Creative Voice File format

Creative Voice is an audio sound format created by Creative Labs.

Files usually have .VOC extension and are still supported by a few players like VLC or Audacity.

Format versions

Platform	VOC revision
Floppy	v1.10 (0x010A)
PC-CD	v1.20 (0x0114)

Header

Type	Size	Name	Comments
CHAR[]	19 bytes	Signature	"Creative Voice File"
UINT8	1 byte	EOF	0x1A used to abort printing of file
UINT16LE	2 bytes	First data block offset	Should be 26
UINT16	2 bytes	Version	Higher-order byte is major version, Lowest-order byte is the minor revision.
UINT16LE	2 bytes	Checksum	See below

Checksum is calculated using the version. The formula to verify it is:

CHECKSUM = (~VERSION + 0X1234) & 0xFFFF

Data blocks

Following the header are a series of data blocks.

Each block is identified by a 4 byte header:

• 1 byte for the block type identifier
• 3 bytes for the data size

The following blocks are supported on v1.10:

Block ID	Name
0x00	Termination
0x01	Sound data
0x02	Sound data continued
0x03	Silence
0x04	Marker
0x05	String
0x06	Loop start
0x07	Loop end

Termination

Termination is the data block the end of the file. It does not contain any extra data.

Sound data

Silence

Marker

String

Loop start

Loop end

Block marks the end of a loop. It does not contain any extra data.