diff --git a/dlls/mfplat/mediatype.c b/dlls/mfplat/mediatype.c
index 2bf9b674ea7..7c252147679 100644
--- a/dlls/mfplat/mediatype.c
+++ b/dlls/mfplat/mediatype.c
@@ -3316,3 +3316,91 @@ DWORD WINAPI MFMapDXGIFormatToDX9Format(DXGI_FORMAT dxgi_format)
             return 0;
     }
 }
+
+/***********************************************************************
+ *      MFMapDX9FormatToDXGIFormat (mfplat.@)
+ */
+DXGI_FORMAT WINAPI MFMapDX9FormatToDXGIFormat(DWORD format)
+{
+    switch (format)
+    {
+        case D3DFMT_A32B32G32R32F:
+            return DXGI_FORMAT_R32G32B32A32_FLOAT;
+        case D3DFMT_A16B16G16R16F:
+            return DXGI_FORMAT_R16G16B16A16_FLOAT;
+        case D3DFMT_A16B16G16R16:
+            return DXGI_FORMAT_R16G16B16A16_UNORM;
+        case D3DFMT_Q16W16V16U16:
+            return DXGI_FORMAT_R16G16B16A16_SNORM;
+        case D3DFMT_G32R32F:
+            return DXGI_FORMAT_R32G32_FLOAT;
+        case D3DFMT_A2B10G10R10:
+            return DXGI_FORMAT_R10G10B10A2_UNORM;
+        case D3DFMT_Q8W8V8U8:
+            return DXGI_FORMAT_R8G8B8A8_SNORM;
+        case D3DFMT_G16R16F:
+            return DXGI_FORMAT_R16G16_FLOAT;
+        case D3DFMT_G16R16:
+            return DXGI_FORMAT_R16G16_UNORM;
+        case D3DFMT_V16U16:
+            return DXGI_FORMAT_R16G16_SNORM;
+        case D3DFMT_D32F_LOCKABLE:
+            return DXGI_FORMAT_D32_FLOAT;
+        case D3DFMT_R32F:
+            return DXGI_FORMAT_R32_FLOAT;
+        case D3DFMT_D24S8:
+            return DXGI_FORMAT_D24_UNORM_S8_UINT;
+        case D3DFMT_V8U8:
+            return DXGI_FORMAT_R8G8_SNORM;
+        case D3DFMT_R16F:
+            return DXGI_FORMAT_R16_FLOAT;
+        case D3DFMT_L16:
+            return DXGI_FORMAT_R16_UNORM;
+        case D3DFMT_L8:
+            return DXGI_FORMAT_R8_UNORM;
+        case D3DFMT_A8:
+            return DXGI_FORMAT_A8_UNORM;
+        case D3DFMT_DXT1:
+            return DXGI_FORMAT_BC1_UNORM;
+        case D3DFMT_DXT2:
+            return DXGI_FORMAT_BC2_UNORM;
+        case D3DFMT_DXT4:
+            return DXGI_FORMAT_BC3_UNORM;
+        case D3DFMT_A8R8G8B8:
+            return DXGI_FORMAT_B8G8R8A8_UNORM;
+        case D3DFMT_X8R8G8B8:
+            return DXGI_FORMAT_B8G8R8X8_UNORM;
+        case MAKEFOURCC('A','Y','U','V'):
+            return DXGI_FORMAT_AYUV;
+        case MAKEFOURCC('Y','4','1','0'):
+            return DXGI_FORMAT_Y410;
+        case MAKEFOURCC('Y','4','1','6'):
+            return DXGI_FORMAT_Y416;
+        case MAKEFOURCC('N','V','1','2'):
+            return DXGI_FORMAT_NV12;
+        case MAKEFOURCC('P','0','1','0'):
+            return DXGI_FORMAT_P010;
+        case MAKEFOURCC('P','0','1','6'):
+            return DXGI_FORMAT_P016;
+        case MAKEFOURCC('4','2','0','O'):
+            return DXGI_FORMAT_420_OPAQUE;
+        case D3DFMT_YUY2:
+            return DXGI_FORMAT_YUY2;
+        case MAKEFOURCC('Y','2','1','0'):
+            return DXGI_FORMAT_Y210;
+        case MAKEFOURCC('Y','2','1','6'):
+            return DXGI_FORMAT_Y216;
+        case MAKEFOURCC('N','V','1','1'):
