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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 _DEFAULT_SOURCE

  24. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  25. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  26. #include <inttypes.h>

  27. #include <math.h>

  28. #include <stdio.h>

  29. #include <string.h>

  30. #if HAVE_SYS_MMAN_H

  31. #include <sys/mman.h>

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

  33. #define MAP_ANONYMOUS MAP_ANON

  34. #endif

  35. #endif

  36. #if HAVE_VIRTUALALLOC

  37. #define WIN32_LEAN_AND_MEAN

  38. #include <windows.h>

  39. #endif

  40. 

  41. #include "libavutil/attributes.h"

  42. #include "libavutil/avassert.h"

  43. #include "libavutil/avutil.h"

  44. #include "libavutil/bswap.h"

  45. #include "libavutil/cpu.h"

  46. #include "libavutil/imgutils.h"

  47. #include "libavutil/intreadwrite.h"

  48. #include "libavutil/libm.h"

  49. #include "libavutil/mathematics.h"

  50. #include "libavutil/opt.h"

  51. #include "libavutil/pixdesc.h"

  52. #include "libavutil/aarch64/cpu.h"

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

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

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

  56. #include "rgb2rgb.h"

  57. #include "swscale.h"

  58. #include "swscale_internal.h"

  59. 

  60. static void handle_formats(SwsContext *c);

  61. 

  62. unsigned swscale_version(void)

  63. {

  64.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  65.     return LIBSWSCALE_VERSION_INT;

  66. }

  67. 

  68. const char *swscale_configuration(void)

  69. {

  70.     return FFMPEG_CONFIGURATION;

  71. }

  72. 

  73. const char *swscale_license(void)

  74. {

  75. #define LICENSE_PREFIX "libswscale license: "

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

  77. }

  78. 

  79. typedef struct FormatEntry {

  80.     uint8_t is_supported_in         :1;

  81.     uint8_t is_supported_out        :1;

  82.     uint8_t is_supported_endianness :1;

  83. } FormatEntry;

  84. 

  85. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  125.     [AV_PIX_FMT_YUV440P10LE] = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  210.     [AV_PIX_FMT_GBRAP12LE]   = { 1, 0 },

  211.     [AV_PIX_FMT_GBRAP12BE]   = { 1, 0 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  234.     [AV_PIX_FMT_P010LE]      = { 1, 0 },

  235.     [AV_PIX_FMT_P010BE]      = { 1, 0 },

  236. };

  237. 

  238. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  239. {

  240.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  241.            format_entries[pix_fmt].is_supported_in : 0;

  242. }

  243. 

  244. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  245. {

  246.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  247.            format_entries[pix_fmt].is_supported_out : 0;

  248. }

  249. 

  250. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  251. {

  252.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  253.            format_entries[pix_fmt].is_supported_endianness : 0;

  254. }

  255. 

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

  257.                              double dist)

  258. {

  259.     if (dist <= 1.0)

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

  261.     else

  262.         return getSplineCoeff(0.0,

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

  264.                                c + 3.0 * d,

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

  266.                               dist - 1.0);

  267. }

  268. 

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

  270. {

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

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

  273.     }

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

  275.     return pos >> chr_subsample;

  276. }

  277. 

  278. typedef struct {

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

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

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

  282. } ScaleAlgorithm;

  283. 

  284. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  296. };

  297. 

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

  299.                               int *outFilterSize, int xInc, int srcW,

  300.                               int dstW, int filterAlign, int one,

  301.                               int flags, int cpu_flags,

  302.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  304. {

  305.     int i;

  306.     int filterSize;

  307.     int filter2Size;

  308.     int minFilterSize;

  309.     int64_t *filter    = NULL;

  310.     int64_t *filter2   = NULL;

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

  312.     int ret            = -1;

  313. 

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

  315. 

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

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

  318. 

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

  320.         int i;

  321.         filterSize = 1;

  322.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  324. 

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

  326.             filter[i * filterSize] = fone;

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

  328.         }

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

  330.         int i;

  331.         int64_t xDstInSrc;

  332.         filterSize = 1;

  333.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  335. 

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

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

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

  339. 

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

  341.             filter[i]       = fone;

  342.             xDstInSrc      += xInc;

  343.         }

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

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

  346.         int i;

  347.         int64_t xDstInSrc;

  348.         filterSize = 2;

  349.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  351. 

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

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

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

  355.             int j;

  356. 

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

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

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

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

  361.                 if (coeff < 0)

  362.                     coeff = 0;

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

  364.                 xx++;

  365.             }

  366.             xDstInSrc += xInc;

  367.         }

  368.     } else {

  369.         int64_t xDstInSrc;

  370.         int sizeFactor = -1;

  371. 

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

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

  374.                 sizeFactor = scale_algorithms[i].size_factor;

  375.                 break;

  376.             }

  377.         }

  378.         if (flags & SWS_LANCZOS)

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

  380.         av_assert0(sizeFactor > 0);

  381. 

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

  383.             filterSize = 1 + sizeFactor;    // upscale

  384.         else

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

  386. 

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

  388.         filterSize = FFMAX(filterSize, 1);

  389. 

  390.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  392. 

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

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

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

  396.             int j;

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

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

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

  400.                 double floatd;

  401.                 int64_t coeff;

  402. 

  403.                 if (xInc > 1 << 16)

  404.                     d = d * dstW / srcW;

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

  406. 

  407.                 if (flags & SWS_BICUBIC) {

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

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

  410. 

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

  412.                         coeff = 0.0;

  413.                     } else {

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

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

  416. 

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

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

  419.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  420.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  421.                         else

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

  423.                                       (6 * B + 30 * C) * dd  +

  424.                                     (-12 * B - 48 * C) * d   +

  425.                                       (8 * B + 24 * C) * (1 << 30);

  426.                     }

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

  428.                 }

  429. #if 0

  430.                 else if (flags & SWS_X) {

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

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

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

  434.                 }

  435. #endif

  436.                 else if (flags & SWS_X) {

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

  438.                     double c;

  439. 

  440.                     if (floatd < 1.0)

  441.                         c = cos(floatd * M_PI);

  442.                     else

  443.                         c = -1.0;

  444.                     if (c < 0.0)

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

  446.                     else

  447.                         c = pow(c, A);

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

  449.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  455.                     else

  456.                         coeff = 0.0;

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

  458.                 } else if (flags & SWS_GAUSS) {

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

  460.                     coeff = exp2(-p * floatd * floatd) * fone;

  461.                 } else if (flags & SWS_SINC) {

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

  463.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  467.                     if (floatd > p)

  468.                         coeff = 0;

  469.                 } else if (flags & SWS_BILINEAR) {

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

  471.                     if (coeff < 0)

  472.                         coeff = 0;

  473.                     coeff *= fone >> 30;

  474.                 } else if (flags & SWS_SPLINE) {

  475.                     double p = -2.196152422706632;

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

  477.                 } else {

  478.                     av_assert0(0);

  479.                 }

  480. 

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

  482.                 xx++;

  483.             }

  484.             xDstInSrc += 2 * xInc;

  485.         }

  486.     }

  487. 

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

  489.      * av_free(filter);

  490.      */

  491.     av_assert0(filterSize > 0);

  492.     filter2Size = filterSize;

  493.     if (srcFilter)

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

  495.     if (dstFilter)

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

  497.     av_assert0(filter2Size > 0);

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

  499. 

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

  501.         int j, k;

  502. 

  503.         if (srcFilter) {

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

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

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

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

  508.             }

  509.         } else {

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

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

  512.         }

  513.         // FIXME dstFilter

  514. 

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

  516.     }

  517.     av_freep(&filter);

  518. 

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

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

  521.     minFilterSize = 0;

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

  523.         int min = filter2Size;

  524.         int j;

  525.         int64_t cutOff = 0.0;

  526. 

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

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

  529.             int k;

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

  531. 

  532.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  533.                 break;

  534. 

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

  536.              * filter otherwise */

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

  538.                 break;

  539. 

  540.             // move filter coefficients left

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

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

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

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

  545.         }

  546. 

  547.         cutOff = 0;

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

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

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

  551. 

  552.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  553.                 break;

  554.             min--;

  555.         }

  556. 

  557.         if (min > minFilterSize)

  558.             minFilterSize = min;

  559.     }

  560. 

  561.     if (PPC_ALTIVEC(cpu_flags)) {

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

  563.         if (minFilterSize < 5)

  564.             filterAlign = 4;

  565. 

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

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

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

  569.         if (minFilterSize < 3)

  570.             filterAlign = 1;

  571.     }

  572. 

