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
28 #include <ffmpeg/avformat.h>
30 // System header files
36 // Forward references.
37 static int producer_open( mlt_producer
this, char *file
);
38 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
);
40 // A static flag used to determine if avformat has been initialised
41 static int avformat_initialised
= 0;
42 static pthread_mutex_t avformat_mutex
;
44 void *av_malloc( unsigned int size
)
46 return mlt_pool_alloc( size
);
49 void *av_realloc( void *ptr
, unsigned int size
)
51 return mlt_pool_realloc( ptr
, size
);
54 void av_free( void *ptr
)
56 return mlt_pool_release( ptr
);
59 /** Constructor for libavformat.
62 mlt_producer
producer_avformat_init( char *file
)
64 mlt_producer
this = NULL
;
66 // Check that we have a non-NULL argument
69 // Construct the producer
70 this = calloc( 1, sizeof( struct mlt_producer_s
) );
73 if ( mlt_producer_init( this, NULL
) == 0 )
76 mlt_properties properties
= mlt_producer_properties( this );
78 // Set the resource property (required for all producers)
79 mlt_properties_set( properties
, "resource", file
);
81 // TEST: audio sync tweaking
82 mlt_properties_set_double( properties
, "discrepancy", 1 );
84 // Register our get_frame implementation
85 this->get_frame
= producer_get_frame
;
87 // Initialise avformat if necessary
88 if ( avformat_initialised
== 0 )
90 avformat_initialised
= 1;
91 pthread_mutex_init( &avformat_mutex
, NULL
);
96 if ( producer_open( this, file
) != 0 )
99 mlt_producer_close( this );
108 /** Find the default streams.
111 static void find_default_streams( AVFormatContext
*context
, int *audio_index
, int *video_index
)
115 // Allow for multiple audio and video streams in the file and select first of each (if available)
116 for( i
= 0; i
< context
->nb_streams
; i
++ )
118 // Get the codec context
119 AVCodecContext
*codec_context
= &context
->streams
[ i
]->codec
;
121 // Determine the type and obtain the first index of each type
122 switch( codec_context
->codec_type
)
124 case CODEC_TYPE_VIDEO
:
125 if ( *video_index
< 0 )
128 case CODEC_TYPE_AUDIO
:
129 if ( *audio_index
< 0 )
138 /** Producer file destructor.
141 static void producer_file_close( void *context
)
143 if ( context
!= NULL
)
145 // Lock the mutex now
146 pthread_mutex_lock( &avformat_mutex
);
149 av_close_input_file( context
);
151 // Unlock the mutex now
152 pthread_mutex_unlock( &avformat_mutex
);
156 /** Producer file destructor.
159 static void producer_codec_close( void *codec
)
163 // Lock the mutex now
164 pthread_mutex_lock( &avformat_mutex
);
167 avcodec_close( codec
);
169 // Unlock the mutex now
170 pthread_mutex_unlock( &avformat_mutex
);
177 static int producer_open( mlt_producer
this, char *file
)
179 // Return an error code (0 == no error)
182 // Context for avformat
183 AVFormatContext
*context
= NULL
;
185 // Get the properties
186 mlt_properties properties
= mlt_producer_properties( this );
188 // We will treat everything with the producer fps
189 double fps
= mlt_properties_get_double( properties
, "fps" );
191 // Lock the mutex now
192 pthread_mutex_lock( &avformat_mutex
);
194 // If "MRL", then create AVInputFormat
195 AVInputFormat
*format
= NULL
;
196 AVFormatParameters
*params
= NULL
;
197 char *standard
= NULL
;
198 char *mrl
= strchr( file
, ':' );
200 // Only if there is not a protocol specification that avformat can handle
201 if ( mrl
&& !url_exist( file
) )
203 // 'file' becomes format abbreviation
207 format
= av_find_input_format( file
);
209 // Eat the format designator
215 params
= calloc( sizeof( AVFormatParameters
), 1 );
217 // These are required by video4linux (defaults)
219 params
->height
= 480;
220 params
->frame_rate
= 25;
221 params
->frame_rate_base
= 1;
222 params
->device
= file
;
223 params
->channels
= 2;
224 params
->sample_rate
= 48000;
228 mrl
= strchr( file
, '?' );
232 char *name
= strdup( ++mrl
);
233 char *value
= strchr( name
, '=' );
238 char *t
= strchr( value
, '&' );
241 if ( !strcmp( name
, "frame_rate" ) )
242 params
->frame_rate
= atoi( value
);
243 else if ( !strcmp( name
, "frame_rate_base" ) )
244 params
->frame_rate_base
= atoi( value
);
245 else if ( !strcmp( name
, "sample_rate" ) )
246 params
->sample_rate
= atoi( value
);
247 else if ( !strcmp( name
, "channels" ) )
248 params
->channels
= atoi( value
);
249 else if ( !strcmp( name
, "width" ) )
250 params
->width
= atoi( value
);
251 else if ( !strcmp( name
