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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_YUVJ411P]    = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  207. };

  208. 

  209. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  210. {

  211.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  212.            format_entries[pix_fmt].is_supported_in : 0;

  213. }

  214. 

  215. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  216. {

  217.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  218.            format_entries[pix_fmt].is_supported_out : 0;

  219. }

  220. 

  221. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  222. {

  223.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  224.            format_entries[pix_fmt].is_supported_endianness : 0;

  225. }

  226. 

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

  228. 

  229. #if FF_API_SWS_FORMAT_NAME

  230. const char *sws_format_name(enum AVPixelFormat format)

  231. {

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

  233.     if (desc)

  234.         return desc->name;

  235.     else

  236.         return "Unknown format";

  237. }

  238. #endif

  239. 

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

  241.                              double dist)

  242. {

  243.     if (dist <= 1.0)

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

  245.     else

  246.         return getSplineCoeff(0.0,

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

  248.                                c + 3.0 * d,

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

  250.                               dist - 1.0);

  251. }

  252. 

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

  254.                               int *outFilterSize, int xInc, int srcW,

  255.                               int dstW, int filterAlign, int one,

  256.                               int flags, int cpu_flags,

  257.                               SwsVector *srcFilter, SwsVector *dstFilter,

  258.                               double param[2])

  259. {

  260.     int i;

  261.     int filterSize;

  262.     int filter2Size;

  263.     int minFilterSize;

  264.     int64_t *filter    = NULL;

  265.     int64_t *filter2   = NULL;

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

  267.     int ret            = -1;

  268. 

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

  270. 

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

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

  273. 

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

  275.         int i;

  276.         filterSize = 1;

  277.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  279. 

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

  281.             filter[i * filterSize] = fone;

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

  283.         }

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

  285.         int i;

  286.         int64_t xDstInSrc;

  287.         filterSize = 1;

  288.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  290. 

  291.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  294. 

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

  296.             filter[i]       = fone;

  297.             xDstInSrc      += xInc;

  298.         }

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

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

  301.         int i;

  302.         int64_t xDstInSrc;

  303.         filterSize = 2;

  304.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  306. 

  307.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  310.             int j;

  311. 

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

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

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

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

  316.                 if (coeff < 0)

  317.                     coeff = 0;

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

  319.                 xx++;

  320.             }

  321.             xDstInSrc += xInc;

  322.         }

  323.     } else {

  324.         int64_t xDstInSrc;

  325.         int sizeFactor;

  326. 

  327.         if (flags & SWS_BICUBIC)

  328.             sizeFactor = 4;

  329.         else if (flags & SWS_X)

  330.             sizeFactor = 8;

  331.         else if (flags & SWS_AREA)

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

  333.         else if (flags & SWS_GAUSS)

  334.             sizeFactor = 8;     // infinite ;)

  335.         else if (flags & SWS_LANCZOS)

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

  337.         else if (flags & SWS_SINC)

  338.             sizeFactor = 20;    // infinite ;)

  339.         else if (flags & SWS_SPLINE)

  340.             sizeFactor = 20;    // infinite ;)

  341.         else if (flags & SWS_BILINEAR)

  342.             sizeFactor = 2;

  343.         else {

  344.             av_assert0(0);

  345.         }

  346. 

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

  348.             filterSize = 1 + sizeFactor;    // upscale

  349.         else

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

  351. 

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

  353.         filterSize = FFMAX(filterSize, 1);

  354. 

  355.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  357. 

  358.         xDstInSrc = xInc - 0x10000;

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

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

  361.             int j;

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

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

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

  365.                 double floatd;

  366.                 int64_t coeff;

  367. 

  368.                 if (xInc > 1 << 16)

  369.                     d = d * dstW / srcW;

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

  371. 

  372.                 if (flags & SWS_BICUBIC) {

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

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

  375. 

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

  377.                         coeff = 0.0;

  378.                     } else {

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

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

  381. 

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

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

  384.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  385.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  386.                         else

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

  388.                                       (6 * B + 30 * C) * dd  +

  389.                                     (-12 * B - 48 * C) * d   +

  390.                                       (8 * B + 24 * C) * (1 << 30);

  391.                     }

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

  393.                 }

  394. #if 0

  395.                 else if (flags & SWS_X) {

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

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

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

  399.                 }

  400. #endif

  401.                 else if (flags & SWS_X) {

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

  403.                     double c;

  404. 

  405.                     if (floatd < 1.0)

  406.                         c = cos(floatd * M_PI);

  407.                     else

  408.                         c = -1.0;

  409.                     if (c < 0.0)

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

  411.                     else

  412.                         c = pow(c, A);

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

  414.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  420.                     else

  421.                         coeff = 0.0;

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

  423.                 } else if (flags & SWS_GAUSS) {

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

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

  426.                 } else if (flags & SWS_SINC) {

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

  428.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  432.                     if (floatd > p)

  433.                         coeff = 0;

  434.                 } else if (flags & SWS_BILINEAR) {

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

  436.                     if (coeff < 0)

  437.                         coeff = 0;

  438.                     coeff *= fone >> 30;

  439.                 } else if (flags & SWS_SPLINE) {

  440.                     double p = -2.196152422706632;

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

  442.                 } else {

  443.                     av_assert0(0);

  444.                 }

  445. 

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

  447.                 xx++;

  448.             }

  449.             xDstInSrc += 2 * xInc;

  450.         }

  451.     }

  452. 

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

  454.      * av_free(filter);

  455.      */

  456.     av_assert0(filterSize > 0);

  457.     filter2Size = filterSize;

  458.     if (srcFilter)

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

  460.     if (dstFilter)

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

  462.     av_assert0(filter2Size > 0);

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

  464. 

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

  466.         int j, k;

  467. 

  468.         if (srcFilter) {

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

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

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

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

  473.             }

  474.         } else {

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

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

  477.         }

  478.         // FIXME dstFilter

  479. 

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

  481.     }

  482.     av_freep(&filter);

  483. 

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

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

  486.     minFilterSize = 0;

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

  488.         int min = filter2Size;

  489.         int j;

  490.         int64_t cutOff = 0.0;

  491. 

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

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

  494.             int k;

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

  496. 

  497.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  498.                 break;

  499. 

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

  501.              * filter otherwise */

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

  503.                 break;

  504. 

  505.             // move filter coefficients left

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

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

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

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

  510.         }

  511. 

  512.         cutOff = 0;

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

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

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

  516. 

  517.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  518.                 break;

  519.             min--;

  520.         }

  521. 

  522.         if (min > minFilterSize)

  523.             minFilterSize = min;

  524.     }

  525. 

