4.3 Class
CS 312 Audio Programming Winter 2020

// hw431_main.cpp
#ifndef hw431_CDRUMACHINE_H_
#include "hw431_CDrumMachine.h"
#endif

#ifndef hw423_CMIDITRACK_H
#include "hw423_CMidiTrack.h"
#endif

#ifndef HW421_CDELAYMS_H_
#include "hw421_CDelayMs.h"
#endif

#ifndef HW422_CAPPLEMIDISYNTH_H_
#include "hw422_CAppleMidiSynth.h"
#endif

#include <iostream>

using namespace CMP33;

int main()
{
  // declare the playback vector
  std::vector<CMidiPacket> vplay;

  // create the drum machine
  CDrumMachine dm;

  // stuff each row into the dm.tracks vector
  dm.make_track(kBASS_DRUM, {"1000", "1000", "1000", "1000"});
  // ... 7 more rows to go
  // figure them out from the picture of Apple's Drum Beat Sequencer picture on the web page
  std::cout << "main(): dm.make_track() 7 more rows to go\n";

  std::cout << "main(): you need to implement the for loop\n";
  for (auto n = 0; n < dm.vDrumTracks.size(); ++n)
  {
    dm.vDrumTracks[n].write_track(4); // repeat each row 4x
    // use std::copy(...) to stuff each of the eight vDrumTracks[n] into vplay
    std::cout << "main(): use std::copy(...) to stuff every vDrumTracks[n] into vplay\n";
  }
  sort(vplay.begin(), vplay.end());

  // use std::sort(...) to sort vplay
  std::cout << "main(): use std::sort(...) to sort vplay\n";

  // write vplay to std::cout
  std::cout << "main(): write vplay to std::cout\n";

  // set the CDelayMs::s_tempo, try 75
  std::cout << "main(): set the CDelayMs::s_tempo to 75\n";

  CDelayMs::s_tempo = 75;
  CAppleMidiSynth ams;
  // ams.send(vplay);
};

// hw431_CDrumTrack.cpp
#ifndef hw431_CDRUMTRACK_H_
#include "hw431_CDrumTrack.h"
#endif

CDrumTrack::CDrumTrack() : CMidiTrack(0, 0, 0, 0, 0, 0, 0)
{
  drum_note = 0;
  vbeat_pattern = {"0000", "0000", "0000", "0000"};
  vbeat_dur = {250, 250, 250, 250};
  beat_num = 0;
}

void CDrumTrack::init_note_pats(const uint8_t note, const std::vector<std::string> &pats)
{
  drum_note = note;
  vbeat_pattern = {pats};
}

void CDrumTrack::write_onebeat(std::string pat)
{
  /* 
  beat_num keeps a running count of the drum_machine ticks.
  In one trip through a drum_machine row, beat_num's will be 0, 1, 2, ... 14, 15
  In four trips through a drum_machine row, the starting beat_num of each repeat will be 0, 16, 32, 48
  The timestamp of each beat_num = beat_num * 1000
  vbeat_dur is a vector of 4 timestamps representing the duration of each beat subdivision {250,250,250,250}
  vbeat_pattern is a vector of 4 strings representing the on/off state of each beat subdivision {"1000","1000","1000","1000"}
  pat is one element of the vbeat_pattern vector representing the four subdivisions of a single beat like "1010".
  vbeat_dur.size() == vbeat_pattern.size() == 4 elemenets in each vector
  pat.size() == 4 (each element of vbeat_pattern has string length == 4)
  Every "1" in pat sends a NON message and must be matched with a n NOF 1ms before the next beat subdivision starts.
  Every "0" in pat is ignored for NON/NOF 
  The timestamp of each beat subdivision is updated by its duration for both "1" and "0".
  Increment beat_num when all four ones and zeros of the beat subdivision have been processed
 */
  std::cout << "CDrumTrack::write_onebeat(std::string pat) not implementated\n";
}

void CDrumTrack::write_beats()
{
  int subdivs = vbeat_pattern.size(); // is always be 4 for this drum machine
  for (int ix = 0; ix < subdivs; ++ix)
    write_onebeat(vbeat_pattern.at(ix));
}

void CDrumTrack::write_track()
{
  write_beats();
}

void CDrumTrack::write_track(int num_loops)
{
  for (auto ix = 0; ix < num_loops; ++ix)
    write_track();
}

cmake_minimum_required(VERSION 3.5)
set(APPNAME "drum_machine")
project(${APPNAME})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -Wall ")
# you finish

common folder
├── hw332_CMidiPacket.cpp
├── hw423_CMidiTrack.cpp
├── hw421_CDelayMs.cpp
└── hw422_CAppleMidiSynth.cpp

hw431_drumMachine folder
├── hw431_CDrumMachine.cpp
├── hw431_CDrumTrack.cpp
└── hw431_main.cpp

je$ ./drum_machine
main(): dm.make_track() 7 more rows to go
main(): you need to implement the for loop
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
CDrumTrack::write_onebeat(std::string pat) not implementated
main(): use std::copy(...) to stuff every vDrumTracks[n] into vplay
main(): use std::sort(...) to sort vplay
main(): write vplay to std::cout
main(): set the CDelayMs::s_tempo to 75
CAppleMidiSynth() success

# mp3 tempo was 75 bpm
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