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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_GBRP14LE]    = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  233. };

  234. 

  235. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  236. {

  237.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  238.            format_entries[pix_fmt].is_supported_in : 0;

  239. }

  240. 

  241. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  242. {

  243.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  244.            format_entries[pix_fmt].is_supported_out : 0;

  245. }

  246. 

  247. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  248. {

  249.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  250.            format_entries[pix_fmt].is_supported_endianness : 0;

  251. }

  252. 

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

  254.                              double dist)

  255. {

  256.     if (dist <= 1.0)

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

  258.     else

  259.         return getSplineCoeff(0.0,

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

  261.                                c + 3.0 * d,

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

  263.                               dist - 1.0);

  264. }

  265. 

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

  267. {

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

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

  270.     }

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

  272.     return pos >> chr_subsample;

  273. }

  274. 

  275. typedef struct {

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

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

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

  279. } ScaleAlgorithm;

  280. 

  281. static const ScaleAlgorithm scale_algorithms[] = {

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

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

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

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

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

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

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

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

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

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

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

  293. };

  294. 

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

  296.                               int *outFilterSize, int xInc, int srcW,

  297.                               int dstW, int filterAlign, int one,

  298.                               int flags, int cpu_flags,

  299.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  301. {

  302.     int i;

  303.     int filterSize;

  304.     int filter2Size;

  305.     int minFilterSize;

  306.     int64_t *filter    = NULL;

  307.     int64_t *filter2   = NULL;

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

  309.     int ret            = -1;

  310. 

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

  312. 

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

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

  315. 

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

  317.         int i;

  318.         filterSize = 1;

  319.         FF_ALLOCZ_ARRAY_OR_GOTO(NULL, filter,

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

  321. 

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

  323.             filter[i * filterSize] = fone;

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

  325.         }

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

  327.         int i;

  328.         int64_t xDstInSrc;

  329.         filterSize = 1;

  330.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  332. 

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

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

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

  336. 

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

  338.             filter[i]       = fone;

  339.             xDstInSrc      += xInc;

  340.         }

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

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

  343.         int i;

  344.         int64_t xDstInSrc;

  345.         filterSize = 2;

  346.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  348. 

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

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

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

  352.             int j;

  353. 

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

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

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

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

  358.                 if (coeff < 0)

  359.                     coeff = 0;

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

  361.                 xx++;

  362.             }

  363.             xDstInSrc += xInc;

  364.         }

  365.     } else {

  366.         int64_t xDstInSrc;

  367.         int sizeFactor = -1;

  368. 

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

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

  371.                 sizeFactor = scale_algorithms[i].size_factor;

  372.                 break;

  373.             }

  374.         }

  375.         if (flags & SWS_LANCZOS)

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

  377.         av_assert0(sizeFactor > 0);

  378. 

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

  380.             filterSize = 1 + sizeFactor;    // upscale

  381.         else

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

  383. 

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

  385.         filterSize = FFMAX(filterSize, 1);

  386. 

  387.         FF_ALLOC_ARRAY_OR_GOTO(NULL, filter,

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

  389. 

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

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

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

  393.             int j;

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

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

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

  397.                 double floatd;

  398.                 int64_t coeff;

  399. 

  400.                 if (xInc > 1 << 16)

  401.                     d = d * dstW / srcW;

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

  403. 

  404.                 if (flags & SWS_BICUBIC) {

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

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

  407. 

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

  409.                         coeff = 0.0;

  410.                     } else {

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

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

  413. 

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

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

  416.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  417.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  418.                         else

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

  420.                                       (6 * B + 30 * C) * dd  +

  421.                                     (-12 * B - 48 * C) * d   +

  422.                                       (8 * B + 24 * C) * (1 << 30);

  423.                     }

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

  425.                 }

  426. #if 0

  427.                 else if (flags & SWS_X) {

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

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

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

  431.                 }

  432. #endif

  433.                 else if (flags & SWS_X) {

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

  435.                     double c;

  436. 

  437.                     if (floatd < 1.0)

  438.                         c = cos(floatd * M_PI);

  439.                     else

  440.                         c = -1.0;

  441.                     if (c < 0.0)

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

  443.                     else

  444.                         c = pow(c, A);

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

  446.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  452.                     else

  453.                         coeff = 0.0;

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

  455.                 } else if (flags & SWS_GAUSS) {

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

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

  458.                 } else if (flags & SWS_SINC) {

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

  460.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  464.                     if (floatd > p)

  465.                         coeff = 0;

  466.                 } else if (flags & SWS_BILINEAR) {

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

  468.                     if (coeff < 0)

  469.                         coeff = 0;

  470.                     coeff *= fone >> 30;

  471.                 } else if (flags & SWS_SPLINE) {

  472.                     double p = -2.196152422706632;

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

  474.                 } else {

  475.                     av_assert0(0);

  476.                 }

  477. 

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

  479.                 xx++;

  480.             }

  481.             xDstInSrc += 2 * xInc;

  482.         }

  483.     }

  484. 

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

  486.      * av_free(filter);

  487.      */

  488.     av_assert0(filterSize > 0);

  489.     filter2Size = filterSize;

  490.     if (srcFilter)

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

  492.     if (dstFilter)

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

  494.     av_assert0(filter2Size > 0);

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

  496. 

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

  498.         int j, k;

  499. 

  500.         if (srcFilter) {

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

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

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

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

  505.             }

  506.         } else {

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

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

  509.         }

  510.         // FIXME dstFilter

  511. 

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

  513.     }

  514.     av_freep(&filter);

  515. 

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

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

  518.     minFilterSize = 0;

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

  520.         int min = filter2Size;

  521.         int j;

  522.         int64_t cutOff = 0.0;

  523. 

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

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

  526.             int k;

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

  528. 

  529.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  530.                 break;

  531. 

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

  533.              * filter otherwise */

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

  535.                 break;

  536. 

  537.             // move filter coefficients left

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

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

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

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

  542.         }

  543. 

  544.         cutOff = 0;

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

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

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

  548. 

  549.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  550.                 break;

  551.             min--;

  552.         }

  553. 

  554.         if (min > minFilterSize)

  555.             minFilterSize = min;

  556.     }

  557. 

  558.     if (PPC_ALTIVEC(cpu_flags)) {

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

  560.         if (minFilterSize < 5)

  561.             filterAlign = 4;

  562. 

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

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

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

  566.         if (minFilterSize < 3)

  567.             filterAlign = 1;

  568.     }

  569. 

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

  571.         // special case for unscaled vertical filtering

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

  573.             filterAlign = 1;

  574.     }

  575. 

  576.     av_assert0(minFilterSize > 0);

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

  578.     av_assert0(filterSize > 0);

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

  580.     if (!filter)

  581.         goto fail;

  582.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  584.         ret = RETCODE_USE_CASCADE;

  585.         goto fail;

  586.     }

  587.     *outFilterSize = filterSize;

  588. 

  589.     if (flags & SWS_PRINT_INFO)

  590.         av_log(NULL, AV_LOG_VERBOSE,

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

  592.                filter2Size, filterSize);

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

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

  595.         int j;

  596. 

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

  598.             if (j >= filter2Size)

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

  600.             else

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

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

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

  604.         }

  605.     }

  606. 

  607.     // FIXME try to align filterPos if possible

  608. 

  609.     // fix borders

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

  611.         int j;

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

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

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

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

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

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

  618.             }

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

  620.         }

  621. 

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

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

  624.             int64_t acc = 0;

  625. 

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

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

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

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

  630.                 }

  631.             }

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

  633.                 if (j < shift) {

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

  635.                 } else {

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

  637.                 }

  638.             }

  639. 

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

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

  642.         }

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

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

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

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

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

  648.             }

  649.         }

  650.     }

  651. 

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

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

  654.     FF_ALLOCZ_ARRAY_OR_GOTO(NULL, *outFilter,

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

  656. 

  657.     /* normalize & store in outFilter */

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

  659.         int j;

  660.         int64_t error = 0;

  661.         int64_t sum   = 0;

  662. 

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

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

  665.         }

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

  667.         if (!sum) {

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

  669.             sum = 1;

  670.         }

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

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

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

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

  675.             error                                  = v - intV * sum;

  676.         }

  677.     }

  678. 

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

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

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

  682.                                                       * read over the end */

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

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

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

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

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

  688.     }

  689. 

  690.     ret = 0;

  691. 

  692. fail:

  693.     if(ret < 0)

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

  695.     av_free(filter);

  696.     av_free(filter2);

  697.     return ret;

  698. }

  699. 

