Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * simple math operations | |
3 | * Copyright (c) 2001, 2002 Fabrice Bellard | |
4 | * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | #ifndef AVCODEC_MATHOPS_H | |
23 | #define AVCODEC_MATHOPS_H | |
24 | ||
25 | #include <stdint.h> | |
26 | ||
27 | #include "libavutil/common.h" | |
28 | #include "config.h" | |
29 | ||
30 | #define MAX_NEG_CROP 1024 | |
31 | ||
32 | extern const uint32_t ff_inverse[257]; | |
33 | extern const uint8_t ff_reverse[256]; | |
34 | extern const uint8_t ff_sqrt_tab[256]; | |
35 | extern const uint8_t ff_crop_tab[256 + 2 * MAX_NEG_CROP]; | |
36 | extern const uint8_t ff_zigzag_direct[64]; | |
37 | ||
38 | #if ARCH_ARM | |
39 | # include "arm/mathops.h" | |
40 | #elif ARCH_AVR32 | |
41 | # include "avr32/mathops.h" | |
42 | #elif ARCH_MIPS | |
43 | # include "mips/mathops.h" | |
44 | #elif ARCH_PPC | |
45 | # include "ppc/mathops.h" | |
46 | #elif ARCH_X86 | |
47 | # include "x86/mathops.h" | |
48 | #endif | |
49 | ||
50 | /* generic implementation */ | |
51 | ||
52 | #ifndef MUL64 | |
53 | # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b)) | |
54 | #endif | |
55 | ||
56 | #ifndef MULL | |
57 | # define MULL(a,b,s) (MUL64(a, b) >> (s)) | |
58 | #endif | |
59 | ||
60 | #ifndef MULH | |
61 | static av_always_inline int MULH(int a, int b){ | |
62 | return MUL64(a, b) >> 32; | |
63 | } | |
64 | #endif | |
65 | ||
66 | #ifndef UMULH | |
67 | static av_always_inline unsigned UMULH(unsigned a, unsigned b){ | |
68 | return ((uint64_t)(a) * (uint64_t)(b))>>32; | |
69 | } | |
70 | #endif | |
71 | ||
72 | #ifndef MAC64 | |
73 | # define MAC64(d, a, b) ((d) += MUL64(a, b)) | |
74 | #endif | |
75 | ||
76 | #ifndef MLS64 | |
77 | # define MLS64(d, a, b) ((d) -= MUL64(a, b)) | |
78 | #endif | |
79 | ||
80 | /* signed 16x16 -> 32 multiply add accumulate */ | |
81 | #ifndef MAC16 | |
82 | # define MAC16(rt, ra, rb) rt += (ra) * (rb) | |
83 | #endif | |
84 | ||
85 | /* signed 16x16 -> 32 multiply */ | |
86 | #ifndef MUL16 | |
87 | # define MUL16(ra, rb) ((ra) * (rb)) | |
88 | #endif | |
89 | ||
90 | #ifndef MLS16 | |
91 | # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb)) | |
92 | #endif | |
93 | ||
94 | /* median of 3 */ | |
95 | #ifndef mid_pred | |
96 | #define mid_pred mid_pred | |
97 | static inline av_const int mid_pred(int a, int b, int c) | |
98 | { | |
99 | #if 0 | |
100 | int t= (a-b)&((a-b)>>31); | |
101 | a-=t; | |
102 | b+=t; | |
103 | b-= (b-c)&((b-c)>>31); | |
104 | b+= (a-b)&((a-b)>>31); | |
105 | ||
106 | return b; | |
107 | #else | |
108 | if(a>b){ | |
109 | if(c>b){ | |
110 | if(c>a) b=a; | |
111 | else b=c; | |
112 | } | |
113 | }else{ | |
114 | if(b>c){ | |
115 | if(c>a) b=c; | |
116 | else b=a; | |
117 | } | |
118 | } | |
119 | return b; | |
120 | #endif | |
121 | } | |
122 | #endif | |
123 | ||
124 | #ifndef sign_extend | |
125 | static inline av_const int sign_extend(int val, unsigned bits) | |
126 | { | |
127 | unsigned shift = 8 * sizeof(int) - bits; | |
128 | union { unsigned u; int s; } v = { (unsigned) val << shift }; | |
