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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/x86/asm.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.     return LIBSWSCALE_VERSION_INT;

  57. }

  58. 

  59. const char *swscale_configuration(void)

  60. {

  61.     return LIBAV_CONFIGURATION;

  62. }

  63. 

  64. const char *swscale_license(void)

  65. {

  66. #define LICENSE_PREFIX "libswscale license: "

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

  68. }

  69. 

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

  71. 

  72. typedef struct FormatEntry {

  73.     int is_supported_in, is_supported_out;

  74. } FormatEntry;

  75. 

  76. static const FormatEntry format_entries[AV_PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  155. };

  156. 

  157. int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

  158. {

  159.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  160.            format_entries[pix_fmt].is_supported_in : 0;

  161. }

  162. 

  163. int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

  164. {

  165.     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

  166.            format_entries[pix_fmt].is_supported_out : 0;

  167. }

  168. 

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

  170. 

  171. const char *sws_format_name(enum AVPixelFormat format)

  172. {

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

  174.     if (desc)

  175.         return desc->name;

  176.     else

  177.         return "Unknown format";

  178. }

  179. 

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

  181.                              double dist)

  182. {

  183.     if (dist <= 1.0)

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

  185.     else

  186.         return getSplineCoeff(0.0,

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

  188.                                c + 3.0 * d,

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

  190.                               dist - 1.0);

  191. }

  192. 

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

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

  195.                       int filterAlign, int one, int flags, int cpu_flags,

  196.                       SwsVector *srcFilter, SwsVector *dstFilter,

  197.                       double param[2], int is_horizontal)

  198. {

  199.     int i;

  200.     int filterSize;

  201.     int filter2Size;

  202.     int minFilterSize;

  203.     int64_t *filter    = NULL;

  204.     int64_t *filter2   = NULL;

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

  206.     int ret            = -1;

  207. 

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

  209. 

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

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

  212. 

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

  214.         int i;

  215.         filterSize = 1;

  216.         FF_ALLOCZ_OR_GOTO(NULL, filter,

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

  218. 

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

  220.             filter[i * filterSize] = fone;

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

  222.         }

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

  224.         int i;

  225.         int xDstInSrc;

  226.         filterSize = 1;

  227.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  229. 

  230.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  233. 

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

  235.             filter[i]       = fone;

  236.             xDstInSrc      += xInc;

  237.         }

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

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

  240.         int i;

  241.         int xDstInSrc;

  242.         filterSize = 2;

  243.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  245. 

  246.         xDstInSrc = xInc / 2 - 0x8000;

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

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

  249.             int j;

  250. 

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

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

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

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

  255.                                 (fone >> 16);

  256.                 if (coeff < 0)

  257.                     coeff = 0;

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

  259.                 xx++;

  260.             }

  261.             xDstInSrc += xInc;

  262.         }

  263.     } else {

  264.         int64_t xDstInSrc;

  265.         int sizeFactor;

  266. 

  267.         if (flags & SWS_BICUBIC)

  268.             sizeFactor = 4;

  269.         else if (flags & SWS_X)

  270.             sizeFactor = 8;

  271.         else if (flags & SWS_AREA)

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

  273.         else if (flags & SWS_GAUSS)

  274.             sizeFactor = 8;     // infinite ;)

  275.         else if (flags & SWS_LANCZOS)

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

  277.         else if (flags & SWS_SINC)

  278.             sizeFactor = 20;    // infinite ;)

  279.         else if (flags & SWS_SPLINE)

  280.             sizeFactor = 20;    // infinite ;)

  281.         else if (flags & SWS_BILINEAR)

  282.             sizeFactor = 2;

  283.         else {

  284.             sizeFactor = 0;     // GCC warning killer

  285.             assert(0);

  286.         }

  287. 

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

  289.             filterSize = 1 + sizeFactor;    // upscale

  290.         else

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

  292. 

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

  294.         filterSize = FFMAX(filterSize, 1);

  295. 

  296.         FF_ALLOC_OR_GOTO(NULL, filter,

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

  298. 

  299.         xDstInSrc = xInc - 0x10000;

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

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

  302.             int j;

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

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

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

  306.                 double floatd;

  307.                 int64_t coeff;

  308. 

  309.                 if (xInc > 1 << 16)

  310.                     d = d * dstW / srcW;

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

  312. 

  313.                 if (flags & SWS_BICUBIC) {

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

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

  316. 

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

  318.                         coeff = 0.0;

  319.                     } else {

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

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

  322. 

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

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

  325.                                     (-18 * (1 << 24) + 12 * B + 6 * C) *  dd +

  326.                                       (6 * (1 << 24) -  2 * B)         * (1 << 30);

  327.                         else

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

  329.                                       (6 * B + 30 * C) * dd  +

  330.                                     (-12 * B - 48 * C) * d   +

  331.                                       (8 * B + 24 * C) * (1 << 30);

  332.                     }

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

  334.                 }

  335. #if 0

  336.                 else if (flags & SWS_X) {

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

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

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

  340.                 }

  341. #endif

  342.                 else if (flags & SWS_X) {

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

  344.                     double c;

  345. 

