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[frescor/ffmpeg.git] / 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 }