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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_UYVY422]     = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  178. };

  179. 

  180. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  181. {

  182.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  183.            format_entries[pix_fmt].is_supported_in : 0;

  184. }

  185. 

  186. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  187. {

  188.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  189.            format_entries[pix_fmt].is_supported_out : 0;

  190. }

  191. 

  192. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  193. {

  194.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  195.            format_entries[pix_fmt].is_supported_endianness : 0;

  196. }

  197. 

  198. const char *sws_format_name(enum AVPixelFormat format)

  199. {

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

  201.     if (desc)

  202.         return desc->name;

  203.     else

  204.         return "Unknown format";

  205. }

  206. 

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

  208.                              double dist)

  209. {

  210.     if (dist <= 1.0)

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

  212.     else

  213.         return getSplineCoeff(0.0,

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

  215.                                c + 3.0 * d,

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

  217.                               dist - 1.0);

  218. }

  219. 

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

  221.                               int *outFilterSize, int xInc, int srcW,

  222.                               int dstW, int filterAlign, int one,

  223.                               int flags, int cpu_flags,

  224.                               SwsVector *srcFilter, SwsVector *dstFilter,

  225.                               double param[2], int is_horizontal)

  226. {

  227.     int i;

  228.     int filterSize;

  229.     int filter2Size;

  230.     int minFilterSize;

  231.     int64_t *filter    = NULL;

  232.     int64_t *filter2   = NULL;

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

  234.     int ret            = -1;

  235. 

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

  237. 

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

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

  240. 

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

  242.         int i;

  243.         filterSize = 1;

  244.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  246. 

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

  248.             filter[i * filterSize] = fone;

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

  250.         }

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

  252.         int i;

  253.         int xDstInSrc;

  254.         filterSize = 1;

  255.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  257. 

  258.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  261. 

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

  263.             filter[i]       = fone;

  264.             xDstInSrc      += xInc;

  265.         }

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

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

  268.         int i;

  269.         int xDstInSrc;

  270.         filterSize = 2;

  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.             int j;

  278. 

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

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

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

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

  283.                                 (fone >> 16);

  284.                 if (coeff < 0)

  285.                     coeff = 0;

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

  287.                 xx++;

  288.             }

  289.             xDstInSrc += xInc;

  290.         }

  291.     } else {

  292.         int64_t xDstInSrc;

  293.         int sizeFactor;

  294. 

  295.         if (flags & SWS_BICUBIC)

  296.             sizeFactor = 4;

  297.         else if (flags & SWS_X)

  298.             sizeFactor = 8;

  299.         else if (flags & SWS_AREA)

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

  301.         else if (flags & SWS_GAUSS)

  302.             sizeFactor = 8;     // infinite ;)

  303.         else if (flags & SWS_LANCZOS)

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

  305.         else if (flags & SWS_SINC)

  306.             sizeFactor = 20;    // infinite ;)

  307.         else if (flags & SWS_SPLINE)

  308.             sizeFactor = 20;    // infinite ;)

  309.         else if (flags & SWS_BILINEAR)

  310.             sizeFactor = 2;

  311.         else {

  312.             sizeFactor = 0;     // GCC warning killer

  313.             assert(0);

  314.         }

  315. 

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

  317.             filterSize = 1 + sizeFactor;    // upscale

  318.         else

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

  320. 

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

  322.         filterSize = FFMAX(filterSize, 1);

  323. 

  324.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  326. 

  327.         xDstInSrc = xInc - 0x10000;

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

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

  330.             int j;

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

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

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

  334.                 double floatd;

  335.                 int64_t coeff;

  336. 

  337.                 if (xInc > 1 << 16)

  338.                     d = d * dstW / srcW;

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

  340. 

  341.                 if (flags & SWS_BICUBIC) {

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

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

  344. 

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

  346.                         coeff = 0.0;

  347.                     } else {

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

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

  350. 

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

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

  353.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  354.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  355.                         else

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

  357.                                       (6 * B + 30 * C) * dd  +

  358.                                     (-12 * B - 48 * C) * d   +

  359.                                       (8 * B + 24 * C) * (1 << 30);

  360.                     }

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

  362.                 }

  363. #if 0

  364.                 else if (flags & SWS_X) {

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

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

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

  368.                 }

  369. #endif

  370.                 else if (flags & SWS_X) {

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

  372.                     double c;

  373. 

  374.                     if (floatd < 1.0)

  375.                         c = cos(floatd * M_PI);

  376.                     else

  377.                         c = -1.0;

  378.                     if (c < 0.0)

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

  380.                     else

  381.                         c = pow(c, A);

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

  383.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  389.                     else

  390.                         coeff = 0.0;

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

  392.                 } else if (flags & SWS_GAUSS) {

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

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

  395.                 } else if (flags & SWS_SINC) {

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

  397.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  401.                     if (floatd > p)

  402.                         coeff = 0;

  403.                 } else if (flags & SWS_BILINEAR) {

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

  405.                     if (coeff < 0)

  406.                         coeff = 0;

  407.                     coeff *= fone >> 30;

  408.                 } else if (flags & SWS_SPLINE) {

  409.                     double p = -2.196152422706632;

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

  411.                 } else {

  412.                     coeff = 0.0; // GCC warning killer

  413.                     assert(0);

  414.                 }

  415. 

