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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/ppc/cpu.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.     return LIBSWSCALE_VERSION_INT;

  58. }

  59. 

  60. const char *swscale_configuration(void)

  61. {

  62.     return LIBAV_CONFIGURATION;

  63. }

  64. 

  65. const char *swscale_license(void)

  66. {

  67. #define LICENSE_PREFIX "libswscale license: "

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

  69. }

  70. 

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

  72. 

  73. typedef struct FormatEntry {

  74.     uint8_t is_supported_in         :1;

  75.     uint8_t is_supported_out        :1;

  76.     uint8_t is_supported_endianness :1;

  77. } FormatEntry;

  78. 

  79. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  95.     [AV_PIX_FMT_YVYU422]     = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  157.     [AV_PIX_FMT_YA8]         = { 1, 0 },

  158.     [AV_PIX_FMT_YA16BE]      = { 1, 0 },

  159.     [AV_PIX_FMT_YA16LE]      = { 1, 0 },

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

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

  162.     [AV_PIX_FMT_BGRA64BE]    = { 0, 0, 1 },

  163.     [AV_PIX_FMT_BGRA64LE]    = { 0, 0, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  194. };

  195. 

  196. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  197. {

  198.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  199.            format_entries[pix_fmt].is_supported_in : 0;

  200. }

  201. 

  202. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  203. {

  204.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  205.            format_entries[pix_fmt].is_supported_out : 0;

  206. }

  207. 

  208. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  209. {

  210.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  211.            format_entries[pix_fmt].is_supported_endianness : 0;

  212. }

  213. 

  214. const char *sws_format_name(enum AVPixelFormat format)

  215. {

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

  217.     if (desc)

  218.         return desc->name;

  219.     else

  220.         return "Unknown format";

  221. }

  222. 

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

  224.                              double dist)

  225. {

  226.     if (dist <= 1.0)

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

  228.     else

  229.         return getSplineCoeff(0.0,

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

  231.                                c + 3.0 * d,

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

  233.                               dist - 1.0);

  234. }

  235. 

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

  237.                               int *outFilterSize, int xInc, int srcW,

  238.                               int dstW, int filterAlign, int one,

  239.                               int flags, int cpu_flags,

  240.                               SwsVector *srcFilter, SwsVector *dstFilter,

  241.                               double param[2], int is_horizontal)

  242. {

  243.     int i;

  244.     int filterSize;

  245.     int filter2Size;

  246.     int minFilterSize;

  247.     int64_t *filter    = NULL;

  248.     int64_t *filter2   = NULL;

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

  250.     int ret            = -1;

  251. 

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

  253. 

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

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

  256. 

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

  258.         int i;

  259.         filterSize = 1;

  260.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  262. 

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

  264.             filter[i * filterSize] = fone;

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

  266.         }

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

  268.         int i;

  269.         int xDstInSrc;

  270.         filterSize = 1;

  271.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  273. 

  274.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  277. 

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

  279.             filter[i]       = fone;

  280.             xDstInSrc      += xInc;

  281.         }

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

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

  284.         int i;

  285.         int xDstInSrc;

  286.         filterSize = 2;

  287.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  289. 

  290.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  293.             int j;

  294. 

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

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

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

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

  299.                                 (fone >> 16);

  300.                 if (coeff < 0)

  301.                     coeff = 0;

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

  303.                 xx++;

  304.             }

  305.             xDstInSrc += xInc;

  306.         }

  307.     } else {

  308.         int64_t xDstInSrc;

  309.         int sizeFactor;

  310. 

  311.         if (flags & SWS_BICUBIC)

  312.             sizeFactor = 4;

  313.         else if (flags & SWS_X)

  314.             sizeFactor = 8;

  315.         else if (flags & SWS_AREA)

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

  317.         else if (flags & SWS_GAUSS)

  318.             sizeFactor = 8;     // infinite ;)

  319.         else if (flags & SWS_LANCZOS)

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

  321.         else if (flags & SWS_SINC)

  322.             sizeFactor = 20;    // infinite ;)

  323.         else if (flags & SWS_SPLINE)

  324.             sizeFactor = 20;    // infinite ;)

  325.         else if (flags & SWS_BILINEAR)

  326.             sizeFactor = 2;

  327.         else {

  328.             sizeFactor = 0;     // GCC warning killer

  329.             assert(0);

  330.         }

  331. 

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

  333.             filterSize = 1 + sizeFactor;    // upscale

  334.         else

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

  336. 

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

  338.         filterSize = FFMAX(filterSize, 1);

  339. 

  340.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  342. 

  343.         xDstInSrc = xInc - 0x10000;

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

  345.             int xx = (xDstInSrc - ((int64_t)(filterSize - 2) << 16)) / (1 << 17);

  346.             int j;

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

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

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

  350.                 double floatd;

  351.                 int64_t coeff;

  352. 

  353.                 if (xInc > 1 << 16)

  354.                     d = d * dstW / srcW;

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

  356. 

  357.                 if (flags & SWS_BICUBIC) {

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

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

  360. 

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

  362.                         coeff = 0.0;

  363.                     } else {

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

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

  366. 

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

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

  369.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  370.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  371.                         else

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

  373.                                       (6 * B + 30 * C) * dd  +

  374.                                     (-12 * B - 48 * C) * d   +

  375.                                       (8 * B + 24 * C) * (1 << 30);

  376.                     }

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

  378.                 }

  379.                 else if (flags & SWS_X) {

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

  381.                     double c;

  382. 

