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producer_avformat.c: bugfix regression with audio_index and video_index in last relea...
[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
26 // ffmpeg Header files
27 #include <avformat.h>
28 #ifdef SWSCALE
29 #include <swscale.h>
30 #endif
31
32 // System header files
33 #include <stdlib.h>
34 #include <string.h>
35 #include <pthread.h>
36 #include <math.h>
37
38 void avformat_lock( );
39 void avformat_unlock( );
40
41 // Forward references.
42 static int producer_open( mlt_producer this, mlt_profile profile, char *file );
43 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index );
44
45 /** Constructor for libavformat.
46 */
47
48 mlt_producer producer_avformat_init( mlt_profile profile, char *file )
49 {
50 mlt_producer this = NULL;
51
52 // Check that we have a non-NULL argument
53 if ( file != NULL )
54 {
55 // Construct the producer
56 this = calloc( 1, sizeof( struct mlt_producer_s ) );
57
58 // Initialise it
59 if ( mlt_producer_init( this, NULL ) == 0 )
60 {
61 // Get the properties
62 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
63
64 // Set the resource property (required for all producers)
65 mlt_properties_set( properties, "resource", file );
66
67 // Register our get_frame implementation
68 this->get_frame = producer_get_frame;
69
70 // Open the file
71 if ( producer_open( this, profile, file ) != 0 )
72 {
73 // Clean up
74 mlt_producer_close( this );
75 this = NULL;
76 }
77 else
78 {
79 // Close the file to release resources for large playlists - reopen later as needed
80 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
81 mlt_properties_set_data( properties, "audio_context", NULL, 0, NULL, NULL );
82 mlt_properties_set_data( properties, "video_context", NULL, 0, NULL, NULL );
83
84 // Default the user-selectable indices from the auto-detected indices
85 mlt_properties_set_int( properties, "audio_index", mlt_properties_get_int( properties, "_audio_index" ) );
86 mlt_properties_set_int( properties, "video_index", mlt_properties_get_int( properties, "_video_index" ) );
87 }
88 }
89 }
90
91 return this;
92 }
93
94 /** Find the default streams.
95 */
96
97 static void find_default_streams( AVFormatContext *context, int *audio_index, int *video_index )
98 {
99 int i;
100
101 // Allow for multiple audio and video streams in the file and select first of each (if available)
102 for( i = 0; i < context->nb_streams; i++ )
103 {
104 // Get the codec context
105 AVCodecContext *codec_context = context->streams[ i ]->codec;
106
107 if ( avcodec_find_decoder( codec_context->codec_id ) == NULL )
108 continue;
109
110 // Determine the type and obtain the first index of each type
111 switch( codec_context->codec_type )
112 {
113 case CODEC_TYPE_VIDEO:
114 if ( *video_index < 0 )
115 *video_index = i;
116 break;
117 case CODEC_TYPE_AUDIO:
118 if ( *audio_index < 0 )
119 *audio_index = i;
120 break;
121 default:
122 break;
123 }
124 }
125 }
126
127 /** Producer file destructor.
128 */
129
130 static void producer_file_close( void *context )
131 {
132 if ( context != NULL )
133 {
134 // Lock the mutex now
135 avformat_lock( );
136
137 // Close the file
138 av_close_input_file( context );
139
140 // Unlock the mutex now
141 avformat_unlock( );
142 }
143 }
144
145 /** Producer file destructor.
146 */
147
148 static void producer_codec_close( void *codec )
149 {
150 if ( codec != NULL )
151 {
152 // Lock the mutex now
153 avformat_lock( );
154
155 // Close the file
156 avcodec_close( codec );
157
158 // Unlock the mutex now
159 avformat_unlock( );
160 }
161 }
162
163 /** Open the file.
