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FFmpeg/libswscale/utils.c

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  1. /*

  2.  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>

  3.  *

  4.  * This file is part of Libav.

  5.  *

  6.  * Libav is free software; you can redistribute it and/or

  7.  * modify it under the terms of the GNU Lesser General Public

  8.  * License as published by the Free Software Foundation; either

  9.  * version 2.1 of the License, or (at your option) any later version.

  10.  *

  11.  * Libav is distributed in the hope that it will be useful,

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  14.  * Lesser General Public License for more details.

  15.  *

  16.  * You should have received a copy of the GNU Lesser General Public

  17.  * License along with Libav; if not, write to the Free Software

  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #include <assert.h>

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

  31. #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avutil.h"

  42. #include "libavutil/bswap.h"

  43. #include "libavutil/cpu.h"

  44. #include "libavutil/intreadwrite.h"

  45. #include "libavutil/mathematics.h"

  46. #include "libavutil/opt.h"

  47. #include "libavutil/pixdesc.h"

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

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

  50. #include "rgb2rgb.h"

  51. #include "swscale.h"

  52. #include "swscale_internal.h"

  53. 

  54. unsigned swscale_version(void)

  55. {

  56.     return LIBSWSCALE_VERSION_INT;

  57. }

  58. 

  59. const char *swscale_configuration(void)

  60. {

  61.     return LIBAV_CONFIGURATION;

  62. }

  63. 

  64. const char *swscale_license(void)

  65. {

  66. #define LICENSE_PREFIX "libswscale license: "

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

  68. }

  69. 

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

  71. 

  72. typedef struct FormatEntry {

  73.     int is_supported_in, is_supported_out;

  74. } FormatEntry;

  75. 

  76. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  166.     [AV_PIX_FMT_GBRP]        = { 1, 0 },

  167.     [AV_PIX_FMT_GBRP9LE]     = { 1, 0 },

  168.     [AV_PIX_FMT_GBRP9BE]     = { 1, 0 },

  169.     [AV_PIX_FMT_GBRP10LE]    = { 1, 0 },

  170.     [AV_PIX_FMT_GBRP10BE]    = { 1, 0 },

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

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

  173. };

  174. 

  175. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  176. {

  177.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  178.            format_entries[pix_fmt].is_supported_in : 0;

  179. }

  180. 

  181. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  182. {

  183.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  184.            format_entries[pix_fmt].is_supported_out : 0;

  185. }

  186. 

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

  188. 

  189. const char *sws_format_name(enum AVPixelFormat format)

  190. {

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

  192.     if (desc)

  193.         return desc->name;

  194.     else

  195.         return "Unknown format";

  196. }

  197. 

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

  199.                              double dist)

  200. {

  201.     if (dist <= 1.0)

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

  203.     else

  204.         return getSplineCoeff(0.0,

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

  206.                                c + 3.0 * d,

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

  208.                               dist - 1.0);

  209. }

  210. 

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

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

  213.                       int filterAlign, int one, int flags, int cpu_flags,

  214.                       SwsVector *srcFilter, SwsVector *dstFilter,

  215.                       double param[2], int is_horizontal)

  216. {

  217.     int i;

  218.     int filterSize;

  219.     int filter2Size;

  220.     int minFilterSize;

  221.     int64_t *filter    = NULL;

  222.     int64_t *filter2   = NULL;

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

  224.     int ret            = -1;

  225. 

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

  227. 

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

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

  230. 

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

  232.         int i;

  233.         filterSize = 1;

  234.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  236. 

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

  238.             filter[i * filterSize] = fone;

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

  240.         }

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

  242.         int i;

  243.         int xDstInSrc;

  244.         filterSize = 1;

  245.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  247. 

  248.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  251. 

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

  253.             filter[i]       = fone;

  254.             xDstInSrc      += xInc;

  255.         }

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

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

  258.         int i;

  259.         int xDstInSrc;

  260.         filterSize = 2;

  261.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  263. 

  264.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  267.             int j;

  268. 

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

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

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

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

  273.                                 (fone >> 16);

  274.                 if (coeff < 0)

  275.                     coeff = 0;

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

  277.                 xx++;

  278.             }

  279.             xDstInSrc += xInc;

  280.         }

  281.     } else {

  282.         int64_t xDstInSrc;

  283.         int sizeFactor;

  284. 

  285.         if (flags & SWS_BICUBIC)

  286.             sizeFactor = 4;

  287.         else if (flags & SWS_X)

  288.             sizeFactor = 8;

  289.         else if (flags & SWS_AREA)

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

  291.         else if (flags & SWS_GAUSS)

  292.             sizeFactor = 8;     // infinite ;)

  293.         else if (flags & SWS_LANCZOS)

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

  295.         else if (flags & SWS_SINC)

  296.             sizeFactor = 20;    // infinite ;)

  297.         else if (flags & SWS_SPLINE)

  298.             sizeFactor = 20;    // infinite ;)

  299.         else if (flags & SWS_BILINEAR)

  300.             sizeFactor = 2;

  301.         else {

  302.             sizeFactor = 0;     // GCC warning killer

  303.             assert(0);

  304.         }

  305. 

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

  307.             filterSize = 1 + sizeFactor;    // upscale

  308.         else

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

  310. 

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

  312.         filterSize = FFMAX(filterSize, 1);

  313. 

  314.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  316. 