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

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

  528.         if (minFilterSize < 5)

  529.             filterAlign = 4;

  530. 

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

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

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

  534.         if (minFilterSize < 3)

  535.             filterAlign = 1;

  536.     }

  537. 

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

  539.         // special case for unscaled vertical filtering

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

  541.             filterAlign = 1;

  542.     }

  543. 

  544.     av_assert0(minFilterSize > 0);

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

  546.     av_assert0(filterSize > 0);

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

  548.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  550.         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);

  551.         goto fail;

  552.     }

  553.     *outFilterSize = filterSize;

  554. 

  555.     if (flags & SWS_PRINT_INFO)

  556.         av_log(NULL, AV_LOG_VERBOSE,

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

  558.                filter2Size, filterSize);

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

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

  561.         int j;

  562. 

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

  564.             if (j >= filter2Size)

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

  566.             else

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

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

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

  570.         }

  571.     }

  572. 

  573.     // FIXME try to align filterPos if possible

  574. 

  575.     // fix borders

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

  577.         int j;

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

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

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

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

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

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

  584.             }

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

  586.         }

  587. 

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

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

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

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

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

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

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

  595.             }

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

  597.         }

  598.     }

  599. 

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

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

  602.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  604. 

  605.     /* normalize & store in outFilter */

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

  607.         int j;

  608.         int64_t error = 0;

  609.         int64_t sum   = 0;

  610. 

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

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

  613.         }

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

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

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

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

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

  619.             error                                  = v - intV * sum;

  620.         }

  621.     }

  622. 

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

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

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

  626.                                                       * read over the end */

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

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

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

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

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

  632.     }

  633. 

  634.     ret = 0;

  635. 

  636. fail:

  637.     if(ret < 0)

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

  639.     av_free(filter);

  640.     av_free(filter2);

  641.     return ret;

  642. }

  643. 

  644. #if HAVE_MMXEXT_INLINE

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

  646.                                        int16_t *filter, int32_t *filterPos,

  647.                                        int numSplits)

  648. {

  649.     uint8_t *fragmentA;

  650.     x86_reg imm8OfPShufW1A;

  651.     x86_reg imm8OfPShufW2A;

  652.     x86_reg fragmentLengthA;

  653.     uint8_t *fragmentB;

  654.     x86_reg imm8OfPShufW1B;

  655.     x86_reg imm8OfPShufW2B;

  656.     x86_reg fragmentLengthB;

  657.     int fragmentPos;

  658. 

  659.     int xpos, i;

  660. 

  661.     // create an optimized horizontal scaling routine

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

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

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

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

  666.      */

  667. 

  668.     // code fragment

  669. 

  670.     __asm__ volatile (

  671.         "jmp                         9f                 \n\t"

  672.         // Begin

  673.         "0:                                             \n\t"

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

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

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

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

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

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

  680.         "1:                                             \n\t"

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

  682.         "2:                                             \n\t"

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

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

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

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

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

  688. 

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

  690. 

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

  692.         // End

  693.         "9:                                             \n\t"

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

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

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

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

  698.         "dec                         %1                 \n\t"

  699.         "dec                         %2                 \n\t"

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

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

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

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

  704. 

  705. 

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

  707.           "=r" (fragmentLengthA)

  708.         );

  709. 

  710.     __asm__ volatile (

  711.         "jmp                         9f                 \n\t"

  712.         // Begin

  713.         "0:                                             \n\t"

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

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

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

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

  718.         "1:                                             \n\t"

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

  720.         "2:                                             \n\t"

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

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

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

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

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

  726. 

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

  728. 

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

  730.         // End

  731.         "9:                                             \n\t"

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

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

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

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

  736.         "dec                         %1                 \n\t"

  737.         "dec                         %2                 \n\t"

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

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

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

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

  742. 

  743. 

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

  745.           "=r" (fragmentLengthB)

  746.         );

  747. 

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

  749.     fragmentPos = 0;

  750. 

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

  752.         int xx = xpos >> 16;

  753. 

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

  755.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  765.             int shift              = 0;

  766. 

  767.             if (filterCode) {

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

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

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

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

  772.                 filterPos[i / 2] = xx;

  773. 

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

  775. 

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

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

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

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

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

  781.                                                                (c << 4) |

  782.                                                                (d << 6);

  783. 

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

  785.                     shift = maxShift;               // avoid overread

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

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

  788. 

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

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

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

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

  793.                 }

  794.             }

  795. 

  796.             fragmentPos += fragmentLength;

  797. 

  798.             if (filterCode)

  799.                 filterCode[fragmentPos] = RET;

  800.         }

  801.         xpos += xInc;

  802.     }

  803.     if (filterCode)

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

  805. 

  806.     return fragmentPos + 1;

  807. }

  808. #endif /* HAVE_MMXEXT_INLINE */

  809. 

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

  811. {

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

  813.     *h = desc->log2_chroma_w;

  814.     *v = desc->log2_chroma_h;

  815. }

  816. 

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

  818. {

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

  820.     int64_t vr =  table[0];

  821.     int64_t ub =  table[1];

  822.     int64_t ug = -table[2];

  823.     int64_t vg = -table[3];

  824.     int64_t ONE = 65536;

  825.     int64_t cy = ONE;

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

  827.     int i;

  828.     static const int8_t map[] = {

  829.     BY_IDX, GY_IDX, -1    , BY_IDX, BY_IDX, GY_IDX, -1    , BY_IDX,

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

  831.     RY_IDX, GY_IDX, -1    , RY_IDX, RY_IDX, GY_IDX, -1    , RY_IDX,

  832.     BY_IDX, -1    , GY_IDX, BY_IDX, BY_IDX, -1    , GY_IDX, BY_IDX,

  833.     BU_IDX, GU_IDX, -1    , BU_IDX, BU_IDX, GU_IDX, -1    , BU_IDX,

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

  835.     RU_IDX, GU_IDX, -1    , RU_IDX, RU_IDX, GU_IDX, -1    , RU_IDX,

  836.     BU_IDX, -1    , GU_IDX, BU_IDX, BU_IDX, -1    , GU_IDX, BU_IDX,

  837.     BV_IDX, GV_IDX, -1    , BV_IDX, BV_IDX, GV_IDX, -1    , BV_IDX,

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

  839.     RV_IDX, GV_IDX, -1    , RV_IDX, RV_IDX, GV_IDX, -1    , RV_IDX,

  840.     BV_IDX, -1    , GV_IDX, BV_IDX, BV_IDX, -1    , GV_IDX, BV_IDX,

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

  842.     BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX, BY_IDX, RY_IDX,

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

  844.     -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX, -1    , GY_IDX,

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

  846.     BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX, BU_IDX, RU_IDX,

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

  848.     -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX, -1    , GU_IDX,

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

  850.     BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX, BV_IDX, RV_IDX,

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

  852.     -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, -1    , GV_IDX, //23

  853.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //24

  854.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //25

  855.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //26

  856.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //27

  857.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //28

  858.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //29

  859.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //30

  860.     -1    , -1    , -1    , -1    , -1    , -1    , -1    , -1    , //31

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

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

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

  864.     };

  865. 

