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/* |
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* Xvid MPEG-4 IDCT |
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* |
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* Copyright (C) 2006-2011 Xvid Solutions GmbH |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* Walken IDCT |
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* Alternative IDCT implementation for decoding compatibility. |
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* |
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* @author Skal |
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* @note This C version is not the original IDCT, but a modified one that |
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* yields the same error profile as the MMX/MMXEXT/SSE2 versions. |
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*/ |
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#include "config.h" |
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#include "libavutil/attributes.h" |
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#include "avcodec.h" |
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#include "idctdsp.h" |
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#include "xvididct.h" |
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#define ROW_SHIFT 11 |
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#define COL_SHIFT 6 |
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// #define FIX(x) (int)((x) * (1 << ROW_SHIFT)) |
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#define RND0 65536 // 1 << (COL_SHIFT + ROW_SHIFT - 1); |
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#define RND1 3597 // FIX (1.75683487303); |
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#define RND2 2260 // FIX (1.10355339059); |
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#define RND3 1203 // FIX (0.587788325588); |
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#define RND4 0 |
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#define RND5 120 // FIX (0.058658283817); |
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#define RND6 512 // FIX (0.25); |
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#define RND7 512 // FIX (0.25); |
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static const int TAB04[] = { 22725, 21407, 19266, 16384, 12873, 8867, 4520 }; |
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static const int TAB17[] = { 31521, 29692, 26722, 22725, 17855, 12299, 6270 }; |
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static const int TAB26[] = { 29692, 27969, 25172, 21407, 16819, 11585, 5906 }; |
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static const int TAB35[] = { 26722, 25172, 22654, 19266, 15137, 10426, 5315 }; |
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480000 |
static int idct_row(short *in, const int *const tab, int rnd) |
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{ |
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480000 |
const int c1 = tab[0]; |
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480000 |
const int c2 = tab[1]; |
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480000 |
const int c3 = tab[2]; |
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480000 |
const int c4 = tab[3]; |
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480000 |
const int c5 = tab[4]; |
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480000 |
const int c6 = tab[5]; |
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480000 |
const int c7 = tab[6]; |
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480000 |
const int right = in[5] | in[6] | in[7]; |
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480000 |
const int left = in[1] | in[2] | in[3]; |
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✓✓ |
480000 |
if (!(right | in[4])) { |
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264353 |
const int k = c4 * in[0] + rnd; |
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✓✓ |
264353 |
if (left) { |
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24730 |
const int a0 = k + c2 * in[2]; |
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const int a1 = k + c6 * in[2]; |
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const int a2 = k - c6 * in[2]; |
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24730 |
const int a3 = k - c2 * in[2]; |
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24730 |
const int b0 = c1 * in[1] + c3 * in[3]; |
