1/* 2 * Copyright (c) 2001 Michel Lespinasse 3 * 4 * This file is part of Libav. 5 * 6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21/* 22 * NOTE: This code is based on GPL code from the libmpeg2 project. The 23 * author, Michel Lespinasses, has given explicit permission to release 24 * under LGPL as part of Libav. 25 */ 26 27/* 28 * Libav integration by Dieter Shirley 29 * 30 * This file is a direct copy of the AltiVec IDCT module from the libmpeg2 31 * project. I've deleted all of the libmpeg2-specific code, renamed the 32 * functions and reordered the function parameters. The only change to the 33 * IDCT function itself was to factor out the partial transposition, and to 34 * perform a full transpose at the end of the function. 35 */ 36 37 38#include <stdlib.h> /* malloc(), free() */ 39#include <string.h> 40#include "config.h" 41#if HAVE_ALTIVEC_H 42#include <altivec.h> 43#endif 44#include "libavcodec/dsputil.h" 45#include "types_altivec.h" 46#include "dsputil_altivec.h" 47 48#define IDCT_HALF \ 49 /* 1st stage */ \ 50 t1 = vec_mradds (a1, vx7, vx1 ); \ 51 t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \ 52 t7 = vec_mradds (a2, vx5, vx3); \ 53 t3 = vec_mradds (ma2, vx3, vx5); \ 54 \ 55 /* 2nd stage */ \ 56 t5 = vec_adds (vx0, vx4); \ 57 t0 = vec_subs (vx0, vx4); \ 58 t2 = vec_mradds (a0, vx6, vx2); \ 59 t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \ 60 t6 = vec_adds (t8, t3); \ 61 t3 = vec_subs (t8, t3); \ 62 t8 = vec_subs (t1, t7); \ 63 t1 = vec_adds (t1, t7); \ 64 \ 65 /* 3rd stage */ \ 66 t7 = vec_adds (t5, t2); \ 67 t2 = vec_subs (t5, t2); \ 68 t5 = vec_adds (t0, t4); \ 69 t0 = vec_subs (t0, t4); \ 70 t4 = vec_subs (t8, t3); \ 71 t3 = vec_adds (t8, t3); \ 72 \ 73 /* 4th stage */ \ 74 vy0 = vec_adds (t7, t1); \ 75 vy7 = vec_subs (t7, t1); \ 76 vy1 = vec_mradds (c4, t3, t5); \ 77 vy6 = vec_mradds (mc4, t3, t5); \ 78 vy2 = vec_mradds (c4, t4, t0); \ 79 vy5 = vec_mradds (mc4, t4, t0); \ 80 vy3 = vec_adds (t2, t6); \ 81 vy4 = vec_subs (t2, t6); 82 83 84#define IDCT \ 85 vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \ 86 vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ 87 vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias; \ 88 vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ 89 vec_u16 shift; \ 90 \ 91 c4 = vec_splat (constants[0], 0); \ 92 a0 = vec_splat (constants[0], 1); \ 93 a1 = vec_splat (constants[0], 2); \ 94 a2 = vec_splat (constants[0], 3); \ 95 mc4 = vec_splat (constants[0], 4); \ 96 ma2 = vec_splat (constants[0], 5); \ 97 bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3); \ 98 \ 99 zero = vec_splat_s16 (0); \ 100 shift = vec_splat_u16 (4); \ 101 \ 102 vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \ 103 vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \ 104 vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \ 105 vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \ 106 vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \ 107 vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \ 108 vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \ 109 vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \ 110 \ 111 IDCT_HALF \ 112 \ 113 vx0 = vec_mergeh (vy0, vy4); \ 114 vx1 = vec_mergel (vy0, vy4); \ 