FFmpeg
opus_metadata_bsf.c
Go to the documentation of this file.
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  .name = "opus_metadata",
63  .priv_data_size = sizeof(OpusBSFContext),
64  .priv_class = &opus_metadata_class,
68 };
OpusBSFContext::gain
int gain
Definition: opus_metadata_bsf.c:26
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
opt.h
bsf_internal.h
codec_ids
static enum AVCodecID codec_ids[]
Definition: opus_metadata_bsf.c:57
AVBitStreamFilter::name
const char * name
Definition: bsf.h:99
AVOption
AVOption.
Definition: opt.h:247
opus_metadata_init
static int opus_metadata_init(AVBSFContext *bsfc)
Definition: opus_metadata_bsf.c:29
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
ff_opus_metadata_bsf
const AVBitStreamFilter ff_opus_metadata_bsf
Definition: opus_metadata_bsf.c:61
AVBSFContext
The bitstream filter state.
Definition: bsf.h:49
bsf.h
AVBSFContext::par_out
AVCodecParameters * par_out
Parameters of the output stream.
Definition: bsf.h:83
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
FLAGS
#define FLAGS
Definition: opus_metadata_bsf.c:42
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
NULL
#define NULL
Definition: coverity.c:32
OpusBSFContext
Definition: opus_metadata_bsf.c:24
opus_metadata_options
static const AVOption opus_metadata_options[]
Definition: opus_metadata_bsf.c:43
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
AVCodecID
AVCodecID
Identify the syntax and semantics of the bitstream.
Definition: codec_id.h:47
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
OFFSET
#define OFFSET(x)
Definition: opus_metadata_bsf.c:41
AV_CODEC_ID_OPUS
@ AV_CODEC_ID_OPUS
Definition: codec_id.h:482
AV_WL16
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
opus_metadata_class
static const AVClass opus_metadata_class
Definition: opus_metadata_bsf.c:50
AVBSFContext::priv_data
void * priv_data
Opaque filter-specific private data.
Definition: bsf.h:70
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
AVBitStreamFilter
Definition: bsf.h:98
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:224
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
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:250
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59