164 */
165
166 static int producer_open( mlt_producer this, mlt_profile profile, char *file )
167 {
168 // Return an error code (0 == no error)
169 int error = 0;
170
171 // Context for avformat
172 AVFormatContext *context = NULL;
173
174 // Get the properties
175 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
176
177 // We will treat everything with the producer fps
178 double fps = mlt_profile_fps( profile );
179
180 // Lock the mutex now
181 avformat_lock( );
182
183 // If "MRL", then create AVInputFormat
184 AVInputFormat *format = NULL;
185 AVFormatParameters *params = NULL;
186 char *standard = NULL;
187 char *mrl = strchr( file, ':' );
188
189 // AV option (0 = both, 1 = video, 2 = audio)
190 int av = 0;
191
192 // Setting lowest log level
193 av_log_set_level( -1 );
194
195 // Only if there is not a protocol specification that avformat can handle
196 if ( mrl && !url_exist( file ) )
197 {
198 // 'file' becomes format abbreviation
199 mrl[0] = 0;
200
201 // Lookup the format
202 format = av_find_input_format( file );
203
204 // Eat the format designator
205 file = ++mrl;
206
207 if ( format )
208 {
209 // Allocate params
210 params = calloc( sizeof( AVFormatParameters ), 1 );
211
212 // These are required by video4linux (defaults)
213 params->width = 640;
214 params->height = 480;
215 params->time_base= (AVRational){1,25};
216 // params->device = file;
217 params->channels = 2;
218 params->sample_rate = 48000;
219 }
220
221 // XXX: this does not work anymore since avdevice
222 // TODO: make producer_avddevice?
223 // Parse out params
224 mrl = strchr( file, '?' );
225 while ( mrl )
226 {
227 mrl[0] = 0;
228 char *name = strdup( ++mrl );
229 char *value = strchr( name, ':' );
230 if ( value )
231 {
232 value[0] = 0;
233 value++;
234 char *t = strchr( value, '&' );
235 if ( t )
236 t[0] = 0;
237 if ( !strcmp( name, "frame_rate" ) )
238 params->time_base.den = atoi( value );
239 else if ( !strcmp( name, "frame_rate_base" ) )
240 params->time_base.num = atoi( value );
241 else if ( !strcmp( name, "sample_rate" ) )
242 params->sample_rate = atoi( value );
243 else if ( !strcmp( name, "channels" ) )
244 params->channels = atoi( value );
245 else if ( !strcmp( name, "width" ) )
246 params->width = atoi( value );
247 else if ( !strcmp( name, "height" ) )
248 params->height = atoi( value );
249 else if ( !strcmp( name, "standard" ) )
250 {
251 standard = strdup( value );
252 params->standard = standard;
253 }
254 else if ( !strcmp( name, "av" ) )
255 av = atoi( value );
256 }
257 free( name );
258 mrl = strchr( mrl, '&' );
259 }
260 }
261
262 // Now attempt to open the file
263 error = av_open_input_file( &context, file, format, 0, params ) < 0;
264
265 // Cleanup AVFormatParameters
266 free( standard );
267 free( params );
268
269 // If successful, then try to get additional info
270 if ( error == 0 )
271 {
272 // Get the stream info
273 error = av_find_stream_info( context ) < 0;
274
275 // Continue if no error
276 if ( error == 0 )
277 {
278 // We will default to the first audio and video streams found
279 int audio_index = -1;
280 int video_index = -1;
281 int av_bypass = 0;
282
283 // Now set properties where we can (use default unknowns if required)
284 if ( context->duration != AV_NOPTS_VALUE )
285 {
286 // This isn't going to be accurate for all formats
287 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps + 0.5 );
288 mlt_properties_set_position( properties, "out", frames - 1 );
289 mlt_properties_set_position( properties, "length", frames );
290 }
291
292 // Find default audio and video streams
293 find_default_streams( context, &audio_index, &video_index );
294
295 if ( context->start_time != AV_NOPTS_VALUE )
296 mlt_properties_set_double( properties, "_start_time", context->start_time );
297
298 // Check if we're seekable (something funny about mpeg here :-/)
299 if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) && strncmp( file, "udp:", 4 ) && strncmp( file, "tcp:", 4 ) && strncmp( file, "rtsp:", 5 ) && strncmp( file, "rtp:", 4 ) )
300 {
301 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
302 mlt_properties_set_data( properties, "dummy_context", context, 0, producer_file_close, NULL );
303 av_open_input_file( &context, file, NULL, 0, NULL );
304 av_find_stream_info( context );
305 }
306 else
307 av_bypass = 1;
308
309 // Store selected audio and video indexes on properties
310 mlt_properties_set_int( properties, "_audio_index", audio_index );
311 mlt_properties_set_int( properties, "_video_index", video_index );
312 mlt_properties_set_int( properties, "_last_position", -1 );
313
