Inside Macintosh: Sound Manager

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Sound Input Device Drivers

The Sound Input Manager also provides several routines intended for use only by sound input device drivers. Sound input device drivers need to register themselves with the Sound Input Manager by calling the SPBSignInDevice function. This makes that device visible in the Sound In control panel for possible selection as the current input device. You can remove a device from that panel by calling the SPBSignOutDevice function.

For Macintosh computers with built-in sound recording hardware, the system software includes a sound input device driver. This driver automatically calls SPBSignInDevice when the computer starts up. If you are creating a sound input device driver for some other sound recording hardware, your device driver must register itself at startup time. Once your driver is registered, it must respond to Status, Control, and Read calls issued by the Sound Input Manager. The Sound Input Manager issues Status calls to get information about a device, Control calls to set device settings, and Read calls to initiate recording.

Inside Macintosh: Sound Manager

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