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Clarify what happens when setting the audio volume (#9480)

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# Objective

- Fixes [#8835](https://github.com/bevyengine/bevy/issues/8835)

## Solution

- Added a note to the `set_volume` docstring which explains how volume
is interpreted.

---------

Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
Co-authored-by: GitGhillie <jillisnoordhoek@gmail.com>
Co-authored-by: François <mockersf@gmail.com>
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lelo 2023-08-28 14:21:12 -04:00 committed by GitHub
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crates/bevy_audio/src/sinks.rs
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@ -15,6 +15,14 @@ pub trait AudioSinkPlayback {
///
/// The value `1.0` is the "normal" volume (unfiltered input). Any value other than `1.0`
/// will multiply each sample by this value.
///
/// # Note on Audio Volume
///
/// An increase of 10 decibels (dB) roughly corresponds to the perceived volume doubling in intensity.
/// As this function scales not the volume but the amplitude, a conversion might be necessary.
/// For example, to halve the perceived volume you need to decrease the volume by 10 dB.
/// This corresponds to 20log(x) = -10dB, solving x = 10^(-10/20) = 0.316.
/// Multiply the current volume by 0.316 to halve the perceived volume.
fn set_volume(&self, volume: f32);
/// Gets the speed of the sound.