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FFmpeg/libswscale/swscale.c

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  1. /*

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

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include <inttypes.h>

  22. #include <math.h>

  23. #include <stdio.h>

  24. #include <string.h>

  25. 

  26. #include "libavutil/avassert.h"

  27. #include "libavutil/avutil.h"

  28. #include "libavutil/bswap.h"

  29. #include "libavutil/cpu.h"

  30. #include "libavutil/imgutils.h"

  31. #include "libavutil/intreadwrite.h"

  32. #include "libavutil/mathematics.h"

  33. #include "libavutil/mem_internal.h"

  34. #include "libavutil/pixdesc.h"

  35. #include "config.h"

  36. #include "rgb2rgb.h"

  37. #include "swscale_internal.h"

  38. #include "swscale.h"

  39. 

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

  41.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  42.     { 100,  4, 124, 28,  98,  2, 122, 26, },

  43.     {  52, 84,  44, 76,  50, 82,  42, 74, },

  44.     { 116, 20, 108, 12, 114, 18, 106, 10, },

  45.     {  32, 64,  56, 88,  38, 70,  62, 94, },

  46.     {  96,  0, 120, 24, 102,  6, 126, 30, },

  47.     {  48, 80,  40, 72,  54, 86,  46, 78, },

  48.     { 112, 16, 104,  8, 118, 22, 110, 14, },

  49.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  50. };

  51. 

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

  53.     64, 64, 64, 64, 64, 64, 64, 64

  54. };

  55. 

  56. static av_always_inline void fillPlane(uint8_t *plane, int stride, int width,

  57.                                        int height, int y, uint8_t val)

  58. {

  59.     int i;

  60.     uint8_t *ptr = plane + stride * y;

  61.     for (i = 0; i < height; i++) {

  62.         memset(ptr, val, width);

  63.         ptr += stride;

  64.     }

  65. }

  66. 

  67. static void hScale16To19_c(SwsContext *c, int16_t *_dst, int dstW,

  68.                            const uint8_t *_src, const int16_t *filter,

  69.                            const int32_t *filterPos, int filterSize)

  70. {

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

  72.     int i;

  73.     int32_t *dst        = (int32_t *) _dst;

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

  75.     int bits            = desc->comp[0].depth - 1;

  76.     int sh              = bits - 4;

  77. 

  78.     if ((isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8) && desc->comp[0].depth<16) {

  79.         sh = 9;

  80.     } else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */

  81.         sh = 16 - 1 - 4;

  82.     }

  83. 

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

  85.         int j;

  86.         int srcPos = filterPos[i];

  87.         int val    = 0;

  88. 

  89.         for (j = 0; j < filterSize; j++) {

  90.             val += src[srcPos + j] * filter[filterSize * i + j];

  91.         }

  92.         // filter=14 bit, input=16 bit, output=30 bit, >> 11 makes 19 bit

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

  94.     }

  95. }

  96. 

  97. static void hScale16To15_c(SwsContext *c, int16_t *dst, int dstW,

  98.                            const uint8_t *_src, const int16_t *filter,

  99.                            const int32_t *filterPos, int filterSize)

  100. {

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

  102.     int i;

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

  104.     int sh              = desc->comp[0].depth - 1;

  105. 

  106.     if (sh<15) {

  107.         sh = isAnyRGB(c->srcFormat) || c->srcFormat==AV_PIX_FMT_PAL8 ? 13 : (desc->comp[0].depth - 1);

  108.     } else if (desc->flags & AV_PIX_FMT_FLAG_FLOAT) { /* float input are process like uint 16bpc */

  109.         sh = 16 - 1;

  110.     }

  111. 

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

  113.         int j;

  114.         int srcPos = filterPos[i];

  115.         int val    = 0;

  116. 

  117.         for (j = 0; j < filterSize; j++) {

  118.             val += src[srcPos + j] * filter[filterSize * i + j];

  119.         }

  120.         // filter=14 bit, input=16 bit, output=30 bit, >> 15 makes 15 bit

  121.         dst[i] = FFMIN(val >> sh, (1 << 15) - 1);

  122.     }

  123. }

  124. 

  125. // bilinear / bicubic scaling

  126. static void hScale8To15_c(SwsContext *c, int16_t *dst, int dstW,

  127.                           const uint8_t *src, const int16_t *filter,

  128.                           const int32_t *filterPos, int filterSize)

  129. {

  130.     int i;

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

  132.         int j;

  133.         int srcPos = filterPos[i];

  134.         int val    = 0;

  135.         for (j = 0; j < filterSize; j++) {

  136.             val += ((int)src[srcPos + j]) * filter[filterSize * i + j];

  137.         }

  138.         dst[i] = FFMIN(val >> 7, (1 << 15) - 1); // the cubic equation does overflow ...

  139.     }

  140. }

  141. 

