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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/avutil.h"

  45. #include "libavutil/bswap.h"

  46. #include "libavutil/pixdesc.h"

  47. 

  48. unsigned swscale_version(void)

  49. {

  50.     return LIBSWSCALE_VERSION_INT;

  51. }

  52. 

  53. const char *swscale_configuration(void)

  54. {

  55.     return FFMPEG_CONFIGURATION;

  56. }

  57. 

  58. const char *swscale_license(void)

  59. {

  60. #define LICENSE_PREFIX "libswscale license: "

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

  62. }

  63. 

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

  65. 

  66. #define isSupportedIn(x)    (       \

  67.            (x)==PIX_FMT_YUV420P     \

  68.         || (x)==PIX_FMT_YUVA420P    \

  69.         || (x)==PIX_FMT_YUYV422     \

  70.         || (x)==PIX_FMT_UYVY422     \

  71.         || (x)==PIX_FMT_RGB48BE     \

  72.         || (x)==PIX_FMT_RGB48LE     \

  73.         || (x)==PIX_FMT_RGB32       \

  74.         || (x)==PIX_FMT_RGB32_1     \

  75.         || (x)==PIX_FMT_BGR24       \

  76.         || (x)==PIX_FMT_BGR565      \

  77.         || (x)==PIX_FMT_BGR555      \

  78.         || (x)==PIX_FMT_BGR32       \

  79.         || (x)==PIX_FMT_BGR32_1     \

  80.         || (x)==PIX_FMT_RGB24       \

  81.         || (x)==PIX_FMT_RGB565      \

  82.         || (x)==PIX_FMT_RGB555      \

  83.         || (x)==PIX_FMT_GRAY8       \

  84.         || (x)==PIX_FMT_Y400A       \

  85.         || (x)==PIX_FMT_YUV410P     \

  86.         || (x)==PIX_FMT_YUV440P     \

  87.         || (x)==PIX_FMT_NV12        \

  88.         || (x)==PIX_FMT_NV21        \

  89.         || (x)==PIX_FMT_GRAY16BE    \

  90.         || (x)==PIX_FMT_GRAY16LE    \

  91.         || (x)==PIX_FMT_YUV444P     \

  92.         || (x)==PIX_FMT_YUV422P     \

  93.         || (x)==PIX_FMT_YUV411P     \

  94.         || (x)==PIX_FMT_YUVJ420P    \

  95.         || (x)==PIX_FMT_YUVJ422P    \

  96.         || (x)==PIX_FMT_YUVJ440P    \

  97.         || (x)==PIX_FMT_YUVJ444P    \

  98.         || (x)==PIX_FMT_PAL8        \

  99.         || (x)==PIX_FMT_BGR8        \

  100.         || (x)==PIX_FMT_RGB8        \

  101.         || (x)==PIX_FMT_BGR4_BYTE   \

  102.         || (x)==PIX_FMT_RGB4_BYTE   \

  103.         || (x)==PIX_FMT_YUV440P     \

  104.         || (x)==PIX_FMT_MONOWHITE   \

  105.         || (x)==PIX_FMT_MONOBLACK   \

  106.         || (x)==PIX_FMT_YUV420P16LE   \

  107.         || (x)==PIX_FMT_YUV422P16LE   \

  108.         || (x)==PIX_FMT_YUV444P16LE   \

  109.         || (x)==PIX_FMT_YUV420P16BE   \

  110.         || (x)==PIX_FMT_YUV422P16BE   \

  111.         || (x)==PIX_FMT_YUV444P16BE   \

  112.     )

  113. 

  114. int sws_isSupportedInput(enum PixelFormat pix_fmt)

  115. {

  116.     return isSupportedIn(pix_fmt);

  117. }

  118. 

  119. #define isSupportedOut(x)   (       \

  120.            (x)==PIX_FMT_YUV420P     \

  121.         || (x)==PIX_FMT_YUVA420P    \

  122.         || (x)==PIX_FMT_YUYV422     \

  123.         || (x)==PIX_FMT_UYVY422     \

  124.         || (x)==PIX_FMT_YUV444P     \

  125.         || (x)==PIX_FMT_YUV422P     \

  126.         || (x)==PIX_FMT_YUV411P     \

  127.         || (x)==PIX_FMT_YUVJ420P    \

  128.         || (x)==PIX_FMT_YUVJ422P    \

  129.         || (x)==PIX_FMT_YUVJ440P    \

  130.         || (x)==PIX_FMT_YUVJ444P    \

  131.         || isAnyRGB(x)              \

  132.         || (x)==PIX_FMT_NV12        \

  133.         || (x)==PIX_FMT_NV21        \

  134.         || (x)==PIX_FMT_GRAY16BE    \

  135.         || (x)==PIX_FMT_GRAY16LE    \

  136.         || (x)==PIX_FMT_GRAY8       \

  137.         || (x)==PIX_FMT_YUV410P     \

  138.         || (x)==PIX_FMT_YUV440P     \

  139.         || (x)==PIX_FMT_YUV420P16LE   \

  140.         || (x)==PIX_FMT_YUV422P16LE   \

  141.         || (x)==PIX_FMT_YUV444P16LE   \

  142.         || (x)==PIX_FMT_YUV420P16BE   \

  143.         || (x)==PIX_FMT_YUV422P16BE   \

  144.         || (x)==PIX_FMT_YUV444P16BE   \

  145.     )

  146. 

  147. int sws_isSupportedOutput(enum PixelFormat pix_fmt)

  148. {

  149.     return isSupportedOut(pix_fmt);

  150. }

  151. 

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

  153. 

  154. const char *sws_format_name(enum PixelFormat format)

  155. {

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

  157.         return av_pix_fmt_descriptors[format].name;

  158.     else

  159.         return "Unknown format";

  160. }

  161. 

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

  163. {

  164. //    printf("%f %f %f %f %f\n", a,b,c,d,dist);

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

  166.     else           return getSplineCoeff(        0.0,

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

  168.                                                  c + 3.0*d,

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

  170.                                          dist-1.0);

  171. }

  172. 

