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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/imgutils.h"

  46. #include "libavutil/intreadwrite.h"

  47. #include "libavutil/mathematics.h"

  48. #include "libavutil/opt.h"

  49. #include "libavutil/pixdesc.h"

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

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

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

  53. #include "rgb2rgb.h"

  54. #include "swscale.h"

  55. #include "swscale_internal.h"

  56. 

  57. static void handle_formats(SwsContext *c);

  58. 

  59. unsigned swscale_version(void)

  60. {

  61.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  62.     return LIBSWSCALE_VERSION_INT;

  63. }

  64. 

  65. const char *swscale_configuration(void)

  66. {

  67.     return FFMPEG_CONFIGURATION;

  68. }

  69. 

  70. const char *swscale_license(void)

  71. {

  72. #define LICENSE_PREFIX "libswscale license: "

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

  74. }

  75. 

  76. typedef struct FormatEntry {

  77.     uint8_t is_supported_in         :1;

  78.     uint8_t is_supported_out        :1;

  79.     uint8_t is_supported_endianness :1;

  80. } FormatEntry;

  81. 

  82. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  99.     [AV_PIX_FMT_YVYU422]     = { 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_YUV440P10LE] = { 1, 1 },

  123.     [AV_PIX_FMT_YUV440P10BE] = { 1, 1 },

  124.     [AV_PIX_FMT_YUV440P12LE] = { 1, 1 },

  125.     [AV_PIX_FMT_YUV440P12BE] = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  169.     [AV_PIX_FMT_YA8]         = { 1, 1 },

  170.     [AV_PIX_FMT_YA16BE]      = { 1, 0 },

  171.     [AV_PIX_FMT_YA16LE]      = { 1, 0 },

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

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

  174.     [AV_PIX_FMT_BGRA64BE]    = { 1, 1, 1 },

  175.     [AV_PIX_FMT_BGRA64LE]    = { 1, 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  214.     [AV_PIX_FMT_BAYER_BGGR8] = { 1, 0 },

  215.     [AV_PIX_FMT_BAYER_RGGB8] = { 1, 0 },

  216.     [AV_PIX_FMT_BAYER_GBRG8] = { 1, 0 },

  217.     [AV_PIX_FMT_BAYER_GRBG8] = { 1, 0 },

  218.     [AV_PIX_FMT_BAYER_BGGR16LE] = { 1, 0 },

  219.     [AV_PIX_FMT_BAYER_BGGR16BE] = { 1, 0 },

  220.     [AV_PIX_FMT_BAYER_RGGB16LE] = { 1, 0 },

  221.     [AV_PIX_FMT_BAYER_RGGB16BE] = { 1, 0 },

  222.     [AV_PIX_FMT_BAYER_GBRG16LE] = { 1, 0 },

  223.     [AV_PIX_FMT_BAYER_GBRG16BE] = { 1, 0 },

  224.     [AV_PIX_FMT_BAYER_GRBG16LE] = { 1, 0 },

  225.     [AV_PIX_FMT_BAYER_GRBG16BE] = { 1, 0 },

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

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

  228.     [AV_PIX_FMT_AYUV64LE]    = { 1, 1},

  229. };

  230. 

  231. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  232. {

  233.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  234.            format_entries[pix_fmt].is_supported_in : 0;

  235. }

  236. 

  237. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  238. {

  239.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  240.            format_entries[pix_fmt].is_supported_out : 0;

  241. }

  242. 

  243. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  244. {

  245.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  246.            format_entries[pix_fmt].is_supported_endianness : 0;

  247. }

  248. 

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

  250.                              double dist)

  251. {

  252.     if (dist <= 1.0)

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

  254.     else

  255.         return getSplineCoeff(0.0,

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

  257.                                c + 3.0 * d,

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

  259.                               dist - 1.0);

  260. }

  261. 

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

  263. {

  264.     if (pos == -1 || pos <= -513) {

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

  266.     }

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

  268.     return pos >> chr_subsample;

  269. }

  270. 

  271. typedef struct {

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

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

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

  275. } ScaleAlgorithm;

  276. 

  277. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  289. };

  290. 

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

  292.                               int *outFilterSize, int xInc, int srcW,

  293.                               int dstW, int filterAlign, int one,

  294.                               int flags, int cpu_flags,

  295.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  297. {

  298.     int i;

  299.     int filterSize;

  300.     int filter2Size;

  301.     int minFilterSize;

  302.     int64_t *filter    = NULL;

  303.     int64_t *filter2   = NULL;

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

  305.     int ret            = -1;

  306. 

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

  308. 

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

  310.     FF_ALLOC_ARRAY_OR_GOTO(NULL, *filterPos, (dstW + 3), sizeof(**filterPos), fail);

  311. 

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

  313.         int i;

  314.         filterSize = 1;

  315.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  317. 

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

  319.             filter[i * filterSize] = fone;

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

  321.         }

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

  323.         int i;

  324.         int64_t xDstInSrc;

  325.         filterSize = 1;

  326.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  328. 

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

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

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

  332. 

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

  334.             filter[i]       = fone;

  335.             xDstInSrc      += xInc;

  336.         }

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

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

  339.         int i;

  340.         int64_t xDstInSrc;

  341.         filterSize = 2;

  342.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  344. 

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

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

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

  348.             int j;

  349. 

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

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

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

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

  354.                 if (coeff < 0)

  355.                     coeff = 0;

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

  357.                 xx++;

  358.             }

  359.             xDstInSrc += xInc;

  360.         }

  361.     } else {

  362.         int64_t xDstInSrc;

  363.         int sizeFactor = -1;

  364. 

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

  366.             if (flags & scale_algorithms[i].flag && scale_algorithms[i].size_factor > 0) {

  367.                 sizeFactor = scale_algorithms[i].size_factor;

  368.                 break;

  369.             }

  370.         }

  371.         if (flags & SWS_LANCZOS)

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

  373.         av_assert0(sizeFactor > 0);

  374. 

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

  376.             filterSize = 1 + sizeFactor;    // upscale

  377.         else

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

  379. 

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

  381.         filterSize = FFMAX(filterSize, 1);

  382. 

  383.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  385. 

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

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

  388.             int xx = (xDstInSrc - ((int64_t)(filterSize - 2) << 16)) / (1 << 17);

  389.             int j;

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

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

  392.                 int64_t d = (FFABS(((int64_t)xx * (1 << 17)) - xDstInSrc)) << 13;

  393.                 double floatd;

  394.                 int64_t coeff;

  395. 

  396.                 if (xInc > 1 << 16)

  397.                     d = d * dstW / srcW;

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

  399. 

  400.                 if (flags & SWS_BICUBIC) {

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

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

  403. 

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

  405.                         coeff = 0.0;

  406.                     } else {

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

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

  409. 

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

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

  412.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  413.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  414.                         else

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

  416.                                       (6 * B + 30 * C) * dd  +

  417.                                     (-12 * B - 48 * C) * d   +

  418.                                       (8 * B + 24 * C) * (1 << 30);

  419.                     }

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

  421.                 }

  422. #if 0

  423.                 else if (flags & SWS_X) {

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

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

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

  427.                 }

  428. #endif

  429.                 else if (flags & SWS_X) {

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

  431.                     double c;

  432. 

  433.                     if (floatd < 1.0)

  434.                         c = cos(floatd * M_PI);

  435.                     else

  436.                         c = -1.0;

  437.                     if (c < 0.0)

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

  439.                     else

  440.                         c = pow(c, A);

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

  442.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  448.                     else

  449.                         coeff = 0.0;

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

  451.                 } else if (flags & SWS_GAUSS) {

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

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

  454.                 } else if (flags & SWS_SINC) {

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

  456.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  460.                     if (floatd > p)

  461.                         coeff = 0;

  462.                 } else if (flags & SWS_BILINEAR) {

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

  464.                     if (coeff < 0)

  465.                         coeff = 0;

  466.                     coeff *= fone >> 30;

  467.                 } else if (flags & SWS_SPLINE) {

  468.                     double p = -2.196152422706632;

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

  470.                 } else {

  471.                     av_assert0(0);

  472.                 }

  473. 

