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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 FFmpeg.

  5.  *

  6.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  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/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.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.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  58.     return LIBSWSCALE_VERSION_INT;

  59. }

  60. 

  61. const char *swscale_configuration(void)

  62. {

  63.     return FFMPEG_CONFIGURATION;

  64. }

  65. 

  66. const char *swscale_license(void)

  67. {

  68. #define LICENSE_PREFIX "libswscale license: "

  69.     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

  70. }

  71. 

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

  73. 

  74. typedef struct FormatEntry {

  75.     int is_supported_in, is_supported_out;

  76. } FormatEntry;

  77. 

  78. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  108.     [AV_PIX_FMT_0RGB]        = { 1, 1 },

  109.     [AV_PIX_FMT_RGB0]        = { 1, 1 },

  110.     [AV_PIX_FMT_0BGR]        = { 1, 1 },

  111.     [AV_PIX_FMT_BGR0]        = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  170.     [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },

  171.     [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },

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

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

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

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

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

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

  178.     [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },

  179.     [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },

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

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

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

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

  184.     [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },

  185.     [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },

  186.     [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },

  187.     [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },

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

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

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

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

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

  193.     [AV_PIX_FMT_GBRP12LE]    = { 1, 0 },

  194.     [AV_PIX_FMT_GBRP12BE]    = { 1, 0 },

  195.     [AV_PIX_FMT_GBRP14LE]    = { 1, 0 },

  196.     [AV_PIX_FMT_GBRP14BE]    = { 1, 0 },

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

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

  199. };

  200. 

  201. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  202. {

  203.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  204.            format_entries[pix_fmt].is_supported_in : 0;

  205. }

  206. 

  207. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  208. {

  209.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  210.            format_entries[pix_fmt].is_supported_out : 0;

  211. }

  212. 

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

  214. 

  215. #if FF_API_SWS_FORMAT_NAME

  216. const char *sws_format_name(enum AVPixelFormat format)

  217. {

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

  219.     if (desc)

  220.         return desc->name;

  221.     else

  222.         return "Unknown format";

  223. }

  224. #endif

  225. 

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

  227.                              double dist)

  228. {

  229.     if (dist <= 1.0)

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

  231.     else

  232.         return getSplineCoeff(0.0,

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

  234.                                c + 3.0 * d,

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

  236.                               dist - 1.0);

  237. }

  238. 

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

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

  241.                       int filterAlign, int one, int flags, int cpu_flags,

  242.                       SwsVector *srcFilter, SwsVector *dstFilter,

  243.                       double param[2])

  244. {

  245.     int i;

  246.     int filterSize;

  247.     int filter2Size;

  248.     int minFilterSize;

  249.     int64_t *filter    = NULL;

  250.     int64_t *filter2   = NULL;

  251.     const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));

  252.     int ret            = -1;

  253. 

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

  255. 

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

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

  258. 

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

  260.         int i;

  261.         filterSize = 1;

  262.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  264. 

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

  266.             filter[i * filterSize] = fone;

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

  268.         }

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

  270.         int i;

  271.         int64_t xDstInSrc;

  272.         filterSize = 1;

  273.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  275. 

  276.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  279. 

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

  281.             filter[i]       = fone;

  282.             xDstInSrc      += xInc;

  283.         }

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

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

  286.         int i;

  287.         int64_t xDstInSrc;

  288.         filterSize = 2;

  289.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  291. 

  292.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  295.             int j;

  296. 

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

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

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

  300.                 int64_t coeff= fone - FFABS(((int64_t)xx<<16) - xDstInSrc)*(fone>>16);

  301.                 if (coeff < 0)

  302.                     coeff = 0;

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

  304.                 xx++;

  305.             }

  306.             xDstInSrc += xInc;

  307.         }

  308.     } else {

  309.         int64_t xDstInSrc;

  310.         int sizeFactor;

  311. 

  312.         if (flags & SWS_BICUBIC)

  313.             sizeFactor = 4;

  314.         else if (flags & SWS_X)

  315.             sizeFactor = 8;

  316.         else if (flags & SWS_AREA)

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

  318.         else if (flags & SWS_GAUSS)

  319.             sizeFactor = 8;     // infinite ;)

  320.         else if (flags & SWS_LANCZOS)

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

  322.         else if (flags & SWS_SINC)

  323.             sizeFactor = 20;    // infinite ;)

  324.         else if (flags & SWS_SPLINE)

  325.             sizeFactor = 20;    // infinite ;)

  326.         else if (flags & SWS_BILINEAR)

  327.             sizeFactor = 2;

  328.         else {

  329.             av_assert0(0);

  330.         }

  331. 

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

  333.             filterSize = 1 + sizeFactor;    // upscale

  334.         else

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

  336. 

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

  338.         filterSize = FFMAX(filterSize, 1);

  339. 

  340.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  342. 

  343.         xDstInSrc = xInc - 0x10000;

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

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

  346.             int j;

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

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

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

  350.                 double floatd;

  351.                 int64_t coeff;

  352. 

  353.                 if (xInc > 1 << 16)

  354.                     d = d * dstW / srcW;

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

  356. 

  357.                 if (flags & SWS_BICUBIC) {

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

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

  360. 

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

  362.                         coeff = 0.0;

  363.                     } else {

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

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

  366. 

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

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

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

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

  371.                         else

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

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

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

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

  376.                     }

  377.                     coeff /= (1LL<<54)/fone;

  378.                 }

  379. #if 0

  380.                 else if (flags & SWS_X) {

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

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

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

  384.                 }

  385. #endif

  386.                 else if (flags & SWS_X) {

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

  388.                     double c;

  389. 

