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opl3_midi.c

/*
 *  Copyright (c) by Uros Bizjak <uros@kss-loka.si>
 *
 *  Midi synth routines for OPL2/OPL3/OPL4 FM
 *
 *   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
 *
 */

#undef DEBUG_ALLOC
#undef DEBUG_MIDI

#include "opl3_voice.h"
#include <sound/asoundef.h>

extern char snd_opl3_regmap[MAX_OPL2_VOICES][4];

extern int use_internal_drums;

/*
 * The next table looks magical, but it certainly is not. Its values have
 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
 * for i=0. This log-table converts a linear volume-scaling (0..127) to a
 * logarithmic scaling as present in the FM-synthesizer chips. so :    Volume
 * 64 =  0 db = relative volume  0 and:    Volume 32 = -6 db = relative
 * volume -8 it was implemented as a table because it is only 128 bytes and
 * it saves a lot of log() calculations. (Rob Hooft <hooft@chem.ruu.nl>)
 */

static char opl3_volume_table[128] =
{
      -63, -48, -40, -35, -32, -29, -27, -26,
      -24, -23, -21, -20, -19, -18, -18, -17,
      -16, -15, -15, -14, -13, -13, -12, -12,
      -11, -11, -10, -10, -10, -9, -9, -8,
      -8, -8, -7, -7, -7, -6, -6, -6,
      -5, -5, -5, -5, -4, -4, -4, -4,
      -3, -3, -3, -3, -2, -2, -2, -2,
      -2, -1, -1, -1, -1, 0, 0, 0,
      0, 0, 0, 1, 1, 1, 1, 1,
      1, 2, 2, 2, 2, 2, 2, 2,
      3, 3, 3, 3, 3, 3, 3, 4,
      4, 4, 4, 4, 4, 4, 4, 5,
      5, 5, 5, 5, 5, 5, 5, 5,
      6, 6, 6, 6, 6, 6, 6, 6,
      6, 7, 7, 7, 7, 7, 7, 7,
      7, 7, 7, 8, 8, 8, 8, 8
};

void snd_opl3_calc_volume(unsigned char *volbyte, int vel,
                    struct snd_midi_channel *chan)
{
      int oldvol, newvol, n;
      int volume;

      volume = (vel * chan->gm_volume * chan->gm_expression) / (127*127);
      if (volume > 127)
            volume = 127;

      oldvol = OPL3_TOTAL_LEVEL_MASK - (*volbyte & OPL3_TOTAL_LEVEL_MASK);

      newvol = opl3_volume_table[volume] + oldvol;
      if (newvol > OPL3_TOTAL_LEVEL_MASK)
            newvol = OPL3_TOTAL_LEVEL_MASK;
      else if (newvol < 0)
            newvol = 0;

      n = OPL3_TOTAL_LEVEL_MASK - (newvol & OPL3_TOTAL_LEVEL_MASK);

      *volbyte = (*volbyte & OPL3_KSL_MASK) | (n & OPL3_TOTAL_LEVEL_MASK);
}

/*
 * Converts the note frequency to block and fnum values for the FM chip
 */
static short opl3_note_table[16] =
{
      305, 323,   /* for pitch bending, -2 semitones */
      343, 363, 385, 408, 432, 458, 485, 514, 544, 577, 611, 647,
      686, 726    /* for pitch bending, +2 semitones */
};

static void snd_opl3_calc_pitch(unsigned char *fnum, unsigned char *blocknum,
                        int note, struct snd_midi_channel *chan)
{
      int block = ((note / 12) & 0x07) - 1;
      int idx = (note % 12) + 2;
      int freq;

      if (chan->midi_pitchbend) {
            int pitchbend = chan->midi_pitchbend;
            int segment;

            if (pitchbend > 0x1FFF)
                  pitchbend = 0x1FFF;

            segment = pitchbend / 0x1000;
            freq = opl3_note_table[idx+segment];
            freq += ((opl3_note_table[idx+segment+1] - freq) *
                   (pitchbend % 0x1000)) / 0x1000;
      } else {
            freq = opl3_note_table[idx];
      }

