/*
  * Copyright (C) 2001-2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *

  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.

  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software

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

 #include "config.h"
 
 #define _SVID_SOURCE // needed for MAP_ANONYMOUS

 #define _DARWIN_C_SOURCE // needed for MAP_ANON

 #include <inttypes.h>
 #include <math.h>
 #include <stdio.h>

 #include <string.h>

 #if HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #if defined(MAP_ANON) && !defined(MAP_ANONYMOUS)
 #define MAP_ANONYMOUS MAP_ANON
 #endif
 #endif
 #if HAVE_VIRTUALALLOC
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #endif

 #include "libavutil/attributes.h"

 #include "libavutil/avassert.h"

 #include "libavutil/avutil.h"
 #include "libavutil/bswap.h"

 #include "libavutil/cpu.h"
 #include "libavutil/intreadwrite.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/opt.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/x86/asm.h"

 #include "libavutil/x86/cpu.h"

 #include "rgb2rgb.h"
 #include "swscale.h"
 #include "swscale_internal.h"

 
 unsigned swscale_version(void)
 {

     av_assert0(LIBSWSCALE_VERSION_MICRO >= 100);

     return LIBSWSCALE_VERSION_INT;
 }
 
 const char *swscale_configuration(void)
 {

     return FFMPEG_CONFIGURATION;

 }
 
 const char *swscale_license(void)
 {
 #define LICENSE_PREFIX "libswscale license: "

     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;

 }
 

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

 typedef struct FormatEntry {

     int is_supported_in, is_supported_out;

 } FormatEntry;
 

 static const FormatEntry format_entries[AV_PIX_FMT_NB] = {
     [AV_PIX_FMT_YUV420P]     = { 1, 1 },
     [AV_PIX_FMT_YUYV422]     = { 1, 1 },
     [AV_PIX_FMT_RGB24]       = { 1, 1 },
     [AV_PIX_FMT_BGR24]       = { 1, 1 },
     [AV_PIX_FMT_YUV422P]     = { 1, 1 },
     [AV_PIX_FMT_YUV444P]     = { 1, 1 },
     [AV_PIX_FMT_YUV410P]     = { 1, 1 },
     [AV_PIX_FMT_YUV411P]     = { 1, 1 },
     [AV_PIX_FMT_GRAY8]       = { 1, 1 },
     [AV_PIX_FMT_MONOWHITE]   = { 1, 1 },
     [AV_PIX_FMT_MONOBLACK]   = { 1, 1 },
     [AV_PIX_FMT_PAL8]        = { 1, 0 },
     [AV_PIX_FMT_YUVJ420P]    = { 1, 1 },
     [AV_PIX_FMT_YUVJ422P]    = { 1, 1 },
     [AV_PIX_FMT_YUVJ444P]    = { 1, 1 },
     [AV_PIX_FMT_UYVY422]     = { 1, 1 },
     [AV_PIX_FMT_UYYVYY411]   = { 0, 0 },
     [AV_PIX_FMT_BGR8]        = { 1, 1 },
     [AV_PIX_FMT_BGR4]        = { 0, 1 },
     [AV_PIX_FMT_BGR4_BYTE]   = { 1, 1 },
     [AV_PIX_FMT_RGB8]        = { 1, 1 },
     [AV_PIX_FMT_RGB4]        = { 0, 1 },
     [AV_PIX_FMT_RGB4_BYTE]   = { 1, 1 },
     [AV_PIX_FMT_NV12]        = { 1, 1 },
     [AV_PIX_FMT_NV21]        = { 1, 1 },
     [AV_PIX_FMT_ARGB]        = { 1, 1 },
     [AV_PIX_FMT_RGBA]        = { 1, 1 },
     [AV_PIX_FMT_ABGR]        = { 1, 1 },
     [AV_PIX_FMT_BGRA]        = { 1, 1 },

     [AV_PIX_FMT_0RGB]        = { 1, 1 },
     [AV_PIX_FMT_RGB0]        = { 1, 1 },
     [AV_PIX_FMT_0BGR]        = { 1, 1 },
     [AV_PIX_FMT_BGR0]        = { 1, 1 },

     [AV_PIX_FMT_GRAY16BE]    = { 1, 1 },
     [AV_PIX_FMT_GRAY16LE]    = { 1, 1 },
     [AV_PIX_FMT_YUV440P]     = { 1, 1 },
     [AV_PIX_FMT_YUVJ440P]    = { 1, 1 },
     [AV_PIX_FMT_YUVA420P]    = { 1, 1 },

     [AV_PIX_FMT_YUVA422P]    = { 1, 1 },
     [AV_PIX_FMT_YUVA444P]    = { 1, 1 },

     [AV_PIX_FMT_YUVA420P9BE] = { 1, 1 },
     [AV_PIX_FMT_YUVA420P9LE] = { 1, 1 },
     [AV_PIX_FMT_YUVA422P9BE] = { 1, 1 },
     [AV_PIX_FMT_YUVA422P9LE] = { 1, 1 },
     [AV_PIX_FMT_YUVA444P9BE] = { 1, 1 },
     [AV_PIX_FMT_YUVA444P9LE] = { 1, 1 },
     [AV_PIX_FMT_YUVA420P10BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA420P10LE]= { 1, 1 },
     [AV_PIX_FMT_YUVA422P10BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA422P10LE]= { 1, 1 },
     [AV_PIX_FMT_YUVA444P10BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA444P10LE]= { 1, 1 },
     [AV_PIX_FMT_YUVA420P16BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA420P16LE]= { 1, 1 },
     [AV_PIX_FMT_YUVA422P16BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA422P16LE]= { 1, 1 },
     [AV_PIX_FMT_YUVA444P16BE]= { 1, 1 },
     [AV_PIX_FMT_YUVA444P16LE]= { 1, 1 },

     [AV_PIX_FMT_RGB48BE]     = { 1, 1 },
     [AV_PIX_FMT_RGB48LE]     = { 1, 1 },

     [AV_PIX_FMT_RGBA64BE]    = { 1, 0 },
     [AV_PIX_FMT_RGBA64LE]    = { 1, 0 },

     [AV_PIX_FMT_RGB565BE]    = { 1, 1 },
     [AV_PIX_FMT_RGB565LE]    = { 1, 1 },
     [AV_PIX_FMT_RGB555BE]    = { 1, 1 },
     [AV_PIX_FMT_RGB555LE]    = { 1, 1 },
     [AV_PIX_FMT_BGR565BE]    = { 1, 1 },
     [AV_PIX_FMT_BGR565LE]    = { 1, 1 },
     [AV_PIX_FMT_BGR555BE]    = { 1, 1 },
     [AV_PIX_FMT_BGR555LE]    = { 1, 1 },
     [AV_PIX_FMT_YUV420P16LE] = { 1, 1 },
     [AV_PIX_FMT_YUV420P16BE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P16LE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P16BE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P16LE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P16BE] = { 1, 1 },
     [AV_PIX_FMT_RGB444LE]    = { 1, 1 },
     [AV_PIX_FMT_RGB444BE]    = { 1, 1 },
     [AV_PIX_FMT_BGR444LE]    = { 1, 1 },
     [AV_PIX_FMT_BGR444BE]    = { 1, 1 },
     [AV_PIX_FMT_Y400A]       = { 1, 0 },
     [AV_PIX_FMT_BGR48BE]     = { 1, 1 },
     [AV_PIX_FMT_BGR48LE]     = { 1, 1 },

     [AV_PIX_FMT_BGRA64BE]    = { 0, 0 },
     [AV_PIX_FMT_BGRA64LE]    = { 0, 0 },

     [AV_PIX_FMT_YUV420P9BE]  = { 1, 1 },
     [AV_PIX_FMT_YUV420P9LE]  = { 1, 1 },
     [AV_PIX_FMT_YUV420P10BE] = { 1, 1 },
     [AV_PIX_FMT_YUV420P10LE] = { 1, 1 },

     [AV_PIX_FMT_YUV420P12BE] = { 1, 1 },
     [AV_PIX_FMT_YUV420P12LE] = { 1, 1 },
     [AV_PIX_FMT_YUV420P14BE] = { 1, 1 },
     [AV_PIX_FMT_YUV420P14LE] = { 1, 1 },

     [AV_PIX_FMT_YUV422P9BE]  = { 1, 1 },
     [AV_PIX_FMT_YUV422P9LE]  = { 1, 1 },
     [AV_PIX_FMT_YUV422P10BE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P10LE] = { 1, 1 },

