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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, 0 },

  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. };

  229. 

  230. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  231. {

  232.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  233.            format_entries[pix_fmt].is_supported_in : 0;

  234. }

  235. 

  236. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  237. {

  238.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  239.            format_entries[pix_fmt].is_supported_out : 0;

  240. }

  241. 

  242. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  243. {

  244.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  245.            format_entries[pix_fmt].is_supported_endianness : 0;

  246. }

  247. 

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

  249.                              double dist)

  250. {

  251.     if (dist <= 1.0)

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

  253.     else

  254.         return getSplineCoeff(0.0,

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

  256.                                c + 3.0 * d,

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

  258.                               dist - 1.0);

  259. }

  260. 

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

  262. {

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

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

  265.     }

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

  267.     return pos >> chr_subsample;

  268. }

  269. 

  270. typedef struct {

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

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

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

  274. } ScaleAlgorithm;

  275. 

  276. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  288. };

  289. 

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

  291.                               int *outFilterSize, int xInc, int srcW,

  292.                               int dstW, int filterAlign, int one,

  293.                               int flags, int cpu_flags,

  294.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  296. {

  297.     int i;

  298.     int filterSize;

  299.     int filter2Size;

  300.     int minFilterSize;

  301.     int64_t *filter    = NULL;

  302.     int64_t *filter2   = NULL;

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

  304.     int ret            = -1;

  305. 

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

  307. 

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

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

  310. 

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

  312.         int i;

  313.         filterSize = 1;

  314.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  316. 

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

  318.             filter[i * filterSize] = fone;

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

  320.         }

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

  322.         int i;

  323.         int64_t xDstInSrc;

  324.         filterSize = 1;

  325.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  327. 

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

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

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

  331. 

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

  333.             filter[i]       = fone;

  334.             xDstInSrc      += xInc;

  335.         }

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

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

  338.         int i;

  339.         int64_t xDstInSrc;

  340.         filterSize = 2;

  341.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  343. 

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

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

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

  347.             int j;

  348. 

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

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

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

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

  353.                 if (coeff < 0)

  354.                     coeff = 0;

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

  356.                 xx++;

  357.             }

  358.             xDstInSrc += xInc;

  359.         }

  360.     } else {

  361.         int64_t xDstInSrc;

  362.         int sizeFactor = -1;

  363. 

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

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

  366.                 sizeFactor = scale_algorithms[i].size_factor;

  367.                 break;

  368.             }

  369.         }

  370.         if (flags & SWS_LANCZOS)

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

  372.         av_assert0(sizeFactor > 0);

  373. 

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

  375.             filterSize = 1 + sizeFactor;    // upscale

  376.         else

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

  378. 

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

  380.         filterSize = FFMAX(filterSize, 1);

  381. 

  382.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  384. 

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

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

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

  388.             int j;

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

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

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

  392.                 double floatd;

  393.                 int64_t coeff;

  394. 

  395.                 if (xInc > 1 << 16)

  396.                     d = d * dstW / srcW;

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

  398. 

  399.                 if (flags & SWS_BICUBIC) {

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

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

  402. 

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

  404.                         coeff = 0.0;

  405.                     } else {

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

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

  408. 

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

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

  411.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  412.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  413.                         else

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

  415.                                       (6 * B + 30 * C) * dd  +

  416.                                     (-12 * B - 48 * C) * d   +

  417.                                       (8 * B + 24 * C) * (1 << 30);

  418.                     }

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

  420.                 }

  421. #if 0

  422.                 else if (flags & SWS_X) {

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

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

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

  426.                 }

  427. #endif

  428.                 else if (flags & SWS_X) {

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

  430.                     double c;

  431. 

  432.                     if (floatd < 1.0)

  433.                         c = cos(floatd * M_PI);

  434.                     else

  435.                         c = -1.0;

  436.                     if (c < 0.0)

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

  438.                     else

  439.                         c = pow(c, A);

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

  441.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  447.                     else

  448.                         coeff = 0.0;

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

  450.                 } else if (flags & SWS_GAUSS) {

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

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

  453.                 } else if (flags & SWS_SINC) {

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

  455.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  459.                     if (floatd > p)

  460.                         coeff = 0;

  461.                 } else if (flags & SWS_BILINEAR) {

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

  463.                     if (coeff < 0)

  464.                         coeff = 0;

  465.                     coeff *= fone >> 30;

  466.                 } else if (flags & SWS_SPLINE) {

  467.                     double p = -2.196152422706632;

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

  469.                 } else {

  470.                     av_assert0(0);

  471.                 }

  472. 

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

  474.                 xx++;

  475.             }

  476.             xDstInSrc += 2 * xInc;

  477.         }

  478.     }

  479. 

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

  481.      * av_free(filter);

  482.      */

  483.     av_assert0(filterSize > 0);

  484.     filter2Size = filterSize;

  485.     if (srcFilter)

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

  487.     if (dstFilter)

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

  489.     av_assert0(filter2Size > 0);

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

  491. 

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

  493.         int j, k;

  494. 

  495.         if (srcFilter) {

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

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

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

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

  500.             }

  501.         } else {

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

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

  504.         }

  505.         // FIXME dstFilter

  506. 

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

  508.     }

  509.     av_freep(&filter);

  510. 

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

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

  513.     minFilterSize = 0;

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

  515.         int min = filter2Size;

  516.         int j;

  517.         int64_t cutOff = 0.0;

  518. 

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

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

  521.             int k;

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

  523. 

  524.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  525.                 break;

  526. 

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

  528.              * filter otherwise */

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

  530.                 break;

  531. 

  532.             // move filter coefficients left

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

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

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

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

  537.         }

  538. 

  539.         cutOff = 0;

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

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

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

  543. 

  544.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  545.                 break;

  546.             min--;

  547.         }

  548. 

  549.         if (min > minFilterSize)

  550.             minFilterSize = min;

  551.     }

  552. 

  553.     if (PPC_ALTIVEC(cpu_flags)) {

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

  555.         if (minFilterSize < 5)

  556.             filterAlign = 4;

  557. 

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

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

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

  561.         if (minFilterSize < 3)

  562.             filterAlign = 1;

  563.     }

  564. 

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

  566.         // special case for unscaled vertical filtering

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

  568.             filterAlign = 1;

  569.     }

  570. 

  571.     av_assert0(minFilterSize > 0);

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

  573.     av_assert0(filterSize > 0);

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

  575.     if (!filter)

  576.         goto fail;

  577.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  579.         ret = RETCODE_USE_CASCADE;

  580.         goto fail;

  581.     }

  582.     *outFilterSize = filterSize;

  583. 

