MFGetAttributeRatio function
Retrieves an attribute whose value is a ratio.
Syntax
HRESULT MFGetAttributeRatio( _In_ IMFAttributes *pAttributes, _In_ REFGUID guidKey, _Out_ UINT32 *pnNumerator, _Out_ UINT32 *punDenominator );
Parameters
- pAttributes [in]
-
Pointer to the IMFAttributes interface of the attribute store.
- guidKey [in]
-
GUID that identifies which value to retrieve. The attribute type must be MF_ATTRIBUTE_UINT64.
- pnNumerator [out]
-
Receives the numerator of the ratio.
- punDenominator [out]
-
Receives 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. Use this function to get the numerator and denominator as separate 32-bit values.
Requirements
|
Minimum supported client |
Windows Vista [desktop apps | Windows Store apps] |
|---|---|
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Minimum supported server |
Windows Server 2008 [desktop apps | Windows Store apps] |
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Header |
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See also
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