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

  701. {

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

  703.     int64_t vr =  table[0];

  704.     int64_t ub =  table[1];

  705.     int64_t ug = -table[2];

  706.     int64_t vg = -table[3];

  707.     int64_t ONE = 65536;

  708.     int64_t cy = ONE;

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

  710.     int i;

  711.     static const int8_t map[] = {

  712.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  713.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  714.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

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

  716.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  717.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  718.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

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

  720.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  721.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  722.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

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

  724.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  725.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  726.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  727.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  728.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  729.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  730.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  731.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  732.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  733.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  734.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  735.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  736.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  737.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  738.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  739.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  740.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  741.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  742.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  743.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  747.     };

  748. 

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

  750. 

  751.     if (!dstRange) {

  752.         cy = cy * 255 / 219;

  753.     } else {

  754.         vr = vr * 224 / 255;

  755.         ub = ub * 224 / 255;

  756.         ug = ug * 224 / 255;

  757.         vg = vg * 224 / 255;

  758.     }

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

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

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

  762. 

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

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

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

  766. 

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

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

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

  770. 

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

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

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

  774. 

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

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

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

  778. 

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

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

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

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

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

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

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

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

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

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

  789.     }

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

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

  792. }

  793. 

  794. static void fill_xyztables(struct SwsContext *c)

  795. {

  796.     int i;

  797.     double xyzgamma = XYZ_GAMMA;

  798.     double rgbgamma = 1.0 / RGB_GAMMA;

  799.     double xyzgammainv = 1.0 / XYZ_GAMMA;

  800.     double rgbgammainv = RGB_GAMMA;

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

  802.         {13270, -6295, -2041},

  803.         {-3969,  7682,   170},

  804.         {  228,  -835,  4329} };

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

  806.         {1689, 1464,  739},

  807.         { 871, 2929,  296},

  808.         {  79,  488, 3891} };

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

  810. 

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

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

  813.     c->xyzgamma = xyzgamma_tab;

  814.     c->rgbgamma = rgbgamma_tab;

  815.     c->xyzgammainv = xyzgammainv_tab;

  816.     c->rgbgammainv = rgbgammainv_tab;

  817. 

  818.     if (rgbgamma_tab[4095])

  819.         return;

  820. 

  821.     /* set gamma vectors */

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

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

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

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

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

  827.     }

  828. }

  829. 

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

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

  832.                              int brightness, int contrast, int saturation)

  833. {

  834.     const AVPixFmtDescriptor *desc_dst;

  835.     const AVPixFmtDescriptor *desc_src;

  836.     int need_reinit = 0;

  837. 

  838.     handle_formats(c);

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

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

  841. 

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

  843.         dstRange = 0;

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

  845.         srcRange = 0;

  846. 

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

  848.         c->dstRange != dstRange ||

  849.         c->brightness != brightness ||

  850.         c->contrast   != contrast ||

  851.         c->saturation != saturation ||

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

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

  854.     )

  855.         need_reinit = 1;

  856. 

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

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

  859. 

  860. 

  861. 

  862.     c->brightness = brightness;

  863.     c->contrast   = contrast;

  864.     c->saturation = saturation;

  865.     c->srcRange   = srcRange;

  866.     c->dstRange   = dstRange;

  867. 

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

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

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

  871.         ff_sws_init_range_convert(c);

  872. 

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

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

  875. 

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

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

  878. 

  879.     if (!need_reinit)

  880.         return 0;

  881. 

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

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

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

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

  886.             enum AVPixelFormat tmp_format;

  887.             int tmp_width, tmp_height;

  888.             int srcW = c->srcW;

  889.             int srcH = c->srcH;

  890.             int dstW = c->dstW;

  891.             int dstH = c->dstH;

  892.             int ret;

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

  894. 

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

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

  897.                     tmp_format = AV_PIX_FMT_BGRA64;

  898.                 } else {

  899.                     tmp_format = AV_PIX_FMT_BGR48;

  900.                 }

  901.             } else {

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

  903.                     tmp_format = AV_PIX_FMT_BGRA;

  904.                 } else {

  905.                     tmp_format = AV_PIX_FMT_BGR24;

  906.                 }

  907.             }

  908. 

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

  910.                 tmp_width  = dstW;

  911.                 tmp_height = dstH;

  912.             } else {

  913.                 tmp_width  = srcW;

  914.                 tmp_height = srcH;

  915.             }

  916. 

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

  918.                                 tmp_width, tmp_height, tmp_format, 64);

  919.             if (ret < 0)

  920.                 return ret;

  921. 

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

  923.                                                         tmp_width, tmp_height, tmp_format,

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

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

  926.                 return -1;

  927. 

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

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

  930.             if (ret < 0)

  931.                 return ret;

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

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

  934.                                      srcRange, table, dstRange,

  935.                                      brightness, contrast, saturation);

  936. 

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

  938.                                                     dstW, dstH, c->dstFormat,

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

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

  941.                 return -1;

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

  943.                                      srcRange, table, dstRange,

  944.                                      0, 1 << 16, 1 << 16);

  945.             return 0;

  946.         }

  947.         return -1;

  948.     }

  949. 

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

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

  952.                                  contrast, saturation);

  953.         // FIXME factorize

  954. 

  955.         if (ARCH_PPC)

  956.             ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  957.                                        contrast, saturation);

  958.     }

  959. 

  960.     fill_rgb2yuv_table(c, table, dstRange);

  961. 

  962.     return 0;

  963. }

  964. 

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

  966.                              int *srcRange, int **table, int *dstRange,

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

  968. {

  969.     if (!c )

  970.         return -1;

  971. 

  972.     *inv_table  = c->srcColorspaceTable;

  973.     *table      = c->dstColorspaceTable;

  974.     *srcRange   = c->srcRange;

  975.     *dstRange   = c->dstRange;

  976.     *brightness = c->brightness;

  977.     *contrast   = c->contrast;

  978.     *saturation = c->saturation;

  979. 

  980.     return 0;

  981. }

  982. 

  983. static int handle_jpeg(enum AVPixelFormat *format)

  984. {

  985.     switch (*format) {

  986.     case AV_PIX_FMT_YUVJ420P:

  987.         *format = AV_PIX_FMT_YUV420P;

  988.         return 1;

  989.     case AV_PIX_FMT_YUVJ411P:

  990.         *format = AV_PIX_FMT_YUV411P;

  991.         return 1;

  992.     case AV_PIX_FMT_YUVJ422P:

  993.         *format = AV_PIX_FMT_YUV422P;

  994.         return 1;

  995.     case AV_PIX_FMT_YUVJ444P:

  996.         *format = AV_PIX_FMT_YUV444P;

  997.         return 1;

  998.     case AV_PIX_FMT_YUVJ440P:

  999.         *format = AV_PIX_FMT_YUV440P;

  1000.         return 1;

  1001.     case AV_PIX_FMT_GRAY8:

  1002.     case AV_PIX_FMT_YA8:

  1003.     case AV_PIX_FMT_GRAY16LE:

  1004.     case AV_PIX_FMT_GRAY16BE:

  1005.     case AV_PIX_FMT_YA16BE:

  1006.     case AV_PIX_FMT_YA16LE:

  1007.         return 1;

  1008.     default:

  1009.         return 0;

  1010.     }

  1011. }

  1012. 

  1013. static int handle_0alpha(enum AVPixelFormat *format)

  1014. {

  1015.     switch (*format) {

  1016.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1017.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1018.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1019.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1020.     default:                                          return 0;

  1021.     }

  1022. }

  1023. 

  1024. static int handle_xyz(enum AVPixelFormat *format)

  1025. {

  1026.     switch (*format) {

  1027.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1028.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1029.     default:                                                return 0;

  1030.     }

  1031. }

  1032. 

  1033. static void handle_formats(SwsContext *c)

  1034. {

  1035.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1036.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1037.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1038.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1039.     if (c->srcXYZ || c->dstXYZ)

  1040.         fill_xyztables(c);

  1041. }

  1042. 

  1043. SwsContext *sws_alloc_context(void)

  1044. {

  1045.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1046. 

  1047.     av_assert0(offsetof(SwsContext, redDither) + DITHER32_INT == offsetof(SwsContext, dither32));

  1048. 

  1049.     if (c) {

  1050.         c->av_class = &ff_sws_context_class;

  1051.         av_opt_set_defaults(c);

  1052.     }

  1053. 

  1054.     return c;

  1055. }

  1056. 

  1057. static uint16_t * alloc_gamma_tbl(double e)

  1058. {

  1059.     int i = 0;

  1060.     uint16_t * tbl;

  1061.     tbl = (uint16_t*)av_malloc(sizeof(uint16_t) * 1 << 16);

  1062.     if (!tbl)

  1063.         return NULL;

  1064. 

