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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/ppc/cpu.h"

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

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

  55. #include "rgb2rgb.h"

  56. #include "swscale.h"

  57. #include "swscale_internal.h"

  58. 

  59. static void handle_formats(SwsContext *c);

  60. 

  61. unsigned swscale_version(void)

  62. {

  63.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  64.     return LIBSWSCALE_VERSION_INT;

  65. }

  66. 

  67. const char *swscale_configuration(void)

  68. {

  69.     return FFMPEG_CONFIGURATION;

  70. }

  71. 

  72. const char *swscale_license(void)

  73. {

  74. #define LICENSE_PREFIX "libswscale license: "

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

  76. }

  77. 

  78. typedef struct FormatEntry {

  79.     uint8_t is_supported_in         :1;

  80.     uint8_t is_supported_out        :1;

  81.     uint8_t is_supported_endianness :1;

  82. } FormatEntry;

  83. 

  84. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  235. };

  236. 

  237. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  238. {

  239.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  240.            format_entries[pix_fmt].is_supported_in : 0;

  241. }

  242. 

  243. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  244. {

  245.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  246.            format_entries[pix_fmt].is_supported_out : 0;

  247. }

  248. 

  249. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  250. {

  251.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  252.            format_entries[pix_fmt].is_supported_endianness : 0;

  253. }

  254. 

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

  256.                              double dist)

  257. {

  258.     if (dist <= 1.0)

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

  260.     else

  261.         return getSplineCoeff(0.0,

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

  263.                                c + 3.0 * d,

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

  265.                               dist - 1.0);

  266. }

  267. 

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

  269. {

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

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

  272.     }

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

  274.     return pos >> chr_subsample;

  275. }

  276. 

  277. typedef struct {

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

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

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

  281. } ScaleAlgorithm;

  282. 

  283. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  295. };

  296. 

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

  298.                               int *outFilterSize, int xInc, int srcW,

  299.                               int dstW, int filterAlign, int one,

  300.                               int flags, int cpu_flags,

  301.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  303. {

  304.     int i;

  305.     int filterSize;

  306.     int filter2Size;

  307.     int minFilterSize;

  308.     int64_t *filter    = NULL;

  309.     int64_t *filter2   = NULL;

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

  311.     int ret            = -1;

  312. 

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

  314. 

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

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

  317. 

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

  319.         int i;

  320.         filterSize = 1;

  321.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  323. 

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

  325.             filter[i * filterSize] = fone;

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

  327.         }

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

  329.         int i;

  330.         int64_t xDstInSrc;

  331.         filterSize = 1;

  332.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  334. 

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

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

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

  338. 

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

  340.             filter[i]       = fone;

  341.             xDstInSrc      += xInc;

  342.         }

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

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

  345.         int i;

  346.         int64_t xDstInSrc;

  347.         filterSize = 2;

  348.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  350. 

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

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

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

  354.             int j;

  355. 

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

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

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

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

  360.                 if (coeff < 0)

  361.                     coeff = 0;

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

  363.                 xx++;

  364.             }

  365.             xDstInSrc += xInc;

  366.         }

  367.     } else {

  368.         int64_t xDstInSrc;

  369.         int sizeFactor = -1;

  370. 

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

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

  373.                 sizeFactor = scale_algorithms[i].size_factor;

  374.                 break;

  375.             }

  376.         }

  377.         if (flags & SWS_LANCZOS)

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

  379.         av_assert0(sizeFactor > 0);

  380. 

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

  382.             filterSize = 1 + sizeFactor;    // upscale

  383.         else

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

  385. 

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

  387.         filterSize = FFMAX(filterSize, 1);

  388. 

  389.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  391. 

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

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

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

  395.             int j;

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

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

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

  399.                 double floatd;

  400.                 int64_t coeff;

  401. 

  402.                 if (xInc > 1 << 16)

  403.                     d = d * dstW / srcW;

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

  405. 

  406.                 if (flags & SWS_BICUBIC) {

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

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

  409. 

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

  411.                         coeff = 0.0;

  412.                     } else {

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

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

  415. 

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

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

  418.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  419.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  420.                         else

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

  422.                                       (6 * B + 30 * C) * dd  +

  423.                                     (-12 * B - 48 * C) * d   +

  424.                                       (8 * B + 24 * C) * (1 << 30);

  425.                     }

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

  427.                 }

  428. #if 0

  429.                 else if (flags & SWS_X) {

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

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

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

  433.                 }

  434. #endif

  435.                 else if (flags & SWS_X) {

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

  437.                     double c;

  438. 

  439.                     if (floatd < 1.0)

  440.                         c = cos(floatd * M_PI);

  441.                     else

  442.                         c = -1.0;

  443.                     if (c < 0.0)

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

  445.                     else

  446.                         c = pow(c, A);

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

  448.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  454.                     else

  455.                         coeff = 0.0;

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

  457.                 } else if (flags & SWS_GAUSS) {

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

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

  460.                 } else if (flags & SWS_SINC) {

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

  462.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  466.                     if (floatd > p)

  467.                         coeff = 0;

  468.                 } else if (flags & SWS_BILINEAR) {

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

  470.                     if (coeff < 0)

  471.                         coeff = 0;

  472.                     coeff *= fone >> 30;

  473.                 } else if (flags & SWS_SPLINE) {

  474.                     double p = -2.196152422706632;

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

  476.                 } else {

  477.                     av_assert0(0);

  478.                 }

  479. 

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

  481.                 xx++;

  482.             }

  483.             xDstInSrc += 2 * xInc;

  484.         }

  485.     }

  486. 

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

  488.      * av_free(filter);

  489.      */

  490.     av_assert0(filterSize > 0);

  491.     filter2Size = filterSize;

  492.     if (srcFilter)

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

  494.     if (dstFilter)

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

  496.     av_assert0(filter2Size > 0);

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

  498. 

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

  500.         int j, k;

  501. 

  502.         if (srcFilter) {

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

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

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

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

  507.             }

  508.         } else {

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

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

  511.         }

  512.         // FIXME dstFilter

  513. 

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

  515.     }

  516.     av_freep(&filter);

  517. 

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

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

  520.     minFilterSize = 0;

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

  522.         int min = filter2Size;

  523.         int j;

  524.         int64_t cutOff = 0.0;

  525. 

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

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

  528.             int k;

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

  530. 

  531.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  532.                 break;

  533. 

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

  535.              * filter otherwise */

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

  537.                 break;

  538. 

  539.             // move filter coefficients left

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

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

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

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

  544.         }

  545. 

  546.         cutOff = 0;

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

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

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

  550. 

  551.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  552.                 break;

  553.             min--;

  554.         }

  555. 

  556.         if (min > minFilterSize)

  557.             minFilterSize = min;

  558.     }

  559. 

  560.     if (PPC_ALTIVEC(cpu_flags)) {

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

  562.         if (minFilterSize < 5)

  563.             filterAlign = 4;

  564. 

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

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

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

  568.         if (minFilterSize < 3)

  569.             filterAlign = 1;

  570.     }

  571. 

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

  573.         // special case for unscaled vertical filtering

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

  575.             filterAlign = 1;

  576.     }

  577. 

  578.     av_assert0(minFilterSize > 0);

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

  580.     av_assert0(filterSize > 0);

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

  582.     if (!filter)

  583.         goto fail;

  584.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  586.         ret = RETCODE_USE_CASCADE;

  587.         goto fail;

  588.     }

  589.     *outFilterSize = filterSize;

  590. 

  591.     if (flags & SWS_PRINT_INFO)

  592.         av_log(NULL, AV_LOG_VERBOSE,

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

  594.                filter2Size, filterSize);

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

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

  597.         int j;

  598. 

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

  600.             if (j >= filter2Size)

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

  602.             else

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

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

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

  606.         }

  607.     }

  608. 

  609.     // FIXME try to align filterPos if possible

  610. 

  611.     // fix borders

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

  613.         int j;

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

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

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

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

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

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

  620.             }

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

  622.         }

  623. 

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

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

  626.             int64_t acc = 0;

  627. 

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

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

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

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

  632.                 }

  633.             }

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

  635.                 if (j < shift) {

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

  637.                 } else {

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

  639.                 }

  640.             }

  641. 

