winegstreamer: Add stub Video Processor MFT.

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/mf/tests/mf.c

@@ -2079,11 +2079,11 @@ static void test_video_processor(void)
 
     hr = CoCreateInstance(&CLSID_VideoProcessorMFT, NULL, CLSCTX_INPROC_SERVER, &IID_IMFTransform,
             (void **)&transform);
-todo_wine
-    ok(hr == S_OK || broken(hr == REGDB_E_CLASSNOTREG), "Failed to create video processor transform, hr %#x.\n", hr);
-
     if (FAILED(hr))
+    {
+        skip("Failed to create Video Processor instance, skipping tests.\n");
         goto failed;
+    }
 
     hr = IMFTransform_QueryInterface(transform, &IID_IMFMediaEventGenerator, (void **)&unk);
     ok(hr == E_NOINTERFACE, "Unexpected hr %#x.\n", hr);
@@ -2120,12 +2120,14 @@ todo_wine
     ok(hr == E_NOTIMPL, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetInputStatus(transform, 0, &flags);
+todo_wine
     ok(hr == MF_E_TRANSFORM_TYPE_NOT_SET, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetInputStreamAttributes(transform, 0, &attributes);
     ok(hr == E_NOTIMPL, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetOutputStatus(transform, &flags);
+todo_wine
     ok(hr == MF_E_TRANSFORM_TYPE_NOT_SET, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetOutputStreamAttributes(transform, 0, &attributes);
@@ -2137,30 +2139,38 @@ todo_wine
     IMFAttributes_Release(attributes2);
 
     hr = IMFTransform_GetOutputAvailableType(transform, 0, 0, &media_type);
+todo_wine
     ok(hr == MF_E_NO_MORE_TYPES, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetInputCurrentType(transform, 0, &media_type);
+todo_wine
     ok(hr == MF_E_TRANSFORM_TYPE_NOT_SET, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetInputCurrentType(transform, 1, &media_type);
+todo_wine
     ok(hr == MF_E_INVALIDSTREAMNUMBER, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetOutputCurrentType(transform, 0, &media_type);
+todo_wine
     ok(hr == MF_E_TRANSFORM_TYPE_NOT_SET, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetOutputCurrentType(transform, 1, &media_type);
+todo_wine
     ok(hr == MF_E_INVALIDSTREAMNUMBER, "Unexpected hr %#x.\n", hr);
 
     hr = IMFTransform_GetInputStreamInfo(transform, 1, &input_info);
+todo_wine
     ok(hr == MF_E_INVALIDSTREAMNUMBER, "Unexpected hr %#x.\n", hr);
 
+    memset(&input_info, 0xcc, sizeof(input_info));
     hr = IMFTransform_GetInputStreamInfo(transform, 0, &input_info);
+todo_wine {
     ok(hr == S_OK, "Failed to get stream info, hr %#x.\n", hr);
     ok(input_info.dwFlags == 0, "Unexpected flag %#x.\n", input_info.dwFlags);
     ok(input_info.cbSize == 0, "Unexpected size %u.\n", input_info.cbSize);
     ok(input_info.cbMaxLookahead == 0, "Unexpected lookahead length %u.\n", input_info.cbMaxLookahead);
     ok(input_info.cbAlignment == 0, "Unexpected alignment %u.\n", input_info.cbAlignment);
-
+}
     hr = MFCreateMediaEvent(MEUnknown, &GUID_NULL, S_OK, NULL, &event);
     ok(hr == S_OK, "Failed to create event object, hr %#x.\n", hr);
     hr = IMFTransform_ProcessEvent(transform, 0, event);
@@ -2174,6 +2184,7 @@ todo_wine
     {
         if (FAILED(hr = IMFTransform_GetInputAvailableType(transform, 0, i, &media_type)))
         {
+        todo_wine
             ok(hr == MF_E_NO_MORE_TYPES, "Unexpected hr %#x.\n", hr);
             break;
         }
@@ -2254,17 +2265,22 @@ todo_wine
     ok(hr == S_OK, "Failed to set attribute, hr %#x.\n", hr);
 
