C programming expert to modify audio_hw.c

i would like to modified the audio_hw.c file in the HAL. to changed the open, close, and read, functions so that I can modify the audio data as it passes from the microphones to a saved file. It is called audio routing. You must fix the .c code and compile it as .so file. Please POST including the world HAL as reference. Only bidders that have the HAL name starting the bid will be counted and contacted. Others no.