  317.         xDstInSrc = xInc - 0x10000;

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

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

  320.             int j;

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

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

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

  324.                 double floatd;

  325.                 int64_t coeff;

  326. 

  327.                 if (xInc > 1 << 16)

  328.                     d = d * dstW / srcW;

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

  330. 

  331.                 if (flags & SWS_BICUBIC) {

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

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

  334. 

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

  336.                         coeff = 0.0;

  337.                     } else {

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

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

  340. 

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

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

  343.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  344.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  345.                         else

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

  347.                                       (6 * B + 30 * C) * dd  +

  348.                                     (-12 * B - 48 * C) * d   +

  349.                                       (8 * B + 24 * C) * (1 << 30);

  350.                     }

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

  352.                 }

  353. #if 0

  354.                 else if (flags & SWS_X) {

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

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

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

  358.                 }

  359. #endif

  360.                 else if (flags & SWS_X) {

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

  362.                     double c;

  363. 

  364.                     if (floatd < 1.0)

  365.                         c = cos(floatd * M_PI);

  366.                     else

  367.                         c = -1.0;

  368.                     if (c < 0.0)

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

  370.                     else

  371.                         c = pow(c, A);

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

  373.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  379.                     else

  380.                         coeff = 0.0;

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

  382.                 } else if (flags & SWS_GAUSS) {

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

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

  385.                 } else if (flags & SWS_SINC) {

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

  387.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  391.                     if (floatd > p)

  392.                         coeff = 0;

  393.                 } else if (flags & SWS_BILINEAR) {

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

  395.                     if (coeff < 0)

  396.                         coeff = 0;

  397.                     coeff *= fone >> 30;

  398.                 } else if (flags & SWS_SPLINE) {

  399.                     double p = -2.196152422706632;

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

  401.                 } else {

  402.                     coeff = 0.0; // GCC warning killer

  403.                     assert(0);

  404.                 }

  405. 

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

  407.                 xx++;

  408.             }

  409.             xDstInSrc += 2 * xInc;

  410.         }

  411.     }

  412. 

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

  414.      * av_free(filter);

  415.      */

  416.     assert(filterSize > 0);

  417.     filter2Size = filterSize;

  418.     if (srcFilter)

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

  420.     if (dstFilter)

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

  422.     assert(filter2Size > 0);

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

  424. 

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

  426.         int j, k;

  427. 

  428.         if (srcFilter) {

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

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

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

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

  433.             }

  434.         } else {

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

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

  437.         }

  438.         // FIXME dstFilter

  439. 

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

  441.     }

  442.     av_freep(&filter);

  443. 

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

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

  446.     minFilterSize = 0;

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

  448.         int min = filter2Size;

  449.         int j;

  450.         int64_t cutOff = 0.0;

  451. 

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

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

  454.             int k;

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

  456. 

  457.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  458.                 break;

  459. 

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

  461.              * filter otherwise */

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

  463.                 break;

  464. 

  465.             // move filter coefficients left

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

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

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

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

  470.         }

  471. 

  472.         cutOff = 0;

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

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

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

  476. 

  477.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  478.                 break;

  479.             min--;

  480.         }

  481. 

  482.         if (min > minFilterSize)

  483.             minFilterSize = min;

  484.     }

  485. 

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

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

  488.         if (minFilterSize < 5)

  489.             filterAlign = 4;

  490. 

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

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

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

  494.         if (minFilterSize < 3)

  495.             filterAlign = 1;

  496.     }

  497. 

  498.     if (INLINE_MMX(cpu_flags)) {

  499.         // special case for unscaled vertical filtering

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

  501.             filterAlign = 1;

  502.     }

  503. 

  504.     assert(minFilterSize > 0);

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

  506.     assert(filterSize > 0);

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

  508.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  510.         goto fail;

  511.     *outFilterSize = filterSize;

  512. 

  513.     if (flags & SWS_PRINT_INFO)

  514.         av_log(NULL, AV_LOG_VERBOSE,

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

  516.                filter2Size, filterSize);

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

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

  519.         int j;

  520. 

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

  522.             if (j >= filter2Size)

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

  524.             else

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

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

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

  528.         }

  529.     }

  530. 

  531.     // FIXME try to align filterPos if possible

  532. 

  533.     // fix borders

  534.     if (is_horizontal) {

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

  536.             int j;

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

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

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

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

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

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

  543.                 }

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

  545.             }

  546. 

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

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

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

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

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

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

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

  554.                 }

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

  556.             }

  557.         }

  558.     }

  559. 

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

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

  562.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  564. 

  565.     /* normalize & store in outFilter */

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

  567.         int j;

  568.         int64_t error = 0;

  569.         int64_t sum   = 0;

  570. 

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

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

  573.         }

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

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

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

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

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

  579.             error                                  = v - intV * sum;

  580.         }

  581.     }

  582. 

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

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

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

  586.                                                       * read over the end */

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

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

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

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

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

  592.     }

  593. 

  594.     ret = 0;

  595. 

  596. fail:

  597.     av_free(filter);

  598.     av_free(filter2);

  599.     return ret;

  600. }

  601. 