      *fnum = (unsigned char) freq;
      *blocknum = ((freq >> 8) & OPL3_FNUM_HIGH_MASK) |
            ((block << 2) & OPL3_BLOCKNUM_MASK);
}


#ifdef DEBUG_ALLOC
static void debug_alloc(struct snd_opl3 *opl3, char *s, int voice) {
      int i;
      char *str = "x.24";

      printk("time %.5i: %s [%.2i]: ", opl3->use_time, s, voice);
      for (i = 0; i < opl3->max_voices; i++)
            printk("%c", *(str + opl3->voices[i].state + 1));
      printk("\n");
}
#endif

/*
 * Get a FM voice (channel) to play a note on.
 */
static int opl3_get_voice(struct snd_opl3 *opl3, int instr_4op,
                    struct snd_midi_channel *chan) {
      int chan_4op_1;         /* first voice for 4op instrument */
      int chan_4op_2;         /* second voice for 4op instrument */

      struct snd_opl3_voice *vp, *vp2;
      unsigned int voice_time;
      int i;

#ifdef DEBUG_ALLOC
      char *alloc_type[3] = { "FREE     ", "CHEAP    ", "EXPENSIVE" };
#endif

      /* This is our "allocation cost" table */
      enum {
            FREE = 0, CHEAP, EXPENSIVE, END
      };

      /* Keeps track of what we are finding */
      struct best {
            unsigned int time;
            int voice;
      } best[END];
      struct best *bp;

      for (i = 0; i < END; i++) {
            best[i].time = (unsigned int)(-1); /* XXX MAX_?INT really */;
            best[i].voice = -1;
      }

      /* Look through all the channels for the most suitable. */
      for (i = 0; i < opl3->max_voices; i++) {
            vp = &opl3->voices[i];

            if (vp->state == SNDRV_OPL3_ST_NOT_AVAIL)
              /* skip unavailable channels, allocated by
                 drum voices or by bounded 4op voices) */
                  continue;

            voice_time = vp->time;
            bp = best;

            chan_4op_1 = ((i < 3) || (i > 8 && i < 12));
            chan_4op_2 = ((i > 2 && i < 6) || (i > 11 && i < 15));
            if (instr_4op) {
                  /* allocate 4op voice */
                  /* skip channels unavailable to 4op instrument */
                  if (!chan_4op_1)
                        continue;

                  if (vp->state)
                        /* kill one voice, CHEAP */
                        bp++;
                  /* get state of bounded 2op channel
                     to be allocated for 4op instrument */
                  vp2 = &opl3->voices[i + 3];
                  if (vp2->state == SNDRV_OPL3_ST_ON_2OP) {
                        /* kill two voices, EXPENSIVE */
                        bp++;
                        voice_time = (voice_time > vp->time) ?
                              voice_time : vp->time;
                  }
            } else {
                  /* allocate 2op voice */
                  if ((chan_4op_1) || (chan_4op_2))
                        /* use bounded channels for 2op, CHEAP */
                        bp++;
                  else if (vp->state)
                        /* kill one voice on 2op channel, CHEAP */
                        bp++;
                  /* raise kill cost to EXPENSIVE for all channels */
                  if (vp->state)
                        bp++;
            }
            if (voice_time < bp->time) {
                  bp->time = voice_time;
                  bp->voice = i;
            }
      }

      for (i = 0; i < END; i++) {
            if (best[i].voice >= 0) {
#ifdef DEBUG_ALLOC
                  printk("%s %iop allocation on voice %i\n",
                         alloc_type[i], instr_4op ? 4 : 2,
                         best[i].voice);
#endif
                  return best[i].voice;
            }
      }
      /* not found */
      return -1;
}

/* ------------------------------ */

/*
 * System timer interrupt function
 */
void snd_opl3_timer_func(unsigned long data)
{

      struct snd_opl3 *opl3 = (struct snd_opl3 *)data;
      unsigned long flags;
      int again = 0;
      int i;

      spin_lock_irqsave(&opl3->sys_timer_lock, flags);
      for (i = 0; i < opl3->max_voices; i++) {
            struct snd_opl3_voice *vp = &opl3->voices[i];
            if (vp->state > 0 && vp->note_off_check) {
                  if (vp->note_off == jiffies)
                        snd_opl3_note_off(opl3, vp->note, 0, vp->chan);
                  else
                        again++;
            }
      }
      if (again) {
            opl3->tlist.expires = jiffies + 1;  /* invoke again */
            add_timer(&opl3->tlist);
      } else {
            opl3->sys_timer_status = 0;
      }
      spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}

