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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 Libav.

  5.  *

  6.  * Libav 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.  * Libav 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 Libav; 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. #include <assert.h>

  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/avutil.h"

  42. #include "libavutil/bswap.h"

  43. #include "libavutil/cpu.h"

  44. #include "libavutil/intreadwrite.h"

  45. #include "libavutil/mathematics.h"

  46. #include "libavutil/opt.h"

  47. #include "libavutil/pixdesc.h"

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

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

  50. #include "rgb2rgb.h"

  51. #include "swscale.h"

  52. #include "swscale_internal.h"

  53. 

  54. unsigned swscale_version(void)

  55. {

  56.     return LIBSWSCALE_VERSION_INT;

  57. }

  58. 

  59. const char *swscale_configuration(void)

  60. {

  61.     return LIBAV_CONFIGURATION;

  62. }

  63. 

  64. const char *swscale_license(void)

  65. {

  66. #define LICENSE_PREFIX "libswscale license: "

  67.     return LICENSE_PREFIX LIBAV_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  68. }

  69. 

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

  71. 

  72. typedef struct FormatEntry {

  73.     int is_supported_in, is_supported_out;

  74. } FormatEntry;

  75. 

  76. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  173. };

  174. 

  175. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  176. {

  177.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  178.            format_entries[pix_fmt].is_supported_in : 0;

  179. }

  180. 

  181. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  182. {

  183.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  184.            format_entries[pix_fmt].is_supported_out : 0;

  185. }

  186. 

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

  188. 

  189. const char *sws_format_name(enum AVPixelFormat format)

  190. {

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

  192.     if (desc)

  193.         return desc->name;

  194.     else

  195.         return "Unknown format";

  196. }

  197. 

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

  199.                              double dist)

  200. {

  201.     if (dist <= 1.0)

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

  203.     else

  204.         return getSplineCoeff(0.0,

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

  206.                                c + 3.0 * d,

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

  208.                               dist - 1.0);

  209. }

  210. 

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

  212.                               int *outFilterSize, int xInc, int srcW,

  213.                               int dstW, int filterAlign, int one,

  214.                               int flags, int cpu_flags,

  215.                               SwsVector *srcFilter, SwsVector *dstFilter,

  216.                               double param[2], int is_horizontal)

  217. {

  218.     int i;

  219.     int filterSize;

  220.     int filter2Size;

  221.     int minFilterSize;

  222.     int64_t *filter    = NULL;

  223.     int64_t *filter2   = NULL;

  224.     const int64_t fone = 1LL << 54;

  225.     int ret            = -1;

  226. 

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

  228. 

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

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

  231. 

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

  233.         int i;

  234.         filterSize = 1;

  235.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  237. 

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

  239.             filter[i * filterSize] = fone;

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

  241.         }

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

  243.         int i;

  244.         int xDstInSrc;

  245.         filterSize = 1;

  246.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  248. 

  249.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  252. 

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

  254.             filter[i]       = fone;

  255.             xDstInSrc      += xInc;

  256.         }

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

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

  259.         int i;

  260.         int xDstInSrc;

  261.         filterSize = 2;

  262.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  264. 

  265.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  268.             int j;

  269. 

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

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

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

  273.                 int64_t coeff = fone - FFABS((xx << 16) - xDstInSrc) *

  274.                                 (fone >> 16);

  275.                 if (coeff < 0)

  276.                     coeff = 0;

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

  278.                 xx++;

  279.             }

  280.             xDstInSrc += xInc;

  281.         }

  282.     } else {

  283.         int64_t xDstInSrc;

  284.         int sizeFactor;

  285. 

  286.         if (flags & SWS_BICUBIC)

  287.             sizeFactor = 4;

  288.         else if (flags & SWS_X)

  289.             sizeFactor = 8;

  290.         else if (flags & SWS_AREA)

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

  292.         else if (flags & SWS_GAUSS)

  293.             sizeFactor = 8;     // infinite ;)

  294.         else if (flags & SWS_LANCZOS)

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

  296.         else if (flags & SWS_SINC)

  297.             sizeFactor = 20;    // infinite ;)

  298.         else if (flags & SWS_SPLINE)

  299.             sizeFactor = 20;    // infinite ;)

  300.         else if (flags & SWS_BILINEAR)

  301.             sizeFactor = 2;

  302.         else {

  303.             sizeFactor = 0;     // GCC warning killer

  304.             assert(0);

  305.         }

  306. 

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

  308.             filterSize = 1 + sizeFactor;    // upscale

  309.         else

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

  311. 

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

  313.         filterSize = FFMAX(filterSize, 1);

  314. 

  315.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  317. 

  318.         xDstInSrc = xInc - 0x10000;

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

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

  321.             int j;

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

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

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

  325.                 double floatd;

  326.                 int64_t coeff;

  327. 

  328.                 if (xInc > 1 << 16)

  329.                     d = d * dstW / srcW;

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

  331. 

  332.                 if (flags & SWS_BICUBIC) {

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

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

  335. 

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

  337.                         coeff = 0.0;

  338.                     } else {

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

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

  341. 

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

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

  344.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  345.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  346.                         else

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

  348.                                       (6 * B + 30 * C) * dd  +

  349.                                     (-12 * B - 48 * C) * d   +

  350.                                       (8 * B + 24 * C) * (1 << 30);

  351.                     }

  352.                     coeff *= fone >> (30 + 24);

  353.                 }

  354. #if 0

  355.                 else if (flags & SWS_X) {

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

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

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

  359.                 }

  360. #endif

  361.                 else if (flags & SWS_X) {

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

  363.                     double c;

  364. 