314 // Fetch the width, height and aspect ratio
315 if ( video_index != -1 )
316 {
317 AVCodecContext *codec_context = context->streams[ video_index ]->codec;
318 mlt_properties_set_int( properties, "width", codec_context->width );
319 mlt_properties_set_int( properties, "height", codec_context->height );
320 mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
321 }
322
323 // Read Metadata
324 if (context->title != NULL)
325 mlt_properties_set(properties, "meta.attr.title.markup", context->title );
326 if (context->author != NULL)
327 mlt_properties_set(properties, "meta.attr.author.markup", context->author );
328 if (context->copyright != NULL)
329 mlt_properties_set(properties, "meta.attr.copyright.markup", context->copyright );
330 if (context->comment != NULL)
331 mlt_properties_set(properties, "meta.attr.comment.markup", context->comment );
332 if (context->album != NULL)
333 mlt_properties_set(properties, "meta.attr.album.markup", context->album );
334 if (context->year != 0)
335 mlt_properties_set_int(properties, "meta.attr.year.markup", context->year );
336 if (context->track != 0)
337 mlt_properties_set_int(properties, "meta.attr.track.markup", context->track );
338
339 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
340 if ( av == 0 && audio_index != -1 && video_index != -1 )
341 {
342 // We'll use the open one as our video_context
343 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
344
345 // And open again for our audio context
346 av_open_input_file( &context, file, NULL, 0, NULL );
347 av_find_stream_info( context );
348
349 // Audio context
350 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
351 }
352 else if ( av != 2 && video_index != -1 )
353 {
354 // We only have a video context
355 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
356 }
357 else if ( audio_index != -1 )
358 {
359 // We only have an audio context
360 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
361 }
362 else
363 {
364 // Something has gone wrong
365 error = -1;
366 }
367
368 mlt_properties_set_int( properties, "av_bypass", av_bypass );
369 }
370 }
371
372 // Unlock the mutex now
373 avformat_unlock( );
374
375 return error;
376 }
377
378 /** Convert a frame position to a time code.
379 */
380
381 static double producer_time_of_frame( mlt_producer this, mlt_position position )
382 {
383 return ( double )position / mlt_producer_get_fps( this );
384 }
385
386 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
387 {
388 #ifdef SWSCALE
389 if ( format == mlt_image_yuv420p )
390 {
391 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
392 width, height, PIX_FMT_YUV420P, SWS_FAST_BILINEAR, NULL, NULL, NULL);
393 AVPicture output;
394 output.data[0] = buffer;
395 output.data[1] = buffer + width * height;
396 output.data[2] = buffer + ( 3 * width * height ) / 2;
397 output.linesize[0] = width;
398 output.linesize[1] = width >> 1;
399 output.linesize[2] = width >> 1;
400 sws_scale( context, frame->data, frame->linesize, 0, height,
401 output.data, output.linesize);
402 sws_freeContext( context );
403 }
404 else if ( format == mlt_image_rgb24 )
405 {
406 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
407 width, height, PIX_FMT_RGB24, SWS_FAST_BILINEAR, NULL, NULL, NULL);
408 AVPicture output;
409 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
410 sws_scale( context, frame->data, frame->linesize, 0, height,
411 output.data, output.linesize);
412 sws_freeContext( context );
413 }
414 else
415 {
416 struct SwsContext *context = sws_getContext( width, height, pix_fmt,
417 width, height, PIX_FMT_YUYV422, SWS_FAST_BILINEAR, NULL, NULL, NULL);
418 AVPicture output;
419 avpicture_fill( &output, buffer, PIX_FMT_YUYV422, width, height );
420 sws_scale( context, frame->data, frame->linesize, 0, height,
421 output.data, output.linesize);
422 sws_freeContext( context );
423 }
424 #else
425 if ( format == mlt_image_yuv420p )
426 {
427 AVPicture pict;
428 pict.data[0] = buffer;
429 pict.data[1] = buffer + width * height;
430 pict.data[2] = buffer + ( 3 * width * height ) / 2;
431 pict.linesize[0] = width;
432 pict.linesize[1] = width >> 1;
433 pict.linesize[2] = width >> 1;
434 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
435 }
436 else if ( format == mlt_image_rgb24 )
437 {
438 AVPicture output;
439 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
440 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
441 }
442 else
443 {
444 AVPicture output;
445 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
446 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
447 }
448 #endif
449 }
450
451 /** Get an image from a frame.
