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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c')
-rw-r--r-- | lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c b/lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c new file mode 100644 index 0000000000..c4fbe3b7bc --- /dev/null +++ b/lib/rbcodec/codecs/libwmavoice/libavutil/mathematics.c | |||
@@ -0,0 +1,183 @@ | |||
1 | /* | ||
2 | * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at> | ||
3 | * | ||
4 | * This file is part of FFmpeg. | ||
5 | * | ||
6 | * FFmpeg is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU Lesser General Public | ||
8 | * License as published by the Free Software Foundation; either | ||
9 | * version 2.1 of the License, or (at your option) any later version. | ||
10 | * | ||
11 | * FFmpeg is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
14 | * Lesser General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU Lesser General Public | ||
17 | * License along with FFmpeg; if not, write to the Free Software | ||
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file | ||
23 | * miscellaneous math routines and tables | ||
24 | */ | ||
25 | |||
26 | #include <assert.h> | ||
27 | #include <stdint.h> | ||
28 | #include <limits.h> | ||
29 | #include "mathematics.h" | ||
30 | |||
31 | const uint8_t ff_sqrt_tab[256]={ | ||
32 | 0, 16, 23, 28, 32, 36, 40, 43, 46, 48, 51, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 77, 79, 80, 82, 84, 85, 87, 88, 90, | ||
33 | 91, 92, 94, 95, 96, 98, 99,100,102,103,104,105,107,108,109,110,111,112,114,115,116,117,118,119,120,121,122,123,124,125,126,127, | ||
34 | 128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,144,145,146,147,148,149,150,151,151,152,153,154,155,156,156, | ||
35 | 157,158,159,160,160,161,162,163,164,164,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176,176,177,178,179,179,180,181, | ||
36 | 182,182,183,184,184,185,186,186,187,188,188,189,190,190,191,192,192,193,194,194,195,196,196,197,198,198,199,200,200,201,202,202, | ||
37 | 203,204,204,205,205,206,207,207,208,208,209,210,210,211,212,212,213,213,214,215,215,216,216,217,218,218,219,219,220,220,221,222, | ||
38 | 222,223,223,224,224,225,226,226,227,227,228,228,229,230,230,231,231,232,232,233,233,234,235,235,236,236,237,237,238,238,239,239, | ||
39 | 240,240,241,242,242,243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,251,252,252,253,253,254,254,255,255,255 | ||
40 | }; | ||
41 | |||
42 | const uint8_t ff_log2_tab[256]={ | ||
43 | 0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, | ||
44 | 5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5, | ||
45 | 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, | ||
46 | 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6, | ||
47 | 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, | ||
48 | 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, | ||
49 | 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, | ||
50 | 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7 | ||
51 | }; | ||
52 | |||
53 | const uint8_t av_reverse[256]={ | ||
54 | 0x00,0x80,0x40,0xC0,0x20,0xA0,0x60,0xE0,0x10,0x90,0x50,0xD0,0x30,0xB0,0x70,0xF0, | ||
55 | 0x08,0x88,0x48,0xC8,0x28,0xA8,0x68,0xE8,0x18,0x98,0x58,0xD8,0x38,0xB8,0x78,0xF8, | ||
56 | 0x04,0x84,0x44,0xC4,0x24,0xA4,0x64,0xE4,0x14,0x94,0x54,0xD4,0x34,0xB4,0x74,0xF4, | ||
57 | 0x0C,0x8C,0x4C,0xCC,0x2C,0xAC,0x6C,0xEC,0x1C,0x9C,0x5C,0xDC,0x3C,0xBC,0x7C,0xFC, | ||
58 | 0x02,0x82,0x42,0xC2,0x22,0xA2,0x62,0xE2,0x12,0x92,0x52,0xD2,0x32,0xB2,0x72,0xF2, | ||
59 | 0x0A,0x8A,0x4A,0xCA,0x2A,0xAA,0x6A,0xEA,0x1A,0x9A,0x5A,0xDA,0x3A,0xBA,0x7A,0xFA, | ||
60 | 0x06,0x86,0x46,0xC6,0x26,0xA6,0x66,0xE6,0x16,0x96,0x56,0xD6,0x36,0xB6,0x76,0xF6, | ||
61 | 0x0E,0x8E,0x4E,0xCE,0x2E,0xAE,0x6E,0xEE,0x1E,0x9E,0x5E,0xDE,0x3E,0xBE,0x7E,0xFE, | ||
62 | 0x01,0x81,0x41,0xC1,0x21,0xA1,0x61,0xE1,0x11,0x91,0x51,0xD1,0x31,0xB1,0x71,0xF1, | ||
63 | 0x09,0x89,0x49,0xC9,0x29,0xA9,0x69,0xE9,0x19,0x99,0x59,0xD9,0x39,0xB9,0x79,0xF9, | ||
