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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 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 "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

  31. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

  49. #include "libavutil/ppc/cpu.h"

  50. #include "libavutil/x86/asm.h"

  51. #include "libavutil/x86/cpu.h"

  52. #include "rgb2rgb.h"

  53. #include "swscale.h"

  54. #include "swscale_internal.h"

  55. 

  56. static void handle_formats(SwsContext *c);

  57. 

  58. unsigned swscale_version(void)

  59. {

  60.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  61.     return LIBSWSCALE_VERSION_INT;

  62. }

  63. 

  64. const char *swscale_configuration(void)

  65. {

  66.     return FFMPEG_CONFIGURATION;

  67. }

  68. 

  69. const char *swscale_license(void)

  70. {

  71. #define LICENSE_PREFIX "libswscale license: "

  72.     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  73. }

  74. 

  75. #define RET 0xC3 // near return opcode for x86

  76. 

  77. typedef struct FormatEntry {

  78.     uint8_t is_supported_in         :1;

  79.     uint8_t is_supported_out        :1;

  80.     uint8_t is_supported_endianness :1;

  81. } FormatEntry;

  82. 

  83. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

  84.     [AV_PIX_FMT_YUV420P]     = { 1, 1 },

  85.     [AV_PIX_FMT_YUYV422]     = { 1, 1 },

  86.     [AV_PIX_FMT_RGB24]       = { 1, 1 },

  87.     [AV_PIX_FMT_BGR24]       = { 1, 1 },

  88.     [AV_PIX_FMT_YUV422P]     = { 1, 1 },

  89.     [AV_PIX_FMT_YUV444P]     = { 1, 1 },

  90.     [AV_PIX_FMT_YUV410P]     = { 1, 1 },

  91.     [AV_PIX_FMT_YUV411P]     = { 1, 1 },

  92.     [AV_PIX_FMT_GRAY8]       = { 1, 1 },

  93.     [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },

  94.     [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },

  95.     [AV_PIX_FMT_PAL8]        = { 1, 0 },

  96.     [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },

  97.     [AV_PIX_FMT_YUVJ411P]    = { 1, 1 },

  98.     [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },

  99.     [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },

  100.     [AV_PIX_FMT_UYVY422]     = { 1, 1 },

  101.     [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },

  102.     [AV_PIX_FMT_BGR8]        = { 1, 1 },

  103.     [AV_PIX_FMT_BGR4]        = { 0, 1 },

  104.     [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },

  105.     [AV_PIX_FMT_RGB8]        = { 1, 1 },

  106.     [AV_PIX_FMT_RGB4]        = { 0, 1 },

  107.     [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },

  108.     [AV_PIX_FMT_NV12]        = { 1, 1 },

  109.     [AV_PIX_FMT_NV21]        = { 1, 1 },

  110.     [AV_PIX_FMT_ARGB]        = { 1, 1 },

  111.     [AV_PIX_FMT_RGBA]        = { 1, 1 },

  112.     [AV_PIX_FMT_ABGR]        = { 1, 1 },

  113.     [AV_PIX_FMT_BGRA]        = { 1, 1 },

  114.     [AV_PIX_FMT_0RGB]        = { 1, 1 },

  115.     [AV_PIX_FMT_RGB0]        = { 1, 1 },

  116.     [AV_PIX_FMT_0BGR]        = { 1, 1 },

  117.     [AV_PIX_FMT_BGR0]        = { 1, 1 },

  118.     [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },

  119.     [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },

  120.     [AV_PIX_FMT_YUV440P]     = { 1, 1 },

  121.     [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },

  122.     [AV_PIX_FMT_YUVA420P]    = { 1, 1 },

  123.     [AV_PIX_FMT_YUVA422P]    = { 1, 1 },

  124.     [AV_PIX_FMT_YUVA444P]    = { 1, 1 },

  125.     [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },

  126.     [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },

  127.     [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },

  128.     [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },

  129.     [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },

  130.     [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },

  131.     [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },

  132.     [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },

  133.     [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },

  134.     [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },

  135.     [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },

  136.     [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },

  137.     [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },

  138.     [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },

  139.     [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },

  140.     [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },

  141.     [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },

  142.     [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },

  143.     [AV_PIX_FMT_RGB48BE]     = { 1, 1 },

  144.     [AV_PIX_FMT_RGB48LE]     = { 1, 1 },

  145.     [AV_PIX_FMT_RGBA64BE]    = { 1, 1 },

  146.     [AV_PIX_FMT_RGBA64LE]    = { 1, 1 },

  147.     [AV_PIX_FMT_RGB565BE]    = { 1, 1 },

  148.     [AV_PIX_FMT_RGB565LE]    = { 1, 1 },

  149.     [AV_PIX_FMT_RGB555BE]    = { 1, 1 },

  150.     [AV_PIX_FMT_RGB555LE]    = { 1, 1 },

  151.     [AV_PIX_FMT_BGR565BE]    = { 1, 1 },

  152.     [AV_PIX_FMT_BGR565LE]    = { 1, 1 },

  153.     [AV_PIX_FMT_BGR555BE]    = { 1, 1 },

  154.     [AV_PIX_FMT_BGR555LE]    = { 1, 1 },

  155.     [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },

  156.     [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },

  157.     [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },

  158.     [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },

  159.     [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },

  160.     [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },

  161.     [AV_PIX_FMT_RGB444LE]    = { 1, 1 },

  162.     [AV_PIX_FMT_RGB444BE]    = { 1, 1 },

  163.     [AV_PIX_FMT_BGR444LE]    = { 1, 1 },

  164.     [AV_PIX_FMT_BGR444BE]    = { 1, 1 },

  165.     [AV_PIX_FMT_Y400A]       = { 1, 0 },

  166.     [AV_PIX_FMT_BGR48BE]     = { 1, 1 },

  167.     [AV_PIX_FMT_BGR48LE]     = { 1, 1 },

  168.     [AV_PIX_FMT_BGRA64BE]    = { 0, 0 },

  169.     [AV_PIX_FMT_BGRA64LE]    = { 0, 0 },

  170.     [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },

  171.     [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },

  172.     [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },

  173.     [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },

  174.     [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },

  175.     [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },

  176.     [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },

  177.     [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },

  178.     [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },

  179.     [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },

  180.     [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },

  181.     [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },

  182.     [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },

  183.     [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },

  184.     [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },

  185.     [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },

  186.     [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },

  187.     [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },

  188.     [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },

  189.     [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },

  190.     [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },

  191.     [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },

  192.     [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },

  193.     [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },

  194.     [AV_PIX_FMT_GBRP]        = { 1, 1 },

  195.     [AV_PIX_FMT_GBRP9LE]     = { 1, 1 },

  196.     [AV_PIX_FMT_GBRP9BE]     = { 1, 1 },

  197.     [AV_PIX_FMT_GBRP10LE]    = { 1, 1 },

  198.     [AV_PIX_FMT_GBRP10BE]    = { 1, 1 },

  199.     [AV_PIX_FMT_GBRP12LE]    = { 1, 1 },

  200.     [AV_PIX_FMT_GBRP12BE]    = { 1, 1 },

  201.     [AV_PIX_FMT_GBRP14LE]    = { 1, 1 },

  202.     [AV_PIX_FMT_GBRP14BE]    = { 1, 1 },

  203.     [AV_PIX_FMT_GBRP16LE]    = { 1, 0 },

  204.     [AV_PIX_FMT_GBRP16BE]    = { 1, 0 },

  205.     [AV_PIX_FMT_XYZ12BE]     = { 1, 1, 1 },

  206.     [AV_PIX_FMT_XYZ12LE]     = { 1, 1, 1 },

  207.     [AV_PIX_FMT_GBRAP]       = { 1, 1 },

  208.     [AV_PIX_FMT_GBRAP16LE]   = { 1, 0 },

  209.     [AV_PIX_FMT_GBRAP16BE]   = { 1, 0 },

  210. };

  211. 

  212. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  213. {

  214.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  215.            format_entries[pix_fmt].is_supported_in : 0;

  216. }

  217. 

  218. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  219. {

  220.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  221.            format_entries[pix_fmt].is_supported_out : 0;

  222. }

  223. 

  224. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  225. {

  226.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  227.            format_entries[pix_fmt].is_supported_endianness : 0;

  228. }

  229. 

  230. #if FF_API_SWS_FORMAT_NAME

  231. const char *sws_format_name(enum AVPixelFormat format)

  232. {

  233.     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);

  234.     if (desc)

  235.         return desc->name;

  236.     else

  237.         return "Unknown format";

  238. }

  239. #endif

  240. 

  241. static double getSplineCoeff(double a, double b, double c, double d,

  242.                              double dist)

  243. {

  244.     if (dist <= 1.0)

  245.         return ((d * dist + c) * dist + b) * dist + a;

  246.     else

  247.         return getSplineCoeff(0.0,

  248.                                b + 2.0 * c + 3.0 * d,

  249.                                c + 3.0 * d,

  250.                               -b - 3.0 * c - 6.0 * d,

  251.                               dist - 1.0);

  252. }

  253. 

  254. static av_cold int get_local_pos(SwsContext *s, int chr_subsample, int pos, int dir)

  255. {

  256.     if (pos < 0) {

  257.         pos = (128 << chr_subsample) - 128;

  258.     }

  259.     pos += 128; // relative to ideal left edge

  260.     return pos >> chr_subsample;

  261. }

  262. 

