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linux/sound/drivers/opl3/opl3_midi.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program 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 general public license for more details 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
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) by Uros Bizjak <uros@kss-loka.si>
*
* Midi synth routines for OPL2/OPL3/OPL4 FM
*/
#undef DEBUG_ALLOC
#undef DEBUG_MIDI
#include "opl3_voice.h"
#include <sound/asoundef.h>
static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
struct snd_midi_channel *chan);
/*
* The next table looks magical, but it certainly is not. Its values have
* been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
* for i=0. This log-table converts a linear volume-scaling (0..127) to a
* logarithmic scaling as present in the FM-synthesizer chips. so : Volume
* 64 = 0 db = relative volume 0 and: Volume 32 = -6 db = relative
* volume -8 it was implemented as a table because it is only 128 bytes and
* it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
*/
static char opl3_volume_table[128] =
{
-63, -48, -40, -35, -32, -29, -27, -26,
-24, -23, -21, -20, -19, -18, -18, -17,
-16, -15, -15, -14, -13, -13, -12, -12,
-11, -11, -10, -10, -10, -9, -9, -8,
-8, -8, -7, -7, -7, -6, -6, -6,
-5, -5, -5, -5, -4, -4, -4, -4,
-3, -3, -3, -3, -2, -2, -2, -2,
-2, -1, -1, -1, -1, 0, 0, 0,
0, 0, 0, 1, 1, 1, 1, 1,
1, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 4,
4, 4, 4, 4, 4, 4, 4, 5,
5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6,
6, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 8, 8, 8, 8, 8
};
void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
struct snd_midi_channel *chan)
{
int oldvol, newvol, n;
int volume;
volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
if (volume > 127)
volume = 127;
oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);
newvol = opl3_volume_table[volume] + oldvol;
if (newvol > OPL3_TOTAL_LEVEL_MASK)
newvol = OPL3_TOTAL_LEVEL_MASK;
else if (newvol < 0)
newvol = 0;
n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);
*volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
}
/*
* Converts the note frequency to block and fnum values for the FM chip
*/
static short opl3_note_table[16] =
{
305, 323, /* for pitch bending, -2 semitones */
343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
686, 726 /* for pitch bending, +2 semitones */
};
static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
int note, struct snd_midi_channel *chan)
{
int block = ((note / 12) & 0x07) - 1;
int idx = (note % 12) + 2;
int freq;
if (chan->midi_pitchbend) {
int pitchbend = chan->midi_pitchbend;
int segment;
if (pitchbend < -0x2000)
pitchbend = -0x2000;
if (pitchbend > 0x1FFF)
pitchbend = 0x1FFF;
segment = pitchbend / 0x1000;
freq = opl3_note_table[idx+segment];
freq += ((opl3_note_table[idx+segment+1] - freq) *
(pitchbend % 0x1000)) / 0x1000;
} else {
freq = opl3_note_table[idx];
}
*fnum = (unsigned char) freq;
*blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
((block << 2) & OPL3_BLOCKNUM_MASK);
}
#ifdef DEBUG_ALLOC
static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
int i;
char *str = "x.24";
printk(KERN_DEBUG "time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
for (i = 0; i < opl3->max_voices; i++)
printk(KERN_CONT "%c", *(str + opl3->voices[i].state + 1));
printk(KERN_CONT "\n");
}
#endif
/*
* Get a FM voice (channel) to play a note on.
*/
static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
struct snd_midi_channel *chan) {
int chan_4op_1; /* first voice for 4op instrument */
int chan_4op_2; /* second voice for 4op instrument */
struct snd_opl3_voice *vp, *vp2;
unsigned int voice_time;
int i;
#ifdef DEBUG_ALLOC
char *alloc_type[3] = { "FREE ", "CHEAP ", "EXPENSIVE" };
#endif
/* This is our "allocation cost" table */
enum {
FREE = 0, CHEAP, EXPENSIVE, END
};
/* Keeps track of what we are finding */
struct best {
unsigned int time;
int voice;
} best[END];
struct best *bp;
for (i = 0; i < END; i++) {
best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */
best[i].voice = -1;
}
/* Look through all the channels for the most suitable. */
for (i = 0; i < opl3->max_voices; i++) {
vp = &opl3->voices[i];
if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
/* skip unavailable channels, allocated by
drum voices or by bounded 4op voices) */
continue;
voice_time = vp->time;
bp = best;
chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
if (instr_4op) {
/* allocate 4op voice */
/* skip channels unavailable to 4op instrument */
if (!chan_4op_1)
continue;
if (vp->state)
/* kill one voice, CHEAP */
bp++;
/* get state of bounded 2op channel
to be allocated for 4op instrument */
vp2 = &opl3->voices[i + 3];
if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
/* kill two voices, EXPENSIVE */
bp++;
voice_time = (voice_time > vp->time) ?
