2 * producer_avformat.c -- avformat producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
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.
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.
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.
22 #include "producer_avformat.h"
25 #include <framework/mlt_frame.h>
27 // ffmpeg Header files
30 // System header files
36 void avformat_lock( );
37 void avformat_unlock( );
39 // Forward references.
40 static int producer_open( mlt_producer
this, char *file
);
41 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
);
43 /** Constructor for libavformat.
46 mlt_producer
producer_avformat_init( char *file
)
48 mlt_producer
this = NULL
;
50 // Check that we have a non-NULL argument
53 // Construct the producer
54 this = calloc( 1, sizeof( struct mlt_producer_s
) );
57 if ( mlt_producer_init( this, NULL
) == 0 )
60 mlt_properties properties
= mlt_producer_properties( this );
62 // Set the resource property (required for all producers)
63 mlt_properties_set( properties
, "resource", file
);
65 // Register our get_frame implementation
66 this->get_frame
= producer_get_frame
;
69 if ( producer_open( this, file
) != 0 )
72 mlt_producer_close( this );
81 /** Find the default streams.
84 static void find_default_streams( AVFormatContext
*context
, int *audio_index
, int *video_index
)
88 // Allow for multiple audio and video streams in the file and select first of each (if available)
89 for( i
= 0; i
< context
->nb_streams
; i
++ )
91 // Get the codec context
92 AVCodecContext
*codec_context
= &context
->streams
[ i
]->codec
;
94 // Determine the type and obtain the first index of each type
95 switch( codec_context
->codec_type
)
97 case CODEC_TYPE_VIDEO
:
98 if ( *video_index
< 0 )
101 case CODEC_TYPE_AUDIO
:
102 if ( *audio_index
< 0 )
111 /** Producer file destructor.
114 static void producer_file_close( void *context
)
116 if ( context
!= NULL
)
118 // Lock the mutex now
122 av_close_input_file( context
);
124 // Unlock the mutex now
129 /** Producer file destructor.
132 static void producer_codec_close( void *codec
)
136 // Lock the mutex now
140 avcodec_close( codec
);
142 // Unlock the mutex now
150 static int producer_open( mlt_producer
this, char *file
)
152 // Return an error code (0 == no error)
155 // Context for avformat
156 AVFormatContext
*context
= NULL
;
158 // Get the properties
159 mlt_properties properties
= mlt_producer_properties( this );
161 // We will treat everything with the producer fps
162 double fps
= mlt_properties_get_double( properties
, "fps" );
164 // Lock the mutex now
167 // If "MRL", then create AVInputFormat
168 AVInputFormat
*format
= NULL
;
169 AVFormatParameters
*params
= NULL
;
170 char *standard
= NULL
;
171 char *mrl
= strchr( file
, ':' );
173 // Only if there is not a protocol specification that avformat can handle
174 if ( mrl
&& !url_exist( file
) )
176 // 'file' becomes format abbreviation
180 format
= av_find_input_format( file
);
182 // Eat the format designator
188 params
= calloc( sizeof( AVFormatParameters
), 1 );
190 // These are required by video4linux (defaults)
192 params
->height
= 480;
193 params
->frame_rate
= 25;
194 params
->frame_rate_base
= 1;
195 params
->device
= file
;
196 params
->channels
= 2;
197 params
->sample_rate
= 48000;
201 mrl
= strchr( file
, '?' );
205 char *name
= strdup( ++mrl
);
206 char *value
= strchr( name
, ':' );
211 char *t
= strchr( value
, '&' );
214 if ( !strcmp( name
, "frame_rate" ) )
215 params
->frame_rate
= atoi( value
);
216 else if ( !strcmp( name
, "frame_rate_base" ) )
217 params
->frame_rate_base
= atoi( value
);
218 else if ( !strcmp( name
, "sample_rate" ) )
219 params
->sample_rate
= atoi( value
);
220 else if ( !strcmp( name
, "channels" ) )
221 params
->channels
= atoi( value
);
222 else if ( !strcmp( name
, "width" ) )
223 params
->width
= atoi( value
);
224 else if ( !strcmp( name
, "height" ) )
225 params
->height
= atoi( value
);
226 else if ( !strcmp( name
, "standard" ) )
228 standard
= strdup( value
);
229 params
->standard
= standard
;
233 mrl
= strchr( mrl
, '&' );
237 // Now attempt to open the file
238 error
= av_open_input_file( &context
, file
, format
, 0, params
);
241 // Cleanup AVFormatParameters
245 // If successful, then try to get additional info
248 // Get the stream info
249 error
