| /* |
| * 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 = &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 = &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; |
| } |
| |
