text: /*
   * Copyright (C) 2001-2011 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 <inttypes.h>
  #include <string.h>
  #include <math.h>
  #include <stdio.h>
  #include "config.h"
  #include "swscale.h"
  #include "swscale_internal.h"
  #include "rgb2rgb.h"
  #include "libavutil/intreadwrite.h"
  #include "libavutil/cpu.h"
  #include "libavutil/avutil.h"
  #include "libavutil/mathematics.h"
  #include "libavutil/bswap.h"
  #include "libavutil/pixdesc.h"
  #include "libavutil/avassert.h"
  
  DECLARE_ALIGNED(8, const uint8_t, dithers)[8][8][8]={
  {
    {   0,  1,  0,  1,  0,  1,  0,  1,},
    {   1,  0,  1,  0,  1,  0,  1,  0,},
    {   0,  1,  0,  1,  0,  1,  0,  1,},
    {   1,  0,  1,  0,  1,  0,  1,  0,},
    {   0,  1,  0,  1,  0,  1,  0,  1,},
    {   1,  0,  1,  0,  1,  0,  1,  0,},
    {   0,  1,  0,  1,  0,  1,  0,  1,},
    {   1,  0,  1,  0,  1,  0,  1,  0,},
  },{
    {   1,  2,  1,  2,  1,  2,  1,  2,},
    {   3,  0,  3,  0,  3,  0,  3,  0,},
    {   1,  2,  1,  2,  1,  2,  1,  2,},
    {   3,  0,  3,  0,  3,  0,  3,  0,},
    {   1,  2,  1,  2,  1,  2,  1,  2,},
    {   3,  0,  3,  0,  3,  0,  3,  0,},
    {   1,  2,  1,  2,  1,  2,  1,  2,},
    {   3,  0,  3,  0,  3,  0,  3,  0,},
  },{
    {   2,  4,  3,  5,  2,  4,  3,  5,},
    {   6,  0,  7,  1,  6,  0,  7,  1,},
    {   3,  5,  2,  4,  3,  5,  2,  4,},
    {   7,  1,  6,  0,  7,  1,  6,  0,},
    {   2,  4,  3,  5,  2,  4,  3,  5,},
    {   6,  0,  7,  1,  6,  0,  7,  1,},
    {   3,  5,  2,  4,  3,  5,  2,  4,},
    {   7,  1,  6,  0,  7,  1,  6,  0,},
  },{
    {   4,  8,  7, 11,  4,  8,  7, 11,},
    {  12,  0, 15,  3, 12,  0, 15,  3,},
    {   6, 10,  5,  9,  6, 10,  5,  9,},
    {  14,  2, 13,  1, 14,  2, 13,  1,},
    {   4,  8,  7, 11,  4,  8,  7, 11,},
    {  12,  0, 15,  3, 12,  0, 15,  3,},
    {   6, 10,  5,  9,  6, 10,  5,  9,},
    {  14,  2, 13,  1, 14,  2, 13,  1,},
  },{
    {   9, 17, 15, 23,  8, 16, 14, 22,},
    {  25,  1, 31,  7, 24,  0, 30,  6,},
    {  13, 21, 11, 19, 12, 20, 10, 18,},
    {  29,  5, 27,  3, 28,  4, 26,  2,},
    {   8, 16, 14, 22,  9, 17, 15, 23,},
    {  24,  0, 30,  6, 25,  1, 31,  7,},
    {  12, 20, 10, 18, 13, 21, 11, 19,},
    {  28,  4, 26,  2, 29,  5, 27,  3,},
  },{
    {  18, 34, 30, 46, 17, 33, 29, 45,},
    {  50,  2, 62, 14, 49,  1, 61, 13,},
    {  26, 42, 22, 38, 25, 41, 21, 37,},
    {  58, 10, 54,  6, 57,  9, 53,  5,},
    {  16, 32, 28, 44, 19, 35, 31, 47,},
    {  48,  0, 60, 12, 51,  3, 63, 15,},
    {  24, 40, 20, 36, 27, 43, 23, 39,},
    {  56,  8, 52,  4, 59, 11, 55,  7,},
  },{
    {  18, 34, 30, 46, 17, 33, 29, 45,},
    {  50,  2, 62, 14, 49,  1, 61, 13,},
    {  26, 42, 22, 38, 25, 41, 21, 37,},
    {  58, 10, 54,  6, 57,  9, 53,  5,},
    {  16, 32, 28, 44, 19, 35, 31, 47,},
    {  48,  0, 60, 12, 51,  3, 63, 15,},
    {  24, 40, 20, 36, 27, 43, 23, 39,},
    {  56,  8, 52,  4, 59, 11, 55,  7,},
  },{
    {  36, 68, 60, 92, 34, 66, 58, 90,},
    { 100,  4,124, 28, 98,  2,122, 26,},
    {  52, 84, 44, 76, 50, 82, 42, 74,},
    { 116, 20,108, 12,114, 18,106, 10,},
    {  32, 64, 56, 88, 38, 70, 62, 94,},
    {  96,  0,120, 24,102,  6,126, 30,},
    {  48, 80, 40, 72, 54, 86, 46, 78,},
    { 112, 16,104,  8,118, 22,110, 14,},
  }};
  
