AUXDM_SETVOLUME
Sent to an auxiliary audio device driver to set the volume level for an auxiliary audio device.
- The return value is an error code, or zero (MMSYSERR_NOERROR) if the operation is successful. Possible error codes are:
| MMSYSERR_NOTENABLED |
The driver failed to load or initialize. |
| MMSYSERR_NOTSUPPORTED |
The driver does not support changes to volume level. |
- DWORD dwParam1
- Specifies the new volume level. The high-order word contains the right channel setting and the low-order word contains the left channel setting. A value of 0 is silence, and a value of 0xFFFF is full volume. If the driver does not support both left and right channel volume changes, it uses the volume specified in the low-order word. The driver will probably not support the full 16 bits of volume control and should truncate the lower bits if necessary. However, the original value requested with AUXDM_SETVOLUME should be returned with AUXDM_GETVOLUME.
- DWORD dwParam2
- Unused.
Support for volume level changes is optional. Drivers must indicate whether they support volume level changes when they receive the AUXDM_GETDEVCAPS message.
If a driver supports changes to the volume level with the AUXDM_SETVOLUME message, it must support queries with the AUXDM_GETVOLUME message.