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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_YUV422P9BE]  = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  188. };

  189. 

  190. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  191. {

  192.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  193.            format_entries[pix_fmt].is_supported_in : 0;

  194. }

  195. 

  196. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  197. {

  198.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  199.            format_entries[pix_fmt].is_supported_out : 0;

  200. }

  201. 

  202. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  203. {

  204.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  205.            format_entries[pix_fmt].is_supported_endianness : 0;

  206. }

  207. 

  208. const char *sws_format_name(enum AVPixelFormat format)

  209. {

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

  211.     if (desc)

  212.         return desc->name;

  213.     else

  214.         return "Unknown format";

  215. }

  216. 

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

  218.                              double dist)

  219. {

  220.     if (dist <= 1.0)

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

  222.     else

  223.         return getSplineCoeff(0.0,

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

  225.                                c + 3.0 * d,

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

  227.                               dist - 1.0);

  228. }

  229. 

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

  231.                               int *outFilterSize, int xInc, int srcW,

  232.                               int dstW, int filterAlign, int one,

  233.                               int flags, int cpu_flags,

  234.                               SwsVector *srcFilter, SwsVector *dstFilter,

  235.                               double param[2], int is_horizontal)

  236. {

  237.     int i;

  238.     int filterSize;

  239.     int filter2Size;

  240.     int minFilterSize;

  241.     int64_t *filter    = NULL;

  242.     int64_t *filter2   = NULL;

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

  244.     int ret            = -1;

  245. 

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

  247. 

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

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

  250. 

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

  252.         int i;

  253.         filterSize = 1;

  254.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  256. 

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

  258.             filter[i * filterSize] = fone;

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

  260.         }

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

  262.         int i;

  263.         int xDstInSrc;

  264.         filterSize = 1;

  265.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  267. 

  268.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  271. 

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

  273.             filter[i]       = fone;

  274.             xDstInSrc      += xInc;

  275.         }

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

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

  278.         int i;

  279.         int xDstInSrc;

  280.         filterSize = 2;

  281.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  283. 

  284.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  287.             int j;

  288. 

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

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

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

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

  293.                                 (fone >> 16);

  294.                 if (coeff < 0)

  295.                     coeff = 0;

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

  297.                 xx++;

  298.             }

  299.             xDstInSrc += xInc;

  300.         }

  301.     } else {

  302.         int64_t xDstInSrc;

  303.         int sizeFactor;

  304. 

  305.         if (flags & SWS_BICUBIC)

  306.             sizeFactor = 4;

  307.         else if (flags & SWS_X)

  308.             sizeFactor = 8;

  309.         else if (flags & SWS_AREA)

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

  311.         else if (flags & SWS_GAUSS)

  312.             sizeFactor = 8;     // infinite ;)

  313.         else if (flags & SWS_LANCZOS)

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

  315.         else if (flags & SWS_SINC)

  316.             sizeFactor = 20;    // infinite ;)

  317.         else if (flags & SWS_SPLINE)

  318.             sizeFactor = 20;    // infinite ;)

  319.         else if (flags & SWS_BILINEAR)

  320.             sizeFactor = 2;

  321.         else {

  322.             sizeFactor = 0;     // GCC warning killer

  323.             assert(0);

  324.         }

  325. 

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

  327.             filterSize = 1 + sizeFactor;    // upscale

  328.         else

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

  330. 

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

  332.         filterSize = FFMAX(filterSize, 1);

  333. 

  334.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  336. 

  337.         xDstInSrc = xInc - 0x10000;

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

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

  340.             int j;

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

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

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

  344.                 double floatd;

  345.                 int64_t coeff;

  346. 

  347.                 if (xInc > 1 << 16)

  348.                     d = d * dstW / srcW;

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

  350. 

  351.                 if (flags & SWS_BICUBIC) {

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

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

  354. 

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

  356.                         coeff = 0.0;

  357.                     } else {

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

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

  360. 

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

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

  363.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  364.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  365.                         else

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

  367.                                       (6 * B + 30 * C) * dd  +

  368.                                     (-12 * B - 48 * C) * d   +

  369.                                       (8 * B + 24 * C) * (1 << 30);

  370.                     }

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

  372.                 }

  373. #if 0

  374.                 else if (flags & SWS_X) {

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

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

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

  378.                 }

  379. #endif

  380.                 else if (flags & SWS_X) {

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

  382.                     double c;

  383. 

  384.                     if (floatd < 1.0)

  385.                         c = cos(floatd * M_PI);

  386.                     else

  387.                         c = -1.0;

  388.                     if (c < 0.0)

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

  390.                     else

  391.                         c = pow(c, A);

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

  393.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  399.                     else

  400.                         coeff = 0.0;

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

  402.                 } else if (flags & SWS_GAUSS) {

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

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

  405.                 } else if (flags & SWS_SINC) {

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

  407.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  411.                     if (floatd > p)

  412.                         coeff = 0;

  413.                 } else if (flags & SWS_BILINEAR) {

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

  415.                     if (coeff < 0)

  416.                         coeff = 0;

  417.                     coeff *= fone >> 30;

  418.                 } else if (flags & SWS_SPLINE) {

  419.                     double p = -2.196152422706632;

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

  421.                 } else {

  422.                     coeff = 0.0; // GCC warning killer

  423.                     assert(0);

  424.                 }

  425. 