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

  417.                 xx++;

  418.             }

  419.             xDstInSrc += 2 * xInc;

  420.         }

  421.     }

  422. 

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

  424.      * av_free(filter);

  425.      */

  426.     assert(filterSize > 0);

  427.     filter2Size = filterSize;

  428.     if (srcFilter)

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

  430.     if (dstFilter)

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

  432.     assert(filter2Size > 0);

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

  434. 

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

  436.         int j, k;

  437. 

  438.         if (srcFilter) {

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

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

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

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

  443.             }

  444.         } else {

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

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

  447.         }

  448.         // FIXME dstFilter

  449. 

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

  451.     }

  452.     av_freep(&filter);

  453. 

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

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

  456.     minFilterSize = 0;

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

  458.         int min = filter2Size;

  459.         int j;

  460.         int64_t cutOff = 0.0;

  461. 

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

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

  464.             int k;

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

  466. 

  467.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  468.                 break;

  469. 

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

  471.              * filter otherwise */

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

  473.                 break;

  474. 

  475.             // move filter coefficients left

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

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

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

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

  480.         }

  481. 

  482.         cutOff = 0;

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

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

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

  486. 

  487.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  488.                 break;

  489.             min--;

  490.         }

  491. 

  492.         if (min > minFilterSize)

  493.             minFilterSize = min;

  494.     }

  495. 

  496.     if (PPC_ALTIVEC(cpu_flags)) {

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

  498.         if (minFilterSize < 5)

  499.             filterAlign = 4;

  500. 

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

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

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

  504.         if (minFilterSize < 3)

  505.             filterAlign = 1;

  506.     }

  507. 

  508.     if (INLINE_MMX(cpu_flags)) {

  509.         // special case for unscaled vertical filtering

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

  511.             filterAlign = 1;

  512.     }

  513. 

  514.     assert(minFilterSize > 0);

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

  516.     assert(filterSize > 0);

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

  518.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  520.         goto fail;

  521.     *outFilterSize = filterSize;

  522. 

  523.     if (flags & SWS_PRINT_INFO)

  524.         av_log(NULL, AV_LOG_VERBOSE,

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

  526.                filter2Size, filterSize);

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

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

  529.         int j;

  530. 

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

  532.             if (j >= filter2Size)

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

  534.             else

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

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

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

  538.         }

  539.     }

  540. 

  541.     // FIXME try to align filterPos if possible

  542. 

  543.     // fix borders

  544.     if (is_horizontal) {

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

  546.             int j;

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

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

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

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

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

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

  553.                 }

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

  555.             }

  556. 

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

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

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

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

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

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

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

  564.                 }

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

  566.             }

  567.         }

  568.     }

  569. 

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

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

  572.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  574. 

  575.     /* normalize & store in outFilter */

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

  577.         int j;

  578.         int64_t error = 0;

  579.         int64_t sum   = 0;

  580. 

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

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

  583.         }

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

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

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

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

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

  589.             error                                  = v - intV * sum;

  590.         }

  591.     }

  592. 

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

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

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

  596.                                                       * read over the end */

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

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

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

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

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

  602.     }

  603. 

  604.     ret = 0;

  605. 

  606. fail:

  607.     av_free(filter);

  608.     av_free(filter2);

  609.     return ret;

  610. }

  611. 

  612. #if HAVE_MMXEXT_INLINE

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

  614.                                        int16_t *filter, int32_t *filterPos,

  615.                                        int numSplits)

  616. {

  617.     uint8_t *fragmentA;

  618.     x86_reg imm8OfPShufW1A;

  619.     x86_reg imm8OfPShufW2A;

  620.     x86_reg fragmentLengthA;

  621.     uint8_t *fragmentB;

  622.     x86_reg imm8OfPShufW1B;

  623.     x86_reg imm8OfPShufW2B;

  624.     x86_reg fragmentLengthB;

  625.     int fragmentPos;

  626. 

  627.     int xpos, i;

  628. 

  629.     // create an optimized horizontal scaling routine

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

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

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

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

  634.      */

  635. 

  636.     // code fragment

  637. 

  638.     __asm__ volatile (

  639.         "jmp                         9f                 \n\t"

  640.         // Begin

  641.         "0:                                             \n\t"

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

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

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

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

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

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

  648.         "1:                                             \n\t"

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

  650.         "2:                                             \n\t"

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

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

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

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

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

  656. 

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

  658. 

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

  660.         // End

  661.         "9:                                             \n\t"

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

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

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

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

  666.         "dec                         %1                 \n\t"

  667.         "dec                         %2                 \n\t"

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

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

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

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

  672. 

  673. 

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

  675.           "=r" (fragmentLengthA)

  676.         );

  677. 

  678.     __asm__ volatile (

  679.         "jmp                         9f                 \n\t"

  680.         // Begin

  681.         "0:                                             \n\t"

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

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

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

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

  686.         "1:                                             \n\t"

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

  688.         "2:                                             \n\t"

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

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

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

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

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

  694. 

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

  696. 

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

  698.         // End

  699.         "9:                                             \n\t"

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

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

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

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

  704.         "dec                         %1                 \n\t"

  705.         "dec                         %2                 \n\t"

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

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

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

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

  710. 