  263. typedef struct {

  264.     int flag;                   ///< flag associated to the algorithm

  265.     const char *description;    ///< human-readable description

  266.     int size_factor;            ///< size factor used when initing the filters

  267. } ScaleAlgorithm;

  268. 

  269. static const ScaleAlgorithm scale_algorithms[] = {

  270.     { SWS_AREA,          "area averaging",                  1 /* downscale only, for upscale it is bilinear */ },

  271.     { SWS_BICUBIC,       "bicubic",                         4 },

  272.     { SWS_BICUBLIN,      "luma bicubic / chroma bilinear", -1 },

  273.     { SWS_BILINEAR,      "bilinear",                        2 },

  274.     { SWS_FAST_BILINEAR, "fast bilinear",                  -1 },

  275.     { SWS_GAUSS,         "Gaussian",                        8 /* infinite ;) */ },

  276.     { SWS_LANCZOS,       "Lanczos",                        -1 /* custom */ },

  277.     { SWS_POINT,         "nearest neighbor / point",       -1 },

  278.     { SWS_SINC,          "sinc",                           20 /* infinite ;) */ },

  279.     { SWS_SPLINE,        "bicubic spline",                 20 /* infinite :)*/ },

  280.     { SWS_X,             "experimental",                    8 },

  281. };

  282. 

  283. static av_cold int initFilter(int16_t **outFilter, int32_t **filterPos,

  284.                               int *outFilterSize, int xInc, int srcW,

  285.                               int dstW, int filterAlign, int one,

  286.                               int flags, int cpu_flags,

  287.                               SwsVector *srcFilter, SwsVector *dstFilter,

  288.                               double param[2], int srcPos, int dstPos)

  289. {

  290.     int i;

  291.     int filterSize;

  292.     int filter2Size;

  293.     int minFilterSize;

  294.     int64_t *filter    = NULL;

  295.     int64_t *filter2   = NULL;

  296.     const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));

  297.     int ret            = -1;

  298. 

  299.     emms_c(); // FIXME should not be required but IS (even for non-MMX versions)

  300. 

  301.     // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end

  302.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

  303. 

  304.     if (FFABS(xInc - 0x10000) < 10 && srcPos == dstPos) { // unscaled

  305.         int i;

  306.         filterSize = 1;

  307.         FF_ALLOCZ_OR_GOTO(NULL, filter,

  308.                           dstW * sizeof(*filter) * filterSize, fail);

  309. 

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

  311.             filter[i * filterSize] = fone;

  312.             (*filterPos)[i]        = i;

  313.         }

  314.     } else if (flags & SWS_POINT) { // lame looking point sampling mode

  315.         int i;

  316.         int64_t xDstInSrc;

  317.         filterSize = 1;

  318.         FF_ALLOC_OR_GOTO(NULL, filter,

  319.                          dstW * sizeof(*filter) * filterSize, fail);

  320. 

  321.         xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);

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

  323.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  324. 

  325.             (*filterPos)[i] = xx;

  326.             filter[i]       = fone;

  327.             xDstInSrc      += xInc;

  328.         }

  329.     } else if ((xInc <= (1 << 16) && (flags & SWS_AREA)) ||

  330.                (flags & SWS_FAST_BILINEAR)) { // bilinear upscale

  331.         int i;

  332.         int64_t xDstInSrc;

  333.         filterSize = 2;

  334.         FF_ALLOC_OR_GOTO(NULL, filter,

  335.                          dstW * sizeof(*filter) * filterSize, fail);

  336. 

  337.         xDstInSrc = ((dstPos*(int64_t)xInc)>>8) - ((srcPos*0x8000LL)>>7);

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

  339.             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

  340.             int j;

  341. 

  342.             (*filterPos)[i] = xx;

  343.             // bilinear upscale / linear interpolate / area averaging

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

  345.                 int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);

  346.                 if (coeff < 0)

  347.                     coeff = 0;

  348.                 filter[i * filterSize + j] = coeff;

  349.                 xx++;

  350.             }

  351.             xDstInSrc += xInc;

  352.         }

  353.     } else {

  354.         int64_t xDstInSrc;

  355.         int sizeFactor = -1;

  356. 

  357.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  358.             if (flags & scale_algorithms[i].flag) {

  359.                 sizeFactor = scale_algorithms[i].size_factor;

  360.                 break;

  361.             }

  362.         }

  363.         if (flags & SWS_LANCZOS)

  364.             sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;

  365.         av_assert0(sizeFactor > 0);

  366. 

  367.         if (xInc <= 1 << 16)

  368.             filterSize = 1 + sizeFactor;    // upscale

  369.         else

  370.             filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

  371. 

  372.         filterSize = FFMIN(filterSize, srcW - 2);

  373.         filterSize = FFMAX(filterSize, 1);

  374. 

  375.         FF_ALLOC_OR_GOTO(NULL, filter,

  376.                          dstW * sizeof(*filter) * filterSize, fail);

  377. 

  378.         xDstInSrc = ((dstPos*(int64_t)xInc)>>7) - ((srcPos*0x10000LL)>>7);

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

  380.             int xx = (xDstInSrc - ((filterSize - 2) << 16)) / (1 << 17);

  381.             int j;

  382.             (*filterPos)[i] = xx;

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

  384.                 int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;

  385.                 double floatd;

  386.                 int64_t coeff;

  387. 

  388.                 if (xInc > 1 << 16)

  389.                     d = d * dstW / srcW;

  390.                 floatd = d * (1.0 / (1 << 30));

  391. 

  392.                 if (flags & SWS_BICUBIC) {

  393.                     int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);

  394.                     int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

  395. 

  396.                     if (d >= 1LL << 31) {

  397.                         coeff = 0.0;

  398.                     } else {

  399.                         int64_t dd  = (d  * d) >> 30;

  400.                         int64_t ddd = (dd * d) >> 30;

  401. 

  402.                         if (d < 1LL << 30)

  403.                             coeff =  (12 * (1 << 24) -  9 * B - 6 * C) * ddd +

  404.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  405.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  406.                         else

  407.                             coeff =      (-B -  6 * C) * ddd +

  408.                                       (6 * B + 30 * C) * dd  +

  409.                                     (-12 * B - 48 * C) * d   +

  410.                                       (8 * B + 24 * C) * (1 << 30);

  411.                     }

  412.                     coeff /= (1LL<<54)/fone;

  413.                 }

  414. #if 0

  415.                 else if (flags & SWS_X) {

  416.                     double p  = param ? param * 0.01 : 0.3;

  417.                     coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;

  418.                     coeff    *= pow(2.0, -p * d * d);

  419.                 }

  420. #endif

  421.                 else if (flags & SWS_X) {

  422.                     double A = param[0] != SWS_PARAM_DEFAULT ? param[0] : 1.0;

  423.                     double c;

  424. 

  425.                     if (floatd < 1.0)

  426.                         c = cos(floatd * M_PI);

  427.                     else

  428.                         c = -1.0;

  429.                     if (c < 0.0)

  430.                         c = -pow(-c, A);

  431.                     else

  432.                         c = pow(c, A);

  433.                     coeff = (c * 0.5 + 0.5) * fone;

  434.                 } else if (flags & SWS_AREA) {

  435.                     int64_t d2 = d - (1 << 29);

  436.                     if (d2 * xInc < -(1LL << (29 + 16)))

  437.                         coeff = 1.0 * (1LL << (30 + 16));

  438.                     else if (d2 * xInc < (1LL << (29 + 16)))

  439.                         coeff = -d2 * xInc + (1LL << (29 + 16));

  440.                     else

  441.                         coeff = 0.0;

  442.                     coeff *= fone >> (30 + 16);

  443.                 } else if (flags & SWS_GAUSS) {

  444.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  445.                     coeff = (pow(2.0, -p * floatd * floatd)) * fone;

  446.                 } else if (flags & SWS_SINC) {

  447.                     coeff = (d ? sin(floatd * M_PI) / (floatd * M_PI) : 1.0) * fone;

  448.                 } else if (flags & SWS_LANCZOS) {

  449.                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;

  450.                     coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /

  451.                              (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;

  452.                     if (floatd > p)

  453.                         coeff = 0;

  454.                 } else if (flags & SWS_BILINEAR) {

  455.                     coeff = (1 << 30) - d;

  456.                     if (coeff < 0)

  457.                         coeff = 0;

  458.                     coeff *= fone >> 30;

  459.                 } else if (flags & SWS_SPLINE) {

  460.                     double p = -2.196152422706632;

  461.                     coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;

  462.                 } else {

  463.                     av_assert0(0);

  464.                 }

  465. 

  466.                 filter[i * filterSize + j] = coeff;

  467.                 xx++;

  468.             }

  469.             xDstInSrc += 2 * xInc;

  470.         }

  471.     }

  472. 

  473.     /* apply src & dst Filter to filter -> filter2

  474.      * av_free(filter);

  475.      */

  476.     av_assert0(filterSize > 0);

  477.     filter2Size = filterSize;

  478.     if (srcFilter)

  479.         filter2Size += srcFilter->length - 1;

  480.     if (dstFilter)

  481.         filter2Size += dstFilter->length - 1;

  482.     av_assert0(filter2Size > 0);

  483.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);

  484. 

