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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. typedef struct FormatEntry {

  76.     uint8_t is_supported_in         :1;

  77.     uint8_t is_supported_out        :1;

  78.     uint8_t is_supported_endianness :1;

  79. } FormatEntry;

  80. 

  81. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  221. };

  222. 

  223. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  224. {

  225.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  226.            format_entries[pix_fmt].is_supported_in : 0;

  227. }

  228. 

  229. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  230. {

  231.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  232.            format_entries[pix_fmt].is_supported_out : 0;

  233. }

  234. 

  235. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  236. {

  237.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  238.            format_entries[pix_fmt].is_supported_endianness : 0;

  239. }

  240. 

  241. #if FF_API_SWS_FORMAT_NAME

  242. const char *sws_format_name(enum AVPixelFormat format)

  243. {

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

  245.     if (desc)

  246.         return desc->name;

  247.     else

  248.         return "Unknown format";

  249. }

  250. #endif

  251. 

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

  253.                              double dist)

  254. {

  255.     if (dist <= 1.0)

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

  257.     else

  258.         return getSplineCoeff(0.0,

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

  260.                                c + 3.0 * d,

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

  262.                               dist - 1.0);

  263. }

  264. 

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

  266. {

  267.     if (pos < 0) {

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

  269.     }

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

  271.     return pos >> chr_subsample;

  272. }

  273. 

  274. typedef struct {

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

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

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

  278. } ScaleAlgorithm;

  279. 

  280. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  292. };

  293. 

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

  295.                               int *outFilterSize, int xInc, int srcW,

  296.                               int dstW, int filterAlign, int one,

  297.                               int flags, int cpu_flags,

  298.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  300. {

  301.     int i;

  302.     int filterSize;

  303.     int filter2Size;

  304.     int minFilterSize;

  305.     int64_t *filter    = NULL;

  306.     int64_t *filter2   = NULL;

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

  308.     int ret            = -1;

  309. 

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

  311. 

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

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

  314. 

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

  316.         int i;

  317.         filterSize = 1;

  318.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  320. 

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

  322.             filter[i * filterSize] = fone;

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

  324.         }

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

  326.         int i;

  327.         int64_t xDstInSrc;

  328.         filterSize = 1;

  329.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  331. 

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

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

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

  335. 

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

  337.             filter[i]       = fone;

  338.             xDstInSrc      += xInc;

  339.         }

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

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

  342.         int i;

  343.         int64_t xDstInSrc;

  344.         filterSize = 2;

  345.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  347. 

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

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

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

  351.             int j;

  352. 

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

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

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

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

  357.                 if (coeff < 0)

  358.                     coeff = 0;

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

  360.                 xx++;

  361.             }

  362.             xDstInSrc += xInc;

  363.         }

  364.     } else {

  365.         int64_t xDstInSrc;

  366.         int sizeFactor = -1;

  367. 

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

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

  370.                 sizeFactor = scale_algorithms[i].size_factor;

  371.                 break;

  372.             }

  373.         }

  374.         if (flags & SWS_LANCZOS)

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

  376.         av_assert0(sizeFactor > 0);

  377. 

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

  379.             filterSize = 1 + sizeFactor;    // upscale

  380.         else

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

  382. 

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

  384.         filterSize = FFMAX(filterSize, 1);

  385. 

  386.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  388. 

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

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

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

  392.             int j;

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

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

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

  396.                 double floatd;

  397.                 int64_t coeff;

  398. 

  399.                 if (xInc > 1 << 16)

  400.                     d = d * dstW / srcW;

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

  402. 

  403.                 if (flags & SWS_BICUBIC) {

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

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

  406. 

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

  408.                         coeff = 0.0;

  409.                     } else {

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

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

  412. 

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

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

  415.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  416.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  417.                         else

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

  419.                                       (6 * B + 30 * C) * dd  +

  420.                                     (-12 * B - 48 * C) * d   +

  421.                                       (8 * B + 24 * C) * (1 << 30);

  422.                     }

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

  424.                 }

  425. #if 0

  426.                 else if (flags & SWS_X) {

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

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

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

  430.                 }

  431. #endif

  432.                 else if (flags & SWS_X) {

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

  434.                     double c;

  435. 

  436.                     if (floatd < 1.0)

  437.                         c = cos(floatd * M_PI);

  438.                     else

  439.                         c = -1.0;

  440.                     if (c < 0.0)

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

  442.                     else

  443.                         c = pow(c, A);

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

  445.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  451.                     else

  452.                         coeff = 0.0;

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

  454.                 } else if (flags & SWS_GAUSS) {

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

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

  457.                 } else if (flags & SWS_SINC) {

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

  459.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  463.                     if (floatd > p)

  464.                         coeff = 0;

  465.                 } else if (flags & SWS_BILINEAR) {

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

  467.                     if (coeff < 0)

  468.                         coeff = 0;

  469.                     coeff *= fone >> 30;

  470.                 } else if (flags & SWS_SPLINE) {

  471.                     double p = -2.196152422706632;

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

  473.                 } else {

  474.                     av_assert0(0);

  475.                 }

  476. 

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

  478.                 xx++;

  479.             }

  480.             xDstInSrc += 2 * xInc;

  481.         }

  482.     }

  483. 

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

  485.      * av_free(filter);

  486.      */

  487.     av_assert0(filterSize > 0);

  488.     filter2Size = filterSize;

  489.     if (srcFilter)

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

  491.     if (dstFilter)

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

  493.     av_assert0(filter2Size > 0);

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

  495. 

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

  497.         int j, k;

  498. 

  499.         if (srcFilter) {

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

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

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

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

  504.             }

  505.         } else {

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

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

  508.         }

  509.         // FIXME dstFilter

  510. 

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

  512.     }

  513.     av_freep(&filter);

  514. 

