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/************************************************************************
emumidi.c -- emulation of midi device for FM/OPL3/GUS
Copyright (C) 1994-1996 Nathan I. Laredo
This program is modifiable/redistributable under the terms
of the GNU General Public Licence.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Send your comments and all your spare pocket change to
laredo@gnu.ai.mit.edu (Nathan Laredo) or to PSC 1, BOX 709, 2401
Kelly Drive, Lackland AFB, TX 78236-5128, USA.
*************************************************************************/
#include "emumidi.h"
SEQ_USE_EXTBUF();
extern int seqfd, play_ext, play_gus, play_fm, play_awe;
extern int gus_dev, sb_dev, ext_dev, awe_dev;
extern struct synth_info card_info[MAX_CARDS];
extern int chanmask, perc, ticks, dochan, wantopl3, MT32;
extern int patchloaded[256], fmloaded[256], useprog[16];
int note_vel[16][128];
struct voicestate voice[2][36];
struct chanstate channel[16];
#define C_GUS 0
#define C_FM 1
#define CN (ISGUS(chn) ? C_GUS : C_FM)
#define CHANNEL (dochan ? chn : 0)
void load_sysex(length, data, type)
int length;
unsigned char *data;
int type;
{
unsigned long int i, j;
/*
* If the system exclusive is for roland, evaluate it. More than
* roland could be evaluated here if i had documentation. Please
* submit patches for any other hardware to laredo@gnu.ai.mit.edu
* Complete emulation of all GS sysex messages in the works....
*/
if (length > 7 && data[0] == 0x41 && data[2] == 0x42 && data[3] == 0x12) {
/* GS DATA SET MESSAGES */
if (data[4] == 0x40 && (data[5] & 0xf0) == 0x10 && data[6] == 0x15) {
/* USE RHYTHM PART */
if (!(i = (data[5] & 0xf)))
i = 0x09;
else if (i < 10)
i--;
i = 1<<i;
if (data[7])
perc |= i;
else
perc &= ~i;
}
if ((data[4] == 0x40 || data[4] == 0) &&
data[5] == 0x00 && data[6] == 0x7f) { /* GS RESET */
perc = 0x0200; /* percussion in channel 10 only */
for (i = 0; i < 16; i++) { /* set state info */
for (j = 0; j < 128; j++)
note_vel[i][j] = 0;
channel[i].bender = channel[i].oldbend = 8192;
channel[i].bender_range = channel[i].oldrange = 2;
channel[i].controller[CTL_PAN] = 64;
channel[i].controller[CTL_SUSTAIN] = 0;
}
}
}
if (!play_ext)
return;
if (type == MIDI_SYSTEM_PREFIX)
SEQ_MIDIOUT(ext_dev, MIDI_SYSTEM_PREFIX);
for (i = 0; i < length; i++)
SEQ_MIDIOUT(ext_dev, data[i]);
}
int seq_set_patch(chn, pgm)
int chn, pgm;
{
if (MT32 && pgm < 128)
pgm = mt32pgm[pgm];
if (useprog[chn])
pgm = useprog[chn] - 1;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(ext_dev, MIDI_PGM_CHANGE + CHANNEL);
SEQ_MIDIOUT(ext_dev, pgm);
} else if (ISAWE(chn)) {
SEQ_SET_PATCH(awe_dev, chn, pgm);
} else if (ISPERC(chn)) {
if (ISGUS(chn) && patchloaded[pgm] != 1)
return -1;
else if (ISFM(chn) && !fmloaded[pgm])
return -1;
} else if (ISGUS(chn) && patchloaded[pgm] != 1)
/* find first loaded gus program to replace missing one */
for (pgm = 0; patchloaded[pgm] != 1; pgm++);
return (channel[chn].program = pgm);
}
/* finetune returns exact frequency with bender applied. Not used */
int finetune(chn, note)
int chn, note;
{
long int r, b, d;
r = channel[chn].bender_range;
b = channel[chn].bender - 8192;
if (!b || r + note > 127 || r - note < 0)
return n_freq[note];
r = n_freq[note + r] - n_freq[note - r];
d = b * r;
d /= 8192;
