1/*Copyright (c) 2003-2004, Mark Borgerding
2
3  All rights reserved.
4
5  Redistribution and use in source and binary forms, with or without
6   modification, are permitted provided that the following conditions are met:
7
8    * Redistributions of source code must retain the above copyright notice,
9       this list of conditions and the following disclaimer.
10    * Redistributions in binary form must reproduce the above copyright notice,
11       this list of conditions and the following disclaimer in the
12       documentation and/or other materials provided with the distribution.
13
14  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24  POSSIBILITY OF SUCH DAMAGE.*/
25
26#ifndef KISS_FFT_GUTS_H
27#define KISS_FFT_GUTS_H
28
29#define MIN(a,b) ((a)<(b) ? (a):(b))
30#define MAX(a,b) ((a)>(b) ? (a):(b))
31
32/* kiss_fft.h
33   defines kiss_fft_scalar as either short or a float type
34   and defines
35   typedef struct { kiss_fft_scalar r; kiss_fft_scalar i; }kiss_fft_cpx; */
36#include "kiss_fft.h"
37
38/*
39  Explanation of macros dealing with complex math:
40
41   C_MUL(m,a,b)         : m = a*b
42   C_FIXDIV( c , div )  : if a fixed point impl., c /= div. noop otherwise
43   C_SUB( res, a,b)     : res = a - b
44   C_SUBFROM( res , a)  : res -= a
45   C_ADDTO( res , a)    : res += a
46 * */
47#ifdef FIXED_POINT
48#include "arch.h"
49
50
51#define SAMP_MAX 2147483647
52#define TWID_MAX 32767
53#define TRIG_UPSCALE 1
54
55#define SAMP_MIN -SAMP_MAX
56
57
58#   define S_MUL(a,b) MULT16_32_Q15(b, a)
59
60#   define C_MUL(m,a,b) \
61      do{ (m).r = SUB32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)); \
62          (m).i = ADD32(S_MUL((a).r,(b).i) , S_MUL((a).i,(b).r)); }while(0)
63
64#   define C_MULC(m,a,b) \
65      do{ (m).r = ADD32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)); \
66          (m).i = SUB32(S_MUL((a).i,(b).r) , S_MUL((a).r,(b).i)); }while(0)
67
68#   define C_MUL4(m,a,b) \
69      do{ (m).r = SHR32(SUB32(S_MUL((a).r,(b).r) , S_MUL((a).i,(b).i)),2); \
70          (m).i = SHR32(ADD32(S_MUL((a).r,(b).i) , S_MUL((a).i,(b).r)),2); }while(0)
71
72#   define C_MULBYSCALAR( c, s ) \
73      do{ (c).r =  S_MUL( (c).r , s ) ;\
74          (c).i =  S_MUL( (c).i , s ) ; }while(0)
75
76#   define DIVSCALAR(x,k) \
77        (x) = S_MUL(  x, (TWID_MAX-((k)>>1))/(k)+1 )
78
79#   define C_FIXDIV(c,div) \
80        do {    DIVSCALAR( (c).r , div);  \
81                DIVSCALAR( (c).i  , div); }while (0)
82
83#define  C_ADD( res, a,b)\
84    do {(res).r=ADD32((a).r,(b).r);  (res).i=ADD32((a).i,(b).i); \
85    }while(0)
86#define  C_SUB( res, a,b)\
87    do {(res).r=SUB32((a).r,(b).r);  (res).i=SUB32((a).i,(b).i); \
88    }while(0)
89#define C_ADDTO( res , a)\
90    do {(res).r = ADD32((res).r, (a).r);  (res).i = ADD32((res).i,(a).i);\
91    }while(0)
92
93#define C_SUBFROM( res , a)\
94    do {(res).r = ADD32((res).r,(a).r);  (res).i = SUB32((res).i,(a).i); \