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

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

  517.     minFilterSize = 0;

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

  519.         int min = filter2Size;

  520.         int j;

  521.         int64_t cutOff = 0.0;

  522. 

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

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

  525.             int k;

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

  527. 

  528.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  529.                 break;

  530. 

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

  532.              * filter otherwise */

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

  534.                 break;

  535. 

  536.             // move filter coefficients left

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

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

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

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

  541.         }

  542. 

  543.         cutOff = 0;

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

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

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

  547. 

  548.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  549.                 break;

  550.             min--;

  551.         }

  552. 

  553.         if (min > minFilterSize)

  554.             minFilterSize = min;

  555.     }

  556. 

  557.     if (PPC_ALTIVEC(cpu_flags)) {

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

  559.         if (minFilterSize < 5)

  560.             filterAlign = 4;

  561. 

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

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

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

  565.         if (minFilterSize < 3)

  566.             filterAlign = 1;

  567.     }

  568. 

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

  570.         // special case for unscaled vertical filtering

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

  572.             filterAlign = 1;

  573.     }

  574. 

  575.     av_assert0(minFilterSize > 0);

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

  577.     av_assert0(filterSize > 0);

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

  579.     if (!filter)

  580.         goto fail;

  581.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  583.         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",

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

  585.         goto fail;

  586.     }

  587.     *outFilterSize = filterSize;

  588. 

  589.     if (flags & SWS_PRINT_INFO)

  590.         av_log(NULL, AV_LOG_VERBOSE,

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

  592.                filter2Size, filterSize);

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

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

  595.         int j;

  596. 

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

  598.             if (j >= filter2Size)

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

  600.             else

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

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

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

  604.         }

  605.     }

  606. 

  607.     // FIXME try to align filterPos if possible

  608. 

  609.     // fix borders

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

  611.         int j;

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

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

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

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

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

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

  618.             }

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

  620.         }

  621. 

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

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

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

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

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

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

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

  629.             }

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

  631.         }

  632.     }

  633. 

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

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

  636.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  638. 

  639.     /* normalize & store in outFilter */

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

  641.         int j;

  642.         int64_t error = 0;

  643.         int64_t sum   = 0;

  644. 

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

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

  647.         }

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

  649.         if (!sum) {

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

  651.             sum = 1;

  652.         }

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

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

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

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

  657.             error                                  = v - intV * sum;

  658.         }

  659.     }

  660. 

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

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

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

  664.                                                       * read over the end */

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

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

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

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

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

  670.     }

  671. 

  672.     ret = 0;

  673. 

  674. fail:

  675.     if(ret < 0)

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

  677.     av_free(filter);

  678.     av_free(filter2);

  679.     return ret;

  680. }

  681. 

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

  683. {

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

  685.     int64_t vr =  table[0];

  686.     int64_t ub =  table[1];

  687.     int64_t ug = -table[2];

  688.     int64_t vg = -table[3];

  689.     int64_t ONE = 65536;

  690.     int64_t cy = ONE;

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

  692.     int i;

  693.     static const int8_t map[] = {

  694.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  695.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  696.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  697.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  698.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  699.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  700.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  701.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  702.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  703.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  704.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  705.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  706.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  707.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

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

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

  710.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  711.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

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

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

  714.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  715.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

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

  717.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  718.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  719.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  720.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  721.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  722.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  723.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  724.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  725.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  729.     };

  730. 

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

  732. 

  733.     if (!dstRange) {

  734.         cy = cy * 255 / 219;

  735.     } else {

  736.         vr = vr * 224 / 255;

  737.         ub = ub * 224 / 255;

  738.         ug = ug * 224 / 255;

  739.         vg = vg * 224 / 255;

  740.     }

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

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

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

  744. 

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

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

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

  748. 

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

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

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

  752. 

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

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

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

  756. 

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

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

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

  760. 

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

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

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

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

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

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

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

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

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

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

  771.     }

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

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

  774. }

  775. 

  776. static void fill_xyztables(struct SwsContext *c)

  777. {

  778.     int i;

  779.     double xyzgamma = XYZ_GAMMA;

  780.     double rgbgamma = 1.0 / RGB_GAMMA;

  781.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  782.     double rgbgammainv = RGB_GAMMA;

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

  784.         {13270, -6295, -2041},

  785.         {-3969,  7682,   170},

  786.         {  228,  -835,  4329} };

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

  788.         {1689, 1464,  739},

  789.         { 871, 2929,  296},

  790.         {  79,  488, 3891} };

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

  792. 

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

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

  795.     c->xyzgamma = xyzgamma_tab;

  796.     c->rgbgamma = rgbgamma_tab;

  797.     c->xyzgammainv = xyzgammainv_tab;

  798.     c->rgbgammainv = rgbgammainv_tab;

  799. 

  800.     if (rgbgamma_tab[4095])

  801.         return;

  802. 

  803.     /* set gamma vectors */

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

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

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

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

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

  809.     }

  810. }

  811. 

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

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

  814.                              int brightness, int contrast, int saturation)

  815. {

  816.     const AVPixFmtDescriptor *desc_dst;

  817.     const AVPixFmtDescriptor *desc_src;

  818.     int need_reinit = 0;

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

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

  821. 

  822.     handle_formats(c);

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

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

  825. 

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

  827.         dstRange = 0;

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

  829.         srcRange = 0;

  830. 

  831.     c->brightness = brightness;

  832.     c->contrast   = contrast;

  833.     c->saturation = saturation;

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

  835.         need_reinit = 1;

  836.     c->srcRange   = srcRange;

  837.     c->dstRange   = dstRange;

  838. 

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

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

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

  842.         ff_sws_init_range_convert(c);

  843. 

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

  845.         return -1;

  846. 

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

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

  849. 

