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FFmpeg/libswscale/utils.c

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  1. /*

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

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #include <assert.h>

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

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

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avutil.h"

  42. #include "libavutil/bswap.h"

  43. #include "libavutil/cpu.h"

  44. #include "libavutil/intreadwrite.h"

  45. #include "libavutil/mathematics.h"

  46. #include "libavutil/opt.h"

  47. #include "libavutil/pixdesc.h"

  48. #include "libavutil/ppc/cpu.h"

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

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

  51. #include "rgb2rgb.h"

  52. #include "swscale.h"

  53. #include "swscale_internal.h"

  54. 

  55. unsigned swscale_version(void)

  56. {

  57.     return LIBSWSCALE_VERSION_INT;

  58. }

  59. 

  60. const char *swscale_configuration(void)

  61. {

  62.     return LIBAV_CONFIGURATION;

  63. }

  64. 

  65. const char *swscale_license(void)

  66. {

  67. #define LICENSE_PREFIX "libswscale license: "

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

  69. }

  70. 

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

  72. 

  73. typedef struct FormatEntry {

  74.     uint8_t is_supported_in         :1;

  75.     uint8_t is_supported_out        :1;

  76.     uint8_t is_supported_endianness :1;

  77. } FormatEntry;

  78. 

  79. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  110.     [AV_PIX_FMT_GRAY12BE]    = { 1, 1 },

  111.     [AV_PIX_FMT_GRAY12LE]    = { 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]    = { 0, 0, 1 },

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

  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_YA8]         = { 1, 0 },

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

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

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

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

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

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

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

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

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

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

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

  171.     [AV_PIX_FMT_YUV420P12LE] = { 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_YUV444P9BE]  = { 1, 1 },

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

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

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

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

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

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

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

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

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

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

  189.     [AV_PIX_FMT_GBRP12LE]    = { 1, 1 },

  190.     [AV_PIX_FMT_GBRP12BE]    = { 1, 1 },

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

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

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

  194.     [AV_PIX_FMT_GBRAP10LE]   = { 1, 1 },

  195.     [AV_PIX_FMT_GBRAP10BE]   = { 1, 1 },

  196.     [AV_PIX_FMT_GBRAP12LE]   = { 1, 1 },

  197.     [AV_PIX_FMT_GBRAP12BE]   = { 1, 1 },

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

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

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

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

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

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

  204. };

  205. 

  206. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  207. {

  208.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  209.            format_entries[pix_fmt].is_supported_in : 0;

  210. }

  211. 

  212. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  213. {

  214.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  215.            format_entries[pix_fmt].is_supported_out : 0;

  216. }

  217. 

  218. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  219. {

  220.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  221.            format_entries[pix_fmt].is_supported_endianness : 0;

  222. }

  223. 

  224. const char *sws_format_name(enum AVPixelFormat format)

  225. {

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

  227.     if (desc)

  228.         return desc->name;

  229.     else

  230.         return "Unknown format";

  231. }

  232. 

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

  234.                              double dist)

  235. {

  236.     if (dist <= 1.0)

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

  238.     else

  239.         return getSplineCoeff(0.0,

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

  241.                                c + 3.0 * d,

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

  243.                               dist - 1.0);

  244. }

  245. 

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

  247.                               int *outFilterSize, int xInc, int srcW,

  248.                               int dstW, int filterAlign, int one,

  249.                               int flags, int cpu_flags,

  250.                               SwsVector *srcFilter, SwsVector *dstFilter,

  251.                               double param[2], int is_horizontal)

  252. {

  253.     int i;

  254.     int filterSize;

  255.     int filter2Size;

  256.     int minFilterSize;

  257.     int64_t *filter    = NULL;

  258.     int64_t *filter2   = NULL;

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

  260.     int ret            = -1;

  261. 

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

  263. 

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

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

  266. 

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

  268.         int i;

  269.         filterSize = 1;

  270.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  272. 

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

  274.             filter[i * filterSize] = fone;

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

  276.         }

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

  278.         int i;

  279.         int xDstInSrc;

  280.         filterSize = 1;

  281.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  283. 

  284.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  287. 

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

  289.             filter[i]       = fone;

  290.             xDstInSrc      += xInc;

  291.         }

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

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

  294.         int i;

  295.         int xDstInSrc;

  296.         filterSize = 2;

  297.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  299. 

  300.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  303.             int j;

  304. 

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

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

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

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

  309.                                 (fone >> 16);

  310.                 if (coeff < 0)

  311.                     coeff = 0;

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

  313.                 xx++;

  314.             }

  315.             xDstInSrc += xInc;

  316.         }

  317.     } else {

  318.         int64_t xDstInSrc;

  319.         int sizeFactor;

  320. 

  321.         if (flags & SWS_BICUBIC)

  322.             sizeFactor = 4;

  323.         else if (flags & SWS_X)

  324.             sizeFactor = 8;

  325.         else if (flags & SWS_AREA)

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

  327.         else if (flags & SWS_GAUSS)

  328.             sizeFactor = 8;     // infinite ;)

  329.         else if (flags & SWS_LANCZOS)

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

  331.         else if (flags & SWS_SINC)

  332.             sizeFactor = 20;    // infinite ;)

  333.         else if (flags & SWS_SPLINE)

  334.             sizeFactor = 20;    // infinite ;)

  335.         else if (flags & SWS_BILINEAR)

  336.             sizeFactor = 2;

  337.         else {

  338.             sizeFactor = 0;     // GCC warning killer

  339.             assert(0);

  340.         }

  341. 

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

  343.             filterSize = 1 + sizeFactor;    // upscale

  344.         else

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

  346. 

