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 // Now attempt to open the file
195 error = av_open_input_file( &context, file, NULL, 0, NULL );
198 // If successful, then try to get additional info
201 // Get the stream info
202 error = av_find_stream_info( context ) < 0;
204 // Continue if no error
207 // We will default to the first audio and video streams found
208 int audio_index = -1;
209 int video_index = -1;
211 // Now set properties where we can (use default unknowns if required)
212 if ( context->duration != AV_NOPTS_VALUE )
214 // This isn't going to be accurate for all formats
215 mlt_position frames = ( mlt_position )( ( ( double )context->duration / ( double )AV_TIME_BASE ) * fps );
216 mlt_properties_set_position( properties, "out", frames - 2 );
217 mlt_properties_set_position( properties, "length", frames - 1 );
220 // Find default audio and video streams
221 find_default_streams( context, &audio_index, &video_index );
223 // Store selected audio and video indexes on properties
224 mlt_properties_set_int( properties, "audio_index", audio_index );
225 mlt_properties_set_int( properties, "video_index", video_index );
227 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
228 if ( audio_index != -1 && video_index != -1 )
230 // We'll use the open one as our video_context
231 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
233 // And open again for our audio context
234 av_open_input_file( &context, file, NULL, 0, NULL );
235 av_find_stream_info( context );
238 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
240 else if ( video_index != -1 )
242 // We only have a video context
243 mlt_properties_set_data( properties, "video_context", context, 0, producer_file_close, NULL );
245 else if ( audio_index != -1 )
247 // We only have an audio context
248 mlt_properties_set_data( properties, "audio_context", context, 0, producer_file_close, NULL );
252 // Something has gone wrong
258 // Unlock the mutex now
259 pthread_mutex_unlock( &avformat_mutex );
264 /** Convert a frame position to a time code.
267 static double producer_time_of_frame( mlt_producer this, mlt_position position )
269 // Get the properties
270 mlt_properties properties = mlt_producer_properties( this );
273 double fps = mlt_properties_get_double( properties, "fps" );
276 return ( double )position / fps;
279 /** Get an image from a frame.
282 static int producer_get_image( mlt_frame frame, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
284 // Get the properties from the frame
285 mlt_properties frame_properties = mlt_frame_properties( frame );
287 // Obtain the frame number of this frame
288 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
291 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
293 // Get the producer properties
294 mlt_properties properties = mlt_producer_properties( this );
296 // Fetch the video_context
297 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
299 // Get the video_index
300 int index = mlt_properties_get_int( properties, "video_index" );
302 // Obtain the expected frame numer
303 mlt_position expected = mlt_properties_get_position( properties, "video_expected" );
305 // Calculate the real time code
306 double real_timecode = producer_time_of_frame( this, position );
308 // Get the video stream
309 AVStream *stream = context->streams[ index ];
312 AVCodecContext *codec_context = &stream->codec;
317 // Get the conversion frame
318 AVPicture *output = mlt_properties_get_data( properties, "video_output_frame", NULL );
320 // Special case pause handling flag
323 // Special case ffwd handling
326 // Current time calcs
327 double current_time = mlt_properties_get_double( properties, "current_time" );
329 // We may want to use the source fps if available
330 double source_fps = mlt_properties_get_double( properties, "source_fps" );
332 // Set the result arguments that we know here (only *buffer is now required)
333 *format = mlt_image_yuv422;
334 *width = codec_context->width;
335 *height = codec_context->height;
337 // Set this on the frame properties
338 mlt_properties_set_int( frame_properties, "width", *width );
339 mlt_properties_set_int( frame_properties, "height", *height );
341 // Lock the mutex now
342 pthread_mutex_lock( &avformat_mutex );
344 // Construct an AVFrame for YUV422 conversion
345 if ( output == NULL )
347 int size = avpicture_get_size( PIX_FMT_YUV422, *width, *height );
349 uint8_t *buf = mlt_pool_alloc( size );
350 output = mlt_pool_alloc( sizeof( AVPicture ) );
351 //memset( output, 0, sizeof( AVPicture ) );
352 avpicture_fill( output, buf, PIX_FMT_YUV422, *width, *height );
353 mlt_properties_set_data( properties, "video_output_frame", output, 0, ( mlt_destructor )mlt_pool_release, NULL );
354 mlt_properties_set_data( properties, "video_output_buffer", buf, 0, ( mlt_destructor )mlt_pool_release, NULL );
