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Support compatibility points for Safari

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Tested on MacOS Big Sur, Safari 14.0.3
This commit is contained in:
Travis Ralston 2021-05-06 21:38:48 -06:00
parent b61fe2f8e6
commit b08e47bfe1
4 changed files with 155 additions and 25 deletions
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3
src/@types/global.d.ts vendored
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@ -52,6 +52,9 @@ declare global {
init: () => Promise<void>;
};
// Needed for Safari, unknown to TypeScript
webkitAudioContext: typeof AudioContext;
mxContentMessages: ContentMessages;
mxToastStore: ToastStore;
mxDeviceListener: DeviceListener;

21
src/voice/Playback.ts
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@ -21,6 +21,7 @@ import {SimpleObservable} from "matrix-widget-api";
import {IDestroyable} from "../utils/IDestroyable";
import {PlaybackClock} from "./PlaybackClock";
import {clamp} from "../utils/numbers";
import {createAudioContext, decodeOgg} from "./compat";
export enum PlaybackState {
Decoding = "decoding",
@ -49,7 +50,7 @@ export class Playback extends EventEmitter implements IDestroyable {
*/
constructor(private buf: ArrayBuffer, seedWaveform = DEFAULT_WAVEFORM) {
super();
this.context = new AudioContext();
this.context = createAudioContext();
this.resampledWaveform = arrayFastResample(seedWaveform ?? DEFAULT_WAVEFORM, PLAYBACK_WAVEFORM_SAMPLES);
this.waveformObservable.update(this.resampledWaveform);
this.clock = new PlaybackClock(this.context);
@ -91,7 +92,23 @@ export class Playback extends EventEmitter implements IDestroyable {
}
public async prepare() {
this.audioBuf = await this.context.decodeAudioData(this.buf);
// Safari compat: promise API not supported on this function
this.audioBuf = await new Promise((resolve, reject) => {
this.context.decodeAudioData(this.buf, b => resolve(b), async e => {
// This error handler is largely for Safari as well, which doesn't support Opus/Ogg
// very well.
console.error("Error decoding recording: ", e);
console.warn("Trying to re-encode to WAV instead...");
const wav = await decodeOgg(this.buf);
// noinspection ES6MissingAwait - not needed when using callbacks
this.context.decodeAudioData(wav, b => resolve(b), e => {
console.error("Still failed to decode recording: ", e);
reject(e);
});
});
});
// Update the waveform to the real waveform once we have channel data to use. We don't
// exactly trust the user-provided waveform to be accurate...

