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linux-stable/sound/synth/emux/emux_synth.c
Takashi Iwai 55a6921bf1 ALSA: emux: More constifications 
Apply const prefix to each possible place: the MIDI data definitions,
the static tables for volume parameters, etc.

Just for minor optimization and no functional changes.

Link: https://lore.kernel.org/r/20200105144823.29547-22-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-01-05 16:14:46 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Midi synth routines for the Emu8k/Emu10k1
*
* Copyright (C) 1999 Steve Ratcliffe
* Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
*
* Contains code based on awe_wave.c by Takashi Iwai
*/
#include <linux/export.h>
#include "emux_voice.h"
#include <sound/asoundef.h>
/*
* Prototypes
*/
/*
* Ensure a value is between two points
* macro evaluates its args more than once, so changed to upper-case.
*/
#define LIMITVALUE(x, a, b) do { if ((x) < (a)) (x) = (a); else if ((x) > (b)) (x) = (b); } while (0)
#define LIMITMAX(x, a) do {if ((x) > (a)) (x) = (a); } while (0)
static int get_zone(struct snd_emux *emu, struct snd_emux_port *port,
int *notep, int vel, struct snd_midi_channel *chan,
struct snd_sf_zone **table);
static int get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan);
static void terminate_note1(struct snd_emux *emu, int note,
struct snd_midi_channel *chan, int free);
static void exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port,
int exclass);
static void terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free);
static void update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update);
static void setup_voice(struct snd_emux_voice *vp);
static int calc_pan(struct snd_emux_voice *vp);
static int calc_volume(struct snd_emux_voice *vp);
static int calc_pitch(struct snd_emux_voice *vp);
/*
* Start a note.
*/
void
snd_emux_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
{
struct snd_emux *emu;
int i, key, nvoices;
struct snd_emux_voice *vp;
struct snd_sf_zone *table[SNDRV_EMUX_MAX_MULTI_VOICES];
unsigned long flags;
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.get_voice || !emu->ops.trigger))
return;
key = note; /* remember the original note */
nvoices = get_zone(emu, port, &note, vel, chan, table);
if (! nvoices)
return;
/* exclusive note off */
for (i = 0; i < nvoices; i++) {
struct snd_sf_zone *zp = table[i];
if (zp && zp->v.exclusiveClass)
exclusive_note_off(emu, port, zp->v.exclusiveClass);
}
#if 0 // seems not necessary
/* Turn off the same note on the same channel. */
terminate_note1(emu, key, chan, 0);
#endif
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < nvoices; i++) {
/* set up each voice parameter */
/* at this stage, we don't trigger the voice yet. */
if (table[i] == NULL)
continue;
vp = emu->ops.get_voice(emu, port);
if (vp == NULL || vp->ch < 0)
continue;
if (STATE_IS_PLAYING(vp->state))
emu->ops.terminate(vp);
vp->time = emu->use_time++;
vp->chan = chan;
vp->port = port;
vp->key = key;
vp->note = note;
vp->velocity = vel;
vp->zone = table[i];
if (vp->zone->sample)
vp->block = vp->zone->sample->block;
else
vp->block = NULL;
setup_voice(vp);
vp->state = SNDRV_EMUX_ST_STANDBY;
if (emu->ops.prepare) {
vp->state = SNDRV_EMUX_ST_OFF;
if (emu->ops.prepare(vp) >= 0)
vp->state = SNDRV_EMUX_ST_STANDBY;
}
}
/* start envelope now */
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (vp->state == SNDRV_EMUX_ST_STANDBY &&
vp->chan == chan) {
emu->ops.trigger(vp);
vp->state = SNDRV_EMUX_ST_ON;
vp->ontime = jiffies; /* remember the trigger timing */
}
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) {
/* clear voice position for the next note on this channel */
struct snd_emux_effect_table *fx = chan->private;
if (fx) {
fx->flag[EMUX_FX_SAMPLE_START] = 0;
fx->flag[EMUX_FX_COARSE_SAMPLE_START] = 0;
}
}
#endif
}
/*
* Release a note in response to a midi note off.
