title: understanding mixer_paths.xml in android
body: <p>I am currently learning the audio domain of android OS with qualcomm chipsets. I have come across mixer_paths.xml file. I have been trying to understand the convention of writing and modifying the files. But I am not able to find any proper documentation or guide explaining the convention followed. Can anyone let me know whether there is any such documentation available or else explain in brief the convention followed?</p>