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/*
* Sounder/Sndtool format handler: W V Neisius, February 1992
*
* June 28, 93: force output to mono.
*
* March 3, 1999 - cbagwell@sprynet.com
* Forced extra comment fields to zero.
*/
#include <math.h>
#include <string.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* For SEEK_* defines if not found in stdio */
#endif
#include "st.h"
/* Private data used by writer */
struct sndpriv {
ULONG nsamples;
};
#ifndef SEEK_CUR
#define SEEK_CUR 1
#endif
void sndtwriteheader(P2(ft_t ft,LONG nsamples));
void rawwrite(P3(ft_t, LONG *, LONG));
/*======================================================================*/
/* SNDSTARTREAD */
/*======================================================================*/
void sndtstartread(ft)
ft_t ft;
{
char buf[97];
LONG rate;
int littlendian = 1;
char *endptr;
/* Needed for rawread() */
rawstartread(ft);
endptr = (char *) &littlendian;
/* sndt is in little endian format so
* swap bytes on big endian machines.
*/
if (!*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
rate = 0;
/* determine file type */
/* if first 5 bytes == SOUND then this is probably a sndtool sound */
/* if first word (16 bits) == 0
and second word is between 4000 & 25000 then this is sounder sound */
/* otherwise, its probably raw, not handled here */
if (fread(buf, 1, 2, ft->fp) != 2)
fail("SND: unexpected EOF");
if (strncmp(buf,"\0\0",2) == 0)
{
/* sounder */
rate = rshort(ft);
if (rate < 4000 || rate > 25000 )
fail ("SND: sample rate out of range");
fseek(ft->fp,4,SEEK_CUR);
}
else
{
/* sndtool ? */
fread(&buf[2],1,6,ft->fp);
if (strncmp(buf,"SOUND",5))
fail ("SND: unrecognized SND format");
fseek(ft->fp,12,SEEK_CUR);
rate = rshort(ft);
fseek(ft->fp,6,SEEK_CUR);
if (fread(buf,1,96,ft->fp) != 96)
fail ("SND: unexpected EOF in SND header");
report ("%s",buf);
}
ft->info.channels = 1;
ft->info.rate = rate;
ft->info.style = UNSIGNED;
ft->info.size = BYTE;
}
/*======================================================================*/
/* SNDTSTARTWRITE */
/*======================================================================*/
void sndtstartwrite(ft)
ft_t ft;
{
struct sndpriv *p = (struct sndpriv *) ft->priv;
int littlendian = 1;
char *endptr;
/* Needed for rawwrite() */
rawstartwrite(ft);
endptr = (char *) &littlendian;
/* sndt is in little endian format so
* swap bytes on big endian machines
*/
if (!*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
/* write header */
ft->info.channels = 1;
ft->info.style = UNSIGNED;
ft->info.size = BYTE;
p->nsamples = 0;
sndtwriteheader(ft, 0);
}
/*======================================================================*/
/* SNDRSTARTWRITE */
/*======================================================================*/
void sndrstartwrite(ft)
ft_t ft;
{
int littlendian = 1;
char *endptr;
/* Needed for rawread() */
rawstartread(ft);
endptr = (char *) &littlendian;
/* sndr is in little endian format so
* swap bytes on big endian machines
*/
if (!*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
/* write header */
ft->info.channels = 1;
ft->info.style = UNSIGNED;
ft->info.size = BYTE;
/* sounder header */
wshort (ft,0); /* sample size code */
wshort (ft,(int) ft->info.rate); /* sample rate */
wshort (ft,10); /* volume */
wshort (ft,4); /* shift */
}
/*======================================================================*/
/* SNDTWRITE */
/*======================================================================*/
void sndtwrite(ft, buf, len)
ft_t ft;
LONG *buf, len;
{
struct sndpriv *p = (struct sndpriv *) ft->priv;
p->nsamples += len;
rawwrite(ft, buf, len);
}
/*======================================================================*/
/* SNDTSTOPWRITE */
/*======================================================================*/
void sndtstopwrite(ft)
ft_t ft;
{
struct sndpriv *p = (struct sndpriv *) ft->priv;
/* Flush remaining buffer out */
rawstopwrite(ft);
/* fixup file sizes in header */
if (fseek(ft->fp, 0L, 0) != 0)
fail("can't rewind output file to rewrite SND header");
sndtwriteheader(ft, p->nsamples);
}
/*======================================================================*/
/* SNDTWRITEHEADER */
/*======================================================================*/
void sndtwriteheader(ft,nsamples)
ft_t ft;
LONG nsamples;
{
char name_buf[97];
/* sndtool header */
fputs ("SOUND",ft->fp); /* magic */
fputc (0x1a,ft->fp);
wshort (ft,(LONG)0); /* hGSound */
wlong (ft,nsamples);
wlong (ft,(LONG)0);
wlong (ft,nsamples);
wshort (ft,(int) ft->info.rate);
wshort (ft,0);
wshort (ft,10);
wshort (ft,4);
memset (name_buf, 0, 96);
sprintf (name_buf,"%s - File created by Sound Exchange",ft->filename);
fwrite (name_buf, 1, 96, ft->fp);
}
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