  711. 

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

  713.           "=r" (fragmentLengthB)

  714.         );

  715. 

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

  717.     fragmentPos = 0;

  718. 

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

  720.         int xx = xpos >> 16;

  721. 

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

  723.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  733.             int shift              = 0;

  734. 

  735.             if (filterCode) {

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

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

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

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

  740.                 filterPos[i / 2] = xx;

  741. 

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

  743. 

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

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

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

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

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

  749.                                                                (c << 4) |

  750.                                                                (d << 6);

  751. 

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

  753.                     shift = maxShift;               // avoid overread

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

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

  756. 

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

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

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

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

  761.                 }

  762.             }

  763. 

  764.             fragmentPos += fragmentLength;

  765. 

  766.             if (filterCode)

  767.                 filterCode[fragmentPos] = RET;

  768.         }

  769.         xpos += xInc;

  770.     }

  771.     if (filterCode)

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

  773. 

  774.     return fragmentPos + 1;

  775. }

  776. #endif /* HAVE_MMXEXT_INLINE */

  777. 

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

  779. {

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

  781.     *h = desc->log2_chroma_w;

  782.     *v = desc->log2_chroma_h;

  783. }

  784. 

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

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

  787.                              int brightness, int contrast, int saturation)

  788. {

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

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

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

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

  793. 

  794.     c->brightness = brightness;

  795.     c->contrast   = contrast;

  796.     c->saturation = saturation;

  797.     c->srcRange   = srcRange;

  798.     c->dstRange   = dstRange;

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

  800.         return -1;

  801. 

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

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

  804. 

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

  806.                              contrast, saturation);

  807.     // FIXME factorize

  808. 

  809.     if (ARCH_PPC)

  810.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  811.                                    contrast, saturation);

  812.     return 0;

  813. }

  814. 

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

  816.                              int *srcRange, int **table, int *dstRange,

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

  818. {

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

  820.         return -1;

  821. 

  822.     *inv_table  = c->srcColorspaceTable;

  823.     *table      = c->dstColorspaceTable;

  824.     *srcRange   = c->srcRange;

  825.     *dstRange   = c->dstRange;

  826.     *brightness = c->brightness;

  827.     *contrast   = c->contrast;

  828.     *saturation = c->saturation;

  829. 

  830.     return 0;

  831. }

  832. 

  833. static int handle_jpeg(enum AVPixelFormat *format)

  834. {

  835.     switch (*format) {

  836.     case AV_PIX_FMT_YUVJ420P:

  837.         *format = AV_PIX_FMT_YUV420P;

  838.         return 1;

  839.     case AV_PIX_FMT_YUVJ422P:

  840.         *format = AV_PIX_FMT_YUV422P;

  841.         return 1;

  842.     case AV_PIX_FMT_YUVJ444P:

  843.         *format = AV_PIX_FMT_YUV444P;

  844.         return 1;

  845.     case AV_PIX_FMT_YUVJ440P:

  846.         *format = AV_PIX_FMT_YUV440P;

  847.         return 1;

  848.     default:

  849.         return 0;

  850.     }

  851. }

  852. 

  853. SwsContext *sws_alloc_context(void)

  854. {

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

  856. 

  857.     if (c) {

  858.         c->av_class = &sws_context_class;

  859.         av_opt_set_defaults(c);

  860.     }

  861. 

  862.     return c;

  863. }

  864. 

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

  866.                              SwsFilter *dstFilter)

  867. {

  868.     int i;

  869.     int usesVFilter, usesHFilter;

  870.     int unscaled;

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

  872.     int srcW              = c->srcW;

  873.     int srcH              = c->srcH;

  874.     int dstW              = c->dstW;

  875.     int dstH              = c->dstH;

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

  877.     int dst_stride_px     = dst_stride >> 1;

  878.     int flags, cpu_flags;

  879.     enum AVPixelFormat srcFormat = c->srcFormat;

  880.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  883. 

  884.     cpu_flags = av_get_cpu_flags();

  885.     flags     = c->flags;

  886.     emms_c();

  887.     if (!rgb15to16)

  888.         sws_rgb2rgb_init();

  889. 

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

  891. 

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

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

  894.     if (!sws_isSupportedInput(srcFormat)) {

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

  896.                sws_format_name(srcFormat));

  897.         return AVERROR(EINVAL);

  898.     }

  899.     if (!sws_isSupportedOutput(dstFormat)) {

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

  901.                sws_format_name(dstFormat));

  902.         return AVERROR(EINVAL);

  903.     }

  904.     }

  905. 

  906.     i = flags & (SWS_POINT         |

  907.                  SWS_AREA          |

  908.                  SWS_BILINEAR      |

  909.                  SWS_FAST_BILINEAR |

  910.                  SWS_BICUBIC       |

  911.                  SWS_X             |

  912.                  SWS_GAUSS         |

  913.                  SWS_LANCZOS       |

  914.                  SWS_SINC          |

  915.                  SWS_SPLINE        |

  916.                  SWS_BICUBLIN);

  917. 