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

  475.                 xx++;

  476.             }

  477.             xDstInSrc += 2 * xInc;

  478.         }

  479.     }

  480. 

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

  482.      * av_free(filter);

  483.      */

  484.     av_assert0(filterSize > 0);

  485.     filter2Size = filterSize;

  486.     if (srcFilter)

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

  488.     if (dstFilter)

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

  490.     av_assert0(filter2Size > 0);

  491.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter2, dstW, filter2Size * sizeof(*filter2), fail);

  492. 

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

  494.         int j, k;

  495. 

  496.         if (srcFilter) {

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

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

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

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

  501.             }

  502.         } else {

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

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

  505.         }

  506.         // FIXME dstFilter

  507. 

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

  509.     }

  510.     av_freep(&filter);

  511. 

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

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

  514.     minFilterSize = 0;

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

  516.         int min = filter2Size;

  517.         int j;

  518.         int64_t cutOff = 0.0;

  519. 

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

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

  522.             int k;

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

  524. 

  525.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  526.                 break;

  527. 

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

  529.              * filter otherwise */

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

  531.                 break;

  532. 

  533.             // move filter coefficients left

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

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

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

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

  538.         }

  539. 

  540.         cutOff = 0;

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

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

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

  544. 

  545.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  546.                 break;

  547.             min--;

  548.         }

  549. 

  550.         if (min > minFilterSize)

  551.             minFilterSize = min;

  552.     }

  553. 

  554.     if (PPC_ALTIVEC(cpu_flags)) {

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

  556.         if (minFilterSize < 5)

  557.             filterAlign = 4;

  558. 

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

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

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

  562.         if (minFilterSize < 3)

  563.             filterAlign = 1;

  564.     }

  565. 

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

  567.         // special case for unscaled vertical filtering

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

  569.             filterAlign = 1;

  570.     }

  571. 

  572.     av_assert0(minFilterSize > 0);

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

  574.     av_assert0(filterSize > 0);

  575.     filter = av_malloc_array(dstW, filterSize * sizeof(*filter));

  576.     if (!filter)

  577.         goto fail;

  578.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  579.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16)) {

  580.         ret = RETCODE_USE_CASCADE;

  581.         goto fail;

  582.     }

  583.     *outFilterSize = filterSize;

  584. 

  585.     if (flags & SWS_PRINT_INFO)

  586.         av_log(NULL, AV_LOG_VERBOSE,

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

  588.                filter2Size, filterSize);

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

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

  591.         int j;

  592. 

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

  594.             if (j >= filter2Size)

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

  596.             else

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

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

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

  600.         }

  601.     }

  602. 

  603.     // FIXME try to align filterPos if possible

  604. 

  605.     // fix borders

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

  607.         int j;

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

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

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

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

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

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

  614.             }

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

  616.         }

  617. 

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

  619.             int shift = (*filterPos)[i] + FFMIN(filterSize - srcW, 0);

  620.             int64_t acc = 0;

  621. 

  622.             for (j = filterSize - 1; j >= 0; j--) {

  623.                 if ((*filterPos)[i] + j >= srcW) {

  624.                     acc += filter[i * filterSize + j];

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

  626.                 }

  627.             }

  628.             for (j = filterSize - 1; j >= 0; j--) {

  629.                 if (j < shift) {

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

  631.                 } else {

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

  633.                 }

  634.             }

  635. 

  636.             (*filterPos)[i]-= shift;

  637.             filter[i * filterSize + srcW - 1 - (*filterPos)[i]] += acc;

  638.         }

  639.         av_assert0((*filterPos)[i] >= 0);

  640.         av_assert0((*filterPos)[i] < srcW);

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

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

  643.                 av_assert0((*filterPos)[i] + j < srcW || !filter[i * filterSize + j]);

  644.             }

  645.         }

  646.     }

  647. 

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

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

  650.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  652. 

  653.     /* normalize & store in outFilter */

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

  655.         int j;

  656.         int64_t error = 0;

  657.         int64_t sum   = 0;

  658. 

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

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

  661.         }

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

  663.         if (!sum) {

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

  665.             sum = 1;

  666.         }

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

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

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

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

  671.             error                                  = v - intV * sum;

  672.         }

  673.     }

  674. 

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

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

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

  678.                                                       * read over the end */

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

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

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

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

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

  684.     }

  685. 

  686.     ret = 0;

  687. 

  688. fail:

  689.     if(ret < 0)

  690.         av_log(NULL, ret == RETCODE_USE_CASCADE ? AV_LOG_DEBUG : AV_LOG_ERROR, "sws: initFilter failed\n");

  691.     av_free(filter);

  692.     av_free(filter2);

  693.     return ret;

  694. }

  695. 

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

  697. {

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

  699.     int64_t vr =  table[0];

  700.     int64_t ub =  table[1];

  701.     int64_t ug = -table[2];

  702.     int64_t vg = -table[3];

  703.     int64_t ONE = 65536;

  704.     int64_t cy = ONE;

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

  706.     int i;

  707.     static const int8_t map[] = {

  708.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  709.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  710.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  711.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  712.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  713.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  714.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  715.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  716.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  717.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  718.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  719.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  720.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  721.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  722.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  723.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  724.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  725.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  726.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  727.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  728.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  729.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  730.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  731.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  732.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  733.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  734.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  735.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  736.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  737.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  738.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  739.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  743.     };

  744. 

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

  746. 

  747.     if (!dstRange) {

  748.         cy = cy * 255 / 219;

  749.     } else {

  750.         vr = vr * 224 / 255;

  751.         ub = ub * 224 / 255;

  752.         ug = ug * 224 / 255;

  753.         vg = vg * 224 / 255;

  754.     }

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

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

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

  758. 

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

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

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

  762. 

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

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

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

  766. 

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

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

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

  770. 

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

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

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

  774. 

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

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

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

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

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

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

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

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

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

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

  785.     }

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

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

  788. }

  789. 

  790. static void fill_xyztables(struct SwsContext *c)

  791. {

  792.     int i;

  793.     double xyzgamma = XYZ_GAMMA;

  794.     double rgbgamma = 1.0 / RGB_GAMMA;

  795.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  796.     double rgbgammainv = RGB_GAMMA;

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

  798.         {13270, -6295, -2041},

  799.         {-3969,  7682,   170},

  800.         {  228,  -835,  4329} };

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

  802.         {1689, 1464,  739},

  803.         { 871, 2929,  296},

  804.         {  79,  488, 3891} };

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

  806. 

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

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

  809.     c->xyzgamma = xyzgamma_tab;

  810.     c->rgbgamma = rgbgamma_tab;

  811.     c->xyzgammainv = xyzgammainv_tab;

  812.     c->rgbgammainv = rgbgammainv_tab;

  813. 

  814.     if (rgbgamma_tab[4095])

  815.         return;

  816. 

  817.     /* set gamma vectors */

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

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

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

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

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

  823.     }

  824. }

  825. 

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

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

  828.                              int brightness, int contrast, int saturation)

  829. {

  830.     const AVPixFmtDescriptor *desc_dst;

  831.     const AVPixFmtDescriptor *desc_src;

  832.     int need_reinit = 0;

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

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

  835. 

  836.     handle_formats(c);

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

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

  839. 

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

  841.         dstRange = 0;

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

  843.         srcRange = 0;

  844. 

  845.     c->brightness = brightness;

  846.     c->contrast   = contrast;

  847.     c->saturation = saturation;

  848.     if (c->srcRange != srcRange || c->dstRange != dstRange)

  849.         need_reinit = 1;

  850.     c->srcRange   = srcRange;

  851.     c->dstRange   = dstRange;

  852. 

  853.     //The srcBpc check is possibly wrong but we seem to lack a definitive reference to test this

  854.     //and what we have in ticket 2939 looks better with this check

  855.     if (need_reinit && (c->srcBpc == 8 || !isYUV(c->srcFormat)))

  856.         ff_sws_init_range_convert(c);

  857. 

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

  859.         return -1;

  860. 

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

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

  863. 

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

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

  866.                                  contrast, saturation);

  867.         // FIXME factorize

  868. 

  869.         if (ARCH_PPC)

  870.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  871.                                        contrast, saturation);

  872.     }

  873. 

