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FFmpeg/libswscale/utils.c

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  1. /*

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

  3.  *

  4.  * This file is part of FFmpeg.

  5.  *

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

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

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

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

  10.  *

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

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

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

  14.  * Lesser General Public License for more details.

  15.  *

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

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

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

  19.  */

  20. 

  21. #include "config.h"

  22. 

  23. #define _SVID_SOURCE // needed for MAP_ANONYMOUS

  24. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  25. #include <assert.h>

  26. #include <inttypes.h>

  27. #include <math.h>

  28. #include <stdio.h>

  29. #include <string.h>

  30. #if HAVE_SYS_MMAN_H

  31. #include <sys/mman.h>

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

  33. #define MAP_ANONYMOUS MAP_ANON

  34. #endif

  35. #endif

  36. #if HAVE_VIRTUALALLOC

  37. #define WIN32_LEAN_AND_MEAN

  38. #include <windows.h>

  39. #endif

  40. 

  41. #include "libavutil/avassert.h"

  42. #include "libavutil/avutil.h"

  43. #include "libavutil/bswap.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/intreadwrite.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

  49. #include "libavutil/x86_cpu.h"

  50. #include "rgb2rgb.h"

  51. #include "swscale.h"

  52. #include "swscale_internal.h"

  53. 

  54. unsigned swscale_version(void)

  55. {

  56.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  57.     return LIBSWSCALE_VERSION_INT;

  58. }

  59. 

  60. const char *swscale_configuration(void)

  61. {

  62.     return FFMPEG_CONFIGURATION;

  63. }

  64. 

  65. const char *swscale_license(void)

  66. {

  67. #define LICENSE_PREFIX "libswscale license: "

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

  69. }

  70. 

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

  72. 

  73. typedef struct FormatEntry {

  74.     int is_supported_in, is_supported_out;

  75. } FormatEntry;

  76. 