452 */
453
454 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
455 {
456 // Get the properties from the frame
457 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
458
459 // Obtain the frame number of this frame
460 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
461
462 // Get the producer
463 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
464
465 // Get the producer properties
466 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
467
468 // Fetch the video_context
469 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
470
471 // Get the video_index
472 int index = mlt_properties_get_int( properties, "video_index" );
473
474 // Obtain the expected frame numer
475 mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
476
477 // Get the video stream
478 AVStream *stream = context->streams[ index ];
479
480 // Get codec context
481 AVCodecContext *codec_context = stream->codec;
482
483 // Packet
484 AVPacket pkt;
485
486 // Get the conversion frame
487 AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
488
489 // Special case pause handling flag
490 int paused = 0;
491
492 // Special case ffwd handling
493 int ignore = 0;
494
495 // We may want to use the source fps if available
496 double source_fps = mlt_properties_get_double( properties, "source_fps" );
497 double fps = mlt_producer_get_fps( this );
498
499 // This is the physical frame position in the source
500 int req_position = ( int )( position / fps * source_fps + 0.5 );
501
502 // Get the seekable status
503 int seekable = mlt_properties_get_int( properties, "seekable" );
504
505 // Generate the size in bytes
506 int size = 0;
507
508 // Hopefully provide better support for streams...
509 int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
510
511 // Determines if we have to decode all frames in a sequence
512 int must_decode = 1;
513
514 // Set the result arguments that we know here (only *buffer is now required)
515 *width = codec_context->width;
516 *height = codec_context->height;
517
518 switch ( *format )
519 {
520 case mlt_image_yuv420p:
521 size = *width * 3 * ( *height + 1 ) / 2;
522 break;
523 case mlt_image_rgb24:
524 size = *width * ( *height + 1 ) * 3;
525 break;
526 default:
527 *format = mlt_image_yuv422;
528 size = *width * ( *height + 1 ) * 2;
529 break;
530 }
531
532 // Set this on the frame properties
533 mlt_properties_set_int( frame_properties, "width", *width );
534 mlt_properties_set_int( frame_properties, "height", *height );
535
536 // Construct the output image
537 *buffer = mlt_pool_alloc( size );
538
539 // Temporary hack to improve intra frame only
540 must_decode = strcmp( codec_context->codec->name, "mjpeg" ) &&
541 strcmp( codec_context->codec->name, "rawvideo" ) &&
542 strcmp( codec_context->codec->name, "dvvideo" );
543
544 // Seek if necessary
545 if ( position != expected )
546 {
547 if ( av_frame != NULL && position + 1 == expected )
548 {
549 // We're paused - use last image
550 paused = 1;
551 }
552 else if ( !seekable && position > expected && ( position - expected ) < 250 )
553 {
554 // Fast forward - seeking is inefficient for small distances - just ignore following frames
555 ignore = ( int )( ( position - expected ) / fps * source_fps );
556 }
557 else if ( seekable && ( position < expected || position - expected >= 12 ) )
558 {
559 // Calculate the timestamp for the requested frame
560 int64_t timestamp = ( int64_t )( ( double )req_position / source_fps * AV_TIME_BASE + 0.5 );
561 if ( ( uint64_t )context->start_time != AV_NOPTS_VALUE )
562 timestamp += context->start_time;
563 if ( must_decode )
564 timestamp -= AV_TIME_BASE;
565 if ( timestamp < 0 )
566 timestamp = 0;
567
568 // Set to the timestamp