  const uint16_t dither_scale[15][16]={
  {    2,    3,    3,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,    5,},
  {    2,    3,    7,    7,   13,   13,   25,   25,   25,   25,   25,   25,   25,   25,   25,   25,},
  {    3,    3,    4,   15,   15,   29,   57,   57,   57,  113,  113,  113,  113,  113,  113,  113,},
  {    3,    4,    4,    5,   31,   31,   61,  121,  241,  241,  241,  241,  481,  481,  481,  481,},
  {    3,    4,    5,    5,    6,   63,   63,  125,  249,  497,  993,  993,  993,  993,  993, 1985,},
  {    3,    5,    6,    6,    6,    7,  127,  127,  253,  505, 1009, 2017, 4033, 4033, 4033, 4033,},
  {    3,    5,    6,    7,    7,    7,    8,  255,  255,  509, 1017, 2033, 4065, 8129,16257,16257,},
  {    3,    5,    6,    8,    8,    8,    8,    9,  511,  511, 1021, 2041, 4081, 8161,16321,32641,},
  {    3,    5,    7,    8,    9,    9,    9,    9,   10, 1023, 1023, 2045, 4089, 8177,16353,32705,},
  {    3,    5,    7,    8,   10,   10,   10,   10,   10,   11, 2047, 2047, 4093, 8185,16369,32737,},
  {    3,    5,    7,    8,   10,   11,   11,   11,   11,   11,   12, 4095, 4095, 8189,16377,32753,},
  {    3,    5,    7,    9,   10,   12,   12,   12,   12,   12,   12,   13, 8191, 8191,16381,32761,},
  {    3,    5,    7,    9,   10,   12,   13,   13,   13,   13,   13,   13,   14,16383,16383,32765,},
  {    3,    5,    7,    9,   10,   12,   14,   14,   14,   14,   14,   14,   14,   15,32767,32767,},
  {    3,    5,    7,    9,   11,   12,   14,   15,   15,   15,   15,   15,   15,   15,   16,65535,},
  };
  
  
  static void fillPlane(uint8_t *plane, int stride, int width, int height, int y,
                        uint8_t val)
  {
      int i;
      uint8_t *ptr = plane + stride * y;
      for (i = 0; i < height; i++) {
          memset(ptr, val, width);
          ptr += stride;
      }
  }
  
  static void copyPlane(const uint8_t *src, int srcStride,
                        int srcSliceY, int srcSliceH, int width,
                        uint8_t *dst, int dstStride)
  {
      dst += dstStride * srcSliceY;
      if (dstStride == srcStride && srcStride > 0) {
          memcpy(dst, src, srcSliceH * dstStride);
      } else {
          int i;
          for (i = 0; i < srcSliceH; i++) {
              memcpy(dst, src, width);
              src += srcStride;
              dst += dstStride;
          }
      }
  }
  
  static int planarToNv12Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY,
                                 int srcSliceH, uint8_t *dstParam[],
                                 int dstStride[])
  {
      uint8_t *dst = dstParam[1] + dstStride[1] * srcSliceY / 2;
  
      copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
                dstParam[0], dstStride[0]);
  
      if (c->dstFormat == AV_PIX_FMT_NV12)
          interleaveBytes(src[1], src[2], dst, c->srcW / 2, srcSliceH / 2,
                          srcStride[1], srcStride[2], dstStride[0]);
      else
          interleaveBytes(src[2], src[1], dst, c->srcW / 2, srcSliceH / 2,
                          srcStride[2], srcStride[1], dstStride[0]);
  
      return srcSliceH;
  }
  
  static int planarToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
  
      yv12toyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
                 srcStride[1], dstStride[0]);
  
      return srcSliceH;
  }
  
  static int planarToUyvyWrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
  
      yv12touyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
                 srcStride[1], dstStride[0]);
  
      return srcSliceH;
  }
  
  static int yuv422pToYuy2Wrapper(SwsContext *c, const uint8_t *src[],
                                  int srcStride[], int srcSliceY, int srcSliceH,
                                  uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
  
      yuv422ptoyuy2(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
                    srcStride[1], dstStride[0]);
  
      return srcSliceH;
  }
  
  static int yuv422pToUyvyWrapper(SwsContext *c, const uint8_t *src[],
                                  int srcStride[], int srcSliceY, int srcSliceH,
                                  uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *dst = dstParam[0] + dstStride[0] * srcSliceY;
  
      yuv422ptouyvy(src[0], src[1], src[2], dst, c->srcW, srcSliceH, srcStride[0],
                    srcStride[1], dstStride[0]);
  
      return srcSliceH;
  }
  
  static int yuyvToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
      uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
      uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
  
      yuyvtoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
                   dstStride[1], srcStride[0]);
  
      if (dstParam[3])
          fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
  
      return srcSliceH;
  }
  
  static int yuyvToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
      uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
      uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
  
      yuyvtoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
                   dstStride[1], srcStride[0]);
  
      return srcSliceH;
  }
  
  static int uyvyToYuv420Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
      uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY / 2;
      uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY / 2;
  
      uyvytoyuv420(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
                   dstStride[1], srcStride[0]);
  
      if (dstParam[3])
          fillPlane(dstParam[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
  
      return srcSliceH;
  }
  
  static int uyvyToYuv422Wrapper(SwsContext *c, const uint8_t *src[],
                                 int srcStride[], int srcSliceY, int srcSliceH,
                                 uint8_t *dstParam[], int dstStride[])
  {
      uint8_t *ydst = dstParam[0] + dstStride[0] * srcSliceY;
      uint8_t *udst = dstParam[1] + dstStride[1] * srcSliceY;
      uint8_t *vdst = dstParam[2] + dstStride[2] * srcSliceY;
  
      uyvytoyuv422(ydst, udst, vdst, src[0], c->srcW, srcSliceH, dstStride[0],
                   dstStride[1], srcStride[0]);
  
      return srcSliceH;
  }
  
  static void gray8aToPacked32(const uint8_t *src, uint8_t *dst, int num_pixels,
                               const uint8_t *palette)
  {
      int i;
      for (i = 0; i < num_pixels; i++)
          ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | (src[(i << 1) + 1] << 24);
  }
  
  static void gray8aToPacked32_1(const uint8_t *src, uint8_t *dst, int num_pixels,
                                 const uint8_t *palette)
  {
      int i;
  
      for (i = 0; i < num_pixels; i++)
          ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i << 1]] | src[(i << 1) + 1];
  }
  
  static void gray8aToPacked24(const uint8_t *src, uint8_t *dst, int num_pixels,
                               const uint8_t *palette)
  {
      int i;
  