= av_find_stream_info( context
) < 0;
251 // Continue if no error
254 // We will default to the first audio and video streams found
255 int audio_index
= -1;
256 int video_index
= -1;
258 // Now set properties where we can (use default unknowns if required)
259 if ( context
->duration
!= AV_NOPTS_VALUE
)
261 // This isn't going to be accurate for all formats
262 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
);
263 mlt_properties_set_position( properties
, "out", frames
- 2 );
264 mlt_properties_set_position( properties
, "length", frames
- 1 );
267 // Find default audio and video streams
268 find_default_streams( context
, &audio_index
, &video_index
);
270 if ( context
->start_time
!= AV_NOPTS_VALUE
)
271 mlt_properties_set_double( properties
, "start_time", context
->start_time
);
273 // Check if we're seekable (something funny about mpeg here :-/)
274 mlt_properties_set_int( properties
, "seekable", av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) ) >= 0 );
276 // Store selected audio and video indexes on properties
277 mlt_properties_set_int( properties
, "audio_index", audio_index
);
278 mlt_properties_set_int( properties
, "video_index", video_index
);
280 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
281 if ( audio_index
!= -1 && video_index
!= -1 )
283 // We'll use the open one as our video_context
284 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
286 // And open again for our audio context
287 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
288 av_find_stream_info( context
);
291 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
293 else if ( video_index
!= -1 )
295 // We only have a video context
296 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
298 else if ( audio_index
!= -1 )
300 // We only have an audio context
301 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
305 // Something has gone wrong
311 // Unlock the mutex now
317 /** Convert a frame position to a time code.
320 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
322 // Get the properties
323 mlt_properties properties
= mlt_producer_properties( this );
326 double fps
= mlt_properties_get_double( properties
, "fps" );
329 return ( double )position
/ fps
;
332 /** Get an image from a frame.
335 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
337 // Get the properties from the frame
338 mlt_properties frame_properties
= mlt_frame_properties( frame
);
340 // Obtain the frame number of this frame
341 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
344 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
346 // Get the producer properties
347 mlt_properties properties
= mlt_producer_properties( this );
349 // Fetch the video_context
350 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
352 // Get the video_index
353 int index
= mlt_properties_get_int( properties
, "video_index" );
355 // Obtain the expected frame numer
356 mlt_position expected
= mlt_properties_get_position( properties
, "video_expected" );
358 // Calculate the real time code
359 double real_timecode
= producer_time_of_frame( this, position
);
361 // Get the video stream
362 AVStream
*stream
= context
->streams
[ index
];
365 AVCodecContext
*codec_context
= &stream
->codec
;
370 // Get the conversion frame
371 AVPicture
*output
= mlt_properties_get_data( properties
, "video_output_frame", NULL
);
373 // Special case pause handling flag
376 // Special case ffwd handling
379 // Current time calcs
380 double current_time
= mlt_properties_get_double( properties
, "current_time" );
382 // We may want to use the source fps if available
383 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
385 // Get the seekable status
386 int seekable
= mlt_properties_get_int( properties
, "seekable" );
388 // Set the result arguments that we know here (only *buffer is now required)
389 *format
= mlt_image_yuv422
;
390 *width
= codec_context
->width
;
391 *height
= codec_context
->height
;
393 // Set this on the frame properties
394 mlt_properties_set_int( frame_properties
, "width", *width
);
395 mlt_properties_set_int( frame_properties
, "height", *height
);
397 // Construct an AVFrame for YUV422 conversion
398 if ( output
== NULL
)
400 int size
= avpicture_get_size( PIX_FMT_YUV422
, *width
, *height
+ 1 );
401 uint8_t *buf
= mlt_pool_alloc( size
);
402 output