     [AV_PIX_FMT_YUV422P12BE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P12LE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P14BE] = { 1, 1 },
     [AV_PIX_FMT_YUV422P14LE] = { 1, 1 },

     [AV_PIX_FMT_YUV444P9BE]  = { 1, 1 },
     [AV_PIX_FMT_YUV444P9LE]  = { 1, 1 },
     [AV_PIX_FMT_YUV444P10BE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P10LE] = { 1, 1 },

     [AV_PIX_FMT_YUV444P12BE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P12LE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P14BE] = { 1, 1 },
     [AV_PIX_FMT_YUV444P14LE] = { 1, 1 },

     [AV_PIX_FMT_GBRP]        = { 1, 0 },
     [AV_PIX_FMT_GBRP9LE]     = { 1, 0 },
     [AV_PIX_FMT_GBRP9BE]     = { 1, 0 },
     [AV_PIX_FMT_GBRP10LE]    = { 1, 0 },
     [AV_PIX_FMT_GBRP10BE]    = { 1, 0 },

     [AV_PIX_FMT_GBRP12LE]    = { 1, 0 },
     [AV_PIX_FMT_GBRP12BE]    = { 1, 0 },
     [AV_PIX_FMT_GBRP14LE]    = { 1, 0 },
     [AV_PIX_FMT_GBRP14BE]    = { 1, 0 },

     [AV_PIX_FMT_GBRP16LE]    = { 1, 0 },
     [AV_PIX_FMT_GBRP16BE]    = { 1, 0 },

 };
 

 int sws_isSupportedInput(enum AVPixelFormat pix_fmt)

 {

     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

            format_entries[pix_fmt].is_supported_in : 0;

 }
 

 int sws_isSupportedOutput(enum AVPixelFormat pix_fmt)

 {

     return (unsigned)pix_fmt < AV_PIX_FMT_NB ?

            format_entries[pix_fmt].is_supported_out : 0;

 }
 
 extern const int32_t ff_yuv2rgb_coeffs[8][4];
 

 #if FF_API_SWS_FORMAT_NAME

 const char *sws_format_name(enum AVPixelFormat format)

 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
     if (desc)
         return desc->name;

     else
         return "Unknown format";

 }
 #endif
 

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

 {

     if (dist <= 1.0)
         return ((d * dist + c) * dist + b) * dist + a;
     else
         return getSplineCoeff(0.0,
                                b + 2.0 * c + 3.0 * d,
                                c + 3.0 * d,
                               -b - 3.0 * c - 6.0 * d,
                               dist - 1.0);

 }
 

 static int initFilter(int16_t **outFilter, int32_t **filterPos,
                       int *outFilterSize, int xInc, int srcW, int dstW,
                       int filterAlign, int one, int flags, int cpu_flags,
                       SwsVector *srcFilter, SwsVector *dstFilter,

                       double param[2])

 {
     int i;
     int filterSize;
     int filter2Size;
     int minFilterSize;

     int64_t *filter    = NULL;
     int64_t *filter2   = NULL;

     const int64_t fone = 1LL << (54 - FFMIN(av_log2(srcW/dstW), 8));

     int ret            = -1;

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

     // NOTE: the +3 is for the MMX(+1) / SSE(+3) scaler which reads over the end
     FF_ALLOC_OR_GOTO(NULL, *filterPos, (dstW + 3) * sizeof(**filterPos), fail);

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

         int i;

         filterSize = 1;
         FF_ALLOCZ_OR_GOTO(NULL, filter,
                           dstW * sizeof(*filter) * filterSize, fail);

         for (i = 0; i < dstW; i++) {
             filter[i * filterSize] = fone;
             (*filterPos)[i]        = i;

         }

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

         int i;

         int64_t xDstInSrc;

         filterSize = 1;
         FF_ALLOC_OR_GOTO(NULL, filter,
                          dstW * sizeof(*filter) * filterSize, fail);

         xDstInSrc = xInc / 2 - 0x8000;
         for (i = 0; i < dstW; i++) {
             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

             (*filterPos)[i] = xx;
             filter[i]       = fone;
             xDstInSrc      += xInc;

         }

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

         int i;

         int64_t xDstInSrc;

         filterSize = 2;
         FF_ALLOC_OR_GOTO(NULL, filter,
                          dstW * sizeof(*filter) * filterSize, fail);

         xDstInSrc = xInc / 2 - 0x8000;
         for (i = 0; i < dstW; i++) {
             int xx = (xDstInSrc - ((filterSize - 1) << 15) + (1 << 15)) >> 16;

             int j;
 

             (*filterPos)[i] = xx;
             // bilinear upscale / linear interpolate / area averaging
             for (j = 0; j < filterSize; j++) {

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

                 if (coeff < 0)
                     coeff = 0;
                 filter[i * filterSize + j] = coeff;

                 xx++;
             }

             xDstInSrc += xInc;

         }
     } else {

         int64_t xDstInSrc;

         int sizeFactor;
 

         if (flags & SWS_BICUBIC)
             sizeFactor = 4;
         else if (flags & SWS_X)
             sizeFactor = 8;
         else if (flags & SWS_AREA)
             sizeFactor = 1;     // downscale only, for upscale it is bilinear
         else if (flags & SWS_GAUSS)
             sizeFactor = 8;     // infinite ;)
         else if (flags & SWS_LANCZOS)
             sizeFactor = param[0] != SWS_PARAM_DEFAULT ? ceil(2 * param[0]) : 6;
         else if (flags & SWS_SINC)
             sizeFactor = 20;    // infinite ;)
         else if (flags & SWS_SPLINE)
             sizeFactor = 20;    // infinite ;)
         else if (flags & SWS_BILINEAR)
             sizeFactor = 2;

         else {

             av_assert0(0);

         }
 

         if (xInc <= 1 << 16)
             filterSize = 1 + sizeFactor;    // upscale
         else
             filterSize = 1 + (sizeFactor * srcW + dstW - 1) / dstW;

         filterSize = FFMIN(filterSize, srcW - 2);
         filterSize = FFMAX(filterSize, 1);

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

         xDstInSrc = xInc - 0x10000;
         for (i = 0; i < dstW; i++) {

             int xx = (xDstInSrc - ((int64_t)(filterSize - 2) << 16)) / (1 << 17);

             int j;

             (*filterPos)[i] = xx;
             for (j = 0; j < filterSize; j++) {
                 int64_t d = (FFABS(((int64_t)xx << 17) - xDstInSrc)) << 13;

                 double floatd;
                 int64_t coeff;
 

                 if (xInc > 1 << 16)
                     d = d * dstW / srcW;
                 floatd = d * (1.0 / (1 << 30));

 
                 if (flags & SWS_BICUBIC) {

                     int64_t B = (param[0] != SWS_PARAM_DEFAULT ? param[0] :   0) * (1 << 24);
                     int64_t C = (param[1] != SWS_PARAM_DEFAULT ? param[1] : 0.6) * (1 << 24);

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

                         coeff = 0.0;
                     } else {
                         int64_t dd  = (d  * d) >> 30;
                         int64_t ddd = (dd * d) >> 30;
 

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

                         else

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

                     }

                     coeff /= (1LL<<54)/fone;

                 }

 #if 0
                 else if (flags & SWS_X) {
                     double p  = param ? param * 0.01 : 0.3;
                     coeff     = d ? sin(d * M_PI) / (d * M_PI) : 1.0;
                     coeff    *= pow(2.0, -p * d * d);

                 }

 #endif

                 else if (flags & SWS_X) {

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

                     double c;
 

                     if (floatd < 1.0)
                         c = cos(floatd * M_PI);

                     else

                         c = -1.0;
                     if (c < 0.0)
                         c = -pow(-c, A);

                     else

                         c = pow(c, A);
                     coeff = (c * 0.5 + 0.5) * fone;

                 } else if (flags & SWS_AREA) {

                     int64_t d2 = d - (1 << 29);
                     if (d2 * xInc < -(1LL << (29 + 16)))
                         coeff = 1.0 * (1LL << (30 + 16));
                     else if (d2 * xInc < (1LL << (29 + 16)))
                         coeff = -d2 * xInc + (1LL << (29 + 16));
                     else
                         coeff = 0.0;
                     coeff *= fone >> (30 + 16);