voice_time : vp->time;
}
} else {
/* allocate 2op voice */
if ((chan_4op_1) || (chan_4op_2))
/* use bounded channels for 2op, CHEAP */
bp++;
else if (vp->state)
/* kill one voice on 2op channel, CHEAP */
bp++;
/* raise kill cost to EXPENSIVE for all channels */
if (vp->state)
bp++;
}
if (voice_time < bp->time) {
bp->time = voice_time;
bp->voice = i;
}
}
for (i = 0; i < END; i++) {
if (best[i].voice >= 0) {
#ifdef DEBUG_ALLOC
printk(KERN_DEBUG "%s %iop allocation on voice %i\n",
alloc_type[i], instr_4op ? 4 : 2,
best[i].voice);
#endif
return best[i].voice;
}
}
/* not found */
return -1;
}
/* ------------------------------ */
/*
* System timer interrupt function
*/
void snd_opl3_timer_func(struct timer_list *t)
{
struct snd_opl3 *opl3 = from_timer(opl3, t, tlist);
unsigned long flags;
int again = 0;
int i;
spin_lock_irqsave(&opl3->voice_lock, flags);
for (i = 0; i < opl3->max_voices; i++) {
struct snd_opl3_voice *vp = &opl3->voices[i];
if (vp->state > 0 && vp->note_off_check) {
if (vp->note_off == jiffies)
snd_opl3_note_off_unsafe(opl3, vp->note, 0,
vp->chan);
else
again++;
}
}
spin_unlock_irqrestore(&opl3->voice_lock, flags);
spin_lock_irqsave(&opl3->sys_timer_lock, flags);
if (again)
mod_timer(&opl3->tlist, jiffies + 1); /* invoke again */
else
opl3->sys_timer_status = 0;
spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}
/*
* Start system timer
*/
static void snd_opl3_start_timer(struct snd_opl3 *opl3)
{
unsigned long flags;
spin_lock_irqsave(&opl3->sys_timer_lock, flags);
if (! opl3->sys_timer_status) {
mod_timer(&opl3->tlist, jiffies + 1);
opl3->sys_timer_status = 1;
}
spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}
/* ------------------------------ */
static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
};
/*
* Start a note.
*/
void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
{
struct snd_opl3 *opl3;
int instr_4op;
int voice;
struct snd_opl3_voice *vp, *vp2;
unsigned short connect_mask;
unsigned char connection;
unsigned char vol_op[4];
int extra_prg = 0;
unsigned short reg_side;
unsigned char op_offset;
unsigned char voice_offset;
unsigned short opl3_reg;
unsigned char reg_val;
unsigned char prg, bank;
int key = note;
unsigned char fnum, blocknum;
int i;
struct fm_patch *patch;
struct fm_instrument *fm;
unsigned long flags;
opl3 = p;
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
chan->number, chan->midi_program, note, vel);
#endif
/* in SYNTH mode, application takes care of voices */
/* in SEQ mode, drum voice numbers are notes on drum channel */
if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
if (chan->drum_channel) {
/* percussion instruments are located in bank 128 */
bank = 128;
prg = note;
} else {
bank = chan->gm_bank_select;
prg = chan->midi_program;
}
} else {
/* Prepare for OSS mode */
if (chan->number >= MAX_OPL3_VOICES)
return;
/* OSS instruments are located in bank 127 */
bank = 127;
prg = chan->midi_program;
}
spin_lock_irqsave(&opl3->voice_lock, flags);
if (use_internal_drums) {
snd_opl3_drum_switch(opl3, note, vel, 1, chan);
spin_unlock_irqrestore(&opl3->voice_lock, flags);
return;
}
__extra_prg:
patch = snd_opl3_find_patch(opl3, prg, bank, 0);
if (!patch) {
spin_unlock_irqrestore(&opl3->voice_lock, flags);
return;
}
fm = &patch->inst;
switch (patch->type) {
case FM_PATCH_OPL2:
instr_4op = 0;
break;
case FM_PATCH_OPL3:
if (opl3->hardware >= OPL3_HW_OPL3) {
instr_4op = 1;
break;
}
/* fall through */
default:
spin_unlock_irqrestore(&opl3->voice_lock, flags);
return;
}
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " --> OPL%i instrument: %s\n",
instr_4op ? 3 : 2, patch->name);
#endif
/* in SYNTH mode, application takes care of voices */
/* in SEQ mode, allocate voice on free OPL3 channel */
if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
voice = opl3_get_voice(opl3, instr_4op, chan);
} else {
/* remap OSS voice */
voice = snd_opl3_oss_map[chan->number];
}
if (voice < 0) {
spin_unlock_irqrestore(&opl3->voice_lock, flags);
return;
}
if (voice < MAX_OPL2_VOICES) {
/* Left register block for voices 0 .. 8 */
reg_side = OPL3_LEFT;
