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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, 0 },

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

  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_GBRAP16LE]   = { 1, 0 },

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

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

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

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

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

  198. };

  199. 

  200. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  201. {

  202.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  203.            format_entries[pix_fmt].is_supported_in : 0;

  204. }

  205. 

  206. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  207. {

  208.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  209.            format_entries[pix_fmt].is_supported_out : 0;

  210. }

  211. 

  212. int sws_isSupportedEndiannessConversion(enum AVPixelFormat pix_fmt)

  213. {

  214.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  215.            format_entries[pix_fmt].is_supported_endianness : 0;

  216. }

  217. 

  218. const char *sws_format_name(enum AVPixelFormat format)

  219. {

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

  221.     if (desc)

  222.         return desc->name;

  223.     else

  224.         return "Unknown format";

  225. }

  226. 

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

  228.                              double dist)

  229. {

  230.     if (dist <= 1.0)

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

  232.     else

  233.         return getSplineCoeff(0.0,

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

  235.                                c + 3.0 * d,

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

  237.                               dist - 1.0);

  238. }

  239. 

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

  241.                               int *outFilterSize, int xInc, int srcW,

  242.                               int dstW, int filterAlign, int one,

  243.                               int flags, int cpu_flags,

  244.                               SwsVector *srcFilter, SwsVector *dstFilter,

  245.                               double param[2], int is_horizontal)

  246. {

  247.     int i;

  248.     int filterSize;

  249.     int filter2Size;

  250.     int minFilterSize;

  251.     int64_t *filter    = NULL;

  252.     int64_t *filter2   = NULL;

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

  254.     int ret            = -1;

  255. 

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

  257. 

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

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

  260. 

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

  262.         int i;

  263.         filterSize = 1;

  264.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  266. 

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

  268.             filter[i * filterSize] = fone;

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

  270.         }

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

  272.         int i;

  273.         int xDstInSrc;

  274.         filterSize = 1;

  275.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  277. 

  278.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  281. 

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

  283.             filter[i]       = fone;

  284.             xDstInSrc      += xInc;

  285.         }

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

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

  288.         int i;

  289.         int xDstInSrc;

  290.         filterSize = 2;

  291.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  293. 

  294.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  297.             int j;

  298. 

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

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

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

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

  303.                                 (fone >> 16);

  304.                 if (coeff < 0)

  305.                     coeff = 0;

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

  307.                 xx++;

  308.             }

  309.             xDstInSrc += xInc;

  310.         }

  311.     } else {

  312.         int64_t xDstInSrc;

  313.         int sizeFactor;

  314. 

  315.         if (flags & SWS_BICUBIC)

  316.             sizeFactor = 4;

  317.         else if (flags & SWS_X)

  318.             sizeFactor = 8;

  319.         else if (flags & SWS_AREA)

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

  321.         else if (flags & SWS_GAUSS)

  322.             sizeFactor = 8;     // infinite ;)

  323.         else if (flags & SWS_LANCZOS)

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

  325.         else if (flags & SWS_SINC)

  326.             sizeFactor = 20;    // infinite ;)

  327.         else if (flags & SWS_SPLINE)

  328.             sizeFactor = 20;    // infinite ;)

  329.         else if (flags & SWS_BILINEAR)

  330.             sizeFactor = 2;

  331.         else {

  332.             sizeFactor = 0;     // GCC warning killer

  333.             assert(0);

  334.         }

  335. 

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

  337.             filterSize = 1 + sizeFactor;    // upscale

  338.         else

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

  340. 

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

  342.         filterSize = FFMAX(filterSize, 1);

  343. 

  344.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  346. 

  347.         xDstInSrc = xInc - 0x10000;

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

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

  350.             int j;

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

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

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

  354.                 double floatd;

  355.                 int64_t coeff;

  356. 

  357.                 if (xInc > 1 << 16)

  358.                     d = d * dstW / srcW;

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

  360. 

  361.                 if (flags & SWS_BICUBIC) {

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

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

  364. 

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

  366.                         coeff = 0.0;

  367.                     } else {

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

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

  370. 

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

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

  373.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  374.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  375.                         else

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

  377.                                       (6 * B + 30 * C) * dd  +

  378.                                     (-12 * B - 48 * C) * d   +

  379.                                       (8 * B + 24 * C) * (1 << 30);

  380.                     }

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

  382.                 }

  383.                 else if (flags & SWS_X) {

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

  385.                     double c;

  386. 

  387.                     if (floatd < 1.0)

  388.                         c = cos(floatd * M_PI);

  389.                     else

  390.                         c = -1.0;

  391.                     if (c < 0.0)

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

  393.                     else

  394.                         c = pow(c, A);

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

  396.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  402.                     else

  403.                         coeff = 0.0;

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

  405.                 } else if (flags & SWS_GAUSS) {

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

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

  408.                 } else if (flags & SWS_SINC) {

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

  410.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  414.                     if (floatd > p)

  415.                         coeff = 0;

  416.                 } else if (flags & SWS_BILINEAR) {

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

  418.                     if (coeff < 0)

  419.                         coeff = 0;

  420.                     coeff *= fone >> 30;

  421.                 } else if (flags & SWS_SPLINE) {

  422.                     double p = -2.196152422706632;

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

  424.                 } else {

  425.                     coeff = 0.0; // GCC warning killer

  426.                     assert(0);

  427.                 }

  428. 

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

  430.                 xx++;

  431.             }

  432.             xDstInSrc += 2 * xInc;

  433.         }

  434.     }

  435. 