  874.     fill_rgb2yuv_table(c, table, dstRange);

  875. 

  876.     return 0;

  877. }

  878. 

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

  880.                              int *srcRange, int **table, int *dstRange,

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

  882. {

  883.     if (!c )

  884.         return -1;

  885. 

  886.     *inv_table  = c->srcColorspaceTable;

  887.     *table      = c->dstColorspaceTable;

  888.     *srcRange   = c->srcRange;

  889.     *dstRange   = c->dstRange;

  890.     *brightness = c->brightness;

  891.     *contrast   = c->contrast;

  892.     *saturation = c->saturation;

  893. 

  894.     return 0;

  895. }

  896. 

  897. static int handle_jpeg(enum AVPixelFormat *format)

  898. {

  899.     switch (*format) {

  900.     case AV_PIX_FMT_YUVJ420P:

  901.         *format = AV_PIX_FMT_YUV420P;

  902.         return 1;

  903.     case AV_PIX_FMT_YUVJ411P:

  904.         *format = AV_PIX_FMT_YUV411P;

  905.         return 1;

  906.     case AV_PIX_FMT_YUVJ422P:

  907.         *format = AV_PIX_FMT_YUV422P;

  908.         return 1;

  909.     case AV_PIX_FMT_YUVJ444P:

  910.         *format = AV_PIX_FMT_YUV444P;

  911.         return 1;

  912.     case AV_PIX_FMT_YUVJ440P:

  913.         *format = AV_PIX_FMT_YUV440P;

  914.         return 1;

  915.     case AV_PIX_FMT_GRAY8:

  916.     case AV_PIX_FMT_GRAY16LE:

  917.     case AV_PIX_FMT_GRAY16BE:

  918.         return 1;

  919.     default:

  920.         return 0;

  921.     }

  922. }

  923. 

  924. static int handle_0alpha(enum AVPixelFormat *format)

  925. {

  926.     switch (*format) {

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

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

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

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

  931.     default:                                          return 0;

  932.     }

  933. }

  934. 

  935. static int handle_xyz(enum AVPixelFormat *format)

  936. {

  937.     switch (*format) {

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

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

  940.     default:                                                return 0;

  941.     }

  942. }

  943. 

  944. static void handle_formats(SwsContext *c)

  945. {

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

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

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

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

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

  951.         fill_xyztables(c);

  952. }

  953. 

  954. SwsContext *sws_alloc_context(void)

  955. {

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

  957. 

  958.     av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));

  959. 

  960.     if (c) {

  961.         c->av_class = &sws_context_class;

  962.         av_opt_set_defaults(c);

  963.     }

  964. 

  965.     return c;

  966. }

  967. 

  968. static uint16_t * alloc_gamma_tbl(double e)

  969. {

  970.     int i = 0;

  971.     uint16_t * tbl;

  972.     tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);

  973.     if (!tbl)

  974.         return NULL;

  975. 

  976.     for (i = 0; i < 65536; ++i) {

  977.         tbl[i] = pow(i / 65535.0, e) * 65535.0;

  978.     }

  979.     return tbl;

  980. }

  981. 

  982. static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)

  983. {

  984.     switch(fmt) {

  985.     case AV_PIX_FMT_ARGB:       return AV_PIX_FMT_RGB24;

  986.     case AV_PIX_FMT_RGBA:       return AV_PIX_FMT_RGB24;

  987.     case AV_PIX_FMT_ABGR:       return AV_PIX_FMT_BGR24;

  988.     case AV_PIX_FMT_BGRA:       return AV_PIX_FMT_BGR24;

  989.     case AV_PIX_FMT_YA8:        return AV_PIX_FMT_GRAY8;

  990. 

  991.     case AV_PIX_FMT_YUVA420P:   return AV_PIX_FMT_YUV420P;

  992.     case AV_PIX_FMT_YUVA422P:   return AV_PIX_FMT_YUV422P;

  993.     case AV_PIX_FMT_YUVA444P:           return AV_PIX_FMT_YUV444P;

  994. 

  995.     case AV_PIX_FMT_GBRAP:              return AV_PIX_FMT_GBRP;

  996. 

  997.     case AV_PIX_FMT_GBRAP16LE:          return AV_PIX_FMT_GBRP16;

  998.     case AV_PIX_FMT_GBRAP16BE:          return AV_PIX_FMT_GBRP16;

  999. 

  1000.     case AV_PIX_FMT_RGBA64LE:   return AV_PIX_FMT_RGB48;

  1001.     case AV_PIX_FMT_RGBA64BE:   return AV_PIX_FMT_RGB48;

  1002.     case AV_PIX_FMT_BGRA64LE:   return AV_PIX_FMT_BGR48;

  1003.     case AV_PIX_FMT_BGRA64BE:   return AV_PIX_FMT_BGR48;

  1004. 

  1005.     case AV_PIX_FMT_YA16BE:             return AV_PIX_FMT_GRAY16;

  1006.     case AV_PIX_FMT_YA16LE:             return AV_PIX_FMT_GRAY16;

  1007. 

  1008.     case AV_PIX_FMT_YUVA420P9BE:        return AV_PIX_FMT_YUV420P9;

  1009.     case AV_PIX_FMT_YUVA422P9BE:        return AV_PIX_FMT_YUV422P9;

  1010.     case AV_PIX_FMT_YUVA444P9BE:        return AV_PIX_FMT_YUV444P9;

  1011.     case AV_PIX_FMT_YUVA420P9LE:        return AV_PIX_FMT_YUV420P9;

  1012.     case AV_PIX_FMT_YUVA422P9LE:        return AV_PIX_FMT_YUV422P9;

  1013.     case AV_PIX_FMT_YUVA444P9LE:        return AV_PIX_FMT_YUV444P9;

  1014.     case AV_PIX_FMT_YUVA420P10BE:       return AV_PIX_FMT_YUV420P10;

  1015.     case AV_PIX_FMT_YUVA422P10BE:       return AV_PIX_FMT_YUV422P10;

  1016.     case AV_PIX_FMT_YUVA444P10BE:       return AV_PIX_FMT_YUV444P10;

  1017.     case AV_PIX_FMT_YUVA420P10LE:       return AV_PIX_FMT_YUV420P10;

  1018.     case AV_PIX_FMT_YUVA422P10LE:       return AV_PIX_FMT_YUV422P10;

  1019.     case AV_PIX_FMT_YUVA444P10LE:       return AV_PIX_FMT_YUV444P10;

  1020.     case AV_PIX_FMT_YUVA420P16BE:       return AV_PIX_FMT_YUV420P16;

  1021.     case AV_PIX_FMT_YUVA422P16BE:       return AV_PIX_FMT_YUV422P16;

  1022.     case AV_PIX_FMT_YUVA444P16BE:       return AV_PIX_FMT_YUV444P16;

  1023.     case AV_PIX_FMT_YUVA420P16LE:       return AV_PIX_FMT_YUV420P16;

  1024.     case AV_PIX_FMT_YUVA422P16LE:       return AV_PIX_FMT_YUV422P16;

  1025.     case AV_PIX_FMT_YUVA444P16LE:       return AV_PIX_FMT_YUV444P16;

  1026. 

  1027. //     case AV_PIX_FMT_AYUV64LE:

  1028. //     case AV_PIX_FMT_AYUV64BE:

  1029. //     case AV_PIX_FMT_PAL8:

  1030.     default: return AV_PIX_FMT_NONE;

  1031.     }

  1032. }

  1033. 

  1034. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1035.                              SwsFilter *dstFilter)

  1036. {

  1037.     int i, j;

  1038.     int usesVFilter, usesHFilter;

  1039.     int unscaled;

  1040.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1041.     int srcW              = c->srcW;

  1042.     int srcH              = c->srcH;

  1043.     int dstW              = c->dstW;

  1044.     int dstH              = c->dstH;

  1045.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1046.     int flags, cpu_flags;

  1047.     enum AVPixelFormat srcFormat = c->srcFormat;

  1048.     enum AVPixelFormat dstFormat = c->dstFormat;

  1049.     const AVPixFmtDescriptor *desc_src;

  1050.     const AVPixFmtDescriptor *desc_dst;

  1051.     int ret = 0;

  1052.     enum AVPixelFormat tmpFmt;

  1053. 

