Quicktime File Format (2012-08-14).pdf

Overview of QTFFQT Atoms and Atom ContainersEach container atom starts with a QT atom header followed by the atom’s contents. The contents are eitherchild atoms or data, but never both. If an atom contains children, it also contains all of its children’s data anddescendants. The root atom is always present and never has any siblings.Figure 1-3QT atom layoutQT atom container headerReservedLock countQT atom headerSizeTypeAtom IDReservedChild countReservedChild atomSizeTypeChild atomSizeTypeA QT atom container header contains the following data:ReservedA 10-byte element that must be set to 0.Lock countA 16-bit integer that must be set to 0.Each QT atom header contains the following data:2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.26