/* * Copyright (c) 2001 Michel Lespinasse * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* * NOTE: This code is based on GPL code from the libmpeg2 project. The * author, Michel Lespinasses, has given explicit permission to release * under LGPL as part of FFmpeg. */ /* * FFmpeg integration by Dieter Shirley * * This file is a direct copy of the AltiVec IDCT module from the libmpeg2 * project. I've deleted all of the libmpeg2-specific code, renamed the * functions and reordered the function parameters. The only change to the * IDCT function itself was to factor out the partial transposition, and to * perform a full transpose at the end of the function. */ #include <stdlib.h> /* malloc(), free() */ #include <string.h> #include "config.h" #if HAVE_ALTIVEC_H #include <altivec.h> #endif #include "libavutil/ppc/types_altivec.h" #include "dsputil_altivec.h" #define IDCT_HALF \ /* 1st stage */ \ t1 = vec_mradds (a1, vx7, vx1 ); \ t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \ t7 = vec_mradds (a2, vx5, vx3); \ t3 = vec_mradds (ma2, vx3, vx5); \ \ /* 2nd stage */ \ t5 = vec_adds (vx0, vx4); \ t0 = vec_subs (vx0, vx4); \ t2 = vec_mradds (a0, vx6, vx2); \ t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \ t6 = vec_adds (t8, t3); \ t3 = vec_subs (t8, t3); \ t8 = vec_subs (t1, t7); \ t1 = vec_adds (t1, t7); \ \ /* 3rd stage */ \ t7 = vec_adds (t5, t2); \ t2 = vec_subs (t5, t2); \ t5 = vec_adds (t0, t4); \ t0 = vec_subs (t0, t4); \ t4 = vec_subs (t8, t3); \ t3 = vec_adds (t8, t3); \ \ /* 4th stage */ \ vy0 = vec_adds (t7, t1); \ vy7 = vec_subs (t7, t1); \ vy1 = vec_mradds (c4, t3, t5); \ vy6 = vec_mradds (mc4, t3, t5); \ vy2 = vec_mradds (c4, t4, t0); \ vy5 = vec_mradds (mc4, t4, t0); \ vy3 = vec_adds (t2, t6); \ vy4 = vec_subs (t2, t6); #define IDCT \ vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \ vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias; \ vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ vec_u16 shift; \ \ c4 = vec_splat (constants[0], 0); \ a0 = vec_splat (constants[0], 1); \ a1 = vec_splat (constants[0], 2); \ a2 = vec_splat (constants[0], 3); \ mc4 = vec_splat (constants[0], 4); \ ma2 = vec_splat (constants[0], 5); \ bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3); \ \ zero = vec_splat_s16 (0); \ shift = vec_splat_u16 (4); \ \ vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \ vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \ vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \ vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \ vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \ vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \ vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \ vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \ \ IDCT_HALF \ \ vx0 = vec_mergeh (vy0, vy4); \ vx1 = vec_mergel (vy0, vy4); \ vx2 = vec_mergeh (vy1, vy5); \ vx3 = vec_mergel (vy1, vy5); \ vx4 = vec_mergeh (vy2, vy6); \ vx5 = vec_mergel (vy2, vy6); \ vx6 = vec_mergeh (vy3, vy7); \ vx7 = vec_mergel (vy3, vy7); \ \ vy0 = vec_mergeh (vx0, vx4); \ vy1 = vec_mergel (vx0, vx4); \ vy2 = vec_mergeh (vx1, vx5); \ vy3 = vec_mergel (vx1, vx5); \ vy4 = vec_mergeh (vx2, vx6); \ vy5 = vec_mergel (vx2, vx6); \ vy6 = vec_mergeh (vx3, vx7); \ vy7 = vec_mergel (vx3, vx7); \ \ vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \ vx1 = vec_mergel (vy0, vy4); \ vx2 = vec_mergeh (vy1, vy5); \ vx3 = vec_mergel (vy1, vy5); \ vx4 = vec_mergeh (vy2, vy6); \ vx5 = vec_mergel (vy2, vy6); \ vx6 = vec_mergeh (vy3, vy7); \ vx7 = vec_mergel (vy3, vy7); \ \ IDCT_HALF \ \ shift = vec_splat_u16 (6); \ vx0 = vec_sra (vy0, shift); \ vx1 = vec_sra (vy1, shift); \ vx2 = vec_sra (vy2, shift); \ vx3 = vec_sra (vy3, shift); \ vx4 = vec_sra (vy4, shift); \ vx5 = vec_sra (vy5, shift); \ vx6 = vec_sra (vy6, shift); \ vx7 = vec_sra (vy7, shift); static const vec_s16 constants[5] = { {23170, 13573, 6518, 21895, -23170, -21895, 32, 31}, {16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725}, {22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521}, {21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692}, {19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722} }; void ff_idct_put_altivec(uint8_t* dest, int stride, int16_t *blk) { vec_s16 *block = (vec_s16*)blk; vec_u8 tmp; IDCT #define COPY(dest,src) \ tmp = vec_packsu (src, src); \ vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); COPY (dest, vx0) dest += stride; COPY (dest, vx1) dest += stride; COPY (dest, vx2) dest += stride; COPY (dest, vx3) dest += stride; COPY (dest, vx4) dest += stride; COPY (dest, vx5) dest += stride; COPY (dest, vx6) dest += stride; COPY (dest, vx7) } void ff_idct_add_altivec(uint8_t* dest, int stride, int16_t *blk) { vec_s16 *block = (vec_s16*)blk; vec_u8 tmp; vec_s16 tmp2, tmp3; vec_u8 perm0; vec_u8 perm1; vec_u8 p0, p1, p; IDCT p0 = vec_lvsl (0, dest); p1 = vec_lvsl (stride, dest); p = vec_splat_u8 (-1); perm0 = vec_mergeh (p, p0); perm1 = vec_mergeh (p, p1); #define ADD(dest,src,perm) \ /* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \ tmp = vec_ld (0, dest); \ tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm); \ tmp3 = vec_adds (tmp2, src); \ tmp = vec_packsu (tmp3, tmp3); \ vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); ADD (dest, vx0, perm0) dest += stride; ADD (dest, vx1, perm1) dest += stride; ADD (dest, vx2, perm0) dest += stride; ADD (dest, vx3, perm1) dest += stride; ADD (dest, vx4, perm0) dest += stride; ADD (dest, vx5, perm1) dest += stride; ADD (dest, vx6, perm0) dest += stride; ADD (dest, vx7, perm1) }