MIDI music player
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b953ae2f1d
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@ -43,35 +43,6 @@
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#include "limits.h"
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#include "iir.h"
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#include "dsp.h"
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#include "log.h"
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struct dsp_iir make_iir(int cofs, int order)
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{
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struct dsp_iir new;
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new.dcof = calloc(sizeof(float), cofs * order);
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new.ccof = calloc(sizeof(float), cofs * order);
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new.dx = calloc(sizeof(float), cofs * order);
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new.dy = calloc(sizeof(float), cofs * order);
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new.order = order;
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new.n = cofs;
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return new;
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}
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struct dsp_iir biquad_iir()
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{
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struct dsp_iir new = make_iir(3, 1);
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return new;
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}
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struct dsp_iir p2_iir_order(int order)
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{
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struct dsp_iir new = make_iir(3, order);
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new.order = order;
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return new;
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}
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/**********************************************************************
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binomial_mult - multiplies a series of binomials together and returns
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@ -670,105 +641,25 @@ float *fir_bpf(int n, double fcf1, double fcf2)
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struct dsp_iir sp_lp(double fcf)
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{
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struct dsp_iir new = make_iir(2, 1);
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double x = exp(-2*M_PI*fcf);
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new.ccof[0] = 1 - x;
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new.ccof[1] = 0.f;
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new.dcof[0] = 0.f;
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new.dcof[1] = x;
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return new;
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}
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struct dsp_iir sp_hp(double fcf)
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{
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struct dsp_iir new = make_iir(2, 1);
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double x = exp(-2*M_PI*fcf);
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new.ccof[0] = (1 + x)/2;
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new.ccof[1] = -new.ccof[0];
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new.dcof[0] = 0.f;
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new.dcof[1] = x;
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return new;
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}
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/* http://www.dspguide.com/ch19/3.htm */
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struct dsp_iir sp_bp(double fcf, double bw)
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{
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double R = 1 - 3*bw;
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double K = (1 - 2*R*cos(2*M_PI*fcf)+pow(R, 2)) / (2 - 2*cos(2*M_PI*fcf));
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struct dsp_iir new = make_iir(3, 1);
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new.ccof[0] = 1-K;
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new.ccof[1] = 2*(K-R)*cos(2*M_PI*fcf);
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new.ccof[2] = pow(R, 2) - K;
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new.dcof[0] = 0.f;
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new.dcof[1] = 2*R*cos(2*M_PI*fcf);
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new.dcof[2] = -1 * pow(R, 2);
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return new;
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}
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struct dsp_iir sp_notch(double fcf, double bw)
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{
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double R = 1 - 3*bw;
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double K = (1 - 2*R*cos(2*M_PI*fcf)+pow(R, 2)) / (2 - 2*cos(2*M_PI*fcf));
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struct dsp_iir new = make_iir(3, 1);
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new.ccof[0] = K;
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new.ccof[1] = -2*K*cos(2*M_PI*fcf);
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new.ccof[2] = K;
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new.dcof[0] = 0.f;
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new.dcof[1] = 2*R*cos(2*M_PI*fcf);
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new.dcof[2] = -1 * pow(R, 2);
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return new;
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}
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double chevy_pct_to_e(double pct)
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{
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if (pct > 0.292 || pct < 0) {
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YughWarn("Gave a percentage out of range. Should be between 0.0 and 0.292 to get a proper value. Gave %f.", pct);
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pct = pct > 0.292 ? 0.292 : 0.f;
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}
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double e = pow(1/(1-pct), 2) - 1;
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return e;
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}
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/* Four stage single pole low pass, similar to gauss */
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/* http://www.dspguide.com/ch19/2.htm */
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struct dsp_iir sp_lp_gauss(double fcf)
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{
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struct dsp_iir new = make_iir(5, 1);
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double x = exp(-14.445*fcf);
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new.ccof[0] = pow((1 - x), 4);
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new.dcof[0] = 0.f;
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new.dcof[1] = 4*x;
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new.dcof[2] = -6 * pow(x, 2);
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new.dcof[3] = 4 * pow(x, 3);
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new.dcof[4] = -1 * pow(x,4);
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return new;
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}
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/* Biquad filters */
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struct dsp_iir biquad_iir()
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{
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struct dsp_iir new;
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new.dcof = malloc(sizeof(float) * 3);
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new.ccof = malloc(sizeof(float) * 3);
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new.dx = malloc(sizeof(float) * 3);
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new.dy = malloc(sizeof(float) * 3);
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new.n = 3;
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return new;
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}
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void biquad_iir_fill(struct dsp_iir bq, double *a, double *b)
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{
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bq.ccof[0] = (b[0] / a[0]);
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@ -951,7 +842,7 @@ void p2_ccalc(double fcf, double p, double g, double *a, double *b)
