MicroMDAEPiano/utility/xfade_generator.c

#include "mdaEPianoData.h"
#include <stdio.h>
#include <math.h>
#include <stdint.h>

struct KGRP  //keygroup
{
  int32_t  root;  //MIDI root note
  int32_t  high;  //highest note
  int32_t  pos;
  int32_t  end;
  int32_t  loop;
};

void main(void)
{
  struct KGRP kgrp[34];
  int16_t *waves = (int16_t*)epianoData;

  //Waveform data and keymapping
  kgrp[ 0].root = 36;  kgrp[ 0].high = 39; //C1
  kgrp[ 3].root = 43;  kgrp[ 3].high = 45; //G1
  kgrp[ 6].root = 48;  kgrp[ 6].high = 51; //C2
  kgrp[ 9].root = 55;  kgrp[ 9].high = 57; //G2
  kgrp[12].root = 60;  kgrp[12].high = 63; //C3
  kgrp[15].root = 67;  kgrp[15].high = 69; //G3
  kgrp[18].root = 72;  kgrp[18].high = 75; //C4
  kgrp[21].root = 79;  kgrp[21].high = 81; //G4
  kgrp[24].root = 84;  kgrp[24].high = 87; //C5
  kgrp[27].root = 91;  kgrp[27].high = 93; //G5
  kgrp[30].root = 96;  kgrp[30].high = 999; //C6

  kgrp[0].pos = 0;        kgrp[0].end = 8476;     kgrp[0].loop = 4400;
  kgrp[1].pos = 8477;     kgrp[1].end = 16248;    kgrp[1].loop = 4903;
  kgrp[2].pos = 16249;    kgrp[2].end = 34565;    kgrp[2].loop = 6398;
  kgrp[3].pos = 34566;    kgrp[3].end = 41384;    kgrp[3].loop = 3938;
  kgrp[4].pos = 41385;    kgrp[4].end = 45760;    kgrp[4].loop = 1633; //was 1636;
  kgrp[5].pos = 45761;    kgrp[5].end = 65211;    kgrp[5].loop = 5245;
  kgrp[6].pos = 65212;    kgrp[6].end = 72897;    kgrp[6].loop = 2937;
  kgrp[7].pos = 72898;    kgrp[7].end = 78626;    kgrp[7].loop = 2203; //was 2204;
  kgrp[8].pos = 78627;    kgrp[8].end = 100387;   kgrp[8].loop = 6368;
  kgrp[9].pos = 100388;   kgrp[9].end = 116297;   kgrp[9].loop = 10452;
  kgrp[10].pos = 116298;  kgrp[10].end = 127661;  kgrp[10].loop = 5217; //was 5220;
  kgrp[11].pos = 127662;  kgrp[11].end = 144113;  kgrp[11].loop = 3099;
  kgrp[12].pos = 144114;  kgrp[12].end = 152863;  kgrp[12].loop = 4284;
  kgrp[13].pos = 152864;  kgrp[13].end = 173107;  kgrp[13].loop = 3916;
  kgrp[14].pos = 173108;  kgrp[14].end = 192734;  kgrp[14].loop = 2937;
  kgrp[15].pos = 192735;  kgrp[15].end = 204598;  kgrp[15].loop = 4732;
  kgrp[16].pos = 204599;  kgrp[16].end = 218995;  kgrp[16].loop = 4733;
  kgrp[17].pos = 218996;  kgrp[17].end = 233801;  kgrp[17].loop = 2285;
  kgrp[18].pos = 233802;  kgrp[18].end = 248011;  kgrp[18].loop = 4098;
  kgrp[19].pos = 248012;  kgrp[19].end = 265287;  kgrp[19].loop = 4099;
  kgrp[20].pos = 265288;  kgrp[20].end = 282255;  kgrp[20].loop = 3609;
  kgrp[21].pos = 282256;  kgrp[21].end = 293776;  kgrp[21].loop = 2446;
  kgrp[22].pos = 293777;  kgrp[22].end = 312566;  kgrp[22].loop = 6278;
  kgrp[23].pos = 312567;  kgrp[23].end = 330200;  kgrp[23].loop = 2283;
  kgrp[24].pos = 330201;  kgrp[24].end = 348889;  kgrp[24].loop = 2689;
  kgrp[25].pos = 348890;  kgrp[25].end = 365675;  kgrp[25].loop = 4370;
  kgrp[26].pos = 365676;  kgrp[26].end = 383661;  kgrp[26].loop = 5225;
  kgrp[27].pos = 383662;  kgrp[27].end = 393372;  kgrp[27].loop = 2811;
  kgrp[28].pos = 383662;  kgrp[28].end = 393372;  kgrp[28].loop = 2811; //ghost
  kgrp[29].pos = 393373;  kgrp[29].end = 406045;  kgrp[29].loop = 4522;
  kgrp[30].pos = 406046;  kgrp[30].end = 414486;  kgrp[30].loop = 2306;
  kgrp[31].pos = 406046;  kgrp[31].end = 414486;  kgrp[31].loop = 2306; //ghost
  kgrp[32].pos = 414487;  kgrp[32].end = 422408;  kgrp[32].loop = 2169;

  //extra xfade looping...
  for (int32_t k = 0; k < 28; k++)
  {
    int32_t p0 = kgrp[k].end;
    int32_t p1 = kgrp[k].end - kgrp[k].loop;
    float xf = 1.0f;
    float dxf = -0.02f;

    while (xf > 0.0f)
    {
      waves[p0] = (int16_t)((1.0f - xf) * (float)waves[p0] + xf * (float)waves[p1]);

      p0--;
      p1--;
      xf += dxf;
    }
  }

  // output
  printf("#include <Arduino.h>\n\n");
  printf("const int16_t epianoDataXfade[] PROGMEM = {\n");
  for(uint32_t z=0; z<(844836/sizeof(int16_t)); z=z+20)
  {
	for(uint32_t i=0;i<20;i++)
	{
		if(z+i>=(uint32_t)(844836/sizeof(int16_t)))
			break; 
		printf("%d,",waves[z+i]);
		if(i>=19)
			printf("\n");
	}
  }
  printf("\n};\n");
}