FFmpeg: libavcodec/remove_extradata_bsf.c Source File

FFmpeg
remove_extradata_bsf.c
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "avcodec.h"
22 
23 
24  static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
25  uint8_t **poutbuf, int *poutbuf_size,
26  const uint8_t *buf, int buf_size, int keyframe){
27  int cmd= args ? *args : 0;
28  AVCodecParserContext *s;
29 
30  if(!bsfc->parser){
31  bsfc->parser= av_parser_init(avctx->codec_id);
32  }
33  s= bsfc->parser;
34 
35  if(s && s->parser->split){
36  if( (((avctx->flags & AV_CODEC_FLAG_GLOBAL_HEADER) ||
37  (avctx->flags2 & AV_CODEC_FLAG2_LOCAL_HEADER)) && cmd == 'a')
38  ||(!keyframe && cmd=='k')
39  ||(cmd=='e' || !cmd)
40  ){
41  int i= s->parser->split(avctx, buf, buf_size);
42  buf += i;
43  buf_size -= i;
44  }
45  }
46  *poutbuf= (uint8_t *) buf;
47  *poutbuf_size= buf_size;
48 
49  return 0;
50 }
51 
52  AVBitStreamFilter ff_remove_extradata_bsf={
53  .name = "remove_extra",
54  .filter = remove_extradata,
55 };
s
const char * s
Definition: avisynth_c.h:631
AVBitStreamFilterContext::parser
AVCodecParserContext * parser
Definition: avcodec.h:5141
uint8_t
uint8_t
Definition: audio_convert.c:194
AVBitStreamFilter::name
const char * name
Definition: avcodec.h:5152
AVCodecParserContext::parser
struct AVCodecParser * parser
Definition: avcodec.h:4423
AVCodecContext::flags
int flags
AV_CODEC_FLAG_*.
Definition: avcodec.h:1627
av_parser_init
AVCodecParserContext * av_parser_init(int codec_id)
Definition: parser.c:51
avcodec.h
Libavcodec external API header.
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:1549
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
AV_CODEC_FLAG2_LOCAL_HEADER
#define AV_CODEC_FLAG2_LOCAL_HEADER
Place global headers at every keyframe instead of in extradata.
Definition: avcodec.h:810
buf
void * buf
Definition: avisynth_c.h:553
remove_extradata
static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args, uint8_t **poutbuf, int *poutbuf_size, const uint8_t *buf, int buf_size, int keyframe)
Definition: remove_extradata_bsf.c:24
AV_CODEC_FLAG_GLOBAL_HEADER
#define AV_CODEC_FLAG_GLOBAL_HEADER
Place global headers in extradata instead of every keyframe.
Definition: avcodec.h:783
AVCodecParser::split
int(* split)(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
Definition: avcodec.h:4599
ff_remove_extradata_bsf
AVBitStreamFilter ff_remove_extradata_bsf
Definition: remove_extradata_bsf.c:52
AVCodecContext::flags2
int flags2
AV_CODEC_FLAG2_*.
Definition: avcodec.h:1634

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