  584.     if (flags & SWS_PRINT_INFO)

  585.         av_log(NULL, AV_LOG_VERBOSE,

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

  587.                filter2Size, filterSize);

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

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

  590.         int j;

  591. 

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

  593.             if (j >= filter2Size)

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

  595.             else

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

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

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

  599.         }

  600.     }

  601. 

  602.     // FIXME try to align filterPos if possible

  603. 

  604.     // fix borders

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

  606.         int j;

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

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

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

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

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

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

  613.             }

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

  615.         }

  616. 

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

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

  619.             int64_t acc = 0;

  620. 

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

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

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

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

  625.                 }

  626.             }

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

  628.                 if (j < shift) {

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

  630.                 } else {

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

  632.                 }

  633.             }

  634. 

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

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

  637.         }

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

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

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

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

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

  643.             }

  644.         }

  645.     }

  646. 

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

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

  649.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  651. 

  652.     /* normalize & store in outFilter */

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

  654.         int j;

  655.         int64_t error = 0;

  656.         int64_t sum   = 0;

  657. 

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

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

  660.         }

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

  662.         if (!sum) {

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

  664.             sum = 1;

  665.         }

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

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

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

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

  670.             error                                  = v - intV * sum;

  671.         }

  672.     }

  673. 

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

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

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

  677.                                                       * read over the end */

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

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

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

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

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

  683.     }

  684. 

  685.     ret = 0;

  686. 

  687. fail:

  688.     if(ret < 0)

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

  690.     av_free(filter);

  691.     av_free(filter2);

  692.     return ret;

  693. }

  694. 

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

  696. {

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

  698.     int64_t vr =  table[0];

  699.     int64_t ub =  table[1];

  700.     int64_t ug = -table[2];

  701.     int64_t vg = -table[3];

  702.     int64_t ONE = 65536;

  703.     int64_t cy = ONE;

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

  705.     int i;

  706.     static const int8_t map[] = {

  707.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  708.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

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

  710.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  711.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  712.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

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

  714.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  715.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  716.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

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

  718.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  719.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

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

  721.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

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

  723.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

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

  725.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

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

  727.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

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

  729.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  730.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  731.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  732.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  733.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  734.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  735.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  736.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  737.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  738.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  742.     };

  743. 

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

  745. 

  746.     if (!dstRange) {

  747.         cy = cy * 255 / 219;

  748.     } else {

  749.         vr = vr * 224 / 255;

  750.         ub = ub * 224 / 255;

  751.         ug = ug * 224 / 255;

  752.         vg = vg * 224 / 255;

  753.     }

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

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

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

  757. 

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

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

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

  761. 

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

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

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

  765. 

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

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

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

  769. 

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

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

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

  773. 

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

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

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

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

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

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

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

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

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

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

  784.     }

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

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

  787. }

  788. 

  789. static void fill_xyztables(struct SwsContext *c)

  790. {

  791.     int i;

  792.     double xyzgamma = XYZ_GAMMA;

  793.     double rgbgamma = 1.0 / RGB_GAMMA;

  794.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  795.     double rgbgammainv = RGB_GAMMA;

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

  797.         {13270, -6295, -2041},

  798.         {-3969,  7682,   170},

  799.         {  228,  -835,  4329} };

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

  801.         {1689, 1464,  739},

  802.         { 871, 2929,  296},

  803.         {  79,  488, 3891} };

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

  805. 

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

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

  808.     c->xyzgamma = xyzgamma_tab;

  809.     c->rgbgamma = rgbgamma_tab;

  810.     c->xyzgammainv = xyzgammainv_tab;

  811.     c->rgbgammainv = rgbgammainv_tab;

  812. 

  813.     if (rgbgamma_tab[4095])

  814.         return;

  815. 

  816.     /* set gamma vectors */

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

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

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

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

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

  822.     }

  823. }

  824. 

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

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

  827.                              int brightness, int contrast, int saturation)

  828. {

  829.     const AVPixFmtDescriptor *desc_dst;

  830.     const AVPixFmtDescriptor *desc_src;

  831.     int need_reinit = 0;

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

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

  834. 

  835.     handle_formats(c);

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

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

  838. 

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

  840.         dstRange = 0;

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

  842.         srcRange = 0;

  843. 

  844.     c->brightness = brightness;

  845.     c->contrast   = contrast;

  846.     c->saturation = saturation;

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

  848.         need_reinit = 1;

  849.     c->srcRange   = srcRange;

  850.     c->dstRange   = dstRange;

  851. 

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

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

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

  855.         ff_sws_init_range_convert(c);

  856. 

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

  858.         return -1;

  859. 

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

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

  862. 

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

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

  865.                                  contrast, saturation);

  866.         // FIXME factorize

  867. 

  868.         if (ARCH_PPC)

  869.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  870.                                        contrast, saturation);

  871.     }

  872. 

  873.     fill_rgb2yuv_table(c, table, dstRange);

  874. 

  875.     return 0;

  876. }

  877. 

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

  879.                              int *srcRange, int **table, int *dstRange,

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

  881. {

  882.     if (!c )

  883.         return -1;

  884. 

  885.     *inv_table  = c->srcColorspaceTable;

  886.     *table      = c->dstColorspaceTable;

  887.     *srcRange   = c->srcRange;

  888.     *dstRange   = c->dstRange;

  889.     *brightness = c->brightness;

  890.     *contrast   = c->contrast;

  891.     *saturation = c->saturation;

  892. 

  893.     return 0;

  894. }

  895. 

  896. static int handle_jpeg(enum AVPixelFormat *format)

  897. {

  898.     switch (*format) {

  899.     case AV_PIX_FMT_YUVJ420P:

  900.         *format = AV_PIX_FMT_YUV420P;

  901.         return 1;

  902.     case AV_PIX_FMT_YUVJ411P:

  903.         *format = AV_PIX_FMT_YUV411P;

  904.         return 1;

  905.     case AV_PIX_FMT_YUVJ422P:

  906.         *format = AV_PIX_FMT_YUV422P;

  907.         return 1;

  908.     case AV_PIX_FMT_YUVJ444P:

  909.         *format = AV_PIX_FMT_YUV444P;

  910.         return 1;

  911.     case AV_PIX_FMT_YUVJ440P:

  912.         *format = AV_PIX_FMT_YUV440P;

  913.         return 1;

  914.     case AV_PIX_FMT_GRAY8:

  915.     case AV_PIX_FMT_GRAY16LE:

  916.     case AV_PIX_FMT_GRAY16BE:

  917.         return 1;

  918.     default:

  919.         return 0;

  920.     }

  921. }

  922. 