  383.                     if (floatd < 1.0)

  384.                         c = cos(floatd * M_PI);

  385.                     else

  386.                         c = -1.0;

  387.                     if (c < 0.0)

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

  389.                     else

  390.                         c = pow(c, A);

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

  392.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  398.                     else

  399.                         coeff = 0.0;

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

  401.                 } else if (flags & SWS_GAUSS) {

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

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

  404.                 } else if (flags & SWS_SINC) {

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

  406.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  410.                     if (floatd > p)

  411.                         coeff = 0;

  412.                 } else if (flags & SWS_BILINEAR) {

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

  414.                     if (coeff < 0)

  415.                         coeff = 0;

  416.                     coeff *= fone >> 30;

  417.                 } else if (flags & SWS_SPLINE) {

  418.                     double p = -2.196152422706632;

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

  420.                 } else {

  421.                     coeff = 0.0; // GCC warning killer

  422.                     assert(0);

  423.                 }

  424. 

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

  426.                 xx++;

  427.             }

  428.             xDstInSrc += 2 * xInc;

  429.         }

  430.     }

  431. 

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

  433.      * av_free(filter);

  434.      */

  435.     assert(filterSize > 0);

  436.     filter2Size = filterSize;

  437.     if (srcFilter)

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

  439.     if (dstFilter)

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

  441.     assert(filter2Size > 0);

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

  443. 

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

  445.         int j, k;

  446. 

  447.         if (srcFilter) {

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

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

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

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

  452.             }

  453.         } else {

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

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

  456.         }

  457.         // FIXME dstFilter

  458. 

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

  460.     }

  461.     av_freep(&filter);

  462. 

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

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

  465.     minFilterSize = 0;

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

  467.         int min = filter2Size;

  468.         int j;

  469.         int64_t cutOff = 0.0;

  470. 

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

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

  473.             int k;

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

  475. 

  476.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  477.                 break;

  478. 

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

  480.              * filter otherwise */

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

  482.                 break;

  483. 

  484.             // move filter coefficients left

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

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

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

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

  489.         }

  490. 

  491.         cutOff = 0;

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

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

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

  495. 

  496.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  497.                 break;

  498.             min--;

  499.         }

  500. 

  501.         if (min > minFilterSize)

  502.             minFilterSize = min;

  503.     }

  504. 

  505.     if (PPC_ALTIVEC(cpu_flags)) {

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

  507.         if (minFilterSize < 5)

  508.             filterAlign = 4;

  509. 

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

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

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

  513.         if (minFilterSize < 3)

  514.             filterAlign = 1;

  515.     }

  516. 

  517.     if (INLINE_MMX(cpu_flags)) {

  518.         // special case for unscaled vertical filtering

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

  520.             filterAlign = 1;

  521.     }

  522. 

  523.     assert(minFilterSize > 0);

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

  525.     assert(filterSize > 0);

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

  527.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  529.         goto fail;

  530.     *outFilterSize = filterSize;

  531. 

  532.     if (flags & SWS_PRINT_INFO)

  533.         av_log(NULL, AV_LOG_VERBOSE,

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

  535.                filter2Size, filterSize);

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

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

  538.         int j;

  539. 

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

  541.             if (j >= filter2Size)

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

  543.             else

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

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

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

  547.         }

  548.     }

  549. 

  550.     // FIXME try to align filterPos if possible

  551. 

  552.     // fix borders

  553.     if (is_horizontal) {

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

  555.             int j;

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

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

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

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

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

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

  562.                 }

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

  564.             }

  565. 

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

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

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

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

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

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

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

  573.                 }

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

  575.             }

  576.         }

  577.     }

  578. 

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

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

  581.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  583. 

  584.     /* normalize & store in outFilter */

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

  586.         int j;

  587.         int64_t error = 0;

  588.         int64_t sum   = 0;

  589. 

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

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

  592.         }

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

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

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

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

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

  598.             error                                  = v - intV * sum;

  599.         }

  600.     }

  601. 

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

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

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

  605.                                                       * read over the end */

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

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

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

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

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

  611.     }

  612. 

  613.     ret = 0;

  614. 

  615. fail:

  616.     av_free(filter);

  617.     av_free(filter2);

  618.     return ret;

  619. }

  620. 

  621. #if HAVE_MMXEXT_INLINE

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

  623.                                        int16_t *filter, int32_t *filterPos,

  624.                                        int numSplits)

  625. {

  626.     uint8_t *fragmentA;

  627.     x86_reg imm8OfPShufW1A;

  628.     x86_reg imm8OfPShufW2A;

  629.     x86_reg fragmentLengthA;

  630.     uint8_t *fragmentB;

  631.     x86_reg imm8OfPShufW1B;

  632.     x86_reg imm8OfPShufW2B;

  633.     x86_reg fragmentLengthB;

  634.     int fragmentPos;

  635. 

  636.     int xpos, i;

  637. 

  638.     // create an optimized horizontal scaling routine

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

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

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

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

  643.      */

  644. 

  645.     // code fragment

  646. 

  647.     __asm__ volatile (

  648.         "jmp                         9f                 \n\t"

  649.         // Begin

  650.         "0:                                             \n\t"

  651.         "movq  (%%"FF_REG_d", %%"FF_REG_a"), %%mm3      \n\t"

  652.         "movd  (%%"FF_REG_c", %%"FF_REG_S"), %%mm0      \n\t"

  653.         "movd 1(%%"FF_REG_c", %%"FF_REG_S"), %%mm1      \n\t"

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

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

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

  657.         "1:                                             \n\t"

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

  659.         "2:                                             \n\t"

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

  661.         "movl 8(%%"FF_REG_b", %%"FF_REG_a"), %%esi      \n\t"

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

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

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

  665. 

  666.         "movq       %%mm0, (%%"FF_REG_D", %%"FF_REG_a") \n\t"

  667. 

