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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

  6.  * FFmpeg is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * FFmpeg is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with FFmpeg; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

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

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

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

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

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

  52. #include "rgb2rgb.h"

  53. #include "swscale.h"

  54. #include "swscale_internal.h"

  55. 

  56. static void handle_formats(SwsContext *c);

  57. 

  58. unsigned swscale_version(void)

  59. {

  60.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  61.     return LIBSWSCALE_VERSION_INT;

  62. }

  63. 

  64. const char *swscale_configuration(void)

  65. {

  66.     return FFMPEG_CONFIGURATION;

  67. }

  68. 

  69. const char *swscale_license(void)

  70. {

  71. #define LICENSE_PREFIX "libswscale license: "

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

  73. }

  74. 

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

  76. 

  77. typedef struct FormatEntry {

  78.     uint8_t is_supported_in         :1;

  79.     uint8_t is_supported_out        :1;

  80.     uint8_t is_supported_endianness :1;

  81. } FormatEntry;

  82. 

  83. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  100.     [AV_PIX_FMT_YVYU422]     = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  223. };

  224. 

  225. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  226. {

  227.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  228.            format_entries[pix_fmt].is_supported_in : 0;

  229. }

  230. 

  231. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  232. {

  233.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  234.            format_entries[pix_fmt].is_supported_out : 0;

  235. }

  236. 

  237. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  238. {

  239.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  240.            format_entries[pix_fmt].is_supported_endianness : 0;

  241. }

  242. 

  243. #if FF_API_SWS_FORMAT_NAME

  244. const char *sws_format_name(enum AVPixelFormat format)

  245. {

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

  247.     if (desc)

  248.         return desc->name;

  249.     else

  250.         return "Unknown format";

  251. }

  252. #endif

  253. 

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

  255.                              double dist)

  256. {

  257.     if (dist <= 1.0)

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

  259.     else

  260.         return getSplineCoeff(0.0,

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

  262.                                c + 3.0 * d,

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

  264.                               dist - 1.0);

  265. }

  266. 

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

  268. {

  269.     if (pos < 0) {

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

  271.     }

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

  273.     return pos >> chr_subsample;

  274. }

  275. 

  276. typedef struct {

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

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

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

  280. } ScaleAlgorithm;

  281. 

  282. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  294. };

  295. 

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

  297.                               int *outFilterSize, int xInc, int srcW,

  298.                               int dstW, int filterAlign, int one,

  299.                               int flags, int cpu_flags,

  300.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  302. {

  303.     int i;

  304.     int filterSize;

  305.     int filter2Size;

  306.     int minFilterSize;

  307.     int64_t *filter    = NULL;

  308.     int64_t *filter2   = NULL;

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

  310.     int ret            = -1;

  311. 

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

  313. 

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

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

  316. 

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

  318.         int i;

  319.         filterSize = 1;

  320.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  322. 

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

  324.             filter[i * filterSize] = fone;

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

  326.         }

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

  328.         int i;

  329.         int64_t xDstInSrc;

  330.         filterSize = 1;

  331.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  333. 

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

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

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

  337. 

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

  339.             filter[i]       = fone;

  340.             xDstInSrc      += xInc;

  341.         }

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

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

  344.         int i;

  345.         int64_t xDstInSrc;

  346.         filterSize = 2;

  347.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  349. 

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

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

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

  353.             int j;

  354. 

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

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

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

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

  359.                 if (coeff < 0)

  360.                     coeff = 0;

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

  362.                 xx++;

  363.             }

  364.             xDstInSrc += xInc;

  365.         }

  366.     } else {

  367.         int64_t xDstInSrc;

  368.         int sizeFactor = -1;

  369. 

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

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

  372.                 sizeFactor = scale_algorithms[i].size_factor;

  373.                 break;

  374.             }

  375.         }

  376.         if (flags & SWS_LANCZOS)

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

  378.         av_assert0(sizeFactor > 0);

  379. 

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

  381.             filterSize = 1 + sizeFactor;    // upscale

  382.         else

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

  384. 

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

  386.         filterSize = FFMAX(filterSize, 1);

  387. 

  388.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  390. 

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

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

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

  394.             int j;

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

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

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

  398.                 double floatd;

  399.                 int64_t coeff;

  400. 

  401.                 if (xInc > 1 << 16)

  402.                     d = d * dstW / srcW;

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

  404. 

  405.                 if (flags & SWS_BICUBIC) {

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

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

  408. 

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

  410.                         coeff = 0.0;

  411.                     } else {

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

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

  414. 

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

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

  417.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  418.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  419.                         else

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

  421.                                       (6 * B + 30 * C) * dd  +

  422.                                     (-12 * B - 48 * C) * d   +

  423.                                       (8 * B + 24 * C) * (1 << 30);

  424.                     }

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

  426.                 }

  427. #if 0

  428.                 else if (flags & SWS_X) {

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

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

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

  432.                 }

  433. #endif

  434.                 else if (flags & SWS_X) {

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

  436.                     double c;

  437. 

  438.                     if (floatd < 1.0)

  439.                         c = cos(floatd * M_PI);

  440.                     else

  441.                         c = -1.0;

  442.                     if (c < 0.0)

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

  444.                     else

  445.                         c = pow(c, A);

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

  447.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  453.                     else

  454.                         coeff = 0.0;

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

  456.                 } else if (flags & SWS_GAUSS) {

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

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

  459.                 } else if (flags & SWS_SINC) {

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

  461.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  465.                     if (floatd > p)

  466.                         coeff = 0;

  467.                 } else if (flags & SWS_BILINEAR) {

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

  469.                     if (coeff < 0)

  470.                         coeff = 0;

  471.                     coeff *= fone >> 30;

  472.                 } else if (flags & SWS_SPLINE) {

  473.                     double p = -2.196152422706632;

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

  475.                 } else {

  476.                     av_assert0(0);

  477.                 }

  478. 

