MF_MT_AUDIO_CHANNEL_MASK attribute

In an audio media type, specifies the assignment of audio channels to speaker positions.

Data type

UINT32

The value of this attribute is a bitwise OR of the following flags, which are defined in the header file mmreg.h.

SPEAKER_FRONT_LEFT (0x1)
SPEAKER_FRONT_RIGHT (0x2)
SPEAKER_FRONT_CENTER (0x4)
SPEAKER_LOW_FREQUENCY (0x8)
SPEAKER_BACK_LEFT (0x10)
SPEAKER_BACK_RIGHT (0x20)
SPEAKER_FRONT_LEFT_OF_CENTER (0x40)
SPEAKER_FRONT_RIGHT_OF_CENTER (0x80)
SPEAKER_BACK_CENTER (0x100)
SPEAKER_SIDE_LEFT (0x200)
SPEAKER_SIDE_RIGHT (0x400)
SPEAKER_TOP_CENTER (0x800)
SPEAKER_TOP_FRONT_LEFT (0x1000)
SPEAKER_TOP_FRONT_CENTER (0x2000)
SPEAKER_TOP_FRONT_RIGHT (0x4000)
SPEAKER_TOP_BACK_LEFT (0x8000)
SPEAKER_TOP_BACK_CENTER (0x10000)
SPEAKER_TOP_BACK_RIGHT (0x20000)

This attribute corresponds to the dwChannelMask member of the WAVEFORMATEXTENSIBLE structure.

The GUID constant for this attribute is exported from mfuuid.lib.

Requirement	Value
Minimum supported client	Windows Vista [desktop apps \| UWP apps]
Minimum supported server	Windows Server 2008 [desktop apps \| UWP apps]
Header	Mfapi.h