mirror of
https://github.com/cookiengineer/audacity
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57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
/* SoX Resampler Library Copyright (c) 2007-13 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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* Generate a swept sine to a file, with faded `lead-in' section. */
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#define QUAD 0
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#if QUAD
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#include <quadmath.h>
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#endif
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#include "../examples/examples-common.h"
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#if QUAD
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#define modf modfq
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#define cos cosq
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#define sin sinq
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#undef M_PI
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#define M_PI M_PIq
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#define real __float128
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#define atof(x) strtoflt128(x, 0)
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#else
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#define real double
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#include "rint.h"
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#endif
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int main(int i, char const * argv[])
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{
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real rate = atof(argv[1]), /* Rate for this vector */
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lead_in_len = atof(argv[2]), /* Lead-in length in seconds */
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len = atof(argv[3]), /* Sweep length (excl. lead_in_len) */
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sweep_to_freq = atof(argv[4]), /* Sweep from DC to this freq. */
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multiplier = atof(argv[5]), /* For headroom */
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f1 = -sweep_to_freq / len * lead_in_len, f2 = sweep_to_freq,
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n1 = rate * -lead_in_len, n2 = rate * len,
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m = (f2 - f1) / (n2 - n1) / 2, dummy;
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FILE * file = fopen(argv[6], "wb");
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i = (int)n1;
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if (!file || i != n1)
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exit(1);
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for (; i < (int)(n2 + .5); ++i) {
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double d1 = multiplier * sin(2 * M_PI * modf(i * m * i / rate, &dummy));
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double d = i < 0? d1 * (1 - cos(M_PI * (i + n1) / n1)) * .5 : d1;
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#if QUAD
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size_t actual = fwrite(&d, sizeof(d), 1, file);
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#else
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int32_t out = rint32(d * (32768. * 65536 - 1));
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size_t actual = fwrite(&out, sizeof(out), 1, file);
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#endif
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if (actual != 1)
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return 1;
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}
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return 0;
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}
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