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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. #define _SVID_SOURCE //needed for MAP_ANONYMOUS

  22. #define _DARWIN_C_SOURCE // needed for MAP_ANON

  23. #include <inttypes.h>

  24. #include <string.h>

  25. #include <math.h>

  26. #include <stdio.h>

  27. #include "config.h"

  28. #include <assert.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. #include "swscale.h"

  40. #include "swscale_internal.h"

  41. #include "rgb2rgb.h"

  42. #include "libavutil/intreadwrite.h"

  43. #include "libavutil/x86_cpu.h"

  44. #include "libavutil/cpu.h"

  45. #include "libavutil/avutil.h"

  46. #include "libavutil/bswap.h"

  47. #include "libavutil/mathematics.h"

  48. #include "libavutil/opt.h"

  49. #include "libavutil/pixdesc.h"

  50. #include "libavutil/avassert.h"

  51. 

  52. unsigned swscale_version(void)

  53. {

  54.     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

  55.     return LIBSWSCALE_VERSION_INT;

  56. }

  57. 

  58. const char *swscale_configuration(void)

  59. {

  60.     return FFMPEG_CONFIGURATION;

  61. }

  62. 

  63. const char *swscale_license(void)

  64. {

  65. #define LICENSE_PREFIX "libswscale license: "

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

  67. }

  68. 

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

  70. 

  71. typedef struct FormatEntry {

  72.     int is_supported_in, is_supported_out;

  73. } FormatEntry;

  74. 

  75. static const FormatEntry format_entries[PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  116.     [PIX_FMT_RGBA64BE]    = { 0 , 0 },

  117.     [PIX_FMT_RGBA64LE]    = { 0 , 0 },

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  153.     [PIX_FMT_GBR24P]      = { 1 , 0 },

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

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

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

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

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

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

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

  161. };

  162. 

  163. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  164. {

  165.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  166.         format_entries[pix_fmt].is_supported_in : 0;

  167. }

  168. 

  169. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  170. {

  171.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  172.         format_entries[pix_fmt].is_supported_out : 0;

  173. }

  174. 

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

  176. 

  177. #if FF_API_SWS_FORMAT_NAME

  178. const char *sws_format_name(enum PixelFormat format)

  179. {

  180.     return av_get_pix_fmt_name(format);

  181. }

  182. #endif

  183. 

  184. static double getSplineCoeff(double a, double b, double c, double d, double dist)

  185. {

  186.     if (dist<=1.0) return ((d*dist + c)*dist + b)*dist +a;

  187.     else           return getSplineCoeff(        0.0,

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

  189.                                                  c + 3.0*d,

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

  191.                                          dist-1.0);

  192. }

  193. 

  194. static int initFilter(int16_t **outFilter, int16_t **filterPos, int *outFilterSize, int xInc,

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

  196.                       SwsVector *srcFilter, SwsVector *dstFilter, double param[2])

  197. {

  198.     int i;

  199.     int filterSize;

  200.     int filter2Size;

  201.     int minFilterSize;

  202.     int64_t *filter=NULL;

  203.     int64_t *filter2=NULL;

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

  205.     int ret= -1;

  206. 

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

  208. 

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

  210.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW+3)*sizeof(int16_t), fail);

  211. 

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

  213.         int i;

  214.         filterSize= 1;

  215.         FF_ALLOCZ_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  216. 

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

  218.             filter[i*filterSize]= fone;

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

  220.         }

  221. 

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

  223.         int i;

  224.         int64_t xDstInSrc;

  225.         filterSize= 1;

  226.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  227. 

  228.         xDstInSrc= xInc/2 - 0x8000;

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

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

  231. 

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

  233.             filter[i]= fone;

  234.             xDstInSrc+= xInc;

  235.         }

  236.     } else if ((xInc <= (1<<16) && (flags&SWS_AREA)) || (flags&SWS_FAST_BILINEAR)) { // bilinear upscale

  237.         int i;

  238.         int64_t xDstInSrc;

  239.         filterSize= 2;

  240.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  241. 

  242.         xDstInSrc= xInc/2 - 0x8000;

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

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

  245.             int j;

  246. 

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

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

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

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

  251.                 if (coeff<0) coeff=0;

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

  253.                 xx++;

  254.             }

  255.             xDstInSrc+= xInc;

  256.         }

  257.     } else {

  258.         int64_t xDstInSrc;

  259.         int sizeFactor;

  260. 

  261.         if      (flags&SWS_BICUBIC)      sizeFactor=  4;

  262.         else if (flags&SWS_X)            sizeFactor=  8;

  263.         else if (flags&SWS_AREA)         sizeFactor=  1; //downscale only, for upscale it is bilinear

  264.         else if (flags&SWS_GAUSS)        sizeFactor=  8;   // infinite ;)

  265.         else if (flags&SWS_LANCZOS)      sizeFactor= param[0] != SWS_PARAM_DEFAULT ? ceil(2*param[0]) : 6;

  266.         else if (flags&SWS_SINC)         sizeFactor= 20; // infinite ;)

  267.         else if (flags&SWS_SPLINE)       sizeFactor= 20;  // infinite ;)

  268.         else if (flags&SWS_BILINEAR)     sizeFactor=  2;

  269.         else {

  270.             sizeFactor= 0; //GCC warning killer

  271.             assert(0);

  272.         }

  273. 

  274.         if (xInc <= 1<<16)      filterSize= 1 + sizeFactor; // upscale

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

  276. 

  277.         if (filterSize > srcW-2) filterSize=srcW-2;

  278. 

  279.         FF_ALLOC_OR_GOTO(NULL, filter, dstW*sizeof(*filter)*filterSize, fail);

  280. 

  281.         xDstInSrc= xInc - 0x10000;

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

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

  284.             int j;

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

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

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

  288.                 double floatd;

  289.                 int64_t coeff;

  290. 

  291.                 if (xInc > 1<<16)

  292.                     d= d*dstW/srcW;

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

  294. 

  295.                 if (flags & SWS_BICUBIC) {

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

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

  298. 