  390.                     if (floatd < 1.0)

  391.                         c = cos(floatd * M_PI);

  392.                     else

  393.                         c = -1.0;

  394.                     if (c < 0.0)

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

  396.                     else

  397.                         c = pow(c, A);

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

  399.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  405.                     else

  406.                         coeff = 0.0;

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

  408.                 } else if (flags & SWS_GAUSS) {

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

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

  411.                 } else if (flags & SWS_SINC) {

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

  413.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  417.                     if (floatd > p)

  418.                         coeff = 0;

  419.                 } else if (flags & SWS_BILINEAR) {

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

  421.                     if (coeff < 0)

  422.                         coeff = 0;

  423.                     coeff *= fone >> 30;

  424.                 } else if (flags & SWS_SPLINE) {

  425.                     double p = -2.196152422706632;

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

  427.                 } else {

  428.                     av_assert0(0);

  429.                 }

  430. 

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

  432.                 xx++;

  433.             }

  434.             xDstInSrc += 2 * xInc;

  435.         }

  436.     }

  437. 

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

  439.      * av_free(filter);

  440.      */

  441.     av_assert0(filterSize > 0);

  442.     filter2Size = filterSize;

  443.     if (srcFilter)

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

  445.     if (dstFilter)

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

  447.     av_assert0(filter2Size > 0);

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

  449. 

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

  451.         int j, k;

  452. 

  453.         if (srcFilter) {

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

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

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

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

  458.             }

  459.         } else {

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

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

  462.         }

  463.         // FIXME dstFilter

  464. 

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

  466.     }

  467.     av_freep(&filter);

  468. 

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

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

  471.     minFilterSize = 0;

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

  473.         int min = filter2Size;

  474.         int j;

  475.         int64_t cutOff = 0.0;

  476. 

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

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

  479.             int k;

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

  481. 

  482.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  483.                 break;

  484. 

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

  486.              * filter otherwise */

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

  488.                 break;

  489. 

  490.             // move filter coefficients left

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

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

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

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

  495.         }

  496. 

  497.         cutOff = 0;

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

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

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

  501. 

  502.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  503.                 break;

  504.             min--;

  505.         }

  506. 

  507.         if (min > minFilterSize)

  508.             minFilterSize = min;

  509.     }

  510. 

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

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

  513.         if (minFilterSize < 5)

  514.             filterAlign = 4;

  515. 

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

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

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

  519.         if (minFilterSize < 3)

  520.             filterAlign = 1;

  521.     }

  522. 

  523.     if (INLINE_MMX(cpu_flags)) {

  524.         // special case for unscaled vertical filtering

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

  526.             filterAlign = 1;

  527.     }

  528. 

  529.     av_assert0(minFilterSize > 0);

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

  531.     av_assert0(filterSize > 0);

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

  533.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  535.         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreem scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);

  536.         goto fail;

  537.     }

  538.     *outFilterSize = filterSize;

  539. 

  540.     if (flags & SWS_PRINT_INFO)

  541.         av_log(NULL, AV_LOG_VERBOSE,

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

  543.                filter2Size, filterSize);

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

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

  546.         int j;

  547. 

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

  549.             if (j >= filter2Size)

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

  551.             else

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

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

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

  555.         }

  556.     }

  557. 

  558.     // FIXME try to align filterPos if possible

  559. 

  560.     // fix borders

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

  562.         int j;

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

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

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

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

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

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

  569.             }

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

  571.         }

  572. 

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

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

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

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

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

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

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

  580.             }

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

  582.         }

  583.     }

  584. 

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

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

  587.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  589. 

  590.     /* normalize & store in outFilter */

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

  592.         int j;

  593.         int64_t error = 0;

  594.         int64_t sum   = 0;

  595. 

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

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

  598.         }

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

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

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

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

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

  604.             error                                  = v - intV * sum;

  605.         }

  606.     }

  607. 

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

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

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

  611.                                                       * read over the end */

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

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

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

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

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

  617.     }

  618. 

  619.     ret = 0;

  620. 

  621. fail:

  622.     if(ret < 0)

  623.         av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");

  624.     av_free(filter);

  625.     av_free(filter2);

  626.     return ret;

  627. }

  628. 

  629. #if HAVE_MMXEXT_INLINE

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

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

  632. {

  633.     uint8_t *fragmentA;

  634.     x86_reg imm8OfPShufW1A;

  635.     x86_reg imm8OfPShufW2A;

  636.     x86_reg fragmentLengthA;

  637.     uint8_t *fragmentB;

  638.     x86_reg imm8OfPShufW1B;

  639.     x86_reg imm8OfPShufW2B;

  640.     x86_reg fragmentLengthB;

  641.     int fragmentPos;

  642. 

  643.     int xpos, i;

  644. 

  645.     // create an optimized horizontal scaling routine

  646.     /* This scaler is made of runtime-generated MMX2 code using specially tuned

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

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

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

  650.      */

  651. 

  652.     // code fragment

  653. 

  654.     __asm__ volatile (

  655.         "jmp                         9f                 \n\t"

  656.         // Begin

  657.         "0:                                             \n\t"

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

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

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

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

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

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

  664.         "1:                                             \n\t"

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

  666.         "2:                                             \n\t"

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

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

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

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

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

  672. 

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

  674. 

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

  676.         // End

  677.         "9:                                             \n\t"

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

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

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

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

  682.         "dec                         %1                 \n\t"

  683.         "dec                         %2                 \n\t"

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

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

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

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

  688. 

  689. 

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

  691.           "=r" (fragmentLengthA)

  692.         );

  693. 