  1065.     for (i = 0; i < 65536; ++i) {

  1066.         tbl[i] = pow(i / 65535.0, e) * 65535.0;

  1067.     }

  1068.     return tbl;

  1069. }

  1070. 

  1071. static enum AVPixelFormat alphaless_fmt(enum AVPixelFormat fmt)

  1072. {

  1073.     switch(fmt) {

  1074.     case AV_PIX_FMT_ARGB:       return AV_PIX_FMT_RGB24;

  1075.     case AV_PIX_FMT_RGBA:       return AV_PIX_FMT_RGB24;

  1076.     case AV_PIX_FMT_ABGR:       return AV_PIX_FMT_BGR24;

  1077.     case AV_PIX_FMT_BGRA:       return AV_PIX_FMT_BGR24;

  1078.     case AV_PIX_FMT_YA8:        return AV_PIX_FMT_GRAY8;

  1079. 

  1080.     case AV_PIX_FMT_YUVA420P:   return AV_PIX_FMT_YUV420P;

  1081.     case AV_PIX_FMT_YUVA422P:   return AV_PIX_FMT_YUV422P;

  1082.     case AV_PIX_FMT_YUVA444P:           return AV_PIX_FMT_YUV444P;

  1083. 

  1084.     case AV_PIX_FMT_GBRAP:              return AV_PIX_FMT_GBRP;

  1085. 

  1086.     case AV_PIX_FMT_GBRAP16LE:          return AV_PIX_FMT_GBRP16;

  1087.     case AV_PIX_FMT_GBRAP16BE:          return AV_PIX_FMT_GBRP16;

  1088. 

  1089.     case AV_PIX_FMT_RGBA64LE:   return AV_PIX_FMT_RGB48;

  1090.     case AV_PIX_FMT_RGBA64BE:   return AV_PIX_FMT_RGB48;

  1091.     case AV_PIX_FMT_BGRA64LE:   return AV_PIX_FMT_BGR48;

  1092.     case AV_PIX_FMT_BGRA64BE:   return AV_PIX_FMT_BGR48;

  1093. 

  1094.     case AV_PIX_FMT_YA16BE:             return AV_PIX_FMT_GRAY16;

  1095.     case AV_PIX_FMT_YA16LE:             return AV_PIX_FMT_GRAY16;

  1096. 

  1097.     case AV_PIX_FMT_YUVA420P9BE:        return AV_PIX_FMT_YUV420P9;

  1098.     case AV_PIX_FMT_YUVA422P9BE:        return AV_PIX_FMT_YUV422P9;

  1099.     case AV_PIX_FMT_YUVA444P9BE:        return AV_PIX_FMT_YUV444P9;

  1100.     case AV_PIX_FMT_YUVA420P9LE:        return AV_PIX_FMT_YUV420P9;

  1101.     case AV_PIX_FMT_YUVA422P9LE:        return AV_PIX_FMT_YUV422P9;

  1102.     case AV_PIX_FMT_YUVA444P9LE:        return AV_PIX_FMT_YUV444P9;

  1103.     case AV_PIX_FMT_YUVA420P10BE:       return AV_PIX_FMT_YUV420P10;

  1104.     case AV_PIX_FMT_YUVA422P10BE:       return AV_PIX_FMT_YUV422P10;

  1105.     case AV_PIX_FMT_YUVA444P10BE:       return AV_PIX_FMT_YUV444P10;

  1106.     case AV_PIX_FMT_YUVA420P10LE:       return AV_PIX_FMT_YUV420P10;

  1107.     case AV_PIX_FMT_YUVA422P10LE:       return AV_PIX_FMT_YUV422P10;

  1108.     case AV_PIX_FMT_YUVA444P10LE:       return AV_PIX_FMT_YUV444P10;

  1109.     case AV_PIX_FMT_YUVA420P16BE:       return AV_PIX_FMT_YUV420P16;

  1110.     case AV_PIX_FMT_YUVA422P16BE:       return AV_PIX_FMT_YUV422P16;

  1111.     case AV_PIX_FMT_YUVA444P16BE:       return AV_PIX_FMT_YUV444P16;

  1112.     case AV_PIX_FMT_YUVA420P16LE:       return AV_PIX_FMT_YUV420P16;

  1113.     case AV_PIX_FMT_YUVA422P16LE:       return AV_PIX_FMT_YUV422P16;

  1114.     case AV_PIX_FMT_YUVA444P16LE:       return AV_PIX_FMT_YUV444P16;

  1115. 

  1116. //     case AV_PIX_FMT_AYUV64LE:

  1117. //     case AV_PIX_FMT_AYUV64BE:

  1118. //     case AV_PIX_FMT_PAL8:

  1119.     default: return AV_PIX_FMT_NONE;

  1120.     }

  1121. }

  1122. 

  1123. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1124.                              SwsFilter *dstFilter)

  1125. {

  1126.     int i, j;

  1127.     int usesVFilter, usesHFilter;

  1128.     int unscaled;

  1129.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1130.     int srcW              = c->srcW;

  1131.     int srcH              = c->srcH;

  1132.     int dstW              = c->dstW;

  1133.     int dstH              = c->dstH;

  1134.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1135.     int flags, cpu_flags;

  1136.     enum AVPixelFormat srcFormat = c->srcFormat;

  1137.     enum AVPixelFormat dstFormat = c->dstFormat;

  1138.     const AVPixFmtDescriptor *desc_src;

  1139.     const AVPixFmtDescriptor *desc_dst;

  1140.     int ret = 0;

  1141.     enum AVPixelFormat tmpFmt;

  1142. 

  1143.     cpu_flags = av_get_cpu_flags();

  1144.     flags     = c->flags;

  1145.     emms_c();

  1146.     if (!rgb15to16)

  1147.         ff_sws_rgb2rgb_init();

  1148. 

  1149.     unscaled = (srcW == dstW && srcH == dstH);

  1150. 

  1151.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1152.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1153. 

  1154.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1155.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1156. 

  1157.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1158.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1159.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1160.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1161. 

  1162.     handle_formats(c);

  1163.     srcFormat = c->srcFormat;

  1164.     dstFormat = c->dstFormat;

  1165.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1166.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1167. 

  1168.     // If the source has no alpha then disable alpha blendaway

  1169.     if (c->src0Alpha)

  1170.         c->alphablend = SWS_ALPHA_BLEND_NONE;

  1171. 

  1172.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1173.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1174.     if (!sws_isSupportedInput(srcFormat)) {

  1175.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1176.                av_get_pix_fmt_name(srcFormat));

  1177.         return AVERROR(EINVAL);

  1178.     }

  1179.     if (!sws_isSupportedOutput(dstFormat)) {

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

  1181.                av_get_pix_fmt_name(dstFormat));

  1182.         return AVERROR(EINVAL);

  1183.     }

  1184.     }

  1185.     av_assert2(desc_src && desc_dst);

  1186. 

  1187.     i = flags & (SWS_POINT         |

  1188.                  SWS_AREA          |

  1189.                  SWS_BILINEAR      |

  1190.                  SWS_FAST_BILINEAR |

  1191.                  SWS_BICUBIC       |

  1192.                  SWS_X             |

  1193.                  SWS_GAUSS         |

  1194.                  SWS_LANCZOS       |

  1195.                  SWS_SINC          |

  1196.                  SWS_SPLINE        |

  1197.                  SWS_BICUBLIN);

  1198. 

  1199.     /* provide a default scaler if not set by caller */

  1200.     if (!i) {

  1201.         if (dstW < srcW && dstH < srcH)

  1202.             flags |= SWS_BICUBIC;

  1203.         else if (dstW > srcW && dstH > srcH)

  1204.             flags |= SWS_BICUBIC;

  1205.         else

  1206.             flags |= SWS_BICUBIC;

  1207.         c->flags = flags;

  1208.     } else if (i & (i - 1)) {

  1209.         av_log(c, AV_LOG_ERROR,

  1210.                "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1211.         return AVERROR(EINVAL);

  1212.     }

  1213.     /* sanity check */

  1214.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1215.         /* FIXME check if these are enough and try to lower them after

  1216.          * fixing the relevant parts of the code */

  1217.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1218.                srcW, srcH, dstW, dstH);

  1219.         return AVERROR(EINVAL);

  1220.     }

  1221.     if (flags & SWS_FAST_BILINEAR) {

  1222.         if (srcW < 8 || dstW < 8) {

  1223.             flags ^= SWS_FAST_BILINEAR | SWS_BILINEAR;

  1224.             c->flags = flags;

  1225.         }

  1226.     }

  1227. 