  365.                     if (floatd < 1.0)

  366.                         c = cos(floatd * M_PI);

  367.                     else

  368.                         c = -1.0;

  369.                     if (c < 0.0)

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

  371.                     else

  372.                         c = pow(c, A);

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

  374.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  380.                     else

  381.                         coeff = 0.0;

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

  383.                 } else if (flags & SWS_GAUSS) {

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

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

  386.                 } else if (flags & SWS_SINC) {

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

  388.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  392.                     if (floatd > p)

  393.                         coeff = 0;

  394.                 } else if (flags & SWS_BILINEAR) {

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

  396.                     if (coeff < 0)

  397.                         coeff = 0;

  398.                     coeff *= fone >> 30;

  399.                 } else if (flags & SWS_SPLINE) {

  400.                     double p = -2.196152422706632;

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

  402.                 } else {

  403.                     coeff = 0.0; // GCC warning killer

  404.                     assert(0);

  405.                 }

  406. 

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

  408.                 xx++;

  409.             }

  410.             xDstInSrc += 2 * xInc;

  411.         }

  412.     }

  413. 

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

  415.      * av_free(filter);

  416.      */

  417.     assert(filterSize > 0);

  418.     filter2Size = filterSize;

  419.     if (srcFilter)

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

  421.     if (dstFilter)

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

  423.     assert(filter2Size > 0);

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

  425. 

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

  427.         int j, k;

  428. 

  429.         if (srcFilter) {

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

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

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

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

  434.             }

  435.         } else {

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

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

  438.         }

  439.         // FIXME dstFilter

  440. 

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

  442.     }

  443.     av_freep(&filter);

  444. 

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

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

  447.     minFilterSize = 0;

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

  449.         int min = filter2Size;

  450.         int j;

  451.         int64_t cutOff = 0.0;

  452. 

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

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

  455.             int k;

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

  457. 

  458.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  459.                 break;

  460. 

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

  462.              * filter otherwise */

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

  464.                 break;

  465. 

  466.             // move filter coefficients left

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

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

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

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

  471.         }

  472. 

  473.         cutOff = 0;

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

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

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

  477. 

  478.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  479.                 break;

  480.             min--;

  481.         }

  482. 

  483.         if (min > minFilterSize)

  484.             minFilterSize = min;

  485.     }

  486. 

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

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

  489.         if (minFilterSize < 5)

  490.             filterAlign = 4;

  491. 

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

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

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

  495.         if (minFilterSize < 3)

  496.             filterAlign = 1;

  497.     }

  498. 

  499.     if (INLINE_MMX(cpu_flags)) {

  500.         // special case for unscaled vertical filtering

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

  502.             filterAlign = 1;

  503.     }

  504. 

  505.     assert(minFilterSize > 0);

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

  507.     assert(filterSize > 0);

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

  509.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  511.         goto fail;

  512.     *outFilterSize = filterSize;

  513. 

  514.     if (flags & SWS_PRINT_INFO)

  515.         av_log(NULL, AV_LOG_VERBOSE,

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

  517.                filter2Size, filterSize);

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

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

  520.         int j;

  521. 

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

  523.             if (j >= filter2Size)

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

  525.             else

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

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

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

  529.         }

  530.     }

  531. 

  532.     // FIXME try to align filterPos if possible

  533. 

  534.     // fix borders

  535.     if (is_horizontal) {

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

  537.             int j;

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

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

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

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

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

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

  544.                 }

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

  546.             }

  547. 

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

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

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

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

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

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

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

  555.                 }

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

  557.             }

  558.         }

  559.     }

  560. 

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

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

  563.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  565. 

  566.     /* normalize & store in outFilter */

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

  568.         int j;

  569.         int64_t error = 0;

  570.         int64_t sum   = 0;

  571. 

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

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

  574.         }

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

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

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

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

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

  580.             error                                  = v - intV * sum;

  581.         }

  582.     }

  583. 

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

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

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

  587.                                                       * read over the end */

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

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

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

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

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

  593.     }

  594. 

  595.     ret = 0;

  596. 

  597. fail:

  598.     av_free(filter);

  599.     av_free(filter2);

  600.     return ret;

  601. }

  602. 

  603. #if HAVE_MMXEXT_INLINE

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

  605.                                        int16_t *filter, int32_t *filterPos,

  606.                                        int numSplits)

  607. {

  608.     uint8_t *fragmentA;

  609.     x86_reg imm8OfPShufW1A;

  610.     x86_reg imm8OfPShufW2A;

  611.     x86_reg fragmentLengthA;

  612.     uint8_t *fragmentB;

  613.     x86_reg imm8OfPShufW1B;

  614.     x86_reg imm8OfPShufW2B;

  615.     x86_reg fragmentLengthB;

  616.     int fragmentPos;

  617. 

  618.     int xpos, i;

  619. 

  620.     // create an optimized horizontal scaling routine

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

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

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

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

  625.      */

  626. 

  627.     // code fragment

  628. 

  629.     __asm__ volatile (

  630.         "jmp                         9f                 \n\t"

  631.         // Begin

  632.         "0:                                             \n\t"

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

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

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

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

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

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

  639.         "1:                                             \n\t"

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

  641.         "2:                                             \n\t"

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

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

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

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

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

  647. 

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

  649. 