*/
void
snd_emux_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
{
int ch;
struct snd_emux *emu;
struct snd_emux_voice *vp;
unsigned long flags;
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.release))
return;
spin_lock_irqsave(&emu->voice_lock, flags);
for (ch = 0; ch < emu->max_voices; ch++) {
vp = &emu->voices[ch];
if (STATE_IS_PLAYING(vp->state) &&
vp->chan == chan && vp->key == note) {
vp->state = SNDRV_EMUX_ST_RELEASED;
if (vp->ontime == jiffies) {
/* if note-off is sent too shortly after
* note-on, emuX engine cannot produce the sound
* correctly. so we'll release this note
* a bit later via timer callback.
*/
vp->state = SNDRV_EMUX_ST_PENDING;
if (! emu->timer_active) {
mod_timer(&emu->tlist, jiffies + 1);
emu->timer_active = 1;
}
} else
/* ok now release the note */
emu->ops.release(vp);
}
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* timer callback
*
* release the pending note-offs
*/
void snd_emux_timer_callback(struct timer_list *t)
{
struct snd_emux *emu = from_timer(emu, t, tlist);
struct snd_emux_voice *vp;
unsigned long flags;
int ch, do_again = 0;
spin_lock_irqsave(&emu->voice_lock, flags);
for (ch = 0; ch < emu->max_voices; ch++) {
vp = &emu->voices[ch];
if (vp->state == SNDRV_EMUX_ST_PENDING) {
if (vp->ontime == jiffies)
do_again++; /* release this at the next interrupt */
else {
emu->ops.release(vp);
vp->state = SNDRV_EMUX_ST_RELEASED;
}
}
}
if (do_again) {
mod_timer(&emu->tlist, jiffies + 1);
emu->timer_active = 1;
} else
emu->timer_active = 0;
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* key pressure change
*/
void
snd_emux_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
{
int ch;
struct snd_emux *emu;
struct snd_emux_voice *vp;
unsigned long flags;
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.update))
return;
spin_lock_irqsave(&emu->voice_lock, flags);
for (ch = 0; ch < emu->max_voices; ch++) {
vp = &emu->voices[ch];
if (vp->state == SNDRV_EMUX_ST_ON &&
vp->chan == chan && vp->key == note) {
vp->velocity = vel;
update_voice(emu, vp, SNDRV_EMUX_UPDATE_VOLUME);
}
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* Modulate the voices which belong to the channel
*/
void
snd_emux_update_channel(struct snd_emux_port *port, struct snd_midi_channel *chan, int update)
{
struct snd_emux *emu;
struct snd_emux_voice *vp;
int i;
unsigned long flags;
if (! update)
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.update))
return;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (vp->chan == chan)
update_voice(emu, vp, update);
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* Modulate all the voices which belong to the port.
*/
void
snd_emux_update_port(struct snd_emux_port *port, int update)
{
struct snd_emux *emu;
struct snd_emux_voice *vp;
int i;
unsigned long flags;
if (! update)
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.update))
return;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (vp->port == port)
update_voice(emu, vp, update);
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* Deal with a controller type event. This includes all types of
* control events, not just the midi controllers
*/
void
snd_emux_control(void *p, int type, struct snd_midi_channel *chan)
{
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
switch (type) {
case MIDI_CTL_MSB_MAIN_VOLUME:
case MIDI_CTL_MSB_EXPRESSION:
snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_VOLUME);
break;
case MIDI_CTL_MSB_PAN:
snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PAN);
break;
case MIDI_CTL_SOFT_PEDAL:
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
/* FIXME: this is an emulation */
if (chan->control[type] >= 64)
snd_emux_send_effect(port, chan, EMUX_FX_CUTOFF, -160,
EMUX_FX_FLAG_ADD);
else
snd_emux_send_effect(port, chan, EMUX_FX_CUTOFF, 0,
EMUX_FX_FLAG_OFF);
#endif
break;
case MIDI_CTL_PITCHBEND:
