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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. #define _SVID_SOURCE //needed for MAP_ANONYMOUS

  22. #include <inttypes.h>

  23. #include <string.h>

  24. #include <math.h>

  25. #include <stdio.h>

  26. #include "config.h"

  27. #include <assert.h>

  28. #if HAVE_SYS_MMAN_H

  29. #include <sys/mman.h>

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

  31. #define MAP_ANONYMOUS MAP_ANON

  32. #endif

  33. #endif

  34. #if HAVE_VIRTUALALLOC

  35. #define WIN32_LEAN_AND_MEAN

  36. #include <windows.h>

  37. #endif

  38. #include "swscale.h"

  39. #include "swscale_internal.h"

  40. #include "rgb2rgb.h"

  41. #include "libavutil/intreadwrite.h"

  42. #include "libavutil/x86_cpu.h"

  43. #include "libavutil/cpu.h"

  44. #include "libavutil/avutil.h"

  45. #include "libavutil/bswap.h"

  46. #include "libavutil/mathematics.h"

  47. #include "libavutil/opt.h"

  48. #include "libavutil/pixdesc.h"

  49. 

  50. unsigned swscale_version(void)

  51. {

  52.     return LIBSWSCALE_VERSION_INT;

  53. }

  54. 

  55. const char *swscale_configuration(void)

  56. {

  57.     return LIBAV_CONFIGURATION;

  58. }

  59. 

  60. const char *swscale_license(void)

  61. {

  62. #define LICENSE_PREFIX "libswscale license: "

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

  64. }

  65. 

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

  67. 

  68. typedef struct FormatEntry {

  69.     int is_supported_in, is_supported_out;

  70. } FormatEntry;

  71. 

  72. static const FormatEntry format_entries[PIX_FMT_NB] = {

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  149. };

  150. 

  151. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  152. {

  153.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  154.         format_entries[pix_fmt].is_supported_in : 0;

  155. }

  156. 

  157. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  158. {

  159.     return (unsigned)pix_fmt < PIX_FMT_NB ?

  160.         format_entries[pix_fmt].is_supported_out : 0;

  161. }

  162. 

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

  164. 

  165. const char *sws_format_name(enum PixelFormat format)

  166. {

  167.     if ((unsigned)format < PIX_FMT_NB && av_pix_fmt_descriptors[format].name)

  168.         return av_pix_fmt_descriptors[format].name;

  169.     else

  170.         return "Unknown format";

  171. }

  172. 

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

  174. {

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

  176.     else           return getSplineCoeff(        0.0,

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

  178.                                                  c + 3.0*d,

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

  180.                                          dist-1.0);

  181. }

  182. 

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

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

  185.                       SwsVector *srcFilter, SwsVector *dstFilter, double param[2], int is_horizontal)

  186. {

  187.     int i;

  188.     int filterSize;

  189.     int filter2Size;

  190.     int minFilterSize;

  191.     int64_t *filter=NULL;

  192.     int64_t *filter2=NULL;

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

  194.     int ret= -1;

  195. 

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

  197. 

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

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

  200. 

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

  202.         int i;

  203.         filterSize= 1;

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

  205. 

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

  207.             filter[i*filterSize]= fone;

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

  209.         }

  210. 

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

  212.         int i;

  213.         int xDstInSrc;

  214.         filterSize= 1;

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

  216. 

  217.         xDstInSrc= xInc/2 - 0x8000;

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

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

  220. 

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

  222.             filter[i]= fone;

  223.             xDstInSrc+= xInc;

  224.         }

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

  226.         int i;

  227.         int xDstInSrc;

  228.         filterSize= 2;

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

  230. 

  231.         xDstInSrc= xInc/2 - 0x8000;

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

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

  234.             int j;

  235. 

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

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

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

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

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

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

  242.                 xx++;

  243.             }

  244.             xDstInSrc+= xInc;

  245.         }

  246.     } else {

  247.         int xDstInSrc;

  248.         int sizeFactor;

  249. 

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

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

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

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

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

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

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

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

  258.         else {

  259.             sizeFactor= 0; //GCC warning killer

  260.             assert(0);

  261.         }

  262. 

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

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

  265. 

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

  267.         filterSize = FFMAX(filterSize, 1);

  268. 

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

  270. 

  271.         xDstInSrc= xInc - 0x10000;

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

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

  274.             int j;

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

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

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

  278.                 double floatd;

  279.                 int64_t coeff;

  280. 

  281.                 if (xInc > 1<<16)

  282.                     d= d*dstW/srcW;

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

  284. 

  285.                 if (flags & SWS_BICUBIC) {

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

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

  288. 

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

  290.                         coeff = 0.0;

  291.                     } else {

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

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

  294. 

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

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

  297.                         else

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

  299.                     }

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

  301.                 }

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

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

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

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

  306.                 }*/

  307.                 else if (flags & SWS_X) {

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

  309.                     double c;

  310. 