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

  348.         filterSize = FFMAX(filterSize, 1);

  349. 

  350.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  352. 

  353.         xDstInSrc = xInc - 0x10000;

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

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

  356.             int j;

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

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

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

  360.                 double floatd;

  361.                 int64_t coeff;

  362. 

  363.                 if (xInc > 1 << 16)

  364.                     d = d * dstW / srcW;

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

  366. 

  367.                 if (flags & SWS_BICUBIC) {

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

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

  370. 

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

  372.                         coeff = 0.0;

  373.                     } else {

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

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

  376. 

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

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

  379.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  380.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  381.                         else

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

  383.                                       (6 * B + 30 * C) * dd  +

  384.                                     (-12 * B - 48 * C) * d   +

  385.                                       (8 * B + 24 * C) * (1 << 30);

  386.                     }

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

  388.                 }

  389.                 else if (flags & SWS_X) {

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

  391.                     double c;

  392. 

  393.                     if (floatd < 1.0)

  394.                         c = cos(floatd * M_PI);

  395.                     else

  396.                         c = -1.0;

  397.                     if (c < 0.0)

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

  399.                     else

  400.                         c = pow(c, A);

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

  402.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  408.                     else

  409.                         coeff = 0.0;

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

  411.                 } else if (flags & SWS_GAUSS) {

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

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

  414.                 } else if (flags & SWS_SINC) {

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

  416.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  420.                     if (floatd > p)

  421.                         coeff = 0;

  422.                 } else if (flags & SWS_BILINEAR) {

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

  424.                     if (coeff < 0)

  425.                         coeff = 0;

  426.                     coeff *= fone >> 30;

  427.                 } else if (flags & SWS_SPLINE) {

  428.                     double p = -2.196152422706632;

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

  430.                 } else {

  431.                     coeff = 0.0; // GCC warning killer

  432.                     assert(0);

  433.                 }

  434. 

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

  436.                 xx++;

  437.             }

  438.             xDstInSrc += 2 * xInc;

  439.         }

  440.     }

  441. 

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

  443.      * av_free(filter);

  444.      */

  445.     assert(filterSize > 0);

  446.     filter2Size = filterSize;

  447.     if (srcFilter)

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

  449.     if (dstFilter)

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

  451.     assert(filter2Size > 0);

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

  453. 

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

  455.         int j, k;

  456. 

  457.         if (srcFilter) {

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

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

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

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

  462.             }

  463.         } else {

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

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

  466.         }

  467.         // FIXME dstFilter

  468. 

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

  470.     }

  471.     av_freep(&filter);

  472. 

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

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

  475.     minFilterSize = 0;

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

  477.         int min = filter2Size;

  478.         int j;

  479.         int64_t cutOff = 0.0;

  480. 

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

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

  483.             int k;

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

  485. 

  486.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  487.                 break;

  488. 

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

  490.              * filter otherwise */

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

  492.                 break;

  493. 

  494.             // move filter coefficients left

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

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

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

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

  499.         }

  500. 

  501.         cutOff = 0;

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

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

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

  505. 

  506.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  507.                 break;

  508.             min--;

  509.         }

  510. 

  511.         if (min > minFilterSize)

  512.             minFilterSize = min;

  513.     }

  514. 

  515.     if (PPC_ALTIVEC(cpu_flags)) {

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

  517.         if (minFilterSize < 5)

  518.             filterAlign = 4;

  519. 

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

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

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

  523.         if (minFilterSize < 3)

  524.             filterAlign = 1;

  525.     }

  526. 

  527.     if (INLINE_MMX(cpu_flags)) {

  528.         // special case for unscaled vertical filtering

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

  530.             filterAlign = 1;

  531.     }

  532. 

  533.     assert(minFilterSize > 0);

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

  535.     assert(filterSize > 0);

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

  537.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  539.         goto fail;

  540.     *outFilterSize = filterSize;

  541. 

  542.     if (flags & SWS_PRINT_INFO)

  543.         av_log(NULL, AV_LOG_VERBOSE,

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

  545.                filter2Size, filterSize);

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

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

  548.         int j;

  549. 

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

  551.             if (j >= filter2Size)

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

  553.             else

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

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

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

  557.         }

  558.     }

  559. 

  560.     // FIXME try to align filterPos if possible

  561. 

  562.     // fix borders

  563.     if (is_horizontal) {

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

  565.             int j;

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

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

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

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

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

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

  572.                 }

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

  574.             }

  575. 

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

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

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

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

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

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

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

  583.                 }

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

  585.             }

  586.         }

  587.     }

  588. 

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

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

  591.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  593. 

  594.     /* normalize & store in outFilter */

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

  596.         int j;

  597.         int64_t error = 0;

  598.         int64_t sum   = 0;

  599. 

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

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

  602.         }

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

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

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

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

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

  608.             error                                  = v - intV * sum;

  609.         }

  610.     }

  611. 

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

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

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

  615.                                                       * read over the end */

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

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

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

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

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

  621.     }

  622. 

  623.     ret = 0;

  624. 

  625. fail:

  626.     av_free(filter);

  627.     av_free(filter2);

  628.     return ret;

  629. }

  630. 

  631. #if HAVE_MMXEXT_INLINE

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

  633.                                        int16_t *filter, int32_t *filterPos,

  634.                                        int numSplits)

  635. {

  636.     uint8_t *fragmentA;

  637.     x86_reg imm8OfPShufW1A;

  638.     x86_reg imm8OfPShufW2A;

  639.     x86_reg fragmentLengthA;

  640.     uint8_t *fragmentB;

  641.     x86_reg imm8OfPShufW1B;

  642.     x86_reg imm8OfPShufW2B;

  643.     x86_reg fragmentLengthB;

  644.     int fragmentPos;

  645. 

