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 // AV option (0 = both, 1 = video, 2 = audio)
176 // Only if there is not a protocol specification that avformat can handle
177 if ( mrl
&& !url_exist( file
) )
179 // 'file' becomes format abbreviation
183 format
= av_find_input_format( file
);
185 // Eat the format designator
191 params
= calloc( sizeof( AVFormatParameters
), 1 );
193 // These are required by video4linux (defaults)
195 params
->height
= 480;
196 params
->frame_rate
= 25;
197 params
->frame_rate_base
= 1;
198 params
->device
= file
;
199 params
->channels
= 2;
200 params
->sample_rate
= 48000;
204 mrl
= strchr( file
, '?' );
208 char *name
= strdup( ++mrl
);
209 char *value
= strchr( name
, ':' );
214 char *t
= strchr( value
, '&' );
217 if ( !strcmp( name
, "frame_rate" ) )
218 params
->frame_rate
= atoi( value
);
219 else if ( !strcmp( name
, "frame_rate_base" ) )
220 params
->frame_rate_base
= atoi( value
);
221 else if ( !strcmp( name
, "sample_rate" ) )
222 params
->sample_rate
= atoi( value
);
223 else if ( !strcmp( name
, "channels" ) )
224 params
->channels
= atoi( value
);
225 else if ( !strcmp( name
, "width" ) )
226 params
->width
= atoi( value
);
227 else if ( !strcmp( name
, "height" ) )
228 params
->height
= atoi( value
);
229 else if ( !strcmp( name
, "standard" ) )
231 standard
= strdup( value
);
232 params
->standard
= standard
;
234 else if ( !strcmp( name
, "av" ) )
238 mrl
= strchr( mrl
, '&' );
242 // Now attempt to open the file
243 error
= av_open_input_file( &context
, file
, format
, 0, params
);
246 // Cleanup AVFormatParameters
250 // If successful, then try to get additional info
253 // Get the stream info
254 error
= av_find_stream_info( context
) < 0;
256 // Continue if no error
259 // We will default to the first audio and video streams found
260 int audio_index
= -1;
261 int video_index
= -1;
263 // Now set properties where we can (use default unknowns if required)
264 if ( context
->duration
!= AV_NOPTS_VALUE
)
266 // This isn't going to be accurate for all formats
267 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
);
268 mlt_properties_set_position( properties
, "out", frames
- 2 );
269 mlt_properties_set_position( properties
, "length", frames
- 1 );
272 // Find default audio and video streams
273 find_default_streams( context
, &audio_index
, &video_index
);
275 if ( context
->start_time
!= AV_NOPTS_VALUE
)
276 mlt_properties_set_double( properties
, "start_time", context
->start_time
);
278 // Check if we're seekable (something funny about mpeg here :-/)
279 if ( strcmp( file
, "pipe:" ) )
280 mlt_properties_set_int( properties
, "seekable", av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) ) >= 0 );
282 // Store selected audio and video indexes on properties
283 mlt_properties_set_int( properties
, "audio_index", audio_index
);
284 mlt_properties_set_int( properties
, "video_index", video_index
);
286 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
287 if ( av
== 0 && strcmp( file
, "pipe:" ) && audio_index
!= -1 && video_index
!= -1 )
289 // We'll use the open one as our video_context
290 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
292 // And open again for our audio context
293 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
294 av_find_stream_info( context
);
297 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
299 else if ( av
!= 2 && video_index
!= -1 )
301 // We only have a video context
302 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
304 else if ( audio_index
!= -1 )
306 // We only have an audio context
307 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
311 // Something has gone wrong
317 // Unlock the mutex now
323 /** Convert a frame position to a time code.
326 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
328 // Get the properties
329 mlt_properties properties
= mlt_producer_properties( this );
332 double fps
= mlt_properties_get_double( properties
, "fps" );
335 return ( double )position
/ fps
;
338 /** Get an image from a frame.
