Codex
103 lines
3.1 KiB
JavaScript
103 lines
3.1 KiB
JavaScript
import { estimateSceneMix, MAX_MIX_WORKING_BYTES } from "/packages/acoustics-core/mixdown.js";
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export function createAudioRuntime() {
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let worker = null;
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let rejectWorker = null;
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let playbackContext = null;
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let playbackSource = null;
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function cancelMix() {
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if (!worker) return false;
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worker.terminate();
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worker = null;
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const reject = rejectWorker;
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rejectWorker = null;
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reject?.(new DOMException("사용자가 mix 생성을 취소했습니다.", "AbortError"));
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return true;
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}
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function renderMix(scene, assetBuffers) {
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if (worker) throw new Error("이미 확인용 mix를 만들고 있습니다.");
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const estimate = estimateSceneMix(scene, assetBuffers);
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const crossThreadBytes = estimate.workingBytes + estimate.assetBytes;
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if (crossThreadBytes > MAX_MIX_WORKING_BYTES) {
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throw new Error(
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`decode buffer와 Worker 복사본을 포함한 예상 메모리 ${(crossThreadBytes / 1024 ** 2).toFixed(1)} MiB가 ` +
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`${(MAX_MIX_WORKING_BYTES / 1024 ** 2).toFixed(0)} MiB 한도를 넘습니다.`,
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);
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}
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return new Promise((resolve, reject) => {
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const currentWorker = new Worker("/apps/dataset-builder/mix-worker.js", { type: "module" });
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worker = currentWorker;
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rejectWorker = reject;
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currentWorker.addEventListener("message", ({ data }) => {
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if (worker !== currentWorker) return;
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worker = null;
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rejectWorker = null;
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currentWorker.terminate();
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if (data.ok) resolve(data.result);
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else reject(new Error(data.message));
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});
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currentWorker.addEventListener("error", (event) => {
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if (worker !== currentWorker) return;
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worker = null;
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rejectWorker = null;
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currentWorker.terminate();
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reject(new Error(event.message || "mix Worker가 중단되었습니다."));
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});
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currentWorker.postMessage({ scene, assetBuffers: [...assetBuffers] });
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});
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}
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function stopPlayback() {
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if (!playbackSource) return false;
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playbackSource.onended = null;
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try {
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playbackSource.stop();
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} catch {
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// 이미 끝난 source는 정리만 한다.
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}
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playbackSource.disconnect();
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playbackSource = null;
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return true;
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}
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async function play(result, onEnded) {
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stopPlayback();
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playbackContext ??= new AudioContext();
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await playbackContext.resume();
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const buffer = playbackContext.createBuffer(1, result.samples.length, result.sampleRate);
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buffer.copyToChannel(result.samples, 0);
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playbackSource = playbackContext.createBufferSource();
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playbackSource.buffer = buffer;
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playbackSource.connect(playbackContext.destination);
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playbackSource.onended = () => {
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playbackSource?.disconnect();
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playbackSource = null;
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onEnded?.();
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};
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playbackSource.start();
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}
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function dispose() {
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cancelMix();
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stopPlayback();
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playbackContext?.close();
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playbackContext = null;
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}
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return {
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cancelMix,
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dispose,
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get isMixing() {
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return Boolean(worker);
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},
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get isPlaying() {
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return Boolean(playbackSource);
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},
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play,
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renderMix,
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stopPlayback,
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};
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}
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