  1054.     cpu_flags = av_get_cpu_flags();

  1055.     flags     = c->flags;

  1056.     emms_c();

  1057.     if (!rgb15to16)

  1058.         sws_rgb2rgb_init();

  1059. 

  1060.     unscaled = (srcW == dstW && srcH == dstH);

  1061. 

  1062.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1063.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1064. 

  1065.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1066.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1067. 

  1068.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1069.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1070.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1071.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1072. 

  1073.     handle_formats(c);

  1074.     srcFormat = c->srcFormat;

  1075.     dstFormat = c->dstFormat;

  1076.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1077.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1078. 

  1079.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1080.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1081.     if (!sws_isSupportedInput(srcFormat)) {

  1082.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1083.                av_get_pix_fmt_name(srcFormat));

  1084.         return AVERROR(EINVAL);

  1085.     }

  1086.     if (!sws_isSupportedOutput(dstFormat)) {

  1087.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1088.                av_get_pix_fmt_name(dstFormat));

  1089.         return AVERROR(EINVAL);

  1090.     }

  1091.     }

  1092.     av_assert2(desc_src && desc_dst);

  1093. 

  1094.     i = flags & (SWS_POINT         |

  1095.                  SWS_AREA          |

  1096.                  SWS_BILINEAR      |

  1097.                  SWS_FAST_BILINEAR |

  1098.                  SWS_BICUBIC       |

  1099.                  SWS_X             |

  1100.                  SWS_GAUSS         |

  1101.                  SWS_LANCZOS       |

  1102.                  SWS_SINC          |

  1103.                  SWS_SPLINE        |

  1104.                  SWS_BICUBLIN);

  1105. 

  1106.     /* provide a default scaler if not set by caller */

  1107.     if (!i) {

  1108.         if (dstW < srcW && dstH < srcH)

  1109.             flags |= SWS_BICUBIC;

  1110.         else if (dstW > srcW && dstH > srcH)

  1111.             flags |= SWS_BICUBIC;

  1112.         else

  1113.             flags |= SWS_BICUBIC;

  1114.         c->flags = flags;

  1115.     } else if (i & (i - 1)) {

  1116.         av_log(c, AV_LOG_ERROR,

  1117.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1118.         return AVERROR(EINVAL);

  1119.     }

  1120.     /* sanity check */

  1121.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1122.         /* FIXME check if these are enough and try to lower them after

  1123.          * fixing the relevant parts of the code */

  1124.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1125.                srcW, srcH, dstW, dstH);

  1126.         return AVERROR(EINVAL);

  1127.     }

  1128. 

  1129.     if (!dstFilter)

  1130.         dstFilter = &dummyFilter;

  1131.     if (!srcFilter)

  1132.         srcFilter = &dummyFilter;

  1133. 

  1134.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1135.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1136.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1137.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1138.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1139. 

  1140.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1141.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1142.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1143.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1144.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1145.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1146.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1147.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1148. 

  1149.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1150.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1151. 

  1152.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1153.         if (dstW&1) {

  1154.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1155.             flags |= SWS_FULL_CHR_H_INT;

  1156.             c->flags = flags;

  1157.         }

  1158. 

  1159.         if (   c->chrSrcHSubSample == 0

  1160.             && c->chrSrcVSubSample == 0

  1161.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1162.             && !(c->flags & SWS_FAST_BILINEAR)

  1163.         ) {

  1164.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1165.             flags |= SWS_FULL_CHR_H_INT;

  1166.             c->flags = flags;

  1167.         }

  1168.     }

  1169. 

  1170.     if (c->dither == SWS_DITHER_AUTO) {

  1171.         if (flags & SWS_ERROR_DIFFUSION)

  1172.             c->dither = SWS_DITHER_ED;

  1173.     }

  1174. 

  1175.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1176.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1177.        dstFormat == AV_PIX_FMT_BGR8 ||

  1178.        dstFormat == AV_PIX_FMT_RGB8) {

  1179.         if (c->dither == SWS_DITHER_AUTO)

  1180.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1181.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1182.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1183.                 av_log(c, AV_LOG_DEBUG,

  1184.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1185.                     av_get_pix_fmt_name(dstFormat));

  1186.                 flags   |= SWS_FULL_CHR_H_INT;

  1187.                 c->flags = flags;

  1188.             }

  1189.         }

  1190.         if (flags & SWS_FULL_CHR_H_INT) {

  1191.             if (c->dither == SWS_DITHER_BAYER) {

  1192.                 av_log(c, AV_LOG_DEBUG,

  1193.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1194.                     av_get_pix_fmt_name(dstFormat));

  1195.                 c->dither = SWS_DITHER_ED;

  1196.             }

  1197.         }

  1198.     }

  1199.     if (isPlanarRGB(dstFormat)) {

  1200.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1201.             av_log(c, AV_LOG_DEBUG,

  1202.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1203.                    av_get_pix_fmt_name(dstFormat));

  1204.             flags   |= SWS_FULL_CHR_H_INT;

  1205.             c->flags = flags;

  1206.         }

  1207.     }

  1208. 

  1209.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1210.      * chroma interpolation */

  1211.     if (flags & SWS_FULL_CHR_H_INT &&

  1212.         isAnyRGB(dstFormat)        &&

  1213.         !isPlanarRGB(dstFormat)    &&

  1214.         dstFormat != AV_PIX_FMT_RGBA64LE &&

  1215.         dstFormat != AV_PIX_FMT_RGBA64BE &&

  1216.         dstFormat != AV_PIX_FMT_BGRA64LE &&

  1217.         dstFormat != AV_PIX_FMT_BGRA64BE &&

  1218.         dstFormat != AV_PIX_FMT_RGB48LE &&

  1219.         dstFormat != AV_PIX_FMT_RGB48BE &&

  1220.         dstFormat != AV_PIX_FMT_BGR48LE &&

  1221.         dstFormat != AV_PIX_FMT_BGR48BE &&

  1222.         dstFormat != AV_PIX_FMT_RGBA  &&

  1223.         dstFormat != AV_PIX_FMT_ARGB  &&

  1224.         dstFormat != AV_PIX_FMT_BGRA  &&

  1225.         dstFormat != AV_PIX_FMT_ABGR  &&

  1226.         dstFormat != AV_PIX_FMT_RGB24 &&

  1227.         dstFormat != AV_PIX_FMT_BGR24 &&

  1228.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1229.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1230.         dstFormat != AV_PIX_FMT_BGR8 &&

  1231.         dstFormat != AV_PIX_FMT_RGB8

  1232.     ) {

  1233.         av_log(c, AV_LOG_WARNING,

  1234.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1235.                av_get_pix_fmt_name(dstFormat));

  1236.         flags   &= ~SWS_FULL_CHR_H_INT;

  1237.         c->flags = flags;

  1238.     }

  1239.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1240.         c->chrDstHSubSample = 1;

  1241. 

  1242.     // drop some chroma lines if the user wants it

  1243.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1244.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1245.     c->chrSrcVSubSample += c->vChrDrop;

  1246. 

  1247.     /* drop every other pixel for chroma calculation unless user

  1248.      * wants full chroma */

  1249.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1250.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1251.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1252.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1253.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1254.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1255.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1256.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1257.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1258.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1259.          (flags & SWS_FAST_BILINEAR)))

  1260.         c->chrSrcHSubSample = 1;

  1261. 

  1262.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1263.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1264.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1265.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1266.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1267. 

  1268.     FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1269. 

  1270.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1271.     if (c->srcBpc < 8)

  1272.         c->srcBpc = 8;

  1273.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1274.     if (c->dstBpc < 8)

  1275.         c->dstBpc = 8;

  1276.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1277.         c->srcBpc = 16;

  1278.     if (c->dstBpc == 16)

  1279.         dst_stride <<= 1;

  1280. 

  1281.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1282.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1283.                              c->chrDstW >= c->chrSrcW &&

  1284.                              (srcW & 15) == 0;

  1285.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1286. 

