The Frame Information Structure(IM: QC)

Inside Macintosh: QuickTime Components /

Chapter 5 - Sequence Grabber Components / Sequence Grabber Components Reference

The Frame Information Structure
The frame information structure defines a frame for a sequence grabber component and sequence grabber channel components. The SeqGrabFrameInfo data type defines the format of a frame information structure.
struct SeqGrabFrameInfo {
   long        frameOffset;   /* offset to the sample */
   long        frameTime;     /* time that frame was captured */
   long        frameSize;     /* number of bytes in sample */
   SGChannel   frameChannel;  /* current connection to channel */
   long        frameRefCon;   /* reference constant for channel */
};
Field Description

frameOffset
Specifies the offset to the sample.
frameTime
Specifies the time at which a sequence grabber channel component captured the frame. This time value is relative to the data sequence. That is, this time is not represented in the context of any fixed time scale. Rather, the channel component must choose and use a
time scale consistently for all sample references.
frameSize
Specifies the number of bytes in the sample described by the sample reference.
frameChannel
Identifies the current connection to the channel component.
frameRefCon
Contains a reference constant for use by the channel component. A channel component can use this value in any way that is appropriate. For example, video channel components may use this value to store a reference to frame differencing information for a temporally compressed image sequence.