www.pudn.com > av3dec_20050318.zip > AUpar.h

/*------------ Telecommunications & Signal Processing Lab -------------- 
                         McGill University 
 
Routine: 
  AUpar.h 
 
Description: 
  Declarations for AU audio file headers 
 
Author / revision: 
  P. Kabal  Copyright (C) 1998 
  $Revision: 1.26 $  $Date: 1998/10/15 16:11:11 $ 
 
----------------------------------------------------------------------*/ 
 
#ifndef AUpar_h_ 
#define AUpar_h_ 
 
#include 		/* typedef for uint4_t */ 
 
/* The AU header size is mandated to be at least 28 bytes long (the last 4 
   bytes being comments).  However there are files extant which have only 24 
   byte headers. 
*/ 
#define AU_LHMIN	24 
 
/* File magic values in file byte order */ 
#define	FM_AU		".snd" 
 
enum { 
  AU_UNSPEC	= 0,	/* unspecified format */ 
  AU_MULAW8	= 1,	/* mu-law 8-bit data */ 
  AU_LIN8	= 2,	/* linear two's complement 8-bit data */ 
  AU_LIN16	= 3,	/* linear two's complement 16-bit data */ 
  AU_LIN24	= 4,	/* linear two's complement 24-bit data */ 
  AU_LIN32	= 5,	/* linear two's complement 32-bit data */ 
  AU_FLOAT32	= 6,	/* IEEE 32-bit float data (-1. to +1.) */ 
  AU_DOUBLE64	= 7,	/* IEEE 64-bit float data */ 
  AU_G721	= 23,	/* CCITT G.721 4-bit ADPCM */ 
  AU_G722	= 24,	/* CCITT G.722 */ 
  AU_G723_3	= 25,	/* CCITT G.723 3-bit ADPCM */ 
  AU_G723_5	= 26,	/* CCITT G.723 5-bit ADPCM */ 
  AU_ALAW8	= 27	/* A-law 8-bit data */ 
}; 
 
#define AU_SF_MULAW8	(1.) 
#define AU_SF_ALAW8	(1.) 
#define AU_SF_LIN8	(128.) 
#define AU_SF_LIN16	(1.) 
#define AU_SF_LIN24	(1./256.) 
#define AU_SF_LIN32	(1./65536.) 
#define AU_SF_FLOAT32	(32768.) 
#define AU_SF_DOUBLE64	(32768.) 
 
#define	AU_NOSIZE	(~((uint4_t) 0))	/* Indeterminate data length */ 
 
struct AU_head { 
  char Magic[4];	/* File magic */ 
  uint4_t Lhead;	/* Length of header in bytes */ 
  uint4_t Ldata;	/* Length of data portion in bytes */ 
  uint4_t Dencod;	/* Encoding type */ 
  uint4_t Srate;	/* Sampling rate */ 
  uint4_t Nchan;	/* Number of channels */ 
  char AFspID[4];	/* AFsp identifier */ 
}; 
 
#endif	/* AUpar_h_ */