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

  427.                 xx++;

  428.             }

  429.             xDstInSrc += 2 * xInc;

  430.         }

  431.     }

  432. 

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

  434.      * av_free(filter);

  435.      */

  436.     assert(filterSize > 0);

  437.     filter2Size = filterSize;

  438.     if (srcFilter)

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

  440.     if (dstFilter)

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

  442.     assert(filter2Size > 0);

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

  444. 

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

  446.         int j, k;

  447. 

  448.         if (srcFilter) {

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

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

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

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

  453.             }

  454.         } else {

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

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

  457.         }

  458.         // FIXME dstFilter

  459. 

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

  461.     }

  462.     av_freep(&filter);

  463. 

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

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

  466.     minFilterSize = 0;

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

  468.         int min = filter2Size;

  469.         int j;

  470.         int64_t cutOff = 0.0;

  471. 

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

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

  474.             int k;

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

  476. 

  477.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  478.                 break;

  479. 

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

  481.              * filter otherwise */

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

  483.                 break;

  484. 

  485.             // move filter coefficients left

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

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

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

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

  490.         }

  491. 

  492.         cutOff = 0;

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

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

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

  496. 

  497.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  498.                 break;

  499.             min--;

  500.         }

  501. 

  502.         if (min > minFilterSize)

  503.             minFilterSize = min;

  504.     }

  505. 

  506.     if (PPC_ALTIVEC(cpu_flags)) {

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

  508.         if (minFilterSize < 5)

  509.             filterAlign = 4;

  510. 

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

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

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

  514.         if (minFilterSize < 3)

  515.             filterAlign = 1;

  516.     }

  517. 

  518.     if (INLINE_MMX(cpu_flags)) {

  519.         // special case for unscaled vertical filtering

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

  521.             filterAlign = 1;

  522.     }

  523. 

  524.     assert(minFilterSize > 0);

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

  526.     assert(filterSize > 0);

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

  528.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  530.         goto fail;

  531.     *outFilterSize = filterSize;

  532. 

  533.     if (flags & SWS_PRINT_INFO)

  534.         av_log(NULL, AV_LOG_VERBOSE,

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

  536.                filter2Size, filterSize);

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

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

  539.         int j;

  540. 

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

  542.             if (j >= filter2Size)

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

  544.             else

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

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

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

  548.         }

  549.     }

  550. 

  551.     // FIXME try to align filterPos if possible

  552. 

  553.     // fix borders

  554.     if (is_horizontal) {

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

  556.             int j;

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

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

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

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

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

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

  563.                 }

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

  565.             }

  566. 

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

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

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

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

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

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

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

  574.                 }

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

  576.             }

  577.         }

  578.     }

  579. 

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

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

  582.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  584. 

  585.     /* normalize & store in outFilter */

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

  587.         int j;

  588.         int64_t error = 0;

  589.         int64_t sum   = 0;

  590. 

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

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

  593.         }

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

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

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

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

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

  599.             error                                  = v - intV * sum;

  600.         }

  601.     }

  602. 

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

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

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

  606.                                                       * read over the end */

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

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

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

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

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

  612.     }

  613. 

  614.     ret = 0;

  615. 

  616. fail:

  617.     av_free(filter);

  618.     av_free(filter2);

  619.     return ret;

  620. }

  621. 

  622. #if HAVE_MMXEXT_INLINE

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

  624.                                        int16_t *filter, int32_t *filterPos,

  625.                                        int numSplits)

  626. {

  627.     uint8_t *fragmentA;

  628.     x86_reg imm8OfPShufW1A;

  629.     x86_reg imm8OfPShufW2A;

  630.     x86_reg fragmentLengthA;

  631.     uint8_t *fragmentB;

  632.     x86_reg imm8OfPShufW1B;

  633.     x86_reg imm8OfPShufW2B;

  634.     x86_reg fragmentLengthB;

  635.     int fragmentPos;

  636. 

  637.     int xpos, i;

  638. 

  639.     // create an optimized horizontal scaling routine

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

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

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

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

  644.      */

  645. 

  646.     // code fragment

  647. 

  648.     __asm__ volatile (

  649.         "jmp                         9f                 \n\t"

  650.         // Begin

  651.         "0:                                             \n\t"

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

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

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

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

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

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

  658.         "1:                                             \n\t"

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

  660.         "2:                                             \n\t"

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

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

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

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

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

  666. 

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

  668. 

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

  670.         // End

  671.         "9:                                             \n\t"

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

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

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

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

  676.         "dec                         %1                 \n\t"

  677.         "dec                         %2                 \n\t"

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

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

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

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

  682. 

  683. 

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

  685.           "=r" (fragmentLengthA)

  686.         );

  687. 

  688.     __asm__ volatile (

  689.         "jmp                         9f                 \n\t"

  690.         // Begin

  691.         "0:                                             \n\t"

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

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

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

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

  696.         "1:                                             \n\t"

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

  698.         "2:                                             \n\t"

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

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

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

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

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

  704. 

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

  706. 

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

  708.         // End

  709.         "9:                                             \n\t"

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

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

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

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

  714.         "dec                         %1                 \n\t"

  715.         "dec                         %2                 \n\t"

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

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

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

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

  720. 

  721. 