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

  574.         // special case for unscaled vertical filtering

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

  576.             filterAlign = 1;

  577.     }

  578. 

  579.     av_assert0(minFilterSize > 0);

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

  581.     av_assert0(filterSize > 0);

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

  583.     if (!filter)

  584.         goto fail;

  585.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  587.         ret = RETCODE_USE_CASCADE;

  588.         goto fail;

  589.     }

  590.     *outFilterSize = filterSize;

  591. 

  592.     if (flags & SWS_PRINT_INFO)

  593.         av_log(NULL, AV_LOG_VERBOSE,

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

  595.                filter2Size, filterSize);

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

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

  598.         int j;

  599. 

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

  601.             if (j >= filter2Size)

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

  603.             else

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

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

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

  607.         }

  608.     }

  609. 

  610.     // FIXME try to align filterPos if possible

  611. 

  612.     // fix borders

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

  614.         int j;

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

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

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

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

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

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

  621.             }

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

  623.         }

  624. 

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

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

  627.             int64_t acc = 0;

  628. 

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

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

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

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

  633.                 }

  634.             }

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

  636.                 if (j < shift) {

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

  638.                 } else {

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

  640.                 }

  641.             }

  642. 

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

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

  645.         }

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

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

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

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

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

  651.             }

  652.         }

  653.     }

  654. 

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

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

  657.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  659. 

  660.     /* normalize & store in outFilter */

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

  662.         int j;

  663.         int64_t error = 0;

  664.         int64_t sum   = 0;

  665. 

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

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

  668.         }

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

  670.         if (!sum) {

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

  672.             sum = 1;

  673.         }

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

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

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

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

  678.             error                                  = v - intV * sum;

  679.         }

  680.     }

  681. 

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

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

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

  685.                                                       * read over the end */

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

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

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

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

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

  691.     }

  692. 

  693.     ret = 0;

  694. 

  695. fail:

  696.     if(ret < 0)

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

  698.     av_free(filter);

  699.     av_free(filter2);

  700.     return ret;

  701. }

  702. 

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

  704. {

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

  706.     int64_t vr =  table[0];

  707.     int64_t ub =  table[1];

  708.     int64_t ug = -table[2];

  709.     int64_t vg = -table[3];

  710.     int64_t ONE = 65536;

  711.     int64_t cy = ONE;

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

  713.     int i;

  714.     static const int8_t map[] = {

  715.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  716.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  717.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  718.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  719.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  720.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  721.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  722.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  723.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  724.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  725.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  726.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  727.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  728.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  729.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  730.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  731.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  732.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  733.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  734.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  735.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  736.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  737.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  738.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  739.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  740.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  741.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  742.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  743.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  744.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  745.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  746.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  750.     };

  751. 

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

  753. 

  754.     if (!dstRange) {

  755.         cy = cy * 255 / 219;

  756.     } else {

  757.         vr = vr * 224 / 255;

  758.         ub = ub * 224 / 255;

  759.         ug = ug * 224 / 255;

  760.         vg = vg * 224 / 255;

  761.     }

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

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

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

  765. 

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

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

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

  769. 

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

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

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

  773. 

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

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

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

  777. 

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

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

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

  781. 

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

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

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

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

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

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

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

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

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

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

  792.     }

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

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

  795. }

  796. 

  797. static void fill_xyztables(struct SwsContext *c)

  798. {

  799.     int i;

  800.     double xyzgamma = XYZ_GAMMA;

  801.     double rgbgamma = 1.0 / RGB_GAMMA;

  802.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  803.     double rgbgammainv = RGB_GAMMA;

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

  805.         {13270, -6295, -2041},

  806.         {-3969,  7682,   170},

  807.         {  228,  -835,  4329} };

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

  809.         {1689, 1464,  739},

  810.         { 871, 2929,  296},

  811.         {  79,  488, 3891} };

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

  813. 

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

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

  816.     c->xyzgamma = xyzgamma_tab;

  817.     c->rgbgamma = rgbgamma_tab;

  818.     c->xyzgammainv = xyzgammainv_tab;

  819.     c->rgbgammainv = rgbgammainv_tab;

  820. 

  821.     if (rgbgamma_tab[4095])

  822.         return;

  823. 

  824.     /* set gamma vectors */

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

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

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

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

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

  830.     }

  831. }

  832. 

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

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

  835.                              int brightness, int contrast, int saturation)

  836. {

  837.     const AVPixFmtDescriptor *desc_dst;

  838.     const AVPixFmtDescriptor *desc_src;

  839.     int need_reinit = 0;

  840. 

  841.     handle_formats(c);

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

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

  844. 

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

  846.         dstRange = 0;

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

  848.         srcRange = 0;

  849. 

  850.     if (c->srcRange != srcRange ||

  851.         c->dstRange != dstRange ||

  852.         c->brightness != brightness ||

  853.         c->contrast   != contrast ||

  854.         c->saturation != saturation ||

  855.         memcmp(c->srcColorspaceTable, inv_table, sizeof(int) * 4) ||

  856.         memcmp(c->dstColorspaceTable,     table, sizeof(int) * 4)

  857.     )

  858.         need_reinit = 1;

  859. 

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

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

  862. 

  863. 

  864. 

  865.     c->brightness = brightness;

  866.     c->contrast   = contrast;

  867.     c->saturation = saturation;

  868.     c->srcRange   = srcRange;

  869.     c->dstRange   = dstRange;

  870. 

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

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

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

  874.         ff_sws_init_range_convert(c);

  875. 

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

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

  878. 

  879.     if (c->cascaded_context[c->cascaded_mainindex])

  880.         return sws_setColorspaceDetails(c->cascaded_context[c->cascaded_mainindex],inv_table, srcRange,table, dstRange, brightness,  contrast, saturation);

  881. 

  882.     if (!need_reinit)

  883.         return 0;

  884. 

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

  886.         if (!c->cascaded_context[0] &&

  887.             memcmp(c->dstColorspaceTable, c->srcColorspaceTable, sizeof(int) * 4) &&

  888.             c->srcW && c->srcH && c->dstW && c->dstH) {

  889.             enum AVPixelFormat tmp_format;

  890.             int tmp_width, tmp_height;

  891.             int srcW = c->srcW;

  892.             int srcH = c->srcH;

  893.             int dstW = c->dstW;

  894.             int dstH = c->dstH;

  895.             int ret;

  896.             av_log(c, AV_LOG_VERBOSE, "YUV color matrix differs for YUV->YUV, using intermediate RGB to convert\n");

  897. 

  898.             if (isNBPS(c->dstFormat) || is16BPS(c->dstFormat)) {

  899.                 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {

  900.                     tmp_format = AV_PIX_FMT_BGRA64;

  901.                 } else {

  902.                     tmp_format = AV_PIX_FMT_BGR48;

  903.                 }

  904.             } else {

  905.                 if (isALPHA(c->srcFormat) && isALPHA(c->dstFormat)) {

  906.                     tmp_format = AV_PIX_FMT_BGRA;

  907.                 } else {

  908.                     tmp_format = AV_PIX_FMT_BGR24;

  909.                 }

  910.             }

  911. 

  912.             if (srcW*srcH > dstW*dstH) {

  913.                 tmp_width  = dstW;

  914.                 tmp_height = dstH;

  915.             } else {

  916.                 tmp_width  = srcW;

  917.                 tmp_height = srcH;

  918.             }

  919. 

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

  921.                                 tmp_width, tmp_height, tmp_format, 64);

  922.             if (ret < 0)

  923.                 return ret;

  924. 

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

  926.                                                         tmp_width, tmp_height, tmp_format,

  927.                                                         c->flags, c->param);

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

  929.                 return -1;

  930. 

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

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

  933.             if (ret < 0)

  934.                 return ret;

  935.             //we set both src and dst depending on that the RGB side will be ignored

  936.             sws_setColorspaceDetails(c->cascaded_context[0], inv_table,

  937.                                      srcRange, table, dstRange,

  938.                                      brightness, contrast, saturation);

  939. 

  940.             c->cascaded_context[1] = sws_getContext(tmp_width, tmp_height, tmp_format,

  941.                                                     dstW, dstH, c->dstFormat,

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

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

  944.                 return -1;

  945.             sws_setColorspaceDetails(c->cascaded_context[1], inv_table,

  946.                                      srcRange, table, dstRange,

  947.                                      0, 1 << 16, 1 << 16);

  948.             return 0;

  949.         }

  950.         return -1;

  951.     }

  952. 

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

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

  955.                                  contrast, saturation);

  956.         // FIXME factorize

  957. 

