Creative Voice
- Extension: voc
- Company: Creative
The VOC file format was created by Creative and is generally associated with their 8-bit line of cards (Sound Blaster, Sound Blaster Pro). While initially limited to unsigned 8-bit PCM and ADPCM data, the VOC format was eventually expanded to handle 16-bit formats with the introduction of Creative's 16-bit cards, as well as a-law and u-law companded formats.
This file format is composed of a file header followed by one or more data block. All integers are Little Endian.
Main header
bytes 0-18 Identifier string containing: Creative Voice File
byte 19 0x1A (EOF). This is belived to be used to abort printing of file
bytes 20-21 Total size of this main header (usually 0x001A)
bytes 22-23 Version number, calculated as (major<<8)|minor
major is usually 0x01
minor is usually 0x0A or 0x14
bytes 24-25 Validity check. This must be equal to ~version 0x1234
Data blocks
All the different data blocks begin with a common header:
byte 0 block type bytes 1-3 block size (NOT including this common header)
The data following this common block header depends on the block type.
Block type 0x00: Terminator
This is a special block type as it's common header don't contain any size field. It indicate the end of the file. It is not mandatory (you can reach EOF without encountering this block type).
Block type 0x01: Sound data
byte 0 frequency divisor byte 1 codec id bytes 2..n the audio data
The sample rate is defined as
1000000/(256 - frequency_divisor)
Block type 0x02: Sound data continuation
bytes 2..n the audio data
This block uses the same codec parameters as the previous "Sound data" block.
Block type 0x03: Silence
bytes 0-1 length of the silence - 1 (unit is sample) byte 2 frequency divisor
The sample rate is defined as
1000000/(256 - frequency_divisor)
Block type 0x04: Marker
bytes 0-1 the mark value
This can be used by the software to synchronize the sound with an animation.
Block type 0x05: Text
bytes 0..n zero terminated string
Block type 0x06: Repeat start
bytes 0-1 repeat count - 1
The sound data following this block and up to the next Repeat end block is repeated count 1 times. When count == 0xFFFF this means endless repetitions.
Block type 0x07: Repeat end
Empty block which terminate a repeat section.
Block type 0x08: Extra info
bytes 0-1 frequency divisor byte 2 codec id byte 3 channels number - 1
The sample rate is defined as
256000000/(nb_channels * (65536 - frequency_divisor))
This block must be followed by a "Sound data" block, and it supercedes its codec parameters.
Block type 0x09: Sound data (New format)
This block type is probably only valid in version 1.20 (0x0114) or greater files.
bytes 0-3 sample rate byte 4 bits per sample byte 5 channels number bytes 6-7 codec_id bytes 8-11 reserved bytes 12..n the audio data
Supported codec ids
0x00 8 bits unsigned PCM 0x01 4 bits to 8 bits Creative ADPCM 0x02 3 bits to 8 bits Creative ADPCM (AKA 2.6 bits) 0x03 2 bits to 8 bits Creative ADPCM 0x04 16 bits signed PCM 0x06 alaw 0x07 ulaw 0x0200 4 bits to 16 bits Creative ADPCM (only valid in block type 0x09)
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