mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 16:48:00 +00:00
66 lines
2 KiB
TypeScript
66 lines
2 KiB
TypeScript
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import { isUndef } from "./Util";
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/**
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* The global audio context which is getable and assignable through
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* getContext and setContext
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*/
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let globalContext: BaseAudioContext;
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/**
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* Returns the default system-wide AudioContext
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*/
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export function getContext(): BaseAudioContext {
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if (!globalContext) {
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globalContext = new AudioContext();
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}
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return globalContext;
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}
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/**
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* Set the default audio context
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*/
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export function setContext(context: BaseAudioContext): void {
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globalContext = context;
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}
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/**
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* Most browsers will not play _any_ audio until a user
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* clicks something (like a play button). Invoke this method
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* on a click or keypress event handler to start the audio context.
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* More about the Autoplay policy
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* [here](https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio)
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* @example
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* document.querySelector('#playbutton').addEventListener('click', () => Tone.start())
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*/
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export function start(): Promise < void> {
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return globalContext.resume();
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}
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/**
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* True if the current environment has the necessary APIs to run Tone.js
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*/
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// // export const supported: boolean = toneGlobal.hasOwnProperty("Promise") && toneGlobal.hasOwnProperty("AudioContext");
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// set the audio context initially, and if one is not already created
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// if (Tone.supported && !Tone.initialized){
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// if (!Tone.global.TONE_AUDIO_CONTEXT){
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// Tone.global.TONE_AUDIO_CONTEXT = new Context();
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// }
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// Tone.context = Tone.global.TONE_AUDIO_CONTEXT;
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// // log on first initialization
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// // allow optional silencing of this log
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// if (!Tone.global.TONE_SILENCE_LOGGING){
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// var prefix = "v";
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// if (Tone.version === "dev"){
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// prefix = "";
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// }
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// var printString = " * Tone.js " + prefix + Tone.version + " * ";
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// // eslint-disable-next-line no-console
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// console.log("%c" + printString, "background: #000; color: #fff");
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// }
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// } else if (!Tone.supported && !Tone.global.TONE_SILENCE_LOGGING){
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// // eslint-disable-next-line no-console
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// console.warn("This browser does not support Tone.js");
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// }
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