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|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OSS compatible sequencer driver
*
* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
*/
#include "seq_oss_device.h"
#include "seq_oss_synth.h"
#include "seq_oss_midi.h"
#include "seq_oss_event.h"
#include "seq_oss_timer.h"
#include <sound/seq_oss_legacy.h>
#include "seq_oss_readq.h"
#include "seq_oss_writeq.h"
#include <linux/nospec.h>
/*
* prototypes
*/
static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
static int set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev);
static int set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev);
static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev);
/*
* convert an OSS event to ALSA event
* return 0 : enqueued
* non-zero : invalid - ignored
*/
int
snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
switch (q->s.code) {
case SEQ_EXTENDED:
return extended_event(dp, q, ev);
case EV_CHN_VOICE:
return chn_voice_event(dp, q, ev);
case EV_CHN_COMMON:
return chn_common_event(dp, q, ev);
case EV_TIMING:
return timing_event(dp, q, ev);
case EV_SEQ_LOCAL:
return local_event(dp, q, ev);
case EV_SYSEX:
return snd_seq_oss_synth_sysex(dp, q->x.dev, q->x.buf, ev);
case SEQ_MIDIPUTC:
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
/* put a midi byte */
if (! is_write_mode(dp->file_mode))
break;
if (snd_seq_oss_midi_open(dp, q->s.dev, SNDRV_SEQ_OSS_FILE_WRITE))
break;
if (snd_seq_oss_midi_filemode(dp, q->s.dev) & SNDRV_SEQ_OSS_FILE_WRITE)
return snd_seq_oss_midi_putc(dp, q->s.dev, q->s.parm1, ev);
break;
case SEQ_ECHO:
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
return set_echo_event(dp, q, ev);
case SEQ_PRIVATE:
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
return snd_seq_oss_synth_raw_event(dp, q->c[1], q->c, ev);
default:
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
return old_event(dp, q, ev);
}
return -EINVAL;
}
/* old type events: mode1 only */
static int
old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
switch (q->s.code) {
case SEQ_NOTEOFF:
return note_off_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
case SEQ_NOTEON:
return note_on_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
case SEQ_WAIT:
/* skip */
break;
case SEQ_PGMCHANGE:
return set_control_event(dp, 0, SNDRV_SEQ_EVENT_PGMCHANGE,
q->n.chn, 0, q->n.note, ev);
case SEQ_SYNCTIMER:
return snd_seq_oss_timer_reset(dp->timer);
}
return -EINVAL;
}
/* 8bytes extended event: mode1 only */
static int
extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
int val;
switch (q->e.cmd) {
case SEQ_NOTEOFF:
return note_off_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
case SEQ_NOTEON:
return note_on_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
case SEQ_PGMCHANGE:
return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
q->e.chn, 0, q->e.p1, ev);
case SEQ_AFTERTOUCH:
return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CHANPRESS,
q->e.chn, 0, q->e.p1, ev);
case SEQ_BALANCE:
/* convert -128:127 to 0:127 */
val = (char)q->e.p1;
val = (val + 128) / 2;
return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CONTROLLER,
q->e.chn, CTL_PAN, val, ev);
case SEQ_CONTROLLER:
val = ((short)q->e.p3 << 8) | (short)q->e.p2;
switch (q->e.p1) {
case CTRL_PITCH_BENDER: /* SEQ1 V2 control */
/* -0x2000:0x1fff */
return set_control_event(dp, q->e.dev,
SNDRV_SEQ_EVENT_PITCHBEND,
q->e.chn, 0, val, ev);
case CTRL_PITCH_BENDER_RANGE:
/* conversion: 100/semitone -> 128/semitone */
return set_control_event(dp, q->e.dev,
SNDRV_SEQ_EVENT_REGPARAM,
q->e.chn, 0, val*128/100, ev);
default:
return set_control_event(dp, q->e.dev,
SNDRV_SEQ_EVENT_CONTROL14,
q->e.chn, q->e.p1, val, ev);
}
case SEQ_VOLMODE:
return snd_seq_oss_synth_raw_event(dp, q->e.dev, q->c, ev);
}
return -EINVAL;
}
/* channel voice events: mode1 and 2 */
static int
chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
if (q->v.chn >= 32)
return -EINVAL;
switch (q->v.cmd) {
case MIDI_NOTEON:
return note_on_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
case MIDI_NOTEOFF:
return note_off_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
case MIDI_KEY_PRESSURE:
return set_note_event(dp, q->v.dev, SNDRV_SEQ_EVENT_KEYPRESS,
q->v.chn, q->v.note, q->v.parm, ev);
}
return -EINVAL;
}
/* channel common events: mode1 and 2 */
static int
chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
if (q->l.chn >= 32)
return -EINVAL;
switch (q->l.cmd) {
case MIDI_PGM_CHANGE:
return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
q->l.chn, 0, q->l.p1, ev);
case MIDI_CTL_CHANGE:
return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CONTROLLER,
q->l.chn, q->l.p1, q->l.val, ev);
case MIDI_PITCH_BEND:
/* conversion: 0:0x3fff -> -0x2000:0x1fff */
return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PITCHBEND,
q->l.chn, 0, q->l.val - 8192, ev);
case MIDI_CHN_PRESSURE:
return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CHANPRESS,
q->l.chn, 0, q->l.val, ev);
}
return -EINVAL;
}
/* timer events: mode1 and mode2 */
static int
timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
switch (q->t.cmd) {
case TMR_ECHO:
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return set_echo_event(dp, q, ev);
else {
union evrec tmp;
memset(&tmp, 0, sizeof(tmp));
/* XXX: only for little-endian! */
tmp.echo = (q->t.time << 8) | SEQ_ECHO;
return set_echo_event(dp, &tmp, ev);
}
case TMR_STOP:
if (dp->seq_mode)
return snd_seq_oss_timer_stop(dp->timer);
return 0;
case TMR_CONTINUE:
if (dp->seq_mode)
return snd_seq_oss_timer_continue(dp->timer);
return 0;
case TMR_TEMPO:
if (dp->seq_mode)
return snd_seq_oss_timer_tempo(dp->timer, q->t.time);
return 0;
}
return -EINVAL;
}
/* local events: mode1 and 2 */
static int
local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
{
return -EINVAL;
}
/*
* process note-on event for OSS synth
* three different modes are available:
* - SNDRV_SEQ_OSS_PROCESS_EVENTS (for one-voice per channel mode)
* Accept note 255 as volume change.