  1287.             && (flags & SWS_FAST_BILINEAR)) {

  1288.             if (flags & SWS_PRINT_INFO)

  1289.                 av_log(c, AV_LOG_INFO,

  1290.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1291.         }

  1292.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1293.             c->canMMXEXTBeUsed = 0;

  1294.     } else

  1295.         c->canMMXEXTBeUsed = 0;

  1296. 

  1297.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1298.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1299. 

  1300.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1301.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1302.      * correct scaling.

  1303.      * n-2 is the last chrominance sample available.

  1304.      * This is not perfect, but no one should notice the difference, the more

  1305.      * correct variant would be like the vertical one, but that would require

  1306.      * some special code for the first and last pixel */

  1307.     if (flags & SWS_FAST_BILINEAR) {

  1308.         if (c->canMMXEXTBeUsed) {

  1309.             c->lumXInc += 20;

  1310.             c->chrXInc += 20;

  1311.         }

  1312.         // we don't use the x86 asm scaler if MMX is available

  1313.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1314.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1315.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1316.         }

  1317.     }

  1318. 

  1319.     // hardcoded for now

  1320.     c->gamma_value = 2.2;

  1321.     tmpFmt = AV_PIX_FMT_RGBA64LE;

  1322. 

  1323. 

  1324.     if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {

  1325.         SwsContext *c2;

  1326.         c->cascaded_context[0] = NULL;

  1327. 

  1328.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1329.                             srcW, srcH, tmpFmt, 64);

  1330.         if (ret < 0)

  1331.             return ret;

  1332. 

  1333.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1334.                                                 srcW, srcH, tmpFmt,

  1335.                                                 flags, NULL, NULL, c->param);

  1336.         if (!c->cascaded_context[0]) {

  1337.             return -1;

  1338.         }

  1339. 

  1340.         c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,

  1341.                                                 dstW, dstH, tmpFmt,

  1342.                                                 flags, srcFilter, dstFilter, c->param);

  1343. 

  1344.         if (!c->cascaded_context[1])

  1345.             return -1;

  1346. 

  1347.         c2 = c->cascaded_context[1];

  1348.         c2->is_internal_gamma = 1;

  1349.         c2->gamma     = alloc_gamma_tbl(    c->gamma_value);

  1350.         c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);

  1351.         if (!c2->gamma || !c2->inv_gamma)

  1352.             return AVERROR(ENOMEM);

  1353. 

  1354.         c->cascaded_context[2] = NULL;

  1355.         if (dstFormat != tmpFmt) {

  1356.             ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,

  1357.                                 dstW, dstH, tmpFmt, 64);

  1358.             if (ret < 0)

  1359.                 return ret;

  1360. 

  1361.             c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,

  1362.                                                 dstW, dstH, dstFormat,

  1363.                                                 flags, NULL, NULL, c->param);

  1364.             if (!c->cascaded_context[2])

  1365.                 return -1;

  1366.         }

  1367.         return 0;

  1368.     }

  1369. 

  1370.     if (isBayer(srcFormat)) {

  1371.         if (!unscaled ||

  1372.             (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {

  1373.             enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;

  1374. 

  1375.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1376.                                 srcW, srcH, tmpFormat, 64);

  1377.             if (ret < 0)

  1378.                 return ret;

  1379. 

  1380.             c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1381.                                                     srcW, srcH, tmpFormat,

  1382.                                                     flags, srcFilter, NULL, c->param);

  1383.             if (!c->cascaded_context[0])

  1384.                 return -1;

  1385. 

  1386.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1387.                                                     dstW, dstH, dstFormat,

  1388.                                                     flags, NULL, dstFilter, c->param);

  1389.             if (!c->cascaded_context[1])

  1390.                 return -1;

  1391.             return 0;

  1392.         }

  1393.     }

  1394. 

  1395.     if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {

  1396.         enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);

  1397. 

  1398.         if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)

  1399.         if (!unscaled ||

  1400.             dstFormat != tmpFormat ||

  1401.             usesHFilter || usesVFilter ||

  1402.             c->srcRange != c->dstRange

  1403.         ) {

  1404.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1405.                                 srcW, srcH, tmpFormat, 64);

  1406.             if (ret < 0)

  1407.                 return ret;

  1408. 

  1409.             c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1410.                                                         srcW, srcH, tmpFormat,

  1411.                                                         flags, c->param);

  1412.             if (!c->cascaded_context[0])

  1413.                 return -1;

  1414.             c->cascaded_context[0]->alphablend = c->alphablend;

  1415.             ret = sws_init_context(c->cascaded_context[0], NULL , NULL);

  1416.             if (ret < 0)

  1417.                 return ret;

  1418. 

  1419.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1420.                                                     dstW, dstH, dstFormat,

  1421.                                                     flags, srcFilter, dstFilter, c->param);

  1422.             if (!c->cascaded_context[1])

  1423.                 return -1;

  1424.             return 0;

  1425.         }

  1426.     }

  1427. 

  1428. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1429. 

  1430.     /* precalculate horizontal scaler filter coefficients */

  1431.     {

  1432. #if HAVE_MMXEXT_INLINE

  1433. // can't downscale !!!

  1434.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1435.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1436.                                                              NULL, NULL, 8);

  1437.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1438.                                                              NULL, NULL, NULL, 4);

  1439. 

  1440. #if USE_MMAP

  1441.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1442.                                           PROT_READ | PROT_WRITE,

  1443.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1444.                                           -1, 0);

  1445.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1446.                                           PROT_READ | PROT_WRITE,

  1447.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1448.                                           -1, 0);

  1449. #elif HAVE_VIRTUALALLOC

  1450.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1451.                                                   c->lumMmxextFilterCodeSize,

  1452.                                                   MEM_COMMIT,

  1453.                                                   PAGE_EXECUTE_READWRITE);

  1454.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1455.                                                   c->chrMmxextFilterCodeSize,

  1456.                                                   MEM_COMMIT,

  1457.                                                   PAGE_EXECUTE_READWRITE);

  1458. #else

  1459.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1460.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1461. #endif

  1462. 

  1463. #ifdef MAP_ANONYMOUS

  1464.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1465. #else

  1466.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1467. #endif

  1468.             {

  1469.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1470.                 return AVERROR(ENOMEM);

  1471.             }

  1472. 

  1473.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1474.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1475.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1476.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1477. 

  1478.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1479.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1480.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1481.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1482. 

  1483. #if USE_MMAP

  1484.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1485.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1486.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1487.                 goto fail;

  1488.             }

  1489. #endif

  1490.         } else

  1491. #endif /* HAVE_MMXEXT_INLINE */

  1492.         {

  1493.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1494.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1495. 

  1496.             if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1497.                            &c->hLumFilterSize, c->lumXInc,

  1498.                            srcW, dstW, filterAlign, 1 << 14,

  1499.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1500.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1501.                            c->param,

  1502.                            get_local_pos(c, 0, 0, 0),

  1503.                            get_local_pos(c, 0, 0, 0))) < 0)

  1504.                 goto fail;

  1505.             if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1506.                            &c->hChrFilterSize, c->chrXInc,

  1507.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1508.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1509.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1510.                            c->param,

  1511.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1512.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)

  1513.                 goto fail;

  1514.         }

  1515.     } // initialize horizontal stuff

  1516. 

  1517.     /* precalculate vertical scaler filter coefficients */

  1518.     {

  1519.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1520.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1521. 

  1522.         if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1523.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1524.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1525.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1526.                        c->param,

  1527.                        get_local_pos(c, 0, 0, 1),

  1528.                        get_local_pos(c, 0, 0, 1))) < 0)

  1529.             goto fail;

  1530.         if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1531.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1532.                        filterAlign, (1 << 12),

  1533.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1534.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1535.                        c->param,

  1536.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1537.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)

  1538. 

  1539.             goto fail;

  1540. 

  1541. #if HAVE_ALTIVEC

  1542.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1543.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1544. 

  1545.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1546.             int j;

  1547.             short *p = (short *)&c->vYCoeffsBank[i];

  1548.             for (j = 0; j < 8; j++)

  1549.                 p[j] = c->vLumFilter[i];

  1550.         }

  1551. 