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

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

  644.         }

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

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

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

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

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

  650.             }

  651.         }

  652.     }

  653. 

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

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

  656.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  658. 

  659.     /* normalize & store in outFilter */

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

  661.         int j;

  662.         int64_t error = 0;

  663.         int64_t sum   = 0;

  664. 

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

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

  667.         }

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

  669.         if (!sum) {

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

  671.             sum = 1;

  672.         }

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

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

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

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

  677.             error                                  = v - intV * sum;

  678.         }

  679.     }

  680. 

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

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

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

  684.                                                       * read over the end */

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

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

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

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

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

  690.     }

  691. 

  692.     ret = 0;

  693. 

  694. fail:

  695.     if(ret < 0)

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

  697.     av_free(filter);

  698.     av_free(filter2);

  699.     return ret;

  700. }

  701. 

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

  703. {

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

  705.     int64_t vr =  table[0];

  706.     int64_t ub =  table[1];

  707.     int64_t ug = -table[2];

  708.     int64_t vg = -table[3];

  709.     int64_t ONE = 65536;

  710.     int64_t cy = ONE;

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

  712.     int i;

  713.     static const int8_t map[] = {

  714.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  715.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

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

  717.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  718.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  719.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

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

  721.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  722.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  723.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

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

  725.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  726.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

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

  728.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

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

  730.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

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

  732.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

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

  734.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

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

  736.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  737.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  738.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  739.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  740.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  741.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  742.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  743.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  744.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  745.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  749.     };

  750. 

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

  752. 

  753.     if (!dstRange) {

  754.         cy = cy * 255 / 219;

  755.     } else {

  756.         vr = vr * 224 / 255;

  757.         ub = ub * 224 / 255;

  758.         ug = ug * 224 / 255;

  759.         vg = vg * 224 / 255;

  760.     }

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

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

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

  764. 

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

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

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

  768. 

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

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

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

  772. 

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

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

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

  776. 

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

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

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

  780. 

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

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

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

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

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

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

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

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

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

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

  791.     }

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

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

  794. }

  795. 

  796. static void fill_xyztables(struct SwsContext *c)

  797. {

  798.     int i;

  799.     double xyzgamma = XYZ_GAMMA;

  800.     double rgbgamma = 1.0 / RGB_GAMMA;

  801.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  802.     double rgbgammainv = RGB_GAMMA;

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

  804.         {13270, -6295, -2041},

  805.         {-3969,  7682,   170},

  806.         {  228,  -835,  4329} };

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

  808.         {1689, 1464,  739},

  809.         { 871, 2929,  296},

  810.         {  79,  488, 3891} };

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

  812. 

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

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

  815.     c->xyzgamma = xyzgamma_tab;

  816.     c->rgbgamma = rgbgamma_tab;

  817.     c->xyzgammainv = xyzgammainv_tab;

  818.     c->rgbgammainv = rgbgammainv_tab;

  819. 

  820.     if (rgbgamma_tab[4095])

  821.         return;

  822. 

  823.     /* set gamma vectors */

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

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

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

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

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

  829.     }

  830. }

  831. 

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

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

  834.                              int brightness, int contrast, int saturation)

  835. {

  836.     const AVPixFmtDescriptor *desc_dst;

  837.     const AVPixFmtDescriptor *desc_src;

  838.     int need_reinit = 0;

  839. 

  840.     handle_formats(c);

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

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

  843. 

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

  845.         dstRange = 0;

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

  847.         srcRange = 0;

  848. 

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

  850.         c->dstRange != dstRange ||

  851.         c->brightness != brightness ||

  852.         c->contrast   != contrast ||

  853.         c->saturation != saturation ||

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

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

  856.     )

  857.         need_reinit = 1;

  858. 

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

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

  861. 

  862. 

  863. 

  864.     c->brightness = brightness;

  865.     c->contrast   = contrast;

  866.     c->saturation = saturation;

  867.     c->srcRange   = srcRange;

  868.     c->dstRange   = dstRange;

  869. 

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

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

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

  873.         ff_sws_init_range_convert(c);

  874. 

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

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

  877. 

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

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

  880. 

  881.     if (!need_reinit)

  882.         return 0;

  883. 

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

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

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

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

  888.             enum AVPixelFormat tmp_format;

  889.             int tmp_width, tmp_height;

  890.             int srcW = c->srcW;

  891.             int srcH = c->srcH;

  892.             int dstW = c->dstW;

  893.             int dstH = c->dstH;

  894.             int ret;

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

  896. 

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

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

  899.                     tmp_format = AV_PIX_FMT_BGRA64;

  900.                 } else {

  901.                     tmp_format = AV_PIX_FMT_BGR48;

  902.                 }

  903.             } else {

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

  905.                     tmp_format = AV_PIX_FMT_BGRA;

  906.                 } else {

  907.                     tmp_format = AV_PIX_FMT_BGR24;

  908.                 }

  909.             }

  910. 

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

  912.                 tmp_width  = dstW;

  913.                 tmp_height = dstH;

  914.             } else {

  915.                 tmp_width  = srcW;

  916.                 tmp_height = srcH;

  917.             }

  918. 

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

  920.                                 tmp_width, tmp_height, tmp_format, 64);

  921.             if (ret < 0)

  922.                 return ret;

  923. 

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

  925.                                                         tmp_width, tmp_height, tmp_format,

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

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

  928.                 return -1;

  929. 

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

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

  932.             if (ret < 0)

  933.                 return ret;

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

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

  936.                                      srcRange, table, dstRange,

  937.                                      brightness, contrast, saturation);

  938. 

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

  940.                                                     dstW, dstH, c->dstFormat,

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

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

  943.                 return -1;

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

  945.                                      srcRange, table, dstRange,

  946.                                      0, 1 << 16, 1 << 16);

  947.             return 0;

  948.         }

  949.         return -1;

  950.     }

  951. 

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

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

  954.                                  contrast, saturation);

  955.         // FIXME factorize

  956. 

  957.         if (ARCH_PPC)

  958.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  959.                                        contrast, saturation);

  960.     }

  961. 

  962.     fill_rgb2yuv_table(c, table, dstRange);

  963. 

  964.     return 0;

  965. }

  966. 

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

  968.                              int *srcRange, int **table, int *dstRange,

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

  970. {

  971.     if (!c )

  972.         return -1;

  973. 

  974.     *inv_table  = c->srcColorspaceTable;

  975.     *table      = c->dstColorspaceTable;

  976.     *srcRange   = c->srcRange;

  977.     *dstRange   = c->dstRange;

  978.     *brightness = c->brightness;

  979.     *contrast   = c->contrast;

  980.     *saturation = c->saturation;

  981. 

  982.     return 0;

  983. }

  984. 

  985. static int handle_jpeg(enum AVPixelFormat *format)

  986. {

  987.     switch (*format) {

  988.     case AV_PIX_FMT_YUVJ420P:

  989.         *format = AV_PIX_FMT_YUV420P;

  990.         return 1;

  991.     case AV_PIX_FMT_YUVJ411P:

  992.         *format = AV_PIX_FMT_YUV411P;

  993.         return 1;

  994.     case AV_PIX_FMT_YUVJ422P:

  995.         *format = AV_PIX_FMT_YUV422P;

  996.         return 1;

  997.     case AV_PIX_FMT_YUVJ444P:

  998.         *format = AV_PIX_FMT_YUV444P;

  999.         return 1;

  1000.     case AV_PIX_FMT_YUVJ440P:

  1001.         *format = AV_PIX_FMT_YUV440P;

  1002.         return 1;

  1003.     case AV_PIX_FMT_GRAY8:

  1004.     case AV_PIX_FMT_YA8:

  1005.     case AV_PIX_FMT_GRAY16LE:

  1006.     case AV_PIX_FMT_GRAY16BE:

  1007.     case AV_PIX_FMT_YA16BE:

  1008.     case AV_PIX_FMT_YA16LE:

  1009.         return 1;

  1010.     default:

  1011.         return 0;

  1012.     }

  1013. }

  1014. 

  1015. static int handle_0alpha(enum AVPixelFormat *format)

  1016. {

  1017.     switch (*format) {

  1018.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1019.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1020.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1021.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1022.     default:                                          return 0;

  1023.     }

  1024. }

  1025. 

