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linux/sound/drivers/opl3/opl3_midi.c
Takashi Iwai a8d09e3a6d ALSA: opl3: Fix possible negative array index access 
Spotted by coverity CID 115196.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
2013-10-29 15:07:19 +01:00

887 lines
22 KiB
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/*
* Copyright (c) by Uros Bizjak <uros@kss-loka.si>
*
* Midi synth routines for OPL2/OPL3/OPL4 FM
*
* 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
*
*/
#undef DEBUG_ALLOC
#undef DEBUG_MIDI
#include "opl3_voice.h"
#include <sound/asoundef.h>
extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];
extern bool use_internal_drums;
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 > 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("%c", *(str + opl3->voices[i].state + 1));
printk("\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(unsigned long data)
{
struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
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) {
opl3->tlist.expires = jiffies + 1; /* invoke again */
add_timer(&opl3->tlist);
} 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) {
opl3->tlist.expires = jiffies + 1;
add_timer(&opl3->tlist);
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;
}
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)
{
struct snd_opl3 *opl3;
opl3 = p;
#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)
{
struct snd_opl3 *opl3;
opl3 = p;
#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)
{
struct snd_opl3 *opl3;
opl3 = p;
#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)
{
struct snd_opl3 *opl3;
opl3 = p;
#ifdef DEBUG_MIDI
snd_printk(KERN_DEBUG "SYSEX\n");
#endif
}
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