Fixes https://bugs.winehq.org/show_bug.cgi?id=26808

---
 dlls/xaudio2_7/Makefile.in        |    2 
 dlls/xaudio2_7/xaudio_dll.c       |  300
++++++++++++++++++++++++++++++++++++-
 dlls/xaudio2_7/xaudio_classes.idl |   28 +++
 3 files changed, 319 insertions(+), 11 deletions(-)

xaudio_2.7.dll.IXAudio2_stub.patch

diff --git a/dlls/xaudio2_7/Makefile.in b/dlls/xaudio2_7/Makefile.in
index 853d1d6..6bdf362 100644
--- a/dlls/xaudio2_7/Makefile.in
+++ b/dlls/xaudio2_7/Makefile.in
@@ -3,3 +3,5 @@ IMPORTS   = advapi32 kernel32 ole32 user32 uuid
 
 C_SRCS = \
 	xaudio_dll.c
+
+IDL_SRCS = xaudio_classes.idl

diff --git a/dlls/xaudio2_7/xaudio_dll.c b/dlls/xaudio2_7/xaudio_dll.c
index c8b7904..07c4780 100644
--- a/dlls/xaudio2_7/xaudio_dll.c
+++ b/dlls/xaudio2_7/xaudio_dll.c
@@ -30,12 +30,15 @@
 #include "wine/debug.h"
 #include <propsys.h>
 #include "initguid.h"
+
 #include "xaudio2.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(xaudio2);
 
 static HINSTANCE instance;
 
+static HRESULT XAudio2_create(IUnknown *pUnkOuter, LPVOID *ppObj);
+
 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     TRACE("(%p, %d, %p)\n", hinstDLL, fdwReason, lpvReserved);
@@ -52,35 +55,310 @@ BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
     return TRUE;
 }
 
-HRESULT WINAPI DllCanUnloadNow(void)
+typedef struct {
+    IClassFactory IClassFactory_iface;
+    HRESULT (*pfnCreateInstance)(IUnknown *pUnkOuter, LPVOID *ppObj);

+} IClassFactoryImpl;
+
+static inline IClassFactoryImpl *impl_from_IClassFactory(IClassFactory *iface)
 {
-    return S_FALSE;
+    return CONTAINING_RECORD(iface, IClassFactoryImpl, IClassFactory_iface);
+}
+
+static HRESULT WINAPI XAudio2CF_QueryInterface(IClassFactory *iface, REFIID riid, void **ppobj)
+{
+    if(IsEqualGUID(riid, &IID_IUnknown)
+            || IsEqualGUID(riid, &IID_IClassFactory))
+    {
+        IClassFactory_AddRef(iface);
+        *ppobj = iface;
+        return S_OK;
+    }
+
+    *ppobj = NULL;
+    WARN("(%p)->(%s, %p): interface not found\n", iface, debugstr_guid(riid), ppobj);
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI XAudio2CF_AddRef(IClassFactory *iface)
+{
+    return 2;
+}
+
+static ULONG WINAPI XAudio2CF_Release(IClassFactory *iface)
+{
+    return 1;
 }
 
+static HRESULT WINAPI XAudio2CF_CreateInstance(IClassFactory *iface, IUnknown *pOuter,
+                                               REFIID riid, void **ppobj)
+{
+    IClassFactoryImpl *This = impl_from_IClassFactory(iface);
+    HRESULT hr;
+    LPUNKNOWN punk;