569 av_seek_frame( context, -1, timestamp, AVSEEK_FLAG_BACKWARD );
570
571 // Remove the cached info relating to the previous position
572 mlt_properties_set_int( properties, "_current_position", -1 );
573 mlt_properties_set_int( properties, "_last_position", -1 );
574 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
575 av_frame = NULL;
576 }
577 }
578
579 // Duplicate the last image if necessary (see comment on rawvideo below)
580 int current_position = mlt_properties_get_int( properties, "_current_position" );
581 int got_picture = mlt_properties_get_int( properties, "_got_picture" );
582 if ( av_frame != NULL && got_picture && ( paused || current_position >= req_position ) && av_bypass == 0 )
583 {
584 // Duplicate it
585 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
586
587 // Set this on the frame properties
588 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
589 }
590 else
591 {
592 int ret = 0;
593 int int_position = 0;
594 got_picture = 0;
595
596 av_init_packet( &pkt );
597
598 // Construct an AVFrame for YUV422 conversion
599 if ( av_frame == NULL )
600 {
601 av_frame = avcodec_alloc_frame( );
602 mlt_properties_set_data( properties, "av_frame", av_frame, 0, av_free, NULL );
603 }
604
605 while( ret >= 0 && !got_picture )
606 {
607 // Read a packet
608 ret = av_read_frame( context, &pkt );
609
610 // We only deal with video from the selected video_index
611 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
612 {
613 // Determine time code of the packet
614 int_position = ( int )( av_q2d( stream->time_base ) * pkt.dts * source_fps + 0.5 );
615 if ( context->start_time != AV_NOPTS_VALUE )
616 int_position -= ( int )( context->start_time * source_fps / AV_TIME_BASE + 0.5 );
617 int last_position = mlt_properties_get_int( properties, "_last_position" );
618 if ( int_position == last_position )
619 int_position = last_position + 1;
620 mlt_properties_set_int( properties, "_last_position", int_position );
621
622 // Decode the image
623 if ( must_decode || int_position >= req_position )
624 ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
625
626 if ( got_picture )
627 {
628 // Handle ignore
629 if ( int_position < req_position )
630 {
631 ignore = 0;
632 got_picture = 0;
633 }
634 else if ( int_position >= req_position )
635 {
636 ignore = 0;
637 }
638 else if ( ignore -- )
639 {
640 got_picture = 0;
641 }
642 }
643 av_free_packet( &pkt );
644 }
645 else if ( ret >= 0 )
646 {
647 av_free_packet( &pkt );
648 }
649
650 // Now handle the picture if we have one
651 if ( got_picture )
652 {
653 mlt_properties_set_int( frame_properties, "progressive", !av_frame->interlaced_frame );
654 mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
655 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
656 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
657 mlt_properties_set_int( properties, "_current_position", int_position );
658 mlt_properties_set_int( properties, "_got_picture", 1 );
659 }
660 }
661 if ( !got_picture )
662 mlt_frame_get_image( frame, buffer, format, width, height, writable );
663 }
664
665 // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
666 // above will break the pause behaviour - so we wipe the frame now
667 if ( !strcmp( codec_context->codec->name, "rawvideo" ) )
668 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
669
670 // Set the field order property for this frame
671 mlt_properties_set_int( frame_properties, "top_field_first", mlt_properties_get_int( properties, "top_field_first" ) );
672
673 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
674 mlt_properties_set_position( properties, "_video_expected", position + 1 );
675
676 return 0;
677 }
678
679 /** Set up video handling.