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

  300.                         coeff = 0.0;

  301.                     } else {

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

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

  304. 

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

  306.                             coeff = (12*(1<<24)-9*B-6*C)*ddd + (-18*(1<<24)+12*B+6*C)*dd + (6*(1<<24)-2*B)*(1<<30);

  307.                         else

  308.                             coeff = (-B-6*C)*ddd + (6*B+30*C)*dd + (-12*B-48*C)*d + (8*B+24*C)*(1<<30);

  309.                     }

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

  311.                 }

  312. /*                else if (flags & SWS_X) {

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

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

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

  316.                 }*/

  317.                 else if (flags & SWS_X) {

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

  319.                     double c;

  320. 

  321.                     if (floatd<1.0)

  322.                         c = cos(floatd*M_PI);

  323.                     else

  324.                         c=-1.0;

  325.                     if (c<0.0)      c= -pow(-c, A);

  326.                     else            c=  pow( c, A);

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

  328.                 } else if (flags & SWS_AREA) {

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

  330.                     if      (d2*xInc < -(1LL<<(29+16))) coeff= 1.0 * (1LL<<(30+16));

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

  332.                     else coeff=0.0;

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

  334.                 } else if (flags & SWS_GAUSS) {

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

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

  337.                 } else if (flags & SWS_SINC) {

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

  339.                 } else if (flags & SWS_LANCZOS) {

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

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

  342.                     if (floatd>p) coeff=0;

  343.                 } else if (flags & SWS_BILINEAR) {

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

  345.                     if (coeff<0) coeff=0;

  346.                     coeff *= fone >> 30;

  347.                 } else if (flags & SWS_SPLINE) {

  348.                     double p=-2.196152422706632;

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

  350.                 } else {

  351.                     coeff= 0.0; //GCC warning killer

  352.                     assert(0);

  353.                 }

  354. 

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

  356.                 xx++;

  357.             }

  358.             xDstInSrc+= 2*xInc;

  359.         }

  360.     }

  361. 

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

  363.        av_free(filter);

  364.     */

  365.     assert(filterSize>0);

  366.     filter2Size= filterSize;

  367.     if (srcFilter) filter2Size+= srcFilter->length - 1;

  368.     if (dstFilter) filter2Size+= dstFilter->length - 1;

  369.     assert(filter2Size>0);

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

  371. 

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

  373.         int j, k;

  374. 

  375.         if(srcFilter) {

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

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

  378.                     filter2[i*filter2Size + k + j] += srcFilter->coeff[k]*filter[i*filterSize + j];

  379.             }

  380.         } else {

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

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

  383.         }

  384.         //FIXME dstFilter

  385. 

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

  387.     }

  388.     av_freep(&filter);

  389. 

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

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

  392.     minFilterSize= 0;

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

  394.         int min= filter2Size;

  395.         int j;

  396.         int64_t cutOff=0.0;

  397. 

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

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

  400.             int k;

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

  402. 

  403.             if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;

  404. 

  405.             /* preserve monotonicity because the core can't handle the filter otherwise */

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

  407. 

  408.             // move filter coefficients left

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

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

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

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

  413.         }

  414. 

  415.         cutOff=0;

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

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

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

  419. 

  420.             if (cutOff > SWS_MAX_REDUCE_CUTOFF*fone) break;

  421.             min--;

  422.         }

  423. 

  424.         if (min>minFilterSize) minFilterSize= min;

  425.     }

  426. 

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

  428.         // we can handle the special case 4,

  429.         // so we don't want to go to the full 8

  430.         if (minFilterSize < 5)

  431.             filterAlign = 4;

  432. 

  433.         // We really don't want to waste our time

  434.         // doing useless computation, so fall back on

  435.         // the scalar C code for very small filters.

  436.         // Vectorizing is worth it only if you have a

  437.         // decent-sized vector.

  438.         if (minFilterSize < 3)

  439.             filterAlign = 1;

  440.     }

  441. 

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

  443.         // special case for unscaled vertical filtering

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

  445.             filterAlign= 1;

  446.     }

  447. 

  448.     assert(minFilterSize > 0);

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

  450.     assert(filterSize > 0);

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

  452.     if (filterSize >= MAX_FILTER_SIZE*16/((flags&SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter)

  453.         goto fail;

  454.     *outFilterSize= filterSize;

  455. 

  456.     if (flags&SWS_PRINT_INFO)

  457.         av_log(NULL, AV_LOG_VERBOSE, "SwScaler: reducing / aligning filtersize %d -> %d\n", filter2Size, filterSize);

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

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

  460.         int j;

  461. 

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

  463.             if (j>=filter2Size) filter[i*filterSize + j]= 0;

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

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

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

  467.         }

  468.     }

  469. 

  470.     //FIXME try to align filterPos if possible

  471. 

  472.     //fix borders

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

  474.         int j;

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

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

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

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

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

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

  481.             }

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

  483.         }

  484. 

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

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

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

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

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

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

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

  492.             }

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

  494.         }

  495.     }

  496. 

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

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

  499.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter, *outFilterSize*(dstW+3)*sizeof(int16_t), fail);

  500. 

  501.     /* normalize & store in outFilter */

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

  503.         int j;

  504.         int64_t error=0;

  505.         int64_t sum=0;

  506. 

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

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

  509.         }

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

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

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

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

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

  515.             error= v - intV*sum;

  516.         }

  517.     }

  518. 

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

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

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

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

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

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

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

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

  527.     }

  528. 

  529.     ret=0;

  530. fail:

  531.     av_free(filter);

  532.     av_free(filter2);

  533.     return ret;

  534. }

  535. 

  536. #if HAVE_MMX2

  537. static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *filter, int32_t *filterPos, int numSplits)

  538. {

  539.     uint8_t *fragmentA;

  540.     x86_reg imm8OfPShufW1A;

  541.     x86_reg imm8OfPShufW2A;

  542.     x86_reg fragmentLengthA;

  543.     uint8_t *fragmentB;

  544.     x86_reg imm8OfPShufW1B;

  545.     x86_reg imm8OfPShufW2B;

  546.     x86_reg fragmentLengthB;

  547.     int fragmentPos;

  548. 

