ref: 2024869a595118d686682b38386c594c717ea5bd
dir: /test/model.c/
/*
model.c -- program to help test DSP filter and rate-conversion code.
Copyright (C) 1999 Stanley J. Brooks <stabro@megsinet.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
// for open,read,write:
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#define FLOAT double
#ifndef LSAMPL
# define SAMPL short
# define MAXSAMPL 0x7fff
# define MINSAMPL -0x8000
#else
# define SAMPL long
# define MAXSAMPL 0x7fffff
# define MINSAMPL -0x800000
#endif
static struct _Env {
int r; /* rise */
int c; /* center */
int f; /* fall */
double v; /* volume */
double d; /* decay */
} Env = {0,0,0,0.5,1.0};
static void Usage(void)__attribute__((noreturn));
static void Usage(void)
{
fprintf(stderr,"Usage: ./model rate0,rate1 [-l len] [-f freq] <in-file>\n"); exit(-1);
}
static int ReadN(int fd, SAMPL *v, int n)
{
int r;
do {
r = read(fd, (char*)(v), n*sizeof(SAMPL));
}while(r==-1 && errno==EINTR);
if (r==-1 || r%sizeof(SAMPL)) {
perror("Error reading input"); exit(-1);
}
return r/sizeof(SAMPL);
}
#define BSIZ 400000/*0x10000*/
static double bestfit(double sx, double sy,
double h11, double h12, double h22,
double *cx, double *cy)
{
double a,su,uu,cu,w2;
a=0; *cy=0;
if (h22>1e-20*h11) {
a = h12/h22; /* u[] = x[] - a*y[] is orthogonal to y[] */
*cy = sy/h22; /* *cy*y[] is projection of s[] onto y[] */
}
/* <s,x-ay> = sx -a*sy */
su = sx - a*sy; /* su is iprod of s[] and u[] */
/* <u,u> = <x-ay,x-ay> = h11 - 2a*h11 + a*a*h22 */
uu = h11 - 2*a*h12 + a*a*h22;
cu = 0;
if (uu>1e-20*h11)
cu = su/uu; /* s[] = *cy * y[] + cu * u[] is orthogonal decomposition */
w2 = *cy * *cy * h22;
w2 += cu * cu * uu;
*cx = cu;
*cy -= a*cu;
return w2;
}
static double eCenter(const SAMPL *ibuff, int len)
{
double v0,v1,v2;
int n;
v0 = v1 = v2 = 0;
for (n=0; n<len; n++) {
double w = ibuff[n];
w = w*w;
v0 += w;
v1 += n*w;
v2 += (n*n)*w;
}
v1 /= v0;
v2 /= v0;
v2 -= v1*v1;
fprintf(stderr,"eCenter %.2f, STD %.2f\n",v1,sqrt(v2));
return v1;
}
static void
bigcalc(double Factor, double Freq1, const SAMPL *ibuff, int len)
{
double c,del;
double x,y;
double thx,thy;
double Len1;
int k1,n;
long double h11,h12,h22;
long double sx,sy,ss;
double cn,cx,cy;
double s2=0, v2=0;
const SAMPL *ip;
inline void a_init(double frq)
{
x = 1;
y = 0;
thx = cos(frq*M_PI);
thy = sin(frq*M_PI);
}
inline double a(double k, double L)
{
double a, l, u;
l = L/2.0;
u = k/l - 1; /* in (-1,+1) */
a = 0.5*(1 + cos(M_PI * u));
return a;
}
inline void a_post(int k)
{
double x1;
x1 = x*thx - y*thy;
y = x*thy + y*thx;
x = x1;
/* update (x,y) for next tic */
if ((k&0x0f)==0x0f) { /* norm correction each 16 samples */
x1 = 1/sqrt(x*x+y*y);
x *= x1;
y *= x1;
}
}
c = eCenter(ibuff,len);
