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5a49097b42
* commit '2ec9fa5ec60dcd10e1cb10d8b4e4437e634ea428': idct: Change type of array stride parameters to ptrdiff_t Merged-by: James Almer <jamrial@gmail.com>
304 lines
7.3 KiB
C
304 lines
7.3 KiB
C
/*
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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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* 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 optimizations by Måns Rullgård <mans@mansr.com>
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* and Falk Hueffner <falk@debian.org>
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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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#include "idctdsp_alpha.h"
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#include "asm.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 22725
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#define W2 21407
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#define W3 19266
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#define W4 16383
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#define W5 12873
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#define W6 8867
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#define W7 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(int16_t *row)
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{
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int a0, a1, a2, a3, b0, b1, b2, b3, t;
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uint64_t l, r, t2;
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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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t2 = (uint16_t) a0;
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t2 |= t2 << 16;
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t2 |= t2 << 32;
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stq(t2, row);
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stq(t2, 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(int16_t *col)
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{
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int 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(int16_t *col)
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{
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int i;
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uint64_t l, r;
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for (i = 0; i < 8; ++i) {
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int a0 = col[i] + (1 << (COL_SHIFT - 1)) / W4;
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a0 *= W4;
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col[i] = a0 >> COL_SHIFT;
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}
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l = ldq(col + 0 * 4); r = ldq(col + 1 * 4);
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stq(l, col + 2 * 4); stq(r, col + 3 * 4);
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stq(l, col + 4 * 4); stq(r, col + 5 * 4);
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stq(l, col + 6 * 4); stq(r, col + 7 * 4);
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stq(l, col + 8 * 4); stq(r, col + 9 * 4);
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stq(l, col + 10 * 4); stq(r, col + 11 * 4);
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stq(l, col + 12 * 4); stq(r, col + 13 * 4);
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stq(l, col + 14 * 4); stq(r, col + 15 * 4);
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}
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void ff_simple_idct_axp(int16_t *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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idct_col(block);
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for (i = 0; i < 8; i += 2) {
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uint64_t v = (uint16_t) block[0];
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uint64_t w = (uint16_t) block[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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stq(v, block + 0 * 4);
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stq(v, block + 1 * 4);
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stq(w, block + 2 * 4);
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stq(w, block + 3 * 4);
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block += 4 * 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 ff_simple_idct_put_axp(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
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{
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ff_simple_idct_axp(block);
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put_pixels_clamped_axp_p(block, dest, line_size);
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}
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void ff_simple_idct_add_axp(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
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{
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ff_simple_idct_axp(block);
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add_pixels_clamped_axp_p(block, dest, line_size);
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}
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