WMF: enabled HW-accelerated video decoding for the QML video item.

It also applies to QGraphicsVideoItem when used on a GL viewport.
We now have a new video sink that is based on Microsoft's EVR sink, we just
replace the default Presenter with our own. Frames are rendered into D3D
surfaces using DXVA, then copied into a shared D3D/EGL surface and finally
bound to a GL texture to be used by the video surface.
The shared D3D/EGL surface is a feature provided by ANGLE and therefore Qt
must be compiled with ANGLE for this new video sink to be compiled and
used.

Change-Id: I0b7b9968eed5488f9ef1a2dcca5213bd0af232ab
Reviewed-by: Yoann Lopes <yoann.lopes@digia.com>

src/plugins/wmf/mfglobal.h

@@ -0,0 +1,157 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MFGLOBAL_H
+#define MFGLOBAL_H
+
+#include <mfapi.h>
+#include <mfidl.h>
+#include <Mferror.h>
+
+
+template<class T>
+class AsyncCallback : public IMFAsyncCallback
+{
+public:
+    typedef HRESULT (T::*InvokeFn)(IMFAsyncResult *asyncResult);
+
+    AsyncCallback(T *parent, InvokeFn fn) : m_parent(parent), m_invokeFn(fn)
+    {
+    }
+
+    // IUnknown
+    STDMETHODIMP QueryInterface(REFIID iid, void** ppv)
+    {
+        if (!ppv)
+            return E_POINTER;
+
+        if (iid == __uuidof(IUnknown)) {
+            *ppv = static_cast<IUnknown*>(static_cast<IMFAsyncCallback*>(this));
+        } else if (iid == __uuidof(IMFAsyncCallback)) {
+            *ppv = static_cast<IMFAsyncCallback*>(this);
+        } else {
+            *ppv = NULL;
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+
+    STDMETHODIMP_(ULONG) AddRef() {
+        // Delegate to parent class.
+        return m_parent->AddRef();
+    }
+    STDMETHODIMP_(ULONG) Release() {
+        // Delegate to parent class.
+        return m_parent->Release();
+    }
+
+
+    // IMFAsyncCallback methods
+    STDMETHODIMP GetParameters(DWORD*, DWORD*)
+    {
+        // Implementation of this method is optional.
+        return E_NOTIMPL;
+    }
+
+    STDMETHODIMP Invoke(IMFAsyncResult* asyncResult)
+    {
+        return (m_parent->*m_invokeFn)(asyncResult);
+    }
+
+    T *m_parent;
+    InvokeFn m_invokeFn;
+};
+
+template <class T> void qt_wmf_safeRelease(T **ppT)
+{
+    if (*ppT) {
+        (*ppT)->Release();
+        *ppT = NULL;
+    }
+}
+
+template <class T>
+void qt_wmf_copyComPointer(T* &dest, T *src)
+{
+    if (dest)
+        dest->Release();
+    dest = src;
+    if (dest)
+        dest->AddRef();
+}
+
+HRESULT qt_wmf_getFourCC(IMFMediaType *type, DWORD *fourCC);
+MFRatio qt_wmf_getPixelAspectRatio(IMFMediaType *type);
+bool qt_wmf_areMediaTypesEqual(IMFMediaType *type1, IMFMediaType *type2);
+HRESULT qt_wmf_validateVideoArea(const MFVideoArea& area, UINT32 width, UINT32 height);
+bool qt_wmf_isSampleTimePassed(IMFClock *clock, IMFSample *sample);
+
+inline float qt_wmf_MFOffsetToFloat(const MFOffset& offset)
+{
+    return offset.value + (float(offset.fract) / 65536);
+}
+
+inline MFOffset qt_wmf_makeMFOffset(float v)
+{
+    MFOffset offset;
+    offset.value = short(v);
+    offset.fract = WORD(65536 * (v-offset.value));
+    return offset;
+}
+
+inline MFVideoArea qt_wmf_makeMFArea(float x, float y, DWORD width, DWORD height)
+{
+    MFVideoArea area;
+    area.OffsetX = qt_wmf_makeMFOffset(x);
+    area.OffsetY = qt_wmf_makeMFOffset(y);
+    area.Area.cx = width;
+    area.Area.cy = height;
+    return area;
+}
+
+inline HRESULT qt_wmf_getFrameRate(IMFMediaType *pType, MFRatio *pRatio)
+{
+    return MFGetAttributeRatio(pType, MF_MT_FRAME_RATE, (UINT32*)&pRatio->Numerator, (UINT32*)&pRatio->Denominator);
+}
+
+
+#endif // MFGLOBAL_H