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

  723.           "=r" (fragmentLengthB)

  724.         );

  725. 

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

  727.     fragmentPos = 0;

  728. 

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

  730.         int xx = xpos >> 16;

  731. 

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

  733.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  743.             int shift              = 0;

  744. 

  745.             if (filterCode) {

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

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

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

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

  750.                 filterPos[i / 2] = xx;

  751. 

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

  753. 

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

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

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

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

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

  759.                                                                (c << 4) |

  760.                                                                (d << 6);

  761. 

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

  763.                     shift = maxShift;               // avoid overread

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

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

  766. 

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

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

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

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

  771.                 }

  772.             }

  773. 

  774.             fragmentPos += fragmentLength;

  775. 

  776.             if (filterCode)

  777.                 filterCode[fragmentPos] = RET;

  778.         }

  779.         xpos += xInc;

  780.     }

  781.     if (filterCode)

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

  783. 

  784.     return fragmentPos + 1;

  785. }

  786. #endif /* HAVE_MMXEXT_INLINE */

  787. 

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

  789. {

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

  791.     *h = desc->log2_chroma_w;

  792.     *v = desc->log2_chroma_h;

  793. }

  794. 

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

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

  797.                              int brightness, int contrast, int saturation)

  798. {

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

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

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

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

  803. 

  804.     c->brightness = brightness;

  805.     c->contrast   = contrast;

  806.     c->saturation = saturation;

  807.     c->srcRange   = srcRange;

  808.     c->dstRange   = dstRange;

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

  810.         return -1;

  811. 

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

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

  814. 

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

  816.                              contrast, saturation);

  817.     // FIXME factorize

  818. 

  819.     if (ARCH_PPC)

  820.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  821.                                    contrast, saturation);

  822.     return 0;

  823. }

  824. 

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

  826.                              int *srcRange, int **table, int *dstRange,

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

  828. {

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

  830.         return -1;

  831. 

  832.     *inv_table  = c->srcColorspaceTable;

  833.     *table      = c->dstColorspaceTable;

  834.     *srcRange   = c->srcRange;

  835.     *dstRange   = c->dstRange;

  836.     *brightness = c->brightness;

  837.     *contrast   = c->contrast;

  838.     *saturation = c->saturation;

  839. 

  840.     return 0;

  841. }

  842. 

  843. static int handle_jpeg(enum AVPixelFormat *format)

  844. {

  845.     switch (*format) {

  846.     case AV_PIX_FMT_YUVJ420P:

  847.         *format = AV_PIX_FMT_YUV420P;

  848.         return 1;

  849.     case AV_PIX_FMT_YUVJ422P:

  850.         *format = AV_PIX_FMT_YUV422P;

  851.         return 1;

  852.     case AV_PIX_FMT_YUVJ444P:

  853.         *format = AV_PIX_FMT_YUV444P;

  854.         return 1;

  855.     case AV_PIX_FMT_YUVJ440P:

  856.         *format = AV_PIX_FMT_YUV440P;

  857.         return 1;

  858.     default:

  859.         return 0;

  860.     }

  861. }

  862. 

  863. SwsContext *sws_alloc_context(void)

  864. {

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

  866. 

  867.     if (c) {

  868.         c->av_class = &sws_context_class;

  869.         av_opt_set_defaults(c);

  870.     }

  871. 

  872.     return c;

  873. }

  874. 

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

  876.                              SwsFilter *dstFilter)

  877. {

  878.     int i;

  879.     int usesVFilter, usesHFilter;

  880.     int unscaled;

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

  882.     int srcW              = c->srcW;

  883.     int srcH              = c->srcH;

  884.     int dstW              = c->dstW;

  885.     int dstH              = c->dstH;

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

  887.     int dst_stride_px     = dst_stride >> 1;

  888.     int flags, cpu_flags;

  889.     enum AVPixelFormat srcFormat = c->srcFormat;

  890.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  893. 

  894.     cpu_flags = av_get_cpu_flags();

  895.     flags     = c->flags;

  896.     emms_c();

  897.     if (!rgb15to16)

  898.         sws_rgb2rgb_init();

  899. 

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

  901. 

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

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

  904.     if (!sws_isSupportedInput(srcFormat)) {

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

  906.                sws_format_name(srcFormat));

  907.         return AVERROR(EINVAL);

  908.     }

  909.     if (!sws_isSupportedOutput(dstFormat)) {

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

  911.                sws_format_name(dstFormat));

  912.         return AVERROR(EINVAL);

  913.     }

  914.     }

  915. 

  916.     i = flags & (SWS_POINT         |

  917.                  SWS_AREA          |

  918.                  SWS_BILINEAR      |

  919.                  SWS_FAST_BILINEAR |

  920.                  SWS_BICUBIC       |

  921.                  SWS_X             |

  922.                  SWS_GAUSS         |

  923.                  SWS_LANCZOS       |

  924.                  SWS_SINC          |

  925.                  SWS_SPLINE        |

  926.                  SWS_BICUBLIN);

  927. 

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

  929.     if (!i) {

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

  931.             flags |= SWS_GAUSS;

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

  933.             flags |= SWS_SINC;

  934.         else

  935.             flags |= SWS_LANCZOS;

  936.         c->flags = flags;

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

  938.         av_log(c, AV_LOG_ERROR,

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

  940.         return AVERROR(EINVAL);

  941.     }

  942.     /* sanity check */

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

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

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

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

  947.                srcW, srcH, dstW, dstH);

  948.         return AVERROR(EINVAL);

  949.     }

  950. 

