1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef AVUTIL_TX_PRIV_H
20 #define AVUTIL_TX_PRIV_H
21
22 #include "tx.h"
23 #include <stddef.h>
24 #include "thread.h"
25 #include "mem.h"
26 #include "avassert.h"
27 #include "attributes.h"
28
29 #ifdef TX_FLOAT
30 #define TX_NAME(x) x ## _float
31 #define SCALE_TYPE float
32 typedef float FFTSample;
33 typedef AVComplexFloat FFTComplex;
34 #elif defined(TX_DOUBLE)
35 #define TX_NAME(x) x ## _double
36 #define SCALE_TYPE double
37 typedef double FFTSample;
38 typedef AVComplexDouble FFTComplex;
39 #elif defined(TX_INT32)
40 #define TX_NAME(x) x ## _int32
41 #define SCALE_TYPE float
42 typedef int32_t FFTSample;
43 typedef AVComplexInt32 FFTComplex;
44 #else
45 typedef void FFTComplex;
46 #endif
47
48 #if defined(TX_FLOAT) || defined(TX_DOUBLE)
49
50 #define CMUL(dre, dim, are, aim, bre, bim) do { \
51 (dre) = (are) * (bre) - (aim) * (bim); \
52 (dim) = (are) * (bim) + (aim) * (bre); \
53 } while (0)
54
55 #define SMUL(dre, dim, are, aim, bre, bim) do { \
56 (dre) = (are) * (bre) - (aim) * (bim); \
57 (dim) = (are) * (bim) - (aim) * (bre); \
58 } while (0)
59
60 #define RESCALE(x) (x)
61
62 #define FOLD(a, b) ((a) + (b))
63
64 #elif defined(TX_INT32)
65
66 /* Properly rounds the result */
67 #define CMUL(dre, dim, are, aim, bre, bim) do { \
68 int64_t accu; \
69 (accu) = (int64_t)(bre) * (are); \
70 (accu) -= (int64_t)(bim) * (aim); \
71 (dre) = (int)(((accu) + 0x40000000) >> 31); \
72 (accu) = (int64_t)(bim) * (are); \
73 (accu) += (int64_t)(bre) * (aim); \
74 (dim) = (int)(((accu) + 0x40000000) >> 31); \
75 } while (0)
76
77 #define SMUL(dre, dim, are, aim, bre, bim) do { \
78 int64_t accu; \
79 (accu) = (int64_t)(bre) * (are); \
80 (accu) -= (int64_t)(bim) * (aim); \
81 (dre) = (int)(((accu) + 0x40000000) >> 31); \
82 (accu) = (int64_t)(bim) * (are); \
83 (accu) -= (int64_t)(bre) * (aim); \
84 (dim) = (int)(((accu) + 0x40000000) >> 31); \
85 } while (0)
86
87 #define RESCALE(x) (lrintf((x) * 2147483648.0))
88
89 #define FOLD(x, y) ((int)((x) + (unsigned)(y) + 32) >> 6)
90
91 #endif
92
93 #define BF(x, y, a, b) do { \
94 x = (a) - (b); \
95 y = (a) + (b); \
96 } while (0)
97
98 #define CMUL3(c, a, b) \
99 CMUL((c).re, (c).im, (a).re, (a).im, (b).re, (b).im)
100
101 #define COSTABLE(size) \
102 DECLARE_ALIGNED(32, FFTSample, TX_NAME(ff_cos_##size))[size/2]
103
104 /* Used by asm, reorder with care */
105 struct AVTXContext {
106 int n; /* Nptwo part */
107 int m; /* Ptwo part */
108 int inv; /* Is inverted */
109 int type; /* Type */
110
111 FFTComplex *exptab; /* MDCT exptab */
112 FFTComplex *tmp; /* Temporary buffer needed for all compound transforms */
113 int *pfatab; /* Input/Output mapping for compound transforms */
114 int *revtab; /* Input mapping for power of two transforms */
115 };
116
117 /* Shared functions */
118 int ff_tx_type_is_mdct(enum AVTXType type);
119 int ff_tx_gen_compound_mapping(AVTXContext *s);
120 int ff_tx_gen_ptwo_revtab(AVTXContext *s);
121
122 /* Also used by SIMD init */
split_radix_permutation(int i,int n,int inverse)123 static inline int split_radix_permutation(int i, int n, int inverse)
124 {
125 int m;
126 if (n <= 2)
127 return i & 1;
128 m = n >> 1;
129 if (!(i & m))
130 return split_radix_permutation(i, m, inverse)*2;
131 m >>= 1;
132 if (inverse == !(i & m))
133 return split_radix_permutation(i, m, inverse)*4 + 1;
134 else
135 return split_radix_permutation(i, m, inverse)*4 - 1;
136 }
137
138 /* Templated functions */
139 int ff_tx_init_mdct_fft_float(AVTXContext *s, av_tx_fn *tx,
140 enum AVTXType type, int inv, int len,
141 const void *scale, uint64_t flags);
142 int ff_tx_init_mdct_fft_double(AVTXContext *s, av_tx_fn *tx,
143 enum AVTXType type, int inv, int len,
144 const void *scale, uint64_t flags);
145 int ff_tx_init_mdct_fft_int32(AVTXContext *s, av_tx_fn *tx,
146 enum AVTXType type, int inv, int len,
147 const void *scale, uint64_t flags);
148
149 typedef struct CosTabsInitOnce {
150 void (*func)(void);
151 AVOnce control;
152 } CosTabsInitOnce;
153
154 #endif /* AVUTIL_TX_PRIV_H */
155