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Concedo 2025-07-19 23:36:51 +08:00
parent 1154c44a7f
commit ecaa653df6
1 changed files with 26 additions and 1 deletions
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@ -19095,7 +19095,32 @@ Current version indicated by LITEVER below.
const audioContext = new (window.AudioContext || window.webkitAudioContext)();
audioContext.decodeAudioData(arrayBuffer, function (buffer) {
const samplefreq = buffer.sampleRate;
const samples = buffer.getChannelData(0); // mono
const numberOfChannels = buffer.numberOfChannels;
const length = buffer.length;
//first, mix all down into mono
let samples = new Float32Array(length);
for (let channel = 0; channel < numberOfChannels; channel++) {
const channelData = buffer.getChannelData(channel);
for (let i = 0; i < length; i++) {
samples[i] += channelData[i];
}
}
for (let i = 0; i < length; i++) {
samples[i] /= numberOfChannels;
}
//handle extremely soft audio
let max = 0;
for (let i = 0; i < length; i++) {
const abs = Math.abs(samples[i]);
if (abs > max) max = abs;
}
if (max > 0 && max < 0.2) {
for (let i = 0; i < length; i++) {
samples[i] /= max;
samples[i] *= 0.2; //all super soft audio is bumped up to this
}
}
const durationInSeconds = buffer.duration;
const mp3encoder = new lamejs.Mp3Encoder(1, samplefreq, 40); // mono, 16kHz, 40kbps
const sampleBlockSize = 1152; //can be anything but make it a multiple of 576 to make encoders life easier