ref: 626967dd1b0976e95773b637ec32a679d6474b75
dir: /src/maud.c/
/*
* Sound Tools MAUD file format driver, by Lutz Vieweg 1993
*
* supports: mono and stereo, linear, a-law and u-law reading and writing
*
* Copyright 1998-2006 Chris Bagwell and SoX Contributors
* This source code is freely redistributable and may be used for
* any purpose. This copyright notice must be maintained.
* Lance Norskog And Sundry Contributors are not responsible for
* the consequences of using this software.
*/
#include "st_i.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* For SEEK_* defines if not found in stdio */
#endif
/* Private data for MAUD file */
struct maudstuff { /* max. 100 bytes!!!! */
uint32_t nsamples;
};
static void maudwriteheader(ft_t);
/*
* Do anything required before you start reading samples.
* Read file header.
* Find out sampling rate,
* size and encoding of samples,
* mono/stereo/quad.
*/
static int st_maudstartread(ft_t ft)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
char buf[12];
char *chunk_buf;
unsigned short bitpersam;
uint32_t nom;
unsigned short denom;
unsigned short chaninf;
uint32_t chunksize;
uint32_t trash32;
uint16_t trash16;
int rc;
/* Needed for rawread() */
rc = st_rawstartread(ft);
if (rc)
return rc;
/* read FORM chunk */
if (st_reads(ft, buf, 4) == ST_EOF || strncmp(buf, "FORM", 4) != 0)
{
st_fail_errno(ft,ST_EHDR,"MAUD: header does not begin with magic word 'FORM'");
return (ST_EOF);
}
st_readdw(ft, &trash32); /* totalsize */
if (st_reads(ft, buf, 4) == ST_EOF || strncmp(buf, "MAUD", 4) != 0)
{
st_fail_errno(ft,ST_EHDR,"MAUD: 'FORM' chunk does not specify 'MAUD' as type");
return(ST_EOF);
}
/* read chunks until 'BODY' (or end) */
while (st_reads(ft, buf, 4) == ST_SUCCESS && strncmp(buf,"MDAT",4) != 0) {
/*
buf[4] = 0;
st_debug("chunk %s",buf);
*/
if (strncmp(buf,"MHDR",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize != 8*4)
{
st_fail_errno(ft,ST_EHDR,"MAUD: MHDR chunk has bad size");
return(ST_EOF);
}
/* fseeko(ft->fp,12,SEEK_CUR); */
/* number of samples stored in MDAT */
st_readdw(ft, &(p->nsamples));
/* number of bits per sample as stored in MDAT */
st_readw(ft, &bitpersam);
/* number of bits per sample after decompression */
st_readw(ft, (unsigned short *)&trash16);
st_readdw(ft, &nom); /* clock source frequency */
st_readw(ft, &denom); /* clock devide */
if (denom == 0)
{
st_fail_errno(ft,ST_EHDR,"MAUD: frequency denominator == 0, failed");
return (ST_EOF);
}
ft->signal.rate = nom / denom;
st_readw(ft, &chaninf); /* channel information */
switch (chaninf) {
case 0:
ft->signal.channels = 1;
break;
case 1:
ft->signal.channels = 2;
break;
default:
st_fail_errno(ft,ST_EFMT,"MAUD: unsupported number of channels in file");
return (ST_EOF);
}
st_readw(ft, &chaninf); /* number of channels (mono: 1, stereo: 2, ...) */
if (chaninf != ft->signal.channels)
{
st_fail_errno(ft,ST_EFMT,"MAUD: unsupported number of channels in file");
return(ST_EOF);
}
st_readw(ft, &chaninf); /* compression type */
st_readdw(ft, &trash32); /* rest of chunk, unused yet */
st_readdw(ft, &trash32);
st_readdw(ft, &trash32);
if (bitpersam == 8 && chaninf == 0) {
ft->signal.size = ST_SIZE_BYTE;
ft->signal.encoding = ST_ENCODING_UNSIGNED;
}
else if (bitpersam == 8 && chaninf == 2) {
ft->signal.size = ST_SIZE_BYTE;
ft->signal.encoding = ST_ENCODING_ALAW;
}
else if (bitpersam == 8 && chaninf == 3) {
ft->signal.size = ST_SIZE_BYTE;
ft->signal.encoding = ST_ENCODING_ULAW;
}
else if (bitpersam == 16 && chaninf == 0) {
ft->signal.size = ST_SIZE_16BIT;
ft->signal.encoding = ST_ENCODING_SIGN2;
}
else
{
st_fail_errno(ft,ST_EFMT,"MAUD: unsupported compression type detected");
return(ST_EOF);
}
ft->comment = 0;
continue;
}
if (strncmp(buf,"ANNO",4) == 0) {
st_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) xmalloc(chunksize + 1);
if (st_readbuf(ft, chunk_buf, 1, (int)chunksize)
!= chunksize)
{
st_fail_errno(ft,ST_EOF,"MAUD: Unexpected EOF in ANNO header");
return(ST_EOF);
}
chunk_buf[chunksize] = '\0';
st_debug("%s",chunk_buf);
free(chunk_buf);