+            return DXGI_FORMAT_NV11;
+        case MAKEFOURCC('A','I','4','4'):
+            return DXGI_FORMAT_AI44;
+        case MAKEFOURCC('I','A','4','4'):
+            return DXGI_FORMAT_IA44;
+        case D3DFMT_P8:
+            return DXGI_FORMAT_P8;
+        case D3DFMT_A8P8:
+            return DXGI_FORMAT_A8P8;
+        default:
+            return DXGI_FORMAT_UNKNOWN;
+    }
+}
diff --git a/dlls/mfplat/mfplat.spec b/dlls/mfplat/mfplat.spec
index 8ef40dd20c8..809903c4b22 100644
--- a/dlls/mfplat/mfplat.spec
+++ b/dlls/mfplat/mfplat.spec
@@ -131,6 +131,7 @@
 @ stdcall MFJoinWorkQueue(long long ptr) rtworkq.RtwqJoinWorkQueue
 @ stdcall MFLockPlatform() rtworkq.RtwqLockPlatform
 @ stdcall MFLockWorkQueue(long) rtworkq.RtwqLockWorkQueue
+@ stdcall MFMapDX9FormatToDXGIFormat(long)
 @ stdcall MFMapDXGIFormatToDX9Format(long)
 @ stdcall MFPutWaitingWorkItem(long long ptr ptr) rtworkq.RtwqPutWaitingWorkItem
 @ stdcall MFPutWorkItem(long ptr ptr)
diff --git a/dlls/mfplat/tests/mfplat.c b/dlls/mfplat/tests/mfplat.c
index 3f4dd48b2a8..949e8e5feed 100644
--- a/dlls/mfplat/tests/mfplat.c
+++ b/dlls/mfplat/tests/mfplat.c
@@ -131,6 +131,7 @@ static HRESULT (WINAPI *pMFCreateMediaBufferFromMediaType)(IMFMediaType *media_t
 static HRESULT (WINAPI *pMFCreateDXSurfaceBuffer)(REFIID riid, IUnknown *surface, BOOL bottom_up, IMFMediaBuffer **buffer);
 static HRESULT (WINAPI *pMFCreateTrackedSample)(IMFTrackedSample **sample);
 static DWORD (WINAPI *pMFMapDXGIFormatToDX9Format)(DXGI_FORMAT dxgi_format);
+static DXGI_FORMAT (WINAPI *pMFMapDX9FormatToDXGIFormat)(DWORD format);
 static HRESULT (WINAPI *pMFCreateVideoSampleAllocatorEx)(REFIID riid, void **allocator);
 static HRESULT (WINAPI *pMFCreateDXGISurfaceBuffer)(REFIID riid, IUnknown *surface, UINT subresource, BOOL bottomup,
         IMFMediaBuffer **buffer);
@@ -800,6 +801,7 @@ static void init_functions(void)
     X(MFCreateVideoSampleAllocatorEx);
     X(MFGetPlaneSize);
     X(MFGetStrideForBitmapInfoHeader);
+    X(MFMapDX9FormatToDXGIFormat);
     X(MFMapDXGIFormatToDX9Format);
     X(MFPutWaitingWorkItem);
     X(MFRegisterLocalByteStreamHandler);
@@ -6038,6 +6040,71 @@ static void test_MFMapDXGIFormatToDX9Format(void)
     }
 }
 
+static void test_MFMapDX9FormatToDXGIFormat(void)
+{
+    static const struct format_pair
+    {
+        DXGI_FORMAT dxgi_format;
+        DWORD d3d9_format;
+    }
+    formats_map[] =
+    {
+        { DXGI_FORMAT_R32G32B32A32_FLOAT, D3DFMT_A32B32G32R32F },
+        { DXGI_FORMAT_R16G16B16A16_FLOAT, D3DFMT_A16B16G16R16F },
+        { DXGI_FORMAT_R16G16B16A16_UNORM, D3DFMT_A16B16G16R16 },
+        { DXGI_FORMAT_R16G16B16A16_SNORM, D3DFMT_Q16W16V16U16 },
+        { DXGI_FORMAT_R32G32_FLOAT, D3DFMT_G32R32F },
+        { DXGI_FORMAT_R10G10B10A2_UNORM, D3DFMT_A2B10G10R10 },
+        { DXGI_FORMAT_R8G8B8A8_SNORM, D3DFMT_Q8W8V8U8 },
+        { DXGI_FORMAT_R16G16_FLOAT, D3DFMT_G16R16F },
+        { DXGI_FORMAT_R16G16_UNORM, D3DFMT_G16R16 },
+        { DXGI_FORMAT_R16G16_SNORM, D3DFMT_V16U16 },
+        { DXGI_FORMAT_D32_FLOAT, D3DFMT_D32F_LOCKABLE },
