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 // Setting lowest log level
177 av_log_set_level( -1 );
179 // Only if there is not a protocol specification that avformat can handle
180 if ( mrl && !url_exist( file ) )
182 // 'file' becomes format abbreviation
186 format = av_find_input_format( file );
188 // Eat the format designator
194 params = calloc( sizeof( AVFormatParameters ), 1 );
196 // These are required by video4linux (defaults)
198 params->height = 480;
199 params->time_base= (AVRational){1,25};
200 params->device = file;
201 params->channels = 2;
202 params->sample_rate = 48000;
206 mrl = strchr( file, '?' );
210 char *name = strdup( ++mrl );
211 char *value = strchr( name, ':' );
216 char *t = strchr( value, '&' );
219 if ( !strcmp( name, "frame_rate" ) )
220 params->time_base.den = atoi( value );
221 else if ( !strcmp( name, "frame_rate_base" ) )
222 params->time_base.num = atoi( value );
223 else if ( !strcmp( name, "sample_rate" ) )
224 params->sample_rate = atoi( value );
225 else if ( !strcmp( name, "channels" ) )
226 params->channels = atoi( value );
227 else if ( !strcmp( name, "width" ) )
228 params->width = atoi( value );
229 else if ( !strcmp( name, "height" ) )
230 params->height = atoi( value );
231 else if ( !strcmp( name, "standard" ) )
233 standard = strdup( value );
234 params->standard = standard;
236 else if ( !strcmp( name, "av" ) )
240 mrl = strchr( mrl, '&' );
244 // Now attempt to open the file
245 error = av_open_input_file( &context, file, format, 0, params );
248 // Cleanup AVFormatParameters
252 // If successful, then try to get additional info
255 // Get the stream info
256 error = av_find_stream_info( context ) < 0;
258 // Continue if no error
261 // We will default to the first audio and video streams found
262 int audio_index = -1;
263 int video_index = -1;
266 // Now set properties where we can (use default unknowns if required)
267 if ( context->duration != AV_NOPTS_VALUE )
269 // This isn't going to be accurate for all formats
270 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
271 mlt_properties_set_position( properties, "out", frames - 2 );
272 mlt_properties_set_position( properties, "length", frames - 1 );
275 // Find default audio and video streams
276 find_default_streams( context, &audio_index, &video_index );
278 if ( context->start_time != AV_NOPTS_VALUE )
279 mlt_properties_set_double( properties, "_start_time", context->start_time );
281 // Check if we're seekable (something funny about mpeg here :-/)
282 if ( strcmp( file, "pipe:" ) && strncmp( file, "http://", 6 ) )
283 mlt_properties_set_int( properties, "seekable", av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ), AVSEEK_FLAG_BACKWARD ) >= 0 );
287 // Store selected audio and video indexes on properties
288 mlt_properties_set_int( properties, "audio_index", audio_index );
289 mlt_properties_set_int( properties, "video_index", video_index );
291 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
292 if ( av == 0 && !av_bypass && audio_index != -1 && video_index != -1 )
294 // We'll use the open one as our video_context
295 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
297 // And open again for our audio context
298 av_open_input_file( &context, file, NULL, 0, NULL );
299 av_find_stream_info( context );
302 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
304 else if ( av != 2 && video_index != -1 )
306 // We only have a video context
307 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
309 else if ( audio_index != -1 )
311 // We only have an audio context
312 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
316 // Something has gone wrong
320 mlt_properties_set_int( properties, "av_bypass", av_bypass );
324 // Unlock the mutex now
330 /** Convert a frame position to a time code.
