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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/intreadwrite.h"

  31. #include "libavutil/mathematics.h"

  32. #include "libavutil/pixdesc.h"

  33. #include "config.h"

  34. #include "rgb2rgb.h"

  35. #include "swscale_internal.h"

  36. #include "swscale.h"

  37. 

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

  39.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  40.     { 100,  4, 124, 28,  98,  2, 122, 26, },

  41.     {  52, 84,  44, 76,  50, 82,  42, 74, },

  42.     { 116, 20, 108, 12, 114, 18, 106, 10, },

  43.     {  32, 64,  56, 88,  38, 70,  62, 94, },

  44.     {  96,  0, 120, 24, 102,  6, 126, 30, },

  45.     {  48, 80,  40, 72,  54, 86,  46, 78, },

  46.     { 112, 16, 104,  8, 118, 22, 110, 14, },

  47.     {  36, 68,  60, 92,  34, 66,  58, 90, },

  48. };

  49. 

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

  51.     64, 64, 64, 64, 64, 64, 64, 64

  52. };

  53. 

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

  55.                                        int height, int y, uint8_t val)

  56. {

  57.     int i;

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

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

  60.         memset(ptr, val, width);

  61.         ptr += stride;

  62.     }

  63. }

  64. 

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

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

  67.                            const int32_t *filterPos, int filterSize)

  68. {

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

  70.     int i;

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

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

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

  74.     int sh              = bits - 4;

  75. 

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

  77.         sh= 9;

  78. 

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

  80.         int j;

  81.         int srcPos = filterPos[i];

  82.         int val    = 0;

  83. 

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

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

  86.         }

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

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

  89.     }

  90. }

  91. 

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

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

  94.                            const int32_t *filterPos, int filterSize)

  95. {

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

  97.     int i;

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

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

  100. 

  101.     if(sh<15)

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

  103. 

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

  105.         int j;

  106.         int srcPos = filterPos[i];

  107.         int val    = 0;

  108. 

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

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

  111.         }

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

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

  114.     }

  115. }

  116. 

  117. // bilinear / bicubic scaling

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

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

  120.                           const int32_t *filterPos, int filterSize)

  121. {

  122.     int i;

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

  124.         int j;

  125.         int srcPos = filterPos[i];

  126.         int val    = 0;

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

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

  129.         }

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

  131.     }

  132. }

  133. 

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

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

  136.                           const int32_t *filterPos, int filterSize)

  137. {

  138.     int i;

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

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

  141.         int j;

  142.         int srcPos = filterPos[i];

  143.         int val    = 0;

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

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

  146.         }

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

  148.     }

  149. }

  150. 

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

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

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

  154. {

  155.     int i;

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

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

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

  159.     }

  160. }

  161. 

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

  163. {

  164.     int i;

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

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

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

  168.     }

  169. }

  170. 

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

  172. {

  173.     int i;

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

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

  176. }

  177. 

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

  179. {

  180.     int i;

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

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

  183. }

  184. 

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

  186. {

  187.     int i;

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

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

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

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

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

  193.     }

  194. }

  195. 

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

  197. {

  198.     int i;

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

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

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

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

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

  204.     }

  205. }

  206. 

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

  208. {

  209.     int i;

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

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

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

  213. }

  214. 

  215. static void lumRangeFromJpeg16_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] = (dst[i]*(14071/4) + (33561947<<4)/4)>>12;

  221. }

  222. 

  223. static void hyscale_fast_c(SwsContext *c, int16_t *dst, int dstWidth,

  224.                            const uint8_t *src, int srcW, int xInc)

  225. {

  226.     int i;

  227.     unsigned int xpos = 0;

  228.     for (i = 0; i < dstWidth; i++) {

  229.         register unsigned int xx     = xpos >> 16;

  230.         register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

  231.         dst[i] = (src[xx] << 7) + (src[xx + 1] - src[xx]) * xalpha;

  232.         xpos  += xInc;

  233.     }

  234.     for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--)

  235.         dst[i] = src[srcW-1]*128;

  236. }

  237. 

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

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

  240.                                      const uint8_t *src_in[4],

  241.                                      int srcW, int xInc,

  242.                                      const int16_t *hLumFilter,

  243.                                      const int32_t *hLumFilterPos,

  244.                                      int hLumFilterSize,

  245.                                      uint8_t *formatConvBuffer,

  246.                                      uint32_t *pal, int isAlpha)

  247. {

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

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

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

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

  252. 

