Just use AudioHadwareAlsa.cpp file for doing that.This file directly interacts with ALSA lib to write data to the below hardware,but in this case you need to take care of synchronization issues which can come up and many other issues which you will come across.Because in this case audioflinger will not come into picture which takes care of your audio mixing and applying policies.
To use this file you should have some knowledge about usage of ALSA lib api's.
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