78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#pragma once
|
|
#include "Settings.h"
|
|
#include <cmath>
|
|
#include <cstdlib>
|
|
#include <cstring>
|
|
#include <string>
|
|
|
|
class KeyBoard {
|
|
private:
|
|
static int get_semitone_shift_internal(const char* root_note,
|
|
char* target_note) {
|
|
const char* pitch_classes[12] = {"C", "C#", "D", "D#", "E", "F",
|
|
"F#", "G", "G#", "A", "A#", "B"};
|
|
|
|
// Extract the note number and pitch class for the root note
|
|
int root_note_num = (int)root_note[strlen(root_note) - 1] - '0';
|
|
|
|
char* root_pitch_class_str =
|
|
(char*)malloc((strlen(root_note) - 1) * sizeof(char));
|
|
strncpy(root_pitch_class_str, root_note, strlen(root_note) - 1);
|
|
|
|
int root_pitch_class = -1;
|
|
|
|
for (int i = 0; i < 12; i++) {
|
|
if (strcmp(pitch_classes[i], root_pitch_class_str) == 0) {
|
|
root_pitch_class = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(root_pitch_class_str);
|
|
|
|
// Extract the note number and pitch class for the target note
|
|
int target_note_num = (int)target_note[strlen(target_note) - 1] - '0';
|
|
|
|
char* target_pitch_class_str =
|
|
(char*)malloc((strlen(target_note) - 1) * sizeof(char));
|
|
strncpy(target_pitch_class_str, target_note, strlen(target_note) - 1);
|
|
|
|
int target_pitch_class = -1;
|
|
|
|
for (int i = 0; i < 12; i++) {
|
|
if (strcmp(pitch_classes[i], target_pitch_class_str) == 0) {
|
|
target_pitch_class = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(target_pitch_class_str);
|
|
|
|
// Calculate the semitone shift using the formula
|
|
return (target_note_num - root_note_num) * 12 +
|
|
(target_pitch_class - root_pitch_class);
|
|
}
|
|
|
|
public:
|
|
KeyBoard(/* args */);
|
|
~KeyBoard();
|
|
|
|
static float GetHzBySemitone(int semitone) {
|
|
return PITCH_STANDARD * powf(powf(2.f, (1.f / 12.f)), semitone);
|
|
}
|
|
|
|
static int GetSemitoneShift(const std::string& target_note) {
|
|
char* target_note_cstr = new char[target_note.length() + 1];
|
|
strcpy(target_note_cstr, target_note.c_str());
|
|
|
|
int result = get_semitone_shift_internal("A4", target_note_cstr);
|
|
|
|
delete[] target_note_cstr;
|
|
return result;
|
|
}
|
|
};
|
|
|
|
KeyBoard::KeyBoard(/* args */) {}
|
|
|
|
KeyBoard::~KeyBoard() {}
|