/*

  * Copyright (C) 2001-2011 Michael Niedermayer <michaelni@gmx.at>

  *
  * 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 <math.h>

 #include <stdio.h>

 #include <string.h>
 

 #include "libavutil/avassert.h"

 #include "libavutil/avutil.h"

 #include "libavutil/bswap.h"

 #include "libavutil/cpu.h"

 #include "libavutil/imgutils.h"

 #include "libavutil/intreadwrite.h"
 #include "libavutil/mathematics.h"

 #include "libavutil/pixdesc.h"

 #include "config.h"
 #include "rgb2rgb.h"
 #include "swscale_internal.h"
 #include "swscale.h"

 DECLARE_ALIGNED(8, const uint8_t, ff_dither_8x8_128)[9][8] = {

     {  36, 68,  60, 92,  34, 66,  58, 90, },
     { 100,  4, 124, 28,  98,  2, 122, 26, },
     {  52, 84,  44, 76,  50, 82,  42, 74, },
     { 116, 20, 108, 12, 114, 18, 106, 10, },
     {  32, 64,  56, 88,  38, 70,  62, 94, },
     {  96,  0, 120, 24, 102,  6, 126, 30, },
     {  48, 80,  40, 72,  54, 86,  46, 78, },
     { 112, 16, 104,  8, 118, 22, 110, 14, },

     {  36, 68,  60, 92,  34, 66,  58, 90, },

 };

 DECLARE_ALIGNED(8, static const uint8_t, sws_pb_64)[8] = {

     64, 64, 64, 64, 64, 64, 64, 64

 };

 static av_always_inline void fillPlane(uint8_t *plane, int stride, int width,
                                        int height, int y, uint8_t val)

 {

     int i;

     uint8_t *ptr = plane + stride * y;
     for (i = 0; i < height; i++) {

         memset(ptr, val, width);
         ptr += stride;
     }
 }
 

 static void hScale16To19_c(SwsContext *c, int16_t *_dst, int dstW,
                            const uint8_t *_src, const int16_t *filter,

                            const int32_t *filterPos, int filterSize)

 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);

     int i;

     int32_t *dst        = (int32_t *) _dst;

     const uint16_t *src = (const uint16_t *) _src;

     int bits            = desc->comp[0].depth_minus1;

     int sh              = bits - 4;

     if((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth_minus1<15)

         sh= 9;
 

     for (i = 0; i < dstW; i++) {
         int j;
         int srcPos = filterPos[i];

         int val    = 0;

 
         for (j = 0; j < filterSize; j++) {
             val += src[srcPos + j] * filter[filterSize * i + j];
         }
         // filter=14 bit, input=16 bit, output=30 bit, >> 11 makes 19 bit

         dst[i] = FFMIN(val >> sh, (1 << 19) - 1);

     }
 }
 

 static void hScale16To15_c(SwsContext *c, int16_t *dst, int dstW,
                            const uint8_t *_src, const int16_t *filter,

                            const int32_t *filterPos, int filterSize)

 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);

     int i;
     const uint16_t *src = (const uint16_t *) _src;

     int sh              = desc->comp[0].depth_minus1;

     if(sh<15)

         sh= isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8 ? 13 : desc->comp[0].depth_minus1;

     for (i = 0; i < dstW; i++) {
         int j;
         int srcPos = filterPos[i];

         int val    = 0;

 
         for (j = 0; j < filterSize; j++) {
             val += src[srcPos + j] * filter[filterSize * i + j];
         }
         // filter=14 bit, input=16 bit, output=30 bit, >> 15 makes 15 bit
         dst[i] = FFMIN(val >> sh, (1 << 15) - 1);
     }
 }
 

 // bilinear / bicubic scaling

 static void hScale8To15_c(SwsContext *c, int16_t *dst, int dstW,
                           const uint8_t *src, const int16_t *filter,
                           const int32_t *filterPos, int filterSize)

 {

     int i;

     for (i = 0; i < dstW; i++) {

         int j;

         int srcPos = filterPos[i];
         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); // the cubic equation does overflow ...

     }

 }

 static void hScale8To19_c(SwsContext *c, int16_t *_dst, int dstW,
                           const uint8_t *src, const int16_t *filter,
                           const int32_t *filterPos, int filterSize)

 {
     int i;
     int32_t *dst = (int32_t *) _dst;

     for (i = 0; i < dstW; i++) {

         int j;

         int srcPos = filterPos[i];
         int val    = 0;
         for (j = 0; j < filterSize; j++) {
             val += ((int)src[srcPos + j]) * filter[filterSize * i + j];

         }

         dst[i] = FFMIN(val >> 3, (1 << 19) - 1); // the cubic equation does overflow ...

     }
 }
 

 // FIXME all pal and rgb srcFormats could do this conversion as well

 // FIXME all scalers more complex than bilinear could do half of this transform

 static void chrRangeToJpeg_c(int16_t *dstU, int16_t *dstV, int width)

 {
     int i;
     for (i = 0; i < width; i++) {

         dstU[i] = (FFMIN(dstU[i], 30775) * 4663 - 9289992) >> 12; // -264
         dstV[i] = (FFMIN(dstV[i], 30775) * 4663 - 9289992) >> 12; // -264

     }

 }

 static void chrRangeFromJpeg_c(int16_t *dstU, int16_t *dstV, int width)

 {

     int i;
     for (i = 0; i < width; i++) {

         dstU[i] = (dstU[i] * 1799 + 4081085) >> 11; // 1469
         dstV[i] = (dstV[i] * 1799 + 4081085) >> 11; // 1469