  77. static const FormatEntry format_entries[PIX_FMT_NB] = {

  78.     [PIX_FMT_YUV420P]     = { 1, 1 },

  79.     [PIX_FMT_YUYV422]     = { 1, 1 },

  80.     [PIX_FMT_RGB24]       = { 1, 1 },

  81.     [PIX_FMT_BGR24]       = { 1, 1 },

  82.     [PIX_FMT_YUV422P]     = { 1, 1 },

  83.     [PIX_FMT_YUV444P]     = { 1, 1 },

  84.     [PIX_FMT_YUV410P]     = { 1, 1 },

  85.     [PIX_FMT_YUV411P]     = { 1, 1 },

  86.     [PIX_FMT_GRAY8]       = { 1, 1 },

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

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

  89.     [PIX_FMT_PAL8]        = { 1, 0 },

  90.     [PIX_FMT_YUVJ420P]    = { 1, 1 },

  91.     [PIX_FMT_YUVJ422P]    = { 1, 1 },

  92.     [PIX_FMT_YUVJ444P]    = { 1, 1 },

  93.     [PIX_FMT_UYVY422]     = { 1, 1 },

  94.     [PIX_FMT_UYYVYY411]   = { 0, 0 },

  95.     [PIX_FMT_BGR8]        = { 1, 1 },

  96.     [PIX_FMT_BGR4]        = { 0, 1 },

  97.     [PIX_FMT_BGR4_BYTE]   = { 1, 1 },

  98.     [PIX_FMT_RGB8]        = { 1, 1 },

  99.     [PIX_FMT_RGB4]        = { 0, 1 },

  100.     [PIX_FMT_RGB4_BYTE]   = { 1, 1 },

  101.     [PIX_FMT_NV12]        = { 1, 1 },

  102.     [PIX_FMT_NV21]        = { 1, 1 },

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

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

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

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

  107.     [PIX_FMT_0RGB]        = { 1, 1 },

  108.     [PIX_FMT_RGB0]        = { 1, 1 },

  109.     [PIX_FMT_0BGR]        = { 1, 1 },

  110.     [PIX_FMT_BGR0]        = { 1, 1 },

  111.     [PIX_FMT_GRAY16BE]    = { 1, 1 },

  112.     [PIX_FMT_GRAY16LE]    = { 1, 1 },

  113.     [PIX_FMT_YUV440P]     = { 1, 1 },

  114.     [PIX_FMT_YUVJ440P]    = { 1, 1 },

  115.     [PIX_FMT_YUVA420P]    = { 1, 1 },

  116.     [PIX_FMT_YUVA444P]    = { 1, 1 },

  117.     [PIX_FMT_RGB48BE]     = { 1, 1 },

  118.     [PIX_FMT_RGB48LE]     = { 1, 1 },

  119.     [PIX_FMT_RGBA64BE]    = { 1, 0 },

  120.     [PIX_FMT_RGBA64LE]    = { 1, 0 },

  121.     [PIX_FMT_RGB565BE]    = { 1, 1 },

  122.     [PIX_FMT_RGB565LE]    = { 1, 1 },

  123.     [PIX_FMT_RGB555BE]    = { 1, 1 },

  124.     [PIX_FMT_RGB555LE]    = { 1, 1 },

  125.     [PIX_FMT_BGR565BE]    = { 1, 1 },

  126.     [PIX_FMT_BGR565LE]    = { 1, 1 },

  127.     [PIX_FMT_BGR555BE]    = { 1, 1 },

  128.     [PIX_FMT_BGR555LE]    = { 1, 1 },

  129.     [PIX_FMT_YUV420P16LE] = { 1, 1 },

  130.     [PIX_FMT_YUV420P16BE] = { 1, 1 },

  131.     [PIX_FMT_YUV422P16LE] = { 1, 1 },

  132.     [PIX_FMT_YUV422P16BE] = { 1, 1 },

  133.     [PIX_FMT_YUV444P16LE] = { 1, 1 },

  134.     [PIX_FMT_YUV444P16BE] = { 1, 1 },

  135.     [PIX_FMT_RGB444LE]    = { 1, 1 },

  136.     [PIX_FMT_RGB444BE]    = { 1, 1 },

  137.     [PIX_FMT_BGR444LE]    = { 1, 1 },

  138.     [PIX_FMT_BGR444BE]    = { 1, 1 },

  139.     [PIX_FMT_Y400A]       = { 1, 0 },

  140.     [PIX_FMT_BGR48BE]     = { 1, 1 },

  141.     [PIX_FMT_BGR48LE]     = { 1, 1 },

  142.     [PIX_FMT_BGRA64BE]    = { 0, 0 },

  143.     [PIX_FMT_BGRA64LE]    = { 0, 0 },

  144.     [PIX_FMT_YUV420P9BE]  = { 1, 1 },

  145.     [PIX_FMT_YUV420P9LE]  = { 1, 1 },

  146.     [PIX_FMT_YUV420P10BE] = { 1, 1 },

  147.     [PIX_FMT_YUV420P10LE] = { 1, 1 },

  148.     [PIX_FMT_YUV422P9BE]  = { 1, 1 },

  149.     [PIX_FMT_YUV422P9LE]  = { 1, 1 },

  150.     [PIX_FMT_YUV422P10BE] = { 1, 1 },

  151.     [PIX_FMT_YUV422P10LE] = { 1, 1 },

  152.     [PIX_FMT_YUV444P9BE]  = { 1, 1 },

  153.     [PIX_FMT_YUV444P9LE]  = { 1, 1 },

  154.     [PIX_FMT_YUV444P10BE] = { 1, 1 },

  155.     [PIX_FMT_YUV444P10LE] = { 1, 1 },

  156.     [PIX_FMT_GBRP]        = { 1, 0 },

  157.     [PIX_FMT_GBRP9LE]     = { 1, 0 },

  158.     [PIX_FMT_GBRP9BE]     = { 1, 0 },

  159.     [PIX_FMT_GBRP10LE]    = { 1, 0 },

  160.     [PIX_FMT_GBRP10BE]    = { 1, 0 },

  161.     [PIX_FMT_GBRP16LE]    = { 1, 0 },

  162.     [PIX_FMT_GBRP16BE]    = { 1, 0 },

  163. };

  164. 

  165. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  166. {

  167.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  168.            format_entries[pix_fmt].is_supported_in : 0;

  169. }

  170. 

  171. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  172. {

  173.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  174.            format_entries[pix_fmt].is_supported_out : 0;

  175. }

  176. 

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

  178. 

  179. #if FF_API_SWS_FORMAT_NAME

  180. const char *sws_format_name(enum PixelFormat format)

  181. {

  182.     return av_get_pix_fmt_name(format);

  183. }

  184. #endif

  185. 

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

  187.                              double dist)

  188. {

  189.     if (dist <= 1.0)

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

  191.     else

  192.         return getSplineCoeff(0.0,

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

  194.                                c + 3.0 * d,

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

  196.                               dist - 1.0);

  197. }

  198. 

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

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

  201.                       int filterAlign, int one, int flags, int cpu_flags,

  202.                       SwsVector *srcFilter, SwsVector *dstFilter,

  203.                       double param[2])

  204. {

  205.     int i;

  206.     int filterSize;

  207.     int filter2Size;

  208.     int minFilterSize;

  209.     int64_t *filter    = NULL;

  210.     int64_t *filter2   = NULL;

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

  212.     int ret            = -1;

  213. 

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

  215. 

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

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

  218. 

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

  220.         int i;

  221.         filterSize = 1;

  222.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  224. 

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

  226.             filter[i * filterSize] = fone;

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

  228.         }

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

  230.         int i;

  231.         int64_t xDstInSrc;

  232.         filterSize = 1;

  233.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  235. 

  236.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  239. 

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

  241.             filter[i]       = fone;

  242.             xDstInSrc      += xInc;

  243.         }

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

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

  246.         int i;

  247.         int64_t xDstInSrc;

  248.         filterSize = 2;

  249.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  251. 

  252.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  255.             int j;

  256. 

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

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

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

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

  261.                 if (coeff < 0)

  262.                     coeff = 0;

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

  264.                 xx++;

  265.             }

  266.             xDstInSrc += xInc;

  267.         }

  268.     } else {

  269.         int64_t xDstInSrc;

  270.         int sizeFactor;

  271. 

  272.         if (flags & SWS_BICUBIC)

  273.             sizeFactor = 4;

  274.         else if (flags & SWS_X)

  275.             sizeFactor = 8;

  276.         else if (flags & SWS_AREA)

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

  278.         else if (flags & SWS_GAUSS)

  279.             sizeFactor = 8;     // infinite ;)

  280.         else if (flags & SWS_LANCZOS)

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

  282.         else if (flags & SWS_SINC)

  283.             sizeFactor = 20;    // infinite ;)

  284.         else if (flags & SWS_SPLINE)

  285.             sizeFactor = 20;    // infinite ;)

  286.         else if (flags & SWS_BILINEAR)

  287.             sizeFactor = 2;

  288.         else {

  289.             sizeFactor = 0;     // GCC warning killer

  290.             assert(0);

  291.         }

  292. 

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

  294.             filterSize = 1 + sizeFactor;    // upscale

  295.         else

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

  297. 

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

  299.         filterSize = FFMAX(filterSize, 1);

  300. 

  301.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  303. 

  304.         xDstInSrc = xInc - 0x10000;

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

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

  307.             int j;

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

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

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

  311.                 double floatd;

  312.                 int64_t coeff;

  313. 

  314.                 if (xInc > 1 << 16)

  315.                     d = d * dstW / srcW;

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

  317. 

  318.                 if (flags & SWS_BICUBIC) {

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

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

  321. 

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

  323.                         coeff = 0.0;

  324.                     } else {

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

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

  327. 

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

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

  330.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  331.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  332.                         else

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

  334.                                       (6 * B + 30 * C) * dd  +

  335.                                     (-12 * B - 48 * C) * d   +

  336.                                       (8 * B + 24 * C) * (1 << 30);

  337.                     }

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

  339.                 }

  340. #if 0

  341.                 else if (flags & SWS_X) {

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

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

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

  345.                 }

  346. #endif

  347.                 else if (flags & SWS_X) {

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

  349.                     double c;

  350. 

  351.                     if (floatd < 1.0)

  352.                         c = cos(floatd * M_PI);

  353.                     else

  354.                         c = -1.0;

  355.                     if (c < 0.0)

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

  357.                     else

  358.                         c = pow(c, A);

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

  360.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  366.                     else

  367.                         coeff = 0.0;

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

  369.                 } else if (flags & SWS_GAUSS) {

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

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

  372.                 } else if (flags & SWS_SINC) {

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

  374.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  378.                     if (floatd > p)

  379.                         coeff = 0;

  380.                 } else if (flags & SWS_BILINEAR) {

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

  382.                     if (coeff < 0)

  383.                         coeff = 0;

  384.                     coeff *= fone >> 30;

  385.                 } else if (flags & SWS_SPLINE) {

  386.                     double p = -2.196152422706632;

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

  388.                 } else {

  389.                     coeff = 0.0; // GCC warning killer

  390.                     assert(0);

  391.                 }

  392. 

