?? huffman.h
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/********************************************************************** * 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
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