The quickest recording of a range of events

The quickest recording of a range of events

Hello Prophesee Team,
I want to write some amounts of events (200ms, several pipeline slices) before a dynamically calculated point in time. I am always saving last 5 pointers of event buffers to deque, and use it to write events when I need it.
WriteCSV() works, but I want to do that quicker, so I tried to write in the .RAW file, and have problems with the WriteRAW().
The .raw file is created, but it is not loaded in the Metavision studio,
metavision_file_to_dat.exe has many NonMonotonicTimeHigh and InvalidVectBase errors.

and the metavision_evt2_raw_file_decoder.exe and metavision_evt3_raw_file_decoder.exe both create the output file with garbage values.

for the writing I have used code in the openeb/.../i_events_stream.cpp

  1. ofs.write(reinterpret_cast<char*>(buffer->data()), size * sizeof(Metavision::I_EventsStream::RawData));

Do you see any problems in this code:

  1. EventsWriter::EventsWriter(Metavision::Camera& camera)
  2. {
  3.     header = camera.get_device().get_facility<Metavision::I_HW_Identification>()->get_header();
  4.     header.add_date();
  5. }

  7. bool EventsWriter::AddSlice(EventBufferPtr buffer)
  8. {
  9.     buffers_deque.push_back(buffer);

  11.     if (buffers_deque.size() > buffers_amount)
  12.         buffers_deque.pop_front();

  14.     return true;
  15. }

  17. bool EventsWriter::WriteCSV()
  18. {
  19.     if (!buffers_deque.empty())
  20.     {
  21.         auto start = buffers_deque.front()->front().t;
  22.         auto end = buffers_deque.back()->back().t;
  23.         std::ostringstream ss;

  25.         for (auto& buffer : buffers_deque)
  26.             for (auto& evt : *buffer)
  27.                 ss << evt.t << "," << evt.x << "," << evt.y << "," << evt.p << "\n";

  29.         std::stringstream filename;
  30.         filename << start << "-" << end << ".csv";
  31.         std::ofstream ofs(filename.str());
  32.         ofs << ss.str();
  33.     }
  34.     return true;
  35. }

  37. bool EventsWriter::WriteRAW()
  38. {
  39.     if (!buffers_deque.empty())
  40.     {
  41.         auto start = buffers_deque.front()->front().t;
  42.         auto end = buffers_deque.back()->back().t;

  44.         std::stringstream filename;
  45.         filename << start << "-" << end << ".raw";
  46.         std::ofstream ofs(filename.str());
  47.         ofs << header;

  49.         for (auto& buffer : buffers_deque)
  50.         {
  51.             auto size = buffer->size();
  52.             ofs.write(reinterpret_cast<char*>(buffer->data()), size * sizeof(Metavision::I_EventsStream::RawData));
  53.         }
  54.         ofs.close();
  55.         ofs.clear();
  56.     }
  57.     return true;
  58. }



    We are currently experiencing issues with our server. Some links may be temporarily unavailable. We apologize for the inconvenience and appreciate your patience as we work to resolve the problem as quickly as possible.

    As a Prophesee customer, join the community conversation. 
    Request your free access today.

      Information

      In this Community Forum, you can discuss products, technology and applications. Only registred users can post but everyone can read. To ask a private question, enter a support ticket in My Area https://support.prophesee.ai/portal/en/newticket