Inside Macintosh: QuickTime Components

Required Functions

At a minimum, your channel component should support the following functions:

SGGetChannelInfo	SGRelease
SGGetChannelUsage	SGSetChannelRefCon
SGGetDataRate	SGSetChannelUsage
SGIdle	SGStartPreview
SGInitChannel	SGStartRecord
SGPause	SGStop
SGPrepare	SGWriteSamples

In addition, if your channel component supports visual data, it should support at least the following functions:



 
SGGetChannelBounds

SGSetChannelBounds

SGSetGWorld

If your channel component supports audio data, it should support the following functions as well:



 
SGGetChannelVolume

SGSetChannelVolume

The remaining functions described in this section are optional. However, your channel component should support as many of these functions as possible, so that your component is more useful to applications and users.

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