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FFmpeg/libswscale/utils.c

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  1. /*

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

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

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

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

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

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

  51. #include "rgb2rgb.h"

  52. #include "swscale.h"

  53. #include "swscale_internal.h"

  54. 

  55. static void handle_formats(SwsContext *c);

  56. 

  57. unsigned swscale_version(void)

  58. {

  59.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  60.     return LIBSWSCALE_VERSION_INT;

  61. }

  62. 

  63. const char *swscale_configuration(void)

  64. {

  65.     return FFMPEG_CONFIGURATION;

  66. }

  67. 

  68. const char *swscale_license(void)

  69. {

  70. #define LICENSE_PREFIX "libswscale license: "

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

  72. }

  73. 

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

  75. 

  76. typedef struct FormatEntry {

  77.     uint8_t is_supported_in         :1;

  78.     uint8_t is_supported_out        :1;

  79.     uint8_t is_supported_endianness :1;

  80. } FormatEntry;

  81. 

  82. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  167.     [AV_PIX_FMT_BGRA64BE]    = { 0, 0 },

  168.     [AV_PIX_FMT_BGRA64LE]    = { 0, 0 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  204.     [AV_PIX_FMT_XYZ12BE]     = { 1, 0, 1 },

  205.     [AV_PIX_FMT_XYZ12LE]     = { 1, 0, 1 },

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

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

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

  209. };

  210. 

  211. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  212. {

  213.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  214.            format_entries[pix_fmt].is_supported_in : 0;

  215. }

  216. 

  217. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  218. {

  219.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  220.            format_entries[pix_fmt].is_supported_out : 0;

  221. }

  222. 

  223. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  224. {

  225.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  226.            format_entries[pix_fmt].is_supported_endianness : 0;

  227. }

  228. 

  229. extern const int32_t ff_yuv2rgb_coeffs[8][4];

  230. 

  231. #if FF_API_SWS_FORMAT_NAME

  232. const char *sws_format_name(enum AVPixelFormat format)

  233. {

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

  235.     if (desc)

  236.         return desc->name;

  237.     else

  238.         return "Unknown format";

  239. }

  240. #endif

  241. 

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

  243.                              double dist)

  244. {

  245.     if (dist <= 1.0)

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

  247.     else

  248.         return getSplineCoeff(0.0,

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

  250.                                c + 3.0 * d,

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

  252.                               dist - 1.0);

  253. }

  254. 

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

  256. {

  257.     if (pos < 0) {

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

  259.     }

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

  261.     return pos >> chr_subsample;

  262. }

  263. 

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

  265.                               int *outFilterSize, int xInc, int srcW,

  266.                               int dstW, int filterAlign, int one,

  267.                               int flags, int cpu_flags,

  268.                               SwsVector *srcFilter, SwsVector *dstFilter,

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

  270. {

  271.     int i;

  272.     int filterSize;

  273.     int filter2Size;

  274.     int minFilterSize;

  275.     int64_t *filter    = NULL;

  276.     int64_t *filter2   = NULL;

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

  278.     int ret            = -1;

  279. 

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

  281. 

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

  283.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

  284. 

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

  286.         int i;

  287.         filterSize = 1;

  288.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  290. 

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

  292.             filter[i * filterSize] = fone;

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

  294.         }

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

  296.         int i;

  297.         int64_t xDstInSrc;

  298.         filterSize = 1;

  299.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  301. 

  302.         xDstInSrc = ((srcPos*xInc)>>8) - ((dstPos*0x8000)>>7);

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

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

  305. 

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

  307.             filter[i]       = fone;

  308.             xDstInSrc      += xInc;

  309.         }

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

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

  312.         int i;

  313.         int64_t xDstInSrc;

  314.         filterSize = 2;

  315.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  317. 

  318.         xDstInSrc = ((srcPos*xInc)>>8) - ((dstPos*0x8000)>>7);

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

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

  321.             int j;

  322. 

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

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

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

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

  327.                 if (coeff < 0)

  328.                     coeff = 0;

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

  330.                 xx++;

  331.             }

  332.             xDstInSrc += xInc;

  333.         }

  334.     } else {

  335.         int64_t xDstInSrc;

  336.         int sizeFactor;

  337. 

  338.         if (flags & SWS_BICUBIC)

  339.             sizeFactor = 4;

  340.         else if (flags & SWS_X)

  341.             sizeFactor = 8;

  342.         else if (flags & SWS_AREA)

  343.             sizeFactor = 1;     // downscale only, for upscale it is bilinear

  344.         else if (flags & SWS_GAUSS)

  345.             sizeFactor = 8;     // infinite ;)

  346.         else if (flags & SWS_LANCZOS)

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

  348.         else if (flags & SWS_SINC)

  349.             sizeFactor = 20;    // infinite ;)

  350.         else if (flags & SWS_SPLINE)

  351.             sizeFactor = 20;    // infinite ;)

  352.         else if (flags & SWS_BILINEAR)

  353.             sizeFactor = 2;

  354.         else {

  355.             av_assert0(0);

  356.         }

  357. 

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

  359.             filterSize = 1 + sizeFactor;    // upscale

  360.         else

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

  362. 

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

  364.         filterSize = FFMAX(filterSize, 1);

  365. 

  366.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  368. 

  369.         xDstInSrc = ((srcPos*xInc)>>7) - ((dstPos*0x10000)>>7);

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

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

  372.             int j;

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

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

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

  376.                 double floatd;

  377.                 int64_t coeff;

  378. 

  379.                 if (xInc > 1 << 16)

  380.                     d = d * dstW / srcW;

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

  382. 

  383.                 if (flags & SWS_BICUBIC) {

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

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

  386. 

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

  388.                         coeff = 0.0;

  389.                     } else {

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

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

  392. 

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

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

  395.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  396.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  397.                         else

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

  399.                                       (6 * B + 30 * C) * dd  +

  400.                                     (-12 * B - 48 * C) * d   +

  401.                                       (8 * B + 24 * C) * (1 << 30);

  402.                     }

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

  404.                 }

  405. #if 0

  406.                 else if (flags & SWS_X) {

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

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

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

  410.                 }

  411. #endif

  412.                 else if (flags & SWS_X) {

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

  414.                     double c;

  415. 

  416.                     if (floatd < 1.0)

  417.                         c = cos(floatd * M_PI);

  418.                     else

  419.                         c = -1.0;

  420.                     if (c < 0.0)

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

  422.                     else

  423.                         c = pow(c, A);

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

  425.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  431.                     else

  432.                         coeff = 0.0;

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

  434.                 } else if (flags & SWS_GAUSS) {

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

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

  437.                 } else if (flags & SWS_SINC) {

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

  439.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  443.                     if (floatd > p)

  444.                         coeff = 0;

  445.                 } else if (flags & SWS_BILINEAR) {

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

  447.                     if (coeff < 0)

  448.                         coeff = 0;

  449.                     coeff *= fone >> 30;

  450.                 } else if (flags & SWS_SPLINE) {

  451.                     double p = -2.196152422706632;

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

  453.                 } else {

  454.                     av_assert0(0);

  455.                 }

  456. 