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

  174.                       int srcW, int dstW, int filterAlign, int one, int flags,

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

  176. {

  177.     int i;

  178.     int filterSize;

  179.     int filter2Size;

  180.     int minFilterSize;

  181.     int64_t *filter=NULL;

  182.     int64_t *filter2=NULL;

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

  184.     int ret= -1;

  185. #if ARCH_X86

  186.     if (flags & SWS_CPU_CAPS_MMX)

  187.         __asm__ volatile("emms\n\t"::: "memory"); //FIXME this should not be required but it IS (even for non-MMX versions)

  188. #endif

  189. 

  190.     // NOTE: the +1 is for the MMX scaler which reads over the end

  191.     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW+1)*sizeof(int16_t), fail);

  192. 

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

  194.         int i;

  195.         filterSize= 1;

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

  197. 

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

  199.             filter[i*filterSize]= fone;

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

  201.         }

  202. 

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

  204.         int i;

  205.         int xDstInSrc;

  206.         filterSize= 1;

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

  208. 

  209.         xDstInSrc= xInc/2 - 0x8000;

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

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

  212. 

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

  214.             filter[i]= fone;

  215.             xDstInSrc+= xInc;

  216.         }

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

  218.         int i;

  219.         int xDstInSrc;

  220.         filterSize= 2;

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

  222. 

  223.         xDstInSrc= xInc/2 - 0x8000;

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

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

  226.             int j;

  227. 

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

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

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

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

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

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

  234.                 xx++;

  235.             }

  236.             xDstInSrc+= xInc;

  237.         }

  238.     } else {

  239.         int xDstInSrc;

  240.         int sizeFactor;

  241. 

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

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

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

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

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

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

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

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

  250.         else {

  251.             sizeFactor= 0; //GCC warning killer

  252.             assert(0);

  253.         }

  254. 

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

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

  257. 

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

  259. 

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

  261. 

  262.         xDstInSrc= xInc - 0x10000;

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

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

  265.             int j;

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

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

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

  269.                 double floatd;

  270.                 int64_t coeff;

  271. 

  272.                 if (xInc > 1<<16)

  273.                     d= d*dstW/srcW;

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

  275. 

  276.                 if (flags & SWS_BICUBIC) {

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

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

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

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

  281. 

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

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

  284.                     else if (d < 1LL<<31)

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

  286.                     else

  287.                         coeff=0.0;

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

  289.                 }

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

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

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

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

  294.                 }*/

  295.                 else if (flags & SWS_X) {

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

  297.                     double c;

  298. 

  299.                     if (floatd<1.0)

  300.                         c = cos(floatd*M_PI);

  301.                     else

  302.                         c=-1.0;

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

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

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

  306.                 } else if (flags & SWS_AREA) {

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

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

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

  310.                     else coeff=0.0;

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

  312.                 } else if (flags & SWS_GAUSS) {

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

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

  315.                 } else if (flags & SWS_SINC) {

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

  317.                 } else if (flags & SWS_LANCZOS) {

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

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

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

  321.                 } else if (flags & SWS_BILINEAR) {

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

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

  324.                     coeff *= fone >> 30;

  325.                 } else if (flags & SWS_SPLINE) {

  326.                     double p=-2.196152422706632;

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

  328.                 } else {

  329.                     coeff= 0.0; //GCC warning killer

  330.                     assert(0);

  331.                 }

  332. 

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

  334.                 xx++;

  335.             }

  336.             xDstInSrc+= 2*xInc;

  337.         }

  338.     }

  339. 

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

  341.        av_free(filter);

  342.     */

  343.     assert(filterSize>0);

  344.     filter2Size= filterSize;

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

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

  347.     assert(filter2Size>0);

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

  349. 

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

  351.         int j, k;

  352. 

  353.         if(srcFilter) {

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

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

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

  357.             }

  358.         } else {

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

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

  361.         }

  362.         //FIXME dstFilter

  363. 

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

  365.     }

  366.     av_freep(&filter);

  367. 

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

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

  370.     minFilterSize= 0;

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

  372.         int min= filter2Size;

  373.         int j;

  374.         int64_t cutOff=0.0;

  375. 

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

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

  378.             int k;

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

  380. 

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

  382. 

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

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

  385. 

  386.             // move filter coefficients left

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

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

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

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

  391.         }

  392. 

  393.         cutOff=0;

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

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

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

  397. 

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

  399.             min--;

  400.         }

  401. 

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

  403.     }

  404. 

  405.     if (flags & SWS_CPU_CAPS_ALTIVEC) {

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

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

  408.         if (minFilterSize < 5)

  409.             filterAlign = 4;

  410. 

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

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

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

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

  415.         // decent-sized vector.

  416.         if (minFilterSize < 3)

  417.             filterAlign = 1;

  418.     }

  419. 

  420.     if (flags & SWS_CPU_CAPS_MMX) {

  421.         // special case for unscaled vertical filtering

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

  423.             filterAlign= 1;

  424.     }

  425. 

  426.     assert(minFilterSize > 0);

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

  428.     assert(filterSize > 0);

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

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

  431.         goto fail;

  432.     *outFilterSize= filterSize;

  433. 

  434.     if (flags&SWS_PRINT_INFO)

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

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

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

  438.         int j;

  439. 

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

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

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

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

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

  445.         }

  446.     }

  447. 

  448.     //FIXME try to align filterPos if possible

  449. 

  450.     //fix borders

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

  452.         int j;

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

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

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

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

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

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

  459.             }

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

  461.         }

  462. 

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

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

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

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

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

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

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

  470.             }

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

  472.         }

  473.     }

  474. 

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

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

  477.     FF_ALLOCZ_OR_GOTO(NULL, *outFilter, *outFilterSize*(dstW+1)*sizeof(int16_t), fail);

  478. 

  479.     /* normalize & store in outFilter */

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

  481.         int j;

  482.         int64_t error=0;

  483.         int64_t sum=0;

  484. 

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

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

  487.         }

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

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

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

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

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

  493.             error= v - intV*sum;

  494.         }

  495.     }

  496. 

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

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

  499.         int j= dstW*(*outFilterSize);

  500.         (*outFilter)[j + i]= (*outFilter)[j + i - (*outFilterSize)];

  501.     }

  502. 