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

  867. 

  868.     if (!dstRange) {

  869.         cy = cy * 255 / 219;

  870.     } else {

  871.         vr = vr * 224 / 255;

  872.         ub = ub * 224 / 255;

  873.         ug = ug * 224 / 255;

  874.         vg = vg * 224 / 255;

  875.     }

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

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

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

  879. 

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

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

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

  883. 

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

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

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

  887. 

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

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

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

  891. 

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

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

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

  895. 

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

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

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

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

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

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

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

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

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

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

  906.     }

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

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

  909. }

  910. 

  911. static void fill_xyztables(struct SwsContext *c)

  912. {

  913.     int i;

  914.     double xyzgamma = XYZ_GAMMA;

  915.     double rgbgamma = 1.0 / RGB_GAMMA;

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

  917.         {13270, -6295, -2041},

  918.         {-3969,  7682,   170},

  919.         {  228,  -835,  4329} };

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

  921. 

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

  923.     c->xyzgamma = xyzgamma_tab;

  924.     c->rgbgamma = rgbgamma_tab;

  925. 

  926.     if (rgbgamma_tab[4095])

  927.         return;

  928. 

  929.     /* set gamma vectors */

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

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

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

  933.     }

  934. }

  935. 

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

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

  938.                              int brightness, int contrast, int saturation)

  939. {

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

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

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

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

  944. 

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

  946.         dstRange = 0;

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

  948.         srcRange = 0;

  949. 

  950.     c->brightness = brightness;

  951.     c->contrast   = contrast;

  952.     c->saturation = saturation;

  953.     c->srcRange   = srcRange;

  954.     c->dstRange   = dstRange;

  955. 

  956.     fill_xyztables(c);

  957. 

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

  959.         return -1;

  960. 

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

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

  963. 

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

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

  966.                              contrast, saturation);

  967.     // FIXME factorize

  968. 

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

  970.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  971.                                        contrast, saturation);

  972.     }

  973. 

  974.     fill_rgb2yuv_table(c, table, dstRange);

  975. 

  976.     return 0;

  977. }

  978. 

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

  980.                              int *srcRange, int **table, int *dstRange,

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

  982. {

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

  984.         return -1;

  985. 

  986.     *inv_table  = c->srcColorspaceTable;

  987.     *table      = c->dstColorspaceTable;

  988.     *srcRange   = c->srcRange;

  989.     *dstRange   = c->dstRange;

  990.     *brightness = c->brightness;

  991.     *contrast   = c->contrast;

  992.     *saturation = c->saturation;

  993. 

  994.     return 0;

  995. }

  996. 

  997. static int handle_jpeg(enum AVPixelFormat *format)

  998. {

  999.     switch (*format) {

  1000.     case AV_PIX_FMT_YUVJ420P:

  1001.         *format = AV_PIX_FMT_YUV420P;

  1002.         return 1;

  1003.     case AV_PIX_FMT_YUVJ411P:

  1004.         *format = AV_PIX_FMT_YUV411P;

  1005.         return 1;

  1006.     case AV_PIX_FMT_YUVJ422P:

  1007.         *format = AV_PIX_FMT_YUV422P;

  1008.         return 1;

  1009.     case AV_PIX_FMT_YUVJ444P:

  1010.         *format = AV_PIX_FMT_YUV444P;

  1011.         return 1;

  1012.     case AV_PIX_FMT_YUVJ440P:

  1013.         *format = AV_PIX_FMT_YUV440P;

  1014.         return 1;

  1015.     default:

  1016.         return 0;

  1017.     }

  1018. }

  1019. 

  1020. static int handle_0alpha(enum AVPixelFormat *format)

  1021. {

  1022.     switch (*format) {

  1023.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  1024.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  1025.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  1026.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  1027.     default:                                          return 0;

  1028.     }

  1029. }

  1030. 

  1031. static int handle_xyz(enum AVPixelFormat *format)

  1032. {

  1033.     switch (*format) {

  1034.     case AV_PIX_FMT_XYZ12BE : *format = AV_PIX_FMT_RGB48BE; return 1;

  1035.     case AV_PIX_FMT_XYZ12LE : *format = AV_PIX_FMT_RGB48LE; return 1;

  1036.     default:                                                return 0;

  1037.     }

  1038. }

  1039. 

  1040. SwsContext *sws_alloc_context(void)

  1041. {

  1042.     SwsContext *c = av_mallocz(sizeof(SwsContext));

  1043. 

  1044.     if (c) {

  1045.         c->av_class = &sws_context_class;

  1046.         av_opt_set_defaults(c);

  1047.     }

  1048. 

  1049.     return c;

  1050. }

  1051. 

  1052. av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,

  1053.                              SwsFilter *dstFilter)

  1054. {

  1055.     int i, j;

  1056.     int usesVFilter, usesHFilter;

  1057.     int unscaled;

  1058.     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };

  1059.     int srcW              = c->srcW;

  1060.     int srcH              = c->srcH;

  1061.     int dstW              = c->dstW;

  1062.     int dstH              = c->dstH;

  1063.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  1064.     int flags, cpu_flags;

  1065.     enum AVPixelFormat srcFormat = c->srcFormat;

  1066.     enum AVPixelFormat dstFormat = c->dstFormat;

  1067.     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);

  1068.     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);

  1069. 

  1070.     cpu_flags = av_get_cpu_flags();

  1071.     flags     = c->flags;

  1072.     emms_c();

  1073.     if (!rgb15to16)

  1074.         sws_rgb2rgb_init();

  1075. 

  1076.     unscaled = (srcW == dstW && srcH == dstH);

  1077. 

  1078.     handle_jpeg(&srcFormat);

  1079.     handle_jpeg(&dstFormat);

  1080.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat)

  1081.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  1082.     handle_0alpha(&srcFormat);

  1083.     handle_0alpha(&dstFormat);

  1084.     handle_xyz(&srcFormat);

  1085.     handle_xyz(&dstFormat);

  1086. 