/*
 * Start system timer
 */
static void snd_opl3_start_timer(struct snd_opl3 *opl3)
{
      unsigned long flags;
      spin_lock_irqsave(&opl3->sys_timer_lock, flags);
      if (! opl3->sys_timer_status) {
            opl3->tlist.expires = jiffies + 1;
            add_timer(&opl3->tlist);
            opl3->sys_timer_status = 1;
      }
      spin_unlock_irqrestore(&opl3->sys_timer_lock, flags);
}

/* ------------------------------ */


static int snd_opl3_oss_map[MAX_OPL3_VOICES] = {
      0, 1, 2, 9, 10, 11, 6, 7, 8, 15, 16, 17, 3, 4 ,5, 12, 13, 14
};

/*
 * Start a note.
 */
void snd_opl3_note_on(void *p, int note, int vel, struct snd_midi_channel *chan)
{
      struct snd_opl3 *opl3;
      struct snd_seq_instr wanted;
      struct snd_seq_kinstr *kinstr;
      int instr_4op;

      int voice;
      struct snd_opl3_voice *vp, *vp2;
      unsigned short connect_mask;
      unsigned char connection;
      unsigned char vol_op[4];

      int extra_prg = 0;

      unsigned short reg_side;
      unsigned char op_offset;
      unsigned char voice_offset;
      unsigned short opl3_reg;
      unsigned char reg_val;

      int key = note;
      unsigned char fnum, blocknum;
      int i;

      struct fm_instrument *fm;
      unsigned long flags;

      opl3 = p;

#ifdef DEBUG_MIDI
      snd_printk("Note on, ch %i, inst %i, note %i, vel %i\n",
               chan->number, chan->midi_program, note, vel);
#endif
      wanted.cluster = 0;
      wanted.std = SNDRV_SEQ_INSTR_TYPE2_OPL2_3;

      /* in SYNTH mode, application takes care of voices */
      /* in SEQ mode, drum voice numbers are notes on drum channel */
      if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
            if (chan->drum_channel) {
                  /* percussion instruments are located in bank 128 */
                  wanted.bank = 128;
                  wanted.prg = note;
            } else {
                  wanted.bank = chan->gm_bank_select;
                  wanted.prg = chan->midi_program;
            }
      } else {
            /* Prepare for OSS mode */
            if (chan->number >= MAX_OPL3_VOICES)
                  return;

            /* OSS instruments are located in bank 127 */
            wanted.bank = 127;
            wanted.prg = chan->midi_program;
      }

      spin_lock_irqsave(&opl3->voice_lock, flags);

      if (use_internal_drums) {
            snd_opl3_drum_switch(opl3, note, vel, 1, chan);
            spin_unlock_irqrestore(&opl3->voice_lock, flags);
            return;
      }

 __extra_prg:
      kinstr = snd_seq_instr_find(opl3->ilist, &wanted, 1, 0);
      if (kinstr == NULL) {
            spin_unlock_irqrestore(&opl3->voice_lock, flags);
            return;
      }

      fm = KINSTR_DATA(kinstr);

      switch (fm->type) {
      case FM_PATCH_OPL2:
            instr_4op = 0;
            break;
      case FM_PATCH_OPL3:
            if (opl3->hardware >= OPL3_HW_OPL3) {
                  instr_4op = 1;
                  break;
            }
      default:
            snd_seq_instr_free_use(opl3->ilist, kinstr);
            spin_unlock_irqrestore(&opl3->voice_lock, flags);
            return;
      }

