lavc: add a new bitstream filtering API
[libav.git] / libavcodec / bitstream_filters.c
CommitLineData
33d18982
AK
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
27extern const AVBitStreamFilter ff_aac_adtstoasc_bsf;
28extern const AVBitStreamFilter ff_chomp_bsf;
29extern const AVBitStreamFilter ff_dump_extradata_bsf;
30extern const AVBitStreamFilter ff_h264_mp4toannexb_bsf;
31extern const AVBitStreamFilter ff_hevc_mp4toannexb_bsf;
32extern const AVBitStreamFilter ff_imx_dump_header_bsf;
33extern const AVBitStreamFilter ff_mjpeg2jpeg_bsf;
34extern const AVBitStreamFilter ff_mjpega_dump_header_bsf;
35extern const AVBitStreamFilter ff_mov2textsub_bsf;
36extern const AVBitStreamFilter ff_text2movsub_bsf;
37extern const AVBitStreamFilter ff_noise_bsf;
38extern const AVBitStreamFilter ff_remove_extradata_bsf;
39
40static const AVBitStreamFilter *bitstream_filters[] = {
41#if CONFIG_AAC_ADTSTOASC_BSF
42 &ff_aac_adtstoasc_bsf,
43#endif
44#if CONFIG_CHOMP_BSF
45 &ff_chomp_bsf,
46#endif
47#if CONFIG_DUMP_EXTRADATA_BSF
48 &ff_dump_extradata_bsf,
49#endif
50#if CONFIG_H264_MP4TOANNEXB_BSF
51 &ff_h264_mp4toannexb_bsf,
52#endif
53#if CONFIG_HEVC_MP4TOANNEXB_BSF
54 &ff_hevc_mp4toannexb_bsf,
55#endif
56#if CONFIG_IMX_DUMP_HEADER_BSF
57 &ff_imx_dump_header_bsf,
58#endif
59#if CONFIG_MJPEG2JPEG_BSF
60 &ff_mjpeg2jpeg_bsf,
61#endif
62#if CONFIG_MJPEGA_DUMP_HEADER_BSF
63 &ff_mjpeg2jpeg_bsf,
64#endif
65#if CONFIG_MOV2TEXTSUB_BSF
66 &ff_mov2textsub_bsf,
67#endif
68#if CONFIG_TEXT2MOVSUB_BSF
69 &ff_text2movsub_bsf,
70#endif
71#if CONFIG_NOISE_BSF
72 &ff_noise_bsf,
73#endif
74#if CONFIG_REMOVE_EXTRADATA_BSF
75 &ff_remove_extradata_bsf,
76#endif
77 NULL,
78};
79
80const AVBitStreamFilter *av_bsf_next(void **opaque)
81{
82 uintptr_t i = (uintptr_t)*opaque;
83 const AVBitStreamFilter *f = bitstream_filters[i];
84
85 if (f)
86 *opaque = (void*)(i + 1);
87
88 return f;
89}
90
91const AVBitStreamFilter *av_bsf_get_by_name(const char *name)
92{
93 int i;
94
95 for (i = 0; bitstream_filters[i]; i++) {
96 const AVBitStreamFilter *f = bitstream_filters[i];
97 if (!strcmp(f->name, name))
98 return f;
99 }
100
101 return NULL;
102}
103
104const AVClass *ff_bsf_child_class_next(const AVClass *prev)
105{
106 int i;
107
108 /* find the filter that corresponds to prev */
109 for (i = 0; prev && bitstream_filters[i]; i++) {
110 if (bitstream_filters[i]->priv_class == prev) {
111 i++;
112 break;
113 }
114 }
115
116 /* find next filter with priv options */
117 for (; bitstream_filters[i]; i++)
118 if (bitstream_filters[i]->priv_class)
119 return bitstream_filters[i]->priv_class;
120 return NULL;
121}