ffmpeg / libavcodec / ppc / idct_altivec.c @ 2912e87a
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/*


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* Copyright (c) 2001 Michel Lespinasse

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*

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* This file is part of Libav.

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*

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* Libav is free software; you can redistribute it and/or

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* modify it under the terms of the GNU Lesser General Public

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* License as published by the Free Software Foundation; either

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* version 2.1 of the License, or (at your option) any later version.

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*

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* Libav is distributed in the hope that it will be useful,

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* but WITHOUT ANY WARRANTY; without even the implied warranty of

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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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* Lesser General Public License for more details.

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*

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* You should have received a copy of the GNU Lesser General Public

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* License along with Libav; if not, write to the Free Software

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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 021101301 USA

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*/

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/*

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* NOTE: This code is based on GPL code from the libmpeg2 project. The

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* author, Michel Lespinasses, has given explicit permission to release

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* under LGPL as part of Libav.

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*/

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/*

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* Libav integration by Dieter Shirley

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*

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* This file is a direct copy of the AltiVec IDCT module from the libmpeg2

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* project. I've deleted all of the libmpeg2specific code, renamed the

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* functions and reordered the function parameters. The only change to the

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* IDCT function itself was to factor out the partial transposition, and to

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* perform a full transpose at the end of the function.

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*/

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#include <stdlib.h> /* malloc(), free() */ 
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#include <string.h> 
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#include "config.h" 
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#if HAVE_ALTIVEC_H

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#include <altivec.h> 
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#endif

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#include "libavcodec/dsputil.h" 
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#include "types_altivec.h" 
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#include "dsputil_altivec.h" 
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#define IDCT_HALF \

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/* 1st stage */ \

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t1 = vec_mradds (a1, vx7, vx1 ); \ 
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t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \ 
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t7 = vec_mradds (a2, vx5, vx3); \ 
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t3 = vec_mradds (ma2, vx3, vx5); \ 
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\ 
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/* 2nd stage */ \

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t5 = vec_adds (vx0, vx4); \ 
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t0 = vec_subs (vx0, vx4); \ 
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t2 = vec_mradds (a0, vx6, vx2); \ 
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t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \ 
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t6 = vec_adds (t8, t3); \ 
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t3 = vec_subs (t8, t3); \ 
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t8 = vec_subs (t1, t7); \ 
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t1 = vec_adds (t1, t7); \ 
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\ 
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/* 3rd stage */ \

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t7 = vec_adds (t5, t2); \ 
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t2 = vec_subs (t5, t2); \ 
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t5 = vec_adds (t0, t4); \ 
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t0 = vec_subs (t0, t4); \ 
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t4 = vec_subs (t8, t3); \ 
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t3 = vec_adds (t8, t3); \ 
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\ 
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/* 4th stage */ \

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vy0 = vec_adds (t7, t1); \ 
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vy7 = vec_subs (t7, t1); \ 
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vy1 = vec_mradds (c4, t3, t5); \ 
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vy6 = vec_mradds (mc4, t3, t5); \ 
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vy2 = vec_mradds (c4, t4, t0); \ 
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vy5 = vec_mradds (mc4, t4, t0); \ 
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vy3 = vec_adds (t2, t6); \ 
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vy4 = vec_subs (t2, t6); 
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#define IDCT \

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vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7; \ 
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vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7; \ 
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vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias; \ 
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vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8; \ 
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vec_u16 shift; \ 
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\ 
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c4 = vec_splat (constants[0], 0); \ 
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a0 = vec_splat (constants[0], 1); \ 
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a1 = vec_splat (constants[0], 2); \ 
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a2 = vec_splat (constants[0], 3); \ 
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mc4 = vec_splat (constants[0], 4); \ 
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ma2 = vec_splat (constants[0], 5); \ 
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bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3); \ 
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\ 
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zero = vec_splat_s16 (0); \

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shift = vec_splat_u16 (4); \

