147 lines
3.6 KiB
TypeScript
147 lines
3.6 KiB
TypeScript
// Copyright 2016-2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { requestMicrophonePermissions } from '../util/requestMicrophonePermissions';
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import * as log from '../logging/log';
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import type { WebAudioRecorderClass } from '../window.d';
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export class RecorderClass {
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private context?: AudioContext;
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private input?: GainNode;
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private recorder?: WebAudioRecorderClass;
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private source?: MediaStreamAudioSourceNode;
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private stream?: MediaStream;
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private blob?: Blob;
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private resolve?: (blob: Blob) => void;
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clear(): void {
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this.blob = undefined;
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this.resolve = undefined;
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if (this.source) {
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this.source.disconnect();
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this.source = undefined;
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}
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if (this.recorder) {
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if (this.recorder.isRecording()) {
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this.recorder.cancelRecording();
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}
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// Reach in and terminate the web worker used by WebAudioRecorder, otherwise
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// it gets leaked due to a reference cycle with its onmessage listener
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this.recorder.worker.terminate();
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this.recorder = undefined;
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}
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this.input = undefined;
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this.stream = undefined;
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if (this.context) {
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this.context.close();
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this.context = undefined;
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}
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}
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async start(): Promise<boolean> {
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const hasMicrophonePermission = await requestMicrophonePermissions();
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if (!hasMicrophonePermission) {
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log.info(
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'Recorder/start: Microphone permission was denied, new audio recording not allowed.'
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);
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return false;
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}
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this.clear();
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this.context = new AudioContext();
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this.input = this.context.createGain();
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this.recorder = new window.WebAudioRecorder(this.input, {
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encoding: 'mp3',
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workerDir: 'js/', // must end with slash
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options: {
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timeLimit: 360, // one minute more than our UI-imposed limit
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},
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});
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this.recorder.onComplete = this.onComplete.bind(this);
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this.recorder.onError = this.onError.bind(this);
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try {
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const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
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if (!this.context || !this.input) {
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const err = new Error(
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'Recorder/getUserMedia/stream: Missing context or input!'
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);
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this.onError(this.recorder, err);
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throw err;
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}
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this.source = this.context.createMediaStreamSource(stream);
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this.source.connect(this.input);
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this.stream = stream;
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} catch (err) {
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log.error(
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'Recorder.onGetUserMediaError:',
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err && err.stack ? err.stack : err
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);
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this.clear();
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throw err;
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}
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if (this.recorder) {
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this.recorder.startRecording();
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return true;
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}
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return false;
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}
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async stop(): Promise<Blob | undefined> {
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if (!this.recorder) {
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log.warn('Recorder/stop: Called with no recorder');
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return;
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}
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if (this.stream) {
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this.stream.getTracks().forEach(track => track.stop());
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}
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if (this.blob) {
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return this.blob;
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}
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const promise = new Promise<Blob>(resolve => {
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this.resolve = resolve;
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});
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this.recorder.finishRecording();
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return promise;
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}
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onComplete(_recorder: WebAudioRecorderClass, blob: Blob): void {
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this.blob = blob;
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this.resolve?.(blob);
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}
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onError(_recorder: WebAudioRecorderClass, error: Error): void {
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if (!this.recorder) {
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log.warn('Recorder/onError: Called with no recorder');
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return;
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}
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this.clear();
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log.error('Recorder/onError:', error && error.stack ? error.stack : error);
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}
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getBlob(): Blob {
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if (!this.blob) {
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throw new Error('no blob found');
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}
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return this.blob;
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}
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}
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export const recorder = new RecorderClass();
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