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

  213.     }

  214. }

  215. 

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

  217. {

  218.     int i;

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

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

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

  222. }

  223. 

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

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

  226. {

  227.     int i;

  228.     unsigned int xpos = 0;

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

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

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

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

  233.         xpos  += xInc;

  234.     }

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

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

  237. }

  238. 

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

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

  241.                                      const uint8_t *src_in[4],

  242.                                      int srcW, int xInc,

  243.                                      const int16_t *hLumFilter,

  244.                                      const int32_t *hLumFilterPos,

  245.                                      int hLumFilterSize,

  246.                                      uint8_t *formatConvBuffer,

  247.                                      uint32_t *pal, int isAlpha)

  248. {

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

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

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

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

  253. 

  254.     if (toYV12) {

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

  256.         src = formatConvBuffer;

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

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

  259.         src = formatConvBuffer;

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

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

  262.         src = formatConvBuffer;

  263.     }

  264. 

  265.     if (!c->hyscale_fast) {

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

  267.                    hLumFilterPos, hLumFilterSize);

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

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

  270.     }

  271. 

  272.     if (convertRange)

  273.         convertRange(dst, dstWidth);

  274. }

  275. 

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

  277.                            int dstWidth, const uint8_t *src1,

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

  279. {

  280.     int i;

  281.     unsigned int xpos = 0;

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

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

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

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

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

  287.         xpos   += xInc;

  288.     }

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

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

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

  292.     }

  293. }

  294. 

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

  296.                                      int16_t *dst2, int dstWidth,

  297.                                      const uint8_t *src_in[4],

  298.                                      int srcW, int xInc,

  299.                                      const int16_t *hChrFilter,

  300.                                      const int32_t *hChrFilterPos,

  301.                                      int hChrFilterSize,

  302.                                      uint8_t *formatConvBuffer, uint32_t *pal)

  303. {

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

  305.     if (c->chrToYV12) {

  306.         uint8_t *buf2 = formatConvBuffer +

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

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

  309.         src1= formatConvBuffer;

  310.         src2= buf2;

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

  312.         uint8_t *buf2 = formatConvBuffer +

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

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

  315.         src1 = formatConvBuffer;

  316.         src2 = buf2;

  317.     }

  318. 

  319.     if (!c->hcscale_fast) {

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

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

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

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

  324.     }

  325. 

  326.     if (c->chrConvertRange)

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

  328. }

  329. 

  330. #define DEBUG_SWSCALE_BUFFERS 0

  331. #define DEBUG_BUFFERS(...)                      \

  332.     if (DEBUG_SWSCALE_BUFFERS)                  \

  333.         av_log(c, AV_LOG_DEBUG, __VA_ARGS__)

  334. 

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

  336.                    int srcStride[], int srcSliceY,

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

  338. {

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

  340.      * and faster */

  341.     const int srcW                   = c->srcW;

  342.     const int dstW                   = c->dstW;

  343.     const int dstH                   = c->dstH;

  344.     const int chrDstW                = c->chrDstW;

  345.     const int chrSrcW                = c->chrSrcW;

  346.     const int lumXInc                = c->lumXInc;

  347.     const int chrXInc                = c->chrXInc;

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

  349.     const int flags                  = c->flags;

  350.     int32_t *vLumFilterPos           = c->vLumFilterPos;

  351.     int32_t *vChrFilterPos           = c->vChrFilterPos;

  352.     int32_t *hLumFilterPos           = c->hLumFilterPos;

  353.     int32_t *hChrFilterPos           = c->hChrFilterPos;

  354.     int16_t *hLumFilter              = c->hLumFilter;

  355.     int16_t *hChrFilter              = c->hChrFilter;

  356.     int32_t *lumMmxFilter            = c->lumMmxFilter;

  357.     int32_t *chrMmxFilter            = c->chrMmxFilter;

  358.     const int vLumFilterSize         = c->vLumFilterSize;

  359.     const int vChrFilterSize         = c->vChrFilterSize;

  360.     const int hLumFilterSize         = c->hLumFilterSize;

  361.     const int hChrFilterSize         = c->hChrFilterSize;

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

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

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

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

  366.     const int vLumBufSize            = c->vLumBufSize;

  367.     const int vChrBufSize            = c->vChrBufSize;

  368.     uint8_t *formatConvBuffer        = c->formatConvBuffer;