  951.     if (!dstFilter)

  952.         dstFilter = &dummyFilter;

  953.     if (!srcFilter)

  954.         srcFilter = &dummyFilter;

  955. 

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

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

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

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

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

  961. 

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

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

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

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

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

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

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

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

  970. 

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

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

  973. 

  974.     if (isPlanarRGB(dstFormat)) {

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

  976.             av_log(c, AV_LOG_DEBUG,

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

  978.                    av_get_pix_fmt_name(dstFormat));

  979.             flags   |= SWS_FULL_CHR_H_INT;

  980.             c->flags = flags;

  981.         }

  982.     }

  983. 

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

  985.      * chroma interpolation */

  986.     if (flags & SWS_FULL_CHR_H_INT &&

  987.         isAnyRGB(dstFormat)        &&

  988.         !isPlanarRGB(dstFormat)    &&

  989.         dstFormat != AV_PIX_FMT_RGBA  &&

  990.         dstFormat != AV_PIX_FMT_ARGB  &&

  991.         dstFormat != AV_PIX_FMT_BGRA  &&

  992.         dstFormat != AV_PIX_FMT_ABGR  &&

  993.         dstFormat != AV_PIX_FMT_RGB24 &&

  994.         dstFormat != AV_PIX_FMT_BGR24) {

  995.         av_log(c, AV_LOG_ERROR,

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

  997.                sws_format_name(dstFormat));

  998.         flags   &= ~SWS_FULL_CHR_H_INT;

  999.         c->flags = flags;

  1000.     }

  1001.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1002.         c->chrDstHSubSample = 1;

  1003. 

  1004.     // drop some chroma lines if the user wants it

  1005.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1006.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1007.     c->chrSrcVSubSample += c->vChrDrop;

  1008. 

  1009.     /* drop every other pixel for chroma calculation unless user

  1010.      * wants full chroma */

  1011.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1012.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1013.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1014.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1015.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1016.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1017.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1018.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1019.          (flags & SWS_FAST_BILINEAR)))

  1020.         c->chrSrcHSubSample = 1;

  1021. 

  1022.     // Note the -((-x)>>y) is so that we always round toward +inf.

  1023.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  1024.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  1025.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  1026.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  1027. 

  1028.     /* unscaled special cases */

  1029.     if (unscaled && !usesHFilter && !usesVFilter &&

  1030.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1031.         ff_get_unscaled_swscale(c);

  1032. 

  1033.         if (c->swscale) {

  1034.             if (flags & SWS_PRINT_INFO)

  1035.                 av_log(c, AV_LOG_INFO,

  1036.                        "using unscaled %s -> %s special converter\n",

  1037.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1038.             return 0;

  1039.         }

  1040.     }

  1041. 

  1042.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1043.     if (c->srcBpc < 8)

  1044.         c->srcBpc = 8;

  1045.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1046.     if (c->dstBpc < 8)

  1047.         c->dstBpc = 8;

  1048.     if (c->dstBpc == 16)

  1049.         dst_stride <<= 1;

  1050.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1051.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1052.                      fail);

  1053.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

  1054.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1055.                               (srcW & 15) == 0) ? 1 : 0;

  1056.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1057.             && (flags & SWS_FAST_BILINEAR)) {

  1058.             if (flags & SWS_PRINT_INFO)

  1059.                 av_log(c, AV_LOG_INFO,

  1060.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1061.         }

  1062.         if (usesHFilter)

  1063.             c->canMMXEXTBeUsed = 0;

  1064.     } else

  1065.         c->canMMXEXTBeUsed = 0;

  1066. 

  1067.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1068.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1069. 

  1070.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1071.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1072.      * correct scaling.

  1073.      * n-2 is the last chrominance sample available.

  1074.      * This is not perfect, but no one should notice the difference, the more

  1075.      * correct variant would be like the vertical one, but that would require

  1076.      * some special code for the first and last pixel */

  1077.     if (flags & SWS_FAST_BILINEAR) {

  1078.         if (c->canMMXEXTBeUsed) {

  1079.             c->lumXInc += 20;

  1080.             c->chrXInc += 20;

  1081.         }

  1082.         // we don't use the x86 asm scaler if MMX is available

  1083.         else if (INLINE_MMX(cpu_flags)) {

  1084.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1085.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1086.         }

  1087.     }

  1088. 

  1089. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1090. 

  1091.     /* precalculate horizontal scaler filter coefficients */

  1092.     {

  1093. #if HAVE_MMXEXT_INLINE

  1094. // can't downscale !!!

  1095.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1096.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1097.                                                              NULL, NULL, 8);

  1098.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1099.                                                              NULL, NULL, NULL, 4);

  1100. 