341 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
343 // Get the properties from the frame
344 mlt_properties frame_properties
= mlt_frame_properties( frame
);
346 // Obtain the frame number of this frame
347 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
350 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
352 // Get the producer properties
353 mlt_properties properties
= mlt_producer_properties( this );
355 // Fetch the video_context
356 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
358 // Get the video_index
359 int index
= mlt_properties_get_int( properties
, "video_index" );
361 // Obtain the expected frame numer
362 mlt_position expected
= mlt_properties_get_position( properties
, "video_expected" );
364 // Calculate the real time code
365 double real_timecode
= producer_time_of_frame( this, position
);
367 // Get the video stream
368 AVStream
*stream
= context
->streams
[ index
];
371 AVCodecContext
*codec_context
= &stream
->codec
;
376 // Get the conversion frame
377 AVPicture
*output
= mlt_properties_get_data( properties
, "video_output_frame", NULL
);
379 // Special case pause handling flag
382 // Special case ffwd handling
385 // Current time calcs
386 double current_time
= mlt_properties_get_double( properties
, "current_time" );
388 // We may want to use the source fps if available
389 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
391 // Get the seekable status
392 int seekable
= mlt_properties_get_int( properties
, "seekable" );
394 // Set the result arguments that we know here (only *buffer is now required)
395 *format
= mlt_image_yuv422
;
396 *width
= codec_context
->width
;
397 *height
= codec_context
->height
;
399 // Set this on the frame properties
400 mlt_properties_set_int( frame_properties
, "width", *width
);
401 mlt_properties_set_int( frame_properties
, "height", *height
);
403 // Construct an AVFrame for YUV422 conversion
404 if ( output
== NULL
)
406 int size
= avpicture_get_size( PIX_FMT_YUV422
, *width
, *height
+ 1 );
407 uint8_t *buf
= mlt_pool_alloc( size
);
408 output
= mlt_pool_alloc( sizeof( AVPicture
) );
409 avpicture_fill( output
, buf
, PIX_FMT_YUV422
, *width
, *height
);
410 mlt_properties_set_data( properties
, "video_output_frame", output
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
411 mlt_properties_set_data( properties
, "video_output_buffer", buf
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
415 if ( position
!= expected
)
417 if ( position
+ 1 == expected
)
419 // We're paused - use last image
422 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
424 // Fast forward - seeking is inefficient for small distances - just ignore following frames
425 ignore
= position
- expected
;
427 else if ( position
< expected
|| position
- expected
>= 12 )
429 // Set to the real timecode
430 av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) + real_timecode
* 1000000.0 );
432 // Remove the cached info relating to the previous position
433 mlt_properties_set_double( properties
, "current_time", real_timecode
);
434 mlt_properties_set_data( properties
, "current_image", NULL
, 0, NULL
, NULL
);
438 // Duplicate the last image if necessary
439 if ( mlt_properties_get_data( properties
, "current_image", NULL
) != NULL
&&
440 ( paused
|| mlt_properties_get_double( properties
, "current_time" ) >= real_timecode
) )
442 // Get current image and size
444 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
447 *buffer
= mlt_pool_alloc( size
);
448 memcpy( *buffer
, image
, size
);
450 // Set this on the frame properties
451 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
459 memset( &pkt
, 0, sizeof( pkt
) );
460 memset( &frame
, 0, sizeof( frame
) );
462 while( ret
>= 0 && !got_picture
)
465 ret
= av_read_frame( context
, &pkt
);
467 // We only deal with video from the selected video_index
468 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
471 ret
= avcodec_decode_video( codec_context
, &frame
, &got_picture
, pkt
.data
, pkt
.size
);
475 if ( pkt
.pts
!= AV_NOPTS_VALUE
)
476 current_time
= ( double )pkt
.pts
/ 1000000.0;
478 current_time
= real_timecode
;
481 if ( ( int )( current_time
* 100 ) < ( int )( real_timecode
* 100 ) - 7 )
486 else if ( current_time
>= real_timecode
)
488 //current_time = real_timecode;
491 else if ( ignore
-- )
495 mlt_properties_set_int( properties
, "top_field_first", frame
.top_field_first
);
499 // We're finished with this packet regardless
500 av_free_packet( &pkt
);
503 // Now handle the picture if we have one
506 // Get current image and size
508 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
510 if ( image
== NULL
|| size
!= *width
* *height
* 2 )
512 size
= *width
* ( *height
+ 1 ) * 2;
513 image
= mlt_pool_alloc( size
);
514 mlt_properties_set_data( properties
, "current_image", image
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
517 *buffer
= mlt_pool_alloc( size
);
519 // EXPERIMENTAL IMAGE NORMALISATIONS
520 if ( codec_context
->pix_fmt
== PIX_FMT_YUV420P
)
523 register int half
= *width
>> 1;
524 register uint8_t *Y
= ( ( AVPicture
* )&frame
)->data
[ 0 ];
525 register uint8_t *U
= ( ( AVPicture
* )&frame
)->data
[ 1 ];
526 register uint8_t *V
= ( ( AVPicture
* )&frame
)->data
[ 2 ];
527 register uint8_t *d
= *buffer
;
528 register uint8_t *y
, *u
, *v
;
545 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
558 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
559 U
+= ( ( AVPicture
* )&frame
)->linesize
[ 1 ];
560 V
+= ( ( AVPicture
* )&frame
)->linesize
[ 2 ];
565 img_convert( output
, PIX_FMT_YUV422
, (AVPicture
*)&frame
, codec_context
->pix_fmt
, *width
, *height
);
566 memcpy( *buffer
, output
->data
[ 0 ], size
);
569 memcpy( image
, *buffer
, size
);
570 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
572 if ( current_time
== 0 && source_fps
!= 0 )
574 double fps
= mlt_properties_get_double( properties
, "fps" );
575 current_time
= ceil( source_fps
* ( double )position
/ fps
) * ( 1 / source_fps
);
576 mlt_properties_set_double( properties
, "current_time", current_time
);
580 mlt_properties_set_double( properties
, "current_time", current_time
);
585 // Set the field order property for this frame
586 mlt_properties_set_int( frame_properties
, "top_field_first",
587 mlt_properties_get_int( properties
, "top_field_first" ) );
589 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
590 mlt_properties_set_position( properties
, "video_expected", position
+ 1 );
595 /** Set up video handling.