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

  480.                 xx++;

  481.             }

  482.             xDstInSrc += 2 * xInc;

  483.         }

  484.     }

  485. 

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

  487.      * av_free(filter);

  488.      */

  489.     av_assert0(filterSize > 0);

  490.     filter2Size = filterSize;

  491.     if (srcFilter)

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

  493.     if (dstFilter)

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

  495.     av_assert0(filter2Size > 0);

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

  497. 

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

  499.         int j, k;

  500. 

  501.         if (srcFilter) {

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

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

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

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

  506.             }

  507.         } else {

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

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

  510.         }

  511.         // FIXME dstFilter

  512. 

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

  514.     }

  515.     av_freep(&filter);

  516. 

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

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

  519.     minFilterSize = 0;

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

  521.         int min = filter2Size;

  522.         int j;

  523.         int64_t cutOff = 0.0;

  524. 

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

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

  527.             int k;

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

  529. 

  530.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  531.                 break;

  532. 

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

  534.              * filter otherwise */

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

  536.                 break;

  537. 

  538.             // move filter coefficients left

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

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

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

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

  543.         }

  544. 

  545.         cutOff = 0;

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

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

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

  549. 

  550.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  551.                 break;

  552.             min--;

  553.         }

  554. 

  555.         if (min > minFilterSize)

  556.             minFilterSize = min;

  557.     }

  558. 

  559.     if (PPC_ALTIVEC(cpu_flags)) {

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

  561.         if (minFilterSize < 5)

  562.             filterAlign = 4;

  563. 

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

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

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

  567.         if (minFilterSize < 3)

  568.             filterAlign = 1;

  569.     }

  570. 

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

  572.         // special case for unscaled vertical filtering

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

  574.             filterAlign = 1;

  575.     }

  576. 

  577.     av_assert0(minFilterSize > 0);

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

  579.     av_assert0(filterSize > 0);

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

  581.     if (!filter)

  582.         goto fail;

  583.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  585.         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreme scaling or set --sws-max-filter-size and recompile\n",

  586.                FF_CEIL_RSHIFT((filterSize+1) * ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16), 4));

  587.         goto fail;

  588.     }

  589.     *outFilterSize = filterSize;

  590. 

  591.     if (flags & SWS_PRINT_INFO)

  592.         av_log(NULL, AV_LOG_VERBOSE,

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

  594.                filter2Size, filterSize);

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

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

  597.         int j;

  598. 

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

  600.             if (j >= filter2Size)

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

  602.             else

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

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

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

  606.         }

  607.     }

  608. 

  609.     // FIXME try to align filterPos if possible

  610. 

  611.     // fix borders

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

  613.         int j;

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

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

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

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

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

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

  620.             }

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

  622.         }

  623. 

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

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

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

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

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

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

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

  631.             }

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

  633.         }

  634.     }

  635. 

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

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

  638.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  640. 

  641.     /* normalize & store in outFilter */

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

  643.         int j;

  644.         int64_t error = 0;

  645.         int64_t sum   = 0;

  646. 

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

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

  649.         }

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

  651.         if (!sum) {

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

  653.             sum = 1;

  654.         }

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

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

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

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

  659.             error                                  = v - intV * sum;

  660.         }

  661.     }

  662. 

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

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

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

  666.                                                       * read over the end */

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

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

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

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

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

  672.     }

  673. 

  674.     ret = 0;

  675. 

  676. fail:

  677.     if(ret < 0)

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

  679.     av_free(filter);

  680.     av_free(filter2);

  681.     return ret;

  682. }

  683. 

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

  685. {

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

  687.     int64_t vr =  table[0];

  688.     int64_t ub =  table[1];

  689.     int64_t ug = -table[2];

  690.     int64_t vg = -table[3];

  691.     int64_t ONE = 65536;

  692.     int64_t cy = ONE;

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

  694.     int i;

  695.     static const int8_t map[] = {

  696.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  697.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  698.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  699.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  700.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  701.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  702.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  703.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  704.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  705.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  706.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  707.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  708.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  709.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

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

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

  712.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  713.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

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

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

  716.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  717.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

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

  719.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  720.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  721.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  722.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  723.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  724.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  725.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  726.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  727.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  731.     };

  732. 

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

  734. 

  735.     if (!dstRange) {

  736.         cy = cy * 255 / 219;

  737.     } else {

  738.         vr = vr * 224 / 255;

  739.         ub = ub * 224 / 255;

  740.         ug = ug * 224 / 255;

  741.         vg = vg * 224 / 255;

  742.     }

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

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

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

  746. 

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

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

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

  750. 

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

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

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

  754. 

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

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

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

  758. 

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

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

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

  762. 

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

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

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

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

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

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

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

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

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

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

  773.     }

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

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

  776. }

  777. 

  778. static void fill_xyztables(struct SwsContext *c)

  779. {

  780.     int i;

  781.     double xyzgamma = XYZ_GAMMA;

  782.     double rgbgamma = 1.0 / RGB_GAMMA;

  783.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  784.     double rgbgammainv = RGB_GAMMA;

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

  786.         {13270, -6295, -2041},

  787.         {-3969,  7682,   170},

  788.         {  228,  -835,  4329} };

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

  790.         {1689, 1464,  739},

  791.         { 871, 2929,  296},

  792.         {  79,  488, 3891} };

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

  794. 

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

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

  797.     c->xyzgamma = xyzgamma_tab;

  798.     c->rgbgamma = rgbgamma_tab;

  799.     c->xyzgammainv = xyzgammainv_tab;

  800.     c->rgbgammainv = rgbgammainv_tab;

  801. 

  802.     if (rgbgamma_tab[4095])

  803.         return;

  804. 

  805.     /* set gamma vectors */

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

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

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

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

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

  811.     }

  812. }

  813. 

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

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

  816.                              int brightness, int contrast, int saturation)

  817. {

  818.     const AVPixFmtDescriptor *desc_dst;

  819.     const AVPixFmtDescriptor *desc_src;

  820.     int need_reinit = 0;

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

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

  823. 