  549.     int xpos, i;

  550. 

  551.     // create an optimized horizontal scaling routine

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

  553.      * tuned pshufw instructions. For every four output pixels, if four

  554.      * input pixels are enough for the fast bilinear scaling, then a chunk

  555.      * of fragmentB is used. If five input pixels are needed, then a chunk

  556.      * of fragmentA is used.

  557.      */

  558. 

  559.     //code fragment

  560. 

  561.     __asm__ volatile(

  562.         "jmp                         9f                 \n\t"

  563.     // Begin

  564.         "0:                                             \n\t"

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

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

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

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

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

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

  571.         "1:                                             \n\t"

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

  573.         "2:                                             \n\t"

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

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

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

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

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

  579. 

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

  581. 

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

  583.     // End

  584.         "9:                                             \n\t"

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

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

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

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

  589.         "dec                         %1                 \n\t"

  590.         "dec                         %2                 \n\t"

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

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

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

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

  595. 

  596. 

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

  598.         "=r" (fragmentLengthA)

  599.     );

  600. 

  601.     __asm__ volatile(

  602.         "jmp                         9f                 \n\t"

  603.     // Begin

  604.         "0:                                             \n\t"

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

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

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

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

  609.         "1:                                             \n\t"

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

  611.         "2:                                             \n\t"

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

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

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

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

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

  617. 

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

  619. 

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

  621.     // End

  622.         "9:                                             \n\t"

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

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

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

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

  627.         "dec                         %1                 \n\t"

  628.         "dec                         %2                 \n\t"

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

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

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

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

  633. 

  634. 

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

  636.         "=r" (fragmentLengthB)

  637.     );

  638. 

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

  640.     fragmentPos=0;

  641. 

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

  643.         int xx=xpos>>16;

  644. 

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

  646.             int a=0;

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

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

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

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

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

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

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

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

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

  656.             int shift=0;

  657. 

  658.             if (filterCode) {

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

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

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

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

  663.                 filterPos[i/2]= xx;

  664. 

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

  666. 

  667.                 filterCode[fragmentPos + imm8OfPShufW1]=

  668.                     (a+inc) | ((b+inc)<<2) | ((c+inc)<<4) | ((d+inc)<<6);

  669.                 filterCode[fragmentPos + imm8OfPShufW2]=

  670.                     a | (b<<2) | (c<<4) | (d<<6);

  671. 

  672.                 if (i+4-inc>=dstW) shift=maxShift; //avoid overread

  673.                 else if ((filterPos[i/2]&3) <= maxShift) shift=filterPos[i/2]&3; //Align

  674. 

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

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

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

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

  679.                 }

  680.             }

  681. 

  682.             fragmentPos+= fragmentLength;

  683. 

  684.             if (filterCode)

  685.                 filterCode[fragmentPos]= RET;

  686.         }

  687.         xpos+=xInc;

  688.     }

  689.     if (filterCode)

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

  691. 

  692.     return fragmentPos + 1;

  693. }

  694. #endif /* HAVE_MMX2 */

  695. 

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

  697. {

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

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

  700. }

  701. 

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

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

  704.                              int brightness, int contrast, int saturation)

  705. {

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

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

  708. 

  709.     c->brightness= brightness;

  710.     c->contrast  = contrast;

  711.     c->saturation= saturation;

  712.     c->srcRange  = srcRange;

  713.     c->dstRange  = dstRange;

  714.     if (isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;

  715. 

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

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

  718. 

  719.     ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness, contrast, saturation);

  720.     //FIXME factorize

  721. 

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

  723.         ff_yuv2rgb_init_tables_altivec(c, inv_table, brightness, contrast, saturation);

  724.     return 0;

  725. }

  726. 

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

  728.                              int *srcRange, int **table, int *dstRange,

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

  730. {

  731.     if (!c || isYUV(c->dstFormat) || isGray(c->dstFormat)) return -1;

  732. 

  733.     *inv_table = c->srcColorspaceTable;

  734.     *table     = c->dstColorspaceTable;

  735.     *srcRange  = c->srcRange;

  736.     *dstRange  = c->dstRange;

  737.     *brightness= c->brightness;

  738.     *contrast  = c->contrast;

  739.     *saturation= c->saturation;

  740. 

  741.     return 0;

  742. }

  743. 

  744. static int handle_jpeg(enum PixelFormat *format)

  745. {

  746.     switch (*format) {

  747.     case PIX_FMT_YUVJ420P: *format = PIX_FMT_YUV420P; return 1;

  748.     case PIX_FMT_YUVJ422P: *format = PIX_FMT_YUV422P; return 1;

  749.     case PIX_FMT_YUVJ444P: *format = PIX_FMT_YUV444P; return 1;

  750.     case PIX_FMT_YUVJ440P: *format = PIX_FMT_YUV440P; return 1;

  751.     case PIX_FMT_0BGR    : *format = PIX_FMT_ABGR   ; return 0;

  752.     case PIX_FMT_BGR0    : *format = PIX_FMT_BGRA   ; return 0;

  753.     case PIX_FMT_0RGB    : *format = PIX_FMT_ARGB   ; return 0;

  754.     case PIX_FMT_RGB0    : *format = PIX_FMT_RGBA   ; return 0;

  755.     default:                                          return 0;

  756.     }

  757. }

  758. 

  759. SwsContext *sws_alloc_context(void)

  760. {

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

  762. 

  763.     c->av_class = &sws_context_class;

  764.     av_opt_set_defaults(c);

  765. 

  766.     return c;

  767. }

  768. 

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

  770. {

  771.     int i, j;

  772.     int usesVFilter, usesHFilter;

  773.     int unscaled;

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

  775.     int srcW= c->srcW;

  776.     int srcH= c->srcH;

  777.     int dstW= c->dstW;

  778.     int dstH= c->dstH;

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

  780.     int flags, cpu_flags;

  781.     enum PixelFormat srcFormat= c->srcFormat;

  782.     enum PixelFormat dstFormat= c->dstFormat;

  783. 

