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FFmpeg/libswscale/utils.c

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  1. /*

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

  3.  *

  4.  * This file is part of Libav.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #include <assert.h>

  25. #include <inttypes.h>

  26. #include <math.h>

  27. #include <stdio.h>

  28. #include <string.h>

  29. #if HAVE_SYS_MMAN_H

  30. #include <sys/mman.h>

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

  32. #define MAP_ANONYMOUS MAP_ANON

  33. #endif

  34. #endif

  35. #if HAVE_VIRTUALALLOC

  36. #define WIN32_LEAN_AND_MEAN

  37. #include <windows.h>

  38. #endif

  39. 

  40. #include "libavutil/attributes.h"

  41. #include "libavutil/avutil.h"

  42. #include "libavutil/bswap.h"

  43. #include "libavutil/cpu.h"

  44. #include "libavutil/intreadwrite.h"

  45. #include "libavutil/mathematics.h"

  46. #include "libavutil/opt.h"

  47. #include "libavutil/pixdesc.h"

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

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

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

  51. #include "rgb2rgb.h"

  52. #include "swscale.h"

  53. #include "swscale_internal.h"

  54. 

  55. unsigned swscale_version(void)

  56. {

  57.     return LIBSWSCALE_VERSION_INT;

  58. }

  59. 

  60. const char *swscale_configuration(void)

  61. {

  62.     return LIBAV_CONFIGURATION;

  63. }

  64. 

  65. const char *swscale_license(void)

  66. {

  67. #define LICENSE_PREFIX "libswscale license: "

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

  69. }

  70. 

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

  72. 

  73. typedef struct FormatEntry {

  74.     uint8_t is_supported_in         :1;

  75.     uint8_t is_supported_out        :1;

  76.     uint8_t is_supported_endianness :1;

  77. } FormatEntry;

  78. 

  79. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  157.     [AV_PIX_FMT_YA8]         = { 1, 0 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  200. };

  201. 

  202. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  203. {

  204.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  205.            format_entries[pix_fmt].is_supported_in : 0;

  206. }

  207. 

  208. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  209. {

  210.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  211.            format_entries[pix_fmt].is_supported_out : 0;

  212. }

  213. 

  214. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  215. {

  216.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  217.            format_entries[pix_fmt].is_supported_endianness : 0;

  218. }

  219. 

  220. const char *sws_format_name(enum AVPixelFormat format)

  221. {

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

  223.     if (desc)

  224.         return desc->name;

  225.     else

  226.         return "Unknown format";

  227. }

  228. 

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

  230.                              double dist)

  231. {

  232.     if (dist <= 1.0)

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

  234.     else

  235.         return getSplineCoeff(0.0,

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

  237.                                c + 3.0 * d,

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

  239.                               dist - 1.0);

  240. }

  241. 

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

  243.                               int *outFilterSize, int xInc, int srcW,

  244.                               int dstW, int filterAlign, int one,

  245.                               int flags, int cpu_flags,

  246.                               SwsVector *srcFilter, SwsVector *dstFilter,

  247.                               double param[2], int is_horizontal)

  248. {

  249.     int i;

  250.     int filterSize;

  251.     int filter2Size;

  252.     int minFilterSize;

  253.     int64_t *filter    = NULL;

  254.     int64_t *filter2   = NULL;

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

  256.     int ret            = -1;

  257. 

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

  259. 

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

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

  262. 

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

  264.         int i;

  265.         filterSize = 1;

  266.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  268. 

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

  270.             filter[i * filterSize] = fone;

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

  272.         }

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

  274.         int i;

  275.         int xDstInSrc;

  276.         filterSize = 1;

  277.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  279. 

  280.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  283. 

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

  285.             filter[i]       = fone;

  286.             xDstInSrc      += xInc;

  287.         }

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

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

  290.         int i;

  291.         int xDstInSrc;

  292.         filterSize = 2;

  293.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  295. 

  296.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  299.             int j;

  300. 

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

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

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

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

  305.                                 (fone >> 16);

  306.                 if (coeff < 0)

  307.                     coeff = 0;

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

  309.                 xx++;

  310.             }

  311.             xDstInSrc += xInc;

  312.         }

  313.     } else {

  314.         int64_t xDstInSrc;

  315.         int sizeFactor;

  316. 

  317.         if (flags & SWS_BICUBIC)

  318.             sizeFactor = 4;

  319.         else if (flags & SWS_X)

  320.             sizeFactor = 8;

  321.         else if (flags & SWS_AREA)

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

  323.         else if (flags & SWS_GAUSS)

  324.             sizeFactor = 8;     // infinite ;)

  325.         else if (flags & SWS_LANCZOS)

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

  327.         else if (flags & SWS_SINC)

  328.             sizeFactor = 20;    // infinite ;)

  329.         else if (flags & SWS_SPLINE)

  330.             sizeFactor = 20;    // infinite ;)

  331.         else if (flags & SWS_BILINEAR)

  332.             sizeFactor = 2;

  333.         else {

  334.             sizeFactor = 0;     // GCC warning killer

  335.             assert(0);

  336.         }

  337. 

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

  339.             filterSize = 1 + sizeFactor;    // upscale

  340.         else

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

  342. 

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

  344.         filterSize = FFMAX(filterSize, 1);

  345. 

  346.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  348. 

