57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* SoX Resampler Library Copyright (c) 2007-16 robs@users.sourceforge.net
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* Licence for this file: LGPL v2.1 See LICENCE for details. */
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/* Utility used to help test the library; not for general consumption.
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*
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* Measure the peak bit difference between two files. */
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#include <stdlib.h>
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#include <stdio.h>
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#include "../src/rint.h"
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#include "../examples/examples-common.h"
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#define TYPE 0 /* As vector-gen */
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#if TYPE
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#define sample_t double
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#define N 50
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#define DIFF(s1,s2) abs(rint32((s1-s2)*ldexp(1,N-1)))
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#else
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#define sample_t int32_t
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#define N 32
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#define DIFF(s1,s2) abs((int)(s1-s2))
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#endif
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int main(int argc, char const * arg[])
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{
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int two = !!arg[2][0];
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FILE * f1 = fopen(arg[1], "rb"), * f2 = two? fopen(arg[2], "rb") : 0;
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double rate = atof (arg[3]), /* Sample-rate */
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skip_len = atof (arg[4]), /* Skip length in seconds */
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len = atof (arg[5]), /* Compare length in seconds */ r;
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int i = 0, count = rint32(rate * len), max = 0, diff;
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sample_t s1, s2;
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fseek(f1, rint32(rate * skip_len) * (int)sizeof(s1), SEEK_CUR);
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if (two) {
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fseek(f2, rint32(rate * skip_len) * (int)sizeof(s2), SEEK_CUR);
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for (; i < count &&
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fread(&s1, sizeof(s1), 1, f1) &&
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fread(&s2, sizeof(s2), 1, f2); ++i) {
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diff = DIFF(s1, s2);
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max = max(max, diff);
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}
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}
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else for (; i < count && fread(&s1, sizeof(s1), 1, f1); ++i) {
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diff = DIFF(s1, 0);
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max = max(max, diff);
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}
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if (i != count) {
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fprintf(stderr, "incorrect file length\n");
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return 1;
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}
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printf("%f\n", r = N-log(max)/log(2));
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return argc>6? r<atof(arg[6]) : 0;
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}
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