;/****************************************************************************; *; *  XVID MPEG-4 VIDEO CODEC; *  - MMX and XMM forward discrete cosine transform -; *; *  Copyright(C) 2001 Peter Ross <pross@xvid.org>; *; *  This program is free software; you can redistribute it and/or modify it; *  under the terms of the GNU General Public License as published by; *  the Free Software Foundation; either version 2 of the License, or; *  (at your option) any later version.; *; *  This program 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 General Public License for more details.; *; *  You should have received a copy of the GNU General Public License; *  along with this program; if not, write to the Free Software; *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA; *; * $Id$; *; ***************************************************************************/; ****************************************************************************;; Originally provided by Intel at AP-922; http://developer.intel.com/vtune/cbts/strmsimd/922down.htm; (See more app notes at http://developer.intel.com/vtune/cbts/strmsimd/appnotes.htm); but in a limited edition.; New macro implements a column part for precise iDCT; The routine precision now satisfies IEEE standard 1180-1990.;; Copyright(C) 2000-2001 Peter Gubanov <peter@elecard.net.ru>; Rounding trick Copyright(C) 2000 Michel Lespinasse <walken@zoy.org>;; http://www.elecard.com/peter/idct.html; http://www.linuxvideo.org/mpeg2dec/;; ***************************************************************************/;; These examples contain code fragments for first stage iDCT 8x8; (for rows) and first stage DCT 8x8 (for columns);BITS 32;=============================================================================; Macros and other preprocessor constants;=============================================================================%macro cglobal 1	%ifdef PREFIX		global _%1		%define %1 _%1	%else		global %1	%endif%endmacro%define BITS_INV_ACC    5                         ; 4 or 5 for IEEE%define SHIFT_INV_ROW   16 - BITS_INV_ACC%define SHIFT_INV_COL   1 + BITS_INV_ACC%define RND_INV_ROW     1024 * (6 - BITS_INV_ACC) ; 1 << (SHIFT_INV_ROW-1)%define RND_INV_COL     16 * (BITS_INV_ACC - 3)   ; 1 << (SHIFT_INV_COL-1)%define RND_INV_CORR    RND_INV_COL - 1           ; correction -1.0 and round%define BITS_FRW_ACC    3                         ; 2 or 3 for accuracy%define SHIFT_FRW_COL   BITS_FRW_ACC%define SHIFT_FRW_ROW   BITS_FRW_ACC + 17%define RND_FRW_ROW     262144*(BITS_FRW_ACC - 1) ; 1 << (SHIFT_FRW_ROW-1);=============================================================================; Local Data (Read Only);=============================================================================%ifdef FORMAT_COFFSECTION .rodata data%elseSECTION .rodata data align=16%endif;-----------------------------------------------------------------------------; Various memory constants (trigonometric values or rounding values);-----------------------------------------------------------------------------ALIGN 16one_corr:  dw 1, 1, 1, 1round_inv_row:  dd RND_INV_ROW,  RND_INV_ROWround_inv_col:  dw RND_INV_COL,  RND_INV_COL,  RND_INV_COL, RND_INV_COLround_inv_corr:  dw RND_INV_CORR, RND_INV_CORR, RND_INV_CORR, RND_INV_CORRround_frw_row:  dd RND_FRW_ROW,  RND_FRW_ROWtg_1_16:  dw 13036,  13036,  13036,  13036    ; tg * (2<<16) + 0.5tg_2_16:  dw 27146,  27146,  27146,  27146    ; tg * (2<<16) + 0.5tg_3_16:  dw -21746, -21746, -21746, -21746    ; tg * (2<<16) + 0.5cos_4_16:  dw -19195, -19195, -19195, -19195    ; cos * (2<<16) + 0.5ocos_4_16:  dw 23170,  23170,  23170,  23170    ; cos * (2<<15) + 0.5otg_3_16:  dw 21895, 21895, 21895, 21895       ; tg * (2<<16) + 0.5%if SHIFT_INV_ROW == 12   ; assume