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

Media Data Atom TypesStreaming MediaThe data format field in the sample description is always set to 'qd3d'. The 3D media handler adds no additionalfields to the sample description.3D Sample DataThe 3D samples are stored in the 3D Metafile format developed for QuickDraw 3D.Streaming MediaQuickTime movies store streaming data in a streaming media track. This media has a media type of 'strm'.Streaming Media Sample DescriptionThe streaming media sample description contains information that defines how to interpret streaming mediadata. This sample description is based on the standard sample description header, as described in “SampleTable Atoms” (page 96).The streaming media sample description is documented in the QuickTime header file QTSMovie.h, as shownin Listing 4-1 (page 250).Listing 4-1Streaming media sample descriptionstruct QTSSampleDescription {longlongdescSize;dataFormat;long resvd1; /* set to 0*/short resvd2; /* set to 0*/shortUInt32dataRefIndex;version;UInt32 resvd3; /* set to 0*/SInt32flags;/* qt atoms follow:*//* long size, long type, some data*//* repeat as necessary*/};typedef struct QTSSampleDescriptionQTSSampleDescription;2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.250