return n_freq[note] + d;
}
extern int _seqbufptr;
void seq_stop_note(dev, chn, note, vel)
int dev, chn, note, vel;
{
int i, card = CN;
note_vel[chn][note] = 0;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_NOTEOFF + CHANNEL);
SEQ_MIDIOUT(dev, note);
SEQ_MIDIOUT(dev, vel);
} else if (ISAWE(chn)) {
SEQ_STOP_NOTE(dev, chn, note, vel);
} else
for (i = 0; i < card_info[dev].nr_voices; i++)
if (voice[card][i].channel == chn &&
voice[card][i].note == note) {
voice[card][i].dead = 1;
voice[card][i].timestamp /= 2;
if (!channel[chn].controller[CTL_SUSTAIN] && !ISPERC(chn))
SEQ_STOP_NOTE(dev, i, note, vel);
}
}
void seq_key_pressure(dev, chn, note, vel)
int dev, chn, note, vel;
{
int i, card = CN;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_KEY_PRESSURE + CHANNEL);
SEQ_MIDIOUT(dev, note);
SEQ_MIDIOUT(dev, vel);
} else if (ISAWE(chn)) {
AWE_KEY_PRESSURE(dev, chn, note, vel);
} else
for (i = 0; i < card_info[dev].nr_voices; i++)
if (voice[card][i].channel == chn &&
voice[card][i].note == note)
SEQ_KEY_PRESSURE(dev, i, note, vel);
}
int new_voice(dev, chn)
int dev, chn;
{
int i, oldest, last, card = CN;
if (ISFM(chn) && fmloaded[channel[chn].program] == OPL3_PATCH)
last = 6; /* 4-op voice can only use first six voices */
else
last = card_info[dev].nr_voices;
for (i = oldest = 0; i < last; i++)
if (voice[card][i].timestamp < voice[card][oldest].timestamp)
oldest = i;
return oldest;
}
void seq_start_note(dev, chn, note, vel)
int dev, chn, note, vel;
{
int v, c, card = CN;
note_vel[chn][note] = vel;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_NOTEON + CHANNEL);
SEQ_MIDIOUT(dev, note);
SEQ_MIDIOUT(dev, vel);
} else if (vel == 0)
seq_stop_note(dev, chn, note, 64);
else if (ISAWE(chn)) {
SEQ_START_NOTE(dev, chn, note, vel);
} else {
v = new_voice(dev, chn);
SEQ_SET_PATCH(dev, v, channel[chn].program);
SEQ_BENDER_RANGE(dev, v, (channel[chn].bender_range * 100));
SEQ_BENDER(dev, v, channel[chn].bender);
SEQ_CONTROL(dev, v, CTL_PAN,
channel[chn].controller[CTL_PAN]);
SEQ_START_NOTE(dev, v, note, vel);
voice[card][v].note = note;
voice[card][v].channel = chn;
voice[card][v].timestamp = ticks;
voice[card][v].dead = 0;
if ((c = channel[chn].controller[CTL_CHORUS_DEPTH] * 8)) {
if (channel[chn].bender_range)
c /= channel[chn].bender_range;
v = new_voice(dev, chn);
SEQ_SET_PATCH(dev, v, channel[chn].program);
SEQ_BENDER_RANGE(dev, v, (channel[chn].bender_range * 100));
if (channel[chn].bender + c < 0x4000) {
SEQ_BENDER(dev, v, channel[chn].bender + c);
} else {
SEQ_BENDER(dev, v, channel[chn].bender - c);
}
/* put chorus note on the "extreme" side */
c = channel[chn].controller[CTL_PAN];
if (c < 64)
c = 0;
else if (c > 64)
c = 127;
SEQ_CONTROL(dev, v, CTL_PAN, c);
SEQ_START_NOTE(dev, v, note, vel);
voice[card][v].note = note;
voice[card][v].channel = chn;
/* allow chorus note to be stolen very quickly */
voice[card][v].timestamp = ticks / 2;
voice[card][v].dead = 0;
}
}
}
static int rpn1[16] =
{127, 127, 127, 127, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127};
static int rpn2[16] =
{127, 127, 127, 127, 127, 127, 127, 127,
127, 127, 127, 127, 127, 127, 127, 127};
void seq_control(dev, chn, p1, p2)
int dev, chn, p1, p2;
{
int i, card = CN;
channel[chn].controller[p1] = p2;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_CTL_CHANGE + CHANNEL);