  694.     __asm__ volatile (

  695.         "jmp                         9f                 \n\t"

  696.         // Begin

  697.         "0:                                             \n\t"

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

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

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

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

  702.         "1:                                             \n\t"

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

  704.         "2:                                             \n\t"

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

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

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

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

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

  710. 

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

  712. 

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

  714.         // End

  715.         "9:                                             \n\t"

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

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

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

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

  720.         "dec                         %1                 \n\t"

  721.         "dec                         %2                 \n\t"

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

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

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

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

  726. 

  727. 

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

  729.           "=r" (fragmentLengthB)

  730.         );

  731. 

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

  733.     fragmentPos = 0;

  734. 

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

  736.         int xx = xpos >> 16;

  737. 

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

  739.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  749.             int shift              = 0;

  750. 

  751.             if (filterCode) {

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

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

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

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

  756.                 filterPos[i / 2] = xx;

  757. 

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

  759. 

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

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

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

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

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

  765.                                                                (c << 4) |

  766.                                                                (d << 6);

  767. 

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

  769.                     shift = maxShift;               // avoid overread

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

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

  772. 

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

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

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

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

  777.                 }

  778.             }

  779. 

  780.             fragmentPos += fragmentLength;

  781. 

  782.             if (filterCode)

  783.                 filterCode[fragmentPos] = RET;

  784.         }

  785.         xpos += xInc;

  786.     }

  787.     if (filterCode)

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

  789. 

  790.     return fragmentPos + 1;

  791. }

  792. #endif /* HAVE_MMXEXT_INLINE */

  793. 

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

  795. {

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

  797.     *h = desc->log2_chroma_w;

  798.     *v = desc->log2_chroma_h;

  799. }

  800. 

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

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

  803.                              int brightness, int contrast, int saturation)

  804. {

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

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

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

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

  809. 

  810.     if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))

  811.         dstRange = 0;

  812.     if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))

  813.         srcRange = 0;

  814. 

  815.     c->brightness = brightness;

  816.     c->contrast   = contrast;

  817.     c->saturation = saturation;

  818.     c->srcRange   = srcRange;

  819.     c->dstRange   = dstRange;

  820. 

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

  822.         return -1;

  823. 

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

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

  826. 

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

  828.                              contrast, saturation);

  829.     // FIXME factorize

  830. 

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

  832.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  833.                                        contrast, saturation);

  834.     return 0;

  835. }

  836. 

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

  838.                              int *srcRange, int **table, int *dstRange,

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

  840. {

  841.     if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat))

  842.         return -1;

  843. 

  844.     *inv_table  = c->srcColorspaceTable;

  845.     *table      = c->dstColorspaceTable;

  846.     *srcRange   = c->srcRange;

  847.     *dstRange   = c->dstRange;

  848.     *brightness = c->brightness;

  849.     *contrast   = c->contrast;

  850.     *saturation = c->saturation;

  851. 

  852.     return 0;

  853. }

  854. 

  855. static int handle_jpeg(enum AVPixelFormat *format)

  856. {

  857.     switch (*format) {

  858.     case AV_PIX_FMT_YUVJ420P:

  859.         *format = AV_PIX_FMT_YUV420P;

  860.         return 1;

  861.     case AV_PIX_FMT_YUVJ422P:

  862.         *format = AV_PIX_FMT_YUV422P;

  863.         return 1;

  864.     case AV_PIX_FMT_YUVJ444P:

  865.         *format = AV_PIX_FMT_YUV444P;

  866.         return 1;

  867.     case AV_PIX_FMT_YUVJ440P:

  868.         *format = AV_PIX_FMT_YUV440P;

  869.         return 1;

  870.     default:

  871.         return 0;

  872.     }

  873. }

  874. 

  875. static int handle_0alpha(enum AVPixelFormat *format)

  876. {

  877.     switch (*format) {

  878.     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;

  879.     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;

  880.     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;

  881.     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

  882.     default:                                          return 0;

  883.     }

  884. }

  885. 

  886. SwsContext *sws_alloc_context(void)

  887. {

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

  889. 

  890.     c->av_class = &sws_context_class;

  891.     av_opt_set_defaults(c);

  892. 

  893.     return c;

  894. }

  895. 

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

  897.                              SwsFilter *dstFilter)

  898. {

  899.     int i, j;

  900.     int usesVFilter, usesHFilter;

  901.     int unscaled;

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

  903.     int srcW              = c->srcW;

  904.     int srcH              = c->srcH;

  905.     int dstW              = c->dstW;

  906.     int dstH              = c->dstH;

  907.     int dst_stride        = FFALIGN(dstW * sizeof(int16_t) + 66, 16);

  908.     int flags, cpu_flags;

  909.     enum AVPixelFormat srcFormat = c->srcFormat;

  910.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  913. 

  914.     cpu_flags = av_get_cpu_flags();

  915.     flags     = c->flags;

  916.     emms_c();

  917.     if (!rgb15to16)

  918.         sws_rgb2rgb_init();

  919. 

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

  921. 

  922.     handle_jpeg(&srcFormat);

  923.     handle_jpeg(&dstFormat);

  924.     handle_0alpha(&srcFormat);

  925.     handle_0alpha(&dstFormat);

  926. 

  927.     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){

  928.         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");

  929.         c->srcFormat= srcFormat;

  930.         c->dstFormat= dstFormat;

  931.     }

  932. 