* - SNDRV_SEQ_OSS_PASS_EVENTS
* Pass all events to lowlevel driver anyway
* - SNDRV_SEQ_OSS_PROCESS_KEYPRESS (mostly for Emu8000)
* Use key-pressure if note >= 128
*/
static int
note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
{
struct seq_oss_synthinfo *info;
info = snd_seq_oss_synth_info(dp, dev);
if (!info)
return -ENXIO;
switch (info->arg.event_passing) {
case SNDRV_SEQ_OSS_PROCESS_EVENTS:
if (! info->ch || ch < 0 || ch >= info->nr_voices) {
/* pass directly */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
}
ch = array_index_nospec(ch, info->nr_voices);
if (note == 255 && info->ch[ch].note >= 0) {
/* volume control */
int type;
//if (! vel)
/* set volume to zero -- note off */
// type = SNDRV_SEQ_EVENT_NOTEOFF;
//else
if (info->ch[ch].vel)
/* sample already started -- volume change */
type = SNDRV_SEQ_EVENT_KEYPRESS;
else
/* sample not started -- start now */
type = SNDRV_SEQ_EVENT_NOTEON;
info->ch[ch].vel = vel;
return set_note_event(dp, dev, type, ch, info->ch[ch].note, vel, ev);
} else if (note >= 128)
return -EINVAL; /* invalid */
if (note != info->ch[ch].note && info->ch[ch].note >= 0)
/* note changed - note off at beginning */
set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, info->ch[ch].note, 0, ev);
/* set current status */
info->ch[ch].note = note;
info->ch[ch].vel = vel;
if (vel) /* non-zero velocity - start the note now */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
return -EINVAL;
case SNDRV_SEQ_OSS_PASS_EVENTS:
/* pass the event anyway */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
if (note >= 128) /* key pressure: shifted by 128 */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_KEYPRESS, ch, note - 128, vel, ev);
else /* normal note-on event */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
}
return -EINVAL;
}
/*
* process note-off event for OSS synth
*/
static int
note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
{
struct seq_oss_synthinfo *info;
info = snd_seq_oss_synth_info(dp, dev);
if (!info)
return -ENXIO;
switch (info->arg.event_passing) {
case SNDRV_SEQ_OSS_PROCESS_EVENTS:
if (! info->ch || ch < 0 || ch >= info->nr_voices) {
/* pass directly */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
}
ch = array_index_nospec(ch, info->nr_voices);
if (info->ch[ch].note >= 0) {
note = info->ch[ch].note;
info->ch[ch].vel = 0;
info->ch[ch].note = -1;
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
}
return -EINVAL; /* invalid */
case SNDRV_SEQ_OSS_PASS_EVENTS:
case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
/* pass the event anyway */
return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
}
return -EINVAL;
}
/*
* create a note event
*/
static int
set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev)
{
if (!snd_seq_oss_synth_info(dp, dev))
return -ENXIO;
ev->type = type;
snd_seq_oss_synth_addr(dp, dev, ev);
ev->data.note.channel = ch;
ev->data.note.note = note;
ev->data.note.velocity = vel;
return 0;
}
/*
* create a control event
*/
static int
set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev)
{
if (!snd_seq_oss_synth_info(dp, dev))
return -ENXIO;
ev->type = type;
snd_seq_oss_synth_addr(dp, dev, ev);
ev->data.control.channel = ch;
ev->data.control.param = param;
ev->data.control.value = val;
return 0;
}
/*
* create an echo event
*/
static int
set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev)
{
ev->type = SNDRV_SEQ_EVENT_ECHO;
/* echo back to itself */
snd_seq_oss_fill_addr(dp, ev, dp->addr.client, dp->addr.port);
memcpy(&ev->data, rec, LONG_EVENT_SIZE);
return 0;
}
/*
* event input callback from ALSA sequencer:
* the echo event is processed here.
*/
int
snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data,
int atomic, int hop)
{
struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
union evrec *rec;
if (ev->type != SNDRV_SEQ_EVENT_ECHO)
return snd_seq_oss_midi_input(ev, direct, private_data);
if (ev->source.client != dp->cseq)
return 0; /* ignored */
rec = (union evrec*)&ev->data;
if (rec->s.code == SEQ_SYNCTIMER) {
/* sync echo back */
snd_seq_oss_writeq_wakeup(dp->writeq, rec->t.time);
} else {
/* echo back event */
if (dp->readq == NULL)
return 0;
snd_seq_oss_readq_put_event(dp->readq, rec);
}
return 0;
}
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