sound/core/seq/oss/seq_oss

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This source file includes following definitions.
snd_seq_oss_process_event
old_event
extended_event
chn_voice_event
chn_common_event
timing_event
local_event
note_on_event
note_off_event
set_note_event
set_control_event
set_echo_event
snd_seq_oss_event_input
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * OSS compatible sequencer driver
   4  *
   5  * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
   6  */
   7 
   8 #include "seq_oss_device.h"
   9 #include "seq_oss_synth.h"
  10 #include "seq_oss_midi.h"
  11 #include "seq_oss_event.h"
  12 #include "seq_oss_timer.h"
  13 #include <sound/seq_oss_legacy.h>
  14 #include "seq_oss_readq.h"
  15 #include "seq_oss_writeq.h"
  16 #include <linux/nospec.h>
  17 
  18 
  19 /*
  20  * prototypes
  21  */
  22 static int extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
  23 static int chn_voice_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
  24 static int chn_common_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
  25 static int timing_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
  26 static int local_event(struct seq_oss_devinfo *dp, union evrec *event_rec, struct snd_seq_event *ev);
  27 static int old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev);
  28 static int note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
  29 static int note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev);
  30 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);
  31 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);
  32 static int set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev);
  33 
  34 
  35 /*
  36  * convert an OSS event to ALSA event
  37  * return 0 : enqueued
  38  *        non-zero : invalid - ignored
  39  */
  40 
  41 int
  42 snd_seq_oss_process_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
  43 {
  44         switch (q->s.code) {
  45         case SEQ_EXTENDED:
  46                 return extended_event(dp, q, ev);
  47 
  48         case EV_CHN_VOICE:
  49                 return chn_voice_event(dp, q, ev);
  50 
  51         case EV_CHN_COMMON:
  52                 return chn_common_event(dp, q, ev);
  53 
  54         case EV_TIMING:
  55                 return timing_event(dp, q, ev);
  56 
  57         case EV_SEQ_LOCAL:
  58                 return local_event(dp, q, ev);
  59 
  60         case EV_SYSEX:
  61                 return snd_seq_oss_synth_sysex(dp, q->x.dev, q->x.buf, ev);
  62 
  63         case SEQ_MIDIPUTC:
  64                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
  65                         return -EINVAL;
  66                 /* put a midi byte */
  67                 if (! is_write_mode(dp->file_mode))
  68                         break;
  69                 if (snd_seq_oss_midi_open(dp, q->s.dev, SNDRV_SEQ_OSS_FILE_WRITE))
  70                         break;
  71                 if (snd_seq_oss_midi_filemode(dp, q->s.dev) & SNDRV_SEQ_OSS_FILE_WRITE)
  72                         return snd_seq_oss_midi_putc(dp, q->s.dev, q->s.parm1, ev);
  73                 break;
  74 
  75         case SEQ_ECHO:
  76                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
  77                         return -EINVAL;
  78                 return set_echo_event(dp, q, ev);
  79 
  80         case SEQ_PRIVATE:
  81                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
  82                         return -EINVAL;
  83                 return snd_seq_oss_synth_raw_event(dp, q->c[1], q->c, ev);
  84 
  85         default:
  86                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
  87                         return -EINVAL;
  88                 return old_event(dp, q, ev);
  89         }
  90         return -EINVAL;
  91 }
  92 
  93 /* old type events: mode1 only */
  94 static int
  95 old_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
  96 {
  97         switch (q->s.code) {
  98         case SEQ_NOTEOFF:
  99                 return note_off_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
 100 
 101         case SEQ_NOTEON:
 102                 return note_on_event(dp, 0, q->n.chn, q->n.note, q->n.vel, ev);
 103 
 104         case SEQ_WAIT:
 105                 /* skip */
 106                 break;
 107 
 108         case SEQ_PGMCHANGE:
 109                 return set_control_event(dp, 0, SNDRV_SEQ_EVENT_PGMCHANGE,
 110                                          q->n.chn, 0, q->n.note, ev);