Len1 = Env.c*Factor*0.6; /* 60% of original const-amplitude area */
c += Env.c*Factor*0.15; /* beginning after 30% */
{
double a;
int b;
a = c-Len1/2;
b = ceil(a-0.001);
ip = ibuff + b;
del = b-a;
}
fprintf(stderr,"del %.3f\n", del);
k1 = Len1-del;
a_init(Freq1);
h11 = h12 = h22 = 0;
sx = sy = ss = 0;
for(n=0; n<=k1; n++) {
double f,s;
double u,v;
s = ip[n]; /* sigval at n */
f = 1; //a(n+del,Len1);
u = f*x; v = f*y;
sx += s*u;
sy += s*v;
ss += s*s;
h11 += u*u;
h12 += u*v;
h22 += v*v;
a_post(n);
}
//fprintf(stderr,"h12 %.10f\n", (double)h12/(sqrt(h11)*sqrt(h22)));
v2 = ss/(k1+1);
s2 = bestfit(sx,sy,h11,h12,h22,&cx,&cy)/(k1+1);
cn = sqrt(cx*cx+cy*cy);
fprintf(stderr,"amp %.1f, cx %.10f, cy %.10f\n", cn, cx/cn, cy/cn);
fprintf(stderr,"[%.1f,%.1f] s2max %.2f, v2max %.2f, rmserr %.2f\n",
c/Factor, c, sqrt(s2), sqrt(v2), (s2<=v2)? sqrt(v2-s2):-sqrt(s2-v2));
}
int main(int argct, char **argv)
{
int optc;
int fd1;
int len;
SAMPL *ibuff;
int rate0, rate1;
double Freq0=0, Freq1; /* of nyquist */
double Factor;
char *fnam1;
/* Parse the options */
while ((optc = getopt(argct, argv, "d:e:f:h")) != -1) {
char *p;
switch(optc) {
case 'd':
Env.d = strtod(optarg,&p);
if (p==optarg || *p) {
fprintf(stderr,"option -%c expects float value (%s)\n", optc, optarg);
Usage();
}
break;
case 'f':
Freq0 = strtod(optarg,&p);
if (p==optarg || *p) {
fprintf(stderr,"option -%c expects float value (%s)\n", optc, optarg);
Usage();
}
break;
case 'e':
p = optarg;
Env.c = strtol(p,&p,10);
if (*p++ == ':') {
Env.r = Env.f = Env.c;
Env.c = strtol(p,&p,10);
}
if (*p++ == ':') {
Env.f = strtol(p,&p,10);
}
if (*p || Env.c<=0 || Env.r<0 || Env.f<0) {
fprintf(stderr,"option -%c not valid (%s)\n", optc, optarg);
Usage();
}
break;
case 'h':
default:
Usage();
}
}
//fprintf(stderr,"optind=%d argct=%d\n",optind,argct);
if (optind != argct-2) Usage();
{
char *p0, *p;
p0 = argv[optind];
rate0 = rate1 = strtol(p0,&p,10);
if (*p) {
if (*p != ':') {
fprintf(stderr,"Invalid rate parameter (%s)\n", p0);
Usage();
}
p0 = p+1;
rate1 = strtol(p0,&p,10);
if (*p) {
fprintf(stderr,"Invalid 2nd rate parameter (%s)\n", p0);
Usage();
}
}
if (rate0<=0 || rate1<=0) {
fprintf(stderr,"Invalid rate parameter (%s)\n", argv[optind]);
Usage();
}
optind++;
}
Factor = (double)rate1 / (double)rate0;
Freq1 = Freq0/Factor;
//if (optind != argct-1) Usage();
fnam1=NULL; fd1=-1;
fnam1=argv[optind++];
fd1=open(fnam1,O_RDONLY);
if (fd1<0) {
fprintf(stderr,"Open: %s %s\n",fnam1,strerror(errno)); return(1);
}
//fprintf(stderr, "Files: %s %s\n",fnam1,fnam2);
ibuff=(SAMPL*)malloc(BSIZ*sizeof(SAMPL));
{
int n,r;
for (n=0; n<BSIZ; n+=r) {
r = ReadN(fd1,ibuff+n,BSIZ-n);
if (r==0) break;
}
len = n;
}
fprintf(stderr,"Read %d input samples\n",len);
bigcalc(Factor, Freq1, ibuff, len);
return 0;
}