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Fix audio worklets in safari #652

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Aug 22, 2021
Merged

Fix audio worklets in safari #652

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26 changes: 23 additions & 3 deletions src/platform/javascript/AlphaSynthAudioWorkletOutput.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -20,14 +20,31 @@ declare var AudioWorkletProcessor: {
new (options?: AudioWorkletNodeOptions): AudioWorkletProcessor;
};

// Bug 646: Safari 14.1 is buggy regarding audio worklets
// globalThis cannot be used to access registerProcessor or samplerate
// we need to really use them as globals
/**
* @target web
*/
declare var registerProcessor: any;
/**
* @target web
*/
declare var sampleRate: number;

/**
* This class implements a HTML5 Web Audio API based audio output device
* for alphaSynth using the modern Audio Worklets.
* @target web
*/
export class AlphaSynthWebWorklet {
private static _isRegistered = false;
public static init() {
(Environment.globalThis as any).registerProcessor(
if(AlphaSynthWebWorklet._isRegistered) {
return;
}
AlphaSynthWebWorklet._isRegistered = true;
registerProcessor(
'alphatab',
class AlphaSynthWebWorkletProcessor extends AudioWorkletProcessor {
public static readonly BufferSize: number = 4096;
Expand All @@ -41,9 +58,11 @@ export class AlphaSynthWebWorklet {
constructor(...args: any[]) {
super(...args);

Logger.info('WebAudio', 'creating processor');

this._bufferCount = Math.floor(
(AlphaSynthWebWorkletProcessor.TotalBufferTimeInMilliseconds *
Environment.globalThis.sampleRate) /
sampleRate) /
1000 /
AlphaSynthWebWorkletProcessor.BufferSize
);
Expand Down Expand Up @@ -77,6 +96,7 @@ export class AlphaSynthWebWorklet {
if (outputs.length !== 1 && outputs[0].length !== 2) {
return false;
}

let left: Float32Array = outputs[0][0];
let right: Float32Array = outputs[0][1];

Expand Down Expand Up @@ -160,7 +180,7 @@ export class AlphaSynthAudioWorkletOutput extends AlphaSynthWebAudioOutputBase {
this._worklet.connect(ctx!.destination);
},
reason => {
Logger.debug('WebAudio', `Audio Worklet creation failed: reason=${reason}`);
Logger.error('WebAudio', `Audio Worklet creation failed: reason=${reason}`);
}
);
}
Expand Down