/*
* 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.
*
* 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
* A better way to do this would be to pass in the DCT block as a sparse
* matrix, perhaps with the difference cases encoded.
*/
-
+
/**
- * @file jrevdct.c
+ * @file libavcodec/jrevdct.c
* Independent JPEG Group's LLM idct.
*/
-
-#include "common.h"
+
+#include "libavutil/common.h"
#include "dsputil.h"
#define EIGHT_BIT_SAMPLES
#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_t) 1)
+#define ONE ((int32_t) 1)
#define CONST_SCALE (ONE << CONST_BITS)
*/
/* Actually FIX is no longer used, we precomputed them all */
-#define FIX(x) ((int32_t) ((x) * CONST_SCALE + 0.5))
+#define FIX(x) ((int32_t) ((x) * CONST_SCALE + 0.5))
/* Descale and correctly round an int32_t value that's scaled by N bits.
* We assume RIGHT_SHIFT rounds towards minus infinity, so adding
*/
#ifdef EIGHT_BIT_SAMPLES
-#ifdef SHORTxSHORT_32 /* may work if 'int' is 32 bits */
+#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 */
+#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
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. */
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;
}
/* 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
*/
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 */
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. */
/* 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 */
}
}
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--) {
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;
+ /* 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 */
+
+ 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 (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;
+ }
}
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
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 */
+ dataptr += DCTSTRIDE; /* advance pointer to next row */
}
/* Pass 2: process columns. */
/* 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;
+ }
}
/* Final output stage: inputs are tmp10..tmp13, tmp0..tmp3 */
- dataptr[DCTSTRIDE*0] = (DCTELEM) DESCALE(tmp10,
- CONST_BITS+PASS1_BITS+3);
- dataptr[DCTSTRIDE*1] = (DCTELEM) DESCALE(tmp11,
- CONST_BITS+PASS1_BITS+3);
- dataptr[DCTSTRIDE*2] = (DCTELEM) DESCALE(tmp12,
- CONST_BITS+PASS1_BITS+3);
- dataptr[DCTSTRIDE*3] = (DCTELEM) DESCALE(tmp13,
- CONST_BITS+PASS1_BITS+3);
-
- dataptr++; /* advance pointer to next column */
+ 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 */
}
}
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;
projects / frescor / ffmpeg.git / blobdiff