ref: 25982e4ff28ba2d92131db29adcd2b940b2f6bad
dir: /src/maud.c/
/* libSoX MAUD file format handler, 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 "sox_i.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
/* Private data for MAUD file */
typedef struct {
uint32_t nsamples;
} priv_t;
static void maudwriteheader(sox_format_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 startread(sox_format_t * ft)
{
priv_t * p = (priv_t *) 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 = lsx_rawstartread(ft);
if (rc)
return rc;
/* read FORM chunk */
if (lsx_reads(ft, buf, (size_t)4) == SOX_EOF || strncmp(buf, "FORM", (size_t)4) != 0)
{
lsx_fail_errno(ft,SOX_EHDR,"MAUD: header does not begin with magic word `FORM'");
return (SOX_EOF);
}
lsx_readdw(ft, &trash32); /* totalsize */
if (lsx_reads(ft, buf, (size_t)4) == SOX_EOF || strncmp(buf, "MAUD", (size_t)4) != 0)
{
lsx_fail_errno(ft,SOX_EHDR,"MAUD: `FORM' chunk does not specify `MAUD' as type");
return(SOX_EOF);
}
/* read chunks until 'BODY' (or end) */
while (lsx_reads(ft, buf, (size_t)4) == SOX_SUCCESS && strncmp(buf,"MDAT",(size_t)4) != 0) {
/*
buf[4] = 0;
lsx_debug("chunk %s",buf);
*/
if (strncmp(buf,"MHDR",(size_t)4) == 0) {
lsx_readdw(ft, &chunksize);
if (chunksize != 8*4)
{
lsx_fail_errno(ft,SOX_EHDR,"MAUD: MHDR chunk has bad size");
return(SOX_EOF);
}
/* fseeko(ft->fp,12,SEEK_CUR); */
/* number of samples stored in MDAT */
lsx_readdw(ft, &(p->nsamples));
/* number of bits per sample as stored in MDAT */
lsx_readw(ft, &bitpersam);
/* number of bits per sample after decompression */
lsx_readw(ft, &trash16);
lsx_readdw(ft, &nom); /* clock source frequency */
lsx_readw(ft, &denom); /* clock devide */
if (denom == 0)
{
lsx_fail_errno(ft,SOX_EHDR,"MAUD: frequency denominator == 0, failed");
return (SOX_EOF);
}
ft->signal.rate = nom / denom;
lsx_readw(ft, &chaninf); /* channel information */
switch (chaninf) {
case 0:
ft->signal.channels = 1;
break;
case 1:
ft->signal.channels = 2;
break;
default:
lsx_fail_errno(ft,SOX_EFMT,"MAUD: unsupported number of channels in file");
return (SOX_EOF);
}
lsx_readw(ft, &chaninf); /* number of channels (mono: 1, stereo: 2, ...) */
if (chaninf != ft->signal.channels)
{
lsx_fail_errno(ft,SOX_EFMT,"MAUD: unsupported number of channels in file");
return(SOX_EOF);
}
lsx_readw(ft, &chaninf); /* compression type */
lsx_readdw(ft, &trash32); /* rest of chunk, unused yet */
lsx_readdw(ft, &trash32);
lsx_readdw(ft, &trash32);
if (bitpersam == 8 && chaninf == 0) {
ft->encoding.bits_per_sample = 8;
ft->encoding.encoding = SOX_ENCODING_UNSIGNED;
}
else if (bitpersam == 8 && chaninf == 2) {
ft->encoding.bits_per_sample = 8;
ft->encoding.encoding = SOX_ENCODING_ALAW;
}
else if (bitpersam == 8 && chaninf == 3) {
ft->encoding.bits_per_sample = 8;
ft->encoding.encoding = SOX_ENCODING_ULAW;
}
else if (bitpersam == 16 && chaninf == 0) {
ft->encoding.bits_per_sample = 16;
ft->encoding.encoding = SOX_ENCODING_SIGN2;
}
else
{
lsx_fail_errno(ft,SOX_EFMT,"MAUD: unsupported compression type detected");
return(SOX_EOF);
}
continue;
}
if (strncmp(buf,"ANNO",(size_t)4) == 0) {
lsx_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = lsx_malloc(chunksize + (size_t)1);
if (lsx_readbuf(ft, chunk_buf, (size_t)chunksize)
!= chunksize)
{
lsx_fail_errno(ft,SOX_EOF,"MAUD: Unexpected EOF in ANNO header");
return(SOX_EOF);
}
chunk_buf[chunksize] = '\0';
lsx_debug("%s",chunk_buf);
free(chunk_buf);
continue;
}
/* some other kind of chunk */
lsx_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
lsx_seeki(ft, (off_t)chunksize, SEEK_CUR);
