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- /*
- * Amiga 8SVX format handler: W V Neisius, February 1992
- */
-
- #ifdef unix
- #include <sys/types.h>
- #endif
- #include <math.h>
- #include <errno.h>
- #ifdef VMS
- #include <perror.h>
- #endif
- #include "st.h"
-
- /* Private data used by writer */
- struct svxpriv {
- unsigned long nsamples;
- FILE *ch[4];
- };
-
- #ifndef SEEK_CUR
- #define SEEK_CUR 1
- #endif
- #ifndef SEEK_SET
- #define SEEK_SET 0
- #endif
-
- /*======================================================================*/
- /* 8SVXSTARTREAD */
- /*======================================================================*/
-
- svxstartread(ft)
- ft_t ft;
- {
- struct svxpriv *p = (struct svxpriv *) ft->priv;
-
- char buf[12];
- char *endptr;
- char *chunk_buf;
-
- unsigned long totalsize;
- unsigned long chunksize;
-
- int channels;
- long rate;
- int littlendian = 0;
- int i;
-
- unsigned long chan1_pos;
-
- rate = 0;
- channels = 1;
-
- /* read FORM chunk */
- if (fread(buf, 1, 4, ft->fp) != 4 || strncmp(buf, "FORM", 4) != 0)
- fail("8SVX: header does not begin with magic word 'FORM'");
- totalsize = rblong(ft);
- if (fread(buf, 1, 4, ft->fp) != 4 || strncmp(buf, "8SVX", 4) != 0)
- fail("8SVX: 'FORM' chunk does not specify '8SVX' as type");
-
- /* read chunks until 'BODY' (or end) */
- while (fread(buf,1,4,ft->fp) == 4 && strncmp(buf,"BODY",4) != 0) {
- if (strncmp(buf,"VHDR",4) == 0) {
- chunksize = rblong(ft);
- if (chunksize != 20)
- fail ("8SVX: VHDR chunk has bad size");
- fseek(ft->fp,12,SEEK_CUR);
- rate = rbshort(ft);
- fseek(ft->fp,1,SEEK_CUR);
- fread(buf,1,1,ft->fp);
- if (buf[0] != 0)
- fail ("8SVX: unsupported data compression");
- fseek(ft->fp,4,SEEK_CUR);
- continue;
- }
-
- if (strncmp(buf,"ANNO",4) == 0) {
- chunksize = rblong(ft);
- if (chunksize & 1)
- chunksize++;
- chunk_buf = (char *) malloc(chunksize + 1);
- if (fread(chunk_buf,1,(size_t)chunksize,ft->fp)
- != chunksize)
- fail("8SVX: Unexpected EOF in ANNO header");
- chunk_buf[chunksize] = '\0';
- report ("%s",chunk_buf);
- free(chunk_buf);
-
- continue;
- }
-
- if (strncmp(buf,"NAME",4) == 0) {
- chunksize = rblong(ft);
- if (chunksize & 1)
- chunksize++;
- chunk_buf = (char *) malloc(chunksize + 1);
- if (fread (chunk_buf,1,(size_t)chunksize,ft->fp)
- != chunksize)
- fail("8SVX: Unexpected EOF in NAME header");
- chunk_buf[chunksize] = '\0';
- report ("%s",chunk_buf);
- free(chunk_buf);
-
- continue;
- }
-
- if (strncmp(buf,"CHAN",4) == 0) {
- chunksize = rblong(ft);
- if (chunksize != 4)
- fail("8SVX: Short channel chunk");
- channels = rblong(ft);
- channels = (channels & 0x01) +
- ((channels & 0x02) >> 1) +
- ((channels & 0x04) >> 2) +
- ((channels & 0x08) >> 3);
-
- continue;
- }
-
- /* some other kind of chunk */
- chunksize = rblong(ft);
- if (chunksize & 1)
- chunksize++;
- fseek(ft->fp,chunksize,SEEK_CUR);
- continue;
-
- }
-
- if (rate == 0)
- fail ("8SVX: invalid rate");
- if (strncmp(buf,"BODY",4) != 0)
- fail ("8SVX: BODY chunk not found");
- p->nsamples = rblong(ft);
-
- ft->info.channels = channels;
- ft->info.rate = rate;
- ft->info.style = SIGN2;
- ft->info.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));
-
- /* position channel files */
- if (fseek(p->ch[i],chan1_pos,SEEK_SET))
- fail ("Can't position channel %d: %s",i,strerror(errno));
- if (fseek(p->ch[i],p->nsamples/channels*i,SEEK_CUR))
- fail ("Can't seek channel %d: %s",i,strerror(errno));
- }
-
-
- endptr = (char *) &littlendian;
- *endptr = 1;
- if (littlendian == 1)