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

  486.         int j, k;

  487. 

  488.         if (srcFilter) {

  489.             for (k = 0; k < srcFilter->length; k++) {

  490.                 for (j = 0; j < filterSize; j++)

  491.                     filter2[i * filter2Size + k + j] +=

  492.                         srcFilter->coeff[k] * filter[i * filterSize + j];

  493.             }

  494.         } else {

  495.             for (j = 0; j < filterSize; j++)

  496.                 filter2[i * filter2Size + j] = filter[i * filterSize + j];

  497.         }

  498.         // FIXME dstFilter

  499. 

  500.         (*filterPos)[i] += (filterSize - 1) / 2 - (filter2Size - 1) / 2;

  501.     }

  502.     av_freep(&filter);

  503. 

  504.     /* try to reduce the filter-size (step1 find size and shift left) */

  505.     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

  506.     minFilterSize = 0;

  507.     for (i = dstW - 1; i >= 0; i--) {

  508.         int min = filter2Size;

  509.         int j;

  510.         int64_t cutOff = 0.0;

  511. 

  512.         /* get rid of near zero elements on the left by shifting left */

  513.         for (j = 0; j < filter2Size; j++) {

  514.             int k;

  515.             cutOff += FFABS(filter2[i * filter2Size]);

  516. 

  517.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  518.                 break;

  519. 

  520.             /* preserve monotonicity because the core can't handle the

  521.              * filter otherwise */

  522.             if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])

  523.                 break;

  524. 

  525.             // move filter coefficients left

  526.             for (k = 1; k < filter2Size; k++)

  527.                 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];

  528.             filter2[i * filter2Size + k - 1] = 0;

  529.             (*filterPos)[i]++;

  530.         }

  531. 

  532.         cutOff = 0;

  533.         /* count near zeros on the right */

  534.         for (j = filter2Size - 1; j > 0; j--) {

  535.             cutOff += FFABS(filter2[i * filter2Size + j]);

  536. 

  537.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  538.                 break;

  539.             min--;

  540.         }

  541. 

  542.         if (min > minFilterSize)

  543.             minFilterSize = min;

  544.     }

  545. 

  546.     if (PPC_ALTIVEC(cpu_flags)) {

  547.         // we can handle the special case 4, so we don't want to go the full 8

  548.         if (minFilterSize < 5)

  549.             filterAlign = 4;

  550. 

  551.         /* We really don't want to waste our time doing useless computation, so

  552.          * fall back on the scalar C code for very small filters.

  553.          * Vectorizing is worth it only if you have a decent-sized vector. */

  554.         if (minFilterSize < 3)

  555.             filterAlign = 1;

  556.     }

  557. 

  558.     if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

  559.         // special case for unscaled vertical filtering

  560.         if (minFilterSize == 1 && filterAlign == 2)

  561.             filterAlign = 1;

  562.     }

  563. 

  564.     av_assert0(minFilterSize > 0);

  565.     filterSize = (minFilterSize + (filterAlign - 1)) & (~(filterAlign - 1));

  566.     av_assert0(filterSize > 0);

  567.     filter = av_malloc(filterSize * dstW * sizeof(*filter));

  568.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  569.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {

  570.         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreme scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);

  571.         goto fail;

  572.     }

  573.     *outFilterSize = filterSize;

  574. 

  575.     if (flags & SWS_PRINT_INFO)

  576.         av_log(NULL, AV_LOG_VERBOSE,

  577.                "SwScaler: reducing / aligning filtersize %d -> %d\n",

  578.                filter2Size, filterSize);

  579.     /* try to reduce the filter-size (step2 reduce it) */

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

  581.         int j;

  582. 

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

  584.             if (j >= filter2Size)

  585.                 filter[i * filterSize + j] = 0;

  586.             else

  587.                 filter[i * filterSize + j] = filter2[i * filter2Size + j];

  588.             if ((flags & SWS_BITEXACT) && j >= minFilterSize)

  589.                 filter[i * filterSize + j] = 0;

  590.         }

  591.     }

  592. 

  593.     // FIXME try to align filterPos if possible

  594. 

  595.     // fix borders

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

  597.         int j;

  598.         if ((*filterPos)[i] < 0) {

  599.             // move filter coefficients left to compensate for filterPos

  600.             for (j = 1; j < filterSize; j++) {

  601.                 int left = FFMAX(j + (*filterPos)[i], 0);

  602.                 filter[i * filterSize + left] += filter[i * filterSize + j];

  603.                 filter[i * filterSize + j]     = 0;

  604.             }

  605.             (*filterPos)[i]= 0;

  606.         }

  607. 

  608.         if ((*filterPos)[i] + filterSize > srcW) {

  609.             int shift = (*filterPos)[i] + filterSize - srcW;

  610.             // move filter coefficients right to compensate for filterPos

  611.             for (j = filterSize - 2; j >= 0; j--) {

  612.                 int right = FFMIN(j + shift, filterSize - 1);

  613.                 filter[i * filterSize + right] += filter[i * filterSize + j];

  614.                 filter[i * filterSize + j]      = 0;

  615.             }

  616.             (*filterPos)[i]= srcW - filterSize;

  617.         }

  618.     }

  619. 

  620.     // Note the +1 is for the MMX scaler which reads over the end

  621.     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

  622.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

  623.                       *outFilterSize * (dstW + 3) * sizeof(int16_t), fail);

  624. 

  625.     /* normalize & store in outFilter */

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

  627.         int j;

  628.         int64_t error = 0;

  629.         int64_t sum   = 0;

  630. 

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

  632.             sum += filter[i * filterSize + j];

  633.         }

  634.         sum = (sum + one / 2) / one;

  635.         if (!sum) {

  636.             av_log(NULL, AV_LOG_WARNING, "SwScaler: zero vector in scaling\n");

  637.             sum = 1;

  638.         }

  639.         for (j = 0; j < *outFilterSize; j++) {

  640.             int64_t v = filter[i * filterSize + j] + error;

  641.             int intV  = ROUNDED_DIV(v, sum);

  642.             (*outFilter)[i * (*outFilterSize) + j] = intV;

  643.             error                                  = v - intV * sum;

  644.         }

  645.     }

  646. 

  647.     (*filterPos)[dstW + 0] =

  648.     (*filterPos)[dstW + 1] =

  649.     (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will

  650.                                                       * read over the end */

  651.     for (i = 0; i < *outFilterSize; i++) {

  652.         int k = (dstW - 1) * (*outFilterSize) + i;

  653.         (*outFilter)[k + 1 * (*outFilterSize)] =

  654.         (*outFilter)[k + 2 * (*outFilterSize)] =

  655.         (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];

  656.     }

  657. 

  658.     ret = 0;

  659. 

  660. fail:

  661.     if(ret < 0)

  662.         av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");

  663.     av_free(filter);

  664.     av_free(filter2);

  665.     return ret;

  666. }

  667. 

  668. #if HAVE_MMXEXT_INLINE

  669. static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,

  670.                                        int16_t *filter, int32_t *filterPos,

  671.                                        int numSplits)

  672. {

  673.     uint8_t *fragmentA;

  674.     x86_reg imm8OfPShufW1A;

  675.     x86_reg imm8OfPShufW2A;

  676.     x86_reg fragmentLengthA;

  677.     uint8_t *fragmentB;

  678.     x86_reg imm8OfPShufW1B;

  679.     x86_reg imm8OfPShufW2B;

  680.     x86_reg fragmentLengthB;

  681.     int fragmentPos;

  682. 

  683.     int xpos, i;

  684. 

  685.     // create an optimized horizontal scaling routine

  686.     /* This scaler is made of runtime-generated MMXEXT code using specially tuned

  687.      * pshufw instructions. For every four output pixels, if four input pixels

  688.      * are enough for the fast bilinear scaling, then a chunk of fragmentB is

  689.      * used. If five input pixels are needed, then a chunk of fragmentA is used.

  690.      */

  691. 

  692.     // code fragment

  693. 

  694.     __asm__ volatile (

  695.         "jmp                         9f                 \n\t"

  696.         // Begin

  697.         "0:                                             \n\t"

  698.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  699.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  700.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  701.         "punpcklbw                %%mm7, %%mm1          \n\t"

  702.         "punpcklbw                %%mm7, %%mm0          \n\t"

  703.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  704.         "1:                                             \n\t"

  705.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  706.         "2:                                             \n\t"

  707.         "psubw                    %%mm1, %%mm0          \n\t"

  708.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  709.         "pmullw                   %%mm3, %%mm0          \n\t"

  710.         "psllw                       $7, %%mm1          \n\t"

  711.         "paddw                    %%mm1, %%mm0          \n\t"

  712. 

  713.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  714. 

  715.         "add                         $8, %%"REG_a"      \n\t"

  716.         // End

  717.         "9:                                             \n\t"

  718.         // "int $3                                         \n\t"

  719.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  720.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  721.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  722.         "dec                         %1                 \n\t"

  723.         "dec                         %2                 \n\t"

  724.         "sub                         %0, %1             \n\t"

  725.         "sub                         %0, %2             \n\t"

  726.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  727.         "sub                         %0, %3             \n\t"

  728. 

  729. 

  730.         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  731.           "=r" (fragmentLengthA)

  732.         );

  733. 