 111 
 112         case SEQ_SYNCTIMER:
 113                 return snd_seq_oss_timer_reset(dp->timer);
 114         }
 115 
 116         return -EINVAL;
 117 }
 118 
 119 /* 8bytes extended event: mode1 only */
 120 static int
 121 extended_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
 122 {
 123         int val;
 124 
 125         switch (q->e.cmd) {
 126         case SEQ_NOTEOFF:
 127                 return note_off_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
 128 
 129         case SEQ_NOTEON:
 130                 return note_on_event(dp, q->e.dev, q->e.chn, q->e.p1, q->e.p2, ev);
 131 
 132         case SEQ_PGMCHANGE:
 133                 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
 134                                          q->e.chn, 0, q->e.p1, ev);
 135 
 136         case SEQ_AFTERTOUCH:
 137                 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CHANPRESS,
 138                                          q->e.chn, 0, q->e.p1, ev);
 139 
 140         case SEQ_BALANCE:
 141                 /* convert -128:127 to 0:127 */
 142                 val = (char)q->e.p1;
 143                 val = (val + 128) / 2;
 144                 return set_control_event(dp, q->e.dev, SNDRV_SEQ_EVENT_CONTROLLER,
 145                                          q->e.chn, CTL_PAN, val, ev);
 146 
 147         case SEQ_CONTROLLER:
 148                 val = ((short)q->e.p3 << 8) | (short)q->e.p2;
 149                 switch (q->e.p1) {
 150                 case CTRL_PITCH_BENDER: /* SEQ1 V2 control */
 151                         /* -0x2000:0x1fff */
 152                         return set_control_event(dp, q->e.dev,
 153                                                  SNDRV_SEQ_EVENT_PITCHBEND,
 154                                                  q->e.chn, 0, val, ev);
 155                 case CTRL_PITCH_BENDER_RANGE:
 156                         /* conversion: 100/semitone -> 128/semitone */
 157                         return set_control_event(dp, q->e.dev,
 158                                                  SNDRV_SEQ_EVENT_REGPARAM,
 159                                                  q->e.chn, 0, val*128/100, ev);
 160                 default:
 161                         return set_control_event(dp, q->e.dev,
 162                                                   SNDRV_SEQ_EVENT_CONTROL14,
 163                                                   q->e.chn, q->e.p1, val, ev);
 164                 }
 165 
 166         case SEQ_VOLMODE:
 167                 return snd_seq_oss_synth_raw_event(dp, q->e.dev, q->c, ev);
 168 
 169         }
 170         return -EINVAL;
 171 }
 172 
 173 /* channel voice events: mode1 and 2 */
 174 static int
 175 chn_voice_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
 176 {
 177         if (q->v.chn >= 32)
 178                 return -EINVAL;
 179         switch (q->v.cmd) {
 180         case MIDI_NOTEON:
 181                 return note_on_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
 182 
 183         case MIDI_NOTEOFF:
 184                 return note_off_event(dp, q->v.dev, q->v.chn, q->v.note, q->v.parm, ev);
 185 
 186         case MIDI_KEY_PRESSURE:
 187                 return set_note_event(dp, q->v.dev, SNDRV_SEQ_EVENT_KEYPRESS,
 188                                        q->v.chn, q->v.note, q->v.parm, ev);
 189 
 190         }
 191         return -EINVAL;
 192 }
 193 
 194 /* channel common events: mode1 and 2 */
 195 static int
 196 chn_common_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
 197 {
 198         if (q->l.chn >= 32)
 199                 return -EINVAL;
 200         switch (q->l.cmd) {
 201         case MIDI_PGM_CHANGE:
 202                 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PGMCHANGE,
 203                                           q->l.chn, 0, q->l.p1, ev);
 204 
 205         case MIDI_CTL_CHANGE:
 206                 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CONTROLLER,
 207                                           q->l.chn, q->l.p1, q->l.val, ev);
 208 
 209         case MIDI_PITCH_BEND:
 210                 /* conversion: 0:0x3fff -> -0x2000:0x1fff */
 211                 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_PITCHBEND,
 212                                           q->l.chn, 0, q->l.val - 8192, ev);
 213                 
 214         case MIDI_CHN_PRESSURE:
 215                 return set_control_event(dp, q->l.dev, SNDRV_SEQ_EVENT_CHANPRESS,