  933.     if (!sws_isSupportedInput(srcFormat)) {

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

  935.                av_get_pix_fmt_name(srcFormat));

  936.         return AVERROR(EINVAL);

  937.     }

  938.     if (!sws_isSupportedOutput(dstFormat)) {

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

  940.                av_get_pix_fmt_name(dstFormat));

  941.         return AVERROR(EINVAL);

  942.     }

  943. 

  944.     i = flags & (SWS_POINT         |

  945.                  SWS_AREA          |

  946.                  SWS_BILINEAR      |

  947.                  SWS_FAST_BILINEAR |

  948.                  SWS_BICUBIC       |

  949.                  SWS_X             |

  950.                  SWS_GAUSS         |

  951.                  SWS_LANCZOS       |

  952.                  SWS_SINC          |

  953.                  SWS_SPLINE        |

  954.                  SWS_BICUBLIN);

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

  956.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen, got %X\n", i);

  957.         return AVERROR(EINVAL);

  958.     }

  959.     /* sanity check */

  960.     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

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

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

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

  964.                srcW, srcH, dstW, dstH);

  965.         return AVERROR(EINVAL);

  966.     }

  967. 

  968.     if (!dstFilter)

  969.         dstFilter = &dummyFilter;

  970.     if (!srcFilter)

  971.         srcFilter = &dummyFilter;

  972. 

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

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

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

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

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

  978. 

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

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

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

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

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

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

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

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

  987. 

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

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

  990. 

  991. 

  992.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {

  993.         if (dstW&1) {

  994.             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");

  995.             flags |= SWS_FULL_CHR_H_INT;

  996.             c->flags = flags;

  997.         }

  998.     }

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

  1000.      * chroma interpolation */

  1001.     if (flags & SWS_FULL_CHR_H_INT &&

  1002.         isAnyRGB(dstFormat)        &&

  1003.         dstFormat != AV_PIX_FMT_RGBA  &&

  1004.         dstFormat != AV_PIX_FMT_ARGB  &&

  1005.         dstFormat != AV_PIX_FMT_BGRA  &&

  1006.         dstFormat != AV_PIX_FMT_ABGR  &&

  1007.         dstFormat != AV_PIX_FMT_RGB24 &&

  1008.         dstFormat != AV_PIX_FMT_BGR24) {

  1009.         av_log(c, AV_LOG_WARNING,

  1010.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1011.                av_get_pix_fmt_name(dstFormat));

  1012.         flags   &= ~SWS_FULL_CHR_H_INT;

  1013.         c->flags = flags;

  1014.     }

  1015.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1016.         c->chrDstHSubSample = 1;

  1017. 

  1018.     // drop some chroma lines if the user wants it

  1019.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1020.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1021.     c->chrSrcVSubSample += c->vChrDrop;

  1022. 

  1023.     /* drop every other pixel for chroma calculation unless user

  1024.      * wants full chroma */

  1025.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1026.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1027.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1028.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1029.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1030.          (flags & SWS_FAST_BILINEAR)))

  1031.         c->chrSrcHSubSample = 1;

  1032. 

  1033.     // Note the -((-x)>>y) is so that we always round toward +inf.

  1034.     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);

  1035.     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);

  1036.     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);

  1037.     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

  1038. 

  1039.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1040. 

  1041.     /* unscaled special cases */

  1042.     if (unscaled && !usesHFilter && !usesVFilter &&

  1043.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1044.         ff_get_unscaled_swscale(c);

  1045. 

  1046.         if (c->swScale) {

  1047.             if (flags & SWS_PRINT_INFO)

  1048.                 av_log(c, AV_LOG_INFO,

  1049.                        "using unscaled %s -> %s special converter\n",

  1050.                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

  1051.             return 0;

  1052.         }

  1053.     }

  1054. 

  1055.     c->srcBpc = 1 + desc_src->comp[0].depth_minus1;

  1056.     if (c->srcBpc < 8)

  1057.         c->srcBpc = 8;

  1058.     c->dstBpc = 1 + desc_dst->comp[0].depth_minus1;

  1059.     if (c->dstBpc < 8)

  1060.         c->dstBpc = 8;

  1061.     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

  1062.         c->srcBpc = 16;

  1063.     if (c->dstBpc == 16)

  1064.         dst_stride <<= 1;

  1065.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

  1066.         c->canMMX2BeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1067.                             (srcW & 15) == 0) ? 1 : 0;

  1068.         if (!c->canMMX2BeUsed && dstW >= srcW && (srcW & 15) == 0

  1069.             && (flags & SWS_FAST_BILINEAR)) {

  1070.             if (flags & SWS_PRINT_INFO)

  1071.                 av_log(c, AV_LOG_INFO,

  1072.                        "output width is not a multiple of 32 -> no MMX2 scaler\n");

  1073.         }

  1074.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1075.             c->canMMX2BeUsed=0;

  1076.     } else

  1077.         c->canMMX2BeUsed = 0;

  1078. 

  1079.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1080.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1081. 

  1082.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1083.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1084.      * correct scaling.

  1085.      * n-2 is the last chrominance sample available.

  1086.      * This is not perfect, but no one should notice the difference, the more

  1087.      * correct variant would be like the vertical one, but that would require

  1088.      * some special code for the first and last pixel */

  1089.     if (flags & SWS_FAST_BILINEAR) {

  1090.         if (c->canMMX2BeUsed) {

  1091.             c->lumXInc += 20;

  1092.             c->chrXInc += 20;

  1093.         }

  1094.         // we don't use the x86 asm scaler if MMX is available

  1095.         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

  1096.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1097.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1098.         }

  1099.     }

  1100. 

  1101. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1102. 

  1103.     /* precalculate horizontal scaler filter coefficients */

  1104.     {

  1105. #if HAVE_MMXEXT_INLINE

  1106. // can't downscale !!!