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

  394.                 xx++;

  395.             }

  396.             xDstInSrc += 2 * xInc;

  397.         }

  398.     }

  399. 

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

  401.      * av_free(filter);

  402.      */

  403.     assert(filterSize > 0);

  404.     filter2Size = filterSize;

  405.     if (srcFilter)

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

  407.     if (dstFilter)

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

  409.     assert(filter2Size > 0);

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

  411. 

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

  413.         int j, k;

  414. 

  415.         if (srcFilter) {

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

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

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

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

  420.             }

  421.         } else {

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

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

  424.         }

  425.         // FIXME dstFilter

  426. 

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

  428.     }

  429.     av_freep(&filter);

  430. 

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

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

  433.     minFilterSize = 0;

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

  435.         int min = filter2Size;

  436.         int j;

  437.         int64_t cutOff = 0.0;

  438. 

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

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

  441.             int k;

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

  443. 

  444.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  445.                 break;

  446. 

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

  448.              * filter otherwise */

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

  450.                 break;

  451. 

  452.             // move filter coefficients left

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

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

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

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

  457.         }

  458. 

  459.         cutOff = 0;

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

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

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

  463. 

  464.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  465.                 break;

  466.             min--;

  467.         }

  468. 

  469.         if (min > minFilterSize)

  470.             minFilterSize = min;

  471.     }

  472. 

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

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

  475.         if (minFilterSize < 5)

  476.             filterAlign = 4;

  477. 

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

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

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

  481.         if (minFilterSize < 3)

  482.             filterAlign = 1;

  483.     }

  484. 

  485.     if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

  486.         // special case for unscaled vertical filtering

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

  488.             filterAlign = 1;

  489.     }

  490. 

  491.     assert(minFilterSize > 0);

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

  493.     assert(filterSize > 0);

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

  495.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  497.         goto fail;

  498.     *outFilterSize = filterSize;

  499. 

  500.     if (flags & SWS_PRINT_INFO)

  501.         av_log(NULL, AV_LOG_VERBOSE,

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

  503.                filter2Size, filterSize);

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

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

  506.         int j;

  507. 

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

  509.             if (j >= filter2Size)

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

  511.             else

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

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

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

  515.         }

  516.     }

  517. 

  518.     // FIXME try to align filterPos if possible

  519. 

  520.     // fix borders

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

  522.         int j;

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

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

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

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

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

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

  529.             }

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

  531.         }

  532. 

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

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

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

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

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

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

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

  540.             }

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

  542.         }

  543.     }

  544. 

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

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

  547.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  549. 

  550.     /* normalize & store in outFilter */

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

  552.         int j;

  553.         int64_t error = 0;

  554.         int64_t sum   = 0;

  555. 

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

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

  558.         }

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

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

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

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

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

  564.             error                                  = v - intV * sum;

  565.         }

  566.     }

  567. 

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

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

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

  571.                                                       * read over the end */

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

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

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

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

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

  577.     }

  578. 

  579.     ret = 0;

  580. 

  581. fail:

  582.     av_free(filter);

  583.     av_free(filter2);

  584.     return ret;

  585. }

  586. 

  587. #if HAVE_MMX2

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

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

  590. {

  591.     uint8_t *fragmentA;

  592.     x86_reg imm8OfPShufW1A;

  593.     x86_reg imm8OfPShufW2A;

  594.     x86_reg fragmentLengthA;

  595.     uint8_t *fragmentB;

  596.     x86_reg imm8OfPShufW1B;

  597.     x86_reg imm8OfPShufW2B;

  598.     x86_reg fragmentLengthB;

  599.     int fragmentPos;

  600. 

  601.     int xpos, i;

  602. 

  603.     // create an optimized horizontal scaling routine

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

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

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

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

  608.      */

  609. 

  610.     // code fragment

  611. 

  612.     __asm__ volatile (

  613.         "jmp                         9f                 \n\t"

  614.         // Begin

  615.         "0:                                             \n\t"

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

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

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

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

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

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

  622.         "1:                                             \n\t"

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

  624.         "2:                                             \n\t"

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

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

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

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

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

  630. 

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

  632. 

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

  634.         // End

  635.         "9:                                             \n\t"

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

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

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

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

  640.         "dec                         %1                 \n\t"

  641.         "dec                         %2                 \n\t"

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

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

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

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

  646. 

  647. 

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

  649.           "=r" (fragmentLengthA)

  650.         );

  651. 

  652.     __asm__ volatile (

  653.         "jmp                         9f                 \n\t"

  654.         // Begin

  655.         "0:                                             \n\t"

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

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

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

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

  660.         "1:                                             \n\t"

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

  662.         "2:                                             \n\t"

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

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

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

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

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

  668. 

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

  670. 

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

  672.         // End

  673.         "9:                                             \n\t"

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

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

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

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

  678.         "dec                         %1                 \n\t"

  679.         "dec                         %2                 \n\t"

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

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

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

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

  684. 

  685. 

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

  687.           "=r" (fragmentLengthB)

  688.         );

  689. 

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

  691.     fragmentPos = 0;

  692. 

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

  694.         int xx = xpos >> 16;

  695. 

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

  697.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  707.             int shift              = 0;

  708. 

  709.             if (filterCode) {

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

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

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

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

  714.                 filterPos[i / 2] = xx;

  715. 

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

  717. 

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

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

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

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

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

  723.                                                                (c << 4) |

  724.                                                                (d << 6);

  725. 

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

  727.                     shift = maxShift;               // avoid overread

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

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

  730. 

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

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

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

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

  735.                 }

  736.             }

  737. 

  738.             fragmentPos += fragmentLength;

  739. 

  740.             if (filterCode)

  741.                 filterCode[fragmentPos] = RET;

  742.         }

  743.         xpos += xInc;

  744.     }

  745.     if (filterCode)

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

  747. 

  748.     return fragmentPos + 1;

  749. }

  750. #endif /* HAVE_MMX2 */

  751. 

  752. static void getSubSampleFactors(int *h, int *v, enum PixelFormat format)

  753. {

  754.     *h = av_pix_fmt_descriptors[format].log2_chroma_w;

  755.     *v = av_pix_fmt_descriptors[format].log2_chroma_h;

  756. }

  757. 

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

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

  760.                              int brightness, int contrast, int saturation)

  761. {

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

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

  764. 

