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decoder/opus: move formula to EbuR128ToReplayGain()

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This commit is contained in:
Max Kellermann 2020-10-16 18:32:30 +02:00
parent 78ee663660
commit 1db533c8cf
1 changed files with 12 additions and 7 deletions
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19
src/decoder/plugins/OpusDecoderPlugin.cxx
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@ -63,6 +63,17 @@ IsOpusTags(const ogg_packet &packet) noexcept
return packet.bytes >= 8 && memcmp(packet.packet, "OpusTags", 8) == 0;
}
/**
* Convert an EBU R128 value to ReplayGain.
*/
constexpr float
EbuR128ToReplayGain(float ebu_r128) noexcept
{
/* add 5dB to compensate for the different reference levels
between ReplayGain (89dB) and EBU R128 (-23 LUFS) */
return ebu_r128 + 5;
}
bool
mpd_opus_init([[maybe_unused]] const ConfigBlock &block)
{
@ -249,13 +260,7 @@ MPDOpusDecoder::HandleTags(const ogg_packet &packet)
{
ReplayGainInfo rgi;
rgi.Clear();
/**
* Add 5dB to compensate for the different
* reference levels between ReplayGain (89dB) and EBU R128 (-23 LUFS).
*/
rgi.track.gain = output_gain + 5;
rgi.album.gain = output_gain + 5;
rgi.track.gain = rgi.album.gain = EbuR128ToReplayGain(output_gain);
TagBuilder tag_builder;
AddTagHandler h(tag_builder);