358 if ( position != expected )
360 if ( position + 1 == expected )
362 // We're paused - use last image
365 else if ( position > expected && ( position - expected ) < 250 )
367 // Fast forward - seeking is inefficient for small distances - just ignore following frames
368 ignore = position - expected;
372 // Set to the real timecode
373 av_seek_frame( context, -1, real_timecode * 1000000.0 );
375 // Remove the cached info relating to the previous position
376 mlt_properties_set_double( properties, "current_time", real_timecode );
377 mlt_properties_set_data( properties, "current_image", NULL, 0, NULL, NULL );
381 // Duplicate the last image if necessary
382 if ( mlt_properties_get_data( properties, "current_image", NULL ) != NULL &&
383 ( paused || mlt_properties_get_double( properties, "current_time" ) >= real_timecode ) )
385 // Get current image and size
387 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
390 *buffer = mlt_pool_alloc( size );
391 memcpy( *buffer, image, size );
393 // Set this on the frame properties
394 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
402 memset( &pkt, 0, sizeof( pkt ) );
403 memset( &frame, 0, sizeof( frame ) );
405 while( ret >= 0 && !got_picture )
408 ret = av_read_frame( context, &pkt );
410 // We only deal with video from the selected video_index
411 if ( ret >= 0 && pkt.stream_index == index && pkt.size > 0 )
414 ret = avcodec_decode_video( codec_context, &frame, &got_picture, pkt.data, pkt.size );
418 if ( pkt.pts != AV_NOPTS_VALUE && pkt.pts != 0 )
419 current_time = ( double )pkt.pts / 1000000.0;
421 current_time = real_timecode;
424 if ( current_time < real_timecode )
429 else if ( current_time >= real_timecode )
431 //current_time = real_timecode;
434 else if ( ignore -- )
441 // We're finished with this packet regardless
442 av_free_packet( &pkt );
445 // Now handle the picture if we have one
448 // Get current image and size
450 uint8_t *image = mlt_properties_get_data( properties, "current_image", &size );
452 if ( image == NULL || size != *width * *height * 2 )
454 size = *width * ( *height + 1 ) * 2;
455 image = mlt_pool_alloc( size );
456 mlt_properties_set_data( properties, "current_image", image, size, ( mlt_destructor )mlt_pool_release, NULL );
459 *buffer = mlt_pool_alloc( size );
461 // EXPERIMENTAL IMAGE NORMALISATIONS
462 if ( codec_context->pix_fmt == PIX_FMT_YUV420P )
465 register int half = *width >> 1;
466 register uint8_t *Y = ( ( AVPicture * )&frame )->data[ 0 ];
467 register uint8_t *U = ( ( AVPicture * )&frame )->data[ 1 ];
468 register uint8_t *V = ( ( AVPicture * )&frame )->data[ 2 ];
469 register uint8_t *d = *buffer;
470 register uint8_t *y, *u, *v;
487 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
500 Y += ( ( AVPicture * )&frame )->linesize[ 0 ];
501 U += ( ( AVPicture * )&frame )->linesize[ 1 ];
502 V += ( ( AVPicture * )&frame )->linesize[ 2 ];
507 img_convert( output, PIX_FMT_YUV422, (AVPicture *)&frame, codec_context->pix_fmt, *width, *height );
508 memcpy( *buffer, output->data[ 0 ], size );
511 memcpy( image, *buffer, size );
512 mlt_properties_set_data( frame_properties, "image", *buffer, size, ( mlt_destructor )mlt_pool_release, NULL );
514 if ( current_time == 0 && source_fps != 0 )
516 double fps = mlt_properties_get_double( properties, "fps" );
517 current_time = ceil( source_fps * ( double )position / fps ) * ( 1 / source_fps );
518 mlt_properties_set_double( properties, "current_time", current_time );
522 mlt_properties_set_double( properties, "current_time", current_time );
527 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
528 mlt_properties_set_position( properties, "video_expected", position + 1 );
530 // Unlock the mutex now
531 pthread_mutex_unlock( &avformat_mutex );
536 /** Set up video handling.
539 static void producer_set_up_video( mlt_producer this, mlt_frame frame )
541 // Get the properties
542 mlt_properties properties = mlt_producer_properties( this );
544 // Fetch the video_context
545 AVFormatContext *context = mlt_properties_get_data( properties, "video_context", NULL );
547 // Get the video_index
548 int index = mlt_properties_get_int( properties, "video_index" );
550 // Get the frame properties
551 mlt_properties frame_properties = mlt_frame_properties( frame );
553 // Lock the mutex now
554 pthread_mutex_lock( &avformat_mutex );
556 if ( context != NULL && index != -1 )
558 // Get the video stream
559 AVStream *stream = context->streams[ index ];
562 AVCodecContext *codec_context = &stream->codec;
565 AVCodec *codec = mlt_properties_get_data( properties, "video_codec", NULL );
567 // Initialise the codec if necessary
571 codec = avcodec_find_decoder( codec_context->codec_id );
573 // If we don't have a codec and we can't initialise it, we can't do much more...
