lavc: add a bitstream filter for extracting extradata from packets
[libav.git] / libavcodec / bitstream_filters.c
1 /*
2 * This file is part of Libav.
3 *
4 * Libav is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * Libav is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with Libav; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #include "config.h"
20
21 #include "libavutil/common.h"
22 #include "libavutil/log.h"
23
24 #include "avcodec.h"
25 #include "bsf.h"
26
27 extern const AVBitStreamFilter ff_aac_adtstoasc_bsf;
28 extern const AVBitStreamFilter ff_chomp_bsf;
29 extern const AVBitStreamFilter ff_dump_extradata_bsf;
30 extern const AVBitStreamFilter ff_extract_extradata_bsf;
31 extern const AVBitStreamFilter ff_h264_mp4toannexb_bsf;
32 extern const AVBitStreamFilter ff_hevc_mp4toannexb_bsf;
33 extern const AVBitStreamFilter ff_imx_dump_header_bsf;
34 extern const AVBitStreamFilter ff_mjpeg2jpeg_bsf;
35 extern const AVBitStreamFilter ff_mjpega_dump_header_bsf;
36 extern const AVBitStreamFilter ff_mov2textsub_bsf;
37 extern const AVBitStreamFilter ff_text2movsub_bsf;
38 extern const AVBitStreamFilter ff_noise_bsf;
39 extern const AVBitStreamFilter ff_remove_extradata_bsf;
40
41 #include "libavcodec/bsf_list.c"
42
43 const AVBitStreamFilter *av_bsf_next(void **opaque)
44 {
45 uintptr_t i = (uintptr_t)*opaque;
46 const AVBitStreamFilter *f = bitstream_filters[i];
47
48 if (f)
49 *opaque = (void*)(i + 1);
50
51 return f;
52 }
53
54 const AVBitStreamFilter *av_bsf_get_by_name(const char *name)
55 {
56 int i;
57
58 for (i = 0; bitstream_filters[i]; i++) {
59 const AVBitStreamFilter *f = bitstream_filters[i];
60 if (!strcmp(f->name, name))
61 return f;
62 }
63
64 return NULL;
65 }
66
67 const AVClass *ff_bsf_child_class_next(const AVClass *prev)
68 {
69 int i;
70
71 /* find the filter that corresponds to prev */
72 for (i = 0; prev && bitstream_filters[i]; i++) {
73 if (bitstream_filters[i]->priv_class == prev) {
74 i++;
75 break;
76 }
77 }
78
79 /* find next filter with priv options */
80 for (; bitstream_filters[i]; i++)
81 if (bitstream_filters[i]->priv_class)
82 return bitstream_filters[i]->priv_class;
83 return NULL;
84 }