                 } else if (flags & SWS_GAUSS) {

                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                     coeff = (pow(2.0, -p * floatd * floatd)) * fone;

                 } else if (flags & SWS_SINC) {

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

                 } else if (flags & SWS_LANCZOS) {

                     double p = param[0] != SWS_PARAM_DEFAULT ? param[0] : 3.0;
                     coeff = (d ? sin(floatd * M_PI) * sin(floatd * M_PI / p) /
                              (floatd * floatd * M_PI * M_PI / p) : 1.0) * fone;
                     if (floatd > p)
                         coeff = 0;

                 } else if (flags & SWS_BILINEAR) {

                     coeff = (1 << 30) - d;
                     if (coeff < 0)
                         coeff = 0;

                     coeff *= fone >> 30;
                 } else if (flags & SWS_SPLINE) {

                     double p = -2.196152422706632;
                     coeff = getSplineCoeff(1.0, 0.0, p, -p - 1.0, floatd) * fone;

                 } else {

                     av_assert0(0);

                 }
 

                 filter[i * filterSize + j] = coeff;

                 xx++;
             }

             xDstInSrc += 2 * xInc;

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

      * av_free(filter);
      */

     av_assert0(filterSize > 0);

     filter2Size = filterSize;
     if (srcFilter)
         filter2Size += srcFilter->length - 1;
     if (dstFilter)
         filter2Size += dstFilter->length - 1;

     av_assert0(filter2Size > 0);

     FF_ALLOCZ_OR_GOTO(NULL, filter2, filter2Size * dstW * sizeof(*filter2), fail);
 
     for (i = 0; i < dstW; i++) {

         int j, k;
 

         if (srcFilter) {
             for (k = 0; k < srcFilter->length; k++) {
                 for (j = 0; j < filterSize; j++)
                     filter2[i * filter2Size + k + j] +=
                         srcFilter->coeff[k] * filter[i * filterSize + j];

             }
         } else {

             for (j = 0; j < filterSize; j++)
                 filter2[i * filter2Size + j] = filter[i * filterSize + j];

         }

         // FIXME dstFilter

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

     }
     av_freep(&filter);
 
     /* try to reduce the filter-size (step1 find size and shift left) */
     // Assume it is near normalized (*0.5 or *2.0 is OK but * 0.001 is not).

     minFilterSize = 0;
     for (i = dstW - 1; i >= 0; i--) {
         int min = filter2Size;

         int j;

         int64_t cutOff = 0.0;

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

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

             int k;

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

             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
                 break;

             /* preserve monotonicity because the core can't handle the
              * filter otherwise */
             if (i < dstW - 1 && (*filterPos)[i] >= (*filterPos)[i + 1])
                 break;

 
             // move filter coefficients left

             for (k = 1; k < filter2Size; k++)
                 filter2[i * filter2Size + k - 1] = filter2[i * filter2Size + k];
             filter2[i * filter2Size + k - 1] = 0;

             (*filterPos)[i]++;
         }
 

         cutOff = 0;

         /* count near zeros on the right */

         for (j = filter2Size - 1; j > 0; j--) {
             cutOff += FFABS(filter2[i * filter2Size + j]);

             if (cutOff > SWS_MAX_REDUCE_CUTOFF * fone)
                 break;

             min--;
         }
 

         if (min > minFilterSize)
             minFilterSize = min;

     }
 

     if (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) {

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

         if (minFilterSize < 5)
             filterAlign = 4;
 

         /* We really don't want to waste our time doing useless computation, so
          * fall back on the scalar C code for very small filters.
          * Vectorizing is worth it only if you have a decent-sized vector. */

         if (minFilterSize < 3)
             filterAlign = 1;
     }
 

     if (INLINE_MMX(cpu_flags)) {

         // special case for unscaled vertical filtering
         if (minFilterSize == 1 && filterAlign == 2)

             filterAlign = 1;

     }
 

     av_assert0(minFilterSize > 0);

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

     av_assert0(filterSize > 0);

     filter = av_malloc(filterSize * dstW * sizeof(*filter));
     if (filterSize >= MAX_FILTER_SIZE * 16 /

                       ((flags & SWS_ACCURATE_RND) ? APCK_SIZE : 16) || !filter) {
         av_log(NULL, AV_LOG_ERROR, "sws: filterSize %d is too large, try less extreem scaling or increase MAX_FILTER_SIZE and recompile\n", filterSize);

         goto fail;

     }

     *outFilterSize = filterSize;

     if (flags & SWS_PRINT_INFO)
         av_log(NULL, AV_LOG_VERBOSE,
                "SwScaler: reducing / aligning filtersize %d -> %d\n",
                filter2Size, filterSize);

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

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

         int j;
 

         for (j = 0; j < filterSize; j++) {
             if (j >= filter2Size)
                 filter[i * filterSize + j] = 0;
             else
                 filter[i * filterSize + j] = filter2[i * filter2Size + j];
             if ((flags & SWS_BITEXACT) && j >= minFilterSize)
                 filter[i * filterSize + j] = 0;

         }
     }
 

     // FIXME try to align filterPos if possible

     // fix borders

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

         int j;
         if ((*filterPos)[i] < 0) {
             // move filter coefficients left to compensate for filterPos

             for (j = 1; j < filterSize; j++) {
                 int left = FFMAX(j + (*filterPos)[i], 0);
                 filter[i * filterSize + left] += filter[i * filterSize + j];
                 filter[i * filterSize + j]     = 0;

             }
             (*filterPos)[i]= 0;
         }
 
         if ((*filterPos)[i] + filterSize > srcW) {

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

             // move filter coefficients right to compensate for filterPos

             for (j = filterSize - 2; j >= 0; j--) {
                 int right = FFMIN(j + shift, filterSize - 1);
                 filter[i * filterSize + right] += filter[i * filterSize + j];
                 filter[i * filterSize + j]      = 0;

             }
             (*filterPos)[i]= srcW - filterSize;
         }
     }
 
     // Note the +1 is for the MMX scaler which reads over the end
     /* align at 16 for AltiVec (needed by hScale_altivec_real) */

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

 
     /* normalize & store in outFilter */

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

         int j;

         int64_t error = 0;
         int64_t sum   = 0;

         for (j = 0; j < filterSize; j++) {
             sum += filter[i * filterSize + j];

         }

         sum = (sum + one / 2) / one;
         for (j = 0; j < *outFilterSize; j++) {
             int64_t v = filter[i * filterSize + j] + error;
             int intV  = ROUNDED_DIV(v, sum);
             (*outFilter)[i * (*outFilterSize) + j] = intV;
             error                                  = v - intV * sum;

         }
     }
 

     (*filterPos)[dstW + 0] =
     (*filterPos)[dstW + 1] =
     (*filterPos)[dstW + 2] = (*filterPos)[dstW - 1]; /* the MMX/SSE scaler will
                                                       * read over the end */
     for (i = 0; i < *outFilterSize; i++) {
         int k = (dstW - 1) * (*outFilterSize) + i;

         (*outFilter)[k + 1 * (*outFilterSize)] =
         (*outFilter)[k + 2 * (*outFilterSize)] =
         (*outFilter)[k + 3 * (*outFilterSize)] = (*outFilter)[k];

     }
 

     ret = 0;
 

 fail:

     if(ret < 0)
         av_log(NULL, AV_LOG_ERROR, "sws: initFilter failed\n");

     av_free(filter);
     av_free(filter2);
     return ret;
 }
 

 #if HAVE_MMXEXT_INLINE

 static int init_hscaler_mmxext(int dstW, int xInc, uint8_t *filterCode,
                                int16_t *filter, int32_t *filterPos,
                                int numSplits)

 {
     uint8_t *fragmentA;
     x86_reg imm8OfPShufW1A;
     x86_reg imm8OfPShufW2A;
     x86_reg fragmentLengthA;
     uint8_t *fragmentB;
     x86_reg imm8OfPShufW1B;
     x86_reg imm8OfPShufW2B;
     x86_reg fragmentLengthB;
     int fragmentPos;
 
     int xpos, i;
 
     // create an optimized horizontal scaling routine

     /* This scaler is made of runtime-generated MMXEXT code using specially tuned

      * pshufw instructions. For every four output pixels, if four input pixels
      * are enough for the fast bilinear scaling, then a chunk of fragmentB is
      * used. If five input pixels are needed, then a chunk of fragmentA is used.

