MediaStreamTrackAudioSourceNode()

The Web Audio API's MediaStreamTrackAudioSourceNode() constructor creates and returns a new MediaStreamTrackAudioSourceNode object whose audio is taken from the MediaStreamTrack specified in the given options object.

Another way to create a MediaStreamTrackAudioSourceNode is to call theAudioContext.createMediaStreamTrackSource() method, specifying the MediaStreamTrack  from which you want to obtain audio.

Syntax

audioTrackNode = new MediaStreamTrackAudioSourceNode(context, options);

Parameters

context
An AudioContext representing the audio context you want the node to be associated with.
options

A MediaStreamTrackAudioSourceOptions object defining the properties you want the MediaStreamTrackAudioSourceNode to have:

mediaStreamTrack
The MediaStreamTrack from which to take audio data for this node's output.

Return value

A new MediaStreamTrackAudioSourceNode object representing the audio node whose media is obtained from the specified media track.

Exceptions

NotSupportedError
The specified context is not an AudioContext.
InvalidStateError
The specified MediaStreamTrack isn't an audio track (that is, its kind property isn't audio.

Example

This example uses getUserMedia() to obtain access to the user's camera, then creates a new MediaStreamAudioSourceNode from the first audio track provided by the device.

let audioCtx = new (window.AudioContext || window.webkitAudioContext)();

if (navigator.mediaDevices.getUserMedia) {
  navigator.mediaDevices.getUserMedia (
    {
      audio: true,
      video: false
    }).then(function(stream) {
      let options = {
        mediaStreamTrack: stream.getAudioTracks()[0];
      }

      let source = new MediaStreamTrackAudioSourceNode(audioCtx, options);
      source.connect(audioCtx.destination);
    }).catch(function(err) {
      console.log('The following gUM error occured: ' + err);
    });
} else {
  console.log('new getUserMedia not supported on your browser!');
}

Specifications

Specification Status Comment
Web Audio API
The definition of 'MediaStreamTrackAudioSourceNode()' in that specification.
Working Draft

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
MediaStreamTrackAudioSourceNode() constructorChrome No support NoEdge No support NoFirefox Full support 68
Notes
Full support 68
Notes
Notes Firefox 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.
IE No support NoOpera No support NoSafari No support NoWebView Android No support NoChrome Android No support NoFirefox Android Full support 68
Notes
Full support 68
Notes
Notes Firefox 68 implements the updated standard's definition of the "first" audio track; now the first track is the one whose ID comes first lexicographically.
Opera Android No support NoSafari iOS No support NoSamsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
See implementation notes.
See implementation notes.

Document Tags and Contributors

Contributors to this page: Sheppy
Last updated by: Sheppy,