  1228.     if (!dstFilter)

  1229.         dstFilter = &dummyFilter;

  1230.     if (!srcFilter)

  1231.         srcFilter = &dummyFilter;

  1232. 

  1233.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1234.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1235.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1236.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1237.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1238. 

  1239.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1240.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1241.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1242.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1243.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1244.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1245.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1246.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1247. 

  1248.     av_pix_fmt_get_chroma_sub_sample(srcFormat, &c->chrSrcHSubSample, &c->chrSrcVSubSample);

  1249.     av_pix_fmt_get_chroma_sub_sample(dstFormat, &c->chrDstHSubSample, &c->chrDstVSubSample);

  1250. 

  1251.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1252.         if (dstW&1) {

  1253.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1254.             flags |= SWS_FULL_CHR_H_INT;

  1255.             c->flags = flags;

  1256.         }

  1257. 

  1258.         if (   c->chrSrcHSubSample == 0

  1259.             && c->chrSrcVSubSample == 0

  1260.             && c->dither != SWS_DITHER_BAYER //SWS_FULL_CHR_H_INT is currently not supported with SWS_DITHER_BAYER

  1261.             && !(c->flags & SWS_FAST_BILINEAR)

  1262.         ) {

  1263.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to input having non subsampled chroma\n");

  1264.             flags |= SWS_FULL_CHR_H_INT;

  1265.             c->flags = flags;

  1266.         }

  1267.     }

  1268. 

  1269.     if (c->dither == SWS_DITHER_AUTO) {

  1270.         if (flags & SWS_ERROR_DIFFUSION)

  1271.             c->dither = SWS_DITHER_ED;

  1272.     }

  1273. 

  1274.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1275.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1276.        dstFormat == AV_PIX_FMT_BGR8 ||

  1277.        dstFormat == AV_PIX_FMT_RGB8) {

  1278.         if (c->dither == SWS_DITHER_AUTO)

  1279.             c->dither = (flags & SWS_FULL_CHR_H_INT) ? SWS_DITHER_ED : SWS_DITHER_BAYER;

  1280.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1281.             if (c->dither == SWS_DITHER_ED || c->dither == SWS_DITHER_A_DITHER || c->dither == SWS_DITHER_X_DITHER) {

  1282.                 av_log(c, AV_LOG_DEBUG,

  1283.                     "Desired dithering only supported in full chroma interpolation for destination format '%s'\n",

  1284.                     av_get_pix_fmt_name(dstFormat));

  1285.                 flags   |= SWS_FULL_CHR_H_INT;

  1286.                 c->flags = flags;

  1287.             }

  1288.         }

  1289.         if (flags & SWS_FULL_CHR_H_INT) {

  1290.             if (c->dither == SWS_DITHER_BAYER) {

  1291.                 av_log(c, AV_LOG_DEBUG,

  1292.                     "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1293.                     av_get_pix_fmt_name(dstFormat));

  1294.                 c->dither = SWS_DITHER_ED;

  1295.             }

  1296.         }

  1297.     }

  1298.     if (isPlanarRGB(dstFormat)) {

  1299.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1300.             av_log(c, AV_LOG_DEBUG,

  1301.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1302.                    av_get_pix_fmt_name(dstFormat));

  1303.             flags   |= SWS_FULL_CHR_H_INT;

  1304.             c->flags = flags;

  1305.         }

  1306.     }

  1307. 

  1308.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1309.      * chroma interpolation */

  1310.     if (flags & SWS_FULL_CHR_H_INT &&

  1311.         isAnyRGB(dstFormat)        &&

  1312.         !isPlanarRGB(dstFormat)    &&

  1313.         dstFormat != AV_PIX_FMT_RGBA64LE &&

  1314.         dstFormat != AV_PIX_FMT_RGBA64BE &&

  1315.         dstFormat != AV_PIX_FMT_BGRA64LE &&

  1316.         dstFormat != AV_PIX_FMT_BGRA64BE &&

  1317.         dstFormat != AV_PIX_FMT_RGB48LE &&

  1318.         dstFormat != AV_PIX_FMT_RGB48BE &&

  1319.         dstFormat != AV_PIX_FMT_BGR48LE &&

  1320.         dstFormat != AV_PIX_FMT_BGR48BE &&

  1321.         dstFormat != AV_PIX_FMT_RGBA  &&

  1322.         dstFormat != AV_PIX_FMT_ARGB  &&

  1323.         dstFormat != AV_PIX_FMT_BGRA  &&

  1324.         dstFormat != AV_PIX_FMT_ABGR  &&

  1325.         dstFormat != AV_PIX_FMT_RGB24 &&

  1326.         dstFormat != AV_PIX_FMT_BGR24 &&

  1327.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1328.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1329.         dstFormat != AV_PIX_FMT_BGR8 &&

  1330.         dstFormat != AV_PIX_FMT_RGB8

  1331.     ) {

  1332.         av_log(c, AV_LOG_WARNING,

  1333.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1334.                av_get_pix_fmt_name(dstFormat));

  1335.         flags   &= ~SWS_FULL_CHR_H_INT;

  1336.         c->flags = flags;

  1337.     }

  1338.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1339.         c->chrDstHSubSample = 1;

  1340. 

  1341.     // drop some chroma lines if the user wants it

  1342.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1343.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1344.     c->chrSrcVSubSample += c->vChrDrop;

  1345. 

  1346.     /* drop every other pixel for chroma calculation unless user

  1347.      * wants full chroma */

  1348.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1349.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1350.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1351.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1352.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1353.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1354.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1355.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1356.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1357.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1358.          (flags & SWS_FAST_BILINEAR)))

  1359.         c->chrSrcHSubSample = 1;

  1360. 

  1361.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1362.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1363.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1364.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1365.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1366. 

  1367.     FF_ALLOCZ_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1368. 

  1369.     c->srcBpc = desc_src->comp[0].depth;

  1370.     if (c->srcBpc < 8)

  1371.         c->srcBpc = 8;

  1372.     c->dstBpc = desc_dst->comp[0].depth;

  1373.     if (c->dstBpc < 8)

  1374.         c->dstBpc = 8;

  1375.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1376.         c->srcBpc = 16;

  1377.     if (c->dstBpc == 16)

  1378.         dst_stride <<= 1;

  1379. 

  1380.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1381.         c->canMMXEXTBeUsed = dstW >= srcW && (dstW & 31) == 0 &&

  1382.                              c->chrDstW >= c->chrSrcW &&

  1383.                              (srcW & 15) == 0;

  1384.         if (!c->canMMXEXTBeUsed && dstW >= srcW && c->chrDstW >= c->chrSrcW && (srcW & 15) == 0

  1385. 

  1386.             && (flags & SWS_FAST_BILINEAR)) {

  1387.             if (flags & SWS_PRINT_INFO)

  1388.                 av_log(c, AV_LOG_INFO,

  1389.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1390.         }

  1391.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1392.             c->canMMXEXTBeUsed = 0;

  1393.     } else

  1394.         c->canMMXEXTBeUsed = 0;

  1395. 

  1396.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1397.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1398. 

  1399.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1400.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1401.      * correct scaling.

  1402.      * n-2 is the last chrominance sample available.

  1403.      * This is not perfect, but no one should notice the difference, the more

  1404.      * correct variant would be like the vertical one, but that would require

  1405.      * some special code for the first and last pixel */

  1406.     if (flags & SWS_FAST_BILINEAR) {

  1407.         if (c->canMMXEXTBeUsed) {

  1408.             c->lumXInc += 20;

  1409.             c->chrXInc += 20;

  1410.         }

  1411.         // we don't use the x86 asm scaler if MMX is available

  1412.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1413.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1414.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1415.         }

  1416.     }

  1417. 

  1418.     // hardcoded for now

  1419.     c->gamma_value = 2.2;

  1420.     tmpFmt = AV_PIX_FMT_RGBA64LE;

  1421. 

  1422. 

  1423.     if (!unscaled && c->gamma_flag && (srcFormat != tmpFmt || dstFormat != tmpFmt)) {

  1424.         SwsContext *c2;

  1425.         c->cascaded_context[0] = NULL;

  1426. 

  1427.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1428.                             srcW, srcH, tmpFmt, 64);

  1429.         if (ret < 0)

  1430.             return ret;

  1431. 

  1432.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1433.                                                 srcW, srcH, tmpFmt,

  1434.                                                 flags, NULL, NULL, c->param);

  1435.         if (!c->cascaded_context[0]) {

  1436.             return -1;

  1437.         }

  1438. 