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

  437.      * av_free(filter);

  438.      */

  439.     assert(filterSize > 0);

  440.     filter2Size = filterSize;

  441.     if (srcFilter)

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

  443.     if (dstFilter)

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

  445.     assert(filter2Size > 0);

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

  447. 

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

  449.         int j, k;

  450. 

  451.         if (srcFilter) {

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

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

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

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

  456.             }

  457.         } else {

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

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

  460.         }

  461.         // FIXME dstFilter

  462. 

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

  464.     }

  465.     av_freep(&filter);

  466. 

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

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

  469.     minFilterSize = 0;

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

  471.         int min = filter2Size;

  472.         int j;

  473.         int64_t cutOff = 0.0;

  474. 

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

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

  477.             int k;

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

  479. 

  480.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  481.                 break;

  482. 

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

  484.              * filter otherwise */

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

  486.                 break;

  487. 

  488.             // move filter coefficients left

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

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

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

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

  493.         }

  494. 

  495.         cutOff = 0;

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

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

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

  499. 

  500.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  501.                 break;

  502.             min--;

  503.         }

  504. 

  505.         if (min > minFilterSize)

  506.             minFilterSize = min;

  507.     }

  508. 

  509.     if (PPC_ALTIVEC(cpu_flags)) {

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

  511.         if (minFilterSize < 5)

  512.             filterAlign = 4;

  513. 

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

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

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

  517.         if (minFilterSize < 3)

  518.             filterAlign = 1;

  519.     }

  520. 

  521.     if (INLINE_MMX(cpu_flags)) {

  522.         // special case for unscaled vertical filtering

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

  524.             filterAlign = 1;

  525.     }

  526. 

  527.     assert(minFilterSize > 0);

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

  529.     assert(filterSize > 0);

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

  531.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  533.         goto fail;

  534.     *outFilterSize = filterSize;

  535. 

  536.     if (flags & SWS_PRINT_INFO)

  537.         av_log(NULL, AV_LOG_VERBOSE,

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

  539.                filter2Size, filterSize);

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

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

  542.         int j;

  543. 

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

  545.             if (j >= filter2Size)

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

  547.             else

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

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

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

  551.         }

  552.     }

  553. 

  554.     // FIXME try to align filterPos if possible

  555. 

  556.     // fix borders

  557.     if (is_horizontal) {

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

  559.             int j;

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

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

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

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

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

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

  566.                 }

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

  568.             }

  569. 

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

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

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

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

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

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

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

  577.                 }

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

  579.             }

  580.         }

  581.     }

  582. 

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

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

  585.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  587. 

  588.     /* normalize & store in outFilter */

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

  590.         int j;

  591.         int64_t error = 0;

  592.         int64_t sum   = 0;

  593. 

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

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

  596.         }

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

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

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

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

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

  602.             error                                  = v - intV * sum;

  603.         }

  604.     }

  605. 

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

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

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

  609.                                                       * read over the end */

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

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

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

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

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

  615.     }

  616. 

  617.     ret = 0;

  618. 

  619. fail:

  620.     av_free(filter);

  621.     av_free(filter2);

  622.     return ret;

  623. }

  624. 

  625. #if HAVE_MMXEXT_INLINE

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

  627.                                        int16_t *filter, int32_t *filterPos,

  628.                                        int numSplits)

  629. {

  630.     uint8_t *fragmentA;

  631.     x86_reg imm8OfPShufW1A;

  632.     x86_reg imm8OfPShufW2A;

  633.     x86_reg fragmentLengthA;

  634.     uint8_t *fragmentB;

  635.     x86_reg imm8OfPShufW1B;

  636.     x86_reg imm8OfPShufW2B;

  637.     x86_reg fragmentLengthB;

  638.     int fragmentPos;

  639. 

  640.     int xpos, i;

  641. 

  642.     // create an optimized horizontal scaling routine

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

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

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

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

  647.      */

  648. 

  649.     // code fragment

  650. 

  651.     __asm__ volatile (

  652.         "jmp                         9f                 \n\t"

  653.         // Begin

  654.         "0:                                             \n\t"

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

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

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

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

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

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

  661.         "1:                                             \n\t"

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

  663.         "2:                                             \n\t"

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

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

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

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

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

  669. 

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

  671. 

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

  673.         // End

  674.         "9:                                             \n\t"

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

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

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

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

  679.         "dec                         %1                 \n\t"

  680.         "dec                         %2                 \n\t"

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

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

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

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

  685. 

  686. 

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

  688.           "=r" (fragmentLengthA)

  689.         );

  690. 

  691.     __asm__ volatile (

  692.         "jmp                         9f                 \n\t"

  693.         // Begin

  694.         "0:                                             \n\t"

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

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

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

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

  699.         "1:                                             \n\t"

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

  701.         "2:                                             \n\t"

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

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

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

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

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

  707. 

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

  709. 

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

  711.         // End

  712.         "9:                                             \n\t"

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

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

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

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

  717.         "dec                         %1                 \n\t"

  718.         "dec                         %2                 \n\t"

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

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

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

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

  723. 

  724. 

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

  726.           "=r" (fragmentLengthB)

  727.         );

  728. 

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

  730.     fragmentPos = 0;

  731. 

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

  733.         int xx = xpos >> 16;

  734. 

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

  736.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  746.             int shift              = 0;

  747. 

  748.             if (filterCode) {

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

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

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

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

  753.                 filterPos[i / 2] = xx;

  754. 

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

  756. 

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

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

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

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

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

  762.                                                                (c << 4) |

  763.                                                                (d << 6);

  764. 