  784.     cpu_flags = av_get_cpu_flags();

  785.     flags     = c->flags;

  786.     emms_c();

  787.     if (!rgb15to16) sws_rgb2rgb_init();

  788. 

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

  790. 

  791.     handle_jpeg(&srcFormat);

  792.     handle_jpeg(&dstFormat);

  793. 

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

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

  796.         c->srcFormat= srcFormat;

  797.         c->dstFormat= dstFormat;

  798.     }

  799. 

  800.     if (!sws_isSupportedInput(srcFormat)) {

  801.         av_log(c, AV_LOG_ERROR, "%s is not supported as input pixel format\n", av_get_pix_fmt_name(srcFormat));

  802.         return AVERROR(EINVAL);

  803.     }

  804.     if (!sws_isSupportedOutput(dstFormat)) {

  805.         av_log(c, AV_LOG_ERROR, "%s is not supported as output pixel format\n", av_get_pix_fmt_name(dstFormat));

  806.         return AVERROR(EINVAL);

  807.     }

  808. 

  809.     i= flags & ( SWS_POINT

  810.                 |SWS_AREA

  811.                 |SWS_BILINEAR

  812.                 |SWS_FAST_BILINEAR

  813.                 |SWS_BICUBIC

  814.                 |SWS_X

  815.                 |SWS_GAUSS

  816.                 |SWS_LANCZOS

  817.                 |SWS_SINC

  818.                 |SWS_SPLINE

  819.                 |SWS_BICUBLIN);

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

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

  822.         return AVERROR(EINVAL);

  823.     }

  824.     /* sanity check */

  825.     if (srcW<4 || srcH<1 || dstW<8 || dstH<1) { //FIXME check if these are enough and try to lowwer them after fixing the relevant parts of the code

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

  827.                srcW, srcH, dstW, dstH);

  828.         return AVERROR(EINVAL);

  829.     }

  830. 

  831.     if (!dstFilter) dstFilter= &dummyFilter;

  832.     if (!srcFilter) srcFilter= &dummyFilter;

  833. 

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

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

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

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

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

  839. 

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

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

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

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

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

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

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

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

  848. 

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

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

  851. 

  852.     // reuse chroma for 2 pixels RGB/BGR unless user wants full chroma interpolation

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

  854.         if (dstW&1) {

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

  856.             flags |= SWS_FULL_CHR_H_INT;

  857.             c->flags = flags;

  858.         } else

  859.             c->chrDstHSubSample = 1;

  860.     }

  861. 

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

  863.     c->vChrDrop= (flags&SWS_SRC_V_CHR_DROP_MASK)>>SWS_SRC_V_CHR_DROP_SHIFT;

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

  865. 

  866.     // drop every other pixel for chroma calculation unless user wants full chroma

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

  868.       && srcFormat!=PIX_FMT_RGB8      && srcFormat!=PIX_FMT_BGR8

  869.       && srcFormat!=PIX_FMT_RGB4      && srcFormat!=PIX_FMT_BGR4

  870.       && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE

  871.       && ((dstW>>c->chrDstHSubSample) <= (srcW>>1) || (flags&SWS_FAST_BILINEAR)))

  872.         c->chrSrcHSubSample=1;

  873. 

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

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

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

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

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

  879. 

  880.     /* unscaled special cases */

  881.     if (unscaled && !usesHFilter && !usesVFilter && (c->srcRange == c->dstRange || isAnyRGB(dstFormat))) {

  882.         ff_get_unscaled_swscale(c);

  883. 

  884.         if (c->swScale) {

  885.             if (flags&SWS_PRINT_INFO)

  886.                 av_log(c, AV_LOG_INFO, "using unscaled %s -> %s special converter\n",

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

  888.             return 0;

  889.         }

  890.     }

  891. 

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

  893.     if (c->srcBpc < 8)

  894.         c->srcBpc = 8;

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

  896.     if (c->dstBpc < 8)

  897.         c->dstBpc = 8;

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

  899.         c->srcBpc = 16;

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

  901.         dst_stride <<= 1;

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

  903.     if (HAVE_MMX2 && cpu_flags & AV_CPU_FLAG_MMX2 && c->srcBpc == 8 && c->dstBpc <= 10) {

  904.         c->canMMX2BeUsed= (dstW >=srcW && (dstW&31)==0 && (srcW&15)==0) ? 1 : 0;

  905.         if (!c->canMMX2BeUsed && dstW >=srcW && (srcW&15)==0 && (flags&SWS_FAST_BILINEAR)) {

  906.             if (flags&SWS_PRINT_INFO)

  907.                 av_log(c, AV_LOG_INFO, "output width is not a multiple of 32 -> no MMX2 scaler\n");

  908.         }

  909.         if (usesHFilter || isNBPS(c->srcFormat) || is16BPS(c->srcFormat) || isAnyRGB(c->srcFormat)) c->canMMX2BeUsed=0;

  910.     }

  911.     else

  912.         c->canMMX2BeUsed=0;

  913. 

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

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

  916. 

  917.     // match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src to pixel n-2 of dst

  918.     // but only for the FAST_BILINEAR mode otherwise do correct scaling

  919.     // n-2 is the last chrominance sample available

  920.     // this is not perfect, but no one should notice the difference, the more correct variant

  921.     // would be like the vertical one, but that would require some special code for the

  922.     // first and last pixel

  923.     if (flags&SWS_FAST_BILINEAR) {

  924.         if (c->canMMX2BeUsed) {

  925.             c->lumXInc+= 20;

  926.             c->chrXInc+= 20;

  927.         }

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

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

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

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

  932.         }

  933.     }

  934. 

  935.     /* precalculate horizontal scaler filter coefficients */

  936.     {

  937. #if HAVE_MMX2

  938. // can't downscale !!!

