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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
**
****************************************************************************/
#include <directshoweventloop.h>
#include <QtCore/qcoreapplication.h>
#include <QtCore/qcoreevent.h>
QT_BEGIN_NAMESPACE
class DirectShowPostedEvent
{
Q_DISABLE_COPY(DirectShowPostedEvent)
public:
DirectShowPostedEvent(QObject *receiver, QEvent *event)
: receiver(receiver)
, event(event)
{
}
~DirectShowPostedEvent()
{
delete event;
}
QObject *receiver;
QEvent *event;
DirectShowPostedEvent *next = nullptr;
};
DirectShowEventLoop::DirectShowEventLoop(QObject *parent)
: QObject(parent)
, m_eventHandle(::CreateEvent(nullptr, FALSE, FALSE, nullptr))
, m_waitHandle(::CreateEvent(nullptr, FALSE, FALSE, nullptr))
{
}
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 = nullptr;
locker.unlock();
QCoreApplication::sendEvent(post->receiver, post->event);
delete post;
locker.relock();
}
}
QT_END_NAMESPACE
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