      for (i = 0; i < num_pixels; i++) {
          //FIXME slow?
          dst[0] = palette[src[i << 1] * 4 + 0];
          dst[1] = palette[src[i << 1] * 4 + 1];
          dst[2] = palette[src[i << 1] * 4 + 2];
          dst += 3;
      }
  }
  
  static int packed_16bpc_bswap(SwsContext *c, const uint8_t *src[],
                                int srcStride[], int srcSliceY, int srcSliceH,
                                uint8_t *dst[], int dstStride[])
  {
      int i, j;
      int srcstr = srcStride[0] >> 1;
      int dststr = dstStride[0] >> 1;
      uint16_t       *dstPtr =       (uint16_t *) dst[0];
      const uint16_t *srcPtr = (const uint16_t *) src[0];
      int min_stride         = FFMIN(srcstr, dststr);
  
      for (i = 0; i < srcSliceH; i++) {
          for (j = 0; j < min_stride; j++) {
              dstPtr[j] = av_bswap16(srcPtr[j]);
          }
          srcPtr += srcstr;
          dstPtr += dststr;
      }
  
      return srcSliceH;
  }
  
  static int palToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
                             int srcSliceY, int srcSliceH, uint8_t *dst[],
                             int dstStride[])
  {
      const enum AVPixelFormat srcFormat = c->srcFormat;
      const enum AVPixelFormat dstFormat = c->dstFormat;
      void (*conv)(const uint8_t *src, uint8_t *dst, int num_pixels,
                   const uint8_t *palette) = NULL;
      int i;
      uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
      const uint8_t *srcPtr = src[0];
  
      if (srcFormat == AV_PIX_FMT_GRAY8A) {
          switch (dstFormat) {
          case AV_PIX_FMT_RGB32  : conv = gray8aToPacked32; break;
          case AV_PIX_FMT_BGR32  : conv = gray8aToPacked32; break;
          case AV_PIX_FMT_BGR32_1: conv = gray8aToPacked32_1; break;
          case AV_PIX_FMT_RGB32_1: conv = gray8aToPacked32_1; break;
          case AV_PIX_FMT_RGB24  : conv = gray8aToPacked24; break;
          case AV_PIX_FMT_BGR24  : conv = gray8aToPacked24; break;
          }
      } else if (usePal(srcFormat)) {
          switch (dstFormat) {
          case AV_PIX_FMT_RGB32  : conv = sws_convertPalette8ToPacked32; break;
          case AV_PIX_FMT_BGR32  : conv = sws_convertPalette8ToPacked32; break;
          case AV_PIX_FMT_BGR32_1: conv = sws_convertPalette8ToPacked32; break;
          case AV_PIX_FMT_RGB32_1: conv = sws_convertPalette8ToPacked32; break;
          case AV_PIX_FMT_RGB24  : conv = sws_convertPalette8ToPacked24; break;
          case AV_PIX_FMT_BGR24  : conv = sws_convertPalette8ToPacked24; break;
          }
      }
  
      if (!conv)
          av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
                 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
      else {
          for (i = 0; i < srcSliceH; i++) {
              conv(srcPtr, dstPtr, c->srcW, (uint8_t *) c->pal_rgb);
              srcPtr += srcStride[0];
              dstPtr += dstStride[0];
          }
      }
  
      return srcSliceH;
  }
  
  static void gbr24ptopacked24(const uint8_t *src[], int srcStride[],
                               uint8_t *dst, int dstStride, int srcSliceH,
                               int width)
  {
      int x, h, i;
      for (h = 0; h < srcSliceH; h++) {
          uint8_t *dest = dst + dstStride * h;
          for (x = 0; x < width; x++) {
              *dest++ = src[0][x];
              *dest++ = src[1][x];
              *dest++ = src[2][x];
          }
  
          for (i = 0; i < 3; i++)
              src[i] += srcStride[i];
      }
  }
  
  static void gbr24ptopacked32(const uint8_t *src[], int srcStride[],
                               uint8_t *dst, int dstStride, int srcSliceH,
                               int alpha_first, int width)
  {
      int x, h, i;
      for (h = 0; h < srcSliceH; h++) {
          uint8_t *dest = dst + dstStride * h;
  
          if (alpha_first) {
              for (x = 0; x < width; x++) {
                  *dest++ = 0xff;
                  *dest++ = src[0][x];
                  *dest++ = src[1][x];
                  *dest++ = src[2][x];
              }
          } else {
              for (x = 0; x < width; x++) {
                  *dest++ = src[0][x];
                  *dest++ = src[1][x];
                  *dest++ = src[2][x];
                  *dest++ = 0xff;
              }
          }
  
          for (i = 0; i < 3; i++)
              src[i] += srcStride[i];
      }
  }
  
  static int planarRgbToRgbWrapper(SwsContext *c, const uint8_t *src[],
                                   int srcStride[], int srcSliceY, int srcSliceH,
                                   uint8_t *dst[], int dstStride[])
  {
      int alpha_first = 0;
      const uint8_t *src102[] = { src[1], src[0], src[2] };
      const uint8_t *src201[] = { src[2], src[0], src[1] };
      int stride102[] = { srcStride[1], srcStride[0], srcStride[2] };
      int stride201[] = { srcStride[2], srcStride[0], srcStride[1] };
  
      if (c->srcFormat != AV_PIX_FMT_GBRP) {
          av_log(c, AV_LOG_ERROR, "unsupported planar RGB conversion %s -> %s\n",
                 av_get_pix_fmt_name(c->srcFormat),
                 av_get_pix_fmt_name(c->dstFormat));
          return srcSliceH;
      }
  
      switch (c->dstFormat) {
      case AV_PIX_FMT_BGR24:
          gbr24ptopacked24(src102, stride102,
                           dst[0] + srcSliceY * dstStride[0], dstStride[0],
                           srcSliceH, c->srcW);
          break;
  
