mirror/strudel
1
0
Fork 0
mirror of https://codeberg.org/uzu/strudel synced 2026-07-21 20:55:12 -04:00
Code Issues Packages Projects Releases Wiki Activity

Calculate global gain with a better approximation of human perceived loudness

Browse Source 
Taken from https://www.dr-lex.be/info-stuff/volumecontrols.html
This commit is contained in:
Martín (Netux) Rodríguez
2024-09-03 17:58:52 -03:00
parent afa55535ba
commit 5797c42753
1 changed files with 9 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
website/src/repl/util.mjs
+9 -3
View File
@@ -194,10 +194,16 @@ export const setAudioDevice = async (id) => {
initializeAudioOutput();
};
const NATURAL_LOG_10 = Math.log(1000);
const LOW_VOLUME_CONSTANT = Math.exp(0.1 * NATURAL_LOG_10);
export const setGlobalAudioVolume = (volume) => {
// Adjust user visible volume to a gain value in the range [0, 1]
// Pow is used to also adjust the volume to a logarithmic scale (as perceived by us humans)
const gain = Math.pow(volume / 100, 2);
// Gain is calculated to adjust the volume to a logarithmic scale to match how us humans perceive loudness.
// Formula is taken from https://www.dr-lex.be/info-stuff/volumecontrols.html
volume /= 100; // [0, 1]
let gain = volume >= 0.1 ? 0.001 * Math.exp(NATURAL_LOG_10 * volume) : volume * 10 * 0.001 * LOW_VOLUME_CONSTANT;
gain = Math.max(0, Math.min(gain, 1)); // just in case
setGlobalGain(gain);
};