X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fjrevdct.c;h=395eb8c6388918f9c21c772c38429aa3e41525d9;hb=ddcf67c8a51c67b122a826d8b5819e96d591d813;hp=2ef40f38e540608e3d2a23115eee3f5742544e09;hpb=de6d9b6404bfd1c589799142da5a95428f146edd;p=ffmpeg diff --git a/libavcodec/jrevdct.c b/libavcodec/jrevdct.c index 2ef40f38e54..395eb8c6388 100644 --- a/libavcodec/jrevdct.c +++ b/libavcodec/jrevdct.c @@ -1,9 +1,40 @@ /* - * jrevdct.c - * - * Copyright (C) 1991, 1992, Thomas G. Lane. * This file is part of the Independent JPEG Group's software. - * For conditions of distribution and use, see the accompanying README file. + * + * The authors make NO WARRANTY or representation, either express or implied, + * with respect to this software, its quality, accuracy, merchantability, or + * fitness for a particular purpose. This software is provided "AS IS", and + * you, its user, assume the entire risk as to its quality and accuracy. + * + * This software is copyright (C) 1991, 1992, Thomas G. Lane. + * All Rights Reserved except as specified below. + * + * Permission is hereby granted to use, copy, modify, and distribute this + * software (or portions thereof) for any purpose, without fee, subject to + * these conditions: + * (1) If any part of the source code for this software is distributed, then + * this README file must be included, with this copyright and no-warranty + * notice unaltered; and any additions, deletions, or changes to the original + * files must be clearly indicated in accompanying documentation. + * (2) If only executable code is distributed, then the accompanying + * documentation must state that "this software is based in part on the work + * of the Independent JPEG Group". + * (3) Permission for use of this software is granted only if the user accepts + * full responsibility for any undesirable consequences; the authors accept + * NO LIABILITY for damages of any kind. + * + * These conditions apply to any software derived from or based on the IJG + * code, not just to the unmodified library. If you use our work, you ought + * to acknowledge us. + * + * Permission is NOT granted for the use of any IJG author's name or company + * name in advertising or publicity relating to this software or products + * derived from it. This software may be referred to only as "the Independent + * JPEG Group's software". + * + * We specifically permit and encourage the use of this software as the basis + * of commercial products, provided that all warranty or liability claims are + * assumed by the product vendor. * * This file contains the basic inverse-DCT transformation subroutine. * @@ -16,7 +47,7 @@ * The advantage of this method is that no data path contains more than one * multiplication; this allows a very simple and accurate implementation in * scaled fixed-point arithmetic, with a minimal number of shifts. - * + * * I've made lots of modifications to attempt to take advantage of the * sparse nature of the DCT matrices we're getting. Although the logic * is cumbersome, it's straightforward and the resulting code is much @@ -25,7 +56,13 @@ * A better way to do this would be to pass in the DCT block as a sparse * matrix, perhaps with the difference cases encoded. */ -#include "common.h" + +/** + * @file + * Independent JPEG Group's LLM idct. + */ + +#include "libavutil/common.h" #include "dsputil.h" #define EIGHT_BIT_SAMPLES @@ -89,10 +126,10 @@ typedef DCTELEM DCTBLOCK[DCTSIZE2]; #ifdef EIGHT_BIT_SAMPLES #define PASS1_BITS 2 #else -#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ +#define PASS1_BITS 1 /* lose a little precision to avoid overflow */ #endif -#define ONE ((INT32) 1) +#define ONE ((int32_t) 1) #define CONST_SCALE (ONE << CONST_BITS) @@ -103,16 +140,16 @@ typedef DCTELEM DCTBLOCK[DCTSIZE2]; */ /* Actually FIX is no longer used, we precomputed them all */ -#define FIX(x) ((INT32) ((x) * CONST_SCALE + 0.5)) +#define FIX(x) ((int32_t) ((x) * CONST_SCALE + 0.5)) -/* Descale and correctly round an INT32 value that's scaled by N bits. +/* Descale and correctly round an int32_t value that's scaled by N bits. * We assume RIGHT_SHIFT rounds towards minus infinity, so adding * the fudge factor is correct for either sign of X. */ #define DESCALE(x,n) RIGHT_SHIFT((x) + (ONE << ((n)-1)), n) -/* Multiply an INT32 variable by an INT32 constant to yield an INT32 result. +/* Multiply an int32_t variable by an int32_t constant to yield an int32_t result. * For 8-bit samples with the recommended scaling, all the