680 */
681
682 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
683 {
684 // Get the properties
685 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
686
687 // Fetch the video_context
688 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
689
690 // Get the video_index
691 int index = mlt_properties_get_int( properties, "video_index" );
692
693 // Reopen the file if necessary
694 if ( !context && index > -1 )
695 {
696 mlt_events_block( properties, this );
697 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
698 mlt_properties_get( properties, "resource" ) );
699 context = mlt_properties_get_data( properties, "video_context", NULL );
700 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
701 mlt_events_unblock( properties, this );
702 }
703
704 // Exception handling for video_index
705 if ( context && index >= (int) context->nb_streams )
706 {
707 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO; --index );
708 }
709 if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_VIDEO )
710 index = -1;
711 mlt_properties_set_int( properties, "video_index", index );
712
713 // Get the frame properties
714 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
715
716 if ( context != NULL && index > -1 )
717 {
718 // Get the video stream
719 AVStream *stream = context->streams[ index ];
720
721 // Get codec context
722 AVCodecContext *codec_context = stream->codec;
723
724 // Get the codec
725 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
726
727 // Initialise the codec if necessary
728 if ( codec == NULL )
729 {
730 // Initialise multi-threading
731 int thread_count = mlt_properties_get_int( properties, "threads" );
732 if ( thread_count == 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
733 thread_count = atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
734 if ( thread_count > 1 )
735 {
736 avcodec_thread_init( codec_context, thread_count );
737 codec_context->thread_count = thread_count;
738 }
739
740 // Find the codec
741 codec = avcodec_find_decoder( codec_context->codec_id );
742
743 // If we don't have a codec and we can't initialise it, we can't do much more...
744 avformat_lock( );
745 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
746 {
747 // Now store the codec with its destructor
748 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
749 }
750 else
751 {
752 // Remember that we can't use this later
753 mlt_properties_set_int( properties, "video_index", -1 );
754 }
755 avformat_unlock( );
756 }
757
758 // No codec, no show...
759 if ( codec != NULL )
760 {
761 double source_fps = 0;
762 int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
763 double force_aspect_ratio = mlt_properties_get_double( properties, "force_aspect_ratio" );
764 double aspect_ratio;
765
766 if ( strcmp( codec_context->codec->name, "dvvideo" ) == 0 )
767 {
768 // Override FFmpeg's notion of DV aspect ratios, which are
769 // based upon a width of 704. Since we do not have a normaliser
770 // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
771 // we just coerce the values to facilitate a passive behaviour through
772 // the rescale normaliser when using equivalent producers and consumers.
773 // = display_aspect / (width * height)
774 if ( codec_context->sample_aspect_ratio.num == 10 &&
775 codec_context->sample_aspect_ratio.den == 11 )
776 force_aspect_ratio = 8.0/9.0; // 4:3 NTSC
777 else if ( codec_context->sample_aspect_ratio.num == 59 &&
778 codec_context->sample_aspect_ratio.den == 54 )
779 force_aspect_ratio = 16.0/15.0; // 4:3 PAL
780 else if ( codec_context->sample_aspect_ratio.num == 40 &&
781 codec_context->sample_aspect_ratio.den == 33 )
782 force_aspect_ratio = 32.0/27.0; // 16:9 NTSC
783 else if ( codec_context->sample_aspect_ratio.num == 118 &&
784 codec_context->sample_aspect_ratio.den == 81 )
785 force_aspect_ratio = 64.0/45.0; // 16:9 PAL
786 }
787
788 // XXX: We won't know the real aspect ratio until an image is decoded
789 // but we do need it now (to satisfy filter_resize) - take a guess based
790 // on pal/ntsc
791 if ( force_aspect_ratio > 0.0 )
792 {
793 aspect_ratio = force_aspect_ratio;
794 }
795 else if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
796 {
797 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
798 }
799 else
800 {
801 aspect_ratio = 1.0;
802 }
803
804 // Determine the fps
805 source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
806
807 // We'll use fps if it's available
808 if ( source_fps > 0 )
809 mlt_properties_set_double( properties, "source_fps", source_fps );
810 else
811 mlt_properties_set_double( properties, "source_fps", mlt_producer_get_fps( this ) );
812 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
813
814 // Set the width and height
815 mlt_properties_set_int( frame_properties, "width", codec_context->width );
816 mlt_properties_set_int( frame_properties, "height", codec_context->height );
817 mlt_properties_set_double( frame_properties, "aspect_ratio", aspect_ratio );
818
819 mlt_frame_push_get_image( frame, producer_get_image );
820 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
821 }
822 else
823 {
824 mlt_properties_set_int( frame_properties, "test_image", 1 );
825 }
826 }
827 else
828 {
829 mlt_properties_set_int( frame_properties, "test_image", 1 );
830 }
831 }
832
833 /** Get the audio from a frame.