#ifdef DEBUG_MIDI
      snd_printk("  --> OPL%i instrument: %s\n",
               instr_4op ? 3 : 2, kinstr->name);
#endif
      /* in SYNTH mode, application takes care of voices */
      /* in SEQ mode, allocate voice on free OPL3 channel */
      if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
            voice = opl3_get_voice(opl3, instr_4op, chan);
      } else {
            /* remap OSS voice */
            voice = snd_opl3_oss_map[chan->number];         
      }

      if (voice < MAX_OPL2_VOICES) {
            /* Left register block for voices 0 .. 8 */
            reg_side = OPL3_LEFT;
            voice_offset = voice;
            connect_mask = (OPL3_LEFT_4OP_0 << voice_offset) & 0x07;
      } else {
            /* Right register block for voices 9 .. 17 */
            reg_side = OPL3_RIGHT;
            voice_offset = voice - MAX_OPL2_VOICES;
            connect_mask = (OPL3_RIGHT_4OP_0 << voice_offset) & 0x38;
      }

      /* kill voice on channel */
      vp = &opl3->voices[voice];
      if (vp->state > 0) {
            opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
            reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
            opl3->command(opl3, opl3_reg, reg_val);
      }
      if (instr_4op) {
            vp2 = &opl3->voices[voice + 3];
            if (vp->state > 0) {
                  opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK +
                                     voice_offset + 3);
                  reg_val = vp->keyon_reg & ~OPL3_KEYON_BIT;
                  opl3->command(opl3, opl3_reg, reg_val);
            }
      }

      /* set connection register */
      if (instr_4op) {
            if ((opl3->connection_reg ^ connect_mask) & connect_mask) {
                  opl3->connection_reg |= connect_mask;
                  /* set connection bit */
                  opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
                  opl3->command(opl3, opl3_reg, opl3->connection_reg);
            }
      } else {
            if ((opl3->connection_reg ^ ~connect_mask) & connect_mask) {
                  opl3->connection_reg &= ~connect_mask;
                  /* clear connection bit */
                  opl3_reg = OPL3_RIGHT | OPL3_REG_CONNECTION_SELECT;
                  opl3->command(opl3, opl3_reg, opl3->connection_reg);
            }
      }

#ifdef DEBUG_MIDI
      snd_printk("  --> setting OPL3 connection: 0x%x\n",
               opl3->connection_reg);
#endif
      /*
       * calculate volume depending on connection
       * between FM operators (see include/opl3.h)
       */
      for (i = 0; i < (instr_4op ? 4 : 2); i++)
            vol_op[i] = fm->op[i].ksl_level;

      connection = fm->feedback_connection[0] & 0x01;
      if (instr_4op) {
            connection <<= 1;
            connection |= fm->feedback_connection[1] & 0x01;

            snd_opl3_calc_volume(&vol_op[3], vel, chan);
            switch (connection) {
            case 0x03:
                  snd_opl3_calc_volume(&vol_op[2], vel, chan);
                  /* fallthru */
            case 0x02:
                  snd_opl3_calc_volume(&vol_op[0], vel, chan);
                  break;
            case 0x01:
                  snd_opl3_calc_volume(&vol_op[1], vel, chan);
            }
      } else {
            snd_opl3_calc_volume(&vol_op[1], vel, chan);
            if (connection)
                  snd_opl3_calc_volume(&vol_op[0], vel, chan);
      }

      /* Program the FM voice characteristics */
      for (i = 0; i < (instr_4op ? 4 : 2); i++) {
#ifdef DEBUG_MIDI
            snd_printk("  --> programming operator %i\n", i);
#endif
            op_offset = snd_opl3_regmap[voice_offset][i];

            /* Set OPL3 AM_VIB register of requested voice/operator */ 
            reg_val = fm->op[i].am_vib;
            opl3_reg = reg_side | (OPL3_REG_AM_VIB + op_offset);
            opl3->command(opl3, opl3_reg, reg_val);

            /* Set OPL3 KSL_LEVEL register of requested voice/operator */ 
            reg_val = vol_op[i];
            opl3_reg = reg_side | (OPL3_REG_KSL_LEVEL + op_offset);
            opl3->command(opl3, opl3_reg, reg_val);

            /* Set OPL3 ATTACK_DECAY register of requested voice/operator */ 
            reg_val = fm->op[i].attack_decay;
            opl3_reg = reg_side | (OPL3_REG_ATTACK_DECAY + op_offset);
            opl3->command(opl3, opl3_reg, reg_val);

