61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
#ifndef __AVMD_DESA2_TWEAKED_H__
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#include <switch.h>
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#include <stdio.h>
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#ifdef WIN32
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#include <float.h>
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#define ISNAN(x) (!!(_isnan(x)))
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#else
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#define ISNAN(x) (isnan(x))
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#endif
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#include "avmd_buffer.h"
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#include "avmd_desa2_tweaked.h"
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#include "avmd_options.h"
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#ifdef AVMD_FAST_MATH
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#include "avmd_fast_acosf.h"
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#endif
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double
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avmd_desa2_tweaked(circ_buffer_t *b, size_t i)
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{
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double d;
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double n;
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double x0;
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double x1;
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double x2;
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double x3;
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double x4;
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double x2sq;
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double result;
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x0 = GET_SAMPLE((b), (i));
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x1 = GET_SAMPLE((b), ((i) + 1));
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x2 = GET_SAMPLE((b), ((i) + 2));
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x3 = GET_SAMPLE((b), ((i) + 3));
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x4 = GET_SAMPLE((b), ((i) + 4));
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x2sq = x2 * x2;
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d = 2.0 * ((x2sq) - (x1 * x3));
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n = ((x2sq) - (x0 * x4)) - ((x1 * x1)
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- (x0 * x2)) - ((x3 * x3) - (x2 * x4));
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/* instead of
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#ifdef FASTMATH
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result = 0.5 * (double)fast_acosf((float)n/d);
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#else
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result = 0.5 * acos(n/d);
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#endif
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we do simplified, modified for speed version : */
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result = n/d;
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if (isinf(result)) {
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if (n < 0.0)
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return -10.0;
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else
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return 10.0;
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}
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return result;
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}
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#endif /* __AVMD_DESA2_TWEAKED_H__ */
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