Ginsu Wave Content

Ginsu is the primary audio format used for continuous engine/exhaust sounds.

Decoding

Ginsu resources can be decoded using a tool such as Ginsu Converter.

Structures

Note: Ginsus begin with a Binary File resource.

rw::audio::core::GinsuDataLayout

The header for the audio data.

Offset	Length	Type	Name	Description	Comments
0x0	0x4	char[4]	id	Magic	Gnsu
0x4	0x2	char[2]	ver	Version number	20
0x6	0x2	short	flags		Always null
0x8	0x4	float	minFrequency	Minimum RPM
0xc	0x4	float	maxFrequency	Maximum RPM
0x10	0x4	int	segCount	Number of segments	Always 50
0x14	0x4	int	cycleCount	Number of cycles
0x18	0x4	int	sampleCount	Total number of samples
0x1c	0x4	int	sampleRate	Sample rate (Hz)
0x20	0x1	uchar[1]	data	Ginsu data	See data
0x21	0x3			Padding

Data

The header is followed by two tables of 32-bit integers representing sample indices.

The first table defines the segments, likely so only a particular portion of the audio is loaded at a given time. This always has 51 entries (though the count value is always 50) with an additional 4 bytes of padding following it.

The second table defines the cycles. Each cycle is a specific point in the rev range; at any time, it may be played continuously, switched to the next or previous cycle, or stopped altogether. A 10-second Ginsu normally contains around 400 cycles. Cycles can be automatically generated by a tool such as Crankcase Audio REV.

Audio data immediately follows the tables. It uses a proprietary lossy codec most closely related to 4-bit ADPCM.