     }

 }

 static void lumRangeToJpeg_c(int16_t *dst, int width)

 {

     int i;
     for (i = 0; i < width; i++)

         dst[i] = (FFMIN(dst[i], 30189) * 19077 - 39057361) >> 14;

 }

 static void lumRangeFromJpeg_c(int16_t *dst, int width)

 {
     int i;
     for (i = 0; i < width; i++)

         dst[i] = (dst[i] * 14071 + 33561947) >> 14;

 }
 

 static void chrRangeToJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)
 {
     int i;
     int32_t *dstU = (int32_t *) _dstU;
     int32_t *dstV = (int32_t *) _dstV;
     for (i = 0; i < width; i++) {

         dstU[i] = (FFMIN(dstU[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264
         dstV[i] = (FFMIN(dstV[i], 30775 << 4) * 4663 - (9289992 << 4)) >> 12; // -264

     }
 }

 static void chrRangeFromJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)
 {
     int i;
     int32_t *dstU = (int32_t *) _dstU;
     int32_t *dstV = (int32_t *) _dstV;
     for (i = 0; i < width; i++) {

         dstU[i] = (dstU[i] * 1799 + (4081085 << 4)) >> 11; // 1469
         dstV[i] = (dstV[i] * 1799 + (4081085 << 4)) >> 11; // 1469

     }
 }

 static void lumRangeToJpeg16_c(int16_t *_dst, int width)
 {
     int i;
     int32_t *dst = (int32_t *) _dst;

     for (i = 0; i < width; i++) {
         dst[i] = ((int)(FFMIN(dst[i], 30189 << 4) * 4769U - (39057361 << 2))) >> 12;
     }

 }

 static void lumRangeFromJpeg16_c(int16_t *_dst, int width)
 {
     int i;
     int32_t *dst = (int32_t *) _dst;
     for (i = 0; i < width; i++)

         dst[i] = (dst[i]*(14071/4) + (33561947<<4)/4)>>12;

 }
 

 // *** horizontal scale Y line to temp buffer

 static av_always_inline void hyscale(SwsContext *c, int16_t *dst, int dstWidth,

                                      const uint8_t *src_in[4],
                                      int srcW, int xInc,

                                      const int16_t *hLumFilter,

                                      const int32_t *hLumFilterPos,
                                      int hLumFilterSize,

                                      uint8_t *formatConvBuffer,
                                      uint32_t *pal, int isAlpha)

 {

     void (*toYV12)(uint8_t *, const uint8_t *, const uint8_t *, const uint8_t *, int, uint32_t *) =

         isAlpha ? c->alpToYV12 : c->lumToYV12;

     void (*convertRange)(int16_t *, int) = isAlpha ? NULL : c->lumConvertRange;

     const uint8_t *src = src_in[isAlpha ? 3 : 0];

     if (toYV12) {

         toYV12(formatConvBuffer, src, src_in[1], src_in[2], srcW, pal);

         src = formatConvBuffer;

     } else if (c->readLumPlanar && !isAlpha) {

         c->readLumPlanar(formatConvBuffer, src_in, srcW, c->input_rgb2yuv_table);

         src = formatConvBuffer;

     } else if (c->readAlpPlanar && isAlpha) {
         c->readAlpPlanar(formatConvBuffer, src_in, srcW, NULL);
         src = formatConvBuffer;

     }

     if (!c->hyscale_fast) {

         c->hyScale(c, dst, dstWidth, src, hLumFilter,
                    hLumFilterPos, hLumFilterSize);

     } else { // fast bilinear upscale / crap downscale
         c->hyscale_fast(c, dst, dstWidth, src, srcW, xInc);

     }

 
     if (convertRange)
         convertRange(dst, dstWidth);

 }

 static av_always_inline void hcscale(SwsContext *c, int16_t *dst1,
                                      int16_t *dst2, int dstWidth,

                                      const uint8_t *src_in[4],

                                      int srcW, int xInc,
                                      const int16_t *hChrFilter,
                                      const int32_t *hChrFilterPos,
                                      int hChrFilterSize,

                                      uint8_t *formatConvBuffer, uint32_t *pal)

 {

     const uint8_t *src1 = src_in[1], *src2 = src_in[2];

     if (c->chrToYV12) {

         uint8_t *buf2 = formatConvBuffer +

                         FFALIGN(srcW*2+78, 16);

         c->chrToYV12(formatConvBuffer, buf2, src_in[0], src1, src2, srcW, pal);

         src1= formatConvBuffer;
         src2= buf2;

     } else if (c->readChrPlanar) {

         uint8_t *buf2 = formatConvBuffer +

                         FFALIGN(srcW*2+78, 16);

         c->readChrPlanar(formatConvBuffer, buf2, src_in, srcW, c->input_rgb2yuv_table);

         src1 = formatConvBuffer;
         src2 = buf2;

     }

     if (!c->hcscale_fast) {

         c->hcScale(c, dst1, dstWidth, src1, hChrFilter, hChrFilterPos, hChrFilterSize);
         c->hcScale(c, dst2, dstWidth, src2, hChrFilter, hChrFilterPos, hChrFilterSize);

     } else { // fast bilinear upscale / crap downscale
         c->hcscale_fast(c, dst1, dst2, dstWidth, src1, src2, srcW, xInc);

     }

 
     if (c->chrConvertRange)
         c->chrConvertRange(dst1, dst2, dstWidth);

 }
 

 #define DEBUG_SWSCALE_BUFFERS 0

 #define DEBUG_BUFFERS(...)                      \
     if (DEBUG_SWSCALE_BUFFERS)                  \
         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

 static int swscale(SwsContext *c, const uint8_t *src[],

                    int srcStride[], int srcSliceY,

                    int srcSliceH, uint8_t *dst[], int dstStride[])