  142. static void hScale8To19_c(SwsContext *c, int16_t *_dst, int dstW,

  143.                           const uint8_t *src, const int16_t *filter,

  144.                           const int32_t *filterPos, int filterSize)

  145. {

  146.     int i;

  147.     int32_t *dst = (int32_t *) _dst;

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

  149.         int j;

  150.         int srcPos = filterPos[i];

  151.         int val    = 0;

  152.         for (j = 0; j < filterSize; j++) {

  153.             val += ((int)src[srcPos + j]) * filter[filterSize * i + j];

  154.         }

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

  156.     }

  157. }

  158. 

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

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

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

  162. {

  163.     int i;

  164.     for (i = 0; i < width; i++) {

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

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

  167.     }

  168. }

  169. 

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

  171. {

  172.     int i;

  173.     for (i = 0; i < width; i++) {

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

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

  176.     }

  177. }

  178. 

  179. static void lumRangeToJpeg_c(int16_t *dst, int width)

  180. {

  181.     int i;

  182.     for (i = 0; i < width; i++)

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

  184. }

  185. 

  186. static void lumRangeFromJpeg_c(int16_t *dst, int width)

  187. {

  188.     int i;

  189.     for (i = 0; i < width; i++)

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

  191. }

  192. 

  193. static void chrRangeToJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)

  194. {

  195.     int i;

  196.     int32_t *dstU = (int32_t *) _dstU;

  197.     int32_t *dstV = (int32_t *) _dstV;

  198.     for (i = 0; i < width; i++) {

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

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

  201.     }

  202. }

  203. 

  204. static void chrRangeFromJpeg16_c(int16_t *_dstU, int16_t *_dstV, int width)

  205. {

  206.     int i;

  207.     int32_t *dstU = (int32_t *) _dstU;

  208.     int32_t *dstV = (int32_t *) _dstV;

  209.     for (i = 0; i < width; i++) {

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

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

  212.     }

  213. }

  214. 

  215. static void lumRangeToJpeg16_c(int16_t *_dst, int width)

  216. {

  217.     int i;

  218.     int32_t *dst = (int32_t *) _dst;

  219.     for (i = 0; i < width; i++) {

  220.         dst[i] = ((int)(FFMIN(dst[i], 30189 << 4) * 4769U - (39057361 << 2))) >> 12;

  221.     }

  222. }

  223. 

  224. static void lumRangeFromJpeg16_c(int16_t *_dst, int width)

  225. {

  226.     int i;

  227.     int32_t *dst = (int32_t *) _dst;

  228.     for (i = 0; i < width; i++)

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

  230. }

  231. 

  232. 

  233. #define DEBUG_SWSCALE_BUFFERS 0

  234. #define DEBUG_BUFFERS(...)                      \

  235.     if (DEBUG_SWSCALE_BUFFERS)                  \

  236.         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

  237. 

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

  239.                    int srcStride[], int srcSliceY,

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

  241. {

  242.     /* load a few things into local vars to make the code more readable?

  243.      * and faster */

  244.     const int dstW                   = c->dstW;

  245.     const int dstH                   = c->dstH;

  246. 

  247.     const enum AVPixelFormat dstFormat = c->dstFormat;

  248.     const int flags                  = c->flags;

  249.     int32_t *vLumFilterPos           = c->vLumFilterPos;

  250.     int32_t *vChrFilterPos           = c->vChrFilterPos;

  251. 

  252.     const int vLumFilterSize         = c->vLumFilterSize;

  253.     const int vChrFilterSize         = c->vChrFilterSize;

  254. 

  255.     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;

  256.     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;

  257.     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;

  258.     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;

  259.     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;

  260.     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

  261.     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

  262.     const int chrSrcSliceY           =                srcSliceY >> c->chrSrcVSubSample;

  263.     const int chrSrcSliceH           = AV_CEIL_RSHIFT(srcSliceH,   c->chrSrcVSubSample);

  264.     int should_dither                = isNBPS(c->srcFormat) ||

  265.                                        is16BPS(c->srcFormat);

  266.     int lastDstY;

  267. 

  268.     /* vars which will change and which we need to store back in the context */

  269.     int dstY         = c->dstY;

  270.     int lastInLumBuf = c->lastInLumBuf;

  271.     int lastInChrBuf = c->lastInChrBuf;

  272. 

  273.     int lumStart = 0;

  274.     int lumEnd = c->descIndex[0];

  275.     int chrStart = lumEnd;

  276.     int chrEnd = c->descIndex[1];

  277.     int vStart = chrEnd;

  278.     int vEnd = c->numDesc;

  279.     SwsSlice *src_slice = &c->slice[lumStart];

  280.     SwsSlice *hout_slice = &c->slice[c->numSlice-2];

  281.     SwsSlice *vout_slice = &c->slice[c->numSlice-1];

  282.     SwsFilterDescriptor *desc = c->desc;

  283. 

  284.     int needAlpha = c->needAlpha;

  285. 

  286.     int hasLumHoles = 1;

  287.     int hasChrHoles = 1;

  288. 

  289.     if (isPacked(c->srcFormat)) {

  290.         src[1] =

  291.         src[2] =

  292.         src[3] = src[0];

  293.         srcStride[1] =

  294.         srcStride[2] =

  295.         srcStride[3] = srcStride[0];

  296.     }

  297.     srcStride[1] *= 1 << c->vChrDrop;

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

  299. 

