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

/*------------ Telecommunications & Signal Processing Lab -------------- 
                         McGill University 
 
Routine: 
  AIpar.h 
 
Description: 
  Declarations for AIFF and AIFF-C audio file headers 
 
Author / revision: 
  P. Kabal  Copyright (C) 1999 
  $Revision: 1.16 $  $Date: 1999/06/03 13:13:13 $ 
 
----------------------------------------------------------------------*/ 
 
#ifndef AIpar_h_ 
#define AIpar_h_ 
 
#include 		/* typedef for uint2_t, etc */ 
 
/* AIFF or AIFF-C file layout 
  FORM chunk           8 + 4 + FVER/COMM/SSND chunks 
  FVER chunk           8 + 4  (AIFF-C files only) 
  COMM chunk           8 + 18 + compressionType (4 bytes) 
                         + compressionName (min length 2) 
  SSND chunk           8 + 8 + data 
 
  AIFF files do not have the compressionType and compressionName fields in the 
  COMM chunk.  The minimum length AIFF file is 54 bytes long; the minimum 
  length AIFF-C file is 72 bytes long. 
*/ 
 
/* File magic in file byte order */ 
#define FM_IFF		"FORM" 
#  define FM_AIFF	"AIFF" 
#  define FM_AIFF_C	"AIFC" 
#define CKID_COMM	"COMM" 
#define CKID_FVER	"FVER" 
#define CKID_SSND	"SSND" 
#define CKID_NAME	"NAME" 
#define CKID_AUTHOR	"AUTH" 
#define CKID_COPYRIGHT	"(c) " 
#define CKID_ANNOTATION	"ANNO" 
 
#define CT_NONE		"NONE" 
#define CT_ALAW		"alaw" 
#define CT_ULAW		"ulaw" 
#define CT_FLOAT32	"fl32" 
#define CT_FLOAT64	"fl64" 
 
#define CT_ADP4		"ADP4"	/* DVI ADPCM */ 
#define CT_DWVW		"DWVW"	/* TX16W Typhoon */ 
#define CT_FL32		"FL32"	/* Csound Float 32 */ 
#define CT_IMA4		"ima4"	/* IMA */ 
#define CT_MAC3		"MAC3"	/* Apple MACE 3-to-1 */ 
#define CT_MAC6		"MAC6"	/* Appple MACE 6-to-1 */ 
#define CT_QDMC		"QDMC"	/* QDesign Music */ 
#define CT_QCLP		"Qclp"	/* Qualcomm PureVoice */ 
#define CT_RT24		"rt24"	/* Voxware RT24 */ 
#define CT_RT29		"rt29"	/* Voxware RT29 */ 
 
#define CT_X_ALAW	"ALAW"	/* "SGI CCITT G.711 A-law" */ 
#define CT_X_ULAW	"ULAW"	/* "SGI CCITT G.711 u-law" */ 
#define CT_G722		"G722"	/* "SGI CCITT G.722" */ 
#define CT_G726		"G726"	/* "CCITT G.726" */ 
#define CT_G728		"G728"	/* "CCITT G.728" */ 
#define CT_GSM		"GSM "	/* "GSM 06-10" */ 
 
/* Compression name strings (max CNAME_MAX characters) */ 
#define CNAME_MAX	32 
#define CN_NONE		"not compressed" 
#define CN_ULAW		"\265law 2:1" 
#define CN_ALAW		"Alaw 2:1" 
#define CN_FLOAT32	"IEEE 32-bit float" 
#define CN_FLOAT64	"IEEE 64-bit float" 
#define CN_X_ALAW	"ITU-T G.711 A-law" 
#define CN_X_ULAW	"ITU-T G.711 mu-law" 
 
#define AI_SF_ULAW	(1.) 
#define AI_SF_ALAW	(1.) 
#define AI_SF_NONE8	(128.) 
#define AI_SF_NONE16	(1.) 
#define AI_SF_NONE24	(1./256.) 
#define AI_SF_NONE32	(1./65536.) 
#define AI_SF_FLOAT32	(32768.) 
#define AI_SF_FLOAT64	(32768.) 
 
#define AIFCVersion1	0xA2805140	/* AIFF-C Version 1 identifier */ 
 
struct AI_CkPreamb { 
  char ckID[4]; 
  uint4_t ckDataSize; 
}; 
 
struct AI_CkCOMM { 
  uint2_t numChannels; 
  uint4_t numSampleFrames; 
  uint2_t sampleSize; 
  unsigned char sampleRate[10]; 
  char compressionType[4]; 
  char compressionName[CNAME_MAX+1];	/* Null terminated string */ 
}; 
 
struct AI_CkFVER { 
  uint4_t timestamp; 
}; 
 
struct AI_CkSSND { 
  uint4_t offset; 
  uint4_t blockSize; 
}; 
 
#endif	/* AIpar_h_ */