  346.                     if (floatd < 1.0)

  347.                         c = cos(floatd * M_PI);

  348.                     else

  349.                         c = -1.0;

  350.                     if (c < 0.0)

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

  352.                     else

  353.                         c = pow(c, A);

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

  355.                 } else if (flags & SWS_AREA) {

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

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

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

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

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

  361.                     else

  362.                         coeff = 0.0;

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

  364.                 } else if (flags & SWS_GAUSS) {

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

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

  367.                 } else if (flags & SWS_SINC) {

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

  369.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  373.                     if (floatd > p)

  374.                         coeff = 0;

  375.                 } else if (flags & SWS_BILINEAR) {

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

  377.                     if (coeff < 0)

  378.                         coeff = 0;

  379.                     coeff *= fone >> 30;

  380.                 } else if (flags & SWS_SPLINE) {

  381.                     double p = -2.196152422706632;

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

  383.                 } else {

  384.                     coeff = 0.0; // GCC warning killer

  385.                     assert(0);

  386.                 }

  387. 

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

  389.                 xx++;

  390.             }

  391.             xDstInSrc += 2 * xInc;

  392.         }

  393.     }

  394. 

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

  396.      * av_free(filter);

  397.      */

  398.     assert(filterSize > 0);

  399.     filter2Size = filterSize;

  400.     if (srcFilter)

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

  402.     if (dstFilter)

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

  404.     assert(filter2Size > 0);

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

  406. 

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

  408.         int j, k;

  409. 

  410.         if (srcFilter) {

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

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

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

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

  415.             }

  416.         } else {

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

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

  419.         }

  420.         // FIXME dstFilter

  421. 

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

  423.     }

  424.     av_freep(&filter);

  425. 

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

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

  428.     minFilterSize = 0;

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

  430.         int min = filter2Size;

  431.         int j;

  432.         int64_t cutOff = 0.0;

  433. 

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

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

  436.             int k;

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

  438. 

  439.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  440.                 break;

  441. 

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

  443.              * filter otherwise */

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

  445.                 break;

  446. 

  447.             // move filter coefficients left

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

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

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

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

  452.         }

  453. 

  454.         cutOff = 0;

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

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

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

  458. 

  459.             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)

  460.                 break;

  461.             min--;

  462.         }

  463. 

  464.         if (min > minFilterSize)

  465.             minFilterSize = min;

  466.     }

  467. 

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

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

  470.         if (minFilterSize < 5)

  471.             filterAlign = 4;

  472. 

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

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

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

  476.         if (minFilterSize < 3)

  477.             filterAlign = 1;

  478.     }

  479. 

  480.     if (INLINE_MMX(cpu_flags)) {

  481.         // special case for unscaled vertical filtering

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

  483.             filterAlign = 1;

  484.     }

  485. 

  486.     assert(minFilterSize > 0);

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

  488.     assert(filterSize > 0);

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

  490.     if (filterSize >= MAX_FILTER_SIZE * 16 /

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

  492.         goto fail;

  493.     *outFilterSize = filterSize;

  494. 

  495.     if (flags & SWS_PRINT_INFO)

  496.         av_log(NULL, AV_LOG_VERBOSE,

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

  498.                filter2Size, filterSize);

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

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

  501.         int j;

  502. 

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

  504.             if (j >= filter2Size)

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

  506.             else

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

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

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

  510.         }

  511.     }

  512. 

  513.     // FIXME try to align filterPos if possible

  514. 

  515.     // fix borders

  516.     if (is_horizontal) {

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

  518.             int j;

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

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

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

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

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

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

  525.                 }

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

  527.             }

  528. 

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

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

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

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

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

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

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

  536.                 }

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

  538.             }

  539.         }

  540.     }

  541. 

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

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

  544.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter,

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

  546. 

  547.     /* normalize & store in outFilter */

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

  549.         int j;

  550.         int64_t error = 0;

  551.         int64_t sum   = 0;

  552. 

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

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

  555.         }

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

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

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

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

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

  561.             error                                  = v - intV * sum;

  562.         }

  563.     }

  564. 

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

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

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

  568.                                                       * read over the end */

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

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

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

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

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

  574.     }

  575. 

  576.     ret = 0;

  577. 

  578. fail:

  579.     av_free(filter);

  580.     av_free(filter2);

  581.     return ret;

  582. }

  583. 

  584. #if HAVE_MMXEXT_INLINE

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

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

  587. {

  588.     uint8_t *fragmentA;

  589.     x86_reg imm8OfPShufW1A;

  590.     x86_reg imm8OfPShufW2A;

  591.     x86_reg fragmentLengthA;

  592.     uint8_t *fragmentB;

  593.     x86_reg imm8OfPShufW1B;

  594.     x86_reg imm8OfPShufW2B;

  595.     x86_reg fragmentLengthB;

  596.     int fragmentPos;

  597. 

  598.     int xpos, i;

  599. 

  600.     // create an optimized horizontal scaling routine

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

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

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

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

  605.      */

  606. 

  607.     // code fragment

  608. 

  609.     __asm__ volatile (

  610.         "jmp                         9f                 \n\t"

  611.         // Begin

  612.         "0:                                             \n\t"

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

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

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

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

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

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

  619.         "1:                                             \n\t"

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

  621.         "2:                                             \n\t"

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

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

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

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

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

  627. 

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

  629. 

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

  631.         // End

  632.         "9:                                             \n\t"

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

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

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

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

  637.         "dec                         %1                 \n\t"

  638.         "dec                         %2                 \n\t"

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

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

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

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

  643. 

  644. 

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

  646.           "=r" (fragmentLengthA)

  647.         );

  648. 

  649.     __asm__ volatile (

  650.         "jmp                         9f                 \n\t"

  651.         // Begin

  652.         "0:                                             \n\t"

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

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

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

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

  657.         "1:                                             \n\t"

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

  659.         "2:                                             \n\t"

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

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

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

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

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

  665. 