  602. #if HAVE_MMXEXT_INLINE

  603. static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode,

  604.                            int16_t *filter, int32_t *filterPos, int numSplits)

  605. {

  606.     uint8_t *fragmentA;

  607.     x86_reg imm8OfPShufW1A;

  608.     x86_reg imm8OfPShufW2A;

  609.     x86_reg fragmentLengthA;

  610.     uint8_t *fragmentB;

  611.     x86_reg imm8OfPShufW1B;

  612.     x86_reg imm8OfPShufW2B;

  613.     x86_reg fragmentLengthB;

  614.     int fragmentPos;

  615. 

  616.     int xpos, i;

  617. 

  618.     // create an optimized horizontal scaling routine

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

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

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

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

  623.      */

  624. 

  625.     // code fragment

  626. 

  627.     __asm__ volatile (

  628.         "jmp                         9f                 \n\t"

  629.         // Begin

  630.         "0:                                             \n\t"

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

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

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

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

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

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

  637.         "1:                                             \n\t"

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

  639.         "2:                                             \n\t"

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

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

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

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

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

  645. 

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

  647. 

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

  649.         // End

  650.         "9:                                             \n\t"

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

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

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

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

  655.         "dec                         %1                 \n\t"

  656.         "dec                         %2                 \n\t"

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

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

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

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

  661. 

  662. 

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

  664.           "=r" (fragmentLengthA)

  665.         );

  666. 

  667.     __asm__ volatile (

  668.         "jmp                         9f                 \n\t"

  669.         // Begin

  670.         "0:                                             \n\t"

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

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

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

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

  675.         "1:                                             \n\t"

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

  677.         "2:                                             \n\t"

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

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

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

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

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

  683. 

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

  685. 

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

  687.         // End

  688.         "9:                                             \n\t"

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

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

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

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

  693.         "dec                         %1                 \n\t"

  694.         "dec                         %2                 \n\t"

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

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

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

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

  699. 

  700. 

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

  702.           "=r" (fragmentLengthB)

  703.         );

  704. 

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

  706.     fragmentPos = 0;

  707. 

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

  709.         int xx = xpos >> 16;

  710. 

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

  712.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  722.             int shift              = 0;

  723. 

  724.             if (filterCode) {

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

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

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

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

  729.                 filterPos[i / 2] = xx;

  730. 

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

  732. 

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

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

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

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

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

  738.                                                                (c << 4) |

  739.                                                                (d << 6);

  740. 

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

  742.                     shift = maxShift;               // avoid overread

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

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

  745. 

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

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

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

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

  750.                 }

  751.             }

  752. 

  753.             fragmentPos += fragmentLength;

  754. 

  755.             if (filterCode)

  756.                 filterCode[fragmentPos] = RET;

  757.         }

  758.         xpos += xInc;

  759.     }

  760.     if (filterCode)

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

  762. 

  763.     return fragmentPos + 1;

  764. }

  765. #endif /* HAVE_MMXEXT_INLINE */

  766. 

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

  768. {

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

  770.     *h = desc->log2_chroma_w;

  771.     *v = desc->log2_chroma_h;

  772. }

  773. 

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

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

  776.                              int brightness, int contrast, int saturation)

  777. {

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

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

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

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

  782. 

  783.     c->brightness = brightness;

  784.     c->contrast   = contrast;

  785.     c->saturation = saturation;

  786.     c->srcRange   = srcRange;

  787.     c->dstRange   = dstRange;

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

  789.         return -1;

  790. 

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

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

  793. 

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

  795.                              contrast, saturation);

  796.     // FIXME factorize

  797. 

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

  799.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  800.                                        contrast, saturation);

  801.     return 0;

  802. }

  803. 

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

  805.                              int *srcRange, int **table, int *dstRange,

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

  807. {

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

  809.         return -1;

  810. 

  811.     *inv_table  = c->srcColorspaceTable;

  812.     *table      = c->dstColorspaceTable;

  813.     *srcRange   = c->srcRange;

  814.     *dstRange   = c->dstRange;

  815.     *brightness = c->brightness;

  816.     *contrast   = c->contrast;

  817.     *saturation = c->saturation;

  818. 

  819.     return 0;

  820. }

  821. 

  822. static int handle_jpeg(enum AVPixelFormat *format)

  823. {

  824.     switch (*format) {

  825.     case AV_PIX_FMT_YUVJ420P:

  826.         *format = AV_PIX_FMT_YUV420P;

  827.         return 1;

  828.     case AV_PIX_FMT_YUVJ422P:

  829.         *format = AV_PIX_FMT_YUV422P;

  830.         return 1;

  831.     case AV_PIX_FMT_YUVJ444P:

  832.         *format = AV_PIX_FMT_YUV444P;

  833.         return 1;

  834.     case AV_PIX_FMT_YUVJ440P:

  835.         *format = AV_PIX_FMT_YUV440P;

  836.         return 1;

  837.     default:

  838.         return 0;

  839.     }

  840. }

  841. 

  842. SwsContext *sws_alloc_context(void)

  843. {

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

  845. 

  846.     c->av_class = &sws_context_class;

  847.     av_opt_set_defaults(c);

  848. 

  849.     return c;

  850. }

  851. 

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

  853.                              SwsFilter *dstFilter)

  854. {

  855.     int i;

  856.     int usesVFilter, usesHFilter;

  857.     int unscaled;

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

  859.     int srcW              = c->srcW;

  860.     int srcH              = c->srcH;

  861.     int dstW              = c->dstW;

  862.     int dstH              = c->dstH;

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

  864.     int dst_stride_px     = dst_stride >> 1;

  865.     int flags, cpu_flags;

  866.     enum AVPixelFormat srcFormat = c->srcFormat;

  867.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  870. 