  369.     uint32_t *pal                    = c->pal_yuv;

  370.     yuv2planar1_fn yuv2plane1        = c->yuv2plane1;

  371.     yuv2planarX_fn yuv2planeX        = c->yuv2planeX;

  372.     yuv2interleavedX_fn yuv2nv12cX   = c->yuv2nv12cX;

  373.     yuv2packed1_fn yuv2packed1       = c->yuv2packed1;

  374.     yuv2packed2_fn yuv2packed2       = c->yuv2packed2;

  375.     yuv2packedX_fn yuv2packedX       = c->yuv2packedX;

  376.     yuv2anyX_fn yuv2anyX             = c->yuv2anyX;

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

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

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

  380.                                        is16BPS(c->srcFormat);

  381.     int lastDstY;

  382. 

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

  384.     int dstY         = c->dstY;

  385.     int lumBufIndex  = c->lumBufIndex;

  386.     int chrBufIndex  = c->chrBufIndex;

  387.     int lastInLumBuf = c->lastInLumBuf;

  388.     int lastInChrBuf = c->lastInChrBuf;

  389. 

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

  391.         pal = c->input_rgb2yuv_table;

  392.     }

  393. 

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

  395.         src[0] =

  396.         src[1] =

  397.         src[2] =

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

  399.         srcStride[0] =

  400.         srcStride[1] =

  401.         srcStride[2] =

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

  403.     }

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

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

  406. 

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

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

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

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

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

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

  413.                   srcSliceY, srcSliceH, dstY, dstH);

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

  415.                   vLumFilterSize, vLumBufSize, vChrFilterSize, vChrBufSize);

  416. 

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

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

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

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

  421.             av_log(c, AV_LOG_WARNING,

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

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

  424.             warnedAlready = 1;

  425.         }

  426.     }

  427. 

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

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

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

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

  432.     ) {

  433.         static int warnedAlready=0;

  434.         int cpu_flags = av_get_cpu_flags();

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

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

  437.             warnedAlready=1;

  438.         }

  439.     }

  440. 

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

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

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

  444.     if (srcSliceY == 0) {

  445.         lumBufIndex  = -1;

  446.         chrBufIndex  = -1;

  447.         dstY         = 0;

  448.         lastInLumBuf = -1;

  449.         lastInChrBuf = -1;

  450.     }

  451. 

  452.     if (!should_dither) {

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

  454.     }

  455.     lastDstY = dstY;

  456. 

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

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

  459.         uint8_t *dest[4]  = {

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

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

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

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

  464.         };

  465.         int use_mmx_vfilter= c->use_mmx_vfilter;

  466. 

  467.         // First line needed as input

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

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

  470.         // First line needed as input

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

  472. 

  473.         // Last line needed as input

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

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

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

  477.         int enough_lines;

  478. 

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

  480.         if (firstLumSrcY > lastInLumBuf)

  481.             lastInLumBuf = firstLumSrcY - 1;

  482.         if (firstChrSrcY > lastInChrBuf)

  483.             lastInChrBuf = firstChrSrcY - 1;

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

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

  486. 

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

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

  489.                       firstLumSrcY, lastLumSrcY, lastInLumBuf);

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

  491.                       firstChrSrcY, lastChrSrcY, lastInChrBuf);

  492. 

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

  494.         enough_lines = lastLumSrcY2 < srcSliceY + srcSliceH &&

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

  496. 

  497.         if (!enough_lines) {

  498.             lastLumSrcY = srcSliceY + srcSliceH - 1;

  499.             lastChrSrcY = chrSrcSliceY + chrSrcSliceH - 1;

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

  501.                           lastLumSrcY, lastChrSrcY);

  502.         }

  503. 

  504.         // Do horizontal scaling

  505.         while (lastInLumBuf < lastLumSrcY) {

  506.             const uint8_t *src1[4] = {

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

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

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

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

  511.             };

  512.             lumBufIndex++;

  513.             av_assert0(lumBufIndex < 2 * vLumBufSize);

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

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

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

  517.                     hLumFilter, hLumFilterPos, hLumFilterSize,

  518.                     formatConvBuffer, pal, 0);

  519.             if (CONFIG_SWSCALE_ALPHA && alpPixBuf)

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

  521.                         lumXInc, hLumFilter, hLumFilterPos, hLumFilterSize,

  522.                         formatConvBuffer, pal, 1);

  523.             lastInLumBuf++;

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

  525.                           lumBufIndex, lastInLumBuf);

  526.         }

  527.         while (lastInChrBuf < lastChrSrcY) {

  528.             const uint8_t *src1[4] = {

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

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

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

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

  533.             };

  534.             chrBufIndex++;

  535.             av_assert0(chrBufIndex < 2 * vChrBufSize);

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

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

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

  539. 

