2 * producer_avformat.c -- avformat producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library 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 GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, 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
33 // System header files
39 void avformat_lock( );
40 void avformat_unlock( );
42 // Forward references.
43 static int producer_open( mlt_producer
this, char *file
);
44 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
);
46 /** Constructor for libavformat.
49 mlt_producer
producer_avformat_init( char *file
)
51 mlt_producer
this = NULL
;
53 // Check that we have a non-NULL argument
56 // Construct the producer
57 this = calloc( 1, sizeof( struct mlt_producer_s
) );
60 if ( mlt_producer_init( this, NULL
) == 0 )
63 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
65 // Set the resource property (required for all producers)
66 mlt_properties_set( properties
, "resource", file
);
68 // Register our get_frame implementation
69 this->get_frame
= producer_get_frame
;
72 if ( producer_open( this, file
) != 0 )
75 mlt_producer_close( this );
84 /** Find the default streams.
87 static void find_default_streams( AVFormatContext
*context
, int *audio_index
, int *video_index
)
91 // Allow for multiple audio and video streams in the file and select first of each (if available)
92 for( i
= 0; i
< context
->nb_streams
; i
++ )
94 // Get the codec context
95 AVCodecContext
*codec_context
= context
->streams
[ i
]->codec
;
97 if ( avcodec_find_decoder( codec_context
->codec_id
) == NULL
)
100 // Determine the type and obtain the first index of each type
101 switch( codec_context
->codec_type
)
103 case CODEC_TYPE_VIDEO
:
104 if ( *video_index
< 0 )
107 case CODEC_TYPE_AUDIO
:
108 if ( *audio_index
< 0 )
117 /** Producer file destructor.
120 static void producer_file_close( void *context
)
122 if ( context
!= NULL
)
124 // Lock the mutex now
128 av_close_input_file( context
);
130 // Unlock the mutex now
135 /** Producer file destructor.
138 static void producer_codec_close( void *codec
)
142 // Lock the mutex now
146 avcodec_close( codec
);
148 // Unlock the mutex now
156 static int producer_open( mlt_producer
this, char *file
)
158 // Return an error code (0 == no error)
161 // Context for avformat
162 AVFormatContext
*context
= NULL
;
164 // Get the properties
165 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
167 // We will treat everything with the producer fps
168 double fps
= mlt_properties_get_double( properties
, "fps" );
170 // Lock the mutex now
173 // If "MRL", then create AVInputFormat
174 AVInputFormat
*format
= NULL
;
175 AVFormatParameters
*params
= NULL
;
176 char *standard
= NULL
;
177 char *mrl
= strchr( file
, ':' );
179 // AV option (0 = both, 1 = video, 2 = audio)
182 // Setting lowest log level
183 av_log_set_level( -1 );
185 // Only if there is not a protocol specification that avformat can handle
186 if ( mrl
&& !url_exist( file
) )
188 // 'file' becomes format abbreviation
192 format
= av_find_input_format( file
);
194 // Eat the format designator
200 params
= calloc( sizeof( AVFormatParameters
), 1 );
202 // These are required by video4linux (defaults)
204 params
->height
= 480;
205 params
->time_base
= (AVRational
){1,25};
206 params
->device
= file
;
207 params
->channels
= 2;
208 params
->sample_rate
= 48000;
212 mrl
= strchr( file
, '?' );
216 char *name
= strdup( ++mrl
);
217 char *value
= strchr( name
, ':' );
222 char *t
= strchr( value
, '&' );
225 if ( !strcmp( name
, "frame_rate" ) )
226 params
->time_base
.den
= atoi( value
);
227 else if ( !strcmp( name
, "frame_rate_base" ) )
228 params
->time_base
.num
= atoi( value
);
229 else if ( !strcmp( name
, "sample_rate" ) )
230 params
->sample_rate
= atoi( value
);
231 else if ( !strcmp( name
, "channels" ) )
232 params
->channels
= atoi( value
);
233 else if ( !strcmp( name
, "width" ) )
234 params
->width
= atoi( value
);
235 else if ( !strcmp( name
, "height" ) )
236 params
->height
= atoi( value
