0,0 → 1,303 |
/* |
* Simple IDCT (Alpha optimized) |
* |
* Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at> |
* |
* based upon some outcommented C code from mpeg2dec (idct_mmx.c |
* written by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>) |
* |
* Alpha optimizations by Måns Rullgård <mans@mansr.com> |
* and Falk Hueffner <falk@debian.org> |
* |
* 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 |
*/ |
|
#include "dsputil_alpha.h" |
#include "asm.h" |
|
// 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 22725 |
#define W2 21407 |
#define W3 19266 |
#define W4 16383 |
#define W5 12873 |
#define W6 8867 |
#define W7 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(int16_t *row) |
{ |
int 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(int16_t *col) |
{ |
int 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(int16_t *col) |
{ |
int i; |
uint64_t l, r; |
|
for (i = 0; i < 8; ++i) { |
int 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 ff_simple_idct_axp(int16_t *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 ff_simple_idct_put_axp(uint8_t *dest, int line_size, int16_t *block) |
{ |
ff_simple_idct_axp(block); |
put_pixels_clamped_axp_p(block, dest, line_size); |
} |
|
void ff_simple_idct_add_axp(uint8_t *dest, int line_size, int16_t *block) |
{ |
ff_simple_idct_axp(block); |
add_pixels_clamped_axp_p(block, dest, line_size); |
} |