  540.             if (c->needs_hcscale)

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

  542.                         chrDstW, src1, chrSrcW, chrXInc,

  543.                         hChrFilter, hChrFilterPos, hChrFilterSize,

  544.                         formatConvBuffer, pal);

  545.             lastInChrBuf++;

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

  547.                           chrBufIndex, lastInChrBuf);

  548.         }

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

  550.         if (lumBufIndex >= vLumBufSize)

  551.             lumBufIndex -= vLumBufSize;

  552.         if (chrBufIndex >= vChrBufSize)

  553.             chrBufIndex -= vChrBufSize;

  554.         if (!enough_lines)

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

  556. 

  557. #if HAVE_MMX_INLINE

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

  559.                               lastInLumBuf, lastInChrBuf);

  560. #endif

  561.         if (should_dither) {

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

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

  564.         }

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

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

  567.              * this array's tail */

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

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

  570.             use_mmx_vfilter= 0;

  571.         }

  572. 

  573.         {

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

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

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

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

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

  579.             int16_t *vLumFilter = c->vLumFilter;

  580.             int16_t *vChrFilter = c->vChrFilter;

  581. 

  582.             if (isPlanarYUV(dstFormat) ||

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

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

  585. 

  586.                 vLumFilter +=    dstY * vLumFilterSize;

  587.                 vChrFilter += chrDstY * vChrFilterSize;

  588. 

  589. //                 av_assert0(use_mmx_vfilter != (

  590. //                                yuv2planeX == yuv2planeX_10BE_c

  591. //                             || yuv2planeX == yuv2planeX_10LE_c

  592. //                             || yuv2planeX == yuv2planeX_9BE_c

  593. //                             || yuv2planeX == yuv2planeX_9LE_c

  594. //                             || yuv2planeX == yuv2planeX_16BE_c

  595. //                             || yuv2planeX == yuv2planeX_16LE_c

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

  597. 

  598.                 if(use_mmx_vfilter){

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

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

  601.                 }

  602. 

  603.                 if (vLumFilterSize == 1) {

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

  605.                 } else {

  606.                     yuv2planeX(vLumFilter, vLumFilterSize,

  607.                                lumSrcPtr, dest[0],

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

  609.                 }

  610. 

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

  612.                     if (yuv2nv12cX) {

  613.                         yuv2nv12cX(c, vChrFilter,

  614.                                    vChrFilterSize, chrUSrcPtr, chrVSrcPtr,

  615.                                    dest[1], chrDstW);

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

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

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

  619.                     } else {

  620.                         yuv2planeX(vChrFilter,

  621.                                    vChrFilterSize, chrUSrcPtr, dest[1],

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

  623.                         yuv2planeX(vChrFilter,

  624.                                    vChrFilterSize, chrVSrcPtr, dest[2],

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

  626.                     }

  627.                 }

  628. 

  629.                 if (CONFIG_SWSCALE_ALPHA && alpPixBuf) {

  630.                     if(use_mmx_vfilter){

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

  632.                     }

  633.                     if (vLumFilterSize == 1) {

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

  635.                                    c->lumDither8, 0);

  636.                     } else {

  637.                         yuv2planeX(vLumFilter,

  638.                                    vLumFilterSize, alpSrcPtr, dest[3],

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

  640.                     }

  641.                 }

  642.             } else if (yuv2packedX) {

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

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

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

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

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

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

  649.                                 alpPixBuf ? *alpSrcPtr : NULL,

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

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

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

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

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

  655.                     lumMmxFilter[2] =

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

  657.                     chrMmxFilter[2] =

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

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

  660.                                 alpPixBuf ? alpSrcPtr : NULL,

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

  662.                 } else { // general RGB

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

  664.                                 lumSrcPtr, vLumFilterSize,

  665.                                 vChrFilter + dstY * vChrFilterSize,

  666.                                 chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

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

  668.                 }

  669.             } else {

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

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

  672.                          lumSrcPtr, vLumFilterSize,

  673.                          vChrFilter + dstY * vChrFilterSize,

  674.                          chrUSrcPtr, chrVSrcPtr, vChrFilterSize,

  675.                          alpSrcPtr, dest, dstW, dstY);

  676.             }

  677.         }

  678.     }

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

  680.         int length = dstW;

  681.         int height = dstY - lastDstY;

  682. 

