vid_putvlc.c

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/************************************************************************
 *
 *  tmn (TMN encoder)
 *  Copyright (C) 1995, 1996  Telenor R&D, Norway
 *        Karl Olav Lillevold <Karl.Lillevold@nta.no>
 *  
 *  Contacts: 
 *  Karl Olav Lillevold               <Karl.Lillevold@nta.no>, or
 *  Robert Danielsen                  <Robert.Danielsen@nta.no>
 *
 *  Telenor Research and Development  http://www.nta.no/brukere/DVC/
 *  P.O.Box 83                        tel.:   +47 63 84 84 00
 *  N-2007 Kjeller, Norway            fax.:   +47 63 81 00 76
 *  
 ************************************************************************/

/*
 * Disclaimer of Warranty
 *
 * These software programs are available to the user without any
 * license fee or royalty on an "as is" basis.  Telenor Research and
 * Development 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.
 *
 * Telenor Research and Development 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.
 * */


/************************************************************************
 *
 * Author:        Robert Danielsen <Robert.Danielsen@nta.no>
 * Date:        06.05.96
 *
 * Comment:     Besed on ideas from MPEG-2 Software Simulation Group
 *
 ************************************************************************/

#include <assert.h>
#include "vid_sim.h"
#include "vid_vlc.h"

int
put_mv (int mvint)
{
  int sign = 0;
  int absmv;

  if (mvint >= 32) {
    absmv = -mvint + 64;
    sign = 1;
  }
  else
    absmv = mvint;
  
  putbits (mvtab[absmv].len, mvtab[absmv].code);

  if (mvint != 0) {
    putbits (1, sign);
    return mvtab[absmv].len + 1;
  }
  else
    return mvtab[absmv].len;
}

int
put_cbpcm_intra (int cbpc, int mode)
{
  int index;

  index = ((mode & 3) >> 1) | ((cbpc & 3) << 2);

  putbits (cbpcm_intra_tab[index].len, cbpcm_intra_tab[index].code);
  
  return cbpcm_intra_tab[index].len;
}

int
put_cbpcm_inter (int cbpc, int mode)
{
  int index;

  index = (mode & 7) | ((cbpc & 3) << 3);

  putbits (cbpcm_inter_tab[index].len, cbpcm_inter_tab[index].code);
  
  return cbpcm_inter_tab[index].len;
}


int
put_cbpy (int cbp, int mode)
{
  int index;

  index = cbp >> 2;

  if (mode < 3)
    index ^= 15;
  
  putbits (cbpy_tab[index].len, cbpy_tab[index].code);
  
  return cbpy_tab[index].len;
}


int
put_coeff (int run, int level, int last)
{
  int length = 0;
  
  assert (last >= 0 && last < 2);
  assert (run >= 0 && run < 64);
  assert (level > 0 && level < 128);
  
  if (last == 0) {
    if (run < 2 && level < 13 ) {
      putbits (coeff_tab0[run][level-1].len,
               coeff_tab0[run][level-1].code);

      length = coeff_tab0[run][level-1].len;
    }
    else if (run > 1 && run < 27 && level < 5) {
      putbits (coeff_tab1[run-2][level-1].len,
               coeff_tab1[run-2][level-1].code);
      
      length = coeff_tab1[run-2][level-1].len;
    }
  }
  else if (last == 1) {
    if (run < 2 && level < 4) {
      putbits (coeff_tab2[run][level-1].len,
               coeff_tab2[run][level-1].code);
      
      length = coeff_tab2[run][level-1].len;
    }
    else if (run > 1 && run < 42 && level == 1) {
      putbits (coeff_tab3[run-2].len,
               coeff_tab3[run-2].code);
      
      length = coeff_tab3[run-2].len;
    }
  }
  return length;
}
      
    

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