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

  667. 

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

  669.         // End

  670.         "9:                                             \n\t"

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

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

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

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

  675.         "dec                         %1                 \n\t"

  676.         "dec                         %2                 \n\t"

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

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

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

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

  681. 

  682. 

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

  684.           "=r" (fragmentLengthB)

  685.         );

  686. 

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

  688.     fragmentPos = 0;

  689. 

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

  691.         int xx = xpos >> 16;

  692. 

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

  694.             int a                  = 0;

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

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

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

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

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

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

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

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

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

  704.             int shift              = 0;

  705. 

  706.             if (filterCode) {

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

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

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

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

  711.                 filterPos[i / 2] = xx;

  712. 

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

  714. 

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

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

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

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

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

  720.                                                                (c << 4) |

  721.                                                                (d << 6);

  722. 

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

  724.                     shift = maxShift;               // avoid overread

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

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

  727. 

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

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

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

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

  732.                 }

  733.             }

  734. 

  735.             fragmentPos += fragmentLength;

  736. 

  737.             if (filterCode)

  738.                 filterCode[fragmentPos] = RET;

  739.         }

  740.         xpos += xInc;

  741.     }

  742.     if (filterCode)

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

  744. 

  745.     return fragmentPos + 1;

  746. }

  747. #endif /* HAVE_MMXEXT_INLINE */

  748. 

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

  750. {

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

  752.     *h = desc->log2_chroma_w;

  753.     *v = desc->log2_chroma_h;

  754. }

  755. 

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

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

  758.                              int brightness, int contrast, int saturation)

  759. {

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

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

  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(desc_dst);

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

  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 (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 AVPixelFormat *format)

  805. {

  806.     switch (*format) {

  807.     case AV_PIX_FMT_YUVJ420P:

  808.         *format = AV_PIX_FMT_YUV420P;

  809.         return 1;

  810.     case AV_PIX_FMT_YUVJ422P:

  811.         *format = AV_PIX_FMT_YUV422P;

  812.         return 1;

  813.     case AV_PIX_FMT_YUVJ444P:

  814.         *format = AV_PIX_FMT_YUV444P;

  815.         return 1;

  816.     case AV_PIX_FMT_YUVJ440P:

  817.         *format = AV_PIX_FMT_YUV440P;

  818.         return 1;

  819.     default:

  820.         return 0;

  821.     }

  822. }

  823. 

  824. SwsContext *sws_alloc_context(void)

  825. {

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

  827. 

  828.     c->av_class = &sws_context_class;

  829.     av_opt_set_defaults(c);

  830. 

  831.     return c;

  832. }

  833. 

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

  835.                              SwsFilter *dstFilter)

  836. {

  837.     int i;

  838.     int usesVFilter, usesHFilter;

  839.     int unscaled;

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

  841.     int srcW              = c->srcW;

  842.     int srcH              = c->srcH;

  843.     int dstW              = c->dstW;

  844.     int dstH              = c->dstH;

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

  846.     int dst_stride_px     = dst_stride >> 1;

  847.     int flags, cpu_flags;

  848.     enum AVPixelFormat srcFormat = c->srcFormat;

  849.     enum AVPixelFormat dstFormat = c->dstFormat;

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

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

  852. 

  853.     cpu_flags = av_get_cpu_flags();

  854.     flags     = c->flags;

  855.     emms_c();

  856.     if (!rgb15to16)

  857.         sws_rgb2rgb_init();

  858. 

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

  860. 

  861.     if (!sws_isSupportedInput(srcFormat)) {

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

  863.                sws_format_name(srcFormat));

  864.         return AVERROR(EINVAL);

  865.     }

  866.     if (!sws_isSupportedOutput(dstFormat)) {

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

  868.                sws_format_name(dstFormat));

  869.         return AVERROR(EINVAL);

  870.     }

  871. 

  872.     i = flags & (SWS_POINT         |

  873.                  SWS_AREA          |

  874.                  SWS_BILINEAR      |

  875.                  SWS_FAST_BILINEAR |

  876.                  SWS_BICUBIC       |

  877.                  SWS_X             |

  878.                  SWS_GAUSS         |

  879.                  SWS_LANCZOS       |

  880.                  SWS_SINC          |

  881.                  SWS_SPLINE        |

  882.                  SWS_BICUBLIN);

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

  884.         av_log(c, AV_LOG_ERROR,

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

  886.         return AVERROR(EINVAL);

  887.     }

  888.     /* sanity check */

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

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

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

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

  893.                srcW, srcH, dstW, dstH);

  894.         return AVERROR(EINVAL);

  895.     }

  896. 

  897.     if (!dstFilter)

  898.         dstFilter = &dummyFilter;

  899.     if (!srcFilter)

  900.         srcFilter = &dummyFilter;

  901. 

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

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

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

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

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

  907. 

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

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

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

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

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

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

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

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

  916. 

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

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

  919. 

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

  921.      * chroma interpolation */

  922.     if (flags & SWS_FULL_CHR_H_INT &&

  923.         isAnyRGB(dstFormat)        &&

  924.         dstFormat != AV_PIX_FMT_RGBA  &&

  925.         dstFormat != AV_PIX_FMT_ARGB  &&

  926.         dstFormat != AV_PIX_FMT_BGRA  &&

  927.         dstFormat != AV_PIX_FMT_ABGR  &&

  928.         dstFormat != AV_PIX_FMT_RGB24 &&

  929.         dstFormat != AV_PIX_FMT_BGR24) {

  930.         av_log(c, AV_LOG_ERROR,

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

  932.                sws_format_name(dstFormat));

  933.         flags   &= ~SWS_FULL_CHR_H_INT;

  934.         c->flags = flags;

  935.     }

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

  937.         c->chrDstHSubSample = 1;

  938. 