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

  919.     if (!i) {

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

  921.             flags |= SWS_GAUSS;

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

  923.             flags |= SWS_SINC;

  924.         else

  925.             flags |= SWS_LANCZOS;

  926.         c->flags = flags;

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

  928.         av_log(c, AV_LOG_ERROR,

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

  930.         return AVERROR(EINVAL);

  931.     }

  932.     /* sanity check */

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

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

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

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

  937.                srcW, srcH, dstW, dstH);

  938.         return AVERROR(EINVAL);

  939.     }

  940. 

  941.     if (!dstFilter)

  942.         dstFilter = &dummyFilter;

  943.     if (!srcFilter)

  944.         srcFilter = &dummyFilter;

  945. 

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

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

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

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

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

  951. 

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

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

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

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

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

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

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

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

  960. 

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

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

  963. 

  964.     if (isPlanarRGB(dstFormat)) {

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

  966.             av_log(c, AV_LOG_DEBUG,

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

  968.                    av_get_pix_fmt_name(dstFormat));

  969.             flags   |= SWS_FULL_CHR_H_INT;

  970.             c->flags = flags;

  971.         }

  972.     }

  973. 

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

  975.      * chroma interpolation */

  976.     if (flags & SWS_FULL_CHR_H_INT &&

  977.         isAnyRGB(dstFormat)        &&

  978.         !isPlanarRGB(dstFormat)    &&

  979.         dstFormat != AV_PIX_FMT_RGBA  &&

  980.         dstFormat != AV_PIX_FMT_ARGB  &&

  981.         dstFormat != AV_PIX_FMT_BGRA  &&

  982.         dstFormat != AV_PIX_FMT_ABGR  &&

  983.         dstFormat != AV_PIX_FMT_RGB24 &&

  984.         dstFormat != AV_PIX_FMT_BGR24) {

  985.         av_log(c, AV_LOG_ERROR,

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

  987.                sws_format_name(dstFormat));

  988.         flags   &= ~SWS_FULL_CHR_H_INT;

  989.         c->flags = flags;

  990.     }

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

  992.         c->chrDstHSubSample = 1;

  993. 

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

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

  996.                            SWS_SRC_V_CHR_DROP_SHIFT;

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

  998. 

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

  1000.      * wants full chroma */

  1001.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1002.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1003.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1004.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1005.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1006.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1007.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1008.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1009.          (flags & SWS_FAST_BILINEAR)))

  1010.         c->chrSrcHSubSample = 1;

  1011. 

  1012.     // Note the -((-x)>>y) is so that we always round toward +inf.

  1013.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  1014.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  1015.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  1016.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  1017. 

  1018.     /* unscaled special cases */

  1019.     if (unscaled && !usesHFilter && !usesVFilter &&

  1020.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1021.         ff_get_unscaled_swscale(c);

  1022. 

  1023.         if (c->swscale) {

  1024.             if (flags & SWS_PRINT_INFO)

  1025.                 av_log(c, AV_LOG_INFO,

  1026.                        "using unscaled %s -> %s special converter\n",

  1027.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1028.             return 0;

  1029.         }

  1030.     }

  1031. 

  1032.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1033.     if (c->srcBpc < 8)

  1034.         c->srcBpc = 8;

  1035.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1036.     if (c->dstBpc < 8)

  1037.         c->dstBpc = 8;

  1038.     if (c->dstBpc == 16)

  1039.         dst_stride <<= 1;

  1040.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1041.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1042.                      fail);

  1043.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

  1044.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1045.                               (srcW & 15) == 0) ? 1 : 0;

  1046.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1047.             && (flags & SWS_FAST_BILINEAR)) {

  1048.             if (flags & SWS_PRINT_INFO)

  1049.                 av_log(c, AV_LOG_INFO,

  1050.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1051.         }

  1052.         if (usesHFilter)

  1053.             c->canMMXEXTBeUsed = 0;

  1054.     } else

  1055.         c->canMMXEXTBeUsed = 0;

  1056. 

  1057.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1058.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1059. 

  1060.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1061.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1062.      * correct scaling.

  1063.      * n-2 is the last chrominance sample available.

  1064.      * This is not perfect, but no one should notice the difference, the more

  1065.      * correct variant would be like the vertical one, but that would require

  1066.      * some special code for the first and last pixel */

  1067.     if (flags & SWS_FAST_BILINEAR) {

  1068.         if (c->canMMXEXTBeUsed) {

  1069.             c->lumXInc += 20;

  1070.             c->chrXInc += 20;

  1071.         }

  1072.         // we don't use the x86 asm scaler if MMX is available

  1073.         else if (INLINE_MMX(cpu_flags)) {

  1074.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1075.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1076.         }

  1077.     }

  1078. 

  1079. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1080. 

  1081.     /* precalculate horizontal scaler filter coefficients */

  1082.     {

  1083. #if HAVE_MMXEXT_INLINE

  1084. // can't downscale !!!

  1085.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1086.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1087.                                                              NULL, NULL, 8);

  1088.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1089.                                                              NULL, NULL, NULL, 4);

  1090. 

