mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-16 08:38:00 +00:00
58 lines
1.4 KiB
TypeScript
58 lines
1.4 KiB
TypeScript
import { version } from "../version";
|
|
import { Context } from "./context/Context";
|
|
|
|
/**
|
|
* The global audio context which is getable and assignable through
|
|
* getContext and setContext
|
|
*/
|
|
let globalContext: Context;
|
|
|
|
// @ts-ignore
|
|
globalContext = window.TONE_CONTEXT;
|
|
|
|
/**
|
|
* Returns the default system-wide AudioContext
|
|
*/
|
|
export function getContext(): Context {
|
|
if (!globalContext) {
|
|
setContext(new Context());
|
|
}
|
|
return globalContext;
|
|
}
|
|
|
|
/**
|
|
* Set the default audio context
|
|
*/
|
|
export function setContext(context: Context): void {
|
|
globalContext = context;
|
|
context.initialize();
|
|
// @ts-ignore
|
|
window.TONE_CONTEXT = context;
|
|
}
|
|
|
|
/**
|
|
* Most browsers will not play _any_ audio until a user
|
|
* clicks something (like a play button). Invoke this method
|
|
* on a click or keypress event handler to start the audio context.
|
|
* More about the Autoplay policy
|
|
* [here](https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#webaudio)
|
|
* @example
|
|
* document.querySelector('#playbutton').addEventListener('click', () => Tone.start())
|
|
*/
|
|
export function start(): Promise <void> {
|
|
return globalContext.resume();
|
|
}
|
|
|
|
/**
|
|
* Log Tone.js + version in the console.
|
|
*/
|
|
if (!this.TONE_SILENCE_LOGGING) {
|
|
let prefix = "v";
|
|
// @ts-ignore
|
|
if (version === "dev") {
|
|
prefix = "";
|
|
}
|
|
const printString = ` * Tone.js ${prefix}${version} * `;
|
|
// tslint:disable-next-line: no-console
|
|
console.log(`%c${printString}`, "background: #000; color: #fff");
|
|
}
|