  734.     __asm__ volatile (

  735.         "jmp                         9f                 \n\t"

  736.         // Begin

  737.         "0:                                             \n\t"

  738.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  739.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  740.         "punpcklbw                %%mm7, %%mm0          \n\t"

  741.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  742.         "1:                                             \n\t"

  743.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  744.         "2:                                             \n\t"

  745.         "psubw                    %%mm1, %%mm0          \n\t"

  746.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  747.         "pmullw                   %%mm3, %%mm0          \n\t"

  748.         "psllw                       $7, %%mm1          \n\t"

  749.         "paddw                    %%mm1, %%mm0          \n\t"

  750. 

  751.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  752. 

  753.         "add                         $8, %%"REG_a"      \n\t"

  754.         // End

  755.         "9:                                             \n\t"

  756.         // "int                       $3                   \n\t"

  757.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  758.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  759.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  760.         "dec                         %1                 \n\t"

  761.         "dec                         %2                 \n\t"

  762.         "sub                         %0, %1             \n\t"

  763.         "sub                         %0, %2             \n\t"

  764.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  765.         "sub                         %0, %3             \n\t"

  766. 

  767. 

  768.         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  769.           "=r" (fragmentLengthB)

  770.         );

  771. 

  772.     xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers

  773.     fragmentPos = 0;

  774. 

  775.     for (i = 0; i < dstW / numSplits; i++) {

  776.         int xx = xpos >> 16;

  777. 

  778.         if ((i & 3) == 0) {

  779.             int a                  = 0;

  780.             int b                  = ((xpos + xInc) >> 16) - xx;

  781.             int c                  = ((xpos + xInc * 2) >> 16) - xx;

  782.             int d                  = ((xpos + xInc * 3) >> 16) - xx;

  783.             int inc                = (d + 1 < 4);

  784.             uint8_t *fragment      = inc ? fragmentB : fragmentA;

  785.             x86_reg imm8OfPShufW1  = inc ? imm8OfPShufW1B : imm8OfPShufW1A;

  786.             x86_reg imm8OfPShufW2  = inc ? imm8OfPShufW2B : imm8OfPShufW2A;

  787.             x86_reg fragmentLength = inc ? fragmentLengthB : fragmentLengthA;

  788.             int maxShift           = 3 - (d + inc);

  789.             int shift              = 0;

  790. 

  791.             if (filterCode) {

  792.                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;

  793.                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;

  794.                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;

  795.                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;

  796.                 filterPos[i / 2] = xx;

  797. 

  798.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  799. 

  800.                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |

  801.                                                           ((b + inc) << 2) |

  802.                                                           ((c + inc) << 4) |

  803.                                                           ((d + inc) << 6);

  804.                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |

  805.                                                                (c << 4) |

  806.                                                                (d << 6);

  807. 

  808.                 if (i + 4 - inc >= dstW)

  809.                     shift = maxShift;               // avoid overread

  810.                 else if ((filterPos[i / 2] & 3) <= maxShift)

  811.                     shift = filterPos[i / 2] & 3;   // align

  812. 

  813.                 if (shift && i >= shift) {

  814.                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;

  815.                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;

  816.                     filterPos[i / 2]                        -= shift;

  817.                 }

  818.             }

  819. 

  820.             fragmentPos += fragmentLength;

  821. 

  822.             if (filterCode)

  823.                 filterCode[fragmentPos] = RET;

  824.         }

  825.         xpos += xInc;

  826.     }

  827.     if (filterCode)

  828.         filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part

  829. 

  830.     return fragmentPos + 1;

  831. }

  832. #endif /* HAVE_MMXEXT_INLINE */

  833. 

  834. static void fill_rgb2yuv_table(SwsContext *c, const int table[4], int dstRange)

  835. {

  836.     int64_t W, V, Z, Cy, Cu, Cv;

  837.     int64_t vr =  table[0];

  838.     int64_t ub =  table[1];

  839.     int64_t ug = -table[2];

  840.     int64_t vg = -table[3];

  841.     int64_t ONE = 65536;

  842.     int64_t cy = ONE;

  843.     uint8_t *p = (uint8_t*)c->input_rgb2yuv_table;

  844.     int i;

  845.     static const int8_t map[] = {

  846.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  847.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  848.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  849.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  850.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  851.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  852.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  853.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  854.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  855.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  856.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  857.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  858.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  859.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  860.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  861.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  862.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  863.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  864.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  865.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  866.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  867.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  868.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  869.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  870.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  871.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  872.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  873.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  874.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  875.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  876.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  877.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

  878.     BY_IDX, GY_IDX, RY_IDX, -1    , -1    , -1    , -1    , -1    , //32

  879.     BU_IDX, GU_IDX, RU_IDX, -1    , -1    , -1    , -1    , -1    , //33

  880.     BV_IDX, GV_IDX, RV_IDX, -1    , -1    , -1    , -1    , -1    , //34

  881.     };

  882. 

  883.     dstRange = 0; //FIXME range = 1 is handled elsewhere

  884. 

  885.     if (!dstRange) {

  886.         cy = cy * 255 / 219;

  887.     } else {

  888.         vr = vr * 224 / 255;

  889.         ub = ub * 224 / 255;

  890.         ug = ug * 224 / 255;

  891.         vg = vg * 224 / 255;

  892.     }

  893.     W = ROUNDED_DIV(ONE*ONE*ug, ub);

  894.     V = ROUNDED_DIV(ONE*ONE*vg, vr);

  895.     Z = ONE*ONE-W-V;

  896. 

  897.     Cy = ROUNDED_DIV(cy*Z, ONE);

  898.     Cu = ROUNDED_DIV(ub*Z, ONE);

  899.     Cv = ROUNDED_DIV(vr*Z, ONE);

  900. 

  901.     c->input_rgb2yuv_table[RY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cy);

  902.     c->input_rgb2yuv_table[GY_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cy);

  903.     c->input_rgb2yuv_table[BY_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cy);

  904. 

  905.     c->input_rgb2yuv_table[RU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*V        , Cu);

  906.     c->input_rgb2yuv_table[GU_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cu);

  907.     c->input_rgb2yuv_table[BU_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(Z+W)    , Cu);

  908. 

  909.     c->input_rgb2yuv_table[RV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*(V+Z)    , Cv);

  910.     c->input_rgb2yuv_table[GV_IDX] = -ROUNDED_DIV((1 << RGB2YUV_SHIFT)*ONE*ONE  , Cv);

  911.     c->input_rgb2yuv_table[BV_IDX] =  ROUNDED_DIV((1 << RGB2YUV_SHIFT)*W        , Cv);

  912. 

  913.     if(/*!dstRange && */!memcmp(table, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], sizeof(ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]))) {

  914.         c->input_rgb2yuv_table[BY_IDX] =  ((int)(0.114 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  915.         c->input_rgb2yuv_table[BV_IDX] = (-(int)(0.081 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  916.         c->input_rgb2yuv_table[BU_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  917.         c->input_rgb2yuv_table[GY_IDX] =  ((int)(0.587 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  918.         c->input_rgb2yuv_table[GV_IDX] = (-(int)(0.419 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  919.         c->input_rgb2yuv_table[GU_IDX] = (-(int)(0.331 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  920.         c->input_rgb2yuv_table[RY_IDX] =  ((int)(0.299 * 219 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  921.         c->input_rgb2yuv_table[RV_IDX] =  ((int)(0.500 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  922.         c->input_rgb2yuv_table[RU_IDX] = (-(int)(0.169 * 224 / 255 * (1 << RGB2YUV_SHIFT) + 0.5));

  923.     }

  924.     for(i=0; i<FF_ARRAY_ELEMS(map); i++)

  925.         AV_WL16(p + 16*4 + 2*i, map[i] >= 0 ? c->input_rgb2yuv_table[map[i]] : 0);

  926. }

  927. 

  928. static void fill_xyztables(struct SwsContext *c)

  929. {

  930.     int i;

  931.     double xyzgamma = XYZ_GAMMA;

  932.     double rgbgamma = 1.0 / RGB_GAMMA;

  933.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  934.     double rgbgammainv = RGB_GAMMA;

  935.     static const int16_t xyz2rgb_matrix[3][4] = {

  936.         {13270, -6295, -2041},

  937.         {-3969,  7682,   170},

  938.         {  228,  -835,  4329} };

  939.     static const int16_t rgb2xyz_matrix[3][4] = {

  940.         {1689, 1464,  739},

  941.         { 871, 2929,  296},

  942.         {  79,  488, 3891} };

  943.     static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096], xyzgammainv_tab[4096], rgbgammainv_tab[4096];

  944. 

  945.     memcpy(c->xyz2rgb_matrix, xyz2rgb_matrix, sizeof(c->xyz2rgb_matrix));

  946.     memcpy(c->rgb2xyz_matrix, rgb2xyz_matrix, sizeof(c->rgb2xyz_matrix));

  947.     c->xyzgamma = xyzgamma_tab;

  948.     c->rgbgamma = rgbgamma_tab;

  949.     c->xyzgammainv = xyzgammainv_tab;

  950.     c->rgbgammainv = rgbgammainv_tab;

  951. 

  952.     if (rgbgamma_tab[4095])

  953.         return;

  954. 