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

  940.             c->lumMmx2FilterCodeSize = initMMX2HScaler(      dstW, c->lumXInc, NULL, NULL, NULL, 8);

  941.             c->chrMmx2FilterCodeSize = initMMX2HScaler(c->chrDstW, c->chrXInc, NULL, NULL, NULL, 4);

  942. 

  943. #ifdef MAP_ANONYMOUS

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

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

  946. #elif HAVE_VIRTUALALLOC

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

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

  949. #else

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

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

  952. #endif

  953. 

  954. #ifdef MAP_ANONYMOUS

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

  956. #else

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

  958. #endif

  959.             {

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

  961.                 return AVERROR(ENOMEM);

  962.             }

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

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

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

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

  967. 

  968.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode, c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

  969.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->hChrFilter, (uint32_t*)c->hChrFilterPos, 4);

  970. 

  971. #ifdef MAP_ANONYMOUS

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

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

  974. #endif

  975.         } else

  976. #endif /* HAVE_MMX2 */

  977.         {

  978.             const int filterAlign=

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

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

  981.                 1;

  982. 

  983.             if (initFilter(&c->hLumFilter, &c->hLumFilterPos, &c->hLumFilterSize, c->lumXInc,

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

  985.                            (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC)  : flags, cpu_flags,

  986.                            srcFilter->lumH, dstFilter->lumH, c->param) < 0)

  987.                 goto fail;

  988.             if (initFilter(&c->hChrFilter, &c->hChrFilterPos, &c->hChrFilterSize, c->chrXInc,

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

  990.                            (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags, cpu_flags,

  991.                            srcFilter->chrH, dstFilter->chrH, c->param) < 0)

  992.                 goto fail;

  993.         }

  994.     } // initialize horizontal stuff

  995. 

  996.     /* precalculate vertical scaler filter coefficients */

  997.     {

  998.         const int filterAlign=

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

  1000.             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

  1001.             1;

  1002. 

  1003.         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize, c->lumYInc,

  1004.                        srcH      ,        dstH, filterAlign, (1<<12),

  1005.                        (flags&SWS_BICUBLIN) ? (flags|SWS_BICUBIC)  : flags, cpu_flags,

  1006.                        srcFilter->lumV, dstFilter->lumV, c->param) < 0)

  1007.             goto fail;

  1008.         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize, c->chrYInc,

  1009.                        c->chrSrcH, c->chrDstH, filterAlign, (1<<12),

  1010.                        (flags&SWS_BICUBLIN) ? (flags|SWS_BILINEAR) : flags, cpu_flags,

  1011.                        srcFilter->chrV, dstFilter->chrV, c->param) < 0)

  1012.             goto fail;

  1013. 

  1014. #if HAVE_ALTIVEC

  1015.         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof (vector signed short)*c->vLumFilterSize*c->dstH, fail);

  1016.         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof (vector signed short)*c->vChrFilterSize*c->chrDstH, fail);

  1017. 

  1018.         for (i=0;i<c->vLumFilterSize*c->dstH;i++) {

  1019.             int j;

  1020.             short *p = (short *)&c->vYCoeffsBank[i];

  1021.             for (j=0;j<8;j++)

  1022.                 p[j] = c->vLumFilter[i];

  1023.         }

  1024. 

  1025.         for (i=0;i<c->vChrFilterSize*c->chrDstH;i++) {

  1026.             int j;

  1027.             short *p = (short *)&c->vCCoeffsBank[i];

  1028.             for (j=0;j<8;j++)

  1029.                 p[j] = c->vChrFilter[i];

  1030.         }

  1031. #endif

  1032.     }

  1033. 

  1034.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1035.     c->vLumBufSize= c->vLumFilterSize;

  1036.     c->vChrBufSize= c->vChrFilterSize;

  1037.     for (i=0; i<dstH; i++) {

  1038.         int chrI= (int64_t)i*c->chrDstH / dstH;

  1039.         int nextSlice= FFMAX(c->vLumFilterPos[i   ] + c->vLumFilterSize - 1,

  1040.                            ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample));

  1041. 

  1042.         nextSlice>>= c->chrSrcVSubSample;

  1043.         nextSlice<<= c->chrSrcVSubSample;

  1044.         if (c->vLumFilterPos[i   ] + c->vLumBufSize < nextSlice)

  1045.             c->vLumBufSize= nextSlice - c->vLumFilterPos[i];

  1046.         if (c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>c->chrSrcVSubSample))

  1047.             c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI];

  1048.     }

  1049. 

  1050.     // allocate pixbufs (we use dynamic allocation because otherwise we would need to

  1051.     // allocate several megabytes to handle all possible cases)

  1052.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1053.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail);

  1054.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail);

  1055.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1056.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1057.     //Note we need at least one pixel more at the end because of the MMX code (just in case someone wanna replace the 4000/8000)

  1058.     /* align at 16 bytes for AltiVec */

  1059.     for (i=0; i<c->vLumBufSize; i++) {

  1060.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], dst_stride+16, fail);

  1061.         c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize];

  1062.     }

  1063.     // 64 / c->scalingBpp is the same as 16 / sizeof(scaling_intermediate)

  1064.     c->uv_off   = (dst_stride>>1) + 64 / (c->dstBpc &~ 7);

  1065.     c->uv_offx2 = dst_stride + 16;

  1066.     for (i=0; i<c->vChrBufSize; i++) {

  1067.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i+c->vChrBufSize], dst_stride*2+32, fail);

  1068.         c->chrUPixBuf[i] = c->chrUPixBuf[i+c->vChrBufSize];

  1069.         c->chrVPixBuf[i] = c->chrVPixBuf[i+c->vChrBufSize] = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1070.     }

  1071.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1072.         for (i=0; i<c->vLumBufSize; i++) {

  1073.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], dst_stride+16, fail);

  1074.             c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize];

  1075.         }

  1076. 