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const int b1 = c3 * in[1] - c7 * in[3]; |
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const int b2 = c5 * in[1] - c1 * in[3]; |
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const int b3 = c7 * in[1] - c5 * in[3]; |
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24730 |
in[0] = (a0 + b0) >> ROW_SHIFT; |
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in[1] = (a1 + b1) >> ROW_SHIFT; |
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in[2] = (a2 + b2) >> ROW_SHIFT; |
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in[3] = (a3 + b3) >> ROW_SHIFT; |
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in[4] = (a3 - b3) >> ROW_SHIFT; |
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in[5] = (a2 - b2) >> ROW_SHIFT; |
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in[6] = (a1 - b1) >> ROW_SHIFT; |
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24730 |
in[7] = (a0 - b0) >> ROW_SHIFT; |
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} else { |
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239623 |
const int a0 = k >> ROW_SHIFT; |
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✓✓ |
239623 |
if (a0) { |
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97939 |
in[0] = |
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97939 |
in[1] = |
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97939 |
in[2] = |
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97939 |
in[3] = |
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97939 |
in[4] = |
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97939 |
in[5] = |
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97939 |
in[6] = |
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97939 |
in[7] = a0; |
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} else |
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141684 |
return 0; |
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} |
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✓✓ |
215647 |
} else if (!(left | right)) { |
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7429 |
const int a0 = (rnd + c4 * (in[0] + in[4])) >> ROW_SHIFT; |
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const int a1 = (rnd + c4 * (in[0] - in[4])) >> ROW_SHIFT; |
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in[0] = a0; |
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in[3] = a0; |
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in[4] = a0; |
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in[7] = a0; |
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in[1] = a1; |
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in[2] = a1; |
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in[5] = a1; |
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7429 |
in[6] = a1; |
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} else { |
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208218 |
const int k = c4 * in[0] + rnd; |
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208218 |
const unsigned int a0 = k + c2 * in[2] + c4 * in[4] + c6 * in[6]; |
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208218 |
const unsigned int a1 = k + c6 * in[2] - c4 * in[4] - c2 * in[6]; |
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208218 |
const unsigned int a2 = k - c6 * in[2] - c4 * in[4] + c2 * in[6]; |
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208218 |
const unsigned int a3 = k - c2 * in[2] + c4 * in[4] - c6 * in[6]; |
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208218 |
const unsigned int b0 = c1 * in[1] + c3 * in[3] + c5 * in[5] + c7 * in[7]; |
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208218 |
const unsigned int b1 = c3 * in[1] - c7 * in[3] - c1 * in[5] - c5 * in[7]; |
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208218 |
const unsigned int b2 = c5 * in[1] - c1 * in[3] + c7 * in[5] + c3 * in[7]; |
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208218 |
const unsigned int b3 = c7 * in[1] - c5 * in[3] + c3 * in[5] - c1 * in[7]; |
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208218 |
in[0] = (int)(a0 + b0) >> ROW_SHIFT; |
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208218 |
in[1] = (int)(a1 + b1) >> ROW_SHIFT; |
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208218 |
in[2] = (int)(a2 + b2) >> ROW_SHIFT; |
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208218 |
in[3] = (int)(a3 + b3) >> ROW_SHIFT; |
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208218 |
in[4] = (int)(a3 - b3) >> ROW_SHIFT; |
