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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/pixdesc.h"

  34. #include "config.h"

  35. #include "rgb2rgb.h"

  36. #include "swscale_internal.h"

  37. #include "swscale.h"

  38. 

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

  40.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  41.     { 100,  4, 124, 28,  98,  2, 122, 26, },

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

  43.     { 116, 20, 108, 12, 114, 18, 106, 10, },

  44.     {  32, 64,  56, 88,  38, 70,  62, 94, },

  45.     {  96,  0, 120, 24, 102,  6, 126, 30, },

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

  47.     { 112, 16, 104,  8, 118, 22, 110, 14, },

  48.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  49. };

  50. 

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

  52.     64, 64, 64, 64, 64, 64, 64, 64

  53. };

  54. 

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

  56.                                        int height, int y, uint8_t val)

  57. {

  58.     int i;

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

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

  61.         memset(ptr, val, width);

  62.         ptr += stride;

  63.     }

  64. }

  65. 

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

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

  68.                            const int32_t *filterPos, int filterSize)

  69. {

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

  71.     int i;

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

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

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

  75.     int sh              = bits - 4;

  76. 

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

  78.         sh = 9;

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

  80.         sh = 16 - 1 - 4;

  81.     }

  82. 

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

  84.         int j;

  85.         int srcPos = filterPos[i];

  86.         int val    = 0;

  87. 

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

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

  90.         }

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

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

  93.     }

  94. }

  95. 

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

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

  98.                            const int32_t *filterPos, int filterSize)

  99. {

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

  101.     int i;

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

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

  104. 

  105.     if (sh<15) {

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

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

  108.         sh = 16 - 1;

  109.     }

  110. 

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

  112.         int j;

  113.         int srcPos = filterPos[i];

  114.         int val    = 0;

  115. 

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

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

  118.         }

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

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

  121.     }

  122. }

  123. 

  124. // bilinear / bicubic scaling

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

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

  127.                           const int32_t *filterPos, int filterSize)

  128. {

  129.     int i;

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

  131.         int j;

  132.         int srcPos = filterPos[i];

  133.         int val    = 0;

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

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

  136.         }

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

  138.     }

  139. }

  140. 

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

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

  143.                           const int32_t *filterPos, int filterSize)

  144. {

  145.     int i;

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

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

  148.         int j;

  149.         int srcPos = filterPos[i];

  150.         int val    = 0;

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

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

  153.         }

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

  155.     }

  156. }

  157. 

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

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

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

  161. {

  162.     int i;

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

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

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

  166.     }

  167. }

  168. 

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

  170. {

  171.     int i;

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

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

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

  175.     }

  176. }

  177. 

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

  179. {

  180.     int i;

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

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

  183. }

  184. 

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

  186. {

  187.     int i;

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

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

  190. }

  191. 

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

  193. {

  194.     int i;

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

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

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

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

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

  200.     }

  201. }

  202. 

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

  204. {

  205.     int i;

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

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

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

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

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

  211.     }

  212. }

  213. 

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

  215. {

  216.     int i;

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

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

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

  220.     }

  221. }

  222. 

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

  224. {

  225.     int i;

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

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

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

  229. }

  230. 

  231. 

  232. #define DEBUG_SWSCALE_BUFFERS 0

  233. #define DEBUG_BUFFERS(...)                      \

  234.     if (DEBUG_SWSCALE_BUFFERS)                  \

  235.         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

  236. 

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

  238.                    int srcStride[], int srcSliceY,

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

  240. {

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

  242.      * and faster */

  243.     const int dstW                   = c->dstW;

  244.     const int dstH                   = c->dstH;

  245. 

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

  247.     const int flags                  = c->flags;

  248.     int32_t *vLumFilterPos           = c->vLumFilterPos;

  249.     int32_t *vChrFilterPos           = c->vChrFilterPos;

  250. 

  251.     const int vLumFilterSize         = c->vLumFilterSize;

  252.     const int vChrFilterSize         = c->vChrFilterSize;

  253. 

  254.     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;

  255.     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;

  256.     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;

  257.     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;

  258.     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;

  259.     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

  260.     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

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

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

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

  264.                                        is16BPS(c->srcFormat);

  265.     int lastDstY;

  266. 

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

  268.     int dstY         = c->dstY;

  269.     int lumBufIndex  = c->lumBufIndex;

  270.     int chrBufIndex  = c->chrBufIndex;

  271.     int lastInLumBuf = c->lastInLumBuf;

  272.     int lastInChrBuf = c->lastInChrBuf;

  273. 

