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 /* type pun fix */
28 typedef union {
29 AVBitStreamFilter *t_AVBSF;
30 void * volatile t_vvoid;
31 } AVBSF_t;
32
33 static AVBSF_t first_bitstream_filter = {NULL};
34
av_bitstream_filter_next(const AVBitStreamFilter * f)35 AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)
36 {
37 if (f)
38 return f->next;
39 else
40 return first_bitstream_filter.t_AVBSF;
41 }
42
av_register_bitstream_filter(AVBitStreamFilter * bsf)43 void av_register_bitstream_filter(AVBitStreamFilter *bsf)
44 {
45 do {
46 bsf->next = first_bitstream_filter.t_AVBSF;
47 } while(bsf->next != avpriv_atomic_ptr_cas((void * volatile *)&first_bitstream_filter, bsf->next, bsf));
48 }
49
av_bitstream_filter_init(const char * name)50 AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
51 {
52 AVBitStreamFilter *bsf = first_bitstream_filter.t_AVBSF;
53
54 while (bsf) {
55 if (!strcmp(name, bsf->name)) {
56 AVBitStreamFilterContext *bsfc =
57 av_mallocz(sizeof(AVBitStreamFilterContext));
58 bsfc->filter = bsf;
59 bsfc->priv_data =
60 bsf->priv_data_size ? av_mallocz(bsf->priv_data_size) : NULL;
61 return bsfc;
62 }
63 bsf = bsf->next;
64 }
65 return NULL;
66 }
67
av_bitstream_filter_close(AVBitStreamFilterContext * bsfc)68 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
69 {
70 if (!bsfc)
71 return;
72 if (bsfc->filter->close)
73 bsfc->filter->close(bsfc);
74 av_freep(&bsfc->priv_data);
75 av_parser_close(bsfc->parser);
76 av_free(bsfc);
77 }
78
av_bitstream_filter_filter(AVBitStreamFilterContext * bsfc,AVCodecContext * avctx,const char * args,uint8_t ** poutbuf,int * poutbuf_size,const uint8_t * buf,int buf_size,int keyframe)79 int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
80 AVCodecContext *avctx, const char *args,
81 uint8_t **poutbuf, int *poutbuf_size,
82 const uint8_t *buf, int buf_size, int keyframe)
83 {
84 *poutbuf = (uint8_t *)buf;
85 *poutbuf_size = buf_size;
86 return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size,
87 buf, buf_size, keyframe);
88 }
89