  349.         xDstInSrc = xInc - 0x10000;

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

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

  352.             int j;

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

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

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

  356.                 double floatd;

  357.                 int64_t coeff;

  358. 

  359.                 if (xInc > 1 << 16)

  360.                     d = d * dstW / srcW;

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

  362. 

  363.                 if (flags & SWS_BICUBIC) {

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

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

  366. 

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

  368.                         coeff = 0.0;

  369.                     } else {

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

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

  372. 

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

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

  375.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  376.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  377.                         else

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

  379.                                       (6 * B + 30 * C) * dd  +

  380.                                     (-12 * B - 48 * C) * d   +

  381.                                       (8 * B + 24 * C) * (1 << 30);

  382.                     }

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

  384.                 }

  385.                 else if (flags & SWS_X) {

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

  387.                     double c;

  388. 

  389.                     if (floatd < 1.0)

  390.                         c = cos(floatd * M_PI);

  391.                     else

  392.                         c = -1.0;

  393.                     if (c < 0.0)

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

  395.                     else

  396.                         c = pow(c, A);

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

  398.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  404.                     else

  405.                         coeff = 0.0;

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

  407.                 } else if (flags & SWS_GAUSS) {

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

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

  410.                 } else if (flags & SWS_SINC) {

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

  412.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  416.                     if (floatd > p)

  417.                         coeff = 0;

  418.                 } else if (flags & SWS_BILINEAR) {

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

  420.                     if (coeff < 0)

  421.                         coeff = 0;

  422.                     coeff *= fone >> 30;

  423.                 } else if (flags & SWS_SPLINE) {

  424.                     double p = -2.196152422706632;

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

  426.                 } else {

  427.                     coeff = 0.0; // GCC warning killer

  428.                     assert(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.     assert(filterSize > 0);

  442.     filter2Size = filterSize;

  443.     if (srcFilter)

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

  445.     if (dstFilter)

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

  447.     assert(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 (PPC_ALTIVEC(cpu_flags)) {

  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.     assert(minFilterSize > 0);

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

  531.     assert(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.         goto fail;

  536.     *outFilterSize = filterSize;

  537. 

  538.     if (flags & SWS_PRINT_INFO)

  539.         av_log(NULL, AV_LOG_VERBOSE,

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

  541.                filter2Size, filterSize);

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

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

  544.         int j;

  545. 

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

  547.             if (j >= filter2Size)

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

  549.             else

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

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

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

  553.         }

  554.     }

  555. 

  556.     // FIXME try to align filterPos if possible

  557. 

  558.     // fix borders

  559.     if (is_horizontal) {

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

  561.             int j;

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

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

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

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

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

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

  568.                 }

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

  570.             }

  571. 

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

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

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

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

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

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

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

  579.                 }

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

  581.             }

  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.     av_free(filter);

  623.     av_free(filter2);

  624.     return ret;

  625. }

  626. 

  627. #if HAVE_MMXEXT_INLINE

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

  629.                                        int16_t *filter, int32_t *filterPos,

  630.                                        int numSplits)

  631. {

  632.     uint8_t *fragmentA;

  633.     x86_reg imm8OfPShufW1A;

  634.     x86_reg imm8OfPShufW2A;

  635.     x86_reg fragmentLengthA;

  636.     uint8_t *fragmentB;

  637.     x86_reg imm8OfPShufW1B;

  638.     x86_reg imm8OfPShufW2B;

  639.     x86_reg fragmentLengthB;

  640.     int fragmentPos;

  641. 

  642.     int xpos, i;

  643. 

  644.     // create an optimized horizontal scaling routine

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

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

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

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

  649.      */

  650. 

  651.     // code fragment

  652. 

  653.     __asm__ volatile (

  654.         "jmp                         9f                 \n\t"

  655.         // Begin

  656.         "0:                                             \n\t"

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

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

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

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

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

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

  663.         "1:                                             \n\t"

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

  665.         "2:                                             \n\t"

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

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

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

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

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

  671. 

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

  673. 

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

  675.         // End

  676.         "9:                                             \n\t"

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

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

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

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

  681.         "dec                         %1                 \n\t"

  682.         "dec                         %2                 \n\t"

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

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

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

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

  687. 

  688. 

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

  690.           "=r" (fragmentLengthA)

  691.         );

  692. 

  693.     __asm__ volatile (

  694.         "jmp                         9f                 \n\t"

  695.         // Begin

  696.         "0:                                             \n\t"

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

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

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

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

  701.         "1:                                             \n\t"

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

  703.         "2:                                             \n\t"

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

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

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

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

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

  709. 

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

  711. 

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

  713.         // End

  714.         "9:                                             \n\t"

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

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

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

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

  719.         "dec                         %1                 \n\t"

  720.         "dec                         %2                 \n\t"

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

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

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

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

  725. 

  726. 

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

  728.           "=r" (fragmentLengthB)

  729.         );

  730. 

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

  732.     fragmentPos = 0;

  733. 

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

  735.         int xx = xpos >> 16;

  736. 

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

  738.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  748.             int shift              = 0;

  749. 

  750.             if (filterCode) {

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

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

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

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

  755.                 filterPos[i / 2] = xx;

  756. 

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

  758. 

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

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

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

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

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

  764.                                                                (c << 4) |

  765.                                                                (d << 6);

  766. 

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

  768.                     shift = maxShift;               // avoid overread

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

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

  771. 

