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:346
FLAGS
#define FLAGS
Definition: opus_metadata.c:42
filter
filter_frame For filters that do not use the this method is called when a frame is pushed to the filter s input It can be called at any time except in a reentrant way If the input frame is enough to produce then the filter should push the output frames on the output link immediately As an exception to the previous rule if the input frame is enough to produce several output frames then the filter needs output only at least one per link The additional frames can be left buffered in the filter
Definition: filter_design.txt:228
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:66
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:365
AV_CODEC_ID_OPUS
@ AV_CODEC_ID_OPUS
Definition: codec_id.h:500
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:410
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:71
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:235
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