  1107.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1108.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1109.                                                        NULL, NULL, 8);

  1110.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1111.                                                        NULL, NULL, NULL, 4);

  1112. 

  1113. #if USE_MMAP

  1114.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1115.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1116. #elif HAVE_VIRTUALALLOC

  1117.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1118.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1119. #else

  1120.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1121.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1122. #endif

  1123. 

  1124. #ifdef MAP_ANONYMOUS

  1125.             if (c->lumMmx2FilterCode == MAP_FAILED || c->chrMmx2FilterCode == MAP_FAILED)

  1126. #else

  1127.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1128. #endif

  1129.             {

  1130.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1131.                 return AVERROR(ENOMEM);

  1132.             }

  1133. 

  1134.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1135.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1136.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1137.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1138. 

  1139.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode,

  1140.                             c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1141.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1142.                             c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1143. 

  1144. #if USE_MMAP

  1145.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1146.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1147. #endif

  1148.         } else

  1149. #endif /* HAVE_MMXEXT_INLINE */

  1150.         {

  1151.             const int filterAlign =

  1152.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1153.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1154.                 1;

  1155. 

  1156.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1157.                            &c->hLumFilterSize, c->lumXInc,

  1158.                            srcW, dstW, filterAlign, 1 << 14,

  1159.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1160.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1161.                            c->param) < 0)

  1162.                 goto fail;

  1163.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1164.                            &c->hChrFilterSize, c->chrXInc,

  1165.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1166.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1167.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1168.                            c->param) < 0)

  1169.                 goto fail;

  1170.         }

  1171.     } // initialize horizontal stuff

  1172. 

  1173.     /* precalculate vertical scaler filter coefficients */

  1174.     {

  1175.         const int filterAlign =

  1176.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1177.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1178.             1;

  1179. 

  1180.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1181.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1182.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1183.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1184.                        c->param) < 0)

  1185.             goto fail;

  1186.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1187.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1188.                        filterAlign, (1 << 12),

  1189.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1190.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1191.                        c->param) < 0)

  1192.             goto fail;

  1193. 

  1194. #if HAVE_ALTIVEC

  1195.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1196.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1197. 

  1198.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1199.             int j;

  1200.             short *p = (short *)&c->vYCoeffsBank[i];

  1201.             for (j = 0; j < 8; j++)

  1202.                 p[j] = c->vLumFilter[i];

  1203.         }

  1204. 

  1205.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1206.             int j;

  1207.             short *p = (short *)&c->vCCoeffsBank[i];

  1208.             for (j = 0; j < 8; j++)

  1209.                 p[j] = c->vChrFilter[i];

  1210.         }

  1211. #endif

  1212.     }

  1213. 

  1214.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1215.     c->vLumBufSize = c->vLumFilterSize;

  1216.     c->vChrBufSize = c->vChrFilterSize;

  1217.     for (i = 0; i < dstH; i++) {

  1218.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1219.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1220.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1221.                                << c->chrSrcVSubSample));

  1222. 

  1223.         nextSlice >>= c->chrSrcVSubSample;

  1224.         nextSlice <<= c->chrSrcVSubSample;

  1225.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1226.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1227.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1228.             (nextSlice >> c->chrSrcVSubSample))

  1229.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1230.                              c->vChrFilterPos[chrI];

  1231.     }

  1232. 

  1233.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1234.      * need to allocate several megabytes to handle all possible cases) */

  1235.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1236.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1237.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1238.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1239.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1240.     /* Note we need at least one pixel more at the end because of the MMX code

  1241.      * (just in case someone wants to replace the 4000/8000). */

  1242.     /* align at 16 bytes for AltiVec */

  1243.     for (i = 0; i < c->vLumBufSize; i++) {

  1244.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1245.                           dst_stride + 16, fail);

  1246.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1247.     }

  1248.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1249.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1250.     c->uv_offx2 = dst_stride + 16;

  1251.     for (i = 0; i < c->vChrBufSize; i++) {

  1252.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1253.                          dst_stride * 2 + 32, fail);

  1254.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1255.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1256.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1257.     }

  1258.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1259.         for (i = 0; i < c->vLumBufSize; i++) {

  1260.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1261.                               dst_stride + 16, fail);

  1262.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1263.         }

  1264. 

  1265.     // try to avoid drawing green stuff between the right end and the stride end

  1266.     for (i = 0; i < c->vChrBufSize; i++)

  1267.         if(desc_dst->comp[0].depth_minus1 == 15){

  1268.             av_assert0(c->dstBpc > 14);

  1269.             for(j=0; j<dst_stride/2+1; j++)

  1270.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1271.         } else

  1272.             for(j=0; j<dst_stride+1; j++)

  1273.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1274. 

  1275.     av_assert0(c->chrDstH <= dstH);

  1276. 

  1277.     if (flags & SWS_PRINT_INFO) {

  1278.         if (flags & SWS_FAST_BILINEAR)

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

  1280.         else if (flags & SWS_BILINEAR)

  1281.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1282.         else if (flags & SWS_BICUBIC)

  1283.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1284.         else if (flags & SWS_X)

  1285.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1286.         else if (flags & SWS_POINT)

  1287.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1288.         else if (flags & SWS_AREA)

  1289.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1290.         else if (flags & SWS_BICUBLIN)

  1291.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1292.         else if (flags & SWS_GAUSS)

  1293.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1294.         else if (flags & SWS_SINC)

  1295.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1296.         else if (flags & SWS_LANCZOS)

  1297.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1298.         else if (flags & SWS_SPLINE)

  1299.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1300.         else

  1301.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1302. 

