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Change: Apply power-of-3 scaling to master effect volume to improve perceived loudness change.

This commit is contained in:
Peter Nelson 2021-04-04 15:58:06 +01:00 committed by Charles Pigott
parent f0a24e98f5
commit 42fbdda9ab
1 changed files with 7 additions and 1 deletions
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8
src/mixer.cpp
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@ -155,7 +155,13 @@ void MxMixSamples(void *buffer, uint samples)
/* Fetch music if a sampled stream is available */
if (_music_stream) _music_stream((int16*)buffer, samples);
uint8 effect_vol = _settings_client.music.effect_vol;
/* Apply simple x^3 scaling to master effect volume. This increases the
* perceived difference in loudness to better match expectations. effect_vol
* is expected to be in the range 0-127 hence the division by 127 * 127 to
* get back into range. */
uint8 effect_vol = (_settings_client.music.effect_vol *
_settings_client.music.effect_vol *
_settings_client.music.effect_vol) / (127 * 127);
/* Mix each channel */
for (mc = _channels; mc != endof(_channels); mc++) {