Your IP : 216.73.216.224
const SMOOTHING_FACTOR = 0.98;
const MINIMUM_VALUE = 0.00001;
class JChatAudioWorkletProcessor extends AudioWorkletProcessor {
constructor () {
super();
this._volume = 0;
this._updateIntervalInMS = 25;
this._nextUpdateFrame = this._updateIntervalInMS;
this.port.onmessage = event => {
if (event.data.updateIntervalInMS)
this._updateIntervalInMS = event.data.updateIntervalInMS;
}
}
get intervalInFrames () {
return this._updateIntervalInMS / 1000 * sampleRate;
}
process (inputs, outputs, parameters) {
const input = inputs[0];
// Note that the input will be down-mixed to mono; however, if no inputs are
// connected then zero channels will be passed in.
if (input.length > 0) {
const samples = input[0];
let sum = 0;
let rms = 0;
// Calculated the squared-sum.
for (let i = 0; i < samples.length; ++i)
sum += samples[i] * samples[i];
// Calculate the RMS level and update the volume.
rms = Math.sqrt(sum / samples.length);
this._volume = Math.max(rms, this._volume * SMOOTHING_FACTOR);
// Update and sync the volume property with the main thread.
this._nextUpdateFrame -= samples.length;
if (this._nextUpdateFrame < 0) {
this._nextUpdateFrame += this.intervalInFrames;
this.port.postMessage({volume: this._volume});
}
}
return true;
}
};
registerProcessor('vumeter', JChatAudioWorkletProcessor);