MFSetAttributeRatio function (mfapi.h)
Sets a ratio as a 64-bit attribute value.
Syntax
HRESULT MFSetAttributeRatio(
[in] IMFAttributes *pAttributes,
[in] REFGUID guidKey,
[in] UINT32 unNumerator,
[in] UINT32 unDenominator
);
Parameters
[in] pAttributes
A pointer to the IMFAttributes interface of the attribute store.
[in] guidKey
A GUID that identifies the value to set. If this key already exists, the function overwrites the old value.
[in] unNumerator
The numerator of the ratio.
[in] unDenominator
The denominator of the ratio.
Return value
If this function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.
Remarks
Some attributes specify a ratio as a packed UINT64 value. This function packs the numerator and denominator into a single UINT64 value.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista [desktop apps | UWP apps] |
| Minimum supported server | Windows Server 2008 [desktop apps | UWP apps] |
| Target Platform | Windows |
| Header | mfapi.h |