mmdevapi: Implement IAudioClient3_InitializeSharedAudioStream.

dlls/mmdevapi/client.c

@@ -950,8 +950,14 @@ static HRESULT WINAPI client_InitializeSharedAudioStream(IAudioClient3 *iface, D
                                                   const GUID *session_guid)
 {
     struct audio_client *This = impl_from_IAudioClient3(iface);
-    FIXME("(%p)->(0x%lx, %u, %p, %s) - stub\n", This, flags, period_frames, format, debugstr_guid(session_guid));
-    return E_NOTIMPL;
+    REFERENCE_TIME duration;
+    FIXME("(%p)->(0x%lx, %u, %p, %s) - partial stub\n", This, flags, period_frames, format, debugstr_guid(session_guid));
+
+    if (!format)
+        return E_POINTER;
+
+    duration = period_frames * (REFERENCE_TIME)10000000 / format->nSamplesPerSec;
+    return client_Initialize(iface, AUDCLNT_SHAREMODE_SHARED, flags, duration, 0, format, session_guid);
 }
 
 const IAudioClient3Vtbl AudioClient3_Vtbl =

dlls/mmdevapi/tests/render.c

@@ -351,7 +351,6 @@ static void test_audioclient(void)
 
         hr = IAudioClient3_InitializeSharedAudioStream(
             ac3, AUDCLNT_SHAREMODE_SHARED, default_period, pwfx, NULL);
-        todo_wine
         ok(hr == S_OK, "InitializeSharedAudioStream returns %08lx\n", hr);
 
         IAudioClient3_Release(ac3);