  1077.     //try to avoid drawing green stuff between the right end and the stride end

  1078.     for (i=0; i<c->vChrBufSize; i++)

  1079.         if(av_pix_fmt_descriptors[c->dstFormat].comp[0].depth_minus1 == 15){

  1080.             av_assert0(c->dstBpc > 10);

  1081.             for(j=0; j<dst_stride/2+1; j++)

  1082.                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;

  1083.         } else

  1084.             for(j=0; j<dst_stride+1; j++)

  1085.                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

  1086. 

  1087.     assert(c->chrDstH <= dstH);

  1088. 

  1089.     if (flags&SWS_PRINT_INFO) {

  1090.         if      (flags&SWS_FAST_BILINEAR) av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1091.         else if (flags&SWS_BILINEAR)      av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1092.         else if (flags&SWS_BICUBIC)       av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1093.         else if (flags&SWS_X)             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1094.         else if (flags&SWS_POINT)         av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1095.         else if (flags&SWS_AREA)          av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1096.         else if (flags&SWS_BICUBLIN)      av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1097.         else if (flags&SWS_GAUSS)         av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1098.         else if (flags&SWS_SINC)          av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1099.         else if (flags&SWS_LANCZOS)       av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1100.         else if (flags&SWS_SPLINE)        av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1101.         else                              av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1102. 

  1103.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1104.                av_get_pix_fmt_name(srcFormat),

  1105. #ifdef DITHER1XBPP

  1106.                dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 ||

  1107.                dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1108.                dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ? "dithered " : "",

  1109. #else

  1110.                "",

  1111. #endif

  1112.                av_get_pix_fmt_name(dstFormat));

  1113. 

  1114.         if      (HAVE_MMX2     && cpu_flags & AV_CPU_FLAG_MMX2)    av_log(c, AV_LOG_INFO, "using MMX2\n");

  1115.         else if (HAVE_AMD3DNOW && cpu_flags & AV_CPU_FLAG_3DNOW)   av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1116.         else if (HAVE_MMX      && cpu_flags & AV_CPU_FLAG_MMX)     av_log(c, AV_LOG_INFO, "using MMX\n");

  1117.         else if (HAVE_ALTIVEC  && cpu_flags & AV_CPU_FLAG_ALTIVEC) av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1118.         else                                   av_log(c, AV_LOG_INFO, "using C\n");

  1119. 

  1120.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1121.         av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1122.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1123.         av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1124.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc);

  1125.     }

  1126. 

  1127.     c->swScale= ff_getSwsFunc(c);

  1128.     return 0;

  1129. fail: //FIXME replace things by appropriate error codes

  1130.     return -1;

  1131. }

  1132. 

  1133. #if FF_API_SWS_GETCONTEXT

  1134. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  1135.                            int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1136.                            SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1137. {

  1138.     SwsContext *c;

  1139. 

  1140.     if(!(c=sws_alloc_context()))

  1141.         return NULL;

  1142. 

  1143.     c->flags= flags;

  1144.     c->srcW= srcW;

  1145.     c->srcH= srcH;

  1146.     c->dstW= dstW;

  1147.     c->dstH= dstH;

  1148.     c->srcRange = handle_jpeg(&srcFormat);

  1149.     c->dstRange = handle_jpeg(&dstFormat);

  1150.     c->srcFormat= srcFormat;

  1151.     c->dstFormat= dstFormat;

  1152. 

  1153.     if (param) {

  1154.         c->param[0] = param[0];

  1155.         c->param[1] = param[1];

  1156.     }

  1157.     sws_setColorspaceDetails(c, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], c->srcRange, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/, c->dstRange, 0, 1<<16, 1<<16);

  1158. 

  1159.     if(sws_init_context(c, srcFilter, dstFilter) < 0){

  1160.         sws_freeContext(c);

  1161.         return NULL;

  1162.     }

  1163. 

  1164.     return c;

  1165. }

  1166. #endif

  1167. 

  1168. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1169.                                 float lumaSharpen, float chromaSharpen,

  1170.                                 float chromaHShift, float chromaVShift,

  1171.                                 int verbose)

  1172. {

  1173.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));

  1174.     if (!filter)

  1175.         return NULL;

  1176. 

  1177.     if (lumaGBlur!=0.0) {

  1178.         filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);

  1179.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);

  1180.     } else {

  1181.         filter->lumH= sws_getIdentityVec();

  1182.         filter->lumV= sws_getIdentityVec();

  1183.     }

  1184. 

  1185.     if (chromaGBlur!=0.0) {

  1186.         filter->chrH= sws_getGaussianVec(chromaGBlur, 3.0);

  1187.         filter->chrV= sws_getGaussianVec(chromaGBlur, 3.0);

  1188.     } else {

  1189.         filter->chrH= sws_getIdentityVec();

  1190.         filter->chrV= sws_getIdentityVec();

  1191.     }

  1192. 

  1193.     if (chromaSharpen!=0.0) {

  1194.         SwsVector *id= sws_getIdentityVec();

  1195.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1196.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1197.         sws_addVec(filter->chrH, id);

  1198.         sws_addVec(filter->chrV, id);

  1199.         sws_freeVec(id);

  1200.     }

  1201. 

  1202.     if (lumaSharpen!=0.0) {

  1203.         SwsVector *id= sws_getIdentityVec();

  1204.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1205.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1206.         sws_addVec(filter->lumH, id);

  1207.         sws_addVec(filter->lumV, id);

  1208.         sws_freeVec(id);

  1209.     }

  1210. 

  1211.     if (chromaHShift != 0.0)

  1212.         sws_shiftVec(filter->chrH, (int)(chromaHShift+0.5));

  1213. 

  1214.     if (chromaVShift != 0.0)

  1215.         sws_shiftVec(filter->chrV, (int)(chromaVShift+0.5));

  1216. 

  1217.     sws_normalizeVec(filter->chrH, 1.0);

  1218.     sws_normalizeVec(filter->chrV, 1.0);

  1219.     sws_normalizeVec(filter->lumH, 1.0);

  1220.     sws_normalizeVec(filter->lumV, 1.0);

  1221. 

  1222.     if (verbose) sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1223.     if (verbose) sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1224. 

  1225.     return filter;

  1226. }

  1227. 