  1552.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1553.             int j;

  1554.             short *p = (short *)&c->vCCoeffsBank[i];

  1555.             for (j = 0; j < 8; j++)

  1556.                 p[j] = c->vChrFilter[i];

  1557.         }

  1558. #endif

  1559.     }

  1560. 

  1561.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1562.     c->vLumBufSize = c->vLumFilterSize;

  1563.     c->vChrBufSize = c->vChrFilterSize;

  1564.     for (i = 0; i < dstH; i++) {

  1565.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1566.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1567.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1568.                                << c->chrSrcVSubSample));

  1569. 

  1570.         nextSlice >>= c->chrSrcVSubSample;

  1571.         nextSlice <<= c->chrSrcVSubSample;

  1572.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1573.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1574.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1575.             (nextSlice >> c->chrSrcVSubSample))

  1576.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1577.                              c->vChrFilterPos[chrI];

  1578.     }

  1579. 

  1580.     for (i = 0; i < 4; i++)

  1581.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1582. 

  1583.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1584.      * need to allocate several megabytes to handle all possible cases) */

  1585.     FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1586.     FF_ALLOCZ_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1587.     FF_ALLOCZ_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1588.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1589.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1590.     /* Note we need at least one pixel more at the end because of the MMX code

  1591.      * (just in case someone wants to replace the 4000/8000). */

  1592.     /* align at 16 bytes for AltiVec */

  1593.     for (i = 0; i < c->vLumBufSize; i++) {

  1594.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1595.                           dst_stride + 16, fail);

  1596.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1597.     }

  1598.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1599.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1600.     c->uv_offx2 = dst_stride + 16;

  1601.     for (i = 0; i < c->vChrBufSize; i++) {

  1602.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1603.                          dst_stride * 2 + 32, fail);

  1604.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1605.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1606.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1607.     }

  1608.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1609.         for (i = 0; i < c->vLumBufSize; i++) {

  1610.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1611.                               dst_stride + 16, fail);

  1612.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1613.         }

  1614. 

  1615.     // try to avoid drawing green stuff between the right end and the stride end

  1616.     for (i = 0; i < c->vChrBufSize; i++)

  1617.         if(desc_dst->comp[0].depth_minus1 == 15){

  1618.             av_assert0(c->dstBpc > 14);

  1619.             for(j=0; j<dst_stride/2+1; j++)

  1620.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1621.         } else

  1622.             for(j=0; j<dst_stride+1; j++)

  1623.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1624. 

  1625.     av_assert0(c->chrDstH <= dstH);

  1626. 

  1627.     if (flags & SWS_PRINT_INFO) {

  1628.         const char *scaler = NULL, *cpucaps;

  1629. 

  1630.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1631.             if (flags & scale_algorithms[i].flag) {

  1632.                 scaler = scale_algorithms[i].description;

  1633.                 break;

  1634.             }

  1635.         }

  1636.         if (!scaler)

  1637.             scaler =  "ehh flags invalid?!";

  1638.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1639.                scaler,

  1640.                av_get_pix_fmt_name(srcFormat),

  1641. #ifdef DITHER1XBPP

  1642.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1643.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1644.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1645.                                                              "dithered " : "",

  1646. #else

  1647.                "",

  1648. #endif

  1649.                av_get_pix_fmt_name(dstFormat));

  1650. 

  1651.         if (INLINE_MMXEXT(cpu_flags))

  1652.             cpucaps = "MMXEXT";

  1653.         else if (INLINE_AMD3DNOW(cpu_flags))

  1654.             cpucaps = "3DNOW";

  1655.         else if (INLINE_MMX(cpu_flags))

  1656.             cpucaps = "MMX";

  1657.         else if (PPC_ALTIVEC(cpu_flags))

  1658.             cpucaps = "AltiVec";

  1659.         else

  1660.             cpucaps = "C";

  1661. 

  1662.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1663. 

  1664.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1665.         av_log(c, AV_LOG_DEBUG,

  1666.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1667.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1668.         av_log(c, AV_LOG_DEBUG,

  1669.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1670.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1671.                c->chrXInc, c->chrYInc);

  1672.     }

  1673. 

  1674.     /* alpha blend special case, note this has been split via cascaded contexts if its scaled */

  1675.     if (unscaled && !usesHFilter && !usesVFilter &&

  1676.         c->alphablend != SWS_ALPHA_BLEND_NONE &&

  1677.         isALPHA(srcFormat) &&

  1678.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&

  1679.         alphaless_fmt(srcFormat) == dstFormat

  1680.     ) {

  1681.         c->swscale = ff_sws_alphablendaway;

  1682. 

  1683.         if (flags & SWS_PRINT_INFO)

  1684.             av_log(c, AV_LOG_INFO,

  1685.                     "using alpha blendaway %s -> %s special converter\n",

  1686.                     av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1687.         return 0;

  1688.     }

  1689. 

  1690.     /* unscaled special cases */

  1691.     if (unscaled && !usesHFilter && !usesVFilter &&

  1692.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1693.         ff_get_unscaled_swscale(c);

  1694. 

  1695.         if (c->swscale) {

  1696.             if (flags & SWS_PRINT_INFO)

  1697.                 av_log(c, AV_LOG_INFO,

  1698.                        "using unscaled %s -> %s special converter\n",

  1699.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1700.             return 0;

  1701.         }

  1702.     }

  1703. 

  1704.     c->swscale = ff_getSwsFunc(c);

  1705.     return ff_init_filters(c);

  1706. fail: // FIXME replace things by appropriate error codes

  1707.     if (ret == RETCODE_USE_CASCADE)  {

  1708.         int tmpW = sqrt(srcW * (int64_t)dstW);

  1709.         int tmpH = sqrt(srcH * (int64_t)dstH);

  1710.         enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;

  1711. 

  1712.         if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)

  1713.             return AVERROR(EINVAL);

  1714. 

  1715.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1716.                              tmpW, tmpH, tmpFormat, 64);

  1717.         if (ret < 0)

  1718.             return ret;

  1719. 

  1720.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1721.                                                 tmpW, tmpH, tmpFormat,

  1722.                                                 flags, srcFilter, NULL, c->param);

  1723.         if (!c->cascaded_context[0])

  1724.             return -1;

  1725. 

  1726.         c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,

  1727.                                                 dstW, dstH, dstFormat,

  1728.                                                 flags, NULL, dstFilter, c->param);

  1729.         if (!c->cascaded_context[1])

  1730.             return -1;

  1731.         return 0;

  1732.     }

  1733.     return -1;

  1734. }

  1735. 

  1736. SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1737.                                int dstW, int dstH, enum AVPixelFormat dstFormat,

  1738.                                int flags, const double *param)

  1739. {

  1740.     SwsContext *c;

  1741. 

  1742.     if (!(c = sws_alloc_context()))

  1743.         return NULL;

  1744. 

  1745.     c->flags     = flags;

  1746.     c->srcW      = srcW;

  1747.     c->srcH      = srcH;

  1748.     c->dstW      = dstW;

  1749.     c->dstH      = dstH;

  1750.     c->srcFormat = srcFormat;

  1751.     c->dstFormat = dstFormat;

  1752. 

  1753.     if (param) {

  1754.         c->param[0] = param[0];

  1755.         c->param[1] = param[1];

  1756.     }

  1757. 

  1758.     return c;

  1759. }

  1760. 

  1761. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1762.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1763.                            int flags, SwsFilter *srcFilter,

  1764.                            SwsFilter *dstFilter, const double *param)

  1765. {

  1766.     SwsContext *c;

  1767. 

  1768.     c = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1769.                            dstW, dstH, dstFormat,

  1770.                            flags, param);

  1771.     if (!c)

  1772.         return NULL;

  1773. 

  1774.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1775.         sws_freeContext(c);

  1776.         return NULL;

  1777.     }

  1778. 

  1779.     return c;

  1780. }

  1781. 

  1782. static int isnan_vec(SwsVector *a)

  1783. {

  1784.     int i;

  1785.     for (i=0; i<a->length; i++)

  1786.         if (isnan(a->coeff[i]))

  1787.             return 1;

  1788.     return 0;

  1789. }

  1790. 

  1791. static void makenan_vec(SwsVector *a)

  1792. {

  1793.     int i;

  1794.     for (i=0; i<a->length; i++)

  1795.         a->coeff[i] = NAN;

  1796. }

  1797. 