      */
 

     // code fragment

     __asm__ volatile (

         "jmp                         9f                 \n\t"

         // Begin

         "0:                                             \n\t"
         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"
         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"
         "movd   1(%%"REG_c", %%"REG_S"), %%mm1          \n\t"
         "punpcklbw                %%mm7, %%mm1          \n\t"
         "punpcklbw                %%mm7, %%mm0          \n\t"
         "pshufw                   $0xFF, %%mm1, %%mm1   \n\t"
         "1:                                             \n\t"
         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"
         "2:                                             \n\t"
         "psubw                    %%mm1, %%mm0          \n\t"
         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"
         "pmullw                   %%mm3, %%mm0          \n\t"
         "psllw                       $7, %%mm1          \n\t"
         "paddw                    %%mm1, %%mm0          \n\t"
 
         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"
 
         "add                         $8, %%"REG_a"      \n\t"

         // End

         "9:                                             \n\t"

         // "int $3                                         \n\t"
         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"
         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"
         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

         "dec                         %1                 \n\t"
         "dec                         %2                 \n\t"
         "sub                         %0, %1             \n\t"
         "sub                         %0, %2             \n\t"

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

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

         : "=r" (fragmentA), "=r" (imm8OfPShufW1A), "=r" (imm8OfPShufW2A),
           "=r" (fragmentLengthA)
         );

     __asm__ volatile (

         "jmp                         9f                 \n\t"

         // Begin

         "0:                                             \n\t"
         "movq    (%%"REG_d", %%"REG_a"), %%mm3          \n\t"
         "movd    (%%"REG_c", %%"REG_S"), %%mm0          \n\t"
         "punpcklbw                %%mm7, %%mm0          \n\t"
         "pshufw                   $0xFF, %%mm0, %%mm1   \n\t"
         "1:                                             \n\t"
         "pshufw                   $0xFF, %%mm0, %%mm0   \n\t"
         "2:                                             \n\t"
         "psubw                    %%mm1, %%mm0          \n\t"
         "movl   8(%%"REG_b", %%"REG_a"), %%esi          \n\t"
         "pmullw                   %%mm3, %%mm0          \n\t"
         "psllw                       $7, %%mm1          \n\t"
         "paddw                    %%mm1, %%mm0          \n\t"
 
         "movq                     %%mm0, (%%"REG_D", %%"REG_a") \n\t"
 
         "add                         $8, %%"REG_a"      \n\t"

         // End

         "9:                                             \n\t"

         // "int                       $3                   \n\t"
         "lea       " LOCAL_MANGLE(0b) ", %0             \n\t"
         "lea       " LOCAL_MANGLE(1b) ", %1             \n\t"
         "lea       " LOCAL_MANGLE(2b) ", %2             \n\t"

         "dec                         %1                 \n\t"
         "dec                         %2                 \n\t"
         "sub                         %0, %1             \n\t"
         "sub                         %0, %2             \n\t"

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

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

         : "=r" (fragmentB), "=r" (imm8OfPShufW1B), "=r" (imm8OfPShufW2B),
           "=r" (fragmentLengthB)
         );

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

     for (i = 0; i < dstW / numSplits; i++) {
         int xx = xpos >> 16;

         if ((i & 3) == 0) {
             int a                  = 0;
             int b                  = ((xpos + xInc) >> 16) - xx;
             int c                  = ((xpos + xInc * 2) >> 16) - xx;
             int d                  = ((xpos + xInc * 3) >> 16) - xx;
             int inc                = (d + 1 < 4);
             uint8_t *fragment      = (d + 1 < 4) ? fragmentB : fragmentA;
             x86_reg imm8OfPShufW1  = (d + 1 < 4) ? imm8OfPShufW1B : imm8OfPShufW1A;
             x86_reg imm8OfPShufW2  = (d + 1 < 4) ? imm8OfPShufW2B : imm8OfPShufW2A;
             x86_reg fragmentLength = (d + 1 < 4) ? fragmentLengthB : fragmentLengthA;
             int maxShift           = 3 - (d + inc);
             int shift              = 0;

 
             if (filterCode) {

                 filter[i]        = ((xpos              & 0xFFFF) ^ 0xFFFF) >> 9;
                 filter[i + 1]    = (((xpos + xInc)     & 0xFFFF) ^ 0xFFFF) >> 9;
                 filter[i + 2]    = (((xpos + xInc * 2) & 0xFFFF) ^ 0xFFFF) >> 9;
                 filter[i + 3]    = (((xpos + xInc * 3) & 0xFFFF) ^ 0xFFFF) >> 9;
                 filterPos[i / 2] = xx;

 
                 memcpy(filterCode + fragmentPos, fragment, fragmentLength);
 

                 filterCode[fragmentPos + imm8OfPShufW1] =  (a + inc)       |
                                                           ((b + inc) << 2) |
                                                           ((c + inc) << 4) |
                                                           ((d + inc) << 6);
                 filterCode[fragmentPos + imm8OfPShufW2] =  a | (b << 2) |
                                                                (c << 4) |
                                                                (d << 6);
 
                 if (i + 4 - inc >= dstW)
                     shift = maxShift;               // avoid overread
                 else if ((filterPos[i / 2] & 3) <= maxShift)
                     shift = filterPos[i / 2] & 3;   // align
 
                 if (shift && i >= shift) {
                     filterCode[fragmentPos + imm8OfPShufW1] += 0x55 * shift;
                     filterCode[fragmentPos + imm8OfPShufW2] += 0x55 * shift;
                     filterPos[i / 2]                        -= shift;

                 }
             }
 

             fragmentPos += fragmentLength;

 
             if (filterCode)

                 filterCode[fragmentPos] = RET;

         }

         xpos += xInc;

     }
     if (filterCode)

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

 
     return fragmentPos + 1;
 }

 #endif /* HAVE_MMXEXT_INLINE */

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

 {

     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
     *h = desc->log2_chroma_w;
     *v = desc->log2_chroma_h;

 }
 

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

 {

     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);
     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);

     memcpy(c->srcColorspaceTable, inv_table, sizeof(int) * 4);
     memcpy(c->dstColorspaceTable, table, sizeof(int) * 4);

     if(!isYUV(c->dstFormat) && !isGray(c->dstFormat))
         dstRange = 0;
     if(!isYUV(c->srcFormat) && !isGray(c->srcFormat))
         srcRange = 0;
 

     c->brightness = brightness;
     c->contrast   = contrast;
     c->saturation = saturation;
     c->srcRange   = srcRange;
     c->dstRange   = dstRange;

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

     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

     ff_yuv2rgb_c_init_tables(c, inv_table, srcRange, brightness,
                              contrast, saturation);
     // FIXME factorize

     if (HAVE_ALTIVEC && av_get_cpu_flags() & AV_CPU_FLAG_ALTIVEC)

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

     return 0;
 }
 

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

 {

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

         return -1;

     *inv_table  = c->srcColorspaceTable;
     *table      = c->dstColorspaceTable;
     *srcRange   = c->srcRange;
     *dstRange   = c->dstRange;
     *brightness = c->brightness;
     *contrast   = c->contrast;
     *saturation = c->saturation;

 
     return 0;
 }
 

 static int handle_jpeg(enum AVPixelFormat *format)

 {
     switch (*format) {

     case AV_PIX_FMT_YUVJ420P:
         *format = AV_PIX_FMT_YUV420P;

         return 1;

     case AV_PIX_FMT_YUVJ422P:
         *format = AV_PIX_FMT_YUV422P;

         return 1;

     case AV_PIX_FMT_YUVJ444P:
         *format = AV_PIX_FMT_YUV444P;

         return 1;

     case AV_PIX_FMT_YUVJ440P:
         *format = AV_PIX_FMT_YUV440P;

         return 1;
     default:
         return 0;

     }
 }
 

 static int handle_0alpha(enum AVPixelFormat *format)

 {
     switch (*format) {

     case AV_PIX_FMT_0BGR    : *format = AV_PIX_FMT_ABGR   ; return 1;
     case AV_PIX_FMT_BGR0    : *format = AV_PIX_FMT_BGRA   ; return 4;
     case AV_PIX_FMT_0RGB    : *format = AV_PIX_FMT_ARGB   ; return 1;
     case AV_PIX_FMT_RGB0    : *format = AV_PIX_FMT_RGBA   ; return 4;

     default:                                          return 0;

