ref: 1e2e146fe7ef2b968ab1d3acadd743e031833ece
dir: /src/sndrtool.c/
/* * 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); }