95    }while(0)
96
97#if defined(OPUS_ARM_INLINE_ASM)
98#include "arm/kiss_fft_armv4.h"
99#endif
100
101#if defined(OPUS_ARM_INLINE_EDSP)
102#include "arm/kiss_fft_armv5e.h"
103#endif
104
105#else  /* not FIXED_POINT*/
106
107#   define S_MUL(a,b) ( (a)*(b) )
108#define C_MUL(m,a,b) \
109    do{ (m).r = (a).r*(b).r - (a).i*(b).i;\
110        (m).i = (a).r*(b).i + (a).i*(b).r; }while(0)
111#define C_MULC(m,a,b) \
112    do{ (m).r = (a).r*(b).r + (a).i*(b).i;\
113        (m).i = (a).i*(b).r - (a).r*(b).i; }while(0)
114
115#define C_MUL4(m,a,b) C_MUL(m,a,b)
116
117#   define C_FIXDIV(c,div) /* NOOP */
118#   define C_MULBYSCALAR( c, s ) \
119    do{ (c).r *= (s);\
120        (c).i *= (s); }while(0)
121#endif
122
123#ifndef CHECK_OVERFLOW_OP
124#  define CHECK_OVERFLOW_OP(a,op,b) /* noop */
125#endif
126
127#ifndef C_ADD
128#define  C_ADD( res, a,b)\
129    do { \
130            CHECK_OVERFLOW_OP((a).r,+,(b).r)\
131            CHECK_OVERFLOW_OP((a).i,+,(b).i)\
132            (res).r=(a).r+(b).r;  (res).i=(a).i+(b).i; \
133    }while(0)
134#define  C_SUB( res, a,b)\
135    do { \
136            CHECK_OVERFLOW_OP((a).r,-,(b).r)\
137            CHECK_OVERFLOW_OP((a).i,-,(b).i)\
138            (res).r=(a).r-(b).r;  (res).i=(a).i-(b).i; \
139    }while(0)
140#define C_ADDTO( res , a)\
141    do { \
142            CHECK_OVERFLOW_OP((res).r,+,(a).r)\
143            CHECK_OVERFLOW_OP((res).i,+,(a).i)\
144            (res).r += (a).r;  (res).i += (a).i;\
145    }while(0)
146
147#define C_SUBFROM( res , a)\
148    do {\
149            CHECK_OVERFLOW_OP((res).r,-,(a).r)\
150            CHECK_OVERFLOW_OP((res).i,-,(a).i)\
151            (res).r -= (a).r;  (res).i -= (a).i; \
152    }while(0)
153#endif /* C_ADD defined */
154
155#ifdef FIXED_POINT
156/*#  define KISS_FFT_COS(phase)  TRIG_UPSCALE*floor(MIN(32767,MAX(-32767,.5+32768 * cos (phase))))
157#  define KISS_FFT_SIN(phase)  TRIG_UPSCALE*floor(MIN(32767,MAX(-32767,.5+32768 * sin (phase))))*/
158#  define KISS_FFT_COS(phase)  floor(.5+TWID_MAX*cos (phase))
159#  define KISS_FFT_SIN(phase)  floor(.5+TWID_MAX*sin (phase))
160#  define HALF_OF(x) ((x)>>1)
161#elif defined(USE_SIMD)
162#  define KISS_FFT_COS(phase) _mm_set1_ps( cos(phase) )
163#  define KISS_FFT_SIN(phase) _mm_set1_ps( sin(phase) )
164#  define HALF_OF(x) ((x)*_mm_set1_ps(.5f))
165#else
166#  define KISS_FFT_COS(phase) (kiss_fft_scalar) cos(phase)
167#  define KISS_FFT_SIN(phase) (kiss_fft_scalar) sin(phase)
168#  define HALF_OF(x) ((x)*.5f)
169#endif
170
171#define  kf_cexp(x,phase) \
172        do{ \
173                (x)->r = KISS_FFT_COS(phase);\
174                (x)->i = KISS_FFT_SIN(phase);\
175        }while(0)
176
177#define  kf_cexp2(x,phase) \
178   do{ \
179      (x)->r = TRIG_UPSCALE*celt_cos_norm((phase));\
180      (x)->i = TRIG_UPSCALE*celt_cos_norm((phase)-32768);\
181}while(0)
182
183#endif /* KISS_FFT_GUTS_H */
184