  646.     int xpos, i;

  647. 

  648.     // create an optimized horizontal scaling routine

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

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

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

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

  653.      */

  654. 

  655.     // code fragment

  656. 

  657.     __asm__ volatile (

  658.         "jmp                         9f                 \n\t"

  659.         // Begin

  660.         "0:                                             \n\t"

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

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

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

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

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

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

  667.         "1:                                             \n\t"

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

  669.         "2:                                             \n\t"

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

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

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

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

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

  675. 

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

  677. 

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

  679.         // End

  680.         "9:                                             \n\t"

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

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

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

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

  685.         "dec                         %1                 \n\t"

  686.         "dec                         %2                 \n\t"

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

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

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

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

  691. 

  692. 

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

  694.           "=r" (fragmentLengthA)

  695.         );

  696. 

  697.     __asm__ volatile (

  698.         "jmp                         9f                 \n\t"

  699.         // Begin

  700.         "0:                                             \n\t"

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

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

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

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

  705.         "1:                                             \n\t"

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

  707.         "2:                                             \n\t"

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

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

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

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

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

  713. 

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

  715. 

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

  717.         // End

  718.         "9:                                             \n\t"

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

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

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

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

  723.         "dec                         %1                 \n\t"

  724.         "dec                         %2                 \n\t"

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

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

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

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

  729. 

  730. 

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

  732.           "=r" (fragmentLengthB)

  733.         );

  734. 

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

  736.     fragmentPos = 0;

  737. 

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

  739.         int xx = xpos >> 16;

  740. 

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

  742.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  752.             int shift              = 0;

  753. 

  754.             if (filterCode) {

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

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

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

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

  759.                 filterPos[i / 2] = xx;

  760. 

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

  762. 

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

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

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

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

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

  768.                                                                (c << 4) |

  769.                                                                (d << 6);

  770. 

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

  772.                     shift = maxShift;               // avoid overread

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

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

  775. 

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

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

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

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

  780.                 }

  781.             }

  782. 

  783.             fragmentPos += fragmentLength;

  784. 

  785.             if (filterCode)

  786.                 filterCode[fragmentPos] = RET;

  787.         }

  788.         xpos += xInc;

  789.     }

  790.     if (filterCode)

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

  792. 

  793.     return fragmentPos + 1;

  794. }

  795. #endif /* HAVE_MMXEXT_INLINE */

  796. 

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

  798. {

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

  800.     *h = desc->log2_chroma_w;

  801.     *v = desc->log2_chroma_h;

  802. }

  803. 

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

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

  806.                              int brightness, int contrast, int saturation)

  807. {

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

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

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

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

  812. 

  813.     c->brightness = brightness;

  814.     c->contrast   = contrast;

  815.     c->saturation = saturation;

  816.     c->srcRange   = srcRange;

  817.     c->dstRange   = dstRange;

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

  819.         return -1;

  820. 

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

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

  823. 

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

  825.                              contrast, saturation);

  826.     // FIXME factorize

  827. 

  828.     if (ARCH_PPC)

  829.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  830.                                    contrast, saturation);

  831.     return 0;

  832. }

  833. 

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

  835.                              int *srcRange, int **table, int *dstRange,

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

  837. {

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

  839.         return -1;

  840. 

  841.     *inv_table  = c->srcColorspaceTable;

  842.     *table      = c->dstColorspaceTable;

  843.     *srcRange   = c->srcRange;

  844.     *dstRange   = c->dstRange;

  845.     *brightness = c->brightness;

  846.     *contrast   = c->contrast;

  847.     *saturation = c->saturation;

  848. 

  849.     return 0;

  850. }

  851. 

  852. static int handle_jpeg(enum AVPixelFormat *format)

  853. {

  854.     switch (*format) {

  855.     case AV_PIX_FMT_YUVJ420P:

  856.         *format = AV_PIX_FMT_YUV420P;

  857.         return 1;

  858.     case AV_PIX_FMT_YUVJ422P:

  859.         *format = AV_PIX_FMT_YUV422P;

  860.         return 1;

  861.     case AV_PIX_FMT_YUVJ444P:

  862.         *format = AV_PIX_FMT_YUV444P;

  863.         return 1;

  864.     case AV_PIX_FMT_YUVJ440P:

  865.         *format = AV_PIX_FMT_YUV440P;

  866.         return 1;

  867.     default:

  868.         return 0;

  869.     }

  870. }

  871. 

  872. SwsContext *sws_alloc_context(void)

  873. {

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

  875. 

  876.     if (c) {

  877.         c->av_class = &ff_sws_context_class;

  878.         av_opt_set_defaults(c);

  879.     }

  880. 

  881.     return c;

  882. }

  883. 

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

  885.                              SwsFilter *dstFilter)

  886. {

  887.     int i;

  888.     int usesVFilter, usesHFilter;

  889.     int unscaled;

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

  891.     int srcW              = c->srcW;

  892.     int srcH              = c->srcH;

  893.     int dstW              = c->dstW;

  894.     int dstH              = c->dstH;

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

  896.     int dst_stride_px     = dst_stride >> 1;

  897.     int flags, cpu_flags;

  898.     enum AVPixelFormat srcFormat = c->srcFormat;

  899.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  902. 

  903.     cpu_flags = av_get_cpu_flags();

  904.     flags     = c->flags;

  905.     emms_c();

  906.     if (!rgb15to16)

  907.         ff_rgb2rgb_init();

  908. 

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

  910. 

