www.pudn.com > bladeenc-0.90.0-src.zip > huffman.h

/* 
			(c) Copyright 1998, 1999 - Tord Jansson 
			======================================= 
 
		This file is part of the BladeEnc MP3 Encoder, based on 
		ISO's reference code for MPEG Layer 3 compression, and might 
		contain smaller or larger sections that are directly taken 
		from ISO's reference code. 
 
		All changes to the ISO reference code herein are either 
		copyrighted by Tord Jansson (tord.jansson@swipnet.se) 
		or sublicensed to Tord Jansson by a third party. 
 
	BladeEnc is free software; you can redistribute this file 
	and/or modify it under the terms of the GNU Lesser General Public 
	License as published by the Free Software Foundation; either 
	version 2.1 of the License, or (at your option) any later version. 
 
*/ 
 
#ifndef	HUFFMAN_DOT_H 
#define	HUFFMAN_DOT_H 
 
/********************************************************************** 
 * ISO MPEG Audio Subgroup Software Simulation Group (1996) 
 * ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension 
 * 
 * $Id: huffman.h,v 1.1 1996/02/14 04:04:23 rowlands Exp $ 
 * 
 * $Log: huffman.h,v $ 
 * Revision 1.1  1996/02/14 04:04:23  rowlands 
 * Initial revision 
 * 
 * Received from Mike Coleman 
 **********************************************************************/ 
/********************************************************************** 
 *   date   programmers                comment                        * 
 *  27.2.92 F.O.Witte (ITT Intermetall)				      * 
 *  8/24/93 M. Iwadare          Changed for 1 pass decoding.          * 
 *  7/14/94 J. Koller		useless 'typedef' before huffcodetab  * 
 *				removed				      * 
 *********************************************************************/	 
  
#define HUFFBITS unsigned int 
#define HTN	34 
#define MXOFF	250 
  
struct huffcodetab { 
  char tablename[3];	/*string, containing table_description	*/ 
  unsigned int xlen; 	/*max. x-index+			      	*/  
  unsigned int ylen;	/*max. y-index+				*/ 
  unsigned int linbits; /*number of linbits			*/ 
  unsigned int linmax;	/*max number to be stored in linbits	*/ 
  int ref;		/*a positive value indicates a reference*/ 
  HUFFBITS *table;	/*pointer to array[xlen][ylen]		*/ 
  unsigned char *hlen;	/*pointer to array[xlen][ylen]		*/ 
  unsigned char(*val)[2];/*decoder tree				*/  
  unsigned int treelen;	/*length of decoder tree		*/ 
}; 
 
extern struct huffcodetab ht[HTN];/* global memory block		*/ 
				/* array of all huffcodtable headers	*/ 
				/* 0..31 Huffman code table 0..31	*/ 
				/* 32,33 count1-tables			*/ 
#ifdef PROTO_ARGS 
 
extern int read_huffcodetab( void );  
extern int read_decoder_table(FILE *); 
  
extern void huffman_coder(unsigned int, unsigned int, 
			  struct huffcodetab *, Bit_stream_struc *); 
			   
extern int huffman_decoder(struct huffcodetab *, 
			   /* unsigned */ int *, /* unsigned */ int*, int*, int*); 
 
#else 
 
extern int read_huffcodetab();  
extern int read_decoder_table();  
extern void huffman_coder(); 
extern int huffman_decoder(); 
 
#endif 
 
 
 
#endif	/* HUFFMAN_DOT_H */