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

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

  852.                                  contrast, saturation);

  853.         // FIXME factorize

  854. 

  855.         if (ARCH_PPC)

  856.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  857.                                        contrast, saturation);

  858.     }

  859. 

  860.     fill_rgb2yuv_table(c, table, dstRange);

  861. 

  862.     return 0;

  863. }

  864. 

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

  866.                              int *srcRange, int **table, int *dstRange,

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

  868. {

  869.     if (!c )

  870.         return -1;

  871. 

  872.     *inv_table  = c->srcColorspaceTable;

  873.     *table      = c->dstColorspaceTable;

  874.     *srcRange   = c->srcRange;

  875.     *dstRange   = c->dstRange;

  876.     *brightness = c->brightness;

  877.     *contrast   = c->contrast;

  878.     *saturation = c->saturation;

  879. 

  880.     return 0;

  881. }

  882. 

  883. static int handle_jpeg(enum AVPixelFormat *format)

  884. {

  885.     switch (*format) {

  886.     case AV_PIX_FMT_YUVJ420P:

  887.         *format = AV_PIX_FMT_YUV420P;

  888.         return 1;

  889.     case AV_PIX_FMT_YUVJ411P:

  890.         *format = AV_PIX_FMT_YUV411P;

  891.         return 1;

  892.     case AV_PIX_FMT_YUVJ422P:

  893.         *format = AV_PIX_FMT_YUV422P;

  894.         return 1;

  895.     case AV_PIX_FMT_YUVJ444P:

  896.         *format = AV_PIX_FMT_YUV444P;

  897.         return 1;

  898.     case AV_PIX_FMT_YUVJ440P:

  899.         *format = AV_PIX_FMT_YUV440P;

  900.         return 1;

  901.     case AV_PIX_FMT_GRAY8:

  902.     case AV_PIX_FMT_GRAY16LE:

  903.     case AV_PIX_FMT_GRAY16BE:

  904.         return 1;

  905.     default:

  906.         return 0;

  907.     }

  908. }

  909. 

  910. static int handle_0alpha(enum AVPixelFormat *format)

  911. {

  912.     switch (*format) {

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

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

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

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

  917.     default:                                          return 0;

  918.     }

  919. }

  920. 

  921. static int handle_xyz(enum AVPixelFormat *format)

  922. {

  923.     switch (*format) {

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

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

  926.     default:                                                return 0;

  927.     }

  928. }

  929. 

  930. static void handle_formats(SwsContext *c)

  931. {

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

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

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

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

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

  937.         fill_xyztables(c);

  938. }

  939. 

  940. SwsContext *sws_alloc_context(void)

  941. {

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

  943. 

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

  945. 

  946.     if (c) {

  947.         c->av_class = &sws_context_class;

  948.         av_opt_set_defaults(c);

  949.     }

  950. 

  951.     return c;

  952. }

  953. 

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

  955.                              SwsFilter *dstFilter)

  956. {

  957.     int i, j;

  958.     int usesVFilter, usesHFilter;

  959.     int unscaled;

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

  961.     int srcW              = c->srcW;

  962.     int srcH              = c->srcH;

  963.     int dstW              = c->dstW;

  964.     int dstH              = c->dstH;

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

  966.     int flags, cpu_flags;

  967.     enum AVPixelFormat srcFormat = c->srcFormat;

  968.     enum AVPixelFormat dstFormat = c->dstFormat;

  969.     const AVPixFmtDescriptor *desc_src;

  970.     const AVPixFmtDescriptor *desc_dst;

  971. 

  972.     cpu_flags = av_get_cpu_flags();

  973.     flags     = c->flags;

  974.     emms_c();

  975.     if (!rgb15to16)

  976.         sws_rgb2rgb_init();

  977. 

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

  979. 

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

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

  982. 

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

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

  985. 

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

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

  988.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

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

  990. 

  991.     handle_formats(c);

  992.     srcFormat = c->srcFormat;

  993.     dstFormat = c->dstFormat;

  994.     desc_src = av_pix_fmt_desc_get(srcFormat);

  995.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  996. 

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

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

  999.     if (!sws_isSupportedInput(srcFormat)) {

  1000.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1001.                av_get_pix_fmt_name(srcFormat));

  1002.         return AVERROR(EINVAL);

  1003.     }

  1004.     if (!sws_isSupportedOutput(dstFormat)) {

  1005.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1006.                av_get_pix_fmt_name(dstFormat));

  1007.         return AVERROR(EINVAL);

  1008.     }

  1009.     }

  1010. 

  1011.     i = flags & (SWS_POINT         |

  1012.                  SWS_AREA          |

  1013.                  SWS_BILINEAR      |

  1014.                  SWS_FAST_BILINEAR |

  1015.                  SWS_BICUBIC       |

  1016.                  SWS_X             |

  1017.                  SWS_GAUSS         |

  1018.                  SWS_LANCZOS       |

  1019.                  SWS_SINC          |

  1020.                  SWS_SPLINE        |

  1021.                  SWS_BICUBLIN);

  1022. 

  1023.     /* provide a default scaler if not set by caller */

  1024.     if (!i) {

  1025.         if (dstW < srcW && dstH < srcH)

  1026.             flags |= SWS_BICUBIC;

  1027.         else if (dstW > srcW && dstH > srcH)

  1028.             flags |= SWS_BICUBIC;

  1029.         else

  1030.             flags |= SWS_BICUBIC;

  1031.         c->flags = flags;

  1032.     } else if (i & (i - 1)) {

  1033.         av_log(c, AV_LOG_ERROR,

  1034.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1035.         return AVERROR(EINVAL);

  1036.     }

  1037.     /* sanity check */

  1038.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1039.         /* FIXME check if these are enough and try to lower them after

  1040.          * fixing the relevant parts of the code */

  1041.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1042.                srcW, srcH, dstW, dstH);

  1043.         return AVERROR(EINVAL);

  1044.     }

  1045. 