  923. static int handle_0alpha(enum AVPixelFormat *format)

  924. {

  925.     switch (*format) {

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

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

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

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

  930.     default:                                          return 0;

  931.     }

  932. }

  933. 

  934. static int handle_xyz(enum AVPixelFormat *format)

  935. {

  936.     switch (*format) {

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

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

  939.     default:                                                return 0;

  940.     }

  941. }

  942. 

  943. static void handle_formats(SwsContext *c)

  944. {

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

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

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

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

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

  950.         fill_xyztables(c);

  951. }

  952. 

  953. SwsContext *sws_alloc_context(void)

  954. {

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

  956. 

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

  958. 

  959.     if (c) {

  960.         c->av_class = &sws_context_class;

  961.         av_opt_set_defaults(c);

  962.     }

  963. 

  964.     return c;

  965. }

  966. 

  967. static uint16_t * alloc_gamma_tbl(double e)

  968. {

  969.     int i = 0;

  970.     uint16_t * tbl;

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

  972.     if (!tbl)

  973.         return NULL;

  974. 

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

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

  977.     }

  978.     return tbl;

  979. }

  980. 

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

  982.                              SwsFilter *dstFilter)

  983. {

  984.     int i, j;

  985.     int usesVFilter, usesHFilter;

  986.     int unscaled;

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

  988.     int srcW              = c->srcW;

  989.     int srcH              = c->srcH;

  990.     int dstW              = c->dstW;

  991.     int dstH              = c->dstH;

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

  993.     int flags, cpu_flags;

  994.     enum AVPixelFormat srcFormat = c->srcFormat;

  995.     enum AVPixelFormat dstFormat = c->dstFormat;

  996.     const AVPixFmtDescriptor *desc_src;

  997.     const AVPixFmtDescriptor *desc_dst;

  998.     int ret = 0;

  999.     enum AVPixelFormat tmpFmt;

  1000. 

  1001.     cpu_flags = av_get_cpu_flags();

  1002.     flags     = c->flags;

  1003.     emms_c();

  1004.     if (!rgb15to16)

  1005.         sws_rgb2rgb_init();

  1006. 

  1007.     unscaled = (srcW == dstW && srcH == dstH);

  1008. 

  1009.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1010.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1011. 

  1012.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1013.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1014. 

  1015.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1016.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1017.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1018.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1019. 

  1020.     handle_formats(c);

  1021.     srcFormat = c->srcFormat;

  1022.     dstFormat = c->dstFormat;

  1023.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1024.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1025. 

  1026.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1027.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1028.     if (!sws_isSupportedInput(srcFormat)) {

  1029.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1030.                av_get_pix_fmt_name(srcFormat));

  1031.         return AVERROR(EINVAL);

  1032.     }

  1033.     if (!sws_isSupportedOutput(dstFormat)) {

  1034.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1035.                av_get_pix_fmt_name(dstFormat));

  1036.         return AVERROR(EINVAL);

  1037.     }

  1038.     }

  1039. 

  1040.     i = flags & (SWS_POINT         |

  1041.                  SWS_AREA          |

  1042.                  SWS_BILINEAR      |

  1043.                  SWS_FAST_BILINEAR |

  1044.                  SWS_BICUBIC       |

  1045.                  SWS_X             |

  1046.                  SWS_GAUSS         |

  1047.                  SWS_LANCZOS       |

  1048.                  SWS_SINC          |

  1049.                  SWS_SPLINE        |

  1050.                  SWS_BICUBLIN);

  1051. 

  1052.     /* provide a default scaler if not set by caller */

  1053.     if (!i) {

  1054.         if (dstW < srcW && dstH < srcH)

  1055.             flags |= SWS_BICUBIC;

  1056.         else if (dstW > srcW && dstH > srcH)

  1057.             flags |= SWS_BICUBIC;

  1058.         else

  1059.             flags |= SWS_BICUBIC;

  1060.         c->flags = flags;

  1061.     } else if (i & (i - 1)) {

  1062.         av_log(c, AV_LOG_ERROR,

  1063.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1064.         return AVERROR(EINVAL);

  1065.     }

  1066.     /* sanity check */

  1067.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1068.         /* FIXME check if these are enough and try to lower them after

  1069.          * fixing the relevant parts of the code */

  1070.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1071.                srcW, srcH, dstW, dstH);

  1072.         return AVERROR(EINVAL);

  1073.     }

  1074. 

  1075.     if (!dstFilter)

  1076.         dstFilter = &dummyFilter;

  1077.     if (!srcFilter)

  1078.         srcFilter = &dummyFilter;

  1079. 

  1080.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1081.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1082.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1083.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1084.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1085. 

  1086.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1087.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1088.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1089.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1090.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1091.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1092.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1093.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1094. 

  1095.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1096.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1097. 

  1098.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1099.         if (dstW&1) {

  1100.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1101.             flags |= SWS_FULL_CHR_H_INT;

  1102.             c->flags = flags;

  1103.         }

  1104. 

  1105.         if (   c->chrSrcHSubSample == 0

  1106.             && c->chrSrcVSubSample == 0

  1107.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1108.             && !(c->flags & SWS_FAST_BILINEAR)

  1109.         ) {

  1110.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1111.             flags |= SWS_FULL_CHR_H_INT;

  1112.             c->flags = flags;

  1113.         }

  1114.     }

  1115. 

  1116.     if (c->dither == SWS_DITHER_AUTO) {

  1117.         if (flags & SWS_ERROR_DIFFUSION)

  1118.             c->dither = SWS_DITHER_ED;

  1119.     }

  1120. 