  668.         "add                         $8, %%"FF_REG_a"   \n\t"

  669.         // End

  670.         "9:                                             \n\t"

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

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

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

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

  675.         "dec                         %1                 \n\t"

  676.         "dec                         %2                 \n\t"

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

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

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

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

  681. 

  682. 

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

  684.           "=r" (fragmentLengthA)

  685.         );

  686. 

  687.     __asm__ volatile (

  688.         "jmp                         9f                 \n\t"

  689.         // Begin

  690.         "0:                                             \n\t"

  691.         "movq (%%"FF_REG_d", %%"FF_REG_a"), %%mm3       \n\t"

  692.         "movd (%%"FF_REG_c", %%"FF_REG_S"), %%mm0       \n\t"

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

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

  695.         "1:                                             \n\t"

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

  697.         "2:                                             \n\t"

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

  699.         "movl 8(%%"FF_REG_b", %%"FF_REG_a"), %%esi      \n\t"

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

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

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

  703. 

  704.         "movq       %%mm0, (%%"FF_REG_D", %%"FF_REG_a") \n\t"

  705. 

  706.         "add                      $8, %%"FF_REG_a"      \n\t"

  707.         // End

  708.         "9:                                             \n\t"

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

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

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

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

  713.         "dec                         %1                 \n\t"

  714.         "dec                         %2                 \n\t"

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

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

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

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

  719. 

  720. 

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

  722.           "=r" (fragmentLengthB)

  723.         );

  724. 

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

  726.     fragmentPos = 0;

  727. 

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

  729.         int xx = xpos >> 16;

  730. 

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

  732.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  742.             int shift              = 0;

  743. 

  744.             if (filterCode) {

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

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

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

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

  749.                 filterPos[i / 2] = xx;

  750. 

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

  752. 

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

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

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

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

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

  758.                                                                (c << 4) |

  759.                                                                (d << 6);

  760. 

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

  762.                     shift = maxShift;               // avoid overread

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

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

  765. 

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

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

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

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

  770.                 }

  771.             }

  772. 

  773.             fragmentPos += fragmentLength;

  774. 

  775.             if (filterCode)

  776.                 filterCode[fragmentPos] = RET;

  777.         }

  778.         xpos += xInc;

  779.     }

  780.     if (filterCode)

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

  782. 

  783.     return fragmentPos + 1;

  784. }

  785. #endif /* HAVE_MMXEXT_INLINE */

  786. 

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

  788. {

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

  790.     *h = desc->log2_chroma_w;

  791.     *v = desc->log2_chroma_h;

  792. }

  793. 

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

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

  796.                              int brightness, int contrast, int saturation)

  797. {

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

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

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

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

  802. 

  803.     c->brightness = brightness;

  804.     c->contrast   = contrast;

  805.     c->saturation = saturation;

  806.     c->srcRange   = srcRange;

  807.     c->dstRange   = dstRange;

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

  809.         return -1;

  810. 

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

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

  813. 

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

  815.                              contrast, saturation);

  816.     // FIXME factorize

  817. 

  818.     if (ARCH_PPC)

  819.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  820.                                    contrast, saturation);

  821.     return 0;

  822. }

  823. 

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

  825.                              int *srcRange, int **table, int *dstRange,

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

  827. {

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

  829.         return -1;

  830. 

  831.     *inv_table  = c->srcColorspaceTable;

  832.     *table      = c->dstColorspaceTable;

  833.     *srcRange   = c->srcRange;

  834.     *dstRange   = c->dstRange;

  835.     *brightness = c->brightness;

  836.     *contrast   = c->contrast;

  837.     *saturation = c->saturation;

  838. 

  839.     return 0;

  840. }

  841. 

  842. static int handle_jpeg(enum AVPixelFormat *format)

  843. {

  844.     switch (*format) {

  845.     case AV_PIX_FMT_YUVJ420P:

  846.         *format = AV_PIX_FMT_YUV420P;

  847.         return 1;

  848.     case AV_PIX_FMT_YUVJ422P:

  849.         *format = AV_PIX_FMT_YUV422P;

  850.         return 1;

  851.     case AV_PIX_FMT_YUVJ444P:

  852.         *format = AV_PIX_FMT_YUV444P;

  853.         return 1;

  854.     case AV_PIX_FMT_YUVJ440P:

  855.         *format = AV_PIX_FMT_YUV440P;

  856.         return 1;

  857.     default:

  858.         return 0;

  859.     }

  860. }

  861. 

  862. SwsContext *sws_alloc_context(void)

  863. {

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

  865. 

  866.     if (c) {

  867.         c->av_class = &ff_sws_context_class;

  868.         av_opt_set_defaults(c);

  869.     }

  870. 

  871.     return c;

  872. }

  873. 

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

  875.                              SwsFilter *dstFilter)

  876. {

  877.     int i;

  878.     int usesVFilter, usesHFilter;

  879.     int unscaled;

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

  881.     int srcW              = c->srcW;

  882.     int srcH              = c->srcH;

  883.     int dstW              = c->dstW;

  884.     int dstH              = c->dstH;

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

  886.     int dst_stride_px     = dst_stride >> 1;

  887.     int flags, cpu_flags;

  888.     enum AVPixelFormat srcFormat = c->srcFormat;

  889.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  892. 

  893.     cpu_flags = av_get_cpu_flags();

  894.     flags     = c->flags;

  895.     emms_c();

  896.     if (!rgb15to16)

  897.         ff_rgb2rgb_init();

  898. 

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

  900. 