  824.     handle_formats(c);

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

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

  827. 

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

  829.         dstRange = 0;

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

  831.         srcRange = 0;

  832. 

  833.     c->brightness = brightness;

  834.     c->contrast   = contrast;

  835.     c->saturation = saturation;

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

  837.         need_reinit = 1;

  838.     c->srcRange   = srcRange;

  839.     c->dstRange   = dstRange;

  840. 

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

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

  843.     if (need_reinit && c->srcBpc == 8)

  844.         ff_sws_init_range_convert(c);

  845. 

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

  847.         return -1;

  848. 

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

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

  851. 

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

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

  854.                                  contrast, saturation);

  855.         // FIXME factorize

  856. 

  857.         if (ARCH_PPC)

  858.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  859.                                        contrast, saturation);

  860.     }

  861. 

  862.     fill_rgb2yuv_table(c, table, dstRange);

  863. 

  864.     return 0;

  865. }

  866. 

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

  868.                              int *srcRange, int **table, int *dstRange,

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

  870. {

  871.     if (!c )

  872.         return -1;

  873. 

  874.     *inv_table  = c->srcColorspaceTable;

  875.     *table      = c->dstColorspaceTable;

  876.     *srcRange   = c->srcRange;

  877.     *dstRange   = c->dstRange;

  878.     *brightness = c->brightness;

  879.     *contrast   = c->contrast;

  880.     *saturation = c->saturation;

  881. 

  882.     return 0;

  883. }

  884. 

  885. static int handle_jpeg(enum AVPixelFormat *format)

  886. {

  887.     switch (*format) {

  888.     case AV_PIX_FMT_YUVJ420P:

  889.         *format = AV_PIX_FMT_YUV420P;

  890.         return 1;

  891.     case AV_PIX_FMT_YUVJ411P:

  892.         *format = AV_PIX_FMT_YUV411P;

  893.         return 1;

  894.     case AV_PIX_FMT_YUVJ422P:

  895.         *format = AV_PIX_FMT_YUV422P;

  896.         return 1;

  897.     case AV_PIX_FMT_YUVJ444P:

  898.         *format = AV_PIX_FMT_YUV444P;

  899.         return 1;

  900.     case AV_PIX_FMT_YUVJ440P:

  901.         *format = AV_PIX_FMT_YUV440P;

  902.         return 1;

  903.     case AV_PIX_FMT_GRAY8:

  904.     case AV_PIX_FMT_GRAY16LE:

  905.     case AV_PIX_FMT_GRAY16BE:

  906.         return 1;

  907.     default:

  908.         return 0;

  909.     }

  910. }

  911. 

  912. static int handle_0alpha(enum AVPixelFormat *format)

  913. {

  914.     switch (*format) {

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

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

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

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

  919.     default:                                          return 0;

  920.     }

  921. }

  922. 

  923. static int handle_xyz(enum AVPixelFormat *format)

  924. {

  925.     switch (*format) {

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

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

  928.     default:                                                return 0;

  929.     }

  930. }

  931. 

  932. static void handle_formats(SwsContext *c)

  933. {

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

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

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

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

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

  939.         fill_xyztables(c);

  940. }

  941. 

  942. SwsContext *sws_alloc_context(void)

  943. {

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

  945. 

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

  947. 

  948.     if (c) {

  949.         c->av_class = &sws_context_class;

  950.         av_opt_set_defaults(c);

  951.     }

  952. 

  953.     return c;

  954. }

  955. 

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

  957.                              SwsFilter *dstFilter)

  958. {

  959.     int i, j;

  960.     int usesVFilter, usesHFilter;

  961.     int unscaled;

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

  963.     int srcW              = c->srcW;

  964.     int srcH              = c->srcH;

  965.     int dstW              = c->dstW;

  966.     int dstH              = c->dstH;

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

  968.     int flags, cpu_flags;

  969.     enum AVPixelFormat srcFormat = c->srcFormat;

  970.     enum AVPixelFormat dstFormat = c->dstFormat;

  971.     const AVPixFmtDescriptor *desc_src;

  972.     const AVPixFmtDescriptor *desc_dst;

  973. 

  974.     cpu_flags = av_get_cpu_flags();

  975.     flags     = c->flags;

  976.     emms_c();

  977.     if (!rgb15to16)

  978.         sws_rgb2rgb_init();

  979. 

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

  981. 

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

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

  984. 

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

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

  987. 

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

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

  990.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

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

  992. 

  993.     handle_formats(c);

  994.     srcFormat = c->srcFormat;

  995.     dstFormat = c->dstFormat;

  996.     desc_src = av_pix_fmt_desc_get(srcFormat);

  997.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  998. 

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

  1000.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1001.     if (!sws_isSupportedInput(srcFormat)) {

  1002.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1003.                av_get_pix_fmt_name(srcFormat));

  1004.         return AVERROR(EINVAL);

  1005.     }

  1006.     if (!sws_isSupportedOutput(dstFormat)) {

  1007.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1008.                av_get_pix_fmt_name(dstFormat));

  1009.         return AVERROR(EINVAL);

  1010.     }

  1011.     }

  1012. 

  1013.     i = flags & (SWS_POINT         |

  1014.                  SWS_AREA          |

  1015.                  SWS_BILINEAR      |

  1016.                  SWS_FAST_BILINEAR |

  1017.                  SWS_BICUBIC       |

  1018.                  SWS_X             |

  1019.                  SWS_GAUSS         |

  1020.                  SWS_LANCZOS       |

  1021.                  SWS_SINC          |

  1022.                  SWS_SPLINE        |

  1023.                  SWS_BICUBLIN);

  1024. 