  1026. static int handle_xyz(enum AVPixelFormat *format)

  1027. {

  1028.     switch (*format) {

  1029.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1030.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1031.     default:                                                return 0;

  1032.     }

  1033. }

  1034. 

  1035. static void handle_formats(SwsContext *c)

  1036. {

  1037.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1038.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1039.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1040.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1041.     if (c->srcXYZ || c->dstXYZ)

  1042.         fill_xyztables(c);

  1043. }

  1044. 

  1045. SwsContext *sws_alloc_context(void)

  1046. {

  1047.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1048. 

  1049.     av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));

  1050. 

  1051.     if (c) {

  1052.         c->av_class = &ff_sws_context_class;

  1053.         av_opt_set_defaults(c);

  1054.     }

  1055. 

  1056.     return c;

  1057. }

  1058. 

  1059. static uint16_t * alloc_gamma_tbl(double e)

  1060. {

  1061.     int i = 0;

  1062.     uint16_t * tbl;

  1063.     tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);

  1064.     if (!tbl)

  1065.         return NULL;

  1066. 

  1067.     for (i = 0; i < 65536; ++i) {

  1068.         tbl[i] = pow(i / 65535.0, e) * 65535.0;

  1069.     }

  1070.     return tbl;

  1071. }

  1072. 

  1073. static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)

  1074. {

  1075.     switch(fmt) {

  1076.     case AV_PIX_FMT_ARGB:       return AV_PIX_FMT_RGB24;

  1077.     case AV_PIX_FMT_RGBA:       return AV_PIX_FMT_RGB24;

  1078.     case AV_PIX_FMT_ABGR:       return AV_PIX_FMT_BGR24;

  1079.     case AV_PIX_FMT_BGRA:       return AV_PIX_FMT_BGR24;

  1080.     case AV_PIX_FMT_YA8:        return AV_PIX_FMT_GRAY8;

  1081. 

  1082.     case AV_PIX_FMT_YUVA420P:   return AV_PIX_FMT_YUV420P;

  1083.     case AV_PIX_FMT_YUVA422P:   return AV_PIX_FMT_YUV422P;

  1084.     case AV_PIX_FMT_YUVA444P:           return AV_PIX_FMT_YUV444P;

  1085. 

  1086.     case AV_PIX_FMT_GBRAP:              return AV_PIX_FMT_GBRP;

  1087. 

  1088.     case AV_PIX_FMT_GBRAP12LE:          return AV_PIX_FMT_GBRP12;

  1089.     case AV_PIX_FMT_GBRAP12BE:          return AV_PIX_FMT_GBRP12;

  1090. 

  1091.     case AV_PIX_FMT_GBRAP16LE:          return AV_PIX_FMT_GBRP16;

  1092.     case AV_PIX_FMT_GBRAP16BE:          return AV_PIX_FMT_GBRP16;

  1093. 

  1094.     case AV_PIX_FMT_RGBA64LE:   return AV_PIX_FMT_RGB48;

  1095.     case AV_PIX_FMT_RGBA64BE:   return AV_PIX_FMT_RGB48;

  1096.     case AV_PIX_FMT_BGRA64LE:   return AV_PIX_FMT_BGR48;

  1097.     case AV_PIX_FMT_BGRA64BE:   return AV_PIX_FMT_BGR48;

  1098. 

  1099.     case AV_PIX_FMT_YA16BE:             return AV_PIX_FMT_GRAY16;

  1100.     case AV_PIX_FMT_YA16LE:             return AV_PIX_FMT_GRAY16;

  1101. 

  1102.     case AV_PIX_FMT_YUVA420P9BE:        return AV_PIX_FMT_YUV420P9;

  1103.     case AV_PIX_FMT_YUVA422P9BE:        return AV_PIX_FMT_YUV422P9;

  1104.     case AV_PIX_FMT_YUVA444P9BE:        return AV_PIX_FMT_YUV444P9;

  1105.     case AV_PIX_FMT_YUVA420P9LE:        return AV_PIX_FMT_YUV420P9;

  1106.     case AV_PIX_FMT_YUVA422P9LE:        return AV_PIX_FMT_YUV422P9;

  1107.     case AV_PIX_FMT_YUVA444P9LE:        return AV_PIX_FMT_YUV444P9;

  1108.     case AV_PIX_FMT_YUVA420P10BE:       return AV_PIX_FMT_YUV420P10;

  1109.     case AV_PIX_FMT_YUVA422P10BE:       return AV_PIX_FMT_YUV422P10;

  1110.     case AV_PIX_FMT_YUVA444P10BE:       return AV_PIX_FMT_YUV444P10;

  1111.     case AV_PIX_FMT_YUVA420P10LE:       return AV_PIX_FMT_YUV420P10;

  1112.     case AV_PIX_FMT_YUVA422P10LE:       return AV_PIX_FMT_YUV422P10;

  1113.     case AV_PIX_FMT_YUVA444P10LE:       return AV_PIX_FMT_YUV444P10;

  1114.     case AV_PIX_FMT_YUVA420P16BE:       return AV_PIX_FMT_YUV420P16;

  1115.     case AV_PIX_FMT_YUVA422P16BE:       return AV_PIX_FMT_YUV422P16;

  1116.     case AV_PIX_FMT_YUVA444P16BE:       return AV_PIX_FMT_YUV444P16;

  1117.     case AV_PIX_FMT_YUVA420P16LE:       return AV_PIX_FMT_YUV420P16;

  1118.     case AV_PIX_FMT_YUVA422P16LE:       return AV_PIX_FMT_YUV422P16;

  1119.     case AV_PIX_FMT_YUVA444P16LE:       return AV_PIX_FMT_YUV444P16;

  1120. 

  1121. //     case AV_PIX_FMT_AYUV64LE:

  1122. //     case AV_PIX_FMT_AYUV64BE:

  1123. //     case AV_PIX_FMT_PAL8:

  1124.     default: return AV_PIX_FMT_NONE;

  1125.     }

  1126. }

  1127. 

  1128. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1129.                              SwsFilter *dstFilter)

  1130. {

  1131.     int i, j;

  1132.     int usesVFilter, usesHFilter;

  1133.     int unscaled;

  1134.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1135.     int srcW              = c->srcW;

  1136.     int srcH              = c->srcH;

  1137.     int dstW              = c->dstW;

  1138.     int dstH              = c->dstH;

  1139.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1140.     int flags, cpu_flags;

  1141.     enum AVPixelFormat srcFormat = c->srcFormat;

  1142.     enum AVPixelFormat dstFormat = c->dstFormat;

  1143.     const AVPixFmtDescriptor *desc_src;

  1144.     const AVPixFmtDescriptor *desc_dst;

  1145.     int ret = 0;

  1146.     enum AVPixelFormat tmpFmt;

  1147. 

  1148.     cpu_flags = av_get_cpu_flags();

  1149.     flags     = c->flags;

  1150.     emms_c();

  1151.     if (!rgb15to16)

  1152.         ff_sws_rgb2rgb_init();

  1153. 

  1154.     unscaled = (srcW == dstW && srcH == dstH);

  1155. 

  1156.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1157.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1158. 

  1159.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1160.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1161. 

  1162.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1163.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1164.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1165.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1166. 

  1167.     handle_formats(c);

  1168.     srcFormat = c->srcFormat;

  1169.     dstFormat = c->dstFormat;

  1170.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1171.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1172. 

  1173.     // If the source has no alpha then disable alpha blendaway

  1174.     if (c->src0Alpha)

  1175.         c->alphablend = SWS_ALPHA_BLEND_NONE;

  1176. 

  1177.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1178.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1179.     if (!sws_isSupportedInput(srcFormat)) {

  1180.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1181.                av_get_pix_fmt_name(srcFormat));

  1182.         return AVERROR(EINVAL);

  1183.     }

  1184.     if (!sws_isSupportedOutput(dstFormat)) {

  1185.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1186.                av_get_pix_fmt_name(dstFormat));

  1187.         return AVERROR(EINVAL);

  1188.     }

  1189.     }

  1190.     av_assert2(desc_src && desc_dst);

  1191. 

