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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. unsigned swscale_version(void)

  56. {

  57.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  58.     return LIBSWSCALE_VERSION_INT;

  59. }

  60. 

  61. const char *swscale_configuration(void)

  62. {

  63.     return FFMPEG_CONFIGURATION;

  64. }

  65. 

  66. const char *swscale_license(void)

  67. {

  68. #define LICENSE_PREFIX "libswscale license: "

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

  70. }

  71. 

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

  73. 

  74. typedef struct FormatEntry {

  75.     uint8_t is_supported_in         :1;

  76.     uint8_t is_supported_out        :1;

  77.     uint8_t is_supported_endianness :1;

  78. } FormatEntry;

  79. 

  80. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  141.     [AV_PIX_FMT_RGBA64BE]    = { 1, 0, 1 },

  142.     [AV_PIX_FMT_RGBA64LE]    = { 1, 0, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  206. };

  207. 

  208. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  209. {

  210.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  211.            format_entries[pix_fmt].is_supported_in : 0;

  212. }

  213. 

  214. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  215. {

  216.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  217.            format_entries[pix_fmt].is_supported_out : 0;

  218. }

  219. 

  220. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  221. {

  222.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  223.            format_entries[pix_fmt].is_supported_endianness : 0;

  224. }

  225. 

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

  227. 

  228. #if FF_API_SWS_FORMAT_NAME

  229. const char *sws_format_name(enum AVPixelFormat format)

  230. {

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

  232.     if (desc)

  233.         return desc->name;

  234.     else

  235.         return "Unknown format";

  236. }

  237. #endif

  238. 

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

  240.                              double dist)

  241. {

  242.     if (dist <= 1.0)

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

  244.     else

  245.         return getSplineCoeff(0.0,

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

  247.                                c + 3.0 * d,

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

  249.                               dist - 1.0);

  250. }

  251. 

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

  253.                               int *outFilterSize, int xInc, int srcW,

  254.                               int dstW, int filterAlign, int one,

  255.                               int flags, int cpu_flags,

  256.                               SwsVector *srcFilter, SwsVector *dstFilter,

  257.                               double param[2])

  258. {

  259.     int i;

  260.     int filterSize;

  261.     int filter2Size;

  262.     int minFilterSize;

  263.     int64_t *filter    = NULL;

  264.     int64_t *filter2   = NULL;

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

  266.     int ret            = -1;

  267. 

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

  269. 

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

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

  272. 

  273.     if (FFABS(xInc - 0x10000) < 10) { // unscaled

  274.         int i;

  275.         filterSize = 1;

  276.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  278. 

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

  280.             filter[i * filterSize] = fone;

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

  282.         }

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

  284.         int i;

  285.         int64_t xDstInSrc;

  286.         filterSize = 1;

  287.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  289. 

  290.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  293. 

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

  295.             filter[i]       = fone;

  296.             xDstInSrc      += xInc;

  297.         }

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

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

  300.         int i;

  301.         int64_t xDstInSrc;

  302.         filterSize = 2;

  303.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  305. 

  306.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  309.             int j;

  310. 

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

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

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

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

  315.                 if (coeff < 0)

  316.                     coeff = 0;

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

  318.                 xx++;

  319.             }

  320.             xDstInSrc += xInc;

  321.         }

  322.     } else {

  323.         int64_t xDstInSrc;

  324.         int sizeFactor;

  325. 

  326.         if (flags & SWS_BICUBIC)

  327.             sizeFactor = 4;

  328.         else if (flags & SWS_X)

  329.             sizeFactor = 8;

  330.         else if (flags & SWS_AREA)

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

  332.         else if (flags & SWS_GAUSS)

  333.             sizeFactor = 8;     // infinite ;)

  334.         else if (flags & SWS_LANCZOS)

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

  336.         else if (flags & SWS_SINC)

  337.             sizeFactor = 20;    // infinite ;)

  338.         else if (flags & SWS_SPLINE)

  339.             sizeFactor = 20;    // infinite ;)

  340.         else if (flags & SWS_BILINEAR)

  341.             sizeFactor = 2;

  342.         else {

  343.             av_assert0(0);

  344.         }

  345. 

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

  347.             filterSize = 1 + sizeFactor;    // upscale

  348.         else

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

  350. 

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

  352.         filterSize = FFMAX(filterSize, 1);

  353. 

  354.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  356. 

  357.         xDstInSrc = xInc - 0x10000;

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

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

  360.             int j;

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

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

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

  364.                 double floatd;

  365.                 int64_t coeff;

  366. 

  367.                 if (xInc > 1 << 16)

  368.                     d = d * dstW / srcW;

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

  370. 

  371.                 if (flags & SWS_BICUBIC) {

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

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

  374. 

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

  376.                         coeff = 0.0;

  377.                     } else {

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

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

  380. 

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

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

  383.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  384.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  385.                         else

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

  387.                                       (6 * B + 30 * C) * dd  +

  388.                                     (-12 * B - 48 * C) * d   +

  389.                                       (8 * B + 24 * C) * (1 << 30);

  390.                     }

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

  392.                 }

  393. #if 0

  394.                 else if (flags & SWS_X) {

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

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

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

  398.                 }

  399. #endif

  400.                 else if (flags & SWS_X) {

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

  402.                     double c;

  403. 

  404.                     if (floatd < 1.0)

  405.                         c = cos(floatd * M_PI);

  406.                     else

  407.                         c = -1.0;

  408.                     if (c < 0.0)

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

  410.                     else

  411.                         c = pow(c, A);

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

  413.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  419.                     else

  420.                         coeff = 0.0;

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

  422.                 } else if (flags & SWS_GAUSS) {

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

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

  425.                 } else if (flags & SWS_SINC) {

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

  427.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  431.                     if (floatd > p)

  432.                         coeff = 0;

  433.                 } else if (flags & SWS_BILINEAR) {

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

  435.                     if (coeff < 0)

  436.                         coeff = 0;

  437.                     coeff *= fone >> 30;

  438.                 } else if (flags & SWS_SPLINE) {

  439.                     double p = -2.196152422706632;

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

  441.                 } else {

  442.                     av_assert0(0);

  443.                 }

  444. 

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

  446.                 xx++;

  447.             }

  448.             xDstInSrc += 2 * xInc;

  449.         }

  450.     }

  451. 

