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ffmpeg/libswscale/ppc/swscale_altivec.c
Sergey Lavrushkin 582bc5a348 libswscale: Adds conversions from/to float gray format. 
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2018-08-14 18:22:39 +02:00

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/*
* 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/attributes.h"
#include "libavutil/cpu.h"
#include "yuv2rgb_altivec.h"
#include "libavutil/ppc/util_altivec.h"
#if HAVE_ALTIVEC
#define vzero vec_splat_s32(0)
#if HAVE_BIGENDIAN
#define GET_LS(a,b,c,s) {\
vector signed short l2 = vec_ld(((b) << 1) + 16, s);\
ls = vec_perm(a, l2, c);\
a = l2;\
}
#else
#define GET_LS(a,b,c,s) {\
ls = a;\
a = vec_vsx_ld(((b) << 1) + 16, s);\
}
#endif
#define yuv2planeX_8(d1, d2, l1, src, x, perm, filter) do {\
vector signed short ls;\
GET_LS(l1, x, perm, src);\
vector signed int i1 = vec_mule(filter, ls);\
vector signed int i2 = vec_mulo(filter, ls);\
vector signed int vf1, vf2;\
vf1 = vec_mergeh(i1, i2);\
vf2 = vec_mergel(i1, i2);\
d1 = vec_add(d1, vf1);\
d2 = vec_add(d2, vf2);\
} while (0)
#if HAVE_BIGENDIAN
#define LOAD_FILTER(vf,f) {\
vector unsigned char perm0 = vec_lvsl(joffset, f);\
vf = vec_ld(joffset, f);\
vf = vec_perm(vf, vf, perm0);\
}
#define LOAD_L1(ll1,s,p){\
p = vec_lvsl(xoffset, s);\
ll1 = vec_ld(xoffset, s);\
}
#else
#define LOAD_FILTER(vf,f) {\
vf = vec_vsx_ld(joffset, f);\
}
#define LOAD_L1(ll1,s,p){\
ll1 = vec_vsx_ld(xoffset, s);\
}
#endif
static void yuv2planeX_16_altivec(const int16_t *filter, int filterSize,
const int16_t **src, uint8_t *dest,
const uint8_t *dither, int offset, int x)
{
register int i, j;
LOCAL_ALIGNED(16, int, val, [16]);
vector signed int vo1, vo2, vo3, vo4;
vector unsigned short vs1, vs2;
vector unsigned char vf;
vector unsigned int altivec_vectorShiftInt19 =
vec_add(vec_splat_u32(10), vec_splat_u32(9));
for (i = 0; i < 16; i++)
val[i] = dither[(x + i + offset) & 7] << 12;
vo1 = vec_ld(0, val);
vo2 = vec_ld(16, val);
vo3 = vec_ld(32, val);
vo4 = vec_ld(48, val);
for (j = 0; j < filterSize; j++) {
unsigned int joffset=j<<1;
unsigned int xoffset=x<<1;
vector unsigned char perm;
vector signed short l1,vLumFilter;
LOAD_FILTER(vLumFilter,filter);
vLumFilter = vec_splat(vLumFilter, 0);
LOAD_L1(l1,src[j],perm);
yuv2planeX_8(vo1, vo2, l1, src[j], x, perm, vLumFilter);
yuv2planeX_8(vo3, vo4, l1, src[j], x + 8, perm, vLumFilter);
}
vo1 = vec_sra(vo1, altivec_vectorShiftInt19);
vo2 = vec_sra(vo2, altivec_vectorShiftInt19);
vo3 = vec_sra(vo3, altivec_vectorShiftInt19);
vo4 = vec_sra(vo4, altivec_vectorShiftInt19);
vs1 = vec_packsu(vo1, vo2);
vs2 = vec_packsu(vo3, vo4);
vf = vec_packsu(vs1, vs2);
VEC_ST(vf, 0, dest);
}
static inline void yuv2planeX_u(const int16_t *filter, int filterSize,
const int16_t **src, uint8_t *dest, int dstW,
const uint8_t *dither, int offset, int x)
{
int i, j;
for (i = x; i < dstW; i++) {
int t = dither[(i + offset) & 7] << 12;
for (j = 0; j < filterSize; j++)
t += src[j][i] * filter[j];
dest[i] = av_clip_uint8(t >> 19);
}
}
static void yuv2planeX_altivec(const int16_t *filter, int filterSize,
const int16_t **src, uint8_t *dest, int dstW,
const uint8_t *dither, int offset)
{
int dst_u = -(uintptr_t)dest & 15;
int i;
yuv2planeX_u(filter, filterSize, src, dest, dst_u, dither, offset, 0);
for (i = dst_u; i < dstW - 15; i += 16)
yuv2planeX_16_altivec(filter, filterSize, src, dest + i, dither,
offset, i);
yuv2planeX_u(filter, filterSize, src, dest, dstW, dither, offset, i);
}
#if HAVE_BIGENDIAN
// 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.