     }
 }
 

 SwsContext *sws_alloc_context(void)
 {

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

     if (c) {
         c->av_class = &sws_context_class;
         av_opt_set_defaults(c);
     }

 
     return c;
 }
 

 av_cold int sws_init_context(SwsContext *c, SwsFilter *srcFilter,
                              SwsFilter *dstFilter)

 {

     int i, j;

     int usesVFilter, usesHFilter;
     int unscaled;

     SwsFilter dummyFilter = { NULL, NULL, NULL, NULL };
     int srcW              = c->srcW;
     int srcH              = c->srcH;
     int dstW              = c->dstW;
     int dstH              = c->dstH;

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

     int flags, cpu_flags;

     enum AVPixelFormat srcFormat = c->srcFormat;
     enum AVPixelFormat dstFormat = c->dstFormat;

     const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(srcFormat);
     const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(dstFormat);

     cpu_flags = av_get_cpu_flags();
     flags     = c->flags;

     emms_c();

     if (!rgb15to16)
         sws_rgb2rgb_init();

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

     handle_jpeg(&srcFormat);
     handle_jpeg(&dstFormat);

     handle_0alpha(&srcFormat);
     handle_0alpha(&dstFormat);

 
     if(srcFormat!=c->srcFormat || dstFormat!=c->dstFormat){
         av_log(c, AV_LOG_WARNING, "deprecated pixel format used, make sure you did set range correctly\n");
         c->srcFormat= srcFormat;
         c->dstFormat= dstFormat;
     }
 

     if (!sws_isSupportedInput(srcFormat)) {

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

                av_get_pix_fmt_name(srcFormat));

         return AVERROR(EINVAL);

     }

     if (!sws_isSupportedOutput(dstFormat)) {

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

                av_get_pix_fmt_name(dstFormat));

         return AVERROR(EINVAL);

     }
 

     i = flags & (SWS_POINT         |
                  SWS_AREA          |
                  SWS_BILINEAR      |
                  SWS_FAST_BILINEAR |
                  SWS_BICUBIC       |
                  SWS_X             |
                  SWS_GAUSS         |
                  SWS_LANCZOS       |
                  SWS_SINC          |
                  SWS_SPLINE        |
                  SWS_BICUBLIN);
     if (!i || (i & (i - 1))) {

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

         return AVERROR(EINVAL);

     }
     /* sanity check */

     if (srcW < 1 || srcH < 1 || dstW < 1 || dstH < 1) {

         /* FIXME check if these are enough and try to lower them after
          * fixing the relevant parts of the code */

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

                srcW, srcH, dstW, dstH);

         return AVERROR(EINVAL);

     }
 

     if (!dstFilter)
         dstFilter = &dummyFilter;
     if (!srcFilter)
         srcFilter = &dummyFilter;

     c->lumXInc      = (((int64_t)srcW << 16) + (dstW >> 1)) / dstW;
     c->lumYInc      = (((int64_t)srcH << 16) + (dstH >> 1)) / dstH;

     c->dstFormatBpp = av_get_bits_per_pixel(desc_dst);
     c->srcFormatBpp = av_get_bits_per_pixel(desc_src);

     c->vRounder     = 4 * 0x0001000100010001ULL;

     usesVFilter = (srcFilter->lumV && srcFilter->lumV->length > 1) ||
                   (srcFilter->chrV && srcFilter->chrV->length > 1) ||
                   (dstFilter->lumV && dstFilter->lumV->length > 1) ||
                   (dstFilter->chrV && dstFilter->chrV->length > 1);
     usesHFilter = (srcFilter->lumH && srcFilter->lumH->length > 1) ||
                   (srcFilter->chrH && srcFilter->chrH->length > 1) ||
                   (dstFilter->lumH && dstFilter->lumH->length > 1) ||
                   (dstFilter->chrH && dstFilter->chrH->length > 1);

 
     getSubSampleFactors(&c->chrSrcHSubSample, &c->chrSrcVSubSample, srcFormat);
     getSubSampleFactors(&c->chrDstHSubSample, &c->chrDstVSubSample, dstFormat);
 

     if (isAnyRGB(dstFormat) && !(flags&SWS_FULL_CHR_H_INT)) {
         if (dstW&1) {
             av_log(c, AV_LOG_DEBUG, "Forcing full internal H chroma due to odd output size\n");
             flags |= SWS_FULL_CHR_H_INT;
             c->flags = flags;

         }
     }

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

     if (flags & SWS_FULL_CHR_H_INT &&

         isAnyRGB(dstFormat)        &&

         dstFormat != AV_PIX_FMT_RGBA  &&
         dstFormat != AV_PIX_FMT_ARGB  &&
         dstFormat != AV_PIX_FMT_BGRA  &&
         dstFormat != AV_PIX_FMT_ABGR  &&
         dstFormat != AV_PIX_FMT_RGB24 &&
         dstFormat != AV_PIX_FMT_BGR24) {

         av_log(c, AV_LOG_WARNING,
                "full chroma interpolation for destination format '%s' not yet implemented\n",

                av_get_pix_fmt_name(dstFormat));

         flags   &= ~SWS_FULL_CHR_H_INT;

         c->flags = flags;

     }

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

 
     // drop some chroma lines if the user wants it

     c->vChrDrop          = (flags & SWS_SRC_V_CHR_DROP_MASK) >>
                            SWS_SRC_V_CHR_DROP_SHIFT;
     c->chrSrcVSubSample += c->vChrDrop;
 
     /* drop every other pixel for chroma calculation unless user
      * wants full chroma */
     if (isAnyRGB(srcFormat) && !(flags & SWS_FULL_CHR_H_INP)   &&

         srcFormat != AV_PIX_FMT_RGB8 && srcFormat != AV_PIX_FMT_BGR8 &&
         srcFormat != AV_PIX_FMT_RGB4 && srcFormat != AV_PIX_FMT_BGR4 &&
         srcFormat != AV_PIX_FMT_RGB4_BYTE && srcFormat != AV_PIX_FMT_BGR4_BYTE &&

         ((dstW >> c->chrDstHSubSample) <= (srcW >> 1) ||
          (flags & SWS_FAST_BILINEAR)))
         c->chrSrcHSubSample = 1;

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

     c->chrSrcW = -((-srcW) >> c->chrSrcHSubSample);
     c->chrSrcH = -((-srcH) >> c->chrSrcVSubSample);
     c->chrDstW = -((-dstW) >> c->chrDstHSubSample);
     c->chrDstH = -((-dstH) >> c->chrDstVSubSample);

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

     /* unscaled special cases */

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

         ff_get_unscaled_swscale(c);
 
         if (c->swScale) {

             if (flags & SWS_PRINT_INFO)
                 av_log(c, AV_LOG_INFO,
                        "using unscaled %s -> %s special converter\n",

                        av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));

             return 0;

         }
     }
 

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

     if (c->srcBpc < 8)
         c->srcBpc = 8;

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

     if (c->dstBpc < 8)
         c->dstBpc = 8;

     if (isAnyRGB(srcFormat) || srcFormat == AV_PIX_FMT_PAL8)

         c->srcBpc = 16;

     if (c->dstBpc == 16)

         dst_stride <<= 1;

     if (INLINE_MMXEXT(cpu_flags) && c->srcBpc == 8 && c->dstBpc <= 14) {

         c->canMMXEXTBeUsed = (dstW >= srcW && (dstW & 31) == 0 &&
                               (srcW & 15) == 0) ? 1 : 0;
         if (!c->canMMXEXTBeUsed && dstW >= srcW && (srcW & 15) == 0

             && (flags & SWS_FAST_BILINEAR)) {
             if (flags & SWS_PRINT_INFO)
                 av_log(c, AV_LOG_INFO,

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

         }

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

             c->canMMXEXTBeUsed = 0;

     } else

         c->canMMXEXTBeUsed = 0;

 
     c->chrXInc = (((int64_t)c->chrSrcW << 16) + (c->chrDstW >> 1)) / c->chrDstW;
     c->chrYInc = (((int64_t)c->chrSrcH << 16) + (c->chrDstH >> 1)) / c->chrDstH;
 
     /* Match pixel 0 of the src to pixel 0 of dst and match pixel n-2 of src
      * to pixel n-2 of dst, but only for the FAST_BILINEAR mode otherwise do
      * correct scaling.
      * n-2 is the last chrominance sample available.
      * This is not perfect, but no one should notice the difference, the more
      * correct variant would be like the vertical one, but that would require
      * some special code for the first and last pixel */
     if (flags & SWS_FAST_BILINEAR) {

         if (c->canMMXEXTBeUsed) {

             c->lumXInc += 20;
             c->chrXInc += 20;

