--- /dev/null
+/*
+ * OSS compatible sequencer driver
+ *
+ * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
+ *
+ * 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
+ */
+
+#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"
+
+
+/*
+ * 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;
+
+ if (!snd_seq_oss_synth_is_valid(dp, dev))
+ return -ENXIO;
+
+ info = &dp->synths[dev];
+ 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);
+ }
+
+ 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;
+
+ if (!snd_seq_oss_synth_is_valid(dp, dev))
+ return -ENXIO;
+
+ info = &dp->synths[dev];
+ 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);
+ }
+
+ 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_is_valid(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_is_valid(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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