  765.     c->brightness = brightness;

  766.     c->contrast   = contrast;

  767.     c->saturation = saturation;

  768.     c->srcRange   = srcRange;

  769.     c->dstRange   = dstRange;

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

  771.         return -1;

  772. 

  773.     c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[c->dstFormat]);

  774.     c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[c->srcFormat]);

  775. 

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

  777.                              contrast, saturation);

  778.     // FIXME factorize

  779. 

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

  781.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness,

  782.                                        contrast, saturation);

  783.     return 0;

  784. }

  785. 

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

  787.                              int *srcRange, int **table, int *dstRange,

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

  789. {

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

  791.         return -1;

  792. 

  793.     *inv_table  = c->srcColorspaceTable;

  794.     *table      = c->dstColorspaceTable;

  795.     *srcRange   = c->srcRange;

  796.     *dstRange   = c->dstRange;

  797.     *brightness = c->brightness;

  798.     *contrast   = c->contrast;

  799.     *saturation = c->saturation;

  800. 

  801.     return 0;

  802. }

  803. 

  804. static int handle_jpeg(enum PixelFormat *format)

  805. {

  806.     switch (*format) {

  807.     case PIX_FMT_YUVJ420P:

  808.         *format = PIX_FMT_YUV420P;

  809.         return 1;

  810.     case PIX_FMT_YUVJ422P:

  811.         *format = PIX_FMT_YUV422P;

  812.         return 1;

  813.     case PIX_FMT_YUVJ444P:

  814.         *format = PIX_FMT_YUV444P;

  815.         return 1;

  816.     case PIX_FMT_YUVJ440P:

  817.         *format = PIX_FMT_YUV440P;

  818.         return 1;

  819.     default:

  820.         return 0;

  821.     }

  822. }

  823. 

  824. static int handle_0alpha(enum PixelFormat *format)

  825. {

  826.     switch (*format) {

  827.     case PIX_FMT_0BGR    : *format = PIX_FMT_ABGR   ; return 1;

  828.     case PIX_FMT_BGR0    : *format = PIX_FMT_BGRA   ; return 4;

  829.     case PIX_FMT_0RGB    : *format = PIX_FMT_ARGB   ; return 1;

  830.     case PIX_FMT_RGB0    : *format = PIX_FMT_RGBA   ; return 4;

  831.     default:                                          return 0;

  832.     }

  833. }

  834. 

  835. SwsContext *sws_alloc_context(void)

  836. {

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

  838. 

  839.     c->av_class = &sws_context_class;

  840.     av_opt_set_defaults(c);

  841. 

  842.     return c;

  843. }

  844. 

  845. int sws_init_context(SwsContext *c, SwsFilter *srcFilter, SwsFilter *dstFilter)

  846. {

  847.     int i, j;

  848.     int usesVFilter, usesHFilter;

  849.     int unscaled;

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

  851.     int srcW              = c->srcW;

  852.     int srcH              = c->srcH;

  853.     int dstW              = c->dstW;

  854.     int dstH              = c->dstH;

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

  856.     int flags, cpu_flags;

  857.     enum PixelFormat srcFormat = c->srcFormat;

  858.     enum PixelFormat dstFormat = c->dstFormat;

  859. 

  860.     cpu_flags = av_get_cpu_flags();

  861.     flags     = c->flags;

  862.     emms_c();

  863.     if (!rgb15to16)

  864.         sws_rgb2rgb_init();

  865. 

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

  867. 

  868.     handle_jpeg(&srcFormat);

  869.     handle_jpeg(&dstFormat);

  870.     handle_0alpha(&srcFormat);

  871.     handle_0alpha(&dstFormat);

  872. 

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

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

  875.         c->srcFormat= srcFormat;

  876.         c->dstFormat= dstFormat;

  877.     }

  878. 

  879.     if (!sws_isSupportedInput(srcFormat)) {

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

  881.                av_get_pix_fmt_name(srcFormat));

  882.         return AVERROR(EINVAL);

  883.     }

  884.     if (!sws_isSupportedOutput(dstFormat)) {

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

  886.                av_get_pix_fmt_name(dstFormat));

  887.         return AVERROR(EINVAL);

  888.     }

  889. 

  890.     i = flags & (SWS_POINT         |

  891.                  SWS_AREA          |

  892.                  SWS_BILINEAR      |

  893.                  SWS_FAST_BILINEAR |

  894.                  SWS_BICUBIC       |

  895.                  SWS_X             |

  896.                  SWS_GAUSS         |

  897.                  SWS_LANCZOS       |

  898.                  SWS_SINC          |

  899.                  SWS_SPLINE        |

  900.                  SWS_BICUBLIN);

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

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

  903.         return AVERROR(EINVAL);

  904.     }

  905.     /* sanity check */

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

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

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

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

  910.                srcW, srcH, dstW, dstH);

  911.         return AVERROR(EINVAL);

  912.     }

  913. 

  914.     if (!dstFilter)

  915.         dstFilter = &dummyFilter;

  916.     if (!srcFilter)

  917.         srcFilter = &dummyFilter;

  918. 

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

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

  921.     c->dstFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[dstFormat]);

  922.     c->srcFormatBpp = av_get_bits_per_pixel(&av_pix_fmt_descriptors[srcFormat]);

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

  924. 

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

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

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

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

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

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

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

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

  933. 

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

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

  936. 

  937. 

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

  939.         if (dstW&1) {

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

  941.             flags |= SWS_FULL_CHR_H_INT;

  942.             c->flags = flags;

  943.         }

  944.     }

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

  946.      * chroma interpolation */

  947.     if (flags & SWS_FULL_CHR_H_INT &&

  948.         isAnyRGB(dstFormat)        &&

  949.         dstFormat != PIX_FMT_RGBA  &&

  950.         dstFormat != PIX_FMT_ARGB  &&

  951.         dstFormat != PIX_FMT_BGRA  &&

  952.         dstFormat != PIX_FMT_ABGR  &&

  953.         dstFormat != PIX_FMT_RGB24 &&

  954.         dstFormat != PIX_FMT_BGR24) {

  955.         av_log(c, AV_LOG_WARNING,

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

  957.                av_get_pix_fmt_name(dstFormat));

  958.         flags   &= ~SWS_FULL_CHR_H_INT;

  959.         c->flags = flags;

  960.     }

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

  962.         c->chrDstHSubSample = 1;

  963. 

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

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

  966.                            SWS_SRC_V_CHR_DROP_SHIFT;

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

  968. 