  871.     cpu_flags = av_get_cpu_flags();

  872.     flags     = c->flags;

  873.     emms_c();

  874.     if (!rgb15to16)

  875.         sws_rgb2rgb_init();

  876. 

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

  878. 

  879.     if (!sws_isSupportedInput(srcFormat)) {

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

  881.                sws_format_name(srcFormat));

  882.         return AVERROR(EINVAL);

  883.     }

  884.     if (!sws_isSupportedOutput(dstFormat)) {

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

  886.                sws_format_name(dstFormat));

  887.         return AVERROR(EINVAL);

  888.     }

  889. 

  890.     i = flags & (SWS_POINT         |

  891.                  SWS_AREA          |

  892.                  SWS_BILINEAR      |

  893.                  SWS_FAST_BILINEAR |

  894.                  SWS_BICUBIC       |

  895.                  SWS_X             |

  896.                  SWS_GAUSS         |

  897.                  SWS_LANCZOS       |

  898.                  SWS_SINC          |

  899.                  SWS_SPLINE        |

  900.                  SWS_BICUBLIN);

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

  902.         av_log(c, AV_LOG_ERROR,

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

  904.         return AVERROR(EINVAL);

  905.     }

  906.     /* sanity check */

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

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

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

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

  911.                srcW, srcH, dstW, dstH);

  912.         return AVERROR(EINVAL);

  913.     }

  914. 

  915.     if (!dstFilter)

  916.         dstFilter = &dummyFilter;

  917.     if (!srcFilter)

  918.         srcFilter = &dummyFilter;

  919. 

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

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

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

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

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

  925. 

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

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

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

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

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

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

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

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

  934. 

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

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

  937. 

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

  939.      * chroma interpolation */

  940.     if (flags & SWS_FULL_CHR_H_INT &&

  941.         isAnyRGB(dstFormat)        &&

  942.         dstFormat != AV_PIX_FMT_RGBA  &&

  943.         dstFormat != AV_PIX_FMT_ARGB  &&

  944.         dstFormat != AV_PIX_FMT_BGRA  &&

  945.         dstFormat != AV_PIX_FMT_ABGR  &&

  946.         dstFormat != AV_PIX_FMT_RGB24 &&

  947.         dstFormat != AV_PIX_FMT_BGR24) {

  948.         av_log(c, AV_LOG_ERROR,

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

  950.                sws_format_name(dstFormat));

  951.         flags   &= ~SWS_FULL_CHR_H_INT;

  952.         c->flags = flags;

  953.     }

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

  955.         c->chrDstHSubSample = 1;

  956. 

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

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

  959.                            SWS_SRC_V_CHR_DROP_SHIFT;

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

  961. 

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

  963.      * wants full chroma */

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

  965.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  966.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  967.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

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

  969.          (flags & SWS_FAST_BILINEAR)))

  970.         c->chrSrcHSubSample = 1;

  971. 

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

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

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

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

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

  977. 

  978.     /* unscaled special cases */

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

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

  981.         ff_get_unscaled_swscale(c);

  982. 

  983.         if (c->swScale) {

  984.             if (flags & SWS_PRINT_INFO)

  985.                 av_log(c, AV_LOG_INFO,

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

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

  988.             return 0;

  989.         }

  990.     }

  991. 

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

  993.     if (c->srcBpc < 8)

  994.         c->srcBpc = 8;

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

  996.     if (c->dstBpc < 8)

  997.         c->dstBpc = 8;

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

  999.         dst_stride <<= 1;

  1000.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1001.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1002.                      fail);

  1003.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

  1004.         c->canMMX2BeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1005.                             (srcW & 15) == 0) ? 1 : 0;

  1006.         if (!c->canMMX2BeUsed && dstW >= srcW && (srcW & 15) == 0

  1007.             && (flags & SWS_FAST_BILINEAR)) {

  1008.             if (flags & SWS_PRINT_INFO)

  1009.                 av_log(c, AV_LOG_INFO,

  1010.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1011.         }

  1012.         if (usesHFilter)

  1013.             c->canMMX2BeUsed = 0;

  1014.     } else

  1015.         c->canMMX2BeUsed = 0;

  1016. 

  1017.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1018.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1019. 

  1020.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1021.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1022.      * correct scaling.

  1023.      * n-2 is the last chrominance sample available.

  1024.      * This is not perfect, but no one should notice the difference, the more

  1025.      * correct variant would be like the vertical one, but that would require

  1026.      * some special code for the first and last pixel */

  1027.     if (flags & SWS_FAST_BILINEAR) {

  1028.         if (c->canMMX2BeUsed) {

  1029.             c->lumXInc += 20;

  1030.             c->chrXInc += 20;

  1031.         }

  1032.         // we don't use the x86 asm scaler if MMX is available

  1033.         else if (INLINE_MMX(cpu_flags)) {

  1034.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1035.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1036.         }

  1037.     }

  1038. 

  1039. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1040. 

  1041.     /* precalculate horizontal scaler filter coefficients */

  1042.     {

  1043. #if HAVE_MMXEXT_INLINE

  1044. // can't downscale !!!

  1045.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1046.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1047.                                                        NULL, NULL, 8);

  1048.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1049.                                                        NULL, NULL, NULL, 4);

  1050. 