, "height" ) )
252 params
->height
= atoi( value
);
253 else if ( !strcmp( name
, "standard" ) )
255 standard
= strdup( value
);
256 params
->standard
= standard
;
260 mrl
= strchr( mrl
, '&' );
264 // Now attempt to open the file
265 error
= av_open_input_file( &context
, file
, format
, 0, params
);
268 // Cleanup AVFormatParameters
272 // If successful, then try to get additional info
275 // Get the stream info
276 error
= av_find_stream_info( context
) < 0;
278 // Continue if no error
281 // We will default to the first audio and video streams found
282 int audio_index
= -1;
283 int video_index
= -1;
285 // Now set properties where we can (use default unknowns if required)
286 if ( context
->duration
!= AV_NOPTS_VALUE
)
288 // This isn't going to be accurate for all formats
289 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
);
290 mlt_properties_set_position( properties
, "out", frames
- 2 );
291 mlt_properties_set_position( properties
, "length", frames
- 1 );
294 // Find default audio and video streams
295 find_default_streams( context
, &audio_index
, &video_index
);
297 // Store selected audio and video indexes on properties
298 mlt_properties_set_int( properties
, "audio_index", audio_index
);
299 mlt_properties_set_int( properties
, "video_index", video_index
);
301 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
302 if ( audio_index
!= -1 && video_index
!= -1 )
304 // We'll use the open one as our video_context
305 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
307 // And open again for our audio context
308 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
309 av_find_stream_info( context
);
312 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
314 else if ( video_index
!= -1 )
316 // We only have a video context
317 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
319 else if ( audio_index
!= -1 )
321 // We only have an audio context
322 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
326 // Something has gone wrong
332 // Unlock the mutex now
333 pthread_mutex_unlock( &avformat_mutex
);
338 /** Convert a frame position to a time code.
341 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
343 // Get the properties
344 mlt_properties properties
= mlt_producer_properties( this );
347 double fps
= mlt_properties_get_double( properties
, "fps" );
350 return ( double )position
/ fps
;
353 /** Get an image from a frame.
356 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
358 // Get the properties from the frame
359 mlt_properties frame_properties
= mlt_frame_properties( frame
);
361 // Obtain the frame number of this frame
362 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
365 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
367 // Get the producer properties
368 mlt_properties properties
= mlt_producer_properties( this );
370 // Fetch the video_context
371 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
373 // Get the video_index
374 int index
= mlt_properties_get_int( properties
, "video_index" );
376 // Obtain the expected frame numer
377 mlt_position expected
= mlt_properties_get_position( properties
, "video_expected" );
379 // Calculate the real time code
380 double real_timecode
= producer_time_of_frame( this, position
) + mlt_properties_get_double( properties
, "_v_pts_offset" );
382 // Get the video stream
383 AVStream
*stream
= context
->streams
[ index
];
386 AVCodecContext
*codec_context
= &stream
->codec
;
391 // Get the conversion frame
392 AVPicture
*output
= mlt_properties_get_data( properties
, "video_output_frame", NULL
);
394 // Special case pause handling flag
397 // Special case ffwd handling
400 // Current time calcs
401 double current_time
= mlt_properties_get_double( properties
, "current_time" );
403 // We may want to use the source fps if available
404 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
406 // Set the result arguments that we know here (only *buffer is now required)
407 *format
= mlt_image_yuv422
;
408 *width
= codec_context
->width
;
409 *height
= codec_context
->height
;
411 // Set this on the frame properties
412 mlt_properties_set_int( frame_properties
, "width", *width
);
413 mlt_properties_set_int( frame_properties
, "height", *height
);
415 // Lock the mutex now
416 pthread_mutex_lock( &avformat_mutex
);
418 // Construct an AVFrame for YUV422 conversion
419 if ( output
== NULL
)
421 int size
= avpicture_get_size( PIX_FMT_YUV422