variable * and constant values involved are no more than 16 bits wide, so a * 16x16->32 bit multiply can be used instead of a full 32x32 multiply; @@ -124,22 +161,22 @@ typedef DCTELEM DCTBLOCK[DCTSIZE2]; */ #ifdef EIGHT_BIT_SAMPLES -#ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */ -#define MULTIPLY(var,const) (((INT16) (var)) * ((INT16) (const))) +#ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */ +#define MULTIPLY(var,const) (((int16_t) (var)) * ((int16_t) (const))) #endif -#ifdef SHORTxLCONST_32 /* known to work with Microsoft C 6.0 */ -#define MULTIPLY(var,const) (((INT16) (var)) * ((INT32) (const))) +#ifdef SHORTxLCONST_32 /* known to work with Microsoft C 6.0 */ +#define MULTIPLY(var,const) (((int16_t) (var)) * ((int32_t) (const))) #endif #endif -#ifndef MULTIPLY /* default definition */ +#ifndef MULTIPLY /* default definition */ #define MULTIPLY(var,const) ((var) * (const)) #endif -/* +/* Unlike our decoder where we approximate the FIXes, we need to use exact -ones here or successive P-frames will drift too much with Reference frame coding +ones here or successive P-frames will drift too much with Reference frame coding */ #define FIX_0_211164243 1730 #define FIX_0_275899380 2260 @@ -170,15 +207,15 @@ ones here or successive P-frames will drift too much with Reference frame coding * Perform the inverse DCT on one block of coefficients. */ -void j_rev_dct(DCTBLOCK data) +void ff_j_rev_dct(DCTBLOCK data) { - INT32 tmp0, tmp1, tmp2, tmp3; - INT32 tmp10, tmp11, tmp12, tmp13; - INT32 z1, z2, z3, z4, z5; - INT32 d0, d1, d2, d3, d4, d5, d6, d7; + int32_t tmp0, tmp1, tmp2, tmp3; + int32_t tmp10, tmp11, tmp12, tmp13; + int32_t z1, z2, z3, z4, z5; + int32_t d0, d1, d2, d3, d4, d5, d6, d7; register DCTELEM *dataptr; int rowctr; - + /* Pass 1: process rows. */ /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ /* furthermore, we scale the results by 2**PASS1_BITS. */ @@ -197,29 +234,31 @@ void j_rev_dct(DCTBLOCK data) register int *idataptr = (int*)dataptr; + /* WARNING: we do the same permutation as MMX idct to simplify the + video core */ d0 = dataptr[0]; - d1 = dataptr[1]; - d2 = dataptr[2]; - d3 = dataptr[3]; - d4 = dataptr[4]; - d5 = dataptr[5]; - d6 = dataptr[6]; + d2 = dataptr[1]; + d4 = dataptr[2]; + d6 = dataptr[3]; + d1 = dataptr[4]; + d3 = dataptr[5]; + d5 = dataptr[6]; d7 = dataptr[7]; - if ((d1 == 0) && (idataptr[1] | idataptr[2] | idataptr[3]) == 0) { + if ((d1 | d2 | d3 | d4 | d5 | d6 | d7) == 0) { /* AC terms all zero */ if (d0) { - /* Compute a 32 bit value to assign. */ - DCTELEM dcval = (DCTELEM) (d0 << PASS1_BITS); - register int v = (dcval & 0xffff) | ((dcval << 16) & 0xffff0000); - - idataptr[0] = v; - idataptr[1] = v; - idataptr[2] = v; - idataptr[3] = v; + /* Compute a 32 bit value to assign. */ + DCTELEM dcval = (DCTELEM) (d0 << PASS1_BITS); + register int v = (dcval & 0xffff) | ((dcval << 16) & 0xffff0000); + + idataptr[0] = v; + idataptr[1] = v; + idataptr[2] = v; + idataptr[3] = v; } - - dataptr += DCTSIZE; /* advance pointer to next row */ + + dataptr += DCTSIZE; /* advance pointer to next row */ continue; } @@ -227,180 +266,50 @@ void j_rev_dct(DCTBLOCK data) /* The rotator is sqrt(2)*c(-6). */ { if (d6) { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } - } + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ + z1 = MULTIPLY(d2 + d6, FIX_0_541196100); + tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); + tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ + tmp2 = MULTIPLY(-d6, FIX_1_306562965); + tmp3 = MULTIPLY(d6, FIX_0_541196100); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } } else { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = (d0 + d4) << CONST_BITS; - tmp11 = tmp12 = (d0 - d4) << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = d4 << CONST_BITS; - tmp11 = tmp12 = -tmp10; - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = 0; - } - } - } + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ + tmp2 = MULTIPLY(d2, FIX_0_541196100); + tmp3 = MULTIPLY(d2, FIX_1_306562965); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ + tmp10 = tmp13 = (d0 + d4) << CONST_BITS; + tmp11 = tmp12 = (d0 - d4) << CONST_BITS; + } } /* Odd part per figure 8; the matrix is unitary and hence its @@ -408,259 +317,259 @@ void j_rev_dct(DCTBLOCK data) */ if (d7) { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5 + d3; - z3 = d7 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ - z2 = d5 + d3; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d5, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d5, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 = z1 + z4; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z4 = d5 + d1; - z5 = MULTIPLY(d7 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z3 = MULTIPLY(-d7, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 = z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z5 = MULTIPLY(d5 + d7, FIX_1_175875602); - - z3 += z5; - z4 += z5; - - tmp0 += z3; - tmp1 += z4; - tmp2 = z2 + z3; - tmp3 = z1 + z4; - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d1, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d1, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 = z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ - z3 = d7 + d3; - - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - tmp2 = MULTIPLY(d3, FIX_0_509795579); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z5 = MULTIPLY(z3, FIX_1_175875602); - z3 = MULTIPLY(-z3, FIX_0_785694958); - - tmp0 += z3; - tmp1 = z2 + z5; - tmp2 += z3; - tmp3 = z1 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z5 = MULTIPLY(z1, FIX_1_175875602); - - z1 = MULTIPLY(z1, FIX_0_275899380); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp0 = MULTIPLY(-d7, FIX_1_662939225); - z4 = MULTIPLY(-d1, FIX_0_390180644); - tmp3 = MULTIPLY(d1, FIX_1_111140466); - - tmp0 += z1; - tmp1 = z4 + z5; - tmp2 = z3 + z5; - tmp3 += z1; - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_1_387039845); - tmp1 = MULTIPLY(d7, FIX_1_175875602); - tmp2 = MULTIPLY(-d7, FIX_0_785694958); - tmp3 = MULTIPLY(d7, FIX_0_275899380); - } - } - } + if (d5) { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ + z1 = d7 + d1; + z2 = d5 + d3; + z3 = d7 + d3; + z4 = d5 + d1; + z5 = MULTIPLY(z3 + z4, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ + z2 = d5 + d3; + z3 = d7 + d3; + z5 = MULTIPLY(z3 + d5, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + z1 = MULTIPLY(-d7, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-d5, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 = z1 + z4; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ + z1 = d7 + d1; + z4 = d5 + d1; + z5 = MULTIPLY(d7 + z4, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z3 = MULTIPLY(-d7, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 = z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ + tmp0 = MULTIPLY(-d7, FIX_0_601344887); + z1 = MULTIPLY(-d7, FIX_0_899976223); + z3 = MULTIPLY(-d7, FIX_1_961570560); + tmp1 = MULTIPLY(-d5, FIX_0_509795579); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z4 = MULTIPLY(-d5, FIX_0_390180644); + z5 = MULTIPLY(d5 + d7, FIX_1_175875602); + + z3 += z5; + z4 += z5; + + tmp0 += z3; + tmp1 += z4; + tmp2 = z2 + z3; + tmp3 = z1 + z4; + } + } + } else { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ + z1 = d7 + d1; + z3 = d7 + d3; + z5 = MULTIPLY(z3 + d1, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-d3, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-d1, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 = z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ + z3 = d7 + d3; + + tmp0 = MULTIPLY(-d7, FIX_0_601344887); + z1 = MULTIPLY(-d7, FIX_0_899976223); + tmp2 = MULTIPLY(d3, FIX_0_509795579); + z2 = MULTIPLY(-d3, FIX_2_562915447); + z5 = MULTIPLY(z3, FIX_1_175875602); + z3 = MULTIPLY(-z3, FIX_0_785694958); + + tmp0 += z3; + tmp1 = z2 + z5; + tmp2 += z3; + tmp3 = z1 + z5; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ + z1 = d7 + d1; + z5 = MULTIPLY(z1, FIX_1_175875602); + + z1 = MULTIPLY(z1, FIX_0_275899380); + z3 = MULTIPLY(-d7, FIX_1_961570560); + tmp0 = MULTIPLY(-d7, FIX_1_662939225); + z4 = MULTIPLY(-d1, FIX_0_390180644); + tmp3 = MULTIPLY(d1, FIX_1_111140466); + + tmp0 += z1; + tmp1 = z4 + z5; + tmp2 = z3 + z5; + tmp3 += z1; + } else { + /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ + tmp0 = MULTIPLY(-d7, FIX_1_387039845); + tmp1 = MULTIPLY(d7, FIX_1_175875602); + tmp2 = MULTIPLY(-d7, FIX_0_785694958); + tmp3 = MULTIPLY(d7, FIX_0_275899380); + } + } + } } else { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(d3 + z4, FIX_1_175875602); - - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-d1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-d3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 = z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - - z5 = MULTIPLY(z2, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_1_662939225); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z2 = MULTIPLY(-z2, FIX_1_387039845); - tmp2 = MULTIPLY(d3, FIX_1_111140466); - z3 = MULTIPLY(-d3, FIX_1_961570560); - - tmp0 = z3 + z5; - tmp1 += z2; - tmp2 += z2; - tmp3 = z4 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ - z4 = d5 + d1; - - z5 = MULTIPLY(z4, FIX_1_175875602); - z1 = MULTIPLY(-d1, FIX_0_899976223); - tmp3 = MULTIPLY(d1, FIX_0_601344887); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(z4, FIX_0_785694958); - - tmp0 = z1 + z5; - tmp1 += z4; - tmp2 = z2 + z5; - tmp3 += z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ - tmp0 = MULTIPLY(d5, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_0_275899380); - tmp2 = MULTIPLY(-d5, FIX_1_387039845); - tmp3 = MULTIPLY(d5, FIX_0_785694958); - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ - z5 = d1 + d3; - tmp3 = MULTIPLY(d1, FIX_0_211164243); - tmp2 = MULTIPLY(-d3, FIX_1_451774981); - z1 = MULTIPLY(d1, FIX_1_061594337); - z2 = MULTIPLY(-d3, FIX_2_172734803); - z4 = MULTIPLY(z5, FIX_0_785694958); - z5 = MULTIPLY(z5, FIX_1_175875602); - - tmp0 = z1 - z4; - tmp1 = z2 + z4; - tmp2 += z5; - tmp3 += z5; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(-d3, FIX_0_785694958); - tmp1 = MULTIPLY(-d3, FIX_1_387039845); - tmp2 = MULTIPLY(-d3, FIX_0_275899380); - tmp3 = MULTIPLY(d3, FIX_1_175875602); - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(d1, FIX_0_275899380); - tmp1 = MULTIPLY(d1, FIX_0_785694958); - tmp2 = MULTIPLY(d1, FIX_1_175875602); - tmp3 = MULTIPLY(d1, FIX_1_387039845); - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = tmp1 = tmp2 = tmp3 = 0; - } - } - } + if (d5) { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ + z2 = d5 + d3; + z4 = d5 + d1; + z5 = MULTIPLY(d3 + z4, FIX_1_175875602); + + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-d1, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-d3, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 = z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ + z2 = d5 + d3; + + z5 = MULTIPLY(z2, FIX_1_175875602); + tmp1 = MULTIPLY(d5, FIX_1_662939225); + z4 = MULTIPLY(-d5, FIX_0_390180644); + z2 = MULTIPLY(-z2, FIX_1_387039845); + tmp2 = MULTIPLY(d3, FIX_1_111140466); + z3 = MULTIPLY(-d3, FIX_1_961570560); + + tmp0 = z3 + z5; + tmp1 += z2; + tmp2 += z2; + tmp3 = z4 + z5; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ + z4 = d5 + d1; + + z5 = MULTIPLY(z4, FIX_1_175875602); + z1 = MULTIPLY(-d1, FIX_0_899976223); + tmp3 = MULTIPLY(d1, FIX_0_601344887); + tmp1 = MULTIPLY(-d5, FIX_0_509795579); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z4 = MULTIPLY(z4, FIX_0_785694958); + + tmp0 = z1 + z5; + tmp1 += z4; + tmp2 = z2 + z5; + tmp3 += z4; + } else { + /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ + tmp0 = MULTIPLY(d5, FIX_1_175875602); + tmp1 = MULTIPLY(d5, FIX_0_275899380); + tmp2 = MULTIPLY(-d5, FIX_1_387039845); + tmp3 = MULTIPLY(d5, FIX_0_785694958); + } + } + } else { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ + z5 = d1 + d3; + tmp3 = MULTIPLY(d1, FIX_0_211164243); + tmp2 = MULTIPLY(-d3, FIX_1_451774981); + z1 = MULTIPLY(d1, FIX_1_061594337); + z2 = MULTIPLY(-d3, FIX_2_172734803); + z4 = MULTIPLY(z5, FIX_0_785694958); + z5 = MULTIPLY(z5, FIX_1_175875602); + + tmp0 = z1 - z4; + tmp1 = z2 + z4; + tmp2 += z5; + tmp3 += z5; + } else { + /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ + tmp0 = MULTIPLY(-d3, FIX_0_785694958); + tmp1 = MULTIPLY(-d3, FIX_1_387039845); + tmp2 = MULTIPLY(-d3, FIX_0_275899380); + tmp3 = MULTIPLY(d3, FIX_1_175875602); + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ + tmp0 = MULTIPLY(d1, FIX_0_275899380); + tmp1 = MULTIPLY(d1, FIX_0_785694958); + tmp2 = MULTIPLY(d1, FIX_1_175875602); + tmp3 = MULTIPLY(d1, FIX_1_387039845); + } else { + /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ + tmp0 = tmp1 = tmp2 = tmp3 = 0; + } + } + } } } /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ @@ -674,7 +583,7 @@ void j_rev_dct(DCTBLOCK data) dataptr[3] = (DCTELEM) DESCALE(tmp13 + tmp0, CONST_BITS-PASS1_BITS); dataptr[4] = (DCTELEM) DESCALE(tmp13 - tmp0, CONST_BITS-PASS1_BITS); - dataptr += DCTSIZE; /* advance pointer to next row */ + dataptr += DCTSIZE; /* advance pointer to next row */ } /* Pass 2: process columns. */ @@ -703,465 +612,544 @@ void j_rev_dct(DCTBLOCK data) /* Even part: reverse the even part of the forward DCT. */ /* The rotator is sqrt(2)*c(-6). */ if (d6) { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */ - z1 = MULTIPLY(d2 + d6, FIX_0_541196100); - tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); - tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */ - tmp2 = MULTIPLY(-d6, FIX_1_306562965); - tmp3 = MULTIPLY(d6, FIX_0_541196100); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } - } + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ + z1 = MULTIPLY(d2 + d6, FIX_0_541196100); + tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); + tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ + tmp2 = MULTIPLY(-d6, FIX_1_306562965); + tmp3 = MULTIPLY(d6, FIX_0_541196100); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } } else { - if (d4) { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = (d0 + d4) << CONST_BITS; - tmp1 = (d0 - d4) << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp1 + tmp2; - tmp12 = tmp1 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d4 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp2 - tmp0; - tmp12 = -(tmp0 + tmp2); - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = (d0 + d4) << CONST_BITS; - tmp11 = tmp12 = (d0 - d4) << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */ - tmp10 = tmp13 = d4 << CONST_BITS; - tmp11 = tmp12 = -tmp10; - } - } - } else { - if (d2) { - if (d0) { - /* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp0 = d0 << CONST_BITS; - - tmp10 = tmp0 + tmp3; - tmp13 = tmp0 - tmp3; - tmp11 = tmp0 + tmp2; - tmp12 = tmp0 - tmp2; - } else { - /* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */ - tmp2 = MULTIPLY(d2, FIX_0_541196100); - tmp3 = MULTIPLY(d2, FIX_1_306562965); - - tmp10 = tmp3; - tmp13 = -tmp3; - tmp11 = tmp2; - tmp12 = -tmp2; - } - } else { - if (d0) { - /* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS; - } else { - /* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */ - tmp10 = tmp13 = tmp11 = tmp12 = 0; - } - } - } + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ + tmp2 = MULTIPLY(d2, FIX_0_541196100); + tmp3 = MULTIPLY(d2, FIX_1_306562965); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ + tmp10 = tmp13 = (d0 + d4) << CONST_BITS; + tmp11 = tmp12 = (d0 - d4) << CONST_BITS; + } } /* Odd part per figure 8; the matrix is unitary and hence its * transpose is its inverse. i0..i3 are y7,y5,y3,y1 respectively. */ if (d7) { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5 + d3; - z3 = d7 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ - z1 = d7; - z2 = d5 + d3; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d5, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d5, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 = z1 + z4; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ - z1 = d7 + d1; - z2 = d5; - z3 = d7; - z4 = d5 + d1; - z5 = MULTIPLY(z3 + z4, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z3 = MULTIPLY(-d7, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 += z2 + z4; - tmp2 = z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z5 = MULTIPLY(d5 + d7, FIX_1_175875602); - - z3 += z5; - z4 += z5; - - tmp0 += z3; - tmp1 += z4; - tmp2 = z2 + z3; - tmp3 = z1 + z4; - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z3 = d7 + d3; - z5 = MULTIPLY(z3 + d1, FIX_1_175875602); - - tmp0 = MULTIPLY(d7, FIX_0_298631336); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-z1, FIX_0_899976223); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z3 = MULTIPLY(-z3, FIX_1_961570560); - z4 = MULTIPLY(-d1, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 += z1 + z3; - tmp1 = z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ - z3 = d7 + d3; - - tmp0 = MULTIPLY(-d7, FIX_0_601344887); - z1 = MULTIPLY(-d7, FIX_0_899976223); - tmp2 = MULTIPLY(d3, FIX_0_509795579); - z2 = MULTIPLY(-d3, FIX_2_562915447); - z5 = MULTIPLY(z3, FIX_1_175875602); - z3 = MULTIPLY(-z3, FIX_0_785694958); - - tmp0 += z3; - tmp1 = z2 + z5; - tmp2 += z3; - tmp3 = z1 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ - z1 = d7 + d1; - z5 = MULTIPLY(z1, FIX_1_175875602); - - z1 = MULTIPLY(z1, FIX_0_275899380); - z3 = MULTIPLY(-d7, FIX_1_961570560); - tmp0 = MULTIPLY(-d7, FIX_1_662939225); - z4 = MULTIPLY(-d1, FIX_0_390180644); - tmp3 = MULTIPLY(d1, FIX_1_111140466); - - tmp0 += z1; - tmp1 = z4 + z5; - tmp2 = z3 + z5; - tmp3 += z1; - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ - tmp0 = MULTIPLY(-d7, FIX_1_387039845); - tmp1 = MULTIPLY(d7, FIX_1_175875602); - tmp2 = MULTIPLY(-d7, FIX_0_785694958); - tmp3 = MULTIPLY(d7, FIX_0_275899380); - } - } - } + if (d5) { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 != 0, d7 != 0 */ + z1 = d7 + d1; + z2 = d5 + d3; + z3 = d7 + d3; + z4 = d5 + d1; + z5 = MULTIPLY(z3 + z4, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 != 0, d7 != 0 */ + z2 = d5 + d3; + z3 = d7 + d3; + z5 = MULTIPLY(z3 + d5, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + z1 = MULTIPLY(-d7, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-d5, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 = z1 + z4; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 != 0, d7 != 0 */ + z1 = d7 + d1; + z3 = d7; + z4 = d5 + d1; + z5 = MULTIPLY(z3 + z4, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z3 = MULTIPLY(-d7, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 += z2 + z4; + tmp2 = z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 == 0, d5 != 0, d7 != 0 */ + tmp0 = MULTIPLY(-d7, FIX_0_601344887); + z1 = MULTIPLY(-d7, FIX_0_899976223); + z3 = MULTIPLY(-d7, FIX_1_961570560); + tmp1 = MULTIPLY(-d5, FIX_0_509795579); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z4 = MULTIPLY(-d5, FIX_0_390180644); + z5 = MULTIPLY(d5 + d7, FIX_1_175875602); + + z3 += z5; + z4 += z5; + + tmp0 += z3; + tmp1 += z4; + tmp2 = z2 + z3; + tmp3 = z1 + z4; + } + } + } else { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 == 0, d7 != 0 */ + z1 = d7 + d1; + z3 = d7 + d3; + z5 = MULTIPLY(z3 + d1, FIX_1_175875602); + + tmp0 = MULTIPLY(d7, FIX_0_298631336); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-z1, FIX_0_899976223); + z2 = MULTIPLY(-d3, FIX_2_562915447); + z3 = MULTIPLY(-z3, FIX_1_961570560); + z4 = MULTIPLY(-d1, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 += z1 + z3; + tmp1 = z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 == 0, d7 != 0 */ + z3 = d7 + d3; + + tmp0 = MULTIPLY(-d7, FIX_0_601344887); + z1 = MULTIPLY(-d7, FIX_0_899976223); + tmp2 = MULTIPLY(d3, FIX_0_509795579); + z2 = MULTIPLY(-d3, FIX_2_562915447); + z5 = MULTIPLY(z3, FIX_1_175875602); + z3 = MULTIPLY(-z3, FIX_0_785694958); + + tmp0 += z3; + tmp1 = z2 + z5; + tmp2 += z3; + tmp3 = z1 + z5; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 == 0, d7 != 0 */ + z1 = d7 + d1; + z5 = MULTIPLY(z1, FIX_1_175875602); + + z1 = MULTIPLY(z1, FIX_0_275899380); + z3 = MULTIPLY(-d7, FIX_1_961570560); + tmp0 = MULTIPLY(-d7, FIX_1_662939225); + z4 = MULTIPLY(-d1, FIX_0_390180644); + tmp3 = MULTIPLY(d1, FIX_1_111140466); + + tmp0 += z1; + tmp1 = z4 + z5; + tmp2 = z3 + z5; + tmp3 += z1; + } else { + /* d1 == 0, d3 == 0, d5 == 0, d7 != 0 */ + tmp0 = MULTIPLY(-d7, FIX_1_387039845); + tmp1 = MULTIPLY(d7, FIX_1_175875602); + tmp2 = MULTIPLY(-d7, FIX_0_785694958); + tmp3 = MULTIPLY(d7, FIX_0_275899380); + } + } + } } else { - if (d5) { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - z4 = d5 + d1; - z5 = MULTIPLY(d3 + z4, FIX_1_175875602); - - tmp1 = MULTIPLY(d5, FIX_2_053119869); - tmp2 = MULTIPLY(d3, FIX_3_072711026); - tmp3 = MULTIPLY(d1, FIX_1_501321110); - z1 = MULTIPLY(-d1, FIX_0_899976223); - z2 = MULTIPLY(-z2, FIX_2_562915447); - z3 = MULTIPLY(-d3, FIX_1_961570560); - z4 = MULTIPLY(-z4, FIX_0_390180644); - - z3 += z5; - z4 += z5; - - tmp0 = z1 + z3; - tmp1 += z2 + z4; - tmp2 += z2 + z3; - tmp3 += z1 + z4; - } else { - /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ - z2 = d5 + d3; - - z5 = MULTIPLY(z2, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_1_662939225); - z4 = MULTIPLY(-d5, FIX_0_390180644); - z2 = MULTIPLY(-z2, FIX_1_387039845); - tmp2 = MULTIPLY(d3, FIX_1_111140466); - z3 = MULTIPLY(-d3, FIX_1_961570560); - - tmp0 = z3 + z5; - tmp1 += z2; - tmp2 += z2; - tmp3 = z4 + z5; - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ - z4 = d5 + d1; - - z5 = MULTIPLY(z4, FIX_1_175875602); - z1 = MULTIPLY(-d1, FIX_0_899976223); - tmp3 = MULTIPLY(d1, FIX_0_601344887); - tmp1 = MULTIPLY(-d5, FIX_0_509795579); - z2 = MULTIPLY(-d5, FIX_2_562915447); - z4 = MULTIPLY(z4, FIX_0_785694958); - - tmp0 = z1 + z5; - tmp1 += z4; - tmp2 = z2 + z5; - tmp3 += z4; - } else { - /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ - tmp0 = MULTIPLY(d5, FIX_1_175875602); - tmp1 = MULTIPLY(d5, FIX_0_275899380); - tmp2 = MULTIPLY(-d5, FIX_1_387039845); - tmp3 = MULTIPLY(d5, FIX_0_785694958); - } - } - } else { - if (d3) { - if (d1) { - /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ - z5 = d1 + d3; - tmp3 = MULTIPLY(d1, FIX_0_211164243); - tmp2 = MULTIPLY(-d3, FIX_1_451774981); - z1 = MULTIPLY(d1, FIX_1_061594337); - z2 = MULTIPLY(-d3, FIX_2_172734803); - z4 = MULTIPLY(z5, FIX_0_785694958); - z5 = MULTIPLY(z5, FIX_1_175875602); - - tmp0 = z1 - z4; - tmp1 = z2 + z4; - tmp2 += z5; - tmp3 += z5; - } else { - /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(-d3, FIX_0_785694958); - tmp1 = MULTIPLY(-d3, FIX_1_387039845); - tmp2 = MULTIPLY(-d3, FIX_0_275899380); - tmp3 = MULTIPLY(d3, FIX_1_175875602); - } - } else { - if (d1) { - /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = MULTIPLY(d1, FIX_0_275899380); - tmp1 = MULTIPLY(d1, FIX_0_785694958); - tmp2 = MULTIPLY(d1, FIX_1_175875602); - tmp3 = MULTIPLY(d1, FIX_1_387039845); - } else { - /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ - tmp0 = tmp1 = tmp2 = tmp3 = 0; - } - } - } + if (d5) { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 != 0, d7 == 0 */ + z2 = d5 + d3; + z4 = d5 + d1; + z5 = MULTIPLY(d3 + z4, FIX_1_175875602); + + tmp1 = MULTIPLY(d5, FIX_2_053119869); + tmp2 = MULTIPLY(d3, FIX_3_072711026); + tmp3 = MULTIPLY(d1, FIX_1_501321110); + z1 = MULTIPLY(-d1, FIX_0_899976223); + z2 = MULTIPLY(-z2, FIX_2_562915447); + z3 = MULTIPLY(-d3, FIX_1_961570560); + z4 = MULTIPLY(-z4, FIX_0_390180644); + + z3 += z5; + z4 += z5; + + tmp0 = z1 + z3; + tmp1 += z2 + z4; + tmp2 += z2 + z3; + tmp3 += z1 + z4; + } else { + /* d1 == 0, d3 != 0, d5 != 0, d7 == 0 */ + z2 = d5 + d3; + + z5 = MULTIPLY(z2, FIX_1_175875602); + tmp1 = MULTIPLY(d5, FIX_1_662939225); + z4 = MULTIPLY(-d5, FIX_0_390180644); + z2 = MULTIPLY(-z2, FIX_1_387039845); + tmp2 = MULTIPLY(d3, FIX_1_111140466); + z3 = MULTIPLY(-d3, FIX_1_961570560); + + tmp0 = z3 + z5; + tmp1 += z2; + tmp2 += z2; + tmp3 = z4 + z5; + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 != 0, d7 == 0 */ + z4 = d5 + d1; + + z5 = MULTIPLY(z4, FIX_1_175875602); + z1 = MULTIPLY(-d1, FIX_0_899976223); + tmp3 = MULTIPLY(d1, FIX_0_601344887); + tmp1 = MULTIPLY(-d5, FIX_0_509795579); + z2 = MULTIPLY(-d5, FIX_2_562915447); + z4 = MULTIPLY(z4, FIX_0_785694958); + + tmp0 = z1 + z5; + tmp1 += z4; + tmp2 = z2 + z5; + tmp3 += z4; + } else { + /* d1 == 0, d3 == 0, d5 != 0, d7 == 0 */ + tmp0 = MULTIPLY(d5, FIX_1_175875602); + tmp1 = MULTIPLY(d5, FIX_0_275899380); + tmp2 = MULTIPLY(-d5, FIX_1_387039845); + tmp3 = MULTIPLY(d5, FIX_0_785694958); + } + } + } else { + if (d3) { + if (d1) { + /* d1 != 0, d3 != 0, d5 == 0, d7 == 0 */ + z5 = d1 + d3; + tmp3 = MULTIPLY(d1, FIX_0_211164243); + tmp2 = MULTIPLY(-d3, FIX_1_451774981); + z1 = MULTIPLY(d1, FIX_1_061594337); + z2 = MULTIPLY(-d3, FIX_2_172734803); + z4 = MULTIPLY(z5, FIX_0_785694958); + z5 = MULTIPLY(z5, FIX_1_175875602); + + tmp0 = z1 - z4; + tmp1 = z2 + z4; + tmp2 += z5; + tmp3 += z5; + } else { + /* d1 == 0, d3 != 0, d5 == 0, d7 == 0 */ + tmp0 = MULTIPLY(-d3, FIX_0_785694958); + tmp1 = MULTIPLY(-d3, FIX_1_387039845); + tmp2 = MULTIPLY(-d3, FIX_0_275899380); + tmp3 = MULTIPLY(d3, FIX_1_175875602); + } + } else { + if (d1) { + /* d1 != 0, d3 == 0, d5 == 0, d7 == 0 */ + tmp0 = MULTIPLY(d1, FIX_0_275899380); + tmp1 = MULTIPLY(d1, FIX_0_785694958); + tmp2 = MULTIPLY(d1, FIX_1_175875602); + tmp3 = MULTIPLY(d1, FIX_1_387039845); + } else { + /* d1 == 0, d3 == 0, d5 == 0, d7 == 0 */ + tmp0 = tmp1 = tmp2 = tmp3 = 0; + } + } + } } /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp3, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp10 - tmp3, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp11 + tmp2, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(tmp11 - tmp2, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(tmp12 + tmp1, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp12 - tmp1, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp13 + tmp0, - CONST_BITS+PASS1_BITS+3); + CONST_BITS+PASS1_BITS+3); dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp13 - tmp0, - CONST_BITS+PASS1_BITS+3); - - dataptr++; /* advance pointer to next column */ + CONST_BITS+PASS1_BITS+3); + + dataptr++; /* advance pointer to next column */ + } +} + +#undef DCTSIZE +#define DCTSIZE 4 +#define DCTSTRIDE 8 + +void ff_j_rev_dct4(DCTBLOCK data) +{ + int32_t tmp0, tmp1, tmp2, tmp3; + int32_t tmp10, tmp11, tmp12, tmp13; + int32_t z1; + int32_t d0, d2, d4, d6; + register DCTELEM *dataptr; + int rowctr; + + /* Pass 1: process rows. */ + /* Note results are scaled up by sqrt(8) compared to a true IDCT; */ + /* furthermore, we scale the results by 2**PASS1_BITS. */ + + data[0] += 4; + + dataptr = data; + + for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) { + /* Due to quantization, we will usually find that many of the input + * coefficients are zero, especially the AC terms. We can exploit this + * by short-circuiting the IDCT