);
237 else if ( !strcmp( name
, "standard" ) )
239 standard
= strdup( value
);
240 params
->standard
= standard
;
242 else if ( !strcmp( name
, "av" ) )
246 mrl
= strchr( mrl
, '&' );
250 // Now attempt to open the file
251 error
= av_open_input_file( &context
, file
, format
, 0, params
) < 0;
253 // Cleanup AVFormatParameters
257 // If successful, then try to get additional info
260 // Get the stream info
261 error
= av_find_stream_info( context
) < 0;
263 // Continue if no error
266 // We will default to the first audio and video streams found
267 int audio_index
= -1;
268 int video_index
= -1;
271 // Now set properties where we can (use default unknowns if required)
272 if ( context
->duration
!= AV_NOPTS_VALUE
)
274 // This isn't going to be accurate for all formats
275 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
);
276 mlt_properties_set_position( properties
, "out", frames
- 2 );
277 mlt_properties_set_position( properties
, "length", frames
- 1 );
280 // Find default audio and video streams
281 find_default_streams( context
, &audio_index
, &video_index
);
283 if ( context
->start_time
!= AV_NOPTS_VALUE
)
284 mlt_properties_set_double( properties
, "_start_time", context
->start_time
);
286 // Check if we're seekable (something funny about mpeg here :-/)
287 if ( strcmp( file
, "pipe:" ) && strncmp( file
, "http://", 6 ) )
288 mlt_properties_set_int( properties
, "seekable", av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ), AVSEEK_FLAG_BACKWARD
) >= 0 );
292 // Store selected audio and video indexes on properties
293 mlt_properties_set_int( properties
, "audio_index", audio_index
);
294 mlt_properties_set_int( properties
, "video_index", video_index
);
295 mlt_properties_set_int( properties
, "_last_position", -1 );
297 // Fetch the width, height and aspect ratio
298 if ( video_index
!= -1 )
300 AVCodecContext
*codec_context
= context
->streams
[ video_index
]->codec
;
301 mlt_properties_set_int( properties
, "width", codec_context
->width
);
302 mlt_properties_set_int( properties
, "height", codec_context
->height
);
303 mlt_properties_set_double( properties
, "aspect_ratio", av_q2d( codec_context
->sample_aspect_ratio
) );
307 if (context
->title
!= NULL
)
308 mlt_properties_set(properties
, "meta.attr.title.markup", context
->title
);
309 if (context
->author
!= NULL
)
310 mlt_properties_set(properties
, "meta.attr.author.markup", context
->author
);
311 if (context
->copyright
!= NULL
)
312 mlt_properties_set(properties
, "meta.attr.copyright.markup", context
->copyright
);
313 if (context
->comment
!= NULL
)
314 mlt_properties_set(properties
, "meta.attr.comment.markup", context
->comment
);
315 if (context
->album
!= NULL
)
316 mlt_properties_set(properties
, "meta.attr.album.markup", context
->album
);
317 if (context
->year
!= 0)
318 mlt_properties_set_int(properties
, "meta.attr.year.markup", context
->year
);
319 if (context
->track
!= 0)
320 mlt_properties_set_int(properties
, "meta.attr.track.markup", context
->track
);
322 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
323 if ( av
== 0 && !av_bypass
&& audio_index
!= -1 && video_index
!= -1 )
325 // We'll use the open one as our video_context
326 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
327 av_seek_frame( context
, -1, 0, AVSEEK_FLAG_BACKWARD
);
329 // And open again for our audio context
330 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
331 av_find_stream_info( context
);
334 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
336 else if ( av
!= 2 && video_index
!= -1 )
338 // We only have a video context
339 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
340 av_seek_frame( context
, -1, 0, AVSEEK_FLAG_BACKWARD
);
342 else if ( audio_index
!= -1 )
344 // We only have an audio context
345 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
349 // Something has gone wrong
353 mlt_properties_set_int( properties
, "av_bypass", av_bypass
);
357 // Unlock the mutex now
363 /** Convert a frame position to a time code.
