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 );
79 // Close the file to release resources for large playlists - reopen later as needed
80 mlt_properties_set_data( properties
, "dummy_context", NULL
, 0, NULL
, NULL
);
81 mlt_properties_set_data( properties
, "audio_context", NULL
, 0, NULL
, NULL
);
82 mlt_properties_set_data( properties
, "video_context", NULL
, 0, NULL
, NULL
);
84 // Default the user-selectable indices from the auto-detected indices
85 mlt_properties_set_int( properties
, "audio_index", mlt_properties_get_int( properties
, "_audio_index" ) );
86 mlt_properties_set_int( properties
, "video_index", mlt_properties_get_int( properties
, "_video_index" ) );
94 /** Find the default streams.
97 static void find_default_streams( AVFormatContext
*context
, int *audio_index
, int *video_index
)
101 // Allow for multiple audio and video streams in the file and select first of each (if available)
102 for( i
= 0; i
< context
->nb_streams
; i
++ )
104 // Get the codec context
105 AVCodecContext
*codec_context
= context
->streams
[ i
]->codec
;
107 if ( avcodec_find_decoder( codec_context
->codec_id
) == NULL
)
110 // Determine the type and obtain the first index of each type
111 switch( codec_context
->codec_type
)
113 case CODEC_TYPE_VIDEO
:
114 if ( *video_index
< 0 )
117 case CODEC_TYPE_AUDIO
:
118 if ( *audio_index
< 0 )
127 /** Producer file destructor.
130 static void producer_file_close( void *context
)
132 if ( context
!= NULL
)
134 // Lock the mutex now
138 av_close_input_file( context
);
140 // Unlock the mutex now
145 /** Producer file destructor.
148 static void producer_codec_close( void *codec
)
152 // Lock the mutex now
156 avcodec_close( codec
);
158 // Unlock the mutex now
163 static inline int dv_is_pal( AVPacket
*pkt
)
165 return pkt
->data
[3] & 0x80;
168 static int dv_is_wide( AVPacket
*pkt
)
170 int i
= 80 /* block size */ *3 /* VAUX starts at block 3 */ +3 /* skip block header */;
172 for ( ; i
< pkt
->size
; i
+= 5 /* packet size */ )
174 if ( pkt
->data
[ i
] == 0x61 )
176 uint8_t x
= pkt
->data
[ i
+ 2 ] & 0x7;
177 return ( x
== 2 ) || ( x
== 7 );
183 static double get_aspect_ratio( AVStream
*stream
, AVCodecContext
*codec_context
, AVPacket
*pkt
)
185 double aspect_ratio
= 1.0;
187 if ( codec_context
->codec_id
== CODEC_ID_DVVIDEO
)
191 if ( dv_is_pal( pkt
) )
193 aspect_ratio
= dv_is_wide( pkt
)
194 ?
64.0/45.0 // 16:9 PAL
195 : 16.0/15.0; // 4:3 PAL
199 aspect_ratio
= dv_is_wide( pkt
)
200 ?
32.0/27.0 // 16:9 NTSC
201 : 8.0/9.0; // 4:3 NTSC
207 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
208 stream
->sample_aspect_ratio
;
210 codec_context
->sample_aspect_ratio
;
212 // Override FFmpeg's notion of DV aspect ratios, which are
213 // based upon a width of 704. Since we do not have a normaliser
214 // that crops (nor is cropping 720 wide ITU-R 601 video always desirable)
215 // we just coerce the values to facilitate a passive behaviour through
216 // the rescale normaliser when using equivalent producers and consumers.