      case AV_PIX_FMT_RGB24:
          gbr24ptopacked24(src201, stride201,
                           dst[0] + srcSliceY * dstStride[0], dstStride[0],
                           srcSliceH, c->srcW);
          break;
  
      case AV_PIX_FMT_ARGB:
          alpha_first = 1;
      case AV_PIX_FMT_RGBA:
          gbr24ptopacked32(src201, stride201,
                           dst[0] + srcSliceY * dstStride[0], dstStride[0],
                           srcSliceH, alpha_first, c->srcW);
          break;
  
      case AV_PIX_FMT_ABGR:
          alpha_first = 1;
      case AV_PIX_FMT_BGRA:
          gbr24ptopacked32(src102, stride102,
                           dst[0] + srcSliceY * dstStride[0], dstStride[0],
                           srcSliceH, alpha_first, c->srcW);
          break;
  
      default:
          av_log(c, AV_LOG_ERROR,
                 "unsupported planar RGB conversion %s -> %s\n",
                 av_get_pix_fmt_name(c->srcFormat),
                 av_get_pix_fmt_name(c->dstFormat));
      }
  
      return srcSliceH;
  }
  
  #define isRGBA32(x) (            \
             (x) == AV_PIX_FMT_ARGB   \
          || (x) == AV_PIX_FMT_RGBA   \
          || (x) == AV_PIX_FMT_BGRA   \
          || (x) == AV_PIX_FMT_ABGR   \
          )
  
  #define isRGBA64(x) (                \
             (x) == AV_PIX_FMT_RGBA64LE   \
          || (x) == AV_PIX_FMT_RGBA64BE   \
          || (x) == AV_PIX_FMT_BGRA64LE   \
          || (x) == AV_PIX_FMT_BGRA64BE   \
          )
  
  #define isRGB48(x) (                \
             (x) == AV_PIX_FMT_RGB48LE   \
          || (x) == AV_PIX_FMT_RGB48BE   \
          || (x) == AV_PIX_FMT_BGR48LE   \
          || (x) == AV_PIX_FMT_BGR48BE   \
          )
  
  /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
  typedef void (* rgbConvFn) (const uint8_t *, uint8_t *, int);
  static rgbConvFn findRgbConvFn(SwsContext *c)
  {
      const enum AVPixelFormat srcFormat = c->srcFormat;
      const enum AVPixelFormat dstFormat = c->dstFormat;
      const int srcId = c->srcFormatBpp;
      const int dstId = c->dstFormatBpp;
      rgbConvFn conv = NULL;
  
  #define IS_NOT_NE(bpp, desc) \
      (((bpp + 7) >> 3) == 2 && \
       (!(desc->flags & PIX_FMT_BE) != !HAVE_BIGENDIAN))
  
  #define CONV_IS(src, dst) (srcFormat == AV_PIX_FMT_##src && dstFormat == AV_PIX_FMT_##dst)
  
      if (isRGBA32(srcFormat) && isRGBA32(dstFormat)) {
          if (     CONV_IS(ABGR, RGBA)
                || CONV_IS(ARGB, BGRA)
                || CONV_IS(BGRA, ARGB)
                || CONV_IS(RGBA, ABGR)) conv = shuffle_bytes_3210;
          else if (CONV_IS(ABGR, ARGB)
                || CONV_IS(ARGB, ABGR)) conv = shuffle_bytes_0321;
          else if (CONV_IS(ABGR, BGRA)
                || CONV_IS(ARGB, RGBA)) conv = shuffle_bytes_1230;
          else if (CONV_IS(BGRA, RGBA)
                || CONV_IS(RGBA, BGRA)) conv = shuffle_bytes_2103;
          else if (CONV_IS(BGRA, ABGR)
                || CONV_IS(RGBA, ARGB)) conv = shuffle_bytes_3012;
      } else if (isRGB48(srcFormat) && isRGB48(dstFormat)) {
          if      (CONV_IS(RGB48LE, BGR48LE)
                || CONV_IS(BGR48LE, RGB48LE)
                || CONV_IS(RGB48BE, BGR48BE)
                || CONV_IS(BGR48BE, RGB48BE)) conv = rgb48tobgr48_nobswap;
          else if (CONV_IS(RGB48LE, BGR48BE)
                || CONV_IS(BGR48LE, RGB48BE)
                || CONV_IS(RGB48BE, BGR48LE)
                || CONV_IS(BGR48BE, RGB48LE)) conv = rgb48tobgr48_bswap;
      } else if (isRGBA64(srcFormat) && isRGB48(dstFormat)) {
          if      (CONV_IS(RGBA64LE, BGR48LE)
                || CONV_IS(BGRA64LE, RGB48LE)
                || CONV_IS(RGBA64BE, BGR48BE)
                || CONV_IS(BGRA64BE, RGB48BE)) conv = rgb64tobgr48_nobswap;
          else if (CONV_IS(RGBA64LE, BGR48BE)
                || CONV_IS(BGRA64LE, RGB48BE)
                || CONV_IS(RGBA64BE, BGR48LE)
                || CONV_IS(BGRA64BE, RGB48LE)) conv = rgb64tobgr48_bswap;
          else if (CONV_IS(RGBA64LE, RGB48LE)
                || CONV_IS(BGRA64LE, BGR48LE)
                || CONV_IS(RGBA64BE, RGB48BE)
                || CONV_IS(BGRA64BE, BGR48BE)) conv = rgb64to48_nobswap;
          else if (CONV_IS(RGBA64LE, RGB48BE)
                || CONV_IS(BGRA64LE, BGR48BE)
                || CONV_IS(RGBA64BE, RGB48LE)
                || CONV_IS(BGRA64BE, BGR48LE)) conv = rgb64to48_bswap;
      } else
      /* BGR -> BGR */
      if ((isBGRinInt(srcFormat) && isBGRinInt(dstFormat)) ||
          (isRGBinInt(srcFormat) && isRGBinInt(dstFormat))) {
          switch (srcId | (dstId << 16)) {
          case 0x000F000C: conv = rgb12to15; break;
          case 0x000F0010: conv = rgb16to15; break;
          case 0x000F0018: conv = rgb24to15; break;
          case 0x000F0020: conv = rgb32to15; break;
          case 0x0010000F: conv = rgb15to16; break;
          case 0x00100018: conv = rgb24to16; break;
          case 0x00100020: conv = rgb32to16; break;
          case 0x0018000F: conv = rgb15to24; break;
          case 0x00180010: conv = rgb16to24; break;
          case 0x00180020: conv = rgb32to24; break;
          case 0x0020000F: conv = rgb15to32; break;
          case 0x00200010: conv = rgb16to32; break;
          case 0x00200018: conv = rgb24to32; break;
          }
      } else if ((isBGRinInt(srcFormat) && isRGBinInt(dstFormat)) ||
                 (isRGBinInt(srcFormat) && isBGRinInt(dstFormat))) {
          switch (srcId | (dstId << 16)) {
          case 0x000C000C: conv = rgb12tobgr12; break;
          case 0x000F000F: conv = rgb15tobgr15; break;
          case 0x000F0010: conv = rgb16tobgr15; break;
          case 0x000F0018: conv = rgb24tobgr15; break;
          case 0x000F0020: conv = rgb32tobgr15; break;
          case 0x0010000F: conv = rgb15tobgr16; break;
          case 0x00100010: conv = rgb16tobgr16; break;
          case 0x00100018: conv = rgb24tobgr16; break;
          case 0x00100020: conv = rgb32tobgr16; break;
          case 0x0018000F: conv = rgb15tobgr24; break;
          case 0x00180010: conv = rgb16tobgr24; break;
          case 0x00180018: conv = rgb24tobgr24; break;
          case 0x00180020: conv = rgb32tobgr24; break;
          case 0x0020000F: conv = rgb15tobgr32; break;
          case 0x00200010: conv = rgb16tobgr32; break;
          case 0x00200018: conv = rgb24tobgr32; break;
          }
      }
  