 {

     /* load a few things into local vars to make the code more readable?
      * and faster */
     const int srcW                   = c->srcW;
     const int dstW                   = c->dstW;
     const int dstH                   = c->dstH;
     const int chrDstW                = c->chrDstW;
     const int chrSrcW                = c->chrSrcW;
     const int lumXInc                = c->lumXInc;
     const int chrXInc                = c->chrXInc;

     const enum AVPixelFormat dstFormat = c->dstFormat;

     const int flags                  = c->flags;
     int32_t *vLumFilterPos           = c->vLumFilterPos;
     int32_t *vChrFilterPos           = c->vChrFilterPos;
     int32_t *hLumFilterPos           = c->hLumFilterPos;
     int32_t *hChrFilterPos           = c->hChrFilterPos;
     int16_t *hLumFilter              = c->hLumFilter;
     int16_t *hChrFilter              = c->hChrFilter;
     int32_t *lumMmxFilter            = c->lumMmxFilter;
     int32_t *chrMmxFilter            = c->chrMmxFilter;
     const int vLumFilterSize         = c->vLumFilterSize;
     const int vChrFilterSize         = c->vChrFilterSize;
     const int hLumFilterSize         = c->hLumFilterSize;
     const int hChrFilterSize         = c->hChrFilterSize;
     int16_t **lumPixBuf              = c->lumPixBuf;
     int16_t **chrUPixBuf             = c->chrUPixBuf;
     int16_t **chrVPixBuf             = c->chrVPixBuf;
     int16_t **alpPixBuf              = c->alpPixBuf;
     const int vLumBufSize            = c->vLumBufSize;
     const int vChrBufSize            = c->vChrBufSize;
     uint8_t *formatConvBuffer        = c->formatConvBuffer;
     uint32_t *pal                    = c->pal_yuv;
     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;
     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;
     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;
     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;
     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;
     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

     const int chrSrcSliceY           =                srcSliceY >> c->chrSrcVSubSample;
     const int chrSrcSliceH           = FF_CEIL_RSHIFT(srcSliceH,   c->chrSrcVSubSample);

     int should_dither                = is9_OR_10BPS(c->srcFormat) ||
                                        is16BPS(c->srcFormat);

     int lastDstY;
 
     /* vars which will change and which we need to store back in the context */

     int dstY         = c->dstY;
     int lumBufIndex  = c->lumBufIndex;
     int chrBufIndex  = c->chrBufIndex;
     int lastInLumBuf = c->lastInLumBuf;
     int lastInChrBuf = c->lastInChrBuf;

     if (!usePal(c->srcFormat)) {
         pal = c->input_rgb2yuv_table;
     }
 

     if (isPacked(c->srcFormat)) {

         src[0] =
         src[1] =
         src[2] =
         src[3] = src[0];
         srcStride[0] =
         srcStride[1] =
         srcStride[2] =
         srcStride[3] = srcStride[0];

     }

     srcStride[1] <<= c->vChrDrop;
     srcStride[2] <<= c->vChrDrop;

     DEBUG_BUFFERS("swscale() %p[%d] %p[%d] %p[%d] %p[%d] -> %p[%d] %p[%d] %p[%d] %p[%d]\n",

                   src[0], srcStride[0], src[1], srcStride[1],
                   src[2], srcStride[2], src[3], srcStride[3],
                   dst[0], dstStride[0], dst[1], dstStride[1],
                   dst[2], dstStride[2], dst[3], dstStride[3]);

     DEBUG_BUFFERS("srcSliceY: %d srcSliceH: %d dstY: %d dstH: %d\n",

                   srcSliceY, srcSliceH, dstY, dstH);

     DEBUG_BUFFERS("vLumFilterSize: %d vLumBufSize: %d vChrFilterSize: %d vChrBufSize: %d\n",

                   vLumFilterSize, vLumBufSize, vChrFilterSize, vChrBufSize);

     if (dstStride[0]&15 || dstStride[1]&15 ||
         dstStride[2]&15 || dstStride[3]&15) {

         static int warnedAlready = 0; // FIXME maybe move this into the context

         if (flags & SWS_PRINT_INFO && !warnedAlready) {

             av_log(c, AV_LOG_WARNING,
                    "Warning: dstStride is not aligned!\n"

                    "         ->cannot do aligned memory accesses anymore\n");

             warnedAlready = 1;

         }
     }

     if (   (uintptr_t)dst[0]&15 || (uintptr_t)dst[1]&15 || (uintptr_t)dst[2]&15
         || (uintptr_t)src[0]&15 || (uintptr_t)src[1]&15 || (uintptr_t)src[2]&15
         || dstStride[0]&15 || dstStride[1]&15 || dstStride[2]&15 || dstStride[3]&15
         || srcStride[0]&15 || srcStride[1]&15 || srcStride[2]&15 || srcStride[3]&15

     ) {
         static int warnedAlready=0;
         int cpu_flags = av_get_cpu_flags();

         if (HAVE_MMXEXT && (cpu_flags & AV_CPU_FLAG_SSE2) && !warnedAlready){

             av_log(c, AV_LOG_WARNING, "Warning: data is not aligned! This can lead to a speedloss\n");
             warnedAlready=1;
         }
     }
 

     /* Note the user might start scaling the picture in the middle so this

      * will not get executed. This is not really intended but works
      * currently, so people might do it. */
     if (srcSliceY == 0) {
         lumBufIndex  = -1;
         chrBufIndex  = -1;
         dstY         = 0;
         lastInLumBuf = -1;
         lastInChrBuf = -1;

