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January 31, 2012 AT 2:34 pm

ScratchML Data Spec

Fader-Data

ScratchML Data Spec @ F.A.T..

ScratchML, like GML, is an XML-based format for storing information about the position of the record and crossfader during a scratch performance.

This is a “beta” release of the .SML file format, with sample data for 1 turntable and 1 crossfader. The format is designed to accomodate multiple turntables and crossfaders and a wide variety of data capture techniques, but we’ve only field-tested it against the basic 1 deck + 1 mixer scratch setup, which is what we were working with this weekend.

The two most important fields are:

  • <turntable> — stores data about the playback position on the record as a consistently sampled stream of floats, with <samplerate> samples per second.
  • <fader> — stores data for crossfader movements, ranging from 0 (full-left) to 1 (full-right). This data is stored only when the fader actually moves, and is stored as <p> (position) and <t> (time) tuplets in the field.

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