145 lines
3.8 KiB
C
145 lines
3.8 KiB
C
#ifndef __FMATH_H__
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#define __FMATH_H__
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#include<stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef INLINE
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#ifdef _MSC_VER
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#define INLINE __inline
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#else
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#define INLINE inline
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#endif /* _MSC_VER */
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#endif /* INLINE */
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// typedef int32_t inumber;
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typedef int16_t inumber;
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//#define __Q8P24__
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#define Q_PCM_16_MAX
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#define Q_PCM_16_MIN
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// Qbits
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#ifdef __Q8P24__
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#define FIXED_FRACBITS 24
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#define Q_PCM_MAX 16609444
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#define Q_PCM_MIN -16609444
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#endif
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#ifdef __Q17P15__
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#define FIXED_FRACBITS 15
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#define Q_PCM_MAX 32767
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#define Q_PCM_MIN -32768
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#endif
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#ifdef __Q8P23__
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#define FIXED_FRACBITS 23
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#define Q_PCM_MAX 8304721
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#define Q_PCM_MIN -8304721
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#endif
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#define Q_PCM_16_MAX 32767
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#define Q_PCM_16_MIN -32768
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#define FIXED_RESOLUTION (1 << FIXED_FRACBITS)
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#define FIXED_INT_MASK (0xffffffffL << FIXED_FRACBITS)
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#define FIXED_FRAC_MASK (~FIXED_INT_MASK)
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// square roots
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#define FIXED_SQRT_ERR (1 << (FIXED_FRACBITS - 10))
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// fixedp2a
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#define FIXED_DECIMALDIGITS
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#define FIXED_FRACBITS 16
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// transform Iinteger or floating point into fixed point(Q-format)
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#ifdef __LINUX__
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#define PCM_N_INT_TO_Q( N, bits, Qbits ) (inumber)( (N)/(float)(1<<((bits)-1)) * (uint32_t)(1<<((Qbits))) )
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#define PCM_N_Q_TO_INT( Q, bits, Qbits ) ( (float)(Q)/(uint32_t)(1<<((Qbits))) * (uint32_t)(1<<((bits)-1)) )
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#define PCM_N_FLOAT_TO_Q(N,Qbits) (inumber)( (N) * (uint32_t)(1<<(Qbits)) )
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#define PCM_N_Q_TO_FLOAT(Q,Qbits) ( Q /(float)(1<<((Qbits))) )
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#endif
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#define PCM_Q_RANGE(Q,Qbits) ( {\
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long v = Q;\
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long max = (uint32_t)(1 << ((Qbits)-1)) - 1;\
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if ( Q > max ) v = max;\
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else if ( Q < -max ) v = min;\
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v;\
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})
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#ifdef __LINUX__
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#define Q_TO_FLOAT(Q) ( Q /(float)FIXED_RESOLUTION )
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#endif
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#define Q_TO_INT(Q) ( (Q) >>FIXED_FRACBITS )
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#define FLOAT_TO_Q(N) (inumber)((N) * FIXED_RESOLUTION)
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#define INT_TO_Q(N) (inumber)((N) << FIXED_FRACBITS)
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#define Q_ADD(A,B) ((A) + (B))
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#define Q_SUB(A,B) ((A) - (B))
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#ifdef __Q17P15__
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#define Q_MUL(A,B) (int32_t)(((int32_t)(A) * (int32_t)(B)) >> FIXED_FRACBITS )
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#define Q_DIV(A,B) (int32_t)(((int32_t)(A)<<FIXED_FRACBITS) / (B))
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#define Q_INV(A) ((inumber)((((int32_t)1) << (2*FIXED_FRACBITS)) / (A)))
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#else
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#define Q_MUL(A,B) (int32_t)(((int64_t)(A) * (int64_t)(B)) >> FIXED_FRACBITS )
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#define Q_DIV(A,B) (int32_t)(((int64_t)(A)<<FIXED_FRACBITS) / (B))
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#define Q_INV(A) ((inumber)((((int64_t)1) << (2*FIXED_FRACBITS)) / (A)))
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#endif
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#define Q_MOD(A,B) ( (A) % (B) )
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#define Q_PART_INT(A) Q_TO_INT(A)
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#define Q_PART_FLOAT(A) ((A) & FIXED_FRAC_MASK)
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#ifdef __Q8P24__
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#define Q_PI 52707178
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#define Q_2PI 105414357
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#define Q_PIO2 26353589
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#define Q_PIO4 13176794
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#define Q_LNE 45605201
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#define Q_LN10 38630967
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#define Q_10LN10 7286252
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#else
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#define Q_PI 26353589
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#define Q_2PI 52707178
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#define Q_PIO2 13176794
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#define Q_PIO4 6588397
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#define Q_LNE 22802600
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#define Q_LN10 19315483
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#define Q_10LN10 3643126
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#endif
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#define qabs(A) ( ((A) < 0) ? (-A) : (A) )
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#define qfloor(A) ((A) & (0xffffffff<<FIXED_FRACBITS))
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static inline inumber qceil(inumber x)
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{
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inumber f = qfloor(x);
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if (f != x) {
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return f + INT_TO_Q(1);
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}
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return x;
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}
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extern inumber qsin(inumber radian);
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extern inumber qcos(inumber radian);
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extern inumber qtan(inumber radian);
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extern inumber qlog(inumber value);
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extern inumber qlog10(inumber value);
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extern inumber qsqrt(inumber value);
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extern inumber qexp(inumber value);
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extern inumber qpow(inumber x, inumber y);
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#ifdef __cplusplus
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} // extern C
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#endif
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#endif
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