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

  651.         // End

  652.         "9:                                             \n\t"

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

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

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

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

  657.         "dec                         %1                 \n\t"

  658.         "dec                         %2                 \n\t"

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

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

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

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

  663. 

  664. 

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

  666.           "=r" (fragmentLengthA)

  667.         );

  668. 

  669.     __asm__ volatile (

  670.         "jmp                         9f                 \n\t"

  671.         // Begin

  672.         "0:                                             \n\t"

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

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

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

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

  677.         "1:                                             \n\t"

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

  679.         "2:                                             \n\t"

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

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

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

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

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

  685. 

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

  687. 

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

  689.         // End

  690.         "9:                                             \n\t"

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

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

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

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

  695.         "dec                         %1                 \n\t"

  696.         "dec                         %2                 \n\t"

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

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

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

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

  701. 

  702. 

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

  704.           "=r" (fragmentLengthB)

  705.         );

  706. 

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

  708.     fragmentPos = 0;

  709. 

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

  711.         int xx = xpos >> 16;

  712. 

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

  714.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  724.             int shift              = 0;

  725. 

  726.             if (filterCode) {

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

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

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

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

  731.                 filterPos[i / 2] = xx;

  732. 

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

  734. 

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

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

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

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

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

  740.                                                                (c << 4) |

  741.                                                                (d << 6);

  742. 

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

  744.                     shift = maxShift;               // avoid overread

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

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

  747. 

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

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

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

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

  752.                 }

  753.             }

  754. 

  755.             fragmentPos += fragmentLength;

  756. 

  757.             if (filterCode)

  758.                 filterCode[fragmentPos] = RET;

  759.         }

  760.         xpos += xInc;

  761.     }

  762.     if (filterCode)

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

  764. 

  765.     return fragmentPos + 1;

  766. }

  767. #endif /* HAVE_MMXEXT_INLINE */

  768. 

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

  770. {

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

  772.     *h = desc->log2_chroma_w;

  773.     *v = desc->log2_chroma_h;

  774. }

  775. 

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

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

  778.                              int brightness, int contrast, int saturation)

  779. {

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

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

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

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

  784. 

  785.     c->brightness = brightness;

  786.     c->contrast   = contrast;

  787.     c->saturation = saturation;

  788.     c->srcRange   = srcRange;

  789.     c->dstRange   = dstRange;

  790.     if (isYUV(c->dstFormat) || isGray(c->dstFormat))

  791.         return -1;

  792. 

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

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

  795. 

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

  797.                              contrast, saturation);

  798.     // FIXME factorize

  799. 

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

  801.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  802.                                        contrast, saturation);

  803.     return 0;

  804. }

  805. 

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

  807.                              int *srcRange, int **table, int *dstRange,

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

  809. {

  810.     if (isYUV(c->dstFormat) || isGray(c->dstFormat))

  811.         return -1;

  812. 

  813.     *inv_table  = c->srcColorspaceTable;

  814.     *table      = c->dstColorspaceTable;

  815.     *srcRange   = c->srcRange;

  816.     *dstRange   = c->dstRange;

  817.     *brightness = c->brightness;

  818.     *contrast   = c->contrast;

  819.     *saturation = c->saturation;

  820. 

  821.     return 0;

  822. }

  823. 

  824. static int handle_jpeg(enum AVPixelFormat *format)

  825. {

  826.     switch (*format) {

  827.     case AV_PIX_FMT_YUVJ420P:

  828.         *format = AV_PIX_FMT_YUV420P;

  829.         return 1;

  830.     case AV_PIX_FMT_YUVJ422P:

  831.         *format = AV_PIX_FMT_YUV422P;

  832.         return 1;

  833.     case AV_PIX_FMT_YUVJ444P:

  834.         *format = AV_PIX_FMT_YUV444P;

  835.         return 1;

  836.     case AV_PIX_FMT_YUVJ440P:

  837.         *format = AV_PIX_FMT_YUV440P;

  838.         return 1;

  839.     default:

  840.         return 0;

  841.     }

  842. }

  843. 

  844. SwsContext *sws_alloc_context(void)

  845. {

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

  847. 

  848.     if (c) {

  849.         c->av_class = &sws_context_class;

  850.         av_opt_set_defaults(c);

  851.     }

  852. 

  853.     return c;

  854. }

  855. 

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

  857.                              SwsFilter *dstFilter)

  858. {

  859.     int i;

  860.     int usesVFilter, usesHFilter;

  861.     int unscaled;

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

  863.     int srcW              = c->srcW;

  864.     int srcH              = c->srcH;

  865.     int dstW              = c->dstW;

  866.     int dstH              = c->dstH;

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

  868.     int dst_stride_px     = dst_stride >> 1;

  869.     int flags, cpu_flags;

  870.     enum AVPixelFormat srcFormat = c->srcFormat;

  871.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  874. 

  875.     cpu_flags = av_get_cpu_flags();

  876.     flags     = c->flags;

  877.     emms_c();

  878.     if (!rgb15to16)

  879.         sws_rgb2rgb_init();

  880. 

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

  882. 

  883.     if (!sws_isSupportedInput(srcFormat)) {

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

  885.                sws_format_name(srcFormat));

  886.         return AVERROR(EINVAL);

  887.     }

  888.     if (!sws_isSupportedOutput(dstFormat)) {

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

  890.                sws_format_name(dstFormat));

  891.         return AVERROR(EINVAL);

  892.     }

  893. 