  1303.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1304.                av_get_pix_fmt_name(srcFormat),

  1305. #ifdef DITHER1XBPP

  1306.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1307.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1308.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1309.                                                              "dithered " : "",

  1310. #else

  1311.                "",

  1312. #endif

  1313.                av_get_pix_fmt_name(dstFormat));

  1314. 

  1315.         if (INLINE_MMXEXT(cpu_flags))

  1316.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1317.         else if (INLINE_AMD3DNOW(cpu_flags))

  1318.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1319.         else if (INLINE_MMX(cpu_flags))

  1320.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1321.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1322.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1323.         else

  1324.             av_log(c, AV_LOG_INFO, "using C\n");

  1325. 

  1326.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1327.         av_log(c, AV_LOG_DEBUG,

  1328.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1329.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1330.         av_log(c, AV_LOG_DEBUG,

  1331.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1332.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1333.                c->chrXInc, c->chrYInc);

  1334.     }

  1335. 

  1336.     c->swScale = ff_getSwsFunc(c);

  1337.     return 0;

  1338. fail: // FIXME replace things by appropriate error codes

  1339.     return -1;

  1340. }

  1341. 

  1342. #if FF_API_SWS_GETCONTEXT

  1343. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1344.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1345.                            int flags, SwsFilter *srcFilter,

  1346.                            SwsFilter *dstFilter, const double *param)

  1347. {

  1348.     SwsContext *c;

  1349. 

  1350.     if (!(c = sws_alloc_context()))

  1351.         return NULL;

  1352. 

  1353.     c->flags     = flags;

  1354.     c->srcW      = srcW;

  1355.     c->srcH      = srcH;

  1356.     c->dstW      = dstW;

  1357.     c->dstH      = dstH;

  1358.     c->srcRange  = handle_jpeg(&srcFormat);

  1359.     c->dstRange  = handle_jpeg(&dstFormat);

  1360.     c->src0Alpha = handle_0alpha(&srcFormat);

  1361.     c->dst0Alpha = handle_0alpha(&dstFormat);

  1362.     c->srcFormat = srcFormat;

  1363.     c->dstFormat = dstFormat;

  1364. 

  1365.     if (param) {

  1366.         c->param[0] = param[0];

  1367.         c->param[1] = param[1];

  1368.     }

  1369.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1370.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1371.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1372. 

  1373.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1374.         sws_freeContext(c);

  1375.         return NULL;

  1376.     }

  1377. 

  1378.     return c;

  1379. }

  1380. #endif

  1381. 

  1382. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1383.                                 float lumaSharpen, float chromaSharpen,

  1384.                                 float chromaHShift, float chromaVShift,

  1385.                                 int verbose)

  1386. {

  1387.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1388.     if (!filter)

  1389.         return NULL;

  1390. 

  1391.     if (lumaGBlur != 0.0) {

  1392.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1393.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1394.     } else {

  1395.         filter->lumH = sws_getIdentityVec();

  1396.         filter->lumV = sws_getIdentityVec();

  1397.     }

  1398. 

  1399.     if (chromaGBlur != 0.0) {

  1400.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1401.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1402.     } else {

  1403.         filter->chrH = sws_getIdentityVec();

  1404.         filter->chrV = sws_getIdentityVec();

  1405.     }

  1406. 

  1407.     if (chromaSharpen != 0.0) {

  1408.         SwsVector *id = sws_getIdentityVec();

  1409.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1410.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1411.         sws_addVec(filter->chrH, id);

  1412.         sws_addVec(filter->chrV, id);

  1413.         sws_freeVec(id);

  1414.     }

  1415. 

  1416.     if (lumaSharpen != 0.0) {

  1417.         SwsVector *id = sws_getIdentityVec();

  1418.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1419.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1420.         sws_addVec(filter->lumH, id);

  1421.         sws_addVec(filter->lumV, id);

  1422.         sws_freeVec(id);

  1423.     }

  1424. 

  1425.     if (chromaHShift != 0.0)

  1426.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1427. 

  1428.     if (chromaVShift != 0.0)

  1429.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1430. 

  1431.     sws_normalizeVec(filter->chrH, 1.0);

  1432.     sws_normalizeVec(filter->chrV, 1.0);

  1433.     sws_normalizeVec(filter->lumH, 1.0);

  1434.     sws_normalizeVec(filter->lumV, 1.0);

  1435. 

  1436.     if (verbose)

  1437.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1438.     if (verbose)

  1439.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1440. 

  1441.     return filter;

  1442. }

  1443. 

  1444. SwsVector *sws_allocVec(int length)

  1445. {

  1446.     SwsVector *vec;

  1447. 

  1448.     if(length <= 0 || length > INT_MAX/ sizeof(double))

  1449.         return NULL;

  1450. 

  1451.     vec = av_malloc(sizeof(SwsVector));

  1452.     if (!vec)

  1453.         return NULL;

  1454.     vec->length = length;

  1455.     vec->coeff  = av_malloc(sizeof(double) * length);

  1456.     if (!vec->coeff)

  1457.         av_freep(&vec);

  1458.     return vec;

  1459. }

  1460. 

  1461. SwsVector *sws_getGaussianVec(double variance, double quality)

  1462. {

  1463.     const int length = (int)(variance * quality + 0.5) | 1;

  1464.     int i;

  1465.     double middle  = (length - 1) * 0.5;

  1466.     SwsVector *vec;

  1467. 

  1468.     if(variance < 0 || quality < 0)

  1469.         return NULL;

  1470. 

  1471.     vec = sws_allocVec(length);

  1472. 