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

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

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

  686.                     1, desc->comp[3].depth_minus1,

  687.                     isBE(dstFormat));

  688.         } else

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

  690.     }

  691. 

  692. #if HAVE_MMXEXT_INLINE

  693.     if (av_get_cpu_flags() & AV_CPU_FLAG_MMXEXT)

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

  695. #endif

  696.     emms_c();

  697. 

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

  699.     c->dstY         = dstY;

  700.     c->lumBufIndex  = lumBufIndex;

  701.     c->chrBufIndex  = chrBufIndex;

  702.     c->lastInLumBuf = lastInLumBuf;

  703.     c->lastInChrBuf = lastInChrBuf;

  704. 

  705.     return dstY - lastDstY;

  706. }

  707. 

  708. av_cold void ff_sws_init_range_convert(SwsContext *c)

  709. {

  710.     c->lumConvertRange = NULL;

  711.     c->chrConvertRange = NULL;

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

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

  714.             if (c->srcRange) {

  715.                 c->lumConvertRange = lumRangeFromJpeg_c;

  716.                 c->chrConvertRange = chrRangeFromJpeg_c;

  717.             } else {

  718.                 c->lumConvertRange = lumRangeToJpeg_c;

  719.                 c->chrConvertRange = chrRangeToJpeg_c;

  720.             }

  721.         } else {

  722.             if (c->srcRange) {

  723.                 c->lumConvertRange = lumRangeFromJpeg16_c;

  724.                 c->chrConvertRange = chrRangeFromJpeg16_c;

  725.             } else {

  726.                 c->lumConvertRange = lumRangeToJpeg16_c;

  727.                 c->chrConvertRange = chrRangeToJpeg16_c;

  728.             }

  729.         }

  730.     }

  731. }

  732. 

  733. static av_cold void sws_init_swscale(SwsContext *c)

  734. {

  735.     enum AVPixelFormat srcFormat = c->srcFormat;

  736. 

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

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

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

  740. 

  741.     ff_sws_init_input_funcs(c);

  742. 

  743. 

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

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

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

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

  748.                 c->hyscale_fast = hyscale_fast_c;

  749.                 c->hcscale_fast = hcscale_fast_c;

  750.             }

  751.         } else {

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

  753.         }

  754.     } else {

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

  756.                                                  : hScale16To15_c;

  757.     }

  758. 

  759.     ff_sws_init_range_convert(c);

  760. 

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

  762.           srcFormat == AV_PIX_FMT_MONOBLACK || srcFormat == AV_PIX_FMT_MONOWHITE))

  763.         c->needs_hcscale = 1;

  764. }

  765. 

  766. SwsFunc ff_getSwsFunc(SwsContext *c)

  767. {

  768.     sws_init_swscale(c);

  769. 

  770.     if (ARCH_PPC)

  771.         ff_sws_init_swscale_ppc(c);

  772.     if (ARCH_X86)

  773.         ff_sws_init_swscale_x86(c);

  774. 

  775.     return swscale;

  776. }

  777. 

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

  779. {

  780.     if (!isALPHA(format))

  781.         src[3] = NULL;

  782.     if (!isPlanar(format)) {

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

  784. 

  785.         if (!usePal(format))

  786.             src[1] = NULL;

  787.     }

  788. }

  789. 

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

  791.                                 const int linesizes[4])

  792. {

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

  794.     int i;

  795. 

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

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

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

  799.             return 0;

  800.     }

  801. 

  802.     return 1;

  803. }

  804. 

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

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

  807. {

  808.     int xp,yp;

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

  810. 

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

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

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

  814. 

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

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

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

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

  819.             } else {

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

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

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

  823.             }

  824. 

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

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

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

  828. 

  829.             // convert from XYZlinear to sRGBlinear

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

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

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

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

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

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

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

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

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

  839. 

  840.             // limit values to 12-bit depth

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

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

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

  844. 

