1 files changed, 148 insertions, 0 deletions
diff --git a/src/plugins/directshow/helpers/directshoweventloop.cpp b/src/plugins/directshow/helpers/directshoweventloop.cpp
new file mode 100644
index 000000000..87f969e42
--- /dev/null
+++ b/src/plugins/directshow/helpers/directshoweventloop.cpp
@@ -0,0 +1,148 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/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 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <directshoweventloop.h>
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qcoreevent.h>
+
+class DirectShowPostedEvent
+{
+public:
+    DirectShowPostedEvent(QObject *receiver, QEvent *event)
+        : receiver(receiver)
+        , event(event)
+        , next(0)
+    {
+    }
+
+    ~DirectShowPostedEvent()
+    {
+        delete event;
+    }
+
+    QObject *receiver;
+    QEvent *event;
+    DirectShowPostedEvent *next;
+};
+
+DirectShowEventLoop::DirectShowEventLoop(QObject *parent)
+    : QObject(parent)
+    , m_postsHead(0)
+    , m_postsTail(0)
+    , m_eventHandle(::CreateEvent(0, 0, 0, 0))
+    , m_waitHandle(::CreateEvent(0, 0, 0, 0))
+{
+}
+
+DirectShowEventLoop::~DirectShowEventLoop()
+{
+    ::CloseHandle(m_eventHandle);
+    ::CloseHandle(m_waitHandle);
+
+    for (DirectShowPostedEvent *post = m_postsHead; post; post = m_postsHead) {
+        m_postsHead = m_postsHead->next;
+
+        delete post;
+    }
+}
+
+void DirectShowEventLoop::wait(QMutex *mutex)
+{
+    ::ResetEvent(m_waitHandle);
+
+    mutex->unlock();
+
+    HANDLE handles[] = { m_eventHandle, m_waitHandle };
+    while (::WaitForMultipleObjects(2, handles, false, INFINITE) == WAIT_OBJECT_0)
+        processEvents();
+
+    mutex->lock();
+}
+
+void DirectShowEventLoop::wake()
+{
+    ::SetEvent(m_waitHandle);
+}
+
+void DirectShowEventLoop::postEvent(QObject *receiver, QEvent *event)
+{
+    QMutexLocker locker(&m_mutex);
+
+    DirectShowPostedEvent *post = new DirectShowPostedEvent(receiver, event);
+
+    if (m_postsTail)
+        m_postsTail->next = post;
+    else
+        m_postsHead = post;
+
+    m_postsTail = post;
+
+    QCoreApplication::postEvent(this, new QEvent(QEvent::User));
+    ::SetEvent(m_eventHandle);
+}
+
+void DirectShowEventLoop::customEvent(QEvent *event)
+{
+    if (event->type() == QEvent::User) {
+        processEvents();
+    } else {
+        QObject::customEvent(event);
+    }
+}
+
+void DirectShowEventLoop::processEvents()
+{
+    QMutexLocker locker(&m_mutex);
+
+    ::ResetEvent(m_eventHandle);
+
+    while(m_postsHead) {
+        DirectShowPostedEvent *post = m_postsHead;
+        m_postsHead = m_postsHead->next;
+
+        if (!m_postsHead)
+            m_postsTail = 0;
+
+        locker.unlock();
+        QCoreApplication::sendEvent(post->receiver, post->event);
+        delete post;
+        locker.relock();
+    }
+}