  1798. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1799.                                 float lumaSharpen, float chromaSharpen,

  1800.                                 float chromaHShift, float chromaVShift,

  1801.                                 int verbose)

  1802. {

  1803.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1804.     if (!filter)

  1805.         return NULL;

  1806. 

  1807.     if (lumaGBlur != 0.0) {

  1808.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1809.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1810.     } else {

  1811.         filter->lumH = sws_getIdentityVec();

  1812.         filter->lumV = sws_getIdentityVec();

  1813.     }

  1814. 

  1815.     if (chromaGBlur != 0.0) {

  1816.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1817.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1818.     } else {

  1819.         filter->chrH = sws_getIdentityVec();

  1820.         filter->chrV = sws_getIdentityVec();

  1821.     }

  1822. 

  1823.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1824.         goto fail;

  1825. 

  1826.     if (chromaSharpen != 0.0) {

  1827.         SwsVector *id = sws_getIdentityVec();

  1828.         if (!id)

  1829.             goto fail;

  1830.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1831.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1832.         sws_addVec(filter->chrH, id);

  1833.         sws_addVec(filter->chrV, id);

  1834.         sws_freeVec(id);

  1835.     }

  1836. 

  1837.     if (lumaSharpen != 0.0) {

  1838.         SwsVector *id = sws_getIdentityVec();

  1839.         if (!id)

  1840.             goto fail;

  1841.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1842.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1843.         sws_addVec(filter->lumH, id);

  1844.         sws_addVec(filter->lumV, id);

  1845.         sws_freeVec(id);

  1846.     }

  1847. 

  1848.     if (chromaHShift != 0.0)

  1849.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1850. 

  1851.     if (chromaVShift != 0.0)

  1852.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1853. 

  1854.     sws_normalizeVec(filter->chrH, 1.0);

  1855.     sws_normalizeVec(filter->chrV, 1.0);

  1856.     sws_normalizeVec(filter->lumH, 1.0);

  1857.     sws_normalizeVec(filter->lumV, 1.0);

  1858. 

  1859.     if (isnan_vec(filter->chrH) ||

  1860.         isnan_vec(filter->chrV) ||

  1861.         isnan_vec(filter->lumH) ||

  1862.         isnan_vec(filter->lumV))

  1863.         goto fail;

  1864. 

  1865.     if (verbose)

  1866.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1867.     if (verbose)

  1868.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1869. 

  1870.     return filter;

  1871. 

  1872. fail:

  1873.     sws_freeVec(filter->lumH);

  1874.     sws_freeVec(filter->lumV);

  1875.     sws_freeVec(filter->chrH);

  1876.     sws_freeVec(filter->chrV);

  1877.     av_freep(&filter);

  1878.     return NULL;

  1879. }

  1880. 

  1881. SwsVector *sws_allocVec(int length)

  1882. {

  1883.     SwsVector *vec;

  1884. 

  1885.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1886.         return NULL;

  1887. 

  1888.     vec = av_malloc(sizeof(SwsVector));

  1889.     if (!vec)

  1890.         return NULL;

  1891.     vec->length = length;

  1892.     vec->coeff  = av_malloc(sizeof(double) * length);

  1893.     if (!vec->coeff)

  1894.         av_freep(&vec);

  1895.     return vec;

  1896. }

  1897. 

  1898. SwsVector *sws_getGaussianVec(double variance, double quality)

  1899. {

  1900.     const int length = (int)(variance * quality + 0.5) | 1;

  1901.     int i;

  1902.     double middle  = (length - 1) * 0.5;

  1903.     SwsVector *vec;

  1904. 

  1905.     if(variance < 0 || quality < 0)

  1906.         return NULL;

  1907. 

  1908.     vec = sws_allocVec(length);

  1909. 

  1910.     if (!vec)

  1911.         return NULL;

  1912. 

  1913.     for (i = 0; i < length; i++) {

  1914.         double dist = i - middle;

  1915.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1916.                         sqrt(2 * variance * M_PI);

  1917.     }

  1918. 

  1919.     sws_normalizeVec(vec, 1.0);

  1920. 

  1921.     return vec;

  1922. }

  1923. 

  1924. SwsVector *sws_getConstVec(double c, int length)

  1925. {

  1926.     int i;

  1927.     SwsVector *vec = sws_allocVec(length);

  1928. 

  1929.     if (!vec)

  1930.         return NULL;

  1931. 

  1932.     for (i = 0; i < length; i++)

  1933.         vec->coeff[i] = c;

  1934. 

  1935.     return vec;

  1936. }

  1937. 

  1938. SwsVector *sws_getIdentityVec(void)

  1939. {

  1940.     return sws_getConstVec(1.0, 1);

  1941. }

  1942. 

  1943. static double sws_dcVec(SwsVector *a)

  1944. {

  1945.     int i;

  1946.     double sum = 0;

  1947. 

  1948.     for (i = 0; i < a->length; i++)

  1949.         sum += a->coeff[i];

  1950. 

  1951.     return sum;

  1952. }

  1953. 

  1954. void sws_scaleVec(SwsVector *a, double scalar)

  1955. {

  1956.     int i;

  1957. 

  1958.     for (i = 0; i < a->length; i++)

  1959.         a->coeff[i] *= scalar;

  1960. }

  1961. 

  1962. void sws_normalizeVec(SwsVector *a, double height)

  1963. {

  1964.     sws_scaleVec(a, height / sws_dcVec(a));

  1965. }

  1966. 

  1967. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1968. {

  1969.     int length = a->length + b->length - 1;

  1970.     int i, j;

  1971.     SwsVector *vec = sws_getConstVec(0.0, length);

  1972. 

  1973.     if (!vec)

  1974.         return NULL;

  1975. 

  1976.     for (i = 0; i < a->length; i++) {

  1977.         for (j = 0; j < b->length; j++) {

  1978.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1979.         }

  1980.     }

  1981. 

  1982.     return vec;

  1983. }

  1984. 

  1985. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1986. {

  1987.     int length = FFMAX(a->length, b->length);

  1988.     int i;

  1989.     SwsVector *vec = sws_getConstVec(0.0, length);

  1990. 

  1991.     if (!vec)

  1992.         return NULL;

  1993. 

  1994.     for (i = 0; i < a->length; i++)

  1995.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1996.     for (i = 0; i < b->length; i++)

  1997.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1998. 

  1999.     return vec;

  2000. }

  2001. 

  2002. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  2003. {

  2004.     int length = FFMAX(a->length, b->length);

  2005.     int i;

  2006.     SwsVector *vec = sws_getConstVec(0.0, length);

  2007. 

  2008.     if (!vec)

  2009.         return NULL;

  2010. 

  2011.     for (i = 0; i < a->length; i++)

  2012.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2013.     for (i = 0; i < b->length; i++)

  2014.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  2015. 

  2016.     return vec;

  2017. }

  2018. 

  2019. /* shift left / or right if "shift" is negative */

  2020. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  2021. {

  2022.     int length = a->length + FFABS(shift) * 2;

  2023.     int i;

  2024.     SwsVector *vec = sws_getConstVec(0.0, length);

  2025. 

  2026.     if (!vec)

  2027.         return NULL;

  2028. 

  2029.     for (i = 0; i < a->length; i++) {

  2030.         vec->coeff[i + (length    - 1) / 2 -

  2031.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  2032.     }

  2033. 

  2034.     return vec;

  2035. }

  2036. 

  2037. void sws_shiftVec(SwsVector *a, int shift)

  2038. {

  2039.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  2040.     if (!shifted) {

  2041.         makenan_vec(a);

  2042.         return;

  2043.     }

  2044.     av_free(a->coeff);

  2045.     a->coeff  = shifted->coeff;

  2046.     a->length = shifted->length;

  2047.     av_free(shifted);

  2048. }

  2049. 

  2050. void sws_addVec(SwsVector *a, SwsVector *b)

  2051. {

  2052.     SwsVector *sum = sws_sumVec(a, b);

  2053.     if (!sum) {

  2054.         makenan_vec(a);

  2055.         return;

  2056.     }

  2057.     av_free(a->coeff);

  2058.     a->coeff  = sum->coeff;

  2059.     a->length = sum->length;

  2060.     av_free(sum);

  2061. }

  2062. 

