mmdevapi: Stub implement IAudioClient2.

dlls/mmdevapi/devenum.c

@@ -591,7 +591,8 @@ static HRESULT WINAPI MMDevice_Activate(IMMDevice *iface, REFIID riid, DWORD cls
     if (!ppv)
         return E_POINTER;
 
-    if (IsEqualIID(riid, &IID_IAudioClient)){
+    if (IsEqualIID(riid, &IID_IAudioClient) ||
+            IsEqualIID(riid, &IID_IAudioClient2)){
         hr = drvs.pGetAudioEndpoint(&This->devguid, iface, (IAudioClient**)ppv);
     }else if (IsEqualIID(riid, &IID_IAudioEndpointVolume) ||
             IsEqualIID(riid, &IID_IAudioEndpointVolumeEx))

dlls/mmdevapi/tests/render.c

@@ -133,6 +133,7 @@ static void test_uninitialized(IAudioClient *ac)
 static void test_audioclient(void)
 {
     IAudioClient *ac;
+    IAudioClient2 *ac2;
     IUnknown *unk;
     HRESULT hr;
     ULONG ref;
@@ -140,6 +141,11 @@ static void test_audioclient(void)
     REFERENCE_TIME t1, t2;
     HANDLE handle;
 
+    hr = IMMDevice_Activate(dev, &IID_IAudioClient2, CLSCTX_INPROC_SERVER,
+            NULL, (void**)&ac2);
+    ok(hr == S_OK, "IAudioClient2 Activation failed with %08x\n", hr);
+    IAudioClient2_Release(ac2);
+
     hr = IMMDevice_Activate(dev, &IID_IAudioClient, CLSCTX_INPROC_SERVER,
             NULL, (void**)&ac);
     ok(hr == S_OK, "Activation failed with %08x\n", hr);
@@ -244,6 +250,11 @@ static void test_audioclient(void)
            "IsFormatSupported(0xffffffff) call returns %08x\n", hr);
     }
 
+    hr = IAudioClient_QueryInterface(ac, &IID_IAudioClient2, (void**)&ac2);
+    ok(hr == S_OK, "Failed to query IAudioClient2 interface: %08x\n", hr);
+
+    IAudioClient2_Release(ac2);
+
     test_uninitialized(ac);
 
     hr = IAudioClient_Initialize(ac, 3, 0, 5000000, 0, pwfx, NULL);