355 lines
15 KiB
C
355 lines
15 KiB
C
/*
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* AltiVec-enhanced yuv2yuvX
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*
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* Copyright (C) 2004 Romain Dolbeau <romain@dolbeau.org>
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* based on the equivalent C code in swscale.c
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <inttypes.h>
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#include "config.h"
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#include "libswscale/swscale.h"
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#include "libswscale/swscale_internal.h"
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#include "libavutil/attributes.h"
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#include "libavutil/cpu.h"
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#include "yuv2rgb_altivec.h"
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#define vzero vec_splat_s32(0)
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static inline void altivec_packIntArrayToCharArray(int *val, uint8_t *dest,
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int dstW)
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{
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register int i;
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vector unsigned int altivec_vectorShiftInt19 =
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vec_add(vec_splat_u32(10), vec_splat_u32(9));
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if ((uintptr_t)dest % 16) {
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/* badly aligned store, we force store alignment */
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/* and will handle load misalignment on val w/ vec_perm */
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vector unsigned char perm1;
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vector signed int v1;
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for (i = 0; (i < dstW) &&
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(((uintptr_t)dest + i) % 16); i++) {
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int t = val[i] >> 19;
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dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
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}
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perm1 = vec_lvsl(i << 2, val);
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v1 = vec_ld(i << 2, val);
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for (; i < (dstW - 15); i += 16) {
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int offset = i << 2;
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vector signed int v2 = vec_ld(offset + 16, val);
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vector signed int v3 = vec_ld(offset + 32, val);
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vector signed int v4 = vec_ld(offset + 48, val);
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vector signed int v5 = vec_ld(offset + 64, val);
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vector signed int v12 = vec_perm(v1, v2, perm1);
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vector signed int v23 = vec_perm(v2, v3, perm1);
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vector signed int v34 = vec_perm(v3, v4, perm1);
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vector signed int v45 = vec_perm(v4, v5, perm1);
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vector signed int vA = vec_sra(v12, altivec_vectorShiftInt19);
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vector signed int vB = vec_sra(v23, altivec_vectorShiftInt19);
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vector signed int vC = vec_sra(v34, altivec_vectorShiftInt19);
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vector signed int vD = vec_sra(v45, altivec_vectorShiftInt19);
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vector unsigned short vs1 = vec_packsu(vA, vB);
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vector unsigned short vs2 = vec_packsu(vC, vD);
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vector unsigned char vf = vec_packsu(vs1, vs2);
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vec_st(vf, i, dest);
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v1 = v5;
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}
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} else { // dest is properly aligned, great
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for (i = 0; i < (dstW - 15); i += 16) {
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int offset = i << 2;
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vector signed int v1 = vec_ld(offset, val);
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vector signed int v2 = vec_ld(offset + 16, val);
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vector signed int v3 = vec_ld(offset + 32, val);
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vector signed int v4 = vec_ld(offset + 48, val);
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vector signed int v5 = vec_sra(v1, altivec_vectorShiftInt19);
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vector signed int v6 = vec_sra(v2, altivec_vectorShiftInt19);
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vector signed int v7 = vec_sra(v3, altivec_vectorShiftInt19);
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vector signed int v8 = vec_sra(v4, altivec_vectorShiftInt19);
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vector unsigned short vs1 = vec_packsu(v5, v6);
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vector unsigned short vs2 = vec_packsu(v7, v8);
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vector unsigned char vf = vec_packsu(vs1, vs2);
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vec_st(vf, i, dest);
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}
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}
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for (; i < dstW; i++) {
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int t = val[i] >> 19;
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dest[i] = (t < 0) ? 0 : ((t > 255) ? 255 : t);
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}
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}
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// FIXME remove the usage of scratch buffers.