  958.         if (ARCH_PPC)

  959.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  960.                                        contrast, saturation);

  961.     }

  962. 

  963.     fill_rgb2yuv_table(c, table, dstRange);

  964. 

  965.     return 0;

  966. }

  967. 

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

  969.                              int *srcRange, int **table, int *dstRange,

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

  971. {

  972.     if (!c )

  973.         return -1;

  974. 

  975.     *inv_table  = c->srcColorspaceTable;

  976.     *table      = c->dstColorspaceTable;

  977.     *srcRange   = c->srcRange;

  978.     *dstRange   = c->dstRange;

  979.     *brightness = c->brightness;

  980.     *contrast   = c->contrast;

  981.     *saturation = c->saturation;

  982. 

  983.     return 0;

  984. }

  985. 

  986. static int handle_jpeg(enum AVPixelFormat *format)

  987. {

  988.     switch (*format) {

  989.     case AV_PIX_FMT_YUVJ420P:

  990.         *format = AV_PIX_FMT_YUV420P;

  991.         return 1;

  992.     case AV_PIX_FMT_YUVJ411P:

  993.         *format = AV_PIX_FMT_YUV411P;

  994.         return 1;

  995.     case AV_PIX_FMT_YUVJ422P:

  996.         *format = AV_PIX_FMT_YUV422P;

  997.         return 1;

  998.     case AV_PIX_FMT_YUVJ444P:

  999.         *format = AV_PIX_FMT_YUV444P;

  1000.         return 1;

  1001.     case AV_PIX_FMT_YUVJ440P:

  1002.         *format = AV_PIX_FMT_YUV440P;

  1003.         return 1;

  1004.     case AV_PIX_FMT_GRAY8:

  1005.     case AV_PIX_FMT_YA8:

  1006.     case AV_PIX_FMT_GRAY16LE:

  1007.     case AV_PIX_FMT_GRAY16BE:

  1008.     case AV_PIX_FMT_YA16BE:

  1009.     case AV_PIX_FMT_YA16LE:

  1010.         return 1;

  1011.     default:

  1012.         return 0;

  1013.     }

  1014. }

  1015. 

  1016. static int handle_0alpha(enum AVPixelFormat *format)

  1017. {

  1018.     switch (*format) {

  1019.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1020.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1021.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1022.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1023.     default:                                          return 0;

  1024.     }

  1025. }

  1026. 

  1027. static int handle_xyz(enum AVPixelFormat *format)

  1028. {

  1029.     switch (*format) {

  1030.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1031.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1032.     default:                                                return 0;

  1033.     }

  1034. }

  1035. 

  1036. static void handle_formats(SwsContext *c)

  1037. {

  1038.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1039.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1040.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1041.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1042.     if (c->srcXYZ || c->dstXYZ)

  1043.         fill_xyztables(c);

  1044. }

  1045. 

  1046. SwsContext *sws_alloc_context(void)

  1047. {

  1048.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1049. 

  1050.     av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));

  1051. 

  1052.     if (c) {

  1053.         c->av_class = &ff_sws_context_class;

  1054.         av_opt_set_defaults(c);

  1055.     }

  1056. 

  1057.     return c;

  1058. }

  1059. 

  1060. static uint16_t * alloc_gamma_tbl(double e)

  1061. {

  1062.     int i = 0;

  1063.     uint16_t * tbl;

  1064.     tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);

  1065.     if (!tbl)

  1066.         return NULL;

  1067. 

  1068.     for (i = 0; i < 65536; ++i) {

  1069.         tbl[i] = pow(i / 65535.0, e) * 65535.0;

  1070.     }

  1071.     return tbl;

  1072. }

  1073. 

  1074. static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)

  1075. {

  1076.     switch(fmt) {

  1077.     case AV_PIX_FMT_ARGB:       return AV_PIX_FMT_RGB24;

  1078.     case AV_PIX_FMT_RGBA:       return AV_PIX_FMT_RGB24;

  1079.     case AV_PIX_FMT_ABGR:       return AV_PIX_FMT_BGR24;

  1080.     case AV_PIX_FMT_BGRA:       return AV_PIX_FMT_BGR24;

  1081.     case AV_PIX_FMT_YA8:        return AV_PIX_FMT_GRAY8;

  1082. 

  1083.     case AV_PIX_FMT_YUVA420P:   return AV_PIX_FMT_YUV420P;

  1084.     case AV_PIX_FMT_YUVA422P:   return AV_PIX_FMT_YUV422P;

  1085.     case AV_PIX_FMT_YUVA444P:           return AV_PIX_FMT_YUV444P;

  1086. 

  1087.     case AV_PIX_FMT_GBRAP:              return AV_PIX_FMT_GBRP;

  1088. 

  1089.     case AV_PIX_FMT_GBRAP12LE:          return AV_PIX_FMT_GBRP12;

  1090.     case AV_PIX_FMT_GBRAP12BE:          return AV_PIX_FMT_GBRP12;

  1091. 

  1092.     case AV_PIX_FMT_GBRAP16LE:          return AV_PIX_FMT_GBRP16;

  1093.     case AV_PIX_FMT_GBRAP16BE:          return AV_PIX_FMT_GBRP16;

  1094. 

  1095.     case AV_PIX_FMT_RGBA64LE:   return AV_PIX_FMT_RGB48;

  1096.     case AV_PIX_FMT_RGBA64BE:   return AV_PIX_FMT_RGB48;

  1097.     case AV_PIX_FMT_BGRA64LE:   return AV_PIX_FMT_BGR48;

  1098.     case AV_PIX_FMT_BGRA64BE:   return AV_PIX_FMT_BGR48;

  1099. 

  1100.     case AV_PIX_FMT_YA16BE:             return AV_PIX_FMT_GRAY16;

  1101.     case AV_PIX_FMT_YA16LE:             return AV_PIX_FMT_GRAY16;

  1102. 

  1103.     case AV_PIX_FMT_YUVA420P9BE:        return AV_PIX_FMT_YUV420P9;

  1104.     case AV_PIX_FMT_YUVA422P9BE:        return AV_PIX_FMT_YUV422P9;

  1105.     case AV_PIX_FMT_YUVA444P9BE:        return AV_PIX_FMT_YUV444P9;

  1106.     case AV_PIX_FMT_YUVA420P9LE:        return AV_PIX_FMT_YUV420P9;

  1107.     case AV_PIX_FMT_YUVA422P9LE:        return AV_PIX_FMT_YUV422P9;

  1108.     case AV_PIX_FMT_YUVA444P9LE:        return AV_PIX_FMT_YUV444P9;

  1109.     case AV_PIX_FMT_YUVA420P10BE:       return AV_PIX_FMT_YUV420P10;

  1110.     case AV_PIX_FMT_YUVA422P10BE:       return AV_PIX_FMT_YUV422P10;

  1111.     case AV_PIX_FMT_YUVA444P10BE:       return AV_PIX_FMT_YUV444P10;

  1112.     case AV_PIX_FMT_YUVA420P10LE:       return AV_PIX_FMT_YUV420P10;

  1113.     case AV_PIX_FMT_YUVA422P10LE:       return AV_PIX_FMT_YUV422P10;

  1114.     case AV_PIX_FMT_YUVA444P10LE:       return AV_PIX_FMT_YUV444P10;

  1115.     case AV_PIX_FMT_YUVA420P16BE:       return AV_PIX_FMT_YUV420P16;

  1116.     case AV_PIX_FMT_YUVA422P16BE:       return AV_PIX_FMT_YUV422P16;

  1117.     case AV_PIX_FMT_YUVA444P16BE:       return AV_PIX_FMT_YUV444P16;

  1118.     case AV_PIX_FMT_YUVA420P16LE:       return AV_PIX_FMT_YUV420P16;

  1119.     case AV_PIX_FMT_YUVA422P16LE:       return AV_PIX_FMT_YUV422P16;

  1120.     case AV_PIX_FMT_YUVA444P16LE:       return AV_PIX_FMT_YUV444P16;

  1121. 

  1122. //     case AV_PIX_FMT_AYUV64LE:

  1123. //     case AV_PIX_FMT_AYUV64BE:

  1124. //     case AV_PIX_FMT_PAL8:

  1125.     default: return AV_PIX_FMT_NONE;

  1126.     }

  1127. }

  1128. 