     hr = IMFTransform_SetInputType(transform, 0, media_type, 0);
+todo_wine
     ok(hr == S_OK, "Failed to set input type, hr %#x.\n", hr);
 
     hr = IMFMediaType_SetGUID(media_type, &MF_MT_SUBTYPE, &MFVideoFormat_RGB32);
     ok(hr == S_OK, "Failed to set attribute, hr %#x.\n", hr);
 
     hr = IMFTransform_SetOutputType(transform, 0, media_type, 0);
+todo_wine
     ok(hr == S_OK, "Failed to set output type, hr %#x.\n", hr);
 
+    memset(&output_info, 0, sizeof(output_info));
     hr = IMFTransform_GetOutputStreamInfo(transform, 0, &output_info);
+todo_wine
     ok(hr == S_OK, "Failed to get stream info, hr %#x.\n", hr);
     ok(output_info.dwFlags == 0, "Unexpected flags %#x.\n", output_info.dwFlags);
+todo_wine
     ok(output_info.cbSize > 0, "Unexpected size %u.\n", output_info.cbSize);
     ok(output_info.cbAlignment == 0, "Unexpected alignment %u.\n", output_info.cbAlignment);
 
@@ -2278,20 +2294,24 @@ todo_wine
     output_buffer.pSample = sample;
     flags = 0;
     hr = IMFTransform_ProcessOutput(transform, 0, 1, &output_buffer, &flags);
+todo_wine
     ok(hr == MF_E_TRANSFORM_NEED_MORE_INPUT, "Unexpected hr %#x.\n", hr);
     ok(output_buffer.dwStatus == 0, "Unexpected buffer status, %#x.\n", output_buffer.dwStatus);
     ok(flags == 0, "Unexpected status %#x.\n", flags);
 
     hr = IMFTransform_ProcessInput(transform, 0, sample2, 0);
+todo_wine
     ok(hr == S_OK, "Failed to push a sample, hr %#x.\n", hr);
 
     hr = IMFTransform_ProcessInput(transform, 0, sample2, 0);
+todo_wine
     ok(hr == MF_E_NOTACCEPTING, "Unexpected hr %#x.\n", hr);
 
     memset(&output_buffer, 0, sizeof(output_buffer));
     output_buffer.pSample = sample;
     flags = 0;
     hr = IMFTransform_ProcessOutput(transform, 0, 1, &output_buffer, &flags);
+todo_wine
     ok(hr == MF_E_NO_SAMPLE_TIMESTAMP, "Unexpected hr %#x.\n", hr);
     ok(output_buffer.dwStatus == 0, "Unexpected buffer status, %#x.\n", output_buffer.dwStatus);
     ok(flags == 0, "Unexpected status %#x.\n", flags);
@@ -2302,6 +2322,7 @@ todo_wine
     output_buffer.pSample = sample;
     flags = 0;
     hr = IMFTransform_ProcessOutput(transform, 0, 1, &output_buffer, &flags);
+todo_wine
     ok(hr == E_INVALIDARG, "Unexpected hr %#x.\n", hr);
     ok(output_buffer.dwStatus == 0, "Unexpected buffer status, %#x.\n", output_buffer.dwStatus);
     ok(flags == 0, "Unexpected status %#x.\n", flags);
@@ -2319,6 +2340,7 @@ todo_wine
     output_buffer.pSample = sample;
     flags = 0;
     hr = IMFTransform_ProcessOutput(transform, 0, 1, &output_buffer, &flags);
+todo_wine
     ok(hr == S_OK || broken(FAILED(hr)) /* Win8 */, "Failed to get output buffer, hr %#x.\n", hr);
     ok(output_buffer.dwStatus == 0, "Unexpected buffer status, %#x.\n", output_buffer.dwStatus);
     ok(flags == 0, "Unexpected status %#x.\n", flags);

dlls/winegstreamer/Makefile.in

@@ -1,5 +1,5 @@
 MODULE    = winegstreamer.dll
-IMPORTS   = strmbase strmiids uuid winmm msacm32 msvfw32 ole32 oleaut32 user32 gdi32 advapi32
+IMPORTS   = strmbase strmiids uuid winmm msacm32 msvfw32 ole32 oleaut32 user32 gdi32 advapi32 mfplat mfuuid
 EXTRAINCL = $(GSTREAMER_CFLAGS)
 EXTRALIBS = $(GSTREAMER_LIBS) $(PTHREAD_LIBS)
 