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

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

  903.     if (!sws_isSupportedInput(srcFormat)) {

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

  905.                sws_format_name(srcFormat));

  906.         return AVERROR(EINVAL);

  907.     }

  908.     if (!sws_isSupportedOutput(dstFormat)) {

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

  910.                sws_format_name(dstFormat));

  911.         return AVERROR(EINVAL);

  912.     }

  913.     }

  914. 

  915.     i = flags & (SWS_POINT         |

  916.                  SWS_AREA          |

  917.                  SWS_BILINEAR      |

  918.                  SWS_FAST_BILINEAR |

  919.                  SWS_BICUBIC       |

  920.                  SWS_X             |

  921.                  SWS_GAUSS         |

  922.                  SWS_LANCZOS       |

  923.                  SWS_SINC          |

  924.                  SWS_SPLINE        |

  925.                  SWS_BICUBLIN);

  926. 

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

  928.     if (!i) {

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

  930.             flags |= SWS_GAUSS;

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

  932.             flags |= SWS_SINC;

  933.         else

  934.             flags |= SWS_LANCZOS;

  935.         c->flags = flags;

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

  937.         av_log(c, AV_LOG_ERROR,

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

  939.         return AVERROR(EINVAL);

  940.     }

  941.     /* sanity check */

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

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

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

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

  946.                srcW, srcH, dstW, dstH);

  947.         return AVERROR(EINVAL);

  948.     }

  949. 

  950.     if (!dstFilter)

  951.         dstFilter = &dummyFilter;

  952.     if (!srcFilter)

  953.         srcFilter = &dummyFilter;

  954. 

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

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

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

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

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

  960. 

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

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

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

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

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

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

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

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

  969. 

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

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

  972. 

  973.     if (isPlanarRGB(dstFormat)) {

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

  975.             av_log(c, AV_LOG_DEBUG,

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

  977.                    av_get_pix_fmt_name(dstFormat));

  978.             flags   |= SWS_FULL_CHR_H_INT;

  979.             c->flags = flags;

  980.         }

  981.     }

  982. 

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

  984.      * chroma interpolation */

  985.     if (flags & SWS_FULL_CHR_H_INT &&

  986.         isAnyRGB(dstFormat)        &&

  987.         !isPlanarRGB(dstFormat)    &&

  988.         dstFormat != AV_PIX_FMT_RGBA  &&

  989.         dstFormat != AV_PIX_FMT_ARGB  &&

  990.         dstFormat != AV_PIX_FMT_BGRA  &&

  991.         dstFormat != AV_PIX_FMT_ABGR  &&

  992.         dstFormat != AV_PIX_FMT_RGB24 &&

  993.         dstFormat != AV_PIX_FMT_BGR24) {

  994.         av_log(c, AV_LOG_ERROR,

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

  996.                sws_format_name(dstFormat));

  997.         flags   &= ~SWS_FULL_CHR_H_INT;

  998.         c->flags = flags;

  999.     }

  1000.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1001.         c->chrDstHSubSample = 1;

  1002. 

  1003.     // drop some chroma lines if the user wants it

  1004.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1005.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1006.     c->chrSrcVSubSample += c->vChrDrop;

  1007. 

  1008.     /* drop every other pixel for chroma calculation unless user

  1009.      * wants full chroma */

  1010.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1011.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1012.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1013.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1014.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1015.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1016.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1017.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1018.          (flags & SWS_FAST_BILINEAR)))

  1019.         c->chrSrcHSubSample = 1;

  1020. 

  1021.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1022.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1023.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1024.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1025.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1026. 

  1027.     /* unscaled special cases */

  1028.     if (unscaled && !usesHFilter && !usesVFilter &&

  1029.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1030.         ff_get_unscaled_swscale(c);

  1031. 

  1032.         if (c->swscale) {

  1033.             if (flags & SWS_PRINT_INFO)

  1034.                 av_log(c, AV_LOG_INFO,

  1035.                        "using unscaled %s -> %s special converter\n",

  1036.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1037.             return 0;

  1038.         }

  1039.     }

  1040. 

  1041.     c->srcBpc = desc_src->comp[0].depth;

  1042.     if (c->srcBpc < 8)

  1043.         c->srcBpc = 8;

  1044.     c->dstBpc = desc_dst->comp[0].depth;

  1045.     if (c->dstBpc < 8)

  1046.         c->dstBpc = 8;

  1047.     if (c->dstBpc == 16)

  1048.         dst_stride <<= 1;

  1049.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1050.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1051.                      fail);

  1052.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

  1053.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1054.                               (srcW & 15) == 0) ? 1 : 0;

  1055.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1056.             && (flags & SWS_FAST_BILINEAR)) {

  1057.             if (flags & SWS_PRINT_INFO)

  1058.                 av_log(c, AV_LOG_INFO,

  1059.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1060.         }

  1061.         if (usesHFilter)

  1062.             c->canMMXEXTBeUsed = 0;

  1063.     } else

  1064.         c->canMMXEXTBeUsed = 0;

  1065. 

  1066.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1067.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1068. 

  1069.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1070.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1071.      * correct scaling.

  1072.      * n-2 is the last chrominance sample available.

  1073.      * This is not perfect, but no one should notice the difference, the more

  1074.      * correct variant would be like the vertical one, but that would require

  1075.      * some special code for the first and last pixel */

  1076.     if (flags & SWS_FAST_BILINEAR) {

  1077.         if (c->canMMXEXTBeUsed) {

  1078.             c->lumXInc += 20;

  1079.             c->chrXInc += 20;

  1080.         }

  1081.         // we don't use the x86 asm scaler if MMX is available

  1082.         else if (INLINE_MMX(cpu_flags)) {

  1083.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1084.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1085.         }

  1086.     }

  1087. 

  1088. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1089. 