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

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

  941.                            SWS_SRC_V_CHR_DROP_SHIFT;

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

  943. 

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

  945.      * wants full chroma */

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

  947.         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&

  948.         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&

  949.         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

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

  951.          (flags & SWS_FAST_BILINEAR)))

  952.         c->chrSrcHSubSample = 1;

  953. 

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

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

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

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

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

  959. 

  960.     /* unscaled special cases */

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

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

  963.         ff_get_unscaled_swscale(c);

  964. 

  965.         if (c->swScale) {

  966.             if (flags & SWS_PRINT_INFO)

  967.                 av_log(c, AV_LOG_INFO,

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

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

  970.             return 0;

  971.         }

  972.     }

  973. 

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

  975.     if (c->srcBpc < 8)

  976.         c->srcBpc = 8;

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

  978.     if (c->dstBpc < 8)

  979.         c->dstBpc = 8;

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

  981.         dst_stride <<= 1;

  982.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

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

  984.                      fail);

  985.     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 10) {

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

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

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

  989.             && (flags & SWS_FAST_BILINEAR)) {

  990.             if (flags & SWS_PRINT_INFO)

  991.                 av_log(c, AV_LOG_INFO,

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

  993.         }

  994.         if (usesHFilter)

  995.             c->canMMX2BeUsed = 0;

  996.     } else

  997.         c->canMMX2BeUsed = 0;

  998. 

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

  1000.     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;

  1001. 

  1002.     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src

  1003.      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do

  1004.      * correct scaling.

  1005.      * n-2 is the last chrominance sample available.

  1006.      * This is not perfect, but no one should notice the difference, the more

  1007.      * correct variant would be like the vertical one, but that would require

  1008.      * some special code for the first and last pixel */

  1009.     if (flags & SWS_FAST_BILINEAR) {

  1010.         if (c->canMMX2BeUsed) {

  1011.             c->lumXInc += 20;

  1012.             c->chrXInc += 20;

  1013.         }

  1014.         // we don't use the x86 asm scaler if MMX is available

  1015.         else if (INLINE_MMX(cpu_flags)) {

  1016.             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;

  1017.             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

  1018.         }

  1019.     }

  1020. 

  1021.     /* precalculate horizontal scaler filter coefficients */

  1022.     {

  1023. #if HAVE_MMXEXT_INLINE

  1024. // can't downscale !!!

  1025.         if (c->canMMX2BeUsed && (flags & SWS_FAST_BILINEAR)) {

  1026.             c->lumMmx2FilterCodeSize = initMMX2HScaler(dstW, c->lumXInc, NULL,

  1027.                                                        NULL, NULL, 8);

  1028.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc,

  1029.                                                        NULL, NULL, NULL, 4);

  1030. 

  1031. #ifdef MAP_ANONYMOUS

  1032.             c->lumMmx2FilterCode = mmap(NULL, c->lumMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1033.             c->chrMmx2FilterCode = mmap(NULL, c->chrMmx2FilterCodeSize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);

  1034. #elif HAVE_VIRTUALALLOC

  1035.             c->lumMmx2FilterCode = VirtualAlloc(NULL, c->lumMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1036.             c->chrMmx2FilterCode = VirtualAlloc(NULL, c->chrMmx2FilterCodeSize, MEM_COMMIT, PAGE_EXECUTE_READWRITE);

  1037. #else

  1038.             c->lumMmx2FilterCode = av_malloc(c->lumMmx2FilterCodeSize);

  1039.             c->chrMmx2FilterCode = av_malloc(c->chrMmx2FilterCodeSize);

  1040. #endif

  1041. 

  1042.             if (!c->lumMmx2FilterCode || !c->chrMmx2FilterCode)

  1043.                 return AVERROR(ENOMEM);

  1044.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);

  1045.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);

  1046.             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);

  1047.             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

  1048. 

  1049.             initMMX2HScaler(dstW, c->lumXInc, c->lumMmx2FilterCode,

  1050.                             c->hLumFilter, c->hLumFilterPos, 8);

  1051.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode,

  1052.                             c->hChrFilter, c->hChrFilterPos, 4);

  1053. 

  1054. #ifdef MAP_ANONYMOUS

  1055.             mprotect(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1056.             mprotect(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize, PROT_EXEC | PROT_READ);

  1057. #endif

  1058.         } else

  1059. #endif /* HAVE_MMXEXT_INLINE */

  1060.         {

  1061.             const int filterAlign =

  1062.                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

  1063.                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1064.                 1;

  1065. 

  1066.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,

  1067.                            &c->hLumFilterSize, c->lumXInc,

  1068.                            srcW, dstW, filterAlign, 1 << 14,

  1069.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1070.                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

  1071.                            c->param, 1) < 0)

  1072.                 goto fail;

  1073.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,

  1074.                            &c->hChrFilterSize, c->chrXInc,

  1075.                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,

  1076.                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1077.                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

  1078.                            c->param, 1) < 0)

  1079.                 goto fail;

  1080.         }

  1081.     } // initialize horizontal stuff

  1082. 

  1083.     /* precalculate vertical scaler filter coefficients */

  1084.     {

  1085.         const int filterAlign =

  1086.             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

  1087.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1088.             1;

  1089. 

