37 lines
1.0 KiB
Python
37 lines
1.0 KiB
Python
#!/usr/bin/env python3
|
|
|
|
start_pitch = 36 # C2
|
|
end_pitch = 84 # C6
|
|
|
|
pitch_A0 = 21
|
|
pitch_C1 = 24
|
|
pitch_A4 = 69
|
|
freq_A4 = 440
|
|
|
|
def pitch_to_freq(pitch):
|
|
dist_A4 = pitch - pitch_A4
|
|
factor = pow(2, abs(dist_A4) / 12)
|
|
|
|
if dist_A4 > 0:
|
|
return freq_A4 * factor
|
|
else:
|
|
return freq_A4 / factor
|
|
|
|
def pitch_to_period_micros(pitch):
|
|
return 1 / pitch_to_freq(pitch) * 1000 * 1000
|
|
|
|
pitch_names = ["A", "A#", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#"]
|
|
def pitch_to_name(pitch):
|
|
return pitch_names[(pitch - pitch_A0) % 12] + str(int((pitch - pitch_C1) / 12) + 1)
|
|
|
|
print("#pragma once")
|
|
print("")
|
|
print("constexpr unsigned int midi_pitch_offset = " + str(start_pitch) + ";")
|
|
print("constexpr unsigned int midi_pitch_max = " + str(end_pitch) + ";")
|
|
print("constexpr unsigned long midi_pitch_period[" + str(end_pitch - start_pitch) + "] = {")
|
|
|
|
for i in range(start_pitch, end_pitch):
|
|
period = int(pitch_to_period_micros(i))
|
|
print(" " + str(period) + ",\t// " + pitch_to_name(i))
|
|
|
|
print("};") |