// chuck_note2hz.c
//
// Creates a list of note variables assigned to their frequencies.
// Makes working with ChucK ugen instruments easier.
//
// eg.
//		TubeBell tb => dac;
//		C3 => tb.freq;
//		1.0 => tb.noteOn;
// 
// Frequency values created with the following formula:
//
// 0 < n < 128:
// A = 440;
// (A/32) * (2^((n-9)/12))
//
// Build: cc -o chuck_note2hz chuck_note2hz.c -lm
//
// Usage: For the standard A5=440.0 tuning:
//            chuck_note2hz > midi2hz.ck
//        For a nonstandard tuning A5 != 440.0 HZ
//            A5=321.0 ./chuck_note2hz > midi2hz_A5_321.0.ck
//
// Author: Burton Samograd aka. kruhft .at. gmail - 2006
//
// License: Public Domain.  Do as thou wish.
//          Same with the generated code.

#define A5 440.0

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

int main() {
  int i;
  double a5;
  char *tmp = getenv("A5");

  if(tmp) a5 = strtod(tmp, 0);
  else  a5 = A5;

  char *n[] = { "C", "Db", "D", "Eb", "E", "F", "Gb", "G", "Ab", "A", "Bb", "B" };
  
  for(i=0;i<128;i++) {
	int note = i%12;
	double hz = (a5 / 32.0) * pow(2.0, (((double)i-9.0)/12.0));
	if(*(n[note]+1)) {
	  printf("%.8f => float %cs%d;\n", hz, (*n[note])-1, i/12);
	  printf("%.8f => float %s%d;\n", hz, n[note], i/12);
	} else
	  printf("%.8f => float %s%d;\n", hz, n[note], i/12);
  }
}