  503.     ret=0;

  504. fail:

  505.     av_free(filter);

  506.     av_free(filter2);

  507.     return ret;

  508. }

  509. 

  510. #if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT)

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

  512. {

  513.     uint8_t *fragmentA;

  514.     x86_reg imm8OfPShufW1A;

  515.     x86_reg imm8OfPShufW2A;

  516.     x86_reg fragmentLengthA;

  517.     uint8_t *fragmentB;

  518.     x86_reg imm8OfPShufW1B;

  519.     x86_reg imm8OfPShufW2B;

  520.     x86_reg fragmentLengthB;

  521.     int fragmentPos;

  522. 

  523.     int xpos, i;

  524. 

  525.     // create an optimized horizontal scaling routine

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

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

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

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

  530.      * of fragmentA is used.

  531.      */

  532. 

  533.     //code fragment

  534. 

  535.     __asm__ volatile(

  536.         "jmp                         9f                 \n\t"

  537.     // Begin

  538.         "0:                                             \n\t"

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

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

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

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

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

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

  545.         "1:                                             \n\t"

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

  547.         "2:                                             \n\t"

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

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

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

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

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

  553. 

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

  555. 

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

  557.     // End

  558.         "9:                                             \n\t"

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

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

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

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

  563.         "dec                         %1                 \n\t"

  564.         "dec                         %2                 \n\t"

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

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

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

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

  569. 

  570. 

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

  572.         "=r" (fragmentLengthA)

  573.     );

  574. 

  575.     __asm__ volatile(

  576.         "jmp                         9f                 \n\t"

  577.     // Begin

  578.         "0:                                             \n\t"

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

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

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

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

  583.         "1:                                             \n\t"

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

  585.         "2:                                             \n\t"

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

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

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

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

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

  591. 

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

  593. 

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

  595.     // End

  596.         "9:                                             \n\t"

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

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

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

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

  601.         "dec                         %1                 \n\t"

  602.         "dec                         %2                 \n\t"

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

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

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

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

  607. 

  608. 

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

  610.         "=r" (fragmentLengthB)

  611.     );

  612. 

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

  614.     fragmentPos=0;

  615. 

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

  617.         int xx=xpos>>16;

  618. 

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

  620.             int a=0;

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

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

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

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

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

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

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

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

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

  630.             int shift=0;

  631. 

  632.             if (filterCode) {

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

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

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

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

  637.                 filterPos[i/2]= xx;

  638. 

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

  640. 

  641.                 filterCode[fragmentPos + imm8OfPShufW1]=

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

  643.                 filterCode[fragmentPos + imm8OfPShufW2]=

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

  645. 

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

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

  648. 

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

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

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

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

  653.                 }

  654.             }

  655. 

  656.             fragmentPos+= fragmentLength;

  657. 

  658.             if (filterCode)

  659.                 filterCode[fragmentPos]= RET;

  660.         }

  661.         xpos+=xInc;

  662.     }

  663.     if (filterCode)

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

  665. 

  666.     return fragmentPos + 1;

  667. }

  668. #endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) */

  669. 

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

  671. {

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

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

  674. }

  675. 

  676. static int update_flags_cpu(int flags);

  677. 

  678. int sws_setColorspaceDetails(SwsContext *c, const int inv_table[4], int srcRange, const int table[4], int dstRange, int brightness, int contrast, int saturation)

  679. {

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

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

  682. 

  683.     c->brightness= brightness;

  684.     c->contrast  = contrast;

  685.     c->saturation= saturation;

  686.     c->srcRange  = srcRange;

  687.     c->dstRange  = dstRange;

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

  689. 

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

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

  692.     c->flags = update_flags_cpu(c->flags);

  693. 

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

  695.     //FIXME factorize

  696. 

  697. #if HAVE_ALTIVEC

  698.     if (c->flags & SWS_CPU_CAPS_ALTIVEC)

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

  700. #endif

  701.     return 0;

  702. }

  703. 

  704. int sws_getColorspaceDetails(SwsContext *c, int **inv_table, int *srcRange, int **table, int *dstRange, int *brightness, int *contrast, int *saturation)

  705. {

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

  707. 

  708.     *inv_table = c->srcColorspaceTable;

  709.     *table     = c->dstColorspaceTable;

  710.     *srcRange  = c->srcRange;

  711.     *dstRange  = c->dstRange;

  712.     *brightness= c->brightness;

  713.     *contrast  = c->contrast;

  714.     *saturation= c->saturation;

  715. 

  716.     return 0;

  717. }

  718. 

  719. static int handle_jpeg(enum PixelFormat *format)

  720. {

  721.     switch (*format) {

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

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

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

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

  726.     default:                                          return 0;

  727.     }

  728. }

  729. 

  730. static int update_flags_cpu(int flags)

  731. {

  732. #if !CONFIG_RUNTIME_CPUDETECT //ensure that the flags match the compiled variant if cpudetect is off

  733.     flags &= ~( SWS_CPU_CAPS_MMX

  734.                |SWS_CPU_CAPS_MMX2

  735.                |SWS_CPU_CAPS_3DNOW

  736.                |SWS_CPU_CAPS_SSE2

  737.                |SWS_CPU_CAPS_ALTIVEC

  738.                |SWS_CPU_CAPS_BFIN);

  739.     flags |= ff_hardcodedcpuflags();

  740. #endif /* CONFIG_RUNTIME_CPUDETECT */

  741.     return flags;

  742. }

  743. 

  744. SwsContext *sws_alloc_context(void){

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

  746. 

  747.     c->av_class = &sws_context_class;

  748. 

  749.     return c;

  750. }

  751. 

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

  753.     int i;

  754.     int usesVFilter, usesHFilter;

  755.     int unscaled;

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

  757.     int srcW= c->srcW;

  758.     int srcH= c->srcH;

  759.     int dstW= c->dstW;

  760.     int dstH= c->dstH;

  761.     int flags;

  762.     enum PixelFormat srcFormat= c->srcFormat;

  763.     enum PixelFormat dstFormat= c->dstFormat;

  764. 