  955.     /* set gamma vectors */

  956.     for (i = 0; i < 4096; i++) {

  957.         xyzgamma_tab[i] = lrint(pow(i / 4095.0, xyzgamma) * 4095.0);

  958.         rgbgamma_tab[i] = lrint(pow(i / 4095.0, rgbgamma) * 4095.0);

  959.         xyzgammainv_tab[i] = lrint(pow(i / 4095.0, xyzgammainv) * 4095.0);

  960.         rgbgammainv_tab[i] = lrint(pow(i / 4095.0, rgbgammainv) * 4095.0);

  961.     }

  962. }

  963. 

  964. int sws_setColorspaceDetails(struct SwsContext *c, const int inv_table[4],

  965.                              int srcRange, const int table[4], int dstRange,

  966.                              int brightness, int contrast, int saturation)

  967. {

  968.     const AVPixFmtDescriptor *desc_dst;

  969.     const AVPixFmtDescriptor *desc_src;

  970.     memmove(c->srcColorspaceTable, inv_table, sizeof(int) * 4);

  971.     memmove(c->dstColorspaceTable, table, sizeof(int) * 4);

  972. 

  973.     handle_formats(c);

  974.     desc_dst = av_pix_fmt_desc_get(c->dstFormat);

  975.     desc_src = av_pix_fmt_desc_get(c->srcFormat);

  976. 

  977.     if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))

  978.         dstRange = 0;

  979.     if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))

  980.         srcRange = 0;

  981. 

  982.     c->brightness = brightness;

  983.     c->contrast   = contrast;

  984.     c->saturation = saturation;

  985.     c->srcRange   = srcRange;

  986.     c->dstRange   = dstRange;

  987. 

  988.     if ((isYUV(c->dstFormat) || isGray(c->dstFormat)) && (isYUV(c->srcFormat) || isGray(c->srcFormat)))

  989.         return -1;

  990. 

  991.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  992.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  993. 

  994.     if (!isYUV(c->dstFormat) && !isGray(c->dstFormat)) {

  995.         ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,

  996.                                  contrast, saturation);

  997.         // FIXME factorize

  998. 

  999.         if (ARCH_PPC)

  1000.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  1001.                                        contrast, saturation);

  1002.     }

  1003. 

  1004.     fill_rgb2yuv_table(c, table, dstRange);

  1005. 

  1006.     return 0;

  1007. }

  1008. 

  1009. int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,

  1010.                              int *srcRange, int **table, int *dstRange,

  1011.                              int *brightness, int *contrast, int *saturation)

  1012. {

  1013.     if (!c )

  1014.         return -1;

  1015. 

  1016.     *inv_table  = c->srcColorspaceTable;

  1017.     *table      = c->dstColorspaceTable;

  1018.     *srcRange   = c->srcRange;

  1019.     *dstRange   = c->dstRange;

  1020.     *brightness = c->brightness;

  1021.     *contrast   = c->contrast;

  1022.     *saturation = c->saturation;

  1023. 

  1024.     return 0;

  1025. }

  1026. 

  1027. static int handle_jpeg(enum AVPixelFormat *format)

  1028. {

  1029.     switch (*format) {

  1030.     case AV_PIX_FMT_YUVJ420P:

  1031.         *format = AV_PIX_FMT_YUV420P;

  1032.         return 1;

  1033.     case AV_PIX_FMT_YUVJ411P:

  1034.         *format = AV_PIX_FMT_YUV411P;

  1035.         return 1;

  1036.     case AV_PIX_FMT_YUVJ422P:

  1037.         *format = AV_PIX_FMT_YUV422P;

  1038.         return 1;

  1039.     case AV_PIX_FMT_YUVJ444P:

  1040.         *format = AV_PIX_FMT_YUV444P;

  1041.         return 1;

  1042.     case AV_PIX_FMT_YUVJ440P:

  1043.         *format = AV_PIX_FMT_YUV440P;

  1044.         return 1;

  1045.     case AV_PIX_FMT_GRAY8:

  1046.         return 1;

  1047.     default:

  1048.         return 0;

  1049.     }

  1050. }

  1051. 

  1052. static int handle_0alpha(enum AVPixelFormat *format)

  1053. {

  1054.     switch (*format) {

  1055.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1056.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1057.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1058.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1059.     default:                                          return 0;

  1060.     }

  1061. }

  1062. 

  1063. static int handle_xyz(enum AVPixelFormat *format)

  1064. {

  1065.     switch (*format) {

  1066.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1067.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1068.     default:                                                return 0;

  1069.     }

  1070. }

  1071. 

  1072. static void handle_formats(SwsContext *c)

  1073. {

  1074.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1075.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1076.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1077.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1078.     if (c->srcXYZ || c->dstXYZ)

  1079.         fill_xyztables(c);

  1080. }

  1081. 

  1082. SwsContext *sws_alloc_context(void)

  1083. {

  1084.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1085. 

  1086.     if (c) {

  1087.         c->av_class = &sws_context_class;

  1088.         av_opt_set_defaults(c);

  1089.     }

  1090. 

  1091.     return c;

  1092. }

  1093. 

  1094. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1095.                              SwsFilter *dstFilter)

  1096. {

  1097.     int i, j;

  1098.     int usesVFilter, usesHFilter;

  1099.     int unscaled;

  1100.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1101.     int srcW              = c->srcW;

  1102.     int srcH              = c->srcH;

  1103.     int dstW              = c->dstW;

  1104.     int dstH              = c->dstH;

  1105.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1106.     int flags, cpu_flags;

  1107.     enum AVPixelFormat srcFormat = c->srcFormat;

  1108.     enum AVPixelFormat dstFormat = c->dstFormat;

  1109.     const AVPixFmtDescriptor *desc_src;

  1110.     const AVPixFmtDescriptor *desc_dst;

  1111. 

  1112.     cpu_flags = av_get_cpu_flags();

  1113.     flags     = c->flags;

  1114.     emms_c();

  1115.     if (!rgb15to16)

  1116.         sws_rgb2rgb_init();

  1117. 

  1118.     unscaled = (srcW == dstW && srcH == dstH);

  1119. 

  1120.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1121.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1122. 

  1123.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1124.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1125. 

  1126.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1127.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1128.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1129.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1130. 

  1131.     handle_formats(c);

  1132.     srcFormat = c->srcFormat;

  1133.     dstFormat = c->dstFormat;

  1134.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1135.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1136. 

  1137.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1138.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1139.     if (!sws_isSupportedInput(srcFormat)) {

  1140.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1141.                av_get_pix_fmt_name(srcFormat));

  1142.         return AVERROR(EINVAL);

  1143.     }

  1144.     if (!sws_isSupportedOutput(dstFormat)) {

  1145.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1146.                av_get_pix_fmt_name(dstFormat));

  1147.         return AVERROR(EINVAL);

  1148.     }

  1149.     }

  1150. 

  1151.     i = flags & (SWS_POINT         |

  1152.                  SWS_AREA          |

  1153.                  SWS_BILINEAR      |

  1154.                  SWS_FAST_BILINEAR |

  1155.                  SWS_BICUBIC       |

  1156.                  SWS_X             |

  1157.                  SWS_GAUSS         |

  1158.                  SWS_LANCZOS       |

  1159.                  SWS_SINC          |

  1160.                  SWS_SPLINE        |

  1161.                  SWS_BICUBLIN);

  1162. 

  1163.     /* provide a default scaler if not set by caller */

  1164.     if (!i) {

  1165.         if (dstW < srcW && dstH < srcH)

  1166.             flags |= SWS_BICUBIC;

  1167.         else if (dstW > srcW && dstH > srcH)

  1168.             flags |= SWS_BICUBIC;

  1169.         else

  1170.             flags |= SWS_BICUBIC;

  1171.         c->flags = flags;

  1172.     } else if (i & (i - 1)) {

  1173.         av_log(c, AV_LOG_ERROR,

  1174.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1175.         return AVERROR(EINVAL);

  1176.     }

  1177.     /* sanity check */

  1178.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1179.         /* FIXME check if these are enough and try to lower them after

  1180.          * fixing the relevant parts of the code */

  1181.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1182.                srcW, srcH, dstW, dstH);

  1183.         return AVERROR(EINVAL);

  1184.     }

  1185. 

  1186.     if (!dstFilter)

  1187.         dstFilter = &dummyFilter;

  1188.     if (!srcFilter)

  1189.         srcFilter = &dummyFilter;

  1190. 

  1191.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1192.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1193.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1194.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1195.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1196. 

  1197.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1198.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1199.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1200.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1201.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1202.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1203.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1204.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1205. 

  1206.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1207.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1208. 

  1209.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1210.         if (dstW&1) {

  1211.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1212.             flags |= SWS_FULL_CHR_H_INT;

  1213.             c->flags = flags;

  1214.         }

  1215. 

  1216.         if (   c->chrSrcHSubSample == 0

  1217.             && c->chrSrcVSubSample == 0

  1218.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1219.             && !(c->flags & SWS_FAST_BILINEAR)

  1220.         ) {

  1221.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1222.             flags |= SWS_FULL_CHR_H_INT;

  1223.             c->flags = flags;

  1224.         }

  1225.     }

  1226. 

  1227.     if (c->dither == SWS_DITHER_AUTO) {

  1228.         if (flags & SWS_ERROR_DIFFUSION)

  1229.             c->dither = SWS_DITHER_ED;

  1230.     }

  1231. 

