ref: 8c54fac1999ec9ebb429cf0e0f3c40de2b9127d6
dir: /src/stat.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 statistics "effect" file.
*
* Build various statistics on file and print them.
* No output.
*/
#include <math.h>
#include "st.h"
#define MAXLONG 0x7fffffffL
/* Private data for STAT effect */
typedef struct statstuff {
double min, max;
double asum;
double sum1, sum2; /* amplitudes */
double dmin, dmax;
double dsum1, dsum2; /* deltas */
double scale; /* scale-factor */
double last; /* previous sample */
ULONG read; /* samples processed */
int volume;
int srms;
ULONG bin[4];
} *stat_t;
/*
* Process options
*/
void stat_getopts(effp, n, argv)
eff_t effp;
int n;
char **argv;
{
stat_t stat = (stat_t) effp->priv;
stat->scale = MAXLONG;
stat->volume = 0;
stat->srms = 0;
while (n>0)
{
if (!(strcmp(argv[0], "-v"))) {
stat->volume = 1;
goto did1;
}
if (!(strcmp(argv[0], "-s"))) {
double scale;
if (n <= 1)
fail("-s option: invalid argument");
if (!strcmp(argv[1],"rms")) {
stat->srms=1;
goto did2;
}
if (!sscanf(argv[1], "%lf", &scale))
fail("-s option: invalid argument");
stat->scale = scale;
goto did2;
}
if (!(strcmp(argv[0], "-rms"))) {
double scale;
if (n <= 1 || !sscanf(argv[1], "%lf", &scale))
fail("-s option expects float argument");
stat->srms = 1;
goto did2;
}
if (!(strcmp(argv[0], "debug"))) {
stat->volume = 2;
goto did1;
}
else
fail("Summary effect: unknown option");
did2: --n; ++argv;
did1: --n; ++argv;
}
}
/*
* Prepare processing.
*/
void stat_start(effp)
eff_t effp;
{
stat_t stat = (stat_t) effp->priv;
int i;
stat->min = stat->max = 0;
stat->asum = 0;
stat->sum1 = stat->sum2 = 0;
stat->dmin = stat->dmax = 0;
stat->dsum1 = stat->dsum2 = 0;
stat->last = 0;
stat->read = 0;
for (i = 0; i < 4; i++)
stat->bin[i] = 0;
}
/*
* Processed signed long samples from ibuf to obuf.
* Return number of samples processed.
*/
void stat_flow(effp, ibuf, obuf, isamp, osamp)
eff_t effp;
LONG *ibuf, *obuf;
int *isamp, *osamp;
{
stat_t stat = (stat_t) effp->priv;
int len, done;
short count;
count = 0;
len = ((*isamp > *osamp) ? *osamp : *isamp);
if (len==0) return;
if (stat->read == 0) /* 1st sample */
stat->min = stat->max = stat->last = (*ibuf)/stat->scale;
for(done = 0; done < len; done++) {
long lsamp;
double samp, delta;
/* work in scaled levels for both sample and delta */
lsamp = *ibuf++;
samp = (double)lsamp/stat->scale;
stat->bin[RIGHT(lsamp,30)+2]++;
*obuf++ = lsamp;
if (stat->volume == 2)
{
fprintf(stderr,"%f ",samp);
if (count++ == 5)
{
fprintf(stderr,"\n");
count = 0;
}
}
/* update min/max */
if (stat->min > samp)
stat->min = samp;
else if (stat->max < samp)
stat->max = samp;
stat->sum1 += samp;
stat->sum2 += samp*samp;
stat->asum += fabs(samp);
delta = fabs(samp - stat->last);
if (delta < stat->dmin)
stat->dmin = delta;
else if (delta > stat->dmax)
stat->dmax = delta;
stat->dsum1 += delta;
stat->dsum2 += delta*delta;
stat->last = samp;
}
stat->read += len;
/* Process all samples */
}
/*
* Do anything required when you stop reading samples.
* Don't close input file!
*/
void
stat_stop(effp)
eff_t effp;
{
stat_t stat = (stat_t) effp->priv;
double amp, scale, rms = 0, freq;
double x, ct;
ct = stat->read;
if (stat->srms) { /* adjust results to units of rms */
double f;
rms = sqrt(stat->sum2/ct);
f = 1.0/rms;
stat->max *= f;
stat->min *= f;
stat->asum *= f;
stat->sum1 *= f;
stat->sum2 *= f*f;
stat->dmax *= f;
stat->dmin *= f;
stat->dsum1 *= f;
stat->dsum2 *= f*f;
stat->scale *= rms;
}
scale = stat->scale;
amp = -stat->min;
if (amp < stat->max)
amp = stat->max;
/* Just print the volume adjustment */
if (stat->volume == 1 && amp > 0) {
fprintf(stderr, "%.3f\n", MAXLONG/(amp*scale));
return;
}
if (stat->volume == 2) {
fprintf(stderr, "\n");
}
/* print out the info */
fprintf(stderr, "Samples read: %12lu\n", stat->read);
fprintf(stderr, "Length (seconds): %12.6f\n", (double)stat->read/effp->ininfo.rate);
if (stat->srms)
fprintf(stderr, "Scaled by rms: %12.6f\n", rms);
else
fprintf(stderr, "Scaled by: %12.1f\n", scale);
fprintf(stderr, "Maximum amplitude: %12.6f\n", stat->max);
fprintf(stderr, "Minimum amplitude: %12.6f\n", stat->min);
fprintf(stderr, "Mean norm: %12.6f\n", stat->asum/ct);
fprintf(stderr, "Mean amplitude: %12.6f\n", stat->sum1/ct);
fprintf(stderr, "RMS amplitude: %12.6f\n", sqrt(stat->sum2/ct));
fprintf(stderr, "Maximum delta: %12.6f\n", stat->dmax);
fprintf(stderr, "Minimum delta: %12.6f\n", stat->dmin);
fprintf(stderr, "Mean delta: %12.6f\n", stat->dsum1/(ct-1));
fprintf(stderr, "RMS delta: %12.6f\n", sqrt(stat->dsum2/(ct-1)));
freq = sqrt(stat->dsum2/stat->sum2)*effp->ininfo.rate/(M_PI*2);
fprintf(stderr, "Rough frequency: %12d\n", (int)freq);
if (amp>0) fprintf(stderr, "Volume adjustment: %12.3f\n", MAXLONG/(amp*scale));
if (stat->bin[2] == 0 && stat->bin[3] == 0)
fprintf(stderr, "\nProbably text, not sound\n");
else {
x = (float)(stat->bin[0] + stat->bin[3]) / (float)(stat->bin[1] + stat->bin[2]);
if (x >= 3.0) /* use opposite style */
{
if (effp->ininfo.style == UNSIGNED)
{
printf ("\nTry: -t raw -b -s \n");
}
else
{
printf ("\nTry: -t raw -b -u \n");
}
}
else if (x <= 1.0/3.0)
{
;; /* correctly decoded */
}
else if (x >= 0.5 && x <= 2.0) /* use ULAW */
{
if (effp->ininfo.style == ULAW)
{
printf ("\nTry: -t raw -b -u \n");
}
else
{
printf ("\nTry: -t raw -b -U \n");
}
}
else
{
fprintf (stderr, "\nCan't guess the type\n");
}
}
}