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QT Atom Container Description Key

Because QT atom container–based data structures are widely used in QuickTime, a description key is presented here. Its usage is illustrated in the following sections, “Sprite Media Handler Track Properties QT Atom Container Format” and “Sprite Media Handler Sample QT Atom Container Formats.”

[(QTAtomFormatName)] =

    atomType_1, id, index

        data

    atomType_n, id, index

        data

The atoms may be required or optional:

 // optional atom

 // required atom

<atomType>

atomType

The atom ID may be a number if it is required to be a constant, or it may be a list of valid atom IDs, indicating that multiple atoms of this type are allowed.

3               // one atom with id of 3

(1..3)          // three atoms with id's of 1, 2, and 3

(1, 5, 7)       // three atoms with id's of 1, 5, and 7

(anyUniqueIDs)  // multiple atoms each with a unique id

The atom index may be a 1 if only one atom of this type is allowed, or it may be a range from 1 to some constant or variable.

1               // one atom of this type is allowed, index is always  1

(1..3)          // three atoms with indexes 1, 2, and 3

(1..numAtoms)   // numAtoms atoms with indexes of 1 to numAtoms

The data may be leaf data in which its data type is listed inside of brackets [], or it may be a nested tree of atoms.

[theDataType]   // leaf data of type theDataType

childAtoms      // a nested tree of atoms

Nested QTAtom format definitions [(AtomFormatName)] may appear in a definition.

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