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

  453.      * av_free(filter);

  454.      */

  455.     av_assert0(filterSize > 0);

  456.     filter2Size = filterSize;

  457.     if (srcFilter)

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

  459.     if (dstFilter)

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

  461.     av_assert0(filter2Size > 0);

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

  463. 

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

  465.         int j, k;

  466. 

  467.         if (srcFilter) {

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

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

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

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

  472.             }

  473.         } else {

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

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

  476.         }

  477.         // FIXME dstFilter

  478. 

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

  480.     }

  481.     av_freep(&filter);

  482. 

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

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

  485.     minFilterSize = 0;

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

  487.         int min = filter2Size;

  488.         int j;

  489.         int64_t cutOff = 0.0;

  490. 

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

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

  493.             int k;

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

  495. 

  496.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  497.                 break;

  498. 

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

  500.              * filter otherwise */

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

  502.                 break;

  503. 

  504.             // move filter coefficients left

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

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

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

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

  509.         }

  510. 

  511.         cutOff = 0;

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

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

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

  515. 

  516.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  517.                 break;

  518.             min--;

  519.         }

  520. 

  521.         if (min > minFilterSize)

  522.             minFilterSize = min;

  523.     }

  524. 

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

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

  527.         if (minFilterSize < 5)

  528.             filterAlign = 4;

  529. 

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

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

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

  533.         if (minFilterSize < 3)

  534.             filterAlign = 1;

  535.     }

  536. 

  537.     if (INLINE_MMX(cpu_flags)) {

  538.         // special case for unscaled vertical filtering

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

  540.             filterAlign = 1;

  541.     }

  542. 

  543.     av_assert0(minFilterSize > 0);

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

  545.     av_assert0(filterSize > 0);

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

  547.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  549.         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);

  550.         goto fail;

  551.     }

  552.     *outFilterSize = filterSize;

  553. 

  554.     if (flags & SWS_PRINT_INFO)

  555.         av_log(NULL, AV_LOG_VERBOSE,

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

  557.                filter2Size, filterSize);

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

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

  560.         int j;

  561. 

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

  563.             if (j >= filter2Size)

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

  565.             else

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

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

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

  569.         }

  570.     }

  571. 

  572.     // FIXME try to align filterPos if possible

  573. 

  574.     // fix borders

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

  576.         int j;

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

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

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

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

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

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

  583.             }

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

  585.         }

  586. 

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

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

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

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

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

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

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

  594.             }

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

  596.         }

  597.     }

  598. 

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

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

  601.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  603. 

  604.     /* normalize & store in outFilter */

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

  606.         int j;

  607.         int64_t error = 0;

  608.         int64_t sum   = 0;

  609. 

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

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

  612.         }

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

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

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

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

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

  618.             error                                  = v - intV * sum;

  619.         }

  620.     }

  621. 

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

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

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

  625.                                                       * read over the end */

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

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

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

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

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

  631.     }

  632. 

  633.     ret = 0;

  634. 

  635. fail:

  636.     if(ret < 0)

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

  638.     av_free(filter);

  639.     av_free(filter2);

  640.     return ret;

  641. }

  642. 

  643. #if HAVE_MMXEXT_INLINE

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

  645.                                        int16_t *filter, int32_t *filterPos,

  646.                                        int numSplits)

  647. {

  648.     uint8_t *fragmentA;

  649.     x86_reg imm8OfPShufW1A;

  650.     x86_reg imm8OfPShufW2A;

  651.     x86_reg fragmentLengthA;

  652.     uint8_t *fragmentB;

  653.     x86_reg imm8OfPShufW1B;

  654.     x86_reg imm8OfPShufW2B;

  655.     x86_reg fragmentLengthB;

  656.     int fragmentPos;

  657. 

  658.     int xpos, i;

  659. 

  660.     // create an optimized horizontal scaling routine

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

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

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

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

  665.      */

  666. 

  667.     // code fragment

  668. 

  669.     __asm__ volatile (

  670.         "jmp                         9f                 \n\t"

  671.         // Begin

  672.         "0:                                             \n\t"

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

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

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

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

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

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

  679.         "1:                                             \n\t"

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

  681.         "2:                                             \n\t"

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

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

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

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

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

  687. 

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

  689. 

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

  691.         // End

  692.         "9:                                             \n\t"

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

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

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

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

  697.         "dec                         %1                 \n\t"

  698.         "dec                         %2                 \n\t"

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

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

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

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

  703. 

  704. 

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

  706.           "=r" (fragmentLengthA)

  707.         );

  708. 

  709.     __asm__ volatile (

  710.         "jmp                         9f                 \n\t"

  711.         // Begin

  712.         "0:                                             \n\t"

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

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

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

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

  717.         "1:                                             \n\t"

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

  719.         "2:                                             \n\t"

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

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

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

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

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

  725. 

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

  727. 

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

  729.         // End

  730.         "9:                                             \n\t"

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

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

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

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

  735.         "dec                         %1                 \n\t"

  736.         "dec                         %2                 \n\t"

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

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

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

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

  741. 

  742. 

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

  744.           "=r" (fragmentLengthB)

  745.         );

  746. 

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

  748.     fragmentPos = 0;

  749. 

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

  751.         int xx = xpos >> 16;

  752. 

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

  754.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  764.             int shift              = 0;

  765. 

  766.             if (filterCode) {

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

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

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

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

  771.                 filterPos[i / 2] = xx;

  772. 

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

  774. 

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

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

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

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

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

  780.                                                                (c << 4) |

  781.                                                                (d << 6);

  782. 

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

  784.                     shift = maxShift;               // avoid overread

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

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

  787. 

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

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

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

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

  792.                 }

  793.             }

  794. 

  795.             fragmentPos += fragmentLength;

  796. 

  797.             if (filterCode)

  798.                 filterCode[fragmentPos] = RET;

  799.         }

  800.         xpos += xInc;

  801.     }

  802.     if (filterCode)

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

  804. 

  805.     return fragmentPos + 1;

  806. }

  807. #endif /* HAVE_MMXEXT_INLINE */

  808. 

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

  810. {

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

  812.     *h = desc->log2_chroma_w;

  813.     *v = desc->log2_chroma_h;

  814. }

  815. 