  311.                     if (floatd<1.0)

  312.                         c = cos(floatd*M_PI);

  313.                     else

  314.                         c=-1.0;

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

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

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

  318.                 } else if (flags & SWS_AREA) {

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

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

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

  322.                     else coeff=0.0;

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

  324.                 } else if (flags & SWS_GAUSS) {

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

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

  327.                 } else if (flags & SWS_SINC) {

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

  329.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  333.                 } else if (flags & SWS_BILINEAR) {

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

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

  336.                     coeff *= fone >> 30;

  337.                 } else if (flags & SWS_SPLINE) {

  338.                     double p=-2.196152422706632;

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

  340.                 } else {

  341.                     coeff= 0.0; //GCC warning killer

  342.                     assert(0);

  343.                 }

  344. 

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

  346.                 xx++;

  347.             }

  348.             xDstInSrc+= 2*xInc;

  349.         }

  350.     }

  351. 

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

  353.        av_free(filter);

  354.     */

  355.     assert(filterSize>0);

  356.     filter2Size= filterSize;

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

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

  359.     assert(filter2Size>0);

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

  361. 

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

  363.         int j, k;

  364. 

  365.         if(srcFilter) {

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

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

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

  369.             }

  370.         } else {

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

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

  373.         }

  374.         //FIXME dstFilter

  375. 

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

  377.     }

  378.     av_freep(&filter);

  379. 

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

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

  382.     minFilterSize= 0;

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

  384.         int min= filter2Size;

  385.         int j;

  386.         int64_t cutOff=0.0;

  387. 

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

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

  390.             int k;

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

  392. 

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

  394. 

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

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

  397. 

  398.             // move filter coefficients left

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

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

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

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

  403.         }

  404. 

  405.         cutOff=0;

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

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

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

  409. 

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

  411.             min--;

  412.         }

  413. 

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

  415.     }

  416. 

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

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

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

  420.         if (minFilterSize < 5)

  421.             filterAlign = 4;

  422. 

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

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

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

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

  427.         // decent-sized vector.

  428.         if (minFilterSize < 3)

  429.             filterAlign = 1;

  430.     }

  431. 

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

  433.         // special case for unscaled vertical filtering

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

  435.             filterAlign= 1;

  436.     }

  437. 

  438.     assert(minFilterSize > 0);

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

  440.     assert(filterSize > 0);

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

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

  443.         goto fail;

  444.     *outFilterSize= filterSize;

  445. 

  446.     if (flags&SWS_PRINT_INFO)

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

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

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

  450.         int j;

  451. 

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

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

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

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

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

  457.         }

  458.     }

  459. 

  460.     //FIXME try to align filterPos if possible

  461. 

  462.     //fix borders

  463.     if (is_horizontal) {

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

  465.             int j;

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

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

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

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

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

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

  472.                 }

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

  474.             }

  475. 

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

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

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

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

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

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

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

  483.                 }

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

  485.             }

  486.         }

  487.     }

  488. 

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

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

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

  492. 

  493.     /* normalize & store in outFilter */

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

  495.         int j;

  496.         int64_t error=0;

  497.         int64_t sum=0;

  498. 

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

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

  501.         }

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

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

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

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

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

  507.             error= v - intV*sum;

  508.         }

  509.     }

  510. 

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

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

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

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

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

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

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

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

  519.     }

  520. 

  521.     ret=0;

  522. fail:

  523.     av_free(filter);

  524.     av_free(filter2);

  525.     return ret;

  526. }

  527. 

  528. #if HAVE_MMX2

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

  530. {

  531.     uint8_t *fragmentA;

  532.     x86_reg imm8OfPShufW1A;

  533.     x86_reg imm8OfPShufW2A;

  534.     x86_reg fragmentLengthA;

  535.     uint8_t *fragmentB;

  536.     x86_reg imm8OfPShufW1B;

  537.     x86_reg imm8OfPShufW2B;

  538.     x86_reg fragmentLengthB;

  539.     int fragmentPos;

  540. 

  541.     int xpos, i;

  542. 

  543.     // create an optimized horizontal scaling routine

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

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

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

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

  548.      * of fragmentA is used.

  549.      */

  550. 

  551.     //code fragment

  552. 

  553.     __asm__ volatile(

  554.         "jmp                         9f                 \n\t"

  555.     // Begin

  556.         "0:                                             \n\t"

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

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

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

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

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

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

  563.         "1:                                             \n\t"

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

  565.         "2:                                             \n\t"

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

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

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

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

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

  571. 

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

  573. 

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

  575.     // End

  576.         "9:                                             \n\t"

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

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

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

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

  581.         "dec                         %1                 \n\t"

  582.         "dec                         %2                 \n\t"

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

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

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

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

  587. 

  588. 

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

  590.         "=r" (fragmentLengthA)

  591.     );

  592. 

  593.     __asm__ volatile(

  594.         "jmp                         9f                 \n\t"

  595.     // Begin

  596.         "0:                                             \n\t"

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

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

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

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

  601.         "1:                                             \n\t"

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

  603.         "2:                                             \n\t"

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

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

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

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

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

  609. 