 216                                           q->l.chn, 0, q->l.val, ev);
 217         }
 218         return -EINVAL;
 219 }
 220 
 221 /* timer events: mode1 and mode2 */
 222 static int
 223 timing_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
 224 {
 225         switch (q->t.cmd) {
 226         case TMR_ECHO:
 227                 if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
 228                         return set_echo_event(dp, q, ev);
 229                 else {
 230                         union evrec tmp;
 231                         memset(&tmp, 0, sizeof(tmp));
 232                         /* XXX: only for little-endian! */
 233                         tmp.echo = (q->t.time << 8) | SEQ_ECHO;
 234                         return set_echo_event(dp, &tmp, ev);
 235                 } 
 236 
 237         case TMR_STOP:
 238                 if (dp->seq_mode)
 239                         return snd_seq_oss_timer_stop(dp->timer);
 240                 return 0;
 241 
 242         case TMR_CONTINUE:
 243                 if (dp->seq_mode)
 244                         return snd_seq_oss_timer_continue(dp->timer);
 245                 return 0;
 246 
 247         case TMR_TEMPO:
 248                 if (dp->seq_mode)
 249                         return snd_seq_oss_timer_tempo(dp->timer, q->t.time);
 250                 return 0;
 251         }
 252 
 253         return -EINVAL;
 254 }
 255 
 256 /* local events: mode1 and 2 */
 257 static int
 258 local_event(struct seq_oss_devinfo *dp, union evrec *q, struct snd_seq_event *ev)
 259 {
 260         return -EINVAL;
 261 }
 262 
 263 /*
 264  * process note-on event for OSS synth
 265  * three different modes are available:
 266  * - SNDRV_SEQ_OSS_PROCESS_EVENTS  (for one-voice per channel mode)
 267  *      Accept note 255 as volume change.
 268  * - SNDRV_SEQ_OSS_PASS_EVENTS
 269  *      Pass all events to lowlevel driver anyway
 270  * - SNDRV_SEQ_OSS_PROCESS_KEYPRESS  (mostly for Emu8000)
 271  *      Use key-pressure if note >= 128
 272  */
 273 static int
 274 note_on_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
 275 {
 276         struct seq_oss_synthinfo *info;
 277 
 278         info = snd_seq_oss_synth_info(dp, dev);
 279         if (!info)
 280                 return -ENXIO;
 281 
 282         switch (info->arg.event_passing) {
 283         case SNDRV_SEQ_OSS_PROCESS_EVENTS:
 284                 if (! info->ch || ch < 0 || ch >= info->nr_voices) {
 285                         /* pass directly */
 286                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
 287                 }
 288 
 289                 ch = array_index_nospec(ch, info->nr_voices);
 290                 if (note == 255 && info->ch[ch].note >= 0) {
 291                         /* volume control */
 292                         int type;
 293                         //if (! vel)
 294                                 /* set volume to zero -- note off */
 295                         //      type = SNDRV_SEQ_EVENT_NOTEOFF;
 296                         //else
 297                                 if (info->ch[ch].vel)
 298                                 /* sample already started -- volume change */
 299                                 type = SNDRV_SEQ_EVENT_KEYPRESS;
 300                         else
 301                                 /* sample not started -- start now */
 302                                 type = SNDRV_SEQ_EVENT_NOTEON;
 303                         info->ch[ch].vel = vel;
 304                         return set_note_event(dp, dev, type, ch, info->ch[ch].note, vel, ev);
 305                 } else if (note >= 128)
 306                         return -EINVAL; /* invalid */
 307 
 308                 if (note != info->ch[ch].note && info->ch[ch].note >= 0)
 309                         /* note changed - note off at beginning */
 310                         set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, info->ch[ch].note, 0, ev);
 311                 /* set current status */
 312                 info->ch[ch].note = note;
 313                 info->ch[ch].vel = vel;
 314                 if (vel) /* non-zero velocity - start the note now */
 315                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
 316                 return -EINVAL;
 317                 
 318         case SNDRV_SEQ_OSS_PASS_EVENTS:
 319                 /* pass the event anyway */
 320                 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
 321 
 322         case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