64 | 0x05,0x85,0x45,0xC5,0x25,0xA5,0x65,0xE5,0x15,0x95,0x55,0xD5,0x35,0xB5,0x75,0xF5, | ||
65 | 0x0D,0x8D,0x4D,0xCD,0x2D,0xAD,0x6D,0xED,0x1D,0x9D,0x5D,0xDD,0x3D,0xBD,0x7D,0xFD, | ||
66 | 0x03,0x83,0x43,0xC3,0x23,0xA3,0x63,0xE3,0x13,0x93,0x53,0xD3,0x33,0xB3,0x73,0xF3, | ||
67 | 0x0B,0x8B,0x4B,0xCB,0x2B,0xAB,0x6B,0xEB,0x1B,0x9B,0x5B,0xDB,0x3B,0xBB,0x7B,0xFB, | ||
68 | 0x07,0x87,0x47,0xC7,0x27,0xA7,0x67,0xE7,0x17,0x97,0x57,0xD7,0x37,0xB7,0x77,0xF7, | ||
69 | 0x0F,0x8F,0x4F,0xCF,0x2F,0xAF,0x6F,0xEF,0x1F,0x9F,0x5F,0xDF,0x3F,0xBF,0x7F,0xFF, | ||
70 | }; | ||
71 | |||
72 | int64_t av_gcd(int64_t a, int64_t b){ | ||
73 | if(b) return av_gcd(b, a%b); | ||
74 | else return a; | ||
75 | } | ||
76 | |||
77 | int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd){ | ||
78 | int64_t r=0; | ||
79 | assert(c > 0); | ||
80 | assert(b >=0); | ||
81 | assert((unsigned)rnd<=5 && rnd!=4); | ||
82 | |||
83 | if(a<0 && a != INT64_MIN) return -av_rescale_rnd(-a, b, c, rnd ^ ((rnd>>1)&1)); | ||
84 | |||
85 | if(rnd==AV_ROUND_NEAR_INF) r= c/2; | ||
86 | else if(rnd&1) r= c-1; | ||
87 | |||
88 | if(b<=INT_MAX && c<=INT_MAX){ | ||
89 | if(a<=INT_MAX) | ||
90 | return (a * b + r)/c; | ||
91 | else | ||
92 | return a/c*b + (a%c*b + r)/c; | ||
93 | }else{ | ||
94 | #if 1 | ||
95 | uint64_t a0= a&0xFFFFFFFF; | ||
96 | uint64_t a1= a>>32; | ||
97 | uint64_t b0= b&0xFFFFFFFF; | ||
98 | uint64_t b1= b>>32; | ||
99 | uint64_t t1= a0*b1 + a1*b0; | ||
100 | uint64_t t1a= t1<<32; | ||
101 | int i; | ||
102 | |||
103 | a0 = a0*b0 + t1a; | ||
104 | a1 = a1*b1 + (t1>>32) + (a0<t1a); | ||
105 | a0 += r; | ||
106 | a1 += a0<r; | ||
107 | |||
108 | for(i=63; i>=0; i--){ | ||
109 | // int o= a1 & 0x8000000000000000ULL; | ||
110 | a1+= a1 + ((a0>>i)&1); | ||
111 | t1+=t1; | ||
112 | if(/*o || */c <= a1){ | ||
113 | a1 -= c; | ||
114 | t1++; | ||
115 | } | ||
116 | } | ||
117 | return t1; | ||
118 | } | ||
119 | #else | ||
120 | AVInteger ai; | ||
121 | ai= av_mul_i(av_int2i(a), av_int2i(b)); | ||
122 | ai= av_add_i(ai, av_int2i(r)); | ||
123 | |||
124 | return av_i2int(av_div_i(ai, av_int2i(c))); | ||
125 | } | ||
126 | #endif | ||
127 | } | ||
128 | |||
129 | int64_t av_rescale(int64_t a, int64_t b, int64_t c){ | ||
130 | return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF); | ||
131 | } | ||
132 | |||
133 | #if 0 | ||
134 | int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq){ | ||
135 | int64_t b= bq.num * (int64_t)cq.den; | ||
136 | int64_t c= cq.num * (int64_t)bq.den; | ||
137 | return av_rescale_rnd(a, b, c, AV_ROUND_NEAR_INF); | ||
138 | } | ||
139 | |||
140 | int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b){ | ||
141 | int64_t a= tb_a.num * (int64_t)tb_b.den; | ||
142 | int64_t b= tb_b.num * (int64_t)tb_a.den; | ||
143 | if (av_rescale_rnd(ts_a, a, b, AV_ROUND_DOWN) < ts_b) return -1; | ||
144 | if (av_rescale_rnd(ts_b, b, a, AV_ROUND_DOWN) < ts_a) return 1; | ||
145 | return 0; | ||
146 | } | ||
147 | #endif | ||
148 | |||
149 | int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod){ | ||
150 | int64_t c= (a-b) & (mod-1); | ||
151 | if(c > (mod>>1)) | ||
152 | c-= mod; | ||
153 | return c; | ||
154 | } | ||
155 | |||
156 | #ifdef TEST | ||
157 | #include "integer.h" | ||
158 | #undef printf | ||
159 | int main(void){ | ||
160 | int64_t a,b,c,d,e; | ||
161 | |||
162 | for(a=7; a<(1LL<<62); a+=a/3+1){ | ||
163 | for(b=3; b<(1LL<<62); b+=b/4+1){ | ||
164 | for(c=9; c<(1LL<<62); c+=(c*2)/5+3){ | ||
165 | int64_t r= c/2; | ||
166 | AVInteger ai; | ||
167 | ai= av_mul_i(av_int2i(a), av_int2i(b)); | ||
168 | ai= av_add_i(ai, av_int2i(r)); | ||
169 | |||
170 | d= av_i2int(av_div_i(ai, av_int2i(c))); | ||
171 | |||
172 | e= av_rescale(a,b,c); | ||
173 | |||
174 | if((double)a * (double)b / (double)c > (1LL<<63)) | ||
175 | continue; | ||
176 | |||
177 | if(d!=e) printf("%"PRId64"*%"PRId64"/%"PRId64"= %"PRId64"=%"PRId64"\n", a, b, c, d, e); | ||
178 | } | ||
179 | } | ||
180 | } | ||
181 | return 0; | ||
182 | } | ||
183 | #endif | ||