  1091. #if USE_MMAP

  1092.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1093.                                           PROT_READ | PROT_WRITE,

  1094.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1095.                                           -1, 0);

  1096.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1097.                                           PROT_READ | PROT_WRITE,

  1098.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1099.                                           -1, 0);

  1100. #elif HAVE_VIRTUALALLOC

  1101.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1102.                                                   c->lumMmxextFilterCodeSize,

  1103.                                                   MEM_COMMIT,

  1104.                                                   PAGE_EXECUTE_READWRITE);

  1105.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1106.                                                   c->chrMmxextFilterCodeSize,

  1107.                                                   MEM_COMMIT,

  1108.                                                   PAGE_EXECUTE_READWRITE);

  1109. #else

  1110.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1111.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1112. #endif

  1113. 

  1114.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1115.                 return AVERROR(ENOMEM);

  1116.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1117.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1118.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1119.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1120. 

  1121.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1122.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1123.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1124.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1125. 

  1126. #if USE_MMAP

  1127.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1128.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1129. #endif

  1130.         } else

  1131. #endif /* HAVE_MMXEXT_INLINE */

  1132.         {

  1133.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1134.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1135. 

  1136.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1137.                            &c->hLumFilterSize, c->lumXInc,

  1138.                            srcW, dstW, filterAlign, 1 << 14,

  1139.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1140.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1141.                            c->param, 1) < 0)

  1142.                 goto fail;

  1143.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1144.                            &c->hChrFilterSize, c->chrXInc,

  1145.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1146.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1147.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1148.                            c->param, 1) < 0)

  1149.                 goto fail;

  1150.         }

  1151.     } // initialize horizontal stuff

  1152. 

  1153.     /* precalculate vertical scaler filter coefficients */

  1154.     {

  1155.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1156.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1157. 

  1158.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1159.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1160.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1161.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1162.                        c->param, 0) < 0)

  1163.             goto fail;

  1164.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1165.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1166.                        filterAlign, (1 << 12),

  1167.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1168.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1169.                        c->param, 0) < 0)

  1170.             goto fail;

  1171. 

  1172. #if HAVE_ALTIVEC

  1173.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1174.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1175. 

  1176.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1177.             int j;

  1178.             short *p = (short *)&c->vYCoeffsBank[i];

  1179.             for (j = 0; j < 8; j++)

  1180.                 p[j] = c->vLumFilter[i];

  1181.         }

  1182. 

  1183.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1184.             int j;

  1185.             short *p = (short *)&c->vCCoeffsBank[i];

  1186.             for (j = 0; j < 8; j++)

  1187.                 p[j] = c->vChrFilter[i];

  1188.         }

  1189. #endif

  1190.     }

  1191. 

  1192.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1193.     c->vLumBufSize = c->vLumFilterSize;

  1194.     c->vChrBufSize = c->vChrFilterSize;

  1195.     for (i = 0; i < dstH; i++) {

  1196.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1197.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1198.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1199.                                << c->chrSrcVSubSample));

  1200. 

  1201.         nextSlice >>= c->chrSrcVSubSample;

  1202.         nextSlice <<= c->chrSrcVSubSample;

  1203.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1204.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1205.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1206.             (nextSlice >> c->chrSrcVSubSample))

  1207.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1208.                              c->vChrFilterPos[chrI];

  1209.     }

  1210. 

  1211.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1212.      * need to allocate several megabytes to handle all possible cases) */

  1213.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1214.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1215.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1216.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1217.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1218.     /* Note we need at least one pixel more at the end because of the MMX code

  1219.      * (just in case someone wants to replace the 4000/8000). */

  1220.     /* align at 16 bytes for AltiVec */

  1221.     for (i = 0; i < c->vLumBufSize; i++) {

  1222.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1223.                           dst_stride + 16, fail);

  1224.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1225.     }

  1226.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1227.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1228.     c->uv_off_byte = dst_stride + 16;

  1229.     for (i = 0; i < c->vChrBufSize; i++) {

  1230.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1231.                          dst_stride * 2 + 32, fail);

  1232.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1233.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1234.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1235.     }

  1236.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1237.         for (i = 0; i < c->vLumBufSize; i++) {

  1238.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1239.                               dst_stride + 16, fail);

  1240.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1241.         }

  1242. 

  1243.     // try to avoid drawing green stuff between the right end and the stride end

  1244.     for (i = 0; i < c->vChrBufSize; i++)

  1245.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1246. 

  1247.     assert(c->chrDstH <= dstH);

  1248. 

  1249.     if (flags & SWS_PRINT_INFO) {

  1250.         if (flags & SWS_FAST_BILINEAR)

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

  1252.         else if (flags & SWS_BILINEAR)

  1253.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1254.         else if (flags & SWS_BICUBIC)

  1255.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1256.         else if (flags & SWS_X)

  1257.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1258.         else if (flags & SWS_POINT)

  1259.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1260.         else if (flags & SWS_AREA)

  1261.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1262.         else if (flags & SWS_BICUBLIN)

  1263.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1264.         else if (flags & SWS_GAUSS)

  1265.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1266.         else if (flags & SWS_SINC)

  1267.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1268.         else if (flags & SWS_LANCZOS)

  1269.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1270.         else if (flags & SWS_SPLINE)

  1271.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1272.         else

  1273.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1274. 

  1275.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1276.                sws_format_name(srcFormat),

  1277. #ifdef DITHER1XBPP

  1278.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1279.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1280.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1281.                                                              "dithered " : "",

  1282. #else

  1283.                "",

  1284. #endif

  1285.                sws_format_name(dstFormat));

  1286. 

