diff --git a/reactos/drivers/ksfilter/ks/api.c b/reactos/drivers/ksfilter/ks/api.c
index 8f2874a2257..0e50f313f70 100644
--- a/reactos/drivers/ksfilter/ks/api.c
+++ b/reactos/drivers/ksfilter/ks/api.c
@@ -1220,7 +1220,7 @@ KsAcquireControl(
 }
 
 /*
-    @unimplemented
+    @implemented
 */
 KSDDKAPI
 VOID
@@ -1228,9 +1228,65 @@ NTAPI
 KsAcquireDevice(
     IN PKSDEVICE Device)
 {
-    UNIMPLEMENTED
+    IKsDevice *KsDevice;
+    PKSIDEVICE_HEADER DeviceHeader = (PKSIDEVICE_HEADER)CONTAINING_RECORD(Device, KSIDEVICE_HEADER, KsDevice);
+
+    /* get device interface*/
+    KsDevice = (IKsDevice*)&DeviceHeader->lpVtblIKsDevice;
+
+    /* acquire device mutex */
+    KsDevice->lpVtbl->AcquireDevice(KsDevice);
 }
 
+/*
+    @implemented
+*/
+VOID
+NTAPI
+KsReleaseDevice(
+    IN PKSDEVICE  Device)
+{
+    IKsDevice *KsDevice;
+    PKSIDEVICE_HEADER DeviceHeader = (PKSIDEVICE_HEADER)CONTAINING_RECORD(Device, KSIDEVICE_HEADER, KsDevice);
+
+    /* get device interface*/
+    KsDevice = (IKsDevice*)&DeviceHeader->lpVtblIKsDevice;
+
+    /* release device mutex */
+    KsDevice->lpVtbl->ReleaseDevice(KsDevice);
+}
+
+/*
+    @implemented
+*/
+KSDDKAPI
+VOID
+NTAPI
+KsTerminateDevice(
+    IN PDEVICE_OBJECT DeviceObject)
+{
+    IKsDevice *KsDevice;
+    PKSIDEVICE_HEADER DeviceHeader;
+    PDEVICE_EXTENSION DeviceExtension = (PDEVICE_EXTENSION)DeviceObject->DeviceExtension;
+
+    /* get device header */
+    DeviceHeader = DeviceExtension->DeviceHeader;
+
+    /* get device interface*/
+    KsDevice = (IKsDevice*)&DeviceHeader->lpVtblIKsDevice;
+
+    /* now free device header */
+    KsFreeDeviceHeader((KSDEVICE_HEADER)DeviceHeader);
+
+    /* release interface when available */
+    if (KsDevice)
+    {
+        /* delete IKsDevice interface */
+        KsDevice->lpVtbl->Release(KsDevice);
+    }
+}
+
+
 
 /*
     @unimplemented
diff --git a/reactos/drivers/ksfilter/ks/device.c b/reactos/drivers/ksfilter/ks/device.c
index 3bfd6191439..f6f5d33c66e 100644
--- a/reactos/drivers/ksfilter/ks/device.c
+++ b/reactos/drivers/ksfilter/ks/device.c
@@ -681,32 +681,7 @@ KsInitializeDevice(
 }
 
 /*
-    @implemented
-*/
-KSDDKAPI
-VOID
-NTAPI
-KsTerminateDevice(
-    IN PDEVICE_OBJECT DeviceObject)
-{
-    UNIMPLEMENTED
-}
-
-/*
-    @implemented
-*/
-VOID
-NTAPI
-KsReleaseDevice(
-    IN PKSDEVICE  Device)
-{
-    UNIMPLEMENTED
-}
-
-
-
-/*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 NTSTATUS
diff --git a/reactos/drivers/ksfilter/ks/filter.c b/reactos/drivers/ksfilter/ks/filter.c
index b8437cf8415..2cb42a737f0 100644
--- a/reactos/drivers/ksfilter/ks/filter.c
+++ b/reactos/drivers/ksfilter/ks/filter.c
@@ -926,7 +926,7 @@ KspCreateFilter(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 VOID
@@ -938,7 +938,7 @@ KsFilterAcquireProcessingMutex(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 VOID
@@ -950,7 +950,7 @@ KsFilterReleaseProcessingMutex(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 NTSTATUS
@@ -965,7 +965,7 @@ KsFilterAddTopologyConnections (
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 VOID
@@ -978,7 +978,7 @@ KsFilterAttemptProcessing(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 NTSTATUS
@@ -993,7 +993,7 @@ KsFilterCreateNode (
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 NTSTATUS
@@ -1008,7 +1008,7 @@ KsFilterCreatePinFactory (
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 PKSGATE
@@ -1021,7 +1021,7 @@ KsFilterGetAndGate(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 ULONG
@@ -1035,7 +1035,7 @@ KsFilterGetChildPinCount(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 PKSPIN
@@ -1049,7 +1049,7 @@ KsFilterGetFirstChildPin(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 VOID
@@ -1063,7 +1063,7 @@ KsFilterRegisterPowerCallbacks(
 }
 
 /*
-    @implemented
+    @unimplemented
 */
 KSDDKAPI
 PKSFILTER
diff --git a/reactos/drivers/ksfilter/ks/ks.spec b/reactos/drivers/ksfilter/ks/ks.spec
index a3234b13c0f..c1de7281046 100644
--- a/reactos/drivers/ksfilter/ks/ks.spec
+++ b/reactos/drivers/ksfilter/ks/ks.spec
@@ -153,7 +153,7 @@
 @ stdcall KsPinRegisterIrpCompletionCallback(ptr ptr)
 @ stdcall KsPinRegisterPowerCallbacks(ptr ptr ptr)
 @ stdcall KsPinReleaseProcessingMutex(ptr)
-;@ stdcall KsPinSetPinClockTime(ptr long)
+@ stdcall KsPinSetPinClockTime(ptr double)
 @ stdcall KsPinSubmitFrame(ptr ptr long ptr ptr)
 @ stdcall KsPinSubmitFrameMdl(ptr ptr ptr ptr)
 @ stdcall KsProbeStreamIrp(ptr long long)
@@ -184,7 +184,7 @@
 @ stdcall KsServiceBusEnumCreateRequest(ptr ptr)
 @ stdcall KsServiceBusEnumPnpRequest(ptr ptr)
 @ stdcall KsSetDefaultClockState(ptr long)
-;@ stdcall KsSetDefaultClockTime(ptr long)
+@ stdcall KsSetDefaultClockTime(ptr double)
 @ stdcall KsSetDevicePnpAndBaseObject(ptr ptr ptr)
 @ stdcall KsSetInformationFile(ptr ptr long long)
 @ stdcall KsSetMajorFunctionHandler(ptr long)
@@ -202,7 +202,7 @@
 @ stdcall KsStreamPointerGetMdl(ptr)
 @ stdcall KsStreamPointerGetNextClone(ptr)
 @ stdcall KsStreamPointerLock(ptr)
-;@ stdcall KsStreamPointerScheduleTimeout(ptr ptr longlong)
+@ stdcall KsStreamPointerScheduleTimeout(ptr ptr double)
 @ stdcall KsStreamPointerSetStatusCode(ptr long)
 @ stdcall KsStreamPointerUnlock(ptr long)
 @ stdcall KsSynchronousIoControlDevice(ptr long long ptr long ptr long ptr)