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double w0 = tan(M_PI * fcf);
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double k[2];
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k[0] = p * w0;
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k[1] = g * pow(w0, 2);
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k[1] = g * pow2(w0);
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a[0] = k[1] / (1 + k[0] + k[1]);
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a[1] = 2 * a[0];
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@ -1021,7 +912,19 @@ struct dsp_iir p2_beshp(double fcf)
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return new;
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}
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struct dsp_iir p2_iir_order(int order)
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{
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struct dsp_iir new;
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new.n = 3;
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new.order = order;
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new.ccof = calloc(sizeof(float), 3 * order);
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new.dcof = calloc(sizeof(float), 3 * order);
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new.dx = calloc(sizeof(float), 3 * order);
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new.dy = calloc(sizeof(float), 3 * order);
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return new;
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}
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short p2_filter(struct dsp_iir iir, short val)
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{
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@ -1059,8 +962,8 @@ struct dsp_iir che_lp(int order, double fcf, double e)
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double a = tan(M_PI * fcf);
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double a2 = pow(a, 2);
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double u = log((1.f + sqrt(1.f + pow(e, 2)))/e);
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double a2 = pow2(a);
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double u = log((1.f + sqrt(1.f + pow2(e)))/e);
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double su = sinh(u/new.order);
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double cu = cosh(u/new.order);
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double b, c, s;
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@ -1070,7 +973,7 @@ struct dsp_iir che_lp(int order, double fcf, double e)
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{
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b = sin(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * su;
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c = cos(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * cu;
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c = pow(b, 2) + pow(c, 2);
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c = pow2(b) + pow2(c);
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s = a2*c + 2.f*a*b + 1.f;
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double A = a2/(4.f);
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@ -1091,8 +994,8 @@ struct dsp_iir che_hp(int order, double fcf, double e)
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struct dsp_iir new = che_lp(order, fcf, e);
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double a = tan(M_PI * fcf);
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double a2 = pow(a, 2);
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double u = log((1.f + sqrt(1.f + pow(e, 2)))/e);
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double a2 = pow2(a);
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double u = log((1.f + sqrt(1.f + pow2(e)))/e);
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double su = sinh(u/new.order);
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double cu = cosh(u/new.order);
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double b, c, s;
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@ -1102,7 +1005,7 @@ struct dsp_iir che_hp(int order, double fcf, double e)
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{
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b = sin(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * su;
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c = cos(M_PI * (2.f*i + 1.f)/(2.f*new.order)) * cu;
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c = pow(b, 2) + pow(c, 2);
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c = pow2(b) + pow2(c);
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s = a2*c + 2.f*a*b + 1.f;
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double A = 1.f/(4.f);
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@ -1118,23 +1021,29 @@ struct dsp_iir che_hp(int order, double fcf, double e)
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struct dsp_iir che_bp(int order, double s, double fcf1, double fcf2, double e)
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{
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struct dsp_iir new = make_iir(5, order);
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if (order %4 != 0) {
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YughWarn("Tried to make a filter with wrong order. Given order was %d, but order should be 4, 8, 12, ...", order);
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}
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double a = cos(M_PI*(fcf1+fcf2)/s) / cos(M_PI*(fcf2-fcf1)/s);
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double a2 = pow(a, 2);
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double ep = 2.f/e;
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int n = order / 4;
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struct dsp_iir new = p2_iir_order(order);
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double a = cos(M_PI*(fcf1+fcf2)/2) / cos(M_PI*(fcf2-fcf1)/s);
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double a2 = pow2(a);
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double b = tan(M_PI*(fcf2-fcf1)/s);
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double b2 = pow(b, 2);
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double u = log((1.f+sqrt(1.f+pow(e, 2)))/e);
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double b2 = pow2(b);
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double u = log((1.f+sqrt(1.f+pow2(e)))/e);
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double su = sinh(2.f*u/new.order);
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double cu = cosh(2.f*u/new.order);
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double A = b2/(4.f);
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double r, c;
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double ep = 2.f/e;
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for (int i = 0; i < new.order; ++i) {
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r = sin(M_PI*(2.f*i+1.f)/new.order)*su;
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c = cos(M_PI*(2.f*i+1.f)/new.order)*su;
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c = pow(r, 2) + pow(c, 2);
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c = pow2(r) + pow2(c);
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s = b2*c + 2.f*b*r + 1.f;
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new.ccof[0*i] = ep * 1.f/A;
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@ -1151,32 +1060,37 @@ struct dsp_iir che_bp(int order, double s, double fcf1, double fcf2, double e)
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return new;
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}
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struct dsp_iir che_notch(int order, double s, double fcf1, double fcf2, double e)
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struct dsp_iir che_notch(int order, double fcf1, double fcf2, double e)
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{
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struct dsp_iir new = make_iir(5, order);
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if (order %4 != 0) {
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YughWarn("Tried to make a filter with wrong order. Given order was %d, but order should be 4, 8, 12, ...", order);
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}
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double a = cos(M_PI*(fcf1+fcf2)/s) / cos(M_PI*(fcf2-fcf1)/s);
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double a2 = pow(a, 2);
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int n = order / 4;
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struct dsp_iir new = p2_iir_order(order);
