/src/ffmpeg/libavcodec/bsf/opus_metadata.c
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1 | | /* |
2 | | * This file is part of FFmpeg. |
3 | | * |
4 | | * FFmpeg 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 | | * FFmpeg 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 FFmpeg; if not, write to the Free Software |
16 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | | */ |
18 | | |
19 | | #include "libavcodec/bsf.h" |
20 | | #include "libavcodec/bsf_internal.h" |
21 | | #include "libavutil/intreadwrite.h" |
22 | | #include "libavutil/opt.h" |
23 | | |
24 | | typedef struct OpusBSFContext { |
25 | | const AVClass *class; |
26 | | int gain; |
27 | | } OpusBSFContext; |
28 | | |
29 | | static int opus_metadata_init(AVBSFContext *bsfc) |
30 | 259 | { |
31 | 259 | OpusBSFContext *s = bsfc->priv_data; |
32 | | |
33 | 259 | if (bsfc->par_out->extradata_size < 19) |
34 | 154 | return AVERROR_INVALIDDATA; |
35 | | |
36 | 105 | AV_WL16(bsfc->par_out->extradata + 16, s->gain); |
37 | | |
38 | 105 | return 0; |
39 | 259 | } |
40 | | |
41 | | #define OFFSET(x) offsetof(OpusBSFContext, x) |
42 | | #define FLAGS (AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM) |
43 | | static const AVOption opus_metadata_options[] = { |
44 | | { "gain", "Gain, actual amplification is pow(10, gain/(20.0*256))", OFFSET(gain), |
45 | | AV_OPT_TYPE_INT, { .i64 = 0 }, -(INT16_MAX + 1), INT16_MAX, .flags = FLAGS }, |
46 | | |
47 | | { NULL }, |
48 | | }; |
49 | | |
50 | | static const AVClass opus_metadata_class = { |
51 | | .class_name = "opus_metadata_bsf", |
52 | | .item_name = av_default_item_name, |
53 | | .option = opus_metadata_options, |
54 | | .version = LIBAVUTIL_VERSION_INT, |
55 | | }; |
56 | | |
57 | | static const enum AVCodecID codec_ids[] = { |
58 | | AV_CODEC_ID_OPUS, AV_CODEC_ID_NONE, |
59 | | }; |
60 | | |
61 | | const FFBitStreamFilter ff_opus_metadata_bsf = { |
62 | | .p.name = "opus_metadata", |
63 | | .p.codec_ids = codec_ids, |
64 | | .p.priv_class = &opus_metadata_class, |
65 | | .priv_data_size = sizeof(OpusBSFContext), |
66 | | .init = &opus_metadata_init, |
67 | | .filter = &ff_bsf_get_packet_ref, |
68 | | }; |