IOCTL_BTHHFP_MIC_SET_VOLUME IOCTL (bthhfpddi.h)
The IOCTL_BTHHFP_MIC_SET_VOLUME IOCTL sets the volume level of the microphone for the Bluetooth device.
Major code
Input buffer
A LONG that represents the volume level in 1/65536 decibels.
Input buffer length
The size of a LONG.
Output buffer
N/A
Output buffer length
N/A
Status block
N/A
Remarks
The audio driver sends this request when handling the KSPROPERTY_AUDIO_VOLUMELEVEL property for the KSNODETYPE_VOLUME node in the KS topology of the microphone path. The request’s input parameter is the same as the KSPROPERTY_AUDIO_VOLUMELEVEL property value.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 8 |
| Minimum supported server | Windows Server 2012 |
| Header | bthhfpddi.h |