ref: 9f72db1f539ef08438ef679424a2c05d08c473d6
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.h"
#define AVR_MAGIC "2BIT"
/* Taken from the Audio File Formats FAQ */
typedef struct avrstuff {
char magic [4]; /* 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 */
ULONG int rate; /* sample frequency in hertz */
ULONG size; /* sample length in bytes or words (see rez) */
ULONG lbeg; /* offset to start of loop in bytes or words.
set to zero if unused. */
ULONG 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 style of samples,
* mono/stereo/quad.
*/
void
avrstartread(ft)
ft_t ft;
{
avr_t avr = (avr_t)ft->priv;
int littlendian = 1;
char *endptr;
/* AVR is a Big Endian format. Swap whats read in on Little */
/* Endian machines. */
endptr = (char *) &littlendian;
if (*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
rawstartread (ft);
fread (avr->magic, 1, sizeof (avr->magic), ft->fp);
if (strncmp (avr->magic, AVR_MAGIC, 4)) {
fail ("AVR: unknown header");
}
fread (avr->name, 1, sizeof (avr->name), ft->fp);
avr->mono = rshort (ft);
if (avr->mono) {
ft->info.channels = 2;
}
else {
ft->info.channels = 1;
}
avr->rez = rshort (ft);
if (avr->rez == 8) {
ft->info.size = BYTE;
}
else if (avr->rez == 16) {
ft->info.size = WORD;
}
else {
fail ("AVR: unsupported sample resolution");
}
avr->sign = rshort (ft);
if (avr->sign) {
ft->info.style = SIGN2;
}
else {
ft->info.style = UNSIGNED;
}
avr->loop = rshort (ft);
avr->midi = rshort (ft);
avr->rate = rlong (ft);
/*
* No support for AVRs created by ST-Replay,
* Replay Proffesional and PRO-Series 12.
*
* Just masking the upper byte out.
*/
ft->info.rate = (avr->rate & 0x00ffffff);
avr->size = rlong (ft);
avr->lbeg = rlong (ft);
avr->lend = rlong (ft);
avr->res1 = rshort (ft);
avr->res2 = rshort (ft);
avr->res3 = rshort (ft);
fread (avr->ext, 1, sizeof (avr->ext), ft->fp);
fread (avr->user, 1, sizeof (avr->user), ft->fp);
}
void
avrstartwrite(ft)
ft_t ft;
{
avr_t avr = (avr_t)ft->priv;
int littlendian = 1;
char *endptr;
/* AVR is a Big Endian format. Swap whats read in on Little */
/* Endian machines. */
endptr = (char *) &littlendian;
if (*endptr)
{
ft->swap = ft->swap ? 0 : 1;
}
if (!ft->seekable) {
fail ("AVR: file is not seekable");
}
rawstartwrite (ft);
/* magic */
fwrite (AVR_MAGIC, 1, sizeof (avr->magic), ft->fp);
/* name */
fwrite ("\0\0\0\0\0\0\0\0", 1, sizeof (avr->name), ft->fp);
/* mono */
if (ft->info.channels == 1) {
wshort (ft, 0);
}
else if (ft->info.channels == 2) {
wshort (ft, 0xffff);
}
else {
fail ("AVR: number of channels not supported");
}
/* rez */
if (ft->info.size == BYTE) {
wshort (ft, 8);
}
else if (ft->info.size == WORD) {
wshort (ft, 16);
}
else {
fail ("AVR: unsupported sample resolution");
}
/* sign */
if (ft->info.style == SIGN2) {
wshort (ft, 0xffff);
}
else if (ft->info.style == UNSIGNED) {
wshort (ft, 0);
}
else {
fail ("AVR: unsupported style");
}
/* loop */
wshort (ft, 0xffff);
/* midi */
wshort (ft, 0xffff);
/* rate */
wlong (ft, ft->info.rate);
/* size */
/* Don't know the size yet. */
wlong (ft, 0);
/* lbeg */
wlong (ft, 0);
/* lend */
/* Don't know the size yet, so we can't set lend, either. */
wlong (ft, 0);
/* res1 */
wshort (ft, 0);
/* res2 */
wshort (ft, 0);
/* res3 */
wshort (ft, 0);
/* ext */
fwrite ("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 1, sizeof (avr->ext),
ft->fp);
/* user */
fwrite ("\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), ft->fp);
}
void
avrwrite(ft, buf, nsamp)
ft_t ft;
LONG *buf, nsamp;
{
avr_t avr = (avr_t)ft->priv;
avr->size += nsamp;
rawwrite (ft, buf, nsamp);
}
void
avrstopwrite(ft)
ft_t ft;
{
avr_t avr = (avr_t)ft->priv;
int size = avr->size / ft->info.channels;
rawstopwrite(ft);
/* Fix size */
fseek (ft->fp, 26L, SEEK_SET);
wlong (ft, size);
/* Fix lend */
fseek (ft->fp, 34L, SEEK_SET);
wlong (ft, size);
}