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The createMediaStreamTrackSource()
method of the AudioContext
interface creates and returns a MediaStreamTrackAudioSourceNode
which represents an audio source whose data comes from the specified MediaStreamTrack
.
This differs from createMediaStreamSource()
, which creates a MediaStreamAudioSourceNode
whose audio comes from the audio track in a specified MediaStream
whose id
is first, lexicographically (alphabetically).
Syntax
var audioCtx = new AudioContext(); var track = audioCtx.createMediaStreamTrackSource(track);
Parameters
track
- The
MediaStreamTrack
to use as the source of all audio data for the new node.
Return value
A MediaStreamTrackAudioSourceNode
object which acts as a source for audio data found in the specified audio track.
Example
In this example, getUserMedia()
is used to request access to the user's microphone. Once that access is attained, an audio context is established and a MediaStreamTrackAudioSourceNode
is created using createMediaStreamTrackSource()
, taking its audio from the first audio track in the stream returned by getUserMedia()
.
Then a BiquadFilterNode
is created using createBiquadFilter()
, and it's configured as desired to perform a lowshelf filter on the audio coming from the source. The output from the microphone is then routed into the new biquad filter, and the filter's output is in turn routed to the audio context's destination
.
navigator.mediaDevices.getUserMedia ({audio: true, video: false}) .then(function(stream) { audio.srcObject = stream; audio.onloadedmetadata = function(e) { audio.play(); audio.muted = true; }; let audioCtx = new AudioContext(); let source = audioCtx.createMediaStreamSource(stream); let biquadFilter = audioCtx.createBiquadFilter(); biquadFilter.type = "lowshelf"; biquadFilter.frequency.value = 3000; biquadFilter.gain.value = 20; source.connect(biquadFilter); biquadFilter.connect(audioCtx.destination); }) .catch(function(err) { // Handle getUserMedia() error });
Specifications
Specification | Status | Comment |
---|---|---|
Web Audio API The definition of 'createMediaStreamTrackSource()' in that specification. |
Working Draft |
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
createMediaStreamTrackSource | Chrome No support No | Edge No support No | Firefox
Full support
68
| IE No support No | Opera No support No | Safari No support No | WebView Android No support No | Chrome Android No support No | Firefox Android
Full support
68
| Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No |
Legend
- Full support
- Full support
- No support
- No support
- See implementation notes.
- See implementation notes.
See also
- Web Audio API
- Using the Web Audio API
MediaStreamTrackAudioSource