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

  817. {

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

  819.     int64_t vr =  table[0];

  820.     int64_t ub =  table[1];

  821.     int64_t ug = -table[2];

  822.     int64_t vg = -table[3];

  823.     int64_t ONE = 65536;

  824.     int64_t cy = ONE;

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

  826.     int i;

  827.     static const int8_t map[] = {

  828.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

  829.     RY_IDX, -1    , GY_IDX, RY_IDX, RY_IDX, -1    , GY_IDX, RY_IDX,

  830.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  831.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  832.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

  833.     RU_IDX, -1    , GU_IDX, RU_IDX, RU_IDX, -1    , GU_IDX, RU_IDX,

  834.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  835.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  836.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

  837.     RV_IDX, -1    , GV_IDX, RV_IDX, RV_IDX, -1    , GV_IDX, RV_IDX,

  838.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  839.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

  840.     RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX,

  841.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

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

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

  844.     RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX,

  845.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

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

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

  848.     RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX,

  849.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

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

  851.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  852.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  853.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  854.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  855.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  856.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  857.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  858.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  859.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  863.     };

  864. 

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

  866. 

  867.     if (!dstRange) {

  868.         cy = cy * 255 / 219;

  869.     } else {

  870.         vr = vr * 224 / 255;

  871.         ub = ub * 224 / 255;

  872.         ug = ug * 224 / 255;

  873.         vg = vg * 224 / 255;

  874.     }

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

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

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

  878. 

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

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

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

  882. 

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

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

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

  886. 

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

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

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

  890. 

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

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

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

  894. 

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

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

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

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

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

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

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

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

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

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

  905.     }

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

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

  908. }

  909. 

  910. static void fill_xyztables(struct SwsContext *c)

  911. {

  912.     int i;

  913.     double xyzgamma = XYZ_GAMMA;

  914.     double rgbgamma = 1.0 / RGB_GAMMA;

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

  916.         {13270, -6295, -2041},

  917.         {-3969,  7682,   170},

  918.         {  228,  -835,  4329} };

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

  920. 

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

  922.     c->xyzgamma = xyzgamma_tab;

  923.     c->rgbgamma = rgbgamma_tab;

  924. 

  925.     if (rgbgamma_tab[4095])

  926.         return;

  927. 

  928.     /* set gamma vectors */

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

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

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

  932.     }

  933. }

  934. 

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

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

  937.                              int brightness, int contrast, int saturation)

  938. {

  939.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);

  940.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);

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

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

  943. 

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

  945.         dstRange = 0;

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

  947.         srcRange = 0;

  948. 

  949.     c->brightness = brightness;

  950.     c->contrast   = contrast;

  951.     c->saturation = saturation;

  952.     c->srcRange   = srcRange;

  953.     c->dstRange   = dstRange;

  954. 

  955.     fill_xyztables(c);

  956. 

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

  958.         return -1;

  959. 

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

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

  962. 

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

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

  965.                              contrast, saturation);

  966.     // FIXME factorize

  967. 

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

  969.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  970.                                        contrast, saturation);

  971.     }

  972. 

  973.     fill_rgb2yuv_table(c, table, dstRange);

  974. 

  975.     return 0;

  976. }

  977. 

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

  979.                              int *srcRange, int **table, int *dstRange,

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

  981. {

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

  983.         return -1;

  984. 

  985.     *inv_table  = c->srcColorspaceTable;

  986.     *table      = c->dstColorspaceTable;

  987.     *srcRange   = c->srcRange;

  988.     *dstRange   = c->dstRange;

  989.     *brightness = c->brightness;

  990.     *contrast   = c->contrast;

  991.     *saturation = c->saturation;

  992. 

  993.     return 0;

  994. }

  995. 

  996. static int handle_jpeg(enum AVPixelFormat *format)

  997. {

  998.     switch (*format) {

  999.     case AV_PIX_FMT_YUVJ420P:

  1000.         *format = AV_PIX_FMT_YUV420P;

  1001.         return 1;

  1002.     case AV_PIX_FMT_YUVJ422P:

  1003.         *format = AV_PIX_FMT_YUV422P;

  1004.         return 1;

  1005.     case AV_PIX_FMT_YUVJ444P:

  1006.         *format = AV_PIX_FMT_YUV444P;

  1007.         return 1;

  1008.     case AV_PIX_FMT_YUVJ440P:

  1009.         *format = AV_PIX_FMT_YUV440P;

  1010.         return 1;

  1011.     default:

  1012.         return 0;

  1013.     }

  1014. }

  1015. 

  1016. static int handle_0alpha(enum AVPixelFormat *format)

  1017. {

  1018.     switch (*format) {

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

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

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

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

  1023.     default:                                          return 0;

  1024.     }

  1025. }

  1026. 

  1027. static int handle_xyz(enum AVPixelFormat *format)

  1028. {

  1029.     switch (*format) {

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

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

  1032.     default:                                                return 0;

  1033.     }

  1034. }

  1035. 

  1036. SwsContext *sws_alloc_context(void)

  1037. {

  1038.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1039. 

  1040.     if (c) {

  1041.         c->av_class = &sws_context_class;

  1042.         av_opt_set_defaults(c);

  1043.     }

  1044. 

  1045.     return c;

  1046. }

  1047. 

  1048. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1049.                              SwsFilter *dstFilter)

  1050. {

  1051.     int i, j;

  1052.     int usesVFilter, usesHFilter;

  1053.     int unscaled;

  1054.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1055.     int srcW              = c->srcW;

  1056.     int srcH              = c->srcH;

  1057.     int dstW              = c->dstW;

  1058.     int dstH              = c->dstH;

  1059.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1060.     int flags, cpu_flags;

  1061.     enum AVPixelFormat srcFormat = c->srcFormat;

  1062.     enum AVPixelFormat dstFormat = c->dstFormat;

  1063.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);

  1064.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);

  1065. 

  1066.     cpu_flags = av_get_cpu_flags();

  1067.     flags     = c->flags;

  1068.     emms_c();

  1069.     if (!rgb15to16)

  1070.         sws_rgb2rgb_init();

  1071. 

  1072.     unscaled = (srcW == dstW && srcH == dstH);

  1073. 