  1121.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1122.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1123.        dstFormat == AV_PIX_FMT_BGR8 ||

  1124.        dstFormat == AV_PIX_FMT_RGB8) {

  1125.         if (c->dither == SWS_DITHER_AUTO)

  1126.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1127.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1128.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1129.                 av_log(c, AV_LOG_DEBUG,

  1130.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1131.                     av_get_pix_fmt_name(dstFormat));

  1132.                 flags   |= SWS_FULL_CHR_H_INT;

  1133.                 c->flags = flags;

  1134.             }

  1135.         }

  1136.         if (flags & SWS_FULL_CHR_H_INT) {

  1137.             if (c->dither == SWS_DITHER_BAYER) {

  1138.                 av_log(c, AV_LOG_DEBUG,

  1139.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1140.                     av_get_pix_fmt_name(dstFormat));

  1141.                 c->dither = SWS_DITHER_ED;

  1142.             }

  1143.         }

  1144.     }

  1145.     if (isPlanarRGB(dstFormat)) {

  1146.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1147.             av_log(c, AV_LOG_DEBUG,

  1148.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1149.                    av_get_pix_fmt_name(dstFormat));

  1150.             flags   |= SWS_FULL_CHR_H_INT;

  1151.             c->flags = flags;

  1152.         }

  1153.     }

  1154. 

  1155.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1156.      * chroma interpolation */

  1157.     if (flags & SWS_FULL_CHR_H_INT &&

  1158.         isAnyRGB(dstFormat)        &&

  1159.         !isPlanarRGB(dstFormat)    &&

  1160.         dstFormat != AV_PIX_FMT_RGBA  &&

  1161.         dstFormat != AV_PIX_FMT_ARGB  &&

  1162.         dstFormat != AV_PIX_FMT_BGRA  &&

  1163.         dstFormat != AV_PIX_FMT_ABGR  &&

  1164.         dstFormat != AV_PIX_FMT_RGB24 &&

  1165.         dstFormat != AV_PIX_FMT_BGR24 &&

  1166.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1167.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1168.         dstFormat != AV_PIX_FMT_BGR8 &&

  1169.         dstFormat != AV_PIX_FMT_RGB8

  1170.     ) {

  1171.         av_log(c, AV_LOG_WARNING,

  1172.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1173.                av_get_pix_fmt_name(dstFormat));

  1174.         flags   &= ~SWS_FULL_CHR_H_INT;

  1175.         c->flags = flags;

  1176.     }

  1177.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1178.         c->chrDstHSubSample = 1;

  1179. 

  1180.     // drop some chroma lines if the user wants it

  1181.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1182.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1183.     c->chrSrcVSubSample += c->vChrDrop;

  1184. 

  1185.     /* drop every other pixel for chroma calculation unless user

  1186.      * wants full chroma */

  1187.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1188.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1189.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1190.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1191.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1192.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1193.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1194.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1195.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1196.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1197.          (flags & SWS_FAST_BILINEAR)))

  1198.         c->chrSrcHSubSample = 1;

  1199. 

  1200.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1201.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1202.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1203.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1204.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1205. 

  1206.     FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1207. 

  1208.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1209.     if (c->srcBpc < 8)

  1210.         c->srcBpc = 8;

  1211.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1212.     if (c->dstBpc < 8)

  1213.         c->dstBpc = 8;

  1214.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1215.         c->srcBpc = 16;

  1216.     if (c->dstBpc == 16)

  1217.         dst_stride <<= 1;

  1218. 

  1219.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1220.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1221.                              c->chrDstW >= c->chrSrcW &&

  1222.                              (srcW & 15) == 0;

  1223.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1224. 

  1225.             && (flags & SWS_FAST_BILINEAR)) {

  1226.             if (flags & SWS_PRINT_INFO)

  1227.                 av_log(c, AV_LOG_INFO,

  1228.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1229.         }

  1230.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1231.             c->canMMXEXTBeUsed = 0;

  1232.     } else

  1233.         c->canMMXEXTBeUsed = 0;

  1234. 

  1235.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1236.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1237. 

  1238.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1239.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1240.      * correct scaling.

  1241.      * n-2 is the last chrominance sample available.

  1242.      * This is not perfect, but no one should notice the difference, the more

  1243.      * correct variant would be like the vertical one, but that would require

  1244.      * some special code for the first and last pixel */

  1245.     if (flags & SWS_FAST_BILINEAR) {

  1246.         if (c->canMMXEXTBeUsed) {

  1247.             c->lumXInc += 20;

  1248.             c->chrXInc += 20;

  1249.         }

  1250.         // we don't use the x86 asm scaler if MMX is available

  1251.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1252.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1253.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1254.         }

  1255.     }

  1256. 

  1257.     // hardcoded for now

  1258.     c->gamma_value = 2.2;

  1259.     tmpFmt = AV_PIX_FMT_RGBA64LE;

  1260. 

  1261. 

  1262.     if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {

  1263.         SwsContext *c2;

  1264.         c->cascaded_context[0] = NULL;

  1265. 

  1266.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1267.                             srcW, srcH, tmpFmt, 64);

  1268.         if (ret < 0)

  1269.             return ret;

  1270. 

  1271.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1272.                                                 srcW, srcH, tmpFmt,

  1273.                                                 flags, NULL, NULL, c->param);

  1274.         if (!c->cascaded_context[0]) {

  1275.             return -1;

  1276.         }

  1277. 

  1278.         c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,

  1279.                                                 dstW, dstH, tmpFmt,

  1280.                                                 flags, srcFilter, dstFilter, c->param);

  1281. 

  1282.         if (!c->cascaded_context[1])

  1283.             return -1;

  1284. 

  1285.         c2 = c->cascaded_context[1];

  1286.         c2->is_internal_gamma = 1;

  1287.         c2->gamma     = alloc_gamma_tbl(    c->gamma_value);

  1288.         c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);

  1289.         if (!c2->gamma || !c2->inv_gamma)

  1290.             return AVERROR(ENOMEM);

  1291. 

  1292.         c->cascaded_context[2] = NULL;

  1293.         if (dstFormat != tmpFmt) {

  1294.             ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,

  1295.                                 dstW, dstH, tmpFmt, 64);

  1296.             if (ret < 0)

  1297.                 return ret;

  1298. 

  1299.             c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,

  1300.                                                 dstW, dstH, dstFormat,

  1301.                                                 flags, NULL, NULL, c->param);

  1302.             if (!c->cascaded_context[2])

  1303.                 return -1;

  1304.         }

  1305.         return 0;

  1306.     }

  1307. 

  1308.     if (isBayer(srcFormat)) {

  1309.         if (!unscaled ||

  1310.             (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {

  1311.             enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;

  1312. 

  1313.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1314.                                 srcW, srcH, tmpFormat, 64);

  1315.             if (ret < 0)

  1316.                 return ret;

  1317. 

  1318.             c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1319.                                                     srcW, srcH, tmpFormat,

  1320.                                                     flags, srcFilter, NULL, c->param);

  1321.             if (!c->cascaded_context[0])

  1322.                 return -1;

  1323. 