snd_emux_update_channel(port, chan, SNDRV_EMUX_UPDATE_PITCH);
break;
case MIDI_CTL_MSB_MODWHEEL:
case MIDI_CTL_CHAN_PRESSURE:
snd_emux_update_channel(port, chan,
SNDRV_EMUX_UPDATE_FMMOD |
SNDRV_EMUX_UPDATE_FM2FRQ2);
break;
}
if (port->chset.midi_mode == SNDRV_MIDI_MODE_XG) {
snd_emux_xg_control(port, chan, type);
}
}
/*
* terminate note - if free flag is true, free the terminated voice
*/
static void
terminate_note1(struct snd_emux *emu, int note, struct snd_midi_channel *chan, int free)
{
int i;
struct snd_emux_voice *vp;
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (STATE_IS_PLAYING(vp->state) && vp->chan == chan &&
vp->key == note)
terminate_voice(emu, vp, free);
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* terminate note - exported for midi emulation
*/
void
snd_emux_terminate_note(void *p, int note, struct snd_midi_channel *chan)
{
struct snd_emux *emu;
struct snd_emux_port *port;
port = p;
if (snd_BUG_ON(!port || !chan))
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.terminate))
return;
terminate_note1(emu, note, chan, 1);
}
/*
* Terminate all the notes
*/
void
snd_emux_terminate_all(struct snd_emux *emu)
{
int i;
struct snd_emux_voice *vp;
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (STATE_IS_PLAYING(vp->state))
terminate_voice(emu, vp, 0);
if (vp->state == SNDRV_EMUX_ST_OFF) {
if (emu->ops.free_voice)
emu->ops.free_voice(vp);
if (emu->ops.reset)
emu->ops.reset(emu, i);
}
vp->time = 0;
}
/* initialize allocation time */
emu->use_time = 0;
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
EXPORT_SYMBOL(snd_emux_terminate_all);
/*
* Terminate all voices associated with the given port
*/
void
snd_emux_sounds_off_all(struct snd_emux_port *port)
{
int i;
struct snd_emux *emu;
struct snd_emux_voice *vp;
unsigned long flags;
if (snd_BUG_ON(!port))
return;
emu = port->emu;
if (snd_BUG_ON(!emu || !emu->ops.terminate))
return;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (STATE_IS_PLAYING(vp->state) &&
vp->port == port)
terminate_voice(emu, vp, 0);
if (vp->state == SNDRV_EMUX_ST_OFF) {
if (emu->ops.free_voice)
emu->ops.free_voice(vp);
if (emu->ops.reset)
emu->ops.reset(emu, i);
}
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* Terminate all voices that have the same exclusive class. This
* is mainly for drums.
*/
static void
exclusive_note_off(struct snd_emux *emu, struct snd_emux_port *port, int exclass)
{
struct snd_emux_voice *vp;
int i;
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
if (STATE_IS_PLAYING(vp->state) && vp->port == port &&
vp->reg.exclusiveClass == exclass) {
terminate_voice(emu, vp, 0);
}
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
* terminate a voice
* if free flag is true, call free_voice after termination
*/
static void
terminate_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int free)
{
emu->ops.terminate(vp);
vp->time = emu->use_time++;
vp->chan = NULL;
vp->port = NULL;
vp->zone = NULL;
vp->block = NULL;
vp->state = SNDRV_EMUX_ST_OFF;
if (free && emu->ops.free_voice)
emu->ops.free_voice(vp);
}
/*
* Modulate the voice
*/
static void
update_voice(struct snd_emux *emu, struct snd_emux_voice *vp, int update)
{
if (!STATE_IS_PLAYING(vp->state))
return;
if (vp->chan == NULL || vp->port == NULL)
return;
if (update & SNDRV_EMUX_UPDATE_VOLUME)
calc_volume(vp);
if (update & SNDRV_EMUX_UPDATE_PITCH)
calc_pitch(vp);
if (update & SNDRV_EMUX_UPDATE_PAN) {
if (! calc_pan(vp) && (update == SNDRV_EMUX_UPDATE_PAN))
return;
}
emu->ops.update(vp, update);
}
#if 0 // not used
/* table for volume target calculation */
static const unsigned short voltarget[16] = {
0xEAC0, 0xE0C8, 0xD740, 0xCE20, 0xC560, 0xBD08, 0xB500, 0xAD58,
0xA5F8, 0x9EF0, 0x9830, 0x91C0, 0x8B90, 0x85A8, 0x8000, 0x7A90
};
#endif
#define LO_BYTE(v) ((v) & 0xff)
#define HI_BYTE(v) (((v) >> 8) & 0xff)
/*
* Sets up the voice structure by calculating some values that
* will be needed later.