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

  301.                   src[0], srcStride[0], src[1], srcStride[1],

  302.                   src[2], srcStride[2], src[3], srcStride[3],

  303.                   dst[0], dstStride[0], dst[1], dstStride[1],

  304.                   dst[2], dstStride[2], dst[3], dstStride[3]);

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

  306.                   srcSliceY, srcSliceH, dstY, dstH);

  307.     DEBUG_BUFFERS("vLumFilterSize: %d vChrFilterSize: %d\n",

  308.                   vLumFilterSize, vChrFilterSize);

  309. 

  310.     if (dstStride[0]&15 || dstStride[1]&15 ||

  311.         dstStride[2]&15 || dstStride[3]&15) {

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

  313.         if (flags & SWS_PRINT_INFO && !warnedAlready) {

  314.             av_log(c, AV_LOG_WARNING,

  315.                    "Warning: dstStride is not aligned!\n"

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

  317.             warnedAlready = 1;

  318.         }

  319.     }

  320. 

  321.     if (   (uintptr_t)dst[0]&15 || (uintptr_t)dst[1]&15 || (uintptr_t)dst[2]&15

  322.         || (uintptr_t)src[0]&15 || (uintptr_t)src[1]&15 || (uintptr_t)src[2]&15

  323.         || dstStride[0]&15 || dstStride[1]&15 || dstStride[2]&15 || dstStride[3]&15

  324.         || srcStride[0]&15 || srcStride[1]&15 || srcStride[2]&15 || srcStride[3]&15

  325.     ) {

  326.         static int warnedAlready=0;

  327.         int cpu_flags = av_get_cpu_flags();

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

  329.             av_log(c, AV_LOG_WARNING, "Warning: data is not aligned! This can lead to a speed loss\n");

  330.             warnedAlready=1;

  331.         }

  332.     }

  333. 

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

  335.      * will not get executed. This is not really intended but works

  336.      * currently, so people might do it. */

  337.     if (srcSliceY == 0) {

  338.         dstY         = 0;

  339.         lastInLumBuf = -1;

  340.         lastInChrBuf = -1;

  341.     }

  342. 

  343.     if (!should_dither) {

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

  345.     }

  346.     lastDstY = dstY;

  347. 

  348.     ff_init_vscale_pfn(c, yuv2plane1, yuv2planeX, yuv2nv12cX,

  349.                    yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, c->use_mmx_vfilter);

  350. 

  351.     ff_init_slice_from_src(src_slice, (uint8_t**)src, srcStride, c->srcW,

  352.             srcSliceY, srcSliceH, chrSrcSliceY, chrSrcSliceH, 1);

  353. 

  354.     ff_init_slice_from_src(vout_slice, (uint8_t**)dst, dstStride, c->dstW,

  355.             dstY, dstH, dstY >> c->chrDstVSubSample,

  356.             AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample), 0);

  357.     if (srcSliceY == 0) {

  358.         hout_slice->plane[0].sliceY = lastInLumBuf + 1;

  359.         hout_slice->plane[1].sliceY = lastInChrBuf + 1;

  360.         hout_slice->plane[2].sliceY = lastInChrBuf + 1;

  361.         hout_slice->plane[3].sliceY = lastInLumBuf + 1;

  362. 

  363.         hout_slice->plane[0].sliceH =

  364.         hout_slice->plane[1].sliceH =

  365.         hout_slice->plane[2].sliceH =

  366.         hout_slice->plane[3].sliceH = 0;

  367.         hout_slice->width = dstW;

  368.     }

  369. 

  370.     for (; dstY < dstH; dstY++) {

  371.         const int chrDstY = dstY >> c->chrDstVSubSample;

  372.         int use_mmx_vfilter= c->use_mmx_vfilter;

  373. 

  374.         // First line needed as input

  375.         const int firstLumSrcY  = FFMAX(1 - vLumFilterSize, vLumFilterPos[dstY]);

  376.         const int firstLumSrcY2 = FFMAX(1 - vLumFilterSize, vLumFilterPos[FFMIN(dstY | ((1 << c->chrDstVSubSample) - 1), dstH - 1)]);

  377.         // First line needed as input

  378.         const int firstChrSrcY  = FFMAX(1 - vChrFilterSize, vChrFilterPos[chrDstY]);

  379. 

  380.         // Last line needed as input

  381.         int lastLumSrcY  = FFMIN(c->srcH,    firstLumSrcY  + vLumFilterSize) - 1;

  382.         int lastLumSrcY2 = FFMIN(c->srcH,    firstLumSrcY2 + vLumFilterSize) - 1;

  383.         int lastChrSrcY  = FFMIN(c->chrSrcH, firstChrSrcY  + vChrFilterSize) - 1;

  384.         int enough_lines;

  385. 

  386.         int i;

  387.         int posY, cPosY, firstPosY, lastPosY, firstCPosY, lastCPosY;

  388. 

  389.         // handle holes (FAST_BILINEAR & weird filters)

  390.         if (firstLumSrcY > lastInLumBuf) {

  391. 