continue;
}
if (strncmp(buf,"MDAT",(size_t)4) != 0)
{
lsx_fail_errno(ft,SOX_EFMT,"MAUD: MDAT chunk not found");
return(SOX_EOF);
}
lsx_readdw(ft, &(p->nsamples));
return(SOX_SUCCESS);
}
static int startwrite(sox_format_t * ft)
{
priv_t * p = (priv_t *) ft->priv;
int rc;
/* Needed for rawwrite() */
rc = lsx_rawstartwrite(ft);
if (rc)
return rc;
/* If you have to seek around the output file */
if (! ft->seekable)
{
lsx_fail_errno(ft,SOX_EOF,"Output .maud file must be a file, not a pipe");
return (SOX_EOF);
}
p->nsamples = 0x7f000000;
maudwriteheader(ft);
p->nsamples = 0;
return (SOX_SUCCESS);
}
static size_t write_samples(sox_format_t * ft, const sox_sample_t *buf, size_t len)
{
priv_t * p = (priv_t *) ft->priv;
p->nsamples += len;
return lsx_rawwrite(ft, buf, len);
}
static int stopwrite(sox_format_t * ft)
{
/* All samples are already written out. */
if (lsx_seeki(ft, (off_t)0, 0) != 0)
{
lsx_fail_errno(ft,errno,"can't rewind output file to rewrite MAUD header");
return(SOX_EOF);
}
maudwriteheader(ft);
return(SOX_SUCCESS);
}
#define MAUDHEADERSIZE (4+(4+4+32)+(4+4+32)+(4+4))
static void maudwriteheader(sox_format_t * ft)
{
priv_t * p = (priv_t *) ft->priv;
lsx_writes(ft, "FORM");
lsx_writedw(ft, (p->nsamples* (ft->encoding.bits_per_sample >> 3)) + MAUDHEADERSIZE); /* size of file */
lsx_writes(ft, "MAUD"); /* File type */
lsx_writes(ft, "MHDR");
lsx_writedw(ft, 8*4); /* number of bytes to follow */
lsx_writedw(ft, p->nsamples); /* number of samples stored in MDAT */
switch (ft->encoding.encoding) {
case SOX_ENCODING_UNSIGNED:
lsx_writew(ft, 8); /* number of bits per sample as stored in MDAT */
lsx_writew(ft, 8); /* number of bits per sample after decompression */
break;
case SOX_ENCODING_SIGN2:
lsx_writew(ft, 16); /* number of bits per sample as stored in MDAT */
lsx_writew(ft, 16); /* number of bits per sample after decompression */
break;
case SOX_ENCODING_ALAW:
case SOX_ENCODING_ULAW:
lsx_writew(ft, 8); /* number of bits per sample as stored in MDAT */
lsx_writew(ft, 16); /* number of bits per sample after decompression */
break;
default:
break;
}
lsx_writedw(ft, (unsigned)(ft->signal.rate + .5)); /* sample rate, Hz */
lsx_writew(ft, (int) 1); /* clock devide */
if (ft->signal.channels == 1) {
lsx_writew(ft, 0); /* channel information */
lsx_writew(ft, 1); /* number of channels (mono: 1, stereo: 2, ...) */
}
else {
lsx_writew(ft, 1);
lsx_writew(ft, 2);
}
switch (ft->encoding.encoding) {
case SOX_ENCODING_UNSIGNED:
case SOX_ENCODING_SIGN2:
lsx_writew(ft, 0); /* no compression */
break;
case SOX_ENCODING_ULAW:
lsx_writew(ft, 3);
break;
case SOX_ENCODING_ALAW:
lsx_writew(ft, 2);
break;
default:
break;
}
lsx_writedw(ft, 0); /* reserved */
lsx_writedw(ft, 0); /* reserved */
lsx_writedw(ft, 0); /* reserved */
lsx_writes(ft, "ANNO");
lsx_writedw(ft, 30); /* length of block */
lsx_writes(ft, "file create by Sound eXchange ");
lsx_writes(ft, "MDAT");
lsx_writedw(ft, p->nsamples * (ft->encoding.bits_per_sample >> 3)); /* samples in file */
}
LSX_FORMAT_HANDLER(maud)
{
static char const * const names[] = {"maud", NULL};
static unsigned const write_encodings[] = {
SOX_ENCODING_SIGN2, 16, 0,
SOX_ENCODING_UNSIGNED, 8, 0,
SOX_ENCODING_ULAW, 8, 0,
SOX_ENCODING_ALAW, 8, 0,
0};
static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
"Used with the ‘Toccata’ sound-card on the Amiga",
names, SOX_FILE_BIG_END | SOX_FILE_MONO | SOX_FILE_STEREO,
startread, lsx_rawread, lsx_rawstopread,
startwrite, write_samples, stopwrite,
NULL, write_encodings, NULL, sizeof(priv_t)
};
return &handler;
}