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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();

    }

}