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

  458.                 xx++;

  459.             }

  460.             xDstInSrc += 2 * xInc;

  461.         }

  462.     }

  463. 

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

  465.      * av_free(filter);

  466.      */

  467.     av_assert0(filterSize > 0);

  468.     filter2Size = filterSize;

  469.     if (srcFilter)

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

  471.     if (dstFilter)

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

  473.     av_assert0(filter2Size > 0);

  474.     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);

  475. 

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

  477.         int j, k;

  478. 

  479.         if (srcFilter) {

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

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

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

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

  484.             }

  485.         } else {

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

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

  488.         }

  489.         // FIXME dstFilter

  490. 

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

  492.     }

  493.     av_freep(&filter);

  494. 

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

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

  497.     minFilterSize = 0;

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

  499.         int min = filter2Size;

  500.         int j;

  501.         int64_t cutOff = 0.0;

  502. 

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

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

  505.             int k;

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

  507. 

  508.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  509.                 break;

  510. 

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

  512.              * filter otherwise */

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

  514.                 break;

  515. 

  516.             // move filter coefficients left

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

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

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

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

  521.         }

  522. 

  523.         cutOff = 0;

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

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

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

  527. 

  528.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  529.                 break;

  530.             min--;

  531.         }

  532. 

  533.         if (min > minFilterSize)

  534.             minFilterSize = min;

  535.     }

  536. 

  537.     if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {

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

  539.         if (minFilterSize < 5)

  540.             filterAlign = 4;

  541. 

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

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

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

  545.         if (minFilterSize < 3)

  546.             filterAlign = 1;

  547.     }

  548. 

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

  550.         // special case for unscaled vertical filtering

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

  552.             filterAlign = 1;

  553.     }

  554. 

  555.     av_assert0(minFilterSize > 0);

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

  557.     av_assert0(filterSize > 0);

  558.     filter = av_malloc(filterSize * dstW * sizeof(*filter));

  559.     if (filterSize >= MAX_FILTER_SIZE * 16 /

  560.                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {

  561.         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreem scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);

  562.         goto fail;

  563.     }

  564.     *outFilterSize = filterSize;

  565. 

  566.     if (flags & SWS_PRINT_INFO)

  567.         av_log(NULL, AV_LOG_VERBOSE,

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

  569.                filter2Size, filterSize);

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

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

  572.         int j;

  573. 

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

  575.             if (j >= filter2Size)

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

  577.             else

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

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

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

  581.         }

  582.     }

  583. 

  584.     // FIXME try to align filterPos if possible

  585. 

  586.     // fix borders

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

  588.         int j;

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

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

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

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

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

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

  595.             }

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

  597.         }

  598. 

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

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

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

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

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

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

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

  606.             }

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

  608.         }

  609.     }

  610. 

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

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

  613.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  615. 

  616.     /* normalize & store in outFilter */

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

  618.         int j;

  619.         int64_t error = 0;

  620.         int64_t sum   = 0;

  621. 

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

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

  624.         }

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

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

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

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

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

  630.             error                                  = v - intV * sum;

  631.         }

  632.     }

  633. 

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

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

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

  637.                                                       * read over the end */

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

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

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

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

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

  643.     }

  644. 

  645.     ret = 0;

  646. 

  647. fail:

  648.     if(ret < 0)

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

  650.     av_free(filter);

  651.     av_free(filter2);

  652.     return ret;

  653. }

  654. 

  655. #if HAVE_MMXEXT_INLINE

  656. static av_cold int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,

  657.                                        int16_t *filter, int32_t *filterPos,

  658.                                        int numSplits)

  659. {

  660.     uint8_t *fragmentA;

  661.     x86_reg imm8OfPShufW1A;

  662.     x86_reg imm8OfPShufW2A;

  663.     x86_reg fragmentLengthA;

  664.     uint8_t *fragmentB;

  665.     x86_reg imm8OfPShufW1B;

  666.     x86_reg imm8OfPShufW2B;

  667.     x86_reg fragmentLengthB;

  668.     int fragmentPos;

  669. 

  670.     int xpos, i;

  671. 

  672.     // create an optimized horizontal scaling routine

  673.     /* This scaler is made of runtime-generated MMXEXT code using specially tuned

  674.      * pshufw instructions. For every four output pixels, if four input pixels

  675.      * are enough for the fast bilinear scaling, then a chunk of fragmentB is

  676.      * used. If five input pixels are needed, then a chunk of fragmentA is used.

  677.      */

  678. 

  679.     // code fragment

  680. 

  681.     __asm__ volatile (

  682.         "jmp                         9f                 \n\t"

  683.         // Begin

  684.         "0:                                             \n\t"

  685.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  686.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  687.         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"

  688.         "punpcklbw                %%mm7, %%mm1          \n\t"

  689.         "punpcklbw                %%mm7, %%mm0          \n\t"

  690.         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"

  691.         "1:                                             \n\t"

  692.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  693.         "2:                                             \n\t"

  694.         "psubw                    %%mm1, %%mm0          \n\t"

  695.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  696.         "pmullw                   %%mm3, %%mm0          \n\t"

  697.         "psllw                       $7, %%mm1          \n\t"

  698.         "paddw                    %%mm1, %%mm0          \n\t"

  699. 

  700.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  701. 

  702.         "add                         $8, %%"REG_a"      \n\t"

  703.         // End

  704.         "9:                                             \n\t"

  705.         // "int $3                                         \n\t"

  706.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  707.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  708.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  709.         "dec                         %1                 \n\t"

  710.         "dec                         %2                 \n\t"

  711.         "sub                         %0, %1             \n\t"

  712.         "sub                         %0, %2             \n\t"

  713.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  714.         "sub                         %0, %3             \n\t"

  715. 

  716. 

  717.         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),

  718.           "=r" (fragmentLengthA)

  719.         );

  720. 

  721.     __asm__ volatile (

  722.         "jmp                         9f                 \n\t"

  723.         // Begin

  724.         "0:                                             \n\t"

  725.         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"

  726.         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"

  727.         "punpcklbw                %%mm7, %%mm0          \n\t"

  728.         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"

  729.         "1:                                             \n\t"

  730.         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"

  731.         "2:                                             \n\t"

  732.         "psubw                    %%mm1, %%mm0          \n\t"

  733.         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"

  734.         "pmullw                   %%mm3, %%mm0          \n\t"

  735.         "psllw                       $7, %%mm1          \n\t"

  736.         "paddw                    %%mm1, %%mm0          \n\t"

  737. 

  738.         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"

  739. 

