getvlc.c

H.263+(VC++商业源代码)

#include <stdio.h>

#include "config.h"
#include "global.h"
#include "getvlc.h"

//deng
// BUGS ARE HERE!!!!!!!!!!1
int ____getTMNMV()
{
  int code;

 
  if (getbits1())
  {
       return 0;
  }

  if ((code = showbits(12))>=512)
  {
    code = (code>>8) - 2;
	if( code < 0 ) code = 0 ;
	if( code>=14 ) code =13;
    flushbits(TMNMVtab0[code].len);
    
    return TMNMVtab0[code].val;
  }

  // DENG:BUGS ARE HERE!!!!!!!!!!1
  if ((code-=5)<0)
  {
	  code = 5 ; 
  }
  if (code>=128)
  {
    code = (code>>2) -32;
	if( code < 0 ) code = 0 ;
	if( code>=96 ) code =95;

    flushbits(TMNMVtab1[code].len);

    
    return TMNMVtab1[code].val;
  }


  flushbits(TMNMVtab2[code].len);

  
  return TMNMVtab2[code].val;
}

// DENG: THE CORRECT getTMNMV
int getTMNMV()
{
  int code;

  if (getbits1())
  {
    return 0;
  }

  if ((code = showbits(12))>=512)
  {
    code = (code>>8) - 2;
    flushbits(TMNMVtab0[code].len);

    return TMNMVtab0[code].val;
  }

  if (code>=128)
  {
    code = (code>>2) -32;
    flushbits(TMNMVtab1[code].len);

    return TMNMVtab1[code].val;
  }

  if ((code-=5)<0)
  {
    fault=1;
    return 0;
  }

  flushbits(TMNMVtab2[code].len);

  return TMNMVtab2[code].val;
}

int getMCBPC()
{
  int code;


  code = showbits(9);
  if( code == 0 ) code =  1;

  if (code == 1) {
    /* macroblock stuffing */

    flushbits(9);
    return -1;
  }

    
  if (code>=256)
  {
    flushbits(1);
    return 0;
  }
    
  flushbits(MCBPCtab[code].len);


  return MCBPCtab[code].val;
}

int getMODB()
{
  int code;
  int MODB;

 
  code = showbits(2);

  if (code < 2) {
    
    MODB = 0;
    flushbits(1);
  }
  else if (code == 2) {
    
    MODB = 1;
    flushbits(2);
  }
  else { /* code == 3 */
    
    MODB = 2;
    flushbits(2);
  }
  return MODB;
}


int getMCBPCintra()
{
  int code;

  

  code = showbits(9);
  if( code < 8 ) code = 1 ;
  if (code == 1) {
    /* macroblock stuffing */
    
    flushbits(9);
    return -1;
  }

  code >>= 3;
    
  if (code>=32)
  {
    flushbits(1);
    
    return 3;
  }

  flushbits(MCBPCtabintra[code].len);

  
  return MCBPCtabintra[code].val;
}

int getCBPY()
{
  int code;

  

  code = showbits(6);
  if (code < 2) {
	code  = 2 ;
  }
    
  if (code>=48)
  {
    flushbits(2);
    
    return 0;
  }

  flushbits(CBPYtab[code].len);


  return CBPYtab[code].val;
}