  1087.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){

  1088.         c->srcFormat= srcFormat;

  1089.         c->dstFormat= dstFormat;

  1090.     }

  1091. 

  1092.     if (!(unscaled && sws_isSupportedEndiannessConversion(srcFormat) &&

  1093.           av_pix_fmt_swap_endianness(srcFormat) == dstFormat)) {

  1094.     if (!sws_isSupportedInput(srcFormat)) {

  1095.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n",

  1096.                av_get_pix_fmt_name(srcFormat));

  1097.         return AVERROR(EINVAL);

  1098.     }

  1099.     if (!sws_isSupportedOutput(dstFormat)) {

  1100.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n",

  1101.                av_get_pix_fmt_name(dstFormat));

  1102.         return AVERROR(EINVAL);

  1103.     }

  1104.     }

  1105. 

  1106.     i = flags & (SWS_POINT         |

  1107.                  SWS_AREA          |

  1108.                  SWS_BILINEAR      |

  1109.                  SWS_FAST_BILINEAR |

  1110.                  SWS_BICUBIC       |

  1111.                  SWS_X             |

  1112.                  SWS_GAUSS         |

  1113.                  SWS_LANCZOS       |

  1114.                  SWS_SINC          |

  1115.                  SWS_SPLINE        |

  1116.                  SWS_BICUBLIN);

  1117.     if (!i || (i & (i - 1))) {

  1118.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);

  1119.         return AVERROR(EINVAL);

  1120.     }

  1121.     /* sanity check */

  1122.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

  1123.         /* FIXME check if these are enough and try to lower them after

  1124.          * fixing the relevant parts of the code */

  1125.         av_log(c, AV_LOG_ERROR, "%dx%d -> %dx%d is invalid scaling dimension\n",

  1126.                srcW, srcH, dstW, dstH);

  1127.         return AVERROR(EINVAL);

  1128.     }

  1129. 

  1130.     if (!dstFilter)

  1131.         dstFilter = &dummyFilter;

  1132.     if (!srcFilter)

  1133.         srcFilter = &dummyFilter;

  1134. 

  1135.     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;

  1136.     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

  1137.     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);

  1138.     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

  1139.     c->vRounder     = 4 * 0x0001000100010001ULL;

  1140. 

  1141.     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||

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

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

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

  1145.     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||

  1146.                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||

  1147.                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||

  1148.                   (dstFilter->chrH && dstFilter->chrH->length > 1);

  1149. 

  1150.     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);

  1151.     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);

  1152. 

  1153.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  1154.         if (dstW&1) {

  1155.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  1156.             flags |= SWS_FULL_CHR_H_INT;

  1157.             c->flags = flags;

  1158.         }

  1159.     }

  1160. 

  1161.     if(dstFormat == AV_PIX_FMT_BGR4_BYTE ||

  1162.        dstFormat == AV_PIX_FMT_RGB4_BYTE ||

  1163.        dstFormat == AV_PIX_FMT_BGR8 ||

  1164.        dstFormat == AV_PIX_FMT_RGB8) {

  1165.         if (flags & SWS_ERROR_DIFFUSION && !(flags & SWS_FULL_CHR_H_INT)) {

  1166.             av_log(c, AV_LOG_DEBUG,

  1167.                 "Error diffusion dither is only supported in full chroma interpolation for destination format '%s'\n",

  1168.                 av_get_pix_fmt_name(dstFormat));

  1169.             flags   |= SWS_FULL_CHR_H_INT;

  1170.             c->flags = flags;

  1171.         }

  1172.         if (!(flags & SWS_ERROR_DIFFUSION) && (flags & SWS_FULL_CHR_H_INT)) {

  1173.             av_log(c, AV_LOG_DEBUG,

  1174.                 "Ordered dither is not supported in full chroma interpolation for destination format '%s'\n",

  1175.                 av_get_pix_fmt_name(dstFormat));

  1176.             flags   |= SWS_ERROR_DIFFUSION;

  1177.             c->flags = flags;

  1178.         }

  1179.     }

  1180.     if (isPlanarRGB(dstFormat)) {

  1181.         if (!(flags & SWS_FULL_CHR_H_INT)) {

  1182.             av_log(c, AV_LOG_DEBUG,

  1183.                    "%s output is not supported with half chroma resolution, switching to full\n",

  1184.                    av_get_pix_fmt_name(dstFormat));

  1185.             flags   |= SWS_FULL_CHR_H_INT;

  1186.             c->flags = flags;

  1187.         }

  1188.     }

  1189. 

  1190.     /* reuse chroma for 2 pixels RGB/BGR unless user wants full

  1191.      * chroma interpolation */

  1192.     if (flags & SWS_FULL_CHR_H_INT &&

  1193.         isAnyRGB(dstFormat)        &&

  1194.         !isPlanarRGB(dstFormat)    &&

  1195.         dstFormat != AV_PIX_FMT_RGBA  &&

  1196.         dstFormat != AV_PIX_FMT_ARGB  &&

  1197.         dstFormat != AV_PIX_FMT_BGRA  &&

  1198.         dstFormat != AV_PIX_FMT_ABGR  &&

  1199.         dstFormat != AV_PIX_FMT_RGB24 &&

  1200.         dstFormat != AV_PIX_FMT_BGR24 &&

  1201.         dstFormat != AV_PIX_FMT_BGR4_BYTE &&

  1202.         dstFormat != AV_PIX_FMT_RGB4_BYTE &&

  1203.         dstFormat != AV_PIX_FMT_BGR8 &&

  1204.         dstFormat != AV_PIX_FMT_RGB8

  1205.     ) {

  1206.         av_log(c, AV_LOG_WARNING,

  1207.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1208.                av_get_pix_fmt_name(dstFormat));

  1209.         flags   &= ~SWS_FULL_CHR_H_INT;

  1210.         c->flags = flags;

  1211.     }

  1212.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1213.         c->chrDstHSubSample = 1;

  1214. 

  1215.     // drop some chroma lines if the user wants it

  1216.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1217.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1218.     c->chrSrcVSubSample += c->vChrDrop;

  1219. 

  1220.     /* drop every other pixel for chroma calculation unless user

  1221.      * wants full chroma */

  1222.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1223.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1224.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1225.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1226.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1227.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1228.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1229.         srcFormat != AV_PIX_FMT_GBRP14BE  && srcFormat != AV_PIX_FMT_GBRP14LE &&

  1230.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1231.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1232.          (flags & SWS_FAST_BILINEAR)))

  1233.         c->chrSrcHSubSample = 1;

  1234. 