  740.         "add                         $8, %%"REG_a"      \n\t"

  741.         // End

  742.         "9:                                             \n\t"

  743.         // "int                       $3                   \n\t"

  744.         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"

  745.         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"

  746.         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

  747.         "dec                         %1                 \n\t"

  748.         "dec                         %2                 \n\t"

  749.         "sub                         %0, %1             \n\t"

  750.         "sub                         %0, %2             \n\t"

  751.         "lea       " LOCAL_MANGLE(9b) ", %3             \n\t"

  752.         "sub                         %0, %3             \n\t"

  753. 

  754. 

  755.         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),

  756.           "=r" (fragmentLengthB)

  757.         );

  758. 

  759.     xpos        = 0; // lumXInc/2 - 0x8000; // difference between pixel centers

  760.     fragmentPos = 0;

  761. 

  762.     for (i = 0; i < dstW / numSplits; i++) {

  763.         int xx = xpos >> 16;

  764. 

  765.         if ((i & 3) == 0) {

  766.             int a                  = 0;

  767.             int b                  = ((xpos + xInc) >> 16) - xx;

  768.             int c                  = ((xpos + xInc * 2) >> 16) - xx;

  769.             int d                  = ((xpos + xInc * 3) >> 16) - xx;

  770.             int inc                = (d + 1 < 4);

  771.             uint8_t *fragment      = (d + 1 < 4) ? fragmentB : fragmentA;

  772.             x86_reg imm8OfPShufW1  = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;

  773.             x86_reg imm8OfPShufW2  = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;

  774.             x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;

  775.             int maxShift           = 3 - (d + inc);

  776.             int shift              = 0;

  777. 

  778.             if (filterCode) {

  779.                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;

  780.                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;

  781.                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;

  782.                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;

  783.                 filterPos[i / 2] = xx;

  784. 

  785.                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);

  786. 

  787.                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |

  788.                                                           ((b + inc) << 2) |

  789.                                                           ((c + inc) << 4) |

  790.                                                           ((d + inc) << 6);

  791.                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |

  792.                                                                (c << 4) |

  793.                                                                (d << 6);

  794. 

  795.                 if (i + 4 - inc >= dstW)

  796.                     shift = maxShift;               // avoid overread

  797.                 else if ((filterPos[i / 2] & 3) <= maxShift)

  798.                     shift = filterPos[i / 2] & 3;   // align

  799. 

  800.                 if (shift && i >= shift) {

  801.                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;

  802.                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;

  803.                     filterPos[i / 2]                        -= shift;

  804.                 }

  805.             }

  806. 

  807.             fragmentPos += fragmentLength;

  808. 

  809.             if (filterCode)

  810.                 filterCode[fragmentPos] = RET;

  811.         }

  812.         xpos += xInc;

  813.     }

  814.     if (filterCode)

  815.         filterPos[((i / 2) + 1) & (~1)] = xpos >> 16;  // needed to jump to the next part

  816. 

  817.     return fragmentPos + 1;

  818. }

  819. #endif /* HAVE_MMXEXT_INLINE */

  820. 

  821. static void getSubSampleFactors(int *h, int *v, enum AVPixelFormat format)

  822. {

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

  824.     *h = desc->log2_chroma_w;

  825.     *v = desc->log2_chroma_h;

  826. }

  827. 

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

  829. {

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

  831.     int64_t vr =  table[0];

  832.     int64_t ub =  table[1];

  833.     int64_t ug = -table[2];

  834.     int64_t vg = -table[3];

  835.     int64_t ONE = 65536;

  836.     int64_t cy = ONE;

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

  838.     int i;

  839.     static const int8_t map[] = {

  840.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  841.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  842.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  843.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  844.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  845.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  846.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  847.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  848.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  849.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  850.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  851.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  852.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  853.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

  854.     GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    ,

  855.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

  856.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  857.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

  858.     GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    ,

  859.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

  860.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  861.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

  862.     GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    ,

  863.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  864.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  865.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  866.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  867.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  868.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  869.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  870.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  871.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  875.     };

  876. 

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

  878. 

  879.     if (!dstRange) {

  880.         cy = cy * 255 / 219;

  881.     } else {

  882.         vr = vr * 224 / 255;

  883.         ub = ub * 224 / 255;

  884.         ug = ug * 224 / 255;

  885.         vg = vg * 224 / 255;

  886.     }

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

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

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

  890. 

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

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

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

  894. 

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

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

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

  898. 

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

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

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

  902. 

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

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

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

  906. 

  907.     if(/*!dstRange && */table == ff_yuv2rgb_coeffs[SWS_CS_DEFAULT]) {

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

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

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

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

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

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

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

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

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

  917.     }

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

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

  920. }

  921. 

  922. static void fill_xyztables(struct SwsContext *c)

  923. {

  924.     int i;

  925.     double xyzgamma = XYZ_GAMMA;

  926.     double rgbgamma = 1.0 / RGB_GAMMA;

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

  928.         {13270, -6295, -2041},

  929.         {-3969,  7682,   170},

  930.         {  228,  -835,  4329} };

  931.     static int16_t xyzgamma_tab[4096], rgbgamma_tab[4096];

  932. 

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

  934.     c->xyzgamma = xyzgamma_tab;

  935.     c->rgbgamma = rgbgamma_tab;

  936. 

  937.     if (rgbgamma_tab[4095])

  938.         return;

  939. 

  940.     /* set gamma vectors */

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

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

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

  944.     }

  945. }

  946. 

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

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

  949.                              int brightness, int contrast, int saturation)

  950. {

  951.     const AVPixFmtDescriptor *desc_dst;

  952.     const AVPixFmtDescriptor *desc_src;

  953.     memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);

  954.     memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);

  955. 

  956.     handle_formats(c);

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

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

  959. 

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

  961.         dstRange = 0;

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

  963.         srcRange = 0;

  964. 

  965.     c->brightness = brightness;

  966.     c->contrast   = contrast;

  967.     c->saturation = saturation;

  968.     c->srcRange   = srcRange;

  969.     c->dstRange   = dstRange;

  970. 

  971.     fill_xyztables(c);

  972. 

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

  974.         return -1;

  975. 

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

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

  978. 

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

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

  981.                              contrast, saturation);

  982.     // FIXME factorize

  983. 

  984.     if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)

  985.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  986.                                        contrast, saturation);

  987.     }

  988. 

  989.     fill_rgb2yuv_table(c, table, dstRange);

  990. 

  991.     return 0;

  992. }

  993. 

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

  995.                              int *srcRange, int **table, int *dstRange,

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

  997. {

  998.     if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat))

  999.         return -1;

  1000. 

  1001.     *inv_table  = c->srcColorspaceTable;

  1002.     *table      = c->dstColorspaceTable;

  1003.     *srcRange   = c->srcRange;

  1004.     *dstRange   = c->dstRange;

  1005.     *brightness = c->brightness;

  1006.     *contrast   = c->contrast;

  1007.     *saturation = c->saturation;

  1008. 

  1009.     return 0;

  1010. }

  1011. 