598 static void producer_set_up_video( mlt_producer
this, mlt_frame frame
)
600 // Get the properties
601 mlt_properties properties
= mlt_producer_properties( this );
603 // Fetch the video_context
604 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
606 // Get the video_index
607 int index
= mlt_properties_get_int( properties
, "video_index" );
609 // Get the frame properties
610 mlt_properties frame_properties
= mlt_frame_properties( frame
);
612 if ( context
!= NULL
&& index
!= -1 )
614 // Get the video stream
615 AVStream
*stream
= context
->streams
[ index
];
618 AVCodecContext
*codec_context
= &stream
->codec
;
621 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
623 // Initialise the codec if necessary
627 codec
= avcodec_find_decoder( codec_context
->codec_id
);
629 // If we don't have a codec and we can't initialise it, we can't do much more...
630 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
632 // Now store the codec with its destructor
633 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
637 // Remember that we can't use this later
638 mlt_properties_set_int( properties
, "video_index", -1 );
642 // No codec, no show...
645 double source_fps
= 0;
647 // XXX: We won't know the real aspect ratio until an image is decoded
648 // but we do need it now (to satisfy filter_resize) - take a guess based
650 if ( codec_context
->sample_aspect_ratio
.num
> 0 )
652 mlt_properties_set_double( properties
, "aspect_ratio", av_q2d( codec_context
->sample_aspect_ratio
) );
656 int is_pal
= mlt_properties_get_double( properties
, "fps" ) == 25.0;
657 mlt_properties_set_double( properties
, "aspect_ratio", is_pal ?
128.0/117.0 : 72.0/79.0 );
660 //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
663 source_fps
= ( double )codec_context
->frame_rate
/ ( codec_context
->frame_rate_base
== 0 ?
1 : codec_context
->frame_rate_base
);
665 // We'll use fps if it's available
666 if ( source_fps
> 0 && source_fps
< 30 )
667 mlt_properties_set_double( properties
, "source_fps", source_fps
);
669 // Set the width and height
670 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
671 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
673 mlt_frame_push_get_image( frame
, producer_get_image
);
674 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
678 mlt_properties_set_int( frame_properties
, "test_image", 1 );
683 mlt_properties_set_int( frame_properties
, "test_image", 1 );
687 /** Get the audio from a frame.
