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seq_oss_event.c

/*
 * 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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *ev);
static int chn_voice_event(seq_oss_devinfo_t *dp, evrec_t *event_rec, snd_seq_event_t *ev);
static int chn_common_event(seq_oss_devinfo_t *dp, evrec_t *event_rec, snd_seq_event_t *ev);
static int timing_event(seq_oss_devinfo_t *dp, evrec_t *event_rec, snd_seq_event_t *ev);
static int local_event(seq_oss_devinfo_t *dp, evrec_t *event_rec, snd_seq_event_t *ev);
static int old_event(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *ev);
static int note_on_event(seq_oss_devinfo_t *dp, int dev, int ch, int note, int vel, snd_seq_event_t *ev);
static int note_off_event(seq_oss_devinfo_t *dp, int dev, int ch, int note, int vel, snd_seq_event_t *ev);
static int set_note_event(seq_oss_devinfo_t *dp, int dev, int type, int ch, int note, int vel, snd_seq_event_t *ev);
static int set_control_event(seq_oss_devinfo_t *dp, int dev, int type, int ch, int param, int val, snd_seq_event_t *ev);
static int set_echo_event(seq_oss_devinfo_t *dp, evrec_t *rec, snd_seq_event_t *ev);


/*
 * convert an OSS event to ALSA event
 * return 0 : enqueued
 *        non-zero : invalid - ignored
 */

int
snd_seq_oss_process_event(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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 {
                  evrec_t 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(seq_oss_devinfo_t *dp, evrec_t *q, snd_seq_event_t *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(seq_oss_devinfo_t *dp, int dev, int ch, int note, int vel, snd_seq_event_t *ev)
{
      seq_oss_synthinfo_t *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(seq_oss_devinfo_t *dp, int dev, int ch, int note, int vel, snd_seq_event_t *ev)
{
      seq_oss_synthinfo_t *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(seq_oss_devinfo_t *dp, int dev, int type, int ch, int note, int vel, snd_seq_event_t *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(seq_oss_devinfo_t *dp, int dev, int type, int ch, int param, int val, snd_seq_event_t *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(seq_oss_devinfo_t *dp, evrec_t *rec, snd_seq_event_t *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(snd_seq_event_t *ev, int direct, void *private_data,
                  int atomic, int hop)
{
      seq_oss_devinfo_t *dp = (seq_oss_devinfo_t *)private_data;
      evrec_t *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 = (evrec_t*)&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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