  1287.         if (INLINE_MMXEXT(cpu_flags))

  1288.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1289.         else if (INLINE_AMD3DNOW(cpu_flags))

  1290.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1291.         else if (INLINE_MMX(cpu_flags))

  1292.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1293.         else if (PPC_ALTIVEC(cpu_flags))

  1294.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1295.         else

  1296.             av_log(c, AV_LOG_INFO, "using C\n");

  1297. 

  1298.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1299.         av_log(c, AV_LOG_DEBUG,

  1300.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1301.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1302.         av_log(c, AV_LOG_DEBUG,

  1303.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1304.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1305.                c->chrXInc, c->chrYInc);

  1306.     }

  1307. 

  1308.     c->swscale = ff_getSwsFunc(c);

  1309.     return 0;

  1310. fail: // FIXME replace things by appropriate error codes

  1311.     return -1;

  1312. }

  1313. 

  1314. #if FF_API_SWS_GETCONTEXT

  1315. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1316.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1317.                            int flags, SwsFilter *srcFilter,

  1318.                            SwsFilter *dstFilter, const double *param)

  1319. {

  1320.     SwsContext *c;

  1321. 

  1322.     if (!(c = sws_alloc_context()))

  1323.         return NULL;

  1324. 

  1325.     c->flags     = flags;

  1326.     c->srcW      = srcW;

  1327.     c->srcH      = srcH;

  1328.     c->dstW      = dstW;

  1329.     c->dstH      = dstH;

  1330.     c->srcRange  = handle_jpeg(&srcFormat);

  1331.     c->dstRange  = handle_jpeg(&dstFormat);

  1332.     c->srcFormat = srcFormat;

  1333.     c->dstFormat = dstFormat;

  1334. 

  1335.     if (param) {

  1336.         c->param[0] = param[0];

  1337.         c->param[1] = param[1];

  1338.     }

  1339.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1340.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1341.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1342. 

  1343.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1344.         sws_freeContext(c);

  1345.         return NULL;

  1346.     }

  1347. 

  1348.     return c;

  1349. }

  1350. #endif

  1351. 

  1352. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1353.                                 float lumaSharpen, float chromaSharpen,

  1354.                                 float chromaHShift, float chromaVShift,

  1355.                                 int verbose)

  1356. {

  1357.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1358.     if (!filter)

  1359.         return NULL;

  1360. 

  1361.     if (lumaGBlur != 0.0) {

  1362.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1363.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1364.     } else {

  1365.         filter->lumH = sws_getIdentityVec();

  1366.         filter->lumV = sws_getIdentityVec();

  1367.     }

  1368. 

  1369.     if (chromaGBlur != 0.0) {

  1370.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1371.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1372.     } else {

  1373.         filter->chrH = sws_getIdentityVec();

  1374.         filter->chrV = sws_getIdentityVec();

  1375.     }

  1376. 

  1377.     if (chromaSharpen != 0.0) {

  1378.         SwsVector *id = sws_getIdentityVec();

  1379.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1380.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1381.         sws_addVec(filter->chrH, id);

  1382.         sws_addVec(filter->chrV, id);

  1383.         sws_freeVec(id);

  1384.     }

  1385. 

  1386.     if (lumaSharpen != 0.0) {

  1387.         SwsVector *id = sws_getIdentityVec();

  1388.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1389.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1390.         sws_addVec(filter->lumH, id);

  1391.         sws_addVec(filter->lumV, id);

  1392.         sws_freeVec(id);

  1393.     }

  1394. 

  1395.     if (chromaHShift != 0.0)

  1396.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1397. 

  1398.     if (chromaVShift != 0.0)

  1399.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1400. 

  1401.     sws_normalizeVec(filter->chrH, 1.0);

  1402.     sws_normalizeVec(filter->chrV, 1.0);

  1403.     sws_normalizeVec(filter->lumH, 1.0);

  1404.     sws_normalizeVec(filter->lumV, 1.0);

  1405. 

  1406.     if (verbose)

  1407.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1408.     if (verbose)

  1409.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1410. 

  1411.     return filter;

  1412. }

  1413. 

  1414. SwsVector *sws_allocVec(int length)

  1415. {

  1416.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1417.     if (!vec)

  1418.         return NULL;

  1419.     vec->length = length;

  1420.     vec->coeff  = av_malloc(sizeof(double) * length);

  1421.     if (!vec->coeff)

  1422.         av_freep(&vec);

  1423.     return vec;

  1424. }

  1425. 

  1426. SwsVector *sws_getGaussianVec(double variance, double quality)

  1427. {

  1428.     const int length = (int)(variance * quality + 0.5) | 1;

  1429.     int i;

  1430.     double middle  = (length - 1) * 0.5;

  1431.     SwsVector *vec = sws_allocVec(length);

  1432. 

  1433.     if (!vec)

  1434.         return NULL;

  1435. 

  1436.     for (i = 0; i < length; i++) {

  1437.         double dist = i - middle;

  1438.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1439.                         sqrt(2 * variance * M_PI);

  1440.     }

  1441. 

  1442.     sws_normalizeVec(vec, 1.0);

  1443. 