            /* Set OPL3 SUSTAIN_RELEASE register of requested voice/operator */ 
            reg_val = fm->op[i].sustain_release;
            opl3_reg = reg_side | (OPL3_REG_SUSTAIN_RELEASE + op_offset);
            opl3->command(opl3, opl3_reg, reg_val);

            /* Select waveform */
            reg_val = fm->op[i].wave_select;
            opl3_reg = reg_side | (OPL3_REG_WAVE_SELECT + op_offset);
            opl3->command(opl3, opl3_reg, reg_val);
      }

      /* Set operator feedback and 2op inter-operator connection */
      reg_val = fm->feedback_connection[0];
      /* Set output voice connection */
      reg_val |= OPL3_STEREO_BITS;
      if (chan->gm_pan < 43)
            reg_val &= ~OPL3_VOICE_TO_RIGHT;
      if (chan->gm_pan > 85)
            reg_val &= ~OPL3_VOICE_TO_LEFT;
      opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION + voice_offset);
      opl3->command(opl3, opl3_reg, reg_val);

      if (instr_4op) {
            /* Set 4op inter-operator connection */
            reg_val = fm->feedback_connection[1] & OPL3_CONNECTION_BIT;
            /* Set output voice connection */
            reg_val |= OPL3_STEREO_BITS;
            if (chan->gm_pan < 43)
                  reg_val &= ~OPL3_VOICE_TO_RIGHT;
            if (chan->gm_pan > 85)
                  reg_val &= ~OPL3_VOICE_TO_LEFT;
            opl3_reg = reg_side | (OPL3_REG_FEEDBACK_CONNECTION +
                               voice_offset + 3);
            opl3->command(opl3, opl3_reg, reg_val);
      }

      /*
       * Special treatment of percussion notes for fm:
       * Requested pitch is really program, and pitch for
       * device is whatever was specified in the patch library.
       */
      if (fm->fix_key)
            note = fm->fix_key;
      /*
       * use transpose if defined in patch library
       */
      if (fm->trnsps)
            note += (fm->trnsps - 64);

      snd_opl3_calc_pitch(&fnum, &blocknum, note, chan);

      /* Set OPL3 FNUM_LOW register of requested voice */
      opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
      opl3->command(opl3, opl3_reg, fnum);

      opl3->voices[voice].keyon_reg = blocknum;

      /* Set output sound flag */
      blocknum |= OPL3_KEYON_BIT;

#ifdef DEBUG_MIDI
      snd_printk("  --> trigger voice %i\n", voice);
#endif
      /* Set OPL3 KEYON_BLOCK register of requested voice */ 
      opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
      opl3->command(opl3, opl3_reg, blocknum);

      /* kill note after fixed duration (in centiseconds) */
      if (fm->fix_dur) {
            opl3->voices[voice].note_off = jiffies +
                  (fm->fix_dur * HZ) / 100;
            snd_opl3_start_timer(opl3);
            opl3->voices[voice].note_off_check = 1;
      } else
            opl3->voices[voice].note_off_check = 0;

      /* get extra pgm, but avoid possible loops */
      extra_prg = (extra_prg) ? 0 : fm->modes;

      snd_seq_instr_free_use(opl3->ilist, kinstr);

      /* do the bookkeeping */
      vp->time = opl3->use_time++;
      vp->note = key;
      vp->chan = chan;

      if (instr_4op) {
            vp->state = SNDRV_OPL3_ST_ON_4OP;

            vp2 = &opl3->voices[voice + 3];
            vp2->time = opl3->use_time++;
            vp2->note = key;
            vp2->chan = chan;
            vp2->state = SNDRV_OPL3_ST_NOT_AVAIL;
      } else {
            if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
                  /* 4op killed by 2op, release bounded voice */
                  vp2 = &opl3->voices[voice + 3];
                  vp2->time = opl3->use_time++;
                  vp2->state = SNDRV_OPL3_ST_OFF;
            }
            vp->state = SNDRV_OPL3_ST_ON_2OP;
      }