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

  611. 

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

  613.     // End

  614.         "9:                                             \n\t"

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

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

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

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

  619.         "dec                         %1                 \n\t"

  620.         "dec                         %2                 \n\t"

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

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

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

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

  625. 

  626. 

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

  628.         "=r" (fragmentLengthB)

  629.     );

  630. 

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

  632.     fragmentPos=0;

  633. 

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

  635.         int xx=xpos>>16;

  636. 

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

  638.             int a=0;

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

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

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

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

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

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

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

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

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

  648.             int shift=0;

  649. 

  650.             if (filterCode) {

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

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

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

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

  655.                 filterPos[i/2]= xx;

  656. 

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

  658. 

  659.                 filterCode[fragmentPos + imm8OfPShufW1]=

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

  661.                 filterCode[fragmentPos + imm8OfPShufW2]=

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

  663. 

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

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

  666. 

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

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

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

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

  671.                 }

  672.             }

  673. 

  674.             fragmentPos+= fragmentLength;

  675. 

  676.             if (filterCode)

  677.                 filterCode[fragmentPos]= RET;

  678.         }

  679.         xpos+=xInc;

  680.     }

  681.     if (filterCode)

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

  683. 

  684.     return fragmentPos + 1;

  685. }

  686. #endif /* HAVE_MMX2 */

  687. 

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

  689. {

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

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

  692. }

  693. 

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

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

  696.                              int brightness, int contrast, int saturation)

  697. {

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

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

  700. 

  701.     c->brightness= brightness;

  702.     c->contrast  = contrast;

  703.     c->saturation= saturation;

  704.     c->srcRange  = srcRange;

  705.     c->dstRange  = dstRange;

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

  707. 

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

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

  710. 

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

  712.     //FIXME factorize

  713. 

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

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

  716.     return 0;

  717. }

  718. 

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

  720.                              int *srcRange, int **table, int *dstRange,

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

  722. {

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

  724. 

  725.     *inv_table = c->srcColorspaceTable;

  726.     *table     = c->dstColorspaceTable;

  727.     *srcRange  = c->srcRange;

  728.     *dstRange  = c->dstRange;

  729.     *brightness= c->brightness;

  730.     *contrast  = c->contrast;

  731.     *saturation= c->saturation;

  732. 

  733.     return 0;

  734. }

  735. 

  736. static int handle_jpeg(enum PixelFormat *format)

  737. {

  738.     switch (*format) {

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

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

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

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

  743.     default:                                          return 0;

  744.     }

  745. }

  746. 

  747. SwsContext *sws_alloc_context(void)

  748. {

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

  750. 

  751.     c->av_class = &sws_context_class;

  752.     av_opt_set_defaults(c);

  753. 

  754.     return c;

  755. }

  756. 

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

  758. {

  759.     int i;

  760.     int usesVFilter, usesHFilter;

  761.     int unscaled;

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

  763.     int srcW= c->srcW;

  764.     int srcH= c->srcH;

  765.     int dstW= c->dstW;

  766.     int dstH= c->dstH;

  767.     int dst_stride = FFALIGN(dstW * sizeof(int16_t) + 16, 16), dst_stride_px = dst_stride >> 1;

  768.     int flags, cpu_flags;

  769.     enum PixelFormat srcFormat= c->srcFormat;

  770.     enum PixelFormat dstFormat= c->dstFormat;

  771. 

  772.     cpu_flags = av_get_cpu_flags();

  773.     flags     = c->flags;

  774.     emms_c();

  775.     if (!rgb15to16) sws_rgb2rgb_init();

  776. 

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

  778. 

  779.     if (!sws_isSupportedInput(srcFormat)) {

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

  781.         return AVERROR(EINVAL);

  782.     }

  783.     if (!sws_isSupportedOutput(dstFormat)) {

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

  785.         return AVERROR(EINVAL);

  786.     }

  787. 

  788.     i= flags & ( SWS_POINT

  789.                 |SWS_AREA

  790.                 |SWS_BILINEAR

  791.                 |SWS_FAST_BILINEAR

  792.                 |SWS_BICUBIC

  793.                 |SWS_X

  794.                 |SWS_GAUSS

  795.                 |SWS_LANCZOS

  796.                 |SWS_SINC

  797.                 |SWS_SPLINE

  798.                 |SWS_BICUBLIN);

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

  800.         av_log(c, AV_LOG_ERROR, "Exactly one scaler algorithm must be chosen\n");

  801.         return AVERROR(EINVAL);

  802.     }

  803.     /* sanity check */

  804.     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

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

  806.                srcW, srcH, dstW, dstH);

  807.         return AVERROR(EINVAL);

  808.     }

  809. 

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

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

  812. 

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

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

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

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

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

  818. 

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

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

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

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

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

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

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

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

  827. 

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

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

  830. 