  1051. #if USE_MMAP

  1052.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1053.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1054. #elif HAVE_VIRTUALALLOC

  1055.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1056.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1057. #else

  1058.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1059.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1060. #endif

  1061. 

  1062.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1063.                 return AVERROR(ENOMEM);

  1064.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1065.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1066.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1067.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1068. 

  1069.             initMMX2HScaler(dstW, c->lumXInc, c->lumMmx2FilterCode,

  1070.                             c->hLumFilter, c->hLumFilterPos, 8);

  1071.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1072.                             c->hChrFilter, c->hChrFilterPos, 4);

  1073. 

  1074. #if USE_MMAP

  1075.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1076.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1077. #endif

  1078.         } else

  1079. #endif /* HAVE_MMXEXT_INLINE */

  1080.         {

  1081.             const int filterAlign =

  1082.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1083.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1084.                 1;

  1085. 

  1086.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1087.                            &c->hLumFilterSize, c->lumXInc,

  1088.                            srcW, dstW, filterAlign, 1 << 14,

  1089.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1090.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1091.                            c->param, 1) < 0)

  1092.                 goto fail;

  1093.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1094.                            &c->hChrFilterSize, c->chrXInc,

  1095.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1096.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1097.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1098.                            c->param, 1) < 0)

  1099.                 goto fail;

  1100.         }

  1101.     } // initialize horizontal stuff

  1102. 

  1103.     /* precalculate vertical scaler filter coefficients */

  1104.     {

  1105.         const int filterAlign =

  1106.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1107.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1108.             1;

  1109. 

  1110.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1111.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1112.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1113.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1114.                        c->param, 0) < 0)

  1115.             goto fail;

  1116.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1117.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1118.                        filterAlign, (1 << 12),

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

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

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

  1122.             goto fail;

  1123. 

  1124. #if HAVE_ALTIVEC

  1125.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1126.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1127. 

  1128.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1129.             int j;

  1130.             short *p = (short *)&c->vYCoeffsBank[i];

  1131.             for (j = 0; j < 8; j++)

  1132.                 p[j] = c->vLumFilter[i];

  1133.         }

  1134. 

  1135.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1136.             int j;

  1137.             short *p = (short *)&c->vCCoeffsBank[i];

  1138.             for (j = 0; j < 8; j++)

  1139.                 p[j] = c->vChrFilter[i];

  1140.         }

  1141. #endif

  1142.     }

  1143. 

  1144.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1145.     c->vLumBufSize = c->vLumFilterSize;

  1146.     c->vChrBufSize = c->vChrFilterSize;

  1147.     for (i = 0; i < dstH; i++) {

  1148.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1149.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1150.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1151.                                << c->chrSrcVSubSample));

  1152. 

  1153.         nextSlice >>= c->chrSrcVSubSample;

  1154.         nextSlice <<= c->chrSrcVSubSample;

  1155.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1156.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1157.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1158.             (nextSlice >> c->chrSrcVSubSample))

  1159.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1160.                              c->vChrFilterPos[chrI];

  1161.     }

  1162. 

  1163.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1164.      * need to allocate several megabytes to handle all possible cases) */

  1165.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1166.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1167.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1168.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1169.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1170.     /* Note we need at least one pixel more at the end because of the MMX code

  1171.      * (just in case someone wants to replace the 4000/8000). */

  1172.     /* align at 16 bytes for AltiVec */

  1173.     for (i = 0; i < c->vLumBufSize; i++) {

  1174.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1175.                           dst_stride + 16, fail);

  1176.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1177.     }

  1178.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1179.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1180.     c->uv_off_byte = dst_stride + 16;

  1181.     for (i = 0; i < c->vChrBufSize; i++) {

  1182.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1183.                          dst_stride * 2 + 32, fail);

  1184.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1185.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1186.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1187.     }

  1188.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1189.         for (i = 0; i < c->vLumBufSize; i++) {

  1190.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1191.                               dst_stride + 16, fail);

  1192.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1193.         }

  1194. 

  1195.     // try to avoid drawing green stuff between the right end and the stride end

  1196.     for (i = 0; i < c->vChrBufSize; i++)

  1197.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1198. 

  1199.     assert(c->chrDstH <= dstH);

  1200. 

  1201.     if (flags & SWS_PRINT_INFO) {

  1202.         if (flags & SWS_FAST_BILINEAR)

  1203.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1204.         else if (flags & SWS_BILINEAR)

  1205.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1206.         else if (flags & SWS_BICUBIC)

  1207.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1208.         else if (flags & SWS_X)

  1209.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1210.         else if (flags & SWS_POINT)

  1211.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1212.         else if (flags & SWS_AREA)

  1213.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1214.         else if (flags & SWS_BICUBLIN)

  1215.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1216.         else if (flags & SWS_GAUSS)

  1217.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1218.         else if (flags & SWS_SINC)

  1219.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1220.         else if (flags & SWS_LANCZOS)

  1221.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1222.         else if (flags & SWS_SPLINE)

  1223.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1224.         else

  1225.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1226. 

  1227.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1228.                sws_format_name(srcFormat),

  1229. #ifdef DITHER1XBPP

  1230.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1231.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1232.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1233.                                                              "dithered " : "",

  1234. #else

  1235.                "",

  1236. #endif

  1237.                sws_format_name(dstFormat));

  1238. 