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

  766.                     shift = maxShift;               // avoid overread

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

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

  769. 

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

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

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

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

  774.                 }

  775.             }

  776. 

  777.             fragmentPos += fragmentLength;

  778. 

  779.             if (filterCode)

  780.                 filterCode[fragmentPos] = RET;

  781.         }

  782.         xpos += xInc;

  783.     }

  784.     if (filterCode)

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

  786. 

  787.     return fragmentPos + 1;

  788. }

  789. #endif /* HAVE_MMXEXT_INLINE */

  790. 

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

  792. {

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

  794.     *h = desc->log2_chroma_w;

  795.     *v = desc->log2_chroma_h;

  796. }

  797. 

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

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

  800.                              int brightness, int contrast, int saturation)

  801. {

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

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

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

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

  806. 

  807.     c->brightness = brightness;

  808.     c->contrast   = contrast;

  809.     c->saturation = saturation;

  810.     c->srcRange   = srcRange;

  811.     c->dstRange   = dstRange;

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

  813.         return -1;

  814. 

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

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

  817. 

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

  819.                              contrast, saturation);

  820.     // FIXME factorize

  821. 

  822.     if (ARCH_PPC)

  823.         ff_yuv2rgb_init_tables_ppc(c, inv_table, brightness,

  824.                                    contrast, saturation);

  825.     return 0;

  826. }

  827. 

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

  829.                              int *srcRange, int **table, int *dstRange,

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

  831. {

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

  833.         return -1;

  834. 

  835.     *inv_table  = c->srcColorspaceTable;

  836.     *table      = c->dstColorspaceTable;

  837.     *srcRange   = c->srcRange;

  838.     *dstRange   = c->dstRange;

  839.     *brightness = c->brightness;

  840.     *contrast   = c->contrast;

  841.     *saturation = c->saturation;

  842. 

  843.     return 0;

  844. }

  845. 

  846. static int handle_jpeg(enum AVPixelFormat *format)

  847. {

  848.     switch (*format) {

  849.     case AV_PIX_FMT_YUVJ420P:

  850.         *format = AV_PIX_FMT_YUV420P;

  851.         return 1;

  852.     case AV_PIX_FMT_YUVJ422P:

  853.         *format = AV_PIX_FMT_YUV422P;

  854.         return 1;

  855.     case AV_PIX_FMT_YUVJ444P:

  856.         *format = AV_PIX_FMT_YUV444P;

  857.         return 1;

  858.     case AV_PIX_FMT_YUVJ440P:

  859.         *format = AV_PIX_FMT_YUV440P;

  860.         return 1;

  861.     default:

  862.         return 0;

  863.     }

  864. }

  865. 

  866. SwsContext *sws_alloc_context(void)

  867. {

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

  869. 

  870.     if (c) {

  871.         c->av_class = &ff_sws_context_class;

  872.         av_opt_set_defaults(c);

  873.     }

  874. 

  875.     return c;

  876. }

  877. 

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

  879.                              SwsFilter *dstFilter)

  880. {

  881.     int i;

  882.     int usesVFilter, usesHFilter;

  883.     int unscaled;

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

  885.     int srcW              = c->srcW;

  886.     int srcH              = c->srcH;

  887.     int dstW              = c->dstW;

  888.     int dstH              = c->dstH;

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

  890.     int dst_stride_px     = dst_stride >> 1;

  891.     int flags, cpu_flags;

  892.     enum AVPixelFormat srcFormat = c->srcFormat;

  893.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  896. 

  897.     cpu_flags = av_get_cpu_flags();

  898.     flags     = c->flags;

  899.     emms_c();

  900.     if (!rgb15to16)

  901.         ff_rgb2rgb_init();

  902. 

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

  904. 

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

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

  907.     if (!sws_isSupportedInput(srcFormat)) {

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

  909.                sws_format_name(srcFormat));

  910.         return AVERROR(EINVAL);

  911.     }

  912.     if (!sws_isSupportedOutput(dstFormat)) {

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

  914.                sws_format_name(dstFormat));

  915.         return AVERROR(EINVAL);

  916.     }

  917.     }

  918. 

  919.     i = flags & (SWS_POINT         |

  920.                  SWS_AREA          |

  921.                  SWS_BILINEAR      |

  922.                  SWS_FAST_BILINEAR |

  923.                  SWS_BICUBIC       |

  924.                  SWS_X             |

  925.                  SWS_GAUSS         |

  926.                  SWS_LANCZOS       |

  927.                  SWS_SINC          |

  928.                  SWS_SPLINE        |

  929.                  SWS_BICUBLIN);

  930. 

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

  932.     if (!i) {

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

  934.             flags |= SWS_GAUSS;

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

  936.             flags |= SWS_SINC;

  937.         else

  938.             flags |= SWS_LANCZOS;

  939.         c->flags = flags;

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

  941.         av_log(c, AV_LOG_ERROR,

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

  943.         return AVERROR(EINVAL);

  944.     }

  945.     /* sanity check */

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

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

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

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

  950.                srcW, srcH, dstW, dstH);

  951.         return AVERROR(EINVAL);

  952.     }

  953. 

  954.     if (!dstFilter)

  955.         dstFilter = &dummyFilter;

  956.     if (!srcFilter)

  957.         srcFilter = &dummyFilter;

  958. 

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

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

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

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

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

  964. 

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

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

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

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

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

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

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

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

  973. 

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

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

  976. 

  977.     if (isPlanarRGB(dstFormat)) {

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

  979.             av_log(c, AV_LOG_DEBUG,

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

  981.                    av_get_pix_fmt_name(dstFormat));

  982.             flags   |= SWS_FULL_CHR_H_INT;

  983.             c->flags = flags;

  984.         }

  985.     }

  986. 