      if ((dstFormat == AV_PIX_FMT_RGB32_1 || dstFormat == AV_PIX_FMT_BGR32_1) && !isRGBA32(srcFormat) && ALT32_CORR<0)
          return NULL;
  
      return conv;
  }
  
  /* {RGB,BGR}{15,16,24,32,32_1} -> {RGB,BGR}{15,16,24,32} */
  static int rgbToRgbWrapper(SwsContext *c, const uint8_t *src[], int srcStride[],
                             int srcSliceY, int srcSliceH, uint8_t *dst[],
                             int dstStride[])
  
  {
      const enum AVPixelFormat srcFormat = c->srcFormat;
      const enum AVPixelFormat dstFormat = c->dstFormat;
      const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);
      const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);
      const int srcBpp = (c->srcFormatBpp + 7) >> 3;
      const int dstBpp = (c->dstFormatBpp + 7) >> 3;
      rgbConvFn conv = findRgbConvFn(c);
  
      if (!conv) {
          av_log(c, AV_LOG_ERROR, "internal error %s -> %s converter\n",
                 av_get_pix_fmt_name(srcFormat), av_get_pix_fmt_name(dstFormat));
      } else {
          const uint8_t *srcPtr = src[0];
                uint8_t *dstPtr = dst[0];
          int src_bswap = IS_NOT_NE(c->srcFormatBpp, desc_src);
          int dst_bswap = IS_NOT_NE(c->dstFormatBpp, desc_dst);
  
          if ((srcFormat == AV_PIX_FMT_RGB32_1 || srcFormat == AV_PIX_FMT_BGR32_1) &&
              !isRGBA32(dstFormat))
              srcPtr += ALT32_CORR;
  
          if ((dstFormat == AV_PIX_FMT_RGB32_1 || dstFormat == AV_PIX_FMT_BGR32_1) &&
              !isRGBA32(srcFormat))
              dstPtr += ALT32_CORR;
  
          if (dstStride[0] * srcBpp == srcStride[0] * dstBpp && srcStride[0] > 0 &&
              !(srcStride[0] % srcBpp) && !dst_bswap && !src_bswap)
              conv(srcPtr, dstPtr + dstStride[0] * srcSliceY,
                   srcSliceH * srcStride[0]);
          else {
              int i, j;
              dstPtr += dstStride[0] * srcSliceY;
  
              for (i = 0; i < srcSliceH; i++) {
                  if(src_bswap) {
                      for(j=0; j<c->srcW; j++)
                          ((uint16_t*)c->formatConvBuffer)[j] = av_bswap16(((uint16_t*)srcPtr)[j]);
                      conv(c->formatConvBuffer, dstPtr, c->srcW * srcBpp);
                  }else
                      conv(srcPtr, dstPtr, c->srcW * srcBpp);
                  if(dst_bswap)
                      for(j=0; j<c->srcW; j++)
                          ((uint16_t*)dstPtr)[j] = av_bswap16(((uint16_t*)dstPtr)[j]);
                  srcPtr += srcStride[0];
                  dstPtr += dstStride[0];
              }
          }
      }
      return srcSliceH;
  }
  
  static int bgr24ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
                                int srcStride[], int srcSliceY, int srcSliceH,
                                uint8_t *dst[], int dstStride[])
  {
      rgb24toyv12(
          src[0],
          dst[0] +  srcSliceY       * dstStride[0],
          dst[1] + (srcSliceY >> 1) * dstStride[1],
          dst[2] + (srcSliceY >> 1) * dstStride[2],
          c->srcW, srcSliceH,
          dstStride[0], dstStride[1], srcStride[0]);
      if (dst[3])
          fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
      return srcSliceH;
  }
  
  static int yvu9ToYv12Wrapper(SwsContext *c, const uint8_t *src[],
                               int srcStride[], int srcSliceY, int srcSliceH,
                               uint8_t *dst[], int dstStride[])
  {
      copyPlane(src[0], srcStride[0], srcSliceY, srcSliceH, c->srcW,
                dst[0], dstStride[0]);
  
      planar2x(src[1], dst[1] + dstStride[1] * (srcSliceY >> 1), c->chrSrcW,
               srcSliceH >> 2, srcStride[1], dstStride[1]);
      planar2x(src[2], dst[2] + dstStride[2] * (srcSliceY >> 1), c->chrSrcW,
               srcSliceH >> 2, srcStride[2], dstStride[2]);
      if (dst[3])
          fillPlane(dst[3], dstStride[3], c->srcW, srcSliceH, srcSliceY, 255);
      return srcSliceH;
  }
  