     }
 

     if (!should_dither) {

         c->chrDither8 = c->lumDither8 = sws_pb_64;

     }

     lastDstY = dstY;

     for (; dstY < dstH; dstY++) {
         const int chrDstY = dstY >> c->chrDstVSubSample;
         uint8_t *dest[4]  = {

             dst[0] + dstStride[0] * dstY,
             dst[1] + dstStride[1] * chrDstY,
             dst[2] + dstStride[2] * chrDstY,
             (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL,
         };

         int use_mmx_vfilter= c->use_mmx_vfilter;

         // First line needed as input
         const int firstLumSrcY  = FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]);
         const int firstLumSrcY2 = FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1 << c->chrDstVSubSample) - 1), dstH - 1)]);
         // First line needed as input
         const int firstChrSrcY  = FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]);

 
         // Last line needed as input
         int lastLumSrcY  = FFMIN(c->srcH,    firstLumSrcY  + vLumFilterSize) - 1;
         int lastLumSrcY2 = FFMIN(c->srcH,    firstLumSrcY2 + vLumFilterSize) - 1;
         int lastChrSrcY  = FFMIN(c->chrSrcH, firstChrSrcY  + vChrFilterSize) - 1;

         int enough_lines;
 

         // handle holes (FAST_BILINEAR & weird filters)
         if (firstLumSrcY > lastInLumBuf)
             lastInLumBuf = firstLumSrcY - 1;
         if (firstChrSrcY > lastInChrBuf)
             lastInChrBuf = firstChrSrcY - 1;

         av_assert0(firstLumSrcY >= lastInLumBuf - vLumBufSize + 1);
         av_assert0(firstChrSrcY >= lastInChrBuf - vChrBufSize + 1);

 
         DEBUG_BUFFERS("dstY: %d\n", dstY);
         DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",

                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

         DEBUG_BUFFERS("\tfirstChrSrcY: %d lastChrSrcY: %d lastInChrBuf: %d\n",

                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

 
         // Do we have enough lines in this slice to output the dstY line

         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

                        lastChrSrcY < FF_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample);

 
         if (!enough_lines) {
             lastLumSrcY = srcSliceY + srcSliceH - 1;
             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;
             DEBUG_BUFFERS("buffering slice: lastLumSrcY %d lastChrSrcY %d\n",

                           lastLumSrcY, lastChrSrcY);

         }

         // Do horizontal scaling
         while (lastInLumBuf < lastLumSrcY) {

             const uint8_t *src1[4] = {
                 src[0] + (lastInLumBuf + 1 - srcSliceY) * srcStride[0],
                 src[1] + (lastInLumBuf + 1 - srcSliceY) * srcStride[1],
                 src[2] + (lastInLumBuf + 1 - srcSliceY) * srcStride[2],
                 src[3] + (lastInLumBuf + 1 - srcSliceY) * srcStride[3],
             };

             lumBufIndex++;

             av_assert0(lumBufIndex < 2 * vLumBufSize);
             av_assert0(lastInLumBuf + 1 - srcSliceY < srcSliceH);
             av_assert0(lastInLumBuf + 1 - srcSliceY >= 0);

             hyscale(c, lumPixBuf[lumBufIndex], dstW, src1, srcW, lumXInc,

                     hLumFilter, hLumFilterPos, hLumFilterSize,

                     formatConvBuffer, pal, 0);

             if (CONFIG_SWSCALE_ALPHA && alpPixBuf)

                 hyscale(c, alpPixBuf[lumBufIndex], dstW, src1, srcW,

                         lumXInc, hLumFilter, hLumFilterPos, hLumFilterSize,

                         formatConvBuffer, pal, 1);

             lastInLumBuf++;
             DEBUG_BUFFERS("\t\tlumBufIndex %d: lastInLumBuf: %d\n",

                           lumBufIndex, lastInLumBuf);

         }

         while (lastInChrBuf < lastChrSrcY) {

             const uint8_t *src1[4] = {
                 src[0] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[0],
                 src[1] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[1],
                 src[2] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[2],
                 src[3] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[3],
             };

             chrBufIndex++;

             av_assert0(chrBufIndex < 2 * vChrBufSize);
             av_assert0(lastInChrBuf + 1 - chrSrcSliceY < (chrSrcSliceH));
             av_assert0(lastInChrBuf + 1 - chrSrcSliceY >= 0);

             // FIXME replace parameters through context struct (some at least)

 
             if (c->needs_hcscale)

                 hcscale(c, chrUPixBuf[chrBufIndex], chrVPixBuf[chrBufIndex],

                         chrDstW, src1, chrSrcW, chrXInc,
                         hChrFilter, hChrFilterPos, hChrFilterSize,
                         formatConvBuffer, pal);

             lastInChrBuf++;
             DEBUG_BUFFERS("\t\tchrBufIndex %d: lastInChrBuf: %d\n",

                           chrBufIndex, lastInChrBuf);

         }

         // wrap buf index around to stay inside the ring buffer
         if (lumBufIndex >= vLumBufSize)
             lumBufIndex -= vLumBufSize;
         if (chrBufIndex >= vChrBufSize)
             chrBufIndex -= vChrBufSize;

         if (!enough_lines)

             break;  // we can't output a dstY line so let's try with the next slice

 #if HAVE_MMX_INLINE

         updateMMXDitherTables(c, dstY, lumBufIndex, chrBufIndex,
                               lastInLumBuf, lastInChrBuf);

