45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
// EffectCraft audio output (AudioWorklet): plays interleaved stereo blocks posted by the page
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// (src/audio.rs feeds them from the preview mixdown). Running dry plays silence, reported back
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// as underrun frames.
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class EffectcraftOutput extends AudioWorkletProcessor {
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constructor() {
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super();
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this.queue = [];
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this.offset = 0;
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this.stopped = false;
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this.port.onmessage = (e) => {
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if (e.data === "stop") this.stopped = true;
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else this.queue.push(e.data);
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};
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}
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process(_inputs, outputs) {
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const out = outputs[0];
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const l = out[0];
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const r = out[1] ?? out[0];
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let i = 0;
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while (i < l.length && this.queue.length) {
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const b = this.queue[0];
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const n = Math.min(l.length - i, (b.length - this.offset) >> 1);
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for (let k = 0; k < n; k++) {
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l[i + k] = b[this.offset + 2 * k];
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r[i + k] = b[this.offset + 2 * k + 1];
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}
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i += n;
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this.offset += 2 * n;
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if (this.offset >= b.length) {
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this.queue.shift();
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this.offset = 0;
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}
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}
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if (i < l.length) {
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l.fill(0, i);
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r.fill(0, i);
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if (!this.stopped) this.port.postMessage({ underrun: l.length - i });
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}
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return !this.stopped;
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}
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}
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registerProcessor("effectcraft-output", EffectcraftOutput);
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