如何在Android中读取音频文件的时间样本？

Question

I want to write an app on Android to record snoring sounds of a sleeper and analyze it afterwards (ie, not in real-time) for signs of a medical condition called obstructive sleep apnea.

The Android devices I've experimented with have voice recorders that produce a file format called .3ga. I want to programmatically read in the audio file and look at the amplitude for each individual time-sample. Then I can analyze that for patterns. Would this be easier if I converted this to a different format, eg, MP3, and if so how can I do that programmatically?

I did a Google search on this and most of the hits seemed to be related to audio recording or playback which are unrelated to what I'm trying to do. I haven't coded anything yet because I don't know how to get started.

Answer 1

You are looking to do sample-based analysis on a raw audio signal, but the formats you mention are compressed. You will need to either deal with raw samples directly, or decompress the audio and then analyze.

Since you said you can do this work after-the-fact, why not upload to a server and analyze there?