*/
static void
setup_voice(struct snd_emux_voice *vp)
{
struct soundfont_voice_parm *parm;
int pitch;
/* copy the original register values */
vp->reg = vp->zone->v;
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
snd_emux_setup_effect(vp);
#endif
/* reset status */
vp->apan = -1;
vp->avol = -1;
vp->apitch = -1;
calc_volume(vp);
calc_pitch(vp);
calc_pan(vp);
parm = &vp->reg.parm;
/* compute filter target and correct modulation parameters */
if (LO_BYTE(parm->modatkhld) >= 0x80 && parm->moddelay >= 0x8000) {
parm->moddelay = 0xbfff;
pitch = (HI_BYTE(parm->pefe) << 4) + vp->apitch;
if (pitch > 0xffff)
pitch = 0xffff;
/* calculate filter target */
vp->ftarget = parm->cutoff + LO_BYTE(parm->pefe);
LIMITVALUE(vp->ftarget, 0, 255);
vp->ftarget <<= 8;
} else {
vp->ftarget = parm->cutoff;
vp->ftarget <<= 8;
pitch = vp->apitch;
}
/* compute pitch target */
if (pitch != 0xffff) {
vp->ptarget = 1 << (pitch >> 12);
if (pitch & 0x800) vp->ptarget += (vp->ptarget*0x102e)/0x2710;
if (pitch & 0x400) vp->ptarget += (vp->ptarget*0x764)/0x2710;
if (pitch & 0x200) vp->ptarget += (vp->ptarget*0x389)/0x2710;
vp->ptarget += (vp->ptarget >> 1);
if (vp->ptarget > 0xffff) vp->ptarget = 0xffff;
} else
vp->ptarget = 0xffff;
if (LO_BYTE(parm->modatkhld) >= 0x80) {
parm->modatkhld &= ~0xff;
parm->modatkhld |= 0x7f;
}
/* compute volume target and correct volume parameters */
vp->vtarget = 0;
#if 0 /* FIXME: this leads to some clicks.. */
if (LO_BYTE(parm->volatkhld) >= 0x80 && parm->voldelay >= 0x8000) {
parm->voldelay = 0xbfff;
vp->vtarget = voltarget[vp->avol % 0x10] >> (vp->avol >> 4);
}
#endif
if (LO_BYTE(parm->volatkhld) >= 0x80) {
parm->volatkhld &= ~0xff;
parm->volatkhld |= 0x7f;
}
}
/*
* calculate pitch parameter
*/
static const unsigned char pan_volumes[256] = {
0x00,0x03,0x06,0x09,0x0c,0x0f,0x12,0x14,0x17,0x1a,0x1d,0x20,0x22,0x25,0x28,0x2a,
0x2d,0x30,0x32,0x35,0x37,0x3a,0x3c,0x3f,0x41,0x44,0x46,0x49,0x4b,0x4d,0x50,0x52,
0x54,0x57,0x59,0x5b,0x5d,0x60,0x62,0x64,0x66,0x68,0x6a,0x6c,0x6f,0x71,0x73,0x75,
0x77,0x79,0x7b,0x7c,0x7e,0x80,0x82,0x84,0x86,0x88,0x89,0x8b,0x8d,0x8f,0x90,0x92,
0x94,0x96,0x97,0x99,0x9a,0x9c,0x9e,0x9f,0xa1,0xa2,0xa4,0xa5,0xa7,0xa8,0xaa,0xab,
0xad,0xae,0xaf,0xb1,0xb2,0xb3,0xb5,0xb6,0xb7,0xb9,0xba,0xbb,0xbc,0xbe,0xbf,0xc0,
0xc1,0xc2,0xc3,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,0xcd,0xce,0xcf,0xd0,0xd1,
0xd2,0xd3,0xd4,0xd5,0xd6,0xd7,0xd7,0xd8,0xd9,0xda,0xdb,0xdc,0xdc,0xdd,0xde,0xdf,
0xdf,0xe0,0xe1,0xe2,0xe2,0xe3,0xe4,0xe4,0xe5,0xe6,0xe6,0xe7,0xe8,0xe8,0xe9,0xe9,
0xea,0xeb,0xeb,0xec,0xec,0xed,0xed,0xee,0xee,0xef,0xef,0xf0,0xf0,0xf1,0xf1,0xf1,
0xf2,0xf2,0xf3,0xf3,0xf3,0xf4,0xf4,0xf5,0xf5,0xf5,0xf6,0xf6,0xf6,0xf7,0xf7,0xf7,
0xf7,0xf8,0xf8,0xf8,0xf9,0xf9,0xf9,0xf9,0xf9,0xfa,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,
0xfb,0xfb,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfc,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,0xfd,
0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,
};
static int
calc_pan(struct snd_emux_voice *vp)
{
struct snd_midi_channel *chan = vp->chan;
int pan;
/* pan & loop start (pan 8bit, MSB, 0:right, 0xff:left) */
if (vp->reg.fixpan > 0) /* 0-127 */
pan = 255 - (int)vp->reg.fixpan * 2;
else {
pan = chan->control[MIDI_CTL_MSB_PAN] - 64;
if (vp->reg.pan >= 0) /* 0-127 */
