MFGetAttributeRatio function (mfapi.h)
Retrieves an attribute whose value is a ratio.
Syntax
HRESULT MFGetAttributeRatio(
[in] IMFAttributes *pAttributes,
[in] REFGUID guidKey,
[out] UINT32 *punNumerator,
[out] UINT32 *punDenominator
);
Parameters
[in] pAttributes
Pointer to the IMFAttributes interface of the attribute store.
[in] guidKey
GUID that identifies which value to retrieve. The attribute type must be MF_ATTRIBUTE_UINT64.
[out] punNumerator
Receives the numerator of the ratio.
[out] punDenominator
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
| 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 |