  392.             hasLumHoles = lastInLumBuf != firstLumSrcY - 1;

  393.             if (hasLumHoles) {

  394.                 hout_slice->plane[0].sliceY = firstLumSrcY;

  395.                 hout_slice->plane[3].sliceY = firstLumSrcY;

  396.                 hout_slice->plane[0].sliceH =

  397.                 hout_slice->plane[3].sliceH = 0;

  398.             }

  399. 

  400.             lastInLumBuf = firstLumSrcY - 1;

  401.         }

  402.         if (firstChrSrcY > lastInChrBuf) {

  403. 

  404.             hasChrHoles = lastInChrBuf != firstChrSrcY - 1;

  405.             if (hasChrHoles) {

  406.                 hout_slice->plane[1].sliceY = firstChrSrcY;

  407.                 hout_slice->plane[2].sliceY = firstChrSrcY;

  408.                 hout_slice->plane[1].sliceH =

  409.                 hout_slice->plane[2].sliceH = 0;

  410.             }

  411. 

  412.             lastInChrBuf = firstChrSrcY - 1;

  413.         }

  414. 

  415.         DEBUG_BUFFERS("dstY: %d\n", dstY);

  416.         DEBUG_BUFFERS("\tfirstLumSrcY: %d lastLumSrcY: %d lastInLumBuf: %d\n",

  417.                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

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

  419.                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

  420. 

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

  422.         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

  423.                        lastChrSrcY < AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample);

  424. 

  425.         if (!enough_lines) {

  426.             lastLumSrcY = srcSliceY + srcSliceH - 1;

  427.             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;

  428.             DEBUG_BUFFERS("buffering slice: lastLumSrcY %d lastChrSrcY %d\n",

  429.                           lastLumSrcY, lastChrSrcY);

  430.         }

  431. 

  432.         av_assert0((lastLumSrcY - firstLumSrcY + 1) <= hout_slice->plane[0].available_lines);

  433.         av_assert0((lastChrSrcY - firstChrSrcY + 1) <= hout_slice->plane[1].available_lines);

  434. 

  435. 

  436.         posY = hout_slice->plane[0].sliceY + hout_slice->plane[0].sliceH;

  437.         if (posY <= lastLumSrcY && !hasLumHoles) {

  438.             firstPosY = FFMAX(firstLumSrcY, posY);

  439.             lastPosY = FFMIN(firstLumSrcY + hout_slice->plane[0].available_lines - 1, srcSliceY + srcSliceH - 1);

  440.         } else {

  441.             firstPosY = posY;

  442.             lastPosY = lastLumSrcY;

  443.         }

  444. 

  445.         cPosY = hout_slice->plane[1].sliceY + hout_slice->plane[1].sliceH;

  446.         if (cPosY <= lastChrSrcY && !hasChrHoles) {

  447.             firstCPosY = FFMAX(firstChrSrcY, cPosY);

  448.             lastCPosY = FFMIN(firstChrSrcY + hout_slice->plane[1].available_lines - 1, AV_CEIL_RSHIFT(srcSliceY + srcSliceH, c->chrSrcVSubSample) - 1);

  449.         } else {

  450.             firstCPosY = cPosY;

  451.             lastCPosY = lastChrSrcY;

  452.         }

  453. 

  454.         ff_rotate_slice(hout_slice, lastPosY, lastCPosY);

  455. 

  456.         if (posY < lastLumSrcY + 1) {

  457.             for (i = lumStart; i < lumEnd; ++i)

  458.                 desc[i].process(c, &desc[i], firstPosY, lastPosY - firstPosY + 1);

  459.         }

  460. 

  461.         lastInLumBuf = lastLumSrcY;

  462. 

  463.         if (cPosY < lastChrSrcY + 1) {

  464.             for (i = chrStart; i < chrEnd; ++i)

  465.                 desc[i].process(c, &desc[i], firstCPosY, lastCPosY - firstCPosY + 1);

  466.         }

  467. 

  468.         lastInChrBuf = lastChrSrcY;

  469. 

  470.         if (!enough_lines)

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

  472. 

  473. #if HAVE_MMX_INLINE

  474.         ff_updateMMXDitherTables(c, dstY);

  475. #endif

  476.         if (should_dither) {

  477.             c->chrDither8 = ff_dither_8x8_128[chrDstY & 7];

  478.             c->lumDither8 = ff_dither_8x8_128[dstY    & 7];

  479.         }

  480.         if (dstY >= dstH - 2) {

  481.             /* hmm looks like we can't use MMX here without overwriting

  482.              * this array's tail */

  483.             ff_sws_init_output_funcs(c, &yuv2plane1, &yuv2planeX, &yuv2nv12cX,

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

  485.             use_mmx_vfilter= 0;

  486.             ff_init_vscale_pfn(c, yuv2plane1, yuv2planeX, yuv2nv12cX,

  487.                            yuv2packed1, yuv2packed2, yuv2packedX, yuv2anyX, use_mmx_vfilter);

  488.         }

  489. 