115 vx2 = vec_mergeh (vy1, vy5); \ 116 vx3 = vec_mergel (vy1, vy5); \ 117 vx4 = vec_mergeh (vy2, vy6); \ 118 vx5 = vec_mergel (vy2, vy6); \ 119 vx6 = vec_mergeh (vy3, vy7); \ 120 vx7 = vec_mergel (vy3, vy7); \ 121 \ 122 vy0 = vec_mergeh (vx0, vx4); \ 123 vy1 = vec_mergel (vx0, vx4); \ 124 vy2 = vec_mergeh (vx1, vx5); \ 125 vy3 = vec_mergel (vx1, vx5); \ 126 vy4 = vec_mergeh (vx2, vx6); \ 127 vy5 = vec_mergel (vx2, vx6); \ 128 vy6 = vec_mergeh (vx3, vx7); \ 129 vy7 = vec_mergel (vx3, vx7); \ 130 \ 131 vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \ 132 vx1 = vec_mergel (vy0, vy4); \ 133 vx2 = vec_mergeh (vy1, vy5); \ 134 vx3 = vec_mergel (vy1, vy5); \ 135 vx4 = vec_mergeh (vy2, vy6); \ 136 vx5 = vec_mergel (vy2, vy6); \ 137 vx6 = vec_mergeh (vy3, vy7); \ 138 vx7 = vec_mergel (vy3, vy7); \ 139 \ 140 IDCT_HALF \ 141 \ 142 shift = vec_splat_u16 (6); \ 143 vx0 = vec_sra (vy0, shift); \ 144 vx1 = vec_sra (vy1, shift); \ 145 vx2 = vec_sra (vy2, shift); \ 146 vx3 = vec_sra (vy3, shift); \ 147 vx4 = vec_sra (vy4, shift); \ 148 vx5 = vec_sra (vy5, shift); \ 149 vx6 = vec_sra (vy6, shift); \ 150 vx7 = vec_sra (vy7, shift); 151 152 153static const vec_s16 constants[5] = { 154 {23170, 13573, 6518, 21895, -23170, -21895, 32, 31}, 155 {16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725}, 156 {22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521}, 157 {21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692}, 158 {19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722} 159}; 160 161void idct_put_altivec(uint8_t* dest, int stride, int16_t *blk) 162{ 163 vec_s16 *block = (vec_s16*)blk; 164 vec_u8 tmp; 165 166 IDCT 167 168#define COPY(dest,src) \ 169 tmp = vec_packsu (src, src); \ 170 vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 171 vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 172 173 COPY (dest, vx0) dest += stride; 174 COPY (dest, vx1) dest += stride; 175 COPY (dest, vx2) dest += stride; 176 COPY (dest, vx3) dest += stride; 177 COPY (dest, vx4) dest += stride; 178 COPY (dest, vx5) dest += stride; 179 COPY (dest, vx6) dest += stride; 180 COPY (dest, vx7) 181} 182 183void idct_add_altivec(uint8_t* dest, int stride, int16_t *blk) 184{ 185 vec_s16 *block = (vec_s16*)blk; 186 vec_u8 tmp; 187 vec_s16 tmp2, tmp3; 188 vec_u8 perm0; 189 vec_u8 perm1; 190 vec_u8 p0, p1, p; 191 192 IDCT 193 194 p0 = vec_lvsl (0, dest); 195 p1 = vec_lvsl (stride, dest); 196 p = vec_splat_u8 (-1); 197 perm0 = vec_mergeh (p, p0); 198 perm1 = vec_mergeh (p, p1); 199 200#define ADD(dest,src,perm) \ 201 /* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \ 202 tmp = vec_ld (0, dest); \ 203 tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm); \ 204 tmp3 = vec_adds (tmp2, src); \ 205 tmp = vec_packsu (tmp3, tmp3); \ 206 vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 207 vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 208 209 ADD (dest, vx0, perm0) dest += stride; 210 ADD (dest, vx1, perm1) dest += stride; 211 ADD (dest, vx2, perm0) dest += stride; 212 ADD (dest, vx3, perm1) dest += stride; 213 ADD (dest, vx4, perm0) dest += stride; 214 ADD (dest, vx5, perm1) dest += stride; 215 ADD (dest, vx6, perm0) dest += stride; 216 ADD (dest, vx7, perm1) 217} 218 219