217 // = display_aspect / (width * height)
218 if ( ar
.num
== 10 && ar
.den
== 11 )
219 aspect_ratio
= 8.0/9.0; // 4:3 NTSC
220 else if ( ar
.num
== 59 && ar
.den
== 54 )
221 aspect_ratio
= 16.0/15.0; // 4:3 PAL
222 else if ( ar
.num
== 40 && ar
.den
== 33 )
223 aspect_ratio
= 32.0/27.0; // 16:9 NTSC
224 else if ( ar
.num
== 118 && ar
.den
== 81 )
225 aspect_ratio
= 64.0/45.0; // 16:9 PAL
230 AVRational codec_sar
= codec_context
->sample_aspect_ratio
;
231 AVRational stream_sar
=
232 #if LIBAVFORMAT_VERSION_INT >= ((52<<16)+(21<<8)+0)
233 stream
->sample_aspect_ratio
;
237 if ( codec_sar
.num
> 0 )
238 aspect_ratio
= av_q2d( codec_sar
);
239 else if ( stream_sar
.num
> 0 )
240 aspect_ratio
= av_q2d( stream_sar
);
248 static int producer_open( mlt_producer
this, mlt_profile profile
, char *file
)
250 // Return an error code (0 == no error)
253 // Context for avformat
254 AVFormatContext
*context
= NULL
;
256 // Get the properties
257 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
259 // We will treat everything with the producer fps
260 double fps
= mlt_profile_fps( profile
);
262 // Lock the mutex now
265 // If "MRL", then create AVInputFormat
266 AVInputFormat
*format
= NULL
;
267 AVFormatParameters
*params
= NULL
;
268 char *standard
= NULL
;
269 char *mrl
= strchr( file
, ':' );
271 // AV option (0 = both, 1 = video, 2 = audio)
274 // Setting lowest log level
275 av_log_set_level( -1 );
277 // Only if there is not a protocol specification that avformat can handle
278 if ( mrl
&& !url_exist( file
) )
280 // 'file' becomes format abbreviation
284 format
= av_find_input_format( file
);
286 // Eat the format designator
292 params
= calloc( sizeof( AVFormatParameters
), 1 );
294 // These are required by video4linux (defaults)
296 params
->height
= 480;
297 params
->time_base
= (AVRational
){1,25};
298 // params->device = file;
299 params
->channels
= 2;
300 params
->sample_rate
= 48000;
303 // XXX: this does not work anymore since avdevice
304 // TODO: make producer_avddevice?
306 mrl
= strchr( file
, '?' );
310 char *name
= strdup( ++mrl
);
311 char *value
= strchr( name
, ':' );
316 char *t
= strchr( value
, '&' );
319 if ( !strcmp( name
, "frame_rate" ) )
320 params
->time_base
.den
= atoi( value
);
321 else if ( !strcmp( name
, "frame_rate_base" ) )
322 params
->time_base
.num
= atoi( value
);
323 else if ( !strcmp( name
, "sample_rate" ) )
324 params
->sample_rate
= atoi( value
);
325 else if ( !strcmp( name
, "channels" ) )
326 params
->channels
= atoi( value
);
327 else if ( !strcmp( name
, "width" ) )
328 params
->width
= atoi( value
);
329 else if ( !strcmp( name
, "height" ) )
330 params
->height
= atoi( value
);
331 else if ( !strcmp( name
, "standard" ) )
333 standard
= strdup( value
);
334 params
->standard
= standard
;
336 else if ( !strcmp( name
, "av" ) )
340 mrl
= strchr( mrl
, '&' );
344 // Now attempt to open the file
345 error
= av_open_input_file( &context
, file
, format
, 0, params
) < 0;
347 // Cleanup AVFormatParameters
351 // If successful, then try to get additional info
354 // Get the stream info
355 error
= av_find_stream_info( context
) < 0;
357 // Continue if no error
360 // We will default to the first audio and video streams found
361 int audio_index
= -1;
362 int video_index
= -1;
365 // Now set properties where we can (use default unknowns if required)
366 if ( context
->duration
!= AV_NOPTS_VALUE
)
368 // This isn't going to be accurate for all formats
369 mlt_position frames
= ( mlt_position
)( ( ( double )context
->duration
/ ( double )AV_TIME_BASE
) * fps
+ 0.5 );
370 mlt_properties_set_position( properties
, "out", frames
- 1 );
371 mlt_properties_set_position( properties
, "length", frames
);
374 // Find default audio and video streams
375 find_default_streams( context
, &audio_index
, &video_index
);
377 if ( context
->start_time
!= AV_NOPTS_VALUE
)
378 mlt_properties_set_double( properties
, "_start_time", context
->start_time
);
380 // Check if we're seekable (something funny about mpeg here :-/)
381 if ( strcmp( file
, "pipe:" ) && strncmp( file
, "http://", 6 ) && strncmp( file
, "udp:", 4 ) && strncmp( file
, "tcp:", 4 ) && strncmp( file
, "rtsp:", 5 ) && strncmp( file
, "rtp:", 4 ) )
383 mlt_properties_set_int( properties
, "seekable", av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ), AVSEEK_FLAG_BACKWARD
) >= 0 );
384 mlt_properties_set_data( properties
, "dummy_context", context
, 0, producer_file_close
, NULL
);
385 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
386 av_find_stream_info( context
);
391 // Store selected audio and video indexes on properties
392 mlt_properties_set_int( properties
, "_audio_index", audio_index
);
393 mlt_properties_set_int( properties
, "_video_index", video_index
);
394 mlt_properties_set_int( properties
, "_last_position", -1 );
396 // Fetch the width, height and aspect ratio
397 if ( video_index
!= -1 )
399 AVCodecContext
*codec_context
= context
