biaridecod.h

包含了从MPEG4的视频解码到H.264的视频编码部分的源代码

/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2001, International Telecommunications Union, Geneva
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the user without any
* license fee or royalty on an "as is" basis. The ITU disclaims
* any and all warranties, whether express, implied, or
* statutory, including any implied warranties of merchantability
* or of fitness for a particular purpose.  In no event shall the
* contributor or the ITU 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 ITU does not represent or warrant that the programs furnished
* hereunder are free of infringement of any third-party patents.
* Commercial implementations of ITU-T Recommendations, including
* shareware, may be subject to royalty fees to patent holders.
* Information regarding the ITU-T patent policy is available from
* the ITU Web site at http://www.itu.int.
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE ITU-T PATENT POLICY.
************************************************************************
*/

/*!
 ***************************************************************************
 * \file
 *    biariencode.h
 *
 * \brief
 *    Headerfile for binary arithmetic decoder routines
 *
 * \author
 *    Detlev Marpe,
 *    Gabi Bl鋞termann
 *    Copyright (C) 2000 HEINRICH HERTZ INSTITUTE All Rights Reserved.
 *
 * \date
 *    21. Oct 2000
 **************************************************************************
 */

#ifndef _BIARIDECOD_H_
#define _BIARIDECOD_H_


/************************************************************************
 * D e f i n i t i o n s
 ***********************************************************************
 */


// some definitions to increase the readability of the source code 

#define Dbuffer         (dep->Dbuffer)
#define Dbits_to_go     (dep->Dbits_to_go)
#define Dcodestrm       (dep->Dcodestrm)
#define Dcodestrm_len   (dep->Dcodestrm_len)

#define B_BITS    10	// Number of bits to represent the whole coding interval
#define HALF      (1 << (B_BITS-1))
#define QUARTER   (1 << (B_BITS-2))

/* Range table for  LPS */ 
const byte rLPS_table_64x4[64][4]=
{
	{ 128, 176, 208, 240},
	{ 128, 167, 197, 227},
	{ 128, 158, 187, 216},
	{ 123, 150, 178, 205},
	{ 116, 142, 169, 195},
	{ 111, 135, 160, 185},
	{ 105, 128, 152, 175},
	{ 100, 122, 144, 166},
	{  95, 116, 137, 158},
	{  90, 110, 130, 150},
	{  85, 104, 123, 142},
	{  81,  99, 117, 135},
	{  77,  94, 111, 128},
	{  73,  89, 105, 122},
	{  69,  85, 100, 116},
	{  66,  80,  95, 110},
	{  62,  76,  90, 104},
	{  59,  72,  86,  99},
	{  56,  69,  81,  94},
	{  53,  65,  77,  89},
	{  51,  62,  73,  85},
	{  48,  59,  69,  80},
	{  46,  56,  66,  76},
	{  43,  53,  63,  72},
	{  41,  50,  59,  69},
	{  39,  48,  56,  65},
	{  37,  45,  54,  62},
	{  35,  43,  51,  59},
	{  33,  41,  48,  56},
	{  32,  39,  46,  53},
	{  30,  37,  43,  50},
	{  29,  35,  41,  48},
	{  27,  33,  39,  45},
	{  26,  31,  37,  43},
	{  24,  30,  35,  41},
	{  23,  28,  33,  39},
	{  22,  27,  32,  37},
	{  21,  26,  30,  35},
	{  20,  24,  29,  33},
	{  19,  23,  27,  31},
	{  18,  22,  26,  30},
	{  17,  21,  25,  28},
	{  16,  20,  23,  27},
	{  15,  19,  22,  25},
	{  14,  18,  21,  24},
	{  14,  17,  20,  23},
	{  13,  16,  19,  22},
	{  12,  15,  18,  21},
	{  12,  14,  17,  20},
	{  11,  14,  16,  19},
	{  11,  13,  15,  18},
	{  10,  12,  15,  17},
	{  10,  12,  14,  16},
	{   9,  11,  13,  15},
	{   9,  11,  12,  14},
	{   8,  10,  12,  14},
	{   8,   9,  11,  13},
	{   7,   9,  11,  12},
	{   7,   9,  10,  12},
	{   7,   8,  10,  11},
	{   6,   8,   9,  11},
	{   6,   7,   9,  10},
	{   6,   7,   8,   9},
	{   2,   2,   2,   2}
};



const unsigned short AC_next_state_MPS_64[64] =    
{
		1,2,3,4,5,6,7,8,9,10,
		11,12,13,14,15,16,17,18,19,20,
		21,22,23,24,25,26,27,28,29,30,
		31,32,33,34,35,36,37,38,39,40,
		41,42,43,44,45,46,47,48,49,50,
		51,52,53,54,55,56,57,58,59,60,
		61,62,62,63
};
	

const unsigned short AC_next_state_LPS_64[64] =    
{
		 0, 0, 1, 2, 2, 4, 4, 5, 6, 7,
		 8, 9, 9,11,11,12,13,13,15,15, 
		 16,16,18,18,19,19,21,21,22,22,
		 23,24,24,25,26,26,27,27,28,29,
		 29,30,30,30,31,32,32,33,33,33,
		 34,34,35,35,35,36,36,36,37,37, 
		 37,38,38,63
};

#endif  // BIARIDECOD_H_