/* * Copyright (c) 2001 Michel Lespinasse * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 Libav. * * Libav 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 #include #include "config.h" #if HAVE_ALTIVEC_H #include #endif #include "libavutil/attributes.h" #include "libavutil/cpu.h" #include "libavutil/ppc/cpu.h" #include "libavutil/ppc/types_altivec.h" #include "libavcodec/idctdsp.h" #if HAVE_ALTIVEC #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 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ \ vec_s16 c4 = vec_splat(constants[0], 0); \ vec_s16 a0 = vec_splat(constants[0], 1); \ vec_s16 a1 = vec_splat(constants[0], 2); \ vec_s16 a2 = vec_splat(constants[0], 3); \ vec_s16 mc4 = vec_splat(constants[0], 4); \ vec_s16 ma2 = vec_splat(constants[0], 5); \ vec_s16 bias = (vec_s16) vec_splat((vec_s32) constants[0], 3); \ \ vec_s16 zero = vec_splat_s16(0); \ vec_u16 shift = vec_splat_u16(4); \ \ vec_s16 vx0 = vec_mradds(vec_sl(block[0], shift), constants[1], zero); \ vec_s16 vx1 = vec_mradds(vec_sl(block[1], shift), constants[2], zero); \ vec_s16 vx2 = vec_mradds(vec_sl(block[2], shift), constants[3], zero); \ vec_s16 vx3 = vec_mradds(vec_sl(block[3], shift), constants[4], zero); \ vec_s16 vx4 = vec_mradds(vec_sl(block[4], shift), constants[1], zero); \ vec_s16 vx5 = vec_mradds(vec_sl(block[5], shift), constants[4], zero); \ vec_s16 vx6 = vec_mradds(vec_sl(block[6], shift), constants[3], zero); \ vec_s16 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 } }; static void 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); } static void 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); } #endif /* HAVE_ALTIVEC */ av_cold void ff_idctdsp_init_ppc(IDCTDSPContext *c, AVCodecContext *avctx, unsigned high_bit_depth) { #if HAVE_ALTIVEC if (PPC_ALTIVEC(av_get_cpu_flags())) { if (!high_bit_depth) { if ((avctx->idct_algo == FF_IDCT_AUTO) || (avctx->idct_algo == FF_IDCT_ALTIVEC)) { c->idct_add = idct_add_altivec; c->idct_put = idct_put_altivec; c->idct_permutation_type = FF_TRANSPOSE_IDCT_PERM; } } } #endif /* HAVE_ALTIVEC */ }