  1012. static int handle_jpeg(enum AVPixelFormat *format)

  1013. {

  1014.     switch (*format) {

  1015.     case AV_PIX_FMT_YUVJ420P:

  1016.         *format = AV_PIX_FMT_YUV420P;

  1017.         return 1;

  1018.     case AV_PIX_FMT_YUVJ411P:

  1019.         *format = AV_PIX_FMT_YUV411P;

  1020.         return 1;

  1021.     case AV_PIX_FMT_YUVJ422P:

  1022.         *format = AV_PIX_FMT_YUV422P;

  1023.         return 1;

  1024.     case AV_PIX_FMT_YUVJ444P:

  1025.         *format = AV_PIX_FMT_YUV444P;

  1026.         return 1;

  1027.     case AV_PIX_FMT_YUVJ440P:

  1028.         *format = AV_PIX_FMT_YUV440P;

  1029.         return 1;

  1030.     case AV_PIX_FMT_GRAY8:

  1031.         return 1;

  1032.     default:

  1033.         return 0;

  1034.     }

  1035. }

  1036. 

  1037. static int handle_0alpha(enum AVPixelFormat *format)

  1038. {

  1039.     switch (*format) {

  1040.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1041.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1042.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1043.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1044.     default:                                          return 0;

  1045.     }

  1046. }

  1047. 

  1048. static int handle_xyz(enum AVPixelFormat *format)

  1049. {

  1050.     switch (*format) {

  1051.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1052.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1053.     default:                                                return 0;

  1054.     }

  1055. }

  1056. 

  1057. static void handle_formats(SwsContext *c)

  1058. {

  1059.     c->src0Alpha |= handle_0alpha(&c->srcFormat);

  1060.     c->dst0Alpha |= handle_0alpha(&c->dstFormat);

  1061.     c->srcXYZ    |= handle_xyz(&c->srcFormat);

  1062.     c->dstXYZ    |= handle_xyz(&c->dstFormat);

  1063. }

  1064. 

  1065. SwsContext *sws_alloc_context(void)

  1066. {

  1067.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1068. 

  1069.     if (c) {

  1070.         c->av_class = &sws_context_class;

  1071.         av_opt_set_defaults(c);

  1072.     }

  1073. 

  1074.     return c;

  1075. }

  1076. 

  1077. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1078.                              SwsFilter *dstFilter)

  1079. {

  1080.     int i, j;

  1081.     int usesVFilter, usesHFilter;

  1082.     int unscaled;

  1083.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1084.     int srcW              = c->srcW;

  1085.     int srcH              = c->srcH;

  1086.     int dstW              = c->dstW;

  1087.     int dstH              = c->dstH;

  1088.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1089.     int flags, cpu_flags;

  1090.     enum AVPixelFormat srcFormat = c->srcFormat;

  1091.     enum AVPixelFormat dstFormat = c->dstFormat;

  1092.     const AVPixFmtDescriptor *desc_src;

  1093.     const AVPixFmtDescriptor *desc_dst;

  1094. 

  1095.     cpu_flags = av_get_cpu_flags();

  1096.     flags     = c->flags;

  1097.     emms_c();

  1098.     if (!rgb15to16)

  1099.         sws_rgb2rgb_init();

  1100. 

  1101.     unscaled = (srcW == dstW && srcH == dstH);

  1102. 

  1103.     c->srcRange |= handle_jpeg(&c->srcFormat);

  1104.     c->dstRange |= handle_jpeg(&c->dstFormat);

  1105. 

  1106.     if (!c->contrast && !c->saturation && !c->dstFormatBpp)

  1107.         sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1108.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1109.                                  c->dstRange, 0, 1 << 16, 1 << 16);

  1110. 

  1111.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1112.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1113.     handle_formats(c);

  1114.     srcFormat = c->srcFormat;

  1115.     dstFormat = c->dstFormat;

  1116.     desc_src = av_pix_fmt_desc_get(srcFormat);

  1117.     desc_dst = av_pix_fmt_desc_get(dstFormat);

  1118. 

  1119.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1120.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1121.     if (!sws_isSupportedInput(srcFormat)) {

  1122.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1123.                av_get_pix_fmt_name(srcFormat));

  1124.         return AVERROR(EINVAL);

  1125.     }

  1126.     if (!sws_isSupportedOutput(dstFormat)) {

  1127.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1128.                av_get_pix_fmt_name(dstFormat));

  1129.         return AVERROR(EINVAL);

  1130.     }

  1131.     }

  1132. 

  1133.     i = flags & (SWS_POINT         |

  1134.                  SWS_AREA          |

  1135.                  SWS_BILINEAR      |

  1136.                  SWS_FAST_BILINEAR |

  1137.                  SWS_BICUBIC       |

  1138.                  SWS_X             |

  1139.                  SWS_GAUSS         |

  1140.                  SWS_LANCZOS       |

  1141.                  SWS_SINC          |

  1142.                  SWS_SPLINE        |

  1143.                  SWS_BICUBLIN);

  1144.     if (!i || (i & (i - 1))) {

  1145.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1146.         return AVERROR(EINVAL);

  1147.     }

  1148.     /* sanity check */

  1149.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1150.         /* FIXME check if these are enough and try to lower them after

  1151.          * fixing the relevant parts of the code */

  1152.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1153.                srcW, srcH, dstW, dstH);

  1154.         return AVERROR(EINVAL);

  1155.     }

  1156. 

  1157.     if (!dstFilter)

  1158.         dstFilter = &dummyFilter;

  1159.     if (!srcFilter)

  1160.         srcFilter = &dummyFilter;

  1161. 

  1162.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1163.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1164.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1165.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1166.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1167. 

  1168.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1169.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1170.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1171.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1172.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1173.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1174.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1175.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1176. 

  1177.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  1178.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  1179. 

  1180.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1181.         if (dstW&1) {

  1182.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1183.             flags |= SWS_FULL_CHR_H_INT;

  1184.             c->flags = flags;

  1185.         }

  1186.     }

  1187. 

  1188.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1189.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1190.        dstFormat == AV_PIX_FMT_BGR8 ||

  1191.        dstFormat == AV_PIX_FMT_RGB8) {

  1192.         if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {

  1193.             av_log(c, AV_LOG_DEBUG,

  1194.                 "Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",

  1195.                 av_get_pix_fmt_name(dstFormat));

  1196.             flags   |= SWS_FULL_CHR_H_INT;

  1197.             c->flags = flags;

  1198.         }

  1199.         if (!(flags & SWS_ERROR_DIFFUSION) && (flags & SWS_FULL_CHR_H_INT)) {

  1200.             av_log(c, AV_LOG_DEBUG,

  1201.                 "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1202.                 av_get_pix_fmt_name(dstFormat));

  1203.             flags   |= SWS_ERROR_DIFFUSION;

  1204.             c->flags = flags;

  1205.         }

  1206.     }

  1207.     if (isPlanarRGB(dstFormat)) {

  1208.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1209.             av_log(c, AV_LOG_DEBUG,

  1210.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1211.                    av_get_pix_fmt_name(dstFormat));

  1212.             flags   |= SWS_FULL_CHR_H_INT;

  1213.             c->flags = flags;

  1214.         }

  1215.     }

  1216. 