  1025.     /* provide a default scaler if not set by caller */

  1026.     if (!i) {

  1027.         if (dstW < srcW && dstH < srcH)

  1028.             flags |= SWS_BICUBIC;

  1029.         else if (dstW > srcW && dstH > srcH)

  1030.             flags |= SWS_BICUBIC;

  1031.         else

  1032.             flags |= SWS_BICUBIC;

  1033.         c->flags = flags;

  1034.     } else if (i & (i - 1)) {

  1035.         av_log(c, AV_LOG_ERROR,

  1036.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1037.         return AVERROR(EINVAL);

  1038.     }

  1039.     /* sanity check */

  1040.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1041.         /* FIXME check if these are enough and try to lower them after

  1042.          * fixing the relevant parts of the code */

  1043.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1044.                srcW, srcH, dstW, dstH);

  1045.         return AVERROR(EINVAL);

  1046.     }

  1047. 

  1048.     if (!dstFilter)

  1049.         dstFilter = &dummyFilter;

  1050.     if (!srcFilter)

  1051.         srcFilter = &dummyFilter;

  1052. 

  1053.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1054.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1055.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1056.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1057.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1058. 

  1059.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1060.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1061.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1062.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1063.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1064.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1065.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1066.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1067. 

  1068.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1069.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1070. 

  1071.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1072.         if (dstW&1) {

  1073.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1074.             flags |= SWS_FULL_CHR_H_INT;

  1075.             c->flags = flags;

  1076.         }

  1077. 

  1078.         if (   c->chrSrcHSubSample == 0

  1079.             && c->chrSrcVSubSample == 0

  1080.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1081.             && !(c->flags & SWS_FAST_BILINEAR)

  1082.         ) {

  1083.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1084.             flags |= SWS_FULL_CHR_H_INT;

  1085.             c->flags = flags;

  1086.         }

  1087.     }

  1088. 

  1089.     if (c->dither == SWS_DITHER_AUTO) {

  1090.         if (flags & SWS_ERROR_DIFFUSION)

  1091.             c->dither = SWS_DITHER_ED;

  1092.     }

  1093. 

  1094.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1095.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1096.        dstFormat == AV_PIX_FMT_BGR8 ||

  1097.        dstFormat == AV_PIX_FMT_RGB8) {

  1098.         if (c->dither == SWS_DITHER_AUTO)

  1099.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1100.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1101.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1102.                 av_log(c, AV_LOG_DEBUG,

  1103.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1104.                     av_get_pix_fmt_name(dstFormat));

  1105.                 flags   |= SWS_FULL_CHR_H_INT;

  1106.                 c->flags = flags;

  1107.             }

  1108.         }

  1109.         if (flags & SWS_FULL_CHR_H_INT) {

  1110.             if (c->dither == SWS_DITHER_BAYER) {

  1111.                 av_log(c, AV_LOG_DEBUG,

  1112.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1113.                     av_get_pix_fmt_name(dstFormat));

  1114.                 c->dither = SWS_DITHER_ED;

  1115.             }

  1116.         }

  1117.     }

  1118.     if (isPlanarRGB(dstFormat)) {

  1119.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1120.             av_log(c, AV_LOG_DEBUG,

  1121.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1122.                    av_get_pix_fmt_name(dstFormat));

  1123.             flags   |= SWS_FULL_CHR_H_INT;

  1124.             c->flags = flags;

  1125.         }

  1126.     }

  1127. 

  1128.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1129.      * chroma interpolation */

  1130.     if (flags & SWS_FULL_CHR_H_INT &&

  1131.         isAnyRGB(dstFormat)        &&

  1132.         !isPlanarRGB(dstFormat)    &&

  1133.         dstFormat != AV_PIX_FMT_RGBA  &&

  1134.         dstFormat != AV_PIX_FMT_ARGB  &&

  1135.         dstFormat != AV_PIX_FMT_BGRA  &&

  1136.         dstFormat != AV_PIX_FMT_ABGR  &&

  1137.         dstFormat != AV_PIX_FMT_RGB24 &&

  1138.         dstFormat != AV_PIX_FMT_BGR24 &&

  1139.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1140.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1141.         dstFormat != AV_PIX_FMT_BGR8 &&

  1142.         dstFormat != AV_PIX_FMT_RGB8

  1143.     ) {

  1144.         av_log(c, AV_LOG_WARNING,

  1145.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1146.                av_get_pix_fmt_name(dstFormat));

  1147.         flags   &= ~SWS_FULL_CHR_H_INT;

  1148.         c->flags = flags;

  1149.     }

  1150.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1151.         c->chrDstHSubSample = 1;

  1152. 

  1153.     // drop some chroma lines if the user wants it

  1154.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1155.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1156.     c->chrSrcVSubSample += c->vChrDrop;

  1157. 

  1158.     /* drop every other pixel for chroma calculation unless user

  1159.      * wants full chroma */

  1160.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1161.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1162.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1163.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1164.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1165.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1166.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1167.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1168.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1169.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1170.          (flags & SWS_FAST_BILINEAR)))

  1171.         c->chrSrcHSubSample = 1;

  1172. 

  1173.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1174.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1175.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1176.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1177.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1178. 

  1179.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1180. 

  1181.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1182.     if (c->srcBpc < 8)

  1183.         c->srcBpc = 8;

  1184.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1185.     if (c->dstBpc < 8)

  1186.         c->dstBpc = 8;

  1187.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1188.         c->srcBpc = 16;

  1189.     if (c->dstBpc == 16)

  1190.         dst_stride <<= 1;

  1191. 

  1192.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1193.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1194.                              c->chrDstW >= c->chrSrcW &&

  1195.                              (srcW & 15) == 0;

  1196.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1197. 

  1198.             && (flags & SWS_FAST_BILINEAR)) {

  1199.             if (flags & SWS_PRINT_INFO)

  1200.                 av_log(c, AV_LOG_INFO,

  1201.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1202.         }

  1203.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1204.             c->canMMXEXTBeUsed = 0;

  1205.     } else

  1206.         c->canMMXEXTBeUsed = 0;

  1207. 

  1208.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1209.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1210. 

  1211.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1212.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1213.      * correct scaling.

  1214.      * n-2 is the last chrominance sample available.