@@ -7,7 +7,10 @@ C_SRCS = \
 	gst_cbs.c \
 	gstdemux.c \
 	gsttffilter.c \
-	main.c
+	main.c \
+	mfplat.c
+
+IDL_SRCS = mfplat.idl
 
 RC_SRCS = \
 	rsrc.rc

dlls/winegstreamer/gst_private.h

@@ -53,4 +53,7 @@ void start_dispatch_thread(void) DECLSPEC_HIDDEN;
 
 extern const char *media_quark_string DECLSPEC_HIDDEN;
 
+extern HRESULT mfplat_get_class_object(REFCLSID rclsid, REFIID riid, void **obj) DECLSPEC_HIDDEN;
+extern HRESULT mfplat_can_unload_now(void) DECLSPEC_HIDDEN;
+
 #endif /* __GST_PRIVATE_INCLUDED__ */

dlls/winegstreamer/main.c

@@ -232,7 +232,12 @@ BOOL WINAPI DllMain(HINSTANCE hInstDLL, DWORD fdwReason, LPVOID lpv)
  */
 HRESULT WINAPI DllCanUnloadNow(void)
 {
-    return STRMBASE_DllCanUnloadNow();
+    HRESULT hr = STRMBASE_DllCanUnloadNow();
+
+    if (hr == S_OK)
+        hr = mfplat_can_unload_now();
+
+    return hr;
 }
 
 /***********************************************************************
@@ -240,7 +245,12 @@ HRESULT WINAPI DllCanUnloadNow(void)
  */
 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
 {
-    return STRMBASE_DllGetClassObject( rclsid, riid, ppv );
+    HRESULT hr;
+
+    if (FAILED(hr = mfplat_get_class_object(rclsid, riid, ppv)))
+        hr = STRMBASE_DllGetClassObject( rclsid, riid, ppv );
+
+    return hr;
 }
 
