ref: a5824b582b9501209821871ce9a78b75c19f1cc2
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>
#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(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 sox_maudstartread(sox_format_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 = sox_rawstartread(ft);
if (rc)
return rc;
/* read FORM chunk */
if (sox_reads(ft, buf, 4) == SOX_EOF || strncmp(buf, "FORM", 4) != 0)
{
sox_fail_errno(ft,SOX_EHDR,"MAUD: header does not begin with magic word 'FORM'");
return (SOX_EOF);
}
sox_readdw(ft, &trash32); /* totalsize */
if (sox_reads(ft, buf, 4) == SOX_EOF || strncmp(buf, "MAUD", 4) != 0)
{
sox_fail_errno(ft,SOX_EHDR,"MAUD: 'FORM' chunk does not specify 'MAUD' as type");
return(SOX_EOF);
}
/* read chunks until 'BODY' (or end) */
while (sox_reads(ft, buf, 4) == SOX_SUCCESS && strncmp(buf,"MDAT",4) != 0) {
/*
buf[4] = 0;
sox_debug("chunk %s",buf);
*/
if (strncmp(buf,"MHDR",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize != 8*4)
{
sox_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 */
sox_readdw(ft, &(p->nsamples));
/* number of bits per sample as stored in MDAT */
sox_readw(ft, &bitpersam);
/* number of bits per sample after decompression */
sox_readw(ft, (unsigned short *)&trash16);
sox_readdw(ft, &nom); /* clock source frequency */
sox_readw(ft, &denom); /* clock devide */
if (denom == 0)
{
sox_fail_errno(ft,SOX_EHDR,"MAUD: frequency denominator == 0, failed");
return (SOX_EOF);
}
ft->signal.rate = nom / denom;
sox_readw(ft, &chaninf); /* channel information */
switch (chaninf) {
case 0:
ft->signal.channels = 1;
break;
case 1:
ft->signal.channels = 2;
break;
default:
sox_fail_errno(ft,SOX_EFMT,"MAUD: unsupported number of channels in file");
return (SOX_EOF);
}
sox_readw(ft, &chaninf); /* number of channels (mono: 1, stereo: 2, ...) */
if (chaninf != ft->signal.channels)
{
sox_fail_errno(ft,SOX_EFMT,"MAUD: unsupported number of channels in file");
return(SOX_EOF);
}
sox_readw(ft, &chaninf); /* compression type */
sox_readdw(ft, &trash32); /* rest of chunk, unused yet */
sox_readdw(ft, &trash32);
sox_readdw(ft, &trash32);
if (bitpersam == 8 && chaninf == 0) {
ft->signal.size = SOX_SIZE_BYTE;
ft->signal.encoding = SOX_ENCODING_UNSIGNED;
}
else if (bitpersam == 8 && chaninf == 2) {
ft->signal.size = SOX_SIZE_BYTE;
ft->signal.encoding = SOX_ENCODING_ALAW;
}
else if (bitpersam == 8 && chaninf == 3) {
ft->signal.size = SOX_SIZE_BYTE;
ft->signal.encoding = SOX_ENCODING_ULAW;
}
else if (bitpersam == 16 && chaninf == 0) {
ft->signal.size = SOX_SIZE_16BIT;
ft->signal.encoding = SOX_ENCODING_SIGN2;
}
else
{
sox_fail_errno(ft,SOX_EFMT,"MAUD: unsupported compression type detected");
return(SOX_EOF);
}
ft->comment = 0;
continue;
}
if (strncmp(buf,"ANNO",4) == 0) {
sox_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
chunk_buf = (char *) xmalloc(chunksize + 1);
if (sox_readbuf(ft, chunk_buf, chunksize)
!= chunksize)
{
sox_fail_errno(ft,SOX_EOF,"MAUD: Unexpected EOF in ANNO header");
return(SOX_EOF);
}
chunk_buf[chunksize] = '\0';
sox_debug("%s",chunk_buf);
free(chunk_buf);
continue;
}
/* some other kind of chunk */
sox_readdw(ft, &chunksize);
if (chunksize & 1)
chunksize++;
sox_seeki(ft, (sox_ssize_t)chunksize, SEEK_CUR);
continue;
}
if (strncmp(buf,"MDAT",4) != 0)
{
sox_fail_errno(ft,SOX_EFMT,"MAUD: MDAT chunk not found");
return(SOX_EOF);
}
sox_readdw(ft, &(p->nsamples));
return(SOX_SUCCESS);
}
static int sox_maudstartwrite(sox_format_t * ft)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
int rc;
/* Needed for rawwrite() */