  1090.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,

  1091.                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),

  1092.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,

  1093.                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

  1094.                        c->param, 0) < 0)

  1095.             goto fail;

  1096.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,

  1097.                        c->chrYInc, c->chrSrcH, c->chrDstH,

  1098.                        filterAlign, (1 << 12),

  1099.                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,

  1100.                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

  1101.                        c->param, 0) < 0)

  1102.             goto fail;

  1103. 

  1104. #if HAVE_ALTIVEC

  1105.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);

  1106.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

  1107. 

  1108.         for (i = 0; i < c->vLumFilterSize * c->dstH; i++) {

  1109.             int j;

  1110.             short *p = (short *)&c->vYCoeffsBank[i];

  1111.             for (j = 0; j < 8; j++)

  1112.                 p[j] = c->vLumFilter[i];

  1113.         }

  1114. 

  1115.         for (i = 0; i < c->vChrFilterSize * c->chrDstH; i++) {

  1116.             int j;

  1117.             short *p = (short *)&c->vCCoeffsBank[i];

  1118.             for (j = 0; j < 8; j++)

  1119.                 p[j] = c->vChrFilter[i];

  1120.         }

  1121. #endif

  1122.     }

  1123. 

  1124.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1125.     c->vLumBufSize = c->vLumFilterSize;

  1126.     c->vChrBufSize = c->vChrFilterSize;

  1127.     for (i = 0; i < dstH; i++) {

  1128.         int chrI      = (int64_t)i * c->chrDstH / dstH;

  1129.         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,

  1130.                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)

  1131.                                << c->chrSrcVSubSample));

  1132. 

  1133.         nextSlice >>= c->chrSrcVSubSample;

  1134.         nextSlice <<= c->chrSrcVSubSample;

  1135.         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)

  1136.             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];

  1137.         if (c->vChrFilterPos[chrI] + c->vChrBufSize <

  1138.             (nextSlice >> c->chrSrcVSubSample))

  1139.             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -

  1140.                              c->vChrFilterPos[chrI];

  1141.     }

  1142. 

  1143.     /* Allocate pixbufs (we use dynamic allocation because otherwise we would

  1144.      * need to allocate several megabytes to handle all possible cases) */

  1145.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1146.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1147.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

  1148.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1149.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);

  1150.     /* Note we need at least one pixel more at the end because of the MMX code

  1151.      * (just in case someone wants to replace the 4000/8000). */

  1152.     /* align at 16 bytes for AltiVec */

  1153.     for (i = 0; i < c->vLumBufSize; i++) {

  1154.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],

  1155.                           dst_stride + 16, fail);

  1156.         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

  1157.     }

  1158.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1159.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc & ~7);

  1160.     c->uv_off_byte = dst_stride + 16;

  1161.     for (i = 0; i < c->vChrBufSize; i++) {

  1162.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],

  1163.                          dst_stride * 2 + 32, fail);

  1164.         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];

  1165.         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]

  1166.                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1167.     }

  1168.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1169.         for (i = 0; i < c->vLumBufSize; i++) {

  1170.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],

  1171.                               dst_stride + 16, fail);

  1172.             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

  1173.         }

  1174. 

  1175.     // try to avoid drawing green stuff between the right end and the stride end

  1176.     for (i = 0; i < c->vChrBufSize; i++)

  1177.         memset(c->chrUPixBuf[i], 64, dst_stride * 2 + 1);

  1178. 

  1179.     assert(c->chrDstH <= dstH);

  1180. 

  1181.     if (flags & SWS_PRINT_INFO) {

  1182.         if (flags & SWS_FAST_BILINEAR)

  1183.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1184.         else if (flags & SWS_BILINEAR)

  1185.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1186.         else if (flags & SWS_BICUBIC)

  1187.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1188.         else if (flags & SWS_X)

  1189.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1190.         else if (flags & SWS_POINT)

  1191.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1192.         else if (flags & SWS_AREA)

  1193.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1194.         else if (flags & SWS_BICUBLIN)

  1195.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1196.         else if (flags & SWS_GAUSS)

  1197.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1198.         else if (flags & SWS_SINC)

  1199.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1200.         else if (flags & SWS_LANCZOS)

  1201.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1202.         else if (flags & SWS_SPLINE)

  1203.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1204.         else

  1205.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1206. 

  1207.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1208.                sws_format_name(srcFormat),

  1209. #ifdef DITHER1XBPP

  1210.                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||

  1211.                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||

  1212.                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

  1213.                                                              "dithered " : "",

  1214. #else

  1215.                "",

  1216. #endif

  1217.                sws_format_name(dstFormat));

  1218. 

  1219.         if (INLINE_MMXEXT(cpu_flags))

  1220.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1221.         else if (INLINE_AMD3DNOW(cpu_flags))

  1222.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1223.         else if (INLINE_MMX(cpu_flags))

  1224.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1225.         else if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC)

  1226.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1227.         else

  1228.             av_log(c, AV_LOG_INFO, "using C\n");

  1229. 

  1230.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1231.         av_log(c, AV_LOG_DEBUG,

  1232.                "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1233.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1234.         av_log(c, AV_LOG_DEBUG,

  1235.                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1236.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,

  1237.                c->chrXInc, c->chrYInc);

  1238.     }

  1239. 

  1240.     c->swScale = ff_getSwsFunc(c);

  1241.     return 0;

  1242. fail: // FIXME replace things by appropriate error codes

  1243.     return -1;

  1244. }

  1245. 

