|Microsoft DirectX 9.0|
The GetFreeCount method retrieves the number of media samples that are not in use.
HRESULT GetFreeCount( LONG *plBuffersFree );
Address of a variable that receives the number of samples that are not in use.
This method implements the IMemAllocatorCallbackTemp::GetFreeCount method. The allocator does not expose the IMemAllocatorCallbackTemp interface unless the fEnableReleaseCallback flag is set to TRUE in the CBaseAllocator constructor.