  1217.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1218.      * chroma interpolation */

  1219.     if (flags & SWS_FULL_CHR_H_INT &&

  1220.         isAnyRGB(dstFormat)        &&

  1221.         !isPlanarRGB(dstFormat)    &&

  1222.         dstFormat != AV_PIX_FMT_RGBA  &&

  1223.         dstFormat != AV_PIX_FMT_ARGB  &&

  1224.         dstFormat != AV_PIX_FMT_BGRA  &&

  1225.         dstFormat != AV_PIX_FMT_ABGR  &&

  1226.         dstFormat != AV_PIX_FMT_RGB24 &&

  1227.         dstFormat != AV_PIX_FMT_BGR24 &&

  1228.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1229.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1230.         dstFormat != AV_PIX_FMT_BGR8 &&

  1231.         dstFormat != AV_PIX_FMT_RGB8

  1232.     ) {

  1233.         av_log(c, AV_LOG_WARNING,

  1234.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1235.                av_get_pix_fmt_name(dstFormat));

  1236.         flags   &= ~SWS_FULL_CHR_H_INT;

  1237.         c->flags = flags;

  1238.     }

  1239.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1240.         c->chrDstHSubSample = 1;

  1241. 

  1242.     // drop some chroma lines if the user wants it

  1243.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1244.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1245.     c->chrSrcVSubSample += c->vChrDrop;

  1246. 

  1247.     /* drop every other pixel for chroma calculation unless user

  1248.      * wants full chroma */

  1249.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1250.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1251.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1252.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1253.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1254.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1255.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1256.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1257.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1258.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1259.          (flags & SWS_FAST_BILINEAR)))

  1260.         c->chrSrcHSubSample = 1;

  1261. 

  1262.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1263.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1264.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1265.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1266.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1267. 

  1268.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1269. 

  1270.     /* unscaled special cases */

  1271.     if (unscaled && !usesHFilter && !usesVFilter &&

  1272.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1273.         ff_get_unscaled_swscale(c);

  1274. 

  1275.         if (c->swScale) {

  1276.             if (flags & SWS_PRINT_INFO)

  1277.                 av_log(c, AV_LOG_INFO,

  1278.                        "using unscaled %s -> %s special converter\n",

  1279.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1280.             return 0;

  1281.         }

  1282.     }

  1283. 

  1284.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1285.     if (c->srcBpc < 8)

  1286.         c->srcBpc = 8;

  1287.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1288.     if (c->dstBpc < 8)

  1289.         c->dstBpc = 8;

  1290.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1291.         c->srcBpc = 16;

  1292.     if (c->dstBpc == 16)

  1293.         dst_stride <<= 1;

  1294. 

  1295.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1296.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1297.                               (srcW & 15) == 0) ? 1 : 0;

  1298.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1299. 

  1300.             && (flags & SWS_FAST_BILINEAR)) {

  1301.             if (flags & SWS_PRINT_INFO)

  1302.                 av_log(c, AV_LOG_INFO,

  1303.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1304.         }

  1305.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1306.             c->canMMXEXTBeUsed = 0;

  1307.     } else

  1308.         c->canMMXEXTBeUsed = 0;

  1309. 

  1310.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1311.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1312. 

  1313.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1314.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1315.      * correct scaling.

  1316.      * n-2 is the last chrominance sample available.

  1317.      * This is not perfect, but no one should notice the difference, the more

  1318.      * correct variant would be like the vertical one, but that would require

  1319.      * some special code for the first and last pixel */

  1320.     if (flags & SWS_FAST_BILINEAR) {

  1321.         if (c->canMMXEXTBeUsed) {

  1322.             c->lumXInc += 20;

  1323.             c->chrXInc += 20;

  1324.         }

  1325.         // we don't use the x86 asm scaler if MMX is available

  1326.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1327.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1328.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1329.         }

  1330.     }

  1331. 

  1332. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1333. 

  1334.     /* precalculate horizontal scaler filter coefficients */

  1335.     {

  1336. #if HAVE_MMXEXT_INLINE

  1337. // can't downscale !!!

  1338.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1339.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1340.                                                              NULL, NULL, 8);

  1341.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1342.                                                              NULL, NULL, NULL, 4);

  1343. 

  1344. #if USE_MMAP

  1345.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1346.                                           PROT_READ | PROT_WRITE,

  1347.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1348.                                           -1, 0);

  1349.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1350.                                           PROT_READ | PROT_WRITE,

  1351.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1352.                                           -1, 0);

  1353. #elif HAVE_VIRTUALALLOC

  1354.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1355.                                                   c->lumMmxextFilterCodeSize,

  1356.                                                   MEM_COMMIT,

  1357.                                                   PAGE_EXECUTE_READWRITE);

  1358.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1359.                                                   c->chrMmxextFilterCodeSize,

  1360.                                                   MEM_COMMIT,

  1361.                                                   PAGE_EXECUTE_READWRITE);

  1362. #else

  1363.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1364.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1365. #endif

  1366. 

  1367. #ifdef MAP_ANONYMOUS

  1368.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1369. #else

  1370.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1371. #endif

  1372.             {

  1373.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1374.                 return AVERROR(ENOMEM);

  1375.             }

  1376. 

  1377.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1378.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1379.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1380.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1381. 

  1382.             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1383.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1384.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1385.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1386. 

  1387. #if USE_MMAP

  1388.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1389.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1390. #endif

  1391.         } else

  1392. #endif /* HAVE_MMXEXT_INLINE */

  1393.         {

  1394.             const int filterAlign =

  1395.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1396.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1397.                 1;

  1398. 

  1399.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1400.                            &c->hLumFilterSize, c->lumXInc,

  1401.                            srcW, dstW, filterAlign, 1 << 14,

  1402.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1403.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1404.                            c->param,

  1405.                            get_local_pos(c, 0, 0, 0),

  1406.                            get_local_pos(c, 0, 0, 0)) < 0)

  1407.                 goto fail;

  1408.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1409.                            &c->hChrFilterSize, c->chrXInc,

  1410.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1411.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1412.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1413.                            c->param,

  1414.                            get_local_pos(c, c->chrSrcHSubSample, c->src_h_chr_pos, 0),

  1415.                            get_local_pos(c, c->chrDstHSubSample, c->dst_h_chr_pos, 0)) < 0)

  1416.                 goto fail;

  1417.         }

  1418.     } // initialize horizontal stuff

  1419. 

  1420.     /* precalculate vertical scaler filter coefficients */

  1421.     {

  1422.         const int filterAlign =

  1423.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1424.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1425.             1;

  1426. 

