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/* huffman.h 
 
	Adapted from the ISO MPEG Audio Subgroup Software Simulation 
   Group's public c source for its MPEG audio decoder. Miscellaneous 
   changes by Jeff Tsay (ctsay@pasteur.eecs.berkeley.edu). 
 
   Last modified : 04/19/97 */ 
 
/********************************************************************** 
Copyright (c) 1991 MPEG/audio software simulation group, All Rights Reserved 
huffman.h 
**********************************************************************/ 
/********************************************************************** 
 * MPEG/audio coding/decoding software, work in progress              * 
 *   NOT for public distribution until verified and approved by the   * 
 *   MPEG/audio committee.  For further information, please contact   * 
 *   Davis Pan, 508-493-2241, e-mail: pan@3d.enet.dec.com             * 
 *                                                                    * 
 * VERSION 4.1                                                        * 
 *   changes made since last update:                                  * 
 *   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				      											 * 
 *********************************************************************/ 
 
#ifndef HUFFMAN_H 
#define HUFFMAN_H 
 
#include "all.h" 
#include "bit_res.h" 
 
#define HUFFBITS uint32 
#define HTN	34 
#define MXOFF	250 
 
struct huffcodetab { 
  char tablename[3];			/* string, containing table_description   */ 
  uint32 xlen; 				/* max. x-index+			      	         */ 
  uint32 ylen;	            /* max. y-index+				               */ 
  uint32 linbits; 			/* number of linbits			               */ 
  uint32 linmax;				/* max number to be stored in linbits	   */ 
  int32 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				               */ 
  uint32 treelen;				/* length of decoder tree		            */ 
}; 
 
extern struct huffcodetab ht[HTN]; 
 
int32 huffman_decoder(struct huffcodetab *h, int32 *x, int32 *y, int32 *v, 
                      int32 *w, Bit_Reserve *br); 
 
#endif