48 lines
1.4 KiB
TypeScript
48 lines
1.4 KiB
TypeScript
declare global {
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interface AudioWorkletProcessor {
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readonly port: MessagePort;
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process(inputs: Float32Array[][], outputs: Float32Array[][], parameters: Map<string, Float32Array>): void;
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}
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const AudioWorkletProcessor: {
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prototype: AudioWorkletProcessor;
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new(options?: AudioWorkletNodeOptions): AudioWorkletProcessor;
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};
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function registerProcessor(name: string, ctor :{ new(): AudioWorkletProcessor; }): void
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}
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export class AppleAudioProcessor extends AudioWorkletProcessor {
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private samples: Float32Array[] = [];
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constructor() {
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super();
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console.info('AppleAudioProcessor constructor');
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this.port.onmessage = (ev: MessageEvent) => {
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this.samples.push(ev.data);
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if (this.samples.length > 256) {
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this.samples.shift();
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}
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};
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}
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static get parameterDescriptors() {
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return [];
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}
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process(_inputList: Float32Array[][], outputList: Float32Array[][], _parameters: Map<string, Float32Array>) {
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const sample = this.samples.shift();
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const output = outputList[0];
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if (sample) {
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for (let idx = 0; idx < sample.length; idx++) {
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output[0][idx] = sample[idx];
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}
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}
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// Keep alive indefinitely.
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return true;
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}
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}
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registerProcessor('audio_worker', AppleAudioProcessor);
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