  1439.         c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFmt,

  1440.                                                 dstW, dstH, tmpFmt,

  1441.                                                 flags, srcFilter, dstFilter, c->param);

  1442. 

  1443.         if (!c->cascaded_context[1])

  1444.             return -1;

  1445. 

  1446.         c2 = c->cascaded_context[1];

  1447.         c2->is_internal_gamma = 1;

  1448.         c2->gamma     = alloc_gamma_tbl(    c->gamma_value);

  1449.         c2->inv_gamma = alloc_gamma_tbl(1.f/c->gamma_value);

  1450.         if (!c2->gamma || !c2->inv_gamma)

  1451.             return AVERROR(ENOMEM);

  1452. 

  1453.         // is_internal_flag is set after creating the context

  1454.         // to properly create the gamma convert FilterDescriptor

  1455.         // we have to re-initialize it

  1456.         ff_free_filters(c2);

  1457.         if (ff_init_filters(c2) < 0) {

  1458.             sws_freeContext(c2);

  1459.             return -1;

  1460.         }

  1461. 

  1462.         c->cascaded_context[2] = NULL;

  1463.         if (dstFormat != tmpFmt) {

  1464.             ret = av_image_alloc(c->cascaded1_tmp, c->cascaded1_tmpStride,

  1465.                                 dstW, dstH, tmpFmt, 64);

  1466.             if (ret < 0)

  1467.                 return ret;

  1468. 

  1469.             c->cascaded_context[2] = sws_getContext(dstW, dstH, tmpFmt,

  1470.                                                 dstW, dstH, dstFormat,

  1471.                                                 flags, NULL, NULL, c->param);

  1472.             if (!c->cascaded_context[2])

  1473.                 return -1;

  1474.         }

  1475.         return 0;

  1476.     }

  1477. 

  1478.     if (isBayer(srcFormat)) {

  1479.         if (!unscaled ||

  1480.             (dstFormat != AV_PIX_FMT_RGB24 && dstFormat != AV_PIX_FMT_YUV420P)) {

  1481.             enum AVPixelFormat tmpFormat = AV_PIX_FMT_RGB24;

  1482. 

  1483.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1484.                                 srcW, srcH, tmpFormat, 64);

  1485.             if (ret < 0)

  1486.                 return ret;

  1487. 

  1488.             c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1489.                                                     srcW, srcH, tmpFormat,

  1490.                                                     flags, srcFilter, NULL, c->param);

  1491.             if (!c->cascaded_context[0])

  1492.                 return -1;

  1493. 

  1494.             c->cascaded_context[1] = sws_getContext(srcW, srcH, tmpFormat,

  1495.                                                     dstW, dstH, dstFormat,

  1496.                                                     flags, NULL, dstFilter, c->param);

  1497.             if (!c->cascaded_context[1])

  1498.                 return -1;

  1499.             return 0;

  1500.         }

  1501.     }

  1502. 

  1503.     if (CONFIG_SWSCALE_ALPHA && isALPHA(srcFormat) && !isALPHA(dstFormat)) {

  1504.         enum AVPixelFormat tmpFormat = alphaless_fmt(srcFormat);

  1505. 

  1506.         if (tmpFormat != AV_PIX_FMT_NONE && c->alphablend != SWS_ALPHA_BLEND_NONE)

  1507.         if (!unscaled ||

  1508.             dstFormat != tmpFormat ||

  1509.             usesHFilter || usesVFilter ||

  1510.             c->srcRange != c->dstRange

  1511.         ) {

  1512.             c->cascaded_mainindex = 1;

  1513.             ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1514.                                 srcW, srcH, tmpFormat, 64);

  1515.             if (ret < 0)

  1516.                 return ret;

  1517. 

  1518.             c->cascaded_context[0] = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1519.                                                         srcW, srcH, tmpFormat,

  1520.                                                         flags, c->param);

  1521.             if (!c->cascaded_context[0])

  1522.                 return -1;

  1523.             c->cascaded_context[0]->alphablend = c->alphablend;

  1524.             ret = sws_init_context(c->cascaded_context[0], NULL , NULL);

  1525.             if (ret < 0)

  1526.                 return ret;

  1527. 

  1528.             c->cascaded_context[1] = sws_alloc_set_opts(srcW, srcH, tmpFormat,

  1529.                                                         dstW, dstH, dstFormat,

  1530.                                                         flags, c->param);

  1531.             if (!c->cascaded_context[1])

  1532.                 return -1;

  1533. 

  1534.             c->cascaded_context[1]->srcRange = c->srcRange;

  1535.             c->cascaded_context[1]->dstRange = c->dstRange;

  1536.             ret = sws_init_context(c->cascaded_context[1], srcFilter , dstFilter);

  1537.             if (ret < 0)

  1538.                 return ret;

  1539. 

  1540.             return 0;

  1541.         }

  1542.     }

  1543. 

  1544. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1545. 

  1546.     /* precalculate horizontal scaler filter coefficients */

  1547.     {

  1548. #if HAVE_MMXEXT_INLINE

  1549. // can't downscale !!!

  1550.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1551.             c->lumMmxextFilterCodeSize = ff_init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1552.                                                              NULL, NULL, 8);

  1553.             c->chrMmxextFilterCodeSize = ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1554.                                                              NULL, NULL, NULL, 4);

  1555. 

  1556. #if USE_MMAP

  1557.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1558.                                           PROT_READ | PROT_WRITE,

  1559.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1560.                                           -1, 0);

  1561.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1562.                                           PROT_READ | PROT_WRITE,

  1563.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1564.                                           -1, 0);

  1565. #elif HAVE_VIRTUALALLOC

  1566.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1567.                                                   c->lumMmxextFilterCodeSize,

  1568.                                                   MEM_COMMIT,

  1569.                                                   PAGE_EXECUTE_READWRITE);

  1570.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1571.                                                   c->chrMmxextFilterCodeSize,

  1572.                                                   MEM_COMMIT,

  1573.                                                   PAGE_EXECUTE_READWRITE);

  1574. #else

  1575.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1576.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1577. #endif

  1578. 

  1579. #ifdef MAP_ANONYMOUS

  1580.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1581. #else

  1582.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1583. #endif

  1584.             {

  1585.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1586.                 return AVERROR(ENOMEM);

  1587.             }

  1588. 

  1589.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1590.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1591.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1592.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1593. 

  1594.             ff_init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1595.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1596.             ff_init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1597.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1598. 

  1599. #if USE_MMAP

  1600.             if (   mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1

  1601.                 || mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ) == -1) {

  1602.                 av_log(c, AV_LOG_ERROR, "mprotect failed, cannot use fast bilinear scaler\n");

  1603.                 goto fail;

  1604.             }

  1605. #endif

  1606.         } else

  1607. #endif /* HAVE_MMXEXT_INLINE */

  1608.         {

  1609.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1610.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1611. 

  1612.             if ((ret = initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1613.                            &c->hLumFilterSize, c->lumXInc,

  1614.                            srcW, dstW, filterAlign, 1 << 14,

  1615.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1616.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1617.                            c->param,

  1618.                            get_local_pos(c, 0, 0, 0),

  1619.                            get_local_pos(c, 0, 0, 0))) < 0)

  1620.                 goto fail;

  1621.             if ((ret = initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1622.                            &c->hChrFilterSize, c->chrXInc,

  1623.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

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

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

  1626.                            c->param,

  1627.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1628.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0))) < 0)

  1629.                 goto fail;

  1630.         }

  1631.     } // initialize horizontal stuff

  1632. 

  1633.     /* precalculate vertical scaler filter coefficients */

  1634.     {

  1635.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1636.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1637. 

  1638.         if ((ret = initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1639.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1640.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1641.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1642.                        c->param,

  1643.                        get_local_pos(c, 0, 0, 1),

  1644.                        get_local_pos(c, 0, 0, 1))) < 0)

  1645.             goto fail;

  1646.         if ((ret = initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1647.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1648.                        filterAlign, (1 << 12),

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

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

  1651.                        c->param,

  1652.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1653.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1))) < 0)

  1654. 

  1655.             goto fail;

  1656. 

  1657. #if HAVE_ALTIVEC

  1658.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1659.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1660. 

  1661.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1662.             int j;

  1663.             short *p = (short *)&c->vYCoeffsBank[i];

  1664.             for (j = 0; j < 8; j++)

  1665.                 p[j] = c->vLumFilter[i];

  1666.         }

  1667. 

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

  1669.             int j;

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

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

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

  1673.         }

  1674. #endif

  1675.     }

  1676. 