  1246. #if FF_API_SWS_GETCONTEXT

  1247. SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,

  1248.                            int dstW, int dstH, enum AVPixelFormat dstFormat,

  1249.                            int flags, SwsFilter *srcFilter,

  1250.                            SwsFilter *dstFilter, const double *param)

  1251. {

  1252.     SwsContext *c;

  1253. 

  1254.     if (!(c = sws_alloc_context()))

  1255.         return NULL;

  1256. 

  1257.     c->flags     = flags;

  1258.     c->srcW      = srcW;

  1259.     c->srcH      = srcH;

  1260.     c->dstW      = dstW;

  1261.     c->dstH      = dstH;

  1262.     c->srcRange  = handle_jpeg(&srcFormat);

  1263.     c->dstRange  = handle_jpeg(&dstFormat);

  1264.     c->srcFormat = srcFormat;

  1265.     c->dstFormat = dstFormat;

  1266. 

  1267.     if (param) {

  1268.         c->param[0] = param[0];

  1269.         c->param[1] = param[1];

  1270.     }

  1271.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange,

  1272.                              ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1273.                              c->dstRange, 0, 1 << 16, 1 << 16);

  1274. 

  1275.     if (sws_init_context(c, srcFilter, dstFilter) < 0) {

  1276.         sws_freeContext(c);

  1277.         return NULL;

  1278.     }

  1279. 

  1280.     return c;

  1281. }

  1282. #endif

  1283. 

  1284. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1285.                                 float lumaSharpen, float chromaSharpen,

  1286.                                 float chromaHShift, float chromaVShift,

  1287.                                 int verbose)

  1288. {

  1289.     SwsFilter *filter = av_malloc(sizeof(SwsFilter));

  1290.     if (!filter)

  1291.         return NULL;

  1292. 

  1293.     if (lumaGBlur != 0.0) {

  1294.         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);

  1295.         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

  1296.     } else {

  1297.         filter->lumH = sws_getIdentityVec();

  1298.         filter->lumV = sws_getIdentityVec();

  1299.     }

  1300. 

  1301.     if (chromaGBlur != 0.0) {

  1302.         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);

  1303.         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

  1304.     } else {

  1305.         filter->chrH = sws_getIdentityVec();

  1306.         filter->chrV = sws_getIdentityVec();

  1307.     }

  1308. 

  1309.     if (chromaSharpen != 0.0) {

  1310.         SwsVector *id = sws_getIdentityVec();

  1311.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1312.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1313.         sws_addVec(filter->chrH, id);

  1314.         sws_addVec(filter->chrV, id);

  1315.         sws_freeVec(id);

  1316.     }

  1317. 

  1318.     if (lumaSharpen != 0.0) {

  1319.         SwsVector *id = sws_getIdentityVec();

  1320.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1321.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1322.         sws_addVec(filter->lumH, id);

  1323.         sws_addVec(filter->lumV, id);

  1324.         sws_freeVec(id);

  1325.     }

  1326. 

  1327.     if (chromaHShift != 0.0)

  1328.         sws_shiftVec(filter->chrH, (int)(chromaHShift + 0.5));

  1329. 

  1330.     if (chromaVShift != 0.0)

  1331.         sws_shiftVec(filter->chrV, (int)(chromaVShift + 0.5));

  1332. 

  1333.     sws_normalizeVec(filter->chrH, 1.0);

  1334.     sws_normalizeVec(filter->chrV, 1.0);

  1335.     sws_normalizeVec(filter->lumH, 1.0);

  1336.     sws_normalizeVec(filter->lumV, 1.0);

  1337. 

  1338.     if (verbose)

  1339.         sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1340.     if (verbose)

  1341.         sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1342. 

  1343.     return filter;

  1344. }

  1345. 

  1346. SwsVector *sws_allocVec(int length)

  1347. {

  1348.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1349.     if (!vec)

  1350.         return NULL;

  1351.     vec->length = length;

  1352.     vec->coeff  = av_malloc(sizeof(double) * length);

  1353.     if (!vec->coeff)

  1354.         av_freep(&vec);

  1355.     return vec;

  1356. }

  1357. 

  1358. SwsVector *sws_getGaussianVec(double variance, double quality)

  1359. {

  1360.     const int length = (int)(variance * quality + 0.5) | 1;

  1361.     int i;

  1362.     double middle  = (length - 1) * 0.5;

  1363.     SwsVector *vec = sws_allocVec(length);

  1364. 

  1365.     if (!vec)

  1366.         return NULL;

  1367. 

  1368.     for (i = 0; i < length; i++) {

  1369.         double dist = i - middle;

  1370.         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /

  1371.                         sqrt(2 * variance * M_PI);

  1372.     }

  1373. 

  1374.     sws_normalizeVec(vec, 1.0);

  1375. 

  1376.     return vec;

  1377. }

  1378. 

  1379. SwsVector *sws_getConstVec(double c, int length)

  1380. {

  1381.     int i;

  1382.     SwsVector *vec = sws_allocVec(length);

  1383. 

  1384.     if (!vec)

  1385.         return NULL;

  1386. 

  1387.     for (i = 0; i < length; i++)

  1388.         vec->coeff[i] = c;

  1389. 

  1390.     return vec;

  1391. }

  1392. 

  1393. SwsVector *sws_getIdentityVec(void)

  1394. {

  1395.     return sws_getConstVec(1.0, 1);

  1396. }

  1397. 

  1398. static double sws_dcVec(SwsVector *a)

  1399. {

  1400.     int i;

  1401.     double sum = 0;

  1402. 

  1403.     for (i = 0; i < a->length; i++)

  1404.         sum += a->coeff[i];

  1405. 

