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Fix random pitch upwards bias in AudioStreamRandomizer

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This commit is contained in:
Roy Berardo 2025-07-26 11:34:17 -07:00
parent 0dd9178269
commit 3e01c8a551
1 changed files with 6 additions and 3 deletions
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9
servers/audio/audio_stream.cpp
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@ -799,10 +799,13 @@ AudioStreamRandomizer::AudioStreamRandomizer() {
void AudioStreamPlaybackRandomizer::start(double p_from_pos) {
playing = playback;
{
float range_from = 1.0 / randomizer->random_pitch_scale;
float range_to = randomizer->random_pitch_scale;
// GH-10238 : Pitch_scale is multiplicative, so picking a random number for it without log
// conversion will bias it towards higher pitches (0.5 is down one octave, 2.0 is up one octave).
// See: https://pressbooks.pub/sound/chapter/pitch-and-frequency-in-music/
float range_from = Math::log(1.0f / randomizer->random_pitch_scale);
float range_to = Math::log(randomizer->random_pitch_scale);
pitch_scale = range_from + Math::randf() * (range_to - range_from);
pitch_scale = Math::exp(range_from + Math::randf() * (range_to - range_from));
}
{
float range_from = -randomizer->random_volume_offset_db;