  490.         {

  491.             for (i = vStart; i < vEnd; ++i)

  492.                 desc[i].process(c, &desc[i], dstY, 1);

  493.         }

  494.     }

  495.     if (isPlanar(dstFormat) && isALPHA(dstFormat) && !needAlpha) {

  496.         int length = dstW;

  497.         int height = dstY - lastDstY;

  498. 

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

  500.             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);

  501.             fillPlane16(dst[3], dstStride[3], length, height, lastDstY,

  502.                     1, desc->comp[3].depth,

  503.                     isBE(dstFormat));

  504.         } else if (is32BPS(dstFormat)) {

  505.             const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(dstFormat);

  506.             fillPlane32(dst[3], dstStride[3], length, height, lastDstY,

  507.                     1, desc->comp[3].depth,

  508.                     isBE(dstFormat), desc->flags & AV_PIX_FMT_FLAG_FLOAT);

  509.         } else

  510.             fillPlane(dst[3], dstStride[3], length, height, lastDstY, 255);

  511.     }

  512. 

  513. #if HAVE_MMXEXT_INLINE

  514.     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

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

  516. #endif

  517.     emms_c();

  518. 

  519.     /* store changed local vars back in the context */

  520.     c->dstY         = dstY;

  521.     c->lastInLumBuf = lastInLumBuf;

  522.     c->lastInChrBuf = lastInChrBuf;

  523. 

  524.     return dstY - lastDstY;

  525. }

  526. 

  527. av_cold void ff_sws_init_range_convert(SwsContext *c)

  528. {

  529.     c->lumConvertRange = NULL;

  530.     c->chrConvertRange = NULL;

  531.     if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {

  532.         if (c->dstBpc <= 14) {

  533.             if (c->srcRange) {

  534.                 c->lumConvertRange = lumRangeFromJpeg_c;

  535.                 c->chrConvertRange = chrRangeFromJpeg_c;

  536.             } else {

  537.                 c->lumConvertRange = lumRangeToJpeg_c;

  538.                 c->chrConvertRange = chrRangeToJpeg_c;

  539.             }

  540.         } else {

  541.             if (c->srcRange) {

  542.                 c->lumConvertRange = lumRangeFromJpeg16_c;

  543.                 c->chrConvertRange = chrRangeFromJpeg16_c;

  544.             } else {

  545.                 c->lumConvertRange = lumRangeToJpeg16_c;

  546.                 c->chrConvertRange = chrRangeToJpeg16_c;

  547.             }

  548.         }

  549.     }

  550. }

  551. 

  552. static av_cold void sws_init_swscale(SwsContext *c)

  553. {

  554.     enum AVPixelFormat srcFormat = c->srcFormat;

  555. 

  556.     ff_sws_init_output_funcs(c, &c->yuv2plane1, &c->yuv2planeX,

  557.                              &c->yuv2nv12cX, &c->yuv2packed1,

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

  559. 

  560.     ff_sws_init_input_funcs(c);

  561. 

  562.     if (c->srcBpc == 8) {

  563.         if (c->dstBpc <= 14) {

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

  565.             if (c->flags & SWS_FAST_BILINEAR) {

  566.                 c->hyscale_fast = ff_hyscale_fast_c;

  567.                 c->hcscale_fast = ff_hcscale_fast_c;

  568.             }

  569.         } else {

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

  571.         }

  572.     } else {

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

  574.                                                  : hScale16To15_c;

  575.     }

  576. 

  577.     ff_sws_init_range_convert(c);

  578. 

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

  580.           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

  581.         c->needs_hcscale = 1;

  582. }

  583. 

  584. SwsFunc ff_getSwsFunc(SwsContext *c)

  585. {

  586.     sws_init_swscale(c);

  587. 

  588.     if (ARCH_PPC)

  589.         ff_sws_init_swscale_ppc(c);

  590.     if (ARCH_X86)

  591.         ff_sws_init_swscale_x86(c);

  592.     if (ARCH_AARCH64)

  593.         ff_sws_init_swscale_aarch64(c);

  594.     if (ARCH_ARM)

  595.         ff_sws_init_swscale_arm(c);

  596. 

  597.     return swscale;

  598. }

  599. 

  600. static void reset_ptr(const uint8_t *src[], enum AVPixelFormat format)

  601. {

  602.     if (!isALPHA(format))

  603.         src[3] = NULL;

  604.     if (!isPlanar(format)) {

  605.         src[3] = src[2] = NULL;

  606. 

  607.         if (!usePal(format))

  608.             src[1] = NULL;

  609.     }

  610. }

  611. 

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

  613.                                 const int linesizes[4])

  614. {

  615.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);

  616.     int i;

  617. 

  618.     av_assert2(desc);

  619. 

  620.     for (i = 0; i < 4; i++) {

  621.         int plane = desc->comp[i].plane;

  622.         if (!data[plane] || !linesizes[plane])

  623.             return 0;

  624.     }

  625. 

  626.     return 1;

  627. }

  628. 

  629. static void xyz12Torgb48(struct SwsContext *c, uint16_t *dst,

  630.                          const uint16_t *src, int stride, int h)

  631. {

  632.     int xp,yp;

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

  634. 