129 | return v.s >> shift; | |
130 | } | |
131 | #endif | |
132 | ||
133 | #ifndef zero_extend | |
134 | static inline av_const unsigned zero_extend(unsigned val, unsigned bits) | |
135 | { | |
136 | return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits); | |
137 | } | |
138 | #endif | |
139 | ||
140 | #ifndef COPY3_IF_LT | |
141 | #define COPY3_IF_LT(x, y, a, b, c, d)\ | |
142 | if ((y) < (x)) {\ | |
143 | (x) = (y);\ | |
144 | (a) = (b);\ | |
145 | (c) = (d);\ | |
146 | } | |
147 | #endif | |
148 | ||
149 | #ifndef MASK_ABS | |
150 | #define MASK_ABS(mask, level) do { \ | |
151 | mask = level >> 31; \ | |
152 | level = (level ^ mask) - mask; \ | |
153 | } while (0) | |
154 | #endif | |
155 | ||
156 | #ifndef NEG_SSR32 | |
157 | # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s))) | |
158 | #endif | |
159 | ||
160 | #ifndef NEG_USR32 | |
161 | # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s))) | |
162 | #endif | |
163 | ||
164 | #if HAVE_BIGENDIAN | |
165 | # ifndef PACK_2U8 | |
166 | # define PACK_2U8(a,b) (((a) << 8) | (b)) | |
167 | # endif | |
168 | # ifndef PACK_4U8 | |
169 | # define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d)) | |
170 | # endif | |
171 | # ifndef PACK_2U16 | |
172 | # define PACK_2U16(a,b) (((a) << 16) | (b)) | |
173 | # endif | |
174 | #else | |
175 | # ifndef PACK_2U8 | |
176 | # define PACK_2U8(a,b) (((b) << 8) | (a)) | |
177 | # endif | |
178 | # ifndef PACK_4U2 | |
179 | # define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a)) | |
180 | # endif | |
181 | # ifndef PACK_2U16 | |
182 | # define PACK_2U16(a,b) (((b) << 16) | (a)) | |
183 | # endif | |
184 | #endif | |
185 | ||
186 | #ifndef PACK_2S8 | |
187 | # define PACK_2S8(a,b) PACK_2U8((a)&255, (b)&255) | |
188 | #endif | |
189 | #ifndef PACK_4S8 | |
190 | # define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255) | |
191 | #endif | |
192 | #ifndef PACK_2S16 | |
193 | # define PACK_2S16(a,b) PACK_2U16((a)&0xffff, (b)&0xffff) | |
194 | #endif | |
195 | ||
196 | #ifndef FASTDIV | |
197 | # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32)) | |
198 | #endif /* FASTDIV */ | |
199 | ||
200 | static inline av_const unsigned int ff_sqrt(unsigned int a) | |
201 | { | |
202 | unsigned int b; | |
203 | ||
204 | if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4; | |
205 | else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2; | |
206 | #if !CONFIG_SMALL | |
207 | else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1; | |
208 | else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8] ; | |
209 | #endif | |
210 | else { | |
211 | int s = av_log2_16bit(a >> 16) >> 1; | |
212 | unsigned int c = a >> (s + 2); | |
213 | b = ff_sqrt_tab[c >> (s + 8)]; | |
214 | b = FASTDIV(c,b) + (b << s); | |
215 | } | |
216 | ||
217 | return b - (a < b * b); | |
218 | } | |
219 | ||
220 | static inline int8_t ff_u8_to_s8(uint8_t a) | |
221 | { | |
222 | union { | |
223 | uint8_t u8; | |
224 | int8_t s8; | |
225 | } b; | |
226 | b.u8 = a; | |
227 | return b.s8; | |
228 | } | |
229 | ||
230 | #endif /* AVCODEC_MATHOPS_H */ |