366 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
368 // Get the properties
369 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
372 double fps
= mlt_properties_get_double( properties
, "fps" );
375 return ( double )position
/ fps
;
378 static inline void convert_image( AVFrame
*frame
, uint8_t *buffer
, int pix_fmt
, mlt_image_format format
, int width
, int height
)
381 if ( format
== mlt_image_yuv420p
)
383 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
384 width
, height
, PIX_FMT_YUV420P
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
386 output
.data
[0] = buffer
;
387 output
.data
[1] = buffer
+ width
* height
;
388 output
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
389 output
.linesize
[0] = width
;
390 output
.linesize
[1] = width
>> 1;
391 output
.linesize
[2] = width
>> 1;
392 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
393 output
.data
, output
.linesize
);
394 sws_freeContext( context
);
396 else if ( format
== mlt_image_rgb24
)
398 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
399 width
, height
, PIX_FMT_RGB24
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
401 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
402 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
403 output
.data
, output
.linesize
);
404 sws_freeContext( context
);
408 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
409 width
, height
, PIX_FMT_YUYV422
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
411 avpicture_fill( &output
, buffer
, PIX_FMT_YUYV422
, width
, height
);
412 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
413 output
.data
, output
.linesize
);
414 sws_freeContext( context
);
417 if ( format
== mlt_image_yuv420p
)
420 pict
.data
[0] = buffer
;
421 pict
.data
[1] = buffer
+ width
* height
;
422 pict
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
423 pict
.linesize
[0] = width
;
424 pict
.linesize
[1] = width
>> 1;
425 pict
.linesize
[2] = width
>> 1;
426 img_convert( &pict
, PIX_FMT_YUV420P
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
428 else if ( format
== mlt_image_rgb24
)
431 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
432 img_convert( &output
, PIX_FMT_RGB24
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
437 avpicture_fill( &output
, buffer
, PIX_FMT_YUV422
, width
, height
);
438 img_convert( &output
, PIX_FMT_YUV422
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
443 /** Get an image from a frame.
446 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
448 // Get the properties from the frame
449 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
451 // Obtain the frame number of this frame
452 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
455 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
457 // Get the producer properties
458 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
460 // Fetch the video_context
461 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
463 // Get the video_index
464 int index
= mlt_properties_get_int( properties
, "video_index" );
466 // Obtain the expected frame numer
467 mlt_position expected
= mlt_properties_get_position( properties
, "_video_expected" );
469 // Calculate the real time code
470 double real_timecode
= producer_time_of_frame( this, position
);
472 // Get the video stream
473 AVStream
*stream
= context
->streams
[ index
];
476 AVCodecContext
*codec_context
= stream
->codec
;
481 // Get the conversion frame
482 AVFrame
*av_frame
= mlt_properties_get_data( properties
, "av_frame", NULL
);
484 // Special case pause handling flag
487 // Special case ffwd handling
490 // Current time calcs
491 int current_position
= mlt_properties_get_double( properties
, "_current_position" );
493 // We may want to use the source fps if available
494 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
495 double fps
= mlt_properties_get_double( properties
, "fps" );
497 // This is the physical frame position in the source
498 int req_position
= ( int )( position
/ fps
* source_fps
);
500 // Get the seekable status
501 int seekable
= mlt_properties_get_int( properties
, "seekable" );
503 // Generate the size in bytes
506 // Hopefully provide better support for streams...
