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lavc/bsf: add an Opus metadata bitstream filter

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The only adjustable field is the gain. Some ripping/transcoding programs
have started to use it.
This commit is contained in:
Lynne 2020-05-03 21:17:33 +01:00
parent 30f5d67510
commit bdd57e2a37
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GPG Key ID: A2FEA5F03F034464
3 changed files with 74 additions and 0 deletions
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1
libavcodec/Makefile
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@ -1116,6 +1116,7 @@ OBJS-$(CONFIG_MP3_HEADER_DECOMPRESS_BSF) += mp3_header_decompress_bsf.o \
OBJS-$(CONFIG_MPEG2_METADATA_BSF) += mpeg2_metadata_bsf.o
OBJS-$(CONFIG_NOISE_BSF) += noise_bsf.o
OBJS-$(CONFIG_NULL_BSF) += null_bsf.o
OBJS-$(CONFIG_OPUS_METADATA_BSF) += opus_metadata_bsf.o
OBJS-$(CONFIG_PRORES_METADATA_BSF) += prores_metadata_bsf.o
OBJS-$(CONFIG_REMOVE_EXTRADATA_BSF) += remove_extradata_bsf.o
OBJS-$(CONFIG_TEXT2MOVSUB_BSF) += movsub_bsf.o

1
libavcodec/bitstream_filters.c
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@ -49,6 +49,7 @@ extern const AVBitStreamFilter ff_mpeg4_unpack_bframes_bsf;
extern const AVBitStreamFilter ff_mov2textsub_bsf;
extern const AVBitStreamFilter ff_noise_bsf;
extern const AVBitStreamFilter ff_null_bsf;
extern const AVBitStreamFilter ff_opus_metadata_bsf;
extern const AVBitStreamFilter ff_prores_metadata_bsf;
extern const AVBitStreamFilter ff_remove_extradata_bsf;
extern const AVBitStreamFilter ff_text2movsub_bsf;

72
libavcodec/opus_metadata_bsf.c Normal file
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@ -0,0 +1,72 @@
/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "bsf.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
typedef struct OpusBSFContext {
const AVClass *class;
int gain;
} OpusBSFContext;
static int opus_metadata_filter(AVBSFContext *bsfc, AVPacket *pkt)
{
return ff_bsf_get_packet_ref(bsfc, pkt);
}
static int opus_metadata_init(AVBSFContext *bsfc)
{
OpusBSFContext *s = bsfc->priv_data;
if (bsfc->par_out->extradata_size < 19)
return AVERROR_INVALIDDATA;
AV_WL16(bsfc->par_out->extradata + 16, s->gain);
return 0;
}
#define OFFSET(x) offsetof(OpusBSFContext, x)
#define FLAGS (AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM)
static const AVOption opus_metadata_options[] = {
{ "gain", "Gain, actual amplification is pow(10, gain/(20.0*256))", OFFSET(gain),
AV_OPT_TYPE_INT, { .i64 = 0 }, -(INT16_MAX + 1), INT16_MAX, .flags = FLAGS },
{ NULL },
};
static const AVClass opus_metadata_class = {
.class_name = "opus_metadata_bsf",
.item_name = av_default_item_name,
.option = opus_metadata_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const enum AVCodecID codec_ids[] = {
AV_CODEC_ID_OPUS, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_opus_metadata_bsf = {
.name = "opus_metadata",
.priv_data_size = sizeof(OpusBSFContext),
.priv_class = &opus_metadata_class,
.init = &opus_metadata_init,
.filter = &opus_metadata_filter,
.codec_ids = codec_ids,
};