1 files changed, 70 insertions, 0 deletions
diff --git a/src/multimedia/windows/qwindowsmediafoundation.cpp b/src/multimedia/windows/qwindowsmediafoundation.cpp
new file mode 100644
index 000000000..7094c9551
--- /dev/null
+++ b/src/multimedia/windows/qwindowsmediafoundation.cpp
@@ -0,0 +1,70 @@
+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qwindowsmediafoundation_p.h"
+#include <QtCore/qdebug.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace {
+
+Q_GLOBAL_STATIC(QWindowsMediaFoundation, s_wmf);
+
+template <typename T>
+bool setProcAddress(QSystemLibrary &lib, T &f, const char name[])
+{
+    f = reinterpret_cast<T>(lib.resolve(name));
+    return static_cast<bool>(f);
+}
+
+} // namespace
+
+QWindowsMediaFoundation *QWindowsMediaFoundation::instance()
+{
+    if (s_wmf->valid())
+        return s_wmf;
+
+    return nullptr;
+}
+
+QWindowsMediaFoundation::QWindowsMediaFoundation()
+{
+    if (!m_mfplat.load(false))
+        return;
+
+    m_valid = setProcAddress(m_mfplat, mfStartup, "MFStartup")
+            && setProcAddress(m_mfplat, mfShutdown, "MFShutdown")
+            && setProcAddress(m_mfplat, mfCreateMediaType, "MFCreateMediaType")
+            && setProcAddress(m_mfplat, mfCreateMemoryBuffer, "MFCreateMemoryBuffer")
+            && setProcAddress(m_mfplat, mfCreateSample, "MFCreateSample");
+
+    Q_ASSERT(m_valid); // If it is not valid at this point, we have a programming bug
+}
+
+QWindowsMediaFoundation::~QWindowsMediaFoundation() = default;
+
+bool QWindowsMediaFoundation::valid() const
+{
+    return m_valid;
+}
+
+QMFRuntimeInit::QMFRuntimeInit(QWindowsMediaFoundation *wmf)
+    : m_wmf{ wmf }, m_initResult{ wmf ? m_wmf->mfStartup(MF_VERSION, MFSTARTUP_FULL) : E_FAIL }
+{
+    if (m_initResult != S_OK)
+        qErrnoWarning(m_initResult, "Failed to initialize Windows Media Foundation");
+}
+
+QMFRuntimeInit::~QMFRuntimeInit()
+{
+    // According to documentation MFShutdown should be called
+    // also when MFStartup failed. This is wrong.
+    if (FAILED(m_initResult))
+        return;
+
+    const HRESULT hr = m_wmf->mfShutdown();
+    if (hr != S_OK)
+        qErrnoWarning(hr, "Failed to shut down Windows Media Foundation");
+}
+
+QT_END_NAMESPACE