 323                 if (note >= 128) /* key pressure: shifted by 128 */
 324                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_KEYPRESS, ch, note - 128, vel, ev);
 325                 else /* normal note-on event */
 326                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
 327         }
 328         return -EINVAL;
 329 }
 330 
 331 /*
 332  * process note-off event for OSS synth
 333  */
 334 static int
 335 note_off_event(struct seq_oss_devinfo *dp, int dev, int ch, int note, int vel, struct snd_seq_event *ev)
 336 {
 337         struct seq_oss_synthinfo *info;
 338 
 339         info = snd_seq_oss_synth_info(dp, dev);
 340         if (!info)
 341                 return -ENXIO;
 342 
 343         switch (info->arg.event_passing) {
 344         case SNDRV_SEQ_OSS_PROCESS_EVENTS:
 345                 if (! info->ch || ch < 0 || ch >= info->nr_voices) {
 346                         /* pass directly */
 347                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEON, ch, note, vel, ev);
 348                 }
 349 
 350                 ch = array_index_nospec(ch, info->nr_voices);
 351                 if (info->ch[ch].note >= 0) {
 352                         note = info->ch[ch].note;
 353                         info->ch[ch].vel = 0;
 354                         info->ch[ch].note = -1;
 355                         return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
 356                 }
 357                 return -EINVAL; /* invalid */
 358 
 359         case SNDRV_SEQ_OSS_PASS_EVENTS:
 360         case SNDRV_SEQ_OSS_PROCESS_KEYPRESS:
 361                 /* pass the event anyway */
 362                 return set_note_event(dp, dev, SNDRV_SEQ_EVENT_NOTEOFF, ch, note, vel, ev);
 363 
 364         }
 365         return -EINVAL;
 366 }
 367 
 368 /*
 369  * create a note event
 370  */
 371 static int
 372 set_note_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int note, int vel, struct snd_seq_event *ev)
 373 {
 374         if (!snd_seq_oss_synth_info(dp, dev))
 375                 return -ENXIO;
 376         
 377         ev->type = type;
 378         snd_seq_oss_synth_addr(dp, dev, ev);
 379         ev->data.note.channel = ch;
 380         ev->data.note.note = note;
 381         ev->data.note.velocity = vel;
 382 
 383         return 0;
 384 }
 385 
 386 /*
 387  * create a control event
 388  */
 389 static int
 390 set_control_event(struct seq_oss_devinfo *dp, int dev, int type, int ch, int param, int val, struct snd_seq_event *ev)
 391 {
 392         if (!snd_seq_oss_synth_info(dp, dev))
 393                 return -ENXIO;
 394         
 395         ev->type = type;
 396         snd_seq_oss_synth_addr(dp, dev, ev);
 397         ev->data.control.channel = ch;
 398         ev->data.control.param = param;
 399         ev->data.control.value = val;
 400 
 401         return 0;
 402 }
 403 
 404 /*
 405  * create an echo event
 406  */
 407 static int
 408 set_echo_event(struct seq_oss_devinfo *dp, union evrec *rec, struct snd_seq_event *ev)
 409 {
 410         ev->type = SNDRV_SEQ_EVENT_ECHO;
 411         /* echo back to itself */
 412         snd_seq_oss_fill_addr(dp, ev, dp->addr.client, dp->addr.port);
 413         memcpy(&ev->data, rec, LONG_EVENT_SIZE);
 414         return 0;
 415 }
 416 
 417 /*
 418  * event input callback from ALSA sequencer:
 419  * the echo event is processed here.
 420  */
 421 int
 422 snd_seq_oss_event_input(struct snd_seq_event *ev, int direct, void *private_data,
 423                         int atomic, int hop)
 424 {
 425         struct seq_oss_devinfo *dp = (struct seq_oss_devinfo *)private_data;
 426         union evrec *rec;
 427 
 428         if (ev->type != SNDRV_SEQ_EVENT_ECHO)
 429                 return snd_seq_oss_midi_input(ev, direct, private_data);
 430 
 431         if (ev->source.client != dp->cseq)
 432                 return 0; /* ignored */
 433 
 434         rec = (union evrec*)&ev->data;
 435         if (rec->s.code == SEQ_SYNCTIMER) {
 436                 /* sync echo back */
 437                 snd_seq_oss_writeq_wakeup(dp->writeq, rec->t.time);
 438                 
 439         } else {
 440                 /* echo back event */
 441                 if (dp->readq == NULL)
 442                         return 0;
 443                 snd_seq_oss_readq_put_event(dp->readq, rec);
 444         }
 445         return 0;
 446 }
 447
/* [<][>][^][v][top][bottom][index][help] */
root/sound/core/seq/oss/seq_oss_event.c

DEFINITIONS