  765.     flags= c->flags = update_flags_cpu(c->flags);

  766. #if ARCH_X86

  767.     if (flags & SWS_CPU_CAPS_MMX)

  768.         __asm__ volatile("emms\n\t"::: "memory");

  769. #endif

  770.     if (!rgb15to16) sws_rgb2rgb_init(flags);

  771. 

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

  773. 

  774.     if (!isSupportedIn(srcFormat)) {

  775.         av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as input pixel format\n", sws_format_name(srcFormat));

  776.         return AVERROR(EINVAL);

  777.     }

  778.     if (!isSupportedOut(dstFormat)) {

  779.         av_log(NULL, AV_LOG_ERROR, "swScaler: %s is not supported as output pixel format\n", sws_format_name(dstFormat));

  780.         return AVERROR(EINVAL);

  781.     }

  782. 

  783.     i= flags & ( SWS_POINT

  784.                 |SWS_AREA

  785.                 |SWS_BILINEAR

  786.                 |SWS_FAST_BILINEAR

  787.                 |SWS_BICUBIC

  788.                 |SWS_X

  789.                 |SWS_GAUSS

  790.                 |SWS_LANCZOS

  791.                 |SWS_SINC

  792.                 |SWS_SPLINE

  793.                 |SWS_BICUBLIN);

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

  795.         av_log(NULL, AV_LOG_ERROR, "swScaler: Exactly one scaler algorithm must be chosen\n");

  796.         return AVERROR(EINVAL);

  797.     }

  798.     /* sanity check */

  799.     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

  800.         av_log(NULL, AV_LOG_ERROR, "swScaler: %dx%d -> %dx%d is invalid scaling dimension\n",

  801.                srcW, srcH, dstW, dstH);

  802.         return AVERROR(EINVAL);

  803.     }

  804.     if(srcW > VOFW || dstW > VOFW) {

  805.         av_log(NULL, AV_LOG_ERROR, "swScaler: Compile-time maximum width is "AV_STRINGIFY(VOFW)" change VOF/VOFW and recompile\n");

  806.         return AVERROR(EINVAL);

  807.     }

  808. 

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

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

  811. 

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

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

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

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

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

  817. 

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

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

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

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

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

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

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

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

  826. 

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

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

  829. 

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

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

  832. 

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

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

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

  836. 

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

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

  839.       && srcFormat!=PIX_FMT_RGB8      && srcFormat!=PIX_FMT_BGR8

  840.       && srcFormat!=PIX_FMT_RGB4      && srcFormat!=PIX_FMT_BGR4

  841.       && srcFormat!=PIX_FMT_RGB4_BYTE && srcFormat!=PIX_FMT_BGR4_BYTE

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

  843.         c->chrSrcHSubSample=1;

  844. 

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

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

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

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

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

  850. 

  851.     /* unscaled special cases */

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

  853.         ff_get_unscaled_swscale(c);

  854. 

  855.         if (c->swScale) {

  856.             if (flags&SWS_PRINT_INFO)

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

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

  859.             return 0;

  860.         }

  861.     }

  862. 

  863.     if (flags & SWS_CPU_CAPS_MMX2) {

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

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

  866.             if (flags&SWS_PRINT_INFO)

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

  868.         }

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

  870.     }

  871.     else

  872.         c->canMMX2BeUsed=0;

  873. 

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

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

  876. 

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

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

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

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

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

  882.     // first and last pixel

  883.     if (flags&SWS_FAST_BILINEAR) {

  884.         if (c->canMMX2BeUsed) {

  885.             c->lumXInc+= 20;

  886.             c->chrXInc+= 20;

  887.         }

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

  889.         else if (flags & SWS_CPU_CAPS_MMX) {

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

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

  892.         }

  893.     }

  894. 

  895.     /* precalculate horizontal scaler filter coefficients */

  896.     {

  897. #if ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT)

  898. // can't downscale !!!

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

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

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

  902. 

  903. #ifdef MAP_ANONYMOUS

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

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

  906. #elif HAVE_VIRTUALALLOC

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

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

  909. #else

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

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

  912. #endif

  913. 

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

  915.                 return AVERROR(ENOMEM);

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

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

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

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

  920. 

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

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

  923. 

  924. #ifdef MAP_ANONYMOUS

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

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

  927. #endif

  928.         } else

  929. #endif /* ARCH_X86 && (HAVE_MMX2 || CONFIG_RUNTIME_CPUDETECT) */

  930.         {

  931.             const int filterAlign=

  932.                 (flags & SWS_CPU_CAPS_MMX) ? 4 :

  933.                 (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :

  934.                 1;

  935. 

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

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

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

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

  940.                 goto fail;

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

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

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

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

  945.                 goto fail;

  946.         }

  947.     } // initialize horizontal stuff

  948. 

  949.     /* precalculate vertical scaler filter coefficients */

  950.     {

  951.         const int filterAlign=

  952.             (flags & SWS_CPU_CAPS_MMX) && (flags & SWS_ACCURATE_RND) ? 2 :

  953.             (flags & SWS_CPU_CAPS_ALTIVEC) ? 8 :

  954.             1;

  955. 

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

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

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

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

  960.             goto fail;

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

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

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

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

  965.             goto fail;

  966. 

  967. #if HAVE_ALTIVEC

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

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

  970. 

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

  972.             int j;

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

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

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

  976.         }

  977. 

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

  979.             int j;

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

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

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

  983.         }

  984. #endif

  985.     }

  986. 

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

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

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

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

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

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

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

  994. 

  995.         nextSlice>>= c->chrSrcVSubSample;

  996.         nextSlice<<= c->chrSrcVSubSample;

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

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

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

  1000.             c->vChrBufSize= (nextSlice>>c->chrSrcVSubSample) - c->vChrFilterPos[chrI];

  1001.     }

  1002. 

