// ksmedia.h

typedef struct {
  ULONG ulDeviceType;
} KSWAVE_COMPATCAPS, *PKSWAVE_COMPATCAPS;
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (ns-ksmedia-kswave_compatcaps)

The KSWAVE_COMPATCAPS structure is used to describe the compatible capabilities of a device.

Specifies the following flags:

Flag	Meaning
KSWAVE_COMPATCAPS_INPUT	Indicates that the device accepts input.
KSWAVE_COMPATCAPS_OUTPUT	Indicates that the device produces output.

This structure is used by the KSPROPERTY_WAVE_COMPATIBLE_CAPABILITIES property.