  1235.     // Note the FF_CEIL_RSHIFT is so that we always round toward +inf.

  1236.     c->chrSrcW = FF_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1237.     c->chrSrcH = FF_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1238.     c->chrDstW = FF_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1239.     c->chrDstH = FF_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1240. 

  1241.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1242. 

  1243.     /* unscaled special cases */

  1244.     if (unscaled && !usesHFilter && !usesVFilter &&

  1245.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1246.         ff_get_unscaled_swscale(c);

  1247. 

  1248.         if (c->swScale) {

  1249.             if (flags & SWS_PRINT_INFO)

  1250.                 av_log(c, AV_LOG_INFO,

  1251.                        "using unscaled %s -> %s special converter\n",

  1252.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1253.             return 0;

  1254.         }

  1255.     }

  1256. 

  1257.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1258.     if (c->srcBpc < 8)

  1259.         c->srcBpc = 8;

  1260.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1261.     if (c->dstBpc < 8)

  1262.         c->dstBpc = 8;

  1263.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1264.         c->srcBpc = 16;

  1265.     if (c->dstBpc == 16)

  1266.         dst_stride <<= 1;

  1267. 

  1268.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1269.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1270.                               (srcW & 15) == 0) ? 1 : 0;

  1271.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1272. 

  1273.             && (flags & SWS_FAST_BILINEAR)) {

  1274.             if (flags & SWS_PRINT_INFO)

  1275.                 av_log(c, AV_LOG_INFO,

  1276.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1277.         }

  1278.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1279.             c->canMMXEXTBeUsed = 0;

  1280.     } else

  1281.         c->canMMXEXTBeUsed = 0;

  1282. 

  1283.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1284.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1285. 

  1286.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1287.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1288.      * correct scaling.

  1289.      * n-2 is the last chrominance sample available.

  1290.      * This is not perfect, but no one should notice the difference, the more

  1291.      * correct variant would be like the vertical one, but that would require

  1292.      * some special code for the first and last pixel */

  1293.     if (flags & SWS_FAST_BILINEAR) {

  1294.         if (c->canMMXEXTBeUsed) {

  1295.             c->lumXInc += 20;

  1296.             c->chrXInc += 20;

  1297.         }

  1298.         // we don't use the x86 asm scaler if MMX is available

  1299.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1300.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1301.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1302.         }

  1303.     }

  1304. 

  1305. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1306. 

  1307.     /* precalculate horizontal scaler filter coefficients */

  1308.     {

  1309. #if HAVE_MMXEXT_INLINE

  1310. // can't downscale !!!

  1311.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1312.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1313.                                                              NULL, NULL, 8);

  1314.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1315.                                                              NULL, NULL, NULL, 4);

  1316. 

  1317. #if USE_MMAP

  1318.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1319.                                           PROT_READ | PROT_WRITE,

  1320.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1321.                                           -1, 0);

  1322.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1323.                                           PROT_READ | PROT_WRITE,

  1324.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1325.                                           -1, 0);

  1326. #elif HAVE_VIRTUALALLOC

  1327.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1328.                                                   c->lumMmxextFilterCodeSize,

  1329.                                                   MEM_COMMIT,

  1330.                                                   PAGE_EXECUTE_READWRITE);

  1331.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1332.                                                   c->chrMmxextFilterCodeSize,

  1333.                                                   MEM_COMMIT,

  1334.                                                   PAGE_EXECUTE_READWRITE);

  1335. #else

  1336.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1337.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1338. #endif

  1339. 

  1340. #ifdef MAP_ANONYMOUS

  1341.             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

  1342. #else

  1343.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1344. #endif

  1345.             {

  1346.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1347.                 return AVERROR(ENOMEM);

  1348.             }

  1349. 

  1350.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1351.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1352.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1353.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1354. 

  1355.             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,

  1356.                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1357.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1358.                                 c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1359. 

  1360. #if USE_MMAP

  1361.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1362.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1363. #endif

  1364.         } else

  1365. #endif /* HAVE_MMXEXT_INLINE */

  1366.         {

  1367.             const int filterAlign =

  1368.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1369.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1370.                 1;

  1371. 

  1372.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1373.                            &c->hLumFilterSize, c->lumXInc,

  1374.                            srcW, dstW, filterAlign, 1 << 14,

  1375.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1376.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1377.                            c->param) < 0)

  1378.                 goto fail;

  1379.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1380.                            &c->hChrFilterSize, c->chrXInc,

  1381.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1382.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1383.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1384.                            c->param) < 0)

  1385.                 goto fail;

  1386.         }

  1387.     } // initialize horizontal stuff

  1388. 

  1389.     /* precalculate vertical scaler filter coefficients */

  1390.     {

  1391.         const int filterAlign =

  1392.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1393.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1394.             1;

  1395. 

  1396.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1397.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1398.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1399.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1400.                        c->param) < 0)

  1401.             goto fail;

  1402.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1403.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1404.                        filterAlign, (1 << 12),

  1405.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1406.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1407.                        c->param) < 0)

  1408.             goto fail;

  1409. 

  1410. #if HAVE_ALTIVEC

  1411.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1412.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1413. 

  1414.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1415.             int j;

  1416.             short *p = (short *)&c->vYCoeffsBank[i];

  1417.             for (j = 0; j < 8; j++)

  1418.                 p[j] = c->vLumFilter[i];

  1419.         }

  1420. 

  1421.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1422.             int j;

  1423.             short *p = (short *)&c->vCCoeffsBank[i];

  1424.             for (j = 0; j < 8; j++)

  1425.                 p[j] = c->vChrFilter[i];

  1426.         }

  1427. #endif

  1428.     }

  1429. 

  1430.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1431.     c->vLumBufSize = c->vLumFilterSize;

  1432.     c->vChrBufSize = c->vChrFilterSize;

  1433.     for (i = 0; i < dstH; i++) {

  1434.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1435.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1436.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1437.                                << c->chrSrcVSubSample));

  1438. 

  1439.         nextSlice >>= c->chrSrcVSubSample;

  1440.         nextSlice <<= c->chrSrcVSubSample;

  1441.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1442.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1443.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1444.             (nextSlice >> c->chrSrcVSubSample))

  1445.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1446.                              c->vChrFilterPos[chrI];

  1447.     }

  1448. 

  1449.     for (i = 0; i < 4; i++)

  1450.         FF_ALLOCZ_OR_GOTO(c, c->dither_error[i], (c->dstW+2) * sizeof(int), fail);

  1451. 