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

  988.      * chroma interpolation */

  989.     if (flags & SWS_FULL_CHR_H_INT &&

  990.         isAnyRGB(dstFormat)        &&

  991.         !isPlanarRGB(dstFormat)    &&

  992.         dstFormat != AV_PIX_FMT_RGBA  &&

  993.         dstFormat != AV_PIX_FMT_ARGB  &&

  994.         dstFormat != AV_PIX_FMT_BGRA  &&

  995.         dstFormat != AV_PIX_FMT_ABGR  &&

  996.         dstFormat != AV_PIX_FMT_RGB24 &&

  997.         dstFormat != AV_PIX_FMT_BGR24) {

  998.         av_log(c, AV_LOG_ERROR,

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

  1000.                sws_format_name(dstFormat));

  1001.         flags   &= ~SWS_FULL_CHR_H_INT;

  1002.         c->flags = flags;

  1003.     }

  1004.     if (isAnyRGB(dstFormat) && !(flags & SWS_FULL_CHR_H_INT))

  1005.         c->chrDstHSubSample = 1;

  1006. 

  1007.     // drop some chroma lines if the user wants it

  1008.     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>

  1009.                            SWS_SRC_V_CHR_DROP_SHIFT;

  1010.     c->chrSrcVSubSample += c->vChrDrop;

  1011. 

  1012.     /* drop every other pixel for chroma calculation unless user

  1013.      * wants full chroma */

  1014.     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

  1015.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  1016.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  1017.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

  1018.         srcFormat != AV_PIX_FMT_GBRP9BE   && srcFormat != AV_PIX_FMT_GBRP9LE  &&

  1019.         srcFormat != AV_PIX_FMT_GBRP10BE  && srcFormat != AV_PIX_FMT_GBRP10LE &&

  1020.         srcFormat != AV_PIX_FMT_GBRP12BE  && srcFormat != AV_PIX_FMT_GBRP12LE &&

  1021.         srcFormat != AV_PIX_FMT_GBRP16BE  && srcFormat != AV_PIX_FMT_GBRP16LE &&

  1022.         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||

  1023.          (flags & SWS_FAST_BILINEAR)))

  1024.         c->chrSrcHSubSample = 1;

  1025. 

  1026.     // Note the AV_CEIL_RSHIFT is so that we always round toward +inf.

  1027.     c->chrSrcW = AV_CEIL_RSHIFT(srcW, c->chrSrcHSubSample);

  1028.     c->chrSrcH = AV_CEIL_RSHIFT(srcH, c->chrSrcVSubSample);

  1029.     c->chrDstW = AV_CEIL_RSHIFT(dstW, c->chrDstHSubSample);

  1030.     c->chrDstH = AV_CEIL_RSHIFT(dstH, c->chrDstVSubSample);

  1031. 

  1032.     /* unscaled special cases */

  1033.     if (unscaled && !usesHFilter && !usesVFilter &&

  1034.         (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  1035.         ff_get_unscaled_swscale(c);

  1036. 

  1037.         if (c->swscale) {

  1038.             if (flags & SWS_PRINT_INFO)

  1039.                 av_log(c, AV_LOG_INFO,

  1040.                        "using unscaled %s -> %s special converter\n",

  1041.                        sws_format_name(srcFormat), sws_format_name(dstFormat));

  1042.             return 0;

  1043.         }

  1044.     }

  1045. 

  1046.     c->srcBpc = desc_src->comp[0].depth;

  1047.     if (c->srcBpc < 8)

  1048.         c->srcBpc = 8;

  1049.     c->dstBpc = desc_dst->comp[0].depth;

  1050.     if (c->dstBpc < 8)

  1051.         c->dstBpc = 8;

  1052.     if (c->dstBpc == 16)

  1053.         dst_stride <<= 1;

  1054.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

  1055.                      (FFALIGN(srcW, 16) * 2 * FFALIGN(c->srcBpc, 8) >> 3) + 16,

  1056.                      fail);

  1057.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 12) {

  1058.         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1059.                               (srcW & 15) == 0) ? 1 : 0;

  1060.         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

  1061.             && (flags & SWS_FAST_BILINEAR)) {

  1062.             if (flags & SWS_PRINT_INFO)

  1063.                 av_log(c, AV_LOG_INFO,

  1064.                        "output width is not a multiple of 32 -> no MMXEXT scaler\n");

  1065.         }

  1066.         if (usesHFilter)

  1067.             c->canMMXEXTBeUsed = 0;

  1068.     } else

  1069.         c->canMMXEXTBeUsed = 0;

  1070. 

  1071.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1072.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1073. 

  1074.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1075.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1076.      * correct scaling.

  1077.      * n-2 is the last chrominance sample available.

  1078.      * This is not perfect, but no one should notice the difference, the more

  1079.      * correct variant would be like the vertical one, but that would require

  1080.      * some special code for the first and last pixel */

  1081.     if (flags & SWS_FAST_BILINEAR) {

  1082.         if (c->canMMXEXTBeUsed) {

  1083.             c->lumXInc += 20;

  1084.             c->chrXInc += 20;

  1085.         }

  1086.         // we don't use the x86 asm scaler if MMX is available

  1087.         else if (INLINE_MMX(cpu_flags)) {

  1088.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1089.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1090.         }

  1091.     }

  1092. 

  1093. #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)

  1094. 