  1192.     i = flags & (SWS_POINT         |

  1193.                  SWS_AREA          |

  1194.                  SWS_BILINEAR      |

  1195.                  SWS_FAST_BILINEAR |

  1196.                  SWS_BICUBIC       |

  1197.                  SWS_X             |

  1198.                  SWS_GAUSS         |

  1199.                  SWS_LANCZOS       |

  1200.                  SWS_SINC          |

  1201.                  SWS_SPLINE        |

  1202.                  SWS_BICUBLIN);

  1203. 

  1204.     /* provide a default scaler if not set by caller */

  1205.     if (!i) {

  1206.         if (dstW < srcW && dstH < srcH)

  1207.             flags |= SWS_BICUBIC;

  1208.         else if (dstW > srcW && dstH > srcH)

  1209.             flags |= SWS_BICUBIC;

  1210.         else

  1211.             flags |= SWS_BICUBIC;

  1212.         c->flags = flags;

  1213.     } else if (i & (i - 1)) {

  1214.         av_log(c, AV_LOG_ERROR,

  1215.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1216.         return AVERROR(EINVAL);

  1217.     }

  1218.     /* sanity check */

  1219.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1220.         /* FIXME check if these are enough and try to lower them after

  1221.          * fixing the relevant parts of the code */

  1222.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1223.                srcW, srcH, dstW, dstH);

  1224.         return AVERROR(EINVAL);

  1225.     }

  1226.     if (flags & SWS_FAST_BILINEAR) {

  1227.         if (srcW < 8 || dstW < 8) {

  1228.             flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;

  1229.             c->flags = flags;

  1230.         }

  1231.     }

  1232. 

  1233.     if (!dstFilter)

  1234.         dstFilter = &dummyFilter;

  1235.     if (!srcFilter)

  1236.         srcFilter = &dummyFilter;

  1237. 

  1238.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1239.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1240.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1241.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1242.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1243. 

  1244.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1245.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1246.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1247.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1248.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1249.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1250.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1251.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1252. 

  1253.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1254.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1255. 

  1256.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1257.         if (dstW&1) {

  1258.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1259.             flags |= SWS_FULL_CHR_H_INT;

  1260.             c->flags = flags;

  1261.         }

  1262. 

  1263.         if (   c->chrSrcHSubSample == 0

  1264.             && c->chrSrcVSubSample == 0

  1265.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1266.             && !(c->flags & SWS_FAST_BILINEAR)

  1267.         ) {

  1268.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1269.             flags |= SWS_FULL_CHR_H_INT;

  1270.             c->flags = flags;

  1271.         }

  1272.     }

  1273. 

  1274.     if (c->dither == SWS_DITHER_AUTO) {

  1275.         if (flags & SWS_ERROR_DIFFUSION)

  1276.             c->dither = SWS_DITHER_ED;

  1277.     }

  1278. 

  1279.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1280.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1281.        dstFormat == AV_PIX_FMT_BGR8 ||

  1282.        dstFormat == AV_PIX_FMT_RGB8) {

  1283.         if (c->dither == SWS_DITHER_AUTO)

  1284.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1285.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1286.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1287.                 av_log(c, AV_LOG_DEBUG,

  1288.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1289.                     av_get_pix_fmt_name(dstFormat));

  1290.                 flags   |= SWS_FULL_CHR_H_INT;

  1291.                 c->flags = flags;

  1292.             }

  1293.         }

  1294.         if (flags & SWS_FULL_CHR_H_INT) {

  1295.             if (c->dither == SWS_DITHER_BAYER) {

  1296.                 av_log(c, AV_LOG_DEBUG,

  1297.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1298.                     av_get_pix_fmt_name(dstFormat));

  1299.                 c->dither = SWS_DITHER_ED;

  1300.             }

  1301.         }

  1302.     }

  1303.     if (isPlanarRGB(dstFormat)) {

  1304.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1305.             av_log(c, AV_LOG_DEBUG,

  1306.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1307.                    av_get_pix_fmt_name(dstFormat));

  1308.             flags   |= SWS_FULL_CHR_H_INT;

  1309.             c->flags = flags;

  1310.         }

  1311.     }

  1312. 

  1313.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1314.      * chroma interpolation */

  1315.     if (flags & SWS_FULL_CHR_H_INT &&

  1316.         isAnyRGB(dstFormat)        &&

  1317.         !isPlanarRGB(dstFormat)    &&

  1318.         dstFormat != AV_PIX_FMT_RGBA64LE &&

  1319.         dstFormat != AV_PIX_FMT_RGBA64BE &&

  1320.         dstFormat != AV_PIX_FMT_BGRA64LE &&

  1321.         dstFormat != AV_PIX_FMT_BGRA64BE &&

  1322.         dstFormat != AV_PIX_FMT_RGB48LE &&

  1323.         dstFormat != AV_PIX_FMT_RGB48BE &&

  1324.         dstFormat != AV_PIX_FMT_BGR48LE &&

  1325.         dstFormat != AV_PIX_FMT_BGR48BE &&

  1326.         dstFormat != AV_PIX_FMT_RGBA  &&

  1327.         dstFormat != AV_PIX_FMT_ARGB  &&

  1328.         dstFormat != AV_PIX_FMT_BGRA  &&

  1329.         dstFormat != AV_PIX_FMT_ABGR  &&

  1330.         dstFormat != AV_PIX_FMT_RGB24 &&

  1331.         dstFormat != AV_PIX_FMT_BGR24 &&

  1332.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1333.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1334.         dstFormat != AV_PIX_FMT_BGR8 &&

  1335.         dstFormat != AV_PIX_FMT_RGB8

  1336.     ) {

  1337.         av_log(c, AV_LOG_WARNING,

  1338.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1339.                av_get_pix_fmt_name(dstFormat));

  1340.         flags   &= ~SWS_FULL_CHR_H_INT;

  1341.         c->flags = flags;

  1342.     }

  1343.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1344.         c->chrDstHSubSample = 1;

  1345. 

  1346.     // drop some chroma lines if the user wants it

  1347.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1348.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1349.     c->chrSrcVSubSample += c->vChrDrop;

  1350. 

  1351.     /* drop every other pixel for chroma calculation unless user

  1352.      * wants full chroma */

  1353.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1354.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1355.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1356.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1357.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1358.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1359.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1360.         srcFormat != AV_PIX_FMT_GBRAP12BE && srcFormat != AV_PIX_FMT_GBRAP12LE &&

  1361.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1362.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1363.         srcFormat != AV_PIX_FMT_GBRAP16BE  && srcFormat != AV_PIX_FMT_GBRAP16LE &&

  1364.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1365.          (flags & SWS_FAST_BILINEAR)))

  1366.         c->chrSrcHSubSample = 1;

  1367. 

  1368.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1369.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1370.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1371.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1372.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1373. 

  1374.     FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1375. 

  1376.     c->srcBpc = desc_src->comp[0].depth;

  1377.     if (c->srcBpc < 8)

  1378.         c->srcBpc = 8;

  1379.     c->dstBpc = desc_dst->comp[0].depth;

  1380.     if (c->dstBpc < 8)

  1381.         c->dstBpc = 8;

  1382.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1383.         c->srcBpc = 16;

  1384.     if (c->dstBpc == 16)

  1385.         dst_stride <<= 1;

  1386. 

  1387.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1388.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1389.                              c->chrDstW >= c->chrSrcW &&

  1390.                              (srcW & 15) == 0;

  1391.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1392. 

  1393.             && (flags & SWS_FAST_BILINEAR)) {

  1394.             if (flags & SWS_PRINT_INFO)

  1395.                 av_log(c, AV_LOG_INFO,

  1396.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1397.         }

  1398.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1399.             c->canMMXEXTBeUsed = 0;

  1400.     } else

  1401.         c->canMMXEXTBeUsed = 0;

  1402. 

  1403.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1404.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1405. 

  1406.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1407.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1408.      * correct scaling.

  1409.      * n-2 is the last chrominance sample available.