SHIFT_INV_ROW == 12rounder_0:  dd 65536, 65536rounder_4:  dd 0, 0rounder_1:  dd 7195, 7195rounder_7  dd 1024, 1024rounder_2:  dd 4520, 4520rounder_6:  dd 1024, 1024rounder_3:  dd 2407, 2407rounder_5:  dd 240, 240%elif SHIFT_INV_ROW == 11   ; assume SHIFT_INV_ROW == 11rounder_0:  dd 65536, 65536rounder_4:  dd 0, 0rounder_1:  dd 3597, 3597rounder_7:  dd 512, 512rounder_2:  dd 2260, 2260rounder_6:  dd 512, 512rounder_3:  dd 1203, 1203rounder_5:  dd 120, 120%else%error invalid SHIFT_INV_ROW%endif;-----------------------------------------------------------------------------;; The first stage iDCT 8x8 - inverse DCTs of rows;;-----------------------------------------------------------------------------; The 8-point inverse DCT direct algorithm;-----------------------------------------------------------------------------;; static const short w[32] = {;	FIX(cos_4_16),  FIX(cos_2_16),  FIX(cos_4_16),  FIX(cos_6_16),;	FIX(cos_4_16),  FIX(cos_6_16), -FIX(cos_4_16), -FIX(cos_2_16),;	FIX(cos_4_16), -FIX(cos_6_16), -FIX(cos_4_16),  FIX(cos_2_16),;	FIX(cos_4_16), -FIX(cos_2_16),  FIX(cos_4_16), -FIX(cos_6_16),;	FIX(cos_1_16),  FIX(cos_3_16),  FIX(cos_5_16),  FIX(cos_7_16),;	FIX(cos_3_16), -FIX(cos_7_16), -FIX(cos_1_16), -FIX(cos_5_16),;	FIX(cos_5_16), -FIX(cos_1_16),  FIX(cos_7_16),  FIX(cos_3_16),;	FIX(cos_7_16), -FIX(cos_5_16),  FIX(cos_3_16), -FIX(cos_1_16) };;; #define DCT_8_INV_ROW(x, y); {; 	int a0, a1, a2, a3, b0, b1, b2, b3;;; 	a0 =x[0]*w[0]+x[2]*w[1]+x[4]*w[2]+x[6]*w[3];; 	a1 =x[0]*w[4]+x[2]*w[5]+x[4]*w[6]+x[6]*w[7];; 	a2 = x[0] * w[ 8] + x[2] * w[ 9] + x[4] * w[10] + x[6] * w[11];; 	a3 = x[0] * w[12] + x[2] * w[13] + x[4] * w[14] + x[6] * w[15];; 	b0 = x[1] * w[16] + x[3] * w[17] + x[5] * w[18] + x[7] * w[19];; 	b1 = x[1] * w[20] + x[3] * w[21] + x[5] * w[22] + x[7] * w[23];; 	b2 = x[1] * w[24] + x[3] * w[25] + x[5] * w[26] + x[7] * w[27];; 	b3 = x[1] * w[28] + x[3] * w[29] + x[5] * w[30] + x[7] * w[31];;; 	y[0] = SHIFT_ROUND ( a0 + b0 );; 	y[1] = SHIFT_ROUND ( a1 + b1 );; 	y[2] = SHIFT_ROUND ( a2 + b2 );; 	y[3] = SHIFT_ROUND ( a3 + b3 );; 	y[4] = SHIFT_ROUND ( a3 - b3 );; 	y[5] = SHIFT_ROUND ( a2 - b2 );; 	y[6] = SHIFT_ROUND ( a1 - b1 );; 	y[7] = SHIFT_ROUND ( a0 - b0 );; };;-----------------------------------------------------------------------------;; In this implementation the outputs of the iDCT-1D are multiplied; 	for rows 0,4 - by cos_4_16,; 	for rows 1,7 - by cos_1_16,; 	for rows 2,6 - by cos_2_16,; 	for rows 3,5 - by cos_3_16; and are shifted to the left for better accuracy;; For the constants used,; 	FIX(float_const) = (short) (float_const * (1<<15) + 0.5);;-----------------------------------------------------------------------------;-----------------------------------------------------------------------------; Tables for mmx processors;-----------------------------------------------------------------------------; Table for rows 0,4 - constants are multiplied by cos_4_16tab_i_04_mmx:  dw  16384,  16384,  16384, -16384    ; movq-> w06 w04 w02 w00  dw  21407,   8867,   8867, -21407    ; w07 w05 w03 w01  dw  16384, -16384,  16384,  16384    ; w14 w12 w10 w08  dw  -8867,  21407, -21407,  -8867    ; w15 w13 w11 w09  dw  22725,  12873,  19266, -22725    ; w22 w20 w18 w16  dw  19266,   4520,  -4520, -12873    ; w23 w21 w19 w17  dw  12873,   4520,   4520,  19266    ; w30 w28 w26 w24  dw -22725,  19266, -12873, -22725    ; w31 w29 w27 w25; Table for rows 1,7 - constants are multiplied by cos_1_16tab_i_17_mmx:  dw  22725,  22725,  22725, -22725    ; movq-> w06 w04 w02 w00  dw  29692,  12299,  12299, -29692    ; w07 w05 w03 w01  dw  22725, -22725,  22725,  22725    ; w14 w12 w10 w08  dw -12299,  29692, -29692, -12299    ; w15 w13 w11 w09  dw  31521,  17855,  26722, -31521    ; w22 w20 w18 w16  dw  26722,   6270,  -6270, -17855    ; w23 w21 w19 w17  dw  17855,   6270,   6270,  26722    ; w30 w28 w26 w24  dw -31521,  26722, -17855, -31521    ; w31 w29 w27 w25; Table for rows 2,6 - constants are multiplied by cos_2_16tab_i_26_mmx:  dw  21407,  21407,  21407, -21407    ; movq-> w06 w04 w02 w00  dw  27969,  11585,  11585, -27969    ; w07 w05 w03 w01  dw  21407, -21407,  21407,  21407    ; w14 w12 w10 w08  dw -11585,  27969, -27969, -11585    ; w15 w13 w11 w09  dw  29692,  16819,  25172, -29692    ; w22 w20 w18 w16  dw  25172,   5906,  -5906, -16819    ; w23 w21 w19 w17  dw  16819,   5906,   5906,  25172    ; w30 w28 w26 w24  dw -29692,  25172, -16819, -29692    ; w31 w29 w27 w25; Table for rows 3,5 - constants are multiplied by cos_3_16tab_i_35_mmx:  dw  19266,  19266,  19266, -19266    ; movq-> w06 w04 w02 w00  dw  25172,  10426,  10426, -25172    ; w07 w05 w03 w01  dw  19266, -19266,  19266,  19266    ; w14 w12 w10 w08  dw -10426,  25172, -25172, -10426    ; w15 w13 w11 w09  dw  26722,  15137,  22654, -26722    ; w22 w20 w18 w16  dw  22654,   5315,  -5315, -15137    ; w23 w21 w19 w17  dw  15137,   5315,   5315,  22654    ; w30 w28 w26 w24  dw -26722,  22654, -15137, -26722    ; w31 w29 w27 w25;-----------------------------------------------------------------------------; Tables for xmm processors;-----------------------------------------------------------------------------; %3 for rows 0,4 - constants are multiplied by cos_4_16tab_i_04_xmm:  dw  16384,  21407,  16384,   8867 ; movq-> w05 w04 w01 w00  dw  16384,   8867, -16384, -21407 ; w07 w06 w03 w02  dw  16384,  -8867,  16384, -21407 ; w13 w12 w09 w08  dw -16384,  21407,  16384,  -8867 ; w15 w14 w11 w10  dw  22725,  19266,  19266,  -4520 ; w21 w20 w17 w16  dw  12873,   4520, -22725, -12873 ; w23 w22 w19 w18  dw  12873, -22725,   4520, -12873 ; w29 w28 w25 w24  dw   4520,  19266,  19266, -22725 ; w31 w30 w27 w26; %3 for rows 1,7 - constants are multiplied by cos_1_16tab_i_17_xmm:  dw  22725,  29692,  22725,  12299 ; movq-> w05 w04 w01 w00  dw  22725,  12299, -22725, -29692 ; w07 w06 w03 w02  dw  22725, -12299,  22725, -29692 ; w13 w12 w09 w08  dw -22725,  29692,  22725, -12299 ; w15 w14 w11 w10  dw  31521,  26722,  26722,  -6270 ; w21 w20 w17 w16  dw  17855,   6270, -31521, -17855 ; w23 w22 w19 w18  dw  17855, -31521,   6270, -17855 ; w29 w28 w25 w24  dw   6270,  26722,  26722, -31521 ; w31 w30 w27 w26; %3 for rows 2,6 - constants are multiplied by cos_2_16tab_i_26_xmm:  dw  21407,  27969,  21407,  11585 ; movq-> w05 w04 w01 w00  dw  21407,  11585, -21407, -27969 ; w07 w06 w03 w02  dw  21407, -11585,  21407, -27969 ; w13 w12 w09 w08  dw -21407,  27969,  21407, -11585 ; w15 w14 w11 w10  dw  29692,  25172,  25172,  -5906 ; w21 w20 w17 w16  dw  16819,   5906, -29692, -16819 ; w23 w22 w19 w18  dw  16819, -29692,   5906, -16819 ; w29 w28 w25 w24  dw   5906,  25172,  25172, -29692 ; w31 w30 w27 w26; %3 for rows 3,5 - constants are multiplied by cos_3_16tab_i_35_xmm:  dw  19266,  25172,  19266,  10426 ; movq-> w05 w04 w01 w00  dw  19266,  10426, -19266, -25172 ; w07 w06 w03 w02  dw  19266, -10426,  19266, -25172 ; w13 w12 w09 w08  dw -19266,  25172,  19266, -10426 ; w15 w14 w11 w10  dw  26722,  22654,  22654,  -5315 ; w21 w20 w17 w16  dw  15137,   5315, -26722, -15137 ; w23 w22 w19 w18  dw  15137, -26722,   5315, -15137 ; w29 w28 w25 w24  dw   5315,  22654,  22654, -26722 ; w31 w30 w27 w26;=============================================================================; Helper macros for the code;=============================================================================;-----------------------------------------------------------------------------; DCT_8_INV_ROW_MMX  INP, OUT, TABLE, ROUNDER;-----------------------------------------------------------------------------