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

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

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

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

  776.                 }

  777.             }

  778. 

  779.             fragmentPos += fragmentLength;

  780. 

  781.             if (filterCode)

  782.                 filterCode[fragmentPos] = RET;

  783.         }

  784.         xpos += xInc;

  785.     }

  786.     if (filterCode)

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

  788. 

  789.     return fragmentPos + 1;

  790. }

  791. #endif /* HAVE_MMXEXT_INLINE */

  792. 

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

  794. {

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

  796.     *h = desc->log2_chroma_w;

  797.     *v = desc->log2_chroma_h;

  798. }

  799. 

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

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

  802.                              int brightness, int contrast, int saturation)

  803. {

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

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

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

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

  808. 

  809.     c->brightness = brightness;

  810.     c->contrast   = contrast;

  811.     c->saturation = saturation;

  812.     c->srcRange   = srcRange;

  813.     c->dstRange   = dstRange;

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

  815.         return -1;

  816. 

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

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

  819. 

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

  821.                              contrast, saturation);

  822.     // FIXME factorize

  823. 

  824.     if (ARCH_PPC)

  825.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  826.                                    contrast, saturation);

  827.     return 0;

  828. }

  829. 

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

  831.                              int *srcRange, int **table, int *dstRange,

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

  833. {

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

  835.         return -1;

  836. 

  837.     *inv_table  = c->srcColorspaceTable;

  838.     *table      = c->dstColorspaceTable;

  839.     *srcRange   = c->srcRange;

  840.     *dstRange   = c->dstRange;

  841.     *brightness = c->brightness;

  842.     *contrast   = c->contrast;

  843.     *saturation = c->saturation;

  844. 

  845.     return 0;

  846. }

  847. 

  848. static int handle_jpeg(enum AVPixelFormat *format)

  849. {

  850.     switch (*format) {

  851.     case AV_PIX_FMT_YUVJ420P:

  852.         *format = AV_PIX_FMT_YUV420P;

  853.         return 1;

  854.     case AV_PIX_FMT_YUVJ422P:

  855.         *format = AV_PIX_FMT_YUV422P;

  856.         return 1;

  857.     case AV_PIX_FMT_YUVJ444P:

  858.         *format = AV_PIX_FMT_YUV444P;

  859.         return 1;

  860.     case AV_PIX_FMT_YUVJ440P:

  861.         *format = AV_PIX_FMT_YUV440P;

  862.         return 1;

  863.     default:

  864.         return 0;

  865.     }

  866. }

  867. 

  868. SwsContext *sws_alloc_context(void)

  869. {

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

  871. 

  872.     if (c) {

  873.         c->av_class = &ff_sws_context_class;

  874.         av_opt_set_defaults(c);

  875.     }

  876. 

  877.     return c;

  878. }

  879. 

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

  881.                              SwsFilter *dstFilter)

  882. {

  883.     int i;

  884.     int usesVFilter, usesHFilter;

  885.     int unscaled;

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

  887.     int srcW              = c->srcW;

  888.     int srcH              = c->srcH;

  889.     int dstW              = c->dstW;

  890.     int dstH              = c->dstH;

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

  892.     int dst_stride_px     = dst_stride >> 1;

  893.     int flags, cpu_flags;

  894.     enum AVPixelFormat srcFormat = c->srcFormat;

  895.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  898. 

  899.     cpu_flags = av_get_cpu_flags();

  900.     flags     = c->flags;

  901.     emms_c();

  902.     if (!rgb15to16)

  903.         ff_rgb2rgb_init();

  904. 

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

  906. 

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

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

  909.     if (!sws_isSupportedInput(srcFormat)) {

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

  911.                sws_format_name(srcFormat));

  912.         return AVERROR(EINVAL);

  913.     }

  914.     if (!sws_isSupportedOutput(dstFormat)) {

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

  916.                sws_format_name(dstFormat));

  917.         return AVERROR(EINVAL);

  918.     }

  919.     }

  920. 

  921.     i = flags & (SWS_POINT         |

  922.                  SWS_AREA          |

  923.                  SWS_BILINEAR      |

  924.                  SWS_FAST_BILINEAR |

  925.                  SWS_BICUBIC       |

  926.                  SWS_X             |

  927.                  SWS_GAUSS         |

  928.                  SWS_LANCZOS       |

  929.                  SWS_SINC          |

  930.                  SWS_SPLINE        |

  931.                  SWS_BICUBLIN);

  932. 

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

  934.     if (!i) {

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

  936.             flags |= SWS_GAUSS;

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

  938.             flags |= SWS_SINC;

  939.         else

  940.             flags |= SWS_LANCZOS;

  941.         c->flags = flags;

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

  943.         av_log(c, AV_LOG_ERROR,

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

  945.         return AVERROR(EINVAL);

  946.     }

  947.     /* sanity check */

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

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

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

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

  952.                srcW, srcH, dstW, dstH);

  953.         return AVERROR(EINVAL);

  954.     }

  955. 

  956.     if (!dstFilter)

  957.         dstFilter = &dummyFilter;

  958.     if (!srcFilter)

  959.         srcFilter = &dummyFilter;

  960. 

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

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

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

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

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

  966. 

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

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

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

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

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

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

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

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

  975. 

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

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

  978. 

