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* Audio HAL: added echo referenceEric Laurent2011-07-251-0/+7
Added EchoReference class enabling the input stream to access the audio data written to the output stream and push it as echo reference to the AEC. Also added methods to calculate the echo delay. Moved ReSampler class to a separate source file. Change-Id: I9c3388f39101d567240545eab271eb61c97e7b56