  1129. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1130.                              SwsFilter *dstFilter)

  1131. {

  1132.     int i, j;

  1133.     int usesVFilter, usesHFilter;

  1134.     int unscaled;

  1135.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1136.     int srcW              = c->srcW;

  1137.     int srcH              = c->srcH;

  1138.     int dstW              = c->dstW;

  1139.     int dstH              = c->dstH;

  1140.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1141.     int flags, cpu_flags;

  1142.     enum AVPixelFormat srcFormat = c->srcFormat;

  1143.     enum AVPixelFormat dstFormat = c->dstFormat;

  1144.     const AVPixFmtDescriptor *desc_src;

  1145.     const AVPixFmtDescriptor *desc_dst;

  1146.     int ret = 0;

  1147.     enum AVPixelFormat tmpFmt;

  1148. 

  1149.     cpu_flags = av_get_cpu_flags();

  1150.     flags     = c->flags;

  1151.     emms_c();

  1152.     if (!rgb15to16)

  1153.         ff_sws_rgb2rgb_init();

  1154. 

  1155.     unscaled = (srcW == dstW && srcH == dstH);

  1156. 

  1157.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1158.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1159. 

  1160.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1161.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1162. 

  1163.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1164.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1165.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1166.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1167. 

  1168.     handle_formats(c);

  1169.     srcFormat = c->srcFormat;

  1170.     dstFormat = c->dstFormat;

  1171.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1172.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1173. 

  1174.     // If the source has no alpha then disable alpha blendaway

  1175.     if (c->src0Alpha)

  1176.         c->alphablend = SWS_ALPHA_BLEND_NONE;

  1177. 

  1178.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1179.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1180.     if (!sws_isSupportedInput(srcFormat)) {

  1181.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1182.                av_get_pix_fmt_name(srcFormat));

  1183.         return AVERROR(EINVAL);

  1184.     }

  1185.     if (!sws_isSupportedOutput(dstFormat)) {

  1186.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1187.                av_get_pix_fmt_name(dstFormat));

  1188.         return AVERROR(EINVAL);

  1189.     }

  1190.     }

  1191.     av_assert2(desc_src && desc_dst);

  1192. 

  1193.     i = flags & (SWS_POINT         |

  1194.                  SWS_AREA          |

  1195.                  SWS_BILINEAR      |

  1196.                  SWS_FAST_BILINEAR |

  1197.                  SWS_BICUBIC       |

  1198.                  SWS_X             |

  1199.                  SWS_GAUSS         |

  1200.                  SWS_LANCZOS       |

  1201.                  SWS_SINC          |

  1202.                  SWS_SPLINE        |

  1203.                  SWS_BICUBLIN);

  1204. 

  1205.     /* provide a default scaler if not set by caller */

  1206.     if (!i) {

  1207.         if (dstW < srcW && dstH < srcH)

  1208.             flags |= SWS_BICUBIC;

  1209.         else if (dstW > srcW && dstH > srcH)

  1210.             flags |= SWS_BICUBIC;

  1211.         else

  1212.             flags |= SWS_BICUBIC;

  1213.         c->flags = flags;

  1214.     } else if (i & (i - 1)) {

  1215.         av_log(c, AV_LOG_ERROR,

  1216.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1217.         return AVERROR(EINVAL);

  1218.     }

  1219.     /* sanity check */

  1220.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1221.         /* FIXME check if these are enough and try to lower them after

  1222.          * fixing the relevant parts of the code */

  1223.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1224.                srcW, srcH, dstW, dstH);

  1225.         return AVERROR(EINVAL);

  1226.     }

  1227.     if (flags & SWS_FAST_BILINEAR) {

  1228.         if (srcW < 8 || dstW < 8) {

  1229.             flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;

  1230.             c->flags = flags;

  1231.         }

  1232.     }

  1233. 

  1234.     if (!dstFilter)

  1235.         dstFilter = &dummyFilter;

  1236.     if (!srcFilter)

  1237.         srcFilter = &dummyFilter;

  1238. 

  1239.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1240.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1241.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1242.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1243.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1244. 

  1245.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1246.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1247.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1248.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1249.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1250.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1251.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1252.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1253. 

  1254.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1255.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1256. 

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

  1258.         if (dstW&1) {

  1259.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1260.             flags |= SWS_FULL_CHR_H_INT;

  1261.             c->flags = flags;

  1262.         }

  1263. 

  1264.         if (   c->chrSrcHSubSample == 0

  1265.             && c->chrSrcVSubSample == 0

  1266.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1267.             && !(c->flags & SWS_FAST_BILINEAR)

  1268.         ) {

  1269.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1270.             flags |= SWS_FULL_CHR_H_INT;

  1271.             c->flags = flags;

  1272.         }

  1273.     }

  1274. 

  1275.     if (c->dither == SWS_DITHER_AUTO) {

  1276.         if (flags & SWS_ERROR_DIFFUSION)

  1277.             c->dither = SWS_DITHER_ED;

  1278.     }

  1279. 

  1280.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1281.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1282.        dstFormat == AV_PIX_FMT_BGR8 ||

  1283.        dstFormat == AV_PIX_FMT_RGB8) {

  1284.         if (c->dither == SWS_DITHER_AUTO)

  1285.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1286.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1287.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1288.                 av_log(c, AV_LOG_DEBUG,

  1289.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1290.                     av_get_pix_fmt_name(dstFormat));

  1291.                 flags   |= SWS_FULL_CHR_H_INT;

  1292.                 c->flags = flags;

  1293.             }

  1294.         }

  1295.         if (flags & SWS_FULL_CHR_H_INT) {

  1296.             if (c->dither == SWS_DITHER_BAYER) {

  1297.                 av_log(c, AV_LOG_DEBUG,

  1298.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1299.                     av_get_pix_fmt_name(dstFormat));

  1300.                 c->dither = SWS_DITHER_ED;

  1301.             }

  1302.         }

  1303.     }

  1304.     if (isPlanarRGB(dstFormat)) {

  1305.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1306.             av_log(c, AV_LOG_DEBUG,

  1307.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1308.                    av_get_pix_fmt_name(dstFormat));

  1309.             flags   |= SWS_FULL_CHR_H_INT;

  1310.             c->flags = flags;

  1311.         }

  1312.     }

  1313. 

  1314.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1315.      * chroma interpolation */

  1316.     if (flags & SWS_FULL_CHR_H_INT &&

  1317.         isAnyRGB(dstFormat)        &&

  1318.         !isPlanarRGB(dstFormat)    &&

  1319.         dstFormat != AV_PIX_FMT_RGBA64LE &&

  1320.         dstFormat != AV_PIX_FMT_RGBA64BE &&

  1321.         dstFormat != AV_PIX_FMT_BGRA64LE &&

  1322.         dstFormat != AV_PIX_FMT_BGRA64BE &&

  1323.         dstFormat != AV_PIX_FMT_RGB48LE &&

  1324.         dstFormat != AV_PIX_FMT_RGB48BE &&

  1325.         dstFormat != AV_PIX_FMT_BGR48LE &&

  1326.         dstFormat != AV_PIX_FMT_BGR48BE &&

  1327.         dstFormat != AV_PIX_FMT_RGBA  &&

  1328.         dstFormat != AV_PIX_FMT_ARGB  &&

  1329.         dstFormat != AV_PIX_FMT_BGRA  &&

  1330.         dstFormat != AV_PIX_FMT_ABGR  &&

  1331.         dstFormat != AV_PIX_FMT_RGB24 &&

  1332.         dstFormat != AV_PIX_FMT_BGR24 &&

  1333.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1334.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1335.         dstFormat != AV_PIX_FMT_BGR8 &&

  1336.         dstFormat != AV_PIX_FMT_RGB8

  1337.     ) {

  1338.         av_log(c, AV_LOG_WARNING,

  1339.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1340.                av_get_pix_fmt_name(dstFormat));

  1341.         flags   &= ~SWS_FULL_CHR_H_INT;

  1342.         c->flags = flags;

  1343.     }

  1344.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1345.         c->chrDstHSubSample = 1;

  1346. 

  1347.     // drop some chroma lines if the user wants it

  1348.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1349.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1350.     c->chrSrcVSubSample += c->vChrDrop;

  1351. 

  1352.     /* drop every other pixel for chroma calculation unless user

  1353.      * wants full chroma */

  1354.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1355.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1356.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1357.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1358.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1359.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1360.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1361.         srcFormat != AV_PIX_FMT_GBRAP12BE && srcFormat != AV_PIX_FMT_GBRAP12LE &&

  1362.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1363.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1364.         srcFormat != AV_PIX_FMT_GBRAP16BE  && srcFormat != AV_PIX_FMT_GBRAP16LE &&

  1365.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1366.          (flags & SWS_FAST_BILINEAR)))

  1367.         c->chrSrcHSubSample = 1;

  1368. 

  1369.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1370.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1371.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1372.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1373.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1374. 