  1410.      * This is not perfect, but no one should notice the difference, the more

  1411.      * correct variant would be like the vertical one, but that would require

  1412.      * some special code for the first and last pixel */

  1413.     if (flags & SWS_FAST_BILINEAR) {

  1414.         if (c->canMMXEXTBeUsed) {

  1415.             c->lumXInc += 20;

  1416.             c->chrXInc += 20;

  1417.         }

  1418.         // we don't use the x86 asm scaler if MMX is available

  1419.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1420.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1421.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1422.         }

  1423.     }

  1424. 

  1425.     // hardcoded for now

  1426.     c->gamma_value = 2.2;

  1427.     tmpFmt = AV_PIX_FMT_RGBA64LE;

  1428. 

  1429. 

  1430.     if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {

  1431.         SwsContext *c2;

  1432.         c->cascaded_context[0] = NULL;

  1433. 

  1434.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1435.                             srcW, srcH, tmpFmt, 64);

  1436.         if (ret < 0)

  1437.             return ret;

  1438. 

  1439.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1440.                                                 srcW, srcH, tmpFmt,

  1441.                                                 flags, NULL, NULL, c->param);

  1442.         if (!c->cascaded_context[0]) {

  1443.             return -1;

  1444.         }

  1445. 

  1446.         c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,

  1447.                                                 dstW, dstH, tmpFmt,

  1448.                                                 flags, srcFilter, dstFilter, c->param);

  1449. 

  1450.         if (!c->cascaded_context[1])

  1451.             return -1;

  1452. 

  1453.         c2 = c->cascaded_context[1];

  1454.         c2->is_internal_gamma = 1;

  1455.         c2->gamma     = alloc_gamma_tbl(    c->gamma_value);

  1456.         c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);

  1457.         if (!c2->gamma || !c2->inv_gamma)

  1458.             return AVERROR(ENOMEM);

  1459. 

  1460.         // is_internal_flag is set after creating the context

  1461.         // to properly create the gamma convert FilterDescriptor

  1462.         // we have to re-initialize it

  1463.         ff_free_filters(c2);

  1464.         if (ff_init_filters(c2) < 0) {

  1465.             sws_freeContext(c2);

  1466.             return -1;

  1467.         }

  1468. 

  1469.         c->cascaded_context[2] = NULL;

  1470.         if (dstFormat != tmpFmt) {

  1471.             ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,

  1472.                                 dstW, dstH, tmpFmt, 64);

  1473.             if (ret < 0)

  1474.                 return ret;

  1475. 

  1476.             c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,

  1477.                                                 dstW, dstH, dstFormat,

  1478.                                                 flags, NULL, NULL, c->param);

  1479.             if (!c->cascaded_context[2])

  1480.                 return -1;

  1481.         }

  1482.         return 0;

  1483.     }

  1484. 

  1485.     if (isBayer(srcFormat)) {

  1486.         if (!unscaled ||

  1487.             (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {

  1488.             enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;

  1489. 

  1490.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1491.                                 srcW, srcH, tmpFormat, 64);

  1492.             if (ret < 0)

  1493.                 return ret;

  1494. 

  1495.             c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1496.                                                     srcW, srcH, tmpFormat,

  1497.                                                     flags, srcFilter, NULL, c->param);

  1498.             if (!c->cascaded_context[0])

  1499.                 return -1;

  1500. 

  1501.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1502.                                                     dstW, dstH, dstFormat,

  1503.                                                     flags, NULL, dstFilter, c->param);

  1504.             if (!c->cascaded_context[1])

  1505.                 return -1;

  1506.             return 0;

  1507.         }

  1508.     }

  1509. 

  1510.     if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {

  1511.         enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);

  1512. 

  1513.         if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)

  1514.         if (!unscaled ||

  1515.             dstFormat != tmpFormat ||

  1516.             usesHFilter || usesVFilter ||

  1517.             c->srcRange != c->dstRange

  1518.         ) {

  1519.             c->cascaded_mainindex = 1;

  1520.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1521.                                 srcW, srcH, tmpFormat, 64);

  1522.             if (ret < 0)

  1523.                 return ret;

  1524. 

  1525.             c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1526.                                                         srcW, srcH, tmpFormat,

  1527.                                                         flags, c->param);

  1528.             if (!c->cascaded_context[0])

  1529.                 return -1;

  1530.             c->cascaded_context[0]->alphablend = c->alphablend;

  1531.             ret = sws_init_context(c->cascaded_context[0], NULL , NULL);

  1532.             if (ret < 0)

  1533.                 return ret;

  1534. 

  1535.             c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,

  1536.                                                         dstW, dstH, dstFormat,

  1537.                                                         flags, c->param);

  1538.             if (!c->cascaded_context[1])

  1539.                 return -1;

  1540. 

  1541.             c->cascaded_context[1]->srcRange = c->srcRange;

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

  1543.             ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);

  1544.             if (ret < 0)

  1545.                 return ret;

  1546. 

  1547.             return 0;

  1548.         }

  1549.     }

  1550. 

  1551. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1552. 

  1553.     /* precalculate horizontal scaler filter coefficients */

  1554.     {

  1555. #if HAVE_MMXEXT_INLINE

  1556. // can't downscale !!!

  1557.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1558.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1559.                                                              NULL, NULL, 8);

  1560.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1561.                                                              NULL, NULL, NULL, 4);

  1562. 

  1563. #if USE_MMAP

  1564.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1565.                                           PROT_READ | PROT_WRITE,

  1566.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1567.                                           -1, 0);

  1568.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1569.                                           PROT_READ | PROT_WRITE,

  1570.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1571.                                           -1, 0);

  1572. #elif HAVE_VIRTUALALLOC

  1573.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1574.                                                   c->lumMmxextFilterCodeSize,

  1575.                                                   MEM_COMMIT,

  1576.                                                   PAGE_EXECUTE_READWRITE);

  1577.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1578.                                                   c->chrMmxextFilterCodeSize,

  1579.                                                   MEM_COMMIT,

  1580.                                                   PAGE_EXECUTE_READWRITE);

  1581. #else

  1582.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1583.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1584. #endif

  1585. 

  1586. #ifdef MAP_ANONYMOUS

  1587.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1588. #else

  1589.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1590. #endif

  1591.             {

  1592.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1593.                 return AVERROR(ENOMEM);

  1594.             }

  1595. 

  1596.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1597.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1598.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1599.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1600. 

  1601.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1602.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1603.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1604.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1605. 

  1606. #if USE_MMAP

  1607.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1608.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1609.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1610.                 goto fail;

  1611.             }

  1612. #endif

  1613.         } else

  1614. #endif /* HAVE_MMXEXT_INLINE */

  1615.         {

  1616.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1617.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1618. 

  1619.             if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1620.                            &c->hLumFilterSize, c->lumXInc,

  1621.                            srcW, dstW, filterAlign, 1 << 14,

  1622.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1623.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1624.                            c->param,

  1625.                            get_local_pos(c, 0, 0, 0),

  1626.                            get_local_pos(c, 0, 0, 0))) < 0)

  1627.                 goto fail;

  1628.             if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1629.                            &c->hChrFilterSize, c->chrXInc,

  1630.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1631.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1632.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1633.                            c->param,

  1634.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1635.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)

  1636.                 goto fail;

  1637.         }

  1638.     } // initialize horizontal stuff

  1639. 

  1640.     /* precalculate vertical scaler filter coefficients */

  1641.     {

  1642.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1643.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1644. 

  1645.         if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1646.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1647.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1648.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1649.                        c->param,

  1650.                        get_local_pos(c, 0, 0, 1),

  1651.                        get_local_pos(c, 0, 0, 1))) < 0)

  1652.             goto fail;

  1653.         if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1654.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1655.                        filterAlign, (1 << 12),

  1656.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1657.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1658.                        c->param,

  1659.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1660.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)

  1661. 

  1662.             goto fail;

  1663. 

  1664. #if HAVE_ALTIVEC

  1665.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1666.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1667. 

  1668.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1669.             int j;

  1670.             short *p = (short *)&c->vYCoeffsBank[i];

  1671.             for (j = 0; j < 8; j++)

  1672.                 p[j] = c->vLumFilter[i];

  1673.         }

  1674. 

  1675.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1676.             int j;

  1677.             short *p = (short *)&c->vCCoeffsBank[i];

  1678.             for (j = 0; j < 8; j++)

  1679.                 p[j] = c->vChrFilter[i];

  1680.         }

  1681. #endif

  1682.     }

  1683. 