 #endif

         if (should_dither) {

             c->chrDither8 = ff_dither_8x8_128[chrDstY & 7];
             c->lumDither8 = ff_dither_8x8_128[dstY    & 7];

         }

         if (dstY >= dstH - 2) {
             /* hmm looks like we can't use MMX here without overwriting
              * this array's tail */
             ff_sws_init_output_funcs(c, &yuv2plane1, &yuv2planeX, &yuv2nv12cX,

                                      &yuv2packed1, &yuv2packed2, &yuv2packedX, &yuv2anyX);

             use_mmx_vfilter= 0;

         }
 
         {

             const int16_t **lumSrcPtr  = (const int16_t **)(void*) lumPixBuf  + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize;
             const int16_t **chrUSrcPtr = (const int16_t **)(void*) chrUPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;
             const int16_t **chrVSrcPtr = (const int16_t **)(void*) chrVPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;

             const int16_t **alpSrcPtr  = (CONFIG_SWSCALE_ALPHA && alpPixBuf) ?

                                          (const int16_t **)(void*) alpPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize : NULL;
             int16_t *vLumFilter = c->vLumFilter;
             int16_t *vChrFilter = c->vChrFilter;

             if (isPlanarYUV(dstFormat) ||
                 (isGray(dstFormat) && !isALPHA(dstFormat))) { // YV12 like
                 const int chrSkipMask = (1 << c->chrDstVSubSample) - 1;

                 vLumFilter +=    dstY * vLumFilterSize;
                 vChrFilter += chrDstY * vChrFilterSize;
 

 //                 av_assert0(use_mmx_vfilter != (
 //                                yuv2planeX == yuv2planeX_10BE_c
 //                             || yuv2planeX == yuv2planeX_10LE_c
 //                             || yuv2planeX == yuv2planeX_9BE_c
 //                             || yuv2planeX == yuv2planeX_9LE_c
 //                             || yuv2planeX == yuv2planeX_16BE_c
 //                             || yuv2planeX == yuv2planeX_16LE_c
 //                             || yuv2planeX == yuv2planeX_8_c) || !ARCH_X86);

                 if(use_mmx_vfilter){

                     vLumFilter= (int16_t *)c->lumMmxFilter;
                     vChrFilter= (int16_t *)c->chrMmxFilter;

                 }
 

                 if (vLumFilterSize == 1) {
                     yuv2plane1(lumSrcPtr[0], dest[0], dstW, c->lumDither8, 0);
                 } else {

                     yuv2planeX(vLumFilter, vLumFilterSize,

                                lumSrcPtr, dest[0],

                                dstW, c->lumDither8, 0);

                 }

                 if (!((dstY & chrSkipMask) || isGray(dstFormat))) {

                     if (yuv2nv12cX) {

                         yuv2nv12cX(c, vChrFilter,

                                    vChrFilterSize, chrUSrcPtr, chrVSrcPtr,
                                    dest[1], chrDstW);

                     } else if (vChrFilterSize == 1) {
                         yuv2plane1(chrUSrcPtr[0], dest[1], chrDstW, c->chrDither8, 0);
                         yuv2plane1(chrVSrcPtr[0], dest[2], chrDstW, c->chrDither8, 3);
                     } else {

                         yuv2planeX(vChrFilter,

                                    vChrFilterSize, chrUSrcPtr, dest[1],
                                    chrDstW, c->chrDither8, 0);

                         yuv2planeX(vChrFilter,

                                    vChrFilterSize, chrVSrcPtr, dest[2],

                                    chrDstW, c->chrDither8, use_mmx_vfilter ? (c->uv_offx2 >> 1) : 3);

                     }

                 }

                 if (CONFIG_SWSCALE_ALPHA && alpPixBuf) {

                     if(use_mmx_vfilter){

                         vLumFilter= (int16_t *)c->alpMmxFilter;

                     }

                     if (vLumFilterSize == 1) {

                         yuv2plane1(alpSrcPtr[0], dest[3], dstW,
                                    c->lumDither8, 0);

                     } else {

                         yuv2planeX(vLumFilter,

                                    vLumFilterSize, alpSrcPtr, dest[3],
                                    dstW, c->lumDither8, 0);

                     }

                 }

             } else if (yuv2packedX) {

                 av_assert1(lumSrcPtr  + vLumFilterSize - 1 < (const int16_t **)lumPixBuf  + vLumBufSize * 2);
                 av_assert1(chrUSrcPtr + vChrFilterSize - 1 < (const int16_t **)chrUPixBuf + vChrBufSize * 2);

                 if (c->yuv2packed1 && vLumFilterSize == 1 &&
                     vChrFilterSize <= 2) { // unscaled RGB

                     int chrAlpha = vChrFilterSize == 1 ? 0 : vChrFilter[2 * dstY + 1];

                     yuv2packed1(c, *lumSrcPtr, chrUSrcPtr, chrVSrcPtr,
                                 alpPixBuf ? *alpSrcPtr : NULL,
                                 dest[0], dstW, chrAlpha, dstY);

                 } else if (c->yuv2packed2 && vLumFilterSize == 2 &&
                            vChrFilterSize == 2) { // bilinear upscale RGB

                     int lumAlpha = vLumFilter[2 * dstY + 1];
                     int chrAlpha = vChrFilter[2 * dstY + 1];
                     lumMmxFilter[2] =

                     lumMmxFilter[3] = vLumFilter[2 * dstY]    * 0x10001;

                     chrMmxFilter[2] =
                     chrMmxFilter[3] = vChrFilter[2 * chrDstY] * 0x10001;
                     yuv2packed2(c, lumSrcPtr, chrUSrcPtr, chrVSrcPtr,
                                 alpPixBuf ? alpSrcPtr : NULL,
                                 dest[0], dstW, lumAlpha, chrAlpha, dstY);

