libavcodec/remove_extradata_bsf.c

   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 & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
  37            ||(!keyframe && cmd=='k')
  38            ||(cmd=='e' || !cmd)
  39           ){
  40             int i= s->parser->split(avctx, buf, buf_size);
  41             buf += i;
  42             buf_size -= i;
  43         }
  44     }
  45     *poutbuf= (uint8_t *) buf;
  46     *poutbuf_size= buf_size;
  47
  48     return 0;
  49 }
  50
  51 AVBitStreamFilter remove_extradata_bsf={
  52     "remove_extra",
  53     0,
  54     remove_extradata,
  55 };