Sound, Music & MIDI Collection 2/SMMVOL2.bin/WAVUTIL/SOX7.ZIP/STAT.C

C/C++ Source or Header | 1993-02-11 | 4.6 KB | 188 lines

/*
 * 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 "st.h"

/* Private data for STAT effect */
typedef struct statstuff {
    long    min, max, mean;        /* amplitudes */
    long    dmin, dmax, dmean;    /* deltas */
    long    last;            /* previous sample */
    int    first;
    int    total;
    int    volume;
        unsigned long bin[4];
} *stat_t;

#define    abs(val)    (((val) < 0) ? -(val) : (val))

/*
 * Process options
 */
stat_getopts(effp, n, argv)
eff_t effp;
int n;
char **argv;
{
    stat_t stat = (stat_t) effp->priv;

    stat->volume = 0;
    if (n)
        if (strcmp(argv[0], "-V"))
            stat->volume = 1;
        else
            fail("Summary effect takes no options.");
}

/*
 * Prepare processing.
 */
stat_start(effp)
eff_t effp;
{
    stat_t stat = (stat_t) effp->priv;
        int i;

    stat->min = stat->dmin = 0x7fffffff;
    stat->max = stat->dmax = 0x80000000;
    stat->first = 1;

        for (i = 0; i < 4; i++)
                stat->bin[i] = 0;
}

/*
 * Processed signed long samples from ibuf to obuf.
 * Return number of samples processed.
 */

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;
    long samp, delta;

    len = ((*isamp > *osamp) ? *osamp : *isamp);
    for(done = 0; done < len; done++) {
        /* work in absolute levels for both sample and delta */
        samp = *ibuf++;
            *obuf++ = samp;

                stat->bin[RIGHT(samp,30)+2]++;

        samp = abs(samp);
        if (samp < stat->min)
            stat->min = samp;
        if (samp > stat->max)
            stat->max = samp;
        if (stat->first) {
            stat->first = 0;
            stat->mean = samp;
            stat->dmean = 0;
        } else  {
            /* overflow avoidance */
            if ((stat->mean > 0x20000000) || (samp > 0x20000000))
                stat->mean = stat->mean/2 + samp/2;
            else
                stat->mean = (stat->mean + samp)/2;

            delta = abs(samp - stat->last);
            if (delta < stat->dmin)
                stat->dmin = delta;
            if (delta > stat->dmax)
                stat->dmax = delta;
            /* overflow avoidance */
            if ((delta > 0x20000000) || (stat->dmean > 0x20000000))
                stat->dmean = stat->dmean/2 + delta/2;
            else
                stat->dmean = (stat->dmean + delta)/2;
        }
        stat->last = samp;
    }
    /* 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, range;
        float x;

    stat->min   = RIGHT(stat->min, 16);
    stat->max   = RIGHT(stat->max, 16);
    stat->mean  = RIGHT(stat->mean, 16);
    stat->dmin  = RIGHT(stat->dmin, 16);
    stat->dmax  = RIGHT(stat->dmax, 16);
    stat->dmean = RIGHT(stat->dmean, 16);

    range = 32767.0;

    amp = - stat->min;
    if (amp < stat->max)
        amp = stat->max;
    /* Just print the volume adjustment */
    if (stat->volume) {
        fprintf(stderr, "%.3f\n", 32767.0/amp);
        return;
    }
    /* print them out */
    fprintf(stderr, "Maximum amplitude: %.3f\n", stat->max/range);
    fprintf(stderr, "Minimum amplitude: %.3f\n", stat->min/range);
    fprintf(stderr, "Mean    amplitude: %.3f\n", stat->mean/range);

    fprintf(stderr, "Maximum delta:     %.3f\n", stat->dmax/range);
    fprintf(stderr, "Minimum delta:     %.3f\n", stat->dmin/range);
    fprintf(stderr, "Mean    delta:     %.3f\n", stat->dmean/range);

    fprintf(stderr, "Volume adjustment: %.3f\n", 32767.0/amp);

        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");
        }

}