biaridecod.h

Mobile IP VCEG的信道模拟程序

/***************************************************************************
 *
 * Module      :  biaridecod.h
 *
 * Authors     :  Detlev Marpe 
 *								Gabi Bl鋞termann 
 *              
 *
 * Date        :  21. Oct 2000
 *
 * Description :  Headerfile for 
 *								binary arithmetic
 *                decoder routines 
 *                
 *      Copyright (C) 2000 HEINRICH HERTZ INSTITUTE All Rights Reserved.
 *
 **************************************************************************
 */


#ifndef _BIARIDECOD_H_
#define _BIARIDECOD_H_

#define AAC_FRAC_TABLE 0  /* replaces division in the AC by a table lookup 
                             IMPORTANT NOTE: Should be changed according to 
                             the definition in the encoder */

/************************************************************************
 * C o n s t a n t s
 ***********************************************************************
 */

/* precision for arithmetic */
#define CODE_VALUE_BITS 16

/* 1/4  2/4  3/4  of interval */
#define FIRST_QTR 0x4000 //(1<<(CODE_VALUE_BITS-2))
#define HALF      0x8000 //(FIRST_QTR+FIRST_QTR)
#define THIRD_QTR 0xC000 //(HALF+FIRST_QTR)

/* maximum value of range */
#define TOP_VALUE 0xFFFF //((1<<CODE_VALUE_BITS)-1)    

#ifdef AAC_FRAC_TABLE

// ARITH_CUM_FREQ_TABLE[i]=(unsigned int)((pow(2,26)/i)+0.5);
const unsigned int ARITH_CUM_FREQ_TABLE[128] =
{
       0,        0, 33554432,  22369621,  16777216,  13421773,  11184811,  9586981,  8388608,  7456540,  
 6710886,  6100806,  5592405,   5162220,   4793490,   4473924,   4194304,  3947580,  3728270,  3532045,  
 3355443,  3195660,  3050403,   2917777,   2796203,   2684355,   2581110,  2485513,  2396745,  2314099,  
 2236962,  2164802,  2097152,   2033602,   1973790,   1917396,   1864135,  1813753,  1766023,  1720740,  
 1677722,  1636802,  1597830,   1560671,   1525201,   1491308,   1458888,  1427848,  1398101,  1369569,  
 1342177,  1315860,  1290555,   1266205,   1242757,   1220161,   1198373,  1177348,  1157049,  1137438,  
 1118481,  1100145,  1082401,   1065220,   1048576,   1032444,   1016801,  1001625,   986895,   972592,  
  958698,   945195,   932068,    919300,    906877,    894785,    883011,   871544,   860370,   849479,
  838861,   828504,   818401,    808541,    798915,    789516,    780336,   771366,   762601,   754032,
  745654,   737460,   729444,    721601,    713924,    706409,    699051,   691844,   684784,   677867,
  671089,   664444,   657930,    651542,    645278,    639132,    633102,   627186,   621378,   615678,
  610081,   604584,   599186,    593884,    588674,    583555,    578525,   573580,   568719,   563940,
  559241,   554619,   550073,    545601,    541201,    536871,    532610,   528416
};

#endif



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

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

//#define Dlow            (dep->Dlow)
//#define Dhigh           (dep->Dhigh)
//#define Dvalue          (dep->Dvalue)
#define Dbuffer         (dep->Dbuffer)
#define Dbits_to_go     (dep->Dbits_to_go)
#define Dcodestrm       (dep->Dcodestrm)
#define Dcodestrm_len   (dep->Dcodestrm_len)

#endif  /* BIARIDECOD_H */