#ifdef DEBUG_ALLOC
      debug_alloc(opl3, "note on ", voice);
#endif

      /* allocate extra program if specified in patch library */
      if (extra_prg) {
            if (extra_prg > 128) {
                  wanted.bank = 128;
                  /* percussions start at 35 */
                  wanted.prg = extra_prg - 128 + 35 - 1;
            } else {
                  wanted.bank = 0;
                  wanted.prg = extra_prg - 1;
            }
#ifdef DEBUG_MIDI
            snd_printk(" *** allocating extra program\n");
#endif
            goto __extra_prg;
      }
      spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

static void snd_opl3_kill_voice(struct snd_opl3 *opl3, int voice)
{
      unsigned short reg_side;
      unsigned char voice_offset;
      unsigned short opl3_reg;

      struct snd_opl3_voice *vp, *vp2;

      snd_assert(voice < MAX_OPL3_VOICES, return);

      vp = &opl3->voices[voice];
      if (voice < MAX_OPL2_VOICES) {
            /* Left register block for voices 0 .. 8 */
            reg_side = OPL3_LEFT;
            voice_offset = voice;
      } else {
            /* Right register block for voices 9 .. 17 */
            reg_side = OPL3_RIGHT;
            voice_offset = voice - MAX_OPL2_VOICES;
      }

      /* kill voice */
#ifdef DEBUG_MIDI
      snd_printk("  --> kill voice %i\n", voice);
#endif
      opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
      /* clear Key ON bit */
      opl3->command(opl3, opl3_reg, vp->keyon_reg);

      /* do the bookkeeping */
      vp->time = opl3->use_time++;

      if (vp->state == SNDRV_OPL3_ST_ON_4OP) {
            vp2 = &opl3->voices[voice + 3];

            vp2->time = opl3->use_time++;
            vp2->state = SNDRV_OPL3_ST_OFF;
      }
      vp->state = SNDRV_OPL3_ST_OFF;
#ifdef DEBUG_ALLOC
      debug_alloc(opl3, "note off", voice);
#endif

}

/*
 * Release a note in response to a midi note off.
 */
void snd_opl3_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
{
      struct snd_opl3 *opl3;

      int voice;
      struct snd_opl3_voice *vp;

      unsigned long flags;

      opl3 = p;

#ifdef DEBUG_MIDI
      snd_printk("Note off, ch %i, inst %i, note %i\n",
               chan->number, chan->midi_program, note);
#endif

      spin_lock_irqsave(&opl3->voice_lock, flags);

      if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
            if (chan->drum_channel && use_internal_drums) {
                  snd_opl3_drum_switch(opl3, note, vel, 0, chan);
                  spin_unlock_irqrestore(&opl3->voice_lock, flags);
                  return;
            }
            /* this loop will hopefully kill all extra voices, because
               they are grouped by the same channel and note values */
            for (voice = 0; voice < opl3->max_voices; voice++) {
                  vp = &opl3->voices[voice];
                  if (vp->state > 0 && vp->chan == chan && vp->note == note) {
                        snd_opl3_kill_voice(opl3, voice);
                  }
            }
      } else {
            /* remap OSS voices */
            if (chan->number < MAX_OPL3_VOICES) {
                  voice = snd_opl3_oss_map[chan->number];         
                  snd_opl3_kill_voice(opl3, voice);
            }
      }
      spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

/*
 * key pressure change
 */
void snd_opl3_key_press(void *p, int note, int vel, struct snd_midi_channel *chan)
{
      struct snd_opl3 *opl3;

      opl3 = p;
#ifdef DEBUG_MIDI
      snd_printk("Key pressure, ch#: %i, inst#: %i\n",
               chan->number, chan->midi_program);
#endif
}

/*
 * terminate note
 */
void snd_opl3_terminate_note(void *p, int note, struct snd_midi_channel *chan)
{
      struct snd_opl3 *opl3;

      opl3 = p;
#ifdef DEBUG_MIDI
      snd_printk("Terminate note, ch#: %i, inst#: %i\n",
               chan->number, chan->midi_program);
#endif
}

static void snd_opl3_update_pitch(struct snd_opl3 *opl3, int voice)
{
      unsigned short reg_side;
      unsigned char voice_offset;
      unsigned short opl3_reg;

      unsigned char fnum, blocknum;

      struct snd_opl3_voice *vp;

      snd_assert(voice < MAX_OPL3_VOICES, return);

      vp = &opl3->voices[voice];
      if (vp->chan == NULL)
            return; /* not allocated? */

      if (voice < MAX_OPL2_VOICES) {
            /* Left register block for voices 0 .. 8 */
            reg_side = OPL3_LEFT;
            voice_offset = voice;
      } else {
            /* Right register block for voices 9 .. 17 */
            reg_side = OPL3_RIGHT;
            voice_offset = voice - MAX_OPL2_VOICES;
      }

      snd_opl3_calc_pitch(&fnum, &blocknum, vp->note, vp->chan);