  1090.     /* precalculate horizontal scaler filter coefficients */

  1091.     {

  1092. #if HAVE_MMXEXT_INLINE

  1093. // can't downscale !!!

  1094.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1095.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1096.                                                              NULL, NULL, 8);

  1097.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1098.                                                              NULL, NULL, NULL, 4);

  1099. 

  1100. #if USE_MMAP

  1101.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1102.                                           PROT_READ | PROT_WRITE,

  1103.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1104.                                           -1, 0);

  1105.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1106.                                           PROT_READ | PROT_WRITE,

  1107.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1108.                                           -1, 0);

  1109. #elif HAVE_VIRTUALALLOC

  1110.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1111.                                                   c->lumMmxextFilterCodeSize,

  1112.                                                   MEM_COMMIT,

  1113.                                                   PAGE_EXECUTE_READWRITE);

  1114.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1115.                                                   c->chrMmxextFilterCodeSize,

  1116.                                                   MEM_COMMIT,

  1117.                                                   PAGE_EXECUTE_READWRITE);

  1118. #else

  1119.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1120.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1121. #endif

  1122. 

  1123.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1124.                 return AVERROR(ENOMEM);

  1125.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1126.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1127.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1128.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1129. 

  1130.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1131.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1132.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1133.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1134. 

  1135. #if USE_MMAP

  1136.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1137.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1138. #endif

  1139.         } else

  1140. #endif /* HAVE_MMXEXT_INLINE */

  1141.         {

  1142.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1143.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1144. 

  1145.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1146.                            &c->hLumFilterSize, c->lumXInc,

  1147.                            srcW, dstW, filterAlign, 1 << 14,

  1148.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1149.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1150.                            c->param, 1) < 0)

  1151.                 goto fail;

  1152.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1153.                            &c->hChrFilterSize, c->chrXInc,

  1154.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1155.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1156.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1157.                            c->param, 1) < 0)

  1158.                 goto fail;

  1159.         }

  1160.     } // initialize horizontal stuff

  1161. 

  1162.     /* precalculate vertical scaler filter coefficients */

  1163.     {

  1164.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1165.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1166. 

  1167.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1168.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1169.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1170.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1171.                        c->param, 0) < 0)

  1172.             goto fail;

  1173.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1174.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1175.                        filterAlign, (1 << 12),

  1176.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1177.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1178.                        c->param, 0) < 0)

  1179.             goto fail;

  1180. 

  1181. #if HAVE_ALTIVEC

  1182.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1183.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1184. 

  1185.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1186.             int j;

  1187.             short *p = (short *)&c->vYCoeffsBank[i];

  1188.             for (j = 0; j < 8; j++)

  1189.                 p[j] = c->vLumFilter[i];

  1190.         }

  1191. 

  1192.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1193.             int j;

  1194.             short *p = (short *)&c->vCCoeffsBank[i];

  1195.             for (j = 0; j < 8; j++)

  1196.                 p[j] = c->vChrFilter[i];

  1197.         }

  1198. #endif

  1199.     }

  1200. 

  1201.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1202.     c->vLumBufSize = c->vLumFilterSize;

  1203.     c->vChrBufSize = c->vChrFilterSize;

  1204.     for (i = 0; i < dstH; i++) {

  1205.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1206.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1207.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1208.                                << c->chrSrcVSubSample));

  1209. 

  1210.         nextSlice >>= c->chrSrcVSubSample;

  1211.         nextSlice <<= c->chrSrcVSubSample;

  1212.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1213.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1214.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1215.             (nextSlice >> c->chrSrcVSubSample))

  1216.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1217.                              c->vChrFilterPos[chrI];

  1218.     }

  1219. 

  1220.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1221.      * need to allocate several megabytes to handle all possible cases) */

  1222.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1223.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1224.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1225.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1226.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1227.     /* Note we need at least one pixel more at the end because of the MMX code

  1228.      * (just in case someone wants to replace the 4000/8000). */

  1229.     /* align at 16 bytes for AltiVec */

  1230.     for (i = 0; i < c->vLumBufSize; i++) {

  1231.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1232.                           dst_stride + 16, fail);

  1233.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1234.     }

  1235.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1236.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1237.     c->uv_off_byte = dst_stride + 16;

  1238.     for (i = 0; i < c->vChrBufSize; i++) {

  1239.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1240.                          dst_stride * 2 + 32, fail);

  1241.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1242.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1243.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1244.     }

  1245.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1246.         for (i = 0; i < c->vLumBufSize; i++) {

  1247.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1248.                               dst_stride + 16, fail);

  1249.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1250.         }

  1251. 

  1252.     // try to avoid drawing green stuff between the right end and the stride end

  1253.     for (i = 0; i < c->vChrBufSize; i++)

  1254.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1255. 

  1256.     assert(c->chrDstH <= dstH);

  1257. 

  1258.     if (flags & SWS_PRINT_INFO) {

  1259.         if (flags & SWS_FAST_BILINEAR)

  1260.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1261.         else if (flags & SWS_BILINEAR)

  1262.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1263.         else if (flags & SWS_BICUBIC)

  1264.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1265.         else if (flags & SWS_X)

  1266.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1267.         else if (flags & SWS_POINT)

  1268.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1269.         else if (flags & SWS_AREA)

  1270.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1271.         else if (flags & SWS_BICUBLIN)

  1272.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1273.         else if (flags & SWS_GAUSS)

  1274.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1275.         else if (flags & SWS_SINC)

  1276.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1277.         else if (flags & SWS_LANCZOS)

  1278.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1279.         else if (flags & SWS_SPLINE)

  1280.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1281.         else

  1282.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1283. 