574 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
576 // Now store the codec with its destructor
577 mlt_properties_set_data( properties, "video_codec", codec_context, 0, producer_codec_close, NULL );
581 // Remember that we can't use this later
582 mlt_properties_set_int( properties, "video_index", -1 );
586 // No codec, no show...
589 double aspect_ratio = 1;
590 double source_fps = 0;
593 if ( codec_context->sample_aspect_ratio.num > 0 )
594 aspect_ratio = av_q2d( codec_context->sample_aspect_ratio );
596 mlt_properties_set_double( properties, "aspect_ratio", aspect_ratio );
597 //fprintf( stderr, "AVFORMAT: sample aspect %f %dx%d\n", av_q2d( codec_context->sample_aspect_ratio ), codec_context->width, codec_context->height );
600 source_fps = ( double )codec_context->frame_rate / codec_context->frame_rate_base;
602 // We'll use fps if it's available
603 if ( source_fps > 0 && source_fps < 30 )
604 mlt_properties_set_double( properties, "source_fps", source_fps );
606 // Set the width and height
607 mlt_properties_set_int( frame_properties, "width", codec_context->width );
608 mlt_properties_set_int( frame_properties, "height", codec_context->height );
610 mlt_frame_push_get_image( frame, producer_get_image );
611 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
615 mlt_properties_set_int( frame_properties, "test_image", 1 );
620 mlt_properties_set_int( frame_properties, "test_image", 1 );
623 // Unlock the mutex now
624 pthread_mutex_unlock( &avformat_mutex );
627 /** Get the audio from a frame.
630 static int producer_get_audio( mlt_frame frame, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
632 // Get the properties from the frame
633 mlt_properties frame_properties = mlt_frame_properties( frame );
635 // Obtain the frame number of this frame
636 mlt_position position = mlt_properties_get_position( frame_properties, "avformat_position" );
639 mlt_producer this = mlt_properties_get_data( frame_properties, "avformat_producer", NULL );
641 // Get the producer properties
642 mlt_properties properties = mlt_producer_properties( this );
644 // Fetch the audio_context
645 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
647 // Get the audio_index
648 int index = mlt_properties_get_int( properties, "audio_index" );
650 // Obtain the expected frame numer
651 mlt_position expected = mlt_properties_get_position( properties, "audio_expected" );
653 // Obtain the resample context if it exists (not always needed)
654 ReSampleContext *resample = mlt_properties_get_data( properties, "audio_resample", NULL );
656 // Obtain the audio buffer
657 int16_t *audio_buffer = mlt_properties_get_data( properties, "audio_buffer", NULL );
659 // Get amount of audio used
660 int audio_used = mlt_properties_get_int( properties, "audio_used" );
662 // Calculate the real time code
663 double real_timecode = producer_time_of_frame( this, position );
665 // Get the audio stream
666 AVStream *stream = context->streams[ index ];
669 AVCodecContext *codec_context = &stream->codec;
674 // Number of frames to ignore (for ffwd)
677 // Flag for paused (silence)
681 // Lock the mutex now
682 pthread_mutex_lock( &avformat_mutex );
684 // Check for resample and create if necessary
685 if ( resample == NULL )
687 // Create the resampler
688 resample = audio_resample_init( *channels, codec_context->channels, *frequency, codec_context->sample_rate );
690 // And store it on properties
691 mlt_properties_set_data( properties, "audio_resample", resample, 0, ( mlt_destructor )audio_resample_close, NULL );
694 // Check for audio buffer and create if necessary
695 if ( audio_buffer == NULL )
697 // Allocate the audio buffer
698 audio_buffer = mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE * sizeof( int16_t ) );
700 // And store it on properties for reuse
701 mlt_properties_set_data( properties, "audio_buffer", audio_buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
705 if ( position != expected )
707 if ( position + 1 == expected )
709 // We're paused - silence required
712 else if ( position > expected && ( position - expected ) < 250 )
714 // Fast forward - seeking is inefficient for small distances - just ignore following frames
715 ignore = position - expected;
719 // Set to the real timecode
720 av_seek_frame( context, -1, real_timecode * 1000000.0 );
722 // Clear the usage in the audio buffer
729 // Get the audio if required
734 int16_t *temp = mlt_pool_alloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE );
736 memset( &pkt, 0, sizeof( pkt ) );
738 while( ret >= 0 && !got_audio )
740 // Check if the buffer already contains the samples required
741 if ( audio_used >= *samples && ignore == 0 )
748 ret = av_read_frame( context, &pkt );
751 uint8_t *ptr = pkt.data;
754 // We only deal with video from the selected video_index