->streams
[ video_index
]->codec
;
400 mlt_properties_set_int( properties
, "width", codec_context
->width
);
401 mlt_properties_set_int( properties
, "height", codec_context
->height
);
403 if ( codec_context
->codec_id
== CODEC_ID_DVVIDEO
)
405 // Fetch the first frame of DV so we can read it directly
410 ret
= av_read_frame( context
, &pkt
);
411 if ( ret
>= 0 && pkt
.stream_index
== video_index
&& pkt
.size
> 0 )
413 mlt_properties_set_double( properties
, "aspect_ratio",
414 get_aspect_ratio( context
->streams
[ video_index
], codec_context
, &pkt
) );
421 mlt_properties_set_double( properties
, "aspect_ratio",
422 get_aspect_ratio( context
->streams
[ video_index
], codec_context
, NULL
) );
427 if (context
->title
!= NULL
)
428 mlt_properties_set(properties
, "meta.attr.title.markup", context
->title
);
429 if (context
->author
!= NULL
)
430 mlt_properties_set(properties
, "meta.attr.author.markup", context
->author
);
431 if (context
->copyright
!= NULL
)
432 mlt_properties_set(properties
, "meta.attr.copyright.markup", context
->copyright
);
433 if (context
->comment
!= NULL
)
434 mlt_properties_set(properties
, "meta.attr.comment.markup", context
->comment
);
435 if (context
->album
!= NULL
)
436 mlt_properties_set(properties
, "meta.attr.album.markup", context
->album
);
437 if (context
->year
!= 0)
438 mlt_properties_set_int(properties
, "meta.attr.year.markup", context
->year
);
439 if (context
->track
!= 0)
440 mlt_properties_set_int(properties
, "meta.attr.track.markup", context
->track
);
442 // We're going to cheat here - for a/v files, we will have two contexts (reasoning will be clear later)
443 if ( av
== 0 && audio_index
!= -1 && video_index
!= -1 )
445 // We'll use the open one as our video_context
446 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
448 // And open again for our audio context
449 av_open_input_file( &context
, file
, NULL
, 0, NULL
);
450 av_find_stream_info( context
);
453 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
455 else if ( av
!= 2 && video_index
!= -1 )
457 // We only have a video context
458 mlt_properties_set_data( properties
, "video_context", context
, 0, producer_file_close
, NULL
);
460 else if ( audio_index
!= -1 )
462 // We only have an audio context
463 mlt_properties_set_data( properties
, "audio_context", context
, 0, producer_file_close
, NULL
);
467 // Something has gone wrong
471 mlt_properties_set_int( properties
, "av_bypass", av_bypass
);
475 // Unlock the mutex now
481 /** Convert a frame position to a time code.
484 static double producer_time_of_frame( mlt_producer
this, mlt_position position
)
486 return ( double )position
/ mlt_producer_get_fps( this );
489 static inline void convert_image( AVFrame
*frame
, uint8_t *buffer
, int pix_fmt
, mlt_image_format format
, int width
, int height
)
492 if ( format
== mlt_image_yuv420p
)
494 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
495 width
, height
, PIX_FMT_YUV420P
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
497 output
.data
[0] = buffer
;
498 output
.data
[1] = buffer
+ width
* height
;
499 output
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
500 output
.linesize
[0] = width
;
501 output
.linesize
[1] = width
>> 1;
502 output
.linesize
[2] = width
>> 1;
503 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
504 output
.data
, output
.linesize
);
505 sws_freeContext( context
);
507 else if ( format
== mlt_image_rgb24
)
509 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
510 width
, height
, PIX_FMT_RGB24
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
512 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
513 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
514 output
.data
, output
.linesize
);
515 sws_freeContext( context
);
519 struct SwsContext
*context
= sws_getContext( width
, height
, pix_fmt
,
520 width
, height
, PIX_FMT_YUYV422
, SWS_FAST_BILINEAR
, NULL
, NULL
, NULL
);
522 avpicture_fill( &output
, buffer
, PIX_FMT_YUYV422
, width
, height
);
523 sws_scale( context
, frame
->data
, frame
->linesize
, 0, height
,
524 output
.data
, output
.linesize
);
525 sws_freeContext( context
);
528 if ( format
== mlt_image_yuv420p
)
531 pict
.data
[0] = buffer
;
532 pict
.data
[1] = buffer
+ width
* height
;
533 pict
.data
[2] = buffer
+ ( 3 * width
* height
) / 2;
534 pict
.linesize
[0] = width
;
535 pict
.linesize
[1] = width
>> 1;
536 pict
.linesize
[2] = width
>> 1;
537 img_convert( &pict
, PIX_FMT_YUV420P
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
539 else if ( format
== mlt_image_rgb24
)
542 avpicture_fill( &output
, buffer
, PIX_FMT_RGB24
, width
, height
);
543 img_convert( &output
, PIX_FMT_RGB24
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
548 avpicture_fill( &output
, buffer
, PIX_FMT_YUV422
, width
, height
);
549 img_convert( &output
, PIX_FMT_YUV422
, (AVPicture
*)frame
, pix_fmt
, width
, height
);
554 /** Get an image from a frame.
