BNSF

BNSF (IS14, G.722.1) is an audio format used in some computer/video games. There are variants with different subcodecs.

Identification
The first four bytes are  (spellling BNSF in ASCII), and bytes 08-0B are   (spelling IS14). The bytes in between can vary.

Sample files

 * A sample is here

Links

 * Guide to Encoding .bnsf / .is14 audio files (converting .wav back to .bnsf / .is14)
 * BNSF IS14 format "failed opening"
 * Game File Analysis (audio)