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Added functionality to disable the embedded v4l2 grabber when a higher priority source is active

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Former-commit-id: 4c0403584093a1fac29d16b502773c3ed11a13a9
This commit is contained in:
johan
2014-03-22 15:35:25 +01:00
parent c3ba03e0ee
commit 6fafb23a3f
4 changed files with 49 additions and 10 deletions
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22
libsrc/grabber/v4l2/V4L2Grabber.cpp
View File

@@ -72,10 +72,7 @@ V4L2Grabber::V4L2Grabber(const std::string & device,
V4L2Grabber::~V4L2Grabber()
{
// stop if the grabber was not stopped
if (_streamNotifier != nullptr && _streamNotifier->isEnabled()) {
stop();
}
stop();
uninit_device();
close_device();
}
@@ -103,14 +100,22 @@ void V4L2Grabber::setSignalThreshold(double redSignalThreshold, double greenSign
void V4L2Grabber::start()
{
_streamNotifier->setEnabled(true);
start_capturing();
if (_streamNotifier != nullptr && !_streamNotifier->isEnabled())
{
_streamNotifier->setEnabled(true);
start_capturing();
std::cout << "V4L2 grabber started" << std::endl;
}
}
void V4L2Grabber::stop()
{
stop_capturing();
_streamNotifier->setEnabled(false);
if (_streamNotifier != nullptr && _streamNotifier->isEnabled())
{
stop_capturing();
_streamNotifier->setEnabled(false);
std::cout << "V4L2 grabber stopped" << std::endl;
}
}
void V4L2Grabber::open_device()
@@ -142,6 +147,7 @@ void V4L2Grabber::open_device()
// create the notifier for when a new frame is available
_streamNotifier = new QSocketNotifier(_fileDescriptor, QSocketNotifier::Read);
_streamNotifier->setEnabled(false);
connect(_streamNotifier, SIGNAL(activated(int)), this, SLOT(read_frame()));
}

27
libsrc/grabber/v4l2/V4L2Wrapper.cpp
View File

@@ -28,7 +28,8 @@ V4L2Wrapper::V4L2Wrapper(const std::string &device,
pixelDecimation),
_processor(ImageProcessorFactory::getInstance().newImageProcessor()),
_hyperion(hyperion),
_ledColors(hyperion->getLedCount(), ColorRgb{0,0,0})
_ledColors(hyperion->getLedCount(), ColorRgb{0,0,0}),
_timer()
{
// set the signal detection threshold of the grabber
_grabber.setSignalThreshold(
@@ -52,6 +53,13 @@ V4L2Wrapper::V4L2Wrapper(const std::string &device,
this, SIGNAL(emitColors(int,std::vector<ColorRgb>,int)),
_hyperion, SLOT(setColors(int,std::vector<ColorRgb>,int)),
Qt::QueuedConnection);
// setup the higher prio source checker
// this will disable the v4l2 grabber when a source with hisher priority is active
_timer.setInterval(500);
_timer.setSingleShot(false);
QObject::connect(&_timer, SIGNAL(timeout()), this, SLOT(checkSources()));
_timer.start();
}
V4L2Wrapper::~V4L2Wrapper()
@@ -88,3 +96,20 @@ void V4L2Wrapper::newFrame(const Image<ColorRgb> &image)
emit emitColors(_priority, _ledColors, _timeout_ms);
}
void V4L2Wrapper::checkSources()
{
QList<int> activePriorities = _hyperion->getActivePriorities();
for (int x : activePriorities)
{
if (x < _priority)
{
// found a higher priority source: grabber should be disabled
_grabber.stop();
return;
}
}
// no higher priority source was found: grabber should be enabled
_grabber.start();
}