  1046.     if (!dstFilter)

  1047.         dstFilter = &dummyFilter;

  1048.     if (!srcFilter)

  1049.         srcFilter = &dummyFilter;

  1050. 

  1051.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1052.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1053.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1054.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1055.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1056. 

  1057.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1058.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1059.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1060.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1061.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1062.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1063.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1064.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1065. 

  1066.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1067.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1068. 

  1069.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1070.         if (dstW&1) {

  1071.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1072.             flags |= SWS_FULL_CHR_H_INT;

  1073.             c->flags = flags;

  1074.         }

  1075. 

  1076.         if (   c->chrSrcHSubSample == 0

  1077.             && c->chrSrcVSubSample == 0

  1078.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1079.             && !(c->flags & SWS_FAST_BILINEAR)

  1080.         ) {

  1081.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1082.             flags |= SWS_FULL_CHR_H_INT;

  1083.             c->flags = flags;

  1084.         }

  1085.     }

  1086. 

  1087.     if (c->dither == SWS_DITHER_AUTO) {

  1088.         if (flags & SWS_ERROR_DIFFUSION)

  1089.             c->dither = SWS_DITHER_ED;

  1090.     }

  1091. 

  1092.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1093.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1094.        dstFormat == AV_PIX_FMT_BGR8 ||

  1095.        dstFormat == AV_PIX_FMT_RGB8) {

  1096.         if (c->dither == SWS_DITHER_AUTO)

  1097.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

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

  1099.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1100.                 av_log(c, AV_LOG_DEBUG,

  1101.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1102.                     av_get_pix_fmt_name(dstFormat));

  1103.                 flags   |= SWS_FULL_CHR_H_INT;

  1104.                 c->flags = flags;

  1105.             }

  1106.         }

  1107.         if (flags & SWS_FULL_CHR_H_INT) {

  1108.             if (c->dither == SWS_DITHER_BAYER) {

  1109.                 av_log(c, AV_LOG_DEBUG,

  1110.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1111.                     av_get_pix_fmt_name(dstFormat));

  1112.                 c->dither = SWS_DITHER_ED;

  1113.             }

  1114.         }

  1115.     }

  1116.     if (isPlanarRGB(dstFormat)) {

  1117.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1118.             av_log(c, AV_LOG_DEBUG,

  1119.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1120.                    av_get_pix_fmt_name(dstFormat));

  1121.             flags   |= SWS_FULL_CHR_H_INT;

  1122.             c->flags = flags;

  1123.         }

  1124.     }

  1125. 

  1126.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1127.      * chroma interpolation */

  1128.     if (flags & SWS_FULL_CHR_H_INT &&

  1129.         isAnyRGB(dstFormat)        &&

  1130.         !isPlanarRGB(dstFormat)    &&

  1131.         dstFormat != AV_PIX_FMT_RGBA  &&

  1132.         dstFormat != AV_PIX_FMT_ARGB  &&

  1133.         dstFormat != AV_PIX_FMT_BGRA  &&

  1134.         dstFormat != AV_PIX_FMT_ABGR  &&

  1135.         dstFormat != AV_PIX_FMT_RGB24 &&

  1136.         dstFormat != AV_PIX_FMT_BGR24 &&

  1137.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1138.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1139.         dstFormat != AV_PIX_FMT_BGR8 &&

  1140.         dstFormat != AV_PIX_FMT_RGB8

  1141.     ) {

  1142.         av_log(c, AV_LOG_WARNING,

  1143.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1144.                av_get_pix_fmt_name(dstFormat));

  1145.         flags   &= ~SWS_FULL_CHR_H_INT;

  1146.         c->flags = flags;

  1147.     }

  1148.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1149.         c->chrDstHSubSample = 1;

  1150. 

  1151.     // drop some chroma lines if the user wants it

  1152.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1153.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1154.     c->chrSrcVSubSample += c->vChrDrop;

  1155. 

  1156.     /* drop every other pixel for chroma calculation unless user

  1157.      * wants full chroma */

  1158.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1159.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1160.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1161.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1162.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1163.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1164.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1165.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1166.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1167.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1168.          (flags & SWS_FAST_BILINEAR)))

  1169.         c->chrSrcHSubSample = 1;

  1170. 

  1171.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1172.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1173.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1174.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1175.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1176. 

  1177.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1178. 

  1179.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1180.     if (c->srcBpc < 8)

  1181.         c->srcBpc = 8;

  1182.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1183.     if (c->dstBpc < 8)

  1184.         c->dstBpc = 8;

  1185.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1186.         c->srcBpc = 16;

  1187.     if (c->dstBpc == 16)

  1188.         dst_stride <<= 1;

  1189. 

  1190.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1191.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1192.                              c->chrDstW >= c->chrSrcW &&

  1193.                              (srcW & 15) == 0;

  1194.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1195. 

  1196.             && (flags & SWS_FAST_BILINEAR)) {

  1197.             if (flags & SWS_PRINT_INFO)

  1198.                 av_log(c, AV_LOG_INFO,

  1199.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1200.         }

  1201.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1202.             c->canMMXEXTBeUsed = 0;

  1203.     } else

  1204.         c->canMMXEXTBeUsed = 0;

  1205. 

  1206.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1207.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1208. 

  1209.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1210.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1211.      * correct scaling.

  1212.      * n-2 is the last chrominance sample available.

  1213.      * This is not perfect, but no one should notice the difference, the more

  1214.      * correct variant would be like the vertical one, but that would require

  1215.      * some special code for the first and last pixel */

  1216.     if (flags & SWS_FAST_BILINEAR) {

  1217.         if (c->canMMXEXTBeUsed) {

  1218.             c->lumXInc += 20;

  1219.             c->chrXInc += 20;

  1220.         }

  1221.         // we don't use the x86 asm scaler if MMX is available

  1222.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1223.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1224.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1225.         }

  1226.     }

  1227. 