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double a = cos(M_PI*(fcf1+fcf2)/2) / cos(M_PI*(fcf2-fcf1)/s);
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double a2 = pow2(a);
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double b = tan(M_PI*(fcf2-fcf1)/s);
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double b2 = pow(b, 2);
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double u = log((1.f+sqrt(1.f+pow(e, 2)))/e);
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double su = sinh(2.f*u/new.n);
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double cu = cosh(2.f*u/new.n);
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double b2 = pow2(b);
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double u = log((1.f+sqrt(1.f+pow2(e)))/e);
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double su = sinh(2.f*u/n);
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double cu = cosh(2.f*u/n);
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double A = b2/(4.f*s);
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double r, c;
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double ep = 2.f/e;
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double r, c, s;
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for (int i = 0; i < new.order; ++i) {
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r = sin(M_PI*(2.f*i+1.f)/new.order)*su;
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c = cos(M_PI*(2.f*i+1.f)/new.order)*su;
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c = pow(r, 2) + pow(c, 2);
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c = cos(M_PI*(2.f*i+1.f)/ew.order)*su;
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c = pow2(r) + pow2(c);
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s = b2*c + 2.f*b*r + 1.f;
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new.ccof[0*i] = ep * 1.f/A;
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new.ccof[1*i] = ep * -2.f/A;
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new.ccof[2*i] = ep * 1.f/A;
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new.dcof[0*i] = 0.f;
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new.ddof[0*i] = 0.f;
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new.dcof[1*i] = ep * 4.f*a*(c+b*r)/s;
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new.dcof[2*i] = ep * 2.f*(b2-2.f*a2*c-c)/s;
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new.dcof[3*i] = ep * 4.f*a*(c-b*r)/s;
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67
source/engine/music.c
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67
source/engine/music.c
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@ -0,0 +1,67 @@
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#include "music.h"
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#include "dsp.h"
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#include "tsf.h"
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#include "tml.h"
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#include "mix.h"
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#include "sound.h"
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#define TSF_BLOCK 64
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struct dsp_filter cursong;
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struct dsp_midi_song gsong;
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void dsp_midi_fillbuf(struct dsp_midi_song *song, void *out, int n)
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{
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short *o = (short*)out;
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tml_message *midi = song->midi;
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for (int i = TSF_BLOCK; n; n -= i, o += n*CHANNELS) {
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if (i > n) i = n;
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for (song->time += i * (1000.f / SAMPLERATE); midi && song->time >= midi->time; midi = midi->next) {
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switch (midi->type)
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{
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case TML_PROGRAM_CHANGE:
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tsf_channel_set_presetnumber(song->sf, midi->channel, midi->program, (midi->channel == 9));
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break;
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case TML_NOTE_ON:
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tsf_channel_note_on(song->sf, midi->channel, midi->key, midi->velocity / 127.f);
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break;
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case TML_NOTE_OFF:
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tsf_channel_note_off(song->sf, midi->channel, midi->key);
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break;
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case TML_PITCH_BEND:
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tsf_channel_set_pitchwheel(song->sf, midi->channel, midi->pitch_bend);
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break;
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case TML_CONTROL_CHANGE:
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tsf_channel_midi_control(song->sf, midi->channel, midi->control, midi->control_value);
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break;
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}
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}
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tsf_render_short(song->sf, o, i, 0);
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}
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song->midi = midi;
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}
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void play_song(const char *midi, const char *sf)
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{
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gsong.midi = tml_load_filename("sounds/one-winged-angel.mid");
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gsong.sf = tsf_load_filename("sounds/mario.sf2");
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gsong.time = 0.f;
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tsf_set_output(gsong.sf, TSF_STEREO_INTERLEAVED, SAMPLERATE, 0.f);
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// Preset on 10th MIDI channel to use percussion sound bank if possible
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tsf_channel_set_bank_preset(gsong.sf, 9, 128, 0);
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cursong.data = &gsong;
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cursong.filter = dsp_midi_fillbuf;
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first_free_bus(cursong);
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}
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17
source/engine/music.h
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17
source/engine/music.h
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@ -0,0 +1,17 @@
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#ifndef MUSIC_H
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#define MUSIC_H
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#include "tsf.h"
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#include "tml.h"
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struct dsp_midi_song {
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float bpm;
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double time;
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tsf *sf;
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tml_message *midi;
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};
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void play_song(const char *midi, const char *sf);
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void dsp_midi_fillbuf(struct dsp_midi_song *song, void *out, int n);
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#endif
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@ -6,6 +6,7 @@
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#include "math.h"
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#include "limits.h"
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#include "time.h"
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#include "music.h"
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#include "SDL2/SDL.h"
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@ -226,8 +227,7 @@ void sound_init()
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tsf *tsf_load_filename("sounds/ff7.sf2");
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tml_message *tml_load_filename("sounds/one_winged_angel.mid");
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play_song("", "");
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}
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void audio_open(const char *device)
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