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/**
* @class ZeroOutputProcessor
* @extends AudioWorkletProcessor
*
* This processor accumulates the incoming buffer and send the buffered data
* to the main thread when it reaches the specified frame length. The processor
* only supports the single input.
*/
const kRenderQuantumFrames = 128;
class ZeroOutputProcessor extends AudioWorkletProcessor {
constructor(options) {
super();
this._framesRequested = options.processorOptions.bufferLength;
this._framesCaptured = 0;
this._buffer = [];
for (let i = 0; i < options.processorOptions.channeCount; ++i) {
this._buffer[i] = new Float32Array(this._framesRequested);
}
}
process(inputs) {
let input = inputs[0];
let startIndex = this._framesCaptured;
let endIndex = startIndex + kRenderQuantumFrames;
for (let i = 0; i < this._buffer.length; ++i) {
this._buffer[i].subarray(startIndex, endIndex).set(input[i]);
}
this._framesCaptured = endIndex;
if (this._framesCaptured >= this._framesRequested) {
this.port.postMessage({ capturedBuffer: this._buffer });
return false;
} else {
return true;
}
}
}
registerProcessor('zero-output-processor', ZeroOutputProcessor);
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