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Diffstat (limited to 'src/plugins/directshow/common/directshoweventloop.cpp')
-rw-r--r-- | src/plugins/directshow/common/directshoweventloop.cpp | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/plugins/directshow/common/directshoweventloop.cpp b/src/plugins/directshow/common/directshoweventloop.cpp new file mode 100644 index 000000000..ef85c0429 --- /dev/null +++ b/src/plugins/directshow/common/directshoweventloop.cpp @@ -0,0 +1,152 @@ +/**************************************************************************** +** +** 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> + +QT_BEGIN_NAMESPACE + +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(); + } +} + +QT_END_NAMESPACE |