  1074.     handle_jpeg(&srcFormat);

  1075.     handle_jpeg(&dstFormat);

  1076.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1077.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1078.     handle_0alpha(&srcFormat);

  1079.     handle_0alpha(&dstFormat);

  1080.     handle_xyz(&srcFormat);

  1081.     handle_xyz(&dstFormat);

  1082. 

  1083.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){

  1084.         c->srcFormat= srcFormat;

  1085.         c->dstFormat= dstFormat;

  1086.     }

  1087. 

  1088.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1089.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1090.     if (!sws_isSupportedInput(srcFormat)) {

  1091.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1092.                av_get_pix_fmt_name(srcFormat));

  1093.         return AVERROR(EINVAL);

  1094.     }

  1095.     if (!sws_isSupportedOutput(dstFormat)) {

  1096.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1097.                av_get_pix_fmt_name(dstFormat));

  1098.         return AVERROR(EINVAL);

  1099.     }

  1100.     }

  1101. 

  1102.     i = flags & (SWS_POINT         |

  1103.                  SWS_AREA          |

  1104.                  SWS_BILINEAR      |

  1105.                  SWS_FAST_BILINEAR |

  1106.                  SWS_BICUBIC       |

  1107.                  SWS_X             |

  1108.                  SWS_GAUSS         |

  1109.                  SWS_LANCZOS       |

  1110.                  SWS_SINC          |

  1111.                  SWS_SPLINE        |

  1112.                  SWS_BICUBLIN);

  1113.     if (!i || (i & (i - 1))) {

  1114.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1115.         return AVERROR(EINVAL);

  1116.     }

  1117.     /* sanity check */

  1118.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1119.         /* FIXME check if these are enough and try to lower them after

  1120.          * fixing the relevant parts of the code */

  1121.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1122.                srcW, srcH, dstW, dstH);

  1123.         return AVERROR(EINVAL);

  1124.     }

  1125. 

  1126.     if (!dstFilter)

  1127.         dstFilter = &dummyFilter;

  1128.     if (!srcFilter)

  1129.         srcFilter = &dummyFilter;

  1130. 

  1131.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1132.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1133.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1134.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1135.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1136. 

  1137.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

  1138.                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||

  1139.                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||

  1140.                   (dstFilter->chrV && dstFilter->chrV->length > 1);

  1141.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1142.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1143.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1144.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1145. 

  1146.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  1147.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  1148. 

  1149.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1150.         if (dstW&1) {

  1151.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1152.             flags |= SWS_FULL_CHR_H_INT;

  1153.             c->flags = flags;

  1154.         }

  1155.     }

  1156. 

  1157.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1158.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1159.        dstFormat == AV_PIX_FMT_BGR8 ||

  1160.        dstFormat == AV_PIX_FMT_RGB8) {

  1161.         if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {

  1162.             av_log(c, AV_LOG_DEBUG,

  1163.                 "Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",

  1164.                 av_get_pix_fmt_name(dstFormat));

  1165.             flags   |= SWS_FULL_CHR_H_INT;

  1166.             c->flags = flags;

  1167.         }

  1168.         if (!(flags & SWS_ERROR_DIFFUSION) && (flags & SWS_FULL_CHR_H_INT)) {

  1169.             av_log(c, AV_LOG_DEBUG,

  1170.                 "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1171.                 av_get_pix_fmt_name(dstFormat));

  1172.             flags   |= SWS_ERROR_DIFFUSION;

  1173.             c->flags = flags;

  1174.         }

  1175.     }

  1176.     if (isPlanarRGB(dstFormat)) {

  1177.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1178.             av_log(c, AV_LOG_DEBUG,

  1179.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1180.                    av_get_pix_fmt_name(dstFormat));

  1181.             flags   |= SWS_FULL_CHR_H_INT;

  1182.             c->flags = flags;

  1183.         }

  1184.     }

  1185. 

  1186.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1187.      * chroma interpolation */

  1188.     if (flags & SWS_FULL_CHR_H_INT &&

  1189.         isAnyRGB(dstFormat)        &&

  1190.         !isPlanarRGB(dstFormat)    &&

  1191.         dstFormat != AV_PIX_FMT_RGBA  &&

  1192.         dstFormat != AV_PIX_FMT_ARGB  &&

  1193.         dstFormat != AV_PIX_FMT_BGRA  &&

  1194.         dstFormat != AV_PIX_FMT_ABGR  &&

  1195.         dstFormat != AV_PIX_FMT_RGB24 &&

  1196.         dstFormat != AV_PIX_FMT_BGR24 &&

  1197.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1198.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1199.         dstFormat != AV_PIX_FMT_BGR8 &&

  1200.         dstFormat != AV_PIX_FMT_RGB8

  1201.     ) {

  1202.         av_log(c, AV_LOG_WARNING,

  1203.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1204.                av_get_pix_fmt_name(dstFormat));

  1205.         flags   &= ~SWS_FULL_CHR_H_INT;

  1206.         c->flags = flags;

  1207.     }

  1208.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1209.         c->chrDstHSubSample = 1;

  1210. 

  1211.     // drop some chroma lines if the user wants it

  1212.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1213.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1214.     c->chrSrcVSubSample += c->vChrDrop;

  1215. 

  1216.     /* drop every other pixel for chroma calculation unless user

  1217.      * wants full chroma */

  1218.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1219.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1220.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1221.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1222.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1223.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1224.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1225.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1226.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1227.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1228.          (flags & SWS_FAST_BILINEAR)))

  1229.         c->chrSrcHSubSample = 1;

  1230. 

  1231.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1232.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1233.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1234.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1235.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1236. 

  1237.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1238. 

  1239.     /* unscaled special cases */

  1240.     if (unscaled && !usesHFilter && !usesVFilter &&

  1241.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1242.         ff_get_unscaled_swscale(c);

  1243. 

  1244.         if (c->swScale) {

  1245.             if (flags & SWS_PRINT_INFO)

  1246.                 av_log(c, AV_LOG_INFO,

  1247.                        "using unscaled %s -> %s special converter\n",

  1248.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1249.             return 0;

  1250.         }

  1251.     }

  1252. 

  1253.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1254.     if (c->srcBpc < 8)

  1255.         c->srcBpc = 8;

  1256.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1257.     if (c->dstBpc < 8)

  1258.         c->dstBpc = 8;

  1259.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1260.         c->srcBpc = 16;

  1261.     if (c->dstBpc == 16)

  1262.         dst_stride <<= 1;

  1263. 

