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window.currentNormalizationContext = null;
window.currentNormalizationContext2 = null;
window.currentNormalizationContext3 = null;
function normalizeAudio(ab, gainBoost, stella) {
ab = ab.slice(0);
return new Promise((res) => {
let currentNormalizationProfile = currentNormalizationContext.createGain();
if (localStorage.getItem("noamp") !== "true" && !stella) {
currentNormalizationProfile.gain.value = (1.0 + gainBoost) / 10.0 + 0.5;
} else {
currentNormalizationProfile.gain.value = (1.0 + gainBoost) / 10.0;
}
if (localStorage.getItem("normalize") === "false") res(currentNormalizationProfile);
currentNormalizationContext.decodeAudioData(ab).then(function(decodedData) {
let decodedBuffer = decodedData.getChannelData(0);
let sliceLen = Math.floor(decodedData.sampleRate * 0.05);
let averages = [];
let sum = 0.0;
for (let i = 0; i < decodedBuffer.length; i++) {
sum += decodedBuffer[i] ** 2;
if (i % sliceLen === 0) {
sum = Math.sqrt(sum / sliceLen);
averages.push(sum);
sum = 0;
}
}
averages.sort(function(a, b) { return a - b; });
let a = averages[Math.floor(averages.length * 0.95)];
let gain = (1.0 + gainBoost) / a;
gain = gain / 10.0;
console.log("Calculated gain:", gain);
if (localStorage.getItem("noamp") !== "true" && !stella) {
currentNormalizationProfile.gain.value = gain + 0.5;
} else {
currentNormalizationProfile.gain.value = gain;
}
res(currentNormalizationProfile);
});
});
}
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