ref: 6763cba31dea9a680d10d085e5e8e3f04e8cf3ce
dir: /src/8svx.c/
/*
* Amiga 8SVX format handler: W V Neisius, February 1992
*/
#include "sox_i.h"
#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
/* Private data used by writer */
typedef struct svxpriv {
uint32_t nsamples;
FILE *ch[4];
}*svx_t;
static void svxwriteheader(sox_format_t *, sox_size_t);
/*======================================================================*/
/* 8SVXSTARTREAD */
/*======================================================================*/
static int startread(sox_format_t * ft)
{
svx_t p = (svx_t ) ft->priv;
char buf[12];
char *chunk_buf;
uint32_t totalsize;
uint32_t chunksize;
uint32_t channels, i;
unsigned short rate;
off_t chan1_pos;
if (! ft->seekable)
{
sox_fail_errno(ft,SOX_EINVAL,"8svx input file must be a file, not a pipe");
return (SOX_EOF);
}
rate = 0;
channels = 1;
/* read FORM chunk */
if (sox_reads(ft, buf, 4) == SOX_EOF || strncmp(buf, "FORM", 4) != 0)
{
sox_fail_errno(ft, SOX_EHDR, "Header did not begin with magic word 'FORM'");
return(SOX_EOF);
}
sox_readdw(ft, &totalsize);
if (sox_reads(ft, buf, 4) == SOX_EOF || strncmp(buf, "8SVX", 4) != 0)
{
sox_fail_errno(ft, SOX_EHDR, "'FORM' chunk does not specify '8SVX' as type");
return(SOX_EOF);
}
/* read chunks until 'BODY' (or end) */
while (sox_reads(ft, buf, 4) == SOX_SUCCESS && strncmp(buf,"BODY",4) != 0) {
if (strncmp(buf,"VHDR",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize != 20)
{
sox_fail_errno(ft, SOX_EHDR, "VHDR chunk has bad size");
return(SOX_EOF);
}
sox_seeki(ft,12,SEEK_CUR);
sox_readw(ft, &rate);
sox_seeki(ft,1,SEEK_CUR);
sox_readbuf(ft, buf,1);
if (buf[0] != 0)
{
sox_fail_errno(ft, SOX_EFMT, "Unsupported data compression");
return(SOX_EOF);
}
sox_seeki(ft,4,SEEK_CUR);
continue;
}
if (strncmp(buf,"ANNO",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) xmalloc(chunksize + 2);
if (sox_readbuf(ft, chunk_buf,(size_t)chunksize)
!= chunksize)
{
sox_fail_errno(ft, SOX_EHDR, "Couldn't read all of header");
return(SOX_EOF);
}
chunk_buf[chunksize] = '\0';
sox_debug("%s",chunk_buf);
free(chunk_buf);
continue;
}
if (strncmp(buf,"NAME",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) xmalloc(chunksize + 1);
if (sox_readbuf(ft, chunk_buf,(size_t)chunksize)
!= chunksize)
{
sox_fail_errno(ft, SOX_EHDR, "Couldn't read all of header");
return(SOX_EOF);
}
chunk_buf[chunksize] = '\0';
sox_debug("%s",chunk_buf);
free(chunk_buf);
continue;
}
if (strncmp(buf,"CHAN",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize != 4)
{
sox_fail_errno(ft, SOX_EHDR, "Couldn't read all of header");
return(SOX_EOF);
}
sox_readdw(ft, &channels);
channels = (channels & 0x01) +
((channels & 0x02) >> 1) +
((channels & 0x04) >> 2) +
((channels & 0x08) >> 3);
continue;
}
/* some other kind of chunk */
sox_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
sox_seeki(ft,(int32_t)chunksize,SEEK_CUR);
continue;
}
if (rate == 0)
{
sox_fail_errno(ft, SOX_ERATE, "Invalid sample rate");
return(SOX_EOF);
}
if (strncmp(buf,"BODY",4) != 0)
{
sox_fail_errno(ft, SOX_EHDR, "BODY chunk not found");
return(SOX_EOF);
}
sox_readdw(ft, &(p->nsamples));
ft->length = p->nsamples;
ft->signal.channels = channels;
ft->signal.rate = rate;
ft->encoding.encoding = SOX_ENCODING_SIGN2;
ft->encoding.bits_per_sample = 8;
/* open files to channels */
p->ch[0] = ft->fp;
chan1_pos = sox_tell(ft);
for (i = 1; i < channels; i++) {
if ((p->ch[i] = fopen(ft->filename, "rb")) == NULL)
{
sox_fail_errno(ft,errno,"Can't open channel file '%s'",
ft->filename);
return(SOX_EOF);
}
/* position channel files */
if (fseeko(p->ch[i],chan1_pos,SEEK_SET))
{
sox_fail_errno (ft,errno,"Can't position channel %d",i);
return(SOX_EOF);
}
if (fseeko(p->ch[i],(off_t)(p->nsamples/channels*i),SEEK_CUR))
{
sox_fail_errno (ft,errno,"Can't seek channel %d",i);
return(SOX_EOF);
}
}
return(SOX_SUCCESS);
}
/*======================================================================*/
/* 8SVXREAD */
/*======================================================================*/
static sox_size_t read_samples(sox_format_t * ft, sox_sample_t *buf, sox_size_t nsamp)
{
unsigned char datum;
size_t done = 0, i;
svx_t p = (svx_t ) ft->priv;
while (done < nsamp) {
for (i = 0; i < ft->signal.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++ = SOX_SIGNED_8BIT_TO_SAMPLE(datum,);
}