  1375.     FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1376. 

  1377.     c->srcBpc = desc_src->comp[0].depth;

  1378.     if (c->srcBpc < 8)

  1379.         c->srcBpc = 8;

  1380.     c->dstBpc = desc_dst->comp[0].depth;

  1381.     if (c->dstBpc < 8)

  1382.         c->dstBpc = 8;

  1383.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1384.         c->srcBpc = 16;

  1385.     if (c->dstBpc == 16)

  1386.         dst_stride <<= 1;

  1387. 

  1388.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1389.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1390.                              c->chrDstW >= c->chrSrcW &&

  1391.                              (srcW & 15) == 0;

  1392.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1393. 

  1394.             && (flags & SWS_FAST_BILINEAR)) {

  1395.             if (flags & SWS_PRINT_INFO)

  1396.                 av_log(c, AV_LOG_INFO,

  1397.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1398.         }

  1399.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1400.             c->canMMXEXTBeUsed = 0;

  1401.     } else

  1402.         c->canMMXEXTBeUsed = 0;

  1403. 

  1404.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1405.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1406. 

  1407.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1408.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1409.      * correct scaling.

  1410.      * n-2 is the last chrominance sample available.

  1411.      * This is not perfect, but no one should notice the difference, the more

  1412.      * correct variant would be like the vertical one, but that would require

  1413.      * some special code for the first and last pixel */

  1414.     if (flags & SWS_FAST_BILINEAR) {

  1415.         if (c->canMMXEXTBeUsed) {

  1416.             c->lumXInc += 20;

  1417.             c->chrXInc += 20;

  1418.         }

  1419.         // we don't use the x86 asm scaler if MMX is available

  1420.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1421.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1422.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1423.         }

  1424.     }

  1425. 

  1426.     // hardcoded for now

  1427.     c->gamma_value = 2.2;

  1428.     tmpFmt = AV_PIX_FMT_RGBA64LE;

  1429. 

  1430. 

  1431.     if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {

  1432.         SwsContext *c2;

  1433.         c->cascaded_context[0] = NULL;

  1434. 

  1435.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1436.                             srcW, srcH, tmpFmt, 64);

  1437.         if (ret < 0)

  1438.             return ret;

  1439. 

  1440.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1441.                                                 srcW, srcH, tmpFmt,

  1442.                                                 flags, NULL, NULL, c->param);

  1443.         if (!c->cascaded_context[0]) {

  1444.             return -1;

  1445.         }

  1446. 

  1447.         c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,

  1448.                                                 dstW, dstH, tmpFmt,

  1449.                                                 flags, srcFilter, dstFilter, c->param);

  1450. 

  1451.         if (!c->cascaded_context[1])

  1452.             return -1;

  1453. 

  1454.         c2 = c->cascaded_context[1];

  1455.         c2->is_internal_gamma = 1;

  1456.         c2->gamma     = alloc_gamma_tbl(    c->gamma_value);

  1457.         c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);

  1458.         if (!c2->gamma || !c2->inv_gamma)

  1459.             return AVERROR(ENOMEM);

  1460. 

  1461.         // is_internal_flag is set after creating the context

  1462.         // to properly create the gamma convert FilterDescriptor

  1463.         // we have to re-initialize it

  1464.         ff_free_filters(c2);

  1465.         if (ff_init_filters(c2) < 0) {

  1466.             sws_freeContext(c2);

  1467.             return -1;

  1468.         }

  1469. 

  1470.         c->cascaded_context[2] = NULL;

  1471.         if (dstFormat != tmpFmt) {

  1472.             ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,

  1473.                                 dstW, dstH, tmpFmt, 64);

  1474.             if (ret < 0)

  1475.                 return ret;

  1476. 

  1477.             c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,

  1478.                                                 dstW, dstH, dstFormat,

  1479.                                                 flags, NULL, NULL, c->param);

  1480.             if (!c->cascaded_context[2])

  1481.                 return -1;

  1482.         }

  1483.         return 0;

  1484.     }

  1485. 

  1486.     if (isBayer(srcFormat)) {

  1487.         if (!unscaled ||

  1488.             (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {

  1489.             enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;

  1490. 

  1491.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1492.                                 srcW, srcH, tmpFormat, 64);

  1493.             if (ret < 0)

  1494.                 return ret;

  1495. 

  1496.             c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1497.                                                     srcW, srcH, tmpFormat,

  1498.                                                     flags, srcFilter, NULL, c->param);

  1499.             if (!c->cascaded_context[0])

  1500.                 return -1;

  1501. 

  1502.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1503.                                                     dstW, dstH, dstFormat,

  1504.                                                     flags, NULL, dstFilter, c->param);

  1505.             if (!c->cascaded_context[1])

  1506.                 return -1;

  1507.             return 0;

  1508.         }

  1509.     }

  1510. 

  1511.     if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {

  1512.         enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);

  1513. 

  1514.         if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)

  1515.         if (!unscaled ||

  1516.             dstFormat != tmpFormat ||

  1517.             usesHFilter || usesVFilter ||

  1518.             c->srcRange != c->dstRange

  1519.         ) {

  1520.             c->cascaded_mainindex = 1;

  1521.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1522.                                 srcW, srcH, tmpFormat, 64);

  1523.             if (ret < 0)

  1524.                 return ret;

  1525. 

  1526.             c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1527.                                                         srcW, srcH, tmpFormat,

  1528.                                                         flags, c->param);

  1529.             if (!c->cascaded_context[0])

  1530.                 return -1;

  1531.             c->cascaded_context[0]->alphablend = c->alphablend;

  1532.             ret = sws_init_context(c->cascaded_context[0], NULL , NULL);

  1533.             if (ret < 0)

  1534.                 return ret;

  1535. 

  1536.             c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,

  1537.                                                         dstW, dstH, dstFormat,

  1538.                                                         flags, c->param);

  1539.             if (!c->cascaded_context[1])

  1540.                 return -1;

  1541. 

  1542.             c->cascaded_context[1]->srcRange = c->srcRange;

  1543.             c->cascaded_context[1]->dstRange = c->dstRange;

  1544.             ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);

  1545.             if (ret < 0)

  1546.                 return ret;

  1547. 

  1548.             return 0;

  1549.         }

  1550.     }

  1551. 

  1552. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1553. 

  1554.     /* precalculate horizontal scaler filter coefficients */

  1555.     {

  1556. #if HAVE_MMXEXT_INLINE

  1557. // can't downscale !!!

  1558.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1559.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1560.                                                              NULL, NULL, 8);

  1561.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1562.                                                              NULL, NULL, NULL, 4);

  1563. 

  1564. #if USE_MMAP

  1565.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1566.                                           PROT_READ | PROT_WRITE,

  1567.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1568.                                           -1, 0);

  1569.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1570.                                           PROT_READ | PROT_WRITE,

  1571.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1572.                                           -1, 0);

  1573. #elif HAVE_VIRTUALALLOC

  1574.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1575.                                                   c->lumMmxextFilterCodeSize,

  1576.                                                   MEM_COMMIT,

  1577.                                                   PAGE_EXECUTE_READWRITE);

  1578.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1579.                                                   c->chrMmxextFilterCodeSize,

  1580.                                                   MEM_COMMIT,

  1581.                                                   PAGE_EXECUTE_READWRITE);

  1582. #else

  1583.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1584.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1585. #endif

  1586. 

  1587. #ifdef MAP_ANONYMOUS

  1588.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1589. #else

  1590.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1591. #endif

  1592.             {

  1593.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1594.                 return AVERROR(ENOMEM);

  1595.             }

  1596. 

  1597.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1598.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1599.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1600.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1601. 

  1602.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1603.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1604.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1605.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1606. 

  1607. #if USE_MMAP

  1608.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1609.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1610.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1611.                 goto fail;

  1612.             }

  1613. #endif

  1614.         } else

  1615. #endif /* HAVE_MMXEXT_INLINE */

  1616.         {

  1617.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1618.                                     PPC_ALTIVEC(cpu_flags) ? 8 :

  1619.                                     have_neon(cpu_flags)   ? 4 : 1;

  1620. 

  1621.             if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1622.                            &c->hLumFilterSize, c->lumXInc,

  1623.                            srcW, dstW, filterAlign, 1 << 14,

  1624.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1625.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1626.                            c->param,

  1627.                            get_local_pos(c, 0, 0, 0),

  1628.                            get_local_pos(c, 0, 0, 0))) < 0)

  1629.                 goto fail;

  1630.             if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1631.                            &c->hChrFilterSize, c->chrXInc,

  1632.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1633.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1634.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1635.                            c->param,

  1636.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1637.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)

  1638.                 goto fail;

  1639.         }

  1640.     } // initialize horizontal stuff

  1641. 