= mlt_pool_alloc( sizeof( AVPicture
) );
403 avpicture_fill( output
, buf
, PIX_FMT_YUV422
, *width
, *height
);
404 mlt_properties_set_data( properties
, "video_output_frame", output
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
405 mlt_properties_set_data( properties
, "video_output_buffer", buf
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
409 if ( position
!= expected
)
411 if ( position
+ 1 == expected
)
413 // We're paused - use last image
416 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
418 // Fast forward - seeking is inefficient for small distances - just ignore following frames
419 ignore
= position
- expected
;
423 // Set to the real timecode
424 av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) + real_timecode
* 1000000.0 );
426 // Remove the cached info relating to the previous position
427 mlt_properties_set_double( properties
, "current_time", real_timecode
);
428 mlt_properties_set_data( properties
, "current_image", NULL
, 0, NULL
, NULL
);
432 // Duplicate the last image if necessary
433 if ( mlt_properties_get_data( properties
, "current_image", NULL
) != NULL
&&
434 ( paused
|| mlt_properties_get_double( properties
, "current_time" ) >= real_timecode
) )
436 // Get current image and size
438 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
441 *buffer
= mlt_pool_alloc( size
);
442 memcpy( *buffer
, image
, size
);
444 // Set this on the frame properties
445 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
453 memset( &pkt
, 0, sizeof( pkt
) );
454 memset( &frame
, 0, sizeof( frame
) );
456 while( ret
>= 0 && !got_picture
)
459 ret
= av_read_frame( context
, &pkt
);
461 // We only deal with video from the selected video_index
462 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
465 ret
= avcodec_decode_video( codec_context
, &frame
, &got_picture
, pkt
.data
, pkt
.size
);
469 if ( pkt
.pts
!= AV_NOPTS_VALUE
)
470 current_time
= ( double )pkt
.pts
/ 1000000.0;
472 current_time
= real_timecode
;
475 if ( ( int )( current_time
* 100 ) < ( int )( real_timecode
* 100 ) - 7 )
480 else if ( current_time
>= real_timecode
)
482 //current_time = real_timecode;
485 else if ( ignore
-- )
489 mlt_properties_set_int( properties
, "top_field_first", frame
.top_field_first
);
493 // We're finished with this packet regardless
494 av_free_packet( &pkt
);
497 // Now handle the picture if we have one
500 // Get current image and size
502 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
504 if ( image
== NULL
|| size
!= *width
* *height
* 2 )
506 size
= *width
* ( *height
+ 1 ) * 2;
507 image
= mlt_pool_alloc( size
);
508 mlt_properties_set_data( properties
, "current_image", image
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
511 *buffer
= mlt_pool_alloc( size
);
513 // EXPERIMENTAL IMAGE NORMALISATIONS
514 if ( codec_context
->pix_fmt
== PIX_FMT_YUV420P
)
517 register int half
= *width
>> 1;
518 register uint8_t *Y
= ( ( AVPicture
* )&frame
)->data
[ 0 ];
519 register uint8_t *U
= ( ( AVPicture
* )&frame
)->data
[ 1 ];
520 register uint8_t *V
= ( ( AVPicture
* )&frame
)->data
[ 2 ];
521 register uint8_t *d
= *buffer
;
522 register uint8_t *y
, *u
, *v
;
539 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
552 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
553 U
+= ( ( AVPicture
* )&frame
)->linesize
[ 1 ];
554 V
+= ( ( AVPicture
* )&frame
)->linesize
[ 2 ];
559 img_convert( output
, PIX_FMT_YUV422
, (AVPicture
*)&frame
, codec_context
->pix_fmt
, *width
, *height
);
560 memcpy( *buffer
, output
->data
[ 0 ], size
);
563 memcpy( image
, *buffer
, size
);
564 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
566 if ( current_time
== 0 && source_fps
!= 0 )
568 double fps
= mlt_properties_get_double( properties
, "fps" );
569 current_time
= ceil( source_fps
* ( double )position
/ fps
) * ( 1 / source_fps
);
570 mlt_properties_set_double( properties
, "current_time", current_time
);
574 mlt_properties_set_double( properties
, "current_time", current_time
);
579 // Set the field order property for this frame
580 mlt_properties_set_int( frame_properties
, "top_field_first",
581 mlt_properties_get_int( properties
, "top_field_first" ) );
583 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
584 mlt_properties_set_position( properties
, "video_expected", position
+ 1 );
589 /** Set up video handling.