333 static double producer_time_of_frame( mlt_producer this, mlt_position position )
335 // Get the properties
336 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
339 double fps = mlt_properties_get_double( properties, "fps" );
342 return ( double )position / fps;
345 static inline void convert_image( AVFrame *frame, uint8_t *buffer, int pix_fmt, mlt_image_format format, int width, int height )
347 // EXPERIMENTAL IMAGE NORMALISATIONS
348 if ( pix_fmt == PIX_FMT_YUV420P && format == mlt_image_yuv422 )
351 register int half = width >> 1;
352 register uint8_t *Y = ( ( AVPicture * )frame )->data[ 0 ];
353 register uint8_t *U = ( ( AVPicture * )frame )->data[ 1 ];
354 register uint8_t *V = ( ( AVPicture * )frame )->data[ 2 ];
355 register uint8_t *d = buffer;
356 register uint8_t *y, *u, *v;
373 Y += ( ( AVPicture * )frame )->linesize[ 0 ];
386 Y += ( ( AVPicture * )frame )->linesize[ 0 ];
387 U += ( ( AVPicture * )frame )->linesize[ 1 ];
388 V += ( ( AVPicture * )frame )->linesize[ 2 ];
391 else if ( format == mlt_image_yuv420p )
394 pict.data[0] = buffer;
395 pict.data[1] = buffer + width * height;
396 pict.data[2] = buffer + ( 3 * width * height ) / 2;
397 pict.linesize[0] = width;
398 pict.linesize[1] = width >> 1;
399 pict.linesize[2] = width >> 1;
400 img_convert( &pict, PIX_FMT_YUV420P, (AVPicture *)frame, pix_fmt, width, height );
402 else if ( format == mlt_image_rgb24 )
405 avpicture_fill( &output, buffer, PIX_FMT_RGB24, width, height );
406 img_convert( &output, PIX_FMT_RGB24, (AVPicture *)frame, pix_fmt, width, height );
411 avpicture_fill( &output, buffer, PIX_FMT_YUV422, width, height );
412 img_convert( &output, PIX_FMT_YUV422, (AVPicture *)frame, pix_fmt, width, height );
416 /** Get an image from a frame.
419 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
421 // Get the properties from the frame
422 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
424 // Obtain the frame number of this frame
425 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
428 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
430 // Get the producer properties
431 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
433 // Fetch the video_context
434 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
436 // Get the video_index
437 int index = mlt_properties_get_int( properties, "video_index" );
439 // Obtain the expected frame numer
440 mlt_position expected = mlt_properties_get_position( properties, "_video_expected" );
442 // Calculate the real time code
443 double real_timecode = producer_time_of_frame( this, position );
445 // Get the video stream
446 AVStream *stream = context->streams[ index ];
449 AVCodecContext *codec_context = stream->codec;
454 // Get the conversion frame
455 AVFrame *av_frame = mlt_properties_get_data( properties, "av_frame", NULL );
457 // Special case pause handling flag
460 // Special case ffwd handling
463 // Current time calcs
464 double current_time = mlt_properties_get_double( properties, "_current_time" );
466 // We may want to use the source fps if available
467 double source_fps = mlt_properties_get_double( properties, "source_fps" );
469 // Get the seekable status
470 int seekable = mlt_properties_get_int( properties, "seekable" );
472 // Generate the size in bytes
475 // Hopefully provide better support for streams...
476 int av_bypass = mlt_properties_get_int( properties, "av_bypass" );
478 // Set the result arguments that we know here (only *buffer is now required)
479 *width = codec_context->width;
480 *height = codec_context->height;
484 case mlt_image_yuv420p:
485 size = *width * 3 * ( *height + 1 ) / 2;
487 case mlt_image_rgb24:
488 size = *width * ( *height + 1 ) * 3;
491 *format = mlt_image_yuv422;
492 size = *width * ( *height + 1 ) * 2;
496 // Set this on the frame properties
497 mlt_properties_set_int( frame_properties, "width", *width );
498 mlt_properties_set_int( frame_properties, "height", *height );
500 // Construct the output image
501 *buffer = mlt_pool_alloc( size );
504 if ( position != expected )
506 if ( position + 1 == expected )
508 // We're paused - use last image
511 else if ( !seekable && position > expected && ( position - expected ) < 250 )
513 // Fast forward - seeking is inefficient for small distances - just ignore following frames
514 ignore = position - expected;
516 else if ( seekable && ( position < expected || position - expected >= 12 ) )
518 // Set to the real timecode
519 av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD );
521 // Remove the cached info relating to the previous position
522 mlt_properties_set_double( properties, "_current_time", real_timecode );
524 mlt_properties_set_data( properties, "av_frame", NULL, 0, NULL, NULL );
529 // Duplicate the last image if necessary
530 if ( av_frame != NULL && ( paused || mlt_properties_get_double( properties, "_current_time" ) >= real_timecode ) &&