557 static int producer_get_image( mlt_frame frame
, uint8_t **buffer
, mlt_image_format
*format
, int *width
, int *height
, int writable
)
559 // Get the properties from the frame
560 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
562 // Obtain the frame number of this frame
563 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
566 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
568 // Get the producer properties
569 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
571 // Fetch the video_context
572 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
574 // Get the video_index
575 int index
= mlt_properties_get_int( properties
, "video_index" );
577 // Obtain the expected frame numer
578 mlt_position expected
= mlt_properties_get_position( properties
, "_video_expected" );
580 // Get the video stream
581 AVStream
*stream
= context
->streams
[ index
];
584 AVCodecContext
*codec_context
= stream
->codec
;
589 // Get the conversion frame
590 AVFrame
*av_frame
= mlt_properties_get_data( properties
, "av_frame", NULL
);
592 // Special case pause handling flag
595 // Special case ffwd handling
598 // We may want to use the source fps if available
599 double source_fps
= mlt_properties_get_double( properties
, "source_fps" );
600 double fps
= mlt_producer_get_fps( this );
602 // This is the physical frame position in the source
603 int req_position
= ( int )( position
/ fps
* source_fps
+ 0.5 );
605 // Get the seekable status
606 int seekable
= mlt_properties_get_int( properties
, "seekable" );
608 // Generate the size in bytes
611 // Hopefully provide better support for streams...
612 int av_bypass
= mlt_properties_get_int( properties
, "av_bypass" );
614 // Determines if we have to decode all frames in a sequence
617 // Set the result arguments that we know here (only *buffer is now required)
618 *width
= codec_context
->width
;
619 *height
= codec_context
->height
;
623 case mlt_image_yuv420p
:
624 size
= *width
* 3 * ( *height
+ 1 ) / 2;
626 case mlt_image_rgb24
:
627 size
= *width
* ( *height
+ 1 ) * 3;
630 *format
= mlt_image_yuv422
;
631 size
= *width
* ( *height
+ 1 ) * 2;
635 // Set this on the frame properties
636 mlt_properties_set_int( frame_properties
, "width", *width
);
637 mlt_properties_set_int( frame_properties
, "height", *height
);
639 // Construct the output image
640 *buffer
= mlt_pool_alloc( size
);
642 // Temporary hack to improve intra frame only
643 must_decode
= strcmp( codec_context
->codec
->name
, "mjpeg" ) &&
644 strcmp( codec_context
->codec
->name
, "rawvideo" ) &&
645 strcmp( codec_context
->codec
->name
, "dvvideo" );
648 if ( position
!= expected
)
650 if ( av_frame
!= NULL
&& position
+ 1 == expected
)
652 // We're paused - use last image
655 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
657 // Fast forward - seeking is inefficient for small distances - just ignore following frames
658 ignore
= ( int )( ( position
- expected
) / fps
* source_fps
);
660 else if ( seekable
&& ( position
< expected
|| position
- expected
>= 12 ) )
662 // Calculate the timestamp for the requested frame
663 int64_t timestamp
= ( int64_t )( ( double )req_position
/ source_fps
* AV_TIME_BASE
+ 0.5 );
664 if ( ( uint64_t )context
->start_time
!= AV_NOPTS_VALUE
)
665 timestamp
+= context
->start_time
;
667 timestamp
-= AV_TIME_BASE
;
671 // Set to the timestamp
672 av_seek_frame( context
, -1, timestamp
, AVSEEK_FLAG_BACKWARD
);
674 // Remove the cached info relating to the previous position
675 mlt_properties_set_int( properties
, "_current_position", -1 );
676 mlt_properties_set_int( properties
, "_last_position", -1 );
677 mlt_properties_set_data( properties
, "av_frame", NULL
, 0, NULL
, NULL
);
682 // Duplicate the last image if necessary (see comment on rawvideo below)
683 int current_position
= mlt_properties_get_int( properties
, "_current_position" );
684 int got_picture
= mlt_properties_get_int( properties
, "_got_picture" );
685 if ( av_frame
!= NULL
&& got_picture
&& ( paused
|| current_position
>= req_position
) && av_bypass
== 0 )
688 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
690 // Set this on the frame properties
691 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, ( mlt_destructor
)mlt_pool_release
, NULL
);
696 int int_position
= 0;
699 av_init_packet( &pkt
);
701 // Construct an AVFrame for YUV422 conversion
702 if ( av_frame
== NULL
)
704 av_frame
= avcodec_alloc_frame( );
705 mlt_properties_set_data( properties
, "av_frame", av_frame
, 0, av_free
, NULL
);
708 while( ret
>= 0 && !got_picture
)
711 ret
= av_read_frame( context
, &pkt
);
713 // We only deal with video from the selected video_index
714 if ( ret
>= 0 && pkt
.stream_index
== index
&& pkt
.size
> 0 )
716 // Determine time code of the packet
717 int_position
= ( int )( av_q2d( stream
->time_base
) * pkt
.dts
* source_fps
+ 0.5 );
718 if ( context
->start_time
!= AV_NOPTS_VALUE
)
719 int_position