, *width
, *height
);
423 uint8_t *buf
= mlt_pool_alloc( size
);
424 output
= mlt_pool_alloc( sizeof( AVPicture
) );
425 //memset( output, 0, sizeof( AVPicture ) );
426 avpicture_fill( output
, buf
, PIX_FMT_YUV422
, *width
, *height
);
427 mlt_properties_set_data( properties
, "video_output_frame", output
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
428 mlt_properties_set_data( properties
, "video_output_buffer", buf
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
432 if ( position
!= expected
)
434 if ( position
+ 1 == expected
)
436 // We're paused - use last image
439 else if ( position
> expected
&& ( position
- expected
) < 250 )
441 // Fast forward - seeking is inefficient for small distances - just ignore following frames
442 ignore
= position
- expected
;
446 // Set to the real timecode
447 av_seek_frame( context
, -1, real_timecode
* 1000000.0 );
449 // Remove the cached info relating to the previous position
450 mlt_properties_set_double( properties
, "current_time", real_timecode
);
451 mlt_properties_set_data( properties
, "current_image", NULL
, 0, NULL
, NULL
);
455 // Duplicate the last image if necessary
456 if ( mlt_properties_get_data( properties
, "current_image", NULL
) != NULL
&&
457 ( paused
|| mlt_properties_get_double( properties
, "current_time" ) >= real_timecode
) )
459 // Get current image and size
461 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
464 *buffer
= mlt_pool_alloc( size
);
465 memcpy( *buffer
, image
, size
);
467 // Set this on the frame properties
468 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
476 memset( &pkt
, 0, sizeof( pkt
) );
477 memset( &frame
, 0, sizeof( frame
) );
479 while( ret
>= 0 && !got_picture
)
482 ret
= av_read_frame( context
, &pkt
);
484 // We only deal with video from the selected video_index
485 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
488 ret
= avcodec_decode_video( codec_context
, &frame
, &got_picture
, pkt
.data
, pkt
.size
);
492 if ( pkt
.pts
!= AV_NOPTS_VALUE
&& pkt
.pts
!= 0 )
494 if ( current_time
== 0 )
496 mlt_properties_set_double( properties
, "_v_pts_offset", ( double )( pkt
.pts
/ 1000000 ) );
497 real_timecode
+= pkt
.pts
/ 1000000;
499 current_time
= ( double )pkt
.pts
/ 1000000.0;
502 current_time
= real_timecode
;
505 if ( current_time
< real_timecode
)
510 else if ( current_time
>= real_timecode
)
512 //current_time = real_timecode;
515 else if ( ignore
-- )
522 // We're finished with this packet regardless
523 av_free_packet( &pkt
);
526 // Now handle the picture if we have one
529 // Get current image and size
531 uint8_t *image
= mlt_properties_get_data( properties
, "current_image", &size
);
533 if ( image
== NULL
|| size
!= *width
* *height
* 2 )
535 size
= *width
* ( *height
+ 1 ) * 2;
536 image
= mlt_pool_alloc( size
);
537 mlt_properties_set_data( properties
, "current_image", image
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
540 *buffer
= mlt_pool_alloc( size
);
542 // EXPERIMENTAL IMAGE NORMALISATIONS
543 if ( codec_context
->pix_fmt
== PIX_FMT_YUV420P
)
546 register int half
= *width
>> 1;
547 register uint8_t *Y
= ( ( AVPicture
* )&frame
)->data
[ 0 ];
548 register uint8_t *U
= ( ( AVPicture
* )&frame
)->data
[ 1 ];
549 register uint8_t *V
= ( ( AVPicture
* )&frame
)->data
[ 2 ];
550 register uint8_t *d
= *buffer
;
551 register uint8_t *y
, *u
, *v
;
568 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
581 Y
+= ( ( AVPicture
* )&frame
)->linesize
[ 0 ];
582 U
+= ( ( AVPicture
* )&frame
)->linesize
[ 1 ];
583 V
+= ( ( AVPicture
* )&frame
)->linesize
[ 2 ];
588 img_convert( output
, PIX_FMT_YUV422
, (AVPicture
*)&frame
, codec_context
->pix_fmt
, *width
, *height
);
589 memcpy( *buffer
, output
->data
[ 0 ], size
);
592 memcpy( image
, *buffer
, size
);
593 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
595 if ( current_time
== 0 && source_fps
!= 0 )
597 double fps
= mlt_properties_get_double( properties
, "fps" );
598 current_time
= ceil( source_fps
* ( double )position
/ fps
) * ( 1 / source_fps
);
599 mlt_properties_set_double( properties
, "current_time", current_time
);
603 mlt_properties_set_double( properties
, "current_time", current_time
);
608 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
609 mlt_properties_set_position( properties
, "video_expected", position
+ 1 );
611 // Unlock the mutex now
612 pthread_mutex_unlock( &avformat_mutex
);
617 /** Set up video handling.
