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306 lines
7.3 KiB
306 lines
7.3 KiB
/* |
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* Simple IDCT (Alpha optimized) |
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* |
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* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This library 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 of the License, or (at your option) any later version. |
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* |
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* This library 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 this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* based upon some outcommented c code from mpeg2dec (idct_mmx.c |
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* written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>) |
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* |
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* Alpha optimiziations by Måns Rullgård <mru@users.sourceforge.net> |
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* and Falk Hueffner <falk@debian.org> |
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*/ |
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#include "asm.h" |
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#include "../dsputil.h" |
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// cos(i * M_PI / 16) * sqrt(2) * (1 << 14) |
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// W4 is actually exactly 16384, but using 16383 works around |
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// accumulating rounding errors for some encoders |
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#define W1 ((int_fast32_t) 22725) |
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#define W2 ((int_fast32_t) 21407) |
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#define W3 ((int_fast32_t) 19266) |
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#define W4 ((int_fast32_t) 16383) |
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#define W5 ((int_fast32_t) 12873) |
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#define W6 ((int_fast32_t) 8867) |
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#define W7 ((int_fast32_t) 4520) |
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#define ROW_SHIFT 11 |
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#define COL_SHIFT 20 |
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/* 0: all entries 0, 1: only first entry nonzero, 2: otherwise */ |
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static inline int idct_row(DCTELEM *row) |
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{ |
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int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3, t; |
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uint64_t l, r; |
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l = ldq(row); |
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r = ldq(row + 4); |
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if (l == 0 && r == 0) |
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return 0; |
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a0 = W4 * sextw(l) + (1 << (ROW_SHIFT - 1)); |
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if (((l & ~0xffffUL) | r) == 0) { |
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a0 >>= ROW_SHIFT; |
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a0 = (uint16_t) a0; |
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a0 |= a0 << 16; |
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a0 |= a0 << 32; |
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stq(a0, row); |
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stq(a0, row + 4); |
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return 1; |
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} |
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a1 = a0; |
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a2 = a0; |
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a3 = a0; |
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t = extwl(l, 4); /* row[2] */ |
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if (t != 0) { |
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t = sextw(t); |
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a0 += W2 * t; |
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a1 += W6 * t; |
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a2 -= W6 * t; |
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a3 -= W2 * t; |
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} |
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t = extwl(r, 0); /* row[4] */ |
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if (t != 0) { |
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t = sextw(t); |
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a0 += W4 * t; |
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a1 -= W4 * t; |
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a2 -= W4 * t; |
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a3 += W4 * t; |
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} |
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t = extwl(r, 4); /* row[6] */ |
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if (t != 0) { |
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t = sextw(t); |
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a0 += W6 * t; |
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a1 -= W2 * t; |
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a2 += W2 * t; |
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a3 -= W6 * t; |
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} |
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t = extwl(l, 2); /* row[1] */ |
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if (t != 0) { |
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t = sextw(t); |
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b0 = W1 * t; |
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b1 = W3 * t; |
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b2 = W5 * t; |
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b3 = W7 * t; |
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} else { |
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b0 = 0; |
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b1 = 0; |
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b2 = 0; |
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b3 = 0; |
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} |
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t = extwl(l, 6); /* row[3] */ |
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if (t) { |
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t = sextw(t); |
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b0 += W3 * t; |
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b1 -= W7 * t; |
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b2 -= W1 * t; |
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b3 -= W5 * t; |
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} |
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t = extwl(r, 2); /* row[5] */ |
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if (t) { |
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t = sextw(t); |
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b0 += W5 * t; |
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b1 -= W1 * t; |
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b2 += W7 * t; |
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b3 += W3 * t; |
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} |
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t = extwl(r, 6); /* row[7] */ |
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if (t) { |
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t = sextw(t); |
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b0 += W7 * t; |
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b1 -= W5 * t; |
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b2 += W3 * t; |
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b3 -= W1 * t; |
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} |
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row[0] = (a0 + b0) >> ROW_SHIFT; |
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row[1] = (a1 + b1) >> ROW_SHIFT; |
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row[2] = (a2 + b2) >> ROW_SHIFT; |
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row[3] = (a3 + b3) >> ROW_SHIFT; |
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row[4] = (a3 - b3) >> ROW_SHIFT; |
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row[5] = (a2 - b2) >> ROW_SHIFT; |
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row[6] = (a1 - b1) >> ROW_SHIFT; |
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row[7] = (a0 - b0) >> ROW_SHIFT; |
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return 2; |
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} |
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static inline void idct_col(DCTELEM *col) |
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{ |
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int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3; |
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col[0] += (1 << (COL_SHIFT - 1)) / W4; |
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a0 = W4 * col[8 * 0]; |
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a1 = W4 * col[8 * 0]; |