  894.     i = flags & (SWS_POINT         |

  895.                  SWS_AREA          |

  896.                  SWS_BILINEAR      |

  897.                  SWS_FAST_BILINEAR |

  898.                  SWS_BICUBIC       |

  899.                  SWS_X             |

  900.                  SWS_GAUSS         |

  901.                  SWS_LANCZOS       |

  902.                  SWS_SINC          |

  903.                  SWS_SPLINE        |

  904.                  SWS_BICUBLIN);

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

  906.         av_log(c, AV_LOG_ERROR,

  907.                "Exactly one scaler algorithm must be chosen\n");

  908.         return AVERROR(EINVAL);

  909.     }

  910.     /* sanity check */

  911.     if (srcW < 4 || srcH < 1 || dstW < 8 || dstH < 1) {

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

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

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

  915.                srcW, srcH, dstW, dstH);

  916.         return AVERROR(EINVAL);

  917.     }

  918. 

  919.     if (!dstFilter)

  920.         dstFilter = &dummyFilter;

  921.     if (!srcFilter)

  922.         srcFilter = &dummyFilter;

  923. 

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

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

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

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

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

  929. 

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

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

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

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

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

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

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

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

  938. 

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

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

  941. 

  942.     if (isPlanarRGB(dstFormat)) {

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

  944.             av_log(c, AV_LOG_DEBUG,

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

  946.                    av_get_pix_fmt_name(dstFormat));

  947.             flags   |= SWS_FULL_CHR_H_INT;

  948.             c->flags = flags;

  949.         }

  950.     }

  951. 

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

  953.      * chroma interpolation */

  954.     if (flags & SWS_FULL_CHR_H_INT &&

  955.         isAnyRGB(dstFormat)        &&

  956.         !isPlanarRGB(dstFormat)    &&

  957.         dstFormat != AV_PIX_FMT_RGBA  &&

  958.         dstFormat != AV_PIX_FMT_ARGB  &&

  959.         dstFormat != AV_PIX_FMT_BGRA  &&

  960.         dstFormat != AV_PIX_FMT_ABGR  &&

  961.         dstFormat != AV_PIX_FMT_RGB24 &&

  962.         dstFormat != AV_PIX_FMT_BGR24) {

  963.         av_log(c, AV_LOG_ERROR,

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

  965.                sws_format_name(dstFormat));

  966.         flags   &= ~SWS_FULL_CHR_H_INT;

  967.         c->flags = flags;

  968.     }

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

  970.         c->chrDstHSubSample = 1;

  971. 

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

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

  974.                            SWS_SRC_V_CHR_DROP_SHIFT;

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

  976. 

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

  978.      * wants full chroma */

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

  980.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  981.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  982.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  983.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  984.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  985.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

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

  987.          (flags & SWS_FAST_BILINEAR)))

  988.         c->chrSrcHSubSample = 1;

  989. 

  990.     // Note the -((-x)>>y) is so that we always round toward +inf.

  991.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  992.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  993.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  994.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  995. 

  996.     /* unscaled special cases */

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

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

  999.         ff_get_unscaled_swscale(c);

  1000. 

  1001.         if (c->swScale) {

  1002.             if (flags & SWS_PRINT_INFO)

  1003.                 av_log(c, AV_LOG_INFO,

  1004.                        "using unscaled %s -> %s special converter\n",

  1005.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1006.             return 0;

  1007.         }

  1008.     }

  1009. 

  1010.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1011.     if (c->srcBpc < 8)

  1012.         c->srcBpc = 8;

  1013.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1014.     if (c->dstBpc < 8)

  1015.         c->dstBpc = 8;

  1016.     if (c->dstBpc == 16)

  1017.         dst_stride <<= 1;

  1018.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1019.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1020.                      fail);

  1021.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

  1022.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1023.                               (srcW & 15) == 0) ? 1 : 0;

  1024.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1025.             && (flags & SWS_FAST_BILINEAR)) {

  1026.             if (flags & SWS_PRINT_INFO)

  1027.                 av_log(c, AV_LOG_INFO,

  1028.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1029.         }

  1030.         if (usesHFilter)

  1031.             c->canMMXEXTBeUsed = 0;

  1032.     } else

  1033.         c->canMMXEXTBeUsed = 0;

  1034. 

  1035.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1036.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1037. 

  1038.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1039.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1040.      * correct scaling.

  1041.      * n-2 is the last chrominance sample available.

  1042.      * This is not perfect, but no one should notice the difference, the more

  1043.      * correct variant would be like the vertical one, but that would require

  1044.      * some special code for the first and last pixel */

  1045.     if (flags & SWS_FAST_BILINEAR) {

  1046.         if (c->canMMXEXTBeUsed) {

  1047.             c->lumXInc += 20;

  1048.             c->chrXInc += 20;

  1049.         }

  1050.         // we don't use the x86 asm scaler if MMX is available

  1051.         else if (INLINE_MMX(cpu_flags)) {

  1052.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1053.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1054.         }

  1055.     }

  1056. 

  1057. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1058. 

  1059.     /* precalculate horizontal scaler filter coefficients */

  1060.     {

  1061. #if HAVE_MMXEXT_INLINE

  1062. // can't downscale !!!

  1063.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1064.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1065.                                                              NULL, NULL, 8);

  1066.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1067.                                                              NULL, NULL, NULL, 4);

  1068. 

