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https://github.com/FFmpeg/FFmpeg.git
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bdd57e2a37
The only adjustable field is the gain. Some ripping/transcoding programs have started to use it.
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "bsf.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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typedef struct OpusBSFContext {
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const AVClass *class;
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int gain;
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} OpusBSFContext;
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static int opus_metadata_filter(AVBSFContext *bsfc, AVPacket *pkt)
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{
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return ff_bsf_get_packet_ref(bsfc, pkt);
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}
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static int opus_metadata_init(AVBSFContext *bsfc)
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{
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OpusBSFContext *s = bsfc->priv_data;
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if (bsfc->par_out->extradata_size < 19)
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return AVERROR_INVALIDDATA;
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AV_WL16(bsfc->par_out->extradata + 16, s->gain);
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return 0;
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}
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#define OFFSET(x) offsetof(OpusBSFContext, x)
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#define FLAGS (AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_BSF_PARAM)
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static const AVOption opus_metadata_options[] = {
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{ "gain", "Gain, actual amplification is pow(10, gain/(20.0*256))", OFFSET(gain),
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AV_OPT_TYPE_INT, { .i64 = 0 }, -(INT16_MAX + 1), INT16_MAX, .flags = FLAGS },
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{ NULL },
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};
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static const AVClass opus_metadata_class = {
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.class_name = "opus_metadata_bsf",
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.item_name = av_default_item_name,
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.option = opus_metadata_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_OPUS, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_opus_metadata_bsf = {
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.name = "opus_metadata",
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.priv_data_size = sizeof(OpusBSFContext),
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.priv_class = &opus_metadata_class,
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.init = &opus_metadata_init,
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.filter = &opus_metadata_filter,
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.codec_ids = codec_ids,
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};
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