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tools/sph2pipe_v2.5/sph_convert.h
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/*************************************************************
* sph_convert.h
*------------------------------------------------------------
* primary header file for sph_convert.c
* and other related .c files
*
* This takes care of all other necessary #include's, all program-wide
* #define's, all function declarations, and global variables
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifdef _SPH_CONVERT_MAIN_
#define GLOBAL
#else
#define GLOBAL extern
#endif
#define STD_BUF_SIZE 16384
#define PCM 2
#define ULAW 1
#define ALAW 5
#define UNKNOWN 0
/* relation of PCM, ULAW, ALAW values to sample size:
PCM & 3 == 2; ULAW & 3 == 1; ALAW & 3 == 1 */
/* Functions used by sph_convert & sph2pipe:
* all int functions return 0 for success, non-zero (1) for failure
*/
int doConversion( char *, char * ); /* isolates file i/o from main() */
int getUserOpts( int, char ** ); /* parses command-line options */
int readSphHeader( char * ); /* as the name implies... */
void writeSphHeader( void ); /* exits on error */
void writeAUHeader( void ); /* exits on error */
void writeRIFFHeader( void ); /* exits on error */
void writeAIFFHeader( void ); /* exits on error */
int shortenXtract( void ); /* handles data i/o for shortened files */
int copySamples( void ); /* handles data i/o for normal files */
void demux( int ); /* demultiplex 2-channel buffer in-place */
/* Global variables:
*/
GLOBAL char *def_outheader;
GLOBAL double totalsec;
GLOBAL int chancount, samptype, sampsize, sampcount, samprate, doshorten;
GLOBAL int chanout, typeout, sizeout, startout, endout, debug;
GLOBAL char *nativorder, *inporder, *outorder, *outheader;
GLOBAL char mesgbuf[512];
GLOBAL FILE *fpin, *fpout;
GLOBAL char *inpname, *outname;
GLOBAL char *inpbuf, *outbuf;
GLOBAL union {
char ch[2];
short int i2;
} short_order;
GLOBAL union {
char ch[4];
int i4;
} long_order;
/* The following "pseudo-typedefs" are adopted for the sake of
* working with Tony Robinson's "shorten" source code
*/
#undef uchar
#define uchar unsigned char
#undef schar
#define schar signed char
#undef ushort
#define ushort unsigned short
#undef ulong
#define ulong unsigned long
/* This routine, copied directly from Tony Robinson's "shorten"
* package, converts from ulaw to 16 bit linear.
*
* Craig Reese: IDA/Supercomputing Research Center
* 29 September 1989
*
* References:
* 1) CCITT Recommendation G.711 (very difficult to follow)
* 2) MIL-STD-188-113,"Interoperability and Performance Standards
* for Analog-to_Digital Conversion Techniques,"
* 17 February 1987
*
* Input: 8 bit ulaw sample
* Output: signed 16 bit linear sample
*
* Note: this version differs from Tony's (and Craig's?) by changing
* all the "int" declarations to "short int". It is commented out now,
* because a "ulaw2pcm" array of 256 short-int values is being used
* instead (see above); that lookup table was created using this code.
* [DG/LDC]
short int ulaw2pcm(char ulawbyte)
{
static int exp_lut[8] = { 0, 132, 396, 924, 1980, 4092, 8316, 16764 };
short int sign, exponent, mantissa, sample;
ulawbyte = ~ulawbyte;
sign = (ulawbyte & 0x80);
exponent = (ulawbyte >> 4) & 0x07;
mantissa = ulawbyte & 0x0F;
sample = exp_lut[exponent] + (mantissa << (exponent + 3));
if(sign != 0) sample = -sample;
return(sample);
}
*/
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