/********************************************************************** * 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 long 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_ARGSextern int read_huffcodetab(FILE *); 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*);#elseextern int read_huffcodetab(); extern int read_decoder_table(); extern void huffman_coder();extern int huffman_decoder();#endif