  1642.     /* precalculate vertical scaler filter coefficients */

  1643.     {

  1644.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1645.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1646. 

  1647.         if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1648.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1649.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1650.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1651.                        c->param,

  1652.                        get_local_pos(c, 0, 0, 1),

  1653.                        get_local_pos(c, 0, 0, 1))) < 0)

  1654.             goto fail;

  1655.         if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1656.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1657.                        filterAlign, (1 << 12),

  1658.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1659.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1660.                        c->param,

  1661.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1662.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)

  1663. 

  1664.             goto fail;

  1665. 

  1666. #if HAVE_ALTIVEC

  1667.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1668.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1669. 

  1670.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1671.             int j;

  1672.             short *p = (short *)&c->vYCoeffsBank[i];

  1673.             for (j = 0; j < 8; j++)

  1674.                 p[j] = c->vLumFilter[i];

  1675.         }

  1676. 

  1677.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1678.             int j;

  1679.             short *p = (short *)&c->vCCoeffsBank[i];

  1680.             for (j = 0; j < 8; j++)

  1681.                 p[j] = c->vChrFilter[i];

  1682.         }

  1683. #endif

  1684.     }

  1685. 

  1686.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1687.     c->vLumBufSize = c->vLumFilterSize;

  1688.     c->vChrBufSize = c->vChrFilterSize;

  1689.     for (i = 0; i < dstH; i++) {

  1690.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1691.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1692.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1693.                                << c->chrSrcVSubSample));

  1694. 

  1695.         nextSlice >>= c->chrSrcVSubSample;

  1696.         nextSlice <<= c->chrSrcVSubSample;

  1697.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1698.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1699.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1700.             (nextSlice >> c->chrSrcVSubSample))

  1701.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1702.                              c->vChrFilterPos[chrI];

  1703.     }

  1704. 

  1705.     for (i = 0; i < 4; i++)

  1706.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1707. 

  1708.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1709.      * need to allocate several megabytes to handle all possible cases) */

  1710.     FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1711.     FF_ALLOCZ_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1712.     FF_ALLOCZ_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1713.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1714.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1715.     /* Note we need at least one pixel more at the end because of the MMX code

  1716.      * (just in case someone wants to replace the 4000/8000). */

  1717.     /* align at 16 bytes for AltiVec */

  1718.     for (i = 0; i < c->vLumBufSize; i++) {

  1719.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1720.                           dst_stride + 16, fail);

  1721.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1722.     }

  1723.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1724.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1725.     c->uv_offx2 = dst_stride + 16;

  1726.     for (i = 0; i < c->vChrBufSize; i++) {

  1727.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1728.                          dst_stride * 2 + 32, fail);

  1729.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1730.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1731.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1732.     }

  1733.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1734.         for (i = 0; i < c->vLumBufSize; i++) {

  1735.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1736.                               dst_stride + 16, fail);

  1737.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1738.         }

  1739. 

  1740.     // try to avoid drawing green stuff between the right end and the stride end

  1741.     for (i = 0; i < c->vChrBufSize; i++)

  1742.         if(desc_dst->comp[0].depth == 16){

  1743.             av_assert0(c->dstBpc > 14);

  1744.             for(j=0; j<dst_stride/2+1; j++)

  1745.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1746.         } else

  1747.             for(j=0; j<dst_stride+1; j++)

  1748.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1749. 

  1750.     av_assert0(c->chrDstH <= dstH);

  1751. 

  1752.     if (flags & SWS_PRINT_INFO) {

  1753.         const char *scaler = NULL, *cpucaps;

  1754. 

  1755.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1756.             if (flags & scale_algorithms[i].flag) {

  1757.                 scaler = scale_algorithms[i].description;

  1758.                 break;

  1759.             }

  1760.         }

  1761.         if (!scaler)

  1762.             scaler =  "ehh flags invalid?!";

  1763.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1764.                scaler,

  1765.                av_get_pix_fmt_name(srcFormat),

  1766. #ifdef DITHER1XBPP

  1767.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1768.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1769.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1770.                                                              "dithered " : "",

  1771. #else

  1772.                "",

  1773. #endif

  1774.                av_get_pix_fmt_name(dstFormat));

  1775. 

  1776.         if (INLINE_MMXEXT(cpu_flags))

  1777.             cpucaps = "MMXEXT";

  1778.         else if (INLINE_AMD3DNOW(cpu_flags))

  1779.             cpucaps = "3DNOW";

  1780.         else if (INLINE_MMX(cpu_flags))

  1781.             cpucaps = "MMX";

  1782.         else if (PPC_ALTIVEC(cpu_flags))

  1783.             cpucaps = "AltiVec";

  1784.         else

  1785.             cpucaps = "C";

  1786. 

  1787.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1788. 

  1789.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1790.         av_log(c, AV_LOG_DEBUG,

  1791.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1792.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1793.         av_log(c, AV_LOG_DEBUG,

  1794.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1795.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1796.                c->chrXInc, c->chrYInc);

  1797.     }

  1798. 

  1799.     /* alpha blend special case, note this has been split via cascaded contexts if its scaled */

  1800.     if (unscaled && !usesHFilter && !usesVFilter &&

  1801.         c->alphablend != SWS_ALPHA_BLEND_NONE &&

  1802.         isALPHA(srcFormat) &&

  1803.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&

  1804.         alphaless_fmt(srcFormat) == dstFormat

  1805.     ) {

  1806.         c->swscale = ff_sws_alphablendaway;

  1807. 

  1808.         if (flags & SWS_PRINT_INFO)

  1809.             av_log(c, AV_LOG_INFO,

  1810.                     "using alpha blendaway %s -> %s special converter\n",

  1811.                     av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1812.         return 0;

  1813.     }

  1814. 

  1815.     /* unscaled special cases */

  1816.     if (unscaled && !usesHFilter && !usesVFilter &&

  1817.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1818.         ff_get_unscaled_swscale(c);

  1819. 

  1820.         if (c->swscale) {

  1821.             if (flags & SWS_PRINT_INFO)

  1822.                 av_log(c, AV_LOG_INFO,

  1823.                        "using unscaled %s -> %s special converter\n",

  1824.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1825.             return 0;

  1826.         }

  1827.     }

  1828. 

  1829.     c->swscale = ff_getSwsFunc(c);

  1830.     return ff_init_filters(c);

  1831. fail: // FIXME replace things by appropriate error codes

  1832.     if (ret == RETCODE_USE_CASCADE)  {

  1833.         int tmpW = sqrt(srcW * (int64_t)dstW);

  1834.         int tmpH = sqrt(srcH * (int64_t)dstH);

  1835.         enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;

  1836. 

  1837.         if (isALPHA(srcFormat))

  1838.             tmpFormat = AV_PIX_FMT_YUVA420P;

  1839. 

  1840.         if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)

  1841.             return AVERROR(EINVAL);

  1842. 

  1843.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1844.                              tmpW, tmpH, tmpFormat, 64);

  1845.         if (ret < 0)

  1846.             return ret;

  1847. 

  1848.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1849.                                                 tmpW, tmpH, tmpFormat,

  1850.                                                 flags, srcFilter, NULL, c->param);

  1851.         if (!c->cascaded_context[0])

  1852.             return -1;

  1853. 

  1854.         c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,

  1855.                                                 dstW, dstH, dstFormat,

  1856.                                                 flags, NULL, dstFilter, c->param);

  1857.         if (!c->cascaded_context[1])

  1858.             return -1;

  1859.         return 0;

  1860.     }

  1861.     return -1;

  1862. }

  1863. 

  1864. SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1865.                                int dstW, int dstH, enum AVPixelFormat dstFormat,

  1866.                                int flags, const double *param)

  1867. {

  1868.     SwsContext *c;

  1869. 

  1870.     if (!(c = sws_alloc_context()))

  1871.         return NULL;

  1872. 

  1873.     c->flags     = flags;

  1874.     c->srcW      = srcW;

  1875.     c->srcH      = srcH;

  1876.     c->dstW      = dstW;

  1877.     c->dstH      = dstH;

  1878.     c->srcFormat = srcFormat;

  1879.     c->dstFormat = dstFormat;

  1880. 

  1881.     if (param) {

  1882.         c->param[0] = param[0];

  1883.         c->param[1] = param[1];

  1884.     }

  1885. 

  1886.     return c;

  1887. }

  1888. 

  1889. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1890.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1891.                            int flags, SwsFilter *srcFilter,

  1892.                            SwsFilter *dstFilter, const double *param)

  1893. {

  1894.     SwsContext *c;

  1895. 