  1095.     /* precalculate horizontal scaler filter coefficients */

  1096.     {

  1097. #if HAVE_MMXEXT_INLINE

  1098. // can't downscale !!!

  1099.         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

  1100.             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,

  1101.                                                              NULL, NULL, 8);

  1102.             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,

  1103.                                                              NULL, NULL, NULL, 4);

  1104. 

  1105. #if USE_MMAP

  1106.             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,

  1107.                                           PROT_READ | PROT_WRITE,

  1108.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1109.                                           -1, 0);

  1110.             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,

  1111.                                           PROT_READ | PROT_WRITE,

  1112.                                           MAP_PRIVATE | MAP_ANONYMOUS,

  1113.                                           -1, 0);

  1114. #elif HAVE_VIRTUALALLOC

  1115.             c->lumMmxextFilterCode = VirtualAlloc(NULL,

  1116.                                                   c->lumMmxextFilterCodeSize,

  1117.                                                   MEM_COMMIT,

  1118.                                                   PAGE_EXECUTE_READWRITE);

  1119.             c->chrMmxextFilterCode = VirtualAlloc(NULL,

  1120.                                                   c->chrMmxextFilterCodeSize,

  1121.                                                   MEM_COMMIT,

  1122.                                                   PAGE_EXECUTE_READWRITE);

  1123. #else

  1124.             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);

  1125.             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

  1126. #endif

  1127. 

  1128.             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

  1129.                 return AVERROR(ENOMEM);

  1130.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1131.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1132.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1133.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1134. 

  1135.             init_hscaler_mmxext(dstW, c->lumXInc, c->lumMmxextFilterCode,

  1136.                                 c->hLumFilter, c->hLumFilterPos, 8);

  1137.             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

  1138.                                 c->hChrFilter, c->hChrFilterPos, 4);

  1139. 

  1140. #if USE_MMAP

  1141.             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1142.             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

  1143. #endif

  1144.         } else

  1145. #endif /* HAVE_MMXEXT_INLINE */

  1146.         {

  1147.             const int filterAlign = X86_MMX(cpu_flags)     ? 4 :

  1148.                                     PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1149. 

  1150.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1151.                            &c->hLumFilterSize, c->lumXInc,

  1152.                            srcW, dstW, filterAlign, 1 << 14,

  1153.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1154.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1155.                            c->param, 1) < 0)

  1156.                 goto fail;

  1157.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1158.                            &c->hChrFilterSize, c->chrXInc,

  1159.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

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

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

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

  1163.                 goto fail;

  1164.         }

  1165.     } // initialize horizontal stuff

  1166. 

  1167.     /* precalculate vertical scaler filter coefficients */

  1168.     {

  1169.         const int filterAlign = X86_MMX(cpu_flags)     ? 2 :

  1170.                                 PPC_ALTIVEC(cpu_flags) ? 8 : 1;

  1171. 

  1172.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1173.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1174.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1175.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1176.                        c->param, 0) < 0)

  1177.             goto fail;

  1178.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1179.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1180.                        filterAlign, (1 << 12),

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

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

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

  1184.             goto fail;

  1185. 

  1186. #if HAVE_ALTIVEC

  1187.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1188.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1189. 

  1190.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1191.             int j;

  1192.             short *p = (short *)&c->vYCoeffsBank[i];

  1193.             for (j = 0; j < 8; j++)

  1194.                 p[j] = c->vLumFilter[i];

  1195.         }

  1196. 

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

  1198.             int j;

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

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

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

  1202.         }

  1203. #endif

  1204.     }

  1205. 

  1206.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1207.     c->vLumBufSize = c->vLumFilterSize;

  1208.     c->vChrBufSize = c->vChrFilterSize;

  1209.     for (i = 0; i < dstH; i++) {

  1210.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1211.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1212.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1213.                                << c->chrSrcVSubSample));

  1214. 

  1215.         nextSlice >>= c->chrSrcVSubSample;

  1216.         nextSlice <<= c->chrSrcVSubSample;

  1217.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1218.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1219.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1220.             (nextSlice >> c->chrSrcVSubSample))

  1221.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1222.                              c->vChrFilterPos[chrI];

  1223.     }

  1224. 

  1225.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1226.      * need to allocate several megabytes to handle all possible cases) */

  1227.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1228.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1229.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1230.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1231.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1232.     /* Note we need at least one pixel more at the end because of the MMX code

  1233.      * (just in case someone wants to replace the 4000/8000). */

  1234.     /* align at 16 bytes for AltiVec */

  1235.     for (i = 0; i < c->vLumBufSize; i++) {

  1236.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1237.                           dst_stride + 16, fail);

  1238.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1239.     }

  1240.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1241.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1242.     c->uv_off_byte = dst_stride + 16;

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

  1244.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1245.                          dst_stride * 2 + 32, fail);

  1246.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1247.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1248.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1249.     }

  1250.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

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

  1252.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1253.                               dst_stride + 16, fail);

  1254.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1255.         }

  1256. 

  1257.     // try to avoid drawing green stuff between the right end and the stride end

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

  1259.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1260. 

  1261.     assert(c->chrDstH <= dstH);

  1262. 

  1263.     if (flags & SWS_PRINT_INFO) {

  1264.         if (flags & SWS_FAST_BILINEAR)

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

  1266.         else if (flags & SWS_BILINEAR)

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

  1268.         else if (flags & SWS_BICUBIC)

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

  1270.         else if (flags & SWS_X)

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

  1272.         else if (flags & SWS_POINT)

  1273.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1274.         else if (flags & SWS_AREA)

  1275.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1276.         else if (flags & SWS_BICUBLIN)

  1277.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1278.         else if (flags & SWS_GAUSS)

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

  1280.         else if (flags & SWS_SINC)

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

  1282.         else if (flags & SWS_LANCZOS)

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

  1284.         else if (flags & SWS_SPLINE)

  1285.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1286.         else

  1287.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1288. 