      /* Set OPL3 FNUM_LOW register of requested voice */
      opl3_reg = reg_side | (OPL3_REG_FNUM_LOW + voice_offset);
      opl3->command(opl3, opl3_reg, fnum);

      vp->keyon_reg = blocknum;

      /* Set output sound flag */
      blocknum |= OPL3_KEYON_BIT;

      /* Set OPL3 KEYON_BLOCK register of requested voice */ 
      opl3_reg = reg_side | (OPL3_REG_KEYON_BLOCK + voice_offset);
      opl3->command(opl3, opl3_reg, blocknum);

      vp->time = opl3->use_time++;
}

/*
 * Update voice pitch controller
 */
static void snd_opl3_pitch_ctrl(struct snd_opl3 *opl3, struct snd_midi_channel *chan)
{
      int voice;
      struct snd_opl3_voice *vp;

      unsigned long flags;

      spin_lock_irqsave(&opl3->voice_lock, flags);

      if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
            for (voice = 0; voice < opl3->max_voices; voice++) {
                  vp = &opl3->voices[voice];
                  if (vp->state > 0 && vp->chan == chan) {
                        snd_opl3_update_pitch(opl3, voice);
                  }
            }
      } else {
            /* remap OSS voices */
            if (chan->number < MAX_OPL3_VOICES) {
                  voice = snd_opl3_oss_map[chan->number];         
                  snd_opl3_update_pitch(opl3, voice);
            }
      }
      spin_unlock_irqrestore(&opl3->voice_lock, flags);
}

/*
 * Deal with a controler type event.  This includes all types of
 * control events, not just the midi controllers
 */
void snd_opl3_control(void *p, int type, struct snd_midi_channel *chan)
{
      struct snd_opl3 *opl3;

      opl3 = p;
#ifdef DEBUG_MIDI
      snd_printk("Controller, TYPE = %i, ch#: %i, inst#: %i\n",
               type, chan->number, chan->midi_program);
#endif

      switch (type) {
      case MIDI_CTL_MSB_MODWHEEL:
            if (chan->control[MIDI_CTL_MSB_MODWHEEL] > 63)
                  opl3->drum_reg |= OPL3_VIBRATO_DEPTH;
            else 
                  opl3->drum_reg &= ~OPL3_VIBRATO_DEPTH;
            opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
                         opl3->drum_reg);
            break;
      case MIDI_CTL_E2_TREMOLO_DEPTH:
            if (chan->control[MIDI_CTL_E2_TREMOLO_DEPTH] > 63)
                  opl3->drum_reg |= OPL3_TREMOLO_DEPTH;
            else 
                  opl3->drum_reg &= ~OPL3_TREMOLO_DEPTH;
            opl3->command(opl3, OPL3_LEFT | OPL3_REG_PERCUSSION,
                         opl3->drum_reg);
            break;
      case MIDI_CTL_PITCHBEND:
            snd_opl3_pitch_ctrl(opl3, chan);
            break;
      }
}

/*
 * NRPN events
 */
void snd_opl3_nrpn(void *p, struct snd_midi_channel *chan,
               struct snd_midi_channel_set *chset)
{
      struct snd_opl3 *opl3;

      opl3 = p;
#ifdef DEBUG_MIDI
      snd_printk("NRPN, ch#: %i, inst#: %i\n",
               chan->number, chan->midi_program);
#endif
}

/*
 * receive sysex
 */
void snd_opl3_sysex(void *p, unsigned char *buf, int len,
                int parsed, struct snd_midi_channel_set *chset)
{
      struct snd_opl3 *opl3;

      opl3 = p;
#ifdef DEBUG_MIDI
      snd_printk("SYSEX\n");
#endif
}

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