                 } else { // general RGB

                     yuv2packedX(c, vLumFilter + dstY * vLumFilterSize,
                                 lumSrcPtr, vLumFilterSize,
                                 vChrFilter + dstY * vChrFilterSize,
                                 chrUSrcPtr, chrVSrcPtr, vChrFilterSize,
                                 alpSrcPtr, dest[0], dstW, dstY);

                 }

             } else {
                 av_assert1(!yuv2packed1 && !yuv2packed2);
                 yuv2anyX(c, vLumFilter + dstY * vLumFilterSize,
                          lumSrcPtr, vLumFilterSize,
                          vChrFilter + dstY * vChrFilterSize,
                          chrUSrcPtr, chrVSrcPtr, vChrFilterSize,
                          alpSrcPtr, dest, dstW, dstY);

             }
         }

     }

     if (isPlanar(dstFormat) && isALPHA(dstFormat) && !alpPixBuf) {
         int length = dstW;
         int height = dstY - lastDstY;
 

         if (is16BPS(dstFormat) || isNBPS(dstFormat)) {

             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);

             fillPlane16(dst[3], dstStride[3], length, height, lastDstY,
                     1, desc->comp[3].depth_minus1,
                     isBE(dstFormat));

         } else
             fillPlane(dst[3], dstStride[3], length, height, lastDstY, 255);
     }

 #if HAVE_MMXEXT_INLINE

     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

         __asm__ volatile ("sfence" ::: "memory");

 #endif
     emms_c();
 
     /* store changed local vars back in the context */

     c->dstY         = dstY;
     c->lumBufIndex  = lumBufIndex;
     c->chrBufIndex  = chrBufIndex;
     c->lastInLumBuf = lastInLumBuf;
     c->lastInChrBuf = lastInChrBuf;

 
     return dstY - lastDstY;

 }
 

 av_cold void ff_sws_init_range_convert(SwsContext *c)
 {
     c->lumConvertRange = NULL;
     c->chrConvertRange = NULL;
     if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
         if (c->dstBpc <= 14) {
             if (c->srcRange) {
                 c->lumConvertRange = lumRangeFromJpeg_c;
                 c->chrConvertRange = chrRangeFromJpeg_c;
             } else {
                 c->lumConvertRange = lumRangeToJpeg_c;
                 c->chrConvertRange = chrRangeToJpeg_c;
             }
         } else {
             if (c->srcRange) {
                 c->lumConvertRange = lumRangeFromJpeg16_c;
                 c->chrConvertRange = chrRangeFromJpeg16_c;
             } else {
                 c->lumConvertRange = lumRangeToJpeg16_c;
                 c->chrConvertRange = chrRangeToJpeg16_c;
             }
         }
     }
 }
 

 static av_cold void sws_init_swscale(SwsContext *c)

 {

     enum AVPixelFormat srcFormat = c->srcFormat;

     ff_sws_init_output_funcs(c, &c->yuv2plane1, &c->yuv2planeX,
                              &c->yuv2nv12cX, &c->yuv2packed1,

                              &c->yuv2packed2, &c->yuv2packedX, &c->yuv2anyX);

     ff_sws_init_input_funcs(c);

     if (c->srcBpc == 8) {

         if (c->dstBpc <= 14) {

             c->hyScale = c->hcScale = hScale8To15_c;

             if (c->flags & SWS_FAST_BILINEAR) {

                 c->hyscale_fast = ff_hyscale_fast_c;
                 c->hcscale_fast = ff_hcscale_fast_c;

             }

         } else {

             c->hyScale = c->hcScale = hScale8To19_c;

         }

     } else {

         c->hyScale = c->hcScale = c->dstBpc > 14 ? hScale16To19_c

                                                  : hScale16To15_c;

     }

     ff_sws_init_range_convert(c);

     if (!(isGray(srcFormat) || isGray(c->dstFormat) ||

           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

         c->needs_hcscale = 1;

 }

 SwsFunc ff_getSwsFunc(SwsContext *c)

 {

     sws_init_swscale(c);

     if (ARCH_PPC)
         ff_sws_init_swscale_ppc(c);

     if (ARCH_X86)
         ff_sws_init_swscale_x86(c);

     return swscale;

 }

 
 static void reset_ptr(const uint8_t *src[], int format)
 {
     if (!isALPHA(format))
         src[3] = NULL;
     if (!isPlanar(format)) {
         src[3] = src[2] = NULL;
 
         if (!usePal(format))
             src[1] = NULL;
     }
 }
 

 static int check_image_pointers(const uint8_t * const data[4], enum AVPixelFormat pix_fmt,

                                 const int linesizes[4])
 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

     int i;
 
     for (i = 0; i < 4; i++) {
         int plane = desc->comp[i].plane;
         if (!data[plane] || !linesizes[plane])
             return 0;
     }
 
     return 1;
 }
 

 static void xyz12Torgb48(struct SwsContext *c, uint16_t *dst,
                          const uint16_t *src, int stride, int h)
 {
     int xp,yp;
     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->srcFormat);
 
     for (yp=0; yp<h; yp++) {
         for (xp=0; xp+2<stride; xp+=3) {
             int x, y, z, r, g, b;
 