  1406.     return sum;

  1407. }

  1408. 

  1409. void sws_scaleVec(SwsVector *a, double scalar)

  1410. {

  1411.     int i;

  1412. 

  1413.     for (i = 0; i < a->length; i++)

  1414.         a->coeff[i] *= scalar;

  1415. }

  1416. 

  1417. void sws_normalizeVec(SwsVector *a, double height)

  1418. {

  1419.     sws_scaleVec(a, height / sws_dcVec(a));

  1420. }

  1421. 

  1422. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1423. {

  1424.     int length = a->length + b->length - 1;

  1425.     int i, j;

  1426.     SwsVector *vec = sws_getConstVec(0.0, length);

  1427. 

  1428.     if (!vec)

  1429.         return NULL;

  1430. 

  1431.     for (i = 0; i < a->length; i++) {

  1432.         for (j = 0; j < b->length; j++) {

  1433.             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

  1434.         }

  1435.     }

  1436. 

  1437.     return vec;

  1438. }

  1439. 

  1440. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1441. {

  1442.     int length = FFMAX(a->length, b->length);

  1443.     int i;

  1444.     SwsVector *vec = sws_getConstVec(0.0, length);

  1445. 

  1446.     if (!vec)

  1447.         return NULL;

  1448. 

  1449.     for (i = 0; i < a->length; i++)

  1450.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1451.     for (i = 0; i < b->length; i++)

  1452.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] += b->coeff[i];

  1453. 

  1454.     return vec;

  1455. }

  1456. 

  1457. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1458. {

  1459.     int length = FFMAX(a->length, b->length);

  1460.     int i;

  1461.     SwsVector *vec = sws_getConstVec(0.0, length);

  1462. 

  1463.     if (!vec)

  1464.         return NULL;

  1465. 

  1466.     for (i = 0; i < a->length; i++)

  1467.         vec->coeff[i + (length - 1) / 2 - (a->length - 1) / 2] += a->coeff[i];

  1468.     for (i = 0; i < b->length; i++)

  1469.         vec->coeff[i + (length - 1) / 2 - (b->length - 1) / 2] -= b->coeff[i];

  1470. 

  1471.     return vec;

  1472. }

  1473. 

  1474. /* shift left / or right if "shift" is negative */

  1475. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1476. {

  1477.     int length = a->length + FFABS(shift) * 2;

  1478.     int i;

  1479.     SwsVector *vec = sws_getConstVec(0.0, length);

  1480. 

  1481.     if (!vec)

  1482.         return NULL;

  1483. 

  1484.     for (i = 0; i < a->length; i++) {

  1485.         vec->coeff[i + (length    - 1) / 2 -

  1486.                        (a->length - 1) / 2 - shift] = a->coeff[i];

  1487.     }

  1488. 

  1489.     return vec;

  1490. }

  1491. 

  1492. void sws_shiftVec(SwsVector *a, int shift)

  1493. {

  1494.     SwsVector *shifted = sws_getShiftedVec(a, shift);

  1495.     av_free(a->coeff);

  1496.     a->coeff  = shifted->coeff;

  1497.     a->length = shifted->length;

  1498.     av_free(shifted);

  1499. }

  1500. 

  1501. void sws_addVec(SwsVector *a, SwsVector *b)

  1502. {

  1503.     SwsVector *sum = sws_sumVec(a, b);

  1504.     av_free(a->coeff);

  1505.     a->coeff  = sum->coeff;

  1506.     a->length = sum->length;

  1507.     av_free(sum);

  1508. }

  1509. 

  1510. void sws_subVec(SwsVector *a, SwsVector *b)

  1511. {

  1512.     SwsVector *diff = sws_diffVec(a, b);

  1513.     av_free(a->coeff);

  1514.     a->coeff  = diff->coeff;

  1515.     a->length = diff->length;

  1516.     av_free(diff);

  1517. }

  1518. 

  1519. void sws_convVec(SwsVector *a, SwsVector *b)

  1520. {

  1521.     SwsVector *conv = sws_getConvVec(a, b);

  1522.     av_free(a->coeff);

  1523.     a->coeff  = conv->coeff;

  1524.     a->length = conv->length;

  1525.     av_free(conv);

  1526. }

  1527. 

  1528. SwsVector *sws_cloneVec(SwsVector *a)

  1529. {

  1530.     int i;

  1531.     SwsVector *vec = sws_allocVec(a->length);

  1532. 

  1533.     if (!vec)

  1534.         return NULL;

  1535. 

  1536.     for (i = 0; i < a->length; i++)

  1537.         vec->coeff[i] = a->coeff[i];

  1538. 

  1539.     return vec;

  1540. }

  1541. 

  1542. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1543. {

  1544.     int i;

  1545.     double max = 0;

  1546.     double min = 0;

  1547.     double range;

  1548. 

  1549.     for (i = 0; i < a->length; i++)

  1550.         if (a->coeff[i] > max)

  1551.             max = a->coeff[i];

  1552. 

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

  1554.         if (a->coeff[i] < min)

  1555.             min = a->coeff[i];

  1556. 

  1557.     range = max - min;

  1558. 

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

  1560.         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

  1561.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1562.         for (; x > 0; x--)

  1563.             av_log(log_ctx, log_level, " ");

  1564.         av_log(log_ctx, log_level, "|\n");

  1565.     }

  1566. }

  1567. 

  1568. void sws_freeVec(SwsVector *a)

  1569. {

  1570.     if (!a)

  1571.         return;

  1572.     av_freep(&a->coeff);

  1573.     a->length = 0;

  1574.     av_free(a);

  1575. }

  1576. 