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

  832.     if (flags & SWS_FULL_CHR_H_INT &&

  833.         isAnyRGB(dstFormat)       &&

  834.         dstFormat != PIX_FMT_RGBA &&

  835.         dstFormat != PIX_FMT_ARGB &&

  836.         dstFormat != PIX_FMT_BGRA &&

  837.         dstFormat != PIX_FMT_ABGR &&

  838.         dstFormat != PIX_FMT_RGB24 &&

  839.         dstFormat != PIX_FMT_BGR24) {

  840.         av_log(c, AV_LOG_ERROR,

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

  842.                sws_format_name(dstFormat));

  843.         flags &= ~SWS_FULL_CHR_H_INT;

  844.         c->flags = flags;

  845.     }

  846.     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) c->chrDstHSubSample=1;

  847. 

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

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

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

  851. 

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

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

  854.       && srcFormat!=PIX_FMT_RGB8      && srcFormat!=PIX_FMT_BGR8

  855.       && srcFormat!=PIX_FMT_RGB4      && srcFormat!=PIX_FMT_BGR4

  856.       && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE

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

  858.         c->chrSrcHSubSample=1;

  859. 

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

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

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

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

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

  865. 

  866.     /* unscaled special cases */

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

  868.         ff_get_unscaled_swscale(c);

  869. 

  870.         if (c->swScale) {

  871.             if (flags&SWS_PRINT_INFO)

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

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

  874.             return 0;

  875.         }

  876.     }

  877. 

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

  879.     if (c->srcBpc < 8)

  880.         c->srcBpc = 8;

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

  882.     if (c->dstBpc < 8)

  883.         c->dstBpc = 8;

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

  885.         dst_stride <<= 1;

  886.     FF_ALLOC_OR_GOTO(c, c->formatConvBuffer,

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

  888.                      fail);

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

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

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

  892.             if (flags&SWS_PRINT_INFO)

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

  894.         }

  895.         if (usesHFilter) c->canMMX2BeUsed=0;

  896.     }

  897.     else

  898.         c->canMMX2BeUsed=0;

  899. 

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

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

  902. 

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

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

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

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

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

  908.     // first and last pixel

  909.     if (flags&SWS_FAST_BILINEAR) {

  910.         if (c->canMMX2BeUsed) {

  911.             c->lumXInc+= 20;

  912.             c->chrXInc+= 20;

  913.         }

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

  915.         else if (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) {

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

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

  918.         }

  919.     }

  920. 

  921.     /* precalculate horizontal scaler filter coefficients */

  922.     {

  923. #if HAVE_MMX2

  924. // can't downscale !!!

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

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

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

  928. 

  929. #ifdef MAP_ANONYMOUS

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

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

  932. #elif HAVE_VIRTUALALLOC

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

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

  935. #else

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

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

  938. #endif

  939. 

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

  941.                 return AVERROR(ENOMEM);

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

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

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

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

  946. 

  947.             initMMX2HScaler(      dstW, c->lumXInc, c->lumMmx2FilterCode, c->hLumFilter, c->hLumFilterPos, 8);

  948.             initMMX2HScaler(c->chrDstW, c->chrXInc, c->chrMmx2FilterCode, c->hChrFilter, c->hChrFilterPos, 4);

  949. 

  950. #ifdef MAP_ANONYMOUS

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

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

  953. #endif

  954.         } else

  955. #endif /* HAVE_MMX2 */

  956.         {

  957.             const int filterAlign=

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

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

  960.                 1;

  961. 

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

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

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

  965.                            srcFilter->lumH, dstFilter->lumH, c->param, 1) < 0)

  966.                 goto fail;

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

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

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

  970.                            srcFilter->chrH, dstFilter->chrH, c->param, 1) < 0)

  971.                 goto fail;

  972.         }

  973.     } // initialize horizontal stuff

  974. 

  975.     /* precalculate vertical scaler filter coefficients */

  976.     {

  977.         const int filterAlign=

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

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

  980.             1;

  981. 

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

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

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

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

  986.             goto fail;

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

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

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

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

  991.             goto fail;

  992. 

  993. #if HAVE_ALTIVEC

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

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

  996. 

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

  998.             int j;

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

  1000.             for (j=0;j<8;j++)

  1001.                 p[j] = c->vLumFilter[i];

  1002.         }

  1003. 

  1004.         for (i=0;i<c->vChrFilterSize*c->chrDstH;i++) {

  1005.             int j;

  1006.             short *p = (short *)&c->vCCoeffsBank[i];

  1007.             for (j=0;j<8;j++)

  1008.                 p[j] = c->vChrFilter[i];

  1009.         }

  1010. #endif

  1011.     }

  1012. 

  1013.     // calculate buffer sizes so that they won't run out while handling these damn slices

  1014.     c->vLumBufSize= c->vLumFilterSize;

  1015.     c->vChrBufSize= c->vChrFilterSize;

  1016.     for (i=0; i<dstH; i++) {

  1017.         int chrI= i*c->chrDstH / dstH;

  1018.         int nextSlice= FFMAX(c->vLumFilterPos[i   ] + c->vLumFilterSize - 1,

  1019.                            ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)<<c->chrSrcVSubSample));

  1020. 