  979.     if (isPlanarRGB(dstFormat)) {

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

  981.             av_log(c, AV_LOG_DEBUG,

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

  983.                    av_get_pix_fmt_name(dstFormat));

  984.             flags   |= SWS_FULL_CHR_H_INT;

  985.             c->flags = flags;

  986.         }

  987.     }

  988. 

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

  990.      * chroma interpolation */

  991.     if (flags & SWS_FULL_CHR_H_INT &&

  992.         isAnyRGB(dstFormat)        &&

  993.         !isPlanarRGB(dstFormat)    &&

  994.         dstFormat != AV_PIX_FMT_RGBA  &&

  995.         dstFormat != AV_PIX_FMT_ARGB  &&

  996.         dstFormat != AV_PIX_FMT_BGRA  &&

  997.         dstFormat != AV_PIX_FMT_ABGR  &&

  998.         dstFormat != AV_PIX_FMT_RGB24 &&

  999.         dstFormat != AV_PIX_FMT_BGR24) {

  1000.         av_log(c, AV_LOG_ERROR,

  1001.                "full chroma interpolation for destination format '%s' not yet implemented\n",

  1002.                sws_format_name(dstFormat));

  1003.         flags   &= ~SWS_FULL_CHR_H_INT;

  1004.         c->flags = flags;

  1005.     }

  1006.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1007.         c->chrDstHSubSample = 1;

  1008. 

  1009.     // drop some chroma lines if the user wants it

  1010.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1011.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1012.     c->chrSrcVSubSample += c->vChrDrop;

  1013. 

  1014.     /* drop every other pixel for chroma calculation unless user

  1015.      * wants full chroma */

  1016.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1017.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1018.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1019.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1020.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1021.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1022.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1023.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1024.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1025.          (flags & SWS_FAST_BILINEAR)))

  1026.         c->chrSrcHSubSample = 1;

  1027. 

  1028.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1029.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1030.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1031.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1032.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1033. 

  1034.     /* unscaled special cases */

  1035.     if (unscaled && !usesHFilter && !usesVFilter &&

  1036.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1037.         ff_get_unscaled_swscale(c);

  1038. 

  1039.         if (c->swscale) {

  1040.             if (flags & SWS_PRINT_INFO)

  1041.                 av_log(c, AV_LOG_INFO,

  1042.                        "using unscaled %s -> %s special converter\n",

  1043.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1044.             return 0;

  1045.         }

  1046.     }

  1047. 

  1048.     c->srcBpc = desc_src->comp[0].depth;

  1049.     if (c->srcBpc < 8)

  1050.         c->srcBpc = 8;

  1051.     c->dstBpc = desc_dst->comp[0].depth;

  1052.     if (c->dstBpc < 8)

  1053.         c->dstBpc = 8;

  1054.     if (c->dstBpc == 16)

  1055.         dst_stride <<= 1;

  1056.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1057.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1058.                      fail);

  1059.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 12) {

  1060.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1061.                               (srcW & 15) == 0) ? 1 : 0;

  1062.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1063.             && (flags & SWS_FAST_BILINEAR)) {

  1064.             if (flags & SWS_PRINT_INFO)

  1065.                 av_log(c, AV_LOG_INFO,

  1066.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1067.         }

  1068.         if (usesHFilter)

  1069.             c->canMMXEXTBeUsed = 0;

  1070.     } else

  1071.         c->canMMXEXTBeUsed = 0;

  1072. 

  1073.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1074.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1075. 

  1076.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1077.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1078.      * correct scaling.

  1079.      * n-2 is the last chrominance sample available.

  1080.      * This is not perfect, but no one should notice the difference, the more

  1081.      * correct variant would be like the vertical one, but that would require

  1082.      * some special code for the first and last pixel */

  1083.     if (flags & SWS_FAST_BILINEAR) {

  1084.         if (c->canMMXEXTBeUsed) {

  1085.             c->lumXInc += 20;

  1086.             c->chrXInc += 20;

  1087.         }

  1088.         // we don't use the x86 asm scaler if MMX is available

  1089.         else if (INLINE_MMX(cpu_flags)) {

  1090.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1091.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1092.         }

  1093.     }

  1094. 

  1095. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1096. 

  1097.     /* precalculate horizontal scaler filter coefficients */

  1098.     {

  1099. #if HAVE_MMXEXT_INLINE

  1100. // can't downscale !!!

  1101.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1102.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1103.                                                              NULL, NULL, 8);

  1104.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1105.                                                              NULL, NULL, NULL, 4);

  1106. 

  1107. #if USE_MMAP

  1108.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1109.                                           PROT_READ | PROT_WRITE,

  1110.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1111.                                           -1, 0);

  1112.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1113.                                           PROT_READ | PROT_WRITE,

  1114.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1115.                                           -1, 0);

  1116. #elif HAVE_VIRTUALALLOC

  1117.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1118.                                                   c->lumMmxextFilterCodeSize,

  1119.                                                   MEM_COMMIT,

  1120.                                                   PAGE_EXECUTE_READWRITE);

  1121.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1122.                                                   c->chrMmxextFilterCodeSize,

  1123.                                                   MEM_COMMIT,

  1124.                                                   PAGE_EXECUTE_READWRITE);

  1125. #else

  1126.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1127.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1128. #endif

  1129. 

  1130.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1131.                 return AVERROR(ENOMEM);

  1132.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1133.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1134.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1135.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1136. 

