OpenCV-free BGRA capture using Epiphan DVI2PCIe Duo

[dzhoshkun]

This is part of #9 But opening a new issue to be able to handle this sub-task separately, as #9 involves other similar-scale tasks as well. Will pick the development from the current #9 branch.

[dzhoshkun]

Line 68 of epiphan/samples/v2u_lib/src/v2u_bmp.c shows the Epiphan ARGB32 format to be packed.

[dzhoshkun]

• epiphan/samples/v2u_lib/src/v2u_bmp.c lists (see the "flip" bit!):

      /* format */                /* opt */ /* fourcc */  /* flip */
...
    { V2U_GRABFRAME_FORMAT_ARGB32 ,"argb32" ,NULL        ,V2U_TRUE  },

[dzhoshkun]

The frames are scrambled even at C++ level. Confirmed with:

#include "videosourcefactory.h"
#include "videotargetfactory.h"
#include <thread>
#include <chrono>

int main()
{
    IVideoSource *src = gg::VideoSourceFactory::get_instance().get_device(gg::Device::DVI2PCIeDuo_SDI, gg::ColourSpace::BGRA);
    gg::IVideoTarget *tgt = gg::VideoTargetFactory::get_instance().create_file_writer(gg::Codec::HEVC, "bgra.mp4", src->get_frame_rate());
    src->attach(*tgt);
    std::this_thread::sleep_for(std::chrono::duration<double, std::milli>(10000));
    src->detach(*tgt);
    gg::VideoSourceFactory::get_instance().free_device(gg::Device::DVI2PCIeDuo_SDI);
    delete tgt;
    return 0;
}