  253.     if (toYV12) {

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

  255.         src = formatConvBuffer;

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

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

  258.         src = formatConvBuffer;

  259.     } else if (c->readAlpPlanar && isAlpha) {

  260.         c->readAlpPlanar(formatConvBuffer, src_in, srcW, NULL);

  261.         src = formatConvBuffer;

  262.     }

  263. 

  264.     if (!c->hyscale_fast) {

  265.         c->hyScale(c, dst, dstWidth, src, hLumFilter,

  266.                    hLumFilterPos, hLumFilterSize);

  267.     } else { // fast bilinear upscale / crap downscale

  268.         c->hyscale_fast(c, dst, dstWidth, src, srcW, xInc);

  269.     }

  270. 

  271.     if (convertRange)

  272.         convertRange(dst, dstWidth);

  273. }

  274. 

  275. static void hcscale_fast_c(SwsContext *c, int16_t *dst1, int16_t *dst2,

  276.                            int dstWidth, const uint8_t *src1,

  277.                            const uint8_t *src2, int srcW, int xInc)

  278. {

  279.     int i;

  280.     unsigned int xpos = 0;

  281.     for (i = 0; i < dstWidth; i++) {

  282.         register unsigned int xx     = xpos >> 16;

  283.         register unsigned int xalpha = (xpos & 0xFFFF) >> 9;

  284.         dst1[i] = (src1[xx] * (xalpha ^ 127) + src1[xx + 1] * xalpha);

  285.         dst2[i] = (src2[xx] * (xalpha ^ 127) + src2[xx + 1] * xalpha);

  286.         xpos   += xInc;

  287.     }

  288.     for (i=dstWidth-1; (i*xInc)>>16 >=srcW-1; i--) {

  289.         dst1[i] = src1[srcW-1]*128;

  290.         dst2[i] = src2[srcW-1]*128;

  291.     }

  292. }

  293. 

  294. static av_always_inline void hcscale(SwsContext *c, int16_t *dst1,

  295.                                      int16_t *dst2, int dstWidth,

  296.                                      const uint8_t *src_in[4],

  297.                                      int srcW, int xInc,

  298.                                      const int16_t *hChrFilter,

  299.                                      const int32_t *hChrFilterPos,

  300.                                      int hChrFilterSize,

  301.                                      uint8_t *formatConvBuffer, uint32_t *pal)

  302. {

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

  304.     if (c->chrToYV12) {

  305.         uint8_t *buf2 = formatConvBuffer +

  306.                         FFALIGN(srcW*2+78, 16);

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

  308.         src1= formatConvBuffer;

  309.         src2= buf2;

  310.     } else if (c->readChrPlanar) {

  311.         uint8_t *buf2 = formatConvBuffer +

  312.                         FFALIGN(srcW*2+78, 16);

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

  314.         src1 = formatConvBuffer;

  315.         src2 = buf2;

  316.     }

  317. 

  318.     if (!c->hcscale_fast) {

  319.         c->hcScale(c, dst1, dstWidth, src1, hChrFilter, hChrFilterPos, hChrFilterSize);

  320.         c->hcScale(c, dst2, dstWidth, src2, hChrFilter, hChrFilterPos, hChrFilterSize);

  321.     } else { // fast bilinear upscale / crap downscale

  322.         c->hcscale_fast(c, dst1, dst2, dstWidth, src1, src2, srcW, xInc);

  323.     }

  324. 

  325.     if (c->chrConvertRange)

  326.         c->chrConvertRange(dst1, dst2, dstWidth);

  327. }

  328. 

  329. #define DEBUG_SWSCALE_BUFFERS 0

  330. #define DEBUG_BUFFERS(...)                      \

  331.     if (DEBUG_SWSCALE_BUFFERS)                  \

  332.         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

  333. 