  1677.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1678.     c->vLumBufSize = c->vLumFilterSize;

  1679.     c->vChrBufSize = c->vChrFilterSize;

  1680.     for (i = 0; i < dstH; i++) {

  1681.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1682.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1683.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1684.                                << c->chrSrcVSubSample));

  1685. 

  1686.         nextSlice >>= c->chrSrcVSubSample;

  1687.         nextSlice <<= c->chrSrcVSubSample;

  1688.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1689.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1690.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1691.             (nextSlice >> c->chrSrcVSubSample))

  1692.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1693.                              c->vChrFilterPos[chrI];

  1694.     }

  1695. 

  1696.     for (i = 0; i < 4; i++)

  1697.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1698. 

  1699.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1700.      * need to allocate several megabytes to handle all possible cases) */

  1701.     FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1702.     FF_ALLOCZ_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1703.     FF_ALLOCZ_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1704.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1705.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1706.     /* Note we need at least one pixel more at the end because of the MMX code

  1707.      * (just in case someone wants to replace the 4000/8000). */

  1708.     /* align at 16 bytes for AltiVec */

  1709.     for (i = 0; i < c->vLumBufSize; i++) {

  1710.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1711.                           dst_stride + 16, fail);

  1712.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1713.     }

  1714.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1715.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1716.     c->uv_offx2 = dst_stride + 16;

  1717.     for (i = 0; i < c->vChrBufSize; i++) {

  1718.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1719.                          dst_stride * 2 + 32, fail);

  1720.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1721.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1722.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1723.     }

  1724.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1725.         for (i = 0; i < c->vLumBufSize; i++) {

  1726.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1727.                               dst_stride + 16, fail);

  1728.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1729.         }

  1730. 

  1731.     // try to avoid drawing green stuff between the right end and the stride end

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

  1733.         if(desc_dst->comp[0].depth == 16){

  1734.             av_assert0(c->dstBpc > 14);

  1735.             for(j=0; j<dst_stride/2+1; j++)

  1736.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1737.         } else

  1738.             for(j=0; j<dst_stride+1; j++)

  1739.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1740. 

  1741.     av_assert0(c->chrDstH <= dstH);

  1742. 

  1743.     if (flags & SWS_PRINT_INFO) {

  1744.         const char *scaler = NULL, *cpucaps;

  1745. 

  1746.         for (i = 0; i < FF_ARRAY_ELEMS(scale_algorithms); i++) {

  1747.             if (flags & scale_algorithms[i].flag) {

  1748.                 scaler = scale_algorithms[i].description;

  1749.                 break;

  1750.             }

  1751.         }

  1752.         if (!scaler)

  1753.             scaler =  "ehh flags invalid?!";

  1754.         av_log(c, AV_LOG_INFO, "%s scaler, from %s to %s%s ",

  1755.                scaler,

  1756.                av_get_pix_fmt_name(srcFormat),

  1757. #ifdef DITHER1XBPP

  1758.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1759.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1760.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1761.                                                              "dithered " : "",

  1762. #else

  1763.                "",

  1764. #endif

  1765.                av_get_pix_fmt_name(dstFormat));

  1766. 

  1767.         if (INLINE_MMXEXT(cpu_flags))

  1768.             cpucaps = "MMXEXT";

  1769.         else if (INLINE_AMD3DNOW(cpu_flags))

  1770.             cpucaps = "3DNOW";

  1771.         else if (INLINE_MMX(cpu_flags))

  1772.             cpucaps = "MMX";

  1773.         else if (PPC_ALTIVEC(cpu_flags))

  1774.             cpucaps = "AltiVec";

  1775.         else

  1776.             cpucaps = "C";

  1777. 

  1778.         av_log(c, AV_LOG_INFO, "using %s\n", cpucaps);

  1779. 

  1780.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1781.         av_log(c, AV_LOG_DEBUG,

  1782.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1783.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1784.         av_log(c, AV_LOG_DEBUG,

  1785.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1786.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1787.                c->chrXInc, c->chrYInc);

  1788.     }

  1789. 

  1790.     /* alpha blend special case, note this has been split via cascaded contexts if its scaled */

  1791.     if (unscaled && !usesHFilter && !usesVFilter &&

  1792.         c->alphablend != SWS_ALPHA_BLEND_NONE &&

  1793.         isALPHA(srcFormat) &&

  1794.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat)) &&

  1795.         alphaless_fmt(srcFormat) == dstFormat

  1796.     ) {

  1797.         c->swscale = ff_sws_alphablendaway;

  1798. 

  1799.         if (flags & SWS_PRINT_INFO)

  1800.             av_log(c, AV_LOG_INFO,

  1801.                     "using alpha blendaway %s -> %s special converter\n",

  1802.                     av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1803.         return 0;

  1804.     }

  1805. 

  1806.     /* unscaled special cases */

  1807.     if (unscaled && !usesHFilter && !usesVFilter &&

  1808.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1809.         ff_get_unscaled_swscale(c);

  1810. 

  1811.         if (c->swscale) {

  1812.             if (flags & SWS_PRINT_INFO)

  1813.                 av_log(c, AV_LOG_INFO,

  1814.                        "using unscaled %s -> %s special converter\n",

  1815.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1816.             return 0;

  1817.         }

  1818.     }

  1819. 

  1820.     c->swscale = ff_getSwsFunc(c);

  1821.     return ff_init_filters(c);

  1822. fail: // FIXME replace things by appropriate error codes

  1823.     if (ret == RETCODE_USE_CASCADE)  {

  1824.         int tmpW = sqrt(srcW * (int64_t)dstW);

  1825.         int tmpH = sqrt(srcH * (int64_t)dstH);

  1826.         enum AVPixelFormat tmpFormat = AV_PIX_FMT_YUV420P;

  1827. 

  1828.         if (isALPHA(srcFormat))

  1829.             tmpFormat = AV_PIX_FMT_YUVA420P;

  1830. 

  1831.         if (srcW*(int64_t)srcH <= 4LL*dstW*dstH)

  1832.             return AVERROR(EINVAL);

  1833. 

  1834.         ret = av_image_alloc(c->cascaded_tmp, c->cascaded_tmpStride,

  1835.                              tmpW, tmpH, tmpFormat, 64);

  1836.         if (ret < 0)

  1837.             return ret;

  1838. 

  1839.         c->cascaded_context[0] = sws_getContext(srcW, srcH, srcFormat,

  1840.                                                 tmpW, tmpH, tmpFormat,

  1841.                                                 flags, srcFilter, NULL, c->param);

  1842.         if (!c->cascaded_context[0])

  1843.             return -1;

  1844. 

  1845.         c->cascaded_context[1] = sws_getContext(tmpW, tmpH, tmpFormat,

  1846.                                                 dstW, dstH, dstFormat,

  1847.                                                 flags, NULL, dstFilter, c->param);

  1848.         if (!c->cascaded_context[1])

  1849.             return -1;

  1850.         return 0;

  1851.     }

  1852.     return -1;

  1853. }

  1854. 

  1855. SwsContext *sws_alloc_set_opts(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1856.                                int dstW, int dstH, enum AVPixelFormat dstFormat,

  1857.                                int flags, const double *param)

  1858. {

  1859.     SwsContext *c;

  1860. 

  1861.     if (!(c = sws_alloc_context()))

  1862.         return NULL;

  1863. 

  1864.     c->flags     = flags;

  1865.     c->srcW      = srcW;

  1866.     c->srcH      = srcH;

  1867.     c->dstW      = dstW;

  1868.     c->dstH      = dstH;

  1869.     c->srcFormat = srcFormat;

  1870.     c->dstFormat = dstFormat;

  1871. 

  1872.     if (param) {

  1873.         c->param[0] = param[0];

  1874.         c->param[1] = param[1];

  1875.     }

  1876. 

  1877.     return c;

  1878. }

  1879. 

  1880. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1881.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1882.                            int flags, SwsFilter *srcFilter,

  1883.                            SwsFilter *dstFilter, const double *param)

  1884. {

  1885.     SwsContext *c;

  1886. 

  1887.     c = sws_alloc_set_opts(srcW, srcH, srcFormat,

  1888.                            dstW, dstH, dstFormat,

  1889.                            flags, param);

  1890.     if (!c)

  1891.         return NULL;

  1892. 

  1893.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1894.         sws_freeContext(c);

  1895.         return NULL;

  1896.     }

  1897. 

  1898.     return c;

  1899. }

  1900. 

  1901. static int isnan_vec(SwsVector *a)

  1902. {

  1903.     int i;

  1904.     for (i=0; i<a->length; i++)

  1905.         if (isnan(a->coeff[i]))

  1906.             return 1;

  1907.     return 0;

  1908. }

  1909. 

