83 lines
1.9 KiB
TypeScript
83 lines
1.9 KiB
TypeScript
// Copyright 2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import * as log from '../logging/log';
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export type SoundOpts = {
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loop?: boolean;
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src: string;
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};
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export class Sound {
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static sounds = new Map();
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private readonly context = new AudioContext();
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private readonly loop: boolean;
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private node?: AudioBufferSourceNode;
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private readonly src: string;
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constructor(options: SoundOpts) {
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this.loop = Boolean(options.loop);
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this.src = options.src;
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}
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async play(): Promise<void> {
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if (!Sound.sounds.has(this.src)) {
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try {
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const buffer = await Sound.loadSoundFile(this.src);
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const decodedBuffer = await this.context.decodeAudioData(buffer);
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Sound.sounds.set(this.src, decodedBuffer);
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} catch (err) {
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log.error(`Sound error: ${err}`);
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return;
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}
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}
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const soundBuffer = Sound.sounds.get(this.src);
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const soundNode = this.context.createBufferSource();
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soundNode.buffer = soundBuffer;
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const volumeNode = this.context.createGain();
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soundNode.connect(volumeNode);
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volumeNode.connect(this.context.destination);
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soundNode.loop = this.loop;
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soundNode.start(0, 0);
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this.node = soundNode;
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}
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stop(): void {
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if (this.node) {
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this.node.stop(0);
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this.node = undefined;
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}
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}
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static async loadSoundFile(src: string): Promise<ArrayBuffer> {
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const xhr = new XMLHttpRequest();
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xhr.open('GET', src, true);
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xhr.responseType = 'arraybuffer';
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return new Promise((resolve, reject) => {
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xhr.onload = () => {
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if (xhr.status === 200) {
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resolve(xhr.response);
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return;
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}
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reject(new Error(`Request failed: ${xhr.statusText}`));
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};
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xhr.onerror = () => {
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reject(new Error(`Request failed, most likely file not found: ${src}`));
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};
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xhr.send();
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});
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}
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}
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