  1101. #if USE_MMAP

  1102.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1103.                                           PROT_READ | PROT_WRITE,

  1104.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1105.                                           -1, 0);

  1106.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1107.                                           PROT_READ | PROT_WRITE,

  1108.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1109.                                           -1, 0);

  1110. #elif HAVE_VIRTUALALLOC

  1111.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1112.                                                   c->lumMmxextFilterCodeSize,

  1113.                                                   MEM_COMMIT,

  1114.                                                   PAGE_EXECUTE_READWRITE);

  1115.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1116.                                                   c->chrMmxextFilterCodeSize,

  1117.                                                   MEM_COMMIT,

  1118.                                                   PAGE_EXECUTE_READWRITE);

  1119. #else

  1120.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1121.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1122. #endif

  1123. 

  1124.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1125.                 return AVERROR(ENOMEM);

  1126.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1127.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1128.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1129.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1130. 

  1131.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1132.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1133.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1134.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1135. 

  1136. #if USE_MMAP

  1137.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1138.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1139. #endif

  1140.         } else

  1141. #endif /* HAVE_MMXEXT_INLINE */

  1142.         {

  1143.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1144.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1145. 

  1146.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1147.                            &c->hLumFilterSize, c->lumXInc,

  1148.                            srcW, dstW, filterAlign, 1 << 14,

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

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

  1151.                            c->param, 1) < 0)

  1152.                 goto fail;

  1153.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1154.                            &c->hChrFilterSize, c->chrXInc,

  1155.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1156.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1157.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1158.                            c->param, 1) < 0)

  1159.                 goto fail;

  1160.         }

  1161.     } // initialize horizontal stuff

  1162. 

  1163.     /* precalculate vertical scaler filter coefficients */

  1164.     {

  1165.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1166.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1167. 

  1168.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1169.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1170.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1171.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1172.                        c->param, 0) < 0)

  1173.             goto fail;

  1174.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1175.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1176.                        filterAlign, (1 << 12),

  1177.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1178.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1179.                        c->param, 0) < 0)

  1180.             goto fail;

  1181. 

  1182. #if HAVE_ALTIVEC

  1183.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1184.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1185. 

  1186.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1187.             int j;

  1188.             short *p = (short *)&c->vYCoeffsBank[i];

  1189.             for (j = 0; j < 8; j++)

  1190.                 p[j] = c->vLumFilter[i];

  1191.         }

  1192. 

  1193.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1194.             int j;

  1195.             short *p = (short *)&c->vCCoeffsBank[i];

  1196.             for (j = 0; j < 8; j++)

  1197.                 p[j] = c->vChrFilter[i];

  1198.         }

  1199. #endif

  1200.     }

  1201. 

  1202.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1203.     c->vLumBufSize = c->vLumFilterSize;

  1204.     c->vChrBufSize = c->vChrFilterSize;

  1205.     for (i = 0; i < dstH; i++) {

  1206.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1207.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1208.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1209.                                << c->chrSrcVSubSample));

  1210. 

  1211.         nextSlice >>= c->chrSrcVSubSample;

  1212.         nextSlice <<= c->chrSrcVSubSample;

  1213.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1214.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1215.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

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

  1217.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1218.                              c->vChrFilterPos[chrI];

  1219.     }

  1220. 

  1221.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1222.      * need to allocate several megabytes to handle all possible cases) */

  1223.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

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

  1225.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1226.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1227.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1228.     /* Note we need at least one pixel more at the end because of the MMX code

  1229.      * (just in case someone wants to replace the 4000/8000). */

  1230.     /* align at 16 bytes for AltiVec */

  1231.     for (i = 0; i < c->vLumBufSize; i++) {

  1232.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1233.                           dst_stride + 16, fail);

  1234.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1235.     }

  1236.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1237.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1238.     c->uv_off_byte = dst_stride + 16;

  1239.     for (i = 0; i < c->vChrBufSize; i++) {

  1240.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1241.                          dst_stride * 2 + 32, fail);

  1242.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1243.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1244.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1245.     }

  1246.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1247.         for (i = 0; i < c->vLumBufSize; i++) {

  1248.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1249.                               dst_stride + 16, fail);

  1250.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1251.         }

  1252. 

  1253.     // try to avoid drawing green stuff between the right end and the stride end

  1254.     for (i = 0; i < c->vChrBufSize; i++)

  1255.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1256. 

  1257.     assert(c->chrDstH <= dstH);

  1258. 

  1259.     if (flags & SWS_PRINT_INFO) {

  1260.         if (flags & SWS_FAST_BILINEAR)

  1261.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1262.         else if (flags & SWS_BILINEAR)

  1263.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1264.         else if (flags & SWS_BICUBIC)

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

  1266.         else if (flags & SWS_X)

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

  1268.         else if (flags & SWS_POINT)

  1269.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1270.         else if (flags & SWS_AREA)

  1271.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1272.         else if (flags & SWS_BICUBLIN)

  1273.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1274.         else if (flags & SWS_GAUSS)

  1275.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1276.         else if (flags & SWS_SINC)

  1277.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1278.         else if (flags & SWS_LANCZOS)

  1279.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1280.         else if (flags & SWS_SPLINE)

  1281.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1282.         else

  1283.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1284. 

  1285.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1286.                sws_format_name(srcFormat),

  1287. #ifdef DITHER1XBPP

  1288.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1289.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1290.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1291.                                                              "dithered " : "",

  1292. #else

  1293.                "",

  1294. #endif

  1295.                sws_format_name(dstFormat));

  1296. 

