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#include "impl.hpp"
#include "compat/sleep.hpp"
#include "video-property-page.hpp"
namespace opencv_camera_impl {
cam::cam(int idx) : idx(idx)
{
}
cam::~cam()
{
stop();
}
void cam::stop()
{
if (cap)
{
if (cap->isOpened())
cap->release();
cap = std::nullopt;
}
mat = cv::Mat();
frame_ = { {}, false };
}
bool cam::is_open()
{
return !!cap;
}
bool cam::start(info& args)
{
stop();
cap.emplace(idx + video_capture_backend);
if (args.width > 0 && args.height > 0)
{
cap->set(cv::CAP_PROP_FRAME_WIDTH, args.width);
cap->set(cv::CAP_PROP_FRAME_HEIGHT, args.height);
}
if (args.fps > 0)
cap->set(cv::CAP_PROP_FPS, args.fps);
if (!cap->isOpened())
goto fail;
if (!get_frame_())
goto fail;
return true;
fail:
stop();
return false;
}
bool cam::get_frame_()
{
if (!is_open())
return false;
for (unsigned i = 0; i < 10; i++)
{
if (cap->read(mat))
{
frame_.data = mat.data;
frame_.width = mat.cols;
frame_.height = mat.rows;
frame_.stride = mat.step.p[0];
if (mat.step.p[0] == (unsigned)frame_.width * mat.elemSize())
frame_.stride = cv::Mat::AUTO_STEP;
frame_.channels = mat.channels();
return true;
}
portable::sleep(50);
}
return false;
}
std::tuple<const frame&, bool> cam::get_frame()
{
bool ret = get_frame_();
return { frame_, ret };
}
bool cam::show_dialog()
{
if (is_open())
return video_property_page::show_from_capture(*cap, idx);
else
return video_property_page::show(idx);
}
} // ns opencv_camera_impl
#ifdef _MSC_VER
// workaround bug in cmake. newest MSVC doesn't create dot.lib with no exported symbols
extern "C" __declspec(dllexport) int _empty(void) { return 0; }
#endif
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