             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

                 x = AV_RB16(src + xp + 0);
                 y = AV_RB16(src + xp + 1);
                 z = AV_RB16(src + xp + 2);
             } else {
                 x = AV_RL16(src + xp + 0);
                 y = AV_RL16(src + xp + 1);
                 z = AV_RL16(src + xp + 2);
             }
 
             x = c->xyzgamma[x>>4];
             y = c->xyzgamma[y>>4];
             z = c->xyzgamma[z>>4];
 
             // convert from XYZlinear to sRGBlinear
             r = c->xyz2rgb_matrix[0][0] * x +
                 c->xyz2rgb_matrix[0][1] * y +
                 c->xyz2rgb_matrix[0][2] * z >> 12;
             g = c->xyz2rgb_matrix[1][0] * x +
                 c->xyz2rgb_matrix[1][1] * y +
                 c->xyz2rgb_matrix[1][2] * z >> 12;
             b = c->xyz2rgb_matrix[2][0] * x +

                 c->xyz2rgb_matrix[2][1] * y +

                 c->xyz2rgb_matrix[2][2] * z >> 12;
 
             // limit values to 12-bit depth
             r = av_clip_c(r,0,4095);
             g = av_clip_c(g,0,4095);
             b = av_clip_c(b,0,4095);
 
             // convert from sRGBlinear to RGB and scale from 12bit to 16bit

             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

                 AV_WB16(dst + xp + 0, c->rgbgamma[r] << 4);
                 AV_WB16(dst + xp + 1, c->rgbgamma[g] << 4);
                 AV_WB16(dst + xp + 2, c->rgbgamma[b] << 4);
             } else {
                 AV_WL16(dst + xp + 0, c->rgbgamma[r] << 4);
                 AV_WL16(dst + xp + 1, c->rgbgamma[g] << 4);
                 AV_WL16(dst + xp + 2, c->rgbgamma[b] << 4);
             }
         }
         src += stride;
         dst += stride;
     }
 }
 

 static void rgb48Toxyz12(struct SwsContext *c, uint16_t *dst,
                          const uint16_t *src, int stride, int h)
 {
     int xp,yp;

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(c->dstFormat);

 
     for (yp=0; yp<h; yp++) {
         for (xp=0; xp+2<stride; xp+=3) {
             int x, y, z, r, g, b;
 
             if (desc->flags & AV_PIX_FMT_FLAG_BE) {
                 r = AV_RB16(src + xp + 0);
                 g = AV_RB16(src + xp + 1);
                 b = AV_RB16(src + xp + 2);
             } else {
                 r = AV_RL16(src + xp + 0);
                 g = AV_RL16(src + xp + 1);
                 b = AV_RL16(src + xp + 2);
             }
 
             r = c->rgbgammainv[r>>4];
             g = c->rgbgammainv[g>>4];
             b = c->rgbgammainv[b>>4];
 
             // convert from sRGBlinear to XYZlinear
             x = c->rgb2xyz_matrix[0][0] * r +
                 c->rgb2xyz_matrix[0][1] * g +
                 c->rgb2xyz_matrix[0][2] * b >> 12;
             y = c->rgb2xyz_matrix[1][0] * r +
                 c->rgb2xyz_matrix[1][1] * g +
                 c->rgb2xyz_matrix[1][2] * b >> 12;
             z = c->rgb2xyz_matrix[2][0] * r +
                 c->rgb2xyz_matrix[2][1] * g +
                 c->rgb2xyz_matrix[2][2] * b >> 12;
 
             // limit values to 12-bit depth
             x = av_clip_c(x,0,4095);
             y = av_clip_c(y,0,4095);
             z = av_clip_c(z,0,4095);
 
             // convert from XYZlinear to X'Y'Z' and scale from 12bit to 16bit
             if (desc->flags & AV_PIX_FMT_FLAG_BE) {
                 AV_WB16(dst + xp + 0, c->xyzgammainv[x] << 4);
                 AV_WB16(dst + xp + 1, c->xyzgammainv[y] << 4);
                 AV_WB16(dst + xp + 2, c->xyzgammainv[z] << 4);
             } else {
                 AV_WL16(dst + xp + 0, c->xyzgammainv[x] << 4);
                 AV_WL16(dst + xp + 1, c->xyzgammainv[y] << 4);
                 AV_WL16(dst + xp + 2, c->xyzgammainv[z] << 4);
             }
         }
         src += stride;
         dst += stride;
     }
 }
 

 /**
  * swscale wrapper, so we don't need to export the SwsContext.
  * Assumes planar YUV to be in YUV order instead of YVU.
  */
 int attribute_align_arg sws_scale(struct SwsContext *c,
                                   const uint8_t * const srcSlice[],
                                   const int srcStride[], int srcSliceY,
                                   int srcSliceH, uint8_t *const dst[],
                                   const int dstStride[])
 {
     int i, ret;

     const uint8_t *src2[4];
     uint8_t *dst2[4];

     uint8_t *rgb0_tmp = NULL;
 

     if (!srcStride || !dstStride || !dst || !srcSlice) {

         av_log(c, AV_LOG_ERROR, "One of the input parameters to sws_scale() is NULL, please check the calling code\n");
         return 0;
     }

     if (c->cascaded_context[0] && srcSliceY == 0 && srcSliceH == c->cascaded_context[0]->srcH) {
         ret = sws_scale(c->cascaded_context[0],
                         srcSlice, srcStride, srcSliceY, srcSliceH,
                         c->cascaded_tmp, c->cascaded_tmpStride);
         if (ret < 0)
             return ret;
         ret = sws_scale(c->cascaded_context[1],
                         (const uint8_t * const * )c->cascaded_tmp, c->cascaded_tmpStride, 0, c->cascaded_context[0]->dstH,
                         dst, dstStride);
         return ret;
     }
 

     memcpy(src2, srcSlice, sizeof(src2));
     memcpy(dst2, dst, sizeof(dst2));
 