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

  970.      * wants full chroma */

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

  972.         srcFormat != PIX_FMT_RGB8 && srcFormat != PIX_FMT_BGR8 &&

  973.         srcFormat != PIX_FMT_RGB4 && srcFormat != PIX_FMT_BGR4 &&

  974.         srcFormat != PIX_FMT_RGB4_BYTE && srcFormat != PIX_FMT_BGR4_BYTE &&

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

  976.          (flags & SWS_FAST_BILINEAR)))

  977.         c->chrSrcHSubSample = 1;

  978. 

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

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

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

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

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

  984. 

  985.     /* unscaled special cases */

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

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

  988.         ff_get_unscaled_swscale(c);

  989. 

  990.         if (c->swScale) {

  991.             if (flags & SWS_PRINT_INFO)

  992.                 av_log(c, AV_LOG_INFO,

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

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

  995.             return 0;

  996.         }

  997.     }

  998. 

  999.     c->srcBpc = 1 + av_pix_fmt_descriptors[srcFormat].comp[0].depth_minus1;

  1000.     if (c->srcBpc < 8)

  1001.         c->srcBpc = 8;

  1002.     c->dstBpc = 1 + av_pix_fmt_descriptors[dstFormat].comp[0].depth_minus1;

  1003.     if (c->dstBpc < 8)

  1004.         c->dstBpc = 8;

  1005.     if (isAnyRGB(srcFormat) || srcFormat == PIX_FMT_PAL8)

  1006.         c->srcBpc = 16;

  1007.     if (c->dstBpc == 16)

  1008.         dst_stride <<= 1;

  1009.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer, FFALIGN(srcW*2+78, 16) * 2, fail);

  1010.     if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2 &&

  1011.         c->srcBpc == 8 && c->dstBpc <= 10) {

  1012.         c->canMMX2BeUsed = (dstW >= srcW && (dstW & 31) == 0 &&

  1013.                             (srcW & 15) == 0) ? 1 : 0;

  1014.         if (!c->canMMX2BeUsed && dstW >= srcW && (srcW & 15) == 0

  1015.             && (flags & SWS_FAST_BILINEAR)) {

  1016.             if (flags & SWS_PRINT_INFO)

  1017.                 av_log(c, AV_LOG_INFO,

  1018.                        "output width is not a multiple of 32 -> no MMX2 scaler\n");

  1019.         }

  1020.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat))

  1021.             c->canMMX2BeUsed=0;

  1022.     } else

  1023.         c->canMMX2BeUsed = 0;

  1024. 

  1025.     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;

  1026.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1027. 

  1028.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1029.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1030.      * correct scaling.

  1031.      * n-2 is the last chrominance sample available.

  1032.      * This is not perfect, but no one should notice the difference, the more

  1033.      * correct variant would be like the vertical one, but that would require

  1034.      * some special code for the first and last pixel */

  1035.     if (flags & SWS_FAST_BILINEAR) {

  1036.         if (c->canMMX2BeUsed) {

  1037.             c->lumXInc += 20;

  1038.             c->chrXInc += 20;

  1039.         }

  1040.         // we don't use the x86 asm scaler if MMX is available

  1041.         else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX && c->dstBpc <= 10) {

  1042.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1043.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1044.         }

  1045.     }

  1046. 

  1047.     /* precalculate horizontal scaler filter coefficients */

  1048.     {

  1049. #if HAVE_MMX2

  1050. // can't downscale !!!

  1051.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1052.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1053.                                                        NULL, NULL, 8);

  1054.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1055.                                                        NULL, NULL, NULL, 4);

  1056. 

  1057. #ifdef MAP_ANONYMOUS

  1058.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1059.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1060. #elif HAVE_VIRTUALALLOC

  1061.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1062.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1063. #else

  1064.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1065.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1066. #endif

  1067. 

  1068. #ifdef MAP_ANONYMOUS

  1069.             if (c->lumMmx2FilterCode == MAP_FAILED || c->chrMmx2FilterCode == MAP_FAILED)

  1070. #else

  1071.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1072. #endif

  1073.             {

  1074.                 av_log(c, AV_LOG_ERROR, "Failed to allocate MMX2FilterCode\n");

  1075.                 return AVERROR(ENOMEM);

  1076.             }

  1077. 

  1078.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1079.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1080.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1081.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1082. 

  1083.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode,

  1084.                             c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  1085.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1086.                             c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  1087. 

  1088. #ifdef MAP_ANONYMOUS

  1089.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1090.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1091. #endif

  1092.         } else

  1093. #endif /* HAVE_MMX2 */

  1094.         {

  1095.             const int filterAlign =

  1096.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1097.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1098.                 1;

  1099. 

  1100.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1101.                            &c->hLumFilterSize, c->lumXInc,

  1102.                            srcW, dstW, filterAlign, 1 << 14,

  1103.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1104.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1105.                            c->param) < 0)

  1106.                 goto fail;

  1107.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1108.                            &c->hChrFilterSize, c->chrXInc,

  1109.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1110.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1111.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1112.                            c->param) < 0)

  1113.                 goto fail;

  1114.         }

  1115.     } // initialize horizontal stuff

  1116. 

  1117.     /* precalculate vertical scaler filter coefficients */

  1118.     {

  1119.         const int filterAlign =

  1120.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1121.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1122.             1;

  1123. 

  1124.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1125.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1126.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1127.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1128.                        c->param) < 0)

  1129.             goto fail;

  1130.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1131.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1132.                        filterAlign, (1 << 12),

  1133.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1134.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1135.                        c->param) < 0)

  1136.             goto fail;

  1137. 

  1138. #if HAVE_ALTIVEC

  1139.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1140.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1141. 

  1142.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1143.             int j;

  1144.             short *p = (short *)&c->vYCoeffsBank[i];

  1145.             for (j = 0; j < 8; j++)

  1146.                 p[j] = c->vLumFilter[i];

  1147.         }

  1148. 

  1149.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1150.             int j;

  1151.             short *p = (short *)&c->vCCoeffsBank[i];

  1152.             for (j = 0; j < 8; j++)

  1153.                 p[j] = c->vChrFilter[i];

  1154.         }

  1155. #endif

  1156.     }

  1157. 

  1158.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1159.     c->vLumBufSize = c->vLumFilterSize;

  1160.     c->vChrBufSize = c->vChrFilterSize;

  1161.     for (i = 0; i < dstH; i++) {

  1162.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1163.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1164.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1165.                                << c->chrSrcVSubSample));

  1166. 