  1003.     // allocate pixbufs (we use dynamic allocation because otherwise we would need to

  1004.     // allocate several megabytes to handle all possible cases)

  1005.     FF_ALLOC_OR_GOTO(c, c->lumPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1006.     FF_ALLOC_OR_GOTO(c, c->chrPixBuf, c->vChrBufSize*2*sizeof(int16_t*), fail);

  1007.     if (CONFIG_SWSCALE_ALPHA && isALPHA(c->srcFormat) && isALPHA(c->dstFormat))

  1008.         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize*2*sizeof(int16_t*), fail);

  1009.     //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)

  1010.     /* align at 16 bytes for AltiVec */

  1011.     for (i=0; i<c->vLumBufSize; i++) {

  1012.         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i+c->vLumBufSize], VOF+1, fail);

  1013.         c->lumPixBuf[i] = c->lumPixBuf[i+c->vLumBufSize];

  1014.     }

  1015.     for (i=0; i<c->vChrBufSize; i++) {

  1016.         FF_ALLOC_OR_GOTO(c, c->chrPixBuf[i+c->vChrBufSize], (VOF+1)*2, fail);

  1017.         c->chrPixBuf[i] = c->chrPixBuf[i+c->vChrBufSize];

  1018.     }

  1019.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

  1020.         for (i=0; i<c->vLumBufSize; i++) {

  1021.             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i+c->vLumBufSize], VOF+1, fail);

  1022.             c->alpPixBuf[i] = c->alpPixBuf[i+c->vLumBufSize];

  1023.         }

  1024. 

  1025.     //try to avoid drawing green stuff between the right end and the stride end

  1026.     for (i=0; i<c->vChrBufSize; i++) memset(c->chrPixBuf[i], 64, (VOF+1)*2);

  1027. 

  1028.     assert(2*VOFW == VOF);

  1029. 

  1030.     assert(c->chrDstH <= dstH);

  1031. 

  1032.     if (flags&SWS_PRINT_INFO) {

  1033.         if (flags&SWS_FAST_BILINEAR)

  1034.             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");

  1035.         else if (flags&SWS_BILINEAR)

  1036.             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");

  1037.         else if (flags&SWS_BICUBIC)

  1038.             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");

  1039.         else if (flags&SWS_X)

  1040.             av_log(c, AV_LOG_INFO, "Experimental scaler, ");

  1041.         else if (flags&SWS_POINT)

  1042.             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");

  1043.         else if (flags&SWS_AREA)

  1044.             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");

  1045.         else if (flags&SWS_BICUBLIN)

  1046.             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");

  1047.         else if (flags&SWS_GAUSS)

  1048.             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");

  1049.         else if (flags&SWS_SINC)

  1050.             av_log(c, AV_LOG_INFO, "Sinc scaler, ");

  1051.         else if (flags&SWS_LANCZOS)

  1052.             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");

  1053.         else if (flags&SWS_SPLINE)

  1054.             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");

  1055.         else

  1056.             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

  1057. 

  1058.         av_log(c, AV_LOG_INFO, "from %s to %s%s ",

  1059.                sws_format_name(srcFormat),

  1060. #ifdef DITHER1XBPP

  1061.                dstFormat == PIX_FMT_BGR555 || dstFormat == PIX_FMT_BGR565 ||

  1062.                dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1063.                dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE ? "dithered " : "",

  1064. #else

  1065.                "",

  1066. #endif

  1067.                sws_format_name(dstFormat));

  1068. 

  1069.         if (flags & SWS_CPU_CAPS_MMX2)

  1070.             av_log(c, AV_LOG_INFO, "using MMX2\n");

  1071.         else if (flags & SWS_CPU_CAPS_3DNOW)

  1072.             av_log(c, AV_LOG_INFO, "using 3DNOW\n");

  1073.         else if (flags & SWS_CPU_CAPS_MMX)

  1074.             av_log(c, AV_LOG_INFO, "using MMX\n");

  1075.         else if (flags & SWS_CPU_CAPS_ALTIVEC)

  1076.             av_log(c, AV_LOG_INFO, "using AltiVec\n");

  1077.         else

  1078.             av_log(c, AV_LOG_INFO, "using C\n");

  1079. 

  1080.         if (flags & SWS_CPU_CAPS_MMX) {

  1081.             if (c->canMMX2BeUsed && (flags&SWS_FAST_BILINEAR))

  1082.                 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR MMX2 scaler for horizontal scaling\n");

  1083.             else {

  1084.                 if (c->hLumFilterSize==4)

  1085.                     av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal luminance scaling\n");

  1086.                 else if (c->hLumFilterSize==8)

  1087.                     av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal luminance scaling\n");

  1088.                 else

  1089.                     av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal luminance scaling\n");

  1090. 

  1091.                 if (c->hChrFilterSize==4)

  1092.                     av_log(c, AV_LOG_VERBOSE, "using 4-tap MMX scaler for horizontal chrominance scaling\n");

  1093.                 else if (c->hChrFilterSize==8)

  1094.                     av_log(c, AV_LOG_VERBOSE, "using 8-tap MMX scaler for horizontal chrominance scaling\n");

  1095.                 else

  1096.                     av_log(c, AV_LOG_VERBOSE, "using n-tap MMX scaler for horizontal chrominance scaling\n");

  1097.             }

  1098.         } else {

  1099. #if ARCH_X86

  1100.             av_log(c, AV_LOG_VERBOSE, "using x86 asm scaler for horizontal scaling\n");

  1101. #else

  1102.             if (flags & SWS_FAST_BILINEAR)

  1103.                 av_log(c, AV_LOG_VERBOSE, "using FAST_BILINEAR C scaler for horizontal scaling\n");

  1104.             else

  1105.                 av_log(c, AV_LOG_VERBOSE, "using C scaler for horizontal scaling\n");

  1106. #endif

  1107.         }

  1108.         if (isPlanarYUV(dstFormat)) {

  1109.             if (c->vLumFilterSize==1)

  1110.                 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1111.             else

  1112.                 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (YV12 like)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1113.         } else {

  1114.             if (c->vLumFilterSize==1 && c->vChrFilterSize==2)

  1115.                 av_log(c, AV_LOG_VERBOSE, "using 1-tap %s \"scaler\" for vertical luminance scaling (BGR)\n"

  1116.                        "      2-tap scaler for vertical chrominance scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1117.             else if (c->vLumFilterSize==2 && c->vChrFilterSize==2)

  1118.                 av_log(c, AV_LOG_VERBOSE, "using 2-tap linear %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1119.             else

  1120.                 av_log(c, AV_LOG_VERBOSE, "using n-tap %s scaler for vertical scaling (BGR)\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1121.         }

  1122. 