  1021.         nextSlice>>= c->chrSrcVSubSample;

  1022.         nextSlice<<= c->chrSrcVSubSample;

  1023.         if (c->vLumFilterPos[i   ] + c->vLumBufSize < nextSlice)

  1024.             c->vLumBufSize= nextSlice - c->vLumFilterPos[i];

  1025.         if (c->vChrFilterPos[chrI] + c->vChrBufSize < (nextSlice>>c->chrSrcVSubSample))

  1026.             c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI];

  1027.     }

  1028. 

  1029.     // allocate pixbufs (we use dynamic allocation because otherwise we would need to

  1030.     // allocate several megabytes to handle all possible cases)

  1031.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*3*sizeof(int16_t*), fail);

  1032.     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize*3*sizeof(int16_t*), fail);

  1033.     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize*3*sizeof(int16_t*), fail);

  1034.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1035.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*3*sizeof(int16_t*), fail);

  1036.     //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)

  1037.     /* align at 16 bytes for AltiVec */

  1038.     for (i=0; i<c->vLumBufSize; i++) {

  1039.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], dst_stride+16, fail);

  1040.         c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize];

  1041.     }

  1042.     // 64 / (c->dstBpc & ~7) is the same as 16 / sizeof(scaling_intermediate)

  1043.     c->uv_off_px   = dst_stride_px + 64 / (c->dstBpc &~ 7);

  1044.     c->uv_off_byte = dst_stride + 16;

  1045.     for (i=0; i<c->vChrBufSize; i++) {

  1046.         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i+c->vChrBufSize], dst_stride*2+32, fail);

  1047.         c->chrUPixBuf[i] = c->chrUPixBuf[i+c->vChrBufSize];

  1048.         c->chrVPixBuf[i] = c->chrVPixBuf[i+c->vChrBufSize] = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

  1049.     }

  1050.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1051.         for (i=0; i<c->vLumBufSize; i++) {

  1052.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], dst_stride+16, fail);

  1053.             c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize];

  1054.         }

  1055. 

  1056.     //try to avoid drawing green stuff between the right end and the stride end

  1057.     for (i=0; i<c->vChrBufSize; i++)

  1058.         memset(c->chrUPixBuf[i], 64, dst_stride*2+1);

  1059. 

  1060.     assert(c->chrDstH <= dstH);

  1061. 

  1062.     if (flags&SWS_PRINT_INFO) {

  1063.         if      (flags&SWS_FAST_BILINEAR) av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1064.         else if (flags&SWS_BILINEAR)      av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1065.         else if (flags&SWS_BICUBIC)       av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1066.         else if (flags&SWS_X)             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1067.         else if (flags&SWS_POINT)         av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1068.         else if (flags&SWS_AREA)          av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1069.         else if (flags&SWS_BICUBLIN)      av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1070.         else if (flags&SWS_GAUSS)         av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1071.         else if (flags&SWS_SINC)          av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1072.         else if (flags&SWS_LANCZOS)       av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1073.         else if (flags&SWS_SPLINE)        av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1074.         else                              av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1075. 

  1076.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1077.                sws_format_name(srcFormat),

  1078. #ifdef DITHER1XBPP

  1079.                dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 ||

  1080.                dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1081.                dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ? "dithered " : "",

  1082. #else

  1083.                "",

  1084. #endif

  1085.                sws_format_name(dstFormat));

  1086. 

  1087.         if      (HAVE_MMX2     && cpu_flags & AV_CPU_FLAG_MMX2)    av_log(c, AV_LOG_INFO, "using MMX2\n");

  1088.         else if (HAVE_AMD3DNOW && cpu_flags & AV_CPU_FLAG_3DNOW)   av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1089.         else if (HAVE_MMX      && cpu_flags & AV_CPU_FLAG_MMX)     av_log(c, AV_LOG_INFO, "using MMX\n");

  1090.         else if (HAVE_ALTIVEC  && cpu_flags & AV_CPU_FLAG_ALTIVEC) av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1091.         else                                   av_log(c, AV_LOG_INFO, "using C\n");

  1092. 

  1093.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1094.         av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1095.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1096.         av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1097.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc);

  1098.     }

  1099. 

  1100.     c->swScale= ff_getSwsFunc(c);

  1101.     return 0;

  1102. fail: //FIXME replace things by appropriate error codes

  1103.     return -1;

  1104. }

  1105. 

  1106. #if FF_API_SWS_GETCONTEXT

  1107. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  1108.                            int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1109.                            SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1110. {

  1111.     SwsContext *c;

  1112. 

  1113.     if(!(c=sws_alloc_context()))

  1114.         return NULL;

  1115. 