+
+    TRACE("(%p)->(%p,%s,%p)\n", This, pOuter, debugstr_guid(riid), ppobj);
+
+    *ppobj = NULL;
+    hr = This->pfnCreateInstance(pOuter, (LPVOID *) &punk);
+    if (FAILED(hr))
+        return hr;
+
+    hr = IUnknown_QueryInterface(punk, riid, ppobj);
+    IUnknown_Release(punk);
+    return hr;
+}
+
+static HRESULT WINAPI XAudio2CF_LockServer(IClassFactory *iface, BOOL dolock)
+{
+    IClassFactoryImpl *This = impl_from_IClassFactory(iface);
+    FIXME("(%p)->(%d): stub!\n", This, dolock);
+    return S_OK;
+}
+
+static const IClassFactoryVtbl XAudio2CF_Vtbl =
+{
+    XAudio2CF_QueryInterface,
+    XAudio2CF_AddRef,
+    XAudio2CF_Release,
+    XAudio2CF_CreateInstance,
+    XAudio2CF_LockServer
+};
+
+static IClassFactoryImpl xaudio2_cf = { { &XAudio2CF_Vtbl }, XAudio2_create };
+
 HRESULT WINAPI DllGetClassObject(REFCLSID rclsid, REFIID riid, LPVOID *ppv)
 {
+    IClassFactory *factory = NULL;
+
     TRACE("(%s, %s, %p)\n", debugstr_guid(rclsid), debugstr_guid(riid), ppv);
 
-    if (ppv == NULL) {
-        WARN("invalid parameter\n");
-        return E_INVALIDARG;
+    if(IsEqualGUID(rclsid, &CLSID_XAudio2)) {
+        factory = &xaudio2_cf.IClassFactory_iface;

     }
+    if(!factory) return CLASS_E_CLASSNOTAVAILABLE;
 
-    *ppv = NULL;
+    return IClassFactory_QueryInterface(factory, riid, ppv);
+}
 
-    WARN("(%s, %s, %p): no class found.\n", debugstr_guid(rclsid),
-         debugstr_guid(riid), ppv);
-    return CLASS_E_CLASSNOTAVAILABLE;
+HRESULT WINAPI DllCanUnloadNow(void)
+{
+    return S_FALSE;
 }
 
 HRESULT WINAPI DllRegisterServer(void)
 {
     TRACE("\n");
-    return __wine_register_resources( instance );
+    return __wine_register_resources(instance);
 }
 
 HRESULT WINAPI DllUnregisterServer(void)
 {
     TRACE("\n");
-    return __wine_unregister_resources( instance );
+    return __wine_unregister_resources(instance);
+}
+
+typedef struct {
+    IXAudio2 IXAudio2Impl_iface;
+    LONG ref;
+} IXAudio2Impl;
+
+static inline IXAudio2Impl *impl_from_IXAudio2(IXAudio2 *iface)
+{
+    return CONTAINING_RECORD(iface, IXAudio2Impl, IXAudio2Impl_iface);
 }
+
+static const struct IXAudio2Vtbl XAudio2_Vtbl;

+HRESULT XAudio2_create(IUnknown *pUnkOuter, LPVOID *ppObj)
+{
+    IXAudio2Impl* object;
+
+    TRACE("(%p, %p)\n", pUnkOuter, ppObj);
+
+    if(pUnkOuter)
+        return CLASS_E_NOAGGREGATION;
+
+    object = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(IXAudio2Impl));
+    if(!object)
+        return E_OUTOFMEMORY;
+
+    object->IXAudio2Impl_iface.lpVtbl = &XAudio2_Vtbl;
+    object->ref = 1;
+
+    *ppObj = object;

+
+    return S_OK;
+}
+
+/*** IUnknown methods ***/
+static HRESULT WINAPI IXAudio2Impl_QueryInterface(IXAudio2 *iface, REFIID riid, void **ppvObject)
+{
+    IXAudio2Impl *This = impl_from_IXAudio2(iface);
+
+    TRACE("(%p)->(%s, %p)\n", This, debugstr_guid(riid), ppvObject);
+
+    if(IsEqualGUID(riid, &IID_IUnknown) ||
+       IsEqualGUID(riid, &IID_IXAudio2))
+    {
+        IXAudio2_AddRef(iface);
+        *ppvObject = iface;
+        return S_OK;
+    }
+
+    ERR("(%p)->(%s,%p), not found\n", This,debugstr_guid(riid), ppvObject);