Inside Macintosh: QuickTime Components /

Chapter 6 - Sequence Grabber Channel Components / Sequence Grabber Channel Components Reference

Functions / Configuration Functions for All Channel Components

SGGetChannelInfo

The SGGetChannelInfo function allows the sequence grabber to determine how a channel's data is represented to the user--as visual or audio data, or both.

pascal ComponentResult SGGetChannelInfo (SGChannel c,
                                          long *channelInfo);

c

Identifies the channel connection for this operation.

channelInfo

Contains a pointer to a long integer that is to receive channel information flags. You may set more than one flag to 1. Set unused flags to 0. The following flags are defined:

seqGrabHasBounds

Indicates that your channel has a visual representation. If you set this flag to 1, the channel has a visual representation. The sequence grabber component may call your SGSetChannelBounds function (described on page 6-60).

seqGrabHasVolume

Indicates that your channel has an audio representation. If you set this flag to 1, the channel has an audio representation. The sequence grabber component may call your SGSetChannelVolume function (described on page 6-75).

seqGrabHasDiscreteSamples

Indicates that the data captured by your channel component is organized into discrete frames. If you set this flag to 1, the sequence grabber component may use the SGSetChannelMaxFrames function (described on page 6-50) to limit the number of frames processed in a record operation or the rate at which those frames are processed. If your channel's data is not organized into frames, set this flag to 0.

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