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

  335.                    int srcStride[], int srcSliceY,

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

  337. {

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

  339.      * and faster */

  340.     const int srcW                   = c->srcW;

  341.     const int dstW                   = c->dstW;

  342.     const int dstH                   = c->dstH;

  343.     const int chrDstW                = c->chrDstW;

  344.     const int chrSrcW                = c->chrSrcW;

  345.     const int lumXInc                = c->lumXInc;

  346.     const int chrXInc                = c->chrXInc;

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

  348.     const int flags                  = c->flags;

  349.     int32_t *vLumFilterPos           = c->vLumFilterPos;

  350.     int32_t *vChrFilterPos           = c->vChrFilterPos;

  351.     int32_t *hLumFilterPos           = c->hLumFilterPos;

  352.     int32_t *hChrFilterPos           = c->hChrFilterPos;

  353.     int16_t *hLumFilter              = c->hLumFilter;

  354.     int16_t *hChrFilter              = c->hChrFilter;

  355.     int32_t *lumMmxFilter            = c->lumMmxFilter;

  356.     int32_t *chrMmxFilter            = c->chrMmxFilter;

  357.     const int vLumFilterSize         = c->vLumFilterSize;

  358.     const int vChrFilterSize         = c->vChrFilterSize;

  359.     const int hLumFilterSize         = c->hLumFilterSize;

  360.     const int hChrFilterSize         = c->hChrFilterSize;

  361.     int16_t **lumPixBuf              = c->lumPixBuf;

  362.     int16_t **chrUPixBuf             = c->chrUPixBuf;

  363.     int16_t **chrVPixBuf             = c->chrVPixBuf;

  364.     int16_t **alpPixBuf              = c->alpPixBuf;

  365.     const int vLumBufSize            = c->vLumBufSize;

  366.     const int vChrBufSize            = c->vChrBufSize;

  367.     uint8_t *formatConvBuffer        = c->formatConvBuffer;

  368.     uint32_t *pal                    = c->pal_yuv;

  369.     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;

  370.     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;

  371.     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;

  372.     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;

  373.     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;

  374.     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

  375.     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

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

  377.     const int chrSrcSliceH           = FF_CEIL_RSHIFT(srcSliceH,   c->chrSrcVSubSample);

  378.     int should_dither                = is9_OR_10BPS(c->srcFormat) ||

  379.                                        is16BPS(c->srcFormat);

  380.     int lastDstY;

  381. 

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

  383.     int dstY         = c->dstY;

  384.     int lumBufIndex  = c->lumBufIndex;

  385.     int chrBufIndex  = c->chrBufIndex;

  386.     int lastInLumBuf = c->lastInLumBuf;

  387.     int lastInChrBuf = c->lastInChrBuf;

  388. 

  389.     if (!usePal(c->srcFormat)) {

  390.         pal = c->input_rgb2yuv_table;

  391.     }

  392. 

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

  394.         src[0] =

  395.         src[1] =

  396.         src[2] =

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

  398.         srcStride[0] =

  399.         srcStride[1] =

  400.         srcStride[2] =

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

  402.     }

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

  404.     srcStride[2] <<= c->vChrDrop;

  405. 

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

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

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

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

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

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

  412.                   srcSliceY, srcSliceH, dstY, dstH);

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

  414.                   vLumFilterSize, vLumBufSize, vChrFilterSize, vChrBufSize);

  415. 

  416.     if (dstStride[0]%16 !=0 || dstStride[1]%16 !=0 ||

  417.         dstStride[2]%16 !=0 || dstStride[3]%16 != 0) {

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

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

  420.             av_log(c, AV_LOG_WARNING,

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

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

  423.             warnedAlready = 1;

  424.         }

  425.     }

  426. 

  427.     if (   (uintptr_t)dst[0]%16 || (uintptr_t)dst[1]%16 || (uintptr_t)dst[2]%16

  428.         || (uintptr_t)src[0]%16 || (uintptr_t)src[1]%16 || (uintptr_t)src[2]%16

  429.         || dstStride[0]%16 || dstStride[1]%16 || dstStride[2]%16 || dstStride[3]%16

  430.         || srcStride[0]%16 || srcStride[1]%16 || srcStride[2]%16 || srcStride[3]%16

  431.     ) {

  432.         static int warnedAlready=0;

  433.         int cpu_flags = av_get_cpu_flags();

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

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

  436.             warnedAlready=1;

  437.         }

  438.     }

  439. 