SEQ_MIDIOUT(dev, p1);
SEQ_MIDIOUT(dev, p2);
}
if (p1 == 7 || p1 == 39)
return;
switch (p1) {
case CTL_SUSTAIN:
if (ISAWE(chn)) {
SEQ_CONTROL(dev, chn, p1, p2);
} else if (!ISMIDI(chn))
if (p1 == CTL_SUSTAIN && !p2) {
for (i = 0; i < card_info[card].nr_voices; i++)
if (voice[card][i].channel == chn
&& voice[card][i].dead) {
SEQ_STOP_NOTE(dev, i, voice[card][i].note, 64);
voice[card][i].dead = 0;
}
}
break;
case CTL_REGIST_PARM_NUM_MSB:
rpn1[chn] = p2;
break;
case CTL_REGIST_PARM_NUM_LSB:
rpn2[chn] = p2;
break;
case CTL_DATA_ENTRY:
if (rpn1[chn] == 0 && rpn2[chn] == 0) {
channel[chn].oldrange = channel[chn].bender_range;
channel[chn].bender_range = p2;
rpn1[chn] = rpn2[chn] = 127;
if (ISAWE(chn)) {
SEQ_BENDER_RANGE(dev, chn, p2 * 100);
} else if (!ISMIDI(chn))
for (i = 0; i < card_info[card].nr_voices; i++)
SEQ_BENDER_RANGE(dev, i, p2 * 100);
}
break;
default:
/* sent on the off chance the sound driver is enhanced */
if (ISAWE(chn)) {
SEQ_CONTROL(dev, chn, p1, p2);
} else if (!ISMIDI(chn) && (p1 < 0x10 || (p1 & 0xf0) == 0x50))
for (i = 0; i < card_info[card].nr_voices; i++)
if (voice[card][i].channel == chn)
SEQ_CONTROL(dev, i, p1, p2);
break;
}
}
void seq_chn_pressure(dev, chn, vel)
int dev, chn, vel;
{
int card = CN, i;
channel[chn].pressure = vel;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_CHN_PRESSURE + CHANNEL);
SEQ_MIDIOUT(dev, vel);
} else if (ISAWE(chn)) {
AWE_CHN_PRESSURE(dev, chn, vel);
} else
for (i = 0; i < card_info[dev].nr_voices; i++)
if (voice[card][i].channel == chn)
SEQ_KEY_PRESSURE(dev, i, voice[card][i].note, vel);
}
void seq_bender(dev, chn, p1, p2)
int dev, chn, p1, p2;
{
int card = CN, i, val;
val = (p2 << 7) + p1;
channel[chn].oldbend = channel[chn].bender;
channel[chn].bender = val;
if (ISMIDI(chn)) {
SEQ_MIDIOUT(dev, MIDI_PITCH_BEND + CHANNEL);
SEQ_MIDIOUT(dev, p1);
SEQ_MIDIOUT(dev, p2);
} else if (ISAWE(chn)) {
SEQ_BENDER(dev, chn, val);
} else
for (i = 0; i < card_info[dev].nr_voices; i++)
if (voice[card][i].channel == chn)
SEQ_BENDER(dev, i, val);
}
void seq_reset()
{
int i, j;
_seqbufptr = ticks = 0;
ioctl(seqfd, SNDCTL_SEQ_RESET);
for (i = 0; i < 16; i++) {
if (ISMIDI(i)) {
seq_control(ext_dev,i,0,0);
seq_control(ext_dev,i,32,0);
}
seq_set_patch(i, 0);
for (j = 0; j < 128; j++)
note_vel[i][j] = 0;
channel[i].bender = channel[i].oldbend = 8192;
channel[i].bender_range = channel[i].oldrange = 2;
channel[i].controller[CTL_PAN] = 64;
channel[i].controller[CTL_SUSTAIN] = 0;
}
if (play_gus)
for (i = 0; i < card_info[gus_dev].nr_voices; i++) {
SEQ_CONTROL(gus_dev, i, SEQ_VOLMODE, VOL_METHOD_LINEAR);
if (voice[0][i].note)
SEQ_STOP_NOTE(gus_dev, i, voice[0][i].note, 64);
voice[0][i].dead = voice[0][i].timestamp = -1;
}
if (play_fm) {
if (wantopl3)
ioctl(seqfd, SNDCTL_FM_4OP_ENABLE, &sb_dev);
for (i = 0; i < card_info[sb_dev].nr_voices; i++) {
SEQ_CONTROL(sb_dev, i, SEQ_VOLMODE, VOL_METHOD_LINEAR);
if (voice[1][i].note)
SEQ_STOP_NOTE(sb_dev, i, voice[1][i].note, 64);
voice[1][i].dead = voice[1][i].timestamp = -1;
}
}
if (play_awe) {
AWE_SET_CHANNEL_MODE(awe_dev, 1);
AWE_DRUM_CHANNELS(awe_dev, perc);
AWE_TERMINATE_ALL(awe_dev);
for (i = 0; i < card_info[awe_dev].nr_voices; i++) {
voice[0][i].dead = voice[0][i].timestamp = -1;
}
}
SEQ_DUMPBUF();
}
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