  /* unscaled copy like stuff (assumes nearly identical formats) */
  static int packedCopyWrapper(SwsContext *c, const uint8_t *src[],
                               int srcStride[], int srcSliceY, int srcSliceH,
                               uint8_t *dst[], int dstStride[])
  {
      if (dstStride[0] == srcStride[0] && srcStride[0] > 0)
          memcpy(dst[0] + dstStride[0] * srcSliceY, src[0], srcSliceH * dstStride[0]);
      else {
          int i;
          const uint8_t *srcPtr = src[0];
          uint8_t *dstPtr = dst[0] + dstStride[0] * srcSliceY;
          int length = 0;
  
          /* universal length finder */
          while (length + c->srcW <= FFABS(dstStride[0]) &&
                 length + c->srcW <= FFABS(srcStride[0]))
              length += c->srcW;
          av_assert1(length != 0);
  
          for (i = 0; i < srcSliceH; i++) {
              memcpy(dstPtr, srcPtr, length);
              srcPtr += srcStride[0];
              dstPtr += dstStride[0];
          }
      }
      return srcSliceH;
  }
  
  #define DITHER_COPY(dst, dstStride, src, srcStride, bswap, dbswap)\
      uint16_t scale= dither_scale[dst_depth-1][src_depth-1];\
      int shift= src_depth-dst_depth + dither_scale[src_depth-2][dst_depth-1];\
      for (i = 0; i < height; i++) {\
          const uint8_t *dither= dithers[src_depth-9][i&7];\
          for (j = 0; j < length-7; j+=8){\
              dst[j+0] = dbswap((bswap(src[j+0]) + dither[0])*scale>>shift);\
              dst[j+1] = dbswap((bswap(src[j+1]) + dither[1])*scale>>shift);\
              dst[j+2] = dbswap((bswap(src[j+2]) + dither[2])*scale>>shift);\
              dst[j+3] = dbswap((bswap(src[j+3]) + dither[3])*scale>>shift);\
              dst[j+4] = dbswap((bswap(src[j+4]) + dither[4])*scale>>shift);\
              dst[j+5] = dbswap((bswap(src[j+5]) + dither[5])*scale>>shift);\
              dst[j+6] = dbswap((bswap(src[j+6]) + dither[6])*scale>>shift);\
              dst[j+7] = dbswap((bswap(src[j+7]) + dither[7])*scale>>shift);\
          }\
          for (; j < length; j++)\
              dst[j] = dbswap((bswap(src[j]) + dither[j&7])*scale>>shift);\
          dst += dstStride;\
          src += srcStride;\
      }
  
  static int planarCopyWrapper(SwsContext *c, const uint8_t *src[],
                               int srcStride[], int srcSliceY, int srcSliceH,
                               uint8_t *dst[], int dstStride[])
  {
      const AVPixFmtDescriptor *desc_src = av_pix_fmt_desc_get(c->srcFormat);
      const AVPixFmtDescriptor *desc_dst = av_pix_fmt_desc_get(c->dstFormat);
      int plane, i, j;
      for (plane = 0; plane < 4; plane++) {
          int length = (plane == 0 || plane == 3) ? c->srcW  : -((-c->srcW  ) >> c->chrDstHSubSample);
          int y =      (plane == 0 || plane == 3) ? srcSliceY: -((-srcSliceY) >> c->chrDstVSubSample);
          int height = (plane == 0 || plane == 3) ? srcSliceH: -((-srcSliceH) >> c->chrDstVSubSample);
          const uint8_t *srcPtr = src[plane];
          uint8_t *dstPtr = dst[plane] + dstStride[plane] * y;
          int shiftonly= plane==1 || plane==2 || (!c->srcRange && plane==0);
  
          if (!dst[plane])
              continue;
          // ignore palette for GRAY8
          if (plane == 1 && !dst[2]) continue;
          if (!src[plane] || (plane == 1 && !src[2])) {
              if (is16BPS(c->dstFormat) || isNBPS(c->dstFormat)) {
                  fillPlane16(dst[plane], dstStride[plane], length, height, y,
                          plane == 3, desc_dst->comp[plane].depth_minus1,
                          isBE(c->dstFormat));
              } else {
                  fillPlane(dst[plane], dstStride[plane], length, height, y,
                          (plane == 3) ? 255 : 128);
              }
          } else {
              if(isNBPS(c->srcFormat) || isNBPS(c->dstFormat)
                 || (is16BPS(c->srcFormat) != is16BPS(c->dstFormat))
              ) {
                  const int src_depth = desc_src->comp[plane].depth_minus1 + 1;
                  const int dst_depth = desc_dst->comp[plane].depth_minus1 + 1;
                  const uint16_t *srcPtr2 = (const uint16_t *) srcPtr;
                  uint16_t *dstPtr2 = (uint16_t*)dstPtr;
  