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static void yuv2planeX_altivec(const int16_t *filter, int filterSize,
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const int16_t **src, uint8_t *dest, int dstW,
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const uint8_t *dither, int offset)
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{
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register int i, j;
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DECLARE_ALIGNED(16, int, val)[dstW];
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for (i = 0; i < dstW; i++)
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val[i] = dither[(i + offset) & 7] << 12;
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for (j = 0; j < filterSize; j++) {
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vector signed short l1, vLumFilter = vec_ld(j << 1, filter);
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vector unsigned char perm, perm0 = vec_lvsl(j << 1, filter);
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vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
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vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter
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perm = vec_lvsl(0, src[j]);
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l1 = vec_ld(0, src[j]);
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for (i = 0; i < (dstW - 7); i += 8) {
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int offset = i << 2;
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vector signed short l2 = vec_ld((i << 1) + 16, src[j]);
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vector signed int v1 = vec_ld(offset, val);
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vector signed int v2 = vec_ld(offset + 16, val);
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vector signed short ls = vec_perm(l1, l2, perm); // lumSrc[j][i] ... lumSrc[j][i+7]
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vector signed int i1 = vec_mule(vLumFilter, ls);
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vector signed int i2 = vec_mulo(vLumFilter, ls);
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vector signed int vf1 = vec_mergeh(i1, i2);
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vector signed int vf2 = vec_mergel(i1, i2); // lumSrc[j][i] * lumFilter[j] ... lumSrc[j][i+7] * lumFilter[j]
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vector signed int vo1 = vec_add(v1, vf1);
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vector signed int vo2 = vec_add(v2, vf2);
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vec_st(vo1, offset, val);
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vec_st(vo2, offset + 16, val);
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l1 = l2;
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}
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for (; i < dstW; i++)
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val[i] += src[j][i] * filter[j];
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}
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altivec_packIntArrayToCharArray(val, dest, dstW);
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}
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static void hScale_altivec_real(SwsContext *c, int16_t *dst, int dstW,
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const uint8_t *src, const int16_t *filter,
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const int32_t *filterPos, int filterSize)
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{
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register int i;
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DECLARE_ALIGNED(16, int, tempo)[4];
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if (filterSize % 4) {
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for (i = 0; i < dstW; i++) {
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register int j;
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register int srcPos = filterPos[i];
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register int val = 0;
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for (j = 0; j < filterSize; j++)
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val += ((int)src[srcPos + j]) * filter[filterSize * i + j];
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dst[i] = FFMIN(val >> 7, (1 << 15) - 1);
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}
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} else
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switch (filterSize) {
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case 4:
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for (i = 0; i < dstW; i++) {
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register int srcPos = filterPos[i];
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vector unsigned char src_v0 = vec_ld(srcPos, src);
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vector unsigned char src_v1, src_vF;
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vector signed short src_v, filter_v;
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vector signed int val_vEven, val_s;
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if ((((uintptr_t)src + srcPos) % 16) > 12) {
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src_v1 = vec_ld(srcPos + 16, src);
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}
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src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
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src_v = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
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// now put our elements in the even slots
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src_v = vec_mergeh(src_v, (vector signed short)vzero);
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filter_v = vec_ld(i << 3, filter);
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// The 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2).
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// The neat trick: We only care for half the elements,
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// high or low depending on (i<<3)%16 (it's 0 or 8 here),
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// and we're going to use vec_mule, so we choose
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// carefully how to "unpack" the elements into the even slots.
