ref: be960d187cbab362628859e5663035f21a54c4c7
dir: /test/ding.c/
/*
ding.c -- program to generate testpatterns for DSP 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 -0x7fff
#else
# define SAMPL long
# define MAXSAMPL 0x7fffffff
# define MINSAMPL -0x7fffffff
#endif
struct _Env {
struct _Env *next;
int r; /* rise */
int m; /* middle */
int f; /* fall */
int e; /* end */
FLOAT frq; /* frequency */
FLOAT b; /* bend (not quite implemented) */
FLOAT v; /* volume */
FLOAT d; /* decay */
FLOAT x,y; /* current x,y */
FLOAT phx,phy;/* per-sample phase multiplier cos(PI*frq),sin(PI*frq) */
};
const struct _Env EnvTemplate = {NULL,0,0,0,0,0.0,0.0,0.5,1.0,0.0,1.0,1.0,0.0};
struct _Env * Env0 = NULL; /* 1st */
struct _Env * EnvL = NULL; /* last */
struct _Env *env_new(struct _Env *L)
{
struct _Env *E;
E = (struct _Env *) malloc(sizeof(struct _Env));
if (E) {
memcpy(E, (L)? L : &EnvTemplate, sizeof(struct _Env));
}
return E;
}
static void env_init(struct _Env *E)
{
if (0<E->frq && E->frq<1) {
E->x = 1; E->y = 0;
} else {
E->x = 0; E->y = 1;
}
E->phx = cos(E->frq*M_PI);
E->phy = sin(E->frq*M_PI);
}
static void env_post(struct _Env *E, int k)
{
double x1;
x1 = E->x*E->phx - E->y*E->phy;
E->y = E->x*E->phy + E->y*E->phx;
E->x = x1;
/* update (x,y) for next tic */
if (!(k&0x0f)) { /* norm correction each 16 samples */
x1 = 1/sqrt(E->x*E->x+E->y*E->y);
E->x *= x1;
E->y *= x1;
}
}
/* rise/fall function, monotonic [0,1] -> [1-0] */
static inline double ramp(double s)
{
return 0.5*(1 + cos(M_PI * s));
}
static double env(struct _Env *Env, int k)
{
double u = 0;
//if (k >= Env->r && k < Env->e) {
if (k<Env->m) {
u = Env->v * ramp((double)(Env->m-k)/(Env->m-Env->r));
}else if (k<Env->f) {
u = Env->v;
Env->v *= Env->d;
}else{
u = Env->v * ramp((double)(k-Env->f)/(Env->e-Env->f));
}
u *= Env->y;
env_post(Env,k);
//}
return u;
}
static void Usage(void)__attribute__((noreturn));
static void Usage(void)
{
fprintf(stderr, "Usage: ./ding [options] [<in-file>] <out-file>\n");
fprintf(stderr, " Options:\n");
fprintf(stderr, " -f <freq> float, frequency = freq*nyquist_rate\n");
fprintf(stderr, " [-v <vol>] float, volume, 1.00 is max\n");
fprintf(stderr, " [-d <decay>] float, per-sample decay factor\n");
fprintf(stderr, " [-e start:attack:duration:mute] ints \n");
exit(-1);
}
static int ReadN(int fd, SAMPL *v, int n)
{
int r,m;
static SAMPL frag=0;
static int fraglen=0;
char *q;
q=(char*)v;
if (fraglen)
memcpy(q, (char*)&frag, fraglen);
m = n*sizeof(SAMPL) - fraglen;
q += fraglen;
if (fd>=0) {
do {
r = read(fd, q, m);
}while(r==-1 && errno==EINTR);
if (r==-1) {
perror("Error reading fd1"); exit(-1);
}
}else{
bzero(q,m);
r = m;
}
r += fraglen;
fraglen = r%sizeof(SAMPL);
if (fraglen)
memcpy((char*)&frag, (char*)v, fraglen);
return (r/sizeof(SAMPL));
}
#define BSIZ 0x10000
int main(int argct, char **argv)
{