  1228. SwsVector *sws_allocVec(int length)

  1229. {

  1230.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1231.     if (!vec)

  1232.         return NULL;

  1233.     vec->length = length;

  1234.     vec->coeff  = av_malloc(sizeof(double) * length);

  1235.     if (!vec->coeff)

  1236.         av_freep(&vec);

  1237.     return vec;

  1238. }

  1239. 

  1240. SwsVector *sws_getGaussianVec(double variance, double quality)

  1241. {

  1242.     const int length= (int)(variance*quality + 0.5) | 1;

  1243.     int i;

  1244.     double middle= (length-1)*0.5;

  1245.     SwsVector *vec= sws_allocVec(length);

  1246. 

  1247.     if (!vec)

  1248.         return NULL;

  1249. 

  1250.     for (i=0; i<length; i++) {

  1251.         double dist= i-middle;

  1252.         vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*M_PI);

  1253.     }

  1254. 

  1255.     sws_normalizeVec(vec, 1.0);

  1256. 

  1257.     return vec;

  1258. }

  1259. 

  1260. SwsVector *sws_getConstVec(double c, int length)

  1261. {

  1262.     int i;

  1263.     SwsVector *vec= sws_allocVec(length);

  1264. 

  1265.     if (!vec)

  1266.         return NULL;

  1267. 

  1268.     for (i=0; i<length; i++)

  1269.         vec->coeff[i]= c;

  1270. 

  1271.     return vec;

  1272. }

  1273. 

  1274. SwsVector *sws_getIdentityVec(void)

  1275. {

  1276.     return sws_getConstVec(1.0, 1);

  1277. }

  1278. 

  1279. static double sws_dcVec(SwsVector *a)

  1280. {

  1281.     int i;

  1282.     double sum=0;

  1283. 

  1284.     for (i=0; i<a->length; i++)

  1285.         sum+= a->coeff[i];

  1286. 

  1287.     return sum;

  1288. }

  1289. 

  1290. void sws_scaleVec(SwsVector *a, double scalar)

  1291. {

  1292.     int i;

  1293. 

  1294.     for (i=0; i<a->length; i++)

  1295.         a->coeff[i]*= scalar;

  1296. }

  1297. 

  1298. void sws_normalizeVec(SwsVector *a, double height)

  1299. {

  1300.     sws_scaleVec(a, height/sws_dcVec(a));

  1301. }

  1302. 

  1303. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1304. {

  1305.     int length= a->length + b->length - 1;

  1306.     int i, j;

  1307.     SwsVector *vec= sws_getConstVec(0.0, length);

  1308. 

  1309.     if (!vec)

  1310.         return NULL;

  1311. 

  1312.     for (i=0; i<a->length; i++) {

  1313.         for (j=0; j<b->length; j++) {

  1314.             vec->coeff[i+j]+= a->coeff[i]*b->coeff[j];

  1315.         }

  1316.     }

  1317. 

  1318.     return vec;

  1319. }

  1320. 

  1321. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1322. {

  1323.     int length= FFMAX(a->length, b->length);

  1324.     int i;

  1325.     SwsVector *vec= sws_getConstVec(0.0, length);

  1326. 

  1327.     if (!vec)

  1328.         return NULL;

  1329. 

  1330.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1331.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]+= b->coeff[i];

  1332. 

  1333.     return vec;

  1334. }

  1335. 

  1336. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1337. {

  1338.     int length= FFMAX(a->length, b->length);

  1339.     int i;

  1340.     SwsVector *vec= sws_getConstVec(0.0, length);

  1341. 

  1342.     if (!vec)

  1343.         return NULL;

  1344. 

  1345.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1346.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]-= b->coeff[i];

  1347. 

  1348.     return vec;

  1349. }

  1350. 

  1351. /* shift left / or right if "shift" is negative */

  1352. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1353. {

  1354.     int length= a->length + FFABS(shift)*2;

  1355.     int i;

  1356.     SwsVector *vec= sws_getConstVec(0.0, length);

  1357. 

  1358.     if (!vec)

  1359.         return NULL;

  1360. 

  1361.     for (i=0; i<a->length; i++) {

  1362.         vec->coeff[i + (length-1)/2 - (a->length-1)/2 - shift]= a->coeff[i];

  1363.     }

  1364. 

  1365.     return vec;

  1366. }

  1367. 

  1368. void sws_shiftVec(SwsVector *a, int shift)

  1369. {

  1370.     SwsVector *shifted= sws_getShiftedVec(a, shift);

  1371.     av_free(a->coeff);

  1372.     a->coeff= shifted->coeff;

  1373.     a->length= shifted->length;

  1374.     av_free(shifted);

  1375. }

  1376. 

  1377. void sws_addVec(SwsVector *a, SwsVector *b)

  1378. {

  1379.     SwsVector *sum= sws_sumVec(a, b);

  1380.     av_free(a->coeff);

  1381.     a->coeff= sum->coeff;

  1382.     a->length= sum->length;

  1383.     av_free(sum);

  1384. }

  1385. 

  1386. void sws_subVec(SwsVector *a, SwsVector *b)

  1387. {

  1388.     SwsVector *diff= sws_diffVec(a, b);

  1389.     av_free(a->coeff);

  1390.     a->coeff= diff->coeff;

  1391.     a->length= diff->length;

  1392.     av_free(diff);

  1393. }

  1394. 

  1395. void sws_convVec(SwsVector *a, SwsVector *b)

  1396. {

  1397.     SwsVector *conv= sws_getConvVec(a, b);

  1398.     av_free(a->coeff);

  1399.     a->coeff= conv->coeff;

  1400.     a->length= conv->length;

  1401.     av_free(conv);

  1402. }

  1403. 

  1404. SwsVector *sws_cloneVec(SwsVector *a)

  1405. {

  1406.     int i;

  1407.     SwsVector *vec= sws_allocVec(a->length);

  1408. 

  1409.     if (!vec)

  1410.         return NULL;

  1411. 

  1412.     for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];

  1413. 

  1414.     return vec;

  1415. }

  1416. 