  1452.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1453.      * need to allocate several megabytes to handle all possible cases) */

  1454.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1455.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1456.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1457.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1458.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1459.     /* Note we need at least one pixel more at the end because of the MMX code

  1460.      * (just in case someone wants to replace the 4000/8000). */

  1461.     /* align at 16 bytes for AltiVec */

  1462.     for (i = 0; i < c->vLumBufSize; i++) {

  1463.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1464.                           dst_stride + 16, fail);

  1465.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1466.     }

  1467.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1468.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1469.     c->uv_offx2 = dst_stride + 16;

  1470.     for (i = 0; i < c->vChrBufSize; i++) {

  1471.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1472.                          dst_stride * 2 + 32, fail);

  1473.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1474.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1475.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1476.     }

  1477.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1478.         for (i = 0; i < c->vLumBufSize; i++) {

  1479.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1480.                               dst_stride + 16, fail);

  1481.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1482.         }

  1483. 

  1484.     // try to avoid drawing green stuff between the right end and the stride end

  1485.     for (i = 0; i < c->vChrBufSize; i++)

  1486.         if(desc_dst->comp[0].depth_minus1 == 15){

  1487.             av_assert0(c->dstBpc > 14);

  1488.             for(j=0; j<dst_stride/2+1; j++)

  1489.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1490.         } else

  1491.             for(j=0; j<dst_stride+1; j++)

  1492.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1493. 

  1494.     av_assert0(c->chrDstH <= dstH);

  1495. 

  1496.     if (flags & SWS_PRINT_INFO) {

  1497.         if (flags & SWS_FAST_BILINEAR)

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

  1499.         else if (flags & SWS_BILINEAR)

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

  1501.         else if (flags & SWS_BICUBIC)

  1502.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1503.         else if (flags & SWS_X)

  1504.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1505.         else if (flags & SWS_POINT)

  1506.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1507.         else if (flags & SWS_AREA)

  1508.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1509.         else if (flags & SWS_BICUBLIN)

  1510.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1511.         else if (flags & SWS_GAUSS)

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

  1513.         else if (flags & SWS_SINC)

  1514.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1515.         else if (flags & SWS_LANCZOS)

  1516.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1517.         else if (flags & SWS_SPLINE)

  1518.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1519.         else

  1520.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1521. 

  1522.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1523.                av_get_pix_fmt_name(srcFormat),

  1524. #ifdef DITHER1XBPP

  1525.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1526.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1527.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1528.                                                              "dithered " : "",

  1529. #else

  1530.                "",

  1531. #endif

  1532.                av_get_pix_fmt_name(dstFormat));

  1533. 

  1534.         if (INLINE_MMXEXT(cpu_flags))

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

  1536.         else if (INLINE_AMD3DNOW(cpu_flags))

  1537.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1538.         else if (INLINE_MMX(cpu_flags))

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

  1540.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1541.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1542.         else

  1543.             av_log(c, AV_LOG_INFO, "using C\n");

  1544. 

  1545.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1546.         av_log(c, AV_LOG_DEBUG,

  1547.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1548.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1549.         av_log(c, AV_LOG_DEBUG,

  1550.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1551.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1552.                c->chrXInc, c->chrYInc);

  1553.     }

  1554. 

  1555.     c->swScale = ff_getSwsFunc(c);

  1556.     return 0;

  1557. fail: // FIXME replace things by appropriate error codes

  1558.     return -1;

  1559. }

  1560. 

  1561. #if FF_API_SWS_GETCONTEXT

  1562. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1563.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1564.                            int flags, SwsFilter *srcFilter,

  1565.                            SwsFilter *dstFilter, const double *param)

  1566. {

  1567.     SwsContext *c;

  1568. 

  1569.     if (!(c = sws_alloc_context()))

  1570.         return NULL;

  1571. 

  1572.     c->flags     = flags;

  1573.     c->srcW      = srcW;

  1574.     c->srcH      = srcH;

  1575.     c->dstW      = dstW;

  1576.     c->dstH      = dstH;

  1577.     c->srcRange  = handle_jpeg(&srcFormat);

  1578.     c->dstRange  = handle_jpeg(&dstFormat);

  1579.     c->src0Alpha = handle_0alpha(&srcFormat);

  1580.     c->dst0Alpha = handle_0alpha(&dstFormat);

  1581.     c->srcXYZ    = handle_xyz(&srcFormat);

  1582.     c->dstXYZ    = handle_xyz(&dstFormat);

  1583.     c->srcFormat = srcFormat;

  1584.     c->dstFormat = dstFormat;

  1585. 

  1586.     if (param) {

  1587.         c->param[0] = param[0];

  1588.         c->param[1] = param[1];

  1589.     }

  1590.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1591.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1592.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1593. 

  1594.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1595.         sws_freeContext(c);

  1596.         return NULL;

  1597.     }

  1598. 

  1599.     return c;

  1600. }

  1601. #endif

  1602. 

  1603. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1604.                                 float lumaSharpen, float chromaSharpen,

  1605.                                 float chromaHShift, float chromaVShift,

  1606.                                 int verbose)

  1607. {

  1608.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1609.     if (!filter)

  1610.         return NULL;

  1611. 

  1612.     if (lumaGBlur != 0.0) {

  1613.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1614.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1615.     } else {

  1616.         filter->lumH = sws_getIdentityVec();

  1617.         filter->lumV = sws_getIdentityVec();

  1618.     }

  1619. 

  1620.     if (chromaGBlur != 0.0) {

  1621.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1622.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1623.     } else {

  1624.         filter->chrH = sws_getIdentityVec();

  1625.         filter->chrV = sws_getIdentityVec();

  1626.     }

  1627. 

  1628.     if (chromaSharpen != 0.0) {

  1629.         SwsVector *id = sws_getIdentityVec();

  1630.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1631.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1632.         sws_addVec(filter->chrH, id);

  1633.         sws_addVec(filter->chrV, id);

  1634.         sws_freeVec(id);

  1635.     }

  1636. 

  1637.     if (lumaSharpen != 0.0) {

  1638.         SwsVector *id = sws_getIdentityVec();

  1639.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1640.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1641.         sws_addVec(filter->lumH, id);

  1642.         sws_addVec(filter->lumV, id);

  1643.         sws_freeVec(id);

  1644.     }

  1645. 

  1646.     if (chromaHShift != 0.0)

  1647.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1648. 

  1649.     if (chromaVShift != 0.0)

  1650.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1651. 

  1652.     sws_normalizeVec(filter->chrH, 1.0);

  1653.     sws_normalizeVec(filter->chrV, 1.0);

  1654.     sws_normalizeVec(filter->lumH, 1.0);

  1655.     sws_normalizeVec(filter->lumV, 1.0);

  1656. 

