avcodec/bitstream_filter: Use av_bitstream_filter_next() instead of direct access...
[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 <string.h>
22
23 #include "avcodec.h"
24 #include "libavutil/atomic.h"
25 #include "libavutil/mem.h"
26
27 static AVBitStreamFilter *first_bitstream_filter = NULL;
28
29 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)
30 {
31     if (f)
32         return f->next;
33     else
34         return first_bitstream_filter;
35 }
36
37 void av_register_bitstream_filter(AVBitStreamFilter *bsf)
38 {
39     do {
40         bsf->next = first_bitstream_filter;
41     } while(bsf->next != avpriv_atomic_ptr_cas((void * volatile *)&first_bitstream_filter, bsf->next, bsf));
42 }
43
44 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
45 {
46     AVBitStreamFilter *bsf = NULL;
47
48     while (bsf = av_bitstream_filter_next(bsf)) {
49         if (!strcmp(name, bsf->name)) {
50             AVBitStreamFilterContext *bsfc =
51                 av_mallocz(sizeof(AVBitStreamFilterContext));
52             bsfc->filter    = bsf;
53             bsfc->priv_data =
54                 bsf->priv_data_size ? av_mallocz(bsf->priv_data_size) : NULL;
55             return bsfc;
56         }
57     }
58     return NULL;
59 }
60
61 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
62 {
63     if (!bsfc)
64         return;
65     if (bsfc->filter->close)
66         bsfc->filter->close(bsfc);
67     av_freep(&bsfc->priv_data);
68     av_parser_close(bsfc->parser);
69     av_free(bsfc);
70 }
71
72 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
73                                AVCodecContext *avctx, const char *args,
74                                uint8_t **poutbuf, int *poutbuf_size,
75                                const uint8_t *buf, int buf_size, int keyframe)
76 {
77     *poutbuf      = (uint8_t *)buf;
78     *poutbuf_size = buf_size;
79     return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size,
80                                 buf, buf_size, keyframe);
81 }