main.cpp


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#include "ClickStream.h"
#include "MIDI.h"
#include "PCM.h"
#include "Timer.h"
#include "UI.h"
#include "config.h"

#include <chrono>
#include <cmath>
#include <cstdint>
#include <iostream>
#include <limits>
#include <exception>
#include <stdexcept>

#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#include <time.h>

#include <boost/signals2.hpp>

using namespace std::chrono_literals;
using namespace std::string_literals;

double diff_timespec(const struct timespec *time1, const struct timespec *time0) {
  return (time1->tv_sec - time0->tv_sec)
      + (time1->tv_nsec - time0->tv_nsec) / 1000000000.0;
}

int main(void)
{
  try {
    //debug_cout.activate();

    MIDI midi;
    ClickStream stream;
    PCM pcm{stream};
    UI ui;

    pcm.write();

    Timer timer_300ms(300ms, true);
    timer_300ms.start();

    // Signal-Slot Connections:
    midi.signal_click.connect([&](){stream.click();});
    timer_300ms.elapsed.connect([&](){ui.draw();});

    while (true) {
      //std::cout << "Main loop entered." << std::endl;
      fd_set read_set;
      FD_ZERO(&read_set);
      FD_SET(midi.fd(), &read_set);

      fd_set write_set;
      FD_ZERO(&write_set);
      FD_SET(pcm.fd(), &write_set);

      struct timeval timeout;
      timeout.tv_sec = 0;
      timeout.tv_usec = 300000;

      int result = select(FD_SETSIZE, &read_set, &write_set, NULL, &timeout);
      if (result < 0) {
        throw std::runtime_error("select() failed");
      } else if (result == 0) {
        throw std::runtime_error("select() timeout");
      }

      if (midi.event_ready())
      {
        //std::cout << "read..." << std::endl;
        auto event = midi.read();
        //std::cout << "process..." << std::endl;
        midi.process(event);
      }

      if (pcm.write_available()) {
        //std::cout << "DEBUG: WRITE" << std::endl;
        pcm.write();
      }

      // handle timers, TODO: make updates more efficient at scale
      timer_300ms.update();
    }
  } catch (const std::exception& ex) {
    std::cerr << "Error: " << ex.what() << std::endl;
  }
 
  return 0;
}