  1239.         if (INLINE_MMXEXT(cpu_flags))

  1240.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1241.         else if (INLINE_AMD3DNOW(cpu_flags))

  1242.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1243.         else if (INLINE_MMX(cpu_flags))

  1244.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1245.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1246.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1247.         else

  1248.             av_log(c, AV_LOG_INFO, "using C\n");

  1249. 

  1250.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1251.         av_log(c, AV_LOG_DEBUG,

  1252.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1253.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1254.         av_log(c, AV_LOG_DEBUG,

  1255.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1256.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1257.                c->chrXInc, c->chrYInc);

  1258.     }

  1259. 

  1260.     c->swScale = ff_getSwsFunc(c);

  1261.     return 0;

  1262. fail: // FIXME replace things by appropriate error codes

  1263.     return -1;

  1264. }

  1265. 

  1266. #if FF_API_SWS_GETCONTEXT

  1267. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1268.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1269.                            int flags, SwsFilter *srcFilter,

  1270.                            SwsFilter *dstFilter, const double *param)

  1271. {

  1272.     SwsContext *c;

  1273. 

  1274.     if (!(c = sws_alloc_context()))

  1275.         return NULL;

  1276. 

  1277.     c->flags     = flags;

  1278.     c->srcW      = srcW;

  1279.     c->srcH      = srcH;

  1280.     c->dstW      = dstW;

  1281.     c->dstH      = dstH;

  1282.     c->srcRange  = handle_jpeg(&srcFormat);

  1283.     c->dstRange  = handle_jpeg(&dstFormat);

  1284.     c->srcFormat = srcFormat;

  1285.     c->dstFormat = dstFormat;

  1286. 

  1287.     if (param) {

  1288.         c->param[0] = param[0];

  1289.         c->param[1] = param[1];

  1290.     }

  1291.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1292.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1293.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1294. 

  1295.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1296.         sws_freeContext(c);

  1297.         return NULL;

  1298.     }

  1299. 

  1300.     return c;

  1301. }

  1302. #endif

  1303. 

  1304. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1305.                                 float lumaSharpen, float chromaSharpen,

  1306.                                 float chromaHShift, float chromaVShift,

  1307.                                 int verbose)

  1308. {

  1309.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1310.     if (!filter)

  1311.         return NULL;

  1312. 

  1313.     if (lumaGBlur != 0.0) {

  1314.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1315.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1316.     } else {

  1317.         filter->lumH = sws_getIdentityVec();

  1318.         filter->lumV = sws_getIdentityVec();

  1319.     }

  1320. 

  1321.     if (chromaGBlur != 0.0) {

  1322.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1323.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1324.     } else {

  1325.         filter->chrH = sws_getIdentityVec();

  1326.         filter->chrV = sws_getIdentityVec();

  1327.     }

  1328. 

  1329.     if (chromaSharpen != 0.0) {

  1330.         SwsVector *id = sws_getIdentityVec();

  1331.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1332.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1333.         sws_addVec(filter->chrH, id);

  1334.         sws_addVec(filter->chrV, id);

  1335.         sws_freeVec(id);

  1336.     }

  1337. 

  1338.     if (lumaSharpen != 0.0) {

  1339.         SwsVector *id = sws_getIdentityVec();

  1340.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1341.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1342.         sws_addVec(filter->lumH, id);

  1343.         sws_addVec(filter->lumV, id);

  1344.         sws_freeVec(id);

  1345.     }

  1346. 

  1347.     if (chromaHShift != 0.0)

  1348.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1349. 

  1350.     if (chromaVShift != 0.0)

  1351.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1352. 

  1353.     sws_normalizeVec(filter->chrH, 1.0);

  1354.     sws_normalizeVec(filter->chrV, 1.0);

  1355.     sws_normalizeVec(filter->lumH, 1.0);

  1356.     sws_normalizeVec(filter->lumV, 1.0);

  1357. 

  1358.     if (verbose)

  1359.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1360.     if (verbose)

  1361.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1362. 

  1363.     return filter;

  1364. }

  1365. 

  1366. SwsVector *sws_allocVec(int length)

  1367. {

  1368.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1369.     if (!vec)

  1370.         return NULL;

  1371.     vec->length = length;

  1372.     vec->coeff  = av_malloc(sizeof(double) * length);

  1373.     if (!vec->coeff)

  1374.         av_freep(&vec);

  1375.     return vec;

  1376. }

  1377. 

  1378. SwsVector *sws_getGaussianVec(double variance, double quality)

  1379. {

  1380.     const int length = (int)(variance * quality + 0.5) | 1;

  1381.     int i;

  1382.     double middle  = (length - 1) * 0.5;

  1383.     SwsVector *vec = sws_allocVec(length);

  1384. 

  1385.     if (!vec)

  1386.         return NULL;

  1387. 

  1388.     for (i = 0; i < length; i++) {

  1389.         double dist = i - middle;

  1390.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1391.                         sqrt(2 * variance * M_PI);

  1392.     }

  1393. 

  1394.     sws_normalizeVec(vec, 1.0);

  1395. 

  1396.     return vec;

  1397. }

  1398. 

  1399. SwsVector *sws_getConstVec(double c, int length)

  1400. {

  1401.     int i;

  1402.     SwsVector *vec = sws_allocVec(length);

  1403. 

  1404.     if (!vec)

  1405.         return NULL;

  1406. 

  1407.     for (i = 0; i < length; i++)

  1408.         vec->coeff[i] = c;

  1409. 