  1684.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1685.     c->vLumBufSize = c->vLumFilterSize;

  1686.     c->vChrBufSize = c->vChrFilterSize;

  1687.     for (i = 0; i < dstH; i++) {

  1688.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1689.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1690.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1691.                                << c->chrSrcVSubSample));

  1692. 

  1693.         nextSlice >>= c->chrSrcVSubSample;

  1694.         nextSlice <<= c->chrSrcVSubSample;

  1695.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1696.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1697.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1698.             (nextSlice >> c->chrSrcVSubSample))

  1699.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1700.                              c->vChrFilterPos[chrI];

  1701.     }

  1702. 

  1703.     for (i = 0; i < 4; i++)

  1704.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1705. 

  1706.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1707.      * need to allocate several megabytes to handle all possible cases) */

  1708.     FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1709.     FF_ALLOCZ_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1710.     FF_ALLOCZ_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1711.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1712.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1713.     /* Note we need at least one pixel more at the end because of the MMX code

  1714.      * (just in case someone wants to replace the 4000/8000). */

  1715.     /* align at 16 bytes for AltiVec */

  1716.     for (i = 0; i < c->vLumBufSize; i++) {

  1717.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1718.                           dst_stride + 16, fail);

  1719.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1720.     }

  1721.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1722.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1723.     c->uv_offx2 = dst_stride + 16;

  1724.     for (i = 0; i < c->vChrBufSize; i++) {

  1725.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1726.                          dst_stride * 2 + 32, fail);

  1727.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1728.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1729.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1730.     }

  1731.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1732.         for (i = 0; i < c->vLumBufSize; i++) {

  1733.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1734.                               dst_stride + 16, fail);

  1735.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1736.         }

  1737. 

  1738.     // try to avoid drawing green stuff between the right end and the stride end

  1739.     for (i = 0; i < c->vChrBufSize; i++)

  1740.         if(desc_dst->comp[0].depth == 16){

  1741.             av_assert0(c->dstBpc > 14);

  1742.             for(j=0; j<dst_stride/2+1; j++)

  1743.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1744.         } else

  1745.             for(j=0; j<dst_stride+1; j++)

  1746.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1747. 

  1748.     av_assert0(c->chrDstH <= dstH);

  1749. 

  1750.     if (flags & SWS_PRINT_INFO) {

  1751.         const char *scaler = NULL, *cpucaps;

  1752. 

  1753.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1754.             if (flags & scale_algorithms[i].flag) {

  1755.                 scaler = scale_algorithms[i].description;

  1756.                 break;

  1757.             }

  1758.         }

  1759.         if (!scaler)

  1760.             scaler =  "ehh flags invalid?!";

  1761.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1762.                scaler,

  1763.                av_get_pix_fmt_name(srcFormat),

  1764. #ifdef DITHER1XBPP

  1765.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1766.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1767.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1768.                                                              "dithered " : "",

  1769. #else

  1770.                "",

  1771. #endif

  1772.                av_get_pix_fmt_name(dstFormat));

  1773. 

  1774.         if (INLINE_MMXEXT(cpu_flags))

  1775.             cpucaps = "MMXEXT";

  1776.         else if (INLINE_AMD3DNOW(cpu_flags))

  1777.             cpucaps = "3DNOW";

  1778.         else if (INLINE_MMX(cpu_flags))

  1779.             cpucaps = "MMX";

  1780.         else if (PPC_ALTIVEC(cpu_flags))

  1781.             cpucaps = "AltiVec";

  1782.         else

  1783.             cpucaps = "C";

  1784. 

  1785.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1786. 

  1787.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1788.         av_log(c, AV_LOG_DEBUG,

  1789.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1790.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1791.         av_log(c, AV_LOG_DEBUG,

  1792.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1793.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1794.                c->chrXInc, c->chrYInc);

  1795.     }

  1796. 

  1797.     /* alpha blend special case, note this has been split via cascaded contexts if its scaled */

  1798.     if (unscaled && !usesHFilter && !usesVFilter &&

  1799.         c->alphablend != SWS_ALPHA_BLEND_NONE &&

  1800.         isALPHA(srcFormat) &&

  1801.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&

  1802.         alphaless_fmt(srcFormat) == dstFormat

  1803.     ) {

  1804.         c->swscale = ff_sws_alphablendaway;

  1805. 

  1806.         if (flags & SWS_PRINT_INFO)

  1807.             av_log(c, AV_LOG_INFO,

  1808.                     "using alpha blendaway %s -> %s special converter\n",

  1809.                     av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1810.         return 0;

  1811.     }

  1812. 

  1813.     /* unscaled special cases */

  1814.     if (unscaled && !usesHFilter && !usesVFilter &&

  1815.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1816.         ff_get_unscaled_swscale(c);

  1817. 

  1818.         if (c->swscale) {

  1819.             if (flags & SWS_PRINT_INFO)

  1820.                 av_log(c, AV_LOG_INFO,

  1821.                        "using unscaled %s -> %s special converter\n",

  1822.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1823.             return 0;

  1824.         }

  1825.     }

  1826. 

  1827.     c->swscale = ff_getSwsFunc(c);

  1828.     return ff_init_filters(c);

  1829. fail: // FIXME replace things by appropriate error codes

  1830.     if (ret == RETCODE_USE_CASCADE)  {

  1831.         int tmpW = sqrt(srcW * (int64_t)dstW);

  1832.         int tmpH = sqrt(srcH * (int64_t)dstH);

  1833.         enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;

  1834. 

  1835.         if (isALPHA(srcFormat))

  1836.             tmpFormat = AV_PIX_FMT_YUVA420P;

  1837. 

  1838.         if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)

  1839.             return AVERROR(EINVAL);

  1840. 

  1841.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1842.                              tmpW, tmpH, tmpFormat, 64);

  1843.         if (ret < 0)

  1844.             return ret;

  1845. 

  1846.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1847.                                                 tmpW, tmpH, tmpFormat,

  1848.                                                 flags, srcFilter, NULL, c->param);

  1849.         if (!c->cascaded_context[0])

  1850.             return -1;

  1851. 

  1852.         c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,

  1853.                                                 dstW, dstH, dstFormat,

  1854.                                                 flags, NULL, dstFilter, c->param);

  1855.         if (!c->cascaded_context[1])

  1856.             return -1;

  1857.         return 0;

  1858.     }

  1859.     return -1;

  1860. }

  1861. 

  1862. SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1863.                                int dstW, int dstH, enum AVPixelFormat dstFormat,

  1864.                                int flags, const double *param)

  1865. {

  1866.     SwsContext *c;

  1867. 

  1868.     if (!(c = sws_alloc_context()))

  1869.         return NULL;

  1870. 

  1871.     c->flags     = flags;

  1872.     c->srcW      = srcW;

  1873.     c->srcH      = srcH;

  1874.     c->dstW      = dstW;

  1875.     c->dstH      = dstH;

  1876.     c->srcFormat = srcFormat;

  1877.     c->dstFormat = dstFormat;

  1878. 

  1879.     if (param) {

  1880.         c->param[0] = param[0];

  1881.         c->param[1] = param[1];

  1882.     }

  1883. 

  1884.     return c;

  1885. }

  1886. 

  1887. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1888.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1889.                            int flags, SwsFilter *srcFilter,

  1890.                            SwsFilter *dstFilter, const double *param)

  1891. {

  1892.     SwsContext *c;

  1893. 

  1894.     c = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1895.                            dstW, dstH, dstFormat,

  1896.                            flags, param);

  1897.     if (!c)

  1898.         return NULL;

  1899. 

  1900.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1901.         sws_freeContext(c);

  1902.         return NULL;

  1903.     }

  1904. 

  1905.     return c;

  1906. }

  1907. 

  1908. static int isnan_vec(SwsVector *a)

  1909. {

  1910.     int i;

  1911.     for (i=0; i<a->length; i++)

  1912.         if (isnan(a->coeff[i]))

  1913.             return 1;

  1914.     return 0;

  1915. }

  1916. 

