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/**
* Copyright (c) 2018 The xterm.js authors. All rights reserved.
* @license MIT
*/
import { IOptionsService } from 'common/services/Services';
import { ISoundService } from 'browser/services/Services';
export class SoundService implements ISoundService {
public serviceBrand: undefined;
private static _audioContext: AudioContext;
public static get audioContext(): AudioContext | null {
if (!SoundService._audioContext) {
const audioContextCtor: typeof AudioContext = (window as any).AudioContext || (window as any).webkitAudioContext;
if (!audioContextCtor) {
console.warn('Web Audio API is not supported by this browser. Consider upgrading to the latest version');
return null;
}
SoundService._audioContext = new audioContextCtor();
}
return SoundService._audioContext;
}
constructor(
@IOptionsService private _optionsService: IOptionsService
) {
}
public playBellSound(): void {
const ctx = SoundService.audioContext;
if (!ctx) {
return;
}
const bellAudioSource = ctx.createBufferSource();
ctx.decodeAudioData(this._base64ToArrayBuffer(this._removeMimeType(this._optionsService.rawOptions.bellSound)), (buffer) => {
bellAudioSource.buffer = buffer;
bellAudioSource.connect(ctx.destination);
bellAudioSource.start(0);
});
}
private _base64ToArrayBuffer(base64: string): ArrayBuffer {
const binaryString = window.atob(base64);
const len = binaryString.length;
const bytes = new Uint8Array(len);
for (let i = 0; i < len; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
private _removeMimeType(dataURI: string): string {
// Split the input to get the mime-type and the data itself
const splitUri = dataURI.split(',');
// Return only the data
return splitUri[1];
}
}
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