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208218 |
in[5] = (int)(a2 - b2) >> ROW_SHIFT; |
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208218 |
in[6] = (int)(a1 - b1) >> ROW_SHIFT; |
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208218 |
in[7] = (int)(a0 - b0) >> ROW_SHIFT; |
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} |
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338316 |
return 1; |
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} |
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#define TAN1 0x32EC |
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#define TAN2 0x6A0A |
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#define TAN3 0xAB0E |
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#define SQRT2 0x5A82 |
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#define MULT(c, x, n) ((unsigned)((int)((c) * (unsigned)(x)) >> (n))) |
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// 12b version => #define MULT(c,x, n) ((((c) >> 3) * (x)) >> ((n) - 3)) |
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// 12b zero-testing version: |
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#define BUTTERFLY(a, b, tmp) \ |
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(tmp) = (a) + (b); \ |
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(b) = (a) - (b); \ |
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(a) = (tmp) |
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#define LOAD_BUTTERFLY(m1, m2, a, b, tmp, s) \ |
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(m1) = (s)[(a)] + (s)[(b)]; \ |
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(m2) = (s)[(a)] - (s)[(b)] |
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384504 |
static void idct_col_8(short *const in) |
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{ |
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int mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7, spill; |
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// odd |
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384504 |
mm4 = (int) in[7 * 8]; |
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384504 |
mm5 = (int) in[5 * 8]; |
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384504 |
mm6 = (int) in[3 * 8]; |
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384504 |
mm7 = (int) in[1 * 8]; |
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384504 |
mm0 = MULT(TAN1, mm4, 16) + mm7; |
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384504 |
mm1 = MULT(TAN1, mm7, 16) - mm4; |
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384504 |
mm2 = MULT(TAN3, mm5, 16) + mm6; |
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384504 |
mm3 = MULT(TAN3, mm6, 16) - mm5; |
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384504 |
mm7 = mm0 + mm2; |
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384504 |
mm4 = mm1 - mm3; |
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384504 |
mm0 = mm0 - mm2; |
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384504 |
mm1 = mm1 + mm3; |
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384504 |
mm6 = mm0 + mm1; |
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384504 |
mm5 = mm0 - mm1; |
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384504 |
mm5 = 2 * MULT(SQRT2, mm5, 16); // 2*sqrt2 |
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384504 |
mm6 = 2 * MULT(SQRT2, mm6, 16); // Watch out: precision loss but done to match |
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// the pmulhw used in MMX/MMXEXT/SSE2 versions |
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// even |
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384504 |
mm1 = (int) in[2 * 8]; |
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384504 |
mm2 = (int) in[6 * 8]; |
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384504 |
mm3 = MULT(TAN2, mm2, 16) + mm1; |
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384504 |
mm2 = MULT(TAN2, mm1, 16) - mm2; |
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191 |
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384504 |
LOAD_BUTTERFLY(mm0, mm1, 0 * 8, 4 * 8, spill, in); |
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193 |
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384504 |
BUTTERFLY(mm0, mm3, spill); |
194 |
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384504 |
BUTTERFLY(mm0, mm7, spill); |
195 |
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384504 |
in[8 * 0] = (int16_t) (mm0 >> COL_SHIFT); |
196 |
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384504 |
in[8 * 7] = (int16_t) (mm7 >> COL_SHIFT); |
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384504 |
BUTTERFLY(mm3, mm4, mm0); |
198 |
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384504 |
in[8 * 3] = (int16_t) (mm3 >> COL_SHIFT); |
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384504 |
in[8 * 4] = (int16_t) (mm4 >> COL_SHIFT); |
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201 |
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384504 |
BUTTERFLY(mm1, mm2, mm0); |
202 |
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384504 |
BUTTERFLY(mm1, mm6, mm0); |
203 |
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384504 |
in[8 * 1] = (int16_t) (mm1 >> COL_SHIFT); |
204 |
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384504 |
in[8 * 6] = (int16_t) (mm6 >> COL_SHIFT); |
205 |
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384504 |
BUTTERFLY(mm2, mm5, mm0); |
206 |
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384504 |
in[8 * 2] = (int16_t) (mm2 >> COL_SHIFT); |
207 |
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384504 |
in[8 * 5] = (int16_t) (mm5 >> COL_SHIFT); |
208 |
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384504 |
} |
209 |
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210 |
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5896 |
static void idct_col_4(short *const in) |
211 |
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{ |
212 |
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int mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7, spill; |
213 |
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214 |
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// odd |
215 |
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216 |
|
5896 |
mm0 = (int) in[1 * 8]; |
217 |
|
5896 |
mm2 = (int) in[3 * 8]; |
218 |
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219 |
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5896 |
mm1 = MULT(TAN1, mm0, 16); |
220 |
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5896 |
mm3 = MULT(TAN3, mm2, 16); |
221 |
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222 |
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5896 |
mm7 = mm0 + mm2; |
223 |
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5896 |
mm4 = mm1 - mm3; |
224 |
|
5896 |
mm0 = mm0 - mm2; |
225 |
|
5896 |
mm1 = mm1 + mm3; |
226 |
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5896 |
mm6 = mm0 + mm1; |
227 |
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5896 |
mm5 = mm0 - mm1; |
228 |
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5896 |
mm6 = 2 * MULT(SQRT2, mm6, 16); // 2*sqrt2 |
229 |
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5896 |
mm5 = 2 * MULT(SQRT2, mm5, 16); |
230 |
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231 |
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// even |
232 |
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233 |
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5896 |
mm0 = mm1 = (int) in[0 * 8]; |
234 |
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5896 |
mm3 = (int) in[2 * 8]; |
235 |
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5896 |
mm2 = MULT(TAN2, mm3, 16); |
236 |
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237 |
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5896 |
BUTTERFLY(mm0, mm3, spill); |
238 |
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5896 |
BUTTERFLY(mm0, mm7, spill); |
239 |
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5896 |
in[8 * 0] = (int16_t) (mm0 >> COL_SHIFT); |
240 |
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5896 |
in[8 * 7] = (int16_t) (mm7 >> COL_SHIFT); |
241 |
|
5896 |
BUTTERFLY(mm3, mm4, mm0); |
242 |
|
5896 |
in[8 * 3] = (int16_t) (mm3 >> COL_SHIFT); |
243 |
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5896 |
in[8 * 4] = (int16_t) (mm4 >> COL_SHIFT); |
244 |
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245 |
|
5896 |
BUTTERFLY(mm1, mm2, mm0); |
246 |
|
5896 |
BUTTERFLY(mm1, mm6, mm0); |
247 |
|
5896 |
in[8 * 1] = (int16_t) (mm1 >> COL_SHIFT); |
248 |
|
5896 |
in[8 * 6] = (int16_t) (mm6 >> COL_SHIFT); |
249 |
|
5896 |
BUTTERFLY(mm2, mm5, mm0); |
250 |
|
5896 |
in[8 * 2] = (int16_t) (mm2 >> COL_SHIFT); |
251 |
|
5896 |
in[8 * 5] = (int16_t) (mm5 >> COL_SHIFT); |
252 |
|
5896 |
} |
253 |
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254 |
|
89600 |
static void idct_col_3(short *const in) |
255 |
