NetBSD/sys/dev/midisyn.c

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/* $NetBSD: midisyn.c,v 1.3 1998/08/17 21:16:12 augustss Exp $ */
/*
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Author: Lennart Augustsson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/fcntl.h>
#include <sys/vnode.h>
#include <sys/select.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/audioio.h>
#include <sys/midiio.h>
#include <sys/device.h>
#include <dev/audio_if.h>
#include <dev/midi_if.h>
#include <dev/midivar.h>
#include <dev/midisynvar.h>
#ifdef AUDIO_DEBUG
#define DPRINTF(x) if (midisyndebug) printf x
#define DPRINTFN(n,x) if (midisyndebug >= (n)) printf x
int midisyndebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif
int midisyn_findvoice __P((midisyn *, int, int));
void midisyn_freevoice __P((midisyn *, int));
int midisyn_allocvoice __P((midisyn *, u_int32_t, u_int32_t));
u_int32_t midisyn_note_to_freq __P((int));
u_int32_t midisyn_finetune __P((u_int32_t, int, int, int));
int midisyn_open __P((void *, int,
void (*iintr)__P((void *, int)),
void (*ointr)__P((void *)), void *arg));
void midisyn_close __P((void *));
int midisyn_output __P((void *, int));
void midisyn_getinfo __P((void *, struct midi_info *));
int midisyn_ioctl __P((void *, u_long, caddr_t, int, struct proc *));
struct midi_hw_if midisyn_hw_if = {
midisyn_open,
midisyn_close,
midisyn_output,
midisyn_getinfo,
midisyn_ioctl,
};
static int midi_lengths[] = { 3,3,3,3,2,2,3,1 };
/* Number of bytes in a MIDI command, including status */
#define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7])
int
midisyn_open(addr, flags, iintr, ointr, arg)
void *addr;
int flags;
void (*iintr)__P((void *, int));
void (*ointr)__P((void *));
void *arg;
{
midisyn *ms = addr;
DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets));
if (ms->mets->open)
return (ms->mets->open(ms, flags));
else
return (0);
}
void
midisyn_close(addr)
void *addr;
{
midisyn *ms = addr;
DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets));
if (ms->mets->close)
ms->mets->close(ms);
}
void
midisyn_getinfo(addr, mi)
void *addr;
struct midi_info *mi;
{
midisyn *ms = addr;
mi->name = ms->name;
mi->props = 0;
}
int
midisyn_ioctl(maddr, cmd, addr, flag, p)
void *maddr;
u_long cmd;
caddr_t addr;
int flag;
struct proc *p;
{
midisyn *ms = maddr;
if (ms->mets->ioctl)
return (ms->mets->ioctl(ms, cmd, addr, flag, p));
else
return (EINVAL);
}
int
midisyn_findvoice(ms, chan, note)
midisyn *ms;
int chan, note;
{
u_int cn;
int v;
if (!(ms->flags & MS_DOALLOC))
return (chan);
cn = MS_CHANNOTE(chan, note);
for (v = 0; v < ms->nvoice; v++)
if (ms->voices[v].chan_note == cn && ms->voices[v].inuse)
return (v);
return (-1);
}
void
midisyn_attach(sc, ms)
struct midi_softc *sc;
midisyn *ms;
{
if (ms->flags & MS_DOALLOC) {
ms->voices = malloc(ms->nvoice * sizeof (struct voice),
M_DEVBUF, M_WAITOK);
memset(ms->voices, 0, ms->nvoice * sizeof (struct voice));
ms->seqno = 1;
if (ms->mets->allocv == 0)
ms->mets->allocv = &midisyn_allocvoice;
}
sc->hw_if = &midisyn_hw_if;
sc->hw_hdl = ms;
DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl));
}
void
midisyn_freevoice(ms, voice)
midisyn *ms;
int voice;
{
if (!(ms->flags & MS_DOALLOC))
return;
ms->voices[voice].inuse = 0;
}
int
midisyn_allocvoice(ms, chan, note)
midisyn *ms;
u_int32_t chan, note;
{
int bestv, v;
u_int bestseq, s;
if (!(ms->flags & MS_DOALLOC))
return (chan);
/* Find a free voice, or if no free voice is found the oldest. */
bestv = 0;
bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0);
for (v = 1; v < ms->nvoice; v++) {
s = ms->voices[v].seqno;
if (ms->voices[v].inuse)
s += 0x40000000;
if (s < bestseq) {
bestseq = s;
bestv = v;
}
}
DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n",
bestv, ms->voices[bestv].seqno,
ms->voices[bestv].chan_note,
ms->voices[bestv].inuse));
#ifdef AUDIO_DEBUG
if (ms->voices[bestv].inuse)
DPRINTFN(1,("midisyn_allocvoice: steal %x\n",
ms->voices[bestv].chan_note));
#endif
ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note);
ms->voices[bestv].seqno = ms->seqno++;
ms->voices[bestv].inuse = 1;
return (bestv);
}