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

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

  913.     if (!sws_isSupportedInput(srcFormat)) {

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

  915.                sws_format_name(srcFormat));

  916.         return AVERROR(EINVAL);

  917.     }

  918.     if (!sws_isSupportedOutput(dstFormat)) {

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

  920.                sws_format_name(dstFormat));

  921.         return AVERROR(EINVAL);

  922.     }

  923.     }

  924. 

  925.     i = flags & (SWS_POINT         |

  926.                  SWS_AREA          |

  927.                  SWS_BILINEAR      |

  928.                  SWS_FAST_BILINEAR |

  929.                  SWS_BICUBIC       |

  930.                  SWS_X             |

  931.                  SWS_GAUSS         |

  932.                  SWS_LANCZOS       |

  933.                  SWS_SINC          |

  934.                  SWS_SPLINE        |

  935.                  SWS_BICUBLIN);

  936. 

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

  938.     if (!i) {

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

  940.             flags |= SWS_GAUSS;

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

  942.             flags |= SWS_SINC;

  943.         else

  944.             flags |= SWS_LANCZOS;

  945.         c->flags = flags;

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

  947.         av_log(c, AV_LOG_ERROR,

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

  949.         return AVERROR(EINVAL);

  950.     }

  951.     /* sanity check */

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

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

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

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

  956.                srcW, srcH, dstW, dstH);

  957.         return AVERROR(EINVAL);

  958.     }

  959. 

  960.     if (!dstFilter)

  961.         dstFilter = &dummyFilter;

  962.     if (!srcFilter)

  963.         srcFilter = &dummyFilter;

  964. 

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

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

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

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

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

  970. 

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

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

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

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

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

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

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

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

  979. 

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

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

  982. 

  983.     if (isPlanarRGB(dstFormat)) {

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

  985.             av_log(c, AV_LOG_DEBUG,

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

  987.                    av_get_pix_fmt_name(dstFormat));

  988.             flags   |= SWS_FULL_CHR_H_INT;

  989.             c->flags = flags;

  990.         }

  991.     }

  992. 

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

  994.      * chroma interpolation */

  995.     if (flags & SWS_FULL_CHR_H_INT &&

  996.         isAnyRGB(dstFormat)        &&

  997.         !isPlanarRGB(dstFormat)    &&

  998.         dstFormat != AV_PIX_FMT_RGBA  &&

  999.         dstFormat != AV_PIX_FMT_ARGB  &&

  1000.         dstFormat != AV_PIX_FMT_BGRA  &&

  1001.         dstFormat != AV_PIX_FMT_ABGR  &&

  1002.         dstFormat != AV_PIX_FMT_RGB24 &&

  1003.         dstFormat != AV_PIX_FMT_BGR24) {

  1004.         av_log(c, AV_LOG_ERROR,

  1005.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1006.                sws_format_name(dstFormat));

  1007.         flags   &= ~SWS_FULL_CHR_H_INT;

  1008.         c->flags = flags;

  1009.     }

  1010.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1011.         c->chrDstHSubSample = 1;

  1012. 

  1013.     // drop some chroma lines if the user wants it

  1014.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1015.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1016.     c->chrSrcVSubSample += c->vChrDrop;

  1017. 

  1018.     /* drop every other pixel for chroma calculation unless user

  1019.      * wants full chroma */

  1020.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1021.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1022.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1023.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1024.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1025.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1026.         srcFormat != AV_PIX_FMT_GBRAP10BE && srcFormat != AV_PIX_FMT_GBRAP10LE &&

  1027.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1028.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

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

  1030.          (flags & SWS_FAST_BILINEAR)))

  1031.         c->chrSrcHSubSample = 1;

  1032. 

  1033.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

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

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

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

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

  1038. 

  1039.     /* unscaled special cases */

  1040.     if (unscaled && !usesHFilter && !usesVFilter &&

  1041.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1042.         ff_get_unscaled_swscale(c);

  1043. 

  1044.         if (c->swscale) {

  1045.             if (flags & SWS_PRINT_INFO)

  1046.                 av_log(c, AV_LOG_INFO,

  1047.                        "using unscaled %s -> %s special converter\n",

  1048.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1049.             return 0;

  1050.         }

  1051.     }

  1052. 

  1053.     c->srcBpc = desc_src->comp[0].depth;

  1054.     if (c->srcBpc < 8)

  1055.         c->srcBpc = 8;

  1056.     c->dstBpc = desc_dst->comp[0].depth;

  1057.     if (c->dstBpc < 8)

  1058.         c->dstBpc = 8;

  1059.     if (c->dstBpc == 16)

  1060.         dst_stride <<= 1;

  1061.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1062.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1063.                      fail);

  1064.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 12) {

  1065.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1066.                               (srcW & 15) == 0) ? 1 : 0;

  1067.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1068.             && (flags & SWS_FAST_BILINEAR)) {

  1069.             if (flags & SWS_PRINT_INFO)

  1070.                 av_log(c, AV_LOG_INFO,

  1071.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1072.         }

  1073.         if (usesHFilter)

  1074.             c->canMMXEXTBeUsed = 0;

  1075.     } else

  1076.         c->canMMXEXTBeUsed = 0;

  1077. 

  1078.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1079.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1080. 

  1081.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1082.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1083.      * correct scaling.

  1084.      * n-2 is the last chrominance sample available.

  1085.      * This is not perfect, but no one should notice the difference, the more

  1086.      * correct variant would be like the vertical one, but that would require

  1087.      * some special code for the first and last pixel */

  1088.     if (flags & SWS_FAST_BILINEAR) {

  1089.         if (c->canMMXEXTBeUsed) {

  1090.             c->lumXInc += 20;

  1091.             c->chrXInc += 20;

  1092.         }

  1093.         // we don't use the x86 asm scaler if MMX is available

  1094.         else if (INLINE_MMX(cpu_flags)) {

  1095.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1096.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1097.         }

  1098.     }

  1099. 