pan += vp->reg.pan - 64;
pan = 127 - (int)pan * 2;
}
LIMITVALUE(pan, 0, 255);
if (vp->emu->linear_panning) {
/* assuming linear volume */
if (pan != vp->apan) {
vp->apan = pan;
if (pan == 0)
vp->aaux = 0xff;
else
vp->aaux = (-pan) & 0xff;
return 1;
} else
return 0;
} else {
/* using volume table */
if (vp->apan != (int)pan_volumes[pan]) {
vp->apan = pan_volumes[pan];
vp->aaux = pan_volumes[255 - pan];
return 1;
}
return 0;
}
}
/*
* calculate volume attenuation
*
* Voice volume is controlled by volume attenuation parameter.
* So volume becomes maximum when avol is 0 (no attenuation), and
* minimum when 255 (-96dB or silence).
*/
/* tables for volume->attenuation calculation */
static const unsigned char voltab1[128] = {
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x2b, 0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22,
0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a,
0x19, 0x19, 0x18, 0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x14,
0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10,
0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0e, 0x0d,
0x0d, 0x0d, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b,
0x0b, 0x0a, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09,
0x08, 0x08, 0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06,
0x06, 0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x04,
0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03, 0x03, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const unsigned char voltab2[128] = {
0x32, 0x31, 0x30, 0x2f, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x2a,
0x29, 0x28, 0x27, 0x26, 0x25, 0x24, 0x24, 0x23, 0x22, 0x21,
0x21, 0x20, 0x1f, 0x1e, 0x1e, 0x1d, 0x1c, 0x1c, 0x1b, 0x1a,
0x1a, 0x19, 0x19, 0x18, 0x18, 0x17, 0x16, 0x16, 0x15, 0x15,
0x14, 0x14, 0x13, 0x13, 0x13, 0x12, 0x12, 0x11, 0x11, 0x10,
0x10, 0x10, 0x0f, 0x0f, 0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d,
0x0d, 0x0c, 0x0c, 0x0c, 0x0b, 0x0b, 0x0b, 0x0b, 0x0a, 0x0a,
0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09, 0x09, 0x08, 0x08, 0x08,
0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06,
0x06, 0x06, 0x06, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05, 0x05,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03, 0x03, 0x03, 0x03,
0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const unsigned char expressiontab[128] = {
0x7f, 0x6c, 0x62, 0x5a, 0x54, 0x50, 0x4b, 0x48, 0x45, 0x42,
0x40, 0x3d, 0x3b, 0x39, 0x38, 0x36, 0x34, 0x33, 0x31, 0x30,
0x2f, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, 0x28, 0x27, 0x26, 0x25,
0x24, 0x24, 0x23, 0x22, 0x21, 0x21, 0x20, 0x1f, 0x1e, 0x1e,
0x1d, 0x1d, 0x1c, 0x1b, 0x1b, 0x1a, 0x1a, 0x19, 0x18, 0x18,
0x17, 0x17, 0x16, 0x16, 0x15, 0x15, 0x15, 0x14, 0x14, 0x13,
0x13, 0x12, 0x12, 0x11, 0x11, 0x11, 0x10, 0x10, 0x0f, 0x0f,
0x0f, 0x0e, 0x0e, 0x0e, 0x0d, 0x0d, 0x0d, 0x0c, 0x0c, 0x0c,
0x0b, 0x0b, 0x0b, 0x0a, 0x0a, 0x0a, 0x09, 0x09, 0x09, 0x09,
0x08, 0x08, 0x08, 0x07, 0x07, 0x07, 0x07, 0x06, 0x06, 0x06,
0x06, 0x05, 0x05, 0x05, 0x04, 0x04, 0x04, 0x04, 0x04, 0x03,
0x03, 0x03, 0x03, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01,
0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
/*
* Magic to calculate the volume (actually attenuation) from all the
* voice and channels parameters.