  1297.         if (INLINE_MMXEXT(cpu_flags))

  1298.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1299.         else if (INLINE_AMD3DNOW(cpu_flags))

  1300.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1301.         else if (INLINE_MMX(cpu_flags))

  1302.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1303.         else if (PPC_ALTIVEC(cpu_flags))

  1304.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1305.         else

  1306.             av_log(c, AV_LOG_INFO, "using C\n");

  1307. 

  1308.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1309.         av_log(c, AV_LOG_DEBUG,

  1310.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1311.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1312.         av_log(c, AV_LOG_DEBUG,

  1313.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1314.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1315.                c->chrXInc, c->chrYInc);

  1316.     }

  1317. 

  1318.     c->swscale = ff_getSwsFunc(c);

  1319.     return 0;

  1320. fail: // FIXME replace things by appropriate error codes

  1321.     return -1;

  1322. }

  1323. 

  1324. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1325.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1326.                            int flags, SwsFilter *srcFilter,

  1327.                            SwsFilter *dstFilter, const double *param)

  1328. {

  1329.     SwsContext *c;

  1330. 

  1331.     if (!(c = sws_alloc_context()))

  1332.         return NULL;

  1333. 

  1334.     c->flags     = flags;

  1335.     c->srcW      = srcW;

  1336.     c->srcH      = srcH;

  1337.     c->dstW      = dstW;

  1338.     c->dstH      = dstH;

  1339.     c->srcRange  = handle_jpeg(&srcFormat);

  1340.     c->dstRange  = handle_jpeg(&dstFormat);

  1341.     c->srcFormat = srcFormat;

  1342.     c->dstFormat = dstFormat;

  1343. 

  1344.     if (param) {

  1345.         c->param[0] = param[0];

  1346.         c->param[1] = param[1];

  1347.     }

  1348.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1349.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1350.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1351. 

  1352.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1353.         sws_freeContext(c);

  1354.         return NULL;

  1355.     }

  1356. 

  1357.     return c;

  1358. }

  1359. 

  1360. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1361.                                 float lumaSharpen, float chromaSharpen,

  1362.                                 float chromaHShift, float chromaVShift,

  1363.                                 int verbose)

  1364. {

  1365.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1366.     if (!filter)

  1367.         return NULL;

  1368. 

  1369.     if (lumaGBlur != 0.0) {

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

  1371.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1372.     } else {

  1373.         filter->lumH = sws_getIdentityVec();

  1374.         filter->lumV = sws_getIdentityVec();

  1375.     }

  1376. 

  1377.     if (chromaGBlur != 0.0) {

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

  1379.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1380.     } else {

  1381.         filter->chrH = sws_getIdentityVec();

  1382.         filter->chrV = sws_getIdentityVec();

  1383.     }

  1384. 

  1385.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV) {

  1386.         sws_freeVec(filter->lumH);

  1387.         sws_freeVec(filter->lumV);

  1388.         sws_freeVec(filter->chrH);

  1389.         sws_freeVec(filter->chrV);

  1390.         av_freep(&filter);

  1391.         return NULL;

  1392.     }

  1393. 

  1394.     if (chromaSharpen != 0.0) {

  1395.         SwsVector *id = sws_getIdentityVec();

  1396.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1397.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1398.         sws_addVec(filter->chrH, id);

  1399.         sws_addVec(filter->chrV, id);

  1400.         sws_freeVec(id);

  1401.     }

  1402. 

  1403.     if (lumaSharpen != 0.0) {

  1404.         SwsVector *id = sws_getIdentityVec();

  1405.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1406.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1407.         sws_addVec(filter->lumH, id);

  1408.         sws_addVec(filter->lumV, id);

  1409.         sws_freeVec(id);

  1410.     }

  1411. 

  1412.     if (chromaHShift != 0.0)

  1413.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1414. 

  1415.     if (chromaVShift != 0.0)

  1416.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1417. 

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

  1419.     sws_normalizeVec(filter->chrV, 1.0);

  1420.     sws_normalizeVec(filter->lumH, 1.0);

  1421.     sws_normalizeVec(filter->lumV, 1.0);

  1422. 

  1423.     if (verbose)

  1424.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1425.     if (verbose)

  1426.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1427. 

  1428.     return filter;

  1429. }

  1430. 

  1431. SwsVector *sws_allocVec(int length)

  1432. {

  1433.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1434.     if (!vec)

  1435.         return NULL;

  1436.     vec->length = length;

  1437.     vec->coeff  = av_malloc(sizeof(double) * length);

  1438.     if (!vec->coeff)

  1439.         av_freep(&vec);

  1440.     return vec;

  1441. }

  1442. 

  1443. SwsVector *sws_getGaussianVec(double variance, double quality)

  1444. {

  1445.     const int length = (int)(variance * quality + 0.5) | 1;

  1446.     int i;

  1447.     double middle  = (length - 1) * 0.5;

  1448.     SwsVector *vec = sws_allocVec(length);

  1449. 

  1450.     if (!vec)

  1451.         return NULL;

  1452. 

  1453.     for (i = 0; i < length; i++) {

  1454.         double dist = i - middle;

  1455.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1456.                         sqrt(2 * variance * M_PI);

  1457.     }

  1458. 

  1459.     sws_normalizeVec(vec, 1.0);

  1460. 

  1461.     return vec;

  1462. }

  1463. 