  1289.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1290.                sws_format_name(srcFormat),

  1291. #ifdef DITHER1XBPP

  1292.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1293.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1294.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1295.                                                              "dithered " : "",

  1296. #else

  1297.                "",

  1298. #endif

  1299.                sws_format_name(dstFormat));

  1300. 

  1301.         if (INLINE_MMXEXT(cpu_flags))

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

  1303.         else if (INLINE_AMD3DNOW(cpu_flags))

  1304.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1305.         else if (INLINE_MMX(cpu_flags))

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

  1307.         else if (PPC_ALTIVEC(cpu_flags))

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

  1309.         else

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

  1311. 

  1312.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1313.         av_log(c, AV_LOG_DEBUG,

  1314.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1315.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1316.         av_log(c, AV_LOG_DEBUG,

  1317.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1318.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1319.                c->chrXInc, c->chrYInc);

  1320.     }

  1321. 

  1322.     c->swscale = ff_getSwsFunc(c);

  1323.     return 0;

  1324. fail: // FIXME replace things by appropriate error codes

  1325.     return -1;

  1326. }

  1327. 

  1328. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1329.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1330.                            int flags, SwsFilter *srcFilter,

  1331.                            SwsFilter *dstFilter, const double *param)

  1332. {

  1333.     SwsContext *c;

  1334. 

  1335.     if (!(c = sws_alloc_context()))

  1336.         return NULL;

  1337. 

  1338.     c->flags     = flags;

  1339.     c->srcW      = srcW;

  1340.     c->srcH      = srcH;

  1341.     c->dstW      = dstW;

  1342.     c->dstH      = dstH;

  1343.     c->srcRange  = handle_jpeg(&srcFormat);

  1344.     c->dstRange  = handle_jpeg(&dstFormat);

  1345.     c->srcFormat = srcFormat;

  1346.     c->dstFormat = dstFormat;

  1347. 

  1348.     if (param) {

  1349.         c->param[0] = param[0];

  1350.         c->param[1] = param[1];

  1351.     }

  1352.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1353.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1354.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1355. 

  1356.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1357.         sws_freeContext(c);

  1358.         return NULL;

  1359.     }

  1360. 

  1361.     return c;

  1362. }

  1363. 

  1364. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1365.                                 float lumaSharpen, float chromaSharpen,

  1366.                                 float chromaHShift, float chromaVShift,

  1367.                                 int verbose)

  1368. {

  1369.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1370.     if (!filter)

  1371.         return NULL;

  1372. 

  1373.     if (lumaGBlur != 0.0) {

  1374.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1375.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1376.     } else {

  1377.         filter->lumH = sws_getIdentityVec();

  1378.         filter->lumV = sws_getIdentityVec();

  1379.     }

  1380. 

  1381.     if (chromaGBlur != 0.0) {

  1382.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1383.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1384.     } else {

  1385.         filter->chrH = sws_getIdentityVec();

  1386.         filter->chrV = sws_getIdentityVec();

  1387.     }

  1388. 

  1389.     if (!filter->lumH || !filter->lumV || !filter->chrH || !filter->chrV)

  1390.         goto fail;

  1391. 

  1392.     if (chromaSharpen != 0.0) {

  1393.         SwsVector *id = sws_getIdentityVec();

  1394.         if (!id)

  1395.             goto fail;

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

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

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

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

  1400.         sws_freeVec(id);

  1401.     }

  1402. 

  1403.     if (lumaSharpen != 0.0) {

  1404.         SwsVector *id = sws_getIdentityVec();

  1405.         if (!id)

  1406.             goto fail;

  1407.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1408.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1409.         sws_addVec(filter->lumH, id);

  1410.         sws_addVec(filter->lumV, id);

  1411.         sws_freeVec(id);

  1412.     }

  1413. 

  1414.     if (chromaHShift != 0.0)

  1415.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1416. 

  1417.     if (chromaVShift != 0.0)

  1418.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1419. 

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

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

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

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

  1424. 

  1425.     if (verbose)

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

  1427.     if (verbose)

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

  1429. 

  1430.     return filter;

  1431. 

  1432. fail:

  1433.     sws_freeVec(filter->lumH);

  1434.     sws_freeVec(filter->lumV);

  1435.     sws_freeVec(filter->chrH);

  1436.     sws_freeVec(filter->chrV);

  1437.     av_freep(&filter);

  1438.     return NULL;

  1439. }

  1440. 

  1441. SwsVector *sws_allocVec(int length)

  1442. {

  1443.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1444.     if (!vec)

  1445.         return NULL;

  1446.     vec->length = length;

  1447.     vec->coeff  = av_malloc(sizeof(double) * length);

  1448.     if (!vec->coeff)

  1449.         av_freep(&vec);

  1450.     return vec;

  1451. }

  1452. 

  1453. SwsVector *sws_getGaussianVec(double variance, double quality)

  1454. {

  1455.     const int length = (int)(variance * quality + 0.5) | 1;

  1456.     int i;

  1457.     double middle  = (length - 1) * 0.5;

  1458.     SwsVector *vec = sws_allocVec(length);

  1459. 

  1460.     if (!vec)

  1461.         return NULL;

  1462. 

