// bthhfpddi.h

// CTL_CODE(0x0022, 0x006, METHOD_NEITHER, FILE_ANY_ACCESS)
#define IOCTL_BTHHFP_SPEAKER_SET_VOLUME 0x0022001B
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Windows Driver Kit DDI reference (ni-bthhfpddi-ioctl_bthhfp_speaker_set_volume)

IOCTL_BTHHFP_SPEAKER_SET_VOLUME IOCTL

Description

The IOCTL_BTHHFP_SPEAKER_SET_VOLUME IOCTL sets the volume level for the speaker of the Bluetooth device.

Parameters

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

Input/output buffer

Input/output buffer length

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 speaker path. The request’s input parameter is the same as the KSPROPERTY_AUDIO_VOLUMELEVEL property value.

IOCTL_BTHHFP_SPEAKER_SET_VOLUME - NtDoc