  1910. static void makenan_vec(SwsVector *a)

  1911. {

  1912.     int i;

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

  1914.         a->coeff[i] = NAN;

  1915. }

  1916. 

  1917. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1918.                                 float lumaSharpen, float chromaSharpen,

  1919.                                 float chromaHShift, float chromaVShift,

  1920.                                 int verbose)

  1921. {

  1922.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1923.     if (!filter)

  1924.         return NULL;

  1925. 

  1926.     if (lumaGBlur != 0.0) {

  1927.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1928.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1929.     } else {

  1930.         filter->lumH = sws_getIdentityVec();

  1931.         filter->lumV = sws_getIdentityVec();

  1932.     }

  1933. 

  1934.     if (chromaGBlur != 0.0) {

  1935.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1936.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1937.     } else {

  1938.         filter->chrH = sws_getIdentityVec();

  1939.         filter->chrV = sws_getIdentityVec();

  1940.     }

  1941. 

  1942.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1943.         goto fail;

  1944. 

  1945.     if (chromaSharpen != 0.0) {

  1946.         SwsVector *id = sws_getIdentityVec();

  1947.         if (!id)

  1948.             goto fail;

  1949.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1950.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1951.         sws_addVec(filter->chrH, id);

  1952.         sws_addVec(filter->chrV, id);

  1953.         sws_freeVec(id);

  1954.     }

  1955. 

  1956.     if (lumaSharpen != 0.0) {

  1957.         SwsVector *id = sws_getIdentityVec();

  1958.         if (!id)

  1959.             goto fail;

  1960.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1961.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1962.         sws_addVec(filter->lumH, id);

  1963.         sws_addVec(filter->lumV, id);

  1964.         sws_freeVec(id);

  1965.     }

  1966. 

  1967.     if (chromaHShift != 0.0)

  1968.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1969. 

  1970.     if (chromaVShift != 0.0)

  1971.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1972. 

  1973.     sws_normalizeVec(filter->chrH, 1.0);

  1974.     sws_normalizeVec(filter->chrV, 1.0);

  1975.     sws_normalizeVec(filter->lumH, 1.0);

  1976.     sws_normalizeVec(filter->lumV, 1.0);

  1977. 

  1978.     if (isnan_vec(filter->chrH) ||

  1979.         isnan_vec(filter->chrV) ||

  1980.         isnan_vec(filter->lumH) ||

  1981.         isnan_vec(filter->lumV))

  1982.         goto fail;

  1983. 

  1984.     if (verbose)

  1985.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1986.     if (verbose)

  1987.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1988. 

  1989.     return filter;

  1990. 

  1991. fail:

  1992.     sws_freeVec(filter->lumH);

  1993.     sws_freeVec(filter->lumV);

  1994.     sws_freeVec(filter->chrH);

  1995.     sws_freeVec(filter->chrV);

  1996.     av_freep(&filter);

  1997.     return NULL;

  1998. }

  1999. 

  2000. SwsVector *sws_allocVec(int length)

  2001. {

  2002.     SwsVector *vec;

  2003. 

  2004.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  2005.         return NULL;

  2006. 

  2007.     vec = av_malloc(sizeof(SwsVector));

  2008.     if (!vec)

  2009.         return NULL;

  2010.     vec->length = length;

  2011.     vec->coeff  = av_malloc(sizeof(double) * length);

  2012.     if (!vec->coeff)

  2013.         av_freep(&vec);

  2014.     return vec;

  2015. }

  2016. 

  2017. SwsVector *sws_getGaussianVec(double variance, double quality)

  2018. {

  2019.     const int length = (int)(variance * quality + 0.5) | 1;

  2020.     int i;

  2021.     double middle  = (length - 1) * 0.5;

  2022.     SwsVector *vec;

  2023. 

  2024.     if(variance < 0 || quality < 0)

  2025.         return NULL;

  2026. 

  2027.     vec = sws_allocVec(length);

  2028. 

  2029.     if (!vec)

  2030.         return NULL;

  2031. 

  2032.     for (i = 0; i < length; i++) {

  2033.         double dist = i - middle;

  2034.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  2035.                         sqrt(2 * variance * M_PI);

  2036.     }

  2037. 

  2038.     sws_normalizeVec(vec, 1.0);

  2039. 

  2040.     return vec;

  2041. }

  2042. 

  2043. SwsVector *sws_getConstVec(double c, int length)

  2044. {

  2045.     int i;

  2046.     SwsVector *vec = sws_allocVec(length);

  2047. 

  2048.     if (!vec)

  2049.         return NULL;

  2050. 

  2051.     for (i = 0; i < length; i++)

  2052.         vec->coeff[i] = c;

  2053. 

  2054.     return vec;

  2055. }

  2056. 

  2057. SwsVector *sws_getIdentityVec(void)

  2058. {

  2059.     return sws_getConstVec(1.0, 1);

  2060. }

  2061. 

  2062. static double sws_dcVec(SwsVector *a)

  2063. {

  2064.     int i;

  2065.     double sum = 0;

  2066. 

  2067.     for (i = 0; i < a->length; i++)

  2068.         sum += a->coeff[i];

  2069. 

  2070.     return sum;

  2071. }

  2072. 

  2073. void sws_scaleVec(SwsVector *a, double scalar)

  2074. {

  2075.     int i;

  2076. 

  2077.     for (i = 0; i < a->length; i++)

  2078.         a->coeff[i] *= scalar;

  2079. }

  2080. 

  2081. void sws_normalizeVec(SwsVector *a, double height)

  2082. {

  2083.     sws_scaleVec(a, height / sws_dcVec(a));

  2084. }

  2085. 

  2086. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  2087. {

  2088.     int length = a->length + b->length - 1;

  2089.     int i, j;

  2090.     SwsVector *vec = sws_getConstVec(0.0, length);

  2091. 

  2092.     if (!vec)

  2093.         return NULL;

  2094. 

  2095.     for (i = 0; i < a->length; i++) {

  2096.         for (j = 0; j < b->length; j++) {

  2097.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  2098.         }

  2099.     }

  2100. 

  2101.     return vec;

  2102. }

  2103. 

  2104. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  2105. {

  2106.     int length = FFMAX(a->length, b->length);

  2107.     int i;

  2108.     SwsVector *vec = sws_getConstVec(0.0, length);

  2109. 

  2110.     if (!vec)

  2111.         return NULL;

  2112. 

  2113.     for (i = 0; i < a->length; i++)

  2114.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2115.     for (i = 0; i < b->length; i++)

  2116.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  2117. 

  2118.     return vec;

  2119. }

  2120. 

  2121. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  2122. {

  2123.     int length = FFMAX(a->length, b->length);

  2124.     int i;

  2125.     SwsVector *vec = sws_getConstVec(0.0, length);

  2126. 

  2127.     if (!vec)

  2128.         return NULL;

  2129. 

  2130.     for (i = 0; i < a->length; i++)

  2131.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  2132.     for (i = 0; i < b->length; i++)

  2133.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  2134. 

  2135.     return vec;

  2136. }

  2137. 

  2138. /* shift left / or right if "shift" is negative */

  2139. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  2140. {

  2141.     int length = a->length + FFABS(shift) * 2;

  2142.     int i;

  2143.     SwsVector *vec = sws_getConstVec(0.0, length);

  2144. 

  2145.     if (!vec)

  2146.         return NULL;

  2147. 

  2148.     for (i = 0; i < a->length; i++) {

  2149.         vec->coeff[i + (length    - 1) / 2 -

  2150.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  2151.     }

  2152. 

  2153.     return vec;

  2154. }

  2155. 

  2156. void sws_shiftVec(SwsVector *a, int shift)

  2157. {

  2158.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  2159.     if (!shifted) {

  2160.         makenan_vec(a);

  2161.         return;

  2162.     }

  2163.     av_free(a->coeff);

  2164.     a->coeff  = shifted->coeff;

  2165.     a->length = shifted->length;

  2166.     av_free(shifted);

  2167. }

  2168. 

  2169. void sws_addVec(SwsVector *a, SwsVector *b)

  2170. {

  2171.     SwsVector *sum = sws_sumVec(a, b);

  2172.     if (!sum) {

  2173.         makenan_vec(a);

  2174.         return;

  2175.     }

  2176.     av_free(a->coeff);

  2177.     a->coeff  = sum->coeff;

  2178.     a->length = sum->length;

  2179.     av_free(sum);

  2180. }

  2181. 

  2182. void sws_subVec(SwsVector *a, SwsVector *b)

  2183. {

  2184.     SwsVector *diff = sws_diffVec(a, b);

  2185.     if (!diff) {

  2186.         makenan_vec(a);

  2187.         return;

  2188.     }

  2189.     av_free(a->coeff);

  2190.     a->coeff  = diff->coeff;

  2191.     a->length = diff->length;

  2192.     av_free(diff);

  2193. }

  2194. 