  1123.         if (dstFormat==PIX_FMT_BGR24)

  1124.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR24 converter\n",

  1125.                    (flags & SWS_CPU_CAPS_MMX2) ? "MMX2" : ((flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C"));

  1126.         else if (dstFormat==PIX_FMT_RGB32)

  1127.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR32 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1128.         else if (dstFormat==PIX_FMT_BGR565)

  1129.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR16 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1130.         else if (dstFormat==PIX_FMT_BGR555)

  1131.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR15 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1132.         else if (dstFormat == PIX_FMT_RGB444BE || dstFormat == PIX_FMT_RGB444LE ||

  1133.                  dstFormat == PIX_FMT_BGR444BE || dstFormat == PIX_FMT_BGR444LE)

  1134.             av_log(c, AV_LOG_VERBOSE, "using %s YV12->BGR12 converter\n", (flags & SWS_CPU_CAPS_MMX) ? "MMX" : "C");

  1135. 

  1136.         av_log(c, AV_LOG_VERBOSE, "%dx%d -> %dx%d\n", srcW, srcH, dstW, dstH);

  1137.         av_log(c, AV_LOG_DEBUG, "lum srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1138.                c->srcW, c->srcH, c->dstW, c->dstH, c->lumXInc, c->lumYInc);

  1139.         av_log(c, AV_LOG_DEBUG, "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",

  1140.                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH, c->chrXInc, c->chrYInc);

  1141.     }

  1142. 

  1143.     c->swScale= ff_getSwsFunc(c);

  1144.     return 0;

  1145. fail: //FIXME replace things by appropriate error codes

  1146.     return -1;

  1147. }

  1148. 

  1149. SwsContext *sws_getContext(int srcW, int srcH, enum PixelFormat srcFormat,

  1150.                            int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1151.                            SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1152. {

  1153.     SwsContext *c;

  1154. 

  1155.     if(!(c=sws_alloc_context()))

  1156.         return NULL;

  1157. 

  1158.     c->flags= flags;

  1159.     c->srcW= srcW;

  1160.     c->srcH= srcH;

  1161.     c->dstW= dstW;

  1162.     c->dstH= dstH;

  1163.     c->srcRange = handle_jpeg(&srcFormat);

  1164.     c->dstRange = handle_jpeg(&dstFormat);

  1165.     c->srcFormat= srcFormat;

  1166.     c->dstFormat= dstFormat;

  1167. 

  1168.     if (param) {

  1169.         c->param[0] = param[0];

  1170.         c->param[1] = param[1];

  1171.     } else {

  1172.         c->param[0] =

  1173.         c->param[1] = SWS_PARAM_DEFAULT;

  1174.     }

  1175.     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);

  1176. 

  1177.     if(sws_init_context(c, srcFilter, dstFilter) < 0){

  1178.         sws_freeContext(c);

  1179.         return NULL;

  1180.     }

  1181. 

  1182.     return c;

  1183. }

  1184. 

  1185. SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,

  1186.                                 float lumaSharpen, float chromaSharpen,

  1187.                                 float chromaHShift, float chromaVShift,

  1188.                                 int verbose)

  1189. {

  1190.     SwsFilter *filter= av_malloc(sizeof(SwsFilter));

  1191.     if (!filter)

  1192.         return NULL;

  1193. 

  1194.     if (lumaGBlur!=0.0) {

  1195.         filter->lumH= sws_getGaussianVec(lumaGBlur, 3.0);

  1196.         filter->lumV= sws_getGaussianVec(lumaGBlur, 3.0);

  1197.     } else {

  1198.         filter->lumH= sws_getIdentityVec();

  1199.         filter->lumV= sws_getIdentityVec();

  1200.     }

  1201. 

  1202.     if (chromaGBlur!=0.0) {

  1203.         filter->chrH= sws_getGaussianVec(chromaGBlur, 3.0);

  1204.         filter->chrV= sws_getGaussianVec(chromaGBlur, 3.0);

  1205.     } else {

  1206.         filter->chrH= sws_getIdentityVec();

  1207.         filter->chrV= sws_getIdentityVec();

  1208.     }

  1209. 

  1210.     if (chromaSharpen!=0.0) {

  1211.         SwsVector *id= sws_getIdentityVec();

  1212.         sws_scaleVec(filter->chrH, -chromaSharpen);

  1213.         sws_scaleVec(filter->chrV, -chromaSharpen);

  1214.         sws_addVec(filter->chrH, id);

  1215.         sws_addVec(filter->chrV, id);

  1216.         sws_freeVec(id);

  1217.     }

  1218. 

  1219.     if (lumaSharpen!=0.0) {

  1220.         SwsVector *id= sws_getIdentityVec();

  1221.         sws_scaleVec(filter->lumH, -lumaSharpen);

  1222.         sws_scaleVec(filter->lumV, -lumaSharpen);

  1223.         sws_addVec(filter->lumH, id);

  1224.         sws_addVec(filter->lumV, id);

  1225.         sws_freeVec(id);

  1226.     }

  1227. 

  1228.     if (chromaHShift != 0.0)

  1229.         sws_shiftVec(filter->chrH, (int)(chromaHShift+0.5));

  1230. 

  1231.     if (chromaVShift != 0.0)

  1232.         sws_shiftVec(filter->chrV, (int)(chromaVShift+0.5));

  1233. 

  1234.     sws_normalizeVec(filter->chrH, 1.0);

  1235.     sws_normalizeVec(filter->chrV, 1.0);

  1236.     sws_normalizeVec(filter->lumH, 1.0);

  1237.     sws_normalizeVec(filter->lumV, 1.0);

  1238. 

  1239.     if (verbose) sws_printVec2(filter->chrH, NULL, AV_LOG_DEBUG);

  1240.     if (verbose) sws_printVec2(filter->lumH, NULL, AV_LOG_DEBUG);

  1241. 

  1242.     return filter;

  1243. }

  1244. 

  1245. SwsVector *sws_allocVec(int length)

  1246. {

  1247.     SwsVector *vec = av_malloc(sizeof(SwsVector));

  1248.     if (!vec)

  1249.         return NULL;

  1250.     vec->length = length;

  1251.     vec->coeff  = av_malloc(sizeof(double) * length);

  1252.     if (!vec->coeff)

  1253.         av_freep(&vec);

  1254.     return vec;

  1255. }

  1256. 