int
midisyn_output(addr, b)
void *addr;
int b;
{
midisyn *ms = addr;
u_int8_t status, chan;
int voice = 0; /* initialize to keep gcc quiet */
struct midisyn_methods *fs;
u_int32_t note, vel;
DPRINTF(("midisyn_output: ms=%p b=0x%02x\n", ms, b));
fs = ms->mets;
if (ms->pos < 0) {
/* Doing SYSEX */
DPRINTF(("midisyn_output: sysex 0x%02x\n", b));
if (fs->sysex)
fs->sysex(ms, b);
if (b == MIDI_SYSEX_END)
ms->pos = 0;
return (0);
}
if (ms->pos == 0 && !MIDI_IS_STATUS(b))
ms->pos++; /* repeat last status byte */
ms->buf[ms->pos++] = b;
status = ms->buf[0];
if (ms->pos < MIDI_LENGTH(status))
return (0);
/* Decode the MIDI command */
chan = MIDI_GET_CHAN(status);
note = ms->buf[1];
if (ms->flags & MS_FREQXLATE)
note = midisyn_note_to_freq(note);
vel = ms->buf[2];
switch (MIDI_GET_STATUS(status)) {
case MIDI_NOTEOFF:
voice = midisyn_findvoice(ms, chan, ms->buf[1]);
if (voice >= 0) {
fs->noteoff(ms, voice, note, vel);
midisyn_freevoice(ms, voice);
}
break;
case MIDI_NOTEON:
voice = fs->allocv(ms, chan, ms->buf[1]);
fs->noteon(ms, voice, note, vel);
break;
case MIDI_KEY_PRESSURE:
if (fs->keypres) {
voice = midisyn_findvoice(ms, voice, ms->buf[1]);
if (voice >= 0)
fs->keypres(ms, voice, note, vel);
}
break;
case MIDI_CTL_CHANGE:
if (fs->ctlchg)
fs->ctlchg(ms, chan, ms->buf[1], vel);
break;
case MIDI_PGM_CHANGE:
if (fs->pgmchg)
fs->pgmchg(ms, chan, ms->buf[1]);
break;
case MIDI_CHN_PRESSURE:
if (fs->chnpres) {
voice = midisyn_findvoice(ms, chan, ms->buf[1]);
if (voice >= 0)
fs->chnpres(ms, voice, note);
}
break;
case MIDI_PITCH_BEND:
if (fs->pitchb) {
voice = midisyn_findvoice(ms, chan, ms->buf[1]);
if (voice >= 0)
fs->pitchb(ms, chan, note, vel);
}
break;
case MIDI_SYSTEM_PREFIX:
if (fs->sysex)
fs->sysex(ms, status);
ms->pos = -1;
return (0);
}
ms->pos = 0;
return (0);
}
/*
* Convert a MIDI note to the corresponding frequency.
* The frequency is scaled by 2^16.
*/
u_int32_t
midisyn_note_to_freq(note)
int note;
{
int o, n, f;
#define BASE_OCTAVE 5
static u_int32_t notes[] = {
17145893, 18165441, 19245614, 20390018, 21602472, 22887021,
24247954, 25689813, 27217409, 28835840, 30550508, 32367136
};
o = note / 12;
n = note % 12;
f = notes[n];
if (o < BASE_OCTAVE)
f >>= (BASE_OCTAVE - o);
else if (o > BASE_OCTAVE)
f <<= (o - BASE_OCTAVE);
return (f);
}
u_int32_t
midisyn_finetune(base_freq, bend, range, vibrato_cents)
u_int32_t base_freq;
int bend;
int range;
int vibrato_cents;
{
static u_int16_t semitone_tuning[24] =
{
/* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983,
/* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784,
/* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755
};
static u_int16_t cent_tuning[100] =
{
/* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041,
/* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087,
/* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134,
/* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181,
/* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228,
/* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275,
/* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323,
/* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371,
/* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419,
/* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467,
/* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515,
/* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564,
/* 96 */ 10570, 10576, 10582, 10589
};
u_int32_t amount;
int negative, semitones, cents, multiplier;
if (range == 0)
return base_freq;
if (base_freq == 0)
return base_freq;
if (range >= 8192)
range = 8192;
bend = bend * range / 8192;
bend += vibrato_cents;
if (bend == 0)
return base_freq;
if (bend < 0) {
bend = -bend;
negative = 1;
} else
negative = 0;
if (bend > range)
bend = range;
multiplier = 1;
while (bend > 2399) {
multiplier *= 4;
bend -= 2400;
}
semitones = bend / 100;
if (semitones > 99)
semitones = 99;
cents = bend % 100;
amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents]
/ 10000;
if (negative)
return (base_freq * 10000 / amount); /* Bend down */
else
return (base_freq * amount / 10000); /* Bend up */
}