  1069. #if USE_MMAP

  1070.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1071.                                           PROT_READ | PROT_WRITE,

  1072.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1073.                                           -1, 0);

  1074.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1075.                                           PROT_READ | PROT_WRITE,

  1076.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1077.                                           -1, 0);

  1078. #elif HAVE_VIRTUALALLOC

  1079.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1080.                                                   c->lumMmxextFilterCodeSize,

  1081.                                                   MEM_COMMIT,

  1082.                                                   PAGE_EXECUTE_READWRITE);

  1083.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1084.                                                   c->chrMmxextFilterCodeSize,

  1085.                                                   MEM_COMMIT,

  1086.                                                   PAGE_EXECUTE_READWRITE);

  1087. #else

  1088.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1089.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1090. #endif

  1091. 

  1092.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1093.                 return AVERROR(ENOMEM);

  1094.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1095.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1096.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1097.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1098. 

  1099.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1100.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1101.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1102.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1103. 

  1104. #if USE_MMAP

  1105.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1106.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1107. #endif

  1108.         } else

  1109. #endif /* HAVE_MMXEXT_INLINE */

  1110.         {

  1111.             const int filterAlign =

  1112.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1113.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1114.                 1;

  1115. 

  1116.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1117.                            &c->hLumFilterSize, c->lumXInc,

  1118.                            srcW, dstW, filterAlign, 1 << 14,

  1119.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1120.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1121.                            c->param, 1) < 0)

  1122.                 goto fail;

  1123.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1124.                            &c->hChrFilterSize, c->chrXInc,

  1125.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1126.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1127.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1128.                            c->param, 1) < 0)

  1129.                 goto fail;

  1130.         }

  1131.     } // initialize horizontal stuff

  1132. 

  1133.     /* precalculate vertical scaler filter coefficients */

  1134.     {

  1135.         const int filterAlign =

  1136.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1137.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1138.             1;

  1139. 

  1140.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1141.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1142.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1143.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1144.                        c->param, 0) < 0)

  1145.             goto fail;

  1146.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1147.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1148.                        filterAlign, (1 << 12),

  1149.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1150.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1151.                        c->param, 0) < 0)

  1152.             goto fail;

  1153. 

  1154. #if HAVE_ALTIVEC

  1155.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1156.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1157. 

  1158.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1159.             int j;

  1160.             short *p = (short *)&c->vYCoeffsBank[i];

  1161.             for (j = 0; j < 8; j++)

  1162.                 p[j] = c->vLumFilter[i];

  1163.         }

  1164. 

  1165.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1166.             int j;

  1167.             short *p = (short *)&c->vCCoeffsBank[i];

  1168.             for (j = 0; j < 8; j++)

  1169.                 p[j] = c->vChrFilter[i];

  1170.         }

  1171. #endif

  1172.     }

  1173. 

  1174.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1175.     c->vLumBufSize = c->vLumFilterSize;

  1176.     c->vChrBufSize = c->vChrFilterSize;

  1177.     for (i = 0; i < dstH; i++) {

  1178.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1179.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1180.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1181.                                << c->chrSrcVSubSample));

  1182. 

  1183.         nextSlice >>= c->chrSrcVSubSample;

  1184.         nextSlice <<= c->chrSrcVSubSample;

  1185.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1186.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1187.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1188.             (nextSlice >> c->chrSrcVSubSample))

  1189.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1190.                              c->vChrFilterPos[chrI];

  1191.     }

  1192. 

  1193.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1194.      * need to allocate several megabytes to handle all possible cases) */

  1195.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1196.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1197.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1198.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1199.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1200.     /* Note we need at least one pixel more at the end because of the MMX code

  1201.      * (just in case someone wants to replace the 4000/8000). */

  1202.     /* align at 16 bytes for AltiVec */

  1203.     for (i = 0; i < c->vLumBufSize; i++) {

  1204.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1205.                           dst_stride + 16, fail);

  1206.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1207.     }

  1208.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1209.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1210.     c->uv_off_byte = dst_stride + 16;

  1211.     for (i = 0; i < c->vChrBufSize; i++) {

  1212.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1213.                          dst_stride * 2 + 32, fail);

  1214.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1215.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1216.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1217.     }

  1218.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1219.         for (i = 0; i < c->vLumBufSize; i++) {

  1220.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1221.                               dst_stride + 16, fail);

  1222.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1223.         }

  1224. 

  1225.     // try to avoid drawing green stuff between the right end and the stride end

  1226.     for (i = 0; i < c->vChrBufSize; i++)

  1227.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1228. 

  1229.     assert(c->chrDstH <= dstH);

  1230. 

  1231.     if (flags & SWS_PRINT_INFO) {

  1232.         if (flags & SWS_FAST_BILINEAR)

  1233.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1234.         else if (flags & SWS_BILINEAR)

  1235.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1236.         else if (flags & SWS_BICUBIC)

  1237.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1238.         else if (flags & SWS_X)

  1239.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1240.         else if (flags & SWS_POINT)

  1241.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1242.         else if (flags & SWS_AREA)

  1243.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1244.         else if (flags & SWS_BICUBLIN)

  1245.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1246.         else if (flags & SWS_GAUSS)

  1247.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1248.         else if (flags & SWS_SINC)

  1249.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1250.         else if (flags & SWS_LANCZOS)

  1251.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1252.         else if (flags & SWS_SPLINE)

  1253.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1254.         else

  1255.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1256. 

  1257.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1258.                sws_format_name(srcFormat),

  1259. #ifdef DITHER1XBPP

  1260.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1261.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1262.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1263.                                                              "dithered " : "",

  1264. #else

  1265.                "",

  1266. #endif

  1267.                sws_format_name(dstFormat));

  1268. 

