2 * producer_avformat.c -- avformat producer
3 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
4 * Author: Charles Yates <charles.yates@pandora.be>
5 * Much code borrowed from ffmpeg.c: Copyright (c) 2000-2003 Fabrice Bellard
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <framework/mlt_producer.h>
24 #include <framework/mlt_frame.h>
26 // ffmpeg Header files
32 // System header files
38 void avformat_lock( );
39 void avformat_unlock( );
41 // Forward references.
42 static int producer_open( mlt_producer
this, mlt_profile profile
, char *file
);
43 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
);
45 /** Constructor for libavformat.
48 mlt_producer
producer_avformat_init( mlt_profile profile
, char *file
)
50 mlt_producer
this = NULL
;
52 // Check that we have a non-NULL argument
55 // Construct the producer
56 this = calloc( 1, sizeof( struct mlt_producer_s
) );
59 if ( mlt_producer_init( this, NULL
) == 0 )
62 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
64 // Set the resource property (required for all producers)
65 mlt_properties_set( properties
, "resource", file
);
67 // Register our get_frame implementation
68 this->get_frame
= producer_get_frame
;
71 if ( producer_open( this, profile
, file
) != 0 )
74 mlt_producer_close( this );
78 // Close the file to release resources for large playlists - reopen later as needed
79 mlt_properties_set_data( properties
, "dummy_context", NULL
, 0, NULL
, NULL
);
80 mlt_properties_set_data( properties
, "audio_context", NULL
, 0, NULL
, NULL
);
81 mlt_properties_set_data( properties
, "video_context", NULL
, 0, NULL
, NULL
);
88 /** Find the default streams.
91 static void find_default_streams( AVFormatContext
*context
, int *audio_index
, int *video_index
)
95 // Allow for multiple audio and video streams in the file and select first of each (if available)
96 for( i
= 0; i
< context
->nb_streams
; i
++ )
98 // Get the codec context
99 AVCodecContext
*codec_context
= context
->streams
[ i
]->codec
;
101 if ( avcodec_find_decoder( codec_context
->codec_id
) == NULL
)
104 // Determine the type and obtain the first index of each type
105 switch( codec_context
->codec_type
)
107 case CODEC_TYPE_VIDEO
:
108 if ( *video_index
< 0 )
111 case CODEC_TYPE_AUDIO
:
112 if ( *audio_index
< 0 )
121 /** Producer file destructor.
124 static void producer_file_close( void *context
)
126 if ( context
!= NULL
)
128 // Lock the mutex now
132 av_close_input_file( context
);
134 // Unlock the mutex now
139 /** Producer file destructor.
142 static void producer_codec_close( void *codec
)
146 // Lock the mutex now
150 avcodec_close( codec
);
152 // Unlock the mutex now
160 static int producer_open( mlt_producer
this, mlt_profile profile
, char *file
)
162 // Return an error code (0 == no error)
165 // Context for avformat
166 AVFormatContext
*context
= NULL
;
168 // Get the properties
169 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
171 // We will treat everything with the producer fps
172 double fps
= mlt_profile_fps( profile
);
174 // Lock the mutex now
177 // If "MRL", then create AVInputFormat
178 AVInputFormat
*format
= NULL
;
179 AVFormatParameters
*params
= NULL
;
180 char *standard
= NULL
;
181 char *mrl
= strchr( file
, ':' );
183 // AV option (0 = both, 1 = video, 2 = audio)
186 // Setting lowest log level
187 av_log_set_level( -1 );
189 // Only if there is not a protocol specification that avformat can handle
190 if ( mrl
&& !url_exist( file
) )
192 // 'file' becomes format abbreviation
196 format
= av_find_input_format( file
);
198 // Eat the format designator
204 params
= calloc( sizeof( AVFormatParameters
), 1 );
206 // These are required by video4linux (defaults)
208 params
->height
= 480;
209 params
->time_base
= (AVRational
){1,25};
210 // params->device = file;
211 params
->channels
= 2;
212 params
->sample_rate
= 48000;
215 // XXX: this does not work anymore since avdevice
216 // TODO: make producer_avddevice?