  1100. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1101. 

  1102.     /* precalculate horizontal scaler filter coefficients */

  1103.     {

  1104. #if HAVE_MMXEXT_INLINE

  1105. // can't downscale !!!

  1106.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1107.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1108.                                                              NULL, NULL, 8);

  1109.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1110.                                                              NULL, NULL, NULL, 4);

  1111. 

  1112. #if USE_MMAP

  1113.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1114.                                           PROT_READ | PROT_WRITE,

  1115.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1116.                                           -1, 0);

  1117.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1118.                                           PROT_READ | PROT_WRITE,

  1119.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1120.                                           -1, 0);

  1121. #elif HAVE_VIRTUALALLOC

  1122.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1123.                                                   c->lumMmxextFilterCodeSize,

  1124.                                                   MEM_COMMIT,

  1125.                                                   PAGE_EXECUTE_READWRITE);

  1126.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1127.                                                   c->chrMmxextFilterCodeSize,

  1128.                                                   MEM_COMMIT,

  1129.                                                   PAGE_EXECUTE_READWRITE);

  1130. #else

  1131.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1132.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1133. #endif

  1134. 

  1135.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1136.                 return AVERROR(ENOMEM);

  1137.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1138.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1139.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1140.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1141. 

  1142.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1143.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1144.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1145.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1146. 

  1147. #if USE_MMAP

  1148.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1149.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1150. #endif

  1151.         } else

  1152. #endif /* HAVE_MMXEXT_INLINE */

  1153.         {

  1154.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1155.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1156. 

  1157.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1158.                            &c->hLumFilterSize, c->lumXInc,

  1159.                            srcW, dstW, filterAlign, 1 << 14,

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

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

  1162.                            c->param, 1) < 0)

  1163.                 goto fail;

  1164.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1165.                            &c->hChrFilterSize, c->chrXInc,

  1166.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

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

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

  1169.                            c->param, 1) < 0)

  1170.                 goto fail;

  1171.         }

  1172.     } // initialize horizontal stuff

  1173. 

  1174.     /* precalculate vertical scaler filter coefficients */

  1175.     {

  1176.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1177.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1178. 

  1179.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1180.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1181.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1182.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1183.                        c->param, 0) < 0)

  1184.             goto fail;

  1185.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1186.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1187.                        filterAlign, (1 << 12),

  1188.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1189.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1190.                        c->param, 0) < 0)

  1191.             goto fail;

  1192. 

  1193. #if HAVE_ALTIVEC

  1194.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1195.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1196. 

  1197.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1198.             int j;

  1199.             short *p = (short *)&c->vYCoeffsBank[i];

  1200.             for (j = 0; j < 8; j++)

  1201.                 p[j] = c->vLumFilter[i];

  1202.         }

  1203. 

  1204.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1205.             int j;

  1206.             short *p = (short *)&c->vCCoeffsBank[i];

  1207.             for (j = 0; j < 8; j++)

  1208.                 p[j] = c->vChrFilter[i];

  1209.         }

  1210. #endif

  1211.     }

  1212. 

  1213.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1214.     c->vLumBufSize = c->vLumFilterSize;

  1215.     c->vChrBufSize = c->vChrFilterSize;

  1216.     for (i = 0; i < dstH; i++) {

  1217.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1218.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1219.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1220.                                << c->chrSrcVSubSample));

  1221. 

  1222.         nextSlice >>= c->chrSrcVSubSample;

  1223.         nextSlice <<= c->chrSrcVSubSample;

  1224.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1225.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1226.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1227.             (nextSlice >> c->chrSrcVSubSample))

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

  1229.                              c->vChrFilterPos[chrI];

  1230.     }

  1231. 

  1232.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1233.      * need to allocate several megabytes to handle all possible cases) */

  1234.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1235.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

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

  1237.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1238.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1239.     /* Note we need at least one pixel more at the end because of the MMX code

  1240.      * (just in case someone wants to replace the 4000/8000). */

  1241.     /* align at 16 bytes for AltiVec */

  1242.     for (i = 0; i < c->vLumBufSize; i++) {

  1243.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1244.                           dst_stride + 16, fail);

  1245.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1246.     }

  1247.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1248.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1249.     c->uv_off_byte = dst_stride + 16;

  1250.     for (i = 0; i < c->vChrBufSize; i++) {

  1251.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1252.                          dst_stride * 2 + 32, fail);

  1253.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1254.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1255.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1256.     }

  1257.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1258.         for (i = 0; i < c->vLumBufSize; i++) {

  1259.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1260.                               dst_stride + 16, fail);

  1261.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1262.         }

  1263. 

  1264.     // try to avoid drawing green stuff between the right end and the stride end

  1265.     for (i = 0; i < c->vChrBufSize; i++)

  1266.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1267. 

  1268.     assert(c->chrDstH <= dstH);

  1269. 

  1270.     if (flags & SWS_PRINT_INFO) {

  1271.         if (flags & SWS_FAST_BILINEAR)

  1272.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1273.         else if (flags & SWS_BILINEAR)

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

  1275.         else if (flags & SWS_BICUBIC)

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

  1277.         else if (flags & SWS_X)

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

  1279.         else if (flags & SWS_POINT)

  1280.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1281.         else if (flags & SWS_AREA)

  1282.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1283.         else if (flags & SWS_BICUBLIN)

  1284.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1285.         else if (flags & SWS_GAUSS)

  1286.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1287.         else if (flags & SWS_SINC)

  1288.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1289.         else if (flags & SWS_LANCZOS)

  1290.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1291.         else if (flags & SWS_SPLINE)

  1292.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1293.         else

  1294.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1295. 

