QuickTime 3 Reference

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Knob Description Record

A knob description record contains sound parameter values for a single knob. It is defined by the KnobDescription data type.

struct KnobDescription {
    Str63                       name;
    long                        lowValue;
    long                        highValue;
    long                        defaultValue;
    long                        flags;
    long                        knobID;
};
typedef struct KnobDescription KnobDescription;
name
The name of the knob.
lowValue
The lowest number you can set the knob to.
highValue
The highest number you can set the knob to.
defaultValue
A value to use for the default.
flags
Various information about the knob. Knob Flags
knobID
A knob ID or index. A nonzero value in the high byte indicates that it is an ID. The knob index ranges from 1 to the number of knobs; the ID is an arbitrary number. Use the knob ID to refer to the knob in preference over the knob index, which may change.
© 1997 Apple Computer, Inc.

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