-= ( int )( context
->start_time
* source_fps
/ AV_TIME_BASE
+ 0.5 );
720 int last_position
= mlt_properties_get_int( properties
, "_last_position" );
721 if ( int_position
== last_position
)
722 int_position
= last_position
+ 1;
723 mlt_properties_set_int( properties
, "_last_position", int_position
);
726 if ( must_decode
|| int_position
>= req_position
)
727 ret
= avcodec_decode_video( codec_context
, av_frame
, &got_picture
, pkt
.data
, pkt
.size
);
732 if ( int_position
< req_position
)
737 else if ( int_position
>= req_position
)
741 else if ( ignore
-- )
746 av_free_packet( &pkt
);
750 av_free_packet( &pkt
);
753 // Now handle the picture if we have one
756 mlt_properties_set_int( frame_properties
, "progressive", !av_frame
->interlaced_frame
);
757 mlt_properties_set_int( properties
, "top_field_first", av_frame
->top_field_first
);
758 convert_image( av_frame
, *buffer
, codec_context
->pix_fmt
, *format
, *width
, *height
);
759 mlt_properties_set_data( frame_properties
, "image", *buffer
, size
, (mlt_destructor
)mlt_pool_release
, NULL
);
760 mlt_properties_set_int( properties
, "_current_position", int_position
);
761 mlt_properties_set_int( properties
, "_got_picture", 1 );
765 mlt_frame_get_image( frame
, buffer
, format
, width
, height
, writable
);
768 // Very untidy - for rawvideo, the packet contains the frame, hence the free packet
769 // above will break the pause behaviour - so we wipe the frame now
770 if ( !strcmp( codec_context
->codec
->name
, "rawvideo" ) )
771 mlt_properties_set_data( properties
, "av_frame", NULL
, 0, NULL
, NULL
);
773 // Set the field order property for this frame
774 mlt_properties_set_int( frame_properties
, "top_field_first", mlt_properties_get_int( properties
, "top_field_first" ) );
776 // Regardless of speed, we expect to get the next frame (cos we ain't too bright)
777 mlt_properties_set_position( properties
, "_video_expected", position
+ 1 );
782 /** Set up video handling.
785 static void producer_set_up_video( mlt_producer
this, mlt_frame frame
)
787 // Get the properties
788 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
790 // Fetch the video_context
791 AVFormatContext
*context
= mlt_properties_get_data( properties
, "video_context", NULL
);
793 // Get the video_index
794 int index
= mlt_properties_get_int( properties
, "video_index" );
796 // Reopen the file if necessary
797 if ( !context
&& index
> -1 )
799 mlt_events_block( properties
, this );
800 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
801 mlt_properties_get( properties
, "resource" ) );
802 context
= mlt_properties_get_data( properties
, "video_context", NULL
);
803 mlt_properties_set_data( properties
, "dummy_context", NULL
, 0, NULL
, NULL
);
804 mlt_events_unblock( properties
, this );
807 // Exception handling for video_index
808 if ( context
&& index
>= (int) context
->nb_streams
)
810 // Get the last video stream
811 for ( index
= context
->nb_streams
- 1; index
>= 0 && context
->streams
[ index
]->codec
->codec_type
!= CODEC_TYPE_VIDEO
; --index
);
812 mlt_properties_set_int( properties
, "video_index", index
);
814 if ( context
&& index
> -1 && context
->streams
[ index
]->codec
->codec_type
!= CODEC_TYPE_VIDEO
)
816 // Invalidate the video stream
818 mlt_properties_set_int( properties
, "video_index", index
);
821 // Get the frame properties
822 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
824 if ( context
&& index
> -1 )
826 // Get the video stream
827 AVStream
*stream
= context
->streams
[ index
];
830 AVCodecContext
*codec_context
= stream
->codec
;
833 AVCodec
*codec
= mlt_properties_get_data( properties
, "video_codec", NULL
);
835 // Update the video properties if the index changed
836 if ( index
!= mlt_properties_get_int( properties
, "_video_index" ) )
838 // Reset the video properties if the index changed
839 mlt_properties_set_int( properties
, "_video_index", index
);
840 mlt_properties_set_data( properties
, "video_codec", NULL
, 0, NULL
, NULL
);
841 mlt_properties_set_int( properties
, "width", codec_context
->width
);
842 mlt_properties_set_int( properties
, "height", codec_context
->height
);
843 // TODO: get the first usable AVPacket and reset the stream position
844 mlt_properties_set_double( properties
, "aspect_ratio",
845 get_aspect_ratio( context
->streams
[ index
], codec_context
, NULL
) );
849 // Initialise the codec if necessary
852 // Initialise multi-threading
853 int thread_count
= mlt_properties_get_int( properties
, "threads" );
854 if ( thread_count
== 0 && getenv( "MLT_AVFORMAT_THREADS" ) )
855 thread_count
= atoi( getenv( "MLT_AVFORMAT_THREADS" ) );
856 if ( thread_count
> 1 )
858 avcodec_thread_init( codec_context
, thread_count
);
859 codec_context
->thread_count
= thread_count
;
863 codec
= avcodec_find_decoder( codec_context
->codec_id
);
865 // If we don't have a codec and we can't initialise it, we can't do much more...