  1410.     return vec;

  1411. }

  1412. 

  1413. SwsVector *sws_getIdentityVec(void)

  1414. {

  1415.     return sws_getConstVec(1.0, 1);

  1416. }

  1417. 

  1418. static double sws_dcVec(SwsVector *a)

  1419. {

  1420.     int i;

  1421.     double sum = 0;

  1422. 

  1423.     for (i = 0; i < a->length; i++)

  1424.         sum += a->coeff[i];

  1425. 

  1426.     return sum;

  1427. }

  1428. 

  1429. void sws_scaleVec(SwsVector *a, double scalar)

  1430. {

  1431.     int i;

  1432. 

  1433.     for (i = 0; i < a->length; i++)

  1434.         a->coeff[i] *= scalar;

  1435. }

  1436. 

  1437. void sws_normalizeVec(SwsVector *a, double height)

  1438. {

  1439.     sws_scaleVec(a, height / sws_dcVec(a));

  1440. }

  1441. 

  1442. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1443. {

  1444.     int length = a->length + b->length - 1;

  1445.     int i, j;

  1446.     SwsVector *vec = sws_getConstVec(0.0, length);

  1447. 

  1448.     if (!vec)

  1449.         return NULL;

  1450. 

  1451.     for (i = 0; i < a->length; i++) {

  1452.         for (j = 0; j < b->length; j++) {

  1453.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1454.         }

  1455.     }

  1456. 

  1457.     return vec;

  1458. }

  1459. 

  1460. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1461. {

  1462.     int length = FFMAX(a->length, b->length);

  1463.     int i;

  1464.     SwsVector *vec = sws_getConstVec(0.0, length);

  1465. 

  1466.     if (!vec)

  1467.         return NULL;

  1468. 

  1469.     for (i = 0; i < a->length; i++)

  1470.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

  1472.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1473. 

  1474.     return vec;

  1475. }

  1476. 

  1477. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1478. {

  1479.     int length = FFMAX(a->length, b->length);

  1480.     int i;

  1481.     SwsVector *vec = sws_getConstVec(0.0, length);

  1482. 

  1483.     if (!vec)

  1484.         return NULL;

  1485. 

  1486.     for (i = 0; i < a->length; i++)

  1487.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

  1489.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1490. 

  1491.     return vec;

  1492. }

  1493. 

  1494. /* shift left / or right if "shift" is negative */

  1495. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1496. {

  1497.     int length = a->length + FFABS(shift) * 2;

  1498.     int i;

  1499.     SwsVector *vec = sws_getConstVec(0.0, length);

  1500. 

  1501.     if (!vec)

  1502.         return NULL;

  1503. 

  1504.     for (i = 0; i < a->length; i++) {

  1505.         vec->coeff[i + (length    - 1) / 2 -

  1506.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1507.     }

  1508. 

  1509.     return vec;

  1510. }

  1511. 

  1512. void sws_shiftVec(SwsVector *a, int shift)

  1513. {

  1514.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1515.     av_free(a->coeff);

  1516.     a->coeff  = shifted->coeff;

  1517.     a->length = shifted->length;

  1518.     av_free(shifted);

  1519. }

  1520. 

  1521. void sws_addVec(SwsVector *a, SwsVector *b)

  1522. {

  1523.     SwsVector *sum = sws_sumVec(a, b);

  1524.     av_free(a->coeff);

  1525.     a->coeff  = sum->coeff;

  1526.     a->length = sum->length;

  1527.     av_free(sum);

  1528. }

  1529. 

  1530. void sws_subVec(SwsVector *a, SwsVector *b)

  1531. {

  1532.     SwsVector *diff = sws_diffVec(a, b);

  1533.     av_free(a->coeff);

  1534.     a->coeff  = diff->coeff;

  1535.     a->length = diff->length;

  1536.     av_free(diff);

  1537. }

  1538. 

  1539. void sws_convVec(SwsVector *a, SwsVector *b)

  1540. {

  1541.     SwsVector *conv = sws_getConvVec(a, b);

  1542.     av_free(a->coeff);

  1543.     a->coeff  = conv->coeff;

  1544.     a->length = conv->length;

  1545.     av_free(conv);

  1546. }

  1547. 

  1548. SwsVector *sws_cloneVec(SwsVector *a)

  1549. {

  1550.     int i;

  1551.     SwsVector *vec = sws_allocVec(a->length);

  1552. 

  1553.     if (!vec)

  1554.         return NULL;

  1555. 

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

  1557.         vec->coeff[i] = a->coeff[i];

  1558. 

  1559.     return vec;

  1560. }

  1561. 

  1562. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1563. {

  1564.     int i;

  1565.     double max = 0;

  1566.     double min = 0;

  1567.     double range;

  1568. 

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

  1570.         if (a->coeff[i] > max)

  1571.             max = a->coeff[i];

  1572. 

  1573.     for (i = 0; i < a->length; i++)

  1574.         if (a->coeff[i] < min)

  1575.             min = a->coeff[i];

  1576. 

  1577.     range = max - min;

  1578. 

  1579.     for (i = 0; i < a->length; i++) {

  1580.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1581.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1582.         for (; x > 0; x--)

  1583.             av_log(log_ctx, log_level, " ");

  1584.         av_log(log_ctx, log_level, "|\n");

  1585.     }

  1586. }

  1587. 