  1296.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1297.                sws_format_name(srcFormat),

  1298. #ifdef DITHER1XBPP

  1299.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1300.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1301.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1302.                                                              "dithered " : "",

  1303. #else

  1304.                "",

  1305. #endif

  1306.                sws_format_name(dstFormat));

  1307. 

  1308.         if (INLINE_MMXEXT(cpu_flags))

  1309.             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

  1310.         else if (INLINE_AMD3DNOW(cpu_flags))

  1311.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1312.         else if (INLINE_MMX(cpu_flags))

  1313.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1314.         else if (PPC_ALTIVEC(cpu_flags))

  1315.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1316.         else

  1317.             av_log(c, AV_LOG_INFO, "using C\n");

  1318. 

  1319.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1320.         av_log(c, AV_LOG_DEBUG,

  1321.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1322.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1323.         av_log(c, AV_LOG_DEBUG,

  1324.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1325.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1326.                c->chrXInc, c->chrYInc);

  1327.     }

  1328. 

  1329.     c->swscale = ff_getSwsFunc(c);

  1330.     return 0;

  1331. fail: // FIXME replace things by appropriate error codes

  1332.     return -1;

  1333. }

  1334. 

  1335. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1336.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1337.                            int flags, SwsFilter *srcFilter,

  1338.                            SwsFilter *dstFilter, const double *param)

  1339. {

  1340.     SwsContext *c;

  1341. 

  1342.     if (!(c = sws_alloc_context()))

  1343.         return NULL;

  1344. 

  1345.     c->flags     = flags;

  1346.     c->srcW      = srcW;

  1347.     c->srcH      = srcH;

  1348.     c->dstW      = dstW;

  1349.     c->dstH      = dstH;

  1350.     c->srcRange  = handle_jpeg(&srcFormat);

  1351.     c->dstRange  = handle_jpeg(&dstFormat);

  1352.     c->srcFormat = srcFormat;

  1353.     c->dstFormat = dstFormat;

  1354. 

  1355.     if (param) {

  1356.         c->param[0] = param[0];

  1357.         c->param[1] = param[1];

  1358.     }

  1359.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1360.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1361.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1362. 

  1363.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1364.         sws_freeContext(c);

  1365.         return NULL;

  1366.     }

  1367. 

  1368.     return c;

  1369. }

  1370. 

  1371. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1372.                                 float lumaSharpen, float chromaSharpen,

  1373.                                 float chromaHShift, float chromaVShift,

  1374.                                 int verbose)

  1375. {

  1376.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1377.     if (!filter)

  1378.         return NULL;

  1379. 

  1380.     if (lumaGBlur != 0.0) {

  1381.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1382.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1383.     } else {

  1384.         filter->lumH = sws_getIdentityVec();

  1385.         filter->lumV = sws_getIdentityVec();

  1386.     }

  1387. 

  1388.     if (chromaGBlur != 0.0) {

  1389.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1390.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1391.     } else {

  1392.         filter->chrH = sws_getIdentityVec();

  1393.         filter->chrV = sws_getIdentityVec();

  1394.     }

  1395. 

  1396.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1397.         goto fail;

  1398. 

  1399.     if (chromaSharpen != 0.0) {

  1400.         SwsVector *id = sws_getIdentityVec();

  1401.         if (!id)

  1402.             goto fail;

  1403.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1404.         sws_scaleVec(filter->chrV, -chromaSharpen);

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

  1406.         sws_addVec(filter->chrV, id);

  1407.         sws_freeVec(id);

  1408.     }

  1409. 

  1410.     if (lumaSharpen != 0.0) {

  1411.         SwsVector *id = sws_getIdentityVec();

  1412.         if (!id)

  1413.             goto fail;

  1414.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1415.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1416.         sws_addVec(filter->lumH, id);

  1417.         sws_addVec(filter->lumV, id);

  1418.         sws_freeVec(id);

  1419.     }

  1420. 

  1421.     if (chromaHShift != 0.0)

  1422.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1423. 

  1424.     if (chromaVShift != 0.0)

  1425.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1426. 

  1427.     sws_normalizeVec(filter->chrH, 1.0);

  1428.     sws_normalizeVec(filter->chrV, 1.0);

  1429.     sws_normalizeVec(filter->lumH, 1.0);

  1430.     sws_normalizeVec(filter->lumV, 1.0);

  1431. 

  1432.     if (verbose)

  1433.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1434.     if (verbose)

  1435.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1436. 

  1437.     return filter;

  1438. 

  1439. fail:

  1440.     sws_freeVec(filter->lumH);

  1441.     sws_freeVec(filter->lumV);

  1442.     sws_freeVec(filter->chrH);

  1443.     sws_freeVec(filter->chrV);

  1444.     av_freep(&filter);

  1445.     return NULL;

  1446. }

  1447. 

  1448. SwsVector *sws_allocVec(int length)

  1449. {

  1450.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1451.     if (!vec)

  1452.         return NULL;

  1453.     vec->length = length;

  1454.     vec->coeff  = av_malloc(sizeof(double) * length);

  1455.     if (!vec->coeff)

  1456.         av_freep(&vec);

  1457.     return vec;

  1458. }

  1459. 

  1460. SwsVector *sws_getGaussianVec(double variance, double quality)

  1461. {

  1462.     const int length = (int)(variance * quality + 0.5) | 1;

  1463.     int i;

  1464.     double middle  = (length - 1) * 0.5;

  1465.     SwsVector *vec = sws_allocVec(length);

  1466. 