867 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
869 // Now store the codec with its destructor
870 mlt_properties_set_data( properties
, "video_codec", codec_context
, 0, producer_codec_close
, NULL
);
874 // Remember that we can't use this later
875 mlt_properties_set_int( properties
, "video_index", -1 );
880 // No codec, no show...
883 double source_fps
= 0;
884 double force_aspect_ratio
= mlt_properties_get_double( properties
, "force_aspect_ratio" );
885 double aspect_ratio
= ( force_aspect_ratio
> 0.0 ) ?
886 force_aspect_ratio
: mlt_properties_get_double( properties
, "aspect_ratio" );
889 source_fps
= ( double )codec_context
->time_base
.den
/ ( codec_context
->time_base
.num
== 0 ?
1 : codec_context
->time_base
.num
);
891 // We'll use fps if it's available
892 if ( source_fps
> 0 )
893 mlt_properties_set_double( properties
, "source_fps", source_fps
);
895 mlt_properties_set_double( properties
, "source_fps", mlt_producer_get_fps( this ) );
896 mlt_properties_set_double( properties
, "aspect_ratio", aspect_ratio
);
898 // Set the width and height
899 mlt_properties_set_int( frame_properties
, "width", codec_context
->width
);
900 mlt_properties_set_int( frame_properties
, "height", codec_context
->height
);
901 mlt_properties_set_double( frame_properties
, "aspect_ratio", aspect_ratio
);
903 mlt_frame_push_get_image( frame
, producer_get_image
);
904 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
908 mlt_properties_set_int( frame_properties
, "test_image", 1 );
913 mlt_properties_set_int( frame_properties
, "test_image", 1 );
917 /** Get the audio from a frame.
920 static int producer_get_audio( mlt_frame frame
, int16_t **buffer
, mlt_audio_format
*format
, int *frequency
, int *channels
, int *samples
)
922 // Get the properties from the frame
923 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
925 // Obtain the frame number of this frame
926 mlt_position position
= mlt_properties_get_position( frame_properties
, "avformat_position" );
929 mlt_producer
this = mlt_properties_get_data( frame_properties
, "avformat_producer", NULL
);
931 // Get the producer properties
932 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
934 // Fetch the audio_context
935 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
937 // Get the audio_index
938 int index
= mlt_properties_get_int( properties
, "audio_index" );
940 // Get the seekable status
941 int seekable
= mlt_properties_get_int( properties
, "seekable" );
943 // Obtain the expected frame numer
944 mlt_position expected
= mlt_properties_get_position( properties
, "_audio_expected" );
946 // Obtain the resample context if it exists (not always needed)
947 ReSampleContext
*resample
= mlt_properties_get_data( properties
, "audio_resample", NULL
);
949 // Obtain the audio buffer
950 int16_t *audio_buffer
= mlt_properties_get_data( properties
, "audio_buffer", NULL
);
952 // Get amount of audio used
953 int audio_used
= mlt_properties_get_int( properties
, "_audio_used" );
955 // Calculate the real time code
956 double real_timecode
= producer_time_of_frame( this, position
);
958 // Get the audio stream
959 AVStream
*stream
= context
->streams
[ index
];
962 AVCodecContext
*codec_context
= stream
->codec
;
967 // Number of frames to ignore (for ffwd)
970 // Flag for paused (silence)
973 // Check for resample and create if necessary
974 if ( resample
== NULL
&& codec_context
->channels
<= 2 )
976 // Create the resampler
977 resample
= audio_resample_init( *channels
, codec_context
->channels
, *frequency
, codec_context
->sample_rate
);
979 // And store it on properties
980 mlt_properties_set_data( properties
, "audio_resample", resample
, 0, ( mlt_destructor
)audio_resample_close
, NULL
);
982 else if ( resample
== NULL