  1137.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1138.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1139.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1140.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1141. 

  1142. #if USE_MMAP

  1143.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1144.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1145. #endif

  1146.         } else

  1147. #endif /* HAVE_MMXEXT_INLINE */

  1148.         {

  1149.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1150.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1151. 

  1152.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1153.                            &c->hLumFilterSize, c->lumXInc,

  1154.                            srcW, dstW, filterAlign, 1 << 14,

  1155.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1156.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1157.                            c->param, 1) < 0)

  1158.                 goto fail;

  1159.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1160.                            &c->hChrFilterSize, c->chrXInc,

  1161.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1162.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1163.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1164.                            c->param, 1) < 0)

  1165.                 goto fail;

  1166.         }

  1167.     } // initialize horizontal stuff

  1168. 

  1169.     /* precalculate vertical scaler filter coefficients */

  1170.     {

  1171.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1172.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1173. 

  1174.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1175.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1176.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1177.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1178.                        c->param, 0) < 0)

  1179.             goto fail;

  1180.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1181.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1182.                        filterAlign, (1 << 12),

  1183.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1184.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1185.                        c->param, 0) < 0)

  1186.             goto fail;

  1187. 

  1188. #if HAVE_ALTIVEC

  1189.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1190.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1191. 

  1192.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1193.             int j;

  1194.             short *p = (short *)&c->vYCoeffsBank[i];

  1195.             for (j = 0; j < 8; j++)

  1196.                 p[j] = c->vLumFilter[i];

  1197.         }

  1198. 

  1199.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1200.             int j;

  1201.             short *p = (short *)&c->vCCoeffsBank[i];

  1202.             for (j = 0; j < 8; j++)

  1203.                 p[j] = c->vChrFilter[i];

  1204.         }

  1205. #endif

  1206.     }

  1207. 

  1208.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1209.     c->vLumBufSize = c->vLumFilterSize;

  1210.     c->vChrBufSize = c->vChrFilterSize;

  1211.     for (i = 0; i < dstH; i++) {

  1212.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1213.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1214.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1215.                                << c->chrSrcVSubSample));

  1216. 

  1217.         nextSlice >>= c->chrSrcVSubSample;

  1218.         nextSlice <<= c->chrSrcVSubSample;

  1219.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1220.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1221.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1222.             (nextSlice >> c->chrSrcVSubSample))

  1223.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1224.                              c->vChrFilterPos[chrI];

  1225.     }

  1226. 

  1227.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1228.      * need to allocate several megabytes to handle all possible cases) */

  1229.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1230.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1231.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1232.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1233.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1234.     /* Note we need at least one pixel more at the end because of the MMX code

  1235.      * (just in case someone wants to replace the 4000/8000). */

  1236.     /* align at 16 bytes for AltiVec */

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

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

  1239.                           dst_stride + 16, fail);

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

  1241.     }

  1242.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1243.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1244.     c->uv_off_byte = dst_stride + 16;

  1245.     for (i = 0; i < c->vChrBufSize; i++) {

  1246.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1247.                          dst_stride * 2 + 32, fail);

  1248.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1249.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1250.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1251.     }

  1252.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1253.         for (i = 0; i < c->vLumBufSize; i++) {

  1254.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1255.                               dst_stride + 16, fail);

  1256.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1257.         }

  1258. 

  1259.     // try to avoid drawing green stuff between the right end and the stride end

  1260.     for (i = 0; i < c->vChrBufSize; i++)

  1261.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1262. 

  1263.     assert(c->chrDstH <= dstH);

  1264. 

  1265.     if (flags & SWS_PRINT_INFO) {

  1266.         if (flags & SWS_FAST_BILINEAR)

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

  1268.         else if (flags & SWS_BILINEAR)

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

  1270.         else if (flags & SWS_BICUBIC)

  1271.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1272.         else if (flags & SWS_X)

  1273.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1274.         else if (flags & SWS_POINT)

  1275.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1276.         else if (flags & SWS_AREA)

  1277.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1278.         else if (flags & SWS_BICUBLIN)

  1279.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1280.         else if (flags & SWS_GAUSS)

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

  1282.         else if (flags & SWS_SINC)

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

  1284.         else if (flags & SWS_LANCZOS)

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

  1286.         else if (flags & SWS_SPLINE)

  1287.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1288.         else

  1289.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1290. 

  1291.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1292.                sws_format_name(srcFormat),

  1293. #ifdef DITHER1XBPP

  1294.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1295.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1296.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1297.                                                              "dithered " : "",

  1298. #else

  1299.                "",

  1300. #endif

  1301.                sws_format_name(dstFormat));

  1302. 

  1303.         if (INLINE_MMXEXT(cpu_flags))

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

  1305.         else if (INLINE_AMD3DNOW(cpu_flags))

  1306.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1307.         else if (INLINE_MMX(cpu_flags))

  1308.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1309.         else if (PPC_ALTIVEC(cpu_flags))

  1310.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1311.         else

  1312.             av_log(c, AV_LOG_INFO, "using C\n");

  1313. 

  1314.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1315.         av_log(c, AV_LOG_DEBUG,

  1316.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1317.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1318.         av_log(c, AV_LOG_DEBUG,

  1319.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1320.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1321.                c->chrXInc, c->chrYInc);

  1322.     }

  1323. 

