ac.hpp

《Visual C++小波变换技术与工程实践》靳济芳编著的光盘程序。

/* $Id: ac.h,v 1.14 1998/05/19 15:35:37 hjlee Exp $ */

/****************************************************************************/
/*   MPEG4 Visual Texture Coding (VTC) Mode Software                        */
/*                                                                          */
/*   This software was jointly developed by the following participants:     */
/*                                                                          */
/*   Single-quant,  multi-quant and flow control                            */
/*   are provided by  Sarnoff Corporation                                   */
/*     Iraj Sodagar   ([e-mail])                                    */
/*     Hung-Ju Lee    ([e-mail])                                   */
/*     Paul Hatrack   ([e-mail])                                 */
/*     Shipeng Li     ([e-mail])                                 */
/*     Bing-Bing Chai ([e-mail])                                   */
/*     B.S. Srinivas  ([e-mail])                               */
/*                                                                          */
/*   Bi-level is provided by Texas Instruments                              */
/*     Jie Liang      ([e-mail])                                        */
/*                                                                          */
/*   Shape Coding is provided by  OKI Electric Industry Co., Ltd.           */
/*     Zhixiong Wu    ([e-mail])                                 */
/*     Yoshihiro Ueda ([e-mail])                               */
/*     Toshifumi Kanamaru ([e-mail])                        */
/*                                                                          */
/*   OKI, Sharp, Sarnoff, TI and Microsoft contributed to bitstream         */
/*   exchange and bug fixing.                                               */
/*                                                                          */
/*                                                                          */
/* In the course of development of the MPEG-4 standard, this software       */
/* module is an implementation of a part of one or more MPEG-4 tools as     */
/* specified by the MPEG-4 standard.                                        */
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/* conformance to the MPEG-4 standard.                                      */
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/* for standardization activity within ISO/IEC JTC1/SC29/WG11.              */
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/* Copyright 1995, 1996, 1997, 1998 ISO/IEC                                 */
/****************************************************************************/

/************************************************************/
/*     Sarnoff Very Low Bit Rate Still Image Coder          */
/*     Copyright 1995, 1996, 1997, 1998 Sarnoff Corporation */
/************************************************************/

/************************************************************/
/*  Filename: ac.h                                          */
/*                                                          */
/*  Descriptions:                                           */
/*    This is the header file of ac.c containing arithmetic */
/*    coding routines.                                      */
/*                                                          */
/************************************************************/

#ifndef AC_HEADER
#define AC_HEADER

//#include <stdio.h>
#include "basic.hpp"

//changed by Sarnoff for error resilience, 3/5/99
//#define MAX_BUFFER 1024
#define MAX_BUFFER 10000
//end changed by Sarnoff for error resilience, 3/5/99

typedef struct {
  FILE *fp;
  long low;
  long high;
  long followBits;
  Int buffer;
  Int bitsLeft;
  long bitCount;
  UChar *bitstream;
  long  bitstreamLength;
} ac_encoder;

typedef struct {
  FILE *fp;
  long value;
  long low;
  long high;
  Int buffer;
  Int bitsLeft;
  UChar *bitstream;
  long bitCount;
  long  bitstream_ptr;
  Int  dc_band;
} ac_decoder;

typedef struct {
  Int nsym;   /* the number of symbols in the symbol set to be encoded */
  Int adapt;  /* 0 => non-adaptive, !0 => adaptive */
  Int inc;

  /* for zeroth and mixed order models only */
  UShort *freq;
  UShort *cfreq;

  UShort Max_frequency;

} ac_model;



#endif