javascript - WebRTC: Get audio level of a mediaStream *without* playing back the audio - Stack Overflow

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I'm looking to get the microphone activity level of a WebRTC MediaStream. However, I need to get this information without playing back the microphone to the user (otherwise there will be the loopback effect).

The answer in Microphone activity level of WebRTC MediaStream relies on the audio being played back to the user. How can I do this, without playing back the microphone?

I'm looking to get the microphone activity level of a WebRTC MediaStream. However, I need to get this information without playing back the microphone to the user (otherwise there will be the loopback effect).

The answer in Microphone activity level of WebRTC MediaStream relies on the audio being played back to the user. How can I do this, without playing back the microphone?

• javascript
• audio
• webrtc

Share Improve this question Follow asked Jul 8, 2014 at 6:25 apscienceapscience 7,2831111 gold badges5757 silver badges8989 bronze badges 1

• No it does not? I just tested the code and the mediastream simply goes into the node and is never played back to the speakers. I believe you HAVE to do with with the AudioAPI and connecting it to a node is not playing the audio back... – Benjamin Trent Commented Jul 8, 2014 at 13:05

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1 Answer 1

Sorted by: Reset to default 7

Take a look at createGain method. It allows you to set stream's volume.

Here is my (simplified) example that I use in my project:

navigator.getUserMedia({audio: true, video: true}, function(stream) {
    var audioContext = new AudioContext; //or webkitAudioContext
    var source = audioContext.createMediaStreamSource(stream);

    var volume = audioContext.createGain();
    source.connect(volume);
    volume.connect(audioContext.destination);
    volume.gain.value = 0;  //turn off the speakers

    //further manipulations with source
}, function(err) {
    console.log('error', err);
});

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