waveOutSetVolume
The
waveOutSetVolume function sets the volume level of the specified waveform-audio output device.
MMRESULT waveOutSetVolume(
HWAVEOUT hwo,
|
|
DWORD dwVolume
|
|
);
|
|
Parameters
hwo
Handle of an open waveform-audio output device. This parameter can also be a
device identifier.
dwVolume
New volume setting. The low-order word contains the left-channel volume
setting, and the high-order word contains 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_INVALHANDLE
| Specified device handle is invalid.
|
MMSYSERR_NODRIVER
| No device driver is present.
|
MMSYSERR_NOMEM
| Unable to allocate or lock memory.
|
MMSYSERR_NOTSUPPORTED
| Function is not supported.
|
Remarks
If a device identifier is used, then the result of the
waveOutSetVolume call applies to all instances of the device. If a device handle is used, then
the result applies only to the instance of the device referenced by the device
handle.
Not all devices support volume changes. To determine whether the device
supports volume control, use the WAVECAPS_VOLUME flag to test the
dwSupport member of the
WAVEOUTCAPS structure (filled by the
waveOutGetDevCaps function). To determine whether the device supports volume control on both
the left and right channels, use the WAVECAPS_LRVOLUME flag.
Most devices do not support the full 16 bits of volume-level control and will
not use 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 all produce the same physical volume setting:
0x4000. The
waveOutGetVolume function returns the full 16-bit setting set with
waveOutSetVolume.
Volume settings are interpreted logarithmically. This means the perceived
increase in volume is the same when increasing the volume level from 0x5000 to
0x6000 as it is from 0x4000 to 0x5000.
See Also
WAVEOUTCAPS,
waveOutGetDevCaps,
waveOutGetVolume
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