  1257. SwsVector *sws_getGaussianVec(double variance, double quality)

  1258. {

  1259.     const int length= (int)(variance*quality + 0.5) | 1;

  1260.     int i;

  1261.     double middle= (length-1)*0.5;

  1262.     SwsVector *vec= sws_allocVec(length);

  1263. 

  1264.     if (!vec)

  1265.         return NULL;

  1266. 

  1267.     for (i=0; i<length; i++) {

  1268.         double dist= i-middle;

  1269.         vec->coeff[i]= exp(-dist*dist/(2*variance*variance)) / sqrt(2*variance*M_PI);

  1270.     }

  1271. 

  1272.     sws_normalizeVec(vec, 1.0);

  1273. 

  1274.     return vec;

  1275. }

  1276. 

  1277. SwsVector *sws_getConstVec(double c, int length)

  1278. {

  1279.     int i;

  1280.     SwsVector *vec= sws_allocVec(length);

  1281. 

  1282.     if (!vec)

  1283.         return NULL;

  1284. 

  1285.     for (i=0; i<length; i++)

  1286.         vec->coeff[i]= c;

  1287. 

  1288.     return vec;

  1289. }

  1290. 

  1291. SwsVector *sws_getIdentityVec(void)

  1292. {

  1293.     return sws_getConstVec(1.0, 1);

  1294. }

  1295. 

  1296. static double sws_dcVec(SwsVector *a)

  1297. {

  1298.     int i;

  1299.     double sum=0;

  1300. 

  1301.     for (i=0; i<a->length; i++)

  1302.         sum+= a->coeff[i];

  1303. 

  1304.     return sum;

  1305. }

  1306. 

  1307. void sws_scaleVec(SwsVector *a, double scalar)

  1308. {

  1309.     int i;

  1310. 

  1311.     for (i=0; i<a->length; i++)

  1312.         a->coeff[i]*= scalar;

  1313. }

  1314. 

  1315. void sws_normalizeVec(SwsVector *a, double height)

  1316. {

  1317.     sws_scaleVec(a, height/sws_dcVec(a));

  1318. }

  1319. 

  1320. static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)

  1321. {

  1322.     int length= a->length + b->length - 1;

  1323.     int i, j;

  1324.     SwsVector *vec= sws_getConstVec(0.0, length);

  1325. 

  1326.     if (!vec)

  1327.         return NULL;

  1328. 

  1329.     for (i=0; i<a->length; i++) {

  1330.         for (j=0; j<b->length; j++) {

  1331.             vec->coeff[i+j]+= a->coeff[i]*b->coeff[j];

  1332.         }

  1333.     }

  1334. 

  1335.     return vec;

  1336. }

  1337. 

  1338. static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)

  1339. {

  1340.     int length= FFMAX(a->length, b->length);

  1341.     int i;

  1342.     SwsVector *vec= sws_getConstVec(0.0, length);

  1343. 

  1344.     if (!vec)

  1345.         return NULL;

  1346. 

  1347.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1348.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]+= b->coeff[i];

  1349. 

  1350.     return vec;

  1351. }

  1352. 

  1353. static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)

  1354. {

  1355.     int length= FFMAX(a->length, b->length);

  1356.     int i;

  1357.     SwsVector *vec= sws_getConstVec(0.0, length);

  1358. 

  1359.     if (!vec)

  1360.         return NULL;

  1361. 

  1362.     for (i=0; i<a->length; i++) vec->coeff[i + (length-1)/2 - (a->length-1)/2]+= a->coeff[i];

  1363.     for (i=0; i<b->length; i++) vec->coeff[i + (length-1)/2 - (b->length-1)/2]-= b->coeff[i];

  1364. 

  1365.     return vec;

  1366. }

  1367. 

  1368. /* shift left / or right if "shift" is negative */

  1369. static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)

  1370. {

  1371.     int length= a->length + FFABS(shift)*2;

  1372.     int i;

  1373.     SwsVector *vec= sws_getConstVec(0.0, length);

  1374. 

  1375.     if (!vec)

  1376.         return NULL;

  1377. 

  1378.     for (i=0; i<a->length; i++) {

  1379.         vec->coeff[i + (length-1)/2 - (a->length-1)/2 - shift]= a->coeff[i];

  1380.     }

  1381. 

  1382.     return vec;

  1383. }

  1384. 

  1385. void sws_shiftVec(SwsVector *a, int shift)

  1386. {

  1387.     SwsVector *shifted= sws_getShiftedVec(a, shift);

  1388.     av_free(a->coeff);

  1389.     a->coeff= shifted->coeff;

  1390.     a->length= shifted->length;

  1391.     av_free(shifted);

  1392. }

  1393. 

  1394. void sws_addVec(SwsVector *a, SwsVector *b)

  1395. {

  1396.     SwsVector *sum= sws_sumVec(a, b);

  1397.     av_free(a->coeff);

  1398.     a->coeff= sum->coeff;

  1399.     a->length= sum->length;

  1400.     av_free(sum);

  1401. }

  1402. 

  1403. void sws_subVec(SwsVector *a, SwsVector *b)

  1404. {

  1405.     SwsVector *diff= sws_diffVec(a, b);

  1406.     av_free(a->coeff);

  1407.     a->coeff= diff->coeff;

  1408.     a->length= diff->length;

  1409.     av_free(diff);

  1410. }

  1411. 

  1412. void sws_convVec(SwsVector *a, SwsVector *b)

  1413. {

  1414.     SwsVector *conv= sws_getConvVec(a, b);

  1415.     av_free(a->coeff);

  1416.     a->coeff= conv->coeff;

  1417.     a->length= conv->length;

  1418.     av_free(conv);

  1419. }

  1420. 

  1421. SwsVector *sws_cloneVec(SwsVector *a)

  1422. {

  1423.     int i;

  1424.     SwsVector *vec= sws_allocVec(a->length);

  1425. 

  1426.     if (!vec)

  1427.         return NULL;

  1428. 

