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demux: add support for r128 replaygain tags

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datasone 2022-04-20 21:56:51 +08:00 committed by Dudemanguy
parent 05f0ff304e
commit ee62a1a56e
1 changed files with 13 additions and 0 deletions
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13
demux/demux.c
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@ -2942,6 +2942,19 @@ static struct replaygain_data *decode_rgain(struct mp_log *log,
return talloc_dup(NULL, &rg);
}
// The r128 replaygain tags declared in RFC 7845 for opus files. The tags
// are generated with EBU-R128, which does not use peak meters. And the
// values are stored as a Q7.8 fixed point number in dB.
if (decode_gain(log, tags, "R128_TRACK_GAIN", &rg.track_gain) >= 0) {
if (decode_gain(log, tags, "R128_ALBUM_GAIN", &rg.album_gain) < 0) {
// Album gain is undefined; fall back to track gain.
rg.album_gain = rg.track_gain;
}
rg.track_gain /= 256.;
rg.album_gain /= 256.;
return talloc_dup(NULL, &rg);
}
return NULL;
}