  1464. SwsVector *sws_getConstVec(double c, int length)

  1465. {

  1466.     int i;

  1467.     SwsVector *vec = sws_allocVec(length);

  1468. 

  1469.     if (!vec)

  1470.         return NULL;

  1471. 

  1472.     for (i = 0; i < length; i++)

  1473.         vec->coeff[i] = c;

  1474. 

  1475.     return vec;

  1476. }

  1477. 

  1478. SwsVector *sws_getIdentityVec(void)

  1479. {

  1480.     return sws_getConstVec(1.0, 1);

  1481. }

  1482. 

  1483. static double sws_dcVec(SwsVector *a)

  1484. {

  1485.     int i;

  1486.     double sum = 0;

  1487. 

  1488.     for (i = 0; i < a->length; i++)

  1489.         sum += a->coeff[i];

  1490. 

  1491.     return sum;

  1492. }

  1493. 

  1494. void sws_scaleVec(SwsVector *a, double scalar)

  1495. {

  1496.     int i;

  1497. 

  1498.     for (i = 0; i < a->length; i++)

  1499.         a->coeff[i] *= scalar;

  1500. }

  1501. 

  1502. void sws_normalizeVec(SwsVector *a, double height)

  1503. {

  1504.     sws_scaleVec(a, height / sws_dcVec(a));

  1505. }

  1506. 

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

  1508. {

  1509.     int length = a->length + b->length - 1;

  1510.     int i, j;

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

  1512. 

  1513.     if (!vec)

  1514.         return NULL;

  1515. 

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

  1517.         for (j = 0; j < b->length; j++) {

  1518.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1519.         }

  1520.     }

  1521. 

  1522.     return vec;

  1523. }

  1524. 

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

  1543. {

  1544.     int length = FFMAX(a->length, b->length);

  1545.     int i;

  1546.     SwsVector *vec = sws_getConstVec(0.0, length);

  1547. 

  1548.     if (!vec)

  1549.         return NULL;

  1550. 

  1551.     for (i = 0; i < a->length; i++)

  1552.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1553.     for (i = 0; i < b->length; i++)

  1554.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1555. 

  1556.     return vec;

  1557. }

  1558. 

  1559. /* shift left / or right if "shift" is negative */

  1560. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1561. {

  1562.     int length = a->length + FFABS(shift) * 2;

  1563.     int i;

  1564.     SwsVector *vec = sws_getConstVec(0.0, length);

  1565. 

  1566.     if (!vec)

  1567.         return NULL;

  1568. 

  1569.     for (i = 0; i < a->length; i++) {

  1570.         vec->coeff[i + (length    - 1) / 2 -

  1571.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1572.     }

  1573. 

  1574.     return vec;

  1575. }

  1576. 

  1577. void sws_shiftVec(SwsVector *a, int shift)

  1578. {

  1579.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1580.     av_free(a->coeff);

  1581.     a->coeff  = shifted->coeff;

  1582.     a->length = shifted->length;

  1583.     av_free(shifted);

  1584. }

  1585. 

  1586. void sws_addVec(SwsVector *a, SwsVector *b)

  1587. {

  1588.     SwsVector *sum = sws_sumVec(a, b);

  1589.     av_free(a->coeff);

  1590.     a->coeff  = sum->coeff;

  1591.     a->length = sum->length;

  1592.     av_free(sum);

  1593. }

  1594. 

  1595. void sws_subVec(SwsVector *a, SwsVector *b)

  1596. {

  1597.     SwsVector *diff = sws_diffVec(a, b);

  1598.     av_free(a->coeff);

  1599.     a->coeff  = diff->coeff;

  1600.     a->length = diff->length;

  1601.     av_free(diff);

  1602. }

  1603. 

  1604. void sws_convVec(SwsVector *a, SwsVector *b)

  1605. {

  1606.     SwsVector *conv = sws_getConvVec(a, b);

  1607.     av_free(a->coeff);

  1608.     a->coeff  = conv->coeff;

  1609.     a->length = conv->length;

  1610.     av_free(conv);

  1611. }

  1612. 

  1613. SwsVector *sws_cloneVec(SwsVector *a)

  1614. {

  1615.     int i;

  1616.     SwsVector *vec = sws_allocVec(a->length);

  1617. 

  1618.     if (!vec)

  1619.         return NULL;

  1620. 

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

  1622.         vec->coeff[i] = a->coeff[i];

  1623. 

  1624.     return vec;

  1625. }

  1626. 

  1627. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1628. {

  1629.     int i;

  1630.     double max = 0;

  1631.     double min = 0;

  1632.     double range;

  1633. 

  1634.     for (i = 0; i < a->length; i++)

  1635.         if (a->coeff[i] > max)

  1636.             max = a->coeff[i];

  1637. 

  1638.     for (i = 0; i < a->length; i++)

  1639.         if (a->coeff[i] < min)

  1640.             min = a->coeff[i];

  1641. 

  1642.     range = max - min;

  1643. 

  1644.     for (i = 0; i < a->length; i++) {

  1645.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1646.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1647.         for (; x > 0; x--)

  1648.             av_log(log_ctx, log_level, " ");

  1649.         av_log(log_ctx, log_level, "|\n");

  1650.     }

  1651. }

  1652. 