     // do not mess up sliceDir if we have a "trailing" 0-size slice
     if (srcSliceH == 0)
         return 0;
 
     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {
         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");
         return 0;
     }
     if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) {
         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");
         return 0;
     }
 
     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {
         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");
         return 0;
     }
     if (c->sliceDir == 0) {
         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;
     }
 
     if (usePal(c->srcFormat)) {
         for (i = 0; i < 256; i++) {

             int r, g, b, y, u, v, a = 0xff;

             if (c->srcFormat == AV_PIX_FMT_PAL8) {

                 uint32_t p = ((const uint32_t *)(srcSlice[1]))[i];

                 a = (p >> 24) & 0xFF;
                 r = (p >> 16) & 0xFF;
                 g = (p >>  8) & 0xFF;
                 b =  p        & 0xFF;

             } else if (c->srcFormat == AV_PIX_FMT_RGB8) {

                 r = ( i >> 5     ) * 36;
                 g = ((i >> 2) & 7) * 36;
                 b = ( i       & 3) * 85;

             } else if (c->srcFormat == AV_PIX_FMT_BGR8) {

                 b = ( i >> 6     ) * 85;
                 g = ((i >> 3) & 7) * 36;
                 r = ( i       & 7) * 36;

             } else if (c->srcFormat == AV_PIX_FMT_RGB4_BYTE) {

                 r = ( i >> 3     ) * 255;
                 g = ((i >> 1) & 3) * 85;
                 b = ( i       & 1) * 255;

             } else if (c->srcFormat == AV_PIX_FMT_GRAY8 || c->srcFormat == AV_PIX_FMT_GRAY8A) {

                 r = g = b = i;
             } else {

                 av_assert1(c->srcFormat == AV_PIX_FMT_BGR4_BYTE);

                 b = ( i >> 3     ) * 255;
                 g = ((i >> 1) & 3) * 85;
                 r = ( i       & 1) * 255;
             }
 #define RGB2YUV_SHIFT 15
 #define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 #define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))
 
             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);
             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

             c->pal_yuv[i]= y + (u<<8) + (v<<16) + ((unsigned)a<<24);

 
             switch (c->dstFormat) {

             case AV_PIX_FMT_BGR32:

 #if !HAVE_BIGENDIAN

             case AV_PIX_FMT_RGB24:

 #endif

                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + ((unsigned)a<<24);

                 break;

             case AV_PIX_FMT_BGR32_1:

 #if HAVE_BIGENDIAN

             case AV_PIX_FMT_BGR24:

 #endif

                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + ((unsigned)b<<24);

                 break;

             case AV_PIX_FMT_RGB32_1:

 #if HAVE_BIGENDIAN

             case AV_PIX_FMT_RGB24:

 #endif

                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + ((unsigned)r<<24);

                 break;

             case AV_PIX_FMT_RGB32:

 #if !HAVE_BIGENDIAN

             case AV_PIX_FMT_BGR24:

 #endif
             default:

                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + ((unsigned)a<<24);

             }
         }
     }
 
     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {
         uint8_t *base;
         int x,y;
         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

         if (!rgb0_tmp)
             return AVERROR(ENOMEM);
 

         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;
         for (y=0; y<srcSliceH; y++){
             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);
             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {
                 base[ srcStride[0]*y + x] = 0xFF;
             }
         }
         src2[0] = base;
     }
 

     if (c->srcXYZ && !(c->dstXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {
         uint8_t *base;
         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

         if (!rgb0_tmp)
             return AVERROR(ENOMEM);
 

         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;
 

         xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2, srcSliceH);

         src2[0] = base;
     }
 

     if (!srcSliceY && (c->flags & SWS_BITEXACT) && c->dither == SWS_DITHER_ED && c->dither_error[0])

         for (i = 0; i < 4; i++)
             memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));
 
 

     // copy strides, so they can safely be modified
     if (c->sliceDir == 1) {
         // slices go from top to bottom
         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],
                               srcStride[3] };
         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],
                               dstStride[3] };
 
         reset_ptr(src2, c->srcFormat);
         reset_ptr((void*)dst2, c->dstFormat);
 
         /* reset slice direction at end of frame */
         if (srcSliceY + srcSliceH == c->srcH)
             c->sliceDir = 0;
 

         ret = c->swscale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

                           dstStride2);
     } else {
         // slices go from bottom to top => we flip the image internally
         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],
                               -srcStride[3] };
         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],
                               -dstStride[3] };
 
         src2[0] += (srcSliceH - 1) * srcStride[0];
         if (!usePal(c->srcFormat))
             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];
         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];
         src2[3] += (srcSliceH - 1) * srcStride[3];
         dst2[0] += ( c->dstH                         - 1) * dstStride[0];
         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];
         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];
         dst2[3] += ( c->dstH                         - 1) * dstStride[3];
 
         reset_ptr(src2, c->srcFormat);
         reset_ptr((void*)dst2, c->dstFormat);
 
         /* reset slice direction at end of frame */
         if (!srcSliceY)
             c->sliceDir = 0;
 

         ret = c->swscale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

                           srcSliceH, dst2, dstStride2);
     }
 

 
     if (c->dstXYZ && !(c->srcXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {
         /* replace on the same data */
         rgb48Toxyz12(c, (uint16_t*)dst2[0], (const uint16_t*)dst2[0], dstStride[0]/2, ret);
     }
 

     av_free(rgb0_tmp);
     return ret;
 }