  1215.      * This is not perfect, but no one should notice the difference, the more

  1216.      * correct variant would be like the vertical one, but that would require

  1217.      * some special code for the first and last pixel */

  1218.     if (flags & SWS_FAST_BILINEAR) {

  1219.         if (c->canMMXEXTBeUsed) {

  1220.             c->lumXInc += 20;

  1221.             c->chrXInc += 20;

  1222.         }

  1223.         // we don't use the x86 asm scaler if MMX is available

  1224.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1225.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1226.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1227.         }

  1228.     }

  1229. 

  1230. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1231. 

  1232.     /* precalculate horizontal scaler filter coefficients */

  1233.     {

  1234. #if HAVE_MMXEXT_INLINE

  1235. // can't downscale !!!

  1236.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1237.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1238.                                                              NULL, NULL, 8);

  1239.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1240.                                                              NULL, NULL, NULL, 4);

  1241. 

  1242. #if USE_MMAP

  1243.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1244.                                           PROT_READ | PROT_WRITE,

  1245.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1246.                                           -1, 0);

  1247.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1248.                                           PROT_READ | PROT_WRITE,

  1249.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1250.                                           -1, 0);

  1251. #elif HAVE_VIRTUALALLOC

  1252.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1253.                                                   c->lumMmxextFilterCodeSize,

  1254.                                                   MEM_COMMIT,

  1255.                                                   PAGE_EXECUTE_READWRITE);

  1256.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1257.                                                   c->chrMmxextFilterCodeSize,

  1258.                                                   MEM_COMMIT,

  1259.                                                   PAGE_EXECUTE_READWRITE);

  1260. #else

  1261.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1262.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1263. #endif

  1264. 

  1265. #ifdef MAP_ANONYMOUS

  1266.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1267. #else

  1268.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1269. #endif

  1270.             {

  1271.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1272.                 return AVERROR(ENOMEM);

  1273.             }

  1274. 

  1275.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1276.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1277.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1278.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1279. 

  1280.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1281.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1282.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1283.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1284. 

  1285. #if USE_MMAP

  1286.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1287.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1288.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1289.                 goto fail;

  1290.             }

  1291. #endif

  1292.         } else

  1293. #endif /* HAVE_MMXEXT_INLINE */

  1294.         {

  1295.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1296.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1297. 

  1298.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1299.                            &c->hLumFilterSize, c->lumXInc,

  1300.                            srcW, dstW, filterAlign, 1 << 14,

  1301.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1302.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1303.                            c->param,

  1304.                            get_local_pos(c, 0, 0, 0),

  1305.                            get_local_pos(c, 0, 0, 0)) < 0)

  1306.                 goto fail;

  1307.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1308.                            &c->hChrFilterSize, c->chrXInc,

  1309.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1310.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1311.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1312.                            c->param,

  1313.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1314.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)

  1315.                 goto fail;

  1316.         }

  1317.     } // initialize horizontal stuff

  1318. 

  1319.     /* precalculate vertical scaler filter coefficients */

  1320.     {

  1321.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1322.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1323. 

  1324.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1325.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1326.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1327.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1328.                        c->param,

  1329.                        get_local_pos(c, 0, 0, 1),

  1330.                        get_local_pos(c, 0, 0, 1)) < 0)

  1331.             goto fail;

  1332.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1333.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1334.                        filterAlign, (1 << 12),

  1335.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1336.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1337.                        c->param,

  1338.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1339.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)

  1340. 

  1341.             goto fail;

  1342. 

  1343. #if HAVE_ALTIVEC

  1344.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1345.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1346. 

  1347.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1348.             int j;

  1349.             short *p = (short *)&c->vYCoeffsBank[i];

  1350.             for (j = 0; j < 8; j++)

  1351.                 p[j] = c->vLumFilter[i];

  1352.         }

  1353. 

  1354.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1355.             int j;

  1356.             short *p = (short *)&c->vCCoeffsBank[i];

  1357.             for (j = 0; j < 8; j++)

  1358.                 p[j] = c->vChrFilter[i];

  1359.         }

  1360. #endif

  1361.     }

  1362. 

  1363.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1364.     c->vLumBufSize = c->vLumFilterSize;

  1365.     c->vChrBufSize = c->vChrFilterSize;

  1366.     for (i = 0; i < dstH; i++) {

  1367.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1368.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1369.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1370.                                << c->chrSrcVSubSample));

  1371. 

  1372.         nextSlice >>= c->chrSrcVSubSample;

  1373.         nextSlice <<= c->chrSrcVSubSample;

  1374.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1375.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1376.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1377.             (nextSlice >> c->chrSrcVSubSample))

  1378.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1379.                              c->vChrFilterPos[chrI];

  1380.     }

  1381. 

  1382.     for (i = 0; i < 4; i++)

  1383.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1384. 

  1385.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1386.      * need to allocate several megabytes to handle all possible cases) */

  1387.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1388.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1389.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1390.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1391.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1392.     /* Note we need at least one pixel more at the end because of the MMX code

  1393.      * (just in case someone wants to replace the 4000/8000). */

  1394.     /* align at 16 bytes for AltiVec */

  1395.     for (i = 0; i < c->vLumBufSize; i++) {

  1396.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1397.                           dst_stride + 16, fail);

  1398.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1399.     }

  1400.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1401.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1402.     c->uv_offx2 = dst_stride + 16;

  1403.     for (i = 0; i < c->vChrBufSize; i++) {

  1404.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1405.                          dst_stride * 2 + 32, fail);

  1406.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1407.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1408.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1409.     }

  1410.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1411.         for (i = 0; i < c->vLumBufSize; i++) {

  1412.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1413.                               dst_stride + 16, fail);

  1414.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1415.         }

  1416. 