507 int av_bypass
= mlt_properties_get_int( properties
, "av_bypass" );
509 // Determines if we have to decode all frames in a sequence
512 // Set the result arguments that we know here (only *buffer is now required)
513 *width
= codec_context
->width
;
514 *height
= codec_context
->height
;
518 case mlt_image_yuv420p
:
519 size
= *width
* 3 * ( *height
+ 1 ) / 2;
521 case mlt_image_rgb24
:
522 size
= *width
* ( *height
+ 1 ) * 3;
525 *format
= mlt_image_yuv422
;
526 size
= *width
* ( *height
+ 1 ) * 2;
530 // Set this on the frame properties
531 mlt_properties_set_int( frame_properties
, "width", *width
);
532 mlt_properties_set_int( frame_properties
, "height", *height
);
534 // Construct the output image
535 *buffer
= mlt_pool_alloc( size
);
537 // Temporary hack to improve intra frame only
538 must_decode
= strcmp( codec_context
->codec
->name
, "mjpeg" ) &&
539 strcmp( codec_context
->codec
->name
, "rawvideo" ) &&
540 strcmp( codec_context
->codec
->name
, "dvvideo" );
543 if ( position
!= expected
)
545 if ( av_frame
!= NULL
&& position
+ 1 == expected
)
547 // We're paused - use last image
550 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
552 // Fast forward - seeking is inefficient for small distances - just ignore following frames
553 ignore
= ( int )( ( position
- expected
) / fps
* source_fps
);
555 else if ( seekable
&& ( position
< expected
|| position
- expected
>= 12 ) )
557 // Calculate the timestamp for the requested frame
558 int64_t timestamp
= ( int64_t )( ( double )req_position
/ source_fps
* AV_TIME_BASE
);
559 if ( ( uint64_t )context
->start_time
!= AV_NOPTS_VALUE
)
560 timestamp
+= context
->start_time
;
562 timestamp
-= AV_TIME_BASE
;
566 // Set to the timestamp
567 av_seek_frame( context
, -1, timestamp
, AVSEEK_FLAG_BACKWARD
);
569 // Remove the cached info relating to the previous position
570 mlt_properties_set_int( properties
, "_current_position", -1 );
571 mlt_properties_set_int( properties
, "_last_position", -1 );
572 mlt_properties_set_data( properties
, "av_frame", NULL
, 0, NULL
, NULL
);
577 // Duplicate the last image if necessary (see comment on rawvideo below)
578 if ( av_frame
!= NULL
&& ( paused
|| mlt_properties_get_int( properties
, "_current_position" ) >= req_position
) && av_bypass
== 0 )
581 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
583 // Set this on the frame properties
584 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
590 int int_position
= 0;
592 av_init_packet( &pkt
);
594 // Construct an AVFrame for YUV422 conversion
595 if ( av_frame
== NULL
)
597 av_frame
= avcodec_alloc_frame( );
598 mlt_properties_set_data( properties
, "av_frame", av_frame
, 0, av_free
, NULL
);
601 while( ret
>= 0 && !got_picture
)
604 ret
= av_read_frame( context
, &pkt
);
606 // We only deal with video from the selected video_index
607 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
609 // Determine time code of the packet
610 int_position
= ( int )( av_q2d( stream
->time_base
) * pkt
.dts
* source_fps
);
611 if ( context
->start_time
!= AV_NOPTS_VALUE
)
612 int_position
-= ( int )( context
->start_time
* source_fps
/ AV_TIME_BASE
);
614 int last_position
= mlt_properties_get_int( properties
, "_last_position" );
615 if ( int_position
== last_position
)
616 int_position
= last_position
+ 1;
617 mlt_properties_set_int( properties
, "_last_position", int_position
);
620 if ( must_decode
|| int_position
>= req_position
)
621 ret
= avcodec_decode_video( codec_context
, av_frame
, &got_picture
, pkt
.data
, pkt
.size
);
626 if ( int_position
< req_position
)
631 else if ( int_position
>= req_position
)
635 else if ( ignore
-- )
642 // Now handle the picture if we have one
645 mlt_properties_set_int( frame_properties
, "progressive", !av_frame
->interlaced_frame
);
646 mlt_properties_set_int( frame_properties
, "top_field_first", av_frame
->top_field_first
);
647 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
648 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, (mlt_destructor
)mlt_pool_release
, NULL
);
649 mlt_properties_set_double( properties
, "_current_position", int_position
);
652 // We're finished with this packet regardless
653 av_free_packet( &pkt
);
657 // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
658 // above will break the pause behaviour - so we wipe the frame now
659 if ( !strcmp( codec_context
->codec
->name
, "rawvideo" ) )
660 mlt_properties_set_data( properties
, "av_frame", NULL
, 0, NULL
, NULL
);
662 // Set the field order property for this frame
663 mlt_properties_set_int( frame_properties
, "top_field_first", mlt_properties_get_int( properties
, "top_field_first" ) );
665 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
666 mlt_properties_set_position( properties
, "_video_expected", position
+ 1 );
671 /** Set up video handling.