  1264.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1265.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1266.                               (srcW & 15) == 0) ? 1 : 0;

  1267.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1268. 

  1269.             && (flags & SWS_FAST_BILINEAR)) {

  1270.             if (flags & SWS_PRINT_INFO)

  1271.                 av_log(c, AV_LOG_INFO,

  1272.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1273.         }

  1274.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1275.             c->canMMXEXTBeUsed = 0;

  1276.     } else

  1277.         c->canMMXEXTBeUsed = 0;

  1278. 

  1279.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1280.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1281. 

  1282.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1283.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1284.      * correct scaling.

  1285.      * n-2 is the last chrominance sample available.

  1286.      * This is not perfect, but no one should notice the difference, the more

  1287.      * correct variant would be like the vertical one, but that would require

  1288.      * some special code for the first and last pixel */

  1289.     if (flags & SWS_FAST_BILINEAR) {

  1290.         if (c->canMMXEXTBeUsed) {

  1291.             c->lumXInc += 20;

  1292.             c->chrXInc += 20;

  1293.         }

  1294.         // we don't use the x86 asm scaler if MMX is available

  1295.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1296.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1297.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1298.         }

  1299.     }

  1300. 

  1301. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1302. 

  1303.     /* precalculate horizontal scaler filter coefficients */

  1304.     {

  1305. #if HAVE_MMXEXT_INLINE

  1306. // can't downscale !!!

  1307.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1308.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1309.                                                              NULL, NULL, 8);

  1310.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1311.                                                              NULL, NULL, NULL, 4);

  1312. 

  1313. #if USE_MMAP

  1314.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1315.                                           PROT_READ | PROT_WRITE,

  1316.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1317.                                           -1, 0);

  1318.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1319.                                           PROT_READ | PROT_WRITE,

  1320.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1321.                                           -1, 0);

  1322. #elif HAVE_VIRTUALALLOC

  1323.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1324.                                                   c->lumMmxextFilterCodeSize,

  1325.                                                   MEM_COMMIT,

  1326.                                                   PAGE_EXECUTE_READWRITE);

  1327.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1328.                                                   c->chrMmxextFilterCodeSize,

  1329.                                                   MEM_COMMIT,

  1330.                                                   PAGE_EXECUTE_READWRITE);

  1331. #else

  1332.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1333.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1334. #endif

  1335. 

  1336. #ifdef MAP_ANONYMOUS

  1337.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1338. #else

  1339.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1340. #endif

  1341.             {

  1342.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1343.                 return AVERROR(ENOMEM);

  1344.             }

  1345. 

  1346.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1347.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1348.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1349.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1350. 

  1351.             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1352.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1353.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1354.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1355. 

  1356. #if USE_MMAP

  1357.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1358.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1359. #endif

  1360.         } else

  1361. #endif /* HAVE_MMXEXT_INLINE */

  1362.         {

  1363.             const int filterAlign =

  1364.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1365.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1366.                 1;

  1367. 

  1368.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1369.                            &c->hLumFilterSize, c->lumXInc,

  1370.                            srcW, dstW, filterAlign, 1 << 14,

  1371.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1372.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1373.                            c->param) < 0)

  1374.                 goto fail;

  1375.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1376.                            &c->hChrFilterSize, c->chrXInc,

  1377.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1378.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1379.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1380.                            c->param) < 0)

  1381.                 goto fail;

  1382.         }

  1383.     } // initialize horizontal stuff

  1384. 

  1385.     /* precalculate vertical scaler filter coefficients */

  1386.     {

  1387.         const int filterAlign =

  1388.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1389.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1390.             1;

  1391. 

  1392.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1393.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1394.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1395.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1396.                        c->param) < 0)

  1397.             goto fail;

  1398.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1399.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1400.                        filterAlign, (1 << 12),

  1401.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1402.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1403.                        c->param) < 0)

  1404.             goto fail;

  1405. 

  1406. #if HAVE_ALTIVEC

  1407.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1408.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1409. 

  1410.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1411.             int j;

  1412.             short *p = (short *)&c->vYCoeffsBank[i];

  1413.             for (j = 0; j < 8; j++)

  1414.                 p[j] = c->vLumFilter[i];

  1415.         }

  1416. 

  1417.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1418.             int j;

  1419.             short *p = (short *)&c->vCCoeffsBank[i];

  1420.             for (j = 0; j < 8; j++)

  1421.                 p[j] = c->vChrFilter[i];

  1422.         }

  1423. #endif

  1424.     }

  1425. 

  1426.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1427.     c->vLumBufSize = c->vLumFilterSize;

  1428.     c->vChrBufSize = c->vChrFilterSize;

  1429.     for (i = 0; i < dstH; i++) {

  1430.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1431.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1432.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1433.                                << c->chrSrcVSubSample));

  1434. 

  1435.         nextSlice >>= c->chrSrcVSubSample;

  1436.         nextSlice <<= c->chrSrcVSubSample;

  1437.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1438.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1439.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1440.             (nextSlice >> c->chrSrcVSubSample))

  1441.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1442.                              c->vChrFilterPos[chrI];

  1443.     }

  1444. 

  1445.     for (i = 0; i < 4; i++)

  1446.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1447. 

  1448.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1449.      * need to allocate several megabytes to handle all possible cases) */

  1450.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1451.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1452.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1453.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1454.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1455.     /* Note we need at least one pixel more at the end because of the MMX code

  1456.      * (just in case someone wants to replace the 4000/8000). */

  1457.     /* align at 16 bytes for AltiVec */

  1458.     for (i = 0; i < c->vLumBufSize; i++) {

  1459.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1460.                           dst_stride + 16, fail);

  1461.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1462.     }

  1463.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1464.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1465.     c->uv_offx2 = dst_stride + 16;

  1466.     for (i = 0; i < c->vChrBufSize; i++) {

  1467.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1468.                          dst_stride * 2 + 32, fail);

  1469.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1470.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1471.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1472.     }

  1473.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1474.         for (i = 0; i < c->vLumBufSize; i++) {

  1475.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1476.                               dst_stride + 16, fail);

  1477.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1478.         }

  1479. 