continue;
}
/* some other kind of chunk */
st_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
st_seeki(ft, chunksize, SEEK_CUR);
continue;
}
if (strncmp(buf,"MDAT",4) != 0)
{
st_fail_errno(ft,ST_EFMT,"MAUD: MDAT chunk not found");
return(ST_EOF);
}
st_readdw(ft, &(p->nsamples));
return(ST_SUCCESS);
}
static int st_maudstartwrite(ft_t ft)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
int rc;
/* Needed for rawwrite() */
rc = st_rawstartwrite(ft);
if (rc)
return rc;
/* If you have to seek around the output file */
if (! ft->seekable)
{
st_fail_errno(ft,ST_EOF,"Output .maud file must be a file, not a pipe");
return (ST_EOF);
}
if (ft->signal.channels != 1 && ft->signal.channels != 2) {
st_fail_errno(ft,ST_EFMT,"MAUD: unsupported number of channels, unable to store");
return(ST_EOF);
}
if (ft->signal.size == ST_SIZE_16BIT) ft->signal.encoding = ST_ENCODING_SIGN2;
if (ft->signal.encoding == ST_ENCODING_ULAW ||
ft->signal.encoding == ST_ENCODING_ALAW) ft->signal.size = ST_SIZE_BYTE;
if (ft->signal.size == ST_SIZE_BYTE &&
ft->signal.encoding == ST_ENCODING_SIGN2)
ft->signal.encoding = ST_ENCODING_UNSIGNED;
p->nsamples = 0x7f000000L;
maudwriteheader(ft);
p->nsamples = 0;
return (ST_SUCCESS);
}
static st_size_t st_maudwrite(ft_t ft, const st_sample_t *buf, st_size_t len)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
p->nsamples += len;
return st_rawwrite(ft, buf, len);
}
static int st_maudstopwrite(ft_t ft)
{
int rc;
/* Flush out remaining samples*/
rc = st_rawstopwrite(ft);
if (rc)
return rc;
/* All samples are already written out. */
if (st_seeki(ft, 0L, 0) != 0)
{
st_fail_errno(ft,errno,"can't rewind output file to rewrite MAUD header");
return(ST_EOF);
}
maudwriteheader(ft);
return(ST_SUCCESS);
}
#define MAUDHEADERSIZE (4+(4+4+32)+(4+4+32)+(4+4))
static void maudwriteheader(ft_t ft)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
st_writes(ft, "FORM");
st_writedw(ft, (p->nsamples*ft->signal.size) + MAUDHEADERSIZE); /* size of file */
st_writes(ft, "MAUD"); /* File type */
st_writes(ft, "MHDR");
st_writedw(ft, 8*4); /* number of bytes to follow */
st_writedw(ft, p->nsamples); /* number of samples stored in MDAT */
switch (ft->signal.encoding) {
case ST_ENCODING_UNSIGNED:
st_writew(ft, (int) 8); /* number of bits per sample as stored in MDAT */
st_writew(ft, (int) 8); /* number of bits per sample after decompression */
break;
case ST_ENCODING_SIGN2:
st_writew(ft, (int) 16); /* number of bits per sample as stored in MDAT */
st_writew(ft, (int) 16); /* number of bits per sample after decompression */
break;
case ST_ENCODING_ALAW:
case ST_ENCODING_ULAW:
st_writew(ft, (int) 8); /* number of bits per sample as stored in MDAT */
st_writew(ft, (int) 16); /* number of bits per sample after decompression */
break;
default:
break;
}
st_writedw(ft, ft->signal.rate); /* clock source frequency */
st_writew(ft, (int) 1); /* clock devide */
if (ft->signal.channels == 1) {
st_writew(ft, (int) 0); /* channel information */
st_writew(ft, (int) 1); /* number of channels (mono: 1, stereo: 2, ...) */
}
else {
st_writew(ft, (int) 1);
st_writew(ft, (int) 2);
}
switch (ft->signal.encoding) {
case ST_ENCODING_UNSIGNED:
case ST_ENCODING_SIGN2:
st_writew(ft, (int) 0); /* no compression */
break;
case ST_ENCODING_ULAW:
st_writew(ft, (int) 3);
break;
case ST_ENCODING_ALAW:
st_writew(ft, (int) 2);
break;
default:
break;
}
st_writedw(ft, 0); /* reserved */
st_writedw(ft, 0); /* reserved */
st_writedw(ft, 0); /* reserved */
st_writes(ft, "ANNO");
st_writedw(ft, 30); /* length of block */
st_writes(ft, "file create by Sound eXchange ");
st_writes(ft, "MDAT");
st_writedw(ft, p->nsamples * ft->signal.size ); /* samples in file */
}
/* Amiga MAUD */
static const char *maudnames[] = {
"maud",
NULL,
};
static st_format_t st_maud_format = {
maudnames,
NULL,
ST_FILE_BIG_END,
st_maudstartread,
st_rawread,
st_rawstopread,
st_maudstartwrite,
st_maudwrite,
st_maudstopwrite,
st_format_nothing_seek
};
const st_format_t *st_maud_format_fn(void)
{
return &st_maud_format;
}