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if ((i << 3) % 16)
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filter_v = vec_mergel(filter_v, (vector signed short)vzero);
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else
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filter_v = vec_mergeh(filter_v, (vector signed short)vzero);
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val_vEven = vec_mule(src_v, filter_v);
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val_s = vec_sums(val_vEven, vzero);
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vec_st(val_s, 0, tempo);
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dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
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}
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break;
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case 8:
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for (i = 0; i < dstW; i++) {
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register int srcPos = filterPos[i];
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vector unsigned char src_v0 = vec_ld(srcPos, src);
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vector unsigned char src_v1, src_vF;
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vector signed short src_v, filter_v;
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vector signed int val_v, val_s;
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if ((((uintptr_t)src + srcPos) % 16) > 8) {
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src_v1 = vec_ld(srcPos + 16, src);
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}
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src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
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src_v = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
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filter_v = vec_ld(i << 4, filter);
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// the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
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val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
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val_s = vec_sums(val_v, vzero);
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vec_st(val_s, 0, tempo);
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dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
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}
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break;
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case 16:
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for (i = 0; i < dstW; i++) {
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register int srcPos = filterPos[i];
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vector unsigned char src_v0 = vec_ld(srcPos, src);
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vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
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vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
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vector signed short src_vA = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
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vector signed short src_vB = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
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vector signed short filter_v0 = vec_ld(i << 5, filter);
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vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
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// the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
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vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
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vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
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vector signed int val_s = vec_sums(val_v, vzero);
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vec_st(val_s, 0, tempo);
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dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
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}
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break;
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default:
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for (i = 0; i < dstW; i++) {
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register int j;
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register int srcPos = filterPos[i];
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vector signed int val_s, val_v = (vector signed int)vzero;
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vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
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vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
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vector unsigned char src_v0 = vec_ld(srcPos, src);
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vector unsigned char permS = vec_lvsl(srcPos, src);
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for (j = 0; j < filterSize - 15; j += 16) {
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vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
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vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
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vector signed short src_vA = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
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vector signed short src_vB = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
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vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
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vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
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vector signed short filter_v0 = vec_perm(filter_v0R, filter_v1R, permF);
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vector signed short filter_v1 = vec_perm(filter_v1R, filter_v2R, permF);
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vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
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val_v = vec_msums(src_vB, filter_v1, val_acc);
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filter_v0R = filter_v2R;
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src_v0 = src_v1;
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}
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if (j < filterSize - 7) {
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// loading src_v0 is useless, it's already done above
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// vector unsigned char src_v0 = vec_ld(srcPos + j, src);
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vector unsigned char src_v1, src_vF;
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vector signed short src_v, filter_v1R, filter_v;
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if ((((uintptr_t)src + srcPos) % 16) > 8) {
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src_v1 = vec_ld(srcPos + j + 16, src);
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}
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src_vF = vec_perm(src_v0, src_v1, permS);
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src_v = // vec_unpackh sign-extends...
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(vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
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// loading filter_v0R is useless, it's already done above
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// vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
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filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
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filter_v = vec_perm(filter_v0R, filter_v1R, permF);
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val_v = vec_msums(src_v, filter_v, val_v);
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}
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val_s = vec_sums(val_v, vzero);
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vec_st(val_s, 0, tempo);
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dst[i] = FFMIN(tempo[3] >> 7, (1 << 15) - 1);
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}
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}
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}
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av_cold void ff_sws_init_swScale_altivec(SwsContext *c)
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{
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enum PixelFormat dstFormat = c->dstFormat;
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if (!(av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC))
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return;
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if (c->srcBpc == 8 && c->dstBpc <= 10) {
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c->hyScale = c->hcScale = hScale_altivec_real;
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}
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if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
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dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
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!c->alpPixBuf) {
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c->yuv2planeX = yuv2planeX_altivec;
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}
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/* The following list of supported dstFormat values should
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* match what's found in the body of ff_yuv2packedX_altivec() */
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if (!(c->flags & (SWS_BITEXACT | SWS_FULL_CHR_H_INT)) && !c->alpPixBuf) {
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switch (c->dstFormat) {
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case PIX_FMT_ABGR:
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c->yuv2packedX = ff_yuv2abgr_X_altivec;
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break;
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case PIX_FMT_BGRA:
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c->yuv2packedX = ff_yuv2bgra_X_altivec;
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break;
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case PIX_FMT_ARGB:
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c->yuv2packedX = ff_yuv2argb_X_altivec;
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break;
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case PIX_FMT_RGBA:
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c->yuv2packedX = ff_yuv2rgba_X_altivec;
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break;
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case PIX_FMT_BGR24:
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c->yuv2packedX = ff_yuv2bgr24_X_altivec;
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break;
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case PIX_FMT_RGB24:
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c->yuv2packedX = ff_yuv2rgb24_X_altivec;
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break;
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}
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}
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}
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