  1480.     // try to avoid drawing green stuff between the right end and the stride end

  1481.     for (i = 0; i < c->vChrBufSize; i++)

  1482.         if(desc_dst->comp[0].depth_minus1 == 15){

  1483.             av_assert0(c->dstBpc > 14);

  1484.             for(j=0; j<dst_stride/2+1; j++)

  1485.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1486.         } else

  1487.             for(j=0; j<dst_stride+1; j++)

  1488.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1489. 

  1490.     av_assert0(c->chrDstH <= dstH);

  1491. 

  1492.     if (flags & SWS_PRINT_INFO) {

  1493.         if (flags & SWS_FAST_BILINEAR)

  1494.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1495.         else if (flags & SWS_BILINEAR)

  1496.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1497.         else if (flags & SWS_BICUBIC)

  1498.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1499.         else if (flags & SWS_X)

  1500.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1501.         else if (flags & SWS_POINT)

  1502.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1503.         else if (flags & SWS_AREA)

  1504.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1505.         else if (flags & SWS_BICUBLIN)

  1506.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1507.         else if (flags & SWS_GAUSS)

  1508.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1509.         else if (flags & SWS_SINC)

  1510.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1511.         else if (flags & SWS_LANCZOS)

  1512.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1513.         else if (flags & SWS_SPLINE)

  1514.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1515.         else

  1516.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1517. 

  1518.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1519.                av_get_pix_fmt_name(srcFormat),

  1520. #ifdef DITHER1XBPP

  1521.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1522.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1523.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1524.                                                              "dithered " : "",

  1525. #else

  1526.                "",

  1527. #endif

  1528.                av_get_pix_fmt_name(dstFormat));

  1529. 

  1530.         if (INLINE_MMXEXT(cpu_flags))

  1531.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1532.         else if (INLINE_AMD3DNOW(cpu_flags))

  1533.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1534.         else if (INLINE_MMX(cpu_flags))

  1535.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1536.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1537.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1538.         else

  1539.             av_log(c, AV_LOG_INFO, "using C\n");

  1540. 

  1541.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1542.         av_log(c, AV_LOG_DEBUG,

  1543.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1544.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1545.         av_log(c, AV_LOG_DEBUG,

  1546.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1547.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1548.                c->chrXInc, c->chrYInc);

  1549.     }

  1550. 

  1551.     c->swScale = ff_getSwsFunc(c);

  1552.     return 0;

  1553. fail: // FIXME replace things by appropriate error codes

  1554.     return -1;

  1555. }

  1556. 

  1557. #if FF_API_SWS_GETCONTEXT

  1558. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1559.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1560.                            int flags, SwsFilter *srcFilter,

  1561.                            SwsFilter *dstFilter, const double *param)

  1562. {

  1563.     SwsContext *c;

  1564. 

  1565.     if (!(c = sws_alloc_context()))

  1566.         return NULL;

  1567. 

  1568.     c->flags     = flags;

  1569.     c->srcW      = srcW;

  1570.     c->srcH      = srcH;

  1571.     c->dstW      = dstW;

  1572.     c->dstH      = dstH;

  1573.     c->srcRange  = handle_jpeg(&srcFormat);

  1574.     c->dstRange  = handle_jpeg(&dstFormat);

  1575.     c->src0Alpha = handle_0alpha(&srcFormat);

  1576.     c->dst0Alpha = handle_0alpha(&dstFormat);

  1577.     c->srcXYZ    = handle_xyz(&srcFormat);

  1578.     c->dstXYZ    = handle_xyz(&dstFormat);

  1579.     c->srcFormat = srcFormat;

  1580.     c->dstFormat = dstFormat;

  1581. 

  1582.     if (param) {

  1583.         c->param[0] = param[0];

  1584.         c->param[1] = param[1];

  1585.     }

  1586.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1587.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1588.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1589. 

  1590.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1591.         sws_freeContext(c);

  1592.         return NULL;

  1593.     }

  1594. 

  1595.     return c;

  1596. }

  1597. #endif

  1598. 

  1599. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1600.                                 float lumaSharpen, float chromaSharpen,

  1601.                                 float chromaHShift, float chromaVShift,

  1602.                                 int verbose)

  1603. {

  1604.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1605.     if (!filter)

  1606.         return NULL;

  1607. 

  1608.     if (lumaGBlur != 0.0) {

  1609.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1610.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1611.     } else {

  1612.         filter->lumH = sws_getIdentityVec();

  1613.         filter->lumV = sws_getIdentityVec();

  1614.     }

  1615. 

  1616.     if (chromaGBlur != 0.0) {

  1617.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1618.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1619.     } else {

  1620.         filter->chrH = sws_getIdentityVec();

  1621.         filter->chrV = sws_getIdentityVec();

  1622.     }

  1623. 

  1624.     if (chromaSharpen != 0.0) {

  1625.         SwsVector *id = sws_getIdentityVec();

  1626.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1627.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1628.         sws_addVec(filter->chrH, id);

  1629.         sws_addVec(filter->chrV, id);

  1630.         sws_freeVec(id);

  1631.     }

  1632. 

  1633.     if (lumaSharpen != 0.0) {

  1634.         SwsVector *id = sws_getIdentityVec();

  1635.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1636.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1637.         sws_addVec(filter->lumH, id);

  1638.         sws_addVec(filter->lumV, id);

  1639.         sws_freeVec(id);

  1640.     }

  1641. 

  1642.     if (chromaHShift != 0.0)

  1643.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1644. 

  1645.     if (chromaVShift != 0.0)

  1646.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1647. 

  1648.     sws_normalizeVec(filter->chrH, 1.0);

  1649.     sws_normalizeVec(filter->chrV, 1.0);

  1650.     sws_normalizeVec(filter->lumH, 1.0);

  1651.     sws_normalizeVec(filter->lumV, 1.0);

  1652. 

  1653.     if (verbose)

  1654.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1655.     if (verbose)

  1656.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1657. 

  1658.     return filter;

  1659. }

  1660. 

  1661. SwsVector *sws_allocVec(int length)

  1662. {

  1663.     SwsVector *vec;

  1664. 

  1665.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1666.         return NULL;

  1667. 

  1668.     vec = av_malloc(sizeof(SwsVector));

  1669.     if (!vec)

  1670.         return NULL;

  1671.     vec->length = length;

  1672.     vec->coeff  = av_malloc(sizeof(double) * length);

  1673.     if (!vec->coeff)

  1674.         av_freep(&vec);

  1675.     return vec;

  1676. }

  1677. 