  1896.     c = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1897.                            dstW, dstH, dstFormat,

  1898.                            flags, param);

  1899.     if (!c)

  1900.         return NULL;

  1901. 

  1902.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1903.         sws_freeContext(c);

  1904.         return NULL;

  1905.     }

  1906. 

  1907.     return c;

  1908. }

  1909. 

  1910. static int isnan_vec(SwsVector *a)

  1911. {

  1912.     int i;

  1913.     for (i=0; i<a->length; i++)

  1914.         if (isnan(a->coeff[i]))

  1915.             return 1;

  1916.     return 0;

  1917. }

  1918. 

  1919. static void makenan_vec(SwsVector *a)

  1920. {

  1921.     int i;

  1922.     for (i=0; i<a->length; i++)

  1923.         a->coeff[i] = NAN;

  1924. }

  1925. 

  1926. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1927.                                 float lumaSharpen, float chromaSharpen,

  1928.                                 float chromaHShift, float chromaVShift,

  1929.                                 int verbose)

  1930. {

  1931.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1932.     if (!filter)

  1933.         return NULL;

  1934. 

  1935.     if (lumaGBlur != 0.0) {

  1936.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1937.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1938.     } else {

  1939.         filter->lumH = sws_getIdentityVec();

  1940.         filter->lumV = sws_getIdentityVec();

  1941.     }

  1942. 

  1943.     if (chromaGBlur != 0.0) {

  1944.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1945.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1946.     } else {

  1947.         filter->chrH = sws_getIdentityVec();

  1948.         filter->chrV = sws_getIdentityVec();

  1949.     }

  1950. 

  1951.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1952.         goto fail;

  1953. 

  1954.     if (chromaSharpen != 0.0) {

  1955.         SwsVector *id = sws_getIdentityVec();

  1956.         if (!id)

  1957.             goto fail;

  1958.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1959.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1960.         sws_addVec(filter->chrH, id);

  1961.         sws_addVec(filter->chrV, id);

  1962.         sws_freeVec(id);

  1963.     }

  1964. 

  1965.     if (lumaSharpen != 0.0) {

  1966.         SwsVector *id = sws_getIdentityVec();

  1967.         if (!id)

  1968.             goto fail;

  1969.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1970.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1971.         sws_addVec(filter->lumH, id);

  1972.         sws_addVec(filter->lumV, id);

  1973.         sws_freeVec(id);

  1974.     }

  1975. 

  1976.     if (chromaHShift != 0.0)

  1977.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1978. 

  1979.     if (chromaVShift != 0.0)

  1980.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1981. 

  1982.     sws_normalizeVec(filter->chrH, 1.0);

  1983.     sws_normalizeVec(filter->chrV, 1.0);

  1984.     sws_normalizeVec(filter->lumH, 1.0);

  1985.     sws_normalizeVec(filter->lumV, 1.0);

  1986. 

  1987.     if (isnan_vec(filter->chrH) ||

  1988.         isnan_vec(filter->chrV) ||

  1989.         isnan_vec(filter->lumH) ||

  1990.         isnan_vec(filter->lumV))

  1991.         goto fail;

  1992. 

  1993.     if (verbose)

  1994.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1995.     if (verbose)

  1996.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1997. 

  1998.     return filter;

  1999. 

  2000. fail:

  2001.     sws_freeVec(filter->lumH);

  2002.     sws_freeVec(filter->lumV);

  2003.     sws_freeVec(filter->chrH);

  2004.     sws_freeVec(filter->chrV);

  2005.     av_freep(&filter);

  2006.     return NULL;

  2007. }

  2008. 

  2009. SwsVector *sws_allocVec(int length)

  2010. {

  2011.     SwsVector *vec;

  2012. 

  2013.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  2014.         return NULL;

  2015. 

  2016.     vec = av_malloc(sizeof(SwsVector));

  2017.     if (!vec)

  2018.         return NULL;

  2019.     vec->length = length;

  2020.     vec->coeff  = av_malloc(sizeof(double) * length);

  2021.     if (!vec->coeff)

  2022.         av_freep(&vec);

  2023.     return vec;

  2024. }

  2025. 

  2026. SwsVector *sws_getGaussianVec(double variance, double quality)

  2027. {

  2028.     const int length = (int)(variance * quality + 0.5) | 1;

  2029.     int i;

  2030.     double middle  = (length - 1) * 0.5;

  2031.     SwsVector *vec;

  2032. 

  2033.     if(variance < 0 || quality < 0)

  2034.         return NULL;

  2035. 

  2036.     vec = sws_allocVec(length);

  2037. 

  2038.     if (!vec)

  2039.         return NULL;

  2040. 

  2041.     for (i = 0; i < length; i++) {

  2042.         double dist = i - middle;

  2043.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  2044.                         sqrt(2 * variance * M_PI);

  2045.     }

  2046. 

  2047.     sws_normalizeVec(vec, 1.0);

  2048. 

  2049.     return vec;

  2050. }

  2051. 

  2052. SwsVector *sws_getConstVec(double c, int length)

  2053. {

  2054.     int i;

  2055.     SwsVector *vec = sws_allocVec(length);

  2056. 

  2057.     if (!vec)

  2058.         return NULL;

  2059. 

  2060.     for (i = 0; i < length; i++)

  2061.         vec->coeff[i] = c;

  2062. 

  2063.     return vec;

  2064. }

  2065. 

  2066. SwsVector *sws_getIdentityVec(void)

  2067. {

  2068.     return sws_getConstVec(1.0, 1);

  2069. }

  2070. 

  2071. static double sws_dcVec(SwsVector *a)

  2072. {

  2073.     int i;

  2074.     double sum = 0;

  2075. 

  2076.     for (i = 0; i < a->length; i++)

  2077.         sum += a->coeff[i];

  2078. 

  2079.     return sum;

  2080. }

  2081. 

  2082. void sws_scaleVec(SwsVector *a, double scalar)

  2083. {

  2084.     int i;

  2085. 

  2086.     for (i = 0; i < a->length; i++)

  2087.         a->coeff[i] *= scalar;

  2088. }

  2089. 

  2090. void sws_normalizeVec(SwsVector *a, double height)

  2091. {

  2092.     sws_scaleVec(a, height / sws_dcVec(a));

  2093. }

  2094. 

  2095. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  2096. {

  2097.     int length = a->length + b->length - 1;

  2098.     int i, j;

  2099.     SwsVector *vec = sws_getConstVec(0.0, length);

  2100. 

  2101.     if (!vec)

  2102.         return NULL;

  2103. 

  2104.     for (i = 0; i < a->length; i++) {

  2105.         for (j = 0; j < b->length; j++) {

  2106.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  2107.         }

  2108.     }

  2109. 

  2110.     return vec;

  2111. }

  2112. 

  2113. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  2114. {

  2115.     int length = FFMAX(a->length, b->length);

  2116.     int i;

  2117.     SwsVector *vec = sws_getConstVec(0.0, length);

  2118. 

  2119.     if (!vec)

  2120.         return NULL;

  2121. 

  2122.     for (i = 0; i < a->length; i++)

  2123.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2124.     for (i = 0; i < b->length; i++)

  2125.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  2126. 

  2127.     return vec;

  2128. }

  2129. 

  2130. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  2131. {

  2132.     int length = FFMAX(a->length, b->length);

  2133.     int i;

  2134.     SwsVector *vec = sws_getConstVec(0.0, length);

  2135. 

  2136.     if (!vec)

  2137.         return NULL;

  2138. 

  2139.     for (i = 0; i < a->length; i++)

  2140.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2141.     for (i = 0; i < b->length; i++)

  2142.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  2143. 

  2144.     return vec;

  2145. }

  2146. 

  2147. /* shift left / or right if "shift" is negative */

  2148. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  2149. {

  2150.     int length = a->length + FFABS(shift) * 2;

  2151.     int i;

  2152.     SwsVector *vec = sws_getConstVec(0.0, length);

  2153. 

  2154.     if (!vec)

  2155.         return NULL;

  2156. 

  2157.     for (i = 0; i < a->length; i++) {

  2158.         vec->coeff[i + (length    - 1) / 2 -

  2159.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  2160.     }

  2161. 

  2162.     return vec;

  2163. }

  2164. 

  2165. void sws_shiftVec(SwsVector *a, int shift)

  2166. {

  2167.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  2168.     if (!shifted) {

  2169.         makenan_vec(a);

  2170.         return;

  2171.     }

  2172.     av_free(a->coeff);

  2173.     a->coeff  = shifted->coeff;

  2174.     a->length = shifted->length;

  2175.     av_free(shifted);

  2176. }

  2177. 