592 static void producer_set_up_video( mlt_producer
this, mlt_frame frame
)
594 // Get the properties
595 mlt_properties properties
= mlt_producer_properties( this );
597 // Fetch the video_context
598 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
600 // Get the video_index
601 int index
= mlt_properties_get_int( properties
, "video_index" );
603 // Get the frame properties
604 mlt_properties frame_properties
= mlt_frame_properties( frame
);
606 if ( context
!= NULL
&& index
!= -1 )
608 // Get the video stream
609 AVStream
*stream
= context
->streams
[ index
];
612 AVCodecContext
*codec_context
= &stream
->codec
;
615 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
617 // Initialise the codec if necessary
621 codec
= avcodec_find_decoder( codec_context
->codec_id
);
623 // If we don't have a codec and we can't initialise it, we can't do much more...
624 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
626 // Now store the codec with its destructor
627 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
631 // Remember that we can't use this later
632 mlt_properties_set_int( properties
, "video_index", -1 );
636 // No codec, no show...
639 double aspect_ratio
= 1;
640 double source_fps
= 0;
643 if ( codec_context
->sample_aspect_ratio
.num
> 0 )
644 aspect_ratio
= av_q2d( codec_context
->sample_aspect_ratio
);
646 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
647 //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
650 source_fps
= ( double )codec_context
->frame_rate
/ ( codec_context
->frame_rate_base
== 0 ?
1 : codec_context
->frame_rate_base
);
652 // We'll use fps if it's available
653 if ( source_fps
> 0 && source_fps
< 30 )
654 mlt_properties_set_double( properties
, "source_fps", source_fps
);
656 // Set the width and height
657 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
658 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
660 mlt_frame_push_get_image( frame
, producer_get_image
);
661 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
665 mlt_properties_set_int( frame_properties
, "test_image", 1 );
670 mlt_properties_set_int( frame_properties
, "test_image", 1 );
674 /** Get the audio from a frame.
677 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
679 // Get the properties from the frame
680 mlt_properties frame_properties
= mlt_frame_properties( frame
);
682 // Obtain the frame number of this frame
683 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
686 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
688 // Get the producer properties
689 mlt_properties properties
= mlt_producer_properties( this );
691 // Fetch the audio_context
692 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
694 // Get the audio_index
695 int index
= mlt_properties_get_int( properties
, "audio_index" );
697 // Get the seekable status
698 int seekable
= mlt_properties_get_int( properties
, "seekable" );
700 // Obtain the expected frame numer
701 mlt_position expected
= mlt_properties_get_position( properties
, "audio_expected" );
703 // Obtain the resample context if it exists (not always needed)
704 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
706 // Obtain the audio buffer
707 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
709 // Get amount of audio used
710 int audio_used
= mlt_properties_get_int( properties
, "audio_used" );
712 // Calculate the real time code
713 double real_timecode
= producer_time_of_frame( this, position
);
715 // Get the audio stream
716 AVStream
*stream
= context
->streams
[ index
];
719 AVCodecContext
*codec_context
= &stream
->codec
;
724 // Number of frames to ignore (for ffwd)
727 // Flag for paused (silence)
730 // Check for resample and create if necessary
731 if ( resample
== NULL
&& codec_context
->channels
<= 2 )
733 // Create the resampler
734 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
736 // And store it on properties
737 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
739 else if ( resample
== NULL
)
741 *channels
= codec_context
->channels
;
742 *frequency
= codec_context
->sample_rate
;
745 // Check for audio buffer and create if necessary
746 if ( audio_buffer
== NULL
)
748 // Allocate the audio buffer
749 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
751 // And store it on properties for reuse
752 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
756 if ( position
!= expected
)
758 if ( position
+ 1 == expected
)
760 // We're paused - silence required