  274.     int lumStart = 0;

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

  276.     int chrStart = lumEnd;

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

  278.     int vStart = chrEnd;

  279.     int vEnd = c->numDesc;

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

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

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

  283.     SwsFilterDescriptor *desc = c->desc;

  284. 

  285.     int needAlpha = c->needAlpha;

  286. 

  287.     int hasLumHoles = 1;

  288.     int hasChrHoles = 1;

  289. 

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

  291.         src[1] =

  292.         src[2] =

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

  294.         srcStride[1] =

  295.         srcStride[2] =

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

  297.     }

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

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

  300. 

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

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

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

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

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

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

  307.                   srcSliceY, srcSliceH, dstY, dstH);

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

  309.                   vLumFilterSize, vChrFilterSize);

  310. 

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

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

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

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

  315.             av_log(c, AV_LOG_WARNING,

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

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

  318.             warnedAlready = 1;

  319.         }

  320.     }

  321. 

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

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

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

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

  326.     ) {

  327.         static int warnedAlready=0;

  328.         int cpu_flags = av_get_cpu_flags();

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

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

  331.             warnedAlready=1;

  332.         }

  333.     }

  334. 

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

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

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

  338.     if (srcSliceY == 0) {

  339.         lumBufIndex  = -1;

  340.         chrBufIndex  = -1;

  341.         dstY         = 0;

  342.         lastInLumBuf = -1;

  343.         lastInChrBuf = -1;

  344.     }

  345. 

  346.     if (!should_dither) {

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

  348.     }

  349.     lastDstY = dstY;

  350. 

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

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

  353. 

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

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

  356. 

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

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

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

  360.     if (srcSliceY == 0) {

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

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

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

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

  365. 

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

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

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

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

  370.         hout_slice->width = dstW;

  371.     }

  372. 

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

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

  375.         int use_mmx_vfilter= c->use_mmx_vfilter;

  376. 

  377.         // First line needed as input

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

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

  380.         // First line needed as input

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

  382. 

  383.         // Last line needed as input

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

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

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

  387.         int enough_lines;

  388. 

  389.         int i;

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

  391. 

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

  393.         if (firstLumSrcY > lastInLumBuf) {

  394. 

  395.             hasLumHoles = lastInLumBuf != firstLumSrcY - 1;

  396.             if (hasLumHoles) {

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

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

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

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

  401.             }

  402. 

  403.             lastInLumBuf = firstLumSrcY - 1;

  404.         }

  405.         if (firstChrSrcY > lastInChrBuf) {

  406. 

  407.             hasChrHoles = lastInChrBuf != firstChrSrcY - 1;

  408.             if (hasChrHoles) {

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

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

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

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

  413.             }

  414. 

  415.             lastInChrBuf = firstChrSrcY - 1;

  416.         }

  417. 

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

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

  420.                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

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

  422.                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

  423. 

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

  425.         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

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

  427. 

  428.         if (!enough_lines) {

  429.             lastLumSrcY = srcSliceY + srcSliceH - 1;

  430.             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;

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

  432.                           lastLumSrcY, lastChrSrcY);

  433.         }

  434. 

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

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

  437. 

  438. 

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

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

  441.             firstPosY = FFMAX(firstLumSrcY, posY);

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

  443.         } else {

  444.             firstPosY = posY;

  445.             lastPosY = lastLumSrcY;

  446.         }

  447. 

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

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

  450.             firstCPosY = FFMAX(firstChrSrcY, cPosY);

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

  452.         } else {

  453.             firstCPosY = cPosY;

  454.             lastCPosY = lastChrSrcY;

  455.         }

  456. 

  457.         ff_rotate_slice(hout_slice, lastPosY, lastCPosY);

  458. 

  459.         if (posY < lastLumSrcY + 1) {

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

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

  462.         }

  463. 

  464.         lumBufIndex += lastLumSrcY - lastInLumBuf;

  465.         lastInLumBuf = lastLumSrcY;

  466. 

  467.         if (cPosY < lastChrSrcY + 1) {

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

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

  470.         }

  471. 

  472.         chrBufIndex += lastChrSrcY - lastInChrBuf;

  473.         lastInChrBuf = lastChrSrcY;

  474. 

  475.         // wrap buf index around to stay inside the ring buffer

  476.         if (lumBufIndex >= vLumFilterSize)

  477.             lumBufIndex -= vLumFilterSize;

  478.         if (chrBufIndex >= vChrFilterSize)

  479.             chrBufIndex -= vChrFilterSize;

  480.         if (!enough_lines)

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

  482. 

  483. #if HAVE_MMX_INLINE

  484.         ff_updateMMXDitherTables(c, dstY, lumBufIndex, chrBufIndex,

  485.                               lastInLumBuf, lastInChrBuf);

  486. #endif

  487.         if (should_dither) {

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

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

  490.         }

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

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

  493.              * this array's tail */

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

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

  496.             use_mmx_vfilter= 0;

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

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

  499.         }

  500. 