674 static void producer_set_up_video( mlt_producer
this, mlt_frame frame
)
676 // Get the properties
677 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
679 // Fetch the video_context
680 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
682 // Get the video_index
683 int index
= mlt_properties_get_int( properties
, "video_index" );
685 // Get the frame properties
686 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
688 if ( context
!= NULL
&& index
!= -1 )
690 // Get the video stream
691 AVStream
*stream
= context
->streams
[ index
];
694 AVCodecContext
*codec_context
= stream
->codec
;
697 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
699 // Initialise the codec if necessary
703 codec
= avcodec_find_decoder( codec_context
->codec_id
);
705 // If we don't have a codec and we can't initialise it, we can't do much more...
706 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
708 // Now store the codec with its destructor
709 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
713 // Remember that we can't use this later
714 mlt_properties_set_int( properties
, "video_index", -1 );
718 // No codec, no show...
721 double source_fps
= 0;
722 int norm_aspect_ratio
= mlt_properties_get_int( properties
, "norm_aspect_ratio" );
723 double force_aspect_ratio
= mlt_properties_get_double( properties
, "force_aspect_ratio" );
726 // XXX: We won't know the real aspect ratio until an image is decoded
727 // but we do need it now (to satisfy filter_resize) - take a guess based
729 if ( force_aspect_ratio
> 0.0 )
731 aspect_ratio
= force_aspect_ratio
;
733 else if ( !norm_aspect_ratio
&& codec_context
->sample_aspect_ratio
.num
> 0 )
735 aspect_ratio
= av_q2d( codec_context
->sample_aspect_ratio
);
739 int is_pal
= mlt_properties_get_double( properties
, "fps" ) == 25.0;
740 aspect_ratio
= is_pal ?
59.0/54.0 : 10.0/11.0;
744 source_fps
= ( double )codec_context
->time_base
.den
/ ( codec_context
->time_base
.num
== 0 ?
1 : codec_context
->time_base
.num
);
746 // We'll use fps if it's available
747 if ( source_fps
> 0 && source_fps
< 30 )
748 mlt_properties_set_double( properties
, "source_fps", source_fps
);
750 mlt_properties_set_double( properties
, "source_fps", mlt_properties_get_double( properties
, "fps" ) );
751 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
753 // Set the width and height
754 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
755 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
756 mlt_properties_set_double( frame_properties
, "aspect_ratio", aspect_ratio
);
758 mlt_frame_push_get_image( frame
, producer_get_image
);
759 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
763 mlt_properties_set_int( frame_properties
, "test_image", 1 );
768 mlt_properties_set_int( frame_properties
, "test_image", 1 );
772 /** Get the audio from a frame.
775 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
777 // Get the properties from the frame
778 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
780 // Obtain the frame number of this frame
781 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
784 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
786 // Get the producer properties
787 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
789 // Fetch the audio_context
790 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
792 // Get the audio_index
793 int index
= mlt_properties_get_int( properties
, "audio_index" );
795 // Get the seekable status
796 int seekable
= mlt_properties_get_int( properties
, "seekable" );
798 // Obtain the expected frame numer
799 mlt_position expected
= mlt_properties_get_position( properties
, "_audio_expected" );
801 // Obtain the resample context if it exists (not always needed)
802 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
804 // Obtain the audio buffer
805 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
807 // Get amount of audio used
808 int audio_used
= mlt_properties_get_int( properties
, "_audio_used" );
810 // Calculate the real time code
811 double real_timecode
= producer_time_of_frame( this, position
);
813 // Get the audio stream
814 AVStream
*stream
= context
->streams
[ index
];
817 AVCodecContext
*codec_context
= stream
->codec
;
822 // Number of frames to ignore (for ffwd)
825 // Flag for paused (silence)
828 // Check for resample and create if necessary
829 if ( resample
== NULL
&& codec_context
->channels
<= 2 )
831 // Create the resampler
832 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
834 // And store it on properties
835 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
837 else if ( resample
== NULL
)
839 *channels
= codec_context
->channels
;
840 *frequency
= codec_context
->sample_rate
;
843 // Check for audio buffer and create if necessary
844 if ( audio_buffer
== NULL
)
846 // Allocate the audio buffer
847 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
849 // And store it on properties for reuse