834 */
835
836 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
837 {
838 // Get the properties from the frame
839 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
840
841 // Obtain the frame number of this frame
842 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
843
844 // Get the producer
845 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
846
847 // Get the producer properties
848 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
849
850 // Fetch the audio_context
851 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
852
853 // Get the audio_index
854 int index = mlt_properties_get_int( properties, "audio_index" );
855
856 // Get the seekable status
857 int seekable = mlt_properties_get_int( properties, "seekable" );
858
859 // Obtain the expected frame numer
860 mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
861
862 // Obtain the resample context if it exists (not always needed)
863 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
864
865 // Obtain the audio buffer
866 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
867
868 // Get amount of audio used
869 int audio_used = mlt_properties_get_int( properties, "_audio_used" );
870
871 // Calculate the real time code
872 double real_timecode = producer_time_of_frame( this, position );
873
874 // Get the audio stream
875 AVStream *stream = context->streams[ index ];
876
877 // Get codec context
878 AVCodecContext *codec_context = stream->codec;
879
880 // Packet
881 AVPacket pkt;
882
883 // Number of frames to ignore (for ffwd)
884 int ignore = 0;
885
886 // Flag for paused (silence)
887 int paused = 0;
888
889 // Check for resample and create if necessary
890 if ( resample == NULL && codec_context->channels <= 2 )
891 {
892 // Create the resampler
893 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
894
895 // And store it on properties
896 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
897 }
898 else if ( resample == NULL )
899 {
900 *channels = codec_context->channels;
901 *frequency = codec_context->sample_rate;
902 }
903
904 // Check for audio buffer and create if necessary
905 if ( audio_buffer == NULL )
906 {
907 // Allocate the audio buffer
908 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
909
910 // And store it on properties for reuse
911 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
912 }
913
914 // Seek if necessary
915 if ( position != expected )
916 {
917 if ( position + 1 == expected )
918 {
919 // We're paused - silence required
920 paused = 1;
921 }
922 else if ( !seekable && position > expected && ( position - expected ) < 250 )
923 {
924 // Fast forward - seeking is inefficient for small distances - just ignore following frames
925 ignore = position - expected;
926 }
927 else if ( position < expected || position - expected >= 12 )
928 {
929 // Set to the real timecode
930 if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
931 paused = 1;
932
933 // Clear the usage in the audio buffer
934 audio_used = 0;
935 }
936 }
937
938 // Get the audio if required
939 if ( !paused )
940 {
941 int ret = 0;
942 int got_audio = 0;
943 int16_t *temp = av_malloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
944
945 av_init_packet( &pkt );
946
947 while( ret >= 0 && !got_audio )
948 {
949 // Check if the buffer already contains the samples required
950 if ( audio_used >= *samples && ignore == 0 )
951 {
952 got_audio = 1;
953 break;
954 }
955
956 // Read a packet
957 ret = av_read_frame( context, &pkt );
958
959 int len = pkt.size;
960 uint8_t *ptr = pkt.data;
961
962 // We only deal with audio from the selected audio_index
963 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
964 {
965 int data_size = sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE;
966
967 // Decode the audio
968 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
969 ret = avcodec_decode_audio2( codec_context, temp, &data_size, ptr, len );
970 #else
971 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
972 #endif
973 if ( ret < 0 )
974 {
975 ret = 0;
976 break;
977 }
978
979 len -= ret;
980 ptr += ret;
981
982 if ( data_size > 0 )
983 {
984 if ( resample != NULL )
985 {
986 audio_used += audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
987 }
988 else
989 {
990 memcpy( &audio_buffer[ audio_used * *channels ], temp, data_size );
991 audio_used += data_size / ( codec_context->channels * sizeof( int16_t ) );
992 }
993
994 // Handle ignore
995 while ( ignore && audio_used > *samples )
996 {
997 ignore --;
998 audio_used -= *samples;
999 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
1000 }
1001 }
1002
1003 // If we're behind, ignore this packet
1004 if ( pkt.pts >= 0 )
1005 {
1006 float current_pts = av_q2d( stream->time_base ) * pkt.pts;
1007 if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
1008 ignore = 1;
1009 }
1010 }
1011
1012 // We're finished with this packet regardless
1013 av_free_packet( &pkt );
1014 }
1015
1016 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
1017 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
1018
1019 // Now handle the audio if we have enough
1020 if ( audio_used >= *samples )
1021 {
1022 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
1023 audio_used -= *samples;
1024 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
1025 }
1026 else
1027 {
1028 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
1029 }
1030
1031 // Store the number of audio samples still available
1032 mlt_properties_set_int( properties, "_audio_used", audio_used );
1033
1034 // Release the temporary audio
1035 av_free( temp );
1036 }
1037 else
1038 {
1039 // Get silence and don't touch the context
1040 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
1041 }
1042
1043 // Regardless of speed (other than paused), we expect to get the next frame
1044 if ( !paused )
1045 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
1046
1047 return 0;
1048 }
1049
1050 /** Set up audio handling.