690 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
692 // Get the properties from the frame
693 mlt_properties frame_properties
= mlt_frame_properties( frame
);
695 // Obtain the frame number of this frame
696 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
699 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
701 // Get the producer properties
702 mlt_properties properties
= mlt_producer_properties( this );
704 // Fetch the audio_context
705 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
707 // Get the audio_index
708 int index
= mlt_properties_get_int( properties
, "audio_index" );
710 // Get the seekable status
711 int seekable
= mlt_properties_get_int( properties
, "seekable" );
713 // Obtain the expected frame numer
714 mlt_position expected
= mlt_properties_get_position( properties
, "audio_expected" );
716 // Obtain the resample context if it exists (not always needed)
717 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
719 // Obtain the audio buffer
720 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
722 // Get amount of audio used
723 int audio_used
= mlt_properties_get_int( properties
, "audio_used" );
725 // Calculate the real time code
726 double real_timecode
= producer_time_of_frame( this, position
);
728 // Get the audio stream
729 AVStream
*stream
= context
->streams
[ index
];
732 AVCodecContext
*codec_context
= &stream
->codec
;
737 // Number of frames to ignore (for ffwd)
740 // Flag for paused (silence)
743 // Check for resample and create if necessary
744 if ( resample
== NULL
&& codec_context
->channels
<= 2 )
746 // Create the resampler
747 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
749 // And store it on properties
750 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
752 else if ( resample
== NULL
)
754 *channels
= codec_context
->channels
;
755 *frequency
= codec_context
->sample_rate
;
758 // Check for audio buffer and create if necessary
759 if ( audio_buffer
== NULL
)
761 // Allocate the audio buffer
762 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
764 // And store it on properties for reuse
765 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
769 if ( position
!= expected
)
771 if ( position
+ 1 == expected
)
773 // We're paused - silence required
776 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
778 // Fast forward - seeking is inefficient for small distances - just ignore following frames
779 ignore
= position
- expected
;
781 else if ( position
< expected
|| position
- expected
>= 12 )
783 // Set to the real timecode
784 if ( av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "start_time" ) + real_timecode
* 1000000.0 ) != 0 )
787 // Clear the usage in the audio buffer
792 // Get the audio if required
797 int16_t *temp
= mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
799 memset( &pkt
, 0, sizeof( pkt
) );
801 while( ret
>= 0 && !got_audio
)
803 // Check if the buffer already contains the samples required
804 if ( audio_used
>= *samples
&& ignore
== 0 )
811 ret
= av_read_frame( context
, &pkt
);
814 uint8_t *ptr
= pkt
.data
;
817 // We only deal with audio from the selected audio_index
818 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
821 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
834 if ( resample
!= NULL
)
836 audio_used
+= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
840 memcpy( &audio_buffer
[ audio_used
* *channels
], temp
, data_size
);
841 audio_used
+= data_size
/ ( codec_context
->channels
* sizeof( int16_t ) );
845 while ( ignore
&& audio_used
> *samples
)
848 audio_used
-= *samples
;
849 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
853 // If we're behind, ignore this packet
854 float current_pts
= (float)pkt
.pts
/ 1000000.0;
855 if ( seekable
&& ( !ignore
&& current_pts
<= ( real_timecode
- 0.02 ) ) )
859 // We're finished with this packet regardless
860 av_free_packet( &pkt
);
863 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
864 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
866 // Now handle the audio if we have enough
867 if ( audio_used
>= *samples
)
869 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
870 audio_used
-= *samples
;
871 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
875 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
878 // Store the number of audio samples still available
879 mlt_properties_set_int( properties
, "audio_used", audio_used
);
881 // Release the temporary audio
882 mlt_pool_release( temp
);
886 // Get silence and don't touch the context
887 frame
->get_audio
= NULL
;
888 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
891 // Regardless of speed (other than paused), we expect to get the next frame
893 mlt_properties_set_position( properties
, "audio_expected", position
+ 1 );
898 /** Set up audio handling.
901 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
903 // Get the properties
904 mlt_properties properties
= mlt_producer_properties( this );
906 // Fetch the audio_context
907 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
909 // Get the audio_index
910 int index
= mlt_properties_get_int( properties
, "audio_index" );
912 // Deal with audio context
913 if ( context
!= NULL
&& index
!= -1 )
915 // Get the frame properties
916 mlt_properties frame_properties
= mlt_frame_properties( frame
);
918 // Get the audio stream
919 AVStream
*stream
= context
->streams
[ index
];
922 AVCodecContext
*codec_context
= &stream
->codec
;
925 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
927 // Initialise the codec if necessary
931 codec
= avcodec_find_decoder( codec_context
->codec_id
);
933 // If we don't have a codec and we can't initialise it, we can't do much more...
934 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
936 // Now store the codec with its destructor
937 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
942 // Remember that we can't use this later
943 mlt_properties_set_int( properties
, "audio_index", -1 );
947 // No codec, no show...
950 frame
->get_audio
= producer_get_audio
;
951 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
956 /** Our get frame implementation.
959 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
961 // Create an empty frame
962 *frame
= mlt_frame_init( );
964 // Update timecode on the frame we're creating
965 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
967 // Set the position of this producer
968 mlt_properties_set_position( mlt_frame_properties( *frame
), "avformat_position", mlt_producer_position( this ) );
971 producer_set_up_video( this, *frame
);
974 producer_set_up_audio( this, *frame
);
976 // Set the aspect_ratio
977 mlt_properties_set_double( mlt_frame_properties( *frame
), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
979 // Calculate the next timecode
980 mlt_producer_prepare_next( this );