MPEG Audio Layer I
From Just Solve the File Format Problem
MPEG Audio Layer I, also known as MP1 (but not to be confused with MPEG-1), is a compressed audio format. There are two versions of it: MPEG-1 Audio Layer I and MPEG-2 Audio Layer I.
- ISO/IEC 11172-3:1993 - MPEG-1 Part 3 (not free to download)
- ISO/IEC 13818-3:1998 - MPEG-2 Part 3 (not free to download)