  1678. SwsVector *sws_getGaussianVec(double variance, double quality)

  1679. {

  1680.     const int length = (int)(variance * quality + 0.5) | 1;

  1681.     int i;

  1682.     double middle  = (length - 1) * 0.5;

  1683.     SwsVector *vec;

  1684. 

  1685.     if(variance < 0 || quality < 0)

  1686.         return NULL;

  1687. 

  1688.     vec = sws_allocVec(length);

  1689. 

  1690.     if (!vec)

  1691.         return NULL;

  1692. 

  1693.     for (i = 0; i < length; i++) {

  1694.         double dist = i - middle;

  1695.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1696.                         sqrt(2 * variance * M_PI);

  1697.     }

  1698. 

  1699.     sws_normalizeVec(vec, 1.0);

  1700. 

  1701.     return vec;

  1702. }

  1703. 

  1704. SwsVector *sws_getConstVec(double c, int length)

  1705. {

  1706.     int i;

  1707.     SwsVector *vec = sws_allocVec(length);

  1708. 

  1709.     if (!vec)

  1710.         return NULL;

  1711. 

  1712.     for (i = 0; i < length; i++)

  1713.         vec->coeff[i] = c;

  1714. 

  1715.     return vec;

  1716. }

  1717. 

  1718. SwsVector *sws_getIdentityVec(void)

  1719. {

  1720.     return sws_getConstVec(1.0, 1);

  1721. }

  1722. 

  1723. static double sws_dcVec(SwsVector *a)

  1724. {

  1725.     int i;

  1726.     double sum = 0;

  1727. 

  1728.     for (i = 0; i < a->length; i++)

  1729.         sum += a->coeff[i];

  1730. 

  1731.     return sum;

  1732. }

  1733. 

  1734. void sws_scaleVec(SwsVector *a, double scalar)

  1735. {

  1736.     int i;

  1737. 

  1738.     for (i = 0; i < a->length; i++)

  1739.         a->coeff[i] *= scalar;

  1740. }

  1741. 

  1742. void sws_normalizeVec(SwsVector *a, double height)

  1743. {

  1744.     sws_scaleVec(a, height / sws_dcVec(a));

  1745. }

  1746. 

  1747. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1748. {

  1749.     int length = a->length + b->length - 1;

  1750.     int i, j;

  1751.     SwsVector *vec = sws_getConstVec(0.0, length);

  1752. 

  1753.     if (!vec)

  1754.         return NULL;

  1755. 

  1756.     for (i = 0; i < a->length; i++) {

  1757.         for (j = 0; j < b->length; j++) {

  1758.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1759.         }

  1760.     }

  1761. 

  1762.     return vec;

  1763. }

  1764. 

  1765. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1766. {

  1767.     int length = FFMAX(a->length, b->length);

  1768.     int i;

  1769.     SwsVector *vec = sws_getConstVec(0.0, length);

  1770. 

  1771.     if (!vec)

  1772.         return NULL;

  1773. 

  1774.     for (i = 0; i < a->length; i++)

  1775.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1776.     for (i = 0; i < b->length; i++)

  1777.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1778. 

  1779.     return vec;

  1780. }

  1781. 

  1782. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1783. {

  1784.     int length = FFMAX(a->length, b->length);

  1785.     int i;

  1786.     SwsVector *vec = sws_getConstVec(0.0, length);

  1787. 

  1788.     if (!vec)

  1789.         return NULL;

  1790. 

  1791.     for (i = 0; i < a->length; i++)

  1792.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1793.     for (i = 0; i < b->length; i++)

  1794.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1795. 

  1796.     return vec;

  1797. }

  1798. 

  1799. /* shift left / or right if "shift" is negative */

  1800. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1801. {

  1802.     int length = a->length + FFABS(shift) * 2;

  1803.     int i;

  1804.     SwsVector *vec = sws_getConstVec(0.0, length);

  1805. 

  1806.     if (!vec)

  1807.         return NULL;

  1808. 

  1809.     for (i = 0; i < a->length; i++) {

  1810.         vec->coeff[i + (length    - 1) / 2 -

  1811.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1812.     }

  1813. 

  1814.     return vec;

  1815. }

  1816. 

  1817. void sws_shiftVec(SwsVector *a, int shift)

  1818. {

  1819.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1820.     av_free(a->coeff);

  1821.     a->coeff  = shifted->coeff;

  1822.     a->length = shifted->length;

  1823.     av_free(shifted);

  1824. }

  1825. 

  1826. void sws_addVec(SwsVector *a, SwsVector *b)

  1827. {

  1828.     SwsVector *sum = sws_sumVec(a, b);

  1829.     av_free(a->coeff);

  1830.     a->coeff  = sum->coeff;

  1831.     a->length = sum->length;

  1832.     av_free(sum);

  1833. }

  1834. 

  1835. void sws_subVec(SwsVector *a, SwsVector *b)

  1836. {

  1837.     SwsVector *diff = sws_diffVec(a, b);

  1838.     av_free(a->coeff);

  1839.     a->coeff  = diff->coeff;

  1840.     a->length = diff->length;

  1841.     av_free(diff);

  1842. }

  1843. 

  1844. void sws_convVec(SwsVector *a, SwsVector *b)

  1845. {

  1846.     SwsVector *conv = sws_getConvVec(a, b);

  1847.     av_free(a->coeff);

  1848.     a->coeff  = conv->coeff;

  1849.     a->length = conv->length;

  1850.     av_free(conv);

  1851. }

  1852. 

  1853. SwsVector *sws_cloneVec(SwsVector *a)

  1854. {

  1855.     int i;

  1856.     SwsVector *vec = sws_allocVec(a->length);

  1857. 

  1858.     if (!vec)

  1859.         return NULL;

  1860. 

  1861.     for (i = 0; i < a->length; i++)

  1862.         vec->coeff[i] = a->coeff[i];

  1863. 

  1864.     return vec;

  1865. }

  1866. 

  1867. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1868. {

  1869.     int i;

  1870.     double max = 0;

  1871.     double min = 0;

  1872.     double range;

  1873. 

  1874.     for (i = 0; i < a->length; i++)

  1875.         if (a->coeff[i] > max)

  1876.             max = a->coeff[i];

  1877. 