 /* GStreamer common functions */

dlls/winegstreamer/mfplat.c

@@ -0,0 +1,444 @@
+/*
+ * Copyright 2019 Nikolay Sivov for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdarg.h>
+
+#define COBJMACROS
+#define NONAMELESSUNION
+
+#include "mfapi.h"
+#include "mfidl.h"
+
+#include "wine/debug.h"
+#include "wine/heap.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(mfplat);
+
+static LONG object_locks;
+
+struct video_processor
+{
+    IMFTransform IMFTransform_iface;
+    LONG refcount;
+    IMFAttributes *attributes;
+    IMFAttributes *output_attributes;
+};
+
+static struct video_processor *impl_video_processor_from_IMFTransform(IMFTransform *iface)
+{
+    return CONTAINING_RECORD(iface, struct video_processor, IMFTransform_iface);
+}
+
+static HRESULT WINAPI video_processor_QueryInterface(IMFTransform *iface, REFIID riid, void **obj)
+{
+    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
+
+    if (IsEqualIID(riid, &IID_IMFTransform) ||
+            IsEqualIID(riid, &IID_IUnknown))
+    {
+        *obj = iface;
+        IMFTransform_AddRef(iface);
+        return S_OK;
+    }
+
+    WARN("Unsupported %s.\n", debugstr_guid(riid));
+    *obj = NULL;
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI video_processor_AddRef(IMFTransform *iface)
+{
+    struct video_processor *transform = impl_video_processor_from_IMFTransform(iface);
+    ULONG refcount = InterlockedIncrement(&transform->refcount);
+
+    TRACE("%p, refcount %u.\n", iface, refcount);
+
+    return refcount;
+}
+
+static ULONG WINAPI video_processor_Release(IMFTransform *iface)
+{
+    struct video_processor *transform = impl_video_processor_from_IMFTransform(iface);
+    ULONG refcount = InterlockedDecrement(&transform->refcount);
+
+    TRACE("%p, refcount %u.\n", iface, refcount);
+
+    if (!refcount)
+    {
+        if (transform->attributes)
+            IMFAttributes_Release(transform->attributes);
+        if (transform->output_attributes)
+            IMFAttributes_Release(transform->output_attributes);
+        heap_free(transform);
+    }
+
+    return refcount;
+}
+
+static HRESULT WINAPI video_processor_GetStreamLimits(IMFTransform *iface, DWORD *input_minimum, DWORD *input_maximum,
+        DWORD *output_minimum, DWORD *output_maximum)
+{
+    TRACE("%p, %p, %p, %p, %p.\n", iface, input_minimum, input_maximum, output_minimum, output_maximum);
+
+    *input_minimum = *input_maximum = *output_minimum = *output_maximum = 1;
+
+    return S_OK;
+}
+
+static HRESULT WINAPI video_processor_GetStreamCount(IMFTransform *iface, DWORD *inputs, DWORD *outputs)
+{
+    TRACE("%p, %p, %p.\n", iface, inputs, outputs);
+
+    *inputs = *outputs = 1;
+
+    return S_OK;
+}
+
+static HRESULT WINAPI video_processor_GetStreamIDs(IMFTransform *iface, DWORD input_size, DWORD *inputs,
+        DWORD output_size, DWORD *outputs)
+{
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetInputStreamInfo(IMFTransform *iface, DWORD id, MFT_INPUT_STREAM_INFO *info)
+{
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetOutputStreamInfo(IMFTransform *iface, DWORD id, MFT_OUTPUT_STREAM_INFO *info)
+{
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetAttributes(IMFTransform *iface, IMFAttributes **attributes)
+{
+    struct video_processor *transform = impl_video_processor_from_IMFTransform(iface);
+
+    TRACE("%p, %p.\n", iface, attributes);
+
+    *attributes = transform->attributes;
+    IMFAttributes_AddRef(*attributes);
+
+    return S_OK;
+}
+
+static HRESULT WINAPI video_processor_GetInputStreamAttributes(IMFTransform *iface, DWORD id,
+        IMFAttributes **attributes)
+{
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetOutputStreamAttributes(IMFTransform *iface, DWORD id,
+        IMFAttributes **attributes)
+{
+    struct video_processor *transform = impl_video_processor_from_IMFTransform(iface);
+
+    TRACE("%p, %u, %p.\n", iface, id, attributes);
+
+    *attributes = transform->output_attributes;
+    IMFAttributes_AddRef(*attributes);
+
+    return S_OK;
+}
+
