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decoder/mpcdec: fix bogus ReplayGain values

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Apparently, libmpcdec sets gain/peak variables to zero if they are not
present.  This clashes with our formula and results in bogus values
which cause noise during playback.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/640
This commit is contained in:
Max Kellermann
2019-09-13 19:41:54 +02:00
parent 9270829b5b
commit 92495d2b0b
2 changed files with 9 additions and 3 deletions
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1
NEWS
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@@ -1,6 +1,7 @@
ver 0.21.15 (not yet released) ver 0.21.15 (not yet released)
* decoder * decoder
- dsdiff, dsf: fix displayed bit rate - dsdiff, dsf: fix displayed bit rate
- mpcdec: fix bogus ReplayGain values
* output * output
- solaris: fix build with glibc 2.30 - solaris: fix build with glibc 2.30

5
src/decoder/plugins/MpcdecDecoderPlugin.cxx
View File

@@ -141,8 +141,12 @@ static constexpr ReplayGainTuple
ImportMpcdecReplayGain(mpc_uint16_t gain, mpc_uint16_t peak) noexcept ImportMpcdecReplayGain(mpc_uint16_t gain, mpc_uint16_t peak) noexcept
{ {
auto t = ReplayGainTuple::Undefined(); auto t = ReplayGainTuple::Undefined();
if (gain != 0 && peak != 0) {
t.gain = MPC_OLD_GAIN_REF - (gain / 256.); t.gain = MPC_OLD_GAIN_REF - (gain / 256.);
t.peak = pow(10, peak / 256. / 20) / 32767; t.peak = pow(10, peak / 256. / 20) / 32767;
}
return t; return t;
} }
@@ -187,6 +191,7 @@ mpcdec_decode(DecoderClient &client, InputStream &is)
{ {
const auto rgi = ImportMpcdecReplayGain(info); const auto rgi = ImportMpcdecReplayGain(info);
if (rgi.IsDefined())
client.SubmitReplayGain(&rgi); client.SubmitReplayGain(&rgi);
} }