149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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/* https://sourceforge.net/p/ed2midi/code/ */
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/* From a spreadsheet from ed2midi */
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/* Octave 1 2 3 4 5
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A 255 128 64 32 16
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A#/B- 240 120 60 30 15
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B 228 114 57 28 14
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C 216 108 54 27 13
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C#/D- 204 102 51 25 12
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D 192 96 48 24 12
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D#/E- 180 90 45 22 11
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E 172 86 43 21 10
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F 160 80 40 20 10
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F#/G- 152 76 38 19 9
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G 144 72 36 18 9
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G#/A- 136 68 34 17 8
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*/
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int note_to_ed(char note, int flat, int sharp, int octave) {
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int value=0,result=0;
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int octave_divider[5]={1,2,4,8,16};
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switch(note) {
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case 'A':
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if (flat==1) value=272;
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else if (sharp==1) value=240;
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else value=256;
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break;
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case 'B':
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if (flat==1) value=240;
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else if (sharp==1) value=216;
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else value=228;
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break;
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case 'C':
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if (flat==1) value=228;
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else if (sharp==1) value=204;
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else value=216;
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break;
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case 'D':
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if (flat==1) value=204;
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else if (sharp==1) value=180;
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else value=192;
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break;
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case 'E':
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if (flat==1) value=180;
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else if (sharp==1) value=160;
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else value=172;
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break;
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case 'F':
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if (flat==1) value=172;
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else if (sharp==1) value=152;
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else value=160;
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break;
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case 'G':
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if (flat==1) value=152;
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else if (sharp==1) value=136;
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else value=144;
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break;
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default:
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fprintf(stderr,"Unknown note %c\n",note);
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}
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if ((octave<1) || (octave>5)) {
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fprintf(stderr,"Invalid octave %d\n",octave);
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return -1;
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}
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result=value/octave_divider[octave-1];
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if (result>255) result=255;
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return result;
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}
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static struct note_mapping_type {
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int freq[12];
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} note_mapping[5]={
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/* A A# B C C# D D# E F F# G G# */
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{{ 255,240,228,216,204,192,180,172,160,152,144,136}}, // 1
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{{ 128,120,114,108,102, 96, 90, 86, 80, 76, 72, 68}}, // 2
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{{ 64, 60, 57, 54, 51, 48, 45, 43, 40, 38, 36, 34}}, // 3
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{{ 32, 30, 28, 27, 25, 24, 22, 21, 20, 19, 18, 17}}, // 4
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{{ 16, 15, 14, 13, 12, 12, 11, 10, 10, 9, 9, 8}}, // 5
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};
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static char notes[12]= {'A','A','B','C','C','D','D','E','F','F','G','G'};
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static char sharps[12]={' ','#',' ',' ','#',' ','#',' ',' ','#',' ','#'};
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char *ed_to_note(int freq, char *out) {
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int i,j;
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int note=0,octave=0,notefound=0;;
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// printf("Freq=%d\n",freq);
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for(i=0;i<5;i++) {
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if ((freq<=note_mapping[i].freq[0]) &&
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(freq>=note_mapping[i].freq[11])) {
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octave=i+1;
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break;
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}
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}
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for(j=0;j<12;j++) {
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if (freq==note_mapping[i].freq[j]) {
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note=j;
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notefound=1;
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break;
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}
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}
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if ((!notefound) && (freq>28)) {
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for(j=0;j<12;j++) {
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if ((freq+1)==note_mapping[i].freq[j]) {
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note=j;
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notefound=1;
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break;
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}
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}
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}
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if ((!notefound) && (freq>28)) {
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for(j=0;j<12;j++) {
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if ((freq-1)==note_mapping[i].freq[j]) {
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note=j;
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notefound=1;
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break;
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}
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}
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}
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if (!notefound) {
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sprintf(out,"%3d",freq);
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}
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else {
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out[0]=notes[note];
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out[1]=sharps[note];
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out[2]=octave+'0';
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}
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out[3]=0;
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return out;
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}
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