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

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

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

  443.     if (srcSliceY == 0) {

  444.         lumBufIndex  = -1;

  445.         chrBufIndex  = -1;

  446.         dstY         = 0;

  447.         lastInLumBuf = -1;

  448.         lastInChrBuf = -1;

  449.     }

  450. 

  451.     if (!should_dither) {

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

  453.     }

  454.     lastDstY = dstY;

  455. 

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

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

  458.         uint8_t *dest[4]  = {

  459.             dst[0] + dstStride[0] * dstY,

  460.             dst[1] + dstStride[1] * chrDstY,

  461.             dst[2] + dstStride[2] * chrDstY,

  462.             (CONFIG_SWSCALE_ALPHA && alpPixBuf) ? dst[3] + dstStride[3] * dstY : NULL,

  463.         };

  464.         int use_mmx_vfilter= c->use_mmx_vfilter;

  465. 

  466.         // First line needed as input

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

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

  469.         // First line needed as input

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

  471. 

  472.         // Last line needed as input

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

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

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

  476.         int enough_lines;

  477. 

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

  479.         if (firstLumSrcY > lastInLumBuf)

  480.             lastInLumBuf = firstLumSrcY - 1;

  481.         if (firstChrSrcY > lastInChrBuf)

  482.             lastInChrBuf = firstChrSrcY - 1;

  483.         av_assert0(firstLumSrcY >= lastInLumBuf - vLumBufSize + 1);

  484.         av_assert0(firstChrSrcY >= lastInChrBuf - vChrBufSize + 1);

  485. 

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

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

  488.                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

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

  490.                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

  491. 

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

  493.         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

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

  495. 

  496.         if (!enough_lines) {

  497.             lastLumSrcY = srcSliceY + srcSliceH - 1;

  498.             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;

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

  500.                           lastLumSrcY, lastChrSrcY);

  501.         }

  502. 

  503.         // Do horizontal scaling

  504.         while (lastInLumBuf < lastLumSrcY) {

  505.             const uint8_t *src1[4] = {

  506.                 src[0] + (lastInLumBuf + 1 - srcSliceY) * srcStride[0],

  507.                 src[1] + (lastInLumBuf + 1 - srcSliceY) * srcStride[1],

  508.                 src[2] + (lastInLumBuf + 1 - srcSliceY) * srcStride[2],

  509.                 src[3] + (lastInLumBuf + 1 - srcSliceY) * srcStride[3],

  510.             };

  511.             lumBufIndex++;

  512.             av_assert0(lumBufIndex < 2 * vLumBufSize);

  513.             av_assert0(lastInLumBuf + 1 - srcSliceY < srcSliceH);

  514.             av_assert0(lastInLumBuf + 1 - srcSliceY >= 0);

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

  516.                     hLumFilter, hLumFilterPos, hLumFilterSize,

  517.                     formatConvBuffer, pal, 0);

  518.             if (CONFIG_SWSCALE_ALPHA && alpPixBuf)

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

  520.                         lumXInc, hLumFilter, hLumFilterPos, hLumFilterSize,

  521.                         formatConvBuffer, pal, 1);

  522.             lastInLumBuf++;

  523.             DEBUG_BUFFERS("\t\tlumBufIndex %d: lastInLumBuf: %d\n",

  524.                           lumBufIndex, lastInLumBuf);

  525.         }

  526.         while (lastInChrBuf < lastChrSrcY) {

  527.             const uint8_t *src1[4] = {

  528.                 src[0] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[0],

  529.                 src[1] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[1],

  530.                 src[2] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[2],

  531.                 src[3] + (lastInChrBuf + 1 - chrSrcSliceY) * srcStride[3],

  532.             };

  533.             chrBufIndex++;

  534.             av_assert0(chrBufIndex < 2 * vChrBufSize);

  535.             av_assert0(lastInChrBuf + 1 - chrSrcSliceY < (chrSrcSliceH));

  536.             av_assert0(lastInChrBuf + 1 - chrSrcSliceY >= 0);

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

  538. 

  539.             if (c->needs_hcscale)

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

  541.                         chrDstW, src1, chrSrcW, chrXInc,

  542.                         hChrFilter, hChrFilterPos, hChrFilterSize,

  543.                         formatConvBuffer, pal);

  544.             lastInChrBuf++;

  545.             DEBUG_BUFFERS("\t\tchrBufIndex %d: lastInChrBuf: %d\n",

  546.                           chrBufIndex, lastInChrBuf);

  547.         }

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

  549.         if (lumBufIndex >= vLumBufSize)

  550.             lumBufIndex -= vLumBufSize;

  551.         if (chrBufIndex >= vChrBufSize)

  552.             chrBufIndex -= vChrBufSize;

  553.         if (!enough_lines)

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

  555. 