  1463.     for (i = 0; i < length; i++) {

  1464.         double dist = i - middle;

  1465.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1466.                         sqrt(2 * variance * M_PI);

  1467.     }

  1468. 

  1469.     sws_normalizeVec(vec, 1.0);

  1470. 

  1471.     return vec;

  1472. }

  1473. 

  1474. SwsVector *sws_getConstVec(double c, int length)

  1475. {

  1476.     int i;

  1477.     SwsVector *vec = sws_allocVec(length);

  1478. 

  1479.     if (!vec)

  1480.         return NULL;

  1481. 

  1482.     for (i = 0; i < length; i++)

  1483.         vec->coeff[i] = c;

  1484. 

  1485.     return vec;

  1486. }

  1487. 

  1488. SwsVector *sws_getIdentityVec(void)

  1489. {

  1490.     return sws_getConstVec(1.0, 1);

  1491. }

  1492. 

  1493. static double sws_dcVec(SwsVector *a)

  1494. {

  1495.     int i;

  1496.     double sum = 0;

  1497. 

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

  1499.         sum += a->coeff[i];

  1500. 

  1501.     return sum;

  1502. }

  1503. 

  1504. void sws_scaleVec(SwsVector *a, double scalar)

  1505. {

  1506.     int i;

  1507. 

  1508.     for (i = 0; i < a->length; i++)

  1509.         a->coeff[i] *= scalar;

  1510. }

  1511. 

  1512. void sws_normalizeVec(SwsVector *a, double height)

  1513. {

  1514.     sws_scaleVec(a, height / sws_dcVec(a));

  1515. }

  1516. 

  1517. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1518. {

  1519.     int length = a->length + b->length - 1;

  1520.     int i, j;

  1521.     SwsVector *vec = sws_getConstVec(0.0, length);

  1522. 

  1523.     if (!vec)

  1524.         return NULL;

  1525. 

  1526.     for (i = 0; i < a->length; i++) {

  1527.         for (j = 0; j < b->length; j++) {

  1528.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1529.         }

  1530.     }

  1531. 

  1532.     return vec;

  1533. }

  1534. 

  1535. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1536. {

  1537.     int length = FFMAX(a->length, b->length);

  1538.     int i;

  1539.     SwsVector *vec = sws_getConstVec(0.0, length);

  1540. 

  1541.     if (!vec)

  1542.         return NULL;

  1543. 

  1544.     for (i = 0; i < a->length; i++)

  1545.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

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

  1548. 

  1549.     return vec;

  1550. }

  1551. 

  1552. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1553. {

  1554.     int length = FFMAX(a->length, b->length);

  1555.     int i;

  1556.     SwsVector *vec = sws_getConstVec(0.0, length);

  1557. 

  1558.     if (!vec)

  1559.         return NULL;

  1560. 

  1561.     for (i = 0; i < a->length; i++)

  1562.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

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

  1565. 

  1566.     return vec;

  1567. }

  1568. 

  1569. /* shift left / or right if "shift" is negative */

  1570. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1571. {

  1572.     int length = a->length + FFABS(shift) * 2;

  1573.     int i;

  1574.     SwsVector *vec = sws_getConstVec(0.0, length);

  1575. 

  1576.     if (!vec)

  1577.         return NULL;

  1578. 

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

  1580.         vec->coeff[i + (length    - 1) / 2 -

  1581.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1582.     }

  1583. 

  1584.     return vec;

  1585. }

  1586. 

  1587. void sws_shiftVec(SwsVector *a, int shift)

  1588. {

  1589.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1590.     av_free(a->coeff);

  1591.     a->coeff  = shifted->coeff;

  1592.     a->length = shifted->length;

  1593.     av_free(shifted);

  1594. }

  1595. 

  1596. void sws_addVec(SwsVector *a, SwsVector *b)

  1597. {

  1598.     SwsVector *sum = sws_sumVec(a, b);

  1599.     av_free(a->coeff);

  1600.     a->coeff  = sum->coeff;

  1601.     a->length = sum->length;

  1602.     av_free(sum);

  1603. }

  1604. 

  1605. void sws_subVec(SwsVector *a, SwsVector *b)

  1606. {

  1607.     SwsVector *diff = sws_diffVec(a, b);

  1608.     av_free(a->coeff);

  1609.     a->coeff  = diff->coeff;

  1610.     a->length = diff->length;

  1611.     av_free(diff);

  1612. }

  1613. 

  1614. void sws_convVec(SwsVector *a, SwsVector *b)

  1615. {

  1616.     SwsVector *conv = sws_getConvVec(a, b);

  1617.     av_free(a->coeff);

  1618.     a->coeff  = conv->coeff;

  1619.     a->length = conv->length;

  1620.     av_free(conv);

  1621. }

  1622. 

  1623. SwsVector *sws_cloneVec(SwsVector *a)

  1624. {

  1625.     int i;

  1626.     SwsVector *vec = sws_allocVec(a->length);

  1627. 

  1628.     if (!vec)

  1629.         return NULL;

  1630. 

  1631.     for (i = 0; i < a->length; i++)

  1632.         vec->coeff[i] = a->coeff[i];

  1633. 

  1634.     return vec;

  1635. }

  1636. 

  1637. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1638. {

  1639.     int i;

  1640.     double max = 0;

  1641.     double min = 0;

  1642.     double range;

  1643. 

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

  1645.         if (a->coeff[i] > max)

  1646.             max = a->coeff[i];

  1647. 

  1648.     for (i = 0; i < a->length; i++)

  1649.         if (a->coeff[i] < min)

  1650.             min = a->coeff[i];

  1651. 

  1652.     range = max - min;

  1653. 