                  if (dst_depth == 8) {
                      if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
                          DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, , )
                      } else {
                          DITHER_COPY(dstPtr, dstStride[plane], srcPtr2, srcStride[plane]/2, av_bswap16, )
                      }
                  } else if (src_depth == 8) {
                      for (i = 0; i < height; i++) {
                          #define COPY816(w)\
                          if(shiftonly){\
                              for (j = 0; j < length; j++)\
                                  w(&dstPtr2[j], srcPtr[j]<<(dst_depth-8));\
                          }else{\
                              for (j = 0; j < length; j++)\
                                  w(&dstPtr2[j], (srcPtr[j]<<(dst_depth-8)) |\
                                                 (srcPtr[j]>>(2*8-dst_depth)));\
                          }
                          if(isBE(c->dstFormat)){
                              COPY816(AV_WB16)
                          } else {
                              COPY816(AV_WL16)
                          }
                          dstPtr2 += dstStride[plane]/2;
                          srcPtr  += srcStride[plane];
                      }
                  } else if (src_depth <= dst_depth) {
                      int orig_length = length;
                      for (i = 0; i < height; i++) {
                          if(isBE(c->srcFormat) == HAVE_BIGENDIAN &&
                             isBE(c->dstFormat) == HAVE_BIGENDIAN &&
                             shiftonly) {
                               unsigned shift = dst_depth - src_depth;
                               length = orig_length;
  #if HAVE_FAST_64BIT
  #define FAST_COPY_UP(shift) \
      for (j = 0; j < length - 3; j += 4) { \
          uint64_t v = AV_RN64A(srcPtr2 + j); \
          AV_WN64A(dstPtr2 + j, v << shift); \
      } \
      length &= 3;
  #else
  #define FAST_COPY_UP(shift) \
      for (j = 0; j < length - 1; j += 2) { \
          uint32_t v = AV_RN32A(srcPtr2 + j); \
          AV_WN32A(dstPtr2 + j, v << shift); \
      } \
      length &= 1;
  #endif
                               switch (shift)
                               {
                               case 6: FAST_COPY_UP(6); break;
                               case 7: FAST_COPY_UP(7); break;
                               }
                          }
  #define COPY_UP(r,w) \
      if(shiftonly){\
          for (j = 0; j < length; j++){ \
              unsigned int v= r(&srcPtr2[j]);\
              w(&dstPtr2[j], v<<(dst_depth-src_depth));\
          }\
      }else{\
          for (j = 0; j < length; j++){ \
              unsigned int v= r(&srcPtr2[j]);\
              w(&dstPtr2[j], (v<<(dst_depth-src_depth)) | \
                          (v>>(2*src_depth-dst_depth)));\
          }\
      }
                          if(isBE(c->srcFormat)){
                              if(isBE(c->dstFormat)){
                                  COPY_UP(AV_RB16, AV_WB16)
                              } else {
                                  COPY_UP(AV_RB16, AV_WL16)
                              }
                          } else {
                              if(isBE(c->dstFormat)){
                                  COPY_UP(AV_RL16, AV_WB16)
                              } else {
                                  COPY_UP(AV_RL16, AV_WL16)
                              }
                          }
                          dstPtr2 += dstStride[plane]/2;
                          srcPtr2 += srcStride[plane]/2;
                      }
                  } else {
                      if(isBE(c->srcFormat) == HAVE_BIGENDIAN){
                          if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
                              DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , )
                          } else {
                              DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, , av_bswap16)
                          }
                      }else{
                          if(isBE(c->dstFormat) == HAVE_BIGENDIAN){
                              DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, )
                          } else {
                              DITHER_COPY(dstPtr2, dstStride[plane]/2, srcPtr2, srcStride[plane]/2, av_bswap16, av_bswap16)
                          }
                      }
                  }
              } else if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat) &&
                        isBE(c->srcFormat) != isBE(c->dstFormat)) {
  
                  for (i = 0; i < height; i++) {
                      for (j = 0; j < length; j++)
                          ((uint16_t *) dstPtr)[j] = av_bswap16(((const uint16_t *) srcPtr)[j]);
                      srcPtr += srcStride[plane];
                      dstPtr += dstStride[plane];
                  }
              } else if (dstStride[plane] == srcStride[plane] &&
                         srcStride[plane] > 0 && srcStride[plane] == length) {
                  memcpy(dst[plane] + dstStride[plane] * y, src[plane],
                         height * dstStride[plane]);
              } else {
                  if (is16BPS(c->srcFormat) && is16BPS(c->dstFormat))
                      length *= 2;
                  else if (!desc_src->comp[0].depth_minus1)
                      length >>= 3; // monowhite/black
                  for (i = 0; i < height; i++) {
                      memcpy(dstPtr, srcPtr, length);
                      srcPtr += srcStride[plane];
                      dstPtr += dstStride[plane];
                  }
              }
          }
      }
      return srcSliceH;
  }
  
  
  #define IS_DIFFERENT_ENDIANESS(src_fmt, dst_fmt, pix_fmt)          \
      ((src_fmt == pix_fmt ## BE && dst_fmt == pix_fmt ## LE) ||     \
       (src_fmt == pix_fmt ## LE && dst_fmt == pix_fmt ## BE))
  
  
  void ff_get_unscaled_swscale(SwsContext *c)
  {
      const enum AVPixelFormat srcFormat = c->srcFormat;
      const enum AVPixelFormat dstFormat = c->dstFormat;
      const int flags = c->flags;
      const int dstH = c->dstH;
      int needsDither;
  
      needsDither = isAnyRGB(dstFormat) &&
              c->dstFormatBpp < 24 &&
             (c->dstFormatBpp < c->srcFormatBpp || (!isAnyRGB(srcFormat)));
  
      /* yv12_to_nv12 */
      if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUVA420P) &&
          (dstFormat == AV_PIX_FMT_NV12 || dstFormat == AV_PIX_FMT_NV21)) {
          c->swScale = planarToNv12Wrapper;
      }
      /* yuv2bgr */
      if ((srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUV422P ||
           srcFormat == AV_PIX_FMT_YUVA420P) && isAnyRGB(dstFormat) &&
          !(flags & SWS_ACCURATE_RND) && !(dstH & 1)) {
          c->swScale = ff_yuv2rgb_get_func_ptr(c);
      }
  
      if (srcFormat == AV_PIX_FMT_YUV410P &&
          (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P) &&
          !(flags & SWS_BITEXACT)) {
          c->swScale = yvu9ToYv12Wrapper;
      }
  
