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QTVR Track

A QTVR track is a special type of QuickTime track that maintains a list of all the nodes in a movie. The media type for a QTVR track is 'qtvr'. All the media samples in a QTVR track share a common sample description. This sample description contains the VR world atom container. The track contains one media sample for each node in the movie. Each QuickTime VR media sample contains a node information atom container.

QuickTime VR Sample Description Structure

Whereas the QuickTime VR media sample is simply the node information itself, all sample descriptions are required by QuickTime to have a certain structure for the first several bytes. The structure for the QuickTime VR sample description is as follows:

typedef struct QTVRSampleDescription {

    UInt32                              size;

    UInt32                              type;

    UInt32                              reserved1;

    UInt16                              reserved2;

    UInt16                              dataRefIndex;

    UInt32                              data;

} QTVRSampleDescription, *QTVRSampleDescriptionPtr, **QTVRSampleDescriptionHandle;

Field descriptions

size

The size, in bytes, of the sample description header structure, including the VR world atom container contained in the data field.

type

The sample description type. For QuickTime VR movies, this type should be 'qtvr'.

reserved1

Reserved. This field must be 0.

reserved2

Reserved. This field must be 0.

dataRefIndex

Reserved. This field must be 0.

data

The VR world atom container. The sample description structure is extended to hold this atom container.

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