It seems OpenMAX IL does not support controlling audio hardware (microphone and speaker).
But it will be great to take the hardware into the scope of OpenMAX IL. That will provide a unified interface to control all parts of audio.

Please just answer me: Which API of OpenMAX IL can be used to do the audio hardware control (audio hardware path selecting, gain setting, filter controlling.....)???

I see this message board is not very active. But I still wish somebody can spend one minute and share some ideas.

Thank you very very very very much.
--Kening