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Have a look at the insides of the Racer file formats.

The RTD file format is used for storing telemetry data (since v0.8.18). Notice that the format may change in the oncoming months; after that it probably stabilizes quite a bit since telemetry storage is not really rocket science.

Header

The file header is as follows:

• RTD0 - a 4-byte identifier
• int signals - the number of signals in the file
• float dx - the timestep (expect 0.01 for example)

Properties

After the header a number of generic properties are written:

• PROP - a 4-byte identifier (char[4])
• int properties - the number of properties in the file
• for each property, a string 'key' and a 'string value'. A string is written as 'short len; char data[len];' - without the trailing zero.

Properties are used to pass things like 'car' and 'track' in a flexible way. More properties may be stored in the future.

Signal data

Next is the the signal data.

• SGNL - a 4-byte identifier that indicates a signal is coming up (some telemetry programs call this a 'channel').
• int signalType - an enum that indicates what type of signal. This is used to avoid hardcoding names. Currently the following types are defined:
• .....

(to be enhanced)

(last updated June 5, 2011 )