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mpv/libmpeg2/idct_alpha.c

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/*
* idct_alpha.c
* Copyright (C) 2002 Falk Hueffner <falk@debian.org>
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef ARCH_ALPHA
#include <stdlib.h>
#include <inttypes.h>
#include "alpha_asm.h"
#include "attributes.h"
#define W1 2841 /* 2048*sqrt (2)*cos (1*pi/16) */
#define W2 2676 /* 2048*sqrt (2)*cos (2*pi/16) */
#define W3 2408 /* 2048*sqrt (2)*cos (3*pi/16) */
#define W5 1609 /* 2048*sqrt (2)*cos (5*pi/16) */
#define W6 1108 /* 2048*sqrt (2)*cos (6*pi/16) */
#define W7 565 /* 2048*sqrt (2)*cos (7*pi/16) */
static uint8_t clip_lut[1024];
#define CLIP(i) ((clip_lut+384)[(i)])
#if 0
#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
do { \
t0 = W0*d0 + W1*d1; \
t1 = W0*d1 - W1*d0; \
} while (0)
#else
#define BUTTERFLY(t0,t1,W0,W1,d0,d1) \
do { \
int_fast32_t tmp = W0 * (d0 + d1); \
t0 = tmp + (W1 - W0) * d1; \
t1 = tmp - (W1 + W0) * d0; \
} while (0)
#endif
static void inline idct_row (int16_t * const block)
{
uint64_t l, r;
int_fast32_t d0, d1, d2, d3;
int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
int_fast32_t t0, t1, t2, t3;
l = ldq (block);
r = ldq (block + 4);
/* shortcut */
if (likely (!((l & ~0xffffUL) | r))) {
uint64_t tmp = (uint16_t) (l << 3);
tmp |= tmp << 16;
tmp |= tmp << 32;
((int32_t *)block)[0] = tmp;
((int32_t *)block)[1] = tmp;
((int32_t *)block)[2] = tmp;
((int32_t *)block)[3] = tmp;
return;
}
d0 = (sextw (l) << 11) + 128;
d1 = sextw (extwl (l, 2));
d2 = sextw (extwl (l, 4)) << 11;
d3 = sextw (extwl (l, 6));
t0 = d0 + d2;
t1 = d0 - d2;
BUTTERFLY (t2, t3, W6, W2, d3, d1);
a0 = t0 + t2;
a1 = t1 + t3;
a2 = t1 - t3;
a3 = t0 - t2;
d0 = sextw (r);
d1 = sextw (extwl (r, 2));
d2 = sextw (extwl (r, 4));
d3 = sextw (extwl (r, 6));
BUTTERFLY (t0, t1, W7, W1, d3, d0);
BUTTERFLY (t2, t3, W3, W5, d1, d2);
b0 = t0 + t2;
b3 = t1 + t3;
t0 -= t2;
t1 -= t3;
b1 = ((t0 + t1) * 181) >> 8;
b2 = ((t0 - t1) * 181) >> 8;
block[0] = (a0 + b0) >> 8;
block[1] = (a1 + b1) >> 8;
block[2] = (a2 + b2) >> 8;
block[3] = (a3 + b3) >> 8;
block[4] = (a3 - b3) >> 8;
block[5] = (a2 - b2) >> 8;
block[6] = (a1 - b1) >> 8;
block[7] = (a0 - b0) >> 8;
}
static void inline idct_col (int16_t * const block)
{
int_fast32_t d0, d1, d2, d3;
int_fast32_t a0, a1, a2, a3, b0, b1, b2, b3;
int_fast32_t t0, t1, t2, t3;
d0 = (block[8*0] << 11) + 65536;
d1 = block[8*1];
d2 = block[8*2] << 11;
d3 = block[8*3];
t0 = d0 + d2;
t1 = d0 - d2;
BUTTERFLY (t2, t3, W6, W2, d3, d1);
a0 = t0 + t2;
a1 = t1 + t3;
a2 = t1 - t3;
a3 = t0 - t2;
d0 = block[8*4];
d1 = block[8*5];
d2 = block[8*6];
d3 = block[8*7];
BUTTERFLY (t0, t1, W7, W1, d3, d0);
BUTTERFLY (t2, t3, W3, W5, d1, d2);
b0 = t0 + t2;
b3 = t1 + t3;
t0 = (t0 - t2) >> 8;
t1 = (t1 - t3) >> 8;
b1 = (t0 + t1) * 181;
b2 = (t0 - t1) * 181;
block[8*0] = (a0 + b0) >> 17;
block[8*1] = (a1 + b1) >> 17;
block[8*2] = (a2 + b2) >> 17;
block[8*3] = (a3 + b3) >> 17;
block[8*4] = (a3 - b3) >> 17;
block[8*5] = (a2 - b2) >> 17;
block[8*6] = (a1 - b1) >> 17;
block[8*7] = (a0 - b0) >> 17;
}
void mpeg2_idct_copy_mvi (int16_t * block, uint8_t * dest, const int stride)
{
uint64_t clampmask;
int i;
for (i = 0; i < 8; i++)
idct_row (block + 8 * i);
for (i = 0; i < 8; i++)
idct_col (block + i);
clampmask = zap (-1, 0xaa); /* 0x00ff00ff00ff00ff */
do {
uint64_t shorts0, shorts1;
shorts0 = ldq (block);
shorts0 = maxsw4 (shorts0, 0);
shorts0 = minsw4 (shorts0, clampmask);
stl (pkwb (shorts0), dest);
shorts1 = ldq (block + 4);
shorts1 = maxsw4 (shorts1, 0);
shorts1 = minsw4 (shorts1, clampmask);
stl (pkwb (shorts1), dest + 4);
stq (0, block);
stq (0, block + 4);
dest += stride;
block += 8;
} while (--i);
}
void mpeg2_idct_add_mvi (const int last, int16_t * block,
uint8_t * dest, const int stride)
{
uint64_t clampmask;
uint64_t signmask;
int i;
if (last != 129 || (block[0] & 7) == 4) {
for (i = 0; i < 8; i++)
idct_row (block + 8 * i);
for (i = 0; i < 8; i++)
idct_col (block + i);
clampmask = zap (-1, 0xaa); /* 0x00ff00ff00ff00ff */
signmask = zap (-1, 0x33);
signmask ^= signmask >> 1; /* 0x8000800080008000 */
do {
uint64_t shorts0, pix0, signs0;
uint64_t shorts1, pix1, signs1;
shorts0 = ldq (block);
shorts1 = ldq (block + 4);
pix0 = unpkbw (ldl (dest));
/* signed subword add (MMX paddw). */
signs0 = shorts0 & signmask;
shorts0 &= ~signmask;
shorts0 += pix0;
shorts0 ^= signs0;
/* clamp. */
shorts0 = maxsw4 (shorts0, 0);
shorts0 = minsw4 (shorts0, clampmask);
/* next 4. */
pix1 = unpkbw (ldl (dest + 4));
signs1 = shorts1 & signmask;
shorts1 &= ~signmask;
shorts1 += pix1;
shorts1 ^= signs1;
shorts1 = maxsw4 (shorts1, 0);
shorts1 = minsw4 (shorts1, clampmask);
stl (pkwb (shorts0), dest);
stl (pkwb (shorts1), dest + 4);
stq (0, block);
stq (0, block + 4);
dest += stride;
block += 8;
} while (--i);
} else {
int DC;
uint64_t p0, p1, p2, p3, p4, p5, p6, p7;
uint64_t DCs;
DC = (block[0] + 4) >> 3;
block[0] = block[63] = 0;
p0 = ldq (dest + 0 * stride);
p1 = ldq (dest + 1 * stride);
p2 = ldq (dest + 2 * stride);
p3 = ldq (dest + 3 * stride);
p4 = ldq (dest + 4 * stride);
p5 = ldq (dest + 5 * stride);
p6 = ldq (dest + 6 * stride);
p7 = ldq (dest + 7 * stride);
if (DC > 0) {
DCs = BYTE_VEC (likely (DC <= 255) ? DC : 255);
p0 += minub8 (DCs, ~p0);
p1 += minub8 (DCs, ~p1);
p2 += minub8 (DCs, ~p2);
p3 += minub8 (DCs, ~p3);
p4 += minub8 (DCs, ~p4);
p5 += minub8 (DCs, ~p5);
p6 += minub8 (DCs, ~p6);
p7 += minub8 (DCs, ~p7);
} else {
DCs = BYTE_VEC (likely (-DC <= 255) ? -DC : 255);
p0 -= minub8 (DCs, p0);
p1 -= minub8 (DCs, p1);
p2 -= minub8 (DCs, p2);
p3 -= minub8 (DCs, p3);
p4 -= minub8 (DCs, p4);
p5 -= minub8 (DCs, p5);
p6 -= minub8 (DCs, p6);
p7 -= minub8 (DCs, p7);
}
stq (p0, dest + 0 * stride);
stq (p1, dest + 1 * stride);
stq (p2, dest + 2 * stride);
stq (p3, dest + 3 * stride);
stq (p4, dest + 4 * stride);
stq (p5, dest + 5 * stride);
stq (p6, dest + 6 * stride);
stq (p7, dest + 7 * stride);
}
}
void mpeg2_idct_copy_alpha (int16_t * block, uint8_t * dest, const int stride)
{
int i;
for (i = 0; i < 8; i++)
idct_row (block + 8 * i);
for (i = 0; i < 8; i++)
idct_col (block + i);
do {
dest[0] = CLIP (block[0]);
dest[1] = CLIP (block[1]);
dest[2] = CLIP (block[2]);
dest[3] = CLIP (block[3]);
dest[4] = CLIP (block[4]);
dest[5] = CLIP (block[5]);
dest[6] = CLIP (block[6]);
dest[7] = CLIP (block[7]);
stq(0, block);
stq(0, block + 4);
dest += stride;
block += 8;
} while (--i);
}
void mpeg2_idct_add_alpha (const int last, int16_t * block,
uint8_t * dest, const int stride)
{
int i;
if (last != 129 || (block[0] & 7) == 4) {
for (i = 0; i < 8; i++)
idct_row (block + 8 * i);
for (i = 0; i < 8; i++)
idct_col (block + i);
do {
dest[0] = CLIP (block[0] + dest[0]);
dest[1] = CLIP (block[1] + dest[1]);
dest[2] = CLIP (block[2] + dest[2]);
dest[3] = CLIP (block[3] + dest[3]);
dest[4] = CLIP (block[4] + dest[4]);
dest[5] = CLIP (block[5] + dest[5]);
dest[6] = CLIP (block[6] + dest[6]);
dest[7] = CLIP (block[7] + dest[7]);
stq(0, block);
stq(0, block + 4);
dest += stride;
block += 8;
} while (--i);
} else {
int DC;
DC = (block[0] + 4) >> 3;
block[0] = block[63] = 0;
i = 8;
do {
dest[0] = CLIP (DC + dest[0]);
dest[1] = CLIP (DC + dest[1]);
dest[2] = CLIP (DC + dest[2]);
dest[3] = CLIP (DC + dest[3]);
dest[4] = CLIP (DC + dest[4]);
dest[5] = CLIP (DC + dest[5]);
dest[6] = CLIP (DC + dest[6]);
dest[7] = CLIP (DC + dest[7]);
dest += stride;
} while (--i);
}
}
void mpeg2_idct_alpha_init(int no_mvi)
{
extern uint8_t mpeg2_scan_norm[64];
extern uint8_t mpeg2_scan_alt[64];
int i, j;
if (no_mvi)
for (i = -384; i < 640; i++)
clip_lut[i + 384] = (i < 0) ? 0 : ((i > 255) ? 255 : i);
for (i = 0; i < 64; i++) {
j = mpeg2_scan_norm[i];
mpeg2_scan_norm[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
j = mpeg2_scan_alt[i];
mpeg2_scan_alt[i] = ((j & 0x36) >> 1) | ((j & 0x09) << 2);
}
}
#endif /* ARCH_ALPHA */
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