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

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

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

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

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

  850.             } else {

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

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

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

  854.             }

  855.         }

  856.         src += stride;

  857.         dst += stride;

  858.     }

  859. }

  860. 

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

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

  863. {

  864.     int xp,yp;

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

  866. 

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

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

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

  870. 

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

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

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

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

  875.             } else {

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

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

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

  879.             }

  880. 

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

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

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

  884. 

  885.             // convert from sRGBlinear to XYZlinear

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

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

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

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

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

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

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

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

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

  895. 

  896.             // limit values to 12-bit depth

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

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

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

  900. 

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

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

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

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

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

  906.             } else {

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

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

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

  910.             }

  911.         }

  912.         src += stride;

  913.         dst += stride;

  914.     }

  915. }

  916. 

  917. /**

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

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

  920.  */

  921. int attribute_align_arg sws_scale(struct SwsContext *c,

  922.                                   const uint8_t * const srcSlice[],

  923.                                   const int srcStride[], int srcSliceY,

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

  925.                                   const int dstStride[])

  926. {

  927.     int i, ret;

  928.     const uint8_t *src2[4];

  929.     uint8_t *dst2[4];

  930.     uint8_t *rgb0_tmp = NULL;

  931. 

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

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

  934.         return 0;

  935.     }

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

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

  938. 

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

  940.     if (srcSliceH == 0)

  941.         return 0;

  942. 

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

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

  945.         return 0;

  946.     }

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

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

  949.         return 0;

  950.     }

  951. 

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

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

  954.         return 0;

  955.     }

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

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

  958.     }

  959. 

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

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

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

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

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

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

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

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

  968.                 b =  p        & 0xFF;

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

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

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

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

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

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

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

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

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

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

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

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

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

  982.                 r = g = b = i;

  983.             } else {

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

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

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

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

  988.             }

  989. #define RGB2YUV_SHIFT 15

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

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

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

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

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

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

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

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

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

  999. 

  1000.             y = av_clip_uint8((RY * r + GY * g + BY * b + ( 33 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1001.             u = av_clip_uint8((RU * r + GU * g + BU * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1002.             v = av_clip_uint8((RV * r + GV * g + BV * b + (257 << (RGB2YUV_SHIFT - 1))) >> RGB2YUV_SHIFT);

  1003.             c->pal_yuv[i]= y + (u<<8) + (v<<16) + ((unsigned)a<<24);

  1004. 

  1005.             switch (c->dstFormat) {

  1006.             case AV_PIX_FMT_BGR32:

  1007. #if !HAVE_BIGENDIAN

  1008.             case AV_PIX_FMT_RGB24:

  1009. #endif

  1010.                 c->pal_rgb[i]=  r + (g<<8) + (b<<16) + ((unsigned)a<<24);

  1011.                 break;

  1012.             case AV_PIX_FMT_BGR32_1:

  1013. #if HAVE_BIGENDIAN

  1014.             case AV_PIX_FMT_BGR24:

  1015. #endif

  1016.                 c->pal_rgb[i]= a + (r<<8) + (g<<16) + ((unsigned)b<<24);

  1017.                 break;

  1018.             case AV_PIX_FMT_RGB32_1:

  1019. #if HAVE_BIGENDIAN

  1020.             case AV_PIX_FMT_RGB24:

  1021. #endif

  1022.                 c->pal_rgb[i]= a + (b<<8) + (g<<16) + ((unsigned)r<<24);

  1023.                 break;

  1024.             case AV_PIX_FMT_RGB32:

  1025. #if !HAVE_BIGENDIAN

  1026.             case AV_PIX_FMT_BGR24:

  1027. #endif

  1028.             default:

  1029.                 c->pal_rgb[i]=  b + (g<<8) + (r<<16) + ((unsigned)a<<24);

  1030.             }

  1031.         }

  1032.     }

  1033. 

  1034.     if (c->src0Alpha && !c->dst0Alpha && isALPHA(c->dstFormat)) {

  1035.         uint8_t *base;

  1036.         int x,y;

  1037.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  1038.         if (!rgb0_tmp)

  1039.             return AVERROR(ENOMEM);

  1040. 

