The createMediaStreamSource()
method of the AudioContext
Interface is used to create a new MediaStreamAudioSourceNode
object, given a media stream (say, from a MediaDevices.getUserMedia
instance), the audio from which can then be played and manipulated.
For more details about media stream audio source nodes, check out the MediaStreamAudioSourceNode
reference page.
Syntax
audioSourceNode = audioContext.createMediaStreamSource(stream);
Parameters
stream
- A
MediaStream
to serve as an audio source to be fed into an audio processing graph for use and manipulation.
Return value
A new MediaStreamAudioSourceNode
object representing the audio node whose media is obtained from the specified source stream.
Example
In this example, we grab a media (audio + video) stream from navigator.getUserMedia
, feed the media into a <video>
element to play then mute the audio, but then also feed the audio into a MediaStreamAudioSourceNode
. Next, we feed this source audio into a low pass BiquadFilterNode
(which effectively serves as a bass booster), then a AudioDestinationNode
.
The range slider below the <video>
element controls the amount of gain given to the lowpass filter — increase the value of the slider to make the audio sound more bass heavy!
Note: You can see this [[../../../../../../../mdn.github.io/webaudio-examples/stream-source-buffer/index|example running live]], or view the source.
var pre = document.querySelector('pre'); var video = document.querySelector('video'); var myScript = document.querySelector('script'); var range = document.querySelector('input'); // getUserMedia block - grab stream // put it into a MediaStreamAudioSourceNode // also output the visuals into a video element if (navigator.mediaDevices) { console.log('getUserMedia supported.'); navigator.mediaDevices.getUserMedia ({audio: true, video: true}) .then(function(stream) { video.srcObject = stream; video.onloadedmetadata = function(e) { video.play(); video.muted = true; }; // Create a MediaStreamAudioSourceNode // Feed the HTMLMediaElement into it var audioCtx = new AudioContext(); var source = audioCtx.createMediaStreamSource(stream); // Create a biquadfilter var biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.type = "lowshelf"; biquadFilter.frequency.value = 1000; biquadFilter.gain.value = range.value; // connect the AudioBufferSourceNode to the gainNode // and the gainNode to the destination, so we can play the // music and adjust the volume using the mouse cursor source.connect(biquadFilter); biquadFilter.connect(audioCtx.destination); // Get new mouse pointer coordinates when mouse is moved // then set new gain value range.oninput = function() { biquadFilter.gain.value = range.value; } }) .catch(function(err) { console.log('The following gUM error occured: ' + err); }); } else { console.log('getUserMedia not supported on your browser!'); } // dump script to pre element pre.innerHTML = myScript.innerHTML;
Note: As a consequence of calling createMediaStreamSource()
, audio playback from the media stream will be re-routed into the processing graph of the AudioContext
. So playing/pausing the stream can still be done through the media element API and the player controls.
Specifications
Specification | Status | Comment |
Web Audio APIThe definition of 'AudioContext.createMediaStreamSource()' in that specification. | Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
createMediaStreamSource
|
Chrome
Full support 14 |
Edge
Full support 12 |
Firefox
Full support 25 |
IE
No support No |
Opera
Full support 15 |
Safari
Full support 6 |
WebView Android
Full support Yes |
Chrome Android
Full support 18 |
Firefox Android
Full support 26 |
Opera Android
Full support 14 |
Safari iOS
Full support Yes |
Samsung Internet Android
Full support 1.0 |
Legend
- Full support
- Full support
- No support
- No support
See also
AudioContext.createMediaStreamSource() by Mozilla Contributors is licensed under CC-BY-SA 2.5.