  635.     for (yp=0; yp<h; yp++) {

  636.         for (xp=0; xp+2<stride; xp+=3) {

  637.             int x, y, z, r, g, b;

  638. 

  639.             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

  640.                 x = AV_RB16(src + xp + 0);

  641.                 y = AV_RB16(src + xp + 1);

  642.                 z = AV_RB16(src + xp + 2);

  643.             } else {

  644.                 x = AV_RL16(src + xp + 0);

  645.                 y = AV_RL16(src + xp + 1);

  646.                 z = AV_RL16(src + xp + 2);

  647.             }

  648. 

  649.             x = c->xyzgamma[x>>4];

  650.             y = c->xyzgamma[y>>4];

  651.             z = c->xyzgamma[z>>4];

  652. 

  653.             // convert from XYZlinear to sRGBlinear

  654.             r = c->xyz2rgb_matrix[0][0] * x +

  655.                 c->xyz2rgb_matrix[0][1] * y +

  656.                 c->xyz2rgb_matrix[0][2] * z >> 12;

  657.             g = c->xyz2rgb_matrix[1][0] * x +

  658.                 c->xyz2rgb_matrix[1][1] * y +

  659.                 c->xyz2rgb_matrix[1][2] * z >> 12;

  660.             b = c->xyz2rgb_matrix[2][0] * x +

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

  662.                 c->xyz2rgb_matrix[2][2] * z >> 12;

  663. 

  664.             // limit values to 12-bit depth

  665.             r = av_clip_uintp2(r, 12);

  666.             g = av_clip_uintp2(g, 12);

  667.             b = av_clip_uintp2(b, 12);

  668. 

  669.             // convert from sRGBlinear to RGB and scale from 12bit to 16bit

  670.             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

  671.                 AV_WB16(dst + xp + 0, c->rgbgamma[r] << 4);

  672.                 AV_WB16(dst + xp + 1, c->rgbgamma[g] << 4);

  673.                 AV_WB16(dst + xp + 2, c->rgbgamma[b] << 4);

  674.             } else {

  675.                 AV_WL16(dst + xp + 0, c->rgbgamma[r] << 4);

  676.                 AV_WL16(dst + xp + 1, c->rgbgamma[g] << 4);

  677.                 AV_WL16(dst + xp + 2, c->rgbgamma[b] << 4);

  678.             }

  679.         }

  680.         src += stride;

  681.         dst += stride;

  682.     }

  683. }

  684. 

  685. static void rgb48Toxyz12(struct SwsContext *c, uint16_t *dst,

  686.                          const uint16_t *src, int stride, int h)

  687. {

  688.     int xp,yp;

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

  690. 

  691.     for (yp=0; yp<h; yp++) {

  692.         for (xp=0; xp+2<stride; xp+=3) {

  693.             int x, y, z, r, g, b;

  694. 

  695.             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

  696.                 r = AV_RB16(src + xp + 0);

  697.                 g = AV_RB16(src + xp + 1);

  698.                 b = AV_RB16(src + xp + 2);

  699.             } else {

  700.                 r = AV_RL16(src + xp + 0);

  701.                 g = AV_RL16(src + xp + 1);

  702.                 b = AV_RL16(src + xp + 2);

  703.             }

  704. 

  705.             r = c->rgbgammainv[r>>4];

  706.             g = c->rgbgammainv[g>>4];

  707.             b = c->rgbgammainv[b>>4];

  708. 

  709.             // convert from sRGBlinear to XYZlinear

  710.             x = c->rgb2xyz_matrix[0][0] * r +

  711.                 c->rgb2xyz_matrix[0][1] * g +

  712.                 c->rgb2xyz_matrix[0][2] * b >> 12;

  713.             y = c->rgb2xyz_matrix[1][0] * r +

  714.                 c->rgb2xyz_matrix[1][1] * g +

  715.                 c->rgb2xyz_matrix[1][2] * b >> 12;

  716.             z = c->rgb2xyz_matrix[2][0] * r +

  717.                 c->rgb2xyz_matrix[2][1] * g +

  718.                 c->rgb2xyz_matrix[2][2] * b >> 12;

  719. 

  720.             // limit values to 12-bit depth

  721.             x = av_clip_uintp2(x, 12);

  722.             y = av_clip_uintp2(y, 12);

  723.             z = av_clip_uintp2(z, 12);

  724. 

  725.             // convert from XYZlinear to X'Y'Z' and scale from 12bit to 16bit

  726.             if (desc->flags & AV_PIX_FMT_FLAG_BE) {

  727.                 AV_WB16(dst + xp + 0, c->xyzgammainv[x] << 4);

  728.                 AV_WB16(dst + xp + 1, c->xyzgammainv[y] << 4);

  729.                 AV_WB16(dst + xp + 2, c->xyzgammainv[z] << 4);

  730.             } else {

  731.                 AV_WL16(dst + xp + 0, c->xyzgammainv[x] << 4);

  732.                 AV_WL16(dst + xp + 1, c->xyzgammainv[y] << 4);

  733.                 AV_WL16(dst + xp + 2, c->xyzgammainv[z] << 4);

  734.             }

  735.         }

  736.         src += stride;

  737.         dst += stride;

  738.     }

  739. }

  740. 

