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** this package.
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#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();
}
}