*/
static int
calc_volume(struct snd_emux_voice *vp)
{
int vol;
int main_vol, expression_vol, master_vol;
struct snd_midi_channel *chan = vp->chan;
struct snd_emux_port *port = vp->port;
expression_vol = chan->control[MIDI_CTL_MSB_EXPRESSION];
LIMITMAX(vp->velocity, 127);
LIMITVALUE(expression_vol, 0, 127);
if (port->port_mode == SNDRV_EMUX_PORT_MODE_OSS_SYNTH) {
/* 0 - 127 */
main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME];
vol = (vp->velocity * main_vol * expression_vol) / (127*127);
vol = vol * vp->reg.amplitude / 127;
LIMITVALUE(vol, 0, 127);
/* calc to attenuation */
vol = snd_sf_vol_table[vol];
} else {
main_vol = chan->control[MIDI_CTL_MSB_MAIN_VOLUME] * vp->reg.amplitude / 127;
LIMITVALUE(main_vol, 0, 127);
vol = voltab1[main_vol] + voltab2[vp->velocity];
vol = (vol * 8) / 3;
vol += vp->reg.attenuation;
vol += ((0x100 - vol) * expressiontab[expression_vol])/128;
}
master_vol = port->chset.gs_master_volume;
LIMITVALUE(master_vol, 0, 127);
vol += snd_sf_vol_table[master_vol];
vol += port->volume_atten;
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
if (chan->private) {
struct snd_emux_effect_table *fx = chan->private;
vol += fx->val[EMUX_FX_ATTEN];
}
#endif
LIMITVALUE(vol, 0, 255);
if (vp->avol == vol)
return 0; /* value unchanged */
vp->avol = vol;
if (!SF_IS_DRUM_BANK(get_bank(port, chan))
&& LO_BYTE(vp->reg.parm.volatkhld) < 0x7d) {
int atten;
if (vp->velocity < 70)
atten = 70;
else
atten = vp->velocity;
vp->acutoff = (atten * vp->reg.parm.cutoff + 0xa0) >> 7;
} else {
vp->acutoff = vp->reg.parm.cutoff;
}
return 1; /* value changed */
}
/*
* calculate pitch offset
*
* 0xE000 is no pitch offset at 44100Hz sample.
* Every 4096 is one octave.
