summaryrefslogtreecommitdiff
path: root/contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c
diff options
context:
space:
mode:
Diffstat (limited to 'contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c')
-rw-r--r--contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c308
1 files changed, 0 insertions, 308 deletions
diff --git a/contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c b/contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c
deleted file mode 100644
index adadd3ab0..000000000
--- a/contrib/ffmpeg/libavcodec/alpha/simple_idct_alpha.c
+++ /dev/null
@@ -1,308 +0,0 @@
-/*
- * Simple IDCT (Alpha optimized)
- *
- * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * based upon some outcommented c code from mpeg2dec (idct_mmx.c
- * written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>)
- *
- * Alpha optimiziations by Måns Rullgård <mru@users.sourceforge.net>
- * and Falk Hueffner <falk@debian.org>
- */
-
-#include "asm.h"
-#include "../dsputil.h"
-
-extern void (*put_pixels_clamped_axp_p)(const DCTELEM *block, uint8_t *pixels,
- int line_size);
-extern void (*add_pixels_clamped_axp_p)(const DCTELEM *block, uint8_t *pixels,
- int line_size);
-
-// cos(i * M_PI / 16) * sqrt(2) * (1 << 14)
-// W4 is actually exactly 16384, but using 16383 works around
-// accumulating rounding errors for some encoders
-#define W1 ((int_fast32_t) 22725)
-#define W2 ((int_fast32_t) 21407)
-#define W3 ((int_fast32_t) 19266)
-#define W4 ((int_fast32_t) 16383)
-#define W5 ((int_fast32_t) 12873)
-#define W6 ((int_fast32_t) 8867)
-#define W7 ((int_fast32_t) 4520)
-#define ROW_SHIFT 11
-#define COL_SHIFT 20
-
-/* 0: all entries 0, 1: only first entry nonzero, 2: otherwise */
-static inline int idct_row(DCTELEM *row)
-{
- int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3, t;
- uint64_t l, r, t2;
- l = ldq(row);
- r = ldq(row + 4);
-
- if (l == 0 && r == 0)
- return 0;
-
- a0 = W4 * sextw(l) + (1 << (ROW_SHIFT - 1));
-
- if (((l & ~0xffffUL) | r) == 0) {
- a0 >>= ROW_SHIFT;
- t2 = (uint16_t) a0;
- t2 |= t2 << 16;
- t2 |= t2 << 32;
-
- stq(t2, row);
- stq(t2, row + 4);
- return 1;
- }
-
- a1 = a0;
- a2 = a0;
- a3 = a0;
-
- t = extwl(l, 4); /* row[2] */
- if (t != 0) {
- t = sextw(t);
- a0 += W2 * t;
- a1 += W6 * t;
- a2 -= W6 * t;
- a3 -= W2 * t;
- }
-
- t = extwl(r, 0); /* row[4] */
- if (t != 0) {
- t = sextw(t);
- a0 += W4 * t;
- a1 -= W4 * t;
- a2 -= W4 * t;
- a3 += W4 * t;
- }
-
- t = extwl(r, 4); /* row[6] */
- if (t != 0) {
- t = sextw(t);
- a0 += W6 * t;
- a1 -= W2 * t;
- a2 += W2 * t;
- a3 -= W6 * t;
- }
-
- t = extwl(l, 2); /* row[1] */
- if (t != 0) {
- t = sextw(t);
- b0 = W1 * t;
- b1 = W3 * t;
- b2 = W5 * t;
- b3 = W7 * t;
- } else {
- b0 = 0;
- b1 = 0;
- b2 = 0;
- b3 = 0;
- }
-
- t = extwl(l, 6); /* row[3] */
- if (t) {
- t = sextw(t);
- b0 += W3 * t;
- b1 -= W7 * t;
- b2 -= W1 * t;
- b3 -= W5 * t;
- }
-
-
- t = extwl(r, 2); /* row[5] */
- if (t) {
- t = sextw(t);
- b0 += W5 * t;
- b1 -= W1 * t;
- b2 += W7 * t;
- b3 += W3 * t;
- }
-
- t = extwl(r, 6); /* row[7] */
- if (t) {
- t = sextw(t);
- b0 += W7 * t;
- b1 -= W5 * t;
- b2 += W3 * t;
- b3 -= W1 * t;
- }
-
- row[0] = (a0 + b0) >> ROW_SHIFT;
- row[1] = (a1 + b1) >> ROW_SHIFT;
- row[2] = (a2 + b2) >> ROW_SHIFT;
- row[3] = (a3 + b3) >> ROW_SHIFT;
- row[4] = (a3 - b3) >> ROW_SHIFT;
- row[5] = (a2 - b2) >> ROW_SHIFT;
- row[6] = (a1 - b1) >> ROW_SHIFT;