  1228. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1229. 

  1230.     /* precalculate horizontal scaler filter coefficients */

  1231.     {

  1232. #if HAVE_MMXEXT_INLINE

  1233. // can't downscale !!!

  1234.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1235.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1236.                                                              NULL, NULL, 8);

  1237.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1238.                                                              NULL, NULL, NULL, 4);

  1239. 

  1240. #if USE_MMAP

  1241.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1242.                                           PROT_READ | PROT_WRITE,

  1243.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1244.                                           -1, 0);

  1245.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1246.                                           PROT_READ | PROT_WRITE,

  1247.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1248.                                           -1, 0);

  1249. #elif HAVE_VIRTUALALLOC

  1250.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1251.                                                   c->lumMmxextFilterCodeSize,

  1252.                                                   MEM_COMMIT,

  1253.                                                   PAGE_EXECUTE_READWRITE);

  1254.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1255.                                                   c->chrMmxextFilterCodeSize,

  1256.                                                   MEM_COMMIT,

  1257.                                                   PAGE_EXECUTE_READWRITE);

  1258. #else

  1259.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1260.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1261. #endif

  1262. 

  1263. #ifdef MAP_ANONYMOUS

  1264.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1265. #else

  1266.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1267. #endif

  1268.             {

  1269.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1270.                 return AVERROR(ENOMEM);

  1271.             }

  1272. 

  1273.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1274.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1275.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1276.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1277. 

  1278.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1279.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1280.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1281.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1282. 

  1283. #if USE_MMAP

  1284.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1285.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1286.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1287.                 goto fail;

  1288.             }

  1289. #endif

  1290.         } else

  1291. #endif /* HAVE_MMXEXT_INLINE */

  1292.         {

  1293.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1294.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1295. 

  1296.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1297.                            &c->hLumFilterSize, c->lumXInc,

  1298.                            srcW, dstW, filterAlign, 1 << 14,

  1299.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1300.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1301.                            c->param,

  1302.                            get_local_pos(c, 0, 0, 0),

  1303.                            get_local_pos(c, 0, 0, 0)) < 0)

  1304.                 goto fail;

  1305.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1306.                            &c->hChrFilterSize, c->chrXInc,

  1307.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1308.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1309.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1310.                            c->param,

  1311.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1312.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)

  1313.                 goto fail;

  1314.         }

  1315.     } // initialize horizontal stuff

  1316. 

  1317.     /* precalculate vertical scaler filter coefficients */

  1318.     {

  1319.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1320.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1321. 

  1322.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1323.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1324.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1325.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1326.                        c->param,

  1327.                        get_local_pos(c, 0, 0, 1),

  1328.                        get_local_pos(c, 0, 0, 1)) < 0)

  1329.             goto fail;

  1330.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1331.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1332.                        filterAlign, (1 << 12),

  1333.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1334.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1335.                        c->param,

  1336.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1337.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)

  1338. 

  1339.             goto fail;

  1340. 

  1341. #if HAVE_ALTIVEC

  1342.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1343.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1344. 

  1345.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1346.             int j;

  1347.             short *p = (short *)&c->vYCoeffsBank[i];

  1348.             for (j = 0; j < 8; j++)

  1349.                 p[j] = c->vLumFilter[i];

  1350.         }

  1351. 

  1352.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1353.             int j;

  1354.             short *p = (short *)&c->vCCoeffsBank[i];

  1355.             for (j = 0; j < 8; j++)

  1356.                 p[j] = c->vChrFilter[i];

  1357.         }

  1358. #endif

  1359.     }

  1360. 

  1361.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1362.     c->vLumBufSize = c->vLumFilterSize;

  1363.     c->vChrBufSize = c->vChrFilterSize;

  1364.     for (i = 0; i < dstH; i++) {

  1365.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1366.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1367.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1368.                                << c->chrSrcVSubSample));

  1369. 

  1370.         nextSlice >>= c->chrSrcVSubSample;

  1371.         nextSlice <<= c->chrSrcVSubSample;

  1372.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1373.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1374.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1375.             (nextSlice >> c->chrSrcVSubSample))

  1376.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1377.                              c->vChrFilterPos[chrI];

  1378.     }

  1379. 

  1380.     for (i = 0; i < 4; i++)

  1381.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1382. 

  1383.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1384.      * need to allocate several megabytes to handle all possible cases) */

  1385.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1386.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1387.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1388.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1389.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1390.     /* Note we need at least one pixel more at the end because of the MMX code

  1391.      * (just in case someone wants to replace the 4000/8000). */

  1392.     /* align at 16 bytes for AltiVec */

  1393.     for (i = 0; i < c->vLumBufSize; i++) {

  1394.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1395.                           dst_stride + 16, fail);

  1396.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1397.     }

  1398.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1399.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1400.     c->uv_offx2 = dst_stride + 16;

  1401.     for (i = 0; i < c->vChrBufSize; i++) {

  1402.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1403.                          dst_stride * 2 + 32, fail);

  1404.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1405.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1406.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1407.     }

  1408.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1409.         for (i = 0; i < c->vLumBufSize; i++) {

  1410.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1411.                               dst_stride + 16, fail);

  1412.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1413.         }

  1414. 

  1415.     // try to avoid drawing green stuff between the right end and the stride end

  1416.     for (i = 0; i < c->vChrBufSize; i++)

  1417.         if(desc_dst->comp[0].depth_minus1 == 15){

  1418.             av_assert0(c->dstBpc > 14);

  1419.             for(j=0; j<dst_stride/2+1; j++)

  1420.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1421.         } else

  1422.             for(j=0; j<dst_stride+1; j++)

  1423.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1424. 