  1232.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1233.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1234.        dstFormat == AV_PIX_FMT_BGR8 ||

  1235.        dstFormat == AV_PIX_FMT_RGB8) {

  1236.         if (c->dither == SWS_DITHER_AUTO)

  1237.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1238.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1239.             if (c->dither == SWS_DITHER_ED) {

  1240.                 av_log(c, AV_LOG_DEBUG,

  1241.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1242.                     av_get_pix_fmt_name(dstFormat));

  1243.                 flags   |= SWS_FULL_CHR_H_INT;

  1244.                 c->flags = flags;

  1245.             }

  1246.         }

  1247.         if (flags & SWS_FULL_CHR_H_INT) {

  1248.             if (c->dither == SWS_DITHER_BAYER) {

  1249.                 av_log(c, AV_LOG_DEBUG,

  1250.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1251.                     av_get_pix_fmt_name(dstFormat));

  1252.                 c->dither = SWS_DITHER_ED;

  1253.             }

  1254.         }

  1255.     }

  1256.     if (isPlanarRGB(dstFormat)) {

  1257.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1258.             av_log(c, AV_LOG_DEBUG,

  1259.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1260.                    av_get_pix_fmt_name(dstFormat));

  1261.             flags   |= SWS_FULL_CHR_H_INT;

  1262.             c->flags = flags;

  1263.         }

  1264.     }

  1265. 

  1266.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1267.      * chroma interpolation */

  1268.     if (flags & SWS_FULL_CHR_H_INT &&

  1269.         isAnyRGB(dstFormat)        &&

  1270.         !isPlanarRGB(dstFormat)    &&

  1271.         dstFormat != AV_PIX_FMT_RGBA  &&

  1272.         dstFormat != AV_PIX_FMT_ARGB  &&

  1273.         dstFormat != AV_PIX_FMT_BGRA  &&

  1274.         dstFormat != AV_PIX_FMT_ABGR  &&

  1275.         dstFormat != AV_PIX_FMT_RGB24 &&

  1276.         dstFormat != AV_PIX_FMT_BGR24 &&

  1277.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1278.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1279.         dstFormat != AV_PIX_FMT_BGR8 &&

  1280.         dstFormat != AV_PIX_FMT_RGB8

  1281.     ) {

  1282.         av_log(c, AV_LOG_WARNING,

  1283.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1284.                av_get_pix_fmt_name(dstFormat));

  1285.         flags   &= ~SWS_FULL_CHR_H_INT;

  1286.         c->flags = flags;

  1287.     }

  1288.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1289.         c->chrDstHSubSample = 1;

  1290. 

  1291.     // drop some chroma lines if the user wants it

  1292.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1293.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1294.     c->chrSrcVSubSample += c->vChrDrop;

  1295. 

  1296.     /* drop every other pixel for chroma calculation unless user

  1297.      * wants full chroma */

  1298.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1299.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1300.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1301.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1302.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1303.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1304.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1305.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1306.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1307.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1308.          (flags & SWS_FAST_BILINEAR)))

  1309.         c->chrSrcHSubSample = 1;

  1310. 

  1311.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1312.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1313.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1314.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1315.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1316. 

  1317.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1318. 

  1319.     /* unscaled special cases */

  1320.     if (unscaled && !usesHFilter && !usesVFilter &&

  1321.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1322.         ff_get_unscaled_swscale(c);

  1323. 

  1324.         if (c->swscale) {

  1325.             if (flags & SWS_PRINT_INFO)

  1326.                 av_log(c, AV_LOG_INFO,

  1327.                        "using unscaled %s -> %s special converter\n",

  1328.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1329.             return 0;

  1330.         }

  1331.     }

  1332. 

  1333.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1334.     if (c->srcBpc < 8)

  1335.         c->srcBpc = 8;

  1336.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1337.     if (c->dstBpc < 8)

  1338.         c->dstBpc = 8;

  1339.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1340.         c->srcBpc = 16;

  1341.     if (c->dstBpc == 16)

  1342.         dst_stride <<= 1;

  1343. 

  1344.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1345.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1346.                              c->chrDstW >= c->chrSrcW &&

  1347.                              (srcW & 15) == 0;

  1348.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1349. 

  1350.             && (flags & SWS_FAST_BILINEAR)) {

  1351.             if (flags & SWS_PRINT_INFO)

  1352.                 av_log(c, AV_LOG_INFO,

  1353.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1354.         }

  1355.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1356.             c->canMMXEXTBeUsed = 0;

  1357.     } else

  1358.         c->canMMXEXTBeUsed = 0;

  1359. 

  1360.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1361.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1362. 

  1363.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1364.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1365.      * correct scaling.

  1366.      * n-2 is the last chrominance sample available.

  1367.      * This is not perfect, but no one should notice the difference, the more

  1368.      * correct variant would be like the vertical one, but that would require

  1369.      * some special code for the first and last pixel */

  1370.     if (flags & SWS_FAST_BILINEAR) {

  1371.         if (c->canMMXEXTBeUsed) {

  1372.             c->lumXInc += 20;

  1373.             c->chrXInc += 20;

  1374.         }

  1375.         // we don't use the x86 asm scaler if MMX is available

  1376.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1377.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1378.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1379.         }

  1380.     }

  1381. 

  1382. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1383. 

  1384.     /* precalculate horizontal scaler filter coefficients */

  1385.     {

  1386. #if HAVE_MMXEXT_INLINE

  1387. // can't downscale !!!

  1388.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1389.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1390.                                                              NULL, NULL, 8);

  1391.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1392.                                                              NULL, NULL, NULL, 4);

  1393. 

  1394. #if USE_MMAP

  1395.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1396.                                           PROT_READ | PROT_WRITE,

  1397.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1398.                                           -1, 0);

  1399.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1400.                                           PROT_READ | PROT_WRITE,

  1401.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1402.                                           -1, 0);

  1403. #elif HAVE_VIRTUALALLOC

  1404.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1405.                                                   c->lumMmxextFilterCodeSize,

  1406.                                                   MEM_COMMIT,

  1407.                                                   PAGE_EXECUTE_READWRITE);

  1408.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1409.                                                   c->chrMmxextFilterCodeSize,

  1410.                                                   MEM_COMMIT,

  1411.                                                   PAGE_EXECUTE_READWRITE);

  1412. #else

  1413.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1414.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1415. #endif

  1416. 

  1417. #ifdef MAP_ANONYMOUS

  1418.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1419. #else

  1420.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1421. #endif

  1422.             {

  1423.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1424.                 return AVERROR(ENOMEM);

  1425.             }

  1426. 

  1427.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1428.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1429.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1430.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1431. 

  1432.             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1433.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1434.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1435.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1436. 

  1437. #if USE_MMAP

  1438.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1439.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1440.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1441.                 goto fail;

  1442.             }

  1443. #endif

  1444.         } else

  1445. #endif /* HAVE_MMXEXT_INLINE */

  1446.         {

  1447.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1448.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1449. 

  1450.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1451.                            &c->hLumFilterSize, c->lumXInc,

  1452.                            srcW, dstW, filterAlign, 1 << 14,

  1453.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1454.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1455.                            c->param,

  1456.                            get_local_pos(c, 0, 0, 0),

  1457.                            get_local_pos(c, 0, 0, 0)) < 0)

  1458.                 goto fail;

  1459.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1460.                            &c->hChrFilterSize, c->chrXInc,

  1461.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1462.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1463.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1464.                            c->param,

  1465.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1466.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)

  1467.                 goto fail;

  1468.         }

  1469.     } // initialize horizontal stuff

  1470. 

  1471.     /* precalculate vertical scaler filter coefficients */

  1472.     {

  1473.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1474.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1475. 

  1476.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1477.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1478.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1479.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1480.                        c->param,

  1481.                        get_local_pos(c, 0, 0, 1),

  1482.                        get_local_pos(c, 0, 0, 1)) < 0)

  1483.             goto fail;

  1484.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1485.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1486.                        filterAlign, (1 << 12),

  1487.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1488.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1489.                        c->param,

  1490.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1491.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)

  1492. 

  1493.             goto fail;

  1494. 

  1495. #if HAVE_ALTIVEC

  1496.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1497.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1498. 

  1499.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1500.             int j;

  1501.             short *p = (short *)&c->vYCoeffsBank[i];

  1502.             for (j = 0; j < 8; j++)

  1503.                 p[j] = c->vLumFilter[i];

  1504.         }

  1505. 

  1506.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1507.             int j;

  1508.             short *p = (short *)&c->vCCoeffsBank[i];

  1509.             for (j = 0; j < 8; j++)

  1510.                 p[j] = c->vChrFilter[i];

  1511.         }

  1512. #endif

  1513.     }

  1514. 

  1515.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1516.     c->vLumBufSize = c->vLumFilterSize;

  1517.     c->vChrBufSize = c->vChrFilterSize;

  1518.     for (i = 0; i < dstH; i++) {

  1519.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1520.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1521.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1522.                                << c->chrSrcVSubSample));

  1523. 

  1524.         nextSlice >>= c->chrSrcVSubSample;

  1525.         nextSlice <<= c->chrSrcVSubSample;

  1526.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1527.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1528.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1529.             (nextSlice >> c->chrSrcVSubSample))

  1530.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1531.                              c->vChrFilterPos[chrI];

  1532.     }

  1533. 