)
984 *channels
= codec_context
->channels
;
985 *frequency
= codec_context
->sample_rate
;
988 // Check for audio buffer and create if necessary
989 if ( audio_buffer
== NULL
)
991 // Allocate the audio buffer
992 audio_buffer
= mlt_pool_alloc( AVCODEC_MAX_AUDIO_FRAME_SIZE
* sizeof( int16_t ) );
994 // And store it on properties for reuse
995 mlt_properties_set_data( properties
, "audio_buffer", audio_buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
999 if ( position
!= expected
)
1001 if ( position
+ 1 == expected
)
1003 // We're paused - silence required
1006 else if ( !seekable
&& position
> expected
&& ( position
- expected
) < 250 )
1008 // Fast forward - seeking is inefficient for small distances - just ignore following frames
1009 ignore
= position
- expected
;
1011 else if ( position
< expected
|| position
- expected
>= 12 )
1013 // Set to the real timecode
1014 if ( av_seek_frame( context
, -1, mlt_properties_get_double( properties
, "_start_time" ) + real_timecode
* 1000000.0, AVSEEK_FLAG_BACKWARD
) != 0 )
1017 // Clear the usage in the audio buffer
1022 // Get the audio if required
1027 int16_t *temp
= av_malloc( sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
);
1029 av_init_packet( &pkt
);
1031 while( ret
>= 0 && !got_audio
)
1033 // Check if the buffer already contains the samples required
1034 if ( audio_used
>= *samples
&& ignore
== 0 )
1041 ret
= av_read_frame( context
, &pkt
);
1044 uint8_t *ptr
= pkt
.data
;
1046 // We only deal with audio from the selected audio_index
1047 while ( ptr
!= NULL
&& ret
>= 0 && pkt
.stream_index
== index
&& len
> 0 )
1049 int data_size
= sizeof( int16_t ) * AVCODEC_MAX_AUDIO_FRAME_SIZE
;
1052 #if (LIBAVCODEC_VERSION_INT >= ((51<<16)+(29<<8)+0))
1053 ret
= avcodec_decode_audio2( codec_context
, temp
, &data_size
, ptr
, len
);
1055 ret
= avcodec_decode_audio( codec_context
, temp
, &data_size
, ptr
, len
);
1066 if ( data_size
> 0 )
1068 if ( resample
!= NULL
)
1070 audio_used
+= audio_resample( resample
, &audio_buffer
[ audio_used
* *channels
], temp
, data_size
/ ( codec_context
->channels
* sizeof( int16_t ) ) );
1074 memcpy( &audio_buffer
[ audio_used
* *channels
], temp
, data_size
);
1075 audio_used
+= data_size
/ ( codec_context
->channels
* sizeof( int16_t ) );
1079 while ( ignore
&& audio_used
> *samples
)
1082 audio_used
-= *samples
;
1083 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* sizeof( int16_t ) );
1087 // If we're behind, ignore this packet
1090 float current_pts
= av_q2d( stream
->time_base
) * pkt
.pts
;
1091 if ( seekable
&& ( !ignore
&& current_pts
<= ( real_timecode
- 0.02 ) ) )
1096 // We're finished with this packet regardless
1097 av_free_packet( &pkt
);
1100 *buffer
= mlt_pool_alloc( *samples
* *channels
* sizeof( int16_t ) );
1101 mlt_properties_set_data( frame_properties
, "audio", *buffer
, 0, ( mlt_destructor
)mlt_pool_release
, NULL
);
1103 // Now handle the audio if we have enough
1104 if ( audio_used
>= *samples
)
1106 memcpy( *buffer
, audio_buffer
, *samples
* *channels
* sizeof( int16_t ) );
1107 audio_used
-= *samples
;
1108 memmove( audio_buffer
, &audio_buffer
[ *samples
* *channels
], audio_used
* *channels
* sizeof( int16_t ) );
1112 memset( *buffer
, 0, *samples
* *channels
* sizeof( int16_t ) );
1115 // Store the number of audio samples still available
1116 mlt_properties_set_int( properties
, "_audio_used", audio_used
);
1118 // Release the temporary audio
1123 // Get silence and don't touch the context
1124 mlt_frame_get_audio( frame
, buffer
, format
, frequency
, channels
, samples
);
1127 // Regardless of speed (other than paused), we expect to get the next frame
1129 mlt_properties_set_position( properties
, "_audio_expected", position
+ 1 );
1134 /** Set up audio handling.
