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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);
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