  1425.     av_assert0(c->chrDstH <= dstH);

  1426. 

  1427.     if (flags & SWS_PRINT_INFO) {

  1428.         const char *scaler = NULL, *cpucaps;

  1429. 

  1430.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1431.             if (flags & scale_algorithms[i].flag) {

  1432.                 scaler = scale_algorithms[i].description;

  1433.                 break;

  1434.             }

  1435.         }

  1436.         if (!scaler)

  1437.             scaler =  "ehh flags invalid?!";

  1438.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1439.                scaler,

  1440.                av_get_pix_fmt_name(srcFormat),

  1441. #ifdef DITHER1XBPP

  1442.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1443.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1444.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1445.                                                              "dithered " : "",

  1446. #else

  1447.                "",

  1448. #endif

  1449.                av_get_pix_fmt_name(dstFormat));

  1450. 

  1451.         if (INLINE_MMXEXT(cpu_flags))

  1452.             cpucaps = "MMXEXT";

  1453.         else if (INLINE_AMD3DNOW(cpu_flags))

  1454.             cpucaps = "3DNOW";

  1455.         else if (INLINE_MMX(cpu_flags))

  1456.             cpucaps = "MMX";

  1457.         else if (PPC_ALTIVEC(cpu_flags))

  1458.             cpucaps = "AltiVec";

  1459.         else

  1460.             cpucaps = "C";

  1461. 

  1462.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1463. 

  1464.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1465.         av_log(c, AV_LOG_DEBUG,

  1466.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1467.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1468.         av_log(c, AV_LOG_DEBUG,

  1469.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1470.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1471.                c->chrXInc, c->chrYInc);

  1472.     }

  1473. 

  1474.     /* unscaled special cases */

  1475.     if (unscaled && !usesHFilter && !usesVFilter &&

  1476.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1477.         ff_get_unscaled_swscale(c);

  1478. 

  1479.         if (c->swscale) {

  1480.             if (flags & SWS_PRINT_INFO)

  1481.                 av_log(c, AV_LOG_INFO,

  1482.                        "using unscaled %s -> %s special converter\n",

  1483.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1484.             return 0;

  1485.         }

  1486.     }

  1487. 

  1488.     c->swscale = ff_getSwsFunc(c);

  1489.     return 0;

  1490. fail: // FIXME replace things by appropriate error codes

  1491.     return -1;

  1492. }

  1493. 

  1494. #if FF_API_SWS_GETCONTEXT

  1495. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1496.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1497.                            int flags, SwsFilter *srcFilter,

  1498.                            SwsFilter *dstFilter, const double *param)

  1499. {

  1500.     SwsContext *c;

  1501. 

  1502.     if (!(c = sws_alloc_context()))

  1503.         return NULL;

  1504. 

  1505.     c->flags     = flags;

  1506.     c->srcW      = srcW;

  1507.     c->srcH      = srcH;

  1508.     c->dstW      = dstW;

  1509.     c->dstH      = dstH;

  1510.     c->srcFormat = srcFormat;

  1511.     c->dstFormat = dstFormat;

  1512. 

  1513.     if (param) {

  1514.         c->param[0] = param[0];

  1515.         c->param[1] = param[1];

  1516.     }

  1517. 

  1518.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1519.         sws_freeContext(c);

  1520.         return NULL;

  1521.     }

  1522. 

  1523.     return c;

  1524. }

  1525. #endif

  1526. 

  1527. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1528.                                 float lumaSharpen, float chromaSharpen,

  1529.                                 float chromaHShift, float chromaVShift,

  1530.                                 int verbose)

  1531. {

  1532.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1533.     if (!filter)

  1534.         return NULL;

  1535. 

  1536.     if (lumaGBlur != 0.0) {

  1537.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1538.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1539.     } else {

  1540.         filter->lumH = sws_getIdentityVec();

  1541.         filter->lumV = sws_getIdentityVec();

  1542.     }

  1543. 

  1544.     if (chromaGBlur != 0.0) {

  1545.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1546.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1547.     } else {

  1548.         filter->chrH = sws_getIdentityVec();

  1549.         filter->chrV = sws_getIdentityVec();

  1550.     }

  1551. 

  1552.     if (chromaSharpen != 0.0) {

  1553.         SwsVector *id = sws_getIdentityVec();

  1554.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1555.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1556.         sws_addVec(filter->chrH, id);

  1557.         sws_addVec(filter->chrV, id);

  1558.         sws_freeVec(id);

  1559.     }

  1560. 

  1561.     if (lumaSharpen != 0.0) {

  1562.         SwsVector *id = sws_getIdentityVec();

  1563.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1564.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1565.         sws_addVec(filter->lumH, id);

  1566.         sws_addVec(filter->lumV, id);

  1567.         sws_freeVec(id);

  1568.     }

  1569. 

  1570.     if (chromaHShift != 0.0)

  1571.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1572. 

  1573.     if (chromaVShift != 0.0)

  1574.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1575. 

  1576.     sws_normalizeVec(filter->chrH, 1.0);

  1577.     sws_normalizeVec(filter->chrV, 1.0);

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

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

  1580. 

  1581.     if (verbose)

  1582.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1583.     if (verbose)

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

  1585. 

  1586.     return filter;

  1587. }

  1588. 

  1589. SwsVector *sws_allocVec(int length)

  1590. {

  1591.     SwsVector *vec;

  1592. 

  1593.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1594.         return NULL;

  1595. 

  1596.     vec = av_malloc(sizeof(SwsVector));

  1597.     if (!vec)

  1598.         return NULL;

  1599.     vec->length = length;

  1600.     vec->coeff  = av_malloc(sizeof(double) * length);

  1601.     if (!vec->coeff)

  1602.         av_freep(&vec);

  1603.     return vec;

  1604. }

  1605. 