1137 static void producer_set_up_audio( mlt_producer
this, mlt_frame frame
)
1139 // Get the properties
1140 mlt_properties properties
= MLT_PRODUCER_PROPERTIES( this );
1142 // Fetch the audio_context
1143 AVFormatContext
*context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
1145 // Get the audio_index
1146 int index
= mlt_properties_get_int( properties
, "audio_index" );
1148 // Reopen the file if necessary
1149 if ( !context
&& index
> -1 )
1151 mlt_events_block( properties
, this );
1152 producer_open( this, mlt_service_profile( MLT_PRODUCER_SERVICE(this) ),
1153 mlt_properties_get( properties
, "resource" ) );
1154 context
= mlt_properties_get_data( properties
, "audio_context", NULL
);
1155 mlt_properties_set_data( properties
, "dummy_context", NULL
, 0, NULL
, NULL
);
1156 mlt_events_unblock( properties
, this );
1159 // Exception handling for audio_index
1160 if ( context
&& index
>= (int) context
->nb_streams
)
1162 for ( index
= context
->nb_streams
- 1; index
>= 0 && context
->streams
[ index
]->codec
->codec_type
!= CODEC_TYPE_AUDIO
; --index
);
1163 mlt_properties_set_int( properties
, "audio_index", index
);
1165 if ( context
&& index
> -1 && context
->streams
[ index
]->codec
->codec_type
!= CODEC_TYPE_AUDIO
)
1168 mlt_properties_set_int( properties
, "audio_index", index
);
1171 // Update the audio properties if the index changed
1172 if ( index
> -1 && index
!= mlt_properties_get_int( properties
, "_audio_index" ) ) {
1173 mlt_properties_set_int( properties
, "_audio_index", index
);
1174 mlt_properties_set_data( properties
, "audio_codec", NULL
, 0, NULL
, NULL
);
1177 // Deal with audio context
1178 if ( context
!= NULL
&& index
> -1 )
1180 // Get the frame properties
1181 mlt_properties frame_properties
= MLT_FRAME_PROPERTIES( frame
);
1183 // Get the audio stream
1184 AVStream
*stream
= context
->streams
[ index
];
1186 // Get codec context
1187 AVCodecContext
*codec_context
= stream
->codec
;
1190 AVCodec
*codec
= mlt_properties_get_data( properties
, "audio_codec", NULL
);
1192 // Initialise the codec if necessary
1193 if ( codec
== NULL
)
1196 codec
= avcodec_find_decoder( codec_context
->codec_id
);
1198 // If we don't have a codec and we can't initialise it, we can't do much more...
1200 if ( codec
!= NULL
&& avcodec_open( codec_context
, codec
) >= 0 )
1202 // Now store the codec with its destructor
1203 mlt_properties_set_data( properties
, "audio_codec", codec_context
, 0, producer_codec_close
, NULL
);
1208 // Remember that we can't use this later
1209 mlt_properties_set_int( properties
, "audio_index", -1 );
1214 // No codec, no show...
1215 if ( codec
!= NULL
)
1217 mlt_frame_push_audio( frame
, producer_get_audio
);
1218 mlt_properties_set_data( frame_properties
, "avformat_producer", this, 0, NULL
, NULL
);
1219 mlt_properties_set_int( frame_properties
, "frequency", codec_context
->sample_rate
);
1220 mlt_properties_set_int( frame_properties
, "channels", codec_context
->channels
);
1225 /** Our get frame implementation.
1228 static int producer_get_frame( mlt_producer
this, mlt_frame_ptr frame
, int index
)
1230 // Create an empty frame
1231 *frame
= mlt_frame_init( MLT_PRODUCER_SERVICE( this ) );
1233 // Update timecode on the frame we're creating
1234 mlt_frame_set_position( *frame
, mlt_producer_position( this ) );
1236 // Set the position of this producer
1237 mlt_properties_set_position( MLT_FRAME_PROPERTIES( *frame
), "avformat_position", mlt_producer_frame( this ) );
1240 producer_set_up_video( this, *frame
);
1243 producer_set_up_audio( this, *frame
);
1245 // Set the aspect_ratio
1246 mlt_properties_set_double( MLT_FRAME_PROPERTIES( *frame
), "aspect_ratio", mlt_properties_get_double( MLT_PRODUCER_PROPERTIES( this ), "aspect_ratio" ) );
1248 // Calculate the next timecode
1249 mlt_producer_prepare_next( this );