Create stream from audio file

The use case is this, in Android (above Kit Kat): open a stream from an audio file, get its properties, modify the memory buffer and play the result. I would like to know how to 1) properly create the stream from the audio file; 2) get its properties (channels, encoding, length) like for the javax.sound.sampled.AudioFormat, but using methods from the android.media framework. I know how to build a stream from binary, add audio properties to it then playing it. I would like to do the other way and extract these properties (channels, encoding) from the existing sound file header, using latest classes of the Android framework. Thanks!