  501.         {

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

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

  504.         }

  505.     }

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

  507.         int length = dstW;

  508.         int height = dstY - lastDstY;

  509. 

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

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

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

  513.                     1, desc->comp[3].depth,

  514.                     isBE(dstFormat));

  515.         } else

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

  517.     }

  518. 

  519. #if HAVE_MMXEXT_INLINE

  520.     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

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

  522. #endif

  523.     emms_c();

  524. 

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

  526.     c->dstY         = dstY;

  527.     c->lumBufIndex  = lumBufIndex;

  528.     c->chrBufIndex  = chrBufIndex;

  529.     c->lastInLumBuf = lastInLumBuf;

  530.     c->lastInChrBuf = lastInChrBuf;

  531. 

  532.     return dstY - lastDstY;

  533. }

  534. 

  535. av_cold void ff_sws_init_range_convert(SwsContext *c)

  536. {

  537.     c->lumConvertRange = NULL;

  538.     c->chrConvertRange = NULL;

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

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

  541.             if (c->srcRange) {

  542.                 c->lumConvertRange = lumRangeFromJpeg_c;

  543.                 c->chrConvertRange = chrRangeFromJpeg_c;

  544.             } else {

  545.                 c->lumConvertRange = lumRangeToJpeg_c;

  546.                 c->chrConvertRange = chrRangeToJpeg_c;

  547.             }

  548.         } else {

  549.             if (c->srcRange) {

  550.                 c->lumConvertRange = lumRangeFromJpeg16_c;

  551.                 c->chrConvertRange = chrRangeFromJpeg16_c;

  552.             } else {

  553.                 c->lumConvertRange = lumRangeToJpeg16_c;

  554.                 c->chrConvertRange = chrRangeToJpeg16_c;

  555.             }

  556.         }

  557.     }

  558. }

  559. 

  560. static av_cold void sws_init_swscale(SwsContext *c)

  561. {

  562.     enum AVPixelFormat srcFormat = c->srcFormat;

  563. 

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

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

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

  567. 

  568.     ff_sws_init_input_funcs(c);

  569. 

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

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

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

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

  574.                 c->hyscale_fast = ff_hyscale_fast_c;

  575.                 c->hcscale_fast = ff_hcscale_fast_c;

  576.             }

  577.         } else {

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

  579.         }

  580.     } else {

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

  582.                                                  : hScale16To15_c;

  583.     }

  584. 

  585.     ff_sws_init_range_convert(c);

  586. 

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

  588.           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

  589.         c->needs_hcscale = 1;

  590. }

  591. 

  592. SwsFunc ff_getSwsFunc(SwsContext *c)

  593. {

  594.     sws_init_swscale(c);

  595. 

  596.     if (ARCH_PPC)

  597.         ff_sws_init_swscale_ppc(c);

  598.     if (ARCH_X86)

  599.         ff_sws_init_swscale_x86(c);

  600.     if (ARCH_AARCH64)

  601.         ff_sws_init_swscale_aarch64(c);

  602.     if (ARCH_ARM)

  603.         ff_sws_init_swscale_arm(c);

  604. 

  605.     return swscale;

  606. }

  607. 

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

  609. {

  610.     if (!isALPHA(format))

  611.         src[3] = NULL;

  612.     if (!isPlanar(format)) {

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

  614. 

  615.         if (!usePal(format))

  616.             src[1] = NULL;

  617.     }

  618. }

  619. 

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

  621.                                 const int linesizes[4])

  622. {

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

  624.     int i;

  625. 

  626.     av_assert2(desc);

  627. 

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

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

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

  631.             return 0;

  632.     }

  633. 

  634.     return 1;

  635. }

  636. 

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

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

  639. {

  640.     int xp,yp;

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

  642. 

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

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

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

  646. 

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

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

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

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

  651.             } else {

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

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

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

  655.             }

  656. 

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

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

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

  660. 

  661.             // convert from XYZlinear to sRGBlinear

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

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

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

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

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

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

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

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

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

  671. 

  672.             // limit values to 12-bit depth

  673.             r = av_clip_uintp2(r, 12);

  674.             g = av_clip_uintp2(g, 12);

  675.             b = av_clip_uintp2(b, 12);

  676. 

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

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

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

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

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

  682.             } else {

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

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

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

  686.             }

  687.         }

  688.         src += stride;

  689.         dst += stride;

  690.     }

  691. }

  692. 

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

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

  695. {

  696.     int xp,yp;

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

  698. 

