FFmpeg
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 "bsf.h"
20 #include "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;
28 
30 {
31  OpusBSFContext *s = bsfc->priv_data;
32 
33  if (bsfc->par_out->extradata_size < 19)
34  return AVERROR_INVALIDDATA;
35 
36  AV_WL16(bsfc->par_out->extradata + 16, s->gain);
37 
38  return 0;
39 }
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[] = {
59 };
60 
62  .p.name = "opus_metadata",
63  .p.codec_ids = codec_ids,
64  .p.priv_class = &opus_metadata_class,
65  .priv_data_size = sizeof(OpusBSFContext),
68 };
OpusBSFContext::gain
int gain
Definition: opus_metadata.c:26
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
opt.h
bsf_internal.h
opus_metadata_init
static int opus_metadata_init(AVBSFContext *bsfc)
Definition: opus_metadata.c:29
AVBitStreamFilter::name
const char * name
Definition: bsf.h:112
AVOption
AVOption.
Definition: opt.h:429
FLAGS
#define FLAGS
Definition: opus_metadata.c:42
filter
void(* filter)(uint8_t *src, int stride, int qscale)
Definition: h263dsp.c:29
AVBSFContext
The bitstream filter state.
Definition: bsf.h:68
bsf.h
OFFSET
#define OFFSET(x)
Definition: opus_metadata.c:41
AVBSFContext::par_out
AVCodecParameters * par_out
Parameters of the output stream.
Definition: bsf.h:96
ff_opus_metadata_bsf
const FFBitStreamFilter ff_opus_metadata_bsf
Definition: opus_metadata.c:61
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:198
opus_metadata_class
static const AVClass opus_metadata_class
Definition: opus_metadata.c:50
opus_metadata_options
static const AVOption opus_metadata_options[]
Definition: opus_metadata.c:43
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
codec_ids
static enum AVCodecID codec_ids[]
Definition: opus_metadata.c:57
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:75
NULL
#define NULL
Definition: coverity.c:32
FFBitStreamFilter
Definition: bsf_internal.h:27
OpusBSFContext
Definition: opus_metadata.c:24
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:49
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
FFBitStreamFilter::p
AVBitStreamFilter p
The public AVBitStreamFilter.
Definition: bsf_internal.h:31
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
AV_CODEC_ID_OPUS
@ AV_CODEC_ID_OPUS
Definition: codec_id.h:505
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:408
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
AVBSFContext::priv_data
void * priv_data
Opaque filter-specific private data.
Definition: bsf.h:83
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:80
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Underlying C type is int.
Definition: opt.h:259
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:482
ff_bsf_get_packet_ref
int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
Called by bitstream filters to get packet for filtering.
Definition: bsf.c:256
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61