|Microsoft DirectX 9.0|
The GetFreeCount method returns the number of free media samples. This number equals the total number of media samples minus the number of samples that are currently held by filters.
HRESULT GetFreeCount( LONG *plBuffersFree );
[out] Pointer to a variable that receives the number of free media samples.
Returns an HRESULT value. Possible values include the following.
|E_POINTER||NULL pointer argument|
A filter holds a sample by keeping a reference count on it. It releases the sample by releasing the reference count.
Until the allocator is committed, the samples are not guaranteed to be allocated.