--- /dev/null
+/*
+ * 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 bool use_internal_drums;
+
+static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
+ struct snd_midi_channel *chan);
+/*
+ * 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 < -0x2000)
+ pitchbend = -0x2000;
+ 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(KERN_DEBUG "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(KERN_DEBUG "%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->voice_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_unsafe(opl3, vp->note, 0,
+ vp->chan);
+ else
+ again++;
+ }
+ }
+ spin_unlock_irqrestore(&opl3->voice_lock, flags);
+
+ spin_lock_irqsave(&opl3->sys_timer_lock, flags);
+ if (again)
+ mod_timer(&opl3->tlist, jiffies + 1); /* invoke again */
+ 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) {
+ mod_timer(&opl3->tlist, jiffies + 1);
+ 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;
+ 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;
+ unsigned char prg, bank;
+
+ int key = note;
+ unsigned char fnum, blocknum;
+ int i;
+
+ struct fm_patch *patch;
+ struct fm_instrument *fm;
+ unsigned long flags;
+
+ opl3 = p;
+
+#ifdef DEBUG_MIDI
+ snd_printk(KERN_DEBUG "Note on, ch %i, inst %i, note %i, vel %i\n",
+ chan->number, chan->midi_program, note, vel);
+#endif
+
+ /* 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 */
+ bank = 128;
+ prg = note;
+ } else {
+ bank = chan->gm_bank_select;
+ prg = chan->midi_program;
+ }
+ } else {
+ /* Prepare for OSS mode */
+ if (chan->number >= MAX_OPL3_VOICES)
+ return;
+
+ /* OSS instruments are located in bank 127 */
+ bank = 127;
+ 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:
+ patch = snd_opl3_find_patch(opl3, prg, bank, 0);
+ if (!patch) {
+ spin_unlock_irqrestore(&opl3->voice_lock, flags);
+ return;
+ }
+
+ fm = &patch->inst;
+ switch (patch->type) {
+ case FM_PATCH_OPL2:
+ instr_4op = 0;
+ break;
+ case FM_PATCH_OPL3:
+ if (opl3->hardware >= OPL3_HW_OPL3) {
+ instr_4op = 1;
+ break;
+ }
+ default:
+ spin_unlock_irqrestore(&opl3->voice_lock, flags);
+ return;
+ }
+#ifdef DEBUG_MIDI
+ snd_printk(KERN_DEBUG " --> OPL%i instrument: %s\n",
+ instr_4op ? 3 : 2, patch->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 < 0) {
+ spin_unlock_irqrestore(&opl3->voice_lock, flags);
+ return;
+ }
+
+ 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(KERN_DEBUG " --> 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(KERN_DEBUG " --> 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(KERN_DEBUG " --> 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;
+
+ /* 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) {
+ bank = 128;
+ /* percussions start at 35 */
+ prg = extra_prg - 128 + 35 - 1;
+ } else {
+ bank = 0;
+ prg = extra_prg - 1;
+ }
+#ifdef DEBUG_MIDI
+ snd_printk(KERN_DEBUG " *** 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;
+
+ if (snd_BUG_ON(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(KERN_DEBUG " --> 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.
+ */
+static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
+ struct snd_midi_channel *chan)
+{
+ struct snd_opl3 *opl3;
+
+ int voice;
+ struct snd_opl3_voice *vp;
+
+ opl3 = p;
+
+#ifdef DEBUG_MIDI
+ snd_printk(KERN_DEBUG "Note off, ch %i, inst %i, note %i\n",
+ chan->number, chan->midi_program, note);
+#endif
+
+ if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
+ if (chan->drum_channel && use_internal_drums) {
+ snd_opl3_drum_switch(opl3, note, vel, 0, chan);
+ 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);
+ }
+ }
+}
+
+void snd_opl3_note_off(void *p, int note, int vel,
+ struct snd_midi_channel *chan)
+{
+ struct snd_opl3 *opl3 = p;
+ unsigned long flags;
+
+ spin_lock_irqsave(&opl3->voice_lock, flags);
+ snd_opl3_note_off_unsafe(p, note, vel, chan);
+ 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(KERN_DEBUG "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(KERN_DEBUG "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;
+
+ if (snd_BUG_ON(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 controller 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(KERN_DEBUG "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(KERN_DEBUG "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(KERN_DEBUG "SYSEX\n");
+#endif
+}
Code Review / kvmfornfv.git / blobdiff