  1167.         nextSlice >>= c->chrSrcVSubSample;

  1168.         nextSlice <<= c->chrSrcVSubSample;

  1169.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1170.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1171.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1172.             (nextSlice >> c->chrSrcVSubSample))

  1173.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1174.                              c->vChrFilterPos[chrI];

  1175.     }

  1176. 

  1177.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1178.      * need to allocate several megabytes to handle all possible cases) */

  1179.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1180.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1181.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1182.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1183.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1184.     /* Note we need at least one pixel more at the end because of the MMX code

  1185.      * (just in case someone wants to replace the 4000/8000). */

  1186.     /* align at 16 bytes for AltiVec */

  1187.     for (i = 0; i < c->vLumBufSize; i++) {

  1188.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1189.                           dst_stride + 16, fail);

  1190.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1191.     }

  1192.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1193.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1194.     c->uv_offx2 = dst_stride + 16;

  1195.     for (i = 0; i < c->vChrBufSize; i++) {

  1196.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1197.                          dst_stride * 2 + 32, fail);

  1198.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1199.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1200.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1201.     }

  1202.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1203.         for (i = 0; i < c->vLumBufSize; i++) {

  1204.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1205.                               dst_stride + 16, fail);

  1206.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1207.         }

  1208. 

  1209.     // try to avoid drawing green stuff between the right end and the stride end

  1210.     for (i = 0; i < c->vChrBufSize; i++)

  1211.         if(av_pix_fmt_descriptors[c->dstFormat].comp[0].depth_minus1 == 15){

  1212.             av_assert0(c->dstBpc > 10);

  1213.             for(j=0; j<dst_stride/2+1; j++)

  1214.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1215.         } else

  1216.             for(j=0; j<dst_stride+1; j++)

  1217.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1218. 

  1219.     assert(c->chrDstH <= dstH);

  1220. 

  1221.     if (flags & SWS_PRINT_INFO) {

  1222.         if (flags & SWS_FAST_BILINEAR)

  1223.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1224.         else if (flags & SWS_BILINEAR)

  1225.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1226.         else if (flags & SWS_BICUBIC)

  1227.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1228.         else if (flags & SWS_X)

  1229.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1230.         else if (flags & SWS_POINT)

  1231.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1232.         else if (flags & SWS_AREA)

  1233.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1234.         else if (flags & SWS_BICUBLIN)

  1235.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1236.         else if (flags & SWS_GAUSS)

  1237.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1238.         else if (flags & SWS_SINC)

  1239.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1240.         else if (flags & SWS_LANCZOS)

  1241.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1242.         else if (flags & SWS_SPLINE)

  1243.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1244.         else

  1245.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1246. 

  1247.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1248.                av_get_pix_fmt_name(srcFormat),

  1249. #ifdef DITHER1XBPP

  1250.                dstFormat == PIX_FMT_BGR555   || dstFormat == PIX_FMT_BGR565   ||

  1251.                dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1252.                dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ?

  1253.                                                              "dithered " : "",

  1254. #else

  1255.                "",

  1256. #endif

  1257.                av_get_pix_fmt_name(dstFormat));

  1258. 

  1259.         if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2)

  1260.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1261.         else if (HAVE_AMD3DNOW && cpu_flags & AV_CPU_FLAG_3DNOW)

  1262.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1263.         else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX)

  1264.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1265.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1266.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1267.         else

  1268.             av_log(c, AV_LOG_INFO, "using C\n");

  1269. 

  1270.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1271.         av_log(c, AV_LOG_DEBUG,

  1272.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1273.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1274.         av_log(c, AV_LOG_DEBUG,

  1275.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1276.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1277.                c->chrXInc, c->chrYInc);

  1278.     }

  1279. 

  1280.     c->swScale = ff_getSwsFunc(c);

  1281.     return 0;

  1282. fail: // FIXME replace things by appropriate error codes

  1283.     return -1;

  1284. }

  1285. 

  1286. #if FF_API_SWS_GETCONTEXT

  1287. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  1288.                            int dstW, int dstH, enum PixelFormat dstFormat,

  1289.                            int flags, SwsFilter *srcFilter,

  1290.                            SwsFilter *dstFilter, const double *param)

  1291. {

  1292.     SwsContext *c;

  1293. 

  1294.     if (!(c = sws_alloc_context()))

  1295.         return NULL;

  1296. 

  1297.     c->flags     = flags;

  1298.     c->srcW      = srcW;

  1299.     c->srcH      = srcH;

  1300.     c->dstW      = dstW;

  1301.     c->dstH      = dstH;

  1302.     c->srcRange  = handle_jpeg(&srcFormat);

  1303.     c->dstRange  = handle_jpeg(&dstFormat);

  1304.     c->src0Alpha = handle_0alpha(&srcFormat);

  1305.     c->dst0Alpha = handle_0alpha(&dstFormat);

  1306.     c->srcFormat = srcFormat;

  1307.     c->dstFormat = dstFormat;

  1308. 

  1309.     if (param) {

  1310.         c->param[0] = param[0];

  1311.         c->param[1] = param[1];

  1312.     }

  1313.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1314.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1315.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1316. 

  1317.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1318.         sws_freeContext(c);

  1319.         return NULL;

  1320.     }

  1321. 

  1322.     return c;

  1323. }

  1324. #endif

  1325. 

  1326. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1327.                                 float lumaSharpen, float chromaSharpen,

  1328.                                 float chromaHShift, float chromaVShift,

  1329.                                 int verbose)

  1330. {

  1331.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1332.     if (!filter)

  1333.         return NULL;

  1334. 

  1335.     if (lumaGBlur != 0.0) {

  1336.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1337.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1338.     } else {

  1339.         filter->lumH = sws_getIdentityVec();

  1340.         filter->lumV = sws_getIdentityVec();

  1341.     }

  1342. 

  1343.     if (chromaGBlur != 0.0) {

  1344.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1345.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1346.     } else {

  1347.         filter->chrH = sws_getIdentityVec();

  1348.         filter->chrV = sws_getIdentityVec();

  1349.     }

  1350. 

  1351.     if (chromaSharpen != 0.0) {

  1352.         SwsVector *id = sws_getIdentityVec();

  1353.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1354.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1355.         sws_addVec(filter->chrH, id);

  1356.         sws_addVec(filter->chrV, id);

  1357.         sws_freeVec(id);

  1358.     }

  1359. 