  1444.     return vec;

  1445. }

  1446. 

  1447. SwsVector *sws_getConstVec(double c, int length)

  1448. {

  1449.     int i;

  1450.     SwsVector *vec = sws_allocVec(length);

  1451. 

  1452.     if (!vec)

  1453.         return NULL;

  1454. 

  1455.     for (i = 0; i < length; i++)

  1456.         vec->coeff[i] = c;

  1457. 

  1458.     return vec;

  1459. }

  1460. 

  1461. SwsVector *sws_getIdentityVec(void)

  1462. {

  1463.     return sws_getConstVec(1.0, 1);

  1464. }

  1465. 

  1466. static double sws_dcVec(SwsVector *a)

  1467. {

  1468.     int i;

  1469.     double sum = 0;

  1470. 

  1471.     for (i = 0; i < a->length; i++)

  1472.         sum += a->coeff[i];

  1473. 

  1474.     return sum;

  1475. }

  1476. 

  1477. void sws_scaleVec(SwsVector *a, double scalar)

  1478. {

  1479.     int i;

  1480. 

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

  1482.         a->coeff[i] *= scalar;

  1483. }

  1484. 

  1485. void sws_normalizeVec(SwsVector *a, double height)

  1486. {

  1487.     sws_scaleVec(a, height / sws_dcVec(a));

  1488. }

  1489. 

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

  1491. {

  1492.     int length = a->length + b->length - 1;

  1493.     int i, j;

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

  1501.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1502.         }

  1503.     }

  1504. 

  1505.     return vec;

  1506. }

  1507. 

  1508. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1509. {

  1510.     int length = FFMAX(a->length, b->length);

  1511.     int i;

  1512.     SwsVector *vec = sws_getConstVec(0.0, length);

  1513. 

  1514.     if (!vec)

  1515.         return NULL;

  1516. 

  1517.     for (i = 0; i < a->length; i++)

  1518.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1519.     for (i = 0; i < b->length; i++)

  1520.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1521. 

  1522.     return vec;

  1523. }

  1524. 

  1525. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1526. {

  1527.     int length = FFMAX(a->length, b->length);

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

  1536.     for (i = 0; i < b->length; i++)

  1537.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1538. 

  1539.     return vec;

  1540. }

  1541. 

  1542. /* shift left / or right if "shift" is negative */

  1543. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1544. {

  1545.     int length = a->length + FFABS(shift) * 2;

  1546.     int i;

  1547.     SwsVector *vec = sws_getConstVec(0.0, length);

  1548. 

  1549.     if (!vec)

  1550.         return NULL;

  1551. 

  1552.     for (i = 0; i < a->length; i++) {

  1553.         vec->coeff[i + (length    - 1) / 2 -

  1554.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1555.     }

  1556. 

  1557.     return vec;

  1558. }

  1559. 

  1560. void sws_shiftVec(SwsVector *a, int shift)

  1561. {

  1562.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1563.     av_free(a->coeff);

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

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

  1566.     av_free(shifted);

  1567. }

  1568. 

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

  1570. {

  1571.     SwsVector *sum = sws_sumVec(a, b);

  1572.     av_free(a->coeff);

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

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

  1575.     av_free(sum);

  1576. }

  1577. 

  1578. void sws_subVec(SwsVector *a, SwsVector *b)

  1579. {

  1580.     SwsVector *diff = sws_diffVec(a, b);

  1581.     av_free(a->coeff);

  1582.     a->coeff  = diff->coeff;

  1583.     a->length = diff->length;

  1584.     av_free(diff);

  1585. }

  1586. 

  1587. void sws_convVec(SwsVector *a, SwsVector *b)

  1588. {

  1589.     SwsVector *conv = sws_getConvVec(a, b);

  1590.     av_free(a->coeff);

  1591.     a->coeff  = conv->coeff;

  1592.     a->length = conv->length;

  1593.     av_free(conv);

  1594. }

  1595. 

  1596. SwsVector *sws_cloneVec(SwsVector *a)

  1597. {

  1598.     int i;

  1599.     SwsVector *vec = sws_allocVec(a->length);

  1600. 

  1601.     if (!vec)

  1602.         return NULL;

  1603. 

  1604.     for (i = 0; i < a->length; i++)

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

  1606. 

  1607.     return vec;

  1608. }

  1609. 

  1610. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1611. {

  1612.     int i;

  1613.     double max = 0;

  1614.     double min = 0;

  1615.     double range;

  1616. 

  1617.     for (i = 0; i < a->length; i++)

  1618.         if (a->coeff[i] > max)

  1619.             max = a->coeff[i];

  1620. 

  1621.     for (i = 0; i < a->length; i++)

  1622.         if (a->coeff[i] < min)

  1623.             min = a->coeff[i];

  1624. 

  1625.     range = max - min;

  1626. 

  1627.     for (i = 0; i < a->length; i++) {

  1628.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1629.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1630.         for (; x > 0; x--)

  1631.             av_log(log_ctx, log_level, " ");

  1632.         av_log(log_ctx, log_level, "|\n");

  1633.     }

  1634. }

  1635. 

  1636. void sws_freeVec(SwsVector *a)

  1637. {

  1638.     if (!a)

  1639.         return;

  1640.     av_freep(&a->coeff);

  1641.     a->length = 0;

  1642.     av_free(a);

  1643. }

  1644. 