      /* bgr24toYV12 */
      if (srcFormat == AV_PIX_FMT_BGR24 &&
          (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P) &&
          !(flags & SWS_ACCURATE_RND))
          c->swScale = bgr24ToYv12Wrapper;
  
      /* RGB/BGR -> RGB/BGR (no dither needed forms) */
      if (isAnyRGB(srcFormat) && isAnyRGB(dstFormat) && findRgbConvFn(c)
          && (!needsDither || (c->flags&(SWS_FAST_BILINEAR|SWS_POINT))))
          c->swScale= rgbToRgbWrapper;
  
  #define isByteRGB(f) (\
          f == AV_PIX_FMT_RGB32   ||\
          f == AV_PIX_FMT_RGB32_1 ||\
          f == AV_PIX_FMT_RGB24   ||\
          f == AV_PIX_FMT_BGR32   ||\
          f == AV_PIX_FMT_BGR32_1 ||\
          f == AV_PIX_FMT_BGR24)
  
      if (isAnyRGB(srcFormat) && isPlanar(srcFormat) && isByteRGB(dstFormat))
          c->swScale = planarRgbToRgbWrapper;
  
      /* bswap 16 bits per pixel/component packed formats */
      if (IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR444) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR48)  ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGRA64) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR555) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_BGR565) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_GRAY16) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB444) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB48)  ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGBA64) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB555) ||
          IS_DIFFERENT_ENDIANESS(srcFormat, dstFormat, AV_PIX_FMT_RGB565))
          c->swScale = packed_16bpc_bswap;
  
      if (usePal(srcFormat) && isByteRGB(dstFormat))
          c->swScale = palToRgbWrapper;
  
      if (srcFormat == AV_PIX_FMT_YUV422P) {
          if (dstFormat == AV_PIX_FMT_YUYV422)
              c->swScale = yuv422pToYuy2Wrapper;
          else if (dstFormat == AV_PIX_FMT_UYVY422)
              c->swScale = yuv422pToUyvyWrapper;
      }
  
      /* LQ converters if -sws 0 or -sws 4*/
      if (c->flags&(SWS_FAST_BILINEAR|SWS_POINT)) {
          /* yv12_to_yuy2 */
          if (srcFormat == AV_PIX_FMT_YUV420P || srcFormat == AV_PIX_FMT_YUVA420P) {
              if (dstFormat == AV_PIX_FMT_YUYV422)
                  c->swScale = planarToYuy2Wrapper;
              else if (dstFormat == AV_PIX_FMT_UYVY422)
                  c->swScale = planarToUyvyWrapper;
          }
      }
      if (srcFormat == AV_PIX_FMT_YUYV422 &&
         (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P))
          c->swScale = yuyvToYuv420Wrapper;
      if (srcFormat == AV_PIX_FMT_UYVY422 &&
         (dstFormat == AV_PIX_FMT_YUV420P || dstFormat == AV_PIX_FMT_YUVA420P))
          c->swScale = uyvyToYuv420Wrapper;
      if (srcFormat == AV_PIX_FMT_YUYV422 && dstFormat == AV_PIX_FMT_YUV422P)
          c->swScale = yuyvToYuv422Wrapper;
      if (srcFormat == AV_PIX_FMT_UYVY422 && dstFormat == AV_PIX_FMT_YUV422P)
          c->swScale = uyvyToYuv422Wrapper;
  
  #define isPlanarGray(x) (isGray(x) && (x) != AV_PIX_FMT_GRAY8A)
      /* simple copy */
      if ( srcFormat == dstFormat ||
          (srcFormat == AV_PIX_FMT_YUVA420P && dstFormat == AV_PIX_FMT_YUV420P) ||
          (srcFormat == AV_PIX_FMT_YUV420P && dstFormat == AV_PIX_FMT_YUVA420P) ||
          (isPlanarYUV(srcFormat) && isPlanarGray(dstFormat)) ||
          (isPlanarYUV(dstFormat) && isPlanarGray(srcFormat)) ||
          (isPlanarGray(dstFormat) && isPlanarGray(srcFormat)) ||
          (isPlanarYUV(srcFormat) && isPlanarYUV(dstFormat) &&
           c->chrDstHSubSample == c->chrSrcHSubSample &&
           c->chrDstVSubSample == c->chrSrcVSubSample &&
           dstFormat != AV_PIX_FMT_NV12 && dstFormat != AV_PIX_FMT_NV21 &&
           srcFormat != AV_PIX_FMT_NV12 && srcFormat != AV_PIX_FMT_NV21))
      {
          if (isPacked(c->srcFormat))
              c->swScale = packedCopyWrapper;
          else /* Planar YUV or gray */
              c->swScale = planarCopyWrapper;
      }
  
      if (ARCH_BFIN)
          ff_bfin_get_unscaled_swscale(c);
      if (HAVE_ALTIVEC)
          ff_swscale_get_unscaled_altivec(c);
  }
  
  /* Convert the palette to the same packed 32-bit format as the palette */
  void sws_convertPalette8ToPacked32(const uint8_t *src, uint8_t *dst,
                                     int num_pixels, const uint8_t *palette)
  {
      int i;
  
      for (i = 0; i < num_pixels; i++)
          ((uint32_t *) dst)[i] = ((const uint32_t *) palette)[src[i]];
  }
  
  /* Palette format: ABCD -> dst format: ABC */
  void sws_convertPalette8ToPacked24(const uint8_t *src, uint8_t *dst,
                                     int num_pixels, const uint8_t *palette)
  {
      int i;
  
      for (i = 0; i < num_pixels; i++) {
          //FIXME slow?
          dst[0] = palette[src[i] * 4 + 0];
          dst[1] = palette[src[i] * 4 + 1];
          dst[2] = palette[src[i] * 4 + 2];
          dst += 3;
      }
  }
  