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{ |
256 |
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int mm0, mm1, mm2, mm3, mm4, mm5, mm6, mm7, spill; |
257 |
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258 |
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// odd |
259 |
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260 |
|
89600 |
mm7 = (int) in[1 * 8]; |
261 |
|
89600 |
mm4 = MULT(TAN1, mm7, 16); |
262 |
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263 |
|
89600 |
mm6 = mm7 + mm4; |
264 |
|
89600 |
mm5 = mm7 - mm4; |
265 |
|
89600 |
mm6 = 2 * MULT(SQRT2, mm6, 16); // 2*sqrt2 |
266 |
|
89600 |
mm5 = 2 * MULT(SQRT2, mm5, 16); |
267 |
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268 |
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// even |
269 |
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|
270 |
|
89600 |
mm0 = mm1 = (int) in[0 * 8]; |
271 |
|
89600 |
mm3 = (int) in[2 * 8]; |
272 |
|
89600 |
mm2 = MULT(TAN2, mm3, 16); |
273 |
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|
274 |
|
89600 |
BUTTERFLY(mm0, mm3, spill); |
275 |
|
89600 |
BUTTERFLY(mm0, mm7, spill); |
276 |
|
89600 |
in[8 * 0] = (int16_t) (mm0 >> COL_SHIFT); |
277 |
|
89600 |
in[8 * 7] = (int16_t) (mm7 >> COL_SHIFT); |
278 |
|
89600 |
BUTTERFLY(mm3, mm4, mm0); |
279 |
|
89600 |
in[8 * 3] = (int16_t) (mm3 >> COL_SHIFT); |
280 |
|
89600 |
in[8 * 4] = (int16_t) (mm4 >> COL_SHIFT); |
281 |
|
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|
282 |
|
89600 |
BUTTERFLY(mm1, mm2, mm0); |
283 |
|
89600 |
BUTTERFLY(mm1, mm6, mm0); |
284 |
|
89600 |
in[8 * 1] = (int16_t) (mm1 >> COL_SHIFT); |
285 |
|
89600 |
in[8 * 6] = (int16_t) (mm6 >> COL_SHIFT); |
286 |
|
89600 |
BUTTERFLY(mm2, mm5, mm0); |
287 |
|
89600 |
in[8 * 2] = (int16_t) (mm2 >> COL_SHIFT); |
288 |
|
89600 |
in[8 * 5] = (int16_t) (mm5 >> COL_SHIFT); |
289 |
|
89600 |
} |
290 |
|
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|
291 |
|
60000 |
void ff_xvid_idct(int16_t *const in) |
292 |
|
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{ |
293 |
|
60000 |
int i, rows = 0x07; |
294 |
|
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|
295 |
|
60000 |
idct_row(in + 0 * 8, TAB04, RND0); |
296 |
|
60000 |
idct_row(in + 1 * 8, TAB17, RND1); |
297 |
|
60000 |
idct_row(in + 2 * 8, TAB26, RND2); |
298 |
✓✓ |
60000 |
if (idct_row(in + 3 * 8, TAB35, RND3)) |
299 |
|
29558 |
rows |= 0x08; |
300 |
✓✓ |
60000 |
if (idct_row(in + 4 * 8, TAB04, RND4)) |
301 |
|
29661 |
rows |= 0x10; |
302 |
✓✓ |
60000 |
if (idct_row(in + 5 * 8, TAB35, RND5)) |
303 |
|
29720 |
rows |= 0x20; |
304 |
✓✓ |
60000 |
if (idct_row(in + 6 * 8, TAB26, RND6)) |
305 |
|
29731 |
rows |= 0x40; |
306 |
✓✓ |
60000 |
if (idct_row(in + 7 * 8, TAB17, RND7)) |
307 |
|
39653 |
rows |= 0x80; |
308 |
|
|
|
309 |
✓✓ |
60000 |
if (rows & 0xF0) { |
310 |
✓✓ |
432567 |
for (i = 0; i < 8; i++) |
311 |
|
384504 |
idct_col_8(in + i); |
312 |
✓✓ |
11937 |
} else if (rows & 0x08) { |
313 |
✓✓ |
6633 |
for (i = 0; i < 8; i++) |
314 |
|
5896 |
idct_col_4(in + i); |
315 |
|
|
} else { |
316 |
✓✓ |
100800 |
for (i = 0; i < 8; i++) |
317 |
|
89600 |
idct_col_3(in + i); |
318 |
|
|
} |
319 |
|
60000 |
} |
320 |
|
|
|
321 |
|
|
static void xvid_idct_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block) |
322 |
|
|
{ |
323 |
|
|
ff_xvid_idct(block); |
324 |
|
|
ff_put_pixels_clamped_c(block, dest, line_size); |
325 |
|
|
} |
326 |
|
|
|
327 |
|
|
static void xvid_idct_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block) |
328 |
|
|
{ |
329 |
|
|
ff_xvid_idct(block); |
330 |
|
|
ff_add_pixels_clamped_c(block, dest, line_size); |
331 |
|
|
} |
332 |
|
|
|
333 |
|
4 |
av_cold void ff_xvid_idct_init(IDCTDSPContext *c, AVCodecContext *avctx) |
334 |
|
|
{ |
335 |
|
4 |
const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8; |
336 |
|
|
|
337 |
✓✗✓✗
|
4 |
if (high_bit_depth || avctx->lowres || |
338 |
✓✗ |
4 |
!(avctx->idct_algo == FF_IDCT_AUTO || |
339 |
✗✓ |
4 |
avctx->idct_algo == FF_IDCT_XVID)) |
340 |
|
|
return; |
341 |
|
|
|
342 |
✓✗ |
4 |
if (avctx->idct_algo == FF_IDCT_XVID) { |
343 |
|
4 |
c->idct_put = xvid_idct_put; |
344 |
|
4 |
c->idct_add = xvid_idct_add; |
345 |
|
4 |
c->idct = ff_xvid_idct; |
346 |
|
4 |
c->perm_type = FF_IDCT_PERM_NONE; |
347 |
|
|
} |
348 |
|
|
|
349 |
|
|
if (ARCH_X86) |
350 |
|
4 |
ff_xvid_idct_init_x86(c, avctx, high_bit_depth); |
351 |
|
|
if (ARCH_MIPS) |
352 |
|
|
ff_xvid_idct_init_mips(c, avctx, high_bit_depth); |
353 |
|
|
|
354 |
|
4 |
ff_init_scantable_permutation(c->idct_permutation, c->perm_type); |
355 |
|
|
} |