  1427.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1428.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1429.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1430.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1431.                        c->param,

  1432.                        get_local_pos(c, 0, 0, 1),

  1433.                        get_local_pos(c, 0, 0, 1)) < 0)

  1434.             goto fail;

  1435.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1436.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1437.                        filterAlign, (1 << 12),

  1438.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1439.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1440.                        c->param,

  1441.                        get_local_pos(c, c->chrSrcVSubSample, c->src_v_chr_pos, 1),

  1442.                        get_local_pos(c, c->chrDstVSubSample, c->dst_v_chr_pos, 1)) < 0)

  1443. 

  1444.             goto fail;

  1445. 

  1446. #if HAVE_ALTIVEC

  1447.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1448.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1449. 

  1450.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1451.             int j;

  1452.             short *p = (short *)&c->vYCoeffsBank[i];

  1453.             for (j = 0; j < 8; j++)

  1454.                 p[j] = c->vLumFilter[i];

  1455.         }

  1456. 

  1457.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1458.             int j;

  1459.             short *p = (short *)&c->vCCoeffsBank[i];

  1460.             for (j = 0; j < 8; j++)

  1461.                 p[j] = c->vChrFilter[i];

  1462.         }

  1463. #endif

  1464.     }

  1465. 

  1466.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1467.     c->vLumBufSize = c->vLumFilterSize;

  1468.     c->vChrBufSize = c->vChrFilterSize;

  1469.     for (i = 0; i < dstH; i++) {

  1470.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1471.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1472.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1473.                                << c->chrSrcVSubSample));

  1474. 

  1475.         nextSlice >>= c->chrSrcVSubSample;

  1476.         nextSlice <<= c->chrSrcVSubSample;

  1477.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1478.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1479.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1480.             (nextSlice >> c->chrSrcVSubSample))

  1481.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1482.                              c->vChrFilterPos[chrI];

  1483.     }

  1484. 

  1485.     for (i = 0; i < 4; i++)

  1486.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1487. 

  1488.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1489.      * need to allocate several megabytes to handle all possible cases) */

  1490.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1491.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1492.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1493.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1494.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1495.     /* Note we need at least one pixel more at the end because of the MMX code

  1496.      * (just in case someone wants to replace the 4000/8000). */

  1497.     /* align at 16 bytes for AltiVec */

  1498.     for (i = 0; i < c->vLumBufSize; i++) {

  1499.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1500.                           dst_stride + 16, fail);

  1501.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1502.     }

  1503.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1504.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1505.     c->uv_offx2 = dst_stride + 16;

  1506.     for (i = 0; i < c->vChrBufSize; i++) {

  1507.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1508.                          dst_stride * 2 + 32, fail);

  1509.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1510.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1511.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1512.     }

  1513.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1514.         for (i = 0; i < c->vLumBufSize; i++) {

  1515.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1516.                               dst_stride + 16, fail);

  1517.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1518.         }

  1519. 

  1520.     // try to avoid drawing green stuff between the right end and the stride end

  1521.     for (i = 0; i < c->vChrBufSize; i++)

  1522.         if(desc_dst->comp[0].depth_minus1 == 15){

  1523.             av_assert0(c->dstBpc > 14);

  1524.             for(j=0; j<dst_stride/2+1; j++)

  1525.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1526.         } else

  1527.             for(j=0; j<dst_stride+1; j++)

  1528.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1529. 

  1530.     av_assert0(c->chrDstH <= dstH);

  1531. 

  1532.     if (flags & SWS_PRINT_INFO) {

  1533.         if (flags & SWS_FAST_BILINEAR)

  1534.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1535.         else if (flags & SWS_BILINEAR)

  1536.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1537.         else if (flags & SWS_BICUBIC)

  1538.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1539.         else if (flags & SWS_X)

  1540.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1541.         else if (flags & SWS_POINT)

  1542.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1543.         else if (flags & SWS_AREA)

  1544.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1545.         else if (flags & SWS_BICUBLIN)

  1546.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1547.         else if (flags & SWS_GAUSS)

  1548.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1549.         else if (flags & SWS_SINC)

  1550.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1551.         else if (flags & SWS_LANCZOS)

  1552.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1553.         else if (flags & SWS_SPLINE)

  1554.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1555.         else

  1556.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1557. 

  1558.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1559.                av_get_pix_fmt_name(srcFormat),

  1560. #ifdef DITHER1XBPP

  1561.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1562.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1563.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1564.                                                              "dithered " : "",

  1565. #else

  1566.                "",

  1567. #endif

  1568.                av_get_pix_fmt_name(dstFormat));

  1569. 

  1570.         if (INLINE_MMXEXT(cpu_flags))

  1571.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1572.         else if (INLINE_AMD3DNOW(cpu_flags))

  1573.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1574.         else if (INLINE_MMX(cpu_flags))

  1575.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1576.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1577.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1578.         else

  1579.             av_log(c, AV_LOG_INFO, "using C\n");

  1580. 

  1581.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1582.         av_log(c, AV_LOG_DEBUG,

  1583.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1584.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1585.         av_log(c, AV_LOG_DEBUG,

  1586.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1587.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1588.                c->chrXInc, c->chrYInc);

  1589.     }

  1590. 

  1591.     c->swScale = ff_getSwsFunc(c);

  1592.     return 0;

  1593. fail: // FIXME replace things by appropriate error codes

  1594.     return -1;

  1595. }

  1596. 

  1597. #if FF_API_SWS_GETCONTEXT

  1598. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1599.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1600.                            int flags, SwsFilter *srcFilter,

  1601.                            SwsFilter *dstFilter, const double *param)

  1602. {

  1603.     SwsContext *c;

  1604. 

  1605.     if (!(c = sws_alloc_context()))

  1606.         return NULL;

  1607. 

  1608.     c->flags     = flags;

  1609.     c->srcW      = srcW;

  1610.     c->srcH      = srcH;

  1611.     c->dstW      = dstW;

  1612.     c->dstH      = dstH;

  1613.     c->srcFormat = srcFormat;

  1614.     c->dstFormat = dstFormat;

  1615. 

  1616.     if (param) {

  1617.         c->param[0] = param[0];

  1618.         c->param[1] = param[1];

  1619.     }

  1620. 

  1621.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1622.         sws_freeContext(c);

  1623.         return NULL;

  1624.     }

  1625. 

  1626.     return c;

  1627. }

  1628. #endif

  1629. 

  1630. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1631.                                 float lumaSharpen, float chromaSharpen,

  1632.                                 float chromaHShift, float chromaVShift,

  1633.                                 int verbose)

  1634. {

  1635.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1636.     if (!filter)

  1637.         return NULL;

  1638. 

  1639.     if (lumaGBlur != 0.0) {

  1640.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1641.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1642.     } else {

  1643.         filter->lumH = sws_getIdentityVec();

  1644.         filter->lumV = sws_getIdentityVec();

  1645.     }

  1646. 

  1647.     if (chromaGBlur != 0.0) {

  1648.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1649.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1650.     } else {

  1651.         filter->chrH = sws_getIdentityVec();

  1652.         filter->chrV = sws_getIdentityVec();

  1653.     }

  1654. 