  1269.         if (INLINE_MMXEXT(cpu_flags))

  1270.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1271.         else if (INLINE_AMD3DNOW(cpu_flags))

  1272.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1273.         else if (INLINE_MMX(cpu_flags))

  1274.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1275.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1276.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1277.         else

  1278.             av_log(c, AV_LOG_INFO, "using C\n");

  1279. 

  1280.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1281.         av_log(c, AV_LOG_DEBUG,

  1282.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1283.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1284.         av_log(c, AV_LOG_DEBUG,

  1285.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1286.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1287.                c->chrXInc, c->chrYInc);

  1288.     }

  1289. 

  1290.     c->swScale = ff_getSwsFunc(c);

  1291.     return 0;

  1292. fail: // FIXME replace things by appropriate error codes

  1293.     return -1;

  1294. }

  1295. 

  1296. #if FF_API_SWS_GETCONTEXT

  1297. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1298.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1299.                            int flags, SwsFilter *srcFilter,

  1300.                            SwsFilter *dstFilter, const double *param)

  1301. {

  1302.     SwsContext *c;

  1303. 

  1304.     if (!(c = sws_alloc_context()))

  1305.         return NULL;

  1306. 

  1307.     c->flags     = flags;

  1308.     c->srcW      = srcW;

  1309.     c->srcH      = srcH;

  1310.     c->dstW      = dstW;

  1311.     c->dstH      = dstH;

  1312.     c->srcRange  = handle_jpeg(&srcFormat);

  1313.     c->dstRange  = handle_jpeg(&dstFormat);

  1314.     c->srcFormat = srcFormat;

  1315.     c->dstFormat = dstFormat;

  1316. 

  1317.     if (param) {

  1318.         c->param[0] = param[0];

  1319.         c->param[1] = param[1];

  1320.     }

  1321.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1322.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1323.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1324. 

  1325.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1326.         sws_freeContext(c);

  1327.         return NULL;

  1328.     }

  1329. 

  1330.     return c;

  1331. }

  1332. #endif

  1333. 

  1334. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1335.                                 float lumaSharpen, float chromaSharpen,

  1336.                                 float chromaHShift, float chromaVShift,

  1337.                                 int verbose)

  1338. {

  1339.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1340.     if (!filter)

  1341.         return NULL;

  1342. 

  1343.     if (lumaGBlur != 0.0) {

  1344.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1345.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1346.     } else {

  1347.         filter->lumH = sws_getIdentityVec();

  1348.         filter->lumV = sws_getIdentityVec();

  1349.     }

  1350. 

  1351.     if (chromaGBlur != 0.0) {

  1352.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1353.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1354.     } else {

  1355.         filter->chrH = sws_getIdentityVec();

  1356.         filter->chrV = sws_getIdentityVec();

  1357.     }

  1358. 

  1359.     if (chromaSharpen != 0.0) {

  1360.         SwsVector *id = sws_getIdentityVec();

  1361.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1362.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1363.         sws_addVec(filter->chrH, id);

  1364.         sws_addVec(filter->chrV, id);

  1365.         sws_freeVec(id);

  1366.     }

  1367. 

  1368.     if (lumaSharpen != 0.0) {

  1369.         SwsVector *id = sws_getIdentityVec();

  1370.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1371.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1372.         sws_addVec(filter->lumH, id);

  1373.         sws_addVec(filter->lumV, id);

  1374.         sws_freeVec(id);

  1375.     }

  1376. 

  1377.     if (chromaHShift != 0.0)

  1378.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1379. 

  1380.     if (chromaVShift != 0.0)

  1381.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1382. 

  1383.     sws_normalizeVec(filter->chrH, 1.0);

  1384.     sws_normalizeVec(filter->chrV, 1.0);

  1385.     sws_normalizeVec(filter->lumH, 1.0);

  1386.     sws_normalizeVec(filter->lumV, 1.0);

  1387. 

  1388.     if (verbose)

  1389.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1390.     if (verbose)

  1391.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1392. 

  1393.     return filter;

  1394. }

  1395. 

  1396. SwsVector *sws_allocVec(int length)

  1397. {

  1398.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1399.     if (!vec)

  1400.         return NULL;

  1401.     vec->length = length;

  1402.     vec->coeff  = av_malloc(sizeof(double) * length);

  1403.     if (!vec->coeff)

  1404.         av_freep(&vec);

  1405.     return vec;

  1406. }

  1407. 

  1408. SwsVector *sws_getGaussianVec(double variance, double quality)

  1409. {

  1410.     const int length = (int)(variance * quality + 0.5) | 1;

  1411.     int i;

  1412.     double middle  = (length - 1) * 0.5;

  1413.     SwsVector *vec = sws_allocVec(length);

  1414. 

  1415.     if (!vec)

  1416.         return NULL;

  1417. 

  1418.     for (i = 0; i < length; i++) {

  1419.         double dist = i - middle;

  1420.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1421.                         sqrt(2 * variance * M_PI);

  1422.     }

  1423. 

  1424.     sws_normalizeVec(vec, 1.0);

  1425. 

  1426.     return vec;

  1427. }

  1428. 

  1429. SwsVector *sws_getConstVec(double c, int length)

  1430. {

  1431.     int i;

  1432.     SwsVector *vec = sws_allocVec(length);

  1433. 

  1434.     if (!vec)

  1435.         return NULL;

  1436. 