850 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
854 if ( position
!= expected
)
856 if ( position
+ 1 == expected
)
858 // We're paused - silence required
861 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
863 // Fast forward - seeking is inefficient for small distances - just ignore following frames
864 ignore
= position
- expected
;
866 else if ( position
< expected
|| position
- expected
>= 12 )
868 // Set to the real timecode
869 if ( av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ) + real_timecode
* 1000000.0, AVSEEK_FLAG_BACKWARD
) != 0 )
872 // Clear the usage in the audio buffer
877 // Get the audio if required
882 int16_t *temp
= mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
884 av_init_packet( &pkt
);
886 while( ret
>= 0 && !got_audio
)
888 // Check if the buffer already contains the samples required
889 if ( audio_used
>= *samples
&& ignore
== 0 )
896 ret
= av_read_frame( context
, &pkt
);
899 uint8_t *ptr
= pkt
.data
;
902 // We only deal with audio from the selected audio_index
903 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
906 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
919 if ( resample
!= NULL
)
921 audio_used
+= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
925 memcpy( &audio_buffer
[ audio_used
* *channels
], temp
, data_size
);
926 audio_used
+= data_size
/ ( codec_context
->channels
* sizeof( int16_t ) );
930 while ( ignore
&& audio_used
> *samples
)
933 audio_used
-= *samples
;
934 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
938 // If we're behind, ignore this packet
939 float current_pts
= av_q2d( stream
->time_base
) * pkt
.pts
;
940 if ( seekable
&& ( !ignore
&& current_pts
<= ( real_timecode
- 0.02 ) ) )
944 // We're finished with this packet regardless
945 av_free_packet( &pkt
);
948 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
949 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
951 // Now handle the audio if we have enough
952 if ( audio_used
>= *samples
)
954 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
955 audio_used
-= *samples
;
956 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
960 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
963 // Store the number of audio samples still available
964 mlt_properties_set_int( properties
, "_audio_used", audio_used
);
966 // Release the temporary audio
967 mlt_pool_release( temp
);
971 // Get silence and don't touch the context
972 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
975 // Regardless of speed (other than paused), we expect to get the next frame
977 mlt_properties_set_position( properties
, "_audio_expected", position
+ 1 );
982 /** Set up audio handling.
985 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
987 // Get the properties
988 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
990 // Fetch the audio_context
991 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
993 // Get the audio_index
994 int index
= mlt_properties_get_int( properties
, "audio_index" );
996 // Deal with audio context
997 if ( context
!= NULL
&& index
!= -1 )
999 // Get the frame properties
1000 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
1002 // Get the audio stream
1003 AVStream
*stream
= context
->streams
[ index
];
1005 // Get codec context
1006 AVCodecContext
*codec_context
= stream
->codec
;
1009 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
1011 // Initialise the codec if necessary
1012 if ( codec
== NULL
)
1015 codec
= avcodec_find_decoder( codec_context
->codec_id
);
1017 // If we don't have a codec and we can't initialise it, we can't do much more...
1018 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
1020 // Now store the codec with its destructor
1021 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
1026 // Remember that we can't use this later
1027 mlt_properties_set_int( properties
, "audio_index", -1 );
1031 // No codec, no show...
1032 if ( codec
!= NULL
)
1034 mlt_frame_push_audio( frame
, producer_get_audio
);
1035 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
1036 mlt_properties_set_int( frame_properties
, "frequency", codec_context
->sample_rate
);
1037 mlt_properties_set_int( frame_properties
, "channels", codec_context
->channels
);
1042 /** Our get frame implementation.
1045 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
1047 // Create an empty frame
1048 *frame
= mlt_frame_init( );
1050 // Update timecode on the frame we're creating
1051 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
1053 // Set the position of this producer
1054 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame
), "avformat_position", mlt_producer_frame( this ) );
1057 producer_set_up_video( this, *frame
);
1060 producer_set_up_audio( this, *frame
);
1062 // Set the aspect_ratio
1063 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame
), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1065 // Calculate the next timecode
1066 mlt_producer_prepare_next( this );