libavcodec/bitstream_filter.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 static AVBitStreamFilter *first_bitstream_filter= NULL;
  24
  25 AVBitStreamFilter *av_bitstream_filter_next(AVBitStreamFilter *f){
  26     if(f) return f->next;
  27     else  return first_bitstream_filter;
  28 }
  29
  30 void av_register_bitstream_filter(AVBitStreamFilter *bsf){
  31     bsf->next = first_bitstream_filter;
  32     first_bitstream_filter= bsf;
  33 }
  34
  35 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
  36     AVBitStreamFilter *bsf= first_bitstream_filter;
  37
  38     while(bsf){
  39         if(!strcmp(name, bsf->name)){
  40             AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
  41             bsfc->filter= bsf;
  42             bsfc->priv_data= av_mallocz(bsf->priv_data_size);
  43             return bsfc;
  44         }
  45         bsf= bsf->next;
  46     }
  47     return NULL;
  48 }
  49
  50 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
  51     if(bsfc->filter->close)
  52         bsfc->filter->close(bsfc);
  53     av_freep(&bsfc->priv_data);
  54     av_parser_close(bsfc->parser);
  55     av_free(bsfc);
  56 }
  57
  58 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
  59                                AVCodecContext *avctx, const char *args,
  60                      uint8_t **poutbuf, int *poutbuf_size,
  61                      const uint8_t *buf, int buf_size, int keyframe){
  62     *poutbuf= (uint8_t *) buf;
  63     *poutbuf_size= buf_size;
  64     return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
  65 }