diff --git a/dlls/mfplat/main.c b/dlls/mfplat/main.c
index 2d7e02e4730..4ce97b1ffd2 100644
--- a/dlls/mfplat/main.c
+++ b/dlls/mfplat/main.c
@@ -39,6 +39,23 @@ WINE_DEFAULT_DEBUG_CHANNEL(mfplat);
 
 static LONG platform_lock;
 
+struct system_time_source
+{
+    IMFPresentationTimeSource IMFPresentationTimeSource_iface;
+    IMFClockStateSink IMFClockStateSink_iface;
+    LONG refcount;
+};
+
+static struct system_time_source *impl_from_IMFPresentationTimeSource(IMFPresentationTimeSource *iface)
+{
+    return CONTAINING_RECORD(iface, struct system_time_source, IMFPresentationTimeSource_iface);
+}
+
+static struct system_time_source *impl_from_IMFClockStateSink(IMFClockStateSink *iface)
+{
+    return CONTAINING_RECORD(iface, struct system_time_source, IMFClockStateSink_iface);
+}
+
 static const WCHAR transform_keyW[] = {'M','e','d','i','a','F','o','u','n','d','a','t','i','o','n','\\',
                                  'T','r','a','n','s','f','o','r','m','s',0};
 static const WCHAR categories_keyW[] = {'M','e','d','i','a','F','o','u','n','d','a','t','i','o','n','\\',
@@ -3023,3 +3040,201 @@ HRESULT WINAPI MFCreateMFByteStreamOnStreamEx(IUnknown *stream, IMFByteStream **
 
