IVMRMixerControl9::SetAlpha

Microsoft DirectShow 9.0

IVMRMixerControl9::SetAlpha

The SetAlpha method sets a constant alpha value that is applied to this video stream.

Syntax

  HRESULT SetAlpha(
  DWORD  dwStreamID,
  float  Alpha
);

Parameters

dwStreamID

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

Alpha

[in]   Specifies the alpha blending value to be applied to all the pixels in this stream.

Return Values

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

Value	Description
S_OK	The method succeeded.
VFW_E_NOT_CONNECTED	The pin is not connected.

Remarks

The alpha value specified can range from 0.0 (fully transparent) to 1.0 (full opaque).

Requirements

Header: Include D3d9.h, Vmr9.h.

Library: Use Strmiids.lib.

See Also

• IVMRMixerControl9 Interface