  1360.     if (lumaSharpen != 0.0) {

  1361.         SwsVector *id = sws_getIdentityVec();

  1362.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1363.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1364.         sws_addVec(filter->lumH, id);

  1365.         sws_addVec(filter->lumV, id);

  1366.         sws_freeVec(id);

  1367.     }

  1368. 

  1369.     if (chromaHShift != 0.0)

  1370.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1371. 

  1372.     if (chromaVShift != 0.0)

  1373.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1374. 

  1375.     sws_normalizeVec(filter->chrH, 1.0);

  1376.     sws_normalizeVec(filter->chrV, 1.0);

  1377.     sws_normalizeVec(filter->lumH, 1.0);

  1378.     sws_normalizeVec(filter->lumV, 1.0);

  1379. 

  1380.     if (verbose)

  1381.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1382.     if (verbose)

  1383.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1384. 

  1385.     return filter;

  1386. }

  1387. 

  1388. SwsVector *sws_allocVec(int length)

  1389. {

  1390.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1391.     if (!vec)

  1392.         return NULL;

  1393.     vec->length = length;

  1394.     vec->coeff  = av_malloc(sizeof(double) * length);

  1395.     if (!vec->coeff)

  1396.         av_freep(&vec);

  1397.     return vec;

  1398. }

  1399. 

  1400. SwsVector *sws_getGaussianVec(double variance, double quality)

  1401. {

  1402.     const int length = (int)(variance * quality + 0.5) | 1;

  1403.     int i;

  1404.     double middle  = (length - 1) * 0.5;

  1405.     SwsVector *vec = sws_allocVec(length);

  1406. 

  1407.     if (!vec)

  1408.         return NULL;

  1409. 

  1410.     for (i = 0; i < length; i++) {

  1411.         double dist = i - middle;

  1412.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1413.                         sqrt(2 * variance * M_PI);

  1414.     }

  1415. 

  1416.     sws_normalizeVec(vec, 1.0);

  1417. 

  1418.     return vec;

  1419. }

  1420. 

  1421. SwsVector *sws_getConstVec(double c, int length)

  1422. {

  1423.     int i;

  1424.     SwsVector *vec = sws_allocVec(length);

  1425. 

  1426.     if (!vec)

  1427.         return NULL;

  1428. 

  1429.     for (i = 0; i < length; i++)

  1430.         vec->coeff[i] = c;

  1431. 

  1432.     return vec;

  1433. }

  1434. 

  1435. SwsVector *sws_getIdentityVec(void)

  1436. {

  1437.     return sws_getConstVec(1.0, 1);

  1438. }

  1439. 

  1440. static double sws_dcVec(SwsVector *a)

  1441. {

  1442.     int i;

  1443.     double sum = 0;

  1444. 

  1445.     for (i = 0; i < a->length; i++)

  1446.         sum += a->coeff[i];

  1447. 

  1448.     return sum;

  1449. }

  1450. 

  1451. void sws_scaleVec(SwsVector *a, double scalar)

  1452. {

  1453.     int i;

  1454. 

  1455.     for (i = 0; i < a->length; i++)

  1456.         a->coeff[i] *= scalar;

  1457. }

  1458. 

  1459. void sws_normalizeVec(SwsVector *a, double height)

  1460. {

  1461.     sws_scaleVec(a, height / sws_dcVec(a));

  1462. }

  1463. 

  1464. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1465. {

  1466.     int length = a->length + b->length - 1;

  1467.     int i, j;

  1468.     SwsVector *vec = sws_getConstVec(0.0, length);

  1469. 

  1470.     if (!vec)

  1471.         return NULL;

  1472. 

  1473.     for (i = 0; i < a->length; i++) {

  1474.         for (j = 0; j < b->length; j++) {

  1475.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1476.         }

  1477.     }

  1478. 

  1479.     return vec;

  1480. }

  1481. 

  1482. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1483. {

  1484.     int length = FFMAX(a->length, b->length);

  1485.     int i;

  1486.     SwsVector *vec = sws_getConstVec(0.0, length);

  1487. 

  1488.     if (!vec)

  1489.         return NULL;

  1490. 

  1491.     for (i = 0; i < a->length; i++)

  1492.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1493.     for (i = 0; i < b->length; i++)

  1494.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1495. 

  1496.     return vec;

  1497. }

  1498. 

  1499. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1500. {

  1501.     int length = FFMAX(a->length, b->length);

  1502.     int i;

  1503.     SwsVector *vec = sws_getConstVec(0.0, length);

  1504. 

  1505.     if (!vec)

  1506.         return NULL;

  1507. 

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

  1509.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

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

  1511.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1512. 

  1513.     return vec;

  1514. }

  1515. 

  1516. /* shift left / or right if "shift" is negative */

  1517. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1518. {

  1519.     int length = a->length + FFABS(shift) * 2;

  1520.     int i;

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

  1528.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1529.     }

  1530. 

  1531.     return vec;

  1532. }

  1533. 

  1534. void sws_shiftVec(SwsVector *a, int shift)

  1535. {

  1536.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1537.     av_free(a->coeff);

  1538.     a->coeff  = shifted->coeff;

  1539.     a->length = shifted->length;

  1540.     av_free(shifted);

  1541. }

  1542. 

  1543. void sws_addVec(SwsVector *a, SwsVector *b)

  1544. {

  1545.     SwsVector *sum = sws_sumVec(a, b);

  1546.     av_free(a->coeff);

  1547.     a->coeff  = sum->coeff;

  1548.     a->length = sum->length;

  1549.     av_free(sum);

  1550. }

  1551. 

  1552. void sws_subVec(SwsVector *a, SwsVector *b)

  1553. {

  1554.     SwsVector *diff = sws_diffVec(a, b);

  1555.     av_free(a->coeff);

  1556.     a->coeff  = diff->coeff;

  1557.     a->length = diff->length;

  1558.     av_free(diff);

  1559. }

  1560. 

  1561. void sws_convVec(SwsVector *a, SwsVector *b)

  1562. {

  1563.     SwsVector *conv = sws_getConvVec(a, b);

  1564.     av_free(a->coeff);

  1565.     a->coeff  = conv->coeff;

  1566.     a->length = conv->length;

  1567.     av_free(conv);

  1568. }

  1569. 

  1570. SwsVector *sws_cloneVec(SwsVector *a)

  1571. {

  1572.     int i;

  1573.     SwsVector *vec = sws_allocVec(a->length);

  1574. 

  1575.     if (!vec)

  1576.         return NULL;

  1577. 