218 mrl
= strchr( file
, '?' );
222 char *name
= strdup( ++mrl
);
223 char *value
= strchr( name
, ':' );
228 char *t
= strchr( value
, '&' );
231 if ( !strcmp( name
, "frame_rate" ) )
232 params
->time_base
.den
= atoi( value
);
233 else if ( !strcmp( name
, "frame_rate_base" ) )
234 params
->time_base
.num
= atoi( value
);
235 else if ( !strcmp( name
, "sample_rate" ) )
236 params
->sample_rate
= atoi( value
);
237 else if ( !strcmp( name
, "channels" ) )
238 params
->channels
= atoi( value
);
239 else if ( !strcmp( name
, "width" ) )
240 params
->width
= atoi( value
);
241 else if ( !strcmp( name
, "height" ) )
242 params
->height
= atoi( value
);
243 else if ( !strcmp( name
, "standard" ) )
245 standard
= strdup( value
);
246 params
->standard
= standard
;
248 else if ( !strcmp( name
, "av" ) )
252 mrl
= strchr( mrl
, '&' );
256 // Now attempt to open the file
257 error
= av_open_input_file( &context
, file
, format
, 0, params
) < 0;
259 // Cleanup AVFormatParameters
263 // If successful, then try to get additional info
266 // Get the stream info
267 error
= av_find_stream_info( context
) < 0;
269 // Continue if no error
272 // We will default to the first audio and video streams found
273 int audio_index
= -1;
274 int video_index
= -1;
277 // Now set properties where we can (use default unknowns if required)
278 if ( context
->duration
!= AV_NOPTS_VALUE
)
280 // This isn't going to be accurate for all formats
281 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
+ 0.5 );
282 mlt_properties_set_position( properties
, "out", frames
- 1 );
283 mlt_properties_set_position( properties
, "length", frames
);
286 // Find default audio and video streams
287 find_default_streams( context
, &audio_index
, &video_index
);
289 if ( context
->start_time
!= AV_NOPTS_VALUE
)
290 mlt_properties_set_double( properties
, "_start_time", context
->start_time
);
292 // Check if we're seekable (something funny about mpeg here :-/)
293 if ( strcmp( file
, "pipe:" ) && strncmp( file
, "http://", 6 ) )
295 mlt_properties_set_int( properties
, "seekable", av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ), AVSEEK_FLAG_BACKWARD
) >= 0 );
296 mlt_properties_set_data( properties
, "dummy_context", context
, 0, producer_file_close
, NULL
);
297 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
298 av_find_stream_info( context
);
303 // Store selected audio and video indexes on properties
304 mlt_properties_set_int( properties
, "audio_index", audio_index
);
305 mlt_properties_set_int( properties
, "video_index", video_index
);
306 mlt_properties_set_int( properties
, "_last_position", -1 );
308 // Fetch the width, height and aspect ratio
309 if ( video_index
!= -1 )
311 AVCodecContext
*codec_context
= context
->streams
[ video_index
]->codec
;
312 mlt_properties_set_int( properties
, "width", codec_context
->width
);
313 mlt_properties_set_int( properties
, "height", codec_context
->height
);
314 mlt_properties_set_double( properties
, "aspect_ratio", av_q2d( codec_context
->sample_aspect_ratio
) );
318 if (context
->title
!= NULL
)
319 mlt_properties_set(properties
, "meta.attr.title.markup", context
->title
);
320 if (context
->author
!= NULL
)
321 mlt_properties_set(properties
, "meta.attr.author.markup", context
->author
);
322 if (context
->copyright
!= NULL
)
323 mlt_properties_set(properties
, "meta.attr.copyright.markup", context
->copyright
);
324 if (context
->comment
!= NULL
)
325 mlt_properties_set(properties
, "meta.attr.comment.markup", context
->comment
);
326 if (context
->album
!= NULL
)
327 mlt_properties_set(properties
, "meta.attr.album.markup", context
->album
);
328 if (context
->year
!= 0)
329 mlt_properties_set_int(properties
, "meta.attr.year.markup", context
->year
);
330 if (context
->track
!= 0)
331 mlt_properties_set_int(properties
, "meta.attr.track.markup", context
->track
);
333 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
334 if ( av
== 0 && !av_bypass
&& audio_index
!= -1 && video_index
!= -1 )
336 // We'll use the open one as our video_context
337 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
339 // And open again for our audio context
340 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
341 av_find_stream_info( context
);
344 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
346 else if ( av
!= 2 && video_index
!= -1 )
348 // We only have a video context
349 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
351 else if ( audio_index
!= -1 )
353 // We only have an audio context
354 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
358 // Something has gone wrong
362 mlt_properties_set_int( properties
, "av_bypass", av_bypass
);
366 // Unlock the mutex now
372 /** Convert a frame position to a time code.