  1473.     if (!vec)

  1474.         return NULL;

  1475. 

  1476.     for (i = 0; i < length; i++) {

  1477.         double dist = i - middle;

  1478.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1479.                         sqrt(2 * variance * M_PI);

  1480.     }

  1481. 

  1482.     sws_normalizeVec(vec, 1.0);

  1483. 

  1484.     return vec;

  1485. }

  1486. 

  1487. SwsVector *sws_getConstVec(double c, int length)

  1488. {

  1489.     int i;

  1490.     SwsVector *vec = sws_allocVec(length);

  1491. 

  1492.     if (!vec)

  1493.         return NULL;

  1494. 

  1495.     for (i = 0; i < length; i++)

  1496.         vec->coeff[i] = c;

  1497. 

  1498.     return vec;

  1499. }

  1500. 

  1501. SwsVector *sws_getIdentityVec(void)

  1502. {

  1503.     return sws_getConstVec(1.0, 1);

  1504. }

  1505. 

  1506. static double sws_dcVec(SwsVector *a)

  1507. {

  1508.     int i;

  1509.     double sum = 0;

  1510. 

  1511.     for (i = 0; i < a->length; i++)

  1512.         sum += a->coeff[i];

  1513. 

  1514.     return sum;

  1515. }

  1516. 

  1517. void sws_scaleVec(SwsVector *a, double scalar)

  1518. {

  1519.     int i;

  1520. 

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

  1522.         a->coeff[i] *= scalar;

  1523. }

  1524. 

  1525. void sws_normalizeVec(SwsVector *a, double height)

  1526. {

  1527.     sws_scaleVec(a, height / sws_dcVec(a));

  1528. }

  1529. 

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

  1531. {

  1532.     int length = a->length + b->length - 1;

  1533.     int i, j;

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

  1535. 

  1536.     if (!vec)

  1537.         return NULL;

  1538. 

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

  1540.         for (j = 0; j < b->length; j++) {

  1541.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1542.         }

  1543.     }

  1544. 

  1545.     return vec;

  1546. }

  1547. 

  1548. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1549. {

  1550.     int length = FFMAX(a->length, b->length);

  1551.     int i;

  1552.     SwsVector *vec = sws_getConstVec(0.0, length);

  1553. 

  1554.     if (!vec)

  1555.         return NULL;

  1556. 

  1557.     for (i = 0; i < a->length; i++)

  1558.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1559.     for (i = 0; i < b->length; i++)

  1560.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1561. 

  1562.     return vec;

  1563. }

  1564. 

  1565. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1566. {

  1567.     int length = FFMAX(a->length, b->length);

  1568.     int i;

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

  1570. 

  1571.     if (!vec)

  1572.         return NULL;

  1573. 

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

  1575.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1576.     for (i = 0; i < b->length; i++)

  1577.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1578. 

  1579.     return vec;

  1580. }

  1581. 

  1582. /* shift left / or right if "shift" is negative */

  1583. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1584. {

  1585.     int length = a->length + FFABS(shift) * 2;

  1586.     int i;

  1587.     SwsVector *vec = sws_getConstVec(0.0, length);

  1588. 

  1589.     if (!vec)

  1590.         return NULL;

  1591. 

  1592.     for (i = 0; i < a->length; i++) {

  1593.         vec->coeff[i + (length    - 1) / 2 -

  1594.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1595.     }

  1596. 

  1597.     return vec;

  1598. }

  1599. 

  1600. void sws_shiftVec(SwsVector *a, int shift)

  1601. {

  1602.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1603.     av_free(a->coeff);

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

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

  1606.     av_free(shifted);

  1607. }

  1608. 

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

  1610. {

  1611.     SwsVector *sum = sws_sumVec(a, b);

  1612.     av_free(a->coeff);

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

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

  1615.     av_free(sum);

  1616. }

  1617. 

  1618. void sws_subVec(SwsVector *a, SwsVector *b)

  1619. {

  1620.     SwsVector *diff = sws_diffVec(a, b);

  1621.     av_free(a->coeff);

  1622.     a->coeff  = diff->coeff;

  1623.     a->length = diff->length;

  1624.     av_free(diff);

  1625. }

  1626. 

  1627. void sws_convVec(SwsVector *a, SwsVector *b)

  1628. {

  1629.     SwsVector *conv = sws_getConvVec(a, b);

  1630.     av_free(a->coeff);

  1631.     a->coeff  = conv->coeff;

  1632.     a->length = conv->length;

  1633.     av_free(conv);

  1634. }

  1635. 

  1636. SwsVector *sws_cloneVec(SwsVector *a)

  1637. {

  1638.     int i;

  1639.     SwsVector *vec = sws_allocVec(a->length);

  1640. 

  1641.     if (!vec)

  1642.         return NULL;

  1643. 

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

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

  1646. 

  1647.     return vec;

  1648. }

  1649. 

  1650. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1651. {

  1652.     int i;

  1653.     double max = 0;

  1654.     double min = 0;

  1655.     double range;

  1656. 

  1657.     for (i = 0; i < a->length; i++)

  1658.         if (a->coeff[i] > max)

  1659.             max = a->coeff[i];

  1660. 

  1661.     for (i = 0; i < a->length; i++)

  1662.         if (a->coeff[i] < min)

  1663.             min = a->coeff[i];

  1664. 

  1665.     range = max - min;

  1666. 

  1667.     for (i = 0; i < a->length; i++) {

  1668.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1669.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1670.         for (; x > 0; x--)

  1671.             av_log(log_ctx, log_level, " ");

  1672.         av_log(log_ctx, log_level, "|\n");

  1673.     }

  1674. }

  1675. 

