I'm digging up an old thread here, but I came across it while looking to do the 
same. 

In case you're still looking to do this, I found a solution using Web Audio, 
and posted about it here 
https://groups.google.com/forum/#!topic/discuss-webrtc/weTi7_ppwb4

John

On Tuesday, October 29, 2013 4:54:52 PM UTC, [email protected] wrote:
> ok, for anyone interested, the latest nightly is firing
> 
> iceConnectionState:connected before iceConnectionState:new (on my local
> 
> network).  Otherwise the peerConnection is behaving correctly.
> 
> 
> 
> Aurora behaves as expected.
> 
> 
> 
> Again, can anyone give me advice on reading the audioLevel using getStats?
> 
>  Please?
> 
> 
> 
> 
> 
> 
> 
> On Mon, Oct 28, 2013 at 5:16 PM, <[email protected]> wrote:
> 
> 
> 
> > correction, the state transition of the pc back to "new" is not related to
> 
> > calling getStats -- some other issue that I'm tracking down now.
> 
> >
> 
> > but I do need an example of reading the audio input level, please.
> 
> >
> 
> >
> 
> >
> 
> > On Mon, Oct 28, 2013 at 5:07 PM, <[email protected]> wrote:
> 
> >
> 
> >> I'm running the latest nightly and trying to use getStats to read the
> 
> >> microphone level on a connected pc.
> 
> >>
> 
> >> I call
> 
> >> pc.getStats(localStream.getAudioTracks[0],statsCallback,failCallback) to
> 
> >> get stats on the local audio stream but I have no idea how to read the
> 
> >> microphone volume.
> 
> >>
> 
> >> My statsCallback is invoked, I immediately return from the callback,then
> 
> >> the PC's iceConnectionState transitions from connected to new.  Very
> 
> >> strange behavior.
> 
> >>
> 
> >> If I never call getStats, then all is well.
> 
> >>
> 
> >> I see that https://bugzilla.mozilla.org/show_bug.cgi?id=902003 is
> 
> >> recently resolved / fixed, but I think it is not working.
> 
> >>
> 
> >> Is there an example of reading the microphone level?
> 
> >>
> 
> >
> 
> >
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