375 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
377 return ( double )position
/ mlt_producer_get_fps( this );
380 static inline void convert_image( AVFrame
*frame
, uint8_t *buffer
, int pix_fmt
, mlt_image_format format
, int width
, int height
)
383 if ( format
== mlt_image_yuv420p
)
385 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
386 width
, height
, PIX_FMT_YUV420P
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
388 output
.data
[0] = buffer
;
389 output
.data
[1] = buffer
+ width
* height
;
390 output
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
391 output
.linesize
[0] = width
;
392 output
.linesize
[1] = width
>> 1;
393 output
.linesize
[2] = width
>> 1;
394 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
395 output
.data
, output
.linesize
);
396 sws_freeContext( context
);
398 else if ( format
== mlt_image_rgb24
)
400 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
401 width
, height
, PIX_FMT_RGB24
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
403 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
404 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
405 output
.data
, output
.linesize
);
406 sws_freeContext( context
);
410 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
411 width
, height
, PIX_FMT_YUYV422
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
413 avpicture_fill( &output
, buffer
, PIX_FMT_YUYV422
, width
, height
);
414 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
415 output
.data
, output
.linesize
);
416 sws_freeContext( context
);
419 if ( format
== mlt_image_yuv420p
)
422 pict
.data
[0] = buffer
;
423 pict
.data
[1] = buffer
+ width
* height
;
424 pict
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
425 pict
.linesize
[0] = width
;
426 pict
.linesize
[1] = width
>> 1;
427 pict
.linesize
[2] = width
>> 1;
428 img_convert( &pict
, PIX_FMT_YUV420P
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
430 else if ( format
== mlt_image_rgb24
)
433 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
434 img_convert( &output
, PIX_FMT_RGB24
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
439 avpicture_fill( &output
, buffer
, PIX_FMT_YUV422
, width
, height
);
440 img_convert( &output
, PIX_FMT_YUV422
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
445 /** Get an image from a frame.
448 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
450 // Get the properties from the frame
451 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
453 // Obtain the frame number of this frame
454 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
457 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
459 // Get the producer properties
460 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
462 // Fetch the video_context
463 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
465 // Get the video_index
466 int index
= mlt_properties_get_int( properties
, "video_index" );
468 // Obtain the expected frame numer
469 mlt_position expected
= mlt_properties_get_position( properties
, "_video_expected" );
471 // Get the video stream
472 AVStream
*stream
= context
->streams
[ index
];
475 AVCodecContext
*codec_context
= stream
->codec
;
480 // Get the conversion frame
481 AVFrame
*av_frame
= mlt_properties_get_data( properties
, "av_frame", NULL
);
483 // Special case pause handling flag
486 // Special case ffwd handling
489 // We may want to use the source fps if available
490 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
491 double fps
= mlt_producer_get_fps( this );
493 // This is the physical frame position in the source
494 int req_position
= ( int )( position
/ fps
* source_fps
+ 0.5 );
496 // Get the seekable status
497 int seekable
= mlt_properties_get_int( properties
, "seekable" );
499 // Generate the size in bytes
502 // Hopefully provide better support for streams...
503 int av_bypass
= mlt_properties_get_int( properties
, "av_bypass" );
505 // Determines if we have to decode all frames in a sequence
508 // Set the result arguments that we know here (only *buffer is now required)
509 *width
= codec_context
->width
;
510 *height
= codec_context
->height
;
514 case mlt_image_yuv420p
:
515 size
= *width
* 3 * ( *height
+ 1 ) / 2;
517 case mlt_image_rgb24
:
518 size
= *width
* ( *height
+ 1 ) * 3;
521 *format
= mlt_image_yuv422
;
522 size
= *width
* ( *height
+ 1 ) * 2;
526 // Set this on the frame properties
527 mlt_properties_set_int( frame_properties
, "width", *width
);
528 mlt_properties_set_int( frame_properties
, "height", *height
);
530 // Construct the output image
531 *buffer
= mlt_pool_alloc( size
);
533 // Temporary hack to improve intra frame only
534 must_decode
= strcmp( codec_context
->codec
->name
, "mjpeg" ) &&
535 strcmp( codec_context
->codec
->name
, "rawvideo" ) &&
536 strcmp( codec_context
->codec
->name
