midisyn.c revision 1.17.2.12
1 /* $NetBSD: midisyn.c,v 1.17.2.12 2006/06/07 00:09:39 chap Exp $ */ 2 3 /* 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Lennart Augustsson (augustss (at) NetBSD.org). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: midisyn.c,v 1.17.2.12 2006/06/07 00:09:39 chap Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/ioctl.h> 44 #include <sys/fcntl.h> 45 #include <sys/vnode.h> 46 #include <sys/select.h> 47 #include <sys/proc.h> 48 #include <sys/malloc.h> 49 #include <sys/systm.h> 50 #include <sys/syslog.h> 51 #include <sys/kernel.h> 52 #include <sys/audioio.h> 53 #include <sys/midiio.h> 54 #include <sys/device.h> 55 56 #include <dev/audio_if.h> 57 #include <dev/midi_if.h> 58 #include <dev/midivar.h> 59 #include <dev/midisynvar.h> 60 61 #ifdef AUDIO_DEBUG 62 #define DPRINTF(x) if (midisyndebug) printf x 63 #define DPRINTFN(n,x) if (midisyndebug >= (n)) printf x 64 int midisyndebug = 0; 65 #else 66 #define DPRINTF(x) 67 #define DPRINTFN(n,x) 68 #endif 69 70 int midisyn_findvoice(midisyn *, int, int); 71 void midisyn_freevoice(midisyn *, int); 72 int midisyn_allocvoice(midisyn *, u_int32_t, u_int32_t); 73 u_int32_t midisyn_note_to_freq(int); 74 u_int32_t midisyn_finetune(u_int32_t, int, int, int); 75 76 static midictl_notify midisyn_notify; 77 78 int midisyn_open(void *, int, 79 void (*iintr)(void *, int), 80 void (*ointr)(void *), void *arg); 81 void midisyn_close(void *); 82 int midisyn_sysrt(void *, int); 83 void midisyn_getinfo(void *, struct midi_info *); 84 int midisyn_ioctl(void *, u_long, caddr_t, int, struct lwp *); 85 86 const struct midi_hw_if midisyn_hw_if = { 87 midisyn_open, 88 midisyn_close, 89 midisyn_sysrt, 90 midisyn_getinfo, 91 midisyn_ioctl, 92 }; 93 94 int midisyn_channelmsg(void *, int, int, u_char *, int); 95 int midisyn_commonmsg(void *, int, u_char *, int); 96 int midisyn_sysex(void *, u_char *, int); 97 98 struct midi_hw_if_ext midisyn_hw_if_ext = { 99 .channel = midisyn_channelmsg, 100 .common = midisyn_commonmsg, 101 .sysex = midisyn_sysex, 102 }; 103 104 int 105 midisyn_open(void *addr, int flags, void (*iintr)(void *, int), 106 void (*ointr)(void *), void *arg) 107 { 108 midisyn *ms = addr; 109 110 DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets)); 111 112 midictl_open(&ms->ctl); 113 114 if (ms->mets->open) 115 return (ms->mets->open(ms, flags)); 116 else 117 return (0); 118 } 119 120 void 121 midisyn_close(void *addr) 122 { 123 midisyn *ms = addr; 124 struct midisyn_methods *fs; 125 int v; 126 127 DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets)); 128 fs = ms->mets; 129 for (v = 0; v < ms->nvoice; v++) 130 if (ms->voices[v].inuse) { 131 fs->noteoff(ms, v, 0, 0); 132 midisyn_freevoice(ms, v); 133 } 134 if (fs->close) 135 fs->close(ms); 136 137 midictl_close(&ms->ctl); 138 } 139 140 void 141 midisyn_getinfo(void *addr, struct midi_info *mi) 142 { 143 midisyn *ms = addr; 144 145 mi->name = ms->name; 146 /* 147 * I was going to add a property here to suppress midi(4)'s warning 148 * about an output device that uses no transmit interrupt, on the 149 * assumption that as an onboard synth we handle "output" internally 150 * with nothing like the 320 us per byte busy wait of a dumb UART. 151 * Then I noticed that opl (at least as currently implemented) seems 152 * to need 40 us busy wait to set each register on an OPL2, and sets 153 * about 21 registers for every note-on. (Half of that is patch loading 154 * and could probably be reduced by different management of voices and 155 * patches.) For now I won't bother suppressing that warning.... 156 */ 157 mi->props = 0; 158 159 midi_register_hw_if_ext(&midisyn_hw_if_ext); 160 } 161 162 int 163 midisyn_ioctl(void *maddr, u_long cmd, caddr_t addr, int flag, struct lwp *l) 164 { 165 midisyn *ms = maddr; 166 167 if (ms->mets->ioctl) 168 return (ms->mets->ioctl(ms, cmd, addr, flag, l)); 169 else 170 return (EINVAL); 171 } 172 173 int 174 midisyn_findvoice(midisyn *ms, int chan, int note) 175 { 176 u_int cn; 177 int v; 178 179 if (!(ms->flags & MS_DOALLOC)) 180 return (chan); 181 cn = MS_CHANNOTE(chan, note); 182 for (v = 0; v < ms->nvoice; v++) 183 if (ms->voices[v].chan_note == cn && ms->voices[v].inuse) 184 return (v); 185 return (-1); 186 } 187 188 void 189 midisyn_attach(struct midi_softc *sc, midisyn *ms) 190 { 191 if (ms->flags & MS_DOALLOC) { 192 ms->voices = malloc(ms->nvoice * sizeof (struct voice), 193 M_DEVBUF, M_WAITOK|M_ZERO); 194 ms->seqno = 1; 195 if (ms->mets->allocv == 0) 196 ms->mets->allocv = &midisyn_allocvoice; 197 } 198 199 ms->ctl = (midictl) { 200 .base_channel = 16, 201 .cookie = ms, 202 .notify = midisyn_notify 203 }; 204 205 sc->hw_if = &midisyn_hw_if; 206 sc->hw_hdl = ms; 207 DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl)); 208 } 209 210 void 211 midisyn_freevoice(midisyn *ms, int voice) 212 { 213 if (!(ms->flags & MS_DOALLOC)) 214 return; 215 ms->voices[voice].inuse = 0; 216 } 217 218 int 219 midisyn_allocvoice(midisyn *ms, u_int32_t chan, u_int32_t note) 220 { 221 int bestv, v; 222 u_int bestseq, s; 223 224 if (!(ms->flags & MS_DOALLOC)) 225 return (chan); 226 /* Find a free voice, or if no free voice is found the oldest. */ 227 bestv = 0; 228 bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0); 229 for (v = 1; v < ms->nvoice; v++) { 230 s = ms->voices[v].seqno; 231 if (ms->voices[v].inuse) 232 s += 0x40000000; 233 if (s < bestseq) { 234 bestseq = s; 235 bestv = v; 236 } 237 } 238 DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n", 239 bestv, ms->voices[bestv].seqno, 240 ms->voices[bestