/*
* AltiVec-enhanced yuv2yuvX
*
* Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
* based on the equivalent C code in swscale.c
*
* 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 <inttypes.h>
#include "config.h"
#include "libswscale/swscale.h"
#include "libswscale/swscale_internal.h"
#include "libavutil/cpu.h"
#include "yuv2rgb_altivec.h"
#define vzero vec_splat_s32(0)
static inline void
altivec_packIntArrayToCharArray(int *val, uint8_t* dest, int dstW)
{
register int i;
vector unsigned int altivec_vectorShiftInt19 =
vec_add(vec_splat_u32(10), vec_splat_u32(9));
if ((uintptr_t)dest % 16) {
/* badly aligned store, we force store alignment */
/* and will handle load misalignment on val w/ vec_perm */
vector unsigned char perm1;
vector signed int v1;
for (i = 0 ; (i < dstW) &&
(((uintptr_t)dest + i) % 16) ; i++) {
int t = val[i] >> 19;
dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
}
perm1 = vec_lvsl(i << 2, val);
v1 = vec_ld(i << 2, val);
for ( ; i < (dstW - 15); i+=16) {
int offset = i << 2;
vector signed int v2 = vec_ld(offset + 16, val);
vector signed int v3 = vec_ld(offset + 32, val);
vector signed int v4 = vec_ld(offset + 48, val);
vector signed int v5 = vec_ld(offset + 64, val);
vector signed int v12 = vec_perm(v1, v2, perm1);
vector signed int v23 = vec_perm(v2, v3, perm1);
vector signed int v34 = vec_perm(v3, v4, perm1);
vector signed int v45 = vec_perm(v4, v5, perm1);
vector signed int vA = vec_sra(v12, altivec_vectorShiftInt19);
vector signed int vB = vec_sra(v23, altivec_vectorShiftInt19);
vector signed int vC = vec_sra(v34, altivec_vectorShiftInt19);
vector signed int vD = vec_sra(v45, altivec_vectorShiftInt19);
vector unsigned short vs1 = vec_packsu(vA, vB);
vector unsigned short vs2 = vec_packsu(vC, vD);
vector unsigned char vf = vec_packsu(vs1, vs2);
vec_st(vf, i, dest);
v1 = v5;
}
} else { // dest is properly aligned, great
for (i = 0; i < (dstW - 15); i+=16) {
int offset = i << 2;
vector signed int v1 = vec_ld(offset, val);
vector signed int v2 = vec_ld(offset + 16, val);
vector signed int v3 = vec_ld(offset + 32, val);
vector signed int v4 = vec_ld(offset + 48, val);
vector signed int v5 = vec_sra(v1, altivec_vectorShiftInt19);
vector signed int v6 = vec_sra(v2, altivec_vectorShiftInt19);
vector signed int v7 = vec_sra(v3, altivec_vectorShiftInt19);
vector signed int v8 = vec_sra(v4, altivec_vectorShiftInt19);
vector unsigned short vs1 = vec_packsu(v5, v6);
vector unsigned short vs2 = vec_packsu(v7, v8);
vector unsigned char vf = vec_packsu(vs1, vs2);
vec_st(vf, i, dest);
}
}
for ( ; i < dstW ; i++) {
int t = val[i] >> 19;
dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
}
}
static void
yuv2yuvX_altivec_real(SwsContext *c,
const int16_t *lumFilter, const int16_t **lumSrc,
int lumFilterSize, const int16_t *chrFilter,
const int16_t **chrUSrc, const int16_t **chrVSrc,
int chrFilterSize, const int16_t **alpSrc,
uint8_t *dest, uint8_t *uDest,
uint8_t *vDest, uint8_t *aDest,
int dstW, int chrDstW)
{
const vector signed int vini = {(1 << 18), (1 << 18), (1 << 18), (1 << 18)};
register int i, j;
{
DECLARE_ALIGNED(16, int, val)[dstW];
for (i = 0; i < (dstW -7); i+=4) {
vec_st(vini, i << 2, val);
}
for (; i < dstW; i++) {
val[i] = (1 << 18);
}
for (j = 0; j < lumFilterSize; j++) {
vector signed short l1, vLumFilter = vec_ld(j << 1, lumFilter);
vector unsigned char perm, perm0 = vec_lvsl(j << 1, lumFilter);
vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter
perm = vec_lvsl(0, lumSrc[j]);
l1 = vec_ld(0, lumSrc[j]);
for (i = 0; i < (dstW - 7); i+=8) {
int offset = i << 2;
vector signed short l2 = vec_ld((i << 1) + 16, lumSrc[j]);
vector signed int v1 = vec_ld(offset, val);
vector signed int v2 = vec_ld(offset + 16, val);
vector signed short ls = vec_perm(l1, l2, perm); // lumSrc[j][i] ... lumSrc[j][i+7]
vector signed int i1 = vec_mule(vLumFilter, ls);
vector signed int i2 = vec_mulo(vLumFilter, ls);
vector signed int vf1 = vec_mergeh(i1, i2);
vector signed int vf2 = vec_mergel(i1, i2); // lumSrc[j][i] * lumFilter[j] ... lumSrc[j][i+7] * lumFilter[j]
vector signed int vo1 = vec_add(v1, vf1);
vector signed int vo2 = vec_add(v2, vf2);
vec_st(vo1, offset, val);
vec_st(vo2, offset + 16, val);
l1 = l2;
}
for ( ; i < dstW; i++) {
val[i] += lumSrc[j][i] * lumFilter[j];
}
}
altivec_packIntArrayToCharArray(val, dest, dstW);
}
if (uDest != 0) {
DECLARE_ALIGNED(16, int, u)[chrDstW];
DECLARE_ALIGNED(16, int, v)[chrDstW];
for (i = 0; i < (chrDstW -7); i+=4) {
vec_st(vini, i << 2, u);
vec_st(vini, i << 2, v);
}
for (; i < chrDstW; i++) {
u[i] = (1 << 18);
v[i] = (1 << 18);
}
for (j = 0; j < chrFilterSize; j++) {
vector signed short l1, l1_V, vChrFilter = vec_ld(j << 1, chrFilter);
vector unsigned char perm, perm0 = vec_lvsl(j << 1, chrFilter);
vChrFilter = vec_perm(vChrFilter, vChrFilter, perm0);
vChrFilter = vec_splat(vChrFilter, 0); // chrFilter[j] is loaded 8 times in vChrFilter
perm = vec_lvsl(0, chrUSrc[j]);
l1 = vec_ld(0, chrUSrc[j]);
l1_V = vec_ld(0, chrVSrc[j]);
for (i = 0; i < (chrDstW - 7); i+=8) {
int offset = i << 2;
vector signed short l2 = vec_ld((i << 1) + 16, chrUSrc[j]);
vector signed short l2_V = vec_ld((i << 1) + 16, chrVSrc[j]);
vector signed int v1 = vec_ld(offset, u);
vector signed int v2 = vec_ld(offset + 16, u);
vector signed int v1_V = vec_ld(offset, v);
vector signed int v2_V = vec_ld(offset + 16, v);
vector signed short ls = vec_perm(l1, l2, perm); // chrUSrc[j][i] ... chrUSrc[j][i+7]
vector signed short ls_V = vec_perm(l1_V, l2_V, perm); // chrVSrc[j][i] ... chrVSrc[j][i]
vector signed int i1 = vec_mule(vChrFilter, ls);
vector signed int i2 = vec_mulo(vChrFilter, ls);
vector signed int i1_V = vec_mule(vChrFilter, ls_V);
vector signed int i2_V = vec_mulo(vChrFilter, ls_V);
vector signed int vf1 = vec_mergeh(i1, i2);
vector signed int vf2 = vec_mergel(i1, i2); // chrUSrc[j][i] * chrFilter[j] ... chrUSrc[j][i+7] * chrFilter[j]
vector signed int vf1_V = vec_mergeh(i1_V, i2_V);
vector signed int vf2_V = vec_mergel(i1_V, i2_V); // chrVSrc[j][i] * chrFilter[j] ... chrVSrc[j][i+7] * chrFilter[j]
vector signed int vo1 = vec_add(v1, vf1);
vector signed int vo2 = vec_add(v2, vf2);
vector signed int vo1_V = vec_add(v1_V, vf1_V);
vector signed int vo2_V = vec_add(v2_V, vf2_V);
vec_st(vo1, offset, u);
vec_st(vo2, offset + 16, u);
vec_st(vo1_V, offset, v);
vec_st(vo2_V, offset + 16, v);
l1 = l2;
l1_V = l2_V;
}
for ( ; i < chrDstW; i++) {
u[i] += chrUSrc[j][i] * chrFilter[j];
v[i] += chrVSrc[j][i] * chrFilter[j];
}
}
altivec_packIntArrayToCharArray(u, uDest, chrDstW);
altivec_packIntArrayToCharArray(v, vDest, chrDstW);
}
}
static void hScale_altivec_real(int16_t *dst, int dstW,
const uint8_t *src, int srcW,
int xInc, const int16_t *filter,
const int16_t *filterPos, int filterSize)
{
register int i;
DECLARE_ALIGNED(16, int, tempo)[4];
if (filterSize % 4) {
for (i=0; i<dstW; i++) {
register int j;
register int srcPos = filterPos[i];
register int val = 0;
for (j=0; j<filterSize; j++) {
val += ((int)src[srcPos + j])*filter[filterSize*i + j];
}
dst[i] = FFMIN(val>>7, (1<<15)-1);
}
}
else
switch (filterSize) {
case 4:
{
for (i=0; i<dstW; i++) {
register int srcPos = filterPos[i];
vector unsigned char src_v0 = vec_ld(srcPos, src);
vector unsigned char src_v1, src_vF;
vector signed short src_v, filter_v;
vector signed int val_vEven, val_s;
if ((((uintptr_t)src + srcPos) % 16) > 12) {
src_v1 = vec_ld(srcPos + 16, src);
}
src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
src_v = // vec_unpackh sign-extends...
(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
// now put our elements in the even slots
src_v = vec_mergeh(src_v, (vector signed short)vzero);
filter_v = vec_ld(i << 3, filter);
// The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
// The neat trick: We only care for half the elements,
// high or low depending on (i<<3)%16 (it's 0 or 8 here),
// and we're going to use vec_mule, so we choose
// carefully how to "unpack" the elements into the even slots.
if ((i << 3) % 16)
filter_v = vec_mergel(filter_v, (vector signed short)vzero);
else
filter_v = vec_mergeh(filter_v, (vector signed short)vzero);
val_vEven = vec_mule(src_v, filter_v);
val_s = vec_sums(val_vEven, vzero);
vec_st(val_s, 0, tempo);
dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
}
}
break;
case 8:
{
for (i=0; i<dstW; i++) {
register int srcPos = filterPos[i];
vector unsigned char src_v0 = vec_ld(srcPos, src);
vector unsigned char src_v1, src_vF;
vector signed short src_v, filter_v;
vector signed int val_v, val_s;
if ((((uintptr_t)src + srcPos) % 16) > 8) {
src_v1 = vec_ld(srcPos + 16, src);
}
src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
src_v = // vec_unpackh sign-extends...
(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
filter_v = vec_ld(i << 4, filter);
// the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
val_s = vec_sums(val_v, vzero);
vec_st(val_s, 0, tempo);
dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
}
}
break;
case 16:
{
for (i=0; i<dstW; i++) {
register int srcPos = filterPos[i];
vector unsigned char src_v0 = vec_ld(srcPos, src);
vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
vector signed short src_vA = // vec_unpackh sign-extends...
(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
vector signed short src_vB = // vec_unpackh sign-extends...
(vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
vector signed short filter_v0 = vec_ld(i << 5, filter);
vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
// the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
vector signed int val_s = vec_sums(val_v, vzero);
vec_st(val_s, 0, tempo);
dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
}
}
break;
default:
{
for (i=0; i<dstW; i++) {
register int j;
register int srcPos = filterPos[i];
vector signed int val_s, val_v = (vector signed int)vzero;
vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
vector unsigned char src_v0 = vec_ld(srcPos, src);
vector unsigned char permS = vec_lvsl(srcPos, src);
for (j = 0 ; j < filterSize - 15; j += 16) {
vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
vector signed short src_vA = // vec_unpackh sign-extends...
(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
vector signed short src_vB = // vec_unpackh sign-extends...
(vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
vector signed short filter_v0 = vec_perm(filter_v0R, filter_v1R, permF);
vector signed short filter_v1 = vec_perm(filter_v1R, filter_v2R, permF);
vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
val_v = vec_msums(src_vB, filter_v1, val_acc);
filter_v0R = filter_v2R;
src_v0 = src_v1;
}
if (j < filterSize-7) {
// loading src_v0 is useless, it's already done above
//vector unsigned char src_v0 = vec_ld(srcPos + j, src);
vector unsigned char src_v1, src_vF;
vector signed short src_v, filter_v1R, filter_v;
if ((((uintptr_t)src + srcPos) % 16) > 8) {
src_v1 = vec_ld(srcPos + j + 16, src);
}
src_vF = vec_perm(src_v0, src_v1, permS);
src_v = // vec_unpackh sign-extends...
(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
// loading filter_v0R is useless, it's already done above
//vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
filter_v = vec_perm(filter_v0R, filter_v1R, permF);
val_v = vec_msums(src_v, filter_v, val_v);
}
val_s = vec_sums(val_v, vzero);
vec_st(val_s, 0, tempo);
dst[i] = FFMIN(tempo[3]>>7, (1<<15)-1);
}
}
}
}
void ff_sws_init_swScale_altivec(SwsContext *c)
{
enum PixelFormat dstFormat = c->dstFormat;
if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
return;
c->hScale = hScale_altivec_real;
if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat)) {
c->yuv2yuvX = yuv2yuvX_altivec_real;
}
/* The following list of supported dstFormat values should
* match what's found in the body of ff_yuv2packedX_altivec() */
if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf &&
(c->dstFormat==PIX_FMT_ABGR || c->dstFormat==PIX_FMT_BGRA ||
c->dstFormat==PIX_FMT_BGR24 || c->dstFormat==PIX_FMT_RGB24 ||
c->dstFormat==PIX_FMT_RGBA || c->dstFormat==PIX_FMT_ARGB)) {
c->yuv2packedX = ff_yuv2packedX_altivec;
}
}