+        { DXGI_FORMAT_R32_FLOAT, D3DFMT_R32F },
+        { DXGI_FORMAT_D24_UNORM_S8_UINT, D3DFMT_D24S8 },
+        { DXGI_FORMAT_R8G8_SNORM, D3DFMT_V8U8 },
+        { DXGI_FORMAT_R16_FLOAT, D3DFMT_R16F },
+        { DXGI_FORMAT_R16_UNORM, D3DFMT_L16 },
+        { DXGI_FORMAT_R8_UNORM, D3DFMT_L8 },
+        { DXGI_FORMAT_A8_UNORM, D3DFMT_A8 },
+        { DXGI_FORMAT_BC1_UNORM, D3DFMT_DXT1 },
+        { DXGI_FORMAT_BC2_UNORM, D3DFMT_DXT2 },
+        { DXGI_FORMAT_BC3_UNORM, D3DFMT_DXT4 },
+        { DXGI_FORMAT_B8G8R8A8_UNORM, D3DFMT_A8R8G8B8 },
+        { DXGI_FORMAT_B8G8R8X8_UNORM, D3DFMT_X8R8G8B8 },
+        { DXGI_FORMAT_AYUV, MAKEFOURCC('A','Y','U','V') },
+        { DXGI_FORMAT_Y410, MAKEFOURCC('Y','4','1','0') },
+        { DXGI_FORMAT_Y416, MAKEFOURCC('Y','4','1','6') },
+        { DXGI_FORMAT_NV12, MAKEFOURCC('N','V','1','2') },
+        { DXGI_FORMAT_P010, MAKEFOURCC('P','0','1','0') },
+        { DXGI_FORMAT_P016, MAKEFOURCC('P','0','1','6') },
+        { DXGI_FORMAT_420_OPAQUE, MAKEFOURCC('4','2','0','O') },
+        { DXGI_FORMAT_YUY2, D3DFMT_YUY2 },
+        { DXGI_FORMAT_Y210, MAKEFOURCC('Y','2','1','0') },
+        { DXGI_FORMAT_Y216, MAKEFOURCC('Y','2','1','6') },
+        { DXGI_FORMAT_NV11, MAKEFOURCC('N','V','1','1') },
+        { DXGI_FORMAT_AI44, MAKEFOURCC('A','I','4','4') },
+        { DXGI_FORMAT_IA44, MAKEFOURCC('I','A','4','4') },
+        { DXGI_FORMAT_P8, D3DFMT_P8 },
+        { DXGI_FORMAT_A8P8, D3DFMT_A8P8 },
+    };
+    DXGI_FORMAT format;
+    unsigned int i;
+
+    if (!pMFMapDX9FormatToDXGIFormat)
+    {
+        win_skip("MFMapDX9FormatToDXGIFormat() is not available.\n");
+        return;
+    }
+
+    for (i = 0; i < ARRAY_SIZE(formats_map); ++i)
+    {
+        format = pMFMapDX9FormatToDXGIFormat(formats_map[i].d3d9_format);
+        ok(format == formats_map[i].dxgi_format, "Unexpected DXGI format %#x, d3d9 format %#x.\n",
+                format, formats_map[i].d3d9_format);
+    }
+}
+
 static HRESULT WINAPI test_notify_callback_QueryInterface(IMFVideoSampleAllocatorNotify *iface,
         REFIID riid, void **obj)
 {
@@ -6506,6 +6573,7 @@ START_TEST(mfplat)
     test_MFMapDXGIFormatToDX9Format();
     test_dxgi_surface_buffer();
     test_sample_allocator();
+    test_MFMapDX9FormatToDXGIFormat();
 
     CoUninitialize();
 }
diff --git a/include/mfapi.h b/include/mfapi.h
index 25602a7cd94..d6969984da7 100644
--- a/include/mfapi.h
+++ b/include/mfapi.h
@@ -553,6 +553,7 @@ HRESULT WINAPI MFInitAttributesFromBlob(IMFAttributes *attributes, const UINT8 *
 HRESULT WINAPI MFInitMediaTypeFromWaveFormatEx(IMFMediaType *mediatype, const WAVEFORMATEX *format, UINT32 size);
 HRESULT WINAPI MFInvokeCallback(IMFAsyncResult *result);
 HRESULT WINAPI MFLockPlatform(void);
+DXGI_FORMAT WINAPI MFMapDX9FormatToDXGIFormat(DWORD format);
 DWORD WINAPI MFMapDXGIFormatToDX9Format(DXGI_FORMAT dxgi_format);
 HRESULT WINAPI MFPutWaitingWorkItem(HANDLE event, LONG priority, IMFAsyncResult *result, MFWORKITEM_KEY *key);
 HRESULT WINAPI MFPutWorkItem(DWORD queue, IMFAsyncCallback *callback, IUnknown *state);