  1417.     // try to avoid drawing green stuff between the right end and the stride end

  1418.     for (i = 0; i < c->vChrBufSize; i++)

  1419.         if(desc_dst->comp[0].depth_minus1 == 15){

  1420.             av_assert0(c->dstBpc > 14);

  1421.             for(j=0; j<dst_stride/2+1; j++)

  1422.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1423.         } else

  1424.             for(j=0; j<dst_stride+1; j++)

  1425.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1426. 

  1427.     av_assert0(c->chrDstH <= dstH);

  1428. 

  1429.     if (flags & SWS_PRINT_INFO) {

  1430.         const char *scaler = NULL, *cpucaps;

  1431. 

  1432.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1433.             if (flags & scale_algorithms[i].flag) {

  1434.                 scaler = scale_algorithms[i].description;

  1435.                 break;

  1436.             }

  1437.         }

  1438.         if (!scaler)

  1439.             scaler =  "ehh flags invalid?!";

  1440.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1441.                scaler,

  1442.                av_get_pix_fmt_name(srcFormat),

  1443. #ifdef DITHER1XBPP

  1444.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1445.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1446.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1447.                                                              "dithered " : "",

  1448. #else

  1449.                "",

  1450. #endif

  1451.                av_get_pix_fmt_name(dstFormat));

  1452. 

  1453.         if (INLINE_MMXEXT(cpu_flags))

  1454.             cpucaps = "MMXEXT";

  1455.         else if (INLINE_AMD3DNOW(cpu_flags))

  1456.             cpucaps = "3DNOW";

  1457.         else if (INLINE_MMX(cpu_flags))

  1458.             cpucaps = "MMX";

  1459.         else if (PPC_ALTIVEC(cpu_flags))

  1460.             cpucaps = "AltiVec";

  1461.         else

  1462.             cpucaps = "C";

  1463. 

  1464.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1465. 

  1466.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1467.         av_log(c, AV_LOG_DEBUG,

  1468.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1469.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1470.         av_log(c, AV_LOG_DEBUG,

  1471.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1472.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1473.                c->chrXInc, c->chrYInc);

  1474.     }

  1475. 

  1476.     /* unscaled special cases */

  1477.     if (unscaled && !usesHFilter && !usesVFilter &&

  1478.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1479.         ff_get_unscaled_swscale(c);

  1480. 

  1481.         if (c->swscale) {

  1482.             if (flags & SWS_PRINT_INFO)

  1483.                 av_log(c, AV_LOG_INFO,

  1484.                        "using unscaled %s -> %s special converter\n",

  1485.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1486.             return 0;

  1487.         }

  1488.     }

  1489. 

  1490.     c->swscale = ff_getSwsFunc(c);

  1491.     return 0;

  1492. fail: // FIXME replace things by appropriate error codes

  1493.     return -1;

  1494. }

  1495. 

  1496. #if FF_API_SWS_GETCONTEXT

  1497. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1498.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1499.                            int flags, SwsFilter *srcFilter,

  1500.                            SwsFilter *dstFilter, const double *param)

  1501. {

  1502.     SwsContext *c;

  1503. 

  1504.     if (!(c = sws_alloc_context()))

  1505.         return NULL;

  1506. 

  1507.     c->flags     = flags;

  1508.     c->srcW      = srcW;

  1509.     c->srcH      = srcH;

  1510.     c->dstW      = dstW;

  1511.     c->dstH      = dstH;

  1512.     c->srcFormat = srcFormat;

  1513.     c->dstFormat = dstFormat;

  1514. 

  1515.     if (param) {

  1516.         c->param[0] = param[0];

  1517.         c->param[1] = param[1];

  1518.     }

  1519. 

  1520.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1521.         sws_freeContext(c);

  1522.         return NULL;

  1523.     }

  1524. 

  1525.     return c;

  1526. }

  1527. #endif

  1528. 

  1529. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1530.                                 float lumaSharpen, float chromaSharpen,

  1531.                                 float chromaHShift, float chromaVShift,

  1532.                                 int verbose)

  1533. {

  1534.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1535.     if (!filter)

  1536.         return NULL;

  1537. 

  1538.     if (lumaGBlur != 0.0) {

  1539.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1540.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1541.     } else {

  1542.         filter->lumH = sws_getIdentityVec();

  1543.         filter->lumV = sws_getIdentityVec();

  1544.     }

  1545. 

  1546.     if (chromaGBlur != 0.0) {

  1547.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1548.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1549.     } else {

  1550.         filter->chrH = sws_getIdentityVec();

  1551.         filter->chrV = sws_getIdentityVec();

  1552.     }

  1553. 

  1554.     if (chromaSharpen != 0.0) {

  1555.         SwsVector *id = sws_getIdentityVec();

  1556.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1557.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1558.         sws_addVec(filter->chrH, id);

  1559.         sws_addVec(filter->chrV, id);

  1560.         sws_freeVec(id);

  1561.     }

  1562. 

  1563.     if (lumaSharpen != 0.0) {

  1564.         SwsVector *id = sws_getIdentityVec();

  1565.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1566.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1567.         sws_addVec(filter->lumH, id);

  1568.         sws_addVec(filter->lumV, id);

  1569.         sws_freeVec(id);

  1570.     }

  1571. 

  1572.     if (chromaHShift != 0.0)

  1573.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1574. 

  1575.     if (chromaVShift != 0.0)

  1576.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1577. 

  1578.     sws_normalizeVec(filter->chrH, 1.0);

  1579.     sws_normalizeVec(filter->chrV, 1.0);

  1580.     sws_normalizeVec(filter->lumH, 1.0);

  1581.     sws_normalizeVec(filter->lumV, 1.0);

  1582. 

  1583.     if (verbose)

  1584.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1585.     if (verbose)

  1586.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1587. 

  1588.     return filter;

  1589. }

  1590. 

  1591. SwsVector *sws_allocVec(int length)

  1592. {

  1593.     SwsVector *vec;

  1594. 

  1595.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1596.         return NULL;

  1597. 