  1437.     for (i = 0; i < length; i++)

  1438.         vec->coeff[i] = c;

  1439. 

  1440.     return vec;

  1441. }

  1442. 

  1443. SwsVector *sws_getIdentityVec(void)

  1444. {

  1445.     return sws_getConstVec(1.0, 1);

  1446. }

  1447. 

  1448. static double sws_dcVec(SwsVector *a)

  1449. {

  1450.     int i;

  1451.     double sum = 0;

  1452. 

  1453.     for (i = 0; i < a->length; i++)

  1454.         sum += a->coeff[i];

  1455. 

  1456.     return sum;

  1457. }

  1458. 

  1459. void sws_scaleVec(SwsVector *a, double scalar)

  1460. {

  1461.     int i;

  1462. 

  1463.     for (i = 0; i < a->length; i++)

  1464.         a->coeff[i] *= scalar;

  1465. }

  1466. 

  1467. void sws_normalizeVec(SwsVector *a, double height)

  1468. {

  1469.     sws_scaleVec(a, height / sws_dcVec(a));

  1470. }

  1471. 

  1472. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1473. {

  1474.     int length = a->length + b->length - 1;

  1475.     int i, j;

  1476.     SwsVector *vec = sws_getConstVec(0.0, length);

  1477. 

  1478.     if (!vec)

  1479.         return NULL;

  1480. 

  1481.     for (i = 0; i < a->length; i++) {

  1482.         for (j = 0; j < b->length; j++) {

  1483.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1484.         }

  1485.     }

  1486. 

  1487.     return vec;

  1488. }

  1489. 

  1490. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1491. {

  1492.     int length = FFMAX(a->length, b->length);

  1493.     int i;

  1494.     SwsVector *vec = sws_getConstVec(0.0, length);

  1495. 

  1496.     if (!vec)

  1497.         return NULL;

  1498. 

  1499.     for (i = 0; i < a->length; i++)

  1500.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1501.     for (i = 0; i < b->length; i++)

  1502.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1503. 

  1504.     return vec;

  1505. }

  1506. 

  1507. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1508. {

  1509.     int length = FFMAX(a->length, b->length);

  1510.     int i;

  1511.     SwsVector *vec = sws_getConstVec(0.0, length);

  1512. 

  1513.     if (!vec)

  1514.         return NULL;

  1515. 

  1516.     for (i = 0; i < a->length; i++)

  1517.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1518.     for (i = 0; i < b->length; i++)

  1519.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1520. 

  1521.     return vec;

  1522. }

  1523. 

  1524. /* shift left / or right if "shift" is negative */

  1525. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1526. {

  1527.     int length = a->length + FFABS(shift) * 2;

  1528.     int i;

  1529.     SwsVector *vec = sws_getConstVec(0.0, length);

  1530. 

  1531.     if (!vec)

  1532.         return NULL;

  1533. 

  1534.     for (i = 0; i < a->length; i++) {

  1535.         vec->coeff[i + (length    - 1) / 2 -

  1536.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1537.     }

  1538. 

  1539.     return vec;

  1540. }

  1541. 

  1542. void sws_shiftVec(SwsVector *a, int shift)

  1543. {

  1544.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1545.     av_free(a->coeff);

  1546.     a->coeff  = shifted->coeff;

  1547.     a->length = shifted->length;

  1548.     av_free(shifted);

  1549. }

  1550. 

  1551. void sws_addVec(SwsVector *a, SwsVector *b)

  1552. {

  1553.     SwsVector *sum = sws_sumVec(a, b);

  1554.     av_free(a->coeff);

  1555.     a->coeff  = sum->coeff;

  1556.     a->length = sum->length;

  1557.     av_free(sum);

  1558. }

  1559. 

  1560. void sws_subVec(SwsVector *a, SwsVector *b)

  1561. {

  1562.     SwsVector *diff = sws_diffVec(a, b);

  1563.     av_free(a->coeff);

  1564.     a->coeff  = diff->coeff;

  1565.     a->length = diff->length;

  1566.     av_free(diff);

  1567. }

  1568. 

  1569. void sws_convVec(SwsVector *a, SwsVector *b)

  1570. {

  1571.     SwsVector *conv = sws_getConvVec(a, b);

  1572.     av_free(a->coeff);

  1573.     a->coeff  = conv->coeff;

  1574.     a->length = conv->length;

  1575.     av_free(conv);

  1576. }

  1577. 

  1578. SwsVector *sws_cloneVec(SwsVector *a)

  1579. {

  1580.     int i;

  1581.     SwsVector *vec = sws_allocVec(a->length);

  1582. 

  1583.     if (!vec)

  1584.         return NULL;

  1585. 

  1586.     for (i = 0; i < a->length; i++)

  1587.         vec->coeff[i] = a->coeff[i];

  1588. 

  1589.     return vec;

  1590. }

  1591. 

  1592. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1593. {

  1594.     int i;

  1595.     double max = 0;

  1596.     double min = 0;

  1597.     double range;

  1598. 

  1599.     for (i = 0; i < a->length; i++)

  1600.         if (a->coeff[i] > max)

  1601.             max = a->coeff[i];

  1602. 

  1603.     for (i = 0; i < a->length; i++)

  1604.         if (a->coeff[i] < min)

  1605.             min = a->coeff[i];

  1606. 

  1607.     range = max - min;

  1608. 

  1609.     for (i = 0; i < a->length; i++) {

  1610.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1611.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1612.         for (; x > 0; x--)

  1613.             av_log(log_ctx, log_level, " ");

  1614.         av_log(log_ctx, log_level, "|\n");

  1615.     }

  1616. }

  1617. 