  556. #if HAVE_MMX_INLINE

  557.         updateMMXDitherTables(c, dstY, lumBufIndex, chrBufIndex,

  558.                               lastInLumBuf, lastInChrBuf);

  559. #endif

  560.         if (should_dither) {

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

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

  563.         }

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

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

  566.              * this array's tail */

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

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

  569.             use_mmx_vfilter= 0;

  570.         }

  571. 

  572.         {

  573.             const int16_t **lumSrcPtr  = (const int16_t **)(void*) lumPixBuf  + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize;

  574.             const int16_t **chrUSrcPtr = (const int16_t **)(void*) chrUPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;

  575.             const int16_t **chrVSrcPtr = (const int16_t **)(void*) chrVPixBuf + chrBufIndex + firstChrSrcY - lastInChrBuf + vChrBufSize;

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

  577.                                          (const int16_t **)(void*) alpPixBuf + lumBufIndex + firstLumSrcY - lastInLumBuf + vLumBufSize : NULL;

  578.             int16_t *vLumFilter = c->vLumFilter;

  579.             int16_t *vChrFilter = c->vChrFilter;

  580. 

  581.             if (isPlanarYUV(dstFormat) ||

  582.                 (isGray(dstFormat) && !isALPHA(dstFormat))) { // YV12 like

  583.                 const int chrSkipMask = (1 << c->chrDstVSubSample) - 1;

  584. 

  585.                 vLumFilter +=    dstY * vLumFilterSize;

  586.                 vChrFilter += chrDstY * vChrFilterSize;

  587. 

  588. //                 av_assert0(use_mmx_vfilter != (

  589. //                                yuv2planeX == yuv2planeX_10BE_c

  590. //                             || yuv2planeX == yuv2planeX_10LE_c

  591. //                             || yuv2planeX == yuv2planeX_9BE_c

  592. //                             || yuv2planeX == yuv2planeX_9LE_c

  593. //                             || yuv2planeX == yuv2planeX_16BE_c

  594. //                             || yuv2planeX == yuv2planeX_16LE_c

  595. //                             || yuv2planeX == yuv2planeX_8_c) || !ARCH_X86);

  596. 

  597.                 if(use_mmx_vfilter){

  598.                     vLumFilter= (int16_t *)c->lumMmxFilter;

  599.                     vChrFilter= (int16_t *)c->chrMmxFilter;

  600.                 }

  601. 

  602.                 if (vLumFilterSize == 1) {

  603.                     yuv2plane1(lumSrcPtr[0], dest[0], dstW, c->lumDither8, 0);

  604.                 } else {

  605.                     yuv2planeX(vLumFilter, vLumFilterSize,

  606.                                lumSrcPtr, dest[0],

  607.                                dstW, c->lumDither8, 0);

  608.                 }

  609. 

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

  611.                     if (yuv2nv12cX) {

  612.                         yuv2nv12cX(c, vChrFilter,

  613.                                    vChrFilterSize, chrUSrcPtr, chrVSrcPtr,

  614.                                    dest[1], chrDstW);

  615.                     } else if (vChrFilterSize == 1) {

  616.                         yuv2plane1(chrUSrcPtr[0], dest[1], chrDstW, c->chrDither8, 0);

  617.                         yuv2plane1(chrVSrcPtr[0], dest[2], chrDstW, c->chrDither8, 3);

  618.                     } else {

  619.                         yuv2planeX(vChrFilter,

  620.                                    vChrFilterSize, chrUSrcPtr, dest[1],

  621.                                    chrDstW, c->chrDither8, 0);

  622.                         yuv2planeX(vChrFilter,

  623.                                    vChrFilterSize, chrVSrcPtr, dest[2],

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

  625.                     }

  626.                 }

  627. 