  1654.     for (i = 0; i < a->length; i++) {

  1655.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1656.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1657.         for (; x > 0; x--)

  1658.             av_log(log_ctx, log_level, " ");

  1659.         av_log(log_ctx, log_level, "|\n");

  1660.     }

  1661. }

  1662. 

  1663. void sws_freeVec(SwsVector *a)

  1664. {

  1665.     if (!a)

  1666.         return;

  1667.     av_freep(&a->coeff);

  1668.     a->length = 0;

  1669.     av_free(a);

  1670. }

  1671. 

  1672. void sws_freeFilter(SwsFilter *filter)

  1673. {

  1674.     if (!filter)

  1675.         return;

  1676. 

  1677.     if (filter->lumH)

  1678.         sws_freeVec(filter->lumH);

  1679.     if (filter->lumV)

  1680.         sws_freeVec(filter->lumV);

  1681.     if (filter->chrH)

  1682.         sws_freeVec(filter->chrH);

  1683.     if (filter->chrV)

  1684.         sws_freeVec(filter->chrV);

  1685.     av_free(filter);

  1686. }

  1687. 

  1688. void sws_freeContext(SwsContext *c)

  1689. {

  1690.     int i;

  1691.     if (!c)

  1692.         return;

  1693. 

  1694.     if (c->lumPixBuf) {

  1695.         for (i = 0; i < c->vLumBufSize; i++)

  1696.             av_freep(&c->lumPixBuf[i]);

  1697.         av_freep(&c->lumPixBuf);

  1698.     }

  1699. 

  1700.     if (c->chrUPixBuf) {

  1701.         for (i = 0; i < c->vChrBufSize; i++)

  1702.             av_freep(&c->chrUPixBuf[i]);

  1703.         av_freep(&c->chrUPixBuf);

  1704.         av_freep(&c->chrVPixBuf);

  1705.     }

  1706. 

  1707.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

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

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

  1710.         av_freep(&c->alpPixBuf);

  1711.     }

  1712. 

  1713.     av_freep(&c->vLumFilter);

  1714.     av_freep(&c->vChrFilter);

  1715.     av_freep(&c->hLumFilter);

  1716.     av_freep(&c->hChrFilter);

  1717. #if HAVE_ALTIVEC

  1718.     av_freep(&c->vYCoeffsBank);

  1719.     av_freep(&c->vCCoeffsBank);

  1720. #endif

  1721. 

  1722.     av_freep(&c->vLumFilterPos);

  1723.     av_freep(&c->vChrFilterPos);

  1724.     av_freep(&c->hLumFilterPos);

  1725.     av_freep(&c->hChrFilterPos);

  1726. 

  1727. #if HAVE_MMX_INLINE

  1728. #if USE_MMAP

  1729.     if (c->lumMmxextFilterCode)

  1730.         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);

  1731.     if (c->chrMmxextFilterCode)

  1732.         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

  1733. #elif HAVE_VIRTUALALLOC

  1734.     if (c->lumMmxextFilterCode)

  1735.         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);

  1736.     if (c->chrMmxextFilterCode)

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

  1738. #else

  1739.     av_free(c->lumMmxextFilterCode);

  1740.     av_free(c->chrMmxextFilterCode);

  1741. #endif

  1742.     c->lumMmxextFilterCode = NULL;

  1743.     c->chrMmxextFilterCode = NULL;

  1744. #endif /* HAVE_MMX_INLINE */

  1745. 

  1746.     av_freep(&c->yuvTable);

  1747.     av_free(c->formatConvBuffer);

  1748. 

  1749.     av_free(c);

  1750. }

  1751. 

  1752. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1753.                                         int srcH, enum AVPixelFormat srcFormat,

  1754.                                         int dstW, int dstH,

  1755.                                         enum AVPixelFormat dstFormat, int flags,

  1756.                                         SwsFilter *srcFilter,

  1757.                                         SwsFilter *dstFilter,

  1758.                                         const double *param)

  1759. {

  1760.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1761.                                              SWS_PARAM_DEFAULT };

  1762. 

  1763.     if (!param)

  1764.         param = default_param;

  1765. 

  1766.     if (context &&

  1767.         (context->srcW      != srcW      ||

  1768.          context->srcH      != srcH      ||

  1769.          context->srcFormat != srcFormat ||

  1770.          context->dstW      != dstW      ||

  1771.          context->dstH      != dstH      ||

  1772.          context->dstFormat != dstFormat ||

  1773.          context->flags     != flags     ||

  1774.          context->param[0]  != param[0]  ||

  1775.          context->param[1]  != param[1])) {

  1776.         sws_freeContext(context);

  1777.         context = NULL;

  1778.     }

  1779. 

  1780.     if (!context) {

  1781.         if (!(context = sws_alloc_context()))

  1782.             return NULL;

  1783.         context->srcW      = srcW;

  1784.         context->srcH      = srcH;

  1785.         context->srcRange  = handle_jpeg(&srcFormat);

  1786.         context->srcFormat = srcFormat;

  1787.         context->dstW      = dstW;

  1788.         context->dstH      = dstH;

  1789.         context->dstRange  = handle_jpeg(&dstFormat);

  1790.         context->dstFormat = dstFormat;

  1791.         context->flags     = flags;

  1792.         context->param[0]  = param[0];

  1793.         context->param[1]  = param[1];

  1794.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1795.                                  context->srcRange,

  1796.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1797.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1798.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1799.             sws_freeContext(context);

  1800.             return NULL;

  1801.         }

  1802.     }

  1803.     return context;

  1804. }