  1645. void sws_freeFilter(SwsFilter *filter)

  1646. {

  1647.     if (!filter)

  1648.         return;

  1649. 

  1650.     if (filter->lumH)

  1651.         sws_freeVec(filter->lumH);

  1652.     if (filter->lumV)

  1653.         sws_freeVec(filter->lumV);

  1654.     if (filter->chrH)

  1655.         sws_freeVec(filter->chrH);

  1656.     if (filter->chrV)

  1657.         sws_freeVec(filter->chrV);

  1658.     av_free(filter);

  1659. }

  1660. 

  1661. void sws_freeContext(SwsContext *c)

  1662. {

  1663.     int i;

  1664.     if (!c)

  1665.         return;

  1666. 

  1667.     if (c->lumPixBuf) {

  1668.         for (i = 0; i < c->vLumBufSize; i++)

  1669.             av_freep(&c->lumPixBuf[i]);

  1670.         av_freep(&c->lumPixBuf);

  1671.     }

  1672. 

  1673.     if (c->chrUPixBuf) {

  1674.         for (i = 0; i < c->vChrBufSize; i++)

  1675.             av_freep(&c->chrUPixBuf[i]);

  1676.         av_freep(&c->chrUPixBuf);

  1677.         av_freep(&c->chrVPixBuf);

  1678.     }

  1679. 

  1680.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1681.         for (i = 0; i < c->vLumBufSize; i++)

  1682.             av_freep(&c->alpPixBuf[i]);

  1683.         av_freep(&c->alpPixBuf);

  1684.     }

  1685. 

  1686.     av_freep(&c->vLumFilter);

  1687.     av_freep(&c->vChrFilter);

  1688.     av_freep(&c->hLumFilter);

  1689.     av_freep(&c->hChrFilter);

  1690. #if HAVE_ALTIVEC

  1691.     av_freep(&c->vYCoeffsBank);

  1692.     av_freep(&c->vCCoeffsBank);

  1693. #endif

  1694. 

  1695.     av_freep(&c->vLumFilterPos);

  1696.     av_freep(&c->vChrFilterPos);

  1697.     av_freep(&c->hLumFilterPos);

  1698.     av_freep(&c->hChrFilterPos);

  1699. 

  1700. #if HAVE_MMX_INLINE

  1701. #if USE_MMAP

  1702.     if (c->lumMmxextFilterCode)

  1703.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1704.     if (c->chrMmxextFilterCode)

  1705.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1706. #elif HAVE_VIRTUALALLOC

  1707.     if (c->lumMmxextFilterCode)

  1708.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1709.     if (c->chrMmxextFilterCode)

  1710.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1711. #else

  1712.     av_free(c->lumMmxextFilterCode);

  1713.     av_free(c->chrMmxextFilterCode);

  1714. #endif

  1715.     c->lumMmxextFilterCode = NULL;

  1716.     c->chrMmxextFilterCode = NULL;

  1717. #endif /* HAVE_MMX_INLINE */

  1718. 

  1719.     av_freep(&c->yuvTable);

  1720.     av_free(c->formatConvBuffer);

  1721. 

  1722.     av_free(c);

  1723. }

  1724. 

  1725. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1726.                                         int srcH, enum AVPixelFormat srcFormat,

  1727.                                         int dstW, int dstH,

  1728.                                         enum AVPixelFormat dstFormat, int flags,

  1729.                                         SwsFilter *srcFilter,

  1730.                                         SwsFilter *dstFilter,

  1731.                                         const double *param)

  1732. {

  1733.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1734.                                              SWS_PARAM_DEFAULT };

  1735. 

  1736.     if (!param)

  1737.         param = default_param;

  1738. 

  1739.     if (context &&

  1740.         (context->srcW      != srcW      ||

  1741.          context->srcH      != srcH      ||

  1742.          context->srcFormat != srcFormat ||

  1743.          context->dstW      != dstW      ||

  1744.          context->dstH      != dstH      ||

  1745.          context->dstFormat != dstFormat ||

  1746.          context->flags     != flags     ||

  1747.          context->param[0]  != param[0]  ||

  1748.          context->param[1]  != param[1])) {

  1749.         sws_freeContext(context);

  1750.         context = NULL;

  1751.     }

  1752. 

  1753.     if (!context) {

  1754.         if (!(context = sws_alloc_context()))

  1755.             return NULL;

  1756.         context->srcW      = srcW;

  1757.         context->srcH      = srcH;

  1758.         context->srcRange  = handle_jpeg(&srcFormat);

  1759.         context->srcFormat = srcFormat;

  1760.         context->dstW      = dstW;

  1761.         context->dstH      = dstH;

  1762.         context->dstRange  = handle_jpeg(&dstFormat);

  1763.         context->dstFormat = dstFormat;

  1764.         context->flags     = flags;

  1765.         context->param[0]  = param[0];

  1766.         context->param[1]  = param[1];

  1767.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1768.                                  context->srcRange,

  1769.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1770.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1771.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1772.             sws_freeContext(context);

  1773.             return NULL;

  1774.         }

  1775.     }

  1776.     return context;

  1777. }