  1324.     c->swscale = ff_getSwsFunc(c);

  1325.     return 0;

  1326. fail: // FIXME replace things by appropriate error codes

  1327.     return -1;

  1328. }

  1329. 

  1330. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1331.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1332.                            int flags, SwsFilter *srcFilter,

  1333.                            SwsFilter *dstFilter, const double *param)

  1334. {

  1335.     SwsContext *c;

  1336. 

  1337.     if (!(c = sws_alloc_context()))

  1338.         return NULL;

  1339. 

  1340.     c->flags     = flags;

  1341.     c->srcW      = srcW;

  1342.     c->srcH      = srcH;

  1343.     c->dstW      = dstW;

  1344.     c->dstH      = dstH;

  1345.     c->srcRange  = handle_jpeg(&srcFormat);

  1346.     c->dstRange  = handle_jpeg(&dstFormat);

  1347.     c->srcFormat = srcFormat;

  1348.     c->dstFormat = dstFormat;

  1349. 

  1350.     if (param) {

  1351.         c->param[0] = param[0];

  1352.         c->param[1] = param[1];

  1353.     }

  1354.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1355.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1356.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1357. 

  1358.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1359.         sws_freeContext(c);

  1360.         return NULL;

  1361.     }

  1362. 

  1363.     return c;

  1364. }

  1365. 

  1366. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1367.                                 float lumaSharpen, float chromaSharpen,

  1368.                                 float chromaHShift, float chromaVShift,

  1369.                                 int verbose)

  1370. {

  1371.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1372.     if (!filter)

  1373.         return NULL;

  1374. 

  1375.     if (lumaGBlur != 0.0) {

  1376.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1377.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1378.     } else {

  1379.         filter->lumH = sws_getIdentityVec();

  1380.         filter->lumV = sws_getIdentityVec();

  1381.     }

  1382. 

  1383.     if (chromaGBlur != 0.0) {

  1384.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1385.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1386.     } else {

  1387.         filter->chrH = sws_getIdentityVec();

  1388.         filter->chrV = sws_getIdentityVec();

  1389.     }

  1390. 

  1391.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1392.         goto fail;

  1393. 

  1394.     if (chromaSharpen != 0.0) {

  1395.         SwsVector *id = sws_getIdentityVec();

  1396.         if (!id)

  1397.             goto fail;

  1398.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1399.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1400.         sws_addVec(filter->chrH, id);

  1401.         sws_addVec(filter->chrV, id);

  1402.         sws_freeVec(id);

  1403.     }

  1404. 

  1405.     if (lumaSharpen != 0.0) {

  1406.         SwsVector *id = sws_getIdentityVec();

  1407.         if (!id)

  1408.             goto fail;

  1409.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1410.         sws_scaleVec(filter->lumV, -lumaSharpen);

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

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

  1413.         sws_freeVec(id);

  1414.     }

  1415. 

  1416.     if (chromaHShift != 0.0)

  1417.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1418. 

  1419.     if (chromaVShift != 0.0)

  1420.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1421. 

  1422.     sws_normalizeVec(filter->chrH, 1.0);

  1423.     sws_normalizeVec(filter->chrV, 1.0);

  1424.     sws_normalizeVec(filter->lumH, 1.0);

  1425.     sws_normalizeVec(filter->lumV, 1.0);

  1426. 

  1427.     if (verbose)

  1428.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1429.     if (verbose)

  1430.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1431. 

  1432.     return filter;

  1433. 

  1434. fail:

  1435.     sws_freeVec(filter->lumH);

  1436.     sws_freeVec(filter->lumV);

  1437.     sws_freeVec(filter->chrH);

  1438.     sws_freeVec(filter->chrV);

  1439.     av_freep(&filter);

  1440.     return NULL;

  1441. }

  1442. 

  1443. SwsVector *sws_allocVec(int length)

  1444. {

  1445.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1446.     if (!vec)

  1447.         return NULL;

  1448.     vec->length = length;

  1449.     vec->coeff  = av_malloc(sizeof(double) * length);

  1450.     if (!vec->coeff)

  1451.         av_freep(&vec);

  1452.     return vec;

  1453. }

  1454. 

  1455. SwsVector *sws_getGaussianVec(double variance, double quality)

  1456. {

  1457.     const int length = (int)(variance * quality + 0.5) | 1;

  1458.     int i;

  1459.     double middle  = (length - 1) * 0.5;

  1460.     SwsVector *vec = sws_allocVec(length);

  1461. 

  1462.     if (!vec)

  1463.         return NULL;

  1464. 

  1465.     for (i = 0; i < length; i++) {

  1466.         double dist = i - middle;

  1467.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1468.                         sqrt(2 * variance * M_PI);

  1469.     }

  1470. 

  1471.     sws_normalizeVec(vec, 1.0);

  1472. 

  1473.     return vec;

  1474. }

  1475. 

  1476. SwsVector *sws_getConstVec(double c, int length)

  1477. {

  1478.     int i;

  1479.     SwsVector *vec = sws_allocVec(length);

  1480. 

  1481.     if (!vec)

  1482.         return NULL;

  1483. 

  1484.     for (i = 0; i < length; i++)

  1485.         vec->coeff[i] = c;

  1486. 

  1487.     return vec;

  1488. }

  1489. 

  1490. SwsVector *sws_getIdentityVec(void)

  1491. {

  1492.     return sws_getConstVec(1.0, 1);

  1493. }

  1494. 