  1618. void sws_freeVec(SwsVector *a)

  1619. {

  1620.     if (!a)

  1621.         return;

  1622.     av_freep(&a->coeff);

  1623.     a->length = 0;

  1624.     av_free(a);

  1625. }

  1626. 

  1627. void sws_freeFilter(SwsFilter *filter)

  1628. {

  1629.     if (!filter)

  1630.         return;

  1631. 

  1632.     if (filter->lumH)

  1633.         sws_freeVec(filter->lumH);

  1634.     if (filter->lumV)

  1635.         sws_freeVec(filter->lumV);

  1636.     if (filter->chrH)

  1637.         sws_freeVec(filter->chrH);

  1638.     if (filter->chrV)

  1639.         sws_freeVec(filter->chrV);

  1640.     av_free(filter);

  1641. }

  1642. 

  1643. void sws_freeContext(SwsContext *c)

  1644. {

  1645.     int i;

  1646.     if (!c)

  1647.         return;

  1648. 

  1649.     if (c->lumPixBuf) {

  1650.         for (i = 0; i < c->vLumBufSize; i++)

  1651.             av_freep(&c->lumPixBuf[i]);

  1652.         av_freep(&c->lumPixBuf);

  1653.     }

  1654. 

  1655.     if (c->chrUPixBuf) {

  1656.         for (i = 0; i < c->vChrBufSize; i++)

  1657.             av_freep(&c->chrUPixBuf[i]);

  1658.         av_freep(&c->chrUPixBuf);

  1659.         av_freep(&c->chrVPixBuf);

  1660.     }

  1661. 

  1662.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1663.         for (i = 0; i < c->vLumBufSize; i++)

  1664.             av_freep(&c->alpPixBuf[i]);

  1665.         av_freep(&c->alpPixBuf);

  1666.     }

  1667. 

  1668.     av_freep(&c->vLumFilter);

  1669.     av_freep(&c->vChrFilter);

  1670.     av_freep(&c->hLumFilter);

  1671.     av_freep(&c->hChrFilter);

  1672. #if HAVE_ALTIVEC

  1673.     av_freep(&c->vYCoeffsBank);

  1674.     av_freep(&c->vCCoeffsBank);

  1675. #endif

  1676. 

  1677.     av_freep(&c->vLumFilterPos);

  1678.     av_freep(&c->vChrFilterPos);

  1679.     av_freep(&c->hLumFilterPos);

  1680.     av_freep(&c->hChrFilterPos);

  1681. 

  1682. #if HAVE_MMX_INLINE

  1683. #if USE_MMAP

  1684.     if (c->lumMmxextFilterCode)

  1685.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1686.     if (c->chrMmxextFilterCode)

  1687.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1688. #elif HAVE_VIRTUALALLOC

  1689.     if (c->lumMmxextFilterCode)

  1690.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1691.     if (c->chrMmxextFilterCode)

  1692.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1693. #else

  1694.     av_free(c->lumMmxextFilterCode);

  1695.     av_free(c->chrMmxextFilterCode);

  1696. #endif

  1697.     c->lumMmxextFilterCode = NULL;

  1698.     c->chrMmxextFilterCode = NULL;

  1699. #endif /* HAVE_MMX_INLINE */

  1700. 

  1701.     av_freep(&c->yuvTable);

  1702.     av_free(c->formatConvBuffer);

  1703. 

  1704.     av_free(c);

  1705. }

  1706. 

  1707. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1708.                                         int srcH, enum AVPixelFormat srcFormat,

  1709.                                         int dstW, int dstH,

  1710.                                         enum AVPixelFormat dstFormat, int flags,

  1711.                                         SwsFilter *srcFilter,

  1712.                                         SwsFilter *dstFilter,

  1713.                                         const double *param)

  1714. {

  1715.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1716.                                              SWS_PARAM_DEFAULT };

  1717. 

  1718.     if (!param)

  1719.         param = default_param;

  1720. 

  1721.     if (context &&

  1722.         (context->srcW      != srcW      ||

  1723.          context->srcH      != srcH      ||

  1724.          context->srcFormat != srcFormat ||

  1725.          context->dstW      != dstW      ||

  1726.          context->dstH      != dstH      ||

  1727.          context->dstFormat != dstFormat ||

  1728.          context->flags     != flags     ||

  1729.          context->param[0]  != param[0]  ||

  1730.          context->param[1]  != param[1])) {

  1731.         sws_freeContext(context);

  1732.         context = NULL;

  1733.     }

  1734. 

  1735.     if (!context) {

  1736.         if (!(context = sws_alloc_context()))

  1737.             return NULL;

  1738.         context->srcW      = srcW;

  1739.         context->srcH      = srcH;

  1740.         context->srcRange  = handle_jpeg(&srcFormat);

  1741.         context->srcFormat = srcFormat;

  1742.         context->dstW      = dstW;

  1743.         context->dstH      = dstH;

  1744.         context->dstRange  = handle_jpeg(&dstFormat);

  1745.         context->dstFormat = dstFormat;

  1746.         context->flags     = flags;

  1747.         context->param[0]  = param[0];

  1748.         context->param[1]  = param[1];

  1749.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1750.                                  context->srcRange,

  1751.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1752.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1753.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1754.             sws_freeContext(context);

  1755.             return NULL;

  1756.         }

  1757.     }

  1758.     return context;

  1759. }