KsCacheMedium - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
// ks.h

KSDDKAPI NTSTATUS KsCacheMedium(
  [in] PUNICODE_STRING SymbolicLink,
  [in] PKSPIN_MEDIUM   Medium,
  [in] ULONG           PinDirection
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-ks-kscachemedium)

KsCacheMedium function

Description

The KsCacheMedium function improves graph building performance of pins that use Mediums to define connectivity.

Parameters

The symbolic link used to open the device interface.

Medium [in]

Points to the medium to cache.

PinDirection [in]

Contains the direction of the Pin. 1 is output, 0 is input.

Return value

KsCacheMedium returns STATUS_SUCCESS if the caching operation is successful, failure if it is not.

Remarks

KsCacheMedium improves graph building performance by creating a registry key at:

\System\CurrentControlSet\Control\MediumCache\GUID\DWORD\DWORD

This enables fast lookup of connected filters in TvTuner and other complex graphs. Note that the GUID identifies the Medium of the connection, and that the DWORDs denote the device instance. The value name is the SymbolicLink for the driver, and ActualValue is the pin direction.turning.

View the official Windows Driver Kit DDI reference

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