  741. /**

  742.  * swscale wrapper, so we don't need to export the SwsContext.

  743.  * Assumes planar YUV to be in YUV order instead of YVU.

  744.  */

  745. int attribute_align_arg sws_scale(struct SwsContext *c,

  746.                                   const uint8_t * const srcSlice[],

  747.                                   const int srcStride[], int srcSliceY,

  748.                                   int srcSliceH, uint8_t *const dst[],

  749.                                   const int dstStride[])

  750. {

  751.     int i, ret;

  752.     const uint8_t *src2[4];

  753.     uint8_t *dst2[4];

  754.     uint8_t *rgb0_tmp = NULL;

  755.     int macro_height = isBayer(c->srcFormat) ? 2 : (1 << c->chrSrcVSubSample);

  756.     // copy strides, so they can safely be modified

  757.     int srcStride2[4];

  758.     int dstStride2[4];

  759.     int srcSliceY_internal = srcSliceY;

  760. 

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

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

  763.         return 0;

  764.     }

  765. 

  766.     for (i=0; i<4; i++) {

  767.         srcStride2[i] = srcStride[i];

  768.         dstStride2[i] = dstStride[i];

  769.     }

  770. 

  771.     if ((srcSliceY & (macro_height-1)) ||

  772.         ((srcSliceH& (macro_height-1)) && srcSliceY + srcSliceH != c->srcH) ||

  773.         srcSliceY + srcSliceH > c->srcH) {

  774.         av_log(c, AV_LOG_ERROR, "Slice parameters %d, %d are invalid\n", srcSliceY, srcSliceH);

  775.         return AVERROR(EINVAL);

  776.     }

  777. 

  778.     if (c->gamma_flag && c->cascaded_context[0]) {

  779.         ret = sws_scale(c->cascaded_context[0],

  780.                     srcSlice, srcStride, srcSliceY, srcSliceH,

  781.                     c->cascaded_tmp, c->cascaded_tmpStride);

  782. 

  783.         if (ret < 0)

  784.             return ret;

  785. 

  786.         if (c->cascaded_context[2])

  787.             ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, c->cascaded1_tmp, c->cascaded1_tmpStride);

  788.         else

  789.             ret = sws_scale(c->cascaded_context[1], (const uint8_t * const *)c->cascaded_tmp, c->cascaded_tmpStride, srcSliceY, srcSliceH, dst, dstStride);

  790. 

  791.         if (ret < 0)

  792.             return ret;

  793. 

  794.         if (c->cascaded_context[2]) {

  795.             ret = sws_scale(c->cascaded_context[2],

  796.                         (const uint8_t * const *)c->cascaded1_tmp, c->cascaded1_tmpStride, c->cascaded_context[1]->dstY - ret, c->cascaded_context[1]->dstY,

  797.                         dst, dstStride);

  798.         }

  799.         return ret;

  800.     }

  801. 

  802.     if (c->cascaded_context[0] && srcSliceY == 0 && srcSliceH == c->cascaded_context[0]->srcH) {

  803.         ret = sws_scale(c->cascaded_context[0],

  804.                         srcSlice, srcStride, srcSliceY, srcSliceH,

  805.                         c->cascaded_tmp, c->cascaded_tmpStride);

  806.         if (ret < 0)

  807.             return ret;

  808.         ret = sws_scale(c->cascaded_context[1],

  809.                         (const uint8_t * const * )c->cascaded_tmp, c->cascaded_tmpStride, 0, c->cascaded_context[0]->dstH,

  810.                         dst, dstStride);

  811.         return ret;

  812.     }

  813. 

  814.     memcpy(src2, srcSlice, sizeof(src2));

  815.     memcpy(dst2, dst, sizeof(dst2));

  816. 

  817.     // do not mess up sliceDir if we have a "trailing" 0-size slice

  818.     if (srcSliceH == 0)

  819.         return 0;

  820. 

  821.     if (!check_image_pointers(srcSlice, c->srcFormat, srcStride)) {

  822.         av_log(c, AV_LOG_ERROR, "bad src image pointers\n");

  823.         return 0;

  824.     }

  825.     if (!check_image_pointers((const uint8_t* const*)dst, c->dstFormat, dstStride)) {

  826.         av_log(c, AV_LOG_ERROR, "bad dst image pointers\n");

  827.         return 0;

  828.     }

  829. 

  830.     if (c->sliceDir == 0 && srcSliceY != 0 && srcSliceY + srcSliceH != c->srcH) {

  831.         av_log(c, AV_LOG_ERROR, "Slices start in the middle!\n");

  832.         return 0;

  833.     }

  834.     if (c->sliceDir == 0) {

  835.         if (srcSliceY == 0) c->sliceDir = 1; else c->sliceDir = -1;

  836.     }

  837. 