  1606. SwsVector *sws_getGaussianVec(double variance, double quality)

  1607. {

  1608.     const int length = (int)(variance * quality + 0.5) | 1;

  1609.     int i;

  1610.     double middle  = (length - 1) * 0.5;

  1611.     SwsVector *vec;

  1612. 

  1613.     if(variance < 0 || quality < 0)

  1614.         return NULL;

  1615. 

  1616.     vec = sws_allocVec(length);

  1617. 

  1618.     if (!vec)

  1619.         return NULL;

  1620. 

  1621.     for (i = 0; i < length; i++) {

  1622.         double dist = i - middle;

  1623.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1624.                         sqrt(2 * variance * M_PI);

  1625.     }

  1626. 

  1627.     sws_normalizeVec(vec, 1.0);

  1628. 

  1629.     return vec;

  1630. }

  1631. 

  1632. SwsVector *sws_getConstVec(double c, int length)

  1633. {

  1634.     int i;

  1635.     SwsVector *vec = sws_allocVec(length);

  1636. 

  1637.     if (!vec)

  1638.         return NULL;

  1639. 

  1640.     for (i = 0; i < length; i++)

  1641.         vec->coeff[i] = c;

  1642. 

  1643.     return vec;

  1644. }

  1645. 

  1646. SwsVector *sws_getIdentityVec(void)

  1647. {

  1648.     return sws_getConstVec(1.0, 1);

  1649. }

  1650. 

  1651. static double sws_dcVec(SwsVector *a)

  1652. {

  1653.     int i;

  1654.     double sum = 0;

  1655. 

  1656.     for (i = 0; i < a->length; i++)

  1657.         sum += a->coeff[i];

  1658. 

  1659.     return sum;

  1660. }

  1661. 

  1662. void sws_scaleVec(SwsVector *a, double scalar)

  1663. {

  1664.     int i;

  1665. 

  1666.     for (i = 0; i < a->length; i++)

  1667.         a->coeff[i] *= scalar;

  1668. }

  1669. 

  1670. void sws_normalizeVec(SwsVector *a, double height)

  1671. {

  1672.     sws_scaleVec(a, height / sws_dcVec(a));

  1673. }

  1674. 

  1675. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1676. {

  1677.     int length = a->length + b->length - 1;

  1678.     int i, j;

  1679.     SwsVector *vec = sws_getConstVec(0.0, length);

  1680. 

  1681.     if (!vec)

  1682.         return NULL;

  1683. 

  1684.     for (i = 0; i < a->length; i++) {

  1685.         for (j = 0; j < b->length; j++) {

  1686.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1687.         }

  1688.     }

  1689. 

  1690.     return vec;

  1691. }

  1692. 

  1693. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1694. {

  1695.     int length = FFMAX(a->length, b->length);

  1696.     int i;

  1697.     SwsVector *vec = sws_getConstVec(0.0, length);

  1698. 

  1699.     if (!vec)

  1700.         return NULL;

  1701. 

  1702.     for (i = 0; i < a->length; i++)

  1703.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

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

  1706. 

  1707.     return vec;

  1708. }

  1709. 

  1710. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1711. {

  1712.     int length = FFMAX(a->length, b->length);

  1713.     int i;

  1714.     SwsVector *vec = sws_getConstVec(0.0, length);

  1715. 

  1716.     if (!vec)

  1717.         return NULL;

  1718. 

  1719.     for (i = 0; i < a->length; i++)

  1720.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

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

  1723. 

  1724.     return vec;

  1725. }

  1726. 

  1727. /* shift left / or right if "shift" is negative */

  1728. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1729. {

  1730.     int length = a->length + FFABS(shift) * 2;

  1731.     int i;

  1732.     SwsVector *vec = sws_getConstVec(0.0, length);

  1733. 

  1734.     if (!vec)

  1735.         return NULL;

  1736. 

  1737.     for (i = 0; i < a->length; i++) {

  1738.         vec->coeff[i + (length    - 1) / 2 -

  1739.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1740.     }

  1741. 

  1742.     return vec;

  1743. }

  1744. 

  1745. void sws_shiftVec(SwsVector *a, int shift)

  1746. {

  1747.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1748.     av_free(a->coeff);

  1749.     a->coeff  = shifted->coeff;

  1750.     a->length = shifted->length;

  1751.     av_free(shifted);

  1752. }

  1753. 

  1754. void sws_addVec(SwsVector *a, SwsVector *b)

  1755. {

  1756.     SwsVector *sum = sws_sumVec(a, b);

  1757.     av_free(a->coeff);

  1758.     a->coeff  = sum->coeff;

  1759.     a->length = sum->length;

  1760.     av_free(sum);

  1761. }

  1762. 

  1763. void sws_subVec(SwsVector *a, SwsVector *b)

  1764. {

  1765.     SwsVector *diff = sws_diffVec(a, b);

  1766.     av_free(a->coeff);

  1767.     a->coeff  = diff->coeff;

  1768.     a->length = diff->length;

  1769.     av_free(diff);

  1770. }

  1771. 

  1772. void sws_convVec(SwsVector *a, SwsVector *b)

  1773. {

  1774.     SwsVector *conv = sws_getConvVec(a, b);

  1775.     av_free(a->coeff);

  1776.     a->coeff  = conv->coeff;

  1777.     a->length = conv->length;

  1778.     av_free(conv);

  1779. }

  1780. 

  1781. SwsVector *sws_cloneVec(SwsVector *a)

  1782. {

  1783.     SwsVector *vec = sws_allocVec(a->length);

  1784. 

  1785.     if (!vec)

  1786.         return NULL;

  1787. 

  1788.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  1789. 

  1790.     return vec;

  1791. }

  1792. 

