76 lines
2 KiB
C++
76 lines
2 KiB
C++
#include <stdio.h>
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#include <math.h>
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#include "../audio.h"
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static constexpr int maxTone = (1L<<23) - 1;
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int limit (double tone) {
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int k = (int) round (tone);
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if (k > maxTone) k = 0;
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return k;
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}
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int normalize (double val, double scale) {
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return (int) round (val * scale);
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}
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int main (void) {
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double base, dint;
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int i,j;
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base = 8.1757989156; // C5 v Hz (http://www.tonalsoft.com/pub/news/pitch-bend.aspx)
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base *= (double)(1UL << 24) / double (AudioSampleRate);
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dint = pow(2.0, 1.0 / 12.0);
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FILE* out = fopen ("miditone.c","w");
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// Tabulka inkrementů pro midi tóny
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fprintf (out, "const unsigned int midiTones[] = {\n");
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for (i=0,j=0; i<127; i++) {
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fprintf (out, "%8d, ", limit (base));
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if (++j >= 12) {
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j = 0;
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fprintf (out, "\n");
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}
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base *= dint;
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}
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fprintf (out, "%8d };\n\n", limit (base));
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// Vzorky pro jednu periodu tónu včetně barvy
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double samples [256], max = 0.0, val;
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base = M_PI / 128.0;
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for (i=0; i<256; i++) {
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val = 0.0;
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val += 1.0 * sin (1.0 * base * (double) i);
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// Je dobré přidat nějaké harmonické, jinak je tón chudý
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val += 0.3 * sin (2.0 * base * (double) i);
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// 7. harmonická je nepříjemná, zkuste si to.
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// val += 0.5 * sin (7.0 * base * (double) i);
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if (val > +max) max = +val;
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if (val < -max) max = -val;
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samples [i] = val;
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}
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max = (double)(0x1FFF) / max; // normála do 14. bitů
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// mormalizace a výpis
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fprintf (out, "const short onePeriod[] = {\n");
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for (i=0,j=0; i<255; i++) {
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fprintf (out, "%6d, ", normalize (samples[i], max));
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if (++j >= 8) {
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j = 0;
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fprintf (out, "\n");
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}
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base *= dint;
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}
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fprintf (out, "%6d };\n\n", normalize (samples[i], max));
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unsigned Attack = maxAmplt;
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fprintf (out, "const unsigned attackTable[] = {\n");
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for (i=0,j=0; i<127; i++) {
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fprintf (out, "0x%08X, ", Attack);
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if (++j >= 8) {
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j = 0;
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fprintf (out, "\n");
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}
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Attack -= Attack / 20;
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}
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fprintf (out, "0x%08X };\n\n", Attack);
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fclose (out);
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}
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