  2195. void sws_convVec(SwsVector *a, SwsVector *b)

  2196. {

  2197.     SwsVector *conv = sws_getConvVec(a, b);

  2198.     if (!conv) {

  2199.         makenan_vec(a);

  2200.         return;

  2201.     }

  2202.     av_free(a->coeff);

  2203.     a->coeff  = conv->coeff;

  2204.     a->length = conv->length;

  2205.     av_free(conv);

  2206. }

  2207. 

  2208. SwsVector *sws_cloneVec(SwsVector *a)

  2209. {

  2210.     SwsVector *vec = sws_allocVec(a->length);

  2211. 

  2212.     if (!vec)

  2213.         return NULL;

  2214. 

  2215.     memcpy(vec->coeff, a->coeff, a->length * sizeof(*a->coeff));

  2216. 

  2217.     return vec;

  2218. }

  2219. 

  2220. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  2221. {

  2222.     int i;

  2223.     double max = 0;

  2224.     double min = 0;

  2225.     double range;

  2226. 

  2227.     for (i = 0; i < a->length; i++)

  2228.         if (a->coeff[i] > max)

  2229.             max = a->coeff[i];

  2230. 

  2231.     for (i = 0; i < a->length; i++)

  2232.         if (a->coeff[i] < min)

  2233.             min = a->coeff[i];

  2234. 

  2235.     range = max - min;

  2236. 

  2237.     for (i = 0; i < a->length; i++) {

  2238.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  2239.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  2240.         for (; x > 0; x--)

  2241.             av_log(log_ctx, log_level, " ");

  2242.         av_log(log_ctx, log_level, "|\n");

  2243.     }

  2244. }

  2245. 

  2246. void sws_freeVec(SwsVector *a)

  2247. {

  2248.     if (!a)

  2249.         return;

  2250.     av_freep(&a->coeff);

  2251.     a->length = 0;

  2252.     av_free(a);

  2253. }

  2254. 

  2255. void sws_freeFilter(SwsFilter *filter)

  2256. {

  2257.     if (!filter)

  2258.         return;

  2259. 

  2260.     sws_freeVec(filter->lumH);

  2261.     sws_freeVec(filter->lumV);

  2262.     sws_freeVec(filter->chrH);

  2263.     sws_freeVec(filter->chrV);

  2264.     av_free(filter);

  2265. }

  2266. 

  2267. void sws_freeContext(SwsContext *c)

  2268. {

  2269.     int i;

  2270.     if (!c)

  2271.         return;

  2272. 

  2273.     if (c->lumPixBuf) {

  2274.         for (i = 0; i < c->vLumBufSize; i++)

  2275.             av_freep(&c->lumPixBuf[i]);

  2276.         av_freep(&c->lumPixBuf);

  2277.     }

  2278. 

  2279.     if (c->chrUPixBuf) {

  2280.         for (i = 0; i < c->vChrBufSize; i++)

  2281.             av_freep(&c->chrUPixBuf[i]);

  2282.         av_freep(&c->chrUPixBuf);

  2283.         av_freep(&c->chrVPixBuf);

  2284.     }

  2285. 

  2286.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  2287.         for (i = 0; i < c->vLumBufSize; i++)

  2288.             av_freep(&c->alpPixBuf[i]);

  2289.         av_freep(&c->alpPixBuf);

  2290.     }

  2291. 

  2292.     for (i = 0; i < 4; i++)

  2293.         av_freep(&c->dither_error[i]);

  2294. 

  2295.     av_freep(&c->vLumFilter);

  2296.     av_freep(&c->vChrFilter);

  2297.     av_freep(&c->hLumFilter);

  2298.     av_freep(&c->hChrFilter);

  2299. #if HAVE_ALTIVEC

  2300.     av_freep(&c->vYCoeffsBank);

  2301.     av_freep(&c->vCCoeffsBank);

  2302. #endif

  2303. 

  2304.     av_freep(&c->vLumFilterPos);

  2305.     av_freep(&c->vChrFilterPos);

  2306.     av_freep(&c->hLumFilterPos);

  2307.     av_freep(&c->hChrFilterPos);

  2308. 

  2309. #if HAVE_MMX_INLINE

  2310. #if USE_MMAP

  2311.     if (c->lumMmxextFilterCode)

  2312.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  2313.     if (c->chrMmxextFilterCode)

  2314.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  2315. #elif HAVE_VIRTUALALLOC

  2316.     if (c->lumMmxextFilterCode)

  2317.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2318.     if (c->chrMmxextFilterCode)

  2319.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2320. #else

  2321.     av_free(c->lumMmxextFilterCode);

  2322.     av_free(c->chrMmxextFilterCode);

  2323. #endif

  2324.     c->lumMmxextFilterCode = NULL;

  2325.     c->chrMmxextFilterCode = NULL;

  2326. #endif /* HAVE_MMX_INLINE */

  2327. 

  2328.     av_freep(&c->yuvTable);

  2329.     av_freep(&c->formatConvBuffer);

  2330. 

  2331.     sws_freeContext(c->cascaded_context[0]);

  2332.     sws_freeContext(c->cascaded_context[1]);

  2333.     sws_freeContext(c->cascaded_context[2]);

  2334.     memset(c->cascaded_context, 0, sizeof(c->cascaded_context));

  2335.     av_freep(&c->cascaded_tmp[0]);

  2336.     av_freep(&c->cascaded1_tmp[0]);

  2337. 

  2338.     av_freep(&c->gamma);

  2339.     av_freep(&c->inv_gamma);

  2340. 

  2341.     ff_free_filters(c);

  2342. 

  2343.     av_free(c);

  2344. }

  2345. 

  2346. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2347.                                         int srcH, enum AVPixelFormat srcFormat,

  2348.                                         int dstW, int dstH,

  2349.                                         enum AVPixelFormat dstFormat, int flags,

  2350.                                         SwsFilter *srcFilter,

  2351.                                         SwsFilter *dstFilter,

  2352.                                         const double *param)

  2353. {

  2354.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2355.                                              SWS_PARAM_DEFAULT };

  2356.     int64_t src_h_chr_pos = -513, dst_h_chr_pos = -513,

  2357.             src_v_chr_pos = -513, dst_v_chr_pos = -513;

  2358. 

  2359.     if (!param)

  2360.         param = default_param;

  2361. 

  2362.     if (context &&

  2363.         (context->srcW      != srcW      ||

  2364.          context->srcH      != srcH      ||

  2365.          context->srcFormat != srcFormat ||

  2366.          context->dstW      != dstW      ||

  2367.          context->dstH      != dstH      ||

  2368.          context->dstFormat != dstFormat ||

  2369.          context->flags     != flags     ||

  2370.          context->param[0]  != param[0]  ||

  2371.          context->param[1]  != param[1])) {

  2372. 

  2373.         av_opt_get_int(context, "src_h_chr_pos", 0, &src_h_chr_pos);

  2374.         av_opt_get_int(context, "src_v_chr_pos", 0, &src_v_chr_pos);

  2375.         av_opt_get_int(context, "dst_h_chr_pos", 0, &dst_h_chr_pos);

  2376.         av_opt_get_int(context, "dst_v_chr_pos", 0, &dst_v_chr_pos);

  2377.         sws_freeContext(context);

  2378.         context = NULL;

  2379.     }

  2380. 

  2381.     if (!context) {

  2382.         if (!(context = sws_alloc_context()))

  2383.             return NULL;

  2384.         context->srcW      = srcW;

  2385.         context->srcH      = srcH;

  2386.         context->srcFormat = srcFormat;

  2387.         context->dstW      = dstW;

  2388.         context->dstH      = dstH;

  2389.         context->dstFormat = dstFormat;

  2390.         context->flags     = flags;

  2391.         context->param[0]  = param[0];

  2392.         context->param[1]  = param[1];

  2393. 

  2394.         av_opt_set_int(context, "src_h_chr_pos", src_h_chr_pos, 0);

  2395.         av_opt_set_int(context, "src_v_chr_pos", src_v_chr_pos, 0);

  2396.         av_opt_set_int(context, "dst_h_chr_pos", dst_h_chr_pos, 0);

  2397.         av_opt_set_int(context, "dst_v_chr_pos", dst_v_chr_pos, 0);

  2398. 

  2399.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2400.             sws_freeContext(context);

  2401.             return NULL;

  2402.         }

  2403.     }

  2404.     return context;

  2405. }