         }

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

         else if (INLINE_MMX(cpu_flags) && c->dstBpc <= 14) {

             c->lumXInc = ((int64_t)(srcW       - 2) << 16) / (dstW       - 2) - 20;
             c->chrXInc = ((int64_t)(c->chrSrcW - 2) << 16) / (c->chrDstW - 2) - 20;

         }
     }
 

 #define USE_MMAP (HAVE_MMAP && HAVE_MPROTECT && defined MAP_ANONYMOUS)
 

     /* precalculate horizontal scaler filter coefficients */
     {

 #if HAVE_MMXEXT_INLINE

 // can't downscale !!!

         if (c->canMMXEXTBeUsed && (flags & SWS_FAST_BILINEAR)) {

             c->lumMmxextFilterCodeSize = init_hscaler_mmxext(dstW, c->lumXInc, NULL,
                                                              NULL, NULL, 8);
             c->chrMmxextFilterCodeSize = init_hscaler_mmxext(c->chrDstW, c->chrXInc,
                                                              NULL, NULL, NULL, 4);

 #if USE_MMAP

             c->lumMmxextFilterCode = mmap(NULL, c->lumMmxextFilterCodeSize,
                                           PROT_READ | PROT_WRITE,
                                           MAP_PRIVATE | MAP_ANONYMOUS,
                                           -1, 0);
             c->chrMmxextFilterCode = mmap(NULL, c->chrMmxextFilterCodeSize,
                                           PROT_READ | PROT_WRITE,
                                           MAP_PRIVATE | MAP_ANONYMOUS,
                                           -1, 0);

 #elif HAVE_VIRTUALALLOC

             c->lumMmxextFilterCode = VirtualAlloc(NULL,
                                                   c->lumMmxextFilterCodeSize,
                                                   MEM_COMMIT,
                                                   PAGE_EXECUTE_READWRITE);
             c->chrMmxextFilterCode = VirtualAlloc(NULL,
                                                   c->chrMmxextFilterCodeSize,
                                                   MEM_COMMIT,
                                                   PAGE_EXECUTE_READWRITE);

 #else

             c->lumMmxextFilterCode = av_malloc(c->lumMmxextFilterCodeSize);
             c->chrMmxextFilterCode = av_malloc(c->chrMmxextFilterCodeSize);

 #endif
 

 #ifdef MAP_ANONYMOUS

             if (c->lumMmxextFilterCode == MAP_FAILED || c->chrMmxextFilterCode == MAP_FAILED)

 #else

             if (!c->lumMmxextFilterCode || !c->chrMmxextFilterCode)

 #endif

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

                 return AVERROR(ENOMEM);

             }

             FF_ALLOCZ_OR_GOTO(c, c->hLumFilter,    (dstW           / 8 + 8) * sizeof(int16_t), fail);
             FF_ALLOCZ_OR_GOTO(c, c->hChrFilter,    (c->chrDstW     / 4 + 8) * sizeof(int16_t), fail);
             FF_ALLOCZ_OR_GOTO(c, c->hLumFilterPos, (dstW       / 2 / 8 + 8) * sizeof(int32_t), fail);
             FF_ALLOCZ_OR_GOTO(c, c->hChrFilterPos, (c->chrDstW / 2 / 4 + 8) * sizeof(int32_t), fail);

             init_hscaler_mmxext(      dstW, c->lumXInc, c->lumMmxextFilterCode,
                                 c->hLumFilter, (uint32_t*)c->hLumFilterPos, 8);

             init_hscaler_mmxext(c->chrDstW, c->chrXInc, c->chrMmxextFilterCode,

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

 #if USE_MMAP

             mprotect(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize, PROT_EXEC | PROT_READ);
             mprotect(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize, PROT_EXEC | PROT_READ);

 #endif
         } else

 #endif /* HAVE_MMXEXT_INLINE */

         {

             const int filterAlign =
                 (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 4 :

                 (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

                 1;
 

             if (initFilter(&c->hLumFilter, &c->hLumFilterPos,
                            &c->hLumFilterSize, c->lumXInc,
                            srcW, dstW, filterAlign, 1 << 14,
                            (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
                            cpu_flags, srcFilter->lumH, dstFilter->lumH,

                            c->param) < 0)

                 goto fail;

             if (initFilter(&c->hChrFilter, &c->hChrFilterPos,
                            &c->hChrFilterSize, c->chrXInc,
                            c->chrSrcW, c->chrDstW, filterAlign, 1 << 14,
                            (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
                            cpu_flags, srcFilter->chrH, dstFilter->chrH,

                            c->param) < 0)

                 goto fail;
         }
     } // initialize horizontal stuff
 
     /* precalculate vertical scaler filter coefficients */
     {

         const int filterAlign =
             (HAVE_MMX && cpu_flags & AV_CPU_FLAG_MMX) ? 2 :

             (HAVE_ALTIVEC && cpu_flags & AV_CPU_FLAG_ALTIVEC) ? 8 :

             1;
 

         if (initFilter(&c->vLumFilter, &c->vLumFilterPos, &c->vLumFilterSize,
                        c->lumYInc, srcH, dstH, filterAlign, (1 << 12),
                        (flags & SWS_BICUBLIN) ? (flags | SWS_BICUBIC) : flags,
                        cpu_flags, srcFilter->lumV, dstFilter->lumV,

                        c->param) < 0)

             goto fail;

         if (initFilter(&c->vChrFilter, &c->vChrFilterPos, &c->vChrFilterSize,
                        c->chrYInc, c->chrSrcH, c->chrDstH,
                        filterAlign, (1 << 12),
                        (flags & SWS_BICUBLIN) ? (flags | SWS_BILINEAR) : flags,
                        cpu_flags, srcFilter->chrV, dstFilter->chrV,

                        c->param) < 0)

             goto fail;
 

 #if HAVE_ALTIVEC

         FF_ALLOC_OR_GOTO(c, c->vYCoeffsBank, sizeof(vector signed short) * c->vLumFilterSize * c->dstH,    fail);
         FF_ALLOC_OR_GOTO(c, c->vCCoeffsBank, sizeof(vector signed short) * c->vChrFilterSize * c->chrDstH, fail);

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

             int j;
             short *p = (short *)&c->vYCoeffsBank[i];

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

                 p[j] = c->vLumFilter[i];
         }
 

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

             int j;
             short *p = (short *)&c->vCCoeffsBank[i];

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

                 p[j] = c->vChrFilter[i];
         }
 #endif
     }
 
     // calculate buffer sizes so that they won't run out while handling these damn slices

     c->vLumBufSize = c->vLumFilterSize;
     c->vChrBufSize = c->vChrFilterSize;
     for (i = 0; i < dstH; i++) {
         int chrI      = (int64_t)i * c->chrDstH / dstH;
         int nextSlice = FFMAX(c->vLumFilterPos[i] + c->vLumFilterSize - 1,
                               ((c->vChrFilterPos[chrI] + c->vChrFilterSize - 1)
                                << c->chrSrcVSubSample));
 
         nextSlice >>= c->chrSrcVSubSample;
         nextSlice <<= c->chrSrcVSubSample;
         if (c->vLumFilterPos[i] + c->vLumBufSize < nextSlice)
             c->vLumBufSize = nextSlice - c->vLumFilterPos[i];
         if (c->vChrFilterPos[chrI] + c->vChrBufSize <
             (nextSlice >> c->chrSrcVSubSample))
             c->vChrBufSize = (nextSlice >> c->chrSrcVSubSample) -
                              c->vChrFilterPos[chrI];

     }
 

     /* Allocate pixbufs (we use dynamic allocation because otherwise we would
      * need to allocate several megabytes to handle all possible cases) */
     FF_ALLOC_OR_GOTO(c, c->lumPixBuf,  c->vLumBufSize * 3 * sizeof(int16_t *), fail);
     FF_ALLOC_OR_GOTO(c, c->chrUPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);
     FF_ALLOC_OR_GOTO(c, c->chrVPixBuf, c->vChrBufSize * 3 * sizeof(int16_t *), fail);

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

         FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf, c->vLumBufSize * 3 * sizeof(int16_t *), fail);
     /* Note we need at least one pixel more at the end because of the MMX code
      * (just in case someone wants to replace the 4000/8000). */