#define GET_VF4(a, vf, f) {\
vf = vec_ld(a<< 3, f);\
if ((a << 3) % 16)\
vf = vec_mergel(vf, (vector signed short)vzero);\
else\
vf = vec_mergeh(vf, (vector signed short)vzero);\
}
#define FIRST_LOAD(sv, pos, s, per) {\
sv = vec_ld(pos, s);\
per = vec_lvsl(pos, s);\
}
#define UPDATE_PTR(s0, d0, s1, d1) {\
d0 = s0;\
d1 = s1;\
}
#define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
v1 = vec_ld(pos + a + 16, s);\
vf = vec_perm(v0, v1, per);\
}
#define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) {\
if ((((uintptr_t)s + pos) % 16) > 8) {\
v1 = vec_ld(pos + a + 16, s);\
}\
vf = vec_perm(v0, src_v1, per);\
}
#define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
vf1 = vec_ld((a * 2 * filterSize) + (b * 2) + 16 + off, f);\
vf = vec_perm(vf0, vf1, per);\
}
#else /* else of #if HAVE_BIGENDIAN */
#define GET_VF4(a, vf, f) {\
vf = (vector signed short)vec_vsx_ld(a << 3, f);\
vf = vec_mergeh(vf, (vector signed short)vzero);\
}
#define FIRST_LOAD(sv, pos, s, per) {}
#define UPDATE_PTR(s0, d0, s1, d1) {}
#define LOAD_SRCV(pos, a, s, per, v0, v1, vf) {\
vf = vec_vsx_ld(pos + a, s);\
}
#define LOAD_SRCV8(pos, a, s, per, v0, v1, vf) LOAD_SRCV(pos, a, s, per, v0, v1, vf)
#define GET_VFD(a, b, f, vf0, vf1, per, vf, off) {\
vf = vec_vsx_ld((a * 2 * filterSize) + (b * 2) + off, f);\
}
#endif /* end of #if HAVE_BIGENDIAN */
static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW,
const uint8_t *src, const int16_t *filter,
const int32_t *filterPos, int filterSize)
{
register int i;
LOCAL_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_vF = unaligned_load(srcPos, src);
vector signed short src_v, filter_v;
vector signed int val_vEven, val_s;
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);
GET_VF4(i, filter_v, filter);
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_vF, src_v0, src_v1;
vector unsigned char permS;
vector signed short src_v, filter_v;
vector signed int val_v, val_s;
FIRST_LOAD(src_v0, srcPos, src, permS);
LOAD_SRCV8(srcPos, 0, src, permS, src_v0, src_v1, src_vF);
src_v = // vec_unpackh sign-extends...
(vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
filter_v = vec_ld(i << 4, filter);
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_vF = unaligned_load(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);
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, offset = i * 2 * filterSize;
register int srcPos = filterPos[i];
vector signed int val_s, val_v = (vector signed int)vzero;
vector signed short filter_v0R;
vector unsigned char permF, src_v0, permS;
FIRST_LOAD(filter_v0R, offset, filter, permF);
FIRST_LOAD(src_v0, srcPos, src, permS);
for (j = 0; j < filterSize - 15; j += 16) {
vector unsigned char src_v1, src_vF;
vector signed short filter_v1R, filter_v2R, filter_v0, filter_v1;
LOAD_SRCV(srcPos, j, src, permS, src_v0, src_v1, src_vF);
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));
GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v0, 0);
GET_VFD(i, j, filter, filter_v1R, filter_v2R, permF, filter_v1, 16);
vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
val_v = vec_msums(src_vB, filter_v1, val_acc);
UPDATE_PTR(filter_v2R, filter_v0R, src_v1, src_v0);
}
if (j < filterSize - 7) {
// loading src_v0 is useless, it's already done above
vector unsigned char src_v1, src_vF;
vector signed short src_v, filter_v1R, filter_v;
LOAD_SRCV8(srcPos, j, src, permS, src_v0, src_v1, src_vF);
src_v = // vec_unpackh sign-extends...
(vector signed short)(VEC_MERGEH((vector unsigned char)vzero, src_vF));
GET_VFD(i, j, filter, filter_v0R, filter_v1R, permF, filter_v, 0);
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);
}
}
}
#endif /* HAVE_ALTIVEC */
av_cold void ff_sws_init_swscale_ppc(SwsContext *c)
{
#if HAVE_ALTIVEC
enum AVPixelFormat dstFormat = c->dstFormat;
if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
return;
if (c->srcBpc == 8 && c->dstBpc <= 14) {
c->hyScale = c->hcScale = hScale_altivec_real;
}
if (!is16BPS(dstFormat) && !isNBPS(dstFormat) &&
dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
dstFormat != AV_PIX_FMT_GRAYF32BE && dstFormat != AV_PIX_FMT_GRAYF32LE &&
!c->needAlpha) {
c->yuv2planeX = yuv2planeX_altivec;
}
/* 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->needAlpha) {
switch (c->dstFormat) {
case AV_PIX_FMT_ABGR:
c->yuv2packedX = ff_yuv2abgr_X_altivec;
break;
case AV_PIX_FMT_BGRA:
c->yuv2packedX = ff_yuv2bgra_X_altivec;
break;
case AV_PIX_FMT_ARGB:
c->yuv2packedX = ff_yuv2argb_X_altivec;
break;
case AV_PIX_FMT_RGBA:
c->yuv2packedX = ff_yuv2rgba_X_altivec;
break;
case AV_PIX_FMT_BGR24:
c->yuv2packedX = ff_yuv2bgr24_X_altivec;
break;
case AV_PIX_FMT_RGB24:
c->yuv2packedX = ff_yuv2rgb24_X_altivec;
break;
}
}
#endif /* HAVE_ALTIVEC */
}
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