  1598.     vec = av_malloc(sizeof(SwsVector));

  1599.     if (!vec)

  1600.         return NULL;

  1601.     vec->length = length;

  1602.     vec->coeff  = av_malloc(sizeof(double) * length);

  1603.     if (!vec->coeff)

  1604.         av_freep(&vec);

  1605.     return vec;

  1606. }

  1607. 

  1608. SwsVector *sws_getGaussianVec(double variance, double quality)

  1609. {

  1610.     const int length = (int)(variance * quality + 0.5) | 1;

  1611.     int i;

  1612.     double middle  = (length - 1) * 0.5;

  1613.     SwsVector *vec;

  1614. 

  1615.     if(variance < 0 || quality < 0)

  1616.         return NULL;

  1617. 

  1618.     vec = sws_allocVec(length);

  1619. 

  1620.     if (!vec)

  1621.         return NULL;

  1622. 

  1623.     for (i = 0; i < length; i++) {

  1624.         double dist = i - middle;

  1625.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1626.                         sqrt(2 * variance * M_PI);

  1627.     }

  1628. 

  1629.     sws_normalizeVec(vec, 1.0);

  1630. 

  1631.     return vec;

  1632. }

  1633. 

  1634. SwsVector *sws_getConstVec(double c, int length)

  1635. {

  1636.     int i;

  1637.     SwsVector *vec = sws_allocVec(length);

  1638. 

  1639.     if (!vec)

  1640.         return NULL;

  1641. 

  1642.     for (i = 0; i < length; i++)

  1643.         vec->coeff[i] = c;

  1644. 

  1645.     return vec;

  1646. }

  1647. 

  1648. SwsVector *sws_getIdentityVec(void)

  1649. {

  1650.     return sws_getConstVec(1.0, 1);

  1651. }

  1652. 

  1653. static double sws_dcVec(SwsVector *a)

  1654. {

  1655.     int i;

  1656.     double sum = 0;

  1657. 

  1658.     for (i = 0; i < a->length; i++)

  1659.         sum += a->coeff[i];

  1660. 

  1661.     return sum;

  1662. }

  1663. 

  1664. void sws_scaleVec(SwsVector *a, double scalar)

  1665. {

  1666.     int i;

  1667. 

  1668.     for (i = 0; i < a->length; i++)

  1669.         a->coeff[i] *= scalar;

  1670. }

  1671. 

  1672. void sws_normalizeVec(SwsVector *a, double height)

  1673. {

  1674.     sws_scaleVec(a, height / sws_dcVec(a));

  1675. }

  1676. 

  1677. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1678. {

  1679.     int length = a->length + b->length - 1;

  1680.     int i, j;

  1681.     SwsVector *vec = sws_getConstVec(0.0, length);

  1682. 

  1683.     if (!vec)

  1684.         return NULL;

  1685. 

  1686.     for (i = 0; i < a->length; i++) {

  1687.         for (j = 0; j < b->length; j++) {

  1688.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1689.         }

  1690.     }

  1691. 

  1692.     return vec;

  1693. }

  1694. 

  1695. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1696. {

  1697.     int length = FFMAX(a->length, b->length);

  1698.     int i;

  1699.     SwsVector *vec = sws_getConstVec(0.0, length);

  1700. 

  1701.     if (!vec)

  1702.         return NULL;

  1703. 

  1704.     for (i = 0; i < a->length; i++)

  1705.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1706.     for (i = 0; i < b->length; i++)

  1707.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1708. 

  1709.     return vec;

  1710. }

  1711. 

  1712. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1713. {

  1714.     int length = FFMAX(a->length, b->length);

  1715.     int i;

  1716.     SwsVector *vec = sws_getConstVec(0.0, length);

  1717. 

  1718.     if (!vec)

  1719.         return NULL;

  1720. 

  1721.     for (i = 0; i < a->length; i++)

  1722.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1723.     for (i = 0; i < b->length; i++)

  1724.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1725. 

  1726.     return vec;

  1727. }

  1728. 

  1729. /* shift left / or right if "shift" is negative */

  1730. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1731. {

  1732.     int length = a->length + FFABS(shift) * 2;

  1733.     int i;

  1734.     SwsVector *vec = sws_getConstVec(0.0, length);

  1735. 

  1736.     if (!vec)

  1737.         return NULL;

  1738. 

  1739.     for (i = 0; i < a->length; i++) {

  1740.         vec->coeff[i + (length    - 1) / 2 -

  1741.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1742.     }

  1743. 

  1744.     return vec;

  1745. }

  1746. 

  1747. void sws_shiftVec(SwsVector *a, int shift)

  1748. {

  1749.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1750.     av_free(a->coeff);

  1751.     a->coeff  = shifted->coeff;

  1752.     a->length = shifted->length;

  1753.     av_free(shifted);

  1754. }

  1755. 

  1756. void sws_addVec(SwsVector *a, SwsVector *b)

  1757. {

  1758.     SwsVector *sum = sws_sumVec(a, b);

  1759.     av_free(a->coeff);

  1760.     a->coeff  = sum->coeff;

  1761.     a->length = sum->length;

  1762.     av_free(sum);

  1763. }

  1764. 

  1765. void sws_subVec(SwsVector *a, SwsVector *b)

  1766. {

  1767.     SwsVector *diff = sws_diffVec(a, b);

  1768.     av_free(a->coeff);

  1769.     a->coeff  = diff->coeff;

  1770.     a->length = diff->length;

  1771.     av_free(diff);

  1772. }

  1773. 

  1774. void sws_convVec(SwsVector *a, SwsVector *b)

  1775. {

  1776.     SwsVector *conv = sws_getConvVec(a, b);

  1777.     av_free(a->coeff);

  1778.     a->coeff  = conv->coeff;

  1779.     a->length = conv->length;

  1780.     av_free(conv);

  1781. }

  1782. 

  1783. SwsVector *sws_cloneVec(SwsVector *a)

  1784. {

  1785.     SwsVector *vec = sws_allocVec(a->length);

  1786. 

  1787.     if (!vec)

  1788.         return NULL;

  1789. 