  1417. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1418. {

  1419.     int i;

  1420.     double max=0;

  1421.     double min=0;

  1422.     double range;

  1423. 

  1424.     for (i=0; i<a->length; i++)

  1425.         if (a->coeff[i]>max) max= a->coeff[i];

  1426. 

  1427.     for (i=0; i<a->length; i++)

  1428.         if (a->coeff[i]<min) min= a->coeff[i];

  1429. 

  1430.     range= max - min;

  1431. 

  1432.     for (i=0; i<a->length; i++) {

  1433.         int x= (int)((a->coeff[i]-min)*60.0/range +0.5);

  1434.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1435.         for (;x>0; x--) av_log(log_ctx, log_level, " ");

  1436.         av_log(log_ctx, log_level, "|\n");

  1437.     }

  1438. }

  1439. 

  1440. void sws_freeVec(SwsVector *a)

  1441. {

  1442.     if (!a) return;

  1443.     av_freep(&a->coeff);

  1444.     a->length=0;

  1445.     av_free(a);

  1446. }

  1447. 

  1448. void sws_freeFilter(SwsFilter *filter)

  1449. {

  1450.     if (!filter) return;

  1451. 

  1452.     if (filter->lumH) sws_freeVec(filter->lumH);

  1453.     if (filter->lumV) sws_freeVec(filter->lumV);

  1454.     if (filter->chrH) sws_freeVec(filter->chrH);

  1455.     if (filter->chrV) sws_freeVec(filter->chrV);

  1456.     av_free(filter);

  1457. }

  1458. 

  1459. void sws_freeContext(SwsContext *c)

  1460. {

  1461.     int i;

  1462.     if (!c) return;

  1463. 

  1464.     if (c->lumPixBuf) {

  1465.         for (i=0; i<c->vLumBufSize; i++)

  1466.             av_freep(&c->lumPixBuf[i]);

  1467.         av_freep(&c->lumPixBuf);

  1468.     }

  1469. 

  1470.     if (c->chrUPixBuf) {

  1471.         for (i=0; i<c->vChrBufSize; i++)

  1472.             av_freep(&c->chrUPixBuf[i]);

  1473.         av_freep(&c->chrUPixBuf);

  1474.         av_freep(&c->chrVPixBuf);

  1475.     }

  1476. 

  1477.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1478.         for (i=0; i<c->vLumBufSize; i++)

  1479.             av_freep(&c->alpPixBuf[i]);

  1480.         av_freep(&c->alpPixBuf);

  1481.     }

  1482. 

  1483.     av_freep(&c->vLumFilter);

  1484.     av_freep(&c->vChrFilter);

  1485.     av_freep(&c->hLumFilter);

  1486.     av_freep(&c->hChrFilter);

  1487. #if HAVE_ALTIVEC

  1488.     av_freep(&c->vYCoeffsBank);

  1489.     av_freep(&c->vCCoeffsBank);

  1490. #endif

  1491. 

  1492.     av_freep(&c->vLumFilterPos);

  1493.     av_freep(&c->vChrFilterPos);

  1494.     av_freep(&c->hLumFilterPos);

  1495.     av_freep(&c->hChrFilterPos);

  1496. 

  1497. #if HAVE_MMX

  1498. #ifdef MAP_ANONYMOUS

  1499.     if (c->lumMmx2FilterCode) munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1500.     if (c->chrMmx2FilterCode) munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1501. #elif HAVE_VIRTUALALLOC

  1502.     if (c->lumMmx2FilterCode) VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1503.     if (c->chrMmx2FilterCode) VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1504. #else

  1505.     av_free(c->lumMmx2FilterCode);

  1506.     av_free(c->chrMmx2FilterCode);

  1507. #endif

  1508.     c->lumMmx2FilterCode=NULL;

  1509.     c->chrMmx2FilterCode=NULL;

  1510. #endif /* HAVE_MMX */

  1511. 

  1512.     av_freep(&c->yuvTable);

  1513.     av_freep(&c->formatConvBuffer);

  1514. 

  1515.     av_free(c);

  1516. }

  1517. 

  1518. struct SwsContext *sws_getCachedContext(struct SwsContext *context,

  1519.                                         int srcW, int srcH, enum PixelFormat srcFormat,

  1520.                                         int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1521.                                         SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1522. {

  1523.     static const double default_param[2] = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT};

  1524. 

  1525.     if (!param)

  1526.         param = default_param;

  1527. 

  1528.     if (context &&

  1529.         (context->srcW      != srcW      ||

  1530.          context->srcH      != srcH      ||

  1531.          context->srcFormat != srcFormat ||

  1532.          context->dstW      != dstW      ||

  1533.          context->dstH      != dstH      ||

  1534.          context->dstFormat != dstFormat ||

  1535.          context->flags     != flags     ||

  1536.          context->param[0]  != param[0]  ||

  1537.          context->param[1]  != param[1])) {

  1538.         sws_freeContext(context);

  1539.         context = NULL;

  1540.     }

  1541. 

  1542.     if (!context) {

  1543.         if (!(context = sws_alloc_context()))

  1544.             return NULL;

  1545.         context->srcW      = srcW;

  1546.         context->srcH      = srcH;

  1547.         context->srcRange  = handle_jpeg(&srcFormat);

  1548.         context->srcFormat = srcFormat;

  1549.         context->dstW      = dstW;

  1550.         context->dstH      = dstH;

  1551.         context->dstRange  = handle_jpeg(&dstFormat);

  1552.         context->dstFormat = dstFormat;

  1553.         context->flags     = flags;

  1554.         context->param[0]  = param[0];

  1555.         context->param[1]  = param[1];

  1556.         sws_setColorspaceDetails(context, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT], context->srcRange, ff_yuv2rgb_coeffs[SWS_CS_DEFAULT] /* FIXME*/, context->dstRange, 0, 1<<16, 1<<16);

  1557.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1558.             sws_freeContext(context);

  1559.             return NULL;

  1560.         }

  1561.     }

  1562.     return context;

  1563. }