| /* |
| * 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/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 */ |
| } |
