mirror of
https://github.com/cookiengineer/audacity
synced 2025-11-03 23:53:55 +01:00
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/* SoX Resampler Library Copyright (c) 2007-13 robs@users.sourceforge.net
|
|
* Licence for this file: LGPL v2.1 See LICENCE for details. */
|
|
|
|
/* Utility used to help test the library; not for general consumption.
|
|
*
|
|
* Compare two swept-sine files. */
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <math.h>
|
|
#include "../src/rint.h"
|
|
|
|
int main(int bit, char const * arg[])
|
|
{
|
|
FILE * f1 = fopen(arg[1], "rb"),
|
|
* f2 = fopen(arg[2], "rb");
|
|
double rate = atof (arg[3]), /* Rate for this vector */
|
|
leader_len = atof (arg[4]), /* Leader length in seconds */
|
|
len = atof (arg[5]), /* Sweep length (excl. leader_len) */
|
|
expect_bits= atof (arg[6]),
|
|
expect_bw = atof (arg[7]);
|
|
|
|
int32_t s1, s2;
|
|
long count = 0;
|
|
static long thresh[32];
|
|
double bw, prev = 0;
|
|
|
|
for (; fread(&s1, sizeof(s1), 1, f1) == 1 &&
|
|
fread(&s2, sizeof(s2), 1, f2) == 1; ++count) {
|
|
long diff = abs((int)(s1 - s2));
|
|
for (bit = 0; diff && bit < 32; bit++, diff >>= 1)
|
|
if ((diff & 1) && !thresh[bit])
|
|
thresh[bit] = count + 1;
|
|
}
|
|
|
|
if (count != (long)((leader_len + len) * rate + .5)) {
|
|
printf("incorrect file length\n");
|
|
exit(1);
|
|
}
|
|
|
|
for (bit = 0; bit < 32; ++bit) {
|
|
bw = ((double)thresh[bit] - 1) / rate - leader_len;
|
|
if (bit && bw >= 0 && (bw - prev) * 100 / len < .08) {
|
|
--bit;
|
|
break;
|
|
}
|
|
prev = bw;
|
|
}
|
|
bit = 32 - bit;
|
|
bw = bw * 100 / len;
|
|
printf("Bit perfect to %i bits, from DC to %.2f%% nyquist.\n", bit, bw);
|
|
return !(bit >= expect_bits && bw >= expect_bw);
|
|
}
|