  1429.     for (i=0; i<a->length; i++) vec->coeff[i]= a->coeff[i];

  1430. 

  1431.     return vec;

  1432. }

  1433. 

  1434. void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)

  1435. {

  1436.     int i;

  1437.     double max=0;

  1438.     double min=0;

  1439.     double range;

  1440. 

  1441.     for (i=0; i<a->length; i++)

  1442.         if (a->coeff[i]>max) max= a->coeff[i];

  1443. 

  1444.     for (i=0; i<a->length; i++)

  1445.         if (a->coeff[i]<min) min= a->coeff[i];

  1446. 

  1447.     range= max - min;

  1448. 

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

  1450.         int x= (int)((a->coeff[i]-min)*60.0/range +0.5);

  1451.         av_log(log_ctx, log_level, "%1.3f ", a->coeff[i]);

  1452.         for (;x>0; x--) av_log(log_ctx, log_level, " ");

  1453.         av_log(log_ctx, log_level, "|\n");

  1454.     }

  1455. }

  1456. 

  1457. #if LIBSWSCALE_VERSION_MAJOR < 1

  1458. void sws_printVec(SwsVector *a)

  1459. {

  1460.     sws_printVec2(a, NULL, AV_LOG_DEBUG);

  1461. }

  1462. #endif

  1463. 

  1464. void sws_freeVec(SwsVector *a)

  1465. {

  1466.     if (!a) return;

  1467.     av_freep(&a->coeff);

  1468.     a->length=0;

  1469.     av_free(a);

  1470. }

  1471. 

  1472. void sws_freeFilter(SwsFilter *filter)

  1473. {

  1474.     if (!filter) return;

  1475. 

  1476.     if (filter->lumH) sws_freeVec(filter->lumH);

  1477.     if (filter->lumV) sws_freeVec(filter->lumV);

  1478.     if (filter->chrH) sws_freeVec(filter->chrH);

  1479.     if (filter->chrV) sws_freeVec(filter->chrV);

  1480.     av_free(filter);

  1481. }

  1482. 

  1483. void sws_freeContext(SwsContext *c)

  1484. {

  1485.     int i;

  1486.     if (!c) return;

  1487. 

  1488.     if (c->lumPixBuf) {

  1489.         for (i=0; i<c->vLumBufSize; i++)

  1490.             av_freep(&c->lumPixBuf[i]);

  1491.         av_freep(&c->lumPixBuf);

  1492.     }

  1493. 

  1494.     if (c->chrPixBuf) {

  1495.         for (i=0; i<c->vChrBufSize; i++)

  1496.             av_freep(&c->chrPixBuf[i]);

  1497.         av_freep(&c->chrPixBuf);

  1498.     }

  1499. 

  1500.     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

  1501.         for (i=0; i<c->vLumBufSize; i++)

  1502.             av_freep(&c->alpPixBuf[i]);

  1503.         av_freep(&c->alpPixBuf);

  1504.     }

  1505. 

  1506.     av_freep(&c->vLumFilter);

  1507.     av_freep(&c->vChrFilter);

  1508.     av_freep(&c->hLumFilter);

  1509.     av_freep(&c->hChrFilter);

  1510. #if HAVE_ALTIVEC

  1511.     av_freep(&c->vYCoeffsBank);

  1512.     av_freep(&c->vCCoeffsBank);

  1513. #endif

  1514. 

  1515.     av_freep(&c->vLumFilterPos);

  1516.     av_freep(&c->vChrFilterPos);

  1517.     av_freep(&c->hLumFilterPos);

  1518.     av_freep(&c->hChrFilterPos);

  1519. 

  1520. #if ARCH_X86

  1521. #ifdef MAP_ANONYMOUS

  1522.     if (c->lumMmx2FilterCode) munmap(c->lumMmx2FilterCode, c->lumMmx2FilterCodeSize);

  1523.     if (c->chrMmx2FilterCode) munmap(c->chrMmx2FilterCode, c->chrMmx2FilterCodeSize);

  1524. #elif HAVE_VIRTUALALLOC

  1525.     if (c->lumMmx2FilterCode) VirtualFree(c->lumMmx2FilterCode, 0, MEM_RELEASE);

  1526.     if (c->chrMmx2FilterCode) VirtualFree(c->chrMmx2FilterCode, 0, MEM_RELEASE);

  1527. #else

  1528.     av_free(c->lumMmx2FilterCode);

  1529.     av_free(c->chrMmx2FilterCode);

  1530. #endif

  1531.     c->lumMmx2FilterCode=NULL;

  1532.     c->chrMmx2FilterCode=NULL;

  1533. #endif /* ARCH_X86 */

  1534. 

  1535.     av_freep(&c->yuvTable);

  1536. 

  1537.     av_free(c);

  1538. }

  1539. 

  1540. struct SwsContext *sws_getCachedContext(struct SwsContext *context,

  1541.                                         int srcW, int srcH, enum PixelFormat srcFormat,

  1542.                                         int dstW, int dstH, enum PixelFormat dstFormat, int flags,

  1543.                                         SwsFilter *srcFilter, SwsFilter *dstFilter, const double *param)

  1544. {

  1545.     static const double default_param[2] = {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT};

  1546. 

  1547.     if (!param)

  1548.         param = default_param;

  1549. 

  1550.     flags = update_flags_cpu(flags);

  1551. 

  1552.     if (context &&

  1553.         (context->srcW      != srcW      ||

  1554.          context->srcH      != srcH      ||

  1555.          context->srcFormat != srcFormat ||

  1556.          context->dstW      != dstW      ||

  1557.          context->dstH      != dstH      ||

  1558.          context->dstFormat != dstFormat ||

  1559.          context->flags     != flags     ||

  1560.          context->param[0]  != param[0]  ||

  1561.          context->param[1]  != param[1])) {

  1562.         sws_freeContext(context);

  1563.         context = NULL;

  1564.     }

  1565. 

  1566.     if (!context) {

  1567.         return sws_getContext(srcW, srcH, srcFormat,

  1568.                               dstW, dstH, dstFormat, flags,

  1569.                               srcFilter, dstFilter, param);

  1570.     }

  1571.     return context;

  1572. }