  628.                 if (CONFIG_SWSCALE_ALPHA && alpPixBuf) {

  629.                     if(use_mmx_vfilter){

  630.                         vLumFilter= (int16_t *)c->alpMmxFilter;

  631.                     }

  632.                     if (vLumFilterSize == 1) {

  633.                         yuv2plane1(alpSrcPtr[0], dest[3], dstW,

  634.                                    c->lumDither8, 0);

  635.                     } else {

  636.                         yuv2planeX(vLumFilter,

  637.                                    vLumFilterSize, alpSrcPtr, dest[3],

  638.                                    dstW, c->lumDither8, 0);

  639.                     }

  640.                 }

  641.             } else if (yuv2packedX) {

  642.                 av_assert1(lumSrcPtr  + vLumFilterSize - 1 < (const int16_t **)lumPixBuf  + vLumBufSize * 2);

  643.                 av_assert1(chrUSrcPtr + vChrFilterSize - 1 < (const int16_t **)chrUPixBuf + vChrBufSize * 2);

  644.                 if (c->yuv2packed1 && vLumFilterSize == 1 &&

  645.                     vChrFilterSize <= 2) { // unscaled RGB

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

  647.                     yuv2packed1(c, *lumSrcPtr, chrUSrcPtr, chrVSrcPtr,

  648.                                 alpPixBuf ? *alpSrcPtr : NULL,

  649.                                 dest[0], dstW, chrAlpha, dstY);

  650.                 } else if (c->yuv2packed2 && vLumFilterSize == 2 &&

  651.                            vChrFilterSize == 2) { // bilinear upscale RGB

  652.                     int lumAlpha = vLumFilter[2 * dstY + 1];

  653.                     int chrAlpha = vChrFilter[2 * dstY + 1];

  654.                     lumMmxFilter[2] =

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

  656.                     chrMmxFilter[2] =

  657.                     chrMmxFilter[3] = vChrFilter[2 * chrDstY] * 0x10001;

  658.                     yuv2packed2(c, lumSrcPtr, chrUSrcPtr, chrVSrcPtr,

  659.                                 alpPixBuf ? alpSrcPtr : NULL,

  660.                                 dest[0], dstW, lumAlpha, chrAlpha, dstY);

  661.                 } else { // general RGB

  662.                     yuv2packedX(c, vLumFilter + dstY * vLumFilterSize,

  663.                                 lumSrcPtr, vLumFilterSize,

  664.                                 vChrFilter + dstY * vChrFilterSize,

  665.                                 chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

  666.                                 alpSrcPtr, dest[0], dstW, dstY);

  667.                 }

  668.             } else {

  669.                 av_assert1(!yuv2packed1 && !yuv2packed2);

  670.                 yuv2anyX(c, vLumFilter + dstY * vLumFilterSize,

  671.                          lumSrcPtr, vLumFilterSize,

  672.                          vChrFilter + dstY * vChrFilterSize,

  673.                          chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

  674.                          alpSrcPtr, dest, dstW, dstY);

  675.             }

  676.         }

  677.     }

  678.     if (isPlanar(dstFormat) && isALPHA(dstFormat) && !alpPixBuf) {

  679.         int length = dstW;

  680.         int height = dstY - lastDstY;

  681. 

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

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

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

  685.                     1, desc->comp[3].depth_minus1,

  686.                     isBE(dstFormat));

  687.         } else

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

  689.     }

  690. 

  691. #if HAVE_MMXEXT_INLINE

  692.     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

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

  694. #endif

  695.     emms_c();

  696. 

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

  698.     c->dstY         = dstY;

  699.     c->lumBufIndex  = lumBufIndex;

  700.     c->chrBufIndex  = chrBufIndex;

  701.     c->lastInLumBuf = lastInLumBuf;

  702.     c->lastInChrBuf = lastInChrBuf;

  703. 

  704.     return dstY - lastDstY;

  705. }

  706. 

  707. static av_cold void sws_init_swscale(SwsContext *c)

  708. {

  709.     enum AVPixelFormat srcFormat = c->srcFormat;

  710. 

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

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

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

  714. 

  715.     ff_sws_init_input_funcs(c);

  716. 

  717. 

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

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

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

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

  722.                 c->hyscale_fast = hyscale_fast_c;

  723.                 c->hcscale_fast = hcscale_fast_c;

  724.             }

  725.         } else {

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

  727.         }

  728.     } else {

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

  730.                                                  : hScale16To15_c;

  731.     }

  732. 

