forked from len0rd/rockbox
526b5580da
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21070 a1c6a512-1295-4272-9138-f99709370657
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
#ifndef __M_FIXED_H__
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#define __M_FIXED_H__
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typedef int t_sample;
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#define t_fixed int
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#define fix1 18 /* (18) number of bits after comma */
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#define fixfac ((float)(1<<fix1)) /* float factor (for scaling ftofix ..) */
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/* fixed point multiplication and division */
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#define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1)
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#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
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/* conversion macros */
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#define itofix(a) ((a) << fix1)
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#define ftofix(a) ((t_fixed)( (a) *(double)fixfac + 0.5))
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#define fixtof(a) ((double) (a) * 1./(fixfac-0.5))
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#define fixtoi(a) ((a) >>fix1)
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/* Not working !! */
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#define fnum(a) ( (a) >>(fix1-16))
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#define ffrac(a) (0)
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/* mapping of fft functions */
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#ifdef FIXEDPOINT
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#define mayer_realifft imayer_realifft
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#define mayer_realfft imayer_realfft
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#define mayer_fft imayer_fft
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#define mayer_ifft imayer_ifft
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#endif
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#ifdef FIXEDPOINT
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#define SCALE16(x) (x>>(fix1-15))
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#define SCALE32(x) (x<<(32-fix1))
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#define INVSCALE16(x) (x<<8)
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#else
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#define SCALE16(x) (32767.*x)
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#define SCALE32(x) (2147483648.*x)
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#define INVSCALE16(x) ((float)3.051850e-05*x)
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#endif
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#endif
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