*/
static int
calc_pitch(struct snd_emux_voice *vp)
{
struct snd_midi_channel *chan = vp->chan;
int offset;
/* calculate offset */
if (vp->reg.fixkey >= 0) {
offset = (vp->reg.fixkey - vp->reg.root) * 4096 / 12;
} else {
offset = (vp->note - vp->reg.root) * 4096 / 12;
}
offset = (offset * vp->reg.scaleTuning) / 100;
offset += vp->reg.tune * 4096 / 1200;
if (chan->midi_pitchbend != 0) {
/* (128 * 8192: 1 semitone) ==> (4096: 12 semitones) */
offset += chan->midi_pitchbend * chan->gm_rpn_pitch_bend_range / 3072;
}
/* tuning via RPN:
* coarse = -8192 to 8192 (100 cent per 128)
* fine = -8192 to 8192 (max=100cent)
*/
/* 4096 = 1200 cents in emu8000 parameter */
offset += chan->gm_rpn_coarse_tuning * 4096 / (12 * 128);
offset += chan->gm_rpn_fine_tuning / 24;
#ifdef SNDRV_EMUX_USE_RAW_EFFECT
/* add initial pitch correction */
if (chan->private) {
struct snd_emux_effect_table *fx = chan->private;
if (fx->flag[EMUX_FX_INIT_PITCH])
offset += fx->val[EMUX_FX_INIT_PITCH];
}
#endif
/* 0xe000: root pitch */
offset += 0xe000 + vp->reg.rate_offset;
offset += vp->emu->pitch_shift;
LIMITVALUE(offset, 0, 0xffff);
if (offset == vp->apitch)
return 0; /* unchanged */
vp->apitch = offset;
return 1; /* value changed */
}
/*
* Get the bank number assigned to the channel
*/
static int
get_bank(struct snd_emux_port *port, struct snd_midi_channel *chan)
{
int val;
switch (port->chset.midi_mode) {
case SNDRV_MIDI_MODE_XG:
val = chan->control[MIDI_CTL_MSB_BANK];
if (val == 127)
return 128; /* return drum bank */
return chan->control[MIDI_CTL_LSB_BANK];
case SNDRV_MIDI_MODE_GS:
if (chan->drum_channel)
return 128;
/* ignore LSB (bank map) */
return chan->control[MIDI_CTL_MSB_BANK];
default:
if (chan->drum_channel)
return 128;
return chan->control[MIDI_CTL_MSB_BANK];
}
}
/* Look for the zones matching with the given note and velocity.
* The resultant zones are stored on table.
*/
static int
get_zone(struct snd_emux *emu, struct snd_emux_port *port,
int *notep, int vel, struct snd_midi_channel *chan,
struct snd_sf_zone **table)
{
int preset, bank, def_preset, def_bank;
bank = get_bank(port, chan);
preset = chan->midi_program;
if (SF_IS_DRUM_BANK(bank)) {
def_preset = port->ctrls[EMUX_MD_DEF_DRUM];
def_bank = bank;
} else {
def_preset = preset;
def_bank = port->ctrls[EMUX_MD_DEF_BANK];
}
return snd_soundfont_search_zone(emu->sflist, notep, vel, preset, bank,
def_preset, def_bank,
table, SNDRV_EMUX_MAX_MULTI_VOICES);
}
/*
*/
void
snd_emux_init_voices(struct snd_emux *emu)
{
struct snd_emux_voice *vp;
int i;
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
for (i = 0; i < emu->max_voices; i++) {
vp = &emu->voices[i];
vp->ch = -1; /* not used */
vp->state = SNDRV_EMUX_ST_OFF;
vp->chan = NULL;
vp->port = NULL;
vp->time = 0;
vp->emu = emu;
vp->hw = emu->hw;
}
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
/*
*/
void snd_emux_lock_voice(struct snd_emux *emu, int voice)
{
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
if (emu->voices[voice].state == SNDRV_EMUX_ST_OFF)
emu->voices[voice].state = SNDRV_EMUX_ST_LOCKED;
else
snd_printk(KERN_WARNING
"invalid voice for lock %d (state = %x)\n",
voice, emu->voices[voice].state);
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
EXPORT_SYMBOL(snd_emux_lock_voice);
/*
*/
void snd_emux_unlock_voice(struct snd_emux *emu, int voice)
{
unsigned long flags;
spin_lock_irqsave(&emu->voice_lock, flags);
if (emu->voices[voice].state == SNDRV_EMUX_ST_LOCKED)
emu->voices[voice].state = SNDRV_EMUX_ST_OFF;
else
snd_printk(KERN_WARNING
"invalid voice for unlock %d (state = %x)\n",
voice, emu->voices[voice].state);
spin_unlock_irqrestore(&emu->voice_lock, flags);
}
EXPORT_SYMBOL(snd_emux_unlock_voice);
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