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Commit c52e332b authored by Philippe Gorley's avatar Philippe Gorley Committed by Philippe Gorley
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audio: add audio meter 

Adds a signal that sends the linear RMS level for a given ring buffer.
The signal must be turned on via the API and can be turned off when
needed.

Adds an audio preview so the mic can be read. Call startAudioDevice and
stopAudioDevice to initialize and stop the audio layer.

Change-Id: I6a71ef87ee805a6d4bfa824fa901dd638e8cbd65
parent 53da9361
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