  1655.     if (chromaSharpen != 0.0) {

  1656.         SwsVector *id = sws_getIdentityVec();

  1657.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1658.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1659.         sws_addVec(filter->chrH, id);

  1660.         sws_addVec(filter->chrV, id);

  1661.         sws_freeVec(id);

  1662.     }

  1663. 

  1664.     if (lumaSharpen != 0.0) {

  1665.         SwsVector *id = sws_getIdentityVec();

  1666.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1667.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1668.         sws_addVec(filter->lumH, id);

  1669.         sws_addVec(filter->lumV, id);

  1670.         sws_freeVec(id);

  1671.     }

  1672. 

  1673.     if (chromaHShift != 0.0)

  1674.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1675. 

  1676.     if (chromaVShift != 0.0)

  1677.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1678. 

  1679.     sws_normalizeVec(filter->chrH, 1.0);

  1680.     sws_normalizeVec(filter->chrV, 1.0);

  1681.     sws_normalizeVec(filter->lumH, 1.0);

  1682.     sws_normalizeVec(filter->lumV, 1.0);

  1683. 

  1684.     if (verbose)

  1685.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1686.     if (verbose)

  1687.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1688. 

  1689.     return filter;

  1690. }

  1691. 

  1692. SwsVector *sws_allocVec(int length)

  1693. {

  1694.     SwsVector *vec;

  1695. 

  1696.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1697.         return NULL;

  1698. 

  1699.     vec = av_malloc(sizeof(SwsVector));

  1700.     if (!vec)

  1701.         return NULL;

  1702.     vec->length = length;

  1703.     vec->coeff  = av_malloc(sizeof(double) * length);

  1704.     if (!vec->coeff)

  1705.         av_freep(&vec);

  1706.     return vec;

  1707. }

  1708. 

  1709. SwsVector *sws_getGaussianVec(double variance, double quality)

  1710. {

  1711.     const int length = (int)(variance * quality + 0.5) | 1;

  1712.     int i;

  1713.     double middle  = (length - 1) * 0.5;

  1714.     SwsVector *vec;

  1715. 

  1716.     if(variance < 0 || quality < 0)

  1717.         return NULL;

  1718. 

  1719.     vec = sws_allocVec(length);

  1720. 

  1721.     if (!vec)

  1722.         return NULL;

  1723. 

  1724.     for (i = 0; i < length; i++) {

  1725.         double dist = i - middle;

  1726.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1727.                         sqrt(2 * variance * M_PI);

  1728.     }

  1729. 

  1730.     sws_normalizeVec(vec, 1.0);

  1731. 

  1732.     return vec;

  1733. }

  1734. 

  1735. SwsVector *sws_getConstVec(double c, int length)

  1736. {

  1737.     int i;

  1738.     SwsVector *vec = sws_allocVec(length);

  1739. 

  1740.     if (!vec)

  1741.         return NULL;

  1742. 

  1743.     for (i = 0; i < length; i++)

  1744.         vec->coeff[i] = c;

  1745. 

  1746.     return vec;

  1747. }

  1748. 

  1749. SwsVector *sws_getIdentityVec(void)

  1750. {

  1751.     return sws_getConstVec(1.0, 1);

  1752. }

  1753. 

  1754. static double sws_dcVec(SwsVector *a)

  1755. {

  1756.     int i;

  1757.     double sum = 0;

  1758. 

  1759.     for (i = 0; i < a->length; i++)

  1760.         sum += a->coeff[i];

  1761. 

  1762.     return sum;

  1763. }

  1764. 

  1765. void sws_scaleVec(SwsVector *a, double scalar)

  1766. {

  1767.     int i;

  1768. 

  1769.     for (i = 0; i < a->length; i++)

  1770.         a->coeff[i] *= scalar;

  1771. }

  1772. 

  1773. void sws_normalizeVec(SwsVector *a, double height)

  1774. {

  1775.     sws_scaleVec(a, height / sws_dcVec(a));

  1776. }

  1777. 

  1778. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1779. {

  1780.     int length = a->length + b->length - 1;

  1781.     int i, j;

  1782.     SwsVector *vec = sws_getConstVec(0.0, length);

  1783. 

  1784.     if (!vec)

  1785.         return NULL;

  1786. 

  1787.     for (i = 0; i < a->length; i++) {

  1788.         for (j = 0; j < b->length; j++) {

  1789.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1790.         }

  1791.     }

  1792. 

  1793.     return vec;

  1794. }

  1795. 

  1796. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1797. {

  1798.     int length = FFMAX(a->length, b->length);

  1799.     int i;

  1800.     SwsVector *vec = sws_getConstVec(0.0, length);

  1801. 

  1802.     if (!vec)

  1803.         return NULL;

  1804. 

  1805.     for (i = 0; i < a->length; i++)

  1806.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1807.     for (i = 0; i < b->length; i++)

  1808.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1809. 

  1810.     return vec;

  1811. }

  1812. 

  1813. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1814. {

  1815.     int length = FFMAX(a->length, b->length);

  1816.     int i;

  1817.     SwsVector *vec = sws_getConstVec(0.0, length);

  1818. 

  1819.     if (!vec)

  1820.         return NULL;

  1821. 

  1822.     for (i = 0; i < a->length; i++)

  1823.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1824.     for (i = 0; i < b->length; i++)

  1825.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1826. 

  1827.     return vec;

  1828. }

  1829. 

  1830. /* shift left / or right if "shift" is negative */

  1831. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1832. {

  1833.     int length = a->length + FFABS(shift) * 2;

  1834.     int i;

  1835.     SwsVector *vec = sws_getConstVec(0.0, length);

  1836. 

  1837.     if (!vec)

  1838.         return NULL;

  1839. 

  1840.     for (i = 0; i < a->length; i++) {

  1841.         vec->coeff[i + (length    - 1) / 2 -

  1842.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1843.     }

  1844. 

  1845.     return vec;

  1846. }

  1847. 

  1848. void sws_shiftVec(SwsVector *a, int shift)

  1849. {

  1850.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1851.     av_free(a->coeff);

  1852.     a->coeff  = shifted->coeff;

  1853.     a->length = shifted->length;

  1854.     av_free(shifted);

  1855. }

  1856. 

  1857. void sws_addVec(SwsVector *a, SwsVector *b)

  1858. {

  1859.     SwsVector *sum = sws_sumVec(a, b);

  1860.     av_free(a->coeff);

  1861.     a->coeff  = sum->coeff;

  1862.     a->length = sum->length;

  1863.     av_free(sum);

  1864. }

  1865. 

  1866. void sws_subVec(SwsVector *a, SwsVector *b)

  1867. {

  1868.     SwsVector *diff = sws_diffVec(a, b);

  1869.     av_free(a->coeff);

  1870.     a->coeff  = diff->coeff;

  1871.     a->length = diff->length;

  1872.     av_free(diff);

  1873. }

  1874. 

