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MediaStreamAudioSourceNode: mediaStream property - Web APIs | MDN
A MediaStream
representing the stream which contains the
MediaStreamTrack
serving as the source of audio for the node.
The user agent uses the first audio track it finds on the specified
stream as the audio source for this node. However, there is no way to be certain which
track that will be on multi-track streams. If the specific track matters to you, or you
need to have access to the track itself, you should use a
MediaStreamTrackAudioSourceNode
instead.
const audioCtx = new window.AudioContext();
let options = {
mediaStream: stream,
};
let source = new MediaStreamAudioSourceNode(audioCtx, options);
console.log(source.mediaStream);