- ft->swap = 1;
-
- }
-
- /*======================================================================*/
- /* 8SVXREAD */
- /*======================================================================*/
- svxread(ft, buf, nsamp)
- ft_t ft;
- long *buf, nsamp;
- {
- register unsigned long datum;
- int done = 0;
- int i;
-
- struct svxpriv *p = (struct svxpriv *) ft->priv;
-
- while (done < nsamp) {
- for (i = 0; i < ft->info.channels; i++) {
- 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 */
- /*======================================================================*/
- 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]);
- }
- }
-
- /*======================================================================*/
- /* 8SVXSTARTWRITE */
- /*======================================================================*/
- svxstartwrite(ft)
- ft_t ft;
- {
- struct svxpriv *p = (struct svxpriv *) ft->priv;
- int littlendian = 0;
- int i;
- char *endptr;
-
- /* 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));
- }
-
- /* write header (channel 0) */
- ft->info.style = SIGN2;
- ft->info.size = BYTE;
-
- p->nsamples = 0;
- svxwriteheader(ft, p->nsamples);
-
- endptr = (char *) &littlendian;
- *endptr = 1;
- if (littlendian == 1)
- ft->swap = 1;
- }
-
- /*======================================================================*/
- /* 8SVXWRITE */
- /*======================================================================*/
-
- svxwrite(ft, buf, len)
- ft_t ft;
- long *buf, len;
- {
- struct svxpriv *p = (struct svxpriv *) ft->priv;
-
- register long datum;
- int done = 0;
- int i;
-
- p->nsamples += len;
-
- while(done < len) {
- for (i = 0; i < ft->info.channels; i++) {
- datum = RIGHT(*buf++, 24);
- putc((int)datum, p->ch[i]);
- }
- done += ft->info.channels;
- }
- }
-
- /*======================================================================*/
- /* 8SVXSTOPWRITE */
- /*======================================================================*/
-
- 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);
- while (!feof(p->ch[i])) {
- len = fread (svxbuf, 1, 512, p->ch[i]);
- fwrite (svxbuf, 1, len, p->ch[0]);
- }
- fclose (p->ch[i]);
- }
-
- /* fixup file sizes in header */
- if (fseek(ft->fp, 0L, 0) != 0)
- fail("can't rewind output file to rewrite 8SVX header");
- svxwriteheader(ft, p->nsamples);
- }
-
- /*======================================================================*/
- /* 8SVXWRITEHEADER */
- /*======================================================================*/
- #define SVXHEADERSIZE 100
- svxwriteheader(ft,nsamples)
- ft_t ft;
- long nsamples;
- {
- fputs ("FORM", ft->fp);
- wblong(ft, nsamples + SVXHEADERSIZE - 8); /* size of file */
- fputs("8SVX", ft->fp); /* File type */
-
- fputs ("VHDR", ft->fp);
- wblong(ft, (long) 20); /* number of bytes to follow */
- wblong(ft, nsamples); /* samples, 1-shot */
- wblong(ft, (long) 0); /* samples, repeat */
- wblong(ft, (long) 0); /* samples per repeat cycle */
- wbshort(ft, (int) ft->info.rate); /* samples per second */
- fputc(1,ft->fp); /* number of octaves */
- fputc(0,ft->fp); /* data compression (none) */
- wbshort(ft,1); wbshort(ft,0); /* volume */
-
- fputs ("ANNO", ft->fp);
- wblong(ft, (long) 32); /* length of block */
- fputs ("File created by Sound Exchange ", ft->fp);
-
- fputs ("CHAN", ft->fp);
- wblong(ft, (long) 4);
- wblong(ft, (ft->info.channels == 2) ? (long) 6 :
- (ft->info.channels == 4) ? (long) 15 : (long) 2);
-
- fputs ("BODY", ft->fp);
- wblong(ft, nsamples); /* samples in file */
- }