  1324.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1325.                                                     dstW, dstH, dstFormat,

  1326.                                                     flags, NULL, dstFilter, c->param);

  1327.             if (!c->cascaded_context[1])

  1328.                 return -1;

  1329.             return 0;

  1330.         }

  1331.     }

  1332. 

  1333. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1334. 

  1335.     /* precalculate horizontal scaler filter coefficients */

  1336.     {

  1337. #if HAVE_MMXEXT_INLINE

  1338. // can't downscale !!!

  1339.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1340.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1341.                                                              NULL, NULL, 8);

  1342.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1343.                                                              NULL, NULL, NULL, 4);

  1344. 

  1345. #if USE_MMAP

  1346.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1347.                                           PROT_READ | PROT_WRITE,

  1348.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1349.                                           -1, 0);

  1350.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1351.                                           PROT_READ | PROT_WRITE,

  1352.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1353.                                           -1, 0);

  1354. #elif HAVE_VIRTUALALLOC

  1355.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1356.                                                   c->lumMmxextFilterCodeSize,

  1357.                                                   MEM_COMMIT,

  1358.                                                   PAGE_EXECUTE_READWRITE);

  1359.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1360.                                                   c->chrMmxextFilterCodeSize,

  1361.                                                   MEM_COMMIT,

  1362.                                                   PAGE_EXECUTE_READWRITE);

  1363. #else

  1364.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1365.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1366. #endif

  1367. 

  1368. #ifdef MAP_ANONYMOUS

  1369.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1370. #else

  1371.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1372. #endif

  1373.             {

  1374.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1375.                 return AVERROR(ENOMEM);

  1376.             }

  1377. 

  1378.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1379.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1380.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1381.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1382. 

  1383.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1384.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1385.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1386.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1387. 

  1388. #if USE_MMAP

  1389.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1390.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1391.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1392.                 goto fail;

  1393.             }

  1394. #endif

  1395.         } else

  1396. #endif /* HAVE_MMXEXT_INLINE */

  1397.         {

  1398.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1399.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1400. 

  1401.             if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1402.                            &c->hLumFilterSize, c->lumXInc,

  1403.                            srcW, dstW, filterAlign, 1 << 14,

  1404.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1405.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1406.                            c->param,

  1407.                            get_local_pos(c, 0, 0, 0),

  1408.                            get_local_pos(c, 0, 0, 0))) < 0)

  1409.                 goto fail;

  1410.             if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1411.                            &c->hChrFilterSize, c->chrXInc,

  1412.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1413.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1414.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1415.                            c->param,

  1416.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1417.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)

  1418.                 goto fail;

  1419.         }

  1420.     } // initialize horizontal stuff

  1421. 

  1422.     /* precalculate vertical scaler filter coefficients */

  1423.     {

  1424.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1425.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1426. 

  1427.         if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1428.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1429.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1430.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1431.                        c->param,

  1432.                        get_local_pos(c, 0, 0, 1),

  1433.                        get_local_pos(c, 0, 0, 1))) < 0)

  1434.             goto fail;

  1435.         if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1436.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1437.                        filterAlign, (1 << 12),

  1438.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1439.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1440.                        c->param,

  1441.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1442.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)

  1443. 

  1444.             goto fail;

  1445. 

  1446. #if HAVE_ALTIVEC

  1447.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1448.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1449. 

  1450.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1451.             int j;

  1452.             short *p = (short *)&c->vYCoeffsBank[i];

  1453.             for (j = 0; j < 8; j++)

  1454.                 p[j] = c->vLumFilter[i];

  1455.         }

  1456. 

  1457.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1458.             int j;

  1459.             short *p = (short *)&c->vCCoeffsBank[i];

  1460.             for (j = 0; j < 8; j++)

  1461.                 p[j] = c->vChrFilter[i];

  1462.         }

  1463. #endif

  1464.     }

  1465. 

  1466.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1467.     c->vLumBufSize = c->vLumFilterSize;

  1468.     c->vChrBufSize = c->vChrFilterSize;

  1469.     for (i = 0; i < dstH; i++) {

  1470.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1471.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1472.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1473.                                << c->chrSrcVSubSample));

  1474. 

  1475.         nextSlice >>= c->chrSrcVSubSample;

  1476.         nextSlice <<= c->chrSrcVSubSample;

  1477.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1478.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1479.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1480.             (nextSlice >> c->chrSrcVSubSample))

  1481.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1482.                              c->vChrFilterPos[chrI];

  1483.     }

  1484. 

  1485.     for (i = 0; i < 4; i++)

  1486.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1487. 

  1488.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1489.      * need to allocate several megabytes to handle all possible cases) */

  1490.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1491.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1492.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1493.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1494.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1495.     /* Note we need at least one pixel more at the end because of the MMX code

  1496.      * (just in case someone wants to replace the 4000/8000). */

  1497.     /* align at 16 bytes for AltiVec */

  1498.     for (i = 0; i < c->vLumBufSize; i++) {

  1499.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1500.                           dst_stride + 16, fail);

  1501.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1502.     }

  1503.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1504.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1505.     c->uv_offx2 = dst_stride + 16;

  1506.     for (i = 0; i < c->vChrBufSize; i++) {

  1507.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1508.                          dst_stride * 2 + 32, fail);

  1509.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1510.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1511.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1512.     }

  1513.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1514.         for (i = 0; i < c->vLumBufSize; i++) {

  1515.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1516.                               dst_stride + 16, fail);

  1517.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1518.         }

  1519. 

  1520.     // try to avoid drawing green stuff between the right end and the stride end

  1521.     for (i = 0; i < c->vChrBufSize; i++)

  1522.         if(desc_dst->comp[0].depth_minus1 == 15){

  1523.             av_assert0(c->dstBpc > 14);

  1524.             for(j=0; j<dst_stride/2+1; j++)

  1525.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1526.         } else

  1527.             for(j=0; j<dst_stride+1; j++)

  1528.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1529. 

  1530.     av_assert0(c->chrDstH <= dstH);

  1531. 

  1532.     if (flags & SWS_PRINT_INFO) {

  1533.         const char *scaler = NULL, *cpucaps;

  1534. 

