56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
class VoiceCaptureProcessor extends AudioWorkletProcessor {
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constructor() {
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super();
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this.pending = [];
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this.pendingLength = 0;
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this.flushSamples = Math.max(1024, Math.floor(sampleRate * 0.25));
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this.port.onmessage = (event) => {
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if (event.data && event.data.type === "flush") {
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this.flush();
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}
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};
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}
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process(inputs) {
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const input = inputs[0];
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const channel = input && input[0];
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if (!channel || channel.length === 0) return true;
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const pcm = new Int16Array(channel.length);
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for (let i = 0; i < channel.length; i += 1) {
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const sample = Math.max(-1, Math.min(1, channel[i]));
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pcm[i] = sample < 0 ? sample * 0x8000 : sample * 0x7fff;
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}
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this.pending.push(pcm);
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this.pendingLength += pcm.length;
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if (this.pendingLength >= this.flushSamples) {
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this.flush();
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}
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return true;
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}
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flush() {
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if (this.pendingLength <= 0) return;
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const merged = new Int16Array(this.pendingLength);
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let offset = 0;
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for (const chunk of this.pending) {
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merged.set(chunk, offset);
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offset += chunk.length;
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}
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this.pending = [];
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this.pendingLength = 0;
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this.port.postMessage(
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{
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type: "chunk",
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sampleRate,
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channels: 1,
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sampleWidth: 2,
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pcm: merged.buffer,
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},
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[merged.buffer],
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);
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}
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}
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registerProcessor("voice-capture-processor", VoiceCaptureProcessor);
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