  1657.     if (verbose)

  1658.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1659.     if (verbose)

  1660.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1661. 

  1662.     return filter;

  1663. }

  1664. 

  1665. SwsVector *sws_allocVec(int length)

  1666. {

  1667.     SwsVector *vec;

  1668. 

  1669.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1670.         return NULL;

  1671. 

  1672.     vec = av_malloc(sizeof(SwsVector));

  1673.     if (!vec)

  1674.         return NULL;

  1675.     vec->length = length;

  1676.     vec->coeff  = av_malloc(sizeof(double) * length);

  1677.     if (!vec->coeff)

  1678.         av_freep(&vec);

  1679.     return vec;

  1680. }

  1681. 

  1682. SwsVector *sws_getGaussianVec(double variance, double quality)

  1683. {

  1684.     const int length = (int)(variance * quality + 0.5) | 1;

  1685.     int i;

  1686.     double middle  = (length - 1) * 0.5;

  1687.     SwsVector *vec;

  1688. 

  1689.     if(variance < 0 || quality < 0)

  1690.         return NULL;

  1691. 

  1692.     vec = sws_allocVec(length);

  1693. 

  1694.     if (!vec)

  1695.         return NULL;

  1696. 

  1697.     for (i = 0; i < length; i++) {

  1698.         double dist = i - middle;

  1699.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1700.                         sqrt(2 * variance * M_PI);

  1701.     }

  1702. 

  1703.     sws_normalizeVec(vec, 1.0);

  1704. 

  1705.     return vec;

  1706. }

  1707. 

  1708. SwsVector *sws_getConstVec(double c, int length)

  1709. {

  1710.     int i;

  1711.     SwsVector *vec = sws_allocVec(length);

  1712. 

  1713.     if (!vec)

  1714.         return NULL;

  1715. 

  1716.     for (i = 0; i < length; i++)

  1717.         vec->coeff[i] = c;

  1718. 

  1719.     return vec;

  1720. }

  1721. 

  1722. SwsVector *sws_getIdentityVec(void)

  1723. {

  1724.     return sws_getConstVec(1.0, 1);

  1725. }

  1726. 

  1727. static double sws_dcVec(SwsVector *a)

  1728. {

  1729.     int i;

  1730.     double sum = 0;

  1731. 

  1732.     for (i = 0; i < a->length; i++)

  1733.         sum += a->coeff[i];

  1734. 

  1735.     return sum;

  1736. }

  1737. 

  1738. void sws_scaleVec(SwsVector *a, double scalar)

  1739. {

  1740.     int i;

  1741. 

  1742.     for (i = 0; i < a->length; i++)

  1743.         a->coeff[i] *= scalar;

  1744. }

  1745. 

  1746. void sws_normalizeVec(SwsVector *a, double height)

  1747. {

  1748.     sws_scaleVec(a, height / sws_dcVec(a));

  1749. }

  1750. 

  1751. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1752. {

  1753.     int length = a->length + b->length - 1;

  1754.     int i, j;

  1755.     SwsVector *vec = sws_getConstVec(0.0, length);

  1756. 

  1757.     if (!vec)

  1758.         return NULL;

  1759. 

  1760.     for (i = 0; i < a->length; i++) {

  1761.         for (j = 0; j < b->length; j++) {

  1762.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1763.         }

  1764.     }

  1765. 

  1766.     return vec;

  1767. }

  1768. 

  1769. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1770. {

  1771.     int length = FFMAX(a->length, b->length);

  1772.     int i;

  1773.     SwsVector *vec = sws_getConstVec(0.0, length);

  1774. 

  1775.     if (!vec)

  1776.         return NULL;

  1777. 

  1778.     for (i = 0; i < a->length; i++)

  1779.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1780.     for (i = 0; i < b->length; i++)

  1781.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1782. 

  1783.     return vec;

  1784. }

  1785. 

  1786. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1787. {

  1788.     int length = FFMAX(a->length, b->length);

  1789.     int i;

  1790.     SwsVector *vec = sws_getConstVec(0.0, length);

  1791. 

  1792.     if (!vec)

  1793.         return NULL;

  1794. 

  1795.     for (i = 0; i < a->length; i++)

  1796.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1797.     for (i = 0; i < b->length; i++)

  1798.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1799. 

  1800.     return vec;

  1801. }

  1802. 

  1803. /* shift left / or right if "shift" is negative */

  1804. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1805. {

  1806.     int length = a->length + FFABS(shift) * 2;

  1807.     int i;

  1808.     SwsVector *vec = sws_getConstVec(0.0, length);

  1809. 

  1810.     if (!vec)

  1811.         return NULL;

  1812. 

  1813.     for (i = 0; i < a->length; i++) {

  1814.         vec->coeff[i + (length    - 1) / 2 -

  1815.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1816.     }

  1817. 

  1818.     return vec;

  1819. }

  1820. 

  1821. void sws_shiftVec(SwsVector *a, int shift)

  1822. {

  1823.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1824.     av_free(a->coeff);

  1825.     a->coeff  = shifted->coeff;

  1826.     a->length = shifted->length;

  1827.     av_free(shifted);

  1828. }

  1829. 

  1830. void sws_addVec(SwsVector *a, SwsVector *b)

  1831. {

  1832.     SwsVector *sum = sws_sumVec(a, b);

  1833.     av_free(a->coeff);

  1834.     a->coeff  = sum->coeff;

  1835.     a->length = sum->length;

  1836.     av_free(sum);

  1837. }

  1838. 

  1839. void sws_subVec(SwsVector *a, SwsVector *b)

  1840. {

  1841.     SwsVector *diff = sws_diffVec(a, b);

  1842.     av_free(a->coeff);

  1843.     a->coeff  = diff->coeff;

  1844.     a->length = diff->length;

  1845.     av_free(diff);

  1846. }

  1847. 

  1848. void sws_convVec(SwsVector *a, SwsVector *b)

  1849. {

  1850.     SwsVector *conv = sws_getConvVec(a, b);

  1851.     av_free(a->coeff);

  1852.     a->coeff  = conv->coeff;

  1853.     a->length = conv->length;

  1854.     av_free(conv);

  1855. }

  1856. 

  1857. SwsVector *sws_cloneVec(SwsVector *a)

  1858. {

  1859.     int i;

  1860.     SwsVector *vec = sws_allocVec(a->length);

  1861. 

  1862.     if (!vec)

  1863.         return NULL;

  1864. 

