ref: a540717a81d810ec03ea64d2ab7ea035f334c036
dir: /src/misc.c/
/*
* July 5, 1991
* Copyright 1991 Lance Norskog And Sundry Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Lance Norskog And Sundry Contributors are not responsible for
* the consequences of using this software.
*/
/*
* Sound Tools miscellaneous stuff.
*/
#include "st.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
const char *st_sizes_str[] = {
"NONSENSE!",
"bytes",
"shorts",
"NONSENSE",
"longs",
"32-bit floats",
"64-bit floats",
"IEEE floats"
};
const char *st_encodings_str[] = {
"NONSENSE!",
"unsigned",
"signed (2's complement)",
"u-law",
"a-law",
"adpcm",
"ima_adpcm",
"gsm",
};
static const char readerr[] = "Premature EOF while reading sample file.";
static const char writerr[] = "Error writing sample file. You are probably out of disk space.";
/* Utilities */
/* Read in a buffer of data of length len and each element is size bytes.
* Returns number of elements read, not bytes read.
*/
LONG st_read(ft, buf, size, len)
ft_t ft;
void *buf;
int size;
LONG len;
{
return fread(buf, size, len, ft->fp);
}
/* Write a buffer of data of length len and each element is size bytes.
* Returns number of elements writen, not bytes writen.
*/
LONG st_write(ft, buf, size, len)
ft_t ft;
void *buf;
int size;
LONG len;
{
return fwrite(buf, size, len, ft->fp);
}
/* Read and write known datatypes in "machine format". Swap if indicated.
* They all return ST_EOF on error and ST_SUCCESS on success.
*/
/* Read n-char string (and possibly null-terminating).
* Stop reading and null-terminate string if either a 0 or \n is reached.
*/
int
st_reads(ft, c, len)
ft_t ft;
char *c;
int len;
{
char *sc;
char in;
sc = c;
do
{
if (fread(&in, 1, 1, ft->fp) != 1)
{
*sc = 0;
return (ST_EOF);
}
if (in == 0 || in == '\n')
{
break;
}
*sc = in;
sc++;
} while (sc - c < len);
*sc = 0;
return(ST_SUCCESS);
}
/* Write null-terminated string (without \0). */
int
st_writes(ft, c)
ft_t ft;
char *c;
{
if (fwrite(c, 1, strlen(c), ft->fp) != strlen(c))
{
st_fail(writerr);
return(ST_EOF);
}
return(ST_SUCCESS);
}
/* Read byte. */
int
st_readb(ft, uc)
ft_t ft;
unsigned char *uc;
{
if (fread(uc, 1, 1, ft->fp) != 1)
{
return(ST_EOF);
}
return ST_SUCCESS;
}
/* Write byte. */
int
st_writeb(ft, uc)
ft_t ft;
unsigned char uc;
{
if (fwrite(&uc, 1, 1, ft->fp) != 1)
{
st_fail(writerr);
return(ST_EOF);
}
return(ST_SUCCESS);
}
/* Read word. */
int
st_readw(ft, us)
ft_t ft;
unsigned short *us;
{
if (fread(us, 2, 1, ft->fp) != 1)
{
return (ST_EOF);
}
if (ft->swap)
*us = st_swapw(*us);
return ST_SUCCESS;
}
/* Write word. */
int
st_writew(ft, us)
ft_t ft;
unsigned short us;
{
if (ft->swap)
us = st_swapw(us);
if (fwrite(&us, 2, 1, ft->fp) != 1)
{
st_fail(writerr);
return (ST_EOF);
}
return(ST_SUCCESS);
}
/* Read double word. */
int
st_readdw(ft, ul)
ft_t ft;
ULONG *ul;
{
if (fread(ul, 4, 1, ft->fp) != 1)
{
return (ST_EOF);
}
if (ft->swap)
*ul = st_swapl(*ul);
return ST_SUCCESS;
}
/* Write double word. */
int
st_writedw(ft, ul)
ft_t ft;
ULONG ul;
{
if (ft->swap)
ul = st_swapl(ul);
if (fwrite(&ul, 4, 1, ft->fp) != 1)
{
st_fail(writerr);
return (ST_EOF);
}
return(ST_SUCCESS);
}
/* Read float. */
int
st_readf(ft, f)
ft_t ft;
float *f;
{
if (fread(f, sizeof(float), 1, ft->fp) != 1)
{
return(ST_EOF);
}
if (ft->swap)
*f = st_swapf(*f);
return ST_SUCCESS;
}
/* Write float. */
int
st_writef(ft, f)
ft_t ft;
float f;
{
float t = f;
if (ft->swap)
t = st_swapf(t);
if (fwrite(&t, sizeof(float), 1, ft->fp) != 1)
{
st_fail(writerr);
return (ST_EOF);
}
return (ST_SUCCESS);