voice_offset = voice;
connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
} else {
/* Right register block for voices 9 .. 17 */
reg_side = OPL3_RIGHT;
voice_offset = voice - MAX_OPL2_VOICES;
connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
}
/* kill voice on channel */
vp = &opl3->voices[voice];
if (vp->state > 0) {
opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
opl3->command(opl3, opl3_reg, reg_val);
}
if (instr_4op) {
vp2 = &opl3->voices[voice + 3];
if (vp->state > 0) {
opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
voice_offset + 3);
reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
opl3->command(opl3, opl3_reg, reg_val);
}
}
/* set connection register */
if (instr_4op) {
if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
opl3->connection_reg |= connect_mask;
/* set connection bit */
opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
opl3->command(opl3, opl3_reg, opl3->connection_reg);
}
} else {
if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
opl3->connection_reg &= ~connect_mask;
/* clear connection bit */
opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
opl3->command(opl3, opl3_reg, opl3->connection_reg);
}
}
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " --> setting OPL3 connection: 0x%x\n",
opl3->connection_reg);
#endif
/*
* calculate volume depending on connection
* between FM operators (see include/opl3.h)
*/
for (i = 0; i < (instr_4op ? 4 : 2); i++)
vol_op[i] = fm->op[i].ksl_level;
connection = fm->feedback_connection[0] & 0x01;
if (instr_4op) {
connection <<= 1;
connection |= fm->feedback_connection[1] & 0x01;
snd_opl3_calc_volume(&vol_op[3], vel, chan);
switch (connection) {
case 0x03:
snd_opl3_calc_volume(&vol_op[2], vel, chan);
/* fallthru */
case 0x02:
snd_opl3_calc_volume(&vol_op[0], vel, chan);
break;
case 0x01:
snd_opl3_calc_volume(&vol_op[1], vel, chan);
}
} else {
snd_opl3_calc_volume(&vol_op[1], vel, chan);
if (connection)
snd_opl3_calc_volume(&vol_op[0], vel, chan);
}
/* Program the FM voice characteristics */
for (i = 0; i < (instr_4op ? 4 : 2); i++) {
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " --> programming operator %i\n", i);
#endif
op_offset = snd_opl3_regmap[voice_offset][i];
/* Set OPL3 AM_VIB register of requested voice/operator */
reg_val = fm->op[i].am_vib;
opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
opl3->command(opl3, opl3_reg, reg_val);
/* Set OPL3 KSL_LEVEL register of requested voice/operator */
reg_val = vol_op[i];
opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
opl3->command(opl3, opl3_reg, reg_val);
/* Set OPL3 ATTACK_DECAY register of requested voice/operator */
reg_val = fm->op[i].attack_decay;
opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
opl3->command(opl3, opl3_reg, reg_val);
/* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */
reg_val = fm->op[i].sustain_release;
opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
opl3->command(opl3, opl3_reg, reg_val);
/* Select waveform */
reg_val = fm->op[i].wave_select;
opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
opl3->command(opl3, opl3_reg, reg_val);
}
/* Set operator feedback and 2op inter-operator connection */
reg_val = fm->feedback_connection[0];
/* Set output voice connection */
reg_val |= OPL3_STEREO_BITS;
if (chan->gm_pan < 43)
reg_val &= ~OPL3_VOICE_TO_RIGHT;
if (chan->gm_pan > 85)
reg_val &= ~OPL3_VOICE_TO_LEFT;
opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
opl3->command(opl3, opl3_reg, reg_val);
if (instr_4op) {
/* Set 4op inter-operator connection */
reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
/* Set output voice connection */
reg_val |= OPL3_STEREO_BITS;
if (chan->gm_pan < 43)
reg_val &= ~OPL3_VOICE_TO_RIGHT;
if (chan->gm_pan > 85)
reg_val &= ~OPL3_VOICE_TO_LEFT;
opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
voice_offset + 3);
opl3->command(opl3, opl3_reg, reg_val);
}
/*
* Special treatment of percussion notes for fm:
* Requested pitch is really program, and pitch for
* device is whatever was specified in the patch library.
