IVMRDeinterlaceControl::GetNumberOfDeinterlaceModes method (strmif.h)
[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]
The GetNumberOfDeinterlaceModes method retrieves the deinterlacing modes available to the VMR for the specified video format.
Syntax
HRESULT GetNumberOfDeinterlaceModes(
[in] VMRVideoDesc *lpVideoDescription,
[in, out] LPDWORD lpdwNumDeinterlaceModes,
[out] LPGUID lpDeinterlaceModes
);
Parameters
[in] lpVideoDescription
Pointer to a VMRVideoDesc structure that describes the video.
[in, out] lpdwNumDeinterlaceModes
Pointer to a DWORD value. On input, this value specifies the size of the array given in lpDeinterlaceModes. On output, it receives number of GUIDs the method copied into the array.
[out] lpDeinterlaceModes
Address of an array allocated by caller. The method fills the array with GUID values. To determine the size of the array that is needed, set this parameter to NULL and check the value returned in lpdwNumDeinterlaceModes.
Return value
Returns an HRESULT value. Possible values include the following:
| Return code | Description |
|---|---|
|
NULL pointer argument. |
|
Success |
|
The VMR is not in mixer mode. |
|
The video card does not support hardware deinterlacing. |
Remarks
This method returns an array of GUIDs, where each GUID represents a deinterlacing mode that is supported in hardware by the graphics device driver. The array is sorted by quality, so the first entry represents the best quality, the second entry represents the next best quality, and so forth.
All drivers are required to support the following mode:
| GUID | Description |
|---|---|
| DXVA_DeinterlaceBobDevice | Bob mode |
Drivers can support additional modes and should define their own GUIDs to identify them. For each returned mode, call the IVMRDeinterlaceControl::GetDeinterlaceModeCaps method to get information about that mode.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP with SP1 [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | strmif.h (include Dshow.h) |
| Library | Strmiids.lib |