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\ 
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vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero); \ 
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vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero); \ 
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vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero); \ 
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vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero); \ 
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vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero); \ 
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vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero); \ 
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vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero); \ 
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vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero); \ 
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\ 
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IDCT_HALF \ 
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\ 
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vx0 = vec_mergeh (vy0, vy4); \ 
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vx1 = vec_mergel (vy0, vy4); \ 
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vx2 = vec_mergeh (vy1, vy5); \ 
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vx3 = vec_mergel (vy1, vy5); \ 
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vx4 = vec_mergeh (vy2, vy6); \ 
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vx5 = vec_mergel (vy2, vy6); \ 
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vx6 = vec_mergeh (vy3, vy7); \ 
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vx7 = vec_mergel (vy3, vy7); \ 
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\ 
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vy0 = vec_mergeh (vx0, vx4); \ 
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vy1 = vec_mergel (vx0, vx4); \ 
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vy2 = vec_mergeh (vx1, vx5); \ 
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vy3 = vec_mergel (vx1, vx5); \ 
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vy4 = vec_mergeh (vx2, vx6); \ 
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vy5 = vec_mergel (vx2, vx6); \ 
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vy6 = vec_mergeh (vx3, vx7); \ 
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vy7 = vec_mergel (vx3, vx7); \ 
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\ 
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vx0 = vec_adds (vec_mergeh (vy0, vy4), bias); \ 
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vx1 = vec_mergel (vy0, vy4); \ 
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vx2 = vec_mergeh (vy1, vy5); \ 
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vx3 = vec_mergel (vy1, vy5); \ 
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vx4 = vec_mergeh (vy2, vy6); \ 
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vx5 = vec_mergel (vy2, vy6); \ 
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vx6 = vec_mergeh (vy3, vy7); \ 
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vx7 = vec_mergel (vy3, vy7); \ 
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\ 
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IDCT_HALF \ 
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\ 
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shift = vec_splat_u16 (6); \

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vx0 = vec_sra (vy0, shift); \ 
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vx1 = vec_sra (vy1, shift); \ 
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vx2 = vec_sra (vy2, shift); \ 
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vx3 = vec_sra (vy3, shift); \ 
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vx4 = vec_sra (vy4, shift); \ 
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vx5 = vec_sra (vy5, shift); \ 
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vx6 = vec_sra (vy6, shift); \ 
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vx7 = vec_sra (vy7, shift); 
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static const vec_s16 constants[5] = { 
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{23170, 13573, 6518, 21895, 23170, 21895, 32, 31}, 
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{16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725}, 
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{22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521}, 
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{21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692}, 
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{19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722} 
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}; 
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void idct_put_altivec(uint8_t* dest, int stride, int16_t *blk) 
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{ 
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vec_s16 *block = (vec_s16*)blk; 
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vec_u8 tmp; 
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IDCT 
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#define COPY(dest,src) \

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tmp = vec_packsu (src, src); \ 
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vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 
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vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 
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COPY (dest, vx0) dest += stride; 
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COPY (dest, vx1) dest += stride; 
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COPY (dest, vx2) dest += stride; 
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COPY (dest, vx3) dest += stride; 
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COPY (dest, vx4) dest += stride; 
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COPY (dest, vx5) dest += stride; 
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COPY (dest, vx6) dest += stride; 
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COPY (dest, vx7) 
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} 
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void idct_add_altivec(uint8_t* dest, int stride, int16_t *blk) 
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{ 
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vec_s16 *block = (vec_s16*)blk; 
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vec_u8 tmp; 
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vec_s16 tmp2, tmp3; 
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vec_u8 perm0; 
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vec_u8 perm1; 
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vec_u8 p0, p1, p; 
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IDCT 
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p0 = vec_lvsl (0, dest);

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p1 = vec_lvsl (stride, dest); 
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p = vec_splat_u8 (1);

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perm0 = vec_mergeh (p, p0); 
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perm1 = vec_mergeh (p, p1); 
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#define ADD(dest,src,perm) \

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/* *(uint64_t *)&tmp = *(uint64_t *)dest; */ \

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tmp = vec_ld (0, dest); \

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tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm); \ 
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tmp3 = vec_adds (tmp2, src); \ 
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tmp = vec_packsu (tmp3, tmp3); \ 
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vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest); \ 
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vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest); 
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ADD (dest, vx0, perm0) dest += stride; 
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ADD (dest, vx1, perm1) dest += stride; 
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ADD (dest, vx2, perm0) dest += stride; 
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ADD (dest, vx3, perm1) dest += stride; 
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ADD (dest, vx4, perm0) dest += stride; 
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ADD (dest, vx5, perm1) dest += stride; 
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ADD (dest, vx6, perm0) dest += stride; 
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ADD (dest, vx7, perm1) 
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} 
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