  1917. static void makenan_vec(SwsVector *a)

  1918. {

  1919.     int i;

  1920.     for (i=0; i<a->length; i++)

  1921.         a->coeff[i] = NAN;

  1922. }

  1923. 

  1924. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1925.                                 float lumaSharpen, float chromaSharpen,

  1926.                                 float chromaHShift, float chromaVShift,

  1927.                                 int verbose)

  1928. {

  1929.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1930.     if (!filter)

  1931.         return NULL;

  1932. 

  1933.     if (lumaGBlur != 0.0) {

  1934.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1935.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1936.     } else {

  1937.         filter->lumH = sws_getIdentityVec();

  1938.         filter->lumV = sws_getIdentityVec();

  1939.     }

  1940. 

  1941.     if (chromaGBlur != 0.0) {

  1942.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1943.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1944.     } else {

  1945.         filter->chrH = sws_getIdentityVec();

  1946.         filter->chrV = sws_getIdentityVec();

  1947.     }

  1948. 

  1949.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1950.         goto fail;

  1951. 

  1952.     if (chromaSharpen != 0.0) {

  1953.         SwsVector *id = sws_getIdentityVec();

  1954.         if (!id)

  1955.             goto fail;

  1956.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1957.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1958.         sws_addVec(filter->chrH, id);

  1959.         sws_addVec(filter->chrV, id);

  1960.         sws_freeVec(id);

  1961.     }

  1962. 

  1963.     if (lumaSharpen != 0.0) {

  1964.         SwsVector *id = sws_getIdentityVec();

  1965.         if (!id)

  1966.             goto fail;

  1967.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1968.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1969.         sws_addVec(filter->lumH, id);

  1970.         sws_addVec(filter->lumV, id);

  1971.         sws_freeVec(id);

  1972.     }

  1973. 

  1974.     if (chromaHShift != 0.0)

  1975.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1976. 

  1977.     if (chromaVShift != 0.0)

  1978.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1979. 

  1980.     sws_normalizeVec(filter->chrH, 1.0);

  1981.     sws_normalizeVec(filter->chrV, 1.0);

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

  1983.     sws_normalizeVec(filter->lumV, 1.0);

  1984. 

  1985.     if (isnan_vec(filter->chrH) ||

  1986.         isnan_vec(filter->chrV) ||

  1987.         isnan_vec(filter->lumH) ||

  1988.         isnan_vec(filter->lumV))

  1989.         goto fail;

  1990. 

  1991.     if (verbose)

  1992.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1993.     if (verbose)

  1994.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1995. 

  1996.     return filter;

  1997. 

  1998. fail:

  1999.     sws_freeVec(filter->lumH);

  2000.     sws_freeVec(filter->lumV);

  2001.     sws_freeVec(filter->chrH);

  2002.     sws_freeVec(filter->chrV);

  2003.     av_freep(&filter);

  2004.     return NULL;

  2005. }

  2006. 

  2007. SwsVector *sws_allocVec(int length)

  2008. {

  2009.     SwsVector *vec;

  2010. 

  2011.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  2012.         return NULL;

  2013. 

  2014.     vec = av_malloc(sizeof(SwsVector));

  2015.     if (!vec)

  2016.         return NULL;

  2017.     vec->length = length;

  2018.     vec->coeff  = av_malloc(sizeof(double) * length);

  2019.     if (!vec->coeff)

  2020.         av_freep(&vec);

  2021.     return vec;

  2022. }

  2023. 

  2024. SwsVector *sws_getGaussianVec(double variance, double quality)

  2025. {

  2026.     const int length = (int)(variance * quality + 0.5) | 1;

  2027.     int i;

  2028.     double middle  = (length - 1) * 0.5;

  2029.     SwsVector *vec;

  2030. 

  2031.     if(variance < 0 || quality < 0)

  2032.         return NULL;

  2033. 

  2034.     vec = sws_allocVec(length);

  2035. 

  2036.     if (!vec)

  2037.         return NULL;

  2038. 

  2039.     for (i = 0; i < length; i++) {

  2040.         double dist = i - middle;

  2041.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  2042.                         sqrt(2 * variance * M_PI);

  2043.     }

  2044. 

  2045.     sws_normalizeVec(vec, 1.0);

  2046. 

  2047.     return vec;

  2048. }

  2049. 

  2050. SwsVector *sws_getConstVec(double c, int length)

  2051. {

  2052.     int i;

  2053.     SwsVector *vec = sws_allocVec(length);

  2054. 

  2055.     if (!vec)

  2056.         return NULL;

  2057. 

  2058.     for (i = 0; i < length; i++)

  2059.         vec->coeff[i] = c;

  2060. 

  2061.     return vec;

  2062. }

  2063. 

  2064. SwsVector *sws_getIdentityVec(void)

  2065. {

  2066.     return sws_getConstVec(1.0, 1);

  2067. }

  2068. 

  2069. static double sws_dcVec(SwsVector *a)

  2070. {

  2071.     int i;

  2072.     double sum = 0;

  2073. 

  2074.     for (i = 0; i < a->length; i++)

  2075.         sum += a->coeff[i];

  2076. 

  2077.     return sum;

  2078. }

  2079. 

  2080. void sws_scaleVec(SwsVector *a, double scalar)

  2081. {

  2082.     int i;

  2083. 

  2084.     for (i = 0; i < a->length; i++)

  2085.         a->coeff[i] *= scalar;

  2086. }

  2087. 

  2088. void sws_normalizeVec(SwsVector *a, double height)

  2089. {

  2090.     sws_scaleVec(a, height / sws_dcVec(a));

  2091. }

  2092. 

  2093. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  2094. {

  2095.     int length = a->length + b->length - 1;

  2096.     int i, j;

  2097.     SwsVector *vec = sws_getConstVec(0.0, length);

  2098. 

  2099.     if (!vec)

  2100.         return NULL;

  2101. 

  2102.     for (i = 0; i < a->length; i++) {

  2103.         for (j = 0; j < b->length; j++) {

  2104.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  2105.         }

  2106.     }

  2107. 

  2108.     return vec;

  2109. }

  2110. 

  2111. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  2112. {

  2113.     int length = FFMAX(a->length, b->length);

  2114.     int i;

  2115.     SwsVector *vec = sws_getConstVec(0.0, length);

  2116. 

  2117.     if (!vec)

  2118.         return NULL;

  2119. 

  2120.     for (i = 0; i < a->length; i++)

  2121.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2122.     for (i = 0; i < b->length; i++)

  2123.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  2124. 

  2125.     return vec;

  2126. }

  2127. 

  2128. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  2129. {

  2130.     int length = FFMAX(a->length, b->length);

  2131.     int i;

  2132.     SwsVector *vec = sws_getConstVec(0.0, length);

  2133. 

  2134.     if (!vec)

  2135.         return NULL;

  2136. 

  2137.     for (i = 0; i < a->length; i++)

  2138.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2139.     for (i = 0; i < b->length; i++)

  2140.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  2141. 

  2142.     return vec;

  2143. }

  2144. 

  2145. /* shift left / or right if "shift" is negative */

  2146. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  2147. {

  2148.     int length = a->length + FFABS(shift) * 2;

  2149.     int i;

  2150.     SwsVector *vec = sws_getConstVec(0.0, length);

  2151. 

  2152.     if (!vec)

  2153.         return NULL;

  2154. 

  2155.     for (i = 0; i < a->length; i++) {

  2156.         vec->coeff[i + (length    - 1) / 2 -

  2157.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  2158.     }

  2159. 

  2160.     return vec;

  2161. }

  2162. 

  2163. void sws_shiftVec(SwsVector *a, int shift)

  2164. {

  2165.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  2166.     if (!shifted) {

  2167.         makenan_vec(a);

  2168.         return;

  2169.     }

  2170.     av_free(a->coeff);

  2171.     a->coeff  = shifted->coeff;

  2172.     a->length = shifted->length;

  2173.     av_free(shifted);

  2174. }

  2175. 

  2176. void sws_addVec(SwsVector *a, SwsVector *b)

  2177. {

  2178.     SwsVector *sum = sws_sumVec(a, b);

  2179.     if (!sum) {

  2180.         makenan_vec(a);

  2181.         return;

  2182.     }

  2183.     av_free(a->coeff);

  2184.     a->coeff  = sum->coeff;

  2185.     a->length = sum->length;

  2186.     av_free(sum);

  2187. }

  2188. 

