Libav 0.7.1
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00001 /* 00002 * Copyright (c) 2001 Michel Lespinasse 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00021 /* 00022 * NOTE: This code is based on GPL code from the libmpeg2 project. The 00023 * author, Michel Lespinasses, has given explicit permission to release 00024 * under LGPL as part of Libav. 00025 */ 00026 00027 /* 00028 * Libav integration by Dieter Shirley 00029 * 00030 * This file is a direct copy of the AltiVec IDCT module from the libmpeg2 00031 * project. I've deleted all of the libmpeg2-specific code, renamed the 00032 * functions and reordered the function parameters. The only change to the 00033 * IDCT function itself was to factor out the partial transposition, and to 00034 * perform a full transpose at the end of the function. 00035 */ 00036 00037 00038 #include <stdlib.h> /* malloc(), free() */ 00039 #include <string.h> 00040 #include "config.h" 00041 #if HAVE_ALTIVEC_H 00042 #include <altivec.h> 00043 #endif 00044 #include "libavcodec/dsputil.h" 00045 #include "types_altivec.h" 00046 #include "dsputil_altivec.h" 00047 00048 #define IDCT_HALF \ 00049 /* 1st stage */ \ 00050 t1 = vec_mradds (a1, vx7, vx1 ); \ 00051 t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \ 00052 t7 = vec_mradds (a2, vx5, vx3); \ 00053 t3 = vec_mradds (ma2, vx3, vx5); \ 00054 \ 00055 /* 2nd stage */ \ 00056 t5 = vec_adds (vx0, vx4); \ 00057 t0 = vec_subs (vx0, vx4); \ 00058 t2 = vec_mradds (a0, vx6, vx2); \ 00059 t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \ 00060 t6 = vec_adds (t8, t3); \ 00061 t3 = vec_subs (t8, t3); \ 00062 t8 = vec_subs (t1, t7); \ 00063 t1 = vec_adds (t1, t7); \ 00064 \ 00065 /* 3rd stage */ \ 00066 t7 = vec_adds (t5, t2); \ 00067 t2 = vec_subs (t5, t2); \ 00068 t5 = vec_adds (t0, t4); \ 00069 t0 = vec_subs (t0, t4); \ 00070 t4 = vec_subs (t8, t3); \ 00071 t3 = vec_adds (t8, t3); \ 00072 \ 00073 /* 4th stage */ \ 00074 vy0 = vec_adds (t7, t1); \ 00075 vy7 = vec_subs (t7, t1); \ 00076 vy1 = vec_mradds (c4, t3, t5); \ 00077 vy6 = vec_mradds (mc4, t3, t5); \ 00078 vy2 = vec_mradds (c4, t4, t0); \ 00079 vy5 = vec_mradds (mc4, t4, t0); \ 00080 vy3 = vec_adds (t2, t6); \ 00081 vy4 = vec_subs (t2, t6); 00082 00083 00084 #define IDCT \ 00085 vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \ 00086 vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ 00087 vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias; \ 00088 vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ 00089 vec_u16 shift; \ 00090 \ 00091 c4 = vec_splat (constants[0], 0); \ 00092 a0 = vec_splat (constants[0], 1); \ 00093 a1 = vec_splat (constants[0], 2); \ 00094 a2 = vec_splat (constants[0], 3); \ 00095 mc4 = vec_splat (constants[0], 4); \ 00096 ma2 = vec_splat (constants[0], 5); \ 00097 bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3); \ 00098 \ 00099 zero = vec_splat_s16 (0); \ 00100 shift = vec_splat_u16 (4); \ 00101 \ 00102 vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \ 00103 vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \ 00104 vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \ 00105 vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \ 00106 vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \ 00107 vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \ 00108 vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \ 00109 vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \ 00110 \ 00111 IDCT_HALF \ 00112 \ 00113 vx0 = vec_mergeh (vy0, vy4); \ 00114 vx1 = vec_mergel (vy0, vy4); \ 00115 vx2 = vec_mergeh (vy1, vy5); \ 00116 vx3 = vec_mergel (vy1, vy5); \ 00117 vx4 = vec_mergeh (vy2, vy6); \ 00118 vx5 = vec_mergel (vy2, vy6); \ 00119 vx6 = vec_mergeh (vy3, vy7); \ 00120 vx7 = vec_mergel (vy3, vy7); \ 00121 \ 00122 vy0 = vec_mergeh (vx0, vx4); \ 00123 vy1 = vec_mergel (vx0, vx4); \ 00124 vy2 = vec_mergeh (vx1, vx5); \ 00125 vy3 = vec_mergel (vx1, vx5); \ 00126 vy4 = vec_mergeh (vx2, vx6); \ 00127 vy5 = vec_mergel (vx2, vx6); \ 00128 vy6 = vec_mergeh (vx3, vx7); \ 00129 vy7 = vec_mergel (vx3, vx7); \ 00130 \ 00131 vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \ 00132 vx1 = vec_mergel (vy0, vy4); \ 00133 vx2 = vec_mergeh (vy1, vy5); \ 00134 vx3 = vec_mergel (vy1, vy5); \ 00135 vx4 = vec_mergeh (vy2, vy6); \ 00136 vx5 = vec_mergel (vy2, vy6); \ 00137 vx6 = vec_mergeh (vy3, vy7); \ 00138 vx7 = vec_mergel (vy3, vy7); \ 00139 \ 00140 IDCT_HALF \ 00141 \ 00142 shift = vec_splat_u16 (6); \ 00143 vx0 = vec_sra (vy0, shift); \ 00144 vx1 = vec_sra (vy1, shift); \ 00145 vx2 = vec_sra (vy2, shift); \ 00146 vx3 = vec_sra (vy3, shift); \ 00147 vx4 = vec_sra (vy4, shift); \ 00148 vx5 = vec_sra (vy5, shift); \ 00149 vx6 = vec_sra (vy6, shift); \ 00150 vx7 = vec_sra (vy7, shift); 00151 00152 00153 static const vec_s16 constants[5] = { 00154 {23170, 13573, 6518, 21895, -23170, -21895, 32, 31}, 00155 {16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725}, 00156 {22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521}, 00157 {21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692}, 00158 {19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722} 00159 }; 00160 00161 void idct_put_altivec(uint8_t* dest, int stride, int16_t *blk) 00162 { 00163 vec_s16 *block = (vec_s16*)blk; 00164 vec_u8 tmp; 00165 00166 IDCT 00167 00168 #define COPY(dest,src) \ 00169 tmp = vec_packsu (src, src); \ 00170 vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 00171 vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 00172 00173 COPY (dest, vx0) dest += stride; 00174 COPY (dest, vx1) dest += stride; 00175 COPY (dest, vx2) dest += stride; 00176 COPY (dest, vx3) dest += stride; 00177 COPY (dest, vx4) dest += stride; 00178 COPY (dest, vx5) dest += stride; 00179 COPY (dest, vx6) dest += stride; 00180 COPY (dest, vx7) 00181 } 00182 00183 void idct_add_altivec(uint8_t* dest, int stride, int16_t *blk) 00184 { 00185 vec_s16 *block = (vec_s16*)blk; 00186 vec_u8 tmp; 00187 vec_s16 tmp2, tmp3; 00188 vec_u8 perm0; 00189 vec_u8 perm1; 00190 vec_u8 p0, p1, p; 00191 00192 IDCT 00193 00194 p0 = vec_lvsl (0, dest); 00195 p1 = vec_lvsl (stride, dest); 00196 p = vec_splat_u8 (-1); 00197 perm0 = vec_mergeh (p, p0); 00198 perm1 = vec_mergeh (p, p1); 00199 00200 #define ADD(dest,src,perm) \ 00201 /* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \ 00202 tmp = vec_ld (0, dest); \ 00203 tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm); \ 00204 tmp3 = vec_adds (tmp2, src); \ 00205 tmp = vec_packsu (tmp3, tmp3); \ 00206 vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 00207 vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 00208 00209 ADD (dest, vx0, perm0) dest += stride; 00210 ADD (dest, vx1, perm1) dest += stride; 00211 ADD (dest, vx2, perm0) dest += stride; 00212 ADD (dest, vx3, perm1) dest += stride; 00213 ADD (dest, vx4, perm0) dest += stride; 00214 ADD (dest, vx5, perm1) dest += stride; 00215 ADD (dest, vx6, perm0) dest += stride; 00216 ADD (dest, vx7, perm1) 00217 } 00218