  1041.         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;

  1042.         for (y=0; y<srcSliceH; y++){

  1043.             memcpy(base + srcStride[0]*y, src2[0] + srcStride[0]*y, 4*c->srcW);

  1044.             for (x=c->src0Alpha-1; x<4*c->srcW; x+=4) {

  1045.                 base[ srcStride[0]*y + x] = 0xFF;

  1046.             }

  1047.         }

  1048.         src2[0] = base;

  1049.     }

  1050. 

  1051.     if (c->srcXYZ && !(c->dstXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  1052.         uint8_t *base;

  1053.         rgb0_tmp = av_malloc(FFABS(srcStride[0]) * srcSliceH + 32);

  1054.         if (!rgb0_tmp)

  1055.             return AVERROR(ENOMEM);

  1056. 

  1057.         base = srcStride[0] < 0 ? rgb0_tmp - srcStride[0] * (srcSliceH-1) : rgb0_tmp;

  1058. 

  1059.         xyz12Torgb48(c, (uint16_t*)base, (const uint16_t*)src2[0], srcStride[0]/2, srcSliceH);

  1060.         src2[0] = base;

  1061.     }

  1062. 

  1063.     if (!srcSliceY && (c->flags & SWS_BITEXACT) && c->dither == SWS_DITHER_ED && c->dither_error[0])

  1064.         for (i = 0; i < 4; i++)

  1065.             memset(c->dither_error[i], 0, sizeof(c->dither_error[0][0]) * (c->dstW+2));

  1066. 

  1067. 

  1068.     // copy strides, so they can safely be modified

  1069.     if (c->sliceDir == 1) {

  1070.         // slices go from top to bottom

  1071.         int srcStride2[4] = { srcStride[0], srcStride[1], srcStride[2],

  1072.                               srcStride[3] };

  1073.         int dstStride2[4] = { dstStride[0], dstStride[1], dstStride[2],

  1074.                               dstStride[3] };

  1075. 

  1076.         reset_ptr(src2, c->srcFormat);

  1077.         reset_ptr((void*)dst2, c->dstFormat);

  1078. 

  1079.         /* reset slice direction at end of frame */

  1080.         if (srcSliceY + srcSliceH == c->srcH)

  1081.             c->sliceDir = 0;

  1082. 

  1083.         ret = c->swscale(c, src2, srcStride2, srcSliceY, srcSliceH, dst2,

  1084.                           dstStride2);

  1085.     } else {

  1086.         // slices go from bottom to top => we flip the image internally

  1087.         int srcStride2[4] = { -srcStride[0], -srcStride[1], -srcStride[2],

  1088.                               -srcStride[3] };

  1089.         int dstStride2[4] = { -dstStride[0], -dstStride[1], -dstStride[2],

  1090.                               -dstStride[3] };

  1091. 

  1092.         src2[0] += (srcSliceH - 1) * srcStride[0];

  1093.         if (!usePal(c->srcFormat))

  1094.             src2[1] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[1];

  1095.         src2[2] += ((srcSliceH >> c->chrSrcVSubSample) - 1) * srcStride[2];

  1096.         src2[3] += (srcSliceH - 1) * srcStride[3];

  1097.         dst2[0] += ( c->dstH                         - 1) * dstStride[0];

  1098.         dst2[1] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[1];

  1099.         dst2[2] += ((c->dstH >> c->chrDstVSubSample) - 1) * dstStride[2];

  1100.         dst2[3] += ( c->dstH                         - 1) * dstStride[3];

  1101. 

  1102.         reset_ptr(src2, c->srcFormat);

  1103.         reset_ptr((void*)dst2, c->dstFormat);

  1104. 

  1105.         /* reset slice direction at end of frame */

  1106.         if (!srcSliceY)

  1107.             c->sliceDir = 0;

  1108. 

  1109.         ret = c->swscale(c, src2, srcStride2, c->srcH-srcSliceY-srcSliceH,

  1110.                           srcSliceH, dst2, dstStride2);

  1111.     }

  1112. 

  1113. 

  1114.     if (c->dstXYZ && !(c->srcXYZ && c->srcW==c->dstW && c->srcH==c->dstH)) {

  1115.         /* replace on the same data */

  1116.         rgb48Toxyz12(c, (uint16_t*)dst2[0], (const uint16_t*)dst2[0], dstStride[0]/2, ret);

  1117.     }

  1118. 

  1119.     av_free(rgb0_tmp);

  1120.     return ret;

  1121. }