}
/* Read double. */
int
st_readdf(ft, d)
ft_t ft;
double *d;
{
if (fread(d, sizeof(double), 1, ft->fp) != 1)
{
return(ST_EOF);
}
if (ft->swap)
*d = st_swapd(*d);
return ST_SUCCESS;
}
/* Write double. */
int
st_writedf(ft, d)
ft_t ft;
double d;
{
if (ft->swap)
d = st_swapd(d);
if (fwrite(&d, sizeof(double), 1, ft->fp) != 1)
{
st_fail(writerr);
return (ST_EOF);
}
return (ST_SUCCESS);
}
/* generic swap routine. Swap l and place in to f (datatype length = n) */
static void
st_swapb(l, f, n)
char *l, *f;
int n;
{ register int i;
for (i= 0; i< n; i++)
f[i]= l[n-i-1];
}
/* Byte swappers, use libc optimized macro's if possible */
#ifndef HAVE_BYTESWAP_H
unsigned short
st_swapw(us)
unsigned short us;
{
return ((us >> 8) | (us << 8)) & 0xffff;
}
ULONG
st_swapl(ul)
ULONG ul;
{
return (ul >> 24) | ((ul >> 8) & 0xff00) | ((ul << 8) & 0xff0000L) | (ul << 24);
}
/* return swapped 32-bit float */
float
st_swapf(float f)
{
union {
ULONG l;
float f;
} u;
u.f= f;
u.l= (u.l>>24) | ((u.l>>8)&0xff00) | ((u.l<<8)&0xff0000L) | (u.l<<24);
return u.f;
}
#endif
double
st_swapd(df)
double df;
{
double sdf;
st_swapb(&df, &sdf, sizeof(double));
return (sdf);
}
/* dummy routines for do-nothing functions */
void st_nothing(void) {}
LONG st_nothing_success(void) {return(0);}
/* dummy drain routine for effects */
void st_null_drain(effp, obuf, osamp)
eff_t effp;
LONG *obuf;
LONG *osamp;
{
*osamp = 0;
}
/* here for linear interp. might be useful for other things */
LONG st_gcd(a, b)
LONG a, b;
{
if (b == 0)
return a;
else
return st_gcd(b, a % b);
}
LONG st_lcm(a, b)
LONG a, b;
{
/* parenthesize this way to avoid LONG overflow in the product term */
return a * (b / st_gcd(a, b));
}
#ifndef HAVE_RAND
/*
* Portable random generator as defined by ANSI C Standard.
* Don't ask me why not all C libraries include it.
*/
static ULONG rand_seed = 1;
int rand() {
rand_seed = (rand_seed * 1103515245L) + 12345L;
return ((unsigned int)(rand_seed/65536L) % 32768L);
}
void srand(seed)
unsigned int seed;
{
rand_seed = seed;
}
#endif
/* Util to set initial seed so that we are a little less non-random */
void st_initrand(void) {
time_t t;
time(&t);
srand(t);
}
LONG st_clip24(l)
LONG l;
{
if (l >= ((LONG)1 << 23))
return ((LONG)1 << 23) - 1;
else if (l <= -((LONG)1 << 23))
return -((LONG)1 << 23) + 1;
else
return l;
}
/* This was very painful. We need a sine library. */
void st_sine(buf, len, max, depth)
int *buf;
LONG len;
int max;
int depth;
{
long i;
int offset;
double val;
offset = max - depth;
for (i = 0; i < len; i++) {
val = sin((double)i/(double)len * 2.0 * M_PI);
buf[i] = (int) ((1.0 + val) * depth / 2.0);
}
}
void st_triangle(buf, len, max, depth)
int *buf;
LONG len;
int max;
int depth;
{
LONG i;
int offset;
double val;
offset = max - 2 * depth;
for (i = 0; i < len / 2; i++) {
val = i * 2.0 / len;
buf[i] = offset + (int) (val * 2.0 * (double)depth);
}
for (i = len / 2; i < len ; i++) {
val = (len - i) * 2.0 / len;
buf[i] = offset + (int) (val * 2.0 * (double)depth);
}
}
const char *
st_version()
{
static char versionstr[20];
sprintf(versionstr, "Version %d.%d.%d",
(ST_LIB_VERSION_CODE & 0xff0000) >> 16,
(ST_LIB_VERSION_CODE & 0x00ff00) >> 8,
(ST_LIB_VERSION_CODE & 0x0000ff));
return(versionstr);
}
#ifndef HAVE_STRERROR
/* strerror function */
char *strerror(errcode)
int errcode;
{
static char nomesg[30];
extern int sys_nerr;
extern char *sys_errlist[];
if (errcode < sys_nerr)
return (sys_errlist[errcode]);
else
{
sprintf (nomesg, "Undocumented error %d", errcode);
return (nomesg);
}
}
#endif