620 static void producer_set_up_video( mlt_producer
this, mlt_frame frame
)
622 // Get the properties
623 mlt_properties properties
= mlt_producer_properties( this );
625 // Fetch the video_context
626 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
628 // Get the video_index
629 int index
= mlt_properties_get_int( properties
, "video_index" );
631 // Get the frame properties
632 mlt_properties frame_properties
= mlt_frame_properties( frame
);
634 // Lock the mutex now
635 pthread_mutex_lock( &avformat_mutex
);
637 if ( context
!= NULL
&& index
!= -1 )
639 // Get the video stream
640 AVStream
*stream
= context
->streams
[ index
];
643 AVCodecContext
*codec_context
= &stream
->codec
;
646 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
648 // Initialise the codec if necessary
652 codec
= avcodec_find_decoder( codec_context
->codec_id
);
654 // If we don't have a codec and we can't initialise it, we can't do much more...
655 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
657 // Now store the codec with its destructor
658 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
662 // Remember that we can't use this later
663 mlt_properties_set_int( properties
, "video_index", -1 );
667 // No codec, no show...
670 double aspect_ratio
= 1;
671 double source_fps
= 0;
674 if ( codec_context
->sample_aspect_ratio
.num
> 0 )
675 aspect_ratio
= av_q2d( codec_context
->sample_aspect_ratio
);
677 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
678 //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
681 source_fps
= ( double )codec_context
->frame_rate
/ ( codec_context
->frame_rate_base
== 0 ?
1 : codec_context
->frame_rate_base
);
683 // We'll use fps if it's available
684 if ( source_fps
> 0 && source_fps
< 30 )
685 mlt_properties_set_double( properties
, "source_fps", source_fps
);
687 // Set the width and height
688 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
689 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
691 mlt_frame_push_get_image( frame
, producer_get_image
);
692 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
696 mlt_properties_set_int( frame_properties
, "test_image", 1 );
701 mlt_properties_set_int( frame_properties
, "test_image", 1 );
704 // Unlock the mutex now
705 pthread_mutex_unlock( &avformat_mutex
);
708 /** Get the audio from a frame.
711 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
713 // Get the properties from the frame
714 mlt_properties frame_properties
= mlt_frame_properties( frame
);
716 // Obtain the frame number of this frame
717 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
720 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
722 // Get the producer properties
723 mlt_properties properties
= mlt_producer_properties( this );
725 // Fetch the audio_context
726 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
728 // Get the audio_index
729 int index
= mlt_properties_get_int( properties
, "audio_index" );
731 // Obtain the expected frame numer
732 mlt_position expected
= mlt_properties_get_position( properties
, "audio_expected" );
734 // Obtain the resample context if it exists (not always needed)
735 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
737 // Obtain the audio buffer
738 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
740 // Get amount of audio used
741 int audio_used
= mlt_properties_get_int( properties
, "audio_used" );
743 // Calculate the real time code
744 double real_timecode
= producer_time_of_frame( this, position
);
746 // Get the audio stream
747 AVStream
*stream
= context
->streams
[ index
];
750 AVCodecContext
*codec_context
= &stream
->codec
;
755 // Number of frames to ignore (for ffwd)
758 // Flag for paused (silence)
762 // Lock the mutex now
763 pthread_mutex_lock( &avformat_mutex
);
765 // Check for resample and create if necessary
766 if ( resample
== NULL
)
768 // Create the resampler
769 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
771 // And store it on properties
772 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
775 // Check for audio buffer and create if necessary
776 if ( audio_buffer
== NULL
)
778 // Allocate the audio buffer
779 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
781 // And store it on properties for reuse
782 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
786 if ( position
!= expected
)
788 if ( position
+ 1 == expected
)
790 // We're paused - silence required
793 else if ( position
> expected
&& ( position
- expected
) < 250 )
795 // Fast forward - seeking is inefficient for small distances - just ignore following frames
796 ignore
= position
- expected
;
800 // Set to the real timecode
801 av_seek_frame( context
, -1, real_timecode