  1116.     c->flags= flags;

  1117.     c->srcW= srcW;

  1118.     c->srcH= srcH;

  1119.     c->dstW= dstW;

  1120.     c->dstH= dstH;

  1121.     c->srcRange = handle_jpeg(&srcFormat);

  1122.     c->dstRange = handle_jpeg(&dstFormat);

  1123.     c->srcFormat= srcFormat;

  1124.     c->dstFormat= dstFormat;

  1125. 

  1126.     if (param) {

  1127.         c->param[0] = param[0];

  1128.         c->param[1] = param[1];

  1129.     }

  1130.     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);

  1131. 

  1132.     if(sws_init_context(c, srcFilter, dstFilter) < 0){

  1133.         sws_freeContext(c);

  1134.         return NULL;

  1135.     }

  1136. 

  1137.     return c;

  1138. }

  1139. #endif

  1140. 

  1141. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1142.                                 float lumaSharpen, float chromaSharpen,

  1143.                                 float chromaHShift, float chromaVShift,

  1144.                                 int verbose)

  1145. {

  1146.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));

  1147.     if (!filter)

  1148.         return NULL;

  1149. 

  1150.     if (lumaGBlur!=0.0) {

  1151.         filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);

  1152.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);

  1153.     } else {

  1154.         filter->lumH= sws_getIdentityVec();

  1155.         filter->lumV= sws_getIdentityVec();

  1156.     }

  1157. 

  1158.     if (chromaGBlur!=0.0) {

  1159.         filter->chrH= sws_getGaussianVec(chromaGBlur, 3.0);

  1160.         filter->chrV= sws_getGaussianVec(chromaGBlur, 3.0);

  1161.     } else {

  1162.         filter->chrH= sws_getIdentityVec();

  1163.         filter->chrV= sws_getIdentityVec();

  1164.     }

  1165. 

  1166.     if (chromaSharpen!=0.0) {

  1167.         SwsVector *id= sws_getIdentityVec();

  1168.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1169.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1170.         sws_addVec(filter->chrH, id);

  1171.         sws_addVec(filter->chrV, id);

  1172.         sws_freeVec(id);

  1173.     }

  1174. 

  1175.     if (lumaSharpen!=0.0) {

  1176.         SwsVector *id= sws_getIdentityVec();

  1177.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1178.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1179.         sws_addVec(filter->lumH, id);

  1180.         sws_addVec(filter->lumV, id);

  1181.         sws_freeVec(id);

  1182.     }

  1183. 

  1184.     if (chromaHShift != 0.0)

  1185.         sws_shiftVec(filter->chrH, (int)(chromaHShift+0.5));

  1186. 

  1187.     if (chromaVShift != 0.0)

  1188.         sws_shiftVec(filter->chrV, (int)(chromaVShift+0.5));

  1189. 

  1190.     sws_normalizeVec(filter->chrH, 1.0);

  1191.     sws_normalizeVec(filter->chrV, 1.0);

  1192.     sws_normalizeVec(filter->lumH, 1.0);

  1193.     sws_normalizeVec(filter->lumV, 1.0);

  1194. 

  1195.     if (verbose) sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1196.     if (verbose) sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1197. 

  1198.     return filter;

  1199. }

  1200. 

  1201. SwsVector *sws_allocVec(int length)

  1202. {

  1203.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1204.     if (!vec)

  1205.         return NULL;

  1206.     vec->length = length;

  1207.     vec->coeff  = av_malloc(sizeof(double) * length);

  1208.     if (!vec->coeff)

  1209.         av_freep(&vec);

  1210.     return vec;

  1211. }

  1212. 

  1213. SwsVector *sws_getGaussianVec(double variance, double quality)

  1214. {

  1215.     const int length= (int)(variance*quality + 0.5) | 1;

  1216.     int i;

  1217.     double middle= (length-1)*0.5;

  1218.     SwsVector *vec= sws_allocVec(length);

  1219. 

  1220.     if (!vec)

  1221.         return NULL;

  1222. 

  1223.     for (i=0; i<length; i++) {

  1224.         double dist= i-middle;

  1225.         vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*M_PI);

  1226.     }

  1227. 

  1228.     sws_normalizeVec(vec, 1.0);

  1229. 

  1230.     return vec;

  1231. }

  1232. 

  1233. SwsVector *sws_getConstVec(double c, int length)

  1234. {

  1235.     int i;

  1236.     SwsVector *vec= sws_allocVec(length);

  1237. 

  1238.     if (!vec)

  1239.         return NULL;

  1240. 

  1241.     for (i=0; i<length; i++)

  1242.         vec->coeff[i]= c;

  1243. 

  1244.     return vec;

  1245. }

  1246. 

  1247. SwsVector *sws_getIdentityVec(void)

  1248. {

  1249.     return sws_getConstVec(1.0, 1);

  1250. }

  1251. 

  1252. static double sws_dcVec(SwsVector *a)

  1253. {

  1254.     int i;

  1255.     double sum=0;

  1256. 

  1257.     for (i=0; i<a->length; i++)

  1258.         sum+= a->coeff[i];

  1259. 

  1260.     return sum;

  1261. }

  1262. 

