02dd79f03f
* Fix battery drain from Web Audio * move suspend away from constructor * await on resume() * Delint Signed-off-by: Michael Telatynski <7t3chguy@gmail.com> --------- Signed-off-by: Michael Telatynski <7t3chguy@gmail.com> Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>
89 lines
3.1 KiB
TypeScript
89 lines
3.1 KiB
TypeScript
/*
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Copyright 2024 New Vector Ltd.
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Copyright 2021 The Matrix.org Foundation C.I.C.
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SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
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Please see LICENSE files in the repository root for full details.
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*/
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// @ts-ignore - we know that this is not a module. We're looking for a path.
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import decoderWasmPath from "opus-recorder/dist/decoderWorker.min.wasm";
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import wavEncoderPath from "opus-recorder/dist/waveWorker.min.js";
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import decoderPath from "opus-recorder/dist/decoderWorker.min.js";
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import { logger } from "matrix-js-sdk/src/logger";
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import { SAMPLE_RATE } from "./VoiceRecording";
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export function createAudioContext(opts?: AudioContextOptions): AudioContext {
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let ctx: AudioContext;
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if (window.AudioContext) {
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ctx = new AudioContext(opts);
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} else if (window.webkitAudioContext) {
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// While the linter is correct that "a constructor name should not start with
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// a lowercase letter", it's also wrong to think that we have control over this.
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// eslint-disable-next-line new-cap
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ctx = new window.webkitAudioContext(opts);
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} else {
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throw new Error("Unsupported browser");
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}
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// Initialize in suspended state, as Firefox starts using
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// CPU/battery right away, even if we don't play any sound yet.
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void ctx.suspend();
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return ctx;
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}
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export function decodeOgg(audioBuffer: ArrayBuffer): Promise<ArrayBuffer> {
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// Condensed version of decoder example, using a promise:
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// https://github.com/chris-rudmin/opus-recorder/blob/master/example/decoder.html
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return new Promise((resolve) => {
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// no reject because the workers don't seem to have a fail path
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logger.log("Decoder WASM path: " + decoderWasmPath); // so we use the variable (avoid tree shake)
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const typedArray = new Uint8Array(audioBuffer);
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const decoderWorker = new Worker(decoderPath);
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const wavWorker = new Worker(wavEncoderPath);
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decoderWorker.postMessage({
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command: "init",
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decoderSampleRate: SAMPLE_RATE,
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outputBufferSampleRate: SAMPLE_RATE,
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});
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wavWorker.postMessage({
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command: "init",
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wavBitDepth: 24, // standard for 48khz (SAMPLE_RATE)
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wavSampleRate: SAMPLE_RATE,
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});
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decoderWorker.onmessage = (ev) => {
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if (ev.data === null) {
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// null == done
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wavWorker.postMessage({ command: "done" });
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return;
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}
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wavWorker.postMessage(
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{
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command: "encode",
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buffers: ev.data,
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},
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ev.data.map((b: Float32Array) => b.buffer),
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);
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};
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wavWorker.onmessage = (ev) => {
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if (ev.data.message === "page") {
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// The encoding comes through as a single page
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resolve(new Blob([ev.data.page], { type: "audio/wav" }).arrayBuffer());
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}
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};
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decoderWorker.postMessage(
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{
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command: "decode",
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pages: typedArray,
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},
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[typedArray.buffer],
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);
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});
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}
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