* 1000000.0 );
803 // Clear the usage in the audio buffer
810 // Get the audio if required
815 int16_t *temp
= mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
817 memset( &pkt
, 0, sizeof( pkt
) );
819 while( ret
>= 0 && !got_audio
)
821 // Check if the buffer already contains the samples required
822 if ( audio_used
>= *samples
&& ignore
== 0 )
829 ret
= av_read_frame( context
, &pkt
);
832 uint8_t *ptr
= pkt
.data
;
835 // We only deal with video from the selected video_index
836 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
839 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
852 int size_out
= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
854 audio_used
+= size_out
;
857 while ( ignore
&& audio_used
> *samples
)
860 audio_used
-= *samples
;
861 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
865 // If we're behind, ignore this packet
866 float current_pts
= (float)pkt
.pts
/ 1000000.0;
867 double discrepancy
= mlt_properties_get_double( properties
, "discrepancy" );
868 if ( current_pts
!= 0 && real_timecode
!= 0 )
870 if ( discrepancy
!= 1 )
871 discrepancy
= ( discrepancy
+ ( real_timecode
/ current_pts
) ) / 2;
873 discrepancy
= real_timecode
/ current_pts
;
874 if ( discrepancy
> 0.9 && discrepancy
< 1.1 )
877 discrepancy
= floor( discrepancy
+ 0.5 );
879 if ( discrepancy
== 0 )
882 mlt_properties_set_double( properties
, "discrepancy", discrepancy
);
885 if ( !ignore
&& discrepancy
* current_pts
<= ( real_timecode
- 0.02 ) )
889 // We're finished with this packet regardless
890 av_free_packet( &pkt
);
893 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
894 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
896 // Now handle the audio if we have enough
897 if ( audio_used
>= *samples
)
899 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
900 audio_used
-= *samples
;
901 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
905 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
908 // Store the number of audio samples still available
909 mlt_properties_set_int( properties
, "audio_used", audio_used
);
911 // Release the temporary audio
912 mlt_pool_release( temp
);
916 // Get silence and don't touch the context
917 frame
->get_audio
= NULL
;
918 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
921 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
922 mlt_properties_set_position( properties
, "audio_expected", position
+ 1 );
924 // Unlock the mutex now
925 pthread_mutex_unlock( &avformat_mutex
);
930 /** Set up audio handling.
933 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
935 // Get the properties
936 mlt_properties properties
= mlt_producer_properties( this );
938 // Fetch the audio_context
939 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
941 // Get the audio_index
942 int index
= mlt_properties_get_int( properties
, "audio_index" );
944 // Lock the mutex now
945 pthread_mutex_lock( &avformat_mutex
);
947 // Deal with audio context
948 if ( context
!= NULL
&& index
!= -1 )
950 // Get the frame properties
951 mlt_properties frame_properties
= mlt_frame_properties( frame
);
953 // Get the audio stream
954 AVStream
*stream
= context
->streams
[ index
];
957 AVCodecContext
*codec_context
= &stream
->codec
;
960 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
962 // Initialise the codec if necessary
966 codec
= avcodec_find_decoder( codec_context
->codec_id
);
968 // If we don't have a codec and we can't initialise it, we can't do much more...
969 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
971 // Now store the codec with its destructor
972 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
977 // Remember that we can't use this later
978 mlt_properties_set_int( properties
, "audio_index", -1 );
982 // No codec, no show...
985 frame
->get_audio
= producer_get_audio
;
986 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
990 // Unlock the mutex now
991 pthread_mutex_unlock( &avformat_mutex
);
994 /** Our get frame implementation.
997 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
999 // Create an empty frame
1000 *frame
= mlt_frame_init( );
1002 // Update timecode on the frame we're creating
1003 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
1005 // Set the position of this producer
1006 mlt_properties_set_position( mlt_frame_properties( *frame
), "avformat_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
1009 producer_set_up_video( this, *frame
);
1012 producer_set_up_audio( this, *frame
);
1014 // Set the aspect_ratio
1015 mlt_properties_set_double( mlt_frame_properties( *frame
), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
1017 // Calculate the next timecode
1018 mlt_producer_prepare_next( this );