|
auxSetVolume
The auxSetVolume function sets the volume of the specified auxiliary output device.
MMRESULT auxSetVolume(
UINT uDeviceID,
|
| DWORD dwVolume
|
| );
|
|
Parameters
uDeviceID
Identifier of the auxiliary output device to be queried. Device identifiers
are determined implicitly from the number of devices present in the system.
Device identifier values range from zero to one less than the number of devices
present. Use the auxGetNumDevs function to determine the number of auxiliary devices in the system.
dwVolume
Specifies the new volume setting. The low-order word specifies the
left-channel volume setting, and the high-order word specifies the right-channel setting.
A value of 0xFFFF represents full volume, and a value of 0x0000 is silence.
If a device does not support both left and right volume control, the low-order
word of dwVolume specifies the volume level, and the high-order word is ignored.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MMSYSERR_BADDEVICEID
| Specified device identifier is out of range.
|
Remarks
Not all devices support volume control. To determine whether the device
supports volume control, use the AUXCAPS_VOLUME flag to test the dwSupport member of the AUXCAPS structure (filled by the auxGetDevCaps function).
To determine whether the device supports volume control on both the left and
right channels, use the AUXCAPS_LRVOLUME flag to test the dwSupport member of the AUXCAPS structure (filled by auxGetDevCaps).
Most devices do not support the full 16 bits of volume-level control and will
use only the high-order bits of the requested volume setting. For example, for
a device that supports 4 bits of volume control, requested volume level values
of 0x4000, 0x4FFF, and 0x43BE will produce the same physical volume setting,
0x4000. The auxGetVolume function will return the full 16-bit setting set with auxSetVolume.
Volume settings are interpreted logarithmically. This means the perceived
volume increase is the same when increasing the volume level from 0x5000 to 0x6000
as it is from 0x4000 to 0x5000.
See Also
AUXCAPS, auxGetDevCaps, auxGetVolume
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