     /* align at 16 bytes for AltiVec */

     for (i = 0; i < c->vLumBufSize; i++) {
         FF_ALLOCZ_OR_GOTO(c, c->lumPixBuf[i + c->vLumBufSize],
                           dst_stride + 16, fail);
         c->lumPixBuf[i] = c->lumPixBuf[i + c->vLumBufSize];

     }

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

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

     c->uv_offx2 = dst_stride + 16;

     for (i = 0; i < c->vChrBufSize; i++) {
         FF_ALLOC_OR_GOTO(c, c->chrUPixBuf[i + c->vChrBufSize],
                          dst_stride * 2 + 32, fail);
         c->chrUPixBuf[i] = c->chrUPixBuf[i + c->vChrBufSize];
         c->chrVPixBuf[i] = c->chrVPixBuf[i + c->vChrBufSize]
                          = c->chrUPixBuf[i] + (dst_stride >> 1) + 8;

     }
     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf)

         for (i = 0; i < c->vLumBufSize; i++) {
             FF_ALLOCZ_OR_GOTO(c, c->alpPixBuf[i + c->vLumBufSize],
                               dst_stride + 16, fail);
             c->alpPixBuf[i] = c->alpPixBuf[i + c->vLumBufSize];

         }
 

     // try to avoid drawing green stuff between the right end and the stride end
     for (i = 0; i < c->vChrBufSize; i++)

         if(desc_dst->comp[0].depth_minus1 == 15){

             av_assert0(c->dstBpc > 14);

             for(j=0; j<dst_stride/2+1; j++)
                 ((int32_t*)(c->chrUPixBuf[i]))[j] = 1<<18;
         } else
             for(j=0; j<dst_stride+1; j++)
                 ((int16_t*)(c->chrUPixBuf[i]))[j] = 1<<14;

     av_assert0(c->chrDstH <= dstH);

     if (flags & SWS_PRINT_INFO) {
         if (flags & SWS_FAST_BILINEAR)
             av_log(c, AV_LOG_INFO, "FAST_BILINEAR scaler, ");
         else if (flags & SWS_BILINEAR)
             av_log(c, AV_LOG_INFO, "BILINEAR scaler, ");
         else if (flags & SWS_BICUBIC)
             av_log(c, AV_LOG_INFO, "BICUBIC scaler, ");
         else if (flags & SWS_X)
             av_log(c, AV_LOG_INFO, "Experimental scaler, ");
         else if (flags & SWS_POINT)
             av_log(c, AV_LOG_INFO, "Nearest Neighbor / POINT scaler, ");
         else if (flags & SWS_AREA)
             av_log(c, AV_LOG_INFO, "Area Averaging scaler, ");
         else if (flags & SWS_BICUBLIN)
             av_log(c, AV_LOG_INFO, "luma BICUBIC / chroma BILINEAR scaler, ");
         else if (flags & SWS_GAUSS)
             av_log(c, AV_LOG_INFO, "Gaussian scaler, ");
         else if (flags & SWS_SINC)
             av_log(c, AV_LOG_INFO, "Sinc scaler, ");
         else if (flags & SWS_LANCZOS)
             av_log(c, AV_LOG_INFO, "Lanczos scaler, ");
         else if (flags & SWS_SPLINE)
             av_log(c, AV_LOG_INFO, "Bicubic spline scaler, ");
         else
             av_log(c, AV_LOG_INFO, "ehh flags invalid?! ");

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

                av_get_pix_fmt_name(srcFormat),

 #ifdef DITHER1XBPP

                dstFormat == AV_PIX_FMT_BGR555   || dstFormat == AV_PIX_FMT_BGR565   ||
                dstFormat == AV_PIX_FMT_RGB444BE || dstFormat == AV_PIX_FMT_RGB444LE ||
                dstFormat == AV_PIX_FMT_BGR444BE || dstFormat == AV_PIX_FMT_BGR444LE ?

                                                              "dithered " : "",

 #else
                "",
 #endif

                av_get_pix_fmt_name(dstFormat));

         if (INLINE_MMXEXT(cpu_flags))

             av_log(c, AV_LOG_INFO, "using MMXEXT\n");

         else if (INLINE_AMD3DNOW(cpu_flags))

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

         else if (INLINE_MMX(cpu_flags))

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

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

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

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

         av_log(c, AV_LOG_DEBUG,
                "chr srcW=%d srcH=%d dstW=%d dstH=%d xInc=%d yInc=%d\n",
                c->chrSrcW, c->chrSrcH, c->chrDstW, c->chrDstH,
                c->chrXInc, c->chrYInc);

     }
 

     c->swScale = ff_getSwsFunc(c);

     return 0;

 fail: // FIXME replace things by appropriate error codes

     return -1;
 }

 #if FF_API_SWS_GETCONTEXT

 SwsContext *sws_getContext(int srcW, int srcH, enum AVPixelFormat srcFormat,
                            int dstW, int dstH, enum AVPixelFormat dstFormat,

                            int flags, SwsFilter *srcFilter,
                            SwsFilter *dstFilter, const double *param)

 {
     SwsContext *c;
 

     if (!(c = sws_alloc_context()))

         return NULL;
 

     c->flags     = flags;
     c->srcW      = srcW;
     c->srcH      = srcH;
     c->dstW      = dstW;
     c->dstH      = dstH;
     c->srcRange  = handle_jpeg(&srcFormat);
     c->dstRange  = handle_jpeg(&dstFormat);

     c->src0Alpha = handle_0alpha(&srcFormat);
     c->dst0Alpha = handle_0alpha(&dstFormat);

     c->srcFormat = srcFormat;
     c->dstFormat = dstFormat;

 
     if (param) {
         c->param[0] = param[0];
         c->param[1] = param[1];
     }

     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);

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

         sws_freeContext(c);
         return NULL;
     }
 
     return c;

 }

 #endif

 
 SwsFilter *sws_getDefaultFilter(float lumaGBlur, float chromaGBlur,
                                 float lumaSharpen, float chromaSharpen,
                                 float chromaHShift, float chromaVShift,
                                 int verbose)
 {

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

     if (!filter)
         return NULL;
 

     if (lumaGBlur != 0.0) {
         filter->lumH = sws_getGaussianVec(lumaGBlur, 3.0);
         filter->lumV = sws_getGaussianVec(lumaGBlur, 3.0);

     } else {

         filter->lumH = sws_getIdentityVec();
         filter->lumV = sws_getIdentityVec();

     }
 

     if (chromaGBlur != 0.0) {
         filter->chrH = sws_getGaussianVec(chromaGBlur, 3.0);
         filter->chrV = sws_getGaussianVec(chromaGBlur, 3.0);

     } else {

         filter->chrH = sws_getIdentityVec();
         filter->chrV = sws_getIdentityVec();

     }
 

     if (chromaSharpen != 0.0) {
         SwsVector *id = sws_getIdentityVec();

         sws_scaleVec(filter->chrH, -chromaSharpen);
         sws_scaleVec(filter->chrV, -chromaSharpen);
         sws_addVec(filter->chrH, id);
         sws_addVec(filter->chrV, id);
         sws_freeVec(id);
     }
 

     if (lumaSharpen != 0.0) {
         SwsVector *id = sws_getIdentityVec();

         sws_scaleVec(filter->lumH, -lumaSharpen);
         sws_scaleVec(filter->lumV, -lumaSharpen);
         sws_addVec(filter->lumH, id);
         sws_addVec(filter->lumV, id);
         sws_freeVec(id);
     }
 
     if (chromaHShift != 0.0)

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

 
     if (chromaVShift != 0.0)

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

 
     sws_normalizeVec(filter->chrH, 1.0);
     sws_normalizeVec(filter->chrV, 1.0);
     sws_normalizeVec(filter->lumH, 1.0);
     sws_normalizeVec(filter->lumV, 1.0);
 

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

 
     return filter;
 }
 
 SwsVector *sws_allocVec(int length)
 {

     SwsVector *vec;
 
     if(length <= 0 || length > INT_MAX/ sizeof(double))
         return NULL;
 
     vec = av_malloc(sizeof(SwsVector));

     if (!vec)
         return NULL;
     vec->length = length;
     vec->coeff  = av_malloc(sizeof(double) * length);
     if (!vec->coeff)
         av_freep(&vec);
     return vec;
 }
 
 SwsVector *sws_getGaussianVec(double variance, double quality)
 {

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

     int i;

     double middle  = (length - 1) * 0.5;