  1534.     for (i = 0; i < 4; i++)

  1535.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1536. 

  1537.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1538.      * need to allocate several megabytes to handle all possible cases) */

  1539.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1540.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1541.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1542.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1543.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1544.     /* Note we need at least one pixel more at the end because of the MMX code

  1545.      * (just in case someone wants to replace the 4000/8000). */

  1546.     /* align at 16 bytes for AltiVec */

  1547.     for (i = 0; i < c->vLumBufSize; i++) {

  1548.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1549.                           dst_stride + 16, fail);

  1550.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1551.     }

  1552.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1553.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1554.     c->uv_offx2 = dst_stride + 16;

  1555.     for (i = 0; i < c->vChrBufSize; i++) {

  1556.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1557.                          dst_stride * 2 + 32, fail);

  1558.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1559.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1560.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1561.     }

  1562.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1563.         for (i = 0; i < c->vLumBufSize; i++) {

  1564.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1565.                               dst_stride + 16, fail);

  1566.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1567.         }

  1568. 

  1569.     // try to avoid drawing green stuff between the right end and the stride end

  1570.     for (i = 0; i < c->vChrBufSize; i++)

  1571.         if(desc_dst->comp[0].depth_minus1 == 15){

  1572.             av_assert0(c->dstBpc > 14);

  1573.             for(j=0; j<dst_stride/2+1; j++)

  1574.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1575.         } else

  1576.             for(j=0; j<dst_stride+1; j++)

  1577.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1578. 

  1579.     av_assert0(c->chrDstH <= dstH);

  1580. 

  1581.     if (flags & SWS_PRINT_INFO) {

  1582.         const char *scaler = NULL, *cpucaps;

  1583. 

  1584.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1585.             if (flags & scale_algorithms[i].flag) {

  1586.                 scaler = scale_algorithms[i].description;

  1587.                 break;

  1588.             }

  1589.         }

  1590.         if (!scaler)

  1591.             scaler =  "ehh flags invalid?!";

  1592.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1593.                scaler,

  1594.                av_get_pix_fmt_name(srcFormat),

  1595. #ifdef DITHER1XBPP

  1596.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1597.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1598.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1599.                                                              "dithered " : "",

  1600. #else

  1601.                "",

  1602. #endif

  1603.                av_get_pix_fmt_name(dstFormat));

  1604. 

  1605.         if (INLINE_MMXEXT(cpu_flags))

  1606.             cpucaps = "MMXEXT";

  1607.         else if (INLINE_AMD3DNOW(cpu_flags))

  1608.             cpucaps = "3DNOW";

  1609.         else if (INLINE_MMX(cpu_flags))

  1610.             cpucaps = "MMX";

  1611.         else if (PPC_ALTIVEC(cpu_flags))

  1612.             cpucaps = "AltiVec";

  1613.         else

  1614.             cpucaps = "C";

  1615. 

  1616.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1617. 

  1618.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1619.         av_log(c, AV_LOG_DEBUG,

  1620.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1621.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1622.         av_log(c, AV_LOG_DEBUG,

  1623.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1624.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1625.                c->chrXInc, c->chrYInc);

  1626.     }

  1627. 

  1628.     c->swscale = ff_getSwsFunc(c);

  1629.     return 0;

  1630. fail: // FIXME replace things by appropriate error codes

  1631.     return -1;

  1632. }

  1633. 

  1634. #if FF_API_SWS_GETCONTEXT

  1635. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1636.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1637.                            int flags, SwsFilter *srcFilter,

  1638.                            SwsFilter *dstFilter, const double *param)

  1639. {

  1640.     SwsContext *c;

  1641. 

  1642.     if (!(c = sws_alloc_context()))

  1643.         return NULL;

  1644. 

  1645.     c->flags     = flags;

  1646.     c->srcW      = srcW;

  1647.     c->srcH      = srcH;

  1648.     c->dstW      = dstW;

  1649.     c->dstH      = dstH;

  1650.     c->srcFormat = srcFormat;

  1651.     c->dstFormat = dstFormat;

  1652. 

  1653.     if (param) {

  1654.         c->param[0] = param[0];

  1655.         c->param[1] = param[1];

  1656.     }

  1657. 

  1658.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1659.         sws_freeContext(c);

  1660.         return NULL;

  1661.     }

  1662. 

  1663.     return c;

  1664. }

  1665. #endif

  1666. 

  1667. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1668.                                 float lumaSharpen, float chromaSharpen,

  1669.                                 float chromaHShift, float chromaVShift,

  1670.                                 int verbose)

  1671. {

  1672.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1673.     if (!filter)

  1674.         return NULL;

  1675. 

  1676.     if (lumaGBlur != 0.0) {

  1677.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1678.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1679.     } else {

  1680.         filter->lumH = sws_getIdentityVec();

  1681.         filter->lumV = sws_getIdentityVec();

  1682.     }

  1683. 

  1684.     if (chromaGBlur != 0.0) {

  1685.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1686.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1687.     } else {

  1688.         filter->chrH = sws_getIdentityVec();

  1689.         filter->chrV = sws_getIdentityVec();

  1690.     }

  1691. 

  1692.     if (chromaSharpen != 0.0) {

  1693.         SwsVector *id = sws_getIdentityVec();

  1694.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1695.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1696.         sws_addVec(filter->chrH, id);

  1697.         sws_addVec(filter->chrV, id);

  1698.         sws_freeVec(id);

  1699.     }

  1700. 

  1701.     if (lumaSharpen != 0.0) {

  1702.         SwsVector *id = sws_getIdentityVec();

  1703.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1704.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1705.         sws_addVec(filter->lumH, id);

  1706.         sws_addVec(filter->lumV, id);

  1707.         sws_freeVec(id);

  1708.     }

  1709. 

  1710.     if (chromaHShift != 0.0)

  1711.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1712. 

  1713.     if (chromaVShift != 0.0)

  1714.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1715. 

  1716.     sws_normalizeVec(filter->chrH, 1.0);

  1717.     sws_normalizeVec(filter->chrV, 1.0);

  1718.     sws_normalizeVec(filter->lumH, 1.0);

  1719.     sws_normalizeVec(filter->lumV, 1.0);

  1720. 

  1721.     if (verbose)

  1722.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1723.     if (verbose)

  1724.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1725. 

  1726.     return filter;

  1727. }

  1728. 

  1729. SwsVector *sws_allocVec(int length)

  1730. {

  1731.     SwsVector *vec;

  1732. 

  1733.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1734.         return NULL;

  1735. 

  1736.     vec = av_malloc(sizeof(SwsVector));

  1737.     if (!vec)

  1738.         return NULL;

  1739.     vec->length = length;

  1740.     vec->coeff  = av_malloc(sizeof(double) * length);

  1741.     if (!vec->coeff)

  1742.         av_freep(&vec);

  1743.     return vec;

  1744. }

  1745. 

  1746. SwsVector *sws_getGaussianVec(double variance, double quality)

  1747. {

  1748.     const int length = (int)(variance * quality + 0.5) | 1;

  1749.     int i;

  1750.     double middle  = (length - 1) * 0.5;

  1751.     SwsVector *vec;

  1752. 

  1753.     if(variance < 0 || quality < 0)

  1754.         return NULL;

  1755. 

  1756.     vec = sws_allocVec(length);

  1757. 

  1758.     if (!vec)

  1759.         return NULL;

  1760. 

  1761.     for (i = 0; i < length; i++) {

  1762.         double dist = i - middle;

  1763.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1764.                         sqrt(2 * variance * M_PI);

  1765.     }

  1766. 

  1767.     sws_normalizeVec(vec, 1.0);

  1768. 

  1769.     return vec;

  1770. }

  1771. 

  1772. SwsVector *sws_getConstVec(double c, int length)

  1773. {

  1774.     int i;

  1775.     SwsVector *vec = sws_allocVec(length);

  1776. 

  1777.     if (!vec)

  1778.         return NULL;

  1779. 

  1780.     for (i = 0; i < length; i++)

  1781.         vec->coeff[i] = c;

  1782. 

  1783.     return vec;

  1784. }

  1785. 

  1786. SwsVector *sws_getIdentityVec(void)

  1787. {

  1788.     return sws_getConstVec(1.0, 1);

  1789. }

  1790. 

  1791. static double sws_dcVec(SwsVector *a)

  1792. {

  1793.     int i;

  1794.     double sum = 0;

  1795. 

  1796.     for (i = 0; i < a->length; i++)

  1797.         sum += a->coeff[i];

  1798. 

  1799.     return sum;

  1800. }

  1801. 

  1802. void sws_scaleVec(SwsVector *a, double scalar)

  1803. {

  1804.     int i;

  1805. 

  1806.     for (i = 0; i < a->length; i++)

  1807.         a->coeff[i] *= scalar;

  1808. }

  1809. 

  1810. void sws_normalizeVec(SwsVector *a, double height)

  1811. {

  1812.     sws_scaleVec(a, height / sws_dcVec(a));

  1813. }

  1814. 

  1815. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1816. {

  1817.     int length = a->length + b->length - 1;

  1818.     int i, j;

  1819.     SwsVector *vec = sws_getConstVec(0.0, length);

  1820. 

