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| 1 : | edgomez | 1.2 | /* |
| 2 : | * Simple IDCT | ||
| 3 : | * | ||
| 4 : | * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> | ||
| 5 : | * | ||
| 6 : | * This library 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 of the License, or (at your option) any later version. | ||
| 10 : | * | ||
| 11 : | * This library 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 this library; if not, write to the Free Software | ||
| 18 : | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| 19 : | */ | ||
| 20 : | /* | ||
| 21 : | based upon some outcommented c code from mpeg2dec (idct_mmx.c | ||
| 22 : | written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>) | ||
| 23 : | */ | ||
| 24 : | #include "../portab.h" | ||
| 25 : | #include "idct.h" | ||
| 26 : | |||
| 27 : | #if 0 | ||
| 28 : | #define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */ | ||
| 29 : | #define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */ | ||
| 30 : | #define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */ | ||
| 31 : | #define W4 2048 /* 2048*sqrt (2)*cos (4*pi/16) */ | ||
| 32 : | #define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */ | ||
| 33 : | #define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */ | ||
| 34 : | #define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */ | ||
| 35 : | #define ROW_SHIFT 8 | ||
| 36 : | #define COL_SHIFT 17 | ||
| 37 : | #else | ||
| 38 : | #define W1 22725 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 39 : | #define W2 21407 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 40 : | #define W3 19266 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 41 : | #define W4 16383 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 42 : | #define W5 12873 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 43 : | #define W6 8867 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 44 : | #define W7 4520 //cos(i*M_PI/16)*sqrt(2)*(1<<14) + 0.5 | ||
| 45 : | #define ROW_SHIFT 11 | ||
| 46 : | #define COL_SHIFT 20 // 6 | ||
| 47 : | #endif | ||
| 48 : | |||
| 49 : | #if defined(ARCH_IS_PPC) | ||
| 50 : | |||
| 51 : | /* signed 16x16 -> 32 multiply add accumulate */ | ||
| 52 : | #define MAC16(rt, ra, rb) \ | ||
| 53 : | asm ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb)); | ||
| 54 : | |||
| 55 : | /* signed 16x16 -> 32 multiply */ | ||
| 56 : | #define MUL16(rt, ra, rb) \ | ||
| 57 : | asm ("mullhw %0, %1, %2" : "=r" (rt) : "r" (ra), "r" (rb)); | ||
| 58 : | |||
| 59 : | #else | ||
| 60 : | |||
| 61 : | /* signed 16x16 -> 32 multiply add accumulate */ | ||
| 62 : | #define MAC16(rt, ra, rb) rt += (ra) * (rb) | ||
| 63 : | |||
| 64 : | /* signed 16x16 -> 32 multiply */ | ||
| 65 : | #define MUL16(rt, ra, rb) rt = (ra) * (rb) | ||
| 66 : | |||
| 67 : | #endif | ||
| 68 : | |||
| 69 : | static __inline void idctRowCondDC (int16_t * const row) | ||
| 70 : | { | ||
| 71 : | int a0, a1, a2, a3, b0, b1, b2, b3; | ||
| 72 : | #ifdef FAST_64BIT | ||
| 73 : | uint64_t temp; | ||
| 74 : | #else | ||
| 75 : | uint32_t temp; | ||
| 76 : | #endif | ||
| 77 : | |||
| 78 : | #ifdef FAST_64BIT | ||
| 79 : | #ifdef ARCH_IS_BIG_ENDIAN | ||
