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

Movie AtomsTrack AtomsFigure 2-13 (page 67) shows the layout of this atom.Figure 2-13The layout of a clipping atomBytesClipping atomAtom sizeType = 'clip'44Clipping region atomAtom sizeType = 'crgn'Region sizeRegion boundary boxClipping region data4428VariableClipping atoms contain the following data elements.SizeA 32-bit integer that specifies the number of bytes in this clipping atom.TypeA 32-bit integer that identifies the atom type; this field must be set to 'clip'.Clipping region atomSee “Clipping Region Atoms” (page 67).Clipping Region AtomsThe clipping region atom contains the data that specifies the clipping region, including its size, bounding box,and region. Clipping region atoms have an atom type value of 'crgn'.The layout of the clipping region atom is shown in Figure 2-13 (page 67).Clipping region atoms contain the following data elements.SizeA 32-bit integer that specifies the number of bytes in this clipping region atom.TypeA 32-bit integer that identifies the atom type; this field must be set to 'crgn'.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.67