  1793. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1794. {

  1795.     int i;

  1796.     double max = 0;

  1797.     double min = 0;

  1798.     double range;

  1799. 

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

  1801.         if (a->coeff[i] > max)

  1802.             max = a->coeff[i];

  1803. 

  1804.     for (i = 0; i < a->length; i++)

  1805.         if (a->coeff[i] < min)

  1806.             min = a->coeff[i];

  1807. 

  1808.     range = max - min;

  1809. 

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

  1811.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1812.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1813.         for (; x > 0; x--)

  1814.             av_log(log_ctx, log_level, " ");

  1815.         av_log(log_ctx, log_level, "|\n");

  1816.     }

  1817. }

  1818. 

  1819. void sws_freeVec(SwsVector *a)

  1820. {

  1821.     if (!a)

  1822.         return;

  1823.     av_freep(&a->coeff);

  1824.     a->length = 0;

  1825.     av_free(a);

  1826. }

  1827. 

  1828. void sws_freeFilter(SwsFilter *filter)

  1829. {

  1830.     if (!filter)

  1831.         return;

  1832. 

  1833.     sws_freeVec(filter->lumH);

  1834.     sws_freeVec(filter->lumV);

  1835.     sws_freeVec(filter->chrH);

  1836.     sws_freeVec(filter->chrV);

  1837.     av_free(filter);

  1838. }

  1839. 

  1840. void sws_freeContext(SwsContext *c)

  1841. {

  1842.     int i;

  1843.     if (!c)

  1844.         return;

  1845. 

  1846.     if (c->lumPixBuf) {

  1847.         for (i = 0; i < c->vLumBufSize; i++)

  1848.             av_freep(&c->lumPixBuf[i]);

  1849.         av_freep(&c->lumPixBuf);

  1850.     }

  1851. 

  1852.     if (c->chrUPixBuf) {

  1853.         for (i = 0; i < c->vChrBufSize; i++)

  1854.             av_freep(&c->chrUPixBuf[i]);

  1855.         av_freep(&c->chrUPixBuf);

  1856.         av_freep(&c->chrVPixBuf);

  1857.     }

  1858. 

  1859.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1860.         for (i = 0; i < c->vLumBufSize; i++)

  1861.             av_freep(&c->alpPixBuf[i]);

  1862.         av_freep(&c->alpPixBuf);

  1863.     }

  1864. 

  1865.     for (i = 0; i < 4; i++)

  1866.         av_freep(&c->dither_error[i]);

  1867. 

  1868.     av_freep(&c->vLumFilter);

  1869.     av_freep(&c->vChrFilter);

  1870.     av_freep(&c->hLumFilter);

  1871.     av_freep(&c->hChrFilter);

  1872. #if HAVE_ALTIVEC

  1873.     av_freep(&c->vYCoeffsBank);

  1874.     av_freep(&c->vCCoeffsBank);

  1875. #endif

  1876. 

  1877.     av_freep(&c->vLumFilterPos);

  1878.     av_freep(&c->vChrFilterPos);

  1879.     av_freep(&c->hLumFilterPos);

  1880.     av_freep(&c->hChrFilterPos);

  1881. 

  1882. #if HAVE_MMX_INLINE

  1883. #if USE_MMAP

  1884.     if (c->lumMmxextFilterCode)

  1885.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1886.     if (c->chrMmxextFilterCode)

  1887.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1888. #elif HAVE_VIRTUALALLOC

  1889.     if (c->lumMmxextFilterCode)

  1890.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1891.     if (c->chrMmxextFilterCode)

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

  1893. #else

  1894.     av_free(c->lumMmxextFilterCode);

  1895.     av_free(c->chrMmxextFilterCode);

  1896. #endif

  1897.     c->lumMmxextFilterCode = NULL;

  1898.     c->chrMmxextFilterCode = NULL;

  1899. #endif /* HAVE_MMX_INLINE */

  1900. 

  1901.     av_freep(&c->yuvTable);

  1902.     av_freep(&c->formatConvBuffer);

  1903. 

  1904.     av_free(c);

  1905. }

  1906. 

  1907. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1908.                                         int srcH, enum AVPixelFormat srcFormat,

  1909.                                         int dstW, int dstH,

  1910.                                         enum AVPixelFormat dstFormat, int flags,

  1911.                                         SwsFilter *srcFilter,

  1912.                                         SwsFilter *dstFilter,

  1913.                                         const double *param)

  1914. {

  1915.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1916.                                              SWS_PARAM_DEFAULT };

  1917. 

  1918.     if (!param)

  1919.         param = default_param;

  1920. 

  1921.     if (context &&

  1922.         (context->srcW      != srcW      ||

  1923.          context->srcH      != srcH      ||

  1924.          context->srcFormat != srcFormat ||

  1925.          context->dstW      != dstW      ||

  1926.          context->dstH      != dstH      ||

  1927.          context->dstFormat != dstFormat ||

  1928.          context->flags     != flags     ||

  1929.          context->param[0]  != param[0]  ||

  1930.          context->param[1]  != param[1])) {

  1931.         sws_freeContext(context);

  1932.         context = NULL;

  1933.     }

  1934. 

  1935.     if (!context) {

  1936.         if (!(context = sws_alloc_context()))

  1937.             return NULL;

  1938.         context->srcW      = srcW;

  1939.         context->srcH      = srcH;

  1940.         context->srcFormat = srcFormat;

  1941.         context->dstW      = dstW;

  1942.         context->dstH      = dstH;

  1943.         context->dstFormat = dstFormat;

  1944.         context->flags     = flags;

  1945.         context->param[0]  = param[0];

  1946.         context->param[1]  = param[1];

  1947.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1948.             sws_freeContext(context);

  1949.             return NULL;

  1950.         }

  1951.     }

  1952.     return context;

  1953. }