  1284.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1285.                sws_format_name(srcFormat),

  1286. #ifdef DITHER1XBPP

  1287.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1288.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1289.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1290.                                                              "dithered " : "",

  1291. #else

  1292.                "",

  1293. #endif

  1294.                sws_format_name(dstFormat));

  1295. 

  1296.         if (INLINE_MMXEXT(cpu_flags))

  1297.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1298.         else if (INLINE_AMD3DNOW(cpu_flags))

  1299.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1300.         else if (INLINE_MMX(cpu_flags))

  1301.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1302.         else if (PPC_ALTIVEC(cpu_flags))

  1303.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1304.         else

  1305.             av_log(c, AV_LOG_INFO, "using C\n");

  1306. 

  1307.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1308.         av_log(c, AV_LOG_DEBUG,

  1309.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1310.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1311.         av_log(c, AV_LOG_DEBUG,

  1312.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1313.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1314.                c->chrXInc, c->chrYInc);

  1315.     }

  1316. 

  1317.     c->swscale = ff_getSwsFunc(c);

  1318.     return 0;

  1319. fail: // FIXME replace things by appropriate error codes

  1320.     return -1;

  1321. }

  1322. 

  1323. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1324.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1325.                            int flags, SwsFilter *srcFilter,

  1326.                            SwsFilter *dstFilter, const double *param)

  1327. {

  1328.     SwsContext *c;

  1329. 

  1330.     if (!(c = sws_alloc_context()))

  1331.         return NULL;

  1332. 

  1333.     c->flags     = flags;

  1334.     c->srcW      = srcW;

  1335.     c->srcH      = srcH;

  1336.     c->dstW      = dstW;

  1337.     c->dstH      = dstH;

  1338.     c->srcRange  = handle_jpeg(&srcFormat);

  1339.     c->dstRange  = handle_jpeg(&dstFormat);

  1340.     c->srcFormat = srcFormat;

  1341.     c->dstFormat = dstFormat;

  1342. 

  1343.     if (param) {

  1344.         c->param[0] = param[0];

  1345.         c->param[1] = param[1];

  1346.     }

  1347.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1348.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1349.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1350. 

  1351.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1352.         sws_freeContext(c);

  1353.         return NULL;

  1354.     }

  1355. 

  1356.     return c;

  1357. }

  1358. 

  1359. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1360.                                 float lumaSharpen, float chromaSharpen,

  1361.                                 float chromaHShift, float chromaVShift,

  1362.                                 int verbose)

  1363. {

  1364.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1365.     if (!filter)

  1366.         return NULL;

  1367. 

  1368.     if (lumaGBlur != 0.0) {

  1369.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1370.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1371.     } else {

  1372.         filter->lumH = sws_getIdentityVec();

  1373.         filter->lumV = sws_getIdentityVec();

  1374.     }

  1375. 

  1376.     if (chromaGBlur != 0.0) {

  1377.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1378.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1379.     } else {

  1380.         filter->chrH = sws_getIdentityVec();

  1381.         filter->chrV = sws_getIdentityVec();

  1382.     }

  1383. 

  1384.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1385.         goto fail;

  1386. 

  1387.     if (chromaSharpen != 0.0) {

  1388.         SwsVector *id = sws_getIdentityVec();

  1389.         if (!id)

  1390.             goto fail;

  1391.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1392.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1393.         sws_addVec(filter->chrH, id);

  1394.         sws_addVec(filter->chrV, id);

  1395.         sws_freeVec(id);

  1396.     }

  1397. 

  1398.     if (lumaSharpen != 0.0) {

  1399.         SwsVector *id = sws_getIdentityVec();

  1400.         if (!id)

  1401.             goto fail;

  1402.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1403.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1404.         sws_addVec(filter->lumH, id);

  1405.         sws_addVec(filter->lumV, id);

  1406.         sws_freeVec(id);

  1407.     }

  1408. 

  1409.     if (chromaHShift != 0.0)

  1410.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1411. 

  1412.     if (chromaVShift != 0.0)

  1413.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1414. 

  1415.     sws_normalizeVec(filter->chrH, 1.0);

  1416.     sws_normalizeVec(filter->chrV, 1.0);

  1417.     sws_normalizeVec(filter->lumH, 1.0);

  1418.     sws_normalizeVec(filter->lumV, 1.0);

  1419. 

  1420.     if (verbose)

  1421.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1422.     if (verbose)

  1423.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1424. 

  1425.     return filter;

  1426. 

  1427. fail:

  1428.     sws_freeVec(filter->lumH);

  1429.     sws_freeVec(filter->lumV);

  1430.     sws_freeVec(filter->chrH);

  1431.     sws_freeVec(filter->chrV);

  1432.     av_freep(&filter);

  1433.     return NULL;

  1434. }

  1435. 

  1436. SwsVector *sws_allocVec(int length)

  1437. {

  1438.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1439.     if (!vec)

  1440.         return NULL;

  1441.     vec->length = length;

  1442.     vec->coeff  = av_malloc(sizeof(double) * length);

  1443.     if (!vec->coeff)

  1444.         av_freep(&vec);

  1445.     return vec;

  1446. }

  1447. 

  1448. SwsVector *sws_getGaussianVec(double variance, double quality)

  1449. {

  1450.     const int length = (int)(variance * quality + 0.5) | 1;

  1451.     int i;

  1452.     double middle  = (length - 1) * 0.5;

  1453.     SwsVector *vec = sws_allocVec(length);

  1454. 

  1455.     if (!vec)

  1456.         return NULL;

  1457. 

  1458.     for (i = 0; i < length; i++) {

  1459.         double dist = i - middle;

  1460.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1461.                         sqrt(2 * variance * M_PI);

  1462.     }

  1463. 