     SwsVector *vec;
 
     if(variance < 0 || quality < 0)
         return NULL;
 
     vec = sws_allocVec(length);

 
     if (!vec)
         return NULL;
 

     for (i = 0; i < length; i++) {
         double dist = i - middle;
         vec->coeff[i] = exp(-dist * dist / (2 * variance * variance)) /
                         sqrt(2 * variance * M_PI);

     }
 
     sws_normalizeVec(vec, 1.0);
 
     return vec;
 }
 
 SwsVector *sws_getConstVec(double c, int length)
 {
     int i;

     SwsVector *vec = sws_allocVec(length);

 
     if (!vec)
         return NULL;
 

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

 
     return vec;
 }
 
 SwsVector *sws_getIdentityVec(void)
 {
     return sws_getConstVec(1.0, 1);
 }
 

 static double sws_dcVec(SwsVector *a)

 {
     int i;

     double sum = 0;

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

 
     return sum;
 }
 
 void sws_scaleVec(SwsVector *a, double scalar)
 {
     int i;
 

     for (i = 0; i < a->length; i++)
         a->coeff[i] *= scalar;

 }
 
 void sws_normalizeVec(SwsVector *a, double height)
 {

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

 }
 
 static SwsVector *sws_getConvVec(SwsVector *a, SwsVector *b)
 {

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

     int i, j;

     SwsVector *vec = sws_getConstVec(0.0, length);

 
     if (!vec)
         return NULL;
 

     for (i = 0; i < a->length; i++) {
         for (j = 0; j < b->length; j++) {
             vec->coeff[i + j] += a->coeff[i] * b->coeff[j];

         }
     }
 
     return vec;
 }
 
 static SwsVector *sws_sumVec(SwsVector *a, SwsVector *b)
 {

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

     int i;

     SwsVector *vec = sws_getConstVec(0.0, length);

 
     if (!vec)
         return NULL;
 

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

 
     return vec;
 }
 
 static SwsVector *sws_diffVec(SwsVector *a, SwsVector *b)
 {

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

     int i;

     SwsVector *vec = sws_getConstVec(0.0, length);

 
     if (!vec)
         return NULL;
 

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

 
     return vec;
 }
 
 /* shift left / or right if "shift" is negative */
 static SwsVector *sws_getShiftedVec(SwsVector *a, int shift)
 {

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

     int i;

     SwsVector *vec = sws_getConstVec(0.0, length);

 
     if (!vec)
         return NULL;
 

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

     }
 
     return vec;
 }
 
 void sws_shiftVec(SwsVector *a, int shift)
 {

     SwsVector *shifted = sws_getShiftedVec(a, shift);

     av_free(a->coeff);

     a->coeff  = shifted->coeff;
     a->length = shifted->length;

     av_free(shifted);
 }
 
 void sws_addVec(SwsVector *a, SwsVector *b)
 {

     SwsVector *sum = sws_sumVec(a, b);

     av_free(a->coeff);

     a->coeff  = sum->coeff;
     a->length = sum->length;

     av_free(sum);
 }
 
 void sws_subVec(SwsVector *a, SwsVector *b)
 {

     SwsVector *diff = sws_diffVec(a, b);

     av_free(a->coeff);

     a->coeff  = diff->coeff;
     a->length = diff->length;

     av_free(diff);
 }
 
 void sws_convVec(SwsVector *a, SwsVector *b)
 {

     SwsVector *conv = sws_getConvVec(a, b);

     av_free(a->coeff);

     a->coeff  = conv->coeff;
     a->length = conv->length;

     av_free(conv);
 }
 
 SwsVector *sws_cloneVec(SwsVector *a)
 {
     int i;

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

 
     if (!vec)
         return NULL;
 

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

 
     return vec;
 }
 
 void sws_printVec2(SwsVector *a, AVClass *log_ctx, int log_level)
 {
     int i;

     double max = 0;
     double min = 0;

     double range;
 

     for (i = 0; i < a->length; i++)
         if (a->coeff[i] > max)
             max = a->coeff[i];

     for (i = 0; i < a->length; i++)
         if (a->coeff[i] < min)
             min = a->coeff[i];

     range = max - min;

     for (i = 0; i < a->length; i++) {
         int x = (int)((a->coeff[i] - min) * 60.0 / range + 0.5);

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

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

         av_log(log_ctx, log_level, "|\n");
     }
 }
 
 void sws_freeVec(SwsVector *a)
 {

     if (!a)
         return;

     av_freep(&a->coeff);

     a->length = 0;

     av_free(a);
 }
 
 void sws_freeFilter(SwsFilter *filter)
 {

     if (!filter)
         return;
 
     if (filter->lumH)
         sws_freeVec(filter->lumH);
     if (filter->lumV)
         sws_freeVec(filter->lumV);
     if (filter->chrH)
         sws_freeVec(filter->chrH);
     if (filter->chrV)
         sws_freeVec(filter->chrV);

     av_free(filter);
 }
 
 void sws_freeContext(SwsContext *c)
 {
     int i;

     if (!c)
         return;

 
     if (c->lumPixBuf) {

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

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

     if (c->chrUPixBuf) {

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

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

     }
 
     if (CONFIG_SWSCALE_ALPHA && c->alpPixBuf) {

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

             av_freep(&c->alpPixBuf[i]);
         av_freep(&c->alpPixBuf);
     }
 
     av_freep(&c->vLumFilter);
     av_freep(&c->vChrFilter);
     av_freep(&c->hLumFilter);
     av_freep(&c->hChrFilter);

 #if HAVE_ALTIVEC

     av_freep(&c->vYCoeffsBank);
     av_freep(&c->vCCoeffsBank);
 #endif
 
     av_freep(&c->vLumFilterPos);
     av_freep(&c->vChrFilterPos);
     av_freep(&c->hLumFilterPos);
     av_freep(&c->hChrFilterPos);
 

 #if HAVE_MMX_INLINE

 #if USE_MMAP

     if (c->lumMmxextFilterCode)
         munmap(c->lumMmxextFilterCode, c->lumMmxextFilterCodeSize);
     if (c->chrMmxextFilterCode)
         munmap(c->chrMmxextFilterCode, c->chrMmxextFilterCodeSize);

 #elif HAVE_VIRTUALALLOC

     if (c->lumMmxextFilterCode)
         VirtualFree(c->lumMmxextFilterCode, 0, MEM_RELEASE);
     if (c->chrMmxextFilterCode)
         VirtualFree(c->chrMmxextFilterCode, 0, MEM_RELEASE);

 #else

     av_free(c->lumMmxextFilterCode);
     av_free(c->chrMmxextFilterCode);

 #endif

     c->lumMmxextFilterCode = NULL;
     c->chrMmxextFilterCode = NULL;

 #endif /* HAVE_MMX_INLINE */

 
     av_freep(&c->yuvTable);

     av_freep(&c->formatConvBuffer);

 
     av_free(c);
 }
 

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

                                         int srcH, enum AVPixelFormat srcFormat,

                                         int dstW, int dstH,

                                         enum AVPixelFormat dstFormat, int flags,

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

 {

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

 
     if (!param)
         param = default_param;
 

     if (context &&

         (context->srcW      != srcW      ||
          context->srcH      != srcH      ||
          context->srcFormat != srcFormat ||
          context->dstW      != dstW      ||
          context->dstH      != dstH      ||
          context->dstFormat != dstFormat ||
          context->flags     != flags     ||
          context->param[0]  != param[0]  ||

          context->param[1]  != param[1])) {
         sws_freeContext(context);
         context = NULL;
     }

     if (!context) {

         if (!(context = sws_alloc_context()))
             return NULL;
         context->srcW      = srcW;
         context->srcH      = srcH;

         context->srcRange  = handle_jpeg(&srcFormat);

         context->src0Alpha = handle_0alpha(&srcFormat);

         context->srcFormat = srcFormat;

         context->dstW      = dstW;
         context->dstH      = dstH;

         context->dstRange  = handle_jpeg(&dstFormat);

         context->dst0Alpha = handle_0alpha(&dstFormat);

         context->dstFormat = dstFormat;
         context->flags     = flags;
         context->param[0]  = param[0];
         context->param[1]  = param[1];

         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);

         if (sws_init_context(context, srcFilter, dstFilter) < 0) {
             sws_freeContext(context);
             return NULL;
         }

     }
     return context;
 }