  1588. void sws_freeVec(SwsVector *a)

  1589. {

  1590.     if (!a)

  1591.         return;

  1592.     av_freep(&a->coeff);

  1593.     a->length = 0;

  1594.     av_free(a);

  1595. }

  1596. 

  1597. void sws_freeFilter(SwsFilter *filter)

  1598. {

  1599.     if (!filter)

  1600.         return;

  1601. 

  1602.     if (filter->lumH)

  1603.         sws_freeVec(filter->lumH);

  1604.     if (filter->lumV)

  1605.         sws_freeVec(filter->lumV);

  1606.     if (filter->chrH)

  1607.         sws_freeVec(filter->chrH);

  1608.     if (filter->chrV)

  1609.         sws_freeVec(filter->chrV);

  1610.     av_free(filter);

  1611. }

  1612. 

  1613. void sws_freeContext(SwsContext *c)

  1614. {

  1615.     int i;

  1616.     if (!c)

  1617.         return;

  1618. 

  1619.     if (c->lumPixBuf) {

  1620.         for (i = 0; i < c->vLumBufSize; i++)

  1621.             av_freep(&c->lumPixBuf[i]);

  1622.         av_freep(&c->lumPixBuf);

  1623.     }

  1624. 

  1625.     if (c->chrUPixBuf) {

  1626.         for (i = 0; i < c->vChrBufSize; i++)

  1627.             av_freep(&c->chrUPixBuf[i]);

  1628.         av_freep(&c->chrUPixBuf);

  1629.         av_freep(&c->chrVPixBuf);

  1630.     }

  1631. 

  1632.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1633.         for (i = 0; i < c->vLumBufSize; i++)

  1634.             av_freep(&c->alpPixBuf[i]);

  1635.         av_freep(&c->alpPixBuf);

  1636.     }

  1637. 

  1638.     av_freep(&c->vLumFilter);

  1639.     av_freep(&c->vChrFilter);

  1640.     av_freep(&c->hLumFilter);

  1641.     av_freep(&c->hChrFilter);

  1642. #if HAVE_ALTIVEC

  1643.     av_freep(&c->vYCoeffsBank);

  1644.     av_freep(&c->vCCoeffsBank);

  1645. #endif

  1646. 

  1647.     av_freep(&c->vLumFilterPos);

  1648.     av_freep(&c->vChrFilterPos);

  1649.     av_freep(&c->hLumFilterPos);

  1650.     av_freep(&c->hChrFilterPos);

  1651. 

  1652. #if HAVE_MMX_INLINE

  1653. #if USE_MMAP

  1654.     if (c->lumMmx2FilterCode)

  1655.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1656.     if (c->chrMmx2FilterCode)

  1657.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1658. #elif HAVE_VIRTUALALLOC

  1659.     if (c->lumMmx2FilterCode)

  1660.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1661.     if (c->chrMmx2FilterCode)

  1662.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1663. #else

  1664.     av_free(c->lumMmx2FilterCode);

  1665.     av_free(c->chrMmx2FilterCode);

  1666. #endif

  1667.     c->lumMmx2FilterCode = NULL;

  1668.     c->chrMmx2FilterCode = NULL;

  1669. #endif /* HAVE_MMX_INLINE */

  1670. 

  1671.     av_freep(&c->yuvTable);

  1672.     av_free(c->formatConvBuffer);

  1673. 

  1674.     av_free(c);

  1675. }

  1676. 

  1677. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1678.                                         int srcH, enum AVPixelFormat srcFormat,

  1679.                                         int dstW, int dstH,

  1680.                                         enum AVPixelFormat dstFormat, int flags,

  1681.                                         SwsFilter *srcFilter,

  1682.                                         SwsFilter *dstFilter,

  1683.                                         const double *param)

  1684. {

  1685.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1686.                                              SWS_PARAM_DEFAULT };

  1687. 

  1688.     if (!param)

  1689.         param = default_param;

  1690. 

  1691.     if (context &&

  1692.         (context->srcW      != srcW      ||

  1693.          context->srcH      != srcH      ||

  1694.          context->srcFormat != srcFormat ||

  1695.          context->dstW      != dstW      ||

  1696.          context->dstH      != dstH      ||

  1697.          context->dstFormat != dstFormat ||

  1698.          context->flags     != flags     ||

  1699.          context->param[0]  != param[0]  ||

  1700.          context->param[1]  != param[1])) {

  1701.         sws_freeContext(context);

  1702.         context = NULL;

  1703.     }

  1704. 

  1705.     if (!context) {

  1706.         if (!(context = sws_alloc_context()))

  1707.             return NULL;

  1708.         context->srcW      = srcW;

  1709.         context->srcH      = srcH;

  1710.         context->srcRange  = handle_jpeg(&srcFormat);

  1711.         context->srcFormat = srcFormat;

  1712.         context->dstW      = dstW;

  1713.         context->dstH      = dstH;

  1714.         context->dstRange  = handle_jpeg(&dstFormat);

  1715.         context->dstFormat = dstFormat;

  1716.         context->flags     = flags;

  1717.         context->param[0]  = param[0];

  1718.         context->param[1]  = param[1];

  1719.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1720.                                  context->srcRange,

  1721.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1722.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1723.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1724.             sws_freeContext(context);

  1725.             return NULL;

  1726.         }

  1727.     }

  1728.     return context;

  1729. }