  1263. void sws_scaleVec(SwsVector *a, double scalar)

  1264. {

  1265.     int i;

  1266. 

  1267.     for (i=0; i<a->length; i++)

  1268.         a->coeff[i]*= scalar;

  1269. }

  1270. 

  1271. void sws_normalizeVec(SwsVector *a, double height)

  1272. {

  1273.     sws_scaleVec(a, height/sws_dcVec(a));

  1274. }

  1275. 

  1276. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1277. {

  1278.     int length= a->length + b->length - 1;

  1279.     int i, j;

  1280.     SwsVector *vec= sws_getConstVec(0.0, length);

  1281. 

  1282.     if (!vec)

  1283.         return NULL;

  1284. 

  1285.     for (i=0; i<a->length; i++) {

  1286.         for (j=0; j<b->length; j++) {

  1287.             vec->coeff[i+j]+= a->coeff[i]*b->coeff[j];

  1288.         }

  1289.     }

  1290. 

  1291.     return vec;

  1292. }

  1293. 

  1294. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1295. {

  1296.     int length= FFMAX(a->length, b->length);

  1297.     int i;

  1298.     SwsVector *vec= sws_getConstVec(0.0, length);

  1299. 

  1300.     if (!vec)

  1301.         return NULL;

  1302. 

  1303.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1304.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]+= b->coeff[i];

  1305. 

  1306.     return vec;

  1307. }

  1308. 

  1309. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1310. {

  1311.     int length= FFMAX(a->length, b->length);

  1312.     int i;

  1313.     SwsVector *vec= sws_getConstVec(0.0, length);

  1314. 

  1315.     if (!vec)

  1316.         return NULL;

  1317. 

  1318.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1319.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]-= b->coeff[i];

  1320. 

  1321.     return vec;

  1322. }

  1323. 

  1324. /* shift left / or right if "shift" is negative */

  1325. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1326. {

  1327.     int length= a->length + FFABS(shift)*2;

  1328.     int i;

  1329.     SwsVector *vec= sws_getConstVec(0.0, length);

  1330. 

  1331.     if (!vec)

  1332.         return NULL;

  1333. 

  1334.     for (i=0; i<a->length; i++) {

  1335.         vec->coeff[i + (length-1)/2 - (a->length-1)/2 - shift]= a->coeff[i];

  1336.     }

  1337. 

  1338.     return vec;

  1339. }

  1340. 

  1341. void sws_shiftVec(SwsVector *a, int shift)

  1342. {

  1343.     SwsVector *shifted= sws_getShiftedVec(a, shift);

  1344.     av_free(a->coeff);

  1345.     a->coeff= shifted->coeff;

  1346.     a->length= shifted->length;

  1347.     av_free(shifted);

  1348. }

  1349. 

  1350. void sws_addVec(SwsVector *a, SwsVector *b)

  1351. {

  1352.     SwsVector *sum= sws_sumVec(a, b);

  1353.     av_free(a->coeff);

  1354.     a->coeff= sum->coeff;

  1355.     a->length= sum->length;

  1356.     av_free(sum);

  1357. }

  1358. 

  1359. void sws_subVec(SwsVector *a, SwsVector *b)

  1360. {

  1361.     SwsVector *diff= sws_diffVec(a, b);

  1362.     av_free(a->coeff);

  1363.     a->coeff= diff->coeff;

  1364.     a->length= diff->length;

  1365.     av_free(diff);

  1366. }

  1367. 

  1368. void sws_convVec(SwsVector *a, SwsVector *b)

  1369. {

  1370.     SwsVector *conv= sws_getConvVec(a, b);

  1371.     av_free(a->coeff);

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

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

  1374.     av_free(conv);

  1375. }

  1376. 

  1377. SwsVector *sws_cloneVec(SwsVector *a)

  1378. {

  1379.     int i;

  1380.     SwsVector *vec= sws_allocVec(a->length);

  1381. 

  1382.     if (!vec)

  1383.         return NULL;

  1384. 

  1385.     for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];

  1386. 

  1387.     return vec;

  1388. }

  1389. 

  1390. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1391. {

  1392.     int i;

  1393.     double max=0;

  1394.     double min=0;

  1395.     double range;

  1396. 

  1397.     for (i=0; i<a->length; i++)

  1398.         if (a->coeff[i]>max) max= a->coeff[i];

  1399. 

  1400.     for (i=0; i<a->length; i++)

  1401.         if (a->coeff[i]<min) min= a->coeff[i];

  1402. 

  1403.     range= max - min;

  1404. 

  1405.     for (i=0; i<a->length; i++) {

  1406.         int x= (int)((a->coeff[i]-min)*60.0/range +0.5);

  1407.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1408.         for (;x>0; x--) av_log(log_ctx, log_level, " ");

  1409.         av_log(log_ctx, log_level, "|\n");

  1410.     }

  1411. }

  1412. 