int optc;
int fd1,fd2;
char *fnam1,*fnam2;
int len, st;
SAMPL *ibuff,max,min;
int poflo,moflo;
FLOAT Vol0=1;
struct _Env *E;
/* Parse the options */
E = NULL;
len = 0;
while ((optc = getopt(argct, argv, "d:e:f:v:h")) != -1) {
char *p;
switch(optc) {
case 'd':
if (!E) {
fprintf(stderr,"option -f must precede -%c\n", optc);
Usage();
}
E->d = strtod(optarg,&p);
if (p==optarg || *p) {
fprintf(stderr,"option -%c expects float value (%s)\n", optc, optarg);
Usage();
}
break;
case 'f':
E = env_new(EnvL);
if (EnvL) EnvL->next = E;
EnvL = E;
if (!Env0) Env0 = E;
E->frq = strtod(optarg,&p);
if (p==optarg || *p) {
fprintf(stderr,"option -%c expects float value (%s)\n", optc, optarg);
Usage();
}
break;
case 'e':
{
int t[5], tmin=0;
int i,ct=0;
if (!E) {
fprintf(stderr,"option -f must precede -%c\n", optc);
Usage();
}
for (p=optarg,ct=0; ct<5; p++) {
t[ct] = 0;
if (*p && *p != ':') {
t[ct] = strtol(p,&p,10);
if (t[ct]<tmin) tmin=t[ct];
}
ct++;
if (*p != ':') break;
}
if (ct==4) t[ct++] = 0;
if (*p || tmin<0 || ct!=5) {
fprintf(stderr,"option -%c not valid (%s)\n", optc, optarg);
Usage();
}
for (i=1; i<ct; i++)
t[i] += t[i-1];
E->r = t[0];
E->m = t[1];
E->f = t[2];
E->e = t[3];
if (len<t[4]) len=t[4];
break;
}
case 'v':
if (!E) {
fprintf(stderr,"option -f must precede -%c\n", optc);
Usage();
}
E->v = MAXSAMPL*strtod(optarg,&p);
if (E->frq==0.0) E->v *= sqrt(0.5);
if (p==optarg || *p) {
fprintf(stderr,"option -%c expects float value (%s)\n", optc, optarg);
Usage();
}
break;
case 'h':
default:
Usage();
}
}
//fprintf(stderr,"Vol0 %8.3f\n", Vol0);
fnam1=NULL; fd1=-1;
//fprintf(stderr,"optind=%d argct=%d\n",optind,argct);
if (optind <= argct-2) {
int ln1;
fnam1=argv[optind++];
fd1=open(fnam1,O_RDONLY);
if (fd1<0) {
fprintf(stderr,"Open: %s %s\n",fnam1,strerror(errno)); return(1);
}
ln1=lseek(fd1,0,SEEK_END)/2;
lseek(fd1,0,SEEK_SET);
if (len<ln1) len = ln1;
}
if (optind != argct-1) Usage();
fd2 = 1; /* stdout */
fnam2=argv[optind++];
if (strcmp(fnam2,"-")) {
fd2=open(fnam2,O_WRONLY|O_CREAT|O_TRUNC,0644);
if (fd2<0) {
fprintf(stderr,"Open: %s %s\n",fnam2,strerror(errno)); return(1);
}
}
//fprintf(stderr, "Files: %s %s\n",fnam1,fnam2);
for (E=Env0; (E); E=E->next) env_init(E);
ibuff=(SAMPL*)malloc(BSIZ*sizeof(SAMPL));
poflo=moflo=0;
max =MINSAMPL; min=MAXSAMPL;
for(st=0; st<len; ){
int ct;
SAMPL *ibp;
ct = len - st; if (ct>BSIZ) ct=BSIZ;
ReadN(fd1,ibuff,ct);
for (ibp=ibuff; ibp<ibuff+ct; ibp++,st++) {
double v = *ibp;
if (max<*ibp) max=*ibp;
else if (min>*ibp) min=*ibp;
v *= Vol0;
for (E=Env0; (E); E=E->next) {
if (st>=E->r && st<E->e) {
v += env(E, st);
}
}
if (v>MAXSAMPL) {
poflo++;
v=MAXSAMPL;
} else if (v<MINSAMPL) {
moflo++;
v=MINSAMPL;
}
*ibp = rint(v);
}
write(fd2,(char*)ibuff,ct*sizeof(SAMPL));
}
fprintf(stderr,"input range: [%ld,%ld] pos/neg oflos: %d/%d\n",min,max,poflo,moflo);
return 0;
}