1051 */
1052
1053 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
1054 {
1055 // Get the properties
1056 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
1057
1058 // Fetch the audio_context
1059 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
1060
1061 // Get the audio_index
1062 int index = mlt_properties_get_int( properties, "audio_index" );
1063
1064 // Reopen the file if necessary
1065 if ( !context && index > -1 )
1066 {
1067 mlt_events_block( properties, this );
1068 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1069 mlt_properties_get( properties, "resource" ) );
1070 context = mlt_properties_get_data( properties, "audio_context", NULL );
1071 mlt_properties_set_data( properties, "dummy_context", NULL, 0, NULL, NULL );
1072 mlt_events_unblock( properties, this );
1073 }
1074
1075 // Exception handling for audio_index
1076 if ( context && index >= (int) context->nb_streams )
1077 {
1078 for ( index = context->nb_streams - 1; index >= 0 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO; --index );
1079 }
1080 if ( context && index > -1 && context->streams[ index ]->codec->codec_type != CODEC_TYPE_AUDIO )
1081 index = -1;
1082 mlt_properties_set_int( properties, "audio_index", index );
1083
1084 // Deal with audio context
1085 if ( context != NULL && index > -1 )
1086 {
1087 // Get the frame properties
1088 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
1089
1090 // Get the audio stream
1091 AVStream *stream = context->streams[ index ];
1092
1093 // Get codec context
1094 AVCodecContext *codec_context = stream->codec;
1095
1096 // Get the codec
1097 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
1098
1099 // Initialise the codec if necessary
1100 if ( codec == NULL )
1101 {
1102 // Find the codec
1103 codec = avcodec_find_decoder( codec_context->codec_id );
1104
1105 // If we don't have a codec and we can't initialise it, we can't do much more...
1106 avformat_lock( );
1107 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
1108 {
1109 // Now store the codec with its destructor
1110 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
1111
1112 }
1113 else
1114 {
1115 // Remember that we can't use this later
1116 mlt_properties_set_int( properties, "audio_index", -1 );
1117 }
1118 avformat_unlock( );
1119 }
1120
1121 // No codec, no show...
1122 if ( codec != NULL )
1123 {
1124 mlt_frame_push_audio( frame, producer_get_audio );
1125 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
1126 mlt_properties_set_int( frame_properties, "frequency", codec_context->sample_rate );
1127 mlt_properties_set_int( frame_properties, "channels", codec_context->channels );
1128 }
1129 }
1130 }
1131
1132 /** Our get frame implementation.
1133 */
1134
1135 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
1136 {
1137 // Create an empty frame
1138 *frame = mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1139
1140 // Update timecode on the frame we're creating
1141 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1142
1143 // Set the position of this producer
1144 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1145
1146 // Set up the video
1147 producer_set_up_video( this, *frame );
1148
1149 // Set up the audio
1150 producer_set_up_audio( this, *frame );
1151
1152 // Set the aspect_ratio
1153 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1154
1155 // Calculate the next timecode
1156 mlt_producer_prepare_next( this );
1157
1158 return 0;
1159 }
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