, "dvvideo" );
539 if ( position
!= expected
)
541 if ( av_frame
!= NULL
&& position
+ 1 == expected
)
543 // We're paused - use last image
546 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
548 // Fast forward - seeking is inefficient for small distances - just ignore following frames
549 ignore
= ( int )( ( position
- expected
) / fps
* source_fps
);
551 else if ( seekable
&& ( position
< expected
|| position
- expected
>= 12 ) )
553 // Calculate the timestamp for the requested frame
554 int64_t timestamp
= ( int64_t )( ( double )req_position
/ source_fps
* AV_TIME_BASE
+ 0.5 );
555 if ( ( uint64_t )context
->start_time
!= AV_NOPTS_VALUE
)
556 timestamp
+= context
->start_time
;
558 timestamp
-= AV_TIME_BASE
;
562 // Set to the timestamp
563 av_seek_frame( context
, -1, timestamp
, AVSEEK_FLAG_BACKWARD
);
565 // Remove the cached info relating to the previous position
566 mlt_properties_set_int( properties
, "_current_position", -1 );
567 mlt_properties_set_int( properties
, "_last_position", -1 );
568 mlt_properties_set_data( properties
, "av_frame", NULL
, 0, NULL
, NULL
);
573 // Duplicate the last image if necessary (see comment on rawvideo below)
574 int current_position
= mlt_properties_get_int( properties
, "_current_position" );
575 int got_picture
= mlt_properties_get_int( properties
, "_got_picture" );
576 if ( av_frame
!= NULL
&& got_picture
&& ( paused
|| current_position
>= req_position
) && av_bypass
== 0 )
579 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
581 // Set this on the frame properties
582 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
587 int int_position
= 0;
590 av_init_packet( &pkt
);
592 // Construct an AVFrame for YUV422 conversion
593 if ( av_frame
== NULL
)
595 av_frame
= avcodec_alloc_frame( );
596 mlt_properties_set_data( properties
, "av_frame", av_frame
, 0, av_free
, NULL
);
599 while( ret
>= 0 && !got_picture
)
602 ret
= av_read_frame( context
, &pkt
);
604 // We only deal with video from the selected video_index
605 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
607 // Determine time code of the packet
608 int_position
= ( int )( av_q2d( stream
->time_base
) * pkt
.dts
* source_fps
+ 0.5 );
609 if ( context
->start_time
!= AV_NOPTS_VALUE
)
610 int_position
-= ( int )( context
->start_time
* source_fps
/ AV_TIME_BASE
+ 0.5 );
611 int last_position
= mlt_properties_get_int( properties
, "_last_position" );
612 if ( int_position
== last_position
)
613 int_position
= last_position
+ 1;
614 mlt_properties_set_int( properties
, "_last_position", int_position
);
617 if ( must_decode
|| int_position
>= req_position
)
618 ret
= avcodec_decode_video( codec_context
, av_frame
, &got_picture
, pkt
.data
, pkt
.size
);
623 if ( int_position
< req_position
)
628 else if ( int_position
>= req_position
)
632 else if ( ignore
-- )
637 av_free_packet( &pkt
);
641 av_free_packet( &pkt
);
644 // Now handle the picture if we have one
647 mlt_properties_set_int( frame_properties
, "progressive", !av_frame
->interlaced_frame
);
648 mlt_properties_set_int( properties
, "top_field_first", av_frame
->top_field_first
);
649 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
650 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, (mlt_destructor
)mlt_pool_release
, NULL
);
651 mlt_properties_set_int( properties
, "_current_position", int_position
);
652 mlt_properties_set_int( properties
, "_got_picture", 1 );
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
);
684 mlt_events_block( properties
, this );
685 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
686 mlt_properties_get( properties
, "resource" ) );
687 context
= mlt_properties_get_data( properties
, "video_context", NULL
);
688 mlt_properties_set_data( properties
, "dummy_context", NULL
, 0, NULL
, NULL
);
689 mlt_events_unblock( properties
, this );
692 // Get the video_index
693 int index
= mlt_properties_get_int( properties
, "video_index" );
695 // Get the frame properties
696 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
698 if ( context
!= NULL
&& index
!= -1 )
700 // Get the video stream
701 AVStream
*stream
= context
->streams
[ index
];
704 AVCodecContext
*codec_context
= stream
->codec
;
707 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
709 // Initialise the codec if necessary
712 // Initialise multi-threading
713 int thread_count
= mlt_properties_get_int( properties
, "threads" );
714 if ( thread_count
== 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
715 thread_count
= atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
716 if ( thread_count
> 1 )
718 avcodec_thread_init( codec_context
, thread_count
);
719 codec_context
->thread_count
= thread_count
;
723 codec
= avcodec_find_decoder( codec_context
->codec_id
);
725 // If we don't have a codec and we can't initialise it, we can't do much more...