  1467.     if (!vec)

  1468.         return NULL;

  1469. 

  1470.     for (i = 0; i < length; i++) {

  1471.         double dist = i - middle;

  1472.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1473.                         sqrt(2 * variance * M_PI);

  1474.     }

  1475. 

  1476.     sws_normalizeVec(vec, 1.0);

  1477. 

  1478.     return vec;

  1479. }

  1480. 

  1481. SwsVector *sws_getConstVec(double c, int length)

  1482. {

  1483.     int i;

  1484.     SwsVector *vec = sws_allocVec(length);

  1485. 

  1486.     if (!vec)

  1487.         return NULL;

  1488. 

  1489.     for (i = 0; i < length; i++)

  1490.         vec->coeff[i] = c;

  1491. 

  1492.     return vec;

  1493. }

  1494. 

  1495. SwsVector *sws_getIdentityVec(void)

  1496. {

  1497.     return sws_getConstVec(1.0, 1);

  1498. }

  1499. 

  1500. static double sws_dcVec(SwsVector *a)

  1501. {

  1502.     int i;

  1503.     double sum = 0;

  1504. 

  1505.     for (i = 0; i < a->length; i++)

  1506.         sum += a->coeff[i];

  1507. 

  1508.     return sum;

  1509. }

  1510. 

  1511. void sws_scaleVec(SwsVector *a, double scalar)

  1512. {

  1513.     int i;

  1514. 

  1515.     for (i = 0; i < a->length; i++)

  1516.         a->coeff[i] *= scalar;

  1517. }

  1518. 

  1519. void sws_normalizeVec(SwsVector *a, double height)

  1520. {

  1521.     sws_scaleVec(a, height / sws_dcVec(a));

  1522. }

  1523. 

  1524. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1525. {

  1526.     int length = a->length + b->length - 1;

  1527.     int i, j;

  1528.     SwsVector *vec = sws_getConstVec(0.0, length);

  1529. 

  1530.     if (!vec)

  1531.         return NULL;

  1532. 

  1533.     for (i = 0; i < a->length; i++) {

  1534.         for (j = 0; j < b->length; j++) {

  1535.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1536.         }

  1537.     }

  1538. 

  1539.     return vec;

  1540. }

  1541. 

  1542. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1543. {

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

  1545.     int i;

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

  1547. 

  1548.     if (!vec)

  1549.         return NULL;

  1550. 

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

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

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

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

  1555. 

  1556.     return vec;

  1557. }

  1558. 

  1559. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1560. {

  1561.     int length = FFMAX(a->length, b->length);

  1562.     int i;

  1563.     SwsVector *vec = sws_getConstVec(0.0, length);

  1564. 

  1565.     if (!vec)

  1566.         return NULL;

  1567. 

  1568.     for (i = 0; i < a->length; i++)

  1569.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1570.     for (i = 0; i < b->length; i++)

  1571.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1572. 

  1573.     return vec;

  1574. }

  1575. 

  1576. /* shift left / or right if "shift" is negative */

  1577. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1578. {

  1579.     int length = a->length + FFABS(shift) * 2;

  1580.     int i;

  1581.     SwsVector *vec = sws_getConstVec(0.0, length);

  1582. 

  1583.     if (!vec)

  1584.         return NULL;

  1585. 

  1586.     for (i = 0; i < a->length; i++) {

  1587.         vec->coeff[i + (length    - 1) / 2 -

  1588.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1589.     }

  1590. 

  1591.     return vec;

  1592. }

  1593. 

  1594. void sws_shiftVec(SwsVector *a, int shift)

  1595. {

  1596.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1597.     av_free(a->coeff);

  1598.     a->coeff  = shifted->coeff;

  1599.     a->length = shifted->length;

  1600.     av_free(shifted);

  1601. }

  1602. 

  1603. void sws_addVec(SwsVector *a, SwsVector *b)

  1604. {

  1605.     SwsVector *sum = sws_sumVec(a, b);

  1606.     av_free(a->coeff);

  1607.     a->coeff  = sum->coeff;

  1608.     a->length = sum->length;

  1609.     av_free(sum);

  1610. }

  1611. 

  1612. void sws_subVec(SwsVector *a, SwsVector *b)

  1613. {

  1614.     SwsVector *diff = sws_diffVec(a, b);

  1615.     av_free(a->coeff);

  1616.     a->coeff  = diff->coeff;

  1617.     a->length = diff->length;

  1618.     av_free(diff);

  1619. }

  1620. 

  1621. void sws_convVec(SwsVector *a, SwsVector *b)

  1622. {

  1623.     SwsVector *conv = sws_getConvVec(a, b);

  1624.     av_free(a->coeff);

  1625.     a->coeff  = conv->coeff;

  1626.     a->length = conv->length;

  1627.     av_free(conv);

  1628. }

  1629. 

  1630. SwsVector *sws_cloneVec(SwsVector *a)

  1631. {

  1632.     int i;

  1633.     SwsVector *vec = sws_allocVec(a->length);

  1634. 

  1635.     if (!vec)

  1636.         return NULL;

  1637. 

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

  1639.         vec->coeff[i] = a->coeff[i];

  1640. 

  1641.     return vec;

  1642. }

  1643. 

  1644. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1645. {

  1646.     int i;

  1647.     double max = 0;

  1648.     double min = 0;

  1649.     double range;

  1650. 

  1651.     for (i = 0; i < a->length; i++)

  1652.         if (a->coeff[i] > max)

  1653.             max = a->coeff[i];

  1654. 

