yuvrgb24.c

H.263的压缩算法

/************************************************************************
 *
 *  yuvrgb24.c, colour space conversion for tmndecode (H.263 decoder)
 *  Copyright (C) 1995, 1996  Telenor R&D, Norway
 *
 *  Contacts:
 *  Robert Danielsen                  <[e-mail]>
 *
 *  Telenor Research and Development  http://www.nta.no/brukere/DVC/
 *  P.O.Box 83                        tel.:   [phone]
 *  N-2007 Kjeller, Norway            fax.:   [phone]
 *
 *  Copyright (C) 1997  University of BC, Canada
 *  Modified by: Michael Gallant <[e-mail]>
 *               Guy Cote <[e-mail]>
 *               Berna Erol <[e-mail]>
 *
 *  Contacts:
 *  Michael Gallant                   <[e-mail]>
 *
 *  UBC Image Processing Laboratory   http://www.ee.ubc.ca/image
 *  2356 Main Mall                    tel.: [phone]
 *  Vancouver BC Canada V6T1Z4        fax.: [phone]
 *
 ************************************************************************/

/* Disclaimer of Warranty
 * 
 * These software programs are available to the user without any license fee
 * or royalty on an "as is" basis. The University of British Columbia
 * disclaims any and all warranties, whether express, implied, or
 * statuary, including any implied warranties or merchantability or of
 * fitness for a particular purpose.  In no event shall the
 * copyright-holder be liable for any incidental, punitive, or
 * consequential damages of any kind whatsoever arising from the use of
 * these programs.
 * 
 * This disclaimer of warranty extends to the user of these programs and
 * user's customers, employees, agents, transferees, successors, and
 * assigns.
 * 
 * The University of British Columbia does not represent or warrant that the
 * programs furnished hereunder are free of infringement of any
 * third-party patents.
 * 
 * Commercial implementations of H.263, including shareware, are subject to
 * royalty fees to patent holders.  Many of these patents are general
 * enough such that they are unavoidable regardless of implementation
 * design.
 * 
 */



#include "config.h"
#include "tmndec.h"
#include "global.h"

/* Data for ConvertYUVtoRGB */
#if (defined DISPLAY || defined WINDOWS)
long int crv_tab[256];
long int cbu_tab[256];
long int cgu_tab[256];

long int cgv_tab[256];
long int tab_76309[256];

void init_dither_tab ()
{
  long int crv, cbu, cgu, cgv;
  int i;

  crv = 104597;
  cbu = 132201;                 /* fra matrise i global.h */
  cgu = 25675;
  cgv = 53279;

  for (i = 0; i < 256; i++)
  {
    crv_tab[i] = (i - 128) * crv;
    cbu_tab[i] = (i - 128) * cbu;
    cgu_tab[i] = (i - 128) * cgu;
    cgv_tab[i] = (i - 128) * cgv;
    tab_76309[i] = 76309 * (i - 16);
  }
}




/**********************************************************************
 *
 *	Name:	         ConvertYUVtoRGB
 *	Description:     Converts YUV image to RGB (packed mode)
 *
 *	Input:	         pointer to source luma, Cr, Cb, destination,
 *                       image width and height
 *	Returns:
 *	Side effects:
 *
 *	Date: 951208	Author: [e-mail]
 *
 ***********************************************************************/



void ConvertYUVtoRGB (src0, src1, src2, dst_ori, width, height)
  unsigned char *src0, *src1, *src2;
  unsigned char *dst_ori;
  int width, height;
{
  extern long int crv_tab[];
  extern long int cbu_tab[];
  extern long int cgu_tab[];

  extern long int cgv_tab[];
  extern long int tab_76309[];

  int y11, y21;
  int y12, y22;
  int y13, y23;
  int y14, y24;
  int u, v;
  int i, j;
  int c11, c21, c31, c41;
  int c12, c22, c32, c42;
  unsigned int DW;
  unsigned int *id1, *id2;
  unsigned char *py1, *py2, *pu, *pv;
  unsigned char *d1, *d2;

  d1 = dst_ori;
  d1 += width * height * 3 - width * 3;
  d2 = d1 - width * 3;

  py1 = src0;
  pu = src1;
  pv = src2;
  py2 = py1 + width;

  id1 = (unsigned int *) d1;
  id2 = (unsigned int *) d2;

  for (j = 0; j < height; j += 2)
  {
    /* line j + 0 */
    for (i = 0; i < width; i += 4)
    {
      u = *pu++;
      v = *pv++;
      c11 = crv_tab[v];
      c21 = cgu_tab[u];
      c31 = cgv_tab[v];
      c41 = cbu_tab[u];
      u = *pu++;
      v = *pv++;
      c12 = crv_tab[v];
      c22 = cgu_tab[u];
      c32 = cgv_tab[v];
      c42 = cbu_tab[u];

      y11 = tab_76309[*py1++];  /* (255/219)*65536 */
      y12 = tab_76309[*py1++];
      y13 = tab_76309[*py1++];  /* (255/219)*65536 */
      y14 = tab_76309[*py1++];

      y21 = tab_76309[*py2++];
      y22 = tab_76309[*py2++];
      y23 = tab_76309[*py2++];
      y24 = tab_76309[*py2++];

      /* RGBR */
      DW = ((clp[(y11 + c41) >> 16])) |
        ((clp[(y11 - c21 - c31) >> 16]) << 8) |
        ((clp[(y11 + c11) >> 16]) << 16) |
        ((clp[(y12 + c41) >> 16]) << 24);
      *id1++ = DW;

      /* GBRG */
      DW = ((clp[(y12 - c21 - c31) >> 16])) |
        ((clp[(y12 + c11) >> 16]) << 8) |
        ((clp[(y13 + c42) >> 16]) << 16) |
        ((clp[(y13 - c22 - c32) >> 16]) << 24);
      *id1++ = DW;

      /* BRGB */
      DW = ((clp[(y13 + c12) >> 16])) |
        ((clp[(y14 + c42) >> 16]) << 8) |
        ((clp[(y14 - c22 - c32) >> 16]) << 16) |
        ((clp[(y14 + c12) >> 16]) << 24);
      *id1++ = DW;

      /* RGBR */
      DW = ((clp[(y21 + c41) >> 16])) |
        ((clp[(y21 - c21 - c31) >> 16]) << 8) |
        ((clp[(y21 + c11) >> 16]) << 16) |
        ((clp[(y22 + c41) >> 16]) << 24);
      *id2++ = DW;

      /* GBRG */
      DW = ((clp[(y22 - c21 - c31) >> 16])) |
        ((clp[(y22 + c11) >> 16]) << 8) |
        ((clp[(y23 + c42) >> 16]) << 16) |
        ((clp[(y23 - c22 - c32) >> 16]) << 24);
      *id2++ = DW;

      /* BRGB */
      DW = ((clp[(y23 + c12) >> 16])) |
        ((clp[(y24 + c42) >> 16]) << 8) |
        ((clp[(y24 - c22 - c32) >> 16]) << 16) |
        ((clp[(y24 + c12) >> 16]) << 24);
      *id2++ = DW;
    }
    id1 -= (9 * width) >> 2;
    id2 -= (9 * width) >> 2;
    py1 += width;
    py2 += width;
  }
}


#endif