done += ft->signal.channels;
}
return done;
}
/*======================================================================*/
/* 8SVXSTOPREAD */
/*======================================================================*/
static int stopread(sox_format_t * ft)
{
size_t i;
svx_t p = (svx_t ) ft->priv;
/* close channel files */
for (i = 1; i < ft->signal.channels; i++) {
fclose (p->ch[i]);
}
return(SOX_SUCCESS);
}
/*======================================================================*/
/* 8SVXSTARTWRITE */
/*======================================================================*/
static int startwrite(sox_format_t * ft)
{
svx_t p = (svx_t ) ft->priv;
size_t i;
/* open channel output files */
p->ch[0] = ft->fp;
for (i = 1; i < ft->signal.channels; i++) {
if ((p->ch[i] = tmpfile()) == NULL)
{
sox_fail_errno(ft,errno,"Can't open channel output file");
return(SOX_EOF);
}
}
/* write header (channel 0) */
p->nsamples = 0;
svxwriteheader(ft, p->nsamples);
return(SOX_SUCCESS);
}
/*======================================================================*/
/* 8SVXWRITE */
/*======================================================================*/
static sox_size_t write_samples(sox_format_t * ft, const sox_sample_t *buf, sox_size_t len)
{
svx_t p = (svx_t ) ft->priv;
unsigned char datum;
size_t done = 0, i;
p->nsamples += len;
while(done < len) {
for (i = 0; i < ft->signal.channels; i++) {
datum = SOX_SAMPLE_TO_SIGNED_8BIT(*buf++, ft->clips);
/* FIXME: Needs to pass ft struct and not FILE */
putc(datum, p->ch[i]);
}
done += ft->signal.channels;
}
return (done);
}
/*======================================================================*/
/* 8SVXSTOPWRITE */
/*======================================================================*/
static int stopwrite(sox_format_t * ft)
{
svx_t p = (svx_t ) ft->priv;
size_t i, len;
char svxbuf[512];
/* append all channel pieces to channel 0 */
/* close temp files */
for (i = 1; i < ft->signal.channels; i++) {
if (fseeko(p->ch[i], (off_t)0, 0))
{
sox_fail_errno (ft,errno,"Can't rewind channel output file %d",i);
return(SOX_EOF);
}
while (!feof(p->ch[i])) {
len = fread(svxbuf, 1, 512, p->ch[i]);
if (fwrite (svxbuf, 1, len, p->ch[0]) != len) {
sox_fail_errno (ft,errno,"Can't write channel output file %d",i);
return SOX_EOF;
}
}
fclose (p->ch[i]);
}
/* add a pad byte if BODY size is odd */
if(p->nsamples % 2 != 0)
sox_writeb(ft, '\0');
/* fixup file sizes in header */
if (sox_seeki(ft, 0, 0) != 0)
{
sox_fail_errno(ft,errno,"can't rewind output file to rewrite 8SVX header");
return(SOX_EOF);
}
svxwriteheader(ft, p->nsamples);
return(SOX_SUCCESS);
}
/*======================================================================*/
/* 8SVXWRITEHEADER */
/*======================================================================*/
#define SVXHEADERSIZE 100
static void svxwriteheader(sox_format_t * ft, sox_size_t nsamples)
{
sox_size_t formsize = nsamples + SVXHEADERSIZE - 8;
/* FORM size must be even */
if(formsize % 2 != 0) formsize++;
sox_writes(ft, "FORM");
sox_writedw(ft, formsize); /* size of file */
sox_writes(ft, "8SVX"); /* File type */
sox_writes(ft, "VHDR");
sox_writedw(ft, 20); /* number of bytes to follow */
sox_writedw(ft, nsamples/ft->signal.channels); /* samples, 1-shot */
sox_writedw(ft, 0); /* samples, repeat */
sox_writedw(ft, 0); /* samples per repeat cycle */
sox_writew(ft, (uint16_t)ft->signal.rate); /* samples per second */
sox_writeb(ft,1); /* number of octabes */
sox_writeb(ft,0); /* data compression (none) */
sox_writew(ft,1); sox_writew(ft,0); /* volume */
sox_writes(ft, "ANNO");
sox_writedw(ft, 32); /* length of block */
sox_writes(ft, "File created by Sound Exchange ");
sox_writes(ft, "CHAN");
sox_writedw(ft, 4);
sox_writedw(ft, (ft->signal.channels == 2) ? 6u :
(ft->signal.channels == 4) ? 15u : 2u);
sox_writes(ft, "BODY");
sox_writedw(ft, nsamples); /* samples in file */
}
SOX_FORMAT_HANDLER(svx)
{
static char const * const names[] = {"8svx", NULL};
static unsigned const write_encodings[] = {SOX_ENCODING_SIGN2, 8, 0, 0};
static sox_format_handler_t const handler = {
"Amiga audio format (a subformat of the Interchange File Format)",
names, SOX_FILE_BIG_END|SOX_FILE_MONO|SOX_FILE_STEREO|SOX_FILE_QUAD,
startread, read_samples, stopread,
startwrite, write_samples, stopwrite,
NULL, write_encodings, NULL
};
return &handler;
}