+static HRESULT WINAPI video_processor_DeleteInputStream(IMFTransform *iface, DWORD id)
+{
+    TRACE("%p, %u.\n", iface, id);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_AddInputStreams(IMFTransform *iface, DWORD streams, DWORD *ids)
+{
+    TRACE("%p, %u, %p.\n", iface, streams, ids);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetInputAvailableType(IMFTransform *iface, DWORD id, DWORD index,
+        IMFMediaType **type)
+{
+    FIXME("%p, %u, %u, %p.\n", iface, id, index, type);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetOutputAvailableType(IMFTransform *iface, DWORD id, DWORD index,
+        IMFMediaType **type)
+{
+    FIXME("%p, %u, %u, %p.\n", iface, id, index, type);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_SetInputType(IMFTransform *iface, DWORD id, IMFMediaType *type, DWORD flags)
+{
+    FIXME("%p, %u, %p, %#x.\n", iface, id, type, flags);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_SetOutputType(IMFTransform *iface, DWORD id, IMFMediaType *type, DWORD flags)
+{
+    FIXME("%p, %u, %p, %#x.\n", iface, id, type, flags);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetInputCurrentType(IMFTransform *iface, DWORD id, IMFMediaType **type)
+{
+    FIXME("%p, %u, %p.\n", iface, id, type);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetOutputCurrentType(IMFTransform *iface, DWORD id, IMFMediaType **type)
+{
+    FIXME("%p, %u, %p.\n", iface, id, type);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetInputStatus(IMFTransform *iface, DWORD id, DWORD *flags)
+{
+    FIXME("%p, %u, %p.\n", iface, id, flags);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_GetOutputStatus(IMFTransform *iface, DWORD *flags)
+{
+    FIXME("%p, %p.\n", iface, flags);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_SetOutputBounds(IMFTransform *iface, LONGLONG lower, LONGLONG upper)
+{
+    FIXME("%p, %s, %s.\n", iface, wine_dbgstr_longlong(lower), wine_dbgstr_longlong(upper));
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_ProcessEvent(IMFTransform *iface, DWORD id, IMFMediaEvent *event)
+{
+    TRACE("%p, %u, %p.\n", iface, id, event);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_ProcessMessage(IMFTransform *iface, MFT_MESSAGE_TYPE message, ULONG_PTR param)
+{
+    FIXME("%p, %u.\n", iface, message);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_ProcessInput(IMFTransform *iface, DWORD id, IMFSample *sample, DWORD flags)
+{
+    FIXME("%p, %u, %p, %#x.\n", iface, id, sample, flags);
+
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI video_processor_ProcessOutput(IMFTransform *iface, DWORD flags, DWORD count,
+        MFT_OUTPUT_DATA_BUFFER *samples, DWORD *status)
+{
+    FIXME("%p, %#x, %u, %p, %p.\n", iface, flags, count, samples, status);
+
+    return E_NOTIMPL;
+}
+
+static const IMFTransformVtbl video_processor_vtbl =
+{
+    video_processor_QueryInterface,
+    video_processor_AddRef,
+    video_processor_Release,
+    video_processor_GetStreamLimits,
+    video_processor_GetStreamCount,
+    video_processor_GetStreamIDs,
+    video_processor_GetInputStreamInfo,
+    video_processor_GetOutputStreamInfo,
+    video_processor_GetAttributes,
+    video_processor_GetInputStreamAttributes,
+    video_processor_GetOutputStreamAttributes,
+    video_processor_DeleteInputStream,
+    video_processor_AddInputStreams,
+    video_processor_GetInputAvailableType,
+    video_processor_GetOutputAvailableType,
+    video_processor_SetInputType,
+    video_processor_SetOutputType,
+    video_processor_GetInputCurrentType,
+    video_processor_GetOutputCurrentType,
+    video_processor_GetInputStatus,
+    video_processor_GetOutputStatus,
+    video_processor_SetOutputBounds,
+    video_processor_ProcessEvent,
+    video_processor_ProcessMessage,
+    video_processor_ProcessInput,
+    video_processor_ProcessOutput,
+};
+
+struct class_factory
+{
+    IClassFactory IClassFactory_iface;
+    LONG refcount;
+    HRESULT (*create_instance)(REFIID riid, void **obj);
+};
+