  2063. void sws_subVec(SwsVector *a, SwsVector *b)

  2064. {

  2065.     SwsVector *diff = sws_diffVec(a, b);

  2066.     if (!diff) {

  2067.         makenan_vec(a);

  2068.         return;

  2069.     }

  2070.     av_free(a->coeff);

  2071.     a->coeff  = diff->coeff;

  2072.     a->length = diff->length;

  2073.     av_free(diff);

  2074. }

  2075. 

  2076. void sws_convVec(SwsVector *a, SwsVector *b)

  2077. {

  2078.     SwsVector *conv = sws_getConvVec(a, b);

  2079.     if (!conv) {

  2080.         makenan_vec(a);

  2081.         return;

  2082.     }

  2083.     av_free(a->coeff);

  2084.     a->coeff  = conv->coeff;

  2085.     a->length = conv->length;

  2086.     av_free(conv);

  2087. }

  2088. 

  2089. SwsVector *sws_cloneVec(SwsVector *a)

  2090. {

  2091.     SwsVector *vec = sws_allocVec(a->length);

  2092. 

  2093.     if (!vec)

  2094.         return NULL;

  2095. 

  2096.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  2097. 

  2098.     return vec;

  2099. }

  2100. 

  2101. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  2102. {

  2103.     int i;

  2104.     double max = 0;

  2105.     double min = 0;

  2106.     double range;

  2107. 

  2108.     for (i = 0; i < a->length; i++)

  2109.         if (a->coeff[i] > max)

  2110.             max = a->coeff[i];

  2111. 

  2112.     for (i = 0; i < a->length; i++)

  2113.         if (a->coeff[i] < min)

  2114.             min = a->coeff[i];

  2115. 

  2116.     range = max - min;

  2117. 

  2118.     for (i = 0; i < a->length; i++) {

  2119.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  2120.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  2121.         for (; x > 0; x--)

  2122.             av_log(log_ctx, log_level, " ");

  2123.         av_log(log_ctx, log_level, "|\n");

  2124.     }

  2125. }

  2126. 

  2127. void sws_freeVec(SwsVector *a)

  2128. {

  2129.     if (!a)

  2130.         return;

  2131.     av_freep(&a->coeff);

  2132.     a->length = 0;

  2133.     av_free(a);

  2134. }

  2135. 

  2136. void sws_freeFilter(SwsFilter *filter)

  2137. {

  2138.     if (!filter)

  2139.         return;

  2140. 

  2141.     sws_freeVec(filter->lumH);

  2142.     sws_freeVec(filter->lumV);

  2143.     sws_freeVec(filter->chrH);

  2144.     sws_freeVec(filter->chrV);

  2145.     av_free(filter);

  2146. }

  2147. 

  2148. void sws_freeContext(SwsContext *c)

  2149. {

  2150.     int i;

  2151.     if (!c)

  2152.         return;

  2153. 

  2154.     if (c->lumPixBuf) {

  2155.         for (i = 0; i < c->vLumBufSize; i++)

  2156.             av_freep(&c->lumPixBuf[i]);

  2157.         av_freep(&c->lumPixBuf);

  2158.     }

  2159. 

  2160.     if (c->chrUPixBuf) {

  2161.         for (i = 0; i < c->vChrBufSize; i++)

  2162.             av_freep(&c->chrUPixBuf[i]);

  2163.         av_freep(&c->chrUPixBuf);

  2164.         av_freep(&c->chrVPixBuf);

  2165.     }

  2166. 

  2167.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2168.         for (i = 0; i < c->vLumBufSize; i++)

  2169.             av_freep(&c->alpPixBuf[i]);

  2170.         av_freep(&c->alpPixBuf);

  2171.     }

  2172. 

  2173.     for (i = 0; i < 4; i++)

  2174.         av_freep(&c->dither_error[i]);

  2175. 

  2176.     av_freep(&c->vLumFilter);

  2177.     av_freep(&c->vChrFilter);

  2178.     av_freep(&c->hLumFilter);

  2179.     av_freep(&c->hChrFilter);

  2180. #if HAVE_ALTIVEC

  2181.     av_freep(&c->vYCoeffsBank);

  2182.     av_freep(&c->vCCoeffsBank);

  2183. #endif

  2184. 

  2185.     av_freep(&c->vLumFilterPos);

  2186.     av_freep(&c->vChrFilterPos);

  2187.     av_freep(&c->hLumFilterPos);

  2188.     av_freep(&c->hChrFilterPos);

  2189. 

  2190. #if HAVE_MMX_INLINE

  2191. #if USE_MMAP

  2192.     if (c->lumMmxextFilterCode)

  2193.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2194.     if (c->chrMmxextFilterCode)

  2195.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2196. #elif HAVE_VIRTUALALLOC

  2197.     if (c->lumMmxextFilterCode)

  2198.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2199.     if (c->chrMmxextFilterCode)

  2200.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2201. #else

  2202.     av_free(c->lumMmxextFilterCode);

  2203.     av_free(c->chrMmxextFilterCode);

  2204. #endif

  2205.     c->lumMmxextFilterCode = NULL;

  2206.     c->chrMmxextFilterCode = NULL;

  2207. #endif /* HAVE_MMX_INLINE */

  2208. 

  2209.     av_freep(&c->yuvTable);

  2210.     av_freep(&c->formatConvBuffer);

  2211. 

  2212.     sws_freeContext(c->cascaded_context[0]);

  2213.     sws_freeContext(c->cascaded_context[1]);

  2214.     sws_freeContext(c->cascaded_context[2]);

  2215.     memset(c->cascaded_context, 0, sizeof(c->cascaded_context));

  2216.     av_freep(&c->cascaded_tmp[0]);

  2217.     av_freep(&c->cascaded1_tmp[0]);

  2218. 

  2219.     av_freep(&c->gamma);

  2220.     av_freep(&c->inv_gamma);

  2221. 

  2222.     ff_free_filters(c);

  2223. 

  2224.     av_free(c);

  2225. }

  2226. 

  2227. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2228.                                         int srcH, enum AVPixelFormat srcFormat,

  2229.                                         int dstW, int dstH,

  2230.                                         enum AVPixelFormat dstFormat, int flags,

  2231.                                         SwsFilter *srcFilter,

  2232.                                         SwsFilter *dstFilter,

  2233.                                         const double *param)

  2234. {

  2235.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2236.                                              SWS_PARAM_DEFAULT };

  2237.     int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,

  2238.             src_v_chr_pos = -513, dst_v_chr_pos = -513;

  2239. 

  2240.     if (!param)

  2241.         param = default_param;

  2242. 

  2243.     if (context &&

  2244.         (context->srcW      != srcW      ||

  2245.          context->srcH      != srcH      ||

  2246.          context->srcFormat != srcFormat ||

  2247.          context->dstW      != dstW      ||

  2248.          context->dstH      != dstH      ||

  2249.          context->dstFormat != dstFormat ||

  2250.          context->flags     != flags     ||

  2251.          context->param[0]  != param[0]  ||

  2252.          context->param[1]  != param[1])) {

  2253. 

  2254.         av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);

  2255.         av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);

  2256.         av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);

  2257.         av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);

  2258.         sws_freeContext(context);

  2259.         context = NULL;

  2260.     }

  2261. 

  2262.     if (!context) {

  2263.         if (!(context = sws_alloc_context()))

  2264.             return NULL;

  2265.         context->srcW      = srcW;

  2266.         context->srcH      = srcH;

  2267.         context->srcFormat = srcFormat;

  2268.         context->dstW      = dstW;

  2269.         context->dstH      = dstH;

  2270.         context->dstFormat = dstFormat;

  2271.         context->flags     = flags;

  2272.         context->param[0]  = param[0];

  2273.         context->param[1]  = param[1];

  2274. 

  2275.         av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);

  2276.         av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);

  2277.         av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);

  2278.         av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);

  2279. 

  2280.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2281.             sws_freeContext(context);

  2282.             return NULL;

  2283.         }

  2284.     }

  2285.     return context;

  2286. }