| /* | |
| * 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 "config.h" | |
| #include <stdlib.h> | |
| #include <string.h> | |
| #include "libavutil/attributes.h" | |
| #include "libavutil/cpu.h" | |
| #include "libavutil/ppc/cpu.h" | |
| #include "libavutil/ppc/util_altivec.h" | |
| #include "libavcodec/avcodec.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_altivec(int16_t *blk) | |
| { | |
| vec_s16 *block = (vec_s16 *) blk; | |
| IDCT; | |
| block[0] = vx0; | |
| block[1] = vx1; | |
| block[2] = vx2; | |
| block[3] = vx3; | |
| block[4] = vx4; | |
| block[5] = vx5; | |
| block[6] = vx6; | |
| block[7] = vx7; | |
| } | |
| static void idct_put_altivec(uint8_t *dest, ptrdiff_t 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, ptrdiff_t 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; | |
| #if HAVE_BIGENDIAN | |
| 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); | |
| #endif | |
| #if HAVE_BIGENDIAN | |
| #define GET_TMP2(dest, prm) \ | |
| tmp = vec_ld(0, dest); \ | |
| tmp2 = (vec_s16) vec_perm(tmp, (vec_u8) zero, prm); | |
| #else | |
| #define GET_TMP2(dest, prm) \ | |
| tmp = vec_vsx_ld(0, dest); \ | |
| tmp2 = (vec_s16) vec_mergeh(tmp, (vec_u8) zero) | |
| #endif | |
| #define ADD(dest, src, perm) \ | |
| GET_TMP2(dest, 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())) | |
| return; | |
| if (!high_bit_depth && avctx->lowres == 0) { | |
| if ((avctx->idct_algo == FF_IDCT_AUTO && !(avctx->flags & AV_CODEC_FLAG_BITEXACT)) || | |
| (avctx->idct_algo == FF_IDCT_ALTIVEC)) { | |
| c->idct = idct_altivec; | |
| c->idct_add = idct_add_altivec; | |
| c->idct_put = idct_put_altivec; | |
| c->perm_type = FF_IDCT_PERM_TRANSPOSE; | |
| } | |
| } | |
| #endif /* HAVE_ALTIVEC */ | |
| } |