534 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
536 // Set this on the frame properties
537 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
545 // Temporary hack to improve intra frame only
546 if ( !strcmp( codec_context->codec->name, "mjpeg" ) )
549 memset( &pkt, 0, sizeof( pkt ) );
551 // Construct an AVFrame for YUV422 conversion
552 if ( av_frame == NULL )
554 av_frame = calloc( 1, sizeof( AVFrame ) );
555 mlt_properties_set_data( properties, "av_frame", av_frame, 0, free, NULL );
558 while( ret >= 0 && !got_picture )
561 ret = av_read_frame( context, &pkt );
563 // We only deal with video from the selected video_index
564 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
566 // Determine time code of the packet
567 if ( pkt.dts != AV_NOPTS_VALUE )
568 current_time = av_q2d( stream->time_base ) * pkt.dts;
570 current_time = real_timecode;
573 if ( must_decode || current_time >= real_timecode )
574 ret = avcodec_decode_video( codec_context, av_frame, &got_picture, pkt.data, pkt.size );
579 if ( ( int )( current_time * 100 ) < ( int )( real_timecode * 100 ) - 7 )
584 else if ( current_time >= real_timecode )
588 else if ( ignore -- )
592 mlt_properties_set_int( properties, "top_field_first", av_frame->top_field_first );
596 // We're finished with this packet regardless
597 av_free_packet( &pkt );
600 // Now handle the picture if we have one
603 convert_image( av_frame, *buffer, codec_context->pix_fmt, *format, *width, *height );
605 mlt_properties_set_data( frame_properties, "image", *buffer, size, (mlt_destructor)mlt_pool_release, NULL );
607 if ( current_time == 0 && source_fps != 0 )
609 double fps = mlt_properties_get_double( properties, "fps" );
610 current_time = ceil( source_fps * ( double )position / fps ) * ( 1 / source_fps );
611 mlt_properties_set_double( properties, "_current_time", current_time );
615 mlt_properties_set_double( properties, "_current_time", current_time );
620 // Set the field order property for this frame
621 mlt_properties_set_int( frame_properties, "top_field_first",
622 mlt_properties_get_int( properties, "top_field_first" ) );
624 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
625 mlt_properties_set_position( properties, "_video_expected", position + 1 );
630 /** Set up video handling.
633 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
635 // Get the properties
636 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
638 // Fetch the video_context
639 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
641 // Get the video_index
642 int index = mlt_properties_get_int( properties, "video_index" );
644 // Get the frame properties
645 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
647 if ( context != NULL && index != -1 )
649 // Get the video stream
650 AVStream *stream = context->streams[ index ];
653 AVCodecContext *codec_context = stream->codec;
656 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
658 // Initialise the codec if necessary
662 codec = avcodec_find_decoder( codec_context->codec_id );
664 // If we don't have a codec and we can't initialise it, we can't do much more...
665 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
667 // Now store the codec with its destructor
668 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
672 // Remember that we can't use this later
673 mlt_properties_set_int( properties, "video_index", -1 );
677 // No codec, no show...
680 double source_fps = 0;
681 int norm_aspect_ratio = mlt_properties_get_int( properties, "norm_aspect_ratio" );
683 // XXX: We won't know the real aspect ratio until an image is decoded
684 // but we do need it now (to satisfy filter_resize) - take a guess based
686 if ( !norm_aspect_ratio && codec_context->sample_aspect_ratio.num > 0 )
688 mlt_properties_set_double( properties, "aspect_ratio", av_q2d( codec_context->sample_aspect_ratio ) );
692 int is_pal = mlt_properties_get_double( properties, "fps" ) == 25.0;
693 mlt_properties_set_double( properties, "aspect_ratio", is_pal ? 59.0/54.0 : 10.0/11.0 );
697 source_fps = ( double )codec_context->time_base.den / ( codec_context->time_base.num == 0 ? 1 : codec_context->time_base.num );
699 // We'll use fps if it's available
700 if ( source_fps > 0 && source_fps < 30 )
701 mlt_properties_set_double( properties, "source_fps", source_fps );
703 // Set the width and height
704 mlt_properties_set_int( frame_properties, "width", codec_context->width );
705 mlt_properties_set_int( frame_properties, "height", codec_context->height );
707 mlt_frame_push_get_image( frame, producer_get_image );
708 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
712 mlt_properties_set_int( frame_properties, "test_image", 1 );
717 mlt_properties_set_int( frame_properties, "test_image", 1 );
721 /** Get the audio from a frame.