44
src/voice/VoiceRecording.ts
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@ -19,16 +19,17 @@ import encoderPath from 'opus-recorder/dist/encoderWorker.min.js';
import {MatrixClient} from "matrix-js-sdk/src/client";
import CallMediaHandler from "../CallMediaHandler";
import {SimpleObservable} from "matrix-widget-api";
import {clamp} from "../utils/numbers";
import {clamp, percentageOf, percentageWithin} from "../utils/numbers";
import EventEmitter from "events";
import {IDestroyable} from "../utils/IDestroyable";
import {Singleflight} from "../utils/Singleflight";
import {PayloadEvent, WORKLET_NAME} from "./consts";
import {UPDATE_EVENT} from "../stores/AsyncStore";
import {Playback} from "./Playback";
import {createAudioContext} from "./compat";
const CHANNELS = 1; // stereo isn't important
const SAMPLE_RATE = 48000; // 48khz is what WebRTC uses. 12khz is where we lose quality.
export const SAMPLE_RATE = 48000; // 48khz is what WebRTC uses. 12khz is where we lose quality.
const BITRATE = 24000; // 24kbps is pretty high quality for our use case in opus.
const TARGET_MAX_LENGTH = 120; // 2 minutes in seconds. Somewhat arbitrary, though longer == larger files.
const TARGET_WARN_TIME_LEFT = 10; // 10 seconds, also somewhat arbitrary.
@ -55,6 +56,7 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
private recorderStream: MediaStream;
private recorderFFT: AnalyserNode;
private recorderWorklet: AudioWorkletNode;
private recorderProcessor: ScriptProcessorNode;
private buffer = new Uint8Array(0); // use this.audioBuffer to access
private mxc: string;
private recording = false;
@ -98,7 +100,7 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
deviceId: CallMediaHandler.getAudioInput(),
},
});
this.recorderContext = new AudioContext({
this.recorderContext = createAudioContext({
// latencyHint: "interactive", // we don't want a latency hint (this causes data smoothing)
});
this.recorderSource = this.recorderContext.createMediaStreamSource(this.recorderStream);
@ -118,11 +120,13 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
// noinspection ExceptionCaughtLocallyJS
throw new Error("Unable to create recorder: no worklet script registered");
}
await this.recorderContext.audioWorklet.addModule(mxRecorderWorkletPath);
this.recorderWorklet = new AudioWorkletNode(this.recorderContext, WORKLET_NAME);
// Connect our inputs and outputs
this.recorderSource.connect(this.recorderFFT);
if (this.recorderContext.audioWorklet) {
await this.recorderContext.audioWorklet.addModule(mxRecorderWorkletPath);
this.recorderWorklet = new AudioWorkletNode(this.recorderContext, WORKLET_NAME);
this.recorderSource.connect(this.recorderWorklet);
this.recorderWorklet.connect(this.recorderContext.destination);
@ -140,6 +144,14 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
break;
}
};
} else {
// Safari fallback: use a processor node instead, buffered to 1024 bytes of data
// like the worklet is.
this.recorderProcessor = this.recorderContext.createScriptProcessor(1024, CHANNELS, CHANNELS);
this.recorderSource.connect(this.recorderProcessor);
this.recorderProcessor.connect(this.recorderContext.destination);
this.recorderProcessor.addEventListener("audioprocess", this.onAudioProcess);
}
this.recorder = new Recorder({
encoderPath, // magic from webpack
@ -209,6 +221,13 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
return this.mxc;
}
private onAudioProcess = (ev: AudioProcessingEvent) => {
this.processAudioUpdate(ev.playbackTime);
// We skip the functionality of the worklet regarding waveform calculations: we
// should get that information pretty quick during the playback info.
};
private processAudioUpdate = (timeSeconds: number) => {
if (!this.recording) return;
@ -216,7 +235,16 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
// size. The time domain is also known as the audio waveform. We're ignoring the
// output of the FFT here (frequency data) because we're not interested in it.
const data = new Float32Array(this.recorderFFT.fftSize);
if (!this.recorderFFT.getFloatTimeDomainData) {
// Safari compat
const data2 = new Uint8Array(this.recorderFFT.fftSize);
this.recorderFFT.getByteTimeDomainData(data2);
for (let i = 0; i < data2.length; i++) {
data[i] = percentageWithin(percentageOf(data2[i], 0, 256), -1, 1);
}
} else {
this.recorderFFT.getFloatTimeDomainData(data);
}
// We can't just `Array.from()` the array because we're dealing with 32bit floats
// and the built-in function won't consider that when converting between numbers.
@ -287,7 +315,11 @@ export class VoiceRecording extends EventEmitter implements IDestroyable {
// Disconnect the source early to start shutting down resources
await this.recorder.stop(); // stop first to flush the last frame
this.recorderSource.disconnect();
this.recorderWorklet.disconnect();
if (this.recorderWorklet) this.recorderWorklet.disconnect();
if (this.recorderProcessor) {
this.recorderProcessor.disconnect();
this.recorderProcessor.removeEventListener("audioprocess", this.onAudioProcess);
}
// close the context after the recorder so the recorder doesn't try to
// connect anything to the context (this would generate a warning)

78
src/voice/compat.ts Normal file
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@ -0,0 +1,78 @@
/*
Copyright 2021 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import wavEncoderPath from 'opus-recorder/dist/waveWorker.min.js';
import decoderPath from 'opus-recorder/dist/decoderWorker.min.js';
import {SAMPLE_RATE} from "./VoiceRecording";
// @ts-ignore - we know that this is not a module. We're looking for a path.
import decoderWasmPath from 'opus-recorder/dist/decoderWorker.min.wasm';
export function createAudioContext(opts?: AudioContextOptions): AudioContext {
if (window.AudioContext) {
return new AudioContext(opts);
} else if (window.webkitAudioContext) {
return new window.webkitAudioContext(opts);
} else {
throw new Error("Unsupported browser");
}
}
export function decodeOgg(audioBuffer: ArrayBuffer): Promise<ArrayBuffer> {
// Condensed version of decoder example, using a promise:
// https://github.com/chris-rudmin/opus-recorder/blob/master/example/decoder.html
return new Promise((resolve) => { // no reject because the workers don't seem to have a fail path
console.log("Decoder WASM path: " + decoderWasmPath); // so we use the variable (avoid tree shake)
const typedArray = new Uint8Array(audioBuffer);
const decoderWorker = new Worker(decoderPath);
const wavWorker = new Worker(wavEncoderPath);
decoderWorker.postMessage({
command: 'init',
decoderSampleRate: SAMPLE_RATE,
outputBufferSampleRate: SAMPLE_RATE,
});
wavWorker.postMessage({
command: 'init',
wavBitDepth: 24, // standard for 48khz (SAMPLE_RATE)
wavSampleRate: SAMPLE_RATE,
});
decoderWorker.onmessage = (ev) => {
if (ev.data === null) { // null == done
wavWorker.postMessage({command: 'done'});
return;
}
wavWorker.postMessage({
command: 'encode',
buffers: ev.data,
}, ev.data.map(b => b.buffer));
};
wavWorker.onmessage = (ev) => {
if (ev.data.message === 'page') {
// The encoding comes through as a single page
resolve(new Blob([ev.data.page], {type: "audio/wav"}).arrayBuffer());
}
};
decoderWorker.postMessage({
command: 'decode',
pages: typedArray,
}, [typedArray.buffer]);
});
}