*/
if (fm->fix_key)
note = fm->fix_key;
/*
* use transpose if defined in patch library
*/
if (fm->trnsps)
note += (fm->trnsps - 64);
snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);
/* Set OPL3 FNUM_LOW register of requested voice */
opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
opl3->command(opl3, opl3_reg, fnum);
opl3->voices[voice].keyon_reg = blocknum;
/* Set output sound flag */
blocknum |= OPL3_KEYON_BIT;
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " --> trigger voice %i\n", voice);
#endif
/* Set OPL3 KEYON_BLOCK register of requested voice */
opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
opl3->command(opl3, opl3_reg, blocknum);
/* kill note after fixed duration (in centiseconds) */
if (fm->fix_dur) {
opl3->voices[voice].note_off = jiffies +
(fm->fix_dur * HZ) / 100;
snd_opl3_start_timer(opl3);
opl3->voices[voice].note_off_check = 1;
} else
opl3->voices[voice].note_off_check = 0;
/* get extra pgm, but avoid possible loops */
extra_prg = (extra_prg) ? 0 : fm->modes;
/* do the bookkeeping */
vp->time = opl3->use_time++;
vp->note = key;
vp->chan = chan;
if (instr_4op) {
vp->state = SNDRV_OPL3_ST_ON_4OP;
vp2 = &opl3->voices[voice + 3];
vp2->time = opl3->use_time++;
vp2->note = key;
vp2->chan = chan;
vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
} else {
if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
/* 4op killed by 2op, release bounded voice */
vp2 = &opl3->voices[voice + 3];
vp2->time = opl3->use_time++;
vp2->state = SNDRV_OPL3_ST_OFF;
}
vp->state = SNDRV_OPL3_ST_ON_2OP;
}
#ifdef DEBUG_ALLOC
debug_alloc(opl3, "note on ", voice);
#endif
/* allocate extra program if specified in patch library */
if (extra_prg) {
if (extra_prg > 128) {
bank = 128;
/* percussions start at 35 */
prg = extra_prg - 128 + 35 - 1;
} else {
bank = 0;
prg = extra_prg - 1;
}
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " *** allocating extra program\n");
#endif
goto __extra_prg;
}
spin_unlock_irqrestore(&opl3->voice_lock, flags);
}
static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
{
unsigned short reg_side;
unsigned char voice_offset;
unsigned short opl3_reg;
struct snd_opl3_voice *vp, *vp2;
if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
return;
vp = &opl3->voices[voice];
if (voice < MAX_OPL2_VOICES) {
/* Left register block for voices 0 .. 8 */
reg_side = OPL3_LEFT;
voice_offset = voice;
} else {
/* Right register block for voices 9 .. 17 */
reg_side = OPL3_RIGHT;
voice_offset = voice - MAX_OPL2_VOICES;
}
/* kill voice */
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG " --> kill voice %i\n", voice);
#endif
opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
/* clear Key ON bit */
opl3->command(opl3, opl3_reg, vp->keyon_reg);
/* do the bookkeeping */
vp->time = opl3->use_time++;
if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
vp2 = &opl3->voices[voice + 3];
vp2->time = opl3->use_time++;
vp2->state = SNDRV_OPL3_ST_OFF;
}
vp->state = SNDRV_OPL3_ST_OFF;
#ifdef DEBUG_ALLOC
debug_alloc(opl3, "note off", voice);
#endif
}
/*
* Release a note in response to a midi note off.