  1875. void sws_convVec(SwsVector *a, SwsVector *b)

  1876. {

  1877.     SwsVector *conv = sws_getConvVec(a, b);

  1878.     av_free(a->coeff);

  1879.     a->coeff  = conv->coeff;

  1880.     a->length = conv->length;

  1881.     av_free(conv);

  1882. }

  1883. 

  1884. SwsVector *sws_cloneVec(SwsVector *a)

  1885. {

  1886.     int i;

  1887.     SwsVector *vec = sws_allocVec(a->length);

  1888. 

  1889.     if (!vec)

  1890.         return NULL;

  1891. 

  1892.     for (i = 0; i < a->length; i++)

  1893.         vec->coeff[i] = a->coeff[i];

  1894. 

  1895.     return vec;

  1896. }

  1897. 

  1898. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1899. {

  1900.     int i;

  1901.     double max = 0;

  1902.     double min = 0;

  1903.     double range;

  1904. 

  1905.     for (i = 0; i < a->length; i++)

  1906.         if (a->coeff[i] > max)

  1907.             max = a->coeff[i];

  1908. 

  1909.     for (i = 0; i < a->length; i++)

  1910.         if (a->coeff[i] < min)

  1911.             min = a->coeff[i];

  1912. 

  1913.     range = max - min;

  1914. 

  1915.     for (i = 0; i < a->length; i++) {

  1916.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1917.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1918.         for (; x > 0; x--)

  1919.             av_log(log_ctx, log_level, " ");

  1920.         av_log(log_ctx, log_level, "|\n");

  1921.     }

  1922. }

  1923. 

  1924. void sws_freeVec(SwsVector *a)

  1925. {

  1926.     if (!a)

  1927.         return;

  1928.     av_freep(&a->coeff);

  1929.     a->length = 0;

  1930.     av_free(a);

  1931. }

  1932. 

  1933. void sws_freeFilter(SwsFilter *filter)

  1934. {

  1935.     if (!filter)

  1936.         return;

  1937. 

  1938.     if (filter->lumH)

  1939.         sws_freeVec(filter->lumH);

  1940.     if (filter->lumV)

  1941.         sws_freeVec(filter->lumV);

  1942.     if (filter->chrH)

  1943.         sws_freeVec(filter->chrH);

  1944.     if (filter->chrV)

  1945.         sws_freeVec(filter->chrV);

  1946.     av_free(filter);

  1947. }

  1948. 

  1949. void sws_freeContext(SwsContext *c)

  1950. {

  1951.     int i;

  1952.     if (!c)

  1953.         return;

  1954. 

  1955.     if (c->lumPixBuf) {

  1956.         for (i = 0; i < c->vLumBufSize; i++)

  1957.             av_freep(&c->lumPixBuf[i]);

  1958.         av_freep(&c->lumPixBuf);

  1959.     }

  1960. 

  1961.     if (c->chrUPixBuf) {

  1962.         for (i = 0; i < c->vChrBufSize; i++)

  1963.             av_freep(&c->chrUPixBuf[i]);

  1964.         av_freep(&c->chrUPixBuf);

  1965.         av_freep(&c->chrVPixBuf);

  1966.     }

  1967. 

  1968.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1969.         for (i = 0; i < c->vLumBufSize; i++)

  1970.             av_freep(&c->alpPixBuf[i]);

  1971.         av_freep(&c->alpPixBuf);

  1972.     }

  1973. 

  1974.     for (i = 0; i < 4; i++)

  1975.         av_freep(&c->dither_error[i]);

  1976. 

  1977.     av_freep(&c->vLumFilter);

  1978.     av_freep(&c->vChrFilter);

  1979.     av_freep(&c->hLumFilter);

  1980.     av_freep(&c->hChrFilter);

  1981. #if HAVE_ALTIVEC

  1982.     av_freep(&c->vYCoeffsBank);

  1983.     av_freep(&c->vCCoeffsBank);

  1984. #endif

  1985. 

  1986.     av_freep(&c->vLumFilterPos);

  1987.     av_freep(&c->vChrFilterPos);

  1988.     av_freep(&c->hLumFilterPos);

  1989.     av_freep(&c->hChrFilterPos);

  1990. 

  1991. #if HAVE_MMX_INLINE

  1992. #if USE_MMAP

  1993.     if (c->lumMmxextFilterCode)

  1994.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1995.     if (c->chrMmxextFilterCode)

  1996.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1997. #elif HAVE_VIRTUALALLOC

  1998.     if (c->lumMmxextFilterCode)

  1999.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  2000.     if (c->chrMmxextFilterCode)

  2001.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  2002. #else

  2003.     av_free(c->lumMmxextFilterCode);

  2004.     av_free(c->chrMmxextFilterCode);

  2005. #endif

  2006.     c->lumMmxextFilterCode = NULL;

  2007.     c->chrMmxextFilterCode = NULL;

  2008. #endif /* HAVE_MMX_INLINE */

  2009. 

  2010.     av_freep(&c->yuvTable);

  2011.     av_freep(&c->formatConvBuffer);

  2012. 

  2013.     av_free(c);

  2014. }

  2015. 

  2016. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  2017.                                         int srcH, enum AVPixelFormat srcFormat,

  2018.                                         int dstW, int dstH,

  2019.                                         enum AVPixelFormat dstFormat, int flags,

  2020.                                         SwsFilter *srcFilter,

  2021.                                         SwsFilter *dstFilter,

  2022.                                         const double *param)

  2023. {

  2024.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  2025.                                              SWS_PARAM_DEFAULT };

  2026. 

  2027.     if (!param)

  2028.         param = default_param;

  2029. 

  2030.     if (context &&

  2031.         (context->srcW      != srcW      ||

  2032.          context->srcH      != srcH      ||

  2033.          context->srcFormat != srcFormat ||

  2034.          context->dstW      != dstW      ||

  2035.          context->dstH      != dstH      ||

  2036.          context->dstFormat != dstFormat ||

  2037.          context->flags     != flags     ||

  2038.          context->param[0]  != param[0]  ||

  2039.          context->param[1]  != param[1])) {

  2040.         sws_freeContext(context);

  2041.         context = NULL;

  2042.     }

  2043. 

  2044.     if (!context) {

  2045.         if (!(context = sws_alloc_context()))

  2046.             return NULL;

  2047.         context->srcW      = srcW;

  2048.         context->srcH      = srcH;

  2049.         context->srcFormat = srcFormat;

  2050.         context->dstW      = dstW;

  2051.         context->dstH      = dstH;

  2052.         context->dstFormat = dstFormat;

  2053.         context->flags     = flags;

  2054.         context->param[0]  = param[0];

  2055.         context->param[1]  = param[1];

  2056.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2057.             sws_freeContext(context);

  2058.             return NULL;

  2059.         }

  2060.     }

  2061.     return context;

  2062. }