  2189. void sws_subVec(SwsVector *a, SwsVector *b)

  2190. {

  2191.     SwsVector *diff = sws_diffVec(a, b);

  2192.     if (!diff) {

  2193.         makenan_vec(a);

  2194.         return;

  2195.     }

  2196.     av_free(a->coeff);

  2197.     a->coeff  = diff->coeff;

  2198.     a->length = diff->length;

  2199.     av_free(diff);

  2200. }

  2201. 

  2202. void sws_convVec(SwsVector *a, SwsVector *b)

  2203. {

  2204.     SwsVector *conv = sws_getConvVec(a, b);

  2205.     if (!conv) {

  2206.         makenan_vec(a);

  2207.         return;

  2208.     }

  2209.     av_free(a->coeff);

  2210.     a->coeff  = conv->coeff;

  2211.     a->length = conv->length;

  2212.     av_free(conv);

  2213. }

  2214. 

  2215. SwsVector *sws_cloneVec(SwsVector *a)

  2216. {

  2217.     SwsVector *vec = sws_allocVec(a->length);

  2218. 

  2219.     if (!vec)

  2220.         return NULL;

  2221. 

  2222.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  2223. 

  2224.     return vec;

  2225. }

  2226. 

  2227. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  2228. {

  2229.     int i;

  2230.     double max = 0;

  2231.     double min = 0;

  2232.     double range;

  2233. 

  2234.     for (i = 0; i < a->length; i++)

  2235.         if (a->coeff[i] > max)

  2236.             max = a->coeff[i];

  2237. 

  2238.     for (i = 0; i < a->length; i++)

  2239.         if (a->coeff[i] < min)

  2240.             min = a->coeff[i];

  2241. 

  2242.     range = max - min;

  2243. 

  2244.     for (i = 0; i < a->length; i++) {

  2245.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  2246.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  2247.         for (; x > 0; x--)

  2248.             av_log(log_ctx, log_level, " ");

  2249.         av_log(log_ctx, log_level, "|\n");

  2250.     }

  2251. }

  2252. 

  2253. void sws_freeVec(SwsVector *a)

  2254. {

  2255.     if (!a)

  2256.         return;

  2257.     av_freep(&a->coeff);

  2258.     a->length = 0;

  2259.     av_free(a);

  2260. }

  2261. 

  2262. void sws_freeFilter(SwsFilter *filter)

  2263. {

  2264.     if (!filter)

  2265.         return;

  2266. 

  2267.     sws_freeVec(filter->lumH);

  2268.     sws_freeVec(filter->lumV);

  2269.     sws_freeVec(filter->chrH);

  2270.     sws_freeVec(filter->chrV);

  2271.     av_free(filter);

  2272. }

  2273. 

  2274. void sws_freeContext(SwsContext *c)

  2275. {

  2276.     int i;

  2277.     if (!c)

  2278.         return;

  2279. 

  2280.     if (c->lumPixBuf) {

  2281.         for (i = 0; i < c->vLumBufSize; i++)

  2282.             av_freep(&c->lumPixBuf[i]);

  2283.         av_freep(&c->lumPixBuf);

  2284.     }

  2285. 

  2286.     if (c->chrUPixBuf) {

  2287.         for (i = 0; i < c->vChrBufSize; i++)

  2288.             av_freep(&c->chrUPixBuf[i]);

  2289.         av_freep(&c->chrUPixBuf);

  2290.         av_freep(&c->chrVPixBuf);

  2291.     }

  2292. 

  2293.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2294.         for (i = 0; i < c->vLumBufSize; i++)

  2295.             av_freep(&c->alpPixBuf[i]);

  2296.         av_freep(&c->alpPixBuf);

  2297.     }

  2298. 

  2299.     for (i = 0; i < 4; i++)

  2300.         av_freep(&c->dither_error[i]);

  2301. 

  2302.     av_freep(&c->vLumFilter);

  2303.     av_freep(&c->vChrFilter);

  2304.     av_freep(&c->hLumFilter);

  2305.     av_freep(&c->hChrFilter);

  2306. #if HAVE_ALTIVEC

  2307.     av_freep(&c->vYCoeffsBank);

  2308.     av_freep(&c->vCCoeffsBank);

  2309. #endif

  2310. 

  2311.     av_freep(&c->vLumFilterPos);

  2312.     av_freep(&c->vChrFilterPos);

  2313.     av_freep(&c->hLumFilterPos);

  2314.     av_freep(&c->hChrFilterPos);

  2315. 

  2316. #if HAVE_MMX_INLINE

  2317. #if USE_MMAP

  2318.     if (c->lumMmxextFilterCode)

  2319.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2320.     if (c->chrMmxextFilterCode)

  2321.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2322. #elif HAVE_VIRTUALALLOC

  2323.     if (c->lumMmxextFilterCode)

  2324.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2325.     if (c->chrMmxextFilterCode)

  2326.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2327. #else

  2328.     av_free(c->lumMmxextFilterCode);

  2329.     av_free(c->chrMmxextFilterCode);

  2330. #endif

  2331.     c->lumMmxextFilterCode = NULL;

  2332.     c->chrMmxextFilterCode = NULL;

  2333. #endif /* HAVE_MMX_INLINE */

  2334. 

  2335.     av_freep(&c->yuvTable);

  2336.     av_freep(&c->formatConvBuffer);

  2337. 

  2338.     sws_freeContext(c->cascaded_context[0]);

  2339.     sws_freeContext(c->cascaded_context[1]);

  2340.     sws_freeContext(c->cascaded_context[2]);

  2341.     memset(c->cascaded_context, 0, sizeof(c->cascaded_context));

  2342.     av_freep(&c->cascaded_tmp[0]);

  2343.     av_freep(&c->cascaded1_tmp[0]);

  2344. 

  2345.     av_freep(&c->gamma);

  2346.     av_freep(&c->inv_gamma);

  2347. 

  2348.     ff_free_filters(c);

  2349. 

  2350.     av_free(c);

  2351. }

  2352. 

  2353. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2354.                                         int srcH, enum AVPixelFormat srcFormat,

  2355.                                         int dstW, int dstH,

  2356.                                         enum AVPixelFormat dstFormat, int flags,

  2357.                                         SwsFilter *srcFilter,

  2358.                                         SwsFilter *dstFilter,

  2359.                                         const double *param)

  2360. {

  2361.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2362.                                              SWS_PARAM_DEFAULT };

  2363.     int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,

  2364.             src_v_chr_pos = -513, dst_v_chr_pos = -513;

  2365. 

  2366.     if (!param)

  2367.         param = default_param;

  2368. 

  2369.     if (context &&

  2370.         (context->srcW      != srcW      ||

  2371.          context->srcH      != srcH      ||

  2372.          context->srcFormat != srcFormat ||

  2373.          context->dstW      != dstW      ||

  2374.          context->dstH      != dstH      ||

  2375.          context->dstFormat != dstFormat ||

  2376.          context->flags     != flags     ||

  2377.          context->param[0]  != param[0]  ||

  2378.          context->param[1]  != param[1])) {

  2379. 

  2380.         av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);

  2381.         av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);

  2382.         av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);

  2383.         av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);

  2384.         sws_freeContext(context);

  2385.         context = NULL;

  2386.     }

  2387. 

  2388.     if (!context) {

  2389.         if (!(context = sws_alloc_context()))

  2390.             return NULL;

  2391.         context->srcW      = srcW;

  2392.         context->srcH      = srcH;

  2393.         context->srcFormat = srcFormat;

  2394.         context->dstW      = dstW;

  2395.         context->dstH      = dstH;

  2396.         context->dstFormat = dstFormat;

  2397.         context->flags     = flags;

  2398.         context->param[0]  = param[0];

  2399.         context->param[1]  = param[1];

  2400. 

  2401.         av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);

  2402.         av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);

  2403.         av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);

  2404.         av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);

  2405. 

  2406.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2407.             sws_freeContext(context);

  2408.             return NULL;

  2409.         }

  2410.     }

  2411.     return context;

  2412. }