_size );
1275 }
1276 audio_used += data_size / *channels / src_stride[0];
1277 }
1278
1279 // Handle ignore
1280 while ( ignore && audio_used > *samples )
1281 {
1282 ignore --;
1283 audio_used -= *samples;
1284 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
1285 }
1286 }
1287
1288 // If we're behind, ignore this packet
1289 if ( pkt.pts >= 0 )
1290 {
1291 float current_pts = av_q2d( stream->time_base ) * pkt.pts;
1292 if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
1293 ignore = 1;
1294 }
1295 }
1296
1297 // We're finished with this packet regardless
1298 av_free_packet( &pkt );
1299 }
1300
1301 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
1302 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1303
1304 // Now handle the audio if we have enough
1305 if ( audio_used >= *samples )
1306 {
1307 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1308 audio_used -= *samples;
1309 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1310 }
1311 else
1312 {
1313 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1314 }
1315
1316 // Store the number of audio samples still available
1317 mlt_properties_set_int( properties, "_audio_used", audio_used );
1318 }
1319 else
1320 {
1321 // Get silence and don't touch the context
1322 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1323 }
1324
1325 // Regardless of speed (other than paused), we expect to get the next frame
1326 if ( !paused )
1327 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1328
1329 return 0;
1330 }
1331
1332 /** Set up audio handling.
1333 */
1334
1335 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1336 {
1337 // Get the properties
1338 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1339
1340 // Fetch the audio_context
1341 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1342
1343 // Get the audio_index
1344 int index = mlt_properties_get_int( properties, "audio_index" );
1345
1346 // Reopen the file if necessary
1347 if ( !context && index > -1 )
1348 {
1349 mlt_events_block( properties, this );
1350 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1351 mlt_properties_get( properties, "resource" ) );
1352 context = mlt_properties_get_data( properties, "audio_context", NULL );
1353 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
1354 mlt_events_unblock( properties, this );
1355 }
1356
1357 // Exception handling for audio_index
1358 if ( context && index >= (int) context->nb_streams )
1359 {
1360 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO; --index );
1361 mlt_properties_set_int( properties, "audio_index", index );
1362 }
1363 if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO )
1364 {
1365 index = -1;
1366 mlt_properties_set_int( properties, "audio_index", index );
1367 }
1368
1369 // Update the audio properties if the index changed
1370 if ( index > -1 && index != mlt_properties_get_int( properties, "_audio_index" ) )
1371 {
1372 mlt_properties_set_int( properties, "_audio_index", index );
1373 mlt_properties_set_data( properties, "audio_codec", NULL, 0, NULL, NULL );
1374 }
1375
1376 // Deal with audio context
1377 if ( context != NULL && index > -1 )
1378 {
1379 // Get the frame properties
1380 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1381
1382 // Get the audio stream
1383 AVStream *stream = context->streams[ index ];
1384
1385 // Get codec context
1386 AVCodecContext *codec_context = stream->codec;
1387
1388 // Get the codec
1389 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1390
1391 // Initialise the codec if necessary
1392 if ( codec == NULL )
1393 {
1394 // Find the codec
1395 codec = avcodec_find_decoder( codec_context->codec_id );
1396
1397 // If we don't have a codec and we can't initialise it, we can't do much more...
1398 avformat_lock( );
1399 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1400 {
1401 // Now store the codec with its destructor
1402 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1403
1404 }
1405 else
1406 {
1407 // Remember that we can't use this later
1408 mlt_properties_set_int( properties, "audio_index", -1 );
1409 index = -1;
1410 }
1411 avformat_unlock( );
1412
1413 // Process properties as AVOptions
1414 apply_properties( codec_context, properties, AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM );
1415 }
1416
1417 // No codec, no show...
1418 if ( codec && index > -1 )
1419 {
1420 mlt_frame_push_audio( frame, producer_get_audio );
1421 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1422 mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1423 mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1424 }
1425 }
1426 }
1427
1428 /** Our get frame implementation.
1429 */
1430
1431 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1432 {
1433 // Create an empty frame
1434 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1435
1436 // Update timecode on the frame we're creating
1437 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1438
1439 // Set the position of this producer
1440 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1441
1442 // Set up the video
1443 producer_set_up_video( this, *frame );
1444
1445 // Set up the audio
1446 producer_set_up_audio( this, *frame );
1447
1448 // Set the aspect_ratio
1449 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1450
1451 // Calculate the next timecode
1452 mlt_producer_prepare_next( this );
1453
1454 return 0;
1455 }
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