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

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

  735.             if (c->srcRange) {

  736.                 c->lumConvertRange = lumRangeFromJpeg_c;

  737.                 c->chrConvertRange = chrRangeFromJpeg_c;

  738.             } else {

  739.                 c->lumConvertRange = lumRangeToJpeg_c;

  740.                 c->chrConvertRange = chrRangeToJpeg_c;

  741.             }

  742.         } else {

  743.             if (c->srcRange) {

  744.                 c->lumConvertRange = lumRangeFromJpeg16_c;

  745.                 c->chrConvertRange = chrRangeFromJpeg16_c;

  746.             } else {

  747.                 c->lumConvertRange = lumRangeToJpeg16_c;

  748.                 c->chrConvertRange = chrRangeToJpeg16_c;

  749.             }

  750.         }

  751.     }

  752. 

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

  754.           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

  755.         c->needs_hcscale = 1;

  756. }

  757. 

  758. SwsFunc ff_getSwsFunc(SwsContext *c)

  759. {

  760.     sws_init_swscale(c);

  761. 

  762.     if (ARCH_PPC)

  763.         ff_sws_init_swscale_ppc(c);

  764.     if (ARCH_X86)

  765.         ff_sws_init_swscale_x86(c);

  766. 

  767.     return swscale;

  768. }

  769. 

  770. static void reset_ptr(const uint8_t *src[], int format)

  771. {

  772.     if (!isALPHA(format))

  773.         src[3] = NULL;

  774.     if (!isPlanar(format)) {

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

  776. 

  777.         if (!usePal(format))

  778.             src[1] = NULL;

  779.     }

  780. }

  781. 

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

  783.                                 const int linesizes[4])

  784. {

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

  786.     int i;

  787. 

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

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

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

  791.             return 0;

  792.     }

  793. 

  794.     return 1;

  795. }

  796. 

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

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

  799. {

  800.     int xp,yp;

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

  802. 

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

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

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

  806. 

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

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

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

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

  811.             } else {

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

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

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

  815.             }

  816. 

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

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

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

  820. 

  821.             // convert from XYZlinear to sRGBlinear

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

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

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

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

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

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

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

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

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

  831. 

  832.             // limit values to 12-bit depth

  833.             r = av_clip_c(r,0,4095);

  834.             g = av_clip_c(g,0,4095);

  835.             b = av_clip_c(b,0,4095);

  836. 

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

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

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

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

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

  842.             } else {

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

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

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

  846.             }

  847.         }

  848.         src += stride;

  849.         dst += stride;

  850.     }

  851. }

  852. 

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

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

  855. {

  856.     int xp,yp;

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

  858. 

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

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

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

  862. 

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

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

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

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

  867.             } else {

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

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

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

  871.             }

  872. 

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

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

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

  876. 

  877.             // convert from sRGBlinear to XYZlinear

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

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

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

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

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

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

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

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

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

  887. 

  888.             // limit values to 12-bit depth

  889.             x = av_clip_c(x,0,4095);

  890.             y = av_clip_c(y,0,4095);

  891.             z = av_clip_c(z,0,4095);

  892. 

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

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

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

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

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

  898.             } else {

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

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

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

  902.             }

  903.         }

  904.         src += stride;

  905.         dst += stride;

  906.     }

  907. }

  908. 

  909. /**

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

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

  912.  */

  913. int attribute_align_arg sws_scale(struct SwsContext *c,

  914.                                   const uint8_t * const srcSlice[],

  915.                                   const int srcStride[], int srcSliceY,

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

  917.                                   const int dstStride[])

  918. {

  919.     int i, ret;

  920.     const uint8_t *src2[4];

  921.     uint8_t *dst2[4];

  922.     uint8_t *rgb0_tmp = NULL;

  923. 

  924.     if (!srcSlice || !dstStride || !dst || !srcSlice) {

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

  926.         return 0;

  927.     }

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

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

  930. 

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

  932.     if (srcSliceH == 0)

  933.         return 0;

  934. 

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

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

  937.         return 0;

  938.     }

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

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

  941.         return 0;

  942.     }

  943. 

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

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

  946.         return 0;

  947.     }

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

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

  950.     }

  951. 