  1464.     sws_normalizeVec(vec, 1.0);

  1465. 

  1466.     return vec;

  1467. }

  1468. 

  1469. SwsVector *sws_getConstVec(double c, int length)

  1470. {

  1471.     int i;

  1472.     SwsVector *vec = sws_allocVec(length);

  1473. 

  1474.     if (!vec)

  1475.         return NULL;

  1476. 

  1477.     for (i = 0; i < length; i++)

  1478.         vec->coeff[i] = c;

  1479. 

  1480.     return vec;

  1481. }

  1482. 

  1483. SwsVector *sws_getIdentityVec(void)

  1484. {

  1485.     return sws_getConstVec(1.0, 1);

  1486. }

  1487. 

  1488. static double sws_dcVec(SwsVector *a)

  1489. {

  1490.     int i;

  1491.     double sum = 0;

  1492. 

  1493.     for (i = 0; i < a->length; i++)

  1494.         sum += a->coeff[i];

  1495. 

  1496.     return sum;

  1497. }

  1498. 

  1499. void sws_scaleVec(SwsVector *a, double scalar)

  1500. {

  1501.     int i;

  1502. 

  1503.     for (i = 0; i < a->length; i++)

  1504.         a->coeff[i] *= scalar;

  1505. }

  1506. 

  1507. void sws_normalizeVec(SwsVector *a, double height)

  1508. {

  1509.     sws_scaleVec(a, height / sws_dcVec(a));

  1510. }

  1511. 

  1512. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1513. {

  1514.     int length = a->length + b->length - 1;

  1515.     int i, j;

  1516.     SwsVector *vec = sws_getConstVec(0.0, length);

  1517. 

  1518.     if (!vec)

  1519.         return NULL;

  1520. 

  1521.     for (i = 0; i < a->length; i++) {

  1522.         for (j = 0; j < b->length; j++) {

  1523.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1524.         }

  1525.     }

  1526. 

  1527.     return vec;

  1528. }

  1529. 

  1530. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1531. {

  1532.     int length = FFMAX(a->length, b->length);

  1533.     int i;

  1534.     SwsVector *vec = sws_getConstVec(0.0, length);

  1535. 

  1536.     if (!vec)

  1537.         return NULL;

  1538. 

  1539.     for (i = 0; i < a->length; i++)

  1540.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1541.     for (i = 0; i < b->length; i++)

  1542.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1543. 

  1544.     return vec;

  1545. }

  1546. 

  1547. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1548. {

  1549.     int length = FFMAX(a->length, b->length);

  1550.     int i;

  1551.     SwsVector *vec = sws_getConstVec(0.0, length);

  1552. 

  1553.     if (!vec)

  1554.         return NULL;

  1555. 

  1556.     for (i = 0; i < a->length; i++)

  1557.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1558.     for (i = 0; i < b->length; i++)

  1559.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1560. 

  1561.     return vec;

  1562. }

  1563. 

  1564. /* shift left / or right if "shift" is negative */

  1565. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1566. {

  1567.     int length = a->length + FFABS(shift) * 2;

  1568.     int i;

  1569.     SwsVector *vec = sws_getConstVec(0.0, length);

  1570. 

  1571.     if (!vec)

  1572.         return NULL;

  1573. 

  1574.     for (i = 0; i < a->length; i++) {

  1575.         vec->coeff[i + (length    - 1) / 2 -

  1576.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1577.     }

  1578. 

  1579.     return vec;

  1580. }

  1581. 

  1582. void sws_shiftVec(SwsVector *a, int shift)

  1583. {

  1584.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1585.     av_free(a->coeff);

  1586.     a->coeff  = shifted->coeff;

  1587.     a->length = shifted->length;

  1588.     av_free(shifted);

  1589. }

  1590. 

  1591. void sws_addVec(SwsVector *a, SwsVector *b)

  1592. {

  1593.     SwsVector *sum = sws_sumVec(a, b);

  1594.     av_free(a->coeff);

  1595.     a->coeff  = sum->coeff;

  1596.     a->length = sum->length;

  1597.     av_free(sum);

  1598. }

  1599. 

  1600. void sws_subVec(SwsVector *a, SwsVector *b)

  1601. {

  1602.     SwsVector *diff = sws_diffVec(a, b);

  1603.     av_free(a->coeff);

  1604.     a->coeff  = diff->coeff;

  1605.     a->length = diff->length;

  1606.     av_free(diff);

  1607. }

  1608. 

  1609. void sws_convVec(SwsVector *a, SwsVector *b)

  1610. {

  1611.     SwsVector *conv = sws_getConvVec(a, b);

  1612.     av_free(a->coeff);

  1613.     a->coeff  = conv->coeff;

  1614.     a->length = conv->length;

  1615.     av_free(conv);

  1616. }

  1617. 

  1618. SwsVector *sws_cloneVec(SwsVector *a)

  1619. {

  1620.     int i;

  1621.     SwsVector *vec = sws_allocVec(a->length);

  1622. 

  1623.     if (!vec)

  1624.         return NULL;

  1625. 

  1626.     for (i = 0; i < a->length; i++)

  1627.         vec->coeff[i] = a->coeff[i];

  1628. 

  1629.     return vec;

  1630. }

  1631. 

  1632. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1633. {

  1634.     int i;

  1635.     double max = 0;

  1636.     double min = 0;

  1637.     double range;

  1638. 

  1639.     for (i = 0; i < a->length; i++)

  1640.         if (a->coeff[i] > max)

  1641.             max = a->coeff[i];

  1642. 

  1643.     for (i = 0; i < a->length; i++)

  1644.         if (a->coeff[i] < min)

  1645.             min = a->coeff[i];

  1646. 