     return E_NOTIMPL;
 }
+
+static HRESULT WINAPI system_time_source_QueryInterface(IMFPresentationTimeSource *iface, REFIID riid, void **obj)
+{
+    struct system_time_source *source = impl_from_IMFPresentationTimeSource(iface);
+
+    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
+
+    if (IsEqualIID(riid, &IID_IMFPresentationTimeSource) ||
+            IsEqualIID(riid, &IID_IUnknown))
+    {
+        *obj = &source->IMFPresentationTimeSource_iface;
+    }
+    else if (IsEqualIID(riid, &IID_IMFClockStateSink))
+    {
+        *obj = &source->IMFClockStateSink_iface;
+    }
+    else
+    {
+        WARN("Unsupported %s.\n", debugstr_guid(riid));
+        *obj = NULL;
+        return E_NOINTERFACE;
+    }
+
+    IUnknown_AddRef((IUnknown *)*obj);
+    return S_OK;
+}
+
+static ULONG WINAPI system_time_source_AddRef(IMFPresentationTimeSource *iface)
+{
+    struct system_time_source *source = impl_from_IMFPresentationTimeSource(iface);
+    ULONG refcount = InterlockedIncrement(&source->refcount);
+
+    TRACE("%p, refcount %u.\n", iface, refcount);
+
+    return refcount;
+}
+
+static ULONG WINAPI system_time_source_Release(IMFPresentationTimeSource *iface)
+{
+    struct system_time_source *source = impl_from_IMFPresentationTimeSource(iface);
+    ULONG refcount = InterlockedDecrement(&source->refcount);
+
+    TRACE("%p, refcount %u.\n", iface, refcount);
+
+    if (!refcount)
+        heap_free(source);
+
+    return refcount;
+}
+
+static HRESULT WINAPI system_time_source_GetClockCharacteristics(IMFPresentationTimeSource *iface, DWORD *flags)
+{
+    TRACE("%p, %p.\n", iface, flags);
+
+    *flags = MFCLOCK_CHARACTERISTICS_FLAG_FREQUENCY_10MHZ | MFCLOCK_CHARACTERISTICS_FLAG_IS_SYSTEM_CLOCK;
+
+    return S_OK;
+}
+
+static HRESULT WINAPI system_time_source_GetCorrelatedTime(IMFPresentationTimeSource *iface, DWORD reserved,
+        LONGLONG *clock_time, MFTIME *system_time)
+{
+    FIXME("%p, %#x, %p, %p.\n", iface, reserved, clock_time, system_time);
+
+    return E_NOTIMPL;
+}
+
+
+static HRESULT WINAPI system_time_source_GetContinuityKey(IMFPresentationTimeSource *iface, DWORD *key)
+{
+    TRACE("%p, %p.\n", iface, key);
+
+    *key = 0;
+
+    return S_OK;
+}
+
+static HRESULT WINAPI system_time_source_GetState(IMFPresentationTimeSource *iface, DWORD reserved,
+        MFCLOCK_STATE *state)
+{
+    FIXME("%p, %#x, %p.\n", iface, reserved, state);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_GetProperties(IMFPresentationTimeSource *iface, MFCLOCK_PROPERTIES *props)
+{
+    FIXME("%p, %p.\n", iface, props);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_GetUnderlyingClock(IMFPresentationTimeSource *iface, IMFClock **clock)
+{
+    FIXME("%p, %p.\n", iface, clock);
+
+    return E_NOTIMPL;
+}
+
+static const IMFPresentationTimeSourceVtbl systemtimesourcevtbl =
+{
+    system_time_source_QueryInterface,
+    system_time_source_AddRef,
+    system_time_source_Release,
+    system_time_source_GetClockCharacteristics,
+    system_time_source_GetCorrelatedTime,
+    system_time_source_GetContinuityKey,
+    system_time_source_GetState,
+    system_time_source_GetProperties,
+    system_time_source_GetUnderlyingClock,
+};
+
+static HRESULT WINAPI system_time_source_sink_QueryInterface(IMFClockStateSink *iface, REFIID riid, void **out)
+{
+    struct system_time_source *source = impl_from_IMFClockStateSink(iface);
+    return IMFPresentationTimeSource_QueryInterface(&source->IMFPresentationTimeSource_iface, riid, out);
+}
+
+static ULONG WINAPI system_time_source_sink_AddRef(IMFClockStateSink *iface)
+{
+    struct system_time_source *source = impl_from_IMFClockStateSink(iface);
+    return IMFPresentationTimeSource_AddRef(&source->IMFPresentationTimeSource_iface);
+}
+
+static ULONG WINAPI system_time_source_sink_Release(IMFClockStateSink *iface)
+{
+    struct system_time_source *source = impl_from_IMFClockStateSink(iface);
+    return IMFPresentationTimeSource_Release(&source->IMFPresentationTimeSource_iface);
+}
+
+static HRESULT WINAPI system_time_source_sink_OnClockStart(IMFClockStateSink *iface, MFTIME system_time, LONGLONG start_offset)
+{
+    FIXME("%p, %s, %s.\n", iface, wine_dbgstr_longlong(system_time), wine_dbgstr_longlong(start_offset));
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_sink_OnClockStop(IMFClockStateSink *iface, MFTIME system_time)
+{
+    FIXME("%p, %s.\n", iface, wine_dbgstr_longlong(system_time));
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_sink_OnClockPause(IMFClockStateSink *iface, MFTIME system_time)
+{
+    FIXME("%p, %s.\n", iface, wine_dbgstr_longlong(system_time));
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_sink_OnClockRestart(IMFClockStateSink *iface, MFTIME system_time)
+{
+    FIXME("%p, %s.\n", iface, wine_dbgstr_longlong(system_time));
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI system_time_source_sink_OnClockSetRate(IMFClockStateSink *iface, MFTIME system_time, float rate)
+{
+    FIXME("%p, %s, %f.\n", iface, wine_dbgstr_longlong(system_time), rate);
+
+    return E_NOTIMPL;
+}
+
+static const IMFClockStateSinkVtbl systemtimesourcesinkvtbl =
+{
+    system_time_source_sink_QueryInterface,
+    system_time_source_sink_AddRef,
+    system_time_source_sink_Release,
+    system_time_source_sink_OnClockStart,
+    system_time_source_sink_OnClockStop,
+    system_time_source_sink_OnClockPause,
+    system_time_source_sink_OnClockRestart,
+    system_time_source_sink_OnClockSetRate,
+};
+
+/***********************************************************************
+ *      MFCreateSystemTimeSource (mfplat.@)
+ */
+HRESULT WINAPI MFCreateSystemTimeSource(IMFPresentationTimeSource **time_source)
+{
+    struct system_time_source *object;
+
+    TRACE("%p.\n", time_source);
+
+    object = heap_alloc(sizeof(*object));
+    if (!object)
+        return E_OUTOFMEMORY;
+
+    object->IMFPresentationTimeSource_iface.lpVtbl = &systemtimesourcevtbl;
+    object->IMFClockStateSink_iface.lpVtbl = &systemtimesourcesinkvtbl;
+    object->refcount = 1;
+
+    *time_source = &object->IMFPresentationTimeSource_iface;
+
+    return S_OK;
+}
diff --git a/dlls/mfplat/mfplat.spec b/dlls/mfplat/mfplat.spec
index 900efc37804..c47af72ed87 100644
--- a/dlls/mfplat/mfplat.spec
+++ b/dlls/mfplat/mfplat.spec
@@ -61,7 +61,7 @@
 @ stub MFCreateSocketListener
 @ stdcall MFCreateSourceResolver(ptr)
 @ stdcall MFCreateStreamDescriptor(long long ptr ptr)
-@ stub MFCreateSystemTimeSource
+@ stdcall MFCreateSystemTimeSource(ptr)
 @ stub MFCreateSystemUnderlyingClock
 @ stub MFCreateTempFile
 @ stub MFCreateTransformActivate
diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index 19ec6ec6d13..cb3f2a9e7d0 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -1598,6 +1598,39 @@ static void test_presentation_descriptor(void)
     IMFMediaType_Release(media_type);
 }
 