  1495. static double sws_dcVec(SwsVector *a)

  1496. {

  1497.     int i;

  1498.     double sum = 0;

  1499. 

  1500.     for (i = 0; i < a->length; i++)

  1501.         sum += a->coeff[i];

  1502. 

  1503.     return sum;

  1504. }

  1505. 

  1506. void sws_scaleVec(SwsVector *a, double scalar)

  1507. {

  1508.     int i;

  1509. 

  1510.     for (i = 0; i < a->length; i++)

  1511.         a->coeff[i] *= scalar;

  1512. }

  1513. 

  1514. void sws_normalizeVec(SwsVector *a, double height)

  1515. {

  1516.     sws_scaleVec(a, height / sws_dcVec(a));

  1517. }

  1518. 

  1519. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1520. {

  1521.     int length = a->length + b->length - 1;

  1522.     int i, j;

  1523.     SwsVector *vec = sws_getConstVec(0.0, length);

  1524. 

  1525.     if (!vec)

  1526.         return NULL;

  1527. 

  1528.     for (i = 0; i < a->length; i++) {

  1529.         for (j = 0; j < b->length; j++) {

  1530.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1531.         }

  1532.     }

  1533. 

  1534.     return vec;

  1535. }

  1536. 

  1537. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1538. {

  1539.     int length = FFMAX(a->length, b->length);

  1540.     int i;

  1541.     SwsVector *vec = sws_getConstVec(0.0, length);

  1542. 

  1543.     if (!vec)

  1544.         return NULL;

  1545. 

  1546.     for (i = 0; i < a->length; i++)

  1547.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1548.     for (i = 0; i < b->length; i++)

  1549.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1550. 

  1551.     return vec;

  1552. }

  1553. 

  1554. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1555. {

  1556.     int length = FFMAX(a->length, b->length);

  1557.     int i;

  1558.     SwsVector *vec = sws_getConstVec(0.0, length);

  1559. 

  1560.     if (!vec)

  1561.         return NULL;

  1562. 

  1563.     for (i = 0; i < a->length; i++)

  1564.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1565.     for (i = 0; i < b->length; i++)

  1566.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1567. 

  1568.     return vec;

  1569. }

  1570. 

  1571. /* shift left / or right if "shift" is negative */

  1572. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1573. {

  1574.     int length = a->length + FFABS(shift) * 2;

  1575.     int i;

  1576.     SwsVector *vec = sws_getConstVec(0.0, length);

  1577. 

  1578.     if (!vec)

  1579.         return NULL;

  1580. 

  1581.     for (i = 0; i < a->length; i++) {

  1582.         vec->coeff[i + (length    - 1) / 2 -

  1583.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1584.     }

  1585. 

  1586.     return vec;

  1587. }

  1588. 

  1589. void sws_shiftVec(SwsVector *a, int shift)

  1590. {

  1591.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1592.     av_free(a->coeff);

  1593.     a->coeff  = shifted->coeff;

  1594.     a->length = shifted->length;

  1595.     av_free(shifted);

  1596. }

  1597. 

  1598. void sws_addVec(SwsVector *a, SwsVector *b)

  1599. {

  1600.     SwsVector *sum = sws_sumVec(a, b);

  1601.     av_free(a->coeff);

  1602.     a->coeff  = sum->coeff;

  1603.     a->length = sum->length;

  1604.     av_free(sum);

  1605. }

  1606. 

  1607. void sws_subVec(SwsVector *a, SwsVector *b)

  1608. {

  1609.     SwsVector *diff = sws_diffVec(a, b);

  1610.     av_free(a->coeff);

  1611.     a->coeff  = diff->coeff;

  1612.     a->length = diff->length;

  1613.     av_free(diff);

  1614. }

  1615. 

  1616. void sws_convVec(SwsVector *a, SwsVector *b)

  1617. {

  1618.     SwsVector *conv = sws_getConvVec(a, b);

  1619.     av_free(a->coeff);

  1620.     a->coeff  = conv->coeff;

  1621.     a->length = conv->length;

  1622.     av_free(conv);

  1623. }

  1624. 

  1625. SwsVector *sws_cloneVec(SwsVector *a)

  1626. {

  1627.     int i;

  1628.     SwsVector *vec = sws_allocVec(a->length);

  1629. 

  1630.     if (!vec)

  1631.         return NULL;

  1632. 

  1633.     for (i = 0; i < a->length; i++)

  1634.         vec->coeff[i] = a->coeff[i];

  1635. 

  1636.     return vec;

  1637. }

  1638. 

  1639. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1640. {

  1641.     int i;

  1642.     double max = 0;

  1643.     double min = 0;

  1644.     double range;

  1645. 

  1646.     for (i = 0; i < a->length; i++)

  1647.         if (a->coeff[i] > max)

  1648.             max = a->coeff[i];

  1649. 

  1650.     for (i = 0; i < a->length; i++)

  1651.         if (a->coeff[i] < min)

  1652.             min = a->coeff[i];

  1653. 

  1654.     range = max - min;

  1655. 

  1656.     for (i = 0; i < a->length; i++) {

  1657.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1658.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1659.         for (; x > 0; x--)

  1660.             av_log(log_ctx, log_level, " ");

  1661.         av_log(log_ctx, log_level, "|\n");

  1662.     }

  1663. }

  1664. 