  1790.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  1791. 

  1792.     return vec;

  1793. }

  1794. 

  1795. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1796. {

  1797.     int i;

  1798.     double max = 0;

  1799.     double min = 0;

  1800.     double range;

  1801. 

  1802.     for (i = 0; i < a->length; i++)

  1803.         if (a->coeff[i] > max)

  1804.             max = a->coeff[i];

  1805. 

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

  1807.         if (a->coeff[i] < min)

  1808.             min = a->coeff[i];

  1809. 

  1810.     range = max - min;

  1811. 

  1812.     for (i = 0; i < a->length; i++) {

  1813.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1814.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1815.         for (; x > 0; x--)

  1816.             av_log(log_ctx, log_level, " ");

  1817.         av_log(log_ctx, log_level, "|\n");

  1818.     }

  1819. }

  1820. 

  1821. void sws_freeVec(SwsVector *a)

  1822. {

  1823.     if (!a)

  1824.         return;

  1825.     av_freep(&a->coeff);

  1826.     a->length = 0;

  1827.     av_free(a);

  1828. }

  1829. 

  1830. void sws_freeFilter(SwsFilter *filter)

  1831. {

  1832.     if (!filter)

  1833.         return;

  1834. 

  1835.     sws_freeVec(filter->lumH);

  1836.     sws_freeVec(filter->lumV);

  1837.     sws_freeVec(filter->chrH);

  1838.     sws_freeVec(filter->chrV);

  1839.     av_free(filter);

  1840. }

  1841. 

  1842. void sws_freeContext(SwsContext *c)

  1843. {

  1844.     int i;

  1845.     if (!c)

  1846.         return;

  1847. 

  1848.     if (c->lumPixBuf) {

  1849.         for (i = 0; i < c->vLumBufSize; i++)

  1850.             av_freep(&c->lumPixBuf[i]);

  1851.         av_freep(&c->lumPixBuf);

  1852.     }

  1853. 

  1854.     if (c->chrUPixBuf) {

  1855.         for (i = 0; i < c->vChrBufSize; i++)

  1856.             av_freep(&c->chrUPixBuf[i]);

  1857.         av_freep(&c->chrUPixBuf);

  1858.         av_freep(&c->chrVPixBuf);

  1859.     }

  1860. 

  1861.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1862.         for (i = 0; i < c->vLumBufSize; i++)

  1863.             av_freep(&c->alpPixBuf[i]);

  1864.         av_freep(&c->alpPixBuf);

  1865.     }

  1866. 

  1867.     for (i = 0; i < 4; i++)

  1868.         av_freep(&c->dither_error[i]);

  1869. 

  1870.     av_freep(&c->vLumFilter);

  1871.     av_freep(&c->vChrFilter);

  1872.     av_freep(&c->hLumFilter);

  1873.     av_freep(&c->hChrFilter);

  1874. #if HAVE_ALTIVEC

  1875.     av_freep(&c->vYCoeffsBank);

  1876.     av_freep(&c->vCCoeffsBank);

  1877. #endif

  1878. 

  1879.     av_freep(&c->vLumFilterPos);

  1880.     av_freep(&c->vChrFilterPos);

  1881.     av_freep(&c->hLumFilterPos);

  1882.     av_freep(&c->hChrFilterPos);

  1883. 

  1884. #if HAVE_MMX_INLINE

  1885. #if USE_MMAP

  1886.     if (c->lumMmxextFilterCode)

  1887.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1888.     if (c->chrMmxextFilterCode)

  1889.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1890. #elif HAVE_VIRTUALALLOC

  1891.     if (c->lumMmxextFilterCode)

  1892.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1893.     if (c->chrMmxextFilterCode)

  1894.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1895. #else

  1896.     av_free(c->lumMmxextFilterCode);

  1897.     av_free(c->chrMmxextFilterCode);

  1898. #endif

  1899.     c->lumMmxextFilterCode = NULL;

  1900.     c->chrMmxextFilterCode = NULL;

  1901. #endif /* HAVE_MMX_INLINE */

  1902. 

  1903.     av_freep(&c->yuvTable);

  1904.     av_freep(&c->formatConvBuffer);

  1905. 

  1906.     av_free(c);

  1907. }

  1908. 

  1909. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1910.                                         int srcH, enum AVPixelFormat srcFormat,

  1911.                                         int dstW, int dstH,

  1912.                                         enum AVPixelFormat dstFormat, int flags,

  1913.                                         SwsFilter *srcFilter,

  1914.                                         SwsFilter *dstFilter,

  1915.                                         const double *param)

  1916. {

  1917.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1918.                                              SWS_PARAM_DEFAULT };

  1919. 

  1920.     if (!param)

  1921.         param = default_param;

  1922. 

  1923.     if (context &&

  1924.         (context->srcW      != srcW      ||

  1925.          context->srcH      != srcH      ||

  1926.          context->srcFormat != srcFormat ||

  1927.          context->dstW      != dstW      ||

  1928.          context->dstH      != dstH      ||

  1929.          context->dstFormat != dstFormat ||

  1930.          context->flags     != flags     ||

  1931.          context->param[0]  != param[0]  ||

  1932.          context->param[1]  != param[1])) {

  1933.         sws_freeContext(context);

  1934.         context = NULL;

  1935.     }

  1936. 

  1937.     if (!context) {

  1938.         if (!(context = sws_alloc_context()))

  1939.             return NULL;

  1940.         context->srcW      = srcW;

  1941.         context->srcH      = srcH;

  1942.         context->srcFormat = srcFormat;

  1943.         context->dstW      = dstW;

  1944.         context->dstH      = dstH;

  1945.         context->dstFormat = dstFormat;

  1946.         context->flags     = flags;

  1947.         context->param[0]  = param[0];

  1948.         context->param[1]  = param[1];

  1949.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1950.             sws_freeContext(context);

  1951.             return NULL;

  1952.         }

  1953.     }

  1954.     return context;

  1955. }