ref: 0644115219788089d88eecb75e14d5f6191564e4
dir: /src/8svx.c/
/*
* Amiga 8SVX format handler: W V Neisius, February 1992
*/
#include <math.h>
#include <errno.h>
#include <string.h>
#include <stdlib.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 svxpriv {
ULONG nsamples;
FILE *ch[4];
};
static void svxwriteheader(P2(ft_t, LONG));
/*======================================================================*/
/* 8SVXSTARTREAD */
/*======================================================================*/
int st_svxstartread(ft)
ft_t ft;
{
struct svxpriv *p = (struct svxpriv *) ft->priv;
char buf[12];
char *chunk_buf;
ULONG totalsize;
ULONG chunksize;
ULONG channels;
unsigned short rate;
int i;
int littlendian = 1;
char *endptr;
ULONG chan1_pos;
endptr = (char*) &littlendian;
/* 8svx is in big endian format. Swap whats
* read in on little endian machines.
*/
if (*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
rate = 0;
channels = 1;
/* read FORM chunk */
if (st_reads(ft, buf, 4) == ST_EOF || strncmp(buf, "FORM", 4) != 0)
{
fail("8SVX: header does not begin with magic word 'FORM'");
return(ST_EOF);
}
st_readdw(ft, &totalsize);
if (st_reads(ft, buf, 4) == ST_EOF || strncmp(buf, "8SVX", 4) != 0)
{
fail("8SVX: 'FORM' chunk does not specify '8SVX' as type");
return(ST_EOF);
}
/* read chunks until 'BODY' (or end) */
while (st_reads(ft, buf, 4) == ST_SUCCESS && strncmp(buf,"BODY",4) != 0) {
if (strncmp(buf,"VHDR",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize != 20)
{
fail ("8SVX: VHDR chunk has bad size");
return(ST_EOF);
}
fseek(ft->fp,12,SEEK_CUR);
st_readw(ft, &rate);
fseek(ft->fp,1,SEEK_CUR);
fread(buf,1,1,ft->fp);
if (buf[0] != 0)
{
fail ("8SVX: unsupported data compression");
return(ST_EOF);
}
fseek(ft->fp,4,SEEK_CUR);
continue;
}
if (strncmp(buf,"ANNO",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) malloc(chunksize + 2);
if (chunk_buf == 0)
{
fail("Couldn't alloc resources");
return(ST_EOF);
}
if (fread(chunk_buf,1,(size_t)chunksize,ft->fp)
!= chunksize)
{
fail("8SVX: Unexpected EOF in ANNO header");
return(ST_EOF);
}
chunk_buf[chunksize] = '\0';
report ("%s",chunk_buf);
free(chunk_buf);
continue;
}
if (strncmp(buf,"NAME",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) malloc(chunksize + 1);
if (chunk_buf == 0)
{
fail("Couldn't alloc resources");
return(ST_EOF);
}
if (fread (chunk_buf,1,(size_t)chunksize,ft->fp)
!= chunksize)
{
fail("8SVX: Unexpected EOF in NAME header");
return(ST_EOF);
}
chunk_buf[chunksize] = '\0';
report ("%s",chunk_buf);
free(chunk_buf);
continue;
}
if (strncmp(buf,"CHAN",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize != 4)
{
fail("8SVX: Short channel chunk");
return(ST_EOF);
}
st_readdw(ft, &channels);
channels = (channels & 0x01) +
((channels & 0x02) >> 1) +
((channels & 0x04) >> 2) +
((channels & 0x08) >> 3);
continue;
}
/* some other kind of chunk */
st_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
fseek(ft->fp,chunksize,SEEK_CUR);
continue;
}
if (rate == 0)
{
fail ("8SVX: invalid rate");
return(ST_EOF);
}
if (strncmp(buf,"BODY",4) != 0)
{
fail ("8SVX: BODY chunk not found");
return(ST_EOF);
}
st_readdw(ft, &(p->nsamples));
ft->info.channels = channels;
ft->info.rate = rate;
ft->info.encoding = ST_ENCODING_SIGN2;
ft->info.size = ST_SIZE_BYTE;
/* open files to channels */
p->ch[0] = ft->fp;
chan1_pos = ftell(p->ch[0]);
for (i = 1; i < channels; i++) {
if ((p->ch[i] = fopen(ft->filename, READBINARY)) == NULL)
{
fail("Can't open channel file '%s': %s",
ft->filename, strerror(errno));
return(ST_EOF);
}
/* position channel files */
if (fseek(p->ch[i],chan1_pos,SEEK_SET))
{
fail ("Can't position channel %d: %s",i,strerror(errno));
return(ST_EOF);
}
if (fseek(p->ch[i],p->nsamples/channels*i,SEEK_CUR))
{
fail ("Can't seek channel %d: %s",i,strerror(errno));
return(ST_EOF);
}
}
return(ST_SUCCESS);
}
/*======================================================================*/
/* 8SVXREAD */
/*======================================================================*/
LONG st_svxread(ft, buf, nsamp)
ft_t ft;
LONG *buf, nsamp;
{
unsigned char datum;
int done = 0;
int i;
struct svxpriv *p = (struct svxpriv *) ft->priv;
while (done < nsamp) {
for (i = 0; i < ft->info.channels; i++) {
/* FIXME: don't pass FILE pointers! */
datum = getc(p->ch[i]);
if (feof(p->ch[i]))
return done;
/* scale signed up to long's range */
*buf++ = LEFT(datum, 24);
}
done += ft->info.channels;
}
return done;
}
/*======================================================================*/
/* 8SVXSTOPREAD */
/*======================================================================*/
int st_svxstopread(ft)
ft_t ft;
{
int i;
struct svxpriv *p = (struct svxpriv *) ft->priv;
/* close channel files */
for (i = 1; i < ft->info.channels; i++) {
fclose (p->ch[i]);
}
return(ST_SUCCESS);
}
/*======================================================================*/
/* 8SVXSTARTWRITE */
/*======================================================================*/
int st_svxstartwrite(ft)
ft_t ft;
{
struct svxpriv *p = (struct svxpriv *) ft->priv;
int i;
int littlendian = 1;
char *endptr;
endptr = (char *) &littlendian;
/* 8svx is in big endian format. Swaps wahst
* read in on little endian machines.
