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IAudioEndpointVolume::QueryHardwareSupport

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IAudioEndpointVolume::QueryHardwareSupport

The QueryHardwareSupport method queries the audio endpoint device for its hardware-supported functions.

HRESULT QueryHardwareSupport(
  DWORD  *pdwHardwareSupportMask
);

Parameters

pdwHardwareSupportMask

[out] Pointer to a DWORD variable into which the method writes a hardware support mask that indicates the hardware capabilities of the audio endpoint device. The method can set the mask to 0 or to the bitwise-OR combination of one or more ENDPOINT_HARDWARE_SUPPORT_XXX constants.

Return Value

If the method succeeds, it returns S_OK. If it fails, possible return codes include, but are not limited to, the values shown in the following table.

Return code Description
E_POINTER Parameter pdwHardwareSupportMask is NULL.

Remarks

This method indicates whether the audio endpoint device implements the following functions in hardware:

  • Volume control
  • Mute control
  • Peak meter

The system automatically substitutes a software implementation for any function in the preceding list that the endpoint device does not implement in hardware.

Requirements

Client: Windows Vista

Header: Include Endpointvolume.h.

See Also

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