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

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

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

  702. 

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

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

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

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

  707.             } else {

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

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

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

  711.             }

  712. 

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

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

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

  716. 

  717.             // convert from sRGBlinear to XYZlinear

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

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

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

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

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

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

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

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

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

  727. 

  728.             // limit values to 12-bit depth

  729.             x = av_clip_uintp2(x, 12);

  730.             y = av_clip_uintp2(y, 12);

  731.             z = av_clip_uintp2(z, 12);

  732. 

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

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

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

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

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

  738.             } else {

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

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

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

  742.             }

  743.         }

  744.         src += stride;

  745.         dst += stride;

  746.     }

  747. }

  748. 

  749. /**

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

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

  752.  */

  753. int attribute_align_arg sws_scale(struct SwsContext *c,

  754.                                   const uint8_t * const srcSlice[],

  755.                                   const int srcStride[], int srcSliceY,

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

  757.                                   const int dstStride[])

  758. {

  759.     int i, ret;

  760.     const uint8_t *src2[4];

  761.     uint8_t *dst2[4];

  762.     uint8_t *rgb0_tmp = NULL;

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

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

  765.     int srcStride2[4];

  766.     int dstStride2[4];

  767.     int srcSliceY_internal = srcSliceY;

  768. 

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

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

  771.         return 0;

  772.     }

  773. 

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

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

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

  777.     }

  778. 

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

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

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

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

  783.         return AVERROR(EINVAL);

  784.     }

  785. 

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

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

  788.                     srcSlice, srcStride, srcSliceY, srcSliceH,

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

  790. 

  791.         if (ret < 0)

  792.             return ret;

  793. 

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

  795.             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);

  796.         else

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

  798. 

  799.         if (ret < 0)

  800.             return ret;

  801. 

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

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

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

  805.                         dst, dstStride);

  806.         }

  807.         return ret;

  808.     }

  809. 

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

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

  812.                         srcSlice, srcStride, srcSliceY, srcSliceH,

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

  814.         if (ret < 0)

  815.             return ret;

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

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

  818.                         dst, dstStride);

  819.         return ret;

  820.     }

  821. 

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

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

  824. 

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

  826.     if (srcSliceH == 0)

  827.         return 0;

  828. 

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

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

  831.         return 0;

  832.     }

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

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

  835.         return 0;

  836.     }

  837. 

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

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

  840.         return 0;

  841.     }

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

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

  844.     }

  845. 

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

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

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

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

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

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

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

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

  854.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  868.                 r = g = b = i;

  869.             } else {

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

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

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

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

  874.             }

  875. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  885. 

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

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

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

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

  890. 

  891.             switch (c->dstFormat) {

  892.             case AV_PIX_FMT_BGR32:

  893. #if !HAVE_BIGENDIAN

  894.             case AV_PIX_FMT_RGB24:

  895. #endif

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

  897.                 break;

  898.             case AV_PIX_FMT_BGR32_1:

  899. #if HAVE_BIGENDIAN

  900.             case AV_PIX_FMT_BGR24:

  901. #endif

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

  903.                 break;

  904.             case AV_PIX_FMT_RGB32_1:

  905. #if HAVE_BIGENDIAN

  906.             case AV_PIX_FMT_RGB24:

  907. #endif

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

  909.                 break;

  910.             case AV_PIX_FMT_RGB32:

  911. #if !HAVE_BIGENDIAN

  912.             case AV_PIX_FMT_BGR24:

  913. #endif

  914.             default:

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

  916.             }

  917.         }

  918.     }

  919. 

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

  921.         uint8_t *base;

  922.         int x,y;

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

  924.         if (!rgb0_tmp)

  925.             return AVERROR(ENOMEM);

  926. 

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

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

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

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

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

  932.             }

  933.         }

  934.         src2[0] = base;

  935.     }

  936. 

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

  938.         uint8_t *base;

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

  940.         if (!rgb0_tmp)

  941.             return AVERROR(ENOMEM);

  942. 

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

  944. 

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

  946.         src2[0] = base;

  947.     }

  948. 

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

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

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

  952. 

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

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

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

  956.             srcStride2[i] *= -1;

  957.             dstStride2[i] *= -1;

  958.         }

  959. 

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

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

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

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

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

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

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

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

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

  969. 

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

  971.     }

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

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

  974. 

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

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

  977.         c->sliceDir = 0;

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

  979. 

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

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

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

  983.         av_assert0(dstY >= ret);

  984.         av_assert0(ret >= 0);

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

  986. 

  987.         /* replace on the same data */

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

  989.     }

  990. 

  991.     av_free(rgb0_tmp);

  992.     return ret;

  993. }