  1865.     for (i = 0; i < a->length; i++)

  1866.         vec->coeff[i] = a->coeff[i];

  1867. 

  1868.     return vec;

  1869. }

  1870. 

  1871. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1872. {

  1873.     int i;

  1874.     double max = 0;

  1875.     double min = 0;

  1876.     double range;

  1877. 

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

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

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

  1881. 

  1882.     for (i = 0; i < a->length; i++)

  1883.         if (a->coeff[i] < min)

  1884.             min = a->coeff[i];

  1885. 

  1886.     range = max - min;

  1887. 

  1888.     for (i = 0; i < a->length; i++) {

  1889.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1890.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1891.         for (; x > 0; x--)

  1892.             av_log(log_ctx, log_level, " ");

  1893.         av_log(log_ctx, log_level, "|\n");

  1894.     }

  1895. }

  1896. 

  1897. void sws_freeVec(SwsVector *a)

  1898. {

  1899.     if (!a)

  1900.         return;

  1901.     av_freep(&a->coeff);

  1902.     a->length = 0;

  1903.     av_free(a);

  1904. }

  1905. 

  1906. void sws_freeFilter(SwsFilter *filter)

  1907. {

  1908.     if (!filter)

  1909.         return;

  1910. 

  1911.     if (filter->lumH)

  1912.         sws_freeVec(filter->lumH);

  1913.     if (filter->lumV)

  1914.         sws_freeVec(filter->lumV);

  1915.     if (filter->chrH)

  1916.         sws_freeVec(filter->chrH);

  1917.     if (filter->chrV)

  1918.         sws_freeVec(filter->chrV);

  1919.     av_free(filter);

  1920. }

  1921. 

  1922. void sws_freeContext(SwsContext *c)

  1923. {

  1924.     int i;

  1925.     if (!c)

  1926.         return;

  1927. 

  1928.     if (c->lumPixBuf) {

  1929.         for (i = 0; i < c->vLumBufSize; i++)

  1930.             av_freep(&c->lumPixBuf[i]);

  1931.         av_freep(&c->lumPixBuf);

  1932.     }

  1933. 

  1934.     if (c->chrUPixBuf) {

  1935.         for (i = 0; i < c->vChrBufSize; i++)

  1936.             av_freep(&c->chrUPixBuf[i]);

  1937.         av_freep(&c->chrUPixBuf);

  1938.         av_freep(&c->chrVPixBuf);

  1939.     }

  1940. 

  1941.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1942.         for (i = 0; i < c->vLumBufSize; i++)

  1943.             av_freep(&c->alpPixBuf[i]);

  1944.         av_freep(&c->alpPixBuf);

  1945.     }

  1946. 

  1947.     for (i = 0; i < 4; i++)

  1948.         av_freep(&c->dither_error[i]);

  1949. 

  1950.     av_freep(&c->vLumFilter);

  1951.     av_freep(&c->vChrFilter);

  1952.     av_freep(&c->hLumFilter);

  1953.     av_freep(&c->hChrFilter);

  1954. #if HAVE_ALTIVEC

  1955.     av_freep(&c->vYCoeffsBank);

  1956.     av_freep(&c->vCCoeffsBank);

  1957. #endif

  1958. 

  1959.     av_freep(&c->vLumFilterPos);

  1960.     av_freep(&c->vChrFilterPos);

  1961.     av_freep(&c->hLumFilterPos);

  1962.     av_freep(&c->hChrFilterPos);

  1963. 

  1964. #if HAVE_MMX_INLINE

  1965. #if USE_MMAP

  1966.     if (c->lumMmxextFilterCode)

  1967.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1968.     if (c->chrMmxextFilterCode)

  1969.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1970. #elif HAVE_VIRTUALALLOC

  1971.     if (c->lumMmxextFilterCode)

  1972.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1973.     if (c->chrMmxextFilterCode)

  1974.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1975. #else

  1976.     av_free(c->lumMmxextFilterCode);

  1977.     av_free(c->chrMmxextFilterCode);

  1978. #endif

  1979.     c->lumMmxextFilterCode = NULL;

  1980.     c->chrMmxextFilterCode = NULL;

  1981. #endif /* HAVE_MMX_INLINE */

  1982. 

  1983.     av_freep(&c->yuvTable);

  1984.     av_freep(&c->formatConvBuffer);

  1985. 

  1986.     av_free(c);

  1987. }

  1988. 

  1989. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1990.                                         int srcH, enum AVPixelFormat srcFormat,

  1991.                                         int dstW, int dstH,

  1992.                                         enum AVPixelFormat dstFormat, int flags,

  1993.                                         SwsFilter *srcFilter,

  1994.                                         SwsFilter *dstFilter,

  1995.                                         const double *param)

  1996. {

  1997.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1998.                                              SWS_PARAM_DEFAULT };

  1999. 

  2000.     if (!param)

  2001.         param = default_param;

  2002. 

  2003.     if (context &&

  2004.         (context->srcW      != srcW      ||

  2005.          context->srcH      != srcH      ||

  2006.          context->srcFormat != srcFormat ||

  2007.          context->dstW      != dstW      ||

  2008.          context->dstH      != dstH      ||

  2009.          context->dstFormat != dstFormat ||

  2010.          context->flags     != flags     ||

  2011.          context->param[0]  != param[0]  ||

  2012.          context->param[1]  != param[1])) {

  2013.         sws_freeContext(context);

  2014.         context = NULL;

  2015.     }

  2016. 

  2017.     if (!context) {

  2018.         if (!(context = sws_alloc_context()))

  2019.             return NULL;

  2020.         context->srcW      = srcW;

  2021.         context->srcH      = srcH;

  2022.         context->srcRange  = handle_jpeg(&srcFormat);

  2023.         context->src0Alpha = handle_0alpha(&srcFormat);

  2024.         context->srcXYZ    = handle_xyz(&srcFormat);

  2025.         context->srcFormat = srcFormat;

  2026.         context->dstW      = dstW;

  2027.         context->dstH      = dstH;

  2028.         context->dstRange  = handle_jpeg(&dstFormat);

  2029.         context->dst0Alpha = handle_0alpha(&dstFormat);

  2030.         context->dstXYZ    = handle_xyz(&dstFormat);

  2031.         context->dstFormat = dstFormat;

  2032.         context->flags     = flags;

  2033.         context->param[0]  = param[0];

  2034.         context->param[1]  = param[1];

  2035.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  2036.                                  context->srcRange,

  2037.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  2038.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  2039.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  2040.             sws_freeContext(context);

  2041.             return NULL;

  2042.         }

  2043.     }

  2044.     return context;

  2045. }