rc = sox_rawstartwrite(ft);
if (rc)
return rc;
/* If you have to seek around the output file */
if (! ft->seekable)
{
sox_fail_errno(ft,SOX_EOF,"Output .maud file must be a file, not a pipe");
return (SOX_EOF);
}
if (ft->signal.channels != 1 && ft->signal.channels != 2) {
sox_fail_errno(ft,SOX_EFMT,"MAUD: unsupported number of channels, unable to store");
return(SOX_EOF);
}
if (ft->signal.size == SOX_SIZE_16BIT) ft->signal.encoding = SOX_ENCODING_SIGN2;
if (ft->signal.encoding == SOX_ENCODING_ULAW ||
ft->signal.encoding == SOX_ENCODING_ALAW) ft->signal.size = SOX_SIZE_BYTE;
if (ft->signal.size == SOX_SIZE_BYTE &&
ft->signal.encoding == SOX_ENCODING_SIGN2)
ft->signal.encoding = SOX_ENCODING_UNSIGNED;
p->nsamples = 0x7f000000;
maudwriteheader(ft);
p->nsamples = 0;
return (SOX_SUCCESS);
}
static sox_size_t sox_maudwrite(sox_format_t * ft, const sox_sample_t *buf, sox_size_t len)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
p->nsamples += len;
return sox_rawwrite(ft, buf, len);
}
static int sox_maudstopwrite(sox_format_t * ft)
{
int rc;
/* Flush out remaining samples*/
rc = sox_rawstopwrite(ft);
if (rc)
return rc;
/* All samples are already written out. */
if (sox_seeki(ft, 0, 0) != 0)
{
sox_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)
{
struct maudstuff * p = (struct maudstuff *) ft->priv;
sox_writes(ft, "FORM");
sox_writedw(ft, (p->nsamples*ft->signal.size) + MAUDHEADERSIZE); /* size of file */
sox_writes(ft, "MAUD"); /* File type */
sox_writes(ft, "MHDR");
sox_writedw(ft, 8*4); /* number of bytes to follow */
sox_writedw(ft, p->nsamples); /* number of samples stored in MDAT */
switch (ft->signal.encoding) {
case SOX_ENCODING_UNSIGNED:
sox_writew(ft, (int) 8); /* number of bits per sample as stored in MDAT */
sox_writew(ft, (int) 8); /* number of bits per sample after decompression */
break;
case SOX_ENCODING_SIGN2:
sox_writew(ft, (int) 16); /* number of bits per sample as stored in MDAT */
sox_writew(ft, (int) 16); /* number of bits per sample after decompression */
break;
case SOX_ENCODING_ALAW:
case SOX_ENCODING_ULAW:
sox_writew(ft, (int) 8); /* number of bits per sample as stored in MDAT */
sox_writew(ft, (int) 16); /* number of bits per sample after decompression */
break;
default:
break;
}
sox_writedw(ft, ft->signal.rate); /* clock source frequency */
sox_writew(ft, (int) 1); /* clock devide */
if (ft->signal.channels == 1) {
sox_writew(ft, (int) 0); /* channel information */
sox_writew(ft, (int) 1); /* number of channels (mono: 1, stereo: 2, ...) */
}
else {
sox_writew(ft, (int) 1);
sox_writew(ft, (int) 2);
}
switch (ft->signal.encoding) {
case SOX_ENCODING_UNSIGNED:
case SOX_ENCODING_SIGN2:
sox_writew(ft, (int) 0); /* no compression */
break;
case SOX_ENCODING_ULAW:
sox_writew(ft, (int) 3);
break;
case SOX_ENCODING_ALAW:
sox_writew(ft, (int) 2);
break;
default:
break;
}
sox_writedw(ft, 0); /* reserved */
sox_writedw(ft, 0); /* reserved */
sox_writedw(ft, 0); /* reserved */
sox_writes(ft, "ANNO");
sox_writedw(ft, 30); /* length of block */
sox_writes(ft, "file create by Sound eXchange ");
sox_writes(ft, "MDAT");
sox_writedw(ft, p->nsamples * ft->signal.size ); /* samples in file */
}
/* Amiga MAUD */
static const char *maudnames[] = {
"maud",
NULL,
};
static sox_format_handler_t sox_maud_format = {
maudnames,
SOX_FILE_BIG_END,
sox_maudstartread,
sox_rawread,
sox_rawstopread,
sox_maudstartwrite,
sox_maudwrite,
sox_maudstopwrite,
sox_format_nothing_seek
};
const sox_format_handler_t *sox_maud_format_fn(void);
const sox_format_handler_t *sox_maud_format_fn(void)
{
return &sox_maud_format;
}