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LibMedia: Add Linear Drop off to Volume scale

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Add Linear part to the logarithmic Volume scale that drops
it to Zero when it is lower than a certain point.
This commit is contained in:
SleakStick 2025-04-07 17:50:34 +02:00
parent 0a58497ab9
commit 74a00ed66a
1 changed files with 8 additions and 2 deletions
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10
Libraries/LibMedia/Audio/Sample.h
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@ -18,6 +18,8 @@ using AK::Exponentials::log;
constexpr float DYNAMIC_RANGE = 1000;
constexpr float VOLUME_A = 1 / DYNAMIC_RANGE;
float const VOLUME_B = log(DYNAMIC_RANGE);
float const VOLUME_CUTOFF = 0.1;
float const VOLUME_LINEAR_SLOPE = VOLUME_A * 10 * exp(0.1 * VOLUME_B);
// A single sample in an audio buffer.
// Values are floating point, and should range from -1.0 to +1.0
@ -80,13 +82,17 @@ struct Sample {
ALWAYS_INLINE float linear_to_log(float const change) const
{
// TODO: Add linear slope around 0
if (change < VOLUME_CUTOFF) {
return change * VOLUME_LINEAR_SLOPE;
}
return VOLUME_A * exp(VOLUME_B * change);
}
ALWAYS_INLINE float log_to_linear(float const val) const
{
// TODO: Add linear slope around 0
if (val / VOLUME_LINEAR_SLOPE < VOLUME_CUTOFF) {
return val / VOLUME_LINEAR_SLOPE;
}
return log(val / VOLUME_A) / VOLUME_B;
}