| 80 : | #define ROW0_MASK 0xffff000000000000LL | ||
| 81 : | #else | ||
| 82 : | #define ROW0_MASK 0xffffLL | ||
| 83 : | #endif | ||
| 84 : | if ( ((((uint64_t *)row)[0] & ~ROW0_MASK) | | ||
| 85 : | ((uint64_t *)row)[1]) == 0) { | ||
| 86 : | temp = (row[0] << 3) & 0xffff; | ||
| 87 : | temp += temp << 16; | ||
| 88 : | temp += temp << 32; | ||
| 89 : | ((uint64_t *)row)[0] = temp; | ||
| 90 : | ((uint64_t *)row)[1] = temp; | ||
| 91 : | return; | ||
| 92 : | } | ||
| 93 : | #else | ||
| 94 : | if (!(((uint32_t*)row)[1] | | ||
| 95 : | ((uint32_t*)row)[2] | | ||
| 96 : | ((uint32_t*)row)[3] | | ||
| 97 : | row[1])) { | ||
| 98 : | temp = (row[0] << 3) & 0xffff; | ||
| 99 : | temp += temp << 16; | ||
| 100 : | ((uint32_t*)row)[0]=((uint32_t*)row)[1] = | ||
| 101 : | ((uint32_t*)row)[2]=((uint32_t*)row)[3] = temp; | ||
| 102 : | return; | ||
| 103 : | } | ||
| 104 : | #endif | ||
| 105 : | |||
| 106 : | a0 = (W4 * row[0]) + (1 << (ROW_SHIFT - 1)); | ||
| 107 : | a1 = a0; | ||
| 108 : | a2 = a0; | ||
| 109 : | a3 = a0; | ||
| 110 : | |||
| 111 : | /* no need to optimize : gcc does it */ | ||
| 112 : | a0 += W2 * row[2]; | ||
| 113 : | a1 += W6 * row[2]; | ||
| 114 : | a2 -= W6 * row[2]; | ||
| 115 : | a3 -= W2 * row[2]; | ||
| 116 : | |||
| 117 : | MUL16(b0, W1, row[1]); | ||
| 118 : | MAC16(b0, W3, row[3]); | ||
| 119 : | MUL16(b1, W3, row[1]); | ||
| 120 : | MAC16(b1, -W7, row[3]); | ||
| 121 : | MUL16(b2, W5, row[1]); | ||
| 122 : | MAC16(b2, -W1, row[3]); | ||
| 123 : | MUL16(b3, W7, row[1]); | ||
| 124 : | MAC16(b3, -W5, row[3]); | ||
| 125 : | |||
| 126 : | #ifdef FAST_64BIT | ||
| 127 : | temp = ((uint64_t*)row)[1]; | ||
| 128 : | #else | ||
| 129 : | temp = ((uint32_t*)row)[2] | ((uint32_t*)row)[3]; | ||
| 130 : | #endif | ||
| 131 : | if (temp != 0) { | ||
| 132 : | a0 += W4*row[4] + W6*row[6]; | ||
| 133 : | a1 += - W4*row[4] - W2*row[6]; | ||
| 134 : | a2 += - W4*row[4] + W2*row[6]; | ||
| 135 : | a3 += W4*row[4] - W6*row[6]; | ||
| 136 : | |||
| 137 : | MAC16(b0, W5, row[5]); | ||
| 138 : | MAC16(b0, W7, row[7]); | ||
| 139 : | |||
| 140 : | MAC16(b1, -W1, row[5]); | ||
| 141 : | MAC16(b1, -W5, row[7]); | ||
| 142 : | |||
| 143 : | MAC16(b2, W7, row[5]); | ||
| 144 : | MAC16(b2, W3, row[7]); | ||
| 145 : | |||
| 146 : | MAC16(b3, W3, row[5]); | ||
| 147 : | MAC16(b3, -W1, row[7]); | ||
| 148 : | } | ||
| 149 : | |||
| 150 : | row[0] = (a0 + b0) >> ROW_SHIFT; | ||
| 151 : | row[7] = (a0 - b0) >> ROW_SHIFT; | ||
| 152 : | row[1] = (a1 + b1) >> ROW_SHIFT; | ||
| 153 : | row[6] = (a1 - b1) >> ROW_SHIFT; | ||
| 154 : | row[2] = (a2 + b2) >> ROW_SHIFT; | ||
| 155 : | row[5] = (a2 - b2) >> ROW_SHIFT; | ||
| 156 : | row[3] = (a3 + b3) >> ROW_SHIFT; | ||
| 157 : | row[4] = (a3 - b3) >> ROW_SHIFT; | ||
| 158 : | } | ||
| 159 : | |||
| 160 : | |||
| 161 : | static __inline void idctSparseCol (int16_t * const col) | ||
| 162 : | { | ||
| 163 : | int a0, a1, a2, a3, b0, b1, b2, b3; | ||
| 164 : | |||
| 165 : | /* XXX: I did that only to give same values as previous code */ | ||
| 166 : | a0 = W4 * (col[8*0] + ((1<<(COL_SHIFT-1))/W4)); | ||
| 167 : | a1 = a0; | ||
| 168 : | a2 = a0; | ||
| 169 : | a3 = a0; | ||
| 170 : | |||
| 171 : | a0 += + W2*col[8*2]; | ||
| 172 : | a1 += + W6*col[8*2]; | ||