  1535.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1536.             if (flags & scale_algorithms[i].flag) {

  1537.                 scaler = scale_algorithms[i].description;

  1538.                 break;

  1539.             }

  1540.         }

  1541.         if (!scaler)

  1542.             scaler =  "ehh flags invalid?!";

  1543.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1544.                scaler,

  1545.                av_get_pix_fmt_name(srcFormat),

  1546. #ifdef DITHER1XBPP

  1547.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1548.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1549.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1550.                                                              "dithered " : "",

  1551. #else

  1552.                "",

  1553. #endif

  1554.                av_get_pix_fmt_name(dstFormat));

  1555. 

  1556.         if (INLINE_MMXEXT(cpu_flags))

  1557.             cpucaps = "MMXEXT";

  1558.         else if (INLINE_AMD3DNOW(cpu_flags))

  1559.             cpucaps = "3DNOW";

  1560.         else if (INLINE_MMX(cpu_flags))

  1561.             cpucaps = "MMX";

  1562.         else if (PPC_ALTIVEC(cpu_flags))

  1563.             cpucaps = "AltiVec";

  1564.         else

  1565.             cpucaps = "C";

  1566. 

  1567.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1568. 

  1569.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1570.         av_log(c, AV_LOG_DEBUG,

  1571.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1572.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1573.         av_log(c, AV_LOG_DEBUG,

  1574.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1575.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1576.                c->chrXInc, c->chrYInc);

  1577.     }

  1578. 

  1579.     /* unscaled special cases */

  1580.     if (unscaled && !usesHFilter && !usesVFilter &&

  1581.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1582.         ff_get_unscaled_swscale(c);

  1583. 

  1584.         if (c->swscale) {

  1585.             if (flags & SWS_PRINT_INFO)

  1586.                 av_log(c, AV_LOG_INFO,

  1587.                        "using unscaled %s -> %s special converter\n",

  1588.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1589.             return 0;

  1590.         }

  1591.     }

  1592. 

  1593.     c->swscale = ff_getSwsFunc(c);

  1594.     return 0;

  1595. fail: // FIXME replace things by appropriate error codes

  1596.     if (ret == RETCODE_USE_CASCADE)  {

  1597.         int tmpW = sqrt(srcW * (int64_t)dstW);

  1598.         int tmpH = sqrt(srcH * (int64_t)dstH);

  1599.         enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;

  1600. 

  1601.         if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)

  1602.             return AVERROR(EINVAL);

  1603. 

  1604.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1605.                              tmpW, tmpH, tmpFormat, 64);

  1606.         if (ret < 0)

  1607.             return ret;

  1608. 

  1609.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1610.                                                 tmpW, tmpH, tmpFormat,

  1611.                                                 flags, srcFilter, NULL, c->param);

  1612.         if (!c->cascaded_context[0])

  1613.             return -1;

  1614. 

  1615.         c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,

  1616.                                                 dstW, dstH, dstFormat,

  1617.                                                 flags, NULL, dstFilter, c->param);

  1618.         if (!c->cascaded_context[1])

  1619.             return -1;

  1620.         return 0;

  1621.     }

  1622.     return -1;

  1623. }

  1624. 

  1625. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1626.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1627.                            int flags, SwsFilter *srcFilter,

  1628.                            SwsFilter *dstFilter, const double *param)

  1629. {

  1630.     SwsContext *c;

  1631. 

  1632.     if (!(c = sws_alloc_context()))

  1633.         return NULL;

  1634. 

  1635.     c->flags     = flags;

  1636.     c->srcW      = srcW;

  1637.     c->srcH      = srcH;

  1638.     c->dstW      = dstW;

  1639.     c->dstH      = dstH;

  1640.     c->srcFormat = srcFormat;

  1641.     c->dstFormat = dstFormat;

  1642. 

  1643.     if (param) {

  1644.         c->param[0] = param[0];

  1645.         c->param[1] = param[1];

  1646.     }

  1647. 

  1648.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1649.         sws_freeContext(c);

  1650.         return NULL;

  1651.     }

  1652. 

  1653.     return c;

  1654. }

  1655. 

  1656. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1657.                                 float lumaSharpen, float chromaSharpen,

  1658.                                 float chromaHShift, float chromaVShift,

  1659.                                 int verbose)

  1660. {

  1661.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1662.     if (!filter)

  1663.         return NULL;

  1664. 

  1665.     if (lumaGBlur != 0.0) {

  1666.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1667.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1668.     } else {

  1669.         filter->lumH = sws_getIdentityVec();

  1670.         filter->lumV = sws_getIdentityVec();

  1671.     }

  1672. 

  1673.     if (chromaGBlur != 0.0) {

  1674.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1675.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1676.     } else {

  1677.         filter->chrH = sws_getIdentityVec();

  1678.         filter->chrV = sws_getIdentityVec();

  1679.     }

  1680. 

  1681.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1682.         goto fail;

  1683. 

  1684.     if (chromaSharpen != 0.0) {

  1685.         SwsVector *id = sws_getIdentityVec();

  1686.         if (!id)

  1687.             goto fail;

  1688.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1689.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1690.         sws_addVec(filter->chrH, id);

  1691.         sws_addVec(filter->chrV, id);

  1692.         sws_freeVec(id);

  1693.     }

  1694. 

  1695.     if (lumaSharpen != 0.0) {

  1696.         SwsVector *id = sws_getIdentityVec();

  1697.         if (!id)

  1698.             goto fail;

  1699.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1700.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1701.         sws_addVec(filter->lumH, id);

  1702.         sws_addVec(filter->lumV, id);

  1703.         sws_freeVec(id);

  1704.     }

  1705. 

  1706.     if (chromaHShift != 0.0)

  1707.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1708. 

  1709.     if (chromaVShift != 0.0)

  1710.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1711. 

  1712.     sws_normalizeVec(filter->chrH, 1.0);

  1713.     sws_normalizeVec(filter->chrV, 1.0);

  1714.     sws_normalizeVec(filter->lumH, 1.0);

  1715.     sws_normalizeVec(filter->lumV, 1.0);

  1716. 

  1717.     if (verbose)

  1718.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1719.     if (verbose)

  1720.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1721. 

  1722.     return filter;

  1723. 

  1724. fail:

  1725.     sws_freeVec(filter->lumH);

  1726.     sws_freeVec(filter->lumV);

  1727.     sws_freeVec(filter->chrH);

  1728.     sws_freeVec(filter->chrV);

  1729.     av_freep(&filter);

  1730.     return NULL;

  1731. }

  1732. 

  1733. SwsVector *sws_allocVec(int length)

  1734. {

  1735.     SwsVector *vec;

  1736. 

  1737.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1738.         return NULL;

  1739. 