755 while ( ptr != NULL && ret >= 0 && pkt.stream_index == index && len > 0 )
758 ret = avcodec_decode_audio( codec_context, temp, &data_size, ptr, len );
771 int size_out = audio_resample( resample, &audio_buffer[ audio_used * *channels ], temp, data_size / ( codec_context->channels * sizeof( int16_t ) ) );
773 audio_used += size_out;
776 while ( ignore && audio_used > *samples )
779 audio_used -= *samples;
780 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * sizeof( int16_t ) );
784 // If we're behind, ignore this packet
785 float current_pts = (float)pkt.pts / 1000000.0;
786 double discrepancy = mlt_properties_get_double( properties, "discrepancy" );
787 if ( current_pts != 0 && real_timecode != 0 )
789 if ( discrepancy != 1 )
790 discrepancy = ( discrepancy + ( real_timecode / current_pts ) ) / 2;
792 discrepancy = real_timecode / current_pts;
793 if ( discrepancy > 0.9 && discrepancy < 1.1 )
796 discrepancy = floor( discrepancy + 0.5 );
798 if ( discrepancy == 0 )
801 mlt_properties_set_double( properties, "discrepancy", discrepancy );
804 if ( !ignore && discrepancy * current_pts <= ( real_timecode - 0.02 ) )
808 // We're finished with this packet regardless
809 av_free_packet( &pkt );
812 *buffer = mlt_pool_alloc( *samples * *channels * sizeof( int16_t ) );
813 mlt_properties_set_data( frame_properties, "audio", *buffer, 0, ( mlt_destructor )mlt_pool_release, NULL );
815 // Now handle the audio if we have enough
816 if ( audio_used >= *samples )
818 memcpy( *buffer, audio_buffer, *samples * *channels * sizeof( int16_t ) );
819 audio_used -= *samples;
820 memmove( audio_buffer, &audio_buffer[ *samples * *channels ], audio_used * *channels * sizeof( int16_t ) );
824 memset( *buffer, 0, *samples * *channels * sizeof( int16_t ) );
827 // Store the number of audio samples still available
828 mlt_properties_set_int( properties, "audio_used", audio_used );
830 // Release the temporary audio
831 mlt_pool_release( temp );
835 // Get silence and don't touch the context
836 frame->get_audio = NULL;
837 mlt_frame_get_audio( frame, buffer, format, frequency, channels, samples );
840 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
841 mlt_properties_set_position( properties, "audio_expected", position + 1 );
843 // Unlock the mutex now
844 pthread_mutex_unlock( &avformat_mutex );
849 /** Set up audio handling.
852 static void producer_set_up_audio( mlt_producer this, mlt_frame frame )
854 // Get the properties
855 mlt_properties properties = mlt_producer_properties( this );
857 // Fetch the audio_context
858 AVFormatContext *context = mlt_properties_get_data( properties, "audio_context", NULL );
860 // Get the audio_index
861 int index = mlt_properties_get_int( properties, "audio_index" );
863 // Lock the mutex now
864 pthread_mutex_lock( &avformat_mutex );
866 // Deal with audio context
867 if ( context != NULL && index != -1 )
869 // Get the frame properties
870 mlt_properties frame_properties = mlt_frame_properties( frame );
872 // Get the audio stream
873 AVStream *stream = context->streams[ index ];
876 AVCodecContext *codec_context = &stream->codec;
879 AVCodec *codec = mlt_properties_get_data( properties, "audio_codec", NULL );
881 // Initialise the codec if necessary
885 codec = avcodec_find_decoder( codec_context->codec_id );
887 // If we don't have a codec and we can't initialise it, we can't do much more...
888 if ( codec != NULL && avcodec_open( codec_context, codec ) >= 0 )
890 // Now store the codec with its destructor
891 mlt_properties_set_data( properties, "audio_codec", codec_context, 0, producer_codec_close, NULL );
896 // Remember that we can't use this later
897 mlt_properties_set_int( properties, "audio_index", -1 );
901 // No codec, no show...
904 frame->get_audio = producer_get_audio;
905 mlt_properties_set_data( frame_properties, "avformat_producer", this, 0, NULL, NULL );
909 // Unlock the mutex now
910 pthread_mutex_unlock( &avformat_mutex );
913 /** Our get frame implementation.
916 static int producer_get_frame( mlt_producer this, mlt_frame_ptr frame, int index )
918 // Create an empty frame
919 *frame = mlt_frame_init( );
921 // Update timecode on the frame we're creating
922 mlt_frame_set_position( *frame, mlt_producer_position( this ) );
924 // Set the position of this producer
925 mlt_properties_set_position( mlt_frame_properties( *frame ), "avformat_position", mlt_producer_get_in( this ) + mlt_producer_position( this ) );
928 producer_set_up_video( this, *frame );
931 producer_set_up_audio( this, *frame );
933 // Set the aspect_ratio
934 mlt_properties_set_double( mlt_frame_properties( *frame ), "aspect_ratio", mlt_properties_get_double( mlt_producer_properties( this ), "aspect_ratio" ) );
936 // Calculate the next timecode
937 mlt_producer_prepare_next( this );