Поделиться через

IVMRMixerControl9::GetProcAmpControlRange

  • Статья
 
Microsoft DirectShow 9.0

IVMRMixerControl9::GetProcAmpControlRange

The GetProcAmpControlRange method retrieves the range of values for an image adjustment setting, such as brightness, contrast, hue, or saturation. Image adjustment is performed by the graphics device, so the valid range depends on the graphics driver. If the driver does not support hardware image adjustment, this method fails.

Syntax

  HRESULT GetProcAmpControlRange(
  DWORD  dwStreamID,
  VMR9ProcAmpControlRange*  lpClrControl
);

Parameters

dwStreamID

[in]  Specifies the input stream. This value corresponds to the input pin. For example, the first input pin is stream 0.

pRect

[in, out]  Pointer to a VMR9ProcAmpControlRange structure that receives the range. The caller must set the dwSize and dwProperty fields.

Return Values

The method returns an HRESULT. Possible values include those in the following table.

Value Description
E_INVALIDARG Invalid argument. Possible causes of this error include:
  • The stream number is invalid
  • The value of dwSize or dwProperty in the VMR9ProcAmpControl structure is invalid.
E_POINTER NULL pointer argument.
S_OK Success.
VFW_E_NOT_CONNECTED The pin is not connected.
VFW_E_VMR_NO_PROCAMP_HW The graphics hardware does not support ProcAmp controls.

Requirements

Header: Include D3d9.h, Vmr9.h.

Library: Use Strmiids.lib.

See Also