  1740.     vec = av_malloc(sizeof(SwsVector));

  1741.     if (!vec)

  1742.         return NULL;

  1743.     vec->length = length;

  1744.     vec->coeff  = av_malloc(sizeof(double) * length);

  1745.     if (!vec->coeff)

  1746.         av_freep(&vec);

  1747.     return vec;

  1748. }

  1749. 

  1750. SwsVector *sws_getGaussianVec(double variance, double quality)

  1751. {

  1752.     const int length = (int)(variance * quality + 0.5) | 1;

  1753.     int i;

  1754.     double middle  = (length - 1) * 0.5;

  1755.     SwsVector *vec;

  1756. 

  1757.     if(variance < 0 || quality < 0)

  1758.         return NULL;

  1759. 

  1760.     vec = sws_allocVec(length);

  1761. 

  1762.     if (!vec)

  1763.         return NULL;

  1764. 

  1765.     for (i = 0; i < length; i++) {

  1766.         double dist = i - middle;

  1767.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1768.                         sqrt(2 * variance * M_PI);

  1769.     }

  1770. 

  1771.     sws_normalizeVec(vec, 1.0);

  1772. 

  1773.     return vec;

  1774. }

  1775. 

  1776. SwsVector *sws_getConstVec(double c, int length)

  1777. {

  1778.     int i;

  1779.     SwsVector *vec = sws_allocVec(length);

  1780. 

  1781.     if (!vec)

  1782.         return NULL;

  1783. 

  1784.     for (i = 0; i < length; i++)

  1785.         vec->coeff[i] = c;

  1786. 

  1787.     return vec;

  1788. }

  1789. 

  1790. SwsVector *sws_getIdentityVec(void)

  1791. {

  1792.     return sws_getConstVec(1.0, 1);

  1793. }

  1794. 

  1795. static double sws_dcVec(SwsVector *a)

  1796. {

  1797.     int i;

  1798.     double sum = 0;

  1799. 

  1800.     for (i = 0; i < a->length; i++)

  1801.         sum += a->coeff[i];

  1802. 

  1803.     return sum;

  1804. }

  1805. 

  1806. void sws_scaleVec(SwsVector *a, double scalar)

  1807. {

  1808.     int i;

  1809. 

  1810.     for (i = 0; i < a->length; i++)

  1811.         a->coeff[i] *= scalar;

  1812. }

  1813. 

  1814. void sws_normalizeVec(SwsVector *a, double height)

  1815. {

  1816.     sws_scaleVec(a, height / sws_dcVec(a));

  1817. }

  1818. 

  1819. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1820. {

  1821.     int length = a->length + b->length - 1;

  1822.     int i, j;

  1823.     SwsVector *vec = sws_getConstVec(0.0, length);

  1824. 

  1825.     if (!vec)

  1826.         return NULL;

  1827. 

  1828.     for (i = 0; i < a->length; i++) {

  1829.         for (j = 0; j < b->length; j++) {

  1830.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1831.         }

  1832.     }

  1833. 

  1834.     return vec;

  1835. }

  1836. 

  1837. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1838. {

  1839.     int length = FFMAX(a->length, b->length);

  1840.     int i;

  1841.     SwsVector *vec = sws_getConstVec(0.0, length);

  1842. 

  1843.     if (!vec)

  1844.         return NULL;

  1845. 

  1846.     for (i = 0; i < a->length; i++)

  1847.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1848.     for (i = 0; i < b->length; i++)

  1849.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1850. 

  1851.     return vec;

  1852. }

  1853. 

  1854. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1855. {

  1856.     int length = FFMAX(a->length, b->length);

  1857.     int i;

  1858.     SwsVector *vec = sws_getConstVec(0.0, length);

  1859. 

  1860.     if (!vec)

  1861.         return NULL;

  1862. 

  1863.     for (i = 0; i < a->length; i++)

  1864.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1865.     for (i = 0; i < b->length; i++)

  1866.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1867. 

  1868.     return vec;

  1869. }

  1870. 

  1871. /* shift left / or right if "shift" is negative */

  1872. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1873. {

  1874.     int length = a->length + FFABS(shift) * 2;

  1875.     int i;

  1876.     SwsVector *vec = sws_getConstVec(0.0, length);

  1877. 

  1878.     if (!vec)

  1879.         return NULL;

  1880. 

  1881.     for (i = 0; i < a->length; i++) {

  1882.         vec->coeff[i + (length    - 1) / 2 -

  1883.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1884.     }

  1885. 

  1886.     return vec;

  1887. }

  1888. 

  1889. void sws_shiftVec(SwsVector *a, int shift)

  1890. {

  1891.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1892.     av_free(a->coeff);

  1893.     a->coeff  = shifted->coeff;

  1894.     a->length = shifted->length;

  1895.     av_free(shifted);

  1896. }

  1897. 

  1898. void sws_addVec(SwsVector *a, SwsVector *b)

  1899. {

  1900.     SwsVector *sum = sws_sumVec(a, b);

  1901.     av_free(a->coeff);

  1902.     a->coeff  = sum->coeff;

  1903.     a->length = sum->length;

  1904.     av_free(sum);

  1905. }

  1906. 

  1907. void sws_subVec(SwsVector *a, SwsVector *b)

  1908. {

  1909.     SwsVector *diff = sws_diffVec(a, b);

  1910.     av_free(a->coeff);

  1911.     a->coeff  = diff->coeff;

  1912.     a->length = diff->length;

  1913.     av_free(diff);

  1914. }

  1915. 

  1916. void sws_convVec(SwsVector *a, SwsVector *b)

  1917. {

  1918.     SwsVector *conv = sws_getConvVec(a, b);

  1919.     av_free(a->coeff);

  1920.     a->coeff  = conv->coeff;

  1921.     a->length = conv->length;

  1922.     av_free(conv);

  1923. }

  1924. 

  1925. SwsVector *sws_cloneVec(SwsVector *a)

  1926. {

  1927.     SwsVector *vec = sws_allocVec(a->length);

  1928. 

  1929.     if (!vec)

  1930.         return NULL;

  1931. 

  1932.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  1933. 

  1934.     return vec;

  1935. }

  1936. 

  1937. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1938. {

  1939.     int i;

  1940.     double max = 0;

  1941.     double min = 0;

  1942.     double range;

  1943. 

  1944.     for (i = 0; i < a->length; i++)

  1945.         if (a->coeff[i] > max)

  1946.             max = a->coeff[i];

  1947. 

