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siActive Channels Unsupported on Some Power Macs

Q When I call SPBGetDeviceInfo or SPBSetDeviceInfo with the siActiveChannels selector on a 5200/5300/6200/6300 Power Macintosh, it returns siUnknownInfoType. What's wrong?

A The Power Macintosh 5200/5300/6200/6300 sound input drivers do not support the siActiveChannels selector. You will have to record in stereo and throw out the channel that you did not want. The best place to do this is in the interrupt routine: copy out the data only from the channel that you actually want to record from.

In general, if a selector is not supported, SPBGetDeviceInfo and SPBSetDeviceInfo will return siUnknownInfoType. You will have to determine for yourself if this is a significant error as far as your project is concerned.

[Jun 01 1996]

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