727 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
729 // Now store the codec with its destructor
730 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
734 // Remember that we can't use this later
735 mlt_properties_set_int( properties
, "video_index", -1 );
740 // No codec, no show...
743 double source_fps
= 0;
744 int norm_aspect_ratio
= mlt_properties_get_int( properties
, "norm_aspect_ratio" );
745 double force_aspect_ratio
= mlt_properties_get_double( properties
, "force_aspect_ratio" );
748 if ( strcmp( codec_context
->codec
->name
, "dvvideo" ) == 0 )
750 // Override FFmpeg's notion of DV aspect ratios, which are
751 // based upon a width of 704. Since we do not have a normaliser
752 // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
753 // we just coerce the values to facilitate a passive behaviour through
754 // the rescale normaliser when using equivalent producers and consumers.
755 // = display_aspect / (width * height)
756 if ( codec_context
->sample_aspect_ratio
.num
== 10 &&
757 codec_context
->sample_aspect_ratio
.den
== 11 )
758 force_aspect_ratio
= 8.0/9.0; // 4:3 NTSC
759 else if ( codec_context
->sample_aspect_ratio
.num
== 59 &&
760 codec_context
->sample_aspect_ratio
.den
== 54 )
761 force_aspect_ratio
= 16.0/15.0; // 4:3 PAL
762 else if ( codec_context
->sample_aspect_ratio
.num
== 40 &&
763 codec_context
->sample_aspect_ratio
.den
== 33 )
764 force_aspect_ratio
= 32.0/27.0; // 16:9 NTSC
765 else if ( codec_context
->sample_aspect_ratio
.num
== 118 &&
766 codec_context
->sample_aspect_ratio
.den
== 81 )
767 force_aspect_ratio
= 64.0/45.0; // 16:9 PAL
770 // XXX: We won't know the real aspect ratio until an image is decoded
771 // but we do need it now (to satisfy filter_resize) - take a guess based
773 if ( force_aspect_ratio
> 0.0 )
775 aspect_ratio
= force_aspect_ratio
;
777 else if ( !norm_aspect_ratio
&& codec_context
->sample_aspect_ratio
.num
> 0 )
779 aspect_ratio
= av_q2d( codec_context
->sample_aspect_ratio
);
787 source_fps
= ( double )codec_context
->time_base
.den
/ ( codec_context
->time_base
.num
== 0 ?
1 : codec_context
->time_base
.num
);
789 // We'll use fps if it's available
790 if ( source_fps
> 0 )
791 mlt_properties_set_double( properties
, "source_fps", source_fps
);
793 mlt_properties_set_double( properties
, "source_fps", mlt_producer_get_fps( this ) );
794 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
796 // Set the width and height
797 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
798 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
799 mlt_properties_set_double( frame_properties
, "aspect_ratio", aspect_ratio
);
801 mlt_frame_push_get_image( frame
, producer_get_image
);
802 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
806 mlt_properties_set_int( frame_properties
, "test_image", 1 );
811 mlt_properties_set_int( frame_properties
, "test_image", 1 );
815 /** Get the audio from a frame.