763 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
765 // Fast forward - seeking is inefficient for small distances - just ignore following frames
766 ignore
= position
- expected
;
770 // Set to the real timecode
771 if ( av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) + real_timecode
* 1000000.0 ) != 0 )
774 // Clear the usage in the audio buffer
779 // Get the audio if required
784 int16_t *temp
= mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
786 memset( &pkt
, 0, sizeof( pkt
) );
788 while( ret
>= 0 && !got_audio
)
790 // Check if the buffer already contains the samples required
791 if ( audio_used
>= *samples
&& ignore
== 0 )
798 ret
= av_read_frame( context
, &pkt
);
801 uint8_t *ptr
= pkt
.data
;
804 // We only deal with audio from the selected audio_index
805 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
808 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
821 if ( resample
!= NULL
)
823 audio_used
+= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
827 memcpy( &audio_buffer
[ audio_used
* *channels
], temp
, data_size
);
828 audio_used
+= data_size
/ ( codec_context
->channels
* sizeof( int16_t ) );
832 while ( ignore
&& audio_used
> *samples
)
835 audio_used
-= *samples
;
836 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
840 // If we're behind, ignore this packet
841 float current_pts
= (float)pkt
.pts
/ 1000000.0;
842 if ( seekable
&& ( !ignore
&& current_pts
<= ( real_timecode
- 0.02 ) ) )
846 // We're finished with this packet regardless
847 av_free_packet( &pkt
);
850 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
851 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
853 // Now handle the audio if we have enough
854 if ( audio_used
>= *samples
)
856 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
857 audio_used
-= *samples
;
858 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
862 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
865 // Store the number of audio samples still available
866 mlt_properties_set_int( properties
, "audio_used", audio_used
);
868 // Release the temporary audio
869 mlt_pool_release( temp
);
873 // Get silence and don't touch the context
874 frame
->get_audio
= NULL
;
875 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
878 // Regardless of speed (other than paused), we expect to get the next frame
880 mlt_properties_set_position( properties
, "audio_expected", position
+ 1 );
885 /** Set up audio handling.
888 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
890 // Get the properties
891 mlt_properties properties
= mlt_producer_properties( this );
893 // Fetch the audio_context
894 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
896 // Get the audio_index
897 int index
= mlt_properties_get_int( properties
, "audio_index" );
899 // Deal with audio context
900 if ( context
!= NULL
&& index
!= -1 )
902 // Get the frame properties
903 mlt_properties frame_properties
= mlt_frame_properties( frame
);
905 // Get the audio stream
906 AVStream
*stream
= context
->streams
[ index
];
909 AVCodecContext
*codec_context
= &stream
->codec
;
912 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
914 // Initialise the codec if necessary
918 codec
= avcodec_find_decoder( codec_context
->codec_id
);
920 // If we don't have a codec and we can't initialise it, we can't do much more...
921 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
923 // Now store the codec with its destructor
924 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
929 // Remember that we can't use this later
930 mlt_properties_set_int( properties
, "audio_index", -1 );
934 // No codec, no show...
937 frame
->get_audio
= producer_get_audio
;
938 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
943 /** Our get frame implementation.
946 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
948 // Create an empty frame
949 *frame
= mlt_frame_init( );
951 // Update timecode on the frame we're creating
952 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
954 // Set the position of this producer
955 mlt_properties_set_position( mlt_frame_properties( *frame
), "avformat_position", mlt_producer_position( this ) );
958 producer_set_up_video( this, *frame
);
961 producer_set_up_audio( this, *frame
);
963 // Set the aspect_ratio
964 mlt_properties_set_double( mlt_frame_properties( *frame
), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
966 // Calculate the next timecode
967 mlt_producer_prepare_next( this );