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

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

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

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

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

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

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

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

  960.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  974.                 r = g = b = i;

  975.             } else {

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

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

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

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

  980.             }

  981. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  991. 

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

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

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

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

  996. 

  997.             switch (c->dstFormat) {

  998.             case AV_PIX_FMT_BGR32:

  999. #if !HAVE_BIGENDIAN

  1000.             case AV_PIX_FMT_RGB24:

  1001. #endif

  1002.                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + ((unsigned)a<<24);

  1003.                 break;

  1004.             case AV_PIX_FMT_BGR32_1:

  1005. #if HAVE_BIGENDIAN

  1006.             case AV_PIX_FMT_BGR24:

  1007. #endif

  1008.                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + ((unsigned)b<<24);

  1009.                 break;

  1010.             case AV_PIX_FMT_RGB32_1:

  1011. #if HAVE_BIGENDIAN

  1012.             case AV_PIX_FMT_RGB24:

  1013. #endif

  1014.                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + ((unsigned)r<<24);

  1015.                 break;

  1016.             case AV_PIX_FMT_RGB32:

  1017. #if !HAVE_BIGENDIAN

  1018.             case AV_PIX_FMT_BGR24:

  1019. #endif

  1020.             default:

  1021.                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + ((unsigned)a<<24);

  1022.             }

  1023.         }

  1024.     }

  1025. 

  1026.     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {

  1027.         uint8_t *base;

  1028.         int x,y;

  1029.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  1030.         if (!rgb0_tmp)

  1031.             return AVERROR(ENOMEM);

  1032. 

  1033.         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;

  1034.         for (y=0; y<srcSliceH; y++){

  1035.             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);

  1036.             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {

  1037.                 base[ srcStride[0]*y + x] = 0xFF;

  1038.             }

  1039.         }

  1040.         src2[0] = base;

  1041.     }

  1042. 

  1043.     if (c->srcXYZ && !(c->dstXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  1044.         uint8_t *base;

  1045.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  1046.         if (!rgb0_tmp)

  1047.             return AVERROR(ENOMEM);

  1048. 

  1049.         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;

  1050. 

  1051.         xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2, srcSliceH);

  1052.         src2[0] = base;

  1053.     }

  1054. 

  1055.     if (!srcSliceY && (c->flags & SWS_BITEXACT) && c->dither == SWS_DITHER_ED && c->dither_error[0])

  1056.         for (i = 0; i < 4; i++)

  1057.             memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));

  1058. 

  1059. 

  1060.     // copy strides, so they can safely be modified

  1061.     if (c->sliceDir == 1) {

  1062.         // slices go from top to bottom

  1063.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  1064.                               srcStride[3] };

  1065.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  1066.                               dstStride[3] };

  1067. 

  1068.         reset_ptr(src2, c->srcFormat);

  1069.         reset_ptr((void*)dst2, c->dstFormat);

  1070. 

  1071.         /* reset slice direction at end of frame */

  1072.         if (srcSliceY + srcSliceH == c->srcH)

  1073.             c->sliceDir = 0;

  1074. 

  1075.         ret = c->swscale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1076.                           dstStride2);

  1077.     } else {

  1078.         // slices go from bottom to top => we flip the image internally

  1079.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1080.                               -srcStride[3] };

  1081.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1082.                               -dstStride[3] };

  1083. 

  1084.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1085.         if (!usePal(c->srcFormat))

  1086.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1087.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1088.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1089.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1090.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1091.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1092.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1093. 

  1094.         reset_ptr(src2, c->srcFormat);

  1095.         reset_ptr((void*)dst2, c->dstFormat);

  1096. 

  1097.         /* reset slice direction at end of frame */

  1098.         if (!srcSliceY)

  1099.             c->sliceDir = 0;

  1100. 

  1101.         ret = c->swscale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1102.                           srcSliceH, dst2, dstStride2);

  1103.     }

  1104. 

  1105. 

  1106.     if (c->dstXYZ && !(c->srcXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  1107.         /* replace on the same data */

  1108.         rgb48Toxyz12(c, (uint16_t*)dst2[0], (const uint16_t*)dst2[0], dstStride[0]/2, ret);

  1109.     }

  1110. 

  1111.     av_free(rgb0_tmp);

  1112.     return ret;

  1113. }