  1577. void sws_freeFilter(SwsFilter *filter)

  1578. {

  1579.     if (!filter)

  1580.         return;

  1581. 

  1582.     if (filter->lumH)

  1583.         sws_freeVec(filter->lumH);

  1584.     if (filter->lumV)

  1585.         sws_freeVec(filter->lumV);

  1586.     if (filter->chrH)

  1587.         sws_freeVec(filter->chrH);

  1588.     if (filter->chrV)

  1589.         sws_freeVec(filter->chrV);

  1590.     av_free(filter);

  1591. }

  1592. 

  1593. void sws_freeContext(SwsContext *c)

  1594. {

  1595.     int i;

  1596.     if (!c)

  1597.         return;

  1598. 

  1599.     if (c->lumPixBuf) {

  1600.         for (i = 0; i < c->vLumBufSize; i++)

  1601.             av_freep(&c->lumPixBuf[i]);

  1602.         av_freep(&c->lumPixBuf);

  1603.     }

  1604. 

  1605.     if (c->chrUPixBuf) {

  1606.         for (i = 0; i < c->vChrBufSize; i++)

  1607.             av_freep(&c->chrUPixBuf[i]);

  1608.         av_freep(&c->chrUPixBuf);

  1609.         av_freep(&c->chrVPixBuf);

  1610.     }

  1611. 

  1612.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1613.         for (i = 0; i < c->vLumBufSize; i++)

  1614.             av_freep(&c->alpPixBuf[i]);

  1615.         av_freep(&c->alpPixBuf);

  1616.     }

  1617. 

  1618.     av_freep(&c->vLumFilter);

  1619.     av_freep(&c->vChrFilter);

  1620.     av_freep(&c->hLumFilter);

  1621.     av_freep(&c->hChrFilter);

  1622. #if HAVE_ALTIVEC

  1623.     av_freep(&c->vYCoeffsBank);

  1624.     av_freep(&c->vCCoeffsBank);

  1625. #endif

  1626. 

  1627.     av_freep(&c->vLumFilterPos);

  1628.     av_freep(&c->vChrFilterPos);

  1629.     av_freep(&c->hLumFilterPos);

  1630.     av_freep(&c->hChrFilterPos);

  1631. 

  1632. #if HAVE_MMX_INLINE

  1633. #ifdef MAP_ANONYMOUS

  1634.     if (c->lumMmx2FilterCode)

  1635.         munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1636.     if (c->chrMmx2FilterCode)

  1637.         munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1638. #elif HAVE_VIRTUALALLOC

  1639.     if (c->lumMmx2FilterCode)

  1640.         VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1641.     if (c->chrMmx2FilterCode)

  1642.         VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1643. #else

  1644.     av_free(c->lumMmx2FilterCode);

  1645.     av_free(c->chrMmx2FilterCode);

  1646. #endif

  1647.     c->lumMmx2FilterCode = NULL;

  1648.     c->chrMmx2FilterCode = NULL;

  1649. #endif /* HAVE_MMX_INLINE */

  1650. 

  1651.     av_freep(&c->yuvTable);

  1652.     av_free(c->formatConvBuffer);

  1653. 

  1654.     av_free(c);

  1655. }

  1656. 

  1657. struct SwsContext *sws_getCachedContext(struct SwsContext *context, int srcW,

  1658.                                         int srcH, enum AVPixelFormat srcFormat,

  1659.                                         int dstW, int dstH,

  1660.                                         enum AVPixelFormat dstFormat, int flags,

  1661.                                         SwsFilter *srcFilter,

  1662.                                         SwsFilter *dstFilter,

  1663.                                         const double *param)

  1664. {

  1665.     static const double default_param[2] = { SWS_PARAM_DEFAULT,

  1666.                                              SWS_PARAM_DEFAULT };

  1667. 

  1668.     if (!param)

  1669.         param = default_param;

  1670. 

  1671.     if (context &&

  1672.         (context->srcW      != srcW      ||

  1673.          context->srcH      != srcH      ||

  1674.          context->srcFormat != srcFormat ||

  1675.          context->dstW      != dstW      ||

  1676.          context->dstH      != dstH      ||

  1677.          context->dstFormat != dstFormat ||

  1678.          context->flags     != flags     ||

  1679.          context->param[0]  != param[0]  ||

  1680.          context->param[1]  != param[1])) {

  1681.         sws_freeContext(context);

  1682.         context = NULL;

  1683.     }

  1684. 

  1685.     if (!context) {

  1686.         if (!(context = sws_alloc_context()))

  1687.             return NULL;

  1688.         context->srcW      = srcW;

  1689.         context->srcH      = srcH;

  1690.         context->srcRange  = handle_jpeg(&srcFormat);

  1691.         context->srcFormat = srcFormat;

  1692.         context->dstW      = dstW;

  1693.         context->dstH      = dstH;

  1694.         context->dstRange  = handle_jpeg(&dstFormat);

  1695.         context->dstFormat = dstFormat;

  1696.         context->flags     = flags;

  1697.         context->param[0]  = param[0];

  1698.         context->param[1]  = param[1];

  1699.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT],

  1700.                                  context->srcRange,

  1701.                                  ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/,

  1702.                                  context->dstRange, 0, 1 << 16, 1 << 16);

  1703.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1704.             sws_freeContext(context);

  1705.             return NULL;

  1706.         }

  1707.     }

  1708.     return context;

  1709. }