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a2 = W4 * col[8 * 0]; |
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a3 = W4 * col[8 * 0]; |
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if (col[8 * 2]) { |
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a0 += W2 * col[8 * 2]; |
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a1 += W6 * col[8 * 2]; |
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a2 -= W6 * col[8 * 2]; |
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a3 -= W2 * col[8 * 2]; |
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} |
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if (col[8 * 4]) { |
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a0 += W4 * col[8 * 4]; |
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a1 -= W4 * col[8 * 4]; |
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a2 -= W4 * col[8 * 4]; |
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a3 += W4 * col[8 * 4]; |
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} |
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if (col[8 * 6]) { |
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a0 += W6 * col[8 * 6]; |
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a1 -= W2 * col[8 * 6]; |
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a2 += W2 * col[8 * 6]; |
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a3 -= W6 * col[8 * 6]; |
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} |
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if (col[8 * 1]) { |
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b0 = W1 * col[8 * 1]; |
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b1 = W3 * col[8 * 1]; |
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b2 = W5 * col[8 * 1]; |
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b3 = W7 * col[8 * 1]; |
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} else { |
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b0 = 0; |
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b1 = 0; |
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b2 = 0; |
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b3 = 0; |
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} |
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if (col[8 * 3]) { |
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b0 += W3 * col[8 * 3]; |
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b1 -= W7 * col[8 * 3]; |
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b2 -= W1 * col[8 * 3]; |
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b3 -= W5 * col[8 * 3]; |
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} |
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if (col[8 * 5]) { |
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b0 += W5 * col[8 * 5]; |
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b1 -= W1 * col[8 * 5]; |
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b2 += W7 * col[8 * 5]; |
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b3 += W3 * col[8 * 5]; |
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} |
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if (col[8 * 7]) { |
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b0 += W7 * col[8 * 7]; |
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b1 -= W5 * col[8 * 7]; |
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b2 += W3 * col[8 * 7]; |
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b3 -= W1 * col[8 * 7]; |
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} |
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col[8 * 0] = (a0 + b0) >> COL_SHIFT; |
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col[8 * 7] = (a0 - b0) >> COL_SHIFT; |
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col[8 * 1] = (a1 + b1) >> COL_SHIFT; |
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col[8 * 6] = (a1 - b1) >> COL_SHIFT; |
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col[8 * 2] = (a2 + b2) >> COL_SHIFT; |
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col[8 * 5] = (a2 - b2) >> COL_SHIFT; |
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col[8 * 3] = (a3 + b3) >> COL_SHIFT; |
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col[8 * 4] = (a3 - b3) >> COL_SHIFT; |
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} |
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/* If all rows but the first one are zero after row transformation, |
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all rows will be identical after column transformation. */ |
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static inline void idct_col2(DCTELEM *col) |
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{ |
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int i; |
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uint64_t l, r; |
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uint64_t *lcol = (uint64_t *) col; |
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for (i = 0; i < 8; ++i) { |
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int_fast32_t a0 = col[0] + (1 << (COL_SHIFT - 1)) / W4; |
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a0 *= W4; |
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col[0] = a0 >> COL_SHIFT; |
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++col; |
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} |
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l = lcol[0]; |
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r = lcol[1]; |
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lcol[ 2] = l; lcol[ 3] = r; |
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lcol[ 4] = l; lcol[ 5] = r; |
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lcol[ 6] = l; lcol[ 7] = r; |
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lcol[ 8] = l; lcol[ 9] = r; |
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lcol[10] = l; lcol[11] = r; |
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lcol[12] = l; lcol[13] = r; |
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lcol[14] = l; lcol[15] = r; |
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} |
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void simple_idct_axp(DCTELEM *block) |
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{ |
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int i; |
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int rowsZero = 1; /* all rows except row 0 zero */ |
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int rowsConstant = 1; /* all rows consist of a constant value */ |
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for (i = 0; i < 8; i++) { |
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int sparseness = idct_row(block + 8 * i); |
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if (i > 0 && sparseness > 0) |
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rowsZero = 0; |
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if (sparseness == 2) |
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rowsConstant = 0; |
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} |
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if (rowsZero) { |
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idct_col2(block); |
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} else if (rowsConstant) { |
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uint64_t *lblock = (uint64_t *) block; |
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idct_col(block); |
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for (i = 0; i < 8; i += 2) { |
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uint64_t v = (uint16_t) block[i * 8]; |
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uint64_t w = (uint16_t) block[i * 8 + 8]; |
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v |= v << 16; |
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w |= w << 16; |
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v |= v << 32; |
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w |= w << 32; |
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lblock[0] = v; |
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lblock[1] = v; |
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lblock[2] = w; |
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lblock[3] = w; |
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lblock += 4; |
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} |
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} else { |
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for (i = 0; i < 8; i++) |
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idct_col(block + i); |
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} |
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} |
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void simple_idct_put_axp(uint8_t *dest, int line_size, DCTELEM *block) |
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{ |
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simple_idct_axp(block); |
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put_pixels_clamped(block, dest, line_size); |
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} |
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void simple_idct_add_axp(uint8_t *dest, int line_size, DCTELEM *block) |
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{ |
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simple_idct_axp(block); |
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add_pixels_clamped(block, dest, line_size); |
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}
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