+static struct class_factory *impl_from_IClassFactory(IClassFactory *iface)
+{
+    return CONTAINING_RECORD(iface, struct class_factory, IClassFactory_iface);
+}
+
+static HRESULT WINAPI class_factory_QueryInterface(IClassFactory *iface, REFIID riid, void **obj)
+{
+    TRACE("%p, %s, %p.\n", iface, debugstr_guid(riid), obj);
+
+    if (IsEqualGUID(riid, &IID_IClassFactory) ||
+            IsEqualGUID(riid, &IID_IUnknown))
+    {
+        *obj = iface;
+        IClassFactory_AddRef(iface);
+        return S_OK;
+    }
+
+    WARN("%s is not supported.\n", debugstr_guid(riid));
+    *obj = NULL;
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI class_factory_AddRef(IClassFactory *iface)
+{
+    struct class_factory *factory = impl_from_IClassFactory(iface);
+    return InterlockedIncrement(&factory->refcount);
+}
+
+static ULONG WINAPI class_factory_Release(IClassFactory *iface)
+{
+    struct class_factory *factory = impl_from_IClassFactory(iface);
+    ULONG refcount = InterlockedDecrement(&factory->refcount);
+
+    if (!refcount)
+        heap_free(factory);
+
+    return refcount;
+}
+
+static HRESULT WINAPI class_factory_CreateInstance(IClassFactory *iface, IUnknown *outer, REFIID riid, void **obj)
+{
+    struct class_factory *factory = impl_from_IClassFactory(iface);
+
+    TRACE("%p, %p, %s, %p.\n", iface, outer, debugstr_guid(riid), obj);
+
+    if (outer)
+    {
+        *obj = NULL;
+        return CLASS_E_NOAGGREGATION;
+    }
+
+    return factory->create_instance(riid, obj);
+}
+
+static HRESULT WINAPI class_factory_LockServer(IClassFactory *iface, BOOL dolock)
+{
+    TRACE("%p, %d.\n", iface, dolock);
+
+    if (dolock)
+        InterlockedIncrement(&object_locks);
+    else
+        InterlockedDecrement(&object_locks);
+
+    return S_OK;
+}
+
+static const IClassFactoryVtbl class_factory_vtbl =
+{
+    class_factory_QueryInterface,
+    class_factory_AddRef,
+    class_factory_Release,
+    class_factory_CreateInstance,
+    class_factory_LockServer,
+};
+
+static HRESULT video_processor_create(REFIID riid, void **ret)
+{
+    struct video_processor *object;
+    HRESULT hr;
+
+    if (!(object = heap_alloc_zero(sizeof(*object))))
+        return E_OUTOFMEMORY;
+
+    object->IMFTransform_iface.lpVtbl = &video_processor_vtbl;
+    object->refcount = 1;
+
+    if (FAILED(hr = MFCreateAttributes(&object->attributes, 0)))
+        goto failed;
+
+    if (FAILED(hr = MFCreateAttributes(&object->output_attributes, 0)))
+        goto failed;
+
+    *ret = &object->IMFTransform_iface;
+    return S_OK;
+
+failed:
+
+    IMFTransform_Release(&object->IMFTransform_iface);
+    return hr;
+}
+
+static const struct class_object
+{
+    const GUID *clsid;
+    HRESULT (*create_instance)(REFIID riid, void **obj);
+}
+class_objects[] =
+{
+    { &CLSID_VideoProcessorMFT, &video_processor_create },
+};
+
+HRESULT mfplat_get_class_object(REFCLSID rclsid, REFIID riid, void **obj)
+{
+    struct class_factory *factory;
+    unsigned int i;
+    HRESULT hr;
+
+    for (i = 0; i < ARRAY_SIZE(class_objects); ++i)
+    {
+        if (IsEqualGUID(class_objects[i].clsid, rclsid))
+        {
+            if (!(factory = heap_alloc(sizeof(*factory))))
+                return E_OUTOFMEMORY;
+
+            factory->IClassFactory_iface.lpVtbl = &class_factory_vtbl;
+            factory->refcount = 1;
+            factory->create_instance = class_objects[i].create_instance;
+
+            hr = IClassFactory_QueryInterface(&factory->IClassFactory_iface, riid, obj);
+            IClassFactory_Release(&factory->IClassFactory_iface);
+            return hr;
+        }
+    }
+
+    return CLASS_E_CLASSNOTAVAILABLE;
+}
+
+HRESULT mfplat_can_unload_now(void)
+{
+    return !object_locks ? S_OK : S_FALSE;
+}

dlls/winegstreamer/mfplat.idl

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2019 Nikolay Sivov for CodeWeavers
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#pragma makedep register
+
+[
+    threading(both),
+    uuid(88753b26-5b24-49bd-b2e7-0c445c78c982)
+
+]
+coclass VideoProcessorMFT { }