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Use quasi-logarithmic volume controls

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This commit significantly improves the usability of the volume controls
for controlling volume in a way that matches intuitively onto human
needs and loudness perception.

Using the third power of the volume is a good approximation of the
quasi-logarithmic psychoacoustic system, while being defined everywhere
and preserving the useful quality of 0% volume mapping onto gain 0.0.
The use of this exact mapping function is a prior art established by
e.g. PulseAudio, among many other programs.

Fixes #24488
This commit is contained in:
Niklas Haas
2022-06-25 02:10:17 +02:00
committed by John Preston
parent 5c3f15af41
commit 6096116526
1 changed files with 9 additions and 6 deletions
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Telegram/SourceFiles/media/audio/media_audio.cpp
+9 -6
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@@ -315,12 +315,15 @@ base::Observable<AudioMsgId> &Updated() {
// Thread: Any. Must be locked: AudioMutex.
float64 ComputeVolume(AudioMsgId::Type type) {
switch (type) {
case AudioMsgId::Type::Voice: return VolumeMultiplierAll;
case AudioMsgId::Type::Song: return VolumeMultiplierSong * mixer()->getSongVolume();
case AudioMsgId::Type::Video: return mixer()->getVideoVolume();
}
return 1.;
const auto gain = [&] {
switch (type) {
case AudioMsgId::Type::Voice: return VolumeMultiplierAll;
case AudioMsgId::Type::Song: return VolumeMultiplierSong * mixer()->getSongVolume();
case AudioMsgId::Type::Video: return mixer()->getVideoVolume();
}
return 1.;
}();
return gain * gain * gain;
}
Mixer *mixer() {