  1655.     for (i = 0; i < a->length; i++)

  1656.         if (a->coeff[i] < min)

  1657.             min = a->coeff[i];

  1658. 

  1659.     range = max - min;

  1660. 

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

  1662.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1663.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1664.         for (; x > 0; x--)

  1665.             av_log(log_ctx, log_level, " ");

  1666.         av_log(log_ctx, log_level, "|\n");

  1667.     }

  1668. }

  1669. 

  1670. void sws_freeVec(SwsVector *a)

  1671. {

  1672.     if (!a)

  1673.         return;

  1674.     av_freep(&a->coeff);

  1675.     a->length = 0;

  1676.     av_free(a);

  1677. }

  1678. 

  1679. void sws_freeFilter(SwsFilter *filter)

  1680. {

  1681.     if (!filter)

  1682.         return;

  1683. 

  1684.     if (filter->lumH)

  1685.         sws_freeVec(filter->lumH);

  1686.     if (filter->lumV)

  1687.         sws_freeVec(filter->lumV);

  1688.     if (filter->chrH)

  1689.         sws_freeVec(filter->chrH);

  1690.     if (filter->chrV)

  1691.         sws_freeVec(filter->chrV);

  1692.     av_free(filter);

  1693. }

  1694. 

  1695. void sws_freeContext(SwsContext *c)

  1696. {

  1697.     int i;

  1698.     if (!c)

  1699.         return;

  1700. 

  1701.     if (c->lumPixBuf) {

  1702.         for (i = 0; i < c->vLumBufSize; i++)

  1703.             av_freep(&c->lumPixBuf[i]);

  1704.         av_freep(&c->lumPixBuf);

  1705.     }

  1706. 

  1707.     if (c->chrUPixBuf) {

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

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

  1710.         av_freep(&c->chrUPixBuf);

  1711.         av_freep(&c->chrVPixBuf);

  1712.     }

  1713. 

  1714.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1715.         for (i = 0; i < c->vLumBufSize; i++)

  1716.             av_freep(&c->alpPixBuf[i]);

  1717.         av_freep(&c->alpPixBuf);

  1718.     }

  1719. 

  1720.     av_freep(&c->vLumFilter);

  1721.     av_freep(&c->vChrFilter);

  1722.     av_freep(&c->hLumFilter);

  1723.     av_freep(&c->hChrFilter);

  1724. #if HAVE_ALTIVEC

  1725.     av_freep(&c->vYCoeffsBank);

  1726.     av_freep(&c->vCCoeffsBank);

  1727. #endif

  1728. 

  1729.     av_freep(&c->vLumFilterPos);

  1730.     av_freep(&c->vChrFilterPos);

  1731.     av_freep(&c->hLumFilterPos);

  1732.     av_freep(&c->hChrFilterPos);

  1733. 

  1734. #if HAVE_MMX_INLINE

  1735. #if USE_MMAP

  1736.     if (c->lumMmxextFilterCode)

  1737.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1738.     if (c->chrMmxextFilterCode)

  1739.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1740. #elif HAVE_VIRTUALALLOC

  1741.     if (c->lumMmxextFilterCode)

  1742.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1743.     if (c->chrMmxextFilterCode)

  1744.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1745. #else

  1746.     av_free(c->lumMmxextFilterCode);

  1747.     av_free(c->chrMmxextFilterCode);

  1748. #endif

  1749.     c->lumMmxextFilterCode = NULL;

  1750.     c->chrMmxextFilterCode = NULL;

  1751. #endif /* HAVE_MMX_INLINE */

  1752. 

  1753.     av_freep(&c->yuvTable);

  1754.     av_free(c->formatConvBuffer);

  1755. 

  1756.     av_free(c);

  1757. }

  1758. 

  1759. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1760.                                         int srcH, enum AVPixelFormat srcFormat,

  1761.                                         int dstW, int dstH,

  1762.                                         enum AVPixelFormat dstFormat, int flags,

  1763.                                         SwsFilter *srcFilter,

  1764.                                         SwsFilter *dstFilter,

  1765.                                         const double *param)

  1766. {

  1767.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1768.                                              SWS_PARAM_DEFAULT };

  1769. 

  1770.     if (!param)

  1771.         param = default_param;

  1772. 

  1773.     if (context &&

  1774.         (context->srcW      != srcW      ||

  1775.          context->srcH      != srcH      ||

  1776.          context->srcFormat != srcFormat ||

  1777.          context->dstW      != dstW      ||

  1778.          context->dstH      != dstH      ||

  1779.          context->dstFormat != dstFormat ||

  1780.          context->flags     != flags     ||

  1781.          context->param[0]  != param[0]  ||

  1782.          context->param[1]  != param[1])) {

  1783.         sws_freeContext(context);

  1784.         context = NULL;

  1785.     }

  1786. 

  1787.     if (!context) {

  1788.         if (!(context = sws_alloc_context()))

  1789.             return NULL;

  1790.         context->srcW      = srcW;

  1791.         context->srcH      = srcH;

  1792.         context->srcRange  = handle_jpeg(&srcFormat);

  1793.         context->srcFormat = srcFormat;

  1794.         context->dstW      = dstW;

  1795.         context->dstH      = dstH;

  1796.         context->dstRange  = handle_jpeg(&dstFormat);

  1797.         context->dstFormat = dstFormat;

  1798.         context->flags     = flags;

  1799.         context->param[0]  = param[0];

  1800.         context->param[1]  = param[1];

  1801.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1802.                                  context->srcRange,

  1803.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1804.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1805.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1806.             sws_freeContext(context);

  1807.             return NULL;

  1808.         }

  1809.     }

  1810.     return context;

  1811. }