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

  1949.         if (a->coeff[i] < min)

  1950.             min = a->coeff[i];

  1951. 

  1952.     range = max - min;

  1953. 

  1954.     for (i = 0; i < a->length; i++) {

  1955.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1956.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1957.         for (; x > 0; x--)

  1958.             av_log(log_ctx, log_level, " ");

  1959.         av_log(log_ctx, log_level, "|\n");

  1960.     }

  1961. }

  1962. 

  1963. void sws_freeVec(SwsVector *a)

  1964. {

  1965.     if (!a)

  1966.         return;

  1967.     av_freep(&a->coeff);

  1968.     a->length = 0;

  1969.     av_free(a);

  1970. }

  1971. 

  1972. void sws_freeFilter(SwsFilter *filter)

  1973. {

  1974.     if (!filter)

  1975.         return;

  1976. 

  1977.     sws_freeVec(filter->lumH);

  1978.     sws_freeVec(filter->lumV);

  1979.     sws_freeVec(filter->chrH);

  1980.     sws_freeVec(filter->chrV);

  1981.     av_free(filter);

  1982. }

  1983. 

  1984. void sws_freeContext(SwsContext *c)

  1985. {

  1986.     int i;

  1987.     if (!c)

  1988.         return;

  1989. 

  1990.     if (c->lumPixBuf) {

  1991.         for (i = 0; i < c->vLumBufSize; i++)

  1992.             av_freep(&c->lumPixBuf[i]);

  1993.         av_freep(&c->lumPixBuf);

  1994.     }

  1995. 

  1996.     if (c->chrUPixBuf) {

  1997.         for (i = 0; i < c->vChrBufSize; i++)

  1998.             av_freep(&c->chrUPixBuf[i]);

  1999.         av_freep(&c->chrUPixBuf);

  2000.         av_freep(&c->chrVPixBuf);

  2001.     }

  2002. 

  2003.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2004.         for (i = 0; i < c->vLumBufSize; i++)

  2005.             av_freep(&c->alpPixBuf[i]);

  2006.         av_freep(&c->alpPixBuf);

  2007.     }

  2008. 

  2009.     for (i = 0; i < 4; i++)

  2010.         av_freep(&c->dither_error[i]);

  2011. 

  2012.     av_freep(&c->vLumFilter);

  2013.     av_freep(&c->vChrFilter);

  2014.     av_freep(&c->hLumFilter);

  2015.     av_freep(&c->hChrFilter);

  2016. #if HAVE_ALTIVEC

  2017.     av_freep(&c->vYCoeffsBank);

  2018.     av_freep(&c->vCCoeffsBank);

  2019. #endif

  2020. 

  2021.     av_freep(&c->vLumFilterPos);

  2022.     av_freep(&c->vChrFilterPos);

  2023.     av_freep(&c->hLumFilterPos);

  2024.     av_freep(&c->hChrFilterPos);

  2025. 

  2026. #if HAVE_MMX_INLINE

  2027. #if USE_MMAP

  2028.     if (c->lumMmxextFilterCode)

  2029.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2030.     if (c->chrMmxextFilterCode)

  2031.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2032. #elif HAVE_VIRTUALALLOC

  2033.     if (c->lumMmxextFilterCode)

  2034.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2035.     if (c->chrMmxextFilterCode)

  2036.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2037. #else

  2038.     av_free(c->lumMmxextFilterCode);

  2039.     av_free(c->chrMmxextFilterCode);

  2040. #endif

  2041.     c->lumMmxextFilterCode = NULL;

  2042.     c->chrMmxextFilterCode = NULL;

  2043. #endif /* HAVE_MMX_INLINE */

  2044. 

  2045.     av_freep(&c->yuvTable);

  2046.     av_freep(&c->formatConvBuffer);

  2047. 

  2048.     sws_freeContext(c->cascaded_context[0]);

  2049.     sws_freeContext(c->cascaded_context[1]);

  2050.     sws_freeContext(c->cascaded_context[2]);

  2051.     memset(c->cascaded_context, 0, sizeof(c->cascaded_context));

  2052.     av_freep(&c->cascaded_tmp[0]);

  2053.     av_freep(&c->cascaded1_tmp[0]);

  2054. 

  2055.     av_freep(&c->gamma);

  2056.     av_freep(&c->inv_gamma);

  2057. 

  2058. 

  2059.     av_free(c);

  2060. }

  2061. 

  2062. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2063.                                         int srcH, enum AVPixelFormat srcFormat,

  2064.                                         int dstW, int dstH,

  2065.                                         enum AVPixelFormat dstFormat, int flags,

  2066.                                         SwsFilter *srcFilter,

  2067.                                         SwsFilter *dstFilter,

  2068.                                         const double *param)

  2069. {

  2070.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2071.                                              SWS_PARAM_DEFAULT };

  2072.     int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,

  2073.             src_v_chr_pos = -513, dst_v_chr_pos = -513;

  2074. 

  2075.     if (!param)

  2076.         param = default_param;

  2077. 

  2078.     if (context &&

  2079.         (context->srcW      != srcW      ||

  2080.          context->srcH      != srcH      ||

  2081.          context->srcFormat != srcFormat ||

  2082.          context->dstW      != dstW      ||

  2083.          context->dstH      != dstH      ||

  2084.          context->dstFormat != dstFormat ||

  2085.          context->flags     != flags     ||

  2086.          context->param[0]  != param[0]  ||

  2087.          context->param[1]  != param[1])) {

  2088. 

  2089.         av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);

  2090.         av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);

  2091.         av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);

  2092.         av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);

  2093.         sws_freeContext(context);

  2094.         context = NULL;

  2095.     }

  2096. 

  2097.     if (!context) {

  2098.         if (!(context = sws_alloc_context()))

  2099.             return NULL;

  2100.         context->srcW      = srcW;

  2101.         context->srcH      = srcH;

  2102.         context->srcFormat = srcFormat;

  2103.         context->dstW      = dstW;

  2104.         context->dstH      = dstH;

  2105.         context->dstFormat = dstFormat;

  2106.         context->flags     = flags;

  2107.         context->param[0]  = param[0];

  2108.         context->param[1]  = param[1];

  2109. 

  2110.         av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);

  2111.         av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);

  2112.         av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);

  2113.         av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);

  2114. 

  2115.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2116.             sws_freeContext(context);

  2117.             return NULL;

  2118.         }

  2119.     }

  2120.     return context;

  2121. }