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I am developing VOIP Application on OSX and iOS and will be using AudioQueue for Audio flow, what want to Know is, by default does AudioQueue support acoustic echo cancellation or do we need to add support for it,
If we need to implement, i believe some open source library has to be implemented like Speex are there any Example available shows integration of AudioQueue with Speex or any other library
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The Acoustic Echo Cancellation (AEC) block is designed to remove echoes, reverberation, and unwanted added sounds from a signal that passes through an acoustic space.
The common and most straightforward solution for cancelling the echo signal in the presence of noise is to first independently apply an AEC between the loudspeaker and each of the microphones and then to apply a beamformer.
When it determines that the signal being sent out is the same signal that came in, it electronically cancels it so that the signal does not transmit back to the talker's loudspeakers, thus canceling the echo.
As far as I can find, you have to use Audio Units to access the system's echo cancellation. You do that by using kAudioUnitSubType_VoiceProcessingIO instead of kAudioUnitSubType_RemoteIO.
You probably want to use Audio Units anyway, in order to control your latency.
You can use a render callback function to get data from an Audio Queue and pass it to your I/O unit. For outgoing, use AudioUnitRender.
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