  1665. void sws_freeVec(SwsVector *a)

  1666. {

  1667.     if (!a)

  1668.         return;

  1669.     av_freep(&a->coeff);

  1670.     a->length = 0;

  1671.     av_free(a);

  1672. }

  1673. 

  1674. void sws_freeFilter(SwsFilter *filter)

  1675. {

  1676.     if (!filter)

  1677.         return;

  1678. 

  1679.     if (filter->lumH)

  1680.         sws_freeVec(filter->lumH);

  1681.     if (filter->lumV)

  1682.         sws_freeVec(filter->lumV);

  1683.     if (filter->chrH)

  1684.         sws_freeVec(filter->chrH);

  1685.     if (filter->chrV)

  1686.         sws_freeVec(filter->chrV);

  1687.     av_free(filter);

  1688. }

  1689. 

  1690. void sws_freeContext(SwsContext *c)

  1691. {

  1692.     int i;

  1693.     if (!c)

  1694.         return;

  1695. 

  1696.     if (c->lumPixBuf) {

  1697.         for (i = 0; i < c->vLumBufSize; i++)

  1698.             av_freep(&c->lumPixBuf[i]);

  1699.         av_freep(&c->lumPixBuf);

  1700.     }

  1701. 

  1702.     if (c->chrUPixBuf) {

  1703.         for (i = 0; i < c->vChrBufSize; i++)

  1704.             av_freep(&c->chrUPixBuf[i]);

  1705.         av_freep(&c->chrUPixBuf);

  1706.         av_freep(&c->chrVPixBuf);

  1707.     }

  1708. 

  1709.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1710.         for (i = 0; i < c->vLumBufSize; i++)

  1711.             av_freep(&c->alpPixBuf[i]);

  1712.         av_freep(&c->alpPixBuf);

  1713.     }

  1714. 

  1715.     av_freep(&c->vLumFilter);

  1716.     av_freep(&c->vChrFilter);

  1717.     av_freep(&c->hLumFilter);

  1718.     av_freep(&c->hChrFilter);

  1719. #if HAVE_ALTIVEC

  1720.     av_freep(&c->vYCoeffsBank);

  1721.     av_freep(&c->vCCoeffsBank);

  1722. #endif

  1723. 

  1724.     av_freep(&c->vLumFilterPos);

  1725.     av_freep(&c->vChrFilterPos);

  1726.     av_freep(&c->hLumFilterPos);

  1727.     av_freep(&c->hChrFilterPos);

  1728. 

  1729. #if HAVE_MMX_INLINE

  1730. #if USE_MMAP

  1731.     if (c->lumMmxextFilterCode)

  1732.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1733.     if (c->chrMmxextFilterCode)

  1734.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1735. #elif HAVE_VIRTUALALLOC

  1736.     if (c->lumMmxextFilterCode)

  1737.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1738.     if (c->chrMmxextFilterCode)

  1739.         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

  1740. #else

  1741.     av_free(c->lumMmxextFilterCode);

  1742.     av_free(c->chrMmxextFilterCode);

  1743. #endif

  1744.     c->lumMmxextFilterCode = NULL;

  1745.     c->chrMmxextFilterCode = NULL;

  1746. #endif /* HAVE_MMX_INLINE */

  1747. 

  1748.     av_freep(&c->yuvTable);

  1749.     av_free(c->formatConvBuffer);

  1750. 

  1751.     av_free(c);

  1752. }

  1753. 

  1754. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1755.                                         int srcH, enum AVPixelFormat srcFormat,

  1756.                                         int dstW, int dstH,

  1757.                                         enum AVPixelFormat dstFormat, int flags,

  1758.                                         SwsFilter *srcFilter,

  1759.                                         SwsFilter *dstFilter,

  1760.                                         const double *param)

  1761. {

  1762.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1763.                                              SWS_PARAM_DEFAULT };

  1764. 

  1765.     if (!param)

  1766.         param = default_param;

  1767. 

  1768.     if (context &&

  1769.         (context->srcW      != srcW      ||

  1770.          context->srcH      != srcH      ||

  1771.          context->srcFormat != srcFormat ||

  1772.          context->dstW      != dstW      ||

  1773.          context->dstH      != dstH      ||

  1774.          context->dstFormat != dstFormat ||

  1775.          context->flags     != flags     ||

  1776.          context->param[0]  != param[0]  ||

  1777.          context->param[1]  != param[1])) {

  1778.         sws_freeContext(context);

  1779.         context = NULL;

  1780.     }

  1781. 

  1782.     if (!context) {

  1783.         if (!(context = sws_alloc_context()))

  1784.             return NULL;

  1785.         context->srcW      = srcW;

  1786.         context->srcH      = srcH;

  1787.         context->srcRange  = handle_jpeg(&srcFormat);

  1788.         context->srcFormat = srcFormat;

  1789.         context->dstW      = dstW;

  1790.         context->dstH      = dstH;

  1791.         context->dstRange  = handle_jpeg(&dstFormat);

  1792.         context->dstFormat = dstFormat;

  1793.         context->flags     = flags;

  1794.         context->param[0]  = param[0];

  1795.         context->param[1]  = param[1];

  1796.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1797.                                  context->srcRange,

  1798.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1799.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1800.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1801.             sws_freeContext(context);

  1802.             return NULL;

  1803.         }

  1804.     }

  1805.     return context;

  1806. }