*/
if (*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
/* open channel output files */
p->ch[0] = ft->fp;
for (i = 1; i < ft->info.channels; i++) {
if ((p->ch[i] = tmpfile()) == NULL)
{
fail("Can't open channel output file: %s",
strerror(errno));
return(ST_EOF);
}
}
/* write header (channel 0) */
ft->info.encoding = ST_ENCODING_SIGN2;
ft->info.size = ST_SIZE_BYTE;
p->nsamples = 0;
svxwriteheader(ft, p->nsamples);
return(ST_SUCCESS);
}
/*======================================================================*/
/* 8SVXWRITE */
/*======================================================================*/
LONG st_svxwrite(ft, buf, len)
ft_t ft;
LONG *buf, len;
{
struct svxpriv *p = (struct svxpriv *) ft->priv;
unsigned char datum;
int done = 0;
int i;
p->nsamples += len;
while(done < len) {
for (i = 0; i < ft->info.channels; i++) {
datum = RIGHT(*buf++, 24);
/* FIXME: Needs to pass ft struct and not FILE */
putc(datum, p->ch[i]);
}
done += ft->info.channels;
}
return (done);
}
/*======================================================================*/
/* 8SVXSTOPWRITE */
/*======================================================================*/
int st_svxstopwrite(ft)
ft_t ft;
{
struct svxpriv *p = (struct svxpriv *) ft->priv;
int i;
int len;
char svxbuf[512];
/* append all channel pieces to channel 0 */
/* close temp files */
for (i = 1; i < ft->info.channels; i++) {
if (fseek (p->ch[i], 0L, 0))
{
fail ("Can't rewind channel output file %d",i);
return(ST_EOF);
}
while (!feof(p->ch[i])) {
len = fread (svxbuf, 1, 512, p->ch[i]);
fwrite (svxbuf, 1, len, p->ch[0]);
}
fclose (p->ch[i]);
}
/* add a pad byte if BODY size is odd */
if(p->nsamples % 2 != 0)
st_writeb(ft, '\0');
/* fixup file sizes in header */
if (fseek(ft->fp, 0L, 0) != 0)
{
fail("can't rewind output file to rewrite 8SVX header");
return(ST_EOF);
}
svxwriteheader(ft, p->nsamples);
return(ST_SUCCESS);
}
/*======================================================================*/
/* 8SVXWRITEHEADER */
/*======================================================================*/
#define SVXHEADERSIZE 100
static void svxwriteheader(ft,nsamples)
ft_t ft;
LONG nsamples;
{
LONG formsize = nsamples + SVXHEADERSIZE - 8;
/* FORM size must be even */
if(formsize % 2 != 0) formsize++;
st_writes(ft, "FORM");
st_writedw(ft, formsize); /* size of file */
st_writes(ft, "8SVX"); /* File type */
st_writes(ft, "VHDR");
st_writedw(ft, (LONG) 20); /* number of bytes to follow */
st_writedw(ft, nsamples); /* samples, 1-shot */
st_writedw(ft, (LONG) 0); /* samples, repeat */
st_writedw(ft, (LONG) 0); /* samples per repeat cycle */
st_writew(ft, (int) ft->info.rate); /* samples per second */
st_writeb(ft,1); /* number of octabes */
st_writeb(ft,0); /* data compression (none) */
st_writew(ft,1); st_writew(ft,0); /* volume */
st_writes(ft, "ANNO");
st_writedw(ft, (LONG) 32); /* length of block */
st_writes(ft, "File created by Sound Exchange ");
st_writes(ft, "CHAN");
st_writedw(ft, (LONG) 4);
st_writedw(ft, (ft->info.channels == 2) ? (LONG) 6 :
(ft->info.channels == 4) ? (LONG) 15 : (LONG) 2);
st_writes(ft, "BODY");
st_writedw(ft, nsamples); /* samples in file */
}