ref: fa894e6a3fc1f13f494aaae3089b457eda96dfba
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> #ifdef VMS #include <perror.h> #endif #include "st.h" /* Private data used by writer */ struct svxpriv { ULONG nsamples; FILE *ch[4]; }; #ifndef SEEK_CUR #define SEEK_CUR 1 #endif #ifndef SEEK_SET #define SEEK_SET 0 #endif void svxwriteheader(P2(ft_t, LONG)); /*======================================================================*/ /* 8SVXSTARTREAD */ /*======================================================================*/ void svxstartread(ft) ft_t ft; { struct svxpriv *p = (struct svxpriv *) ft->priv; char buf[12]; char *endptr; char *chunk_buf; ULONG totalsize; ULONG chunksize; int channels; LONG rate; int littlendian = 0; int i; ULONG 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 */ /*======================================================================*/ LONG svxread(ft, buf, nsamp) ft_t ft; LONG *buf, nsamp; { ULONG 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 */ /*======================================================================*/ void 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 */ /*======================================================================*/ void 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 */ /*======================================================================*/ void svxwrite(ft, buf, len) ft_t ft; LONG *buf, len; { struct svxpriv *p = (struct svxpriv *) ft->priv; 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 */ /*======================================================================*/ void 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]); } /* add a pad byte if BODY size is odd */ if(p->nsamples % 2 != 0) fputc('\0', ft->fp); /* 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 void svxwriteheader(ft,nsamples) ft_t ft; LONG nsamples; { LONG formsize = nsamples + SVXHEADERSIZE - 8; /* FORM size must be even */ if(formsize % 2 != 0) formsize++; fputs ("FORM", ft->fp); wblong(ft, formsize); /* 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 */ }