Inside Macintosh: Sound /

Chapter 3 - Sound Input Manager / Sound Input Manager Reference

Sound Input Manager Routines / Manipulating Device Settings

SPBSetDeviceInfo

You can use the SPBSetDeviceInfo function to set information in a sound input device.

FUNCTION SPBSetDeviceInfo (inRefNum: LongInt; infoType: OSType; 
                            infoData: Ptr): OSErr;

inRefNum

The device reference number of the sound input device, as obtained from the SPBOpenDevice function.

infoType

A sound input device information selector that specifies the type of information you need.

infoData

A pointer to a buffer. This buffer can contain information on entry, and information might be returned on exit. This buffer must be large enough for the type of information specified in the infoType parameter, and the data in the buffer must be set to appropriate values if information needs to be passed in to the SPBSetDeviceInfo function.

DESCRIPTION

The SPBSetDeviceInfo function sets information about the sound input device specified by the inRefNum parameter, based on the data in the buffer specified by the infoData parameter.

The type of setting you wish to change is specified in the infoType parameter. The sound input device information selectors are listed in "Sound Input Device Information Selectors" beginning on page 3-18.

SPECIAL CONSIDERATIONS

Because the SPBSetDeviceInfo function might move memory, you should not call it at interrupt time. Check the selector description of the selector you want to use to see if it moves memory before calling the SPBGetDeviceInfo function. Most of the selectors do not move memory and are therefore safe to use at interrupt time.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for the SPBSetDeviceInfo function are

Trap macro	Selector
_SoundDispatch	$063C0014

RESULT CODES

noErr	0	No error
permErr	-54	Attempt to open locked file for writing
siBadSoundInDevice	-221	Invalid sound input device
siDeviceBusyErr	-227	Sound input device is busy
siUnknownInfoType	-231	Unknown type of information