*/
static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
struct snd_midi_channel *chan)
{
struct snd_opl3 *opl3;
int voice;
struct snd_opl3_voice *vp;
opl3 = p;
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
chan->number, chan->midi_program, note);
#endif
if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
if (chan->drum_channel && use_internal_drums) {
snd_opl3_drum_switch(opl3, note, vel, 0, chan);
return;
}
/* this loop will hopefully kill all extra voices, because
they are grouped by the same channel and note values */
for (voice = 0; voice < opl3->max_voices; voice++) {
vp = &opl3->voices[voice];
if (vp->state > 0 && vp->chan == chan && vp->note == note) {
snd_opl3_kill_voice(opl3, voice);
}
}
} else {
/* remap OSS voices */
if (chan->number < MAX_OPL3_VOICES) {
voice = snd_opl3_oss_map[chan->number];
snd_opl3_kill_voice(opl3, voice);
}
}
}
void snd_opl3_note_off(void *p, int note, int vel,
struct snd_midi_channel *chan)
{
struct snd_opl3 *opl3 = p;
unsigned long flags;
spin_lock_irqsave(&opl3->voice_lock, flags);
snd_opl3_note_off_unsafe(p, note, vel, chan);
spin_unlock_irqrestore(&opl3->voice_lock, flags);
}
/*
* key pressure change
*/
void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
{
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "Key pressure, ch#: %i, inst#: %i\n",
chan->number, chan->midi_program);
#endif
}
/*
* terminate note
*/
void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
{
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "Terminate note, ch#: %i, inst#: %i\n",
chan->number, chan->midi_program);
#endif
}
static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
{
unsigned short reg_side;
unsigned char voice_offset;
unsigned short opl3_reg;
unsigned char fnum, blocknum;
struct snd_opl3_voice *vp;
if (snd_BUG_ON(voice >= MAX_OPL3_VOICES))
return;
vp = &opl3->voices[voice];
if (vp->chan == NULL)
return; /* not allocated? */
if (voice < MAX_OPL2_VOICES) {
/* Left register block for voices 0 .. 8 */
reg_side = OPL3_LEFT;
voice_offset = voice;
} else {
/* Right register block for voices 9 .. 17 */
reg_side = OPL3_RIGHT;
voice_offset = voice - MAX_OPL2_VOICES;
}
snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);
/* Set OPL3 FNUM_LOW register of requested voice */
opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
opl3->command(opl3, opl3_reg, fnum);
vp->keyon_reg = blocknum;
/* Set output sound flag */
blocknum |= OPL3_KEYON_BIT;
/* Set OPL3 KEYON_BLOCK register of requested voice */
opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
opl3->command(opl3, opl3_reg, blocknum);
vp->time = opl3->use_time++;
}
/*
* Update voice pitch controller
*/
static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
{
int voice;
struct snd_opl3_voice *vp;
unsigned long flags;
spin_lock_irqsave(&opl3->voice_lock, flags);
if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
for (voice = 0; voice < opl3->max_voices; voice++) {
vp = &opl3->voices[voice];
if (vp->state > 0 && vp->chan == chan) {
snd_opl3_update_pitch(opl3, voice);
}
}
} else {
/* remap OSS voices */
if (chan->number < MAX_OPL3_VOICES) {
voice = snd_opl3_oss_map[chan->number];
snd_opl3_update_pitch(opl3, voice);
}
}
spin_unlock_irqrestore(&opl3->voice_lock, flags);
}
/*
* Deal with a controller type event. This includes all types of
* control events, not just the midi controllers
*/
void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
{
struct snd_opl3 *opl3;
opl3 = p;
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "Controller, TYPE = %i, ch#: %i, inst#: %i\n",
type, chan->number, chan->midi_program);
#endif
switch (type) {
case MIDI_CTL_MSB_MODWHEEL:
if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
else
opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
opl3->drum_reg);
break;
case MIDI_CTL_E2_TREMOLO_DEPTH:
if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
else
opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
opl3->drum_reg);
break;
case MIDI_CTL_PITCHBEND:
snd_opl3_pitch_ctrl(opl3, chan);
break;
}
}
/*
* NRPN events
*/
void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
struct snd_midi_channel_set *chset)
{
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "NRPN, ch#: %i, inst#: %i\n",
chan->number, chan->midi_program);
#endif
}
/*
* receive sysex
*/
void snd_opl3_sysex(void *p, unsigned char *buf, int len,
int parsed, struct snd_midi_channel_set *chset)
{
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "SYSEX\n");
#endif
}
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