ref: 3551f2a82d7c32d6014e477263a8ca242e704a71
dir: /src/avr.c/
/*
AVR file format driver for SoX
Copyright (C) 1999 Jan Paul Schmidt <jps@fundament.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <string.h>
#include "st_i.h"
#define AVR_MAGIC "2BIT"
/* Taken from the Audio File Formats FAQ */
typedef struct avrstuff {
char magic [5]; /* 2BIT */
char name [8]; /* null-padded sample name */
unsigned short mono; /* 0 = mono, 0xffff = stereo */
unsigned short rez; /* 8 = 8 bit, 16 = 16 bit */
unsigned short sign; /* 0 = unsigned, 0xffff = signed */
unsigned short loop; /* 0 = no loop, 0xffff = looping sample */
unsigned short midi; /* 0xffff = no MIDI note assigned,
0xffXX = single key note assignment
0xLLHH = key split, low/hi note */
uint32_t rate; /* sample frequency in hertz */
uint32_t size; /* sample length in bytes or words (see rez) */
uint32_t lbeg; /* offset to start of loop in bytes or words.
set to zero if unused. */
uint32_t lend; /* offset to end of loop in bytes or words.
set to sample length if unused. */
unsigned short res1; /* Reserved, MIDI keyboard split */
unsigned short res2; /* Reserved, sample compression */
unsigned short res3; /* Reserved */
char ext[20]; /* Additional filename space, used
if (name[7] != 0) */
char user[64]; /* User defined. Typically ASCII message. */
} *avr_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_avrstartread(ft_t ft)
{
avr_t avr = (avr_t)ft->priv;
int rc;
st_reads(ft, avr->magic, 4);
if (strncmp (avr->magic, AVR_MAGIC, 4)) {
st_fail_errno(ft,ST_EHDR,"AVR: unknown header");
return(ST_EOF);
}
st_readbuf(ft, avr->name, 1, sizeof(avr->name));
st_readw (ft, &(avr->mono));
if (avr->mono) {
ft->signal.channels = 2;
}
else {
ft->signal.channels = 1;
}
st_readw (ft, &(avr->rez));
if (avr->rez == 8) {
ft->signal.size = ST_SIZE_BYTE;
}
else if (avr->rez == 16) {
ft->signal.size = ST_SIZE_16BIT;
}
else {
st_fail_errno(ft,ST_EFMT,"AVR: unsupported sample resolution");
return(ST_EOF);
}
st_readw (ft, &(avr->sign));
if (avr->sign) {
ft->signal.encoding = ST_ENCODING_SIGN2;
}
else {
ft->signal.encoding = ST_ENCODING_UNSIGNED;
}
st_readw (ft, &(avr->loop));
st_readw (ft, &(avr->midi));
st_readdw (ft, &(avr->rate));
/*
* No support for AVRs created by ST-Replay,
* Replay Proffesional and PRO-Series 12.
*
* Just masking the upper byte out.
*/
ft->signal.rate = (avr->rate & 0x00ffffff);
st_readdw (ft, &(avr->size));
st_readdw (ft, &(avr->lbeg));
st_readdw (ft, &(avr->lend));
st_readw (ft, &(avr->res1));
st_readw (ft, &(avr->res2));
st_readw (ft, &(avr->res3));
st_readbuf(ft, avr->ext, 1, sizeof(avr->ext));
st_readbuf(ft, avr->user, 1, sizeof(avr->user));
rc = st_rawstartread (ft);
if (rc)
return rc;
return(ST_SUCCESS);
}
static int st_avrstartwrite(ft_t ft)
{
avr_t avr = (avr_t)ft->priv;
int rc;
if (!ft->seekable) {
st_fail_errno(ft,ST_EOF,"AVR: file is not seekable");
return(ST_EOF);
}
rc = st_rawstartwrite (ft);
if (rc)
return rc;
/* magic */
st_writes(ft, AVR_MAGIC);
/* name */
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
st_writeb(ft, 0);
/* mono */
if (ft->signal.channels == 1) {
st_writew (ft, 0);
}
else if (ft->signal.channels == 2) {
st_writew (ft, 0xffff);
}
else {
st_fail_errno(ft,ST_EFMT,"AVR: number of channels not supported");
return(0);
}
/* rez */
if (ft->signal.size == ST_SIZE_BYTE) {
st_writew (ft, 8);
}
else if (ft->signal.size == ST_SIZE_16BIT) {
st_writew (ft, 16);
}
else {
st_fail_errno(ft,ST_EFMT,"AVR: unsupported sample resolution");
return(ST_EOF);
}
/* sign */
if (ft->signal.encoding == ST_ENCODING_SIGN2) {
st_writew (ft, 0xffff);
}
else if (ft->signal.encoding == ST_ENCODING_UNSIGNED) {
st_writew (ft, 0);
}
else {
st_fail_errno(ft,ST_EFMT,"AVR: unsupported encoding");
return(ST_EOF);
}
/* loop */
st_writew (ft, 0xffff);
/* midi */
st_writew (ft, 0xffff);
/* rate */
st_writedw (ft, ft->signal.rate);
/* size */
/* Don't know the size yet. */
st_writedw (ft, 0);
/* lbeg */
st_writedw (ft, 0);
/* lend */
/* Don't know the size yet, so we can't set lend, either. */
st_writedw (ft, 0);
/* res1 */
st_writew (ft, 0);
/* res2 */
st_writew (ft, 0);
/* res3 */
st_writew (ft, 0);
/* ext */
st_writebuf(ft, (void *)"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 1, sizeof(avr->ext));
/* user */
st_writebuf(ft,
(void *)"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
"\0\0\0\0", 1, sizeof (avr->user));
return(ST_SUCCESS);
}
static st_size_t st_avrwrite(ft_t ft, const st_sample_t *buf, st_size_t nsamp)
{
avr_t avr = (avr_t)ft->priv;
avr->size += nsamp;
return (st_rawwrite (ft, buf, nsamp));
}
static int st_avrstopwrite(ft_t ft)
{
avr_t avr = (avr_t)ft->priv;
int rc;
int size = avr->size / ft->signal.channels;
rc = st_rawstopwrite(ft);
if (rc)
return rc;
/* Fix size */
st_seeki(ft, 26L, SEEK_SET);
st_writedw (ft, size);
/* Fix lend */
st_seeki(ft, 34L, SEEK_SET);
st_writedw (ft, size);
return(ST_SUCCESS);
}
static const char *avrnames[] = {
"avr",
NULL
};
static st_format_t st_avr_format = {
avrnames,
NULL,
ST_FILE_BIG_END,
st_avrstartread,
st_rawread,
st_format_nothing,
st_avrstartwrite,
st_avrwrite,
st_avrstopwrite,
st_format_nothing_seek
};
const st_format_t *st_avr_format_fn(void)
{
return &st_avr_format;
}