  1676. void sws_freeVec(SwsVector *a)

  1677. {

  1678.     if (!a)

  1679.         return;

  1680.     av_freep(&a->coeff);

  1681.     a->length = 0;

  1682.     av_free(a);

  1683. }

  1684. 

  1685. void sws_freeFilter(SwsFilter *filter)

  1686. {

  1687.     if (!filter)

  1688.         return;

  1689. 

  1690.     if (filter->lumH)

  1691.         sws_freeVec(filter->lumH);

  1692.     if (filter->lumV)

  1693.         sws_freeVec(filter->lumV);

  1694.     if (filter->chrH)

  1695.         sws_freeVec(filter->chrH);

  1696.     if (filter->chrV)

  1697.         sws_freeVec(filter->chrV);

  1698.     av_free(filter);

  1699. }

  1700. 

  1701. void sws_freeContext(SwsContext *c)

  1702. {

  1703.     int i;

  1704.     if (!c)

  1705.         return;

  1706. 

  1707.     if (c->lumPixBuf) {

  1708.         for (i = 0; i < c->vLumBufSize; i++)

  1709.             av_freep(&c->lumPixBuf[i]);

  1710.         av_freep(&c->lumPixBuf);

  1711.     }

  1712. 

  1713.     if (c->chrUPixBuf) {

  1714.         for (i = 0; i < c->vChrBufSize; i++)

  1715.             av_freep(&c->chrUPixBuf[i]);

  1716.         av_freep(&c->chrUPixBuf);

  1717.         av_freep(&c->chrVPixBuf);

  1718.     }

  1719. 

  1720.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1721.         for (i = 0; i < c->vLumBufSize; i++)

  1722.             av_freep(&c->alpPixBuf[i]);

  1723.         av_freep(&c->alpPixBuf);

  1724.     }

  1725. 

  1726.     av_freep(&c->vLumFilter);

  1727.     av_freep(&c->vChrFilter);

  1728.     av_freep(&c->hLumFilter);

  1729.     av_freep(&c->hChrFilter);

  1730. #if HAVE_ALTIVEC

  1731.     av_freep(&c->vYCoeffsBank);

  1732.     av_freep(&c->vCCoeffsBank);

  1733. #endif

  1734. 

  1735.     av_freep(&c->vLumFilterPos);

  1736.     av_freep(&c->vChrFilterPos);

  1737.     av_freep(&c->hLumFilterPos);

  1738.     av_freep(&c->hChrFilterPos);

  1739. 

  1740. #if HAVE_MMX_INLINE

  1741. #if USE_MMAP

  1742.     if (c->lumMmx2FilterCode)

  1743.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1744.     if (c->chrMmx2FilterCode)

  1745.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1746. #elif HAVE_VIRTUALALLOC

  1747.     if (c->lumMmx2FilterCode)

  1748.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1749.     if (c->chrMmx2FilterCode)

  1750.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1751. #else

  1752.     av_free(c->lumMmx2FilterCode);

  1753.     av_free(c->chrMmx2FilterCode);

  1754. #endif

  1755.     c->lumMmx2FilterCode = NULL;

  1756.     c->chrMmx2FilterCode = NULL;

  1757. #endif /* HAVE_MMX_INLINE */

  1758. 

  1759.     av_freep(&c->yuvTable);

  1760.     av_freep(&c->formatConvBuffer);

  1761. 

  1762.     av_free(c);

  1763. }

  1764. 

  1765. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1766.                                         int srcH, enum AVPixelFormat srcFormat,

  1767.                                         int dstW, int dstH,

  1768.                                         enum AVPixelFormat dstFormat, int flags,

  1769.                                         SwsFilter *srcFilter,

  1770.                                         SwsFilter *dstFilter,

  1771.                                         const double *param)

  1772. {

  1773.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1774.                                              SWS_PARAM_DEFAULT };

  1775. 

  1776.     if (!param)

  1777.         param = default_param;

  1778. 

  1779.     if (context &&

  1780.         (context->srcW      != srcW      ||

  1781.          context->srcH      != srcH      ||

  1782.          context->srcFormat != srcFormat ||

  1783.          context->dstW      != dstW      ||

  1784.          context->dstH      != dstH      ||

  1785.          context->dstFormat != dstFormat ||

  1786.          context->flags     != flags     ||

  1787.          context->param[0]  != param[0]  ||

  1788.          context->param[1]  != param[1])) {

  1789.         sws_freeContext(context);

  1790.         context = NULL;

  1791.     }

  1792. 

  1793.     if (!context) {

  1794.         if (!(context = sws_alloc_context()))

  1795.             return NULL;

  1796.         context->srcW      = srcW;

  1797.         context->srcH      = srcH;

  1798.         context->srcRange  = handle_jpeg(&srcFormat);

  1799.         context->src0Alpha = handle_0alpha(&srcFormat);

  1800.         context->srcFormat = srcFormat;

  1801.         context->dstW      = dstW;

  1802.         context->dstH      = dstH;

  1803.         context->dstRange  = handle_jpeg(&dstFormat);

  1804.         context->dst0Alpha = handle_0alpha(&dstFormat);

  1805.         context->dstFormat = dstFormat;

  1806.         context->flags     = flags;

  1807.         context->param[0]  = param[0];

  1808.         context->param[1]  = param[1];

  1809.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1810.                                  context->srcRange,

  1811.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1812.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1813.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1814.             sws_freeContext(context);

  1815.             return NULL;

  1816.         }

  1817.     }

  1818.     return context;

  1819. }