  1413. void sws_freeVec(SwsVector *a)

  1414. {

  1415.     if (!a) return;

  1416.     av_freep(&a->coeff);

  1417.     a->length=0;

  1418.     av_free(a);

  1419. }

  1420. 

  1421. void sws_freeFilter(SwsFilter *filter)

  1422. {

  1423.     if (!filter) return;

  1424. 

  1425.     if (filter->lumH) sws_freeVec(filter->lumH);

  1426.     if (filter->lumV) sws_freeVec(filter->lumV);

  1427.     if (filter->chrH) sws_freeVec(filter->chrH);

  1428.     if (filter->chrV) sws_freeVec(filter->chrV);

  1429.     av_free(filter);

  1430. }

  1431. 

  1432. void sws_freeContext(SwsContext *c)

  1433. {

  1434.     int i;

  1435.     if (!c) return;

  1436. 

  1437.     if (c->lumPixBuf) {

  1438.         for (i=0; i<c->vLumBufSize; i++)

  1439.             av_freep(&c->lumPixBuf[i]);

  1440.         av_freep(&c->lumPixBuf);

  1441.     }

  1442. 

  1443.     if (c->chrUPixBuf) {

  1444.         for (i=0; i<c->vChrBufSize; i++)

  1445.             av_freep(&c->chrUPixBuf[i]);

  1446.         av_freep(&c->chrUPixBuf);

  1447.         av_freep(&c->chrVPixBuf);

  1448.     }

  1449. 

  1450.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1451.         for (i=0; i<c->vLumBufSize; i++)

  1452.             av_freep(&c->alpPixBuf[i]);

  1453.         av_freep(&c->alpPixBuf);

  1454.     }

  1455. 

  1456.     av_freep(&c->vLumFilter);

  1457.     av_freep(&c->vChrFilter);

  1458.     av_freep(&c->hLumFilter);

  1459.     av_freep(&c->hChrFilter);

  1460. #if HAVE_ALTIVEC

  1461.     av_freep(&c->vYCoeffsBank);

  1462.     av_freep(&c->vCCoeffsBank);

  1463. #endif

  1464. 

  1465.     av_freep(&c->vLumFilterPos);

  1466.     av_freep(&c->vChrFilterPos);

  1467.     av_freep(&c->hLumFilterPos);

  1468.     av_freep(&c->hChrFilterPos);

  1469. 

  1470. #if HAVE_MMX

  1471. #ifdef MAP_ANONYMOUS

  1472.     if (c->lumMmx2FilterCode) munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1473.     if (c->chrMmx2FilterCode) munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1474. #elif HAVE_VIRTUALALLOC

  1475.     if (c->lumMmx2FilterCode) VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1476.     if (c->chrMmx2FilterCode) VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1477. #else

  1478.     av_free(c->lumMmx2FilterCode);

  1479.     av_free(c->chrMmx2FilterCode);

  1480. #endif

  1481.     c->lumMmx2FilterCode=NULL;

  1482.     c->chrMmx2FilterCode=NULL;

  1483. #endif /* HAVE_MMX */

  1484. 

  1485.     av_freep(&c->yuvTable);

  1486.     av_free(c->formatConvBuffer);

  1487. 

  1488.     av_free(c);

  1489. }

  1490. 

  1491. struct SwsContext *sws_getCachedContext(struct SwsContext *context,

  1492.                                         int srcW, int srcH, enum PixelFormat srcFormat,

  1493.                                         int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1494.                                         SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1495. {

  1496.     static const double default_param[2] = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT};

  1497. 

  1498.     if (!param)

  1499.         param = default_param;

  1500. 

  1501.     if (context &&

  1502.         (context->srcW      != srcW      ||

  1503.          context->srcH      != srcH      ||

  1504.          context->srcFormat != srcFormat ||

  1505.          context->dstW      != dstW      ||

  1506.          context->dstH      != dstH      ||

  1507.          context->dstFormat != dstFormat ||

  1508.          context->flags     != flags     ||

  1509.          context->param[0]  != param[0]  ||

  1510.          context->param[1]  != param[1])) {

  1511.         sws_freeContext(context);

  1512.         context = NULL;

  1513.     }

  1514. 

  1515.     if (!context) {

  1516.         if (!(context = sws_alloc_context()))

  1517.             return NULL;

  1518.         context->srcW      = srcW;

  1519.         context->srcH      = srcH;

  1520.         context->srcRange  = handle_jpeg(&srcFormat);

  1521.         context->srcFormat = srcFormat;

  1522.         context->dstW      = dstW;

  1523.         context->dstH      = dstH;

  1524.         context->dstRange  = handle_jpeg(&dstFormat);

  1525.         context->dstFormat = dstFormat;

  1526.         context->flags     = flags;

  1527.         context->param[0]  = param[0];

  1528.         context->param[1]  = param[1];

  1529.         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);

  1530.         if (sws_init_context(context, srcFilter, dstFilter) < 0) {

  1531.             sws_freeContext(context);

  1532.             return NULL;

  1533.         }

  1534.     }

  1535.     return context;

  1536. }