  1821.     if (!vec)

  1822.         return NULL;

  1823. 

  1824.     for (i = 0; i < a->length; i++) {

  1825.         for (j = 0; j < b->length; j++) {

  1826.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1827.         }

  1828.     }

  1829. 

  1830.     return vec;

  1831. }

  1832. 

  1833. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1834. {

  1835.     int length = FFMAX(a->length, b->length);

  1836.     int i;

  1837.     SwsVector *vec = sws_getConstVec(0.0, length);

  1838. 

  1839.     if (!vec)

  1840.         return NULL;

  1841. 

  1842.     for (i = 0; i < a->length; i++)

  1843.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1844.     for (i = 0; i < b->length; i++)

  1845.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1846. 

  1847.     return vec;

  1848. }

  1849. 

  1850. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1851. {

  1852.     int length = FFMAX(a->length, b->length);

  1853.     int i;

  1854.     SwsVector *vec = sws_getConstVec(0.0, length);

  1855. 

  1856.     if (!vec)

  1857.         return NULL;

  1858. 

  1859.     for (i = 0; i < a->length; i++)

  1860.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1861.     for (i = 0; i < b->length; i++)

  1862.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1863. 

  1864.     return vec;

  1865. }

  1866. 

  1867. /* shift left / or right if "shift" is negative */

  1868. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1869. {

  1870.     int length = a->length + FFABS(shift) * 2;

  1871.     int i;

  1872.     SwsVector *vec = sws_getConstVec(0.0, length);

  1873. 

  1874.     if (!vec)

  1875.         return NULL;

  1876. 

  1877.     for (i = 0; i < a->length; i++) {

  1878.         vec->coeff[i + (length    - 1) / 2 -

  1879.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1880.     }

  1881. 

  1882.     return vec;

  1883. }

  1884. 

  1885. void sws_shiftVec(SwsVector *a, int shift)

  1886. {

  1887.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1888.     av_free(a->coeff);

  1889.     a->coeff  = shifted->coeff;

  1890.     a->length = shifted->length;

  1891.     av_free(shifted);

  1892. }

  1893. 

  1894. void sws_addVec(SwsVector *a, SwsVector *b)

  1895. {

  1896.     SwsVector *sum = sws_sumVec(a, b);

  1897.     av_free(a->coeff);

  1898.     a->coeff  = sum->coeff;

  1899.     a->length = sum->length;

  1900.     av_free(sum);

  1901. }

  1902. 

  1903. void sws_subVec(SwsVector *a, SwsVector *b)

  1904. {

  1905.     SwsVector *diff = sws_diffVec(a, b);

  1906.     av_free(a->coeff);

  1907.     a->coeff  = diff->coeff;

  1908.     a->length = diff->length;

  1909.     av_free(diff);

  1910. }

  1911. 

  1912. void sws_convVec(SwsVector *a, SwsVector *b)

  1913. {

  1914.     SwsVector *conv = sws_getConvVec(a, b);

  1915.     av_free(a->coeff);

  1916.     a->coeff  = conv->coeff;

  1917.     a->length = conv->length;

  1918.     av_free(conv);

  1919. }

  1920. 

  1921. SwsVector *sws_cloneVec(SwsVector *a)

  1922. {

  1923.     SwsVector *vec = sws_allocVec(a->length);

  1924. 

  1925.     if (!vec)

  1926.         return NULL;

  1927. 

  1928.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  1929. 

  1930.     return vec;

  1931. }

  1932. 

  1933. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1934. {

  1935.     int i;

  1936.     double max = 0;

  1937.     double min = 0;

  1938.     double range;

  1939. 

  1940.     for (i = 0; i < a->length; i++)

  1941.         if (a->coeff[i] > max)

  1942.             max = a->coeff[i];

  1943. 

  1944.     for (i = 0; i < a->length; i++)

  1945.         if (a->coeff[i] < min)

  1946.             min = a->coeff[i];

  1947. 

  1948.     range = max - min;

  1949. 

  1950.     for (i = 0; i < a->length; i++) {

  1951.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1952.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1953.         for (; x > 0; x--)

  1954.             av_log(log_ctx, log_level, " ");

  1955.         av_log(log_ctx, log_level, "|\n");

  1956.     }

  1957. }

  1958. 

  1959. void sws_freeVec(SwsVector *a)

  1960. {

  1961.     if (!a)

  1962.         return;

  1963.     av_freep(&a->coeff);

  1964.     a->length = 0;

  1965.     av_free(a);

  1966. }

  1967. 

  1968. void sws_freeFilter(SwsFilter *filter)

  1969. {

  1970.     if (!filter)

  1971.         return;

  1972. 

  1973.     sws_freeVec(filter->lumH);

  1974.     sws_freeVec(filter->lumV);

  1975.     sws_freeVec(filter->chrH);

  1976.     sws_freeVec(filter->chrV);

  1977.     av_free(filter);

  1978. }

  1979. 

  1980. void sws_freeContext(SwsContext *c)

  1981. {

  1982.     int i;

  1983.     if (!c)

  1984.         return;

  1985. 

  1986.     if (c->lumPixBuf) {

  1987.         for (i = 0; i < c->vLumBufSize; i++)

  1988.             av_freep(&c->lumPixBuf[i]);

  1989.         av_freep(&c->lumPixBuf);

  1990.     }

  1991. 

  1992.     if (c->chrUPixBuf) {

  1993.         for (i = 0; i < c->vChrBufSize; i++)

  1994.             av_freep(&c->chrUPixBuf[i]);

  1995.         av_freep(&c->chrUPixBuf);

  1996.         av_freep(&c->chrVPixBuf);

  1997.     }

  1998. 

  1999.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2000.         for (i = 0; i < c->vLumBufSize; i++)

  2001.             av_freep(&c->alpPixBuf[i]);

  2002.         av_freep(&c->alpPixBuf);

  2003.     }

  2004. 

  2005.     for (i = 0; i < 4; i++)

  2006.         av_freep(&c->dither_error[i]);

  2007. 

  2008.     av_freep(&c->vLumFilter);

  2009.     av_freep(&c->vChrFilter);

  2010.     av_freep(&c->hLumFilter);

  2011.     av_freep(&c->hChrFilter);

  2012. #if HAVE_ALTIVEC

  2013.     av_freep(&c->vYCoeffsBank);

  2014.     av_freep(&c->vCCoeffsBank);

  2015. #endif

  2016. 

  2017.     av_freep(&c->vLumFilterPos);

  2018.     av_freep(&c->vChrFilterPos);

  2019.     av_freep(&c->hLumFilterPos);

  2020.     av_freep(&c->hChrFilterPos);

  2021. 

  2022. #if HAVE_MMX_INLINE

  2023. #if USE_MMAP

  2024.     if (c->lumMmxextFilterCode)

  2025.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2026.     if (c->chrMmxextFilterCode)

  2027.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2028. #elif HAVE_VIRTUALALLOC

  2029.     if (c->lumMmxextFilterCode)

  2030.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2031.     if (c->chrMmxextFilterCode)

  2032.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2033. #else

  2034.     av_free(c->lumMmxextFilterCode);

  2035.     av_free(c->chrMmxextFilterCode);

  2036. #endif

  2037.     c->lumMmxextFilterCode = NULL;

  2038.     c->chrMmxextFilterCode = NULL;

  2039. #endif /* HAVE_MMX_INLINE */

  2040. 

  2041.     av_freep(&c->yuvTable);

  2042.     av_freep(&c->formatConvBuffer);

  2043. 

  2044.     av_free(c);

  2045. }

  2046. 

  2047. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2048.                                         int srcH, enum AVPixelFormat srcFormat,

  2049.                                         int dstW, int dstH,

  2050.                                         enum AVPixelFormat dstFormat, int flags,

  2051.                                         SwsFilter *srcFilter,

  2052.                                         SwsFilter *dstFilter,

  2053.                                         const double *param)

  2054. {

  2055.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2056.                                              SWS_PARAM_DEFAULT };

  2057. 

  2058.     if (!param)

  2059.         param = default_param;

  2060. 

  2061.     if (context &&

  2062.         (context->srcW      != srcW      ||

  2063.          context->srcH      != srcH      ||

  2064.          context->srcFormat != srcFormat ||

  2065.          context->dstW      != dstW      ||

  2066.          context->dstH      != dstH      ||

  2067.          context->dstFormat != dstFormat ||

  2068.          context->flags     != flags     ||

  2069.          context->param[0]  != param[0]  ||

  2070.          context->param[1]  != param[1])) {

  2071.         sws_freeContext(context);

  2072.         context = NULL;

  2073.     }

  2074. 

  2075.     if (!context) {

  2076.         if (!(context = sws_alloc_context()))

  2077.             return NULL;

  2078.         context->srcW      = srcW;

  2079.         context->srcH      = srcH;

  2080.         context->srcFormat = srcFormat;

  2081.         context->dstW      = dstW;

  2082.         context->dstH      = dstH;

  2083.         context->dstFormat = dstFormat;

  2084.         context->flags     = flags;

  2085.         context->param[0]  = param[0];

  2086.         context->param[1]  = param[1];

  2087.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2088.             sws_freeContext(context);

  2089.             return NULL;

  2090.         }

  2091.     }

  2092.     return context;

  2093. }