| 173 : | a2 += - W6*col[8*2]; | ||
| 174 : | a3 += - W2*col[8*2]; | ||
| 175 : | |||
| 176 : | MUL16(b0, W1, col[8*1]); | ||
| 177 : | MUL16(b1, W3, col[8*1]); | ||
| 178 : | MUL16(b2, W5, col[8*1]); | ||
| 179 : | MUL16(b3, W7, col[8*1]); | ||
| 180 : | |||
| 181 : | MAC16(b0, + W3, col[8*3]); | ||
| 182 : | MAC16(b1, - W7, col[8*3]); | ||
| 183 : | MAC16(b2, - W1, col[8*3]); | ||
| 184 : | MAC16(b3, - W5, col[8*3]); | ||
| 185 : | |||
| 186 : | if(col[8*4]){ | ||
| 187 : | a0 += + W4*col[8*4]; | ||
| 188 : | a1 += - W4*col[8*4]; | ||
| 189 : | a2 += - W4*col[8*4]; | ||
| 190 : | a3 += + W4*col[8*4]; | ||
| 191 : | } | ||
| 192 : | |||
| 193 : | if (col[8*5]) { | ||
| 194 : | MAC16(b0, + W5, col[8*5]); | ||
| 195 : | MAC16(b1, - W1, col[8*5]); | ||
| 196 : | MAC16(b2, + W7, col[8*5]); | ||
| 197 : | MAC16(b3, + W3, col[8*5]); | ||
| 198 : | } | ||
| 199 : | |||
| 200 : | if(col[8*6]){ | ||
| 201 : | a0 += + W6*col[8*6]; | ||
| 202 : | a1 += - W2*col[8*6]; | ||
| 203 : | a2 += + W2*col[8*6]; | ||
| 204 : | a3 += - W6*col[8*6]; | ||
| 205 : | } | ||
| 206 : | |||
| 207 : | if (col[8*7]) { | ||
| 208 : | MAC16(b0, + W7, col[8*7]); | ||
| 209 : | MAC16(b1, - W5, col[8*7]); | ||
| 210 : | MAC16(b2, + W3, col[8*7]); | ||
| 211 : | MAC16(b3, - W1, col[8*7]); | ||
| 212 : | } | ||
| 213 : | |||
| 214 : | col[0 ] = ((a0 + b0) >> COL_SHIFT); | ||
| 215 : | col[8 ] = ((a1 + b1) >> COL_SHIFT); | ||
| 216 : | col[16] = ((a2 + b2) >> COL_SHIFT); | ||
| 217 : | col[24] = ((a3 + b3) >> COL_SHIFT); | ||
| 218 : | col[32] = ((a3 - b3) >> COL_SHIFT); | ||
| 219 : | col[40] = ((a2 - b2) >> COL_SHIFT); | ||
| 220 : | col[48] = ((a1 - b1) >> COL_SHIFT); | ||
| 221 : | col[56] = ((a0 - b0) >> COL_SHIFT); | ||
| 222 : | } | ||
| 223 : | |||
| 224 : | void simple_idct_c(int16_t * const block) | ||
| 225 : | { | ||
| 226 : | int i; | ||
| 227 : | for(i=0; i<8; i++) | ||
| 228 : | idctRowCondDC(block + i*8); | ||
| 229 : | |||
| 230 : | for(i=0; i<8; i++) | ||
| 231 : | idctSparseCol(block + i); | ||
| 232 : | } | ||
| 233 : | |||
| 234 : | |||
| 235 : | /* Input permutation for the simple_idct_mmx */ | ||
| 236 : | static const uint8_t simple_mmx_permutation[64]={ | ||
| 237 : | 0x00, 0x08, 0x04, 0x09, 0x01, 0x0C, 0x05, 0x0D, | ||
| 238 : | 0x10, 0x18, 0x14, 0x19, 0x11, 0x1C, 0x15, 0x1D, | ||
| 239 : | 0x20, 0x28, 0x24, 0x29, 0x21, 0x2C, 0x25, 0x2D, | ||
| 240 : | 0x12, 0x1A, 0x16, 0x1B, 0x13, 0x1E, 0x17, 0x1F, | ||
| 241 : | 0x02, 0x0A, 0x06, 0x0B, 0x03, 0x0E, 0x07, 0x0F, | ||
| 242 : | 0x30, 0x38, 0x34, 0x39, 0x31, 0x3C, 0x35, 0x3D, | ||
| 243 : | 0x22, 0x2A, 0x26, 0x2B, 0x23, 0x2E, 0x27, 0x2F, | ||
| 244 : | 0x32, 0x3A, 0x36, 0x3B, 0x33, 0x3E, 0x37, 0x3F, | ||
| 245 : | }; | ||
| 246 : | |||
| 247 : | #if defined(ARCH_IS_IA32) | ||
| 248 : | /* wrapper function, as simple_idct_mmx expects data to be permutated */ | ||
| 249 : | void simple_idct_mmx2(int16_t * const block) | ||
| 250 : | { | ||
| 251 : | int16_t tmp[64]; | ||
| 252 : | int i; | ||
| 253 : | |||
| 254 : | for(i=0;i<64;i++) tmp[simple_mmx_permutation[i]] = block[i]; | ||
| 255 : | simple_idct_mmx(tmp); | ||
| 256 : | for(i=0;i<64;i++) block[i] = tmp[i]; | ||
| 257 : | } | ||
| 258 : | #endif |
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