- row[7] = (a0 - b0) >> ROW_SHIFT;
-
- return 2;
-}
-
-static inline void idct_col(DCTELEM *col)
-{
- int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
-
- col[0] += (1 << (COL_SHIFT - 1)) / W4;
-
- a0 = W4 * col[8 * 0];
- a1 = W4 * col[8 * 0];
- a2 = W4 * col[8 * 0];
- a3 = W4 * col[8 * 0];
-
- if (col[8 * 2]) {
- a0 += W2 * col[8 * 2];
- a1 += W6 * col[8 * 2];
- a2 -= W6 * col[8 * 2];
- a3 -= W2 * col[8 * 2];
- }
-
- if (col[8 * 4]) {
- a0 += W4 * col[8 * 4];
- a1 -= W4 * col[8 * 4];
- a2 -= W4 * col[8 * 4];
- a3 += W4 * col[8 * 4];
- }
-
- if (col[8 * 6]) {
- a0 += W6 * col[8 * 6];
- a1 -= W2 * col[8 * 6];
- a2 += W2 * col[8 * 6];
- a3 -= W6 * col[8 * 6];
- }
-
- if (col[8 * 1]) {
- b0 = W1 * col[8 * 1];
- b1 = W3 * col[8 * 1];
- b2 = W5 * col[8 * 1];
- b3 = W7 * col[8 * 1];
- } else {
- b0 = 0;
- b1 = 0;
- b2 = 0;
- b3 = 0;
- }
-
- if (col[8 * 3]) {
- b0 += W3 * col[8 * 3];
- b1 -= W7 * col[8 * 3];
- b2 -= W1 * col[8 * 3];
- b3 -= W5 * col[8 * 3];
- }
-
- if (col[8 * 5]) {
- b0 += W5 * col[8 * 5];
- b1 -= W1 * col[8 * 5];
- b2 += W7 * col[8 * 5];
- b3 += W3 * col[8 * 5];
- }
-
- if (col[8 * 7]) {
- b0 += W7 * col[8 * 7];
- b1 -= W5 * col[8 * 7];
- b2 += W3 * col[8 * 7];
- b3 -= W1 * col[8 * 7];
- }
-
- col[8 * 0] = (a0 + b0) >> COL_SHIFT;
- col[8 * 7] = (a0 - b0) >> COL_SHIFT;
- col[8 * 1] = (a1 + b1) >> COL_SHIFT;
- col[8 * 6] = (a1 - b1) >> COL_SHIFT;
- col[8 * 2] = (a2 + b2) >> COL_SHIFT;
- col[8 * 5] = (a2 - b2) >> COL_SHIFT;
- col[8 * 3] = (a3 + b3) >> COL_SHIFT;
- col[8 * 4] = (a3 - b3) >> COL_SHIFT;
-}
-
-/* If all rows but the first one are zero after row transformation,
- all rows will be identical after column transformation. */
-static inline void idct_col2(DCTELEM *col)
-{
- int i;
- uint64_t l, r;
-
- for (i = 0; i < 8; ++i) {
- int_fast32_t a0 = col[i] + (1 << (COL_SHIFT - 1)) / W4;
-
- a0 *= W4;
- col[i] = a0 >> COL_SHIFT;
- }
-
- l = ldq(col + 0 * 4); r = ldq(col + 1 * 4);
- stq(l, col + 2 * 4); stq(r, col + 3 * 4);
- stq(l, col + 4 * 4); stq(r, col + 5 * 4);
- stq(l, col + 6 * 4); stq(r, col + 7 * 4);
- stq(l, col + 8 * 4); stq(r, col + 9 * 4);
- stq(l, col + 10 * 4); stq(r, col + 11 * 4);
- stq(l, col + 12 * 4); stq(r, col + 13 * 4);
- stq(l, col + 14 * 4); stq(r, col + 15 * 4);
-}
-
-void simple_idct_axp(DCTELEM *block)
-{
-
- int i;
- int rowsZero = 1; /* all rows except row 0 zero */
- int rowsConstant = 1; /* all rows consist of a constant value */
-
- for (i = 0; i < 8; i++) {
- int sparseness = idct_row(block + 8 * i);
-
- if (i > 0 && sparseness > 0)
- rowsZero = 0;
- if (sparseness == 2)
- rowsConstant = 0;
- }
-
- if (rowsZero) {
- idct_col2(block);
- } else if (rowsConstant) {
- idct_col(block);
- for (i = 0; i < 8; i += 2) {
- uint64_t v = (uint16_t) block[0];
- uint64_t w = (uint16_t) block[8];
-
- v |= v << 16;
- w |= w << 16;
- v |= v << 32;
- w |= w << 32;
- stq(v, block + 0 * 4);
- stq(v, block + 1 * 4);
- stq(w, block + 2 * 4);
- stq(w, block + 3 * 4);
- block += 4 * 4;
- }
- } else {
- for (i = 0; i < 8; i++)
- idct_col(block + i);
- }
-}
-
-void simple_idct_put_axp(uint8_t *dest, int line_size, DCTELEM *block)
-{
- simple_idct_axp(block);
- put_pixels_clamped_axp_p(block, dest, line_size);
-}
-
-void simple_idct_add_axp(uint8_t *dest, int line_size, DCTELEM *block)
-{
- simple_idct_axp(block);
- add_pixels_clamped_axp_p(block, dest, line_size);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 11:53:05 +0000