+static void test_system_time_source(void)
+{
+    IMFPresentationTimeSource *time_source;
+    IMFClockStateSink *statesink;
+    MFCLOCK_STATE state;
+    DWORD value;
+    HRESULT hr;
+
+    hr = MFCreateSystemTimeSource(&time_source);
+    ok(hr == S_OK, "Failed to create time source, hr %#x.\n", hr);
+
+    hr = IMFPresentationTimeSource_GetClockCharacteristics(time_source, &value);
+    ok(hr == S_OK, "Failed to get flags, hr %#x.\n", hr);
+    ok(value == (MFCLOCK_CHARACTERISTICS_FLAG_FREQUENCY_10MHZ | MFCLOCK_CHARACTERISTICS_FLAG_IS_SYSTEM_CLOCK),
+            "Unexpected flags %#x.\n", value);
+
+    value = 1;
+    hr = IMFPresentationTimeSource_GetContinuityKey(time_source, &value);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    ok(value == 0, "Unexpected value %u.\n", value);
+
+    hr = IMFPresentationTimeSource_GetState(time_source, 0, &state);
+todo_wine {
+    ok(hr == S_OK, "Failed to get state, hr %#x.\n", hr);
+    ok(state == MFCLOCK_STATE_INVALID, "Unexpected state %d.\n", state);
+}
+    hr = IMFPresentationTimeSource_QueryInterface(time_source, &IID_IMFClockStateSink, (void **)&statesink);
+    ok(hr == S_OK, "Failed to get state sink, hr %#x.\n", hr);
+    IMFClockStateSink_Release(statesink);
+
+    IMFPresentationTimeSource_Release(time_source);
+}
+
 START_TEST(mfplat)
 {
     CoInitialize(NULL);
@@ -1624,6 +1657,7 @@ START_TEST(mfplat)
     test_periodic_callback();
     test_event_queue();
     test_presentation_descriptor();
+    test_system_time_source();
 
     CoUninitialize();
 }
diff --git a/include/mfidl.idl b/include/mfidl.idl
index 21157ee95de..252099e145a 100644
--- a/include/mfidl.idl
+++ b/include/mfidl.idl
@@ -57,6 +57,13 @@ typedef struct _MFCLOCK_PROPERTIES
     DWORD            dwClockJitter;
 } MFCLOCK_PROPERTIES;
 
+typedef enum _MFCLOCK_CHARACTERISTICS_FLAGS
+{
+    MFCLOCK_CHARACTERISTICS_FLAG_FREQUENCY_10MHZ = 0x00000002,
+    MFCLOCK_CHARACTERISTICS_FLAG_ALWAYS_RUNNING  = 0x00000004,
+    MFCLOCK_CHARACTERISTICS_FLAG_IS_SYSTEM_CLOCK = 0x00000008,
+} MFCLOCK_CHARACTERISTICS_FLAGS;
+
 [
     object,
     uuid(2eb1e945-18b8-4139-9b1a-d5d584818530),
@@ -357,6 +364,7 @@ cpp_quote("HRESULT WINAPI MFCreateSequencerSource(IUnknown *reserved, IMFSequenc
 cpp_quote("HRESULT WINAPI MFCreateSourceResolver(IMFSourceResolver **resolver);")
 cpp_quote("HRESULT WINAPI MFCreateStreamDescriptor(DWORD identifier, DWORD cMediaTypes,")
 cpp_quote("     IMFMediaType **types, IMFStreamDescriptor **descriptor);")
+cpp_quote("HRESULT WINAPI MFCreateSystemTimeSource(IMFPresentationTimeSource **time_source);")
 cpp_quote("HRESULT WINAPI MFCreateTopology(IMFTopology **topology);")
 cpp_quote("HRESULT WINAPI MFCreateTopologyNode(MF_TOPOLOGY_TYPE node_type, IMFTopologyNode **node);")
 cpp_quote("HRESULT WINAPI MFCreateTopoLoader(IMFTopoLoader **loader);")