724 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
726 // Get the properties from the frame
727 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
729 // Obtain the frame number of this frame
730 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
733 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
735 // Get the producer properties
736 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
738 // Fetch the audio_context
739 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
741 // Get the audio_index
742 int index = mlt_properties_get_int( properties, "audio_index" );
744 // Get the seekable status
745 int seekable = mlt_properties_get_int( properties, "seekable" );
747 // Obtain the expected frame numer
748 mlt_position expected = mlt_properties_get_position( properties, "_audio_expected" );
750 // Obtain the resample context if it exists (not always needed)
751 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
753 // Obtain the audio buffer
754 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
756 // Get amount of audio used
757 int audio_used = mlt_properties_get_int( properties, "_audio_used" );
759 // Calculate the real time code
760 double real_timecode = producer_time_of_frame( this, position );
762 // Get the audio stream
763 AVStream *stream = context->streams[ index ];
766 AVCodecContext *codec_context = stream->codec;
771 // Number of frames to ignore (for ffwd)
774 // Flag for paused (silence)
777 // Check for resample and create if necessary
778 if ( resample == NULL && codec_context->channels <= 2 )
780 // Create the resampler
781 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
783 // And store it on properties
784 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
786 else if ( resample == NULL )
788 *channels = codec_context->channels;
789 *frequency = codec_context->sample_rate;
792 // Check for audio buffer and create if necessary
793 if ( audio_buffer == NULL )
795 // Allocate the audio buffer
796 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
798 // And store it on properties for reuse
799 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
803 if ( position != expected )
805 if ( position + 1 == expected )
807 // We're paused - silence required
810 else if ( !seekable && position > expected && ( position - expected ) < 250 )
812 // Fast forward - seeking is inefficient for small distances - just ignore following frames
813 ignore = position - expected;
815 else if ( position < expected || position - expected >= 12 )
817 // Set to the real timecode
818 if ( av_seek_frame( context, -1, mlt_properties_get_double( properties, "_start_time" ) + real_timecode * 1000000.0, AVSEEK_FLAG_BACKWARD ) != 0 )
821 // Clear the usage in the audio buffer
826 // Get the audio if required
831 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
833 memset( &pkt, 0, sizeof( pkt ) );
835 while( ret >= 0 && !got_audio )
837 // Check if the buffer already contains the samples required
838 if ( audio_used >= *samples && ignore == 0 )
845 ret = av_read_frame( context, &pkt );
848 uint8_t *ptr = pkt.data;
851 // We only deal with audio from the selected audio_index
852 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
855 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
868 if ( resample != NULL )
870 audio_used += audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
874 memcpy( &audio_buffer[ audio_used * *channels ], temp, data_size );
875 audio_used += data_size / ( codec_context->channels * sizeof( int16_t ) );
879 while ( ignore && audio_used > *samples )
882 audio_used -= *samples;
883 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
887 // If we're behind, ignore this packet
888 float current_pts = av_q2d( stream->time_base ) * pkt.pts;
889 if ( seekable && ( !ignore && current_pts <= ( real_timecode - 0.02 ) ) )
893 // We're finished with this packet regardless
894 av_free_packet( &pkt );
897 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
898 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
900 // Now handle the audio if we have enough
901 if ( audio_used >= *samples )
903 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
904 audio_used -= *samples;
905 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
909 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
912 // Store the number of audio samples still available
913 mlt_properties_set_int( properties, "_audio_used", audio_used );
915 // Release the temporary audio
916 mlt_pool_release( temp );
920 // Get silence and don't touch the context
921 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
924 // Regardless of speed (other than paused), we expect to get the next frame
926 mlt_properties_set_position( properties, "_audio_expected", position + 1 );
931 /** Set up audio handling.
934 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
936 // Get the properties
937 mlt_properties properties = MLT_PRODUCER_PROPERTIES( this );
939 // Fetch the audio_context
940 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
942 // Get the audio_index
943 int index = mlt_properties_get_int( properties, "audio_index" );
945 // Deal with audio context
946 if ( context != NULL && index != -1 )
948 // Get the frame properties
949 mlt_properties frame_properties = MLT_FRAME_PROPERTIES( frame );
951 // Get the audio stream
952 AVStream *stream = context->streams[ index ];
955 AVCodecContext *codec_context = stream->codec;
958 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
960 // Initialise the codec if necessary
964 codec = avcodec_find_decoder( codec_context->codec_id );
966 // If we don't have a codec and we can't initialise it, we can't do much more...
967 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
969 // Now store the codec with its destructor
970 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
975 // Remember that we can't use this later
976 mlt_properties_set_int( properties, "audio_index", -1 );
980 // No codec, no show...
983 mlt_frame_push_audio( frame, producer_get_audio );
984 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
989 /** Our get frame implementation.
992 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
994 // Create an empty frame
995 *frame = mlt_frame_init( );
997 // Update timecode on the frame we're creating
998 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
1000 // Set the position of this producer
1001 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame ), "avformat_position", mlt_producer_frame( this ) );
1004 producer_set_up_video( this, *frame );
1007 producer_set_up_audio( this, *frame );
1009 // Set the aspect_ratio
1010 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame ), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1012 // Calculate the next timecode
1013 mlt_producer_prepare_next( this );