  1578.     for (i = 0; i < a->length; i++)

  1579.         vec->coeff[i] = a->coeff[i];

  1580. 

  1581.     return vec;

  1582. }

  1583. 

  1584. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1585. {

  1586.     int i;

  1587.     double max = 0;

  1588.     double min = 0;

  1589.     double range;

  1590. 

  1591.     for (i = 0; i < a->length; i++)

  1592.         if (a->coeff[i] > max)

  1593.             max = a->coeff[i];

  1594. 

  1595.     for (i = 0; i < a->length; i++)

  1596.         if (a->coeff[i] < min)

  1597.             min = a->coeff[i];

  1598. 

  1599.     range = max - min;

  1600. 

  1601.     for (i = 0; i < a->length; i++) {

  1602.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1603.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1604.         for (; x > 0; x--)

  1605.             av_log(log_ctx, log_level, " ");

  1606.         av_log(log_ctx, log_level, "|\n");

  1607.     }

  1608. }

  1609. 

  1610. void sws_freeVec(SwsVector *a)

  1611. {

  1612.     if (!a)

  1613.         return;

  1614.     av_freep(&a->coeff);

  1615.     a->length = 0;

  1616.     av_free(a);

  1617. }

  1618. 

  1619. void sws_freeFilter(SwsFilter *filter)

  1620. {

  1621.     if (!filter)

  1622.         return;

  1623. 

  1624.     if (filter->lumH)

  1625.         sws_freeVec(filter->lumH);

  1626.     if (filter->lumV)

  1627.         sws_freeVec(filter->lumV);

  1628.     if (filter->chrH)

  1629.         sws_freeVec(filter->chrH);

  1630.     if (filter->chrV)

  1631.         sws_freeVec(filter->chrV);

  1632.     av_free(filter);

  1633. }

  1634. 

  1635. void sws_freeContext(SwsContext *c)

  1636. {

  1637.     int i;

  1638.     if (!c)

  1639.         return;

  1640. 

  1641.     if (c->lumPixBuf) {

  1642.         for (i = 0; i < c->vLumBufSize; i++)

  1643.             av_freep(&c->lumPixBuf[i]);

  1644.         av_freep(&c->lumPixBuf);

  1645.     }

  1646. 

  1647.     if (c->chrUPixBuf) {

  1648.         for (i = 0; i < c->vChrBufSize; i++)

  1649.             av_freep(&c->chrUPixBuf[i]);

  1650.         av_freep(&c->chrUPixBuf);

  1651.         av_freep(&c->chrVPixBuf);

  1652.     }

  1653. 

  1654.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1655.         for (i = 0; i < c->vLumBufSize; i++)

  1656.             av_freep(&c->alpPixBuf[i]);

  1657.         av_freep(&c->alpPixBuf);

  1658.     }

  1659. 

  1660.     av_freep(&c->vLumFilter);

  1661.     av_freep(&c->vChrFilter);

  1662.     av_freep(&c->hLumFilter);

  1663.     av_freep(&c->hChrFilter);

  1664. #if HAVE_ALTIVEC

  1665.     av_freep(&c->vYCoeffsBank);

  1666.     av_freep(&c->vCCoeffsBank);

  1667. #endif

  1668. 

  1669.     av_freep(&c->vLumFilterPos);

  1670.     av_freep(&c->vChrFilterPos);

  1671.     av_freep(&c->hLumFilterPos);

  1672.     av_freep(&c->hChrFilterPos);

  1673. 

  1674. #if HAVE_MMX

  1675. #ifdef MAP_ANONYMOUS

  1676.     if (c->lumMmx2FilterCode)

  1677.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1678.     if (c->chrMmx2FilterCode)

  1679.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1680. #elif HAVE_VIRTUALALLOC

  1681.     if (c->lumMmx2FilterCode)

  1682.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1683.     if (c->chrMmx2FilterCode)

  1684.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1685. #else

  1686.     av_free(c->lumMmx2FilterCode);

  1687.     av_free(c->chrMmx2FilterCode);

  1688. #endif

  1689.     c->lumMmx2FilterCode = NULL;

  1690.     c->chrMmx2FilterCode = NULL;

  1691. #endif /* HAVE_MMX */

  1692. 

  1693.     av_freep(&c->yuvTable);

  1694.     av_freep(&c->formatConvBuffer);

  1695. 

  1696.     av_free(c);

  1697. }

  1698. 

  1699. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1700.                                         int srcH, enum PixelFormat srcFormat,

  1701.                                         int dstW, int dstH,

  1702.                                         enum PixelFormat dstFormat, int flags,

  1703.                                         SwsFilter *srcFilter,

  1704.                                         SwsFilter *dstFilter,

  1705.                                         const double *param)

  1706. {

  1707.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1708.                                              SWS_PARAM_DEFAULT };

  1709. 

  1710.     if (!param)

  1711.         param = default_param;

  1712. 

  1713.     if (context &&

  1714.         (context->srcW      != srcW      ||

  1715.          context->srcH      != srcH      ||

  1716.          context->srcFormat != srcFormat ||

  1717.          context->dstW      != dstW      ||

  1718.          context->dstH      != dstH      ||

  1719.          context->dstFormat != dstFormat ||

  1720.          context->flags     != flags     ||

  1721.          context->param[0]  != param[0]  ||

  1722.          context->param[1]  != param[1])) {

  1723.         sws_freeContext(context);

  1724.         context = NULL;

  1725.     }

  1726. 

  1727.     if (!context) {

  1728.         if (!(context = sws_alloc_context()))

  1729.             return NULL;

  1730.         context->srcW      = srcW;

  1731.         context->srcH      = srcH;

  1732.         context->srcRange  = handle_jpeg(&srcFormat);

  1733.         context->src0Alpha = handle_0alpha(&srcFormat);

  1734.         context->srcFormat = srcFormat;

  1735.         context->dstW      = dstW;

  1736.         context->dstH      = dstH;

  1737.         context->dstRange  = handle_jpeg(&dstFormat);

  1738.         context->dst0Alpha = handle_0alpha(&dstFormat);

  1739.         context->dstFormat = dstFormat;

  1740.         context->flags     = flags;

  1741.         context->param[0]  = param[0];

  1742.         context->param[1]  = param[1];

  1743.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1744.                                  context->srcRange,

  1745.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1746.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1747.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1748.             sws_freeContext(context);

  1749.             return NULL;

  1750.         }

  1751.     }

  1752.     return context;

  1753. }