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https://github.com/chrisguttandin/angular-audio-context

An Angular wrapper for the Web Audio API's AudioContext.
https://github.com/chrisguttandin/angular-audio-context

angular audio ngx web-audio

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An Angular wrapper for the Web Audio API's AudioContext.

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# angular-audio-context



**An Angular wrapper for the Web Audio API's AudioContext.**



[![version](https://img.shields.io/npm/v/angular-audio-context.svg?style=flat-square)](https://www.npmjs.com/package/angular-audio-context)



Besides being a wrapper this module also patches the deprecated and prefixed versions of the

AudioContext which are out there. It uses the

[standardized-audio-context](https://github.com/chrisguttandin/standardized-audio-context) to do so.



## Usage



This module can be installed via [npm](https://www.npmjs.com/package/angular-audio-context) like

this:



```shell

npm install angular-audio-context

```



It provides an [Angular Module](https://angular.io/docs/ts/latest/guide/ngmodule.html) that can be

imported into your Angular app as usual.



```typescript

import { AudioContextModule } from 'angular-audio-context';



@NgModule({

    imports: [AudioContextModule.forRoot('balanced')]

})

export class AppModule {}

```



The `AudioContext` can then be injected into your components and services.



```typescript

import { Injectable } from '@angular/core';

import { AudioContext } from 'angular-audio-context';



@Injectable()

export class AnyService {

    constructor(private _audioContext: AudioContext) {}

}

```



In addition to the `AudioContext`, this module also provides a function called `isSupported` which

returns a promise which either resolves to true or false depending on the currently used browser's

Web Audio API support. An example usage might look like this:



```typescript

import { Component, Inject } from '@angular/core';

import { isSupported } from 'angular-audio-context';



@Component({

    selector: 'any-component',

    template: 'Yeah, your browser is supported.'

})

export class AnyComponent {

    constructor(@Inject(isSupported) public isSupported) {}

}

```



In case you are missing a feature or found a bug please create a pull request or raise an issue.

Thanks.



## Example



The following component defintion shows how to implement a basic component which produces a beep each time the button inside the template gets clicked.



```typescript

import { Component } from '@angular/core';

import { AudioContext } from 'angular-audio-context';



@Component({

    selector: 'my-beep',

    template: 'beep'

})

export class BeepComponent {

    constructor(private _audioContext: AudioContext) {}



    public async beep(): void {

        if (this._audioContext.state === 'suspended') {

            await this._audioContext.resume();

        }



        const oscillatorNode = this._audioContext.createOscillator();



        oscillatorNode.onended = () => oscillatorNode.disconnect();

        oscillatorNode.connect(this._audioContext.destination);



        oscillatorNode.start();

        oscillatorNode.stop(this._audioContext.currentTime + 0.5);

    }

}

```



## Compatibility



Up to [version 5](https://github.com/chrisguttandin/angular-audio-context/releases/tag/v5.0.0) this

module was compatible with Angular 1.



## Alternatives



There is also module called [ngWebAudio](https://github.com/nehz/ngWebAudio) which tries to simplify

the buffering and playback of a single audio file by utilizing the Web Audio API.



[ng-web-apis/audio](https://github.com/ng-web-apis/audio) is a library which allows the Web Audio API to be used from within the templates.



## Acknowledgement



The naming of this module tries to align with the recommendations given in the

[Specification for reusable AngularJS components](https://github.com/angular/angular-component-spec).