  1653. void sws_freeVec(SwsVector *a)

  1654. {

  1655.     if (!a)

  1656.         return;

  1657.     av_freep(&a->coeff);

  1658.     a->length = 0;

  1659.     av_free(a);

  1660. }

  1661. 

  1662. void sws_freeFilter(SwsFilter *filter)

  1663. {

  1664.     if (!filter)

  1665.         return;

  1666. 

  1667.     if (filter->lumH)

  1668.         sws_freeVec(filter->lumH);

  1669.     if (filter->lumV)

  1670.         sws_freeVec(filter->lumV);

  1671.     if (filter->chrH)

  1672.         sws_freeVec(filter->chrH);

  1673.     if (filter->chrV)

  1674.         sws_freeVec(filter->chrV);

  1675.     av_free(filter);

  1676. }

  1677. 

  1678. void sws_freeContext(SwsContext *c)

  1679. {

  1680.     int i;

  1681.     if (!c)

  1682.         return;

  1683. 

  1684.     if (c->lumPixBuf) {

  1685.         for (i = 0; i < c->vLumBufSize; i++)

  1686.             av_freep(&c->lumPixBuf[i]);

  1687.         av_freep(&c->lumPixBuf);

  1688.     }

  1689. 

  1690.     if (c->chrUPixBuf) {

  1691.         for (i = 0; i < c->vChrBufSize; i++)

  1692.             av_freep(&c->chrUPixBuf[i]);

  1693.         av_freep(&c->chrUPixBuf);

  1694.         av_freep(&c->chrVPixBuf);

  1695.     }

  1696. 

  1697.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1698.         for (i = 0; i < c->vLumBufSize; i++)

  1699.             av_freep(&c->alpPixBuf[i]);

  1700.         av_freep(&c->alpPixBuf);

  1701.     }

  1702. 

  1703.     av_freep(&c->vLumFilter);

  1704.     av_freep(&c->vChrFilter);

  1705.     av_freep(&c->hLumFilter);

  1706.     av_freep(&c->hChrFilter);

  1707. #if HAVE_ALTIVEC

  1708.     av_freep(&c->vYCoeffsBank);

  1709.     av_freep(&c->vCCoeffsBank);

  1710. #endif

  1711. 

  1712.     av_freep(&c->vLumFilterPos);

  1713.     av_freep(&c->vChrFilterPos);

  1714.     av_freep(&c->hLumFilterPos);

  1715.     av_freep(&c->hChrFilterPos);

  1716. 

  1717. #if HAVE_MMX_INLINE

  1718. #if USE_MMAP

  1719.     if (c->lumMmxextFilterCode)

  1720.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1721.     if (c->chrMmxextFilterCode)

  1722.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1723. #elif HAVE_VIRTUALALLOC

  1724.     if (c->lumMmxextFilterCode)

  1725.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1726.     if (c->chrMmxextFilterCode)

  1727.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1728. #else

  1729.     av_free(c->lumMmxextFilterCode);

  1730.     av_free(c->chrMmxextFilterCode);

  1731. #endif

  1732.     c->lumMmxextFilterCode = NULL;

  1733.     c->chrMmxextFilterCode = NULL;

  1734. #endif /* HAVE_MMX_INLINE */

  1735. 

  1736.     av_freep(&c->yuvTable);

  1737.     av_free(c->formatConvBuffer);

  1738. 

  1739.     av_free(c);

  1740. }

  1741. 

  1742. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1743.                                         int srcH, enum AVPixelFormat srcFormat,

  1744.                                         int dstW, int dstH,

  1745.                                         enum AVPixelFormat dstFormat, int flags,

  1746.                                         SwsFilter *srcFilter,

  1747.                                         SwsFilter *dstFilter,

  1748.                                         const double *param)

  1749. {

  1750.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1751.                                              SWS_PARAM_DEFAULT };

  1752. 

  1753.     if (!param)

  1754.         param = default_param;

  1755. 

  1756.     if (context &&

  1757.         (context->srcW      != srcW      ||

  1758.          context->srcH      != srcH      ||

  1759.          context->srcFormat != srcFormat ||

  1760.          context->dstW      != dstW      ||

  1761.          context->dstH      != dstH      ||

  1762.          context->dstFormat != dstFormat ||

  1763.          context->flags     != flags     ||

  1764.          context->param[0]  != param[0]  ||

  1765.          context->param[1]  != param[1])) {

  1766.         sws_freeContext(context);

  1767.         context = NULL;

  1768.     }

  1769. 

  1770.     if (!context) {

  1771.         if (!(context = sws_alloc_context()))

  1772.             return NULL;

  1773.         context->srcW      = srcW;

  1774.         context->srcH      = srcH;

  1775.         context->srcRange  = handle_jpeg(&srcFormat);

  1776.         context->srcFormat = srcFormat;

  1777.         context->dstW      = dstW;

  1778.         context->dstH      = dstH;

  1779.         context->dstRange  = handle_jpeg(&dstFormat);

  1780.         context->dstFormat = dstFormat;

  1781.         context->flags     = flags;

  1782.         context->param[0]  = param[0];

  1783.         context->param[1]  = param[1];

  1784.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1785.                                  context->srcRange,

  1786.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1787.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1788.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1789.             sws_freeContext(context);

  1790.             return NULL;

  1791.         }

  1792.     }

  1793.     return context;

  1794. }