libswscale/ppc/swscale_altivec.c - third_party/ffmpeg - Git at Google

 /*
  * 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);
     }
 }

 //FIXME remove the usage of scratch buffers.
 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)
 {
     register int i, j;
         DECLARE_ALIGNED(16, int, val)[dstW];

         for (i=0; i<dstW; i++)
             val[i] = dither[(i + offset) & 7] << 12;

         for (j = 0; j < filterSize; j++) {
             vector signed short l1, vLumFilter = vec_ld(j << 1, filter);
             vector unsigned char perm, perm0 = vec_lvsl(j << 1, filter);
             vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
             vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter

             perm = vec_lvsl(0, src[j]);
             l1 = vec_ld(0, src[j]);

             for (i = 0; i < (dstW - 7); i+=8) {
                 int offset = i << 2;
                 vector signed short l2 = vec_ld((i << 1) + 16, src[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] += src[j][i] * filter[j];
             }
         }
         altivec_packIntArrayToCharArray(val, dest, dstW);
 }

 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;
     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;

     if (c->srcBpc == 8 && c->dstBpc <= 10) {
         c->hyScale = c->hcScale = hScale_altivec_real;
     }
     if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
         dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
         !c->alpPixBuf) {
         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->alpPixBuf) {
         switch (c->dstFormat) {
         case PIX_FMT_ABGR:  c->yuv2packedX = ff_yuv2abgr_X_altivec;  break;
         case PIX_FMT_BGRA:  c->yuv2packedX = ff_yuv2bgra_X_altivec;  break;
         case PIX_FMT_ARGB:  c->yuv2packedX = ff_yuv2argb_X_altivec;  break;
         case PIX_FMT_RGBA:  c->yuv2packedX = ff_yuv2rgba_X_altivec;  break;
         case PIX_FMT_BGR24: c->yuv2packedX = ff_yuv2bgr24_X_altivec; break;
         case PIX_FMT_RGB24: c->yuv2packedX = ff_yuv2rgb24_X_altivec; break;
         }
     }
 }
	/*
	* 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);
	}
	}

	//FIXME remove the usage of scratch buffers.
	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)
	{
	register int i, j;
	DECLARE_ALIGNED(16, int, val)[dstW];

	for (i=0; i<dstW; i++)
	val[i] = dither[(i + offset) & 7] << 12;

	for (j = 0; j < filterSize; j++) {
	vector signed short l1, vLumFilter = vec_ld(j << 1, filter);
	vector unsigned char perm, perm0 = vec_lvsl(j << 1, filter);
	vLumFilter = vec_perm(vLumFilter, vLumFilter, perm0);
	vLumFilter = vec_splat(vLumFilter, 0); // lumFilter[j] is loaded 8 times in vLumFilter

	perm = vec_lvsl(0, src[j]);
	l1 = vec_ld(0, src[j]);

	for (i = 0; i < (dstW - 7); i+=8) {
	int offset = i << 2;
	vector signed short l2 = vec_ld((i << 1) + 16, src[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] += src[j][i] * filter[j];
	}
	}
	altivec_packIntArrayToCharArray(val, dest, dstW);
	}

	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;
	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[filterSizei + 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;

	if (c->srcBpc == 8 && c->dstBpc <= 10) {
	c->hyScale = c->hcScale = hScale_altivec_real;
	}
	if (!is16BPS(dstFormat) && !is9_OR_10BPS(dstFormat) &&
	dstFormat != PIX_FMT_NV12 && dstFormat != PIX_FMT_NV21 &&
	!c->alpPixBuf) {
	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->alpPixBuf) {
	switch (c->dstFormat) {
	case PIX_FMT_ABGR: c->yuv2packedX = ff_yuv2abgr_X_altivec; break;
	case PIX_FMT_BGRA: c->yuv2packedX = ff_yuv2bgra_X_altivec; break;
	case PIX_FMT_ARGB: c->yuv2packedX = ff_yuv2argb_X_altivec; break;
	case PIX_FMT_RGBA: c->yuv2packedX = ff_yuv2rgba_X_altivec; break;
	case PIX_FMT_BGR24: c->yuv2packedX = ff_yuv2bgr24_X_altivec; break;
	case PIX_FMT_RGB24: c->yuv2packedX = ff_yuv2rgb24_X_altivec; break;
	}
	}
	}