  1647.     range = max - min;

  1648. 

  1649.     for (i = 0; i < a->length; i++) {

  1650.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1651.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1652.         for (; x > 0; x--)

  1653.             av_log(log_ctx, log_level, " ");

  1654.         av_log(log_ctx, log_level, "|\n");

  1655.     }

  1656. }

  1657. 

  1658. void sws_freeVec(SwsVector *a)

  1659. {

  1660.     if (!a)

  1661.         return;

  1662.     av_freep(&a->coeff);

  1663.     a->length = 0;

  1664.     av_free(a);

  1665. }

  1666. 

  1667. void sws_freeFilter(SwsFilter *filter)

  1668. {

  1669.     if (!filter)

  1670.         return;

  1671. 

  1672.     if (filter->lumH)

  1673.         sws_freeVec(filter->lumH);

  1674.     if (filter->lumV)

  1675.         sws_freeVec(filter->lumV);

  1676.     if (filter->chrH)

  1677.         sws_freeVec(filter->chrH);

  1678.     if (filter->chrV)

  1679.         sws_freeVec(filter->chrV);

  1680.     av_free(filter);

  1681. }

  1682. 

  1683. void sws_freeContext(SwsContext *c)

  1684. {

  1685.     int i;

  1686.     if (!c)

  1687.         return;

  1688. 

  1689.     if (c->lumPixBuf) {

  1690.         for (i = 0; i < c->vLumBufSize; i++)

  1691.             av_freep(&c->lumPixBuf[i]);

  1692.         av_freep(&c->lumPixBuf);

  1693.     }

  1694. 

  1695.     if (c->chrUPixBuf) {

  1696.         for (i = 0; i < c->vChrBufSize; i++)

  1697.             av_freep(&c->chrUPixBuf[i]);

  1698.         av_freep(&c->chrUPixBuf);

  1699.         av_freep(&c->chrVPixBuf);

  1700.     }

  1701. 

  1702.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1703.         for (i = 0; i < c->vLumBufSize; i++)

  1704.             av_freep(&c->alpPixBuf[i]);

  1705.         av_freep(&c->alpPixBuf);

  1706.     }

  1707. 

  1708.     av_freep(&c->vLumFilter);

  1709.     av_freep(&c->vChrFilter);

  1710.     av_freep(&c->hLumFilter);

  1711.     av_freep(&c->hChrFilter);

  1712. #if HAVE_ALTIVEC

  1713.     av_freep(&c->vYCoeffsBank);

  1714.     av_freep(&c->vCCoeffsBank);

  1715. #endif

  1716. 

  1717.     av_freep(&c->vLumFilterPos);

  1718.     av_freep(&c->vChrFilterPos);

  1719.     av_freep(&c->hLumFilterPos);

  1720.     av_freep(&c->hChrFilterPos);

  1721. 

  1722. #if HAVE_MMX_INLINE

  1723. #if USE_MMAP

  1724.     if (c->lumMmxextFilterCode)

  1725.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1726.     if (c->chrMmxextFilterCode)

  1727.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1728. #elif HAVE_VIRTUALALLOC

  1729.     if (c->lumMmxextFilterCode)

  1730.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1731.     if (c->chrMmxextFilterCode)

  1732.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1733. #else

  1734.     av_free(c->lumMmxextFilterCode);

  1735.     av_free(c->chrMmxextFilterCode);

  1736. #endif

  1737.     c->lumMmxextFilterCode = NULL;

  1738.     c->chrMmxextFilterCode = NULL;

  1739. #endif /* HAVE_MMX_INLINE */

  1740. 

  1741.     av_freep(&c->yuvTable);

  1742.     av_free(c->formatConvBuffer);

  1743. 

  1744.     av_free(c);

  1745. }

  1746. 

  1747. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1748.                                         int srcH, enum AVPixelFormat srcFormat,

  1749.                                         int dstW, int dstH,

  1750.                                         enum AVPixelFormat dstFormat, int flags,

  1751.                                         SwsFilter *srcFilter,

  1752.                                         SwsFilter *dstFilter,

  1753.                                         const double *param)

  1754. {

  1755.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1756.                                              SWS_PARAM_DEFAULT };

  1757. 

  1758.     if (!param)

  1759.         param = default_param;

  1760. 

  1761.     if (context &&

  1762.         (context->srcW      != srcW      ||

  1763.          context->srcH      != srcH      ||

  1764.          context->srcFormat != srcFormat ||

  1765.          context->dstW      != dstW      ||

  1766.          context->dstH      != dstH      ||

  1767.          context->dstFormat != dstFormat ||

  1768.          context->flags     != flags     ||

  1769.          context->param[0]  != param[0]  ||

  1770.          context->param[1]  != param[1])) {

  1771.         sws_freeContext(context);

  1772.         context = NULL;

  1773.     }

  1774. 

  1775.     if (!context) {

  1776.         if (!(context = sws_alloc_context()))

  1777.             return NULL;

  1778.         context->srcW      = srcW;

  1779.         context->srcH      = srcH;

  1780.         context->srcRange  = handle_jpeg(&srcFormat);

  1781.         context->srcFormat = srcFormat;

  1782.         context->dstW      = dstW;

  1783.         context->dstH      = dstH;

  1784.         context->dstRange  = handle_jpeg(&dstFormat);

  1785.         context->dstFormat = dstFormat;

  1786.         context->flags     = flags;

  1787.         context->param[0]  = param[0];

  1788.         context->param[1]  = param[1];

  1789.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1790.                                  context->srcRange,

  1791.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1792.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1793.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1794.             sws_freeContext(context);

  1795.             return NULL;

  1796.         }

  1797.     }

  1798.     return context;

  1799. }