void DirectShowSampleScheduler::setFlushing(bool flushing)
{
QMutexLocker locker(&m_mutex);
const bool isFlushing = m_state & Flushing;
if (isFlushing != flushing) {
if (flushing) {
m_state |= Flushing;
for (DirectShowTimedSample *sample = m_head; sample; sample = sample->remove()) {
sample->unschedule(m_clock);
m_semaphore.release(1);
}
m_head = 0;
m_tail = 0;
::SetEvent(m_flushEvent);
} else {
m_state &= ~Flushing;
if (m_state != Stopped)
::ResetEvent(m_flushEvent);
}
}
}
HRESULT DirectShowSampleScheduler::Receive(IMediaSample *pSample)
{
if (!pSample)
return E_POINTER;
m_semaphore.acquire(1);
QMutexLocker locker(&m_mutex);
if (m_state & Flushing) {
m_semaphore.release(1);
return S_FALSE;
} else if (m_state == Stopped) {
m_semaphore.release();
return VFW_E_WRONG_STATE;
} else {
DirectShowTimedSample *timedSample = new DirectShowTimedSample(pSample);
if (m_tail)
m_tail->setNextSample(timedSample);
else
m_head = timedSample;
m_tail = timedSample;
if (m_state == Running) {
if (!timedSample->schedule(m_clock, m_startTime, m_timeoutEvent)) {
// Timing information is unavailable, so schedule frames immediately.
QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
} else {
locker.unlock();
HANDLE handles[] = { m_flushEvent, m_timeoutEvent };
DWORD result = ::WaitForMultipleObjects(2, handles, FALSE, INFINITE);
locker.relock();
if (result == WAIT_OBJECT_0 + 1)
QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
}
} else if (m_tail == m_head) {
// If this is the first frame make it available.
QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
if (m_state == Paused) {
::ResetEvent(m_timeoutEvent);
locker.unlock();
HANDLE handles[] = { m_flushEvent, m_timeoutEvent };
::WaitForMultipleObjects(2, handles, FALSE, INFINITE);
locker.relock();
}
}
return S_OK;
}
}
void DirectShowSampleScheduler::pause()
{
QMutexLocker locker(&m_mutex);
m_state = (m_state & Flushing) | Paused;
for (DirectShowTimedSample *sample = m_head; sample; sample = sample->nextSample())
sample->unschedule(m_clock);
}
void DirectShowSampleScheduler::run(REFERENCE_TIME startTime)
{
QMutexLocker locker(&m_mutex);
m_state = (m_state & Flushing) | Running;
m_startTime = startTime;
for (DirectShowTimedSample *sample = m_head; sample; sample = sample->nextSample()) {
sample->schedule(m_clock, m_startTime, m_timeoutEvent);
}
}
void DirectShowSampleScheduler::stop()
{
QMutexLocker locker(&m_mutex);
m_state = m_state & Flushing;
for (DirectShowTimedSample *sample = m_head; sample; sample = sample->remove()) {
sample->unschedule(m_clock);
m_semaphore.release(1);
}
m_head = 0;
m_tail = 0;
}
HRESULT DirectShowSampleScheduler::Receive(IMediaSample *pSample)
{
if (!pSample)
return E_POINTER;
m_semaphore.acquire(1);
QMutexLocker locker(&m_mutex);
if (m_state & Flushing) {
m_semaphore.release(1);
return S_FALSE;
} else if (m_state == Stopped) {
m_semaphore.release();
return VFW_E_WRONG_STATE;
} else {
DirectShowTimedSample *timedSample = new DirectShowTimedSample(pSample);
if (m_tail)
m_tail->setNextSample(timedSample);
else
m_head = timedSample;
m_tail = timedSample;
if (m_state == Running) {
if (!timedSample->schedule(m_clock, m_startTime, m_timeoutEvent)) {
// Timing information is unavailable, so schedule frames immediately.
QMetaObject::invokeMethod(this, "timerActivated", Qt::QueuedConnection);
}
} else if (m_tail == m_head) {
// If this is the first frame make is available.
QMetaObject::invokeMethod(this, "timerActivated", Qt::QueuedConnection);
}
return S_OK;
}
}