calculation for any row in which all + * the AC terms are zero. In that case each output is equal to the + * DC coefficient (with scale factor as needed). + * With typical images and quantization tables, half or more of the + * row DCT calculations can be simplified this way. + */ + + register int *idataptr = (int*)dataptr; + + d0 = dataptr[0]; + d2 = dataptr[1]; + d4 = dataptr[2]; + d6 = dataptr[3]; + + if ((d2 | d4 | d6) == 0) { + /* AC terms all zero */ + if (d0) { + /* Compute a 32 bit value to assign. */ + DCTELEM dcval = (DCTELEM) (d0 << PASS1_BITS); + register int v = (dcval & 0xffff) | ((dcval << 16) & 0xffff0000); + + idataptr[0] = v; + idataptr[1] = v; + } + + dataptr += DCTSTRIDE; /* advance pointer to next row */ + continue; + } + + /* Even part: reverse the even part of the forward DCT. */ + /* The rotator is sqrt(2)*c(-6). */ + if (d6) { + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ + z1 = MULTIPLY(d2 + d6, FIX_0_541196100); + tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); + tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ + tmp2 = MULTIPLY(-d6, FIX_1_306562965); + tmp3 = MULTIPLY(d6, FIX_0_541196100); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } + } else { + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ + tmp2 = MULTIPLY(d2, FIX_0_541196100); + tmp3 = MULTIPLY(d2, FIX_1_306562965); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ + tmp10 = tmp13 = (d0 + d4) << CONST_BITS; + tmp11 = tmp12 = (d0 - d4) << CONST_BITS; + } + } + + /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ + + dataptr[0] = (DCTELEM) DESCALE(tmp10, CONST_BITS-PASS1_BITS); + dataptr[1] = (DCTELEM) DESCALE(tmp11, CONST_BITS-PASS1_BITS); + dataptr[2] = (DCTELEM) DESCALE(tmp12, CONST_BITS-PASS1_BITS); + dataptr[3] = (DCTELEM) DESCALE(tmp13, CONST_BITS-PASS1_BITS); + + dataptr += DCTSTRIDE; /* advance pointer to next row */ + } + + /* Pass 2: process columns. */ + /* Note that we must descale the results by a factor of 8 == 2**3, */ + /* and also undo the PASS1_BITS scaling. */ + + dataptr = data; + for (rowctr = DCTSIZE-1; rowctr >= 0; rowctr--) { + /* Columns of zeroes can be exploited in the same way as we did with rows. + * However, the row calculation has created many nonzero AC terms, so the + * simplification applies less often (typically 5% to 10% of the time). + * On machines with very fast multiplication, it's possible that the + * test takes more time than it's worth. In that case this section + * may be commented out. + */ + + d0 = dataptr[DCTSTRIDE*0]; + d2 = dataptr[DCTSTRIDE*1]; + d4 = dataptr[DCTSTRIDE*2]; + d6 = dataptr[DCTSTRIDE*3]; + + /* Even part: reverse the even part of the forward DCT. */ + /* The rotator is sqrt(2)*c(-6). */ + if (d6) { + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */ + z1 = MULTIPLY(d2 + d6, FIX_0_541196100); + tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065); + tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */ + tmp2 = MULTIPLY(-d6, FIX_1_306562965); + tmp3 = MULTIPLY(d6, FIX_0_541196100); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } + } else { + if (d2) { + /* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */ + tmp2 = MULTIPLY(d2, FIX_0_541196100); + tmp3 = MULTIPLY(d2, FIX_1_306562965); + + tmp0 = (d0 + d4) << CONST_BITS; + tmp1 = (d0 - d4) << CONST_BITS; + + tmp10 = tmp0 + tmp3; + tmp13 = tmp0 - tmp3; + tmp11 = tmp1 + tmp2; + tmp12 = tmp1 - tmp2; + } else { + /* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */ + tmp10 = tmp13 = (d0 + d4) << CONST_BITS; + tmp11 = tmp12 = (d0 - d4) << CONST_BITS; + } + } + + /* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */ + + dataptr[DCTSTRIDE*0] = tmp10 >> (CONST_BITS+PASS1_BITS+3); + dataptr[DCTSTRIDE*1] = tmp11 >> (CONST_BITS+PASS1_BITS+3); + dataptr[DCTSTRIDE*2] = tmp12 >> (CONST_BITS+PASS1_BITS+3); + dataptr[DCTSTRIDE*3] = tmp13 >> (CONST_BITS+PASS1_BITS+3); + + dataptr++; /* advance pointer to next column */ } } +void ff_j_rev_dct2(DCTBLOCK data){ + int d00, d01, d10, d11; + + data[0] += 4; + d00 = data[0+0*DCTSTRIDE] + data[1+0*DCTSTRIDE]; + d01 = data[0+0*DCTSTRIDE] - data[1+0*DCTSTRIDE]; + d10 = data[0+1*DCTSTRIDE] + data[1+1*DCTSTRIDE]; + d11 = data[0+1*DCTSTRIDE] - data[1+1*DCTSTRIDE]; + + data[0+0*DCTSTRIDE]= (d00 + d10)>>3; + data[1+0*DCTSTRIDE]= (d01 + d11)>>3; + data[0+1*DCTSTRIDE]= (d00 - d10)>>3; + data[1+1*DCTSTRIDE]= (d01 - d11)>>3; +} + +void ff_j_rev_dct1(DCTBLOCK data){ + data[0] = (data[0] + 4)>>3; +} +#undef FIX +#undef CONST_BITS