  2178. void sws_addVec(SwsVector *a, SwsVector *b)

  2179. {

  2180.     SwsVector *sum = sws_sumVec(a, b);

  2181.     if (!sum) {

  2182.         makenan_vec(a);

  2183.         return;

  2184.     }

  2185.     av_free(a->coeff);

  2186.     a->coeff  = sum->coeff;

  2187.     a->length = sum->length;

  2188.     av_free(sum);

  2189. }

  2190. 

  2191. void sws_subVec(SwsVector *a, SwsVector *b)

  2192. {

  2193.     SwsVector *diff = sws_diffVec(a, b);

  2194.     if (!diff) {

  2195.         makenan_vec(a);

  2196.         return;

  2197.     }

  2198.     av_free(a->coeff);

  2199.     a->coeff  = diff->coeff;

  2200.     a->length = diff->length;

  2201.     av_free(diff);

  2202. }

  2203. 

  2204. void sws_convVec(SwsVector *a, SwsVector *b)

  2205. {

  2206.     SwsVector *conv = sws_getConvVec(a, b);

  2207.     if (!conv) {

  2208.         makenan_vec(a);

  2209.         return;

  2210.     }

  2211.     av_free(a->coeff);

  2212.     a->coeff  = conv->coeff;

  2213.     a->length = conv->length;

  2214.     av_free(conv);

  2215. }

  2216. 

  2217. SwsVector *sws_cloneVec(SwsVector *a)

  2218. {

  2219.     SwsVector *vec = sws_allocVec(a->length);

  2220. 

  2221.     if (!vec)

  2222.         return NULL;

  2223. 

  2224.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  2225. 

  2226.     return vec;

  2227. }

  2228. 

  2229. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  2230. {

  2231.     int i;

  2232.     double max = 0;

  2233.     double min = 0;

  2234.     double range;

  2235. 

  2236.     for (i = 0; i < a->length; i++)

  2237.         if (a->coeff[i] > max)

  2238.             max = a->coeff[i];

  2239. 

  2240.     for (i = 0; i < a->length; i++)

  2241.         if (a->coeff[i] < min)

  2242.             min = a->coeff[i];

  2243. 

  2244.     range = max - min;

  2245. 

  2246.     for (i = 0; i < a->length; i++) {

  2247.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  2248.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  2249.         for (; x > 0; x--)

  2250.             av_log(log_ctx, log_level, " ");

  2251.         av_log(log_ctx, log_level, "|\n");

  2252.     }

  2253. }

  2254. 

  2255. void sws_freeVec(SwsVector *a)

  2256. {

  2257.     if (!a)

  2258.         return;

  2259.     av_freep(&a->coeff);

  2260.     a->length = 0;

  2261.     av_free(a);

  2262. }

  2263. 

  2264. void sws_freeFilter(SwsFilter *filter)

  2265. {

  2266.     if (!filter)

  2267.         return;

  2268. 

  2269.     sws_freeVec(filter->lumH);

  2270.     sws_freeVec(filter->lumV);

  2271.     sws_freeVec(filter->chrH);

  2272.     sws_freeVec(filter->chrV);

  2273.     av_free(filter);

  2274. }

  2275. 

  2276. void sws_freeContext(SwsContext *c)

  2277. {

  2278.     int i;

  2279.     if (!c)

  2280.         return;

  2281. 

  2282.     if (c->lumPixBuf) {

  2283.         for (i = 0; i < c->vLumBufSize; i++)

  2284.             av_freep(&c->lumPixBuf[i]);

  2285.         av_freep(&c->lumPixBuf);

  2286.     }

  2287. 

  2288.     if (c->chrUPixBuf) {

  2289.         for (i = 0; i < c->vChrBufSize; i++)

  2290.             av_freep(&c->chrUPixBuf[i]);

  2291.         av_freep(&c->chrUPixBuf);

  2292.         av_freep(&c->chrVPixBuf);

  2293.     }

  2294. 

  2295.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2296.         for (i = 0; i < c->vLumBufSize; i++)

  2297.             av_freep(&c->alpPixBuf[i]);

  2298.         av_freep(&c->alpPixBuf);

  2299.     }

  2300. 

  2301.     for (i = 0; i < 4; i++)

  2302.         av_freep(&c->dither_error[i]);

  2303. 

  2304.     av_freep(&c->vLumFilter);

  2305.     av_freep(&c->vChrFilter);

  2306.     av_freep(&c->hLumFilter);

  2307.     av_freep(&c->hChrFilter);

  2308. #if HAVE_ALTIVEC

  2309.     av_freep(&c->vYCoeffsBank);

  2310.     av_freep(&c->vCCoeffsBank);

  2311. #endif

  2312. 

  2313.     av_freep(&c->vLumFilterPos);

  2314.     av_freep(&c->vChrFilterPos);

  2315.     av_freep(&c->hLumFilterPos);

  2316.     av_freep(&c->hChrFilterPos);

  2317. 

  2318. #if HAVE_MMX_INLINE

  2319. #if USE_MMAP

  2320.     if (c->lumMmxextFilterCode)

  2321.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2322.     if (c->chrMmxextFilterCode)

  2323.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2324. #elif HAVE_VIRTUALALLOC

  2325.     if (c->lumMmxextFilterCode)

  2326.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2327.     if (c->chrMmxextFilterCode)

  2328.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2329. #else

  2330.     av_free(c->lumMmxextFilterCode);

  2331.     av_free(c->chrMmxextFilterCode);

  2332. #endif

  2333.     c->lumMmxextFilterCode = NULL;

  2334.     c->chrMmxextFilterCode = NULL;

  2335. #endif /* HAVE_MMX_INLINE */

  2336. 

  2337.     av_freep(&c->yuvTable);

  2338.     av_freep(&c->formatConvBuffer);

  2339. 

  2340.     sws_freeContext(c->cascaded_context[0]);

  2341.     sws_freeContext(c->cascaded_context[1]);

  2342.     sws_freeContext(c->cascaded_context[2]);

  2343.     memset(c->cascaded_context, 0, sizeof(c->cascaded_context));

  2344.     av_freep(&c->cascaded_tmp[0]);

  2345.     av_freep(&c->cascaded1_tmp[0]);

  2346. 

  2347.     av_freep(&c->gamma);

  2348.     av_freep(&c->inv_gamma);

  2349. 

  2350.     ff_free_filters(c);

  2351. 

  2352.     av_free(c);

  2353. }

  2354. 

  2355. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2356.                                         int srcH, enum AVPixelFormat srcFormat,

  2357.                                         int dstW, int dstH,

  2358.                                         enum AVPixelFormat dstFormat, int flags,

  2359.                                         SwsFilter *srcFilter,

  2360.                                         SwsFilter *dstFilter,

  2361.                                         const double *param)

  2362. {

  2363.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2364.                                              SWS_PARAM_DEFAULT };

  2365.     int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,

  2366.             src_v_chr_pos = -513, dst_v_chr_pos = -513;

  2367. 

  2368.     if (!param)

  2369.         param = default_param;

  2370. 

  2371.     if (context &&

  2372.         (context->srcW      != srcW      ||

  2373.          context->srcH      != srcH      ||

  2374.          context->srcFormat != srcFormat ||

  2375.          context->dstW      != dstW      ||

  2376.          context->dstH      != dstH      ||

  2377.          context->dstFormat != dstFormat ||

  2378.          context->flags     != flags     ||

  2379.          context->param[0]  != param[0]  ||

  2380.          context->param[1]  != param[1])) {

  2381. 

  2382.         av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);

  2383.         av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);

  2384.         av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);

  2385.         av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);

  2386.         sws_freeContext(context);

  2387.         context = NULL;

  2388.     }

  2389. 

  2390.     if (!context) {

  2391.         if (!(context = sws_alloc_context()))

  2392.             return NULL;

  2393.         context->srcW      = srcW;

  2394.         context->srcH      = srcH;

  2395.         context->srcFormat = srcFormat;

  2396.         context->dstW      = dstW;

  2397.         context->dstH      = dstH;

  2398.         context->dstFormat = dstFormat;

  2399.         context->flags     = flags;

  2400.         context->param[0]  = param[0];

  2401.         context->param[1]  = param[1];

  2402. 

  2403.         av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);

  2404.         av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);

  2405.         av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);

  2406.         av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);

  2407. 

  2408.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2409.             sws_freeContext(context);

  2410.             return NULL;

  2411.         }

  2412.     }

  2413.     return context;

  2414. }