  838.     if (usePal(c->srcFormat)) {

  839.         for (i = 0; i < 256; i++) {

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

  841.             if (c->srcFormat == AV_PIX_FMT_PAL8) {

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

  843.                 a = (p >> 24) & 0xFF;

  844.                 r = (p >> 16) & 0xFF;

  845.                 g = (p >>  8) & 0xFF;

  846.                 b =  p        & 0xFF;

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

  848.                 r = ( i >> 5     ) * 36;

  849.                 g = ((i >> 2) & 7) * 36;

  850.                 b = ( i       & 3) * 85;

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

  852.                 b = ( i >> 6     ) * 85;

  853.                 g = ((i >> 3) & 7) * 36;

  854.                 r = ( i       & 7) * 36;

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

  856.                 r = ( i >> 3     ) * 255;

  857.                 g = ((i >> 1) & 3) * 85;

  858.                 b = ( i       & 1) * 255;

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

  860.                 r = g = b = i;

  861.             } else {

  862.                 av_assert1(c->srcFormat == AV_PIX_FMT_BGR4_BYTE);

  863.                 b = ( i >> 3     ) * 255;

  864.                 g = ((i >> 1) & 3) * 85;

  865.                 r = ( i       & 1) * 255;

  866.             }

  867. #define RGB2YUV_SHIFT 15

  868. #define BY ( (int) (0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  869. #define BV (-(int) (0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  870. #define BU ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  871. #define GY ( (int) (0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  872. #define GV (-(int) (0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  873. #define GU (-(int) (0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  874. #define RY ( (int) (0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  875. #define RV ( (int) (0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  876. #define RU (-(int) (0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5))

  877. 

  878.             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  879.             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  880.             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

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

  882. 

  883.             switch (c->dstFormat) {

  884.             case AV_PIX_FMT_BGR32:

  885. #if !HAVE_BIGENDIAN

  886.             case AV_PIX_FMT_RGB24:

  887. #endif

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

  889.                 break;

  890.             case AV_PIX_FMT_BGR32_1:

  891. #if HAVE_BIGENDIAN

  892.             case AV_PIX_FMT_BGR24:

  893. #endif

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

  895.                 break;

  896.             case AV_PIX_FMT_RGB32_1:

  897. #if HAVE_BIGENDIAN

  898.             case AV_PIX_FMT_RGB24:

  899. #endif

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

  901.                 break;

  902.             case AV_PIX_FMT_RGB32:

  903. #if !HAVE_BIGENDIAN

  904.             case AV_PIX_FMT_BGR24:

  905. #endif

  906.             default:

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

  908.             }

  909.         }

  910.     }

  911. 

  912.     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {

  913.         uint8_t *base;

  914.         int x,y;

  915.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  916.         if (!rgb0_tmp)

  917.             return AVERROR(ENOMEM);

  918. 

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

  920.         for (y=0; y<srcSliceH; y++){

  921.             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);

  922.             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {

  923.                 base[ srcStride[0]*y + x] = 0xFF;

  924.             }

  925.         }

  926.         src2[0] = base;

  927.     }

  928. 

  929.     if (c->srcXYZ && !(c->dstXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  930.         uint8_t *base;

  931.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  932.         if (!rgb0_tmp)

  933.             return AVERROR(ENOMEM);

  934. 

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

  936. 

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

  938.         src2[0] = base;

  939.     }

  940. 

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

  942.         for (i = 0; i < 4; i++)

  943.             memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));

  944. 

  945.     if (c->sliceDir != 1) {

  946.         // slices go from bottom to top => we flip the image internally

  947.         for (i=0; i<4; i++) {

  948.             srcStride2[i] *= -1;

  949.             dstStride2[i] *= -1;

  950.         }

  951. 

  952.         src2[0] += (srcSliceH - 1) * srcStride[0];

  953.         if (!usePal(c->srcFormat))

  954.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  955.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  956.         src2[3] += (srcSliceH - 1) * srcStride[3];

  957.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  958.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  959.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  960.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  961. 

  962.         srcSliceY_internal = c->srcH-srcSliceY-srcSliceH;

  963.     }

  964.     reset_ptr(src2, c->srcFormat);

  965.     reset_ptr((void*)dst2, c->dstFormat);

  966. 

  967.     /* reset slice direction at end of frame */

  968.     if (srcSliceY_internal + srcSliceH == c->srcH)

  969.         c->sliceDir = 0;

  970.     ret = c->swscale(c, src2, srcStride2, srcSliceY_internal, srcSliceH, dst2, dstStride2);

  971. 

  972.     if (c->dstXYZ && !(c->srcXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  973.         int dstY = c->dstY ? c->dstY : srcSliceY + srcSliceH;

  974.         uint16_t *dst16 = (uint16_t*)(dst2[0] + (dstY - ret) * dstStride2[0]);

  975.         av_assert0(dstY >= ret);

  976.         av_assert0(ret >= 0);

  977.         av_assert0(c->dstH >= dstY);

  978. 

  979.         /* replace on the same data */

  980.         rgb48Toxyz12(c, dst16, dst16, dstStride2[0]/2, ret);

  981.     }

  982. 

  983.     av_free(rgb0_tmp);

  984.     return ret;

  985. }