  1878.     for (i = 0; i < a->length; i++)

  1879.         if (a->coeff[i] < min)

  1880.             min = a->coeff[i];

  1881. 

  1882.     range = max - min;

  1883. 

  1884.     for (i = 0; i < a->length; i++) {

  1885.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1886.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1887.         for (; x > 0; x--)

  1888.             av_log(log_ctx, log_level, " ");

  1889.         av_log(log_ctx, log_level, "|\n");

  1890.     }

  1891. }

  1892. 

  1893. void sws_freeVec(SwsVector *a)

  1894. {

  1895.     if (!a)

  1896.         return;

  1897.     av_freep(&a->coeff);

  1898.     a->length = 0;

  1899.     av_free(a);

  1900. }

  1901. 

  1902. void sws_freeFilter(SwsFilter *filter)

  1903. {

  1904.     if (!filter)

  1905.         return;

  1906. 

  1907.     if (filter->lumH)

  1908.         sws_freeVec(filter->lumH);

  1909.     if (filter->lumV)

  1910.         sws_freeVec(filter->lumV);

  1911.     if (filter->chrH)

  1912.         sws_freeVec(filter->chrH);

  1913.     if (filter->chrV)

  1914.         sws_freeVec(filter->chrV);

  1915.     av_free(filter);

  1916. }

  1917. 

  1918. void sws_freeContext(SwsContext *c)

  1919. {

  1920.     int i;

  1921.     if (!c)

  1922.         return;

  1923. 

  1924.     if (c->lumPixBuf) {

  1925.         for (i = 0; i < c->vLumBufSize; i++)

  1926.             av_freep(&c->lumPixBuf[i]);

  1927.         av_freep(&c->lumPixBuf);

  1928.     }

  1929. 

  1930.     if (c->chrUPixBuf) {

  1931.         for (i = 0; i < c->vChrBufSize; i++)

  1932.             av_freep(&c->chrUPixBuf[i]);

  1933.         av_freep(&c->chrUPixBuf);

  1934.         av_freep(&c->chrVPixBuf);

  1935.     }

  1936. 

  1937.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1938.         for (i = 0; i < c->vLumBufSize; i++)

  1939.             av_freep(&c->alpPixBuf[i]);

  1940.         av_freep(&c->alpPixBuf);

  1941.     }

  1942. 

  1943.     for (i = 0; i < 4; i++)

  1944.         av_freep(&c->dither_error[i]);

  1945. 

  1946.     av_freep(&c->vLumFilter);

  1947.     av_freep(&c->vChrFilter);

  1948.     av_freep(&c->hLumFilter);

  1949.     av_freep(&c->hChrFilter);

  1950. #if HAVE_ALTIVEC

  1951.     av_freep(&c->vYCoeffsBank);

  1952.     av_freep(&c->vCCoeffsBank);

  1953. #endif

  1954. 

  1955.     av_freep(&c->vLumFilterPos);

  1956.     av_freep(&c->vChrFilterPos);

  1957.     av_freep(&c->hLumFilterPos);

  1958.     av_freep(&c->hChrFilterPos);

  1959. 

  1960. #if HAVE_MMX_INLINE

  1961. #if USE_MMAP

  1962.     if (c->lumMmxextFilterCode)

  1963.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1964.     if (c->chrMmxextFilterCode)

  1965.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1966. #elif HAVE_VIRTUALALLOC

  1967.     if (c->lumMmxextFilterCode)

  1968.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1969.     if (c->chrMmxextFilterCode)

  1970.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1971. #else

  1972.     av_free(c->lumMmxextFilterCode);

  1973.     av_free(c->chrMmxextFilterCode);

  1974. #endif

  1975.     c->lumMmxextFilterCode = NULL;

  1976.     c->chrMmxextFilterCode = NULL;

  1977. #endif /* HAVE_MMX_INLINE */

  1978. 

  1979.     av_freep(&c->yuvTable);

  1980.     av_freep(&c->formatConvBuffer);

  1981. 

  1982.     av_free(c);

  1983. }

  1984. 

  1985. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1986.                                         int srcH, enum AVPixelFormat srcFormat,

  1987.                                         int dstW, int dstH,

  1988.                                         enum AVPixelFormat dstFormat, int flags,

  1989.                                         SwsFilter *srcFilter,

  1990.                                         SwsFilter *dstFilter,

  1991.                                         const double *param)

  1992. {

  1993.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1994.                                              SWS_PARAM_DEFAULT };

  1995. 

  1996.     if (!param)

  1997.         param = default_param;

  1998. 

  1999.     if (context &&

  2000.         (context->srcW      != srcW      ||

  2001.          context->srcH      != srcH      ||

  2002.          context->srcFormat != srcFormat ||

  2003.          context->dstW      != dstW      ||

  2004.          context->dstH      != dstH      ||

  2005.          context->dstFormat != dstFormat ||

  2006.          context->flags     != flags     ||

  2007.          context->param[0]  != param[0]  ||

  2008.          context->param[1]  != param[1])) {

  2009.         sws_freeContext(context);

  2010.         context = NULL;

  2011.     }

  2012. 

  2013.     if (!context) {

  2014.         if (!(context = sws_alloc_context()))

  2015.             return NULL;

  2016.         context->srcW      = srcW;

  2017.         context->srcH      = srcH;

  2018.         context->srcRange  = handle_jpeg(&srcFormat);

  2019.         context->src0Alpha = handle_0alpha(&srcFormat);

  2020.         context->srcXYZ    = handle_xyz(&srcFormat);

  2021.         context->srcFormat = srcFormat;

  2022.         context->dstW      = dstW;

  2023.         context->dstH      = dstH;

  2024.         context->dstRange  = handle_jpeg(&dstFormat);

  2025.         context->dst0Alpha = handle_0alpha(&dstFormat);

  2026.         context->dstXYZ    = handle_xyz(&dstFormat);

  2027.         context->dstFormat = dstFormat;

  2028.         context->flags     = flags;

  2029.         context->param[0]  = param[0];

  2030.         context->param[1]  = param[1];

  2031.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  2032.                                  context->srcRange,

  2033.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  2034.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  2035.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2036.             sws_freeContext(context);

  2037.             return NULL;

  2038.         }

  2039.     }

  2040.     return context;

  2041. }