Interplay ACMP

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Interplay ACMP is an audio compression file format used in some games from Interplay. The specific audio coding format is presently unknown but is suspected to be ACOMP.

Interplay ACMP Format

Multi-byte numbers are stored in big endian format.

bytes 0-19   Signature string: 'Interplay ACMP Data\x1A'
bytes 20-21  sample rate
bytes 22-23  unknown, always seems to be 0 and might be part of sample rate
byte  24     unknown, always seems to be 0x28
byte  25     unknown, always seems to be 0
bytes 26-29  possibly the size of decompressed audio
bytes 30..   suspected to be the encoded audio data

Games Using Interplay ACMP Files