818 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
820 // Get the properties from the frame
821 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
823 // Obtain the frame number of this frame
824 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
827 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
829 // Get the producer properties
830 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
832 // Fetch the audio_context
833 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
835 // Get the audio_index
836 int index
= mlt_properties_get_int( properties
, "audio_index" );
838 // Get the seekable status
839 int seekable
= mlt_properties_get_int( properties
, "seekable" );
841 // Obtain the expected frame numer
842 mlt_position expected
= mlt_properties_get_position( properties
, "_audio_expected" );
844 // Obtain the resample context if it exists (not always needed)
845 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
847 // Obtain the audio buffer
848 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
850 // Get amount of audio used
851 int audio_used
= mlt_properties_get_int( properties
, "_audio_used" );
853 // Calculate the real time code
854 double real_timecode
= producer_time_of_frame( this, position
);
856 // Get the audio stream
857 AVStream
*stream
= context
->streams
[ index
];
860 AVCodecContext
*codec_context
= stream
->codec
;
865 // Number of frames to ignore (for ffwd)
868 // Flag for paused (silence)
871 // Check for resample and create if necessary
872 if ( resample
== NULL
&& codec_context
->channels
<= 2 )
874 // Create the resampler
875 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
877 // And store it on properties
878 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
880 else if ( resample
== NULL
)
882 *channels
= codec_context
->channels
;
883 *frequency
= codec_context
->sample_rate
;
886 // Check for audio buffer and create if necessary
887 if ( audio_buffer
== NULL
)
889 // Allocate the audio buffer
890 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
892 // And store it on properties for reuse
893 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
897 if ( position
!= expected
)
899 if ( position
+ 1 == expected
)
901 // We're paused - silence required
904 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
906 // Fast forward - seeking is inefficient for small distances - just ignore following frames
907 ignore
= position
- expected
;
909 else if ( position
< expected
|| position
- expected
>= 12 )
911 // Set to the real timecode
912 if ( av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ) + real_timecode
* 1000000.0, AVSEEK_FLAG_BACKWARD
) != 0 )
915 // Clear the usage in the audio buffer
920 // Get the audio if required
925 int16_t *temp
= av_malloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
927 av_init_packet( &pkt
);
929 while( ret
>= 0 && !got_audio
)
931 // Check if the buffer already contains the samples required
932 if ( audio_used
>= *samples
&& ignore
== 0 )
939 ret
= av_read_frame( context
, &pkt
);
942 uint8_t *ptr
= pkt
.data
;
944 // We only deal with audio from the selected audio_index
945 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
947 int data_size
= sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
;
950 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
951 ret
= avcodec_decode_audio2( codec_context
, temp
, &data_size
, ptr
, len
);
953 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
966 if ( resample
!= NULL
)
968 audio_used
+= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
972 memcpy( &audio_buffer
[ audio_used
* *channels
], temp
, data_size
);
973 audio_used
+= data_size
/ ( codec_context
->channels
* sizeof( int16_t ) );
977 while ( ignore
&& audio_used
> *samples
)
980 audio_used
-= *samples
;
981 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
985 // If we're behind, ignore this packet
986 float current_pts
= av_q2d( stream
->time_base
) * pkt
.pts
;
987 if ( seekable
&& ( !ignore
&& current_pts
<= ( real_timecode
- 0.02 ) ) )
991 // We're finished with this packet regardless
992 av_free_packet( &pkt
);
995 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
996 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
998 // Now handle the audio if we have enough
999 if ( audio_used
>= *samples
)
1001 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
1002 audio_used
-= *samples
;
1003 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
1007 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
1010 // Store the number of audio samples still available
1011 mlt_properties_set_int( properties
, "_audio_used", audio_used
);
1013 // Release the temporary audio
1018 // Get silence and don't touch the context
1019 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
1022 // Regardless of speed (other than paused), we expect to get the next frame
1024 mlt_properties_set_position( properties
, "_audio_expected", position
+ 1 );
1029 /** Set up audio handling.
1032 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
1034 // Get the properties
1035 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
1037 // Fetch the audio_context
1038 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
1040 // Get the audio_index
1041 int index
= mlt_properties_get_int( properties
, "audio_index" );
1043 // Deal with audio context
1044 if ( context
!= NULL
&& index
!= -1 )
1046 // Get the frame properties
1047 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
1049 // Get the audio stream
1050 AVStream
*stream
= context
->streams
[ index
];
1052 // Get codec context
1053 AVCodecContext
*codec_context
= stream
->codec
;
1056 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
1058 // Initialise the codec if necessary
1059 if ( codec
== NULL
)
1062 codec
= avcodec_find_decoder( codec_context
->codec_id
);
1064 // If we don't have a codec and we can't initialise it, we can't do much more...
1066 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
1068 // Now store the codec with its destructor
1069 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
1074 // Remember that we can't use this later
1075 mlt_properties_set_int( properties
, "audio_index", -1 );
1080 // No codec, no show...
1081 if ( codec
!= NULL
)
1083 mlt_frame_push_audio( frame
, producer_get_audio
);
1084 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
1085 mlt_properties_set_int( frame_properties
, "frequency", codec_context
->sample_rate
);
1086 mlt_properties_set_int( frame_properties
, "channels", codec_context
->channels
);
1091 /** Our get frame implementation.
1094 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
1096 // Create an empty frame
1097 *frame
= mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1099 // Update timecode on the frame we're creating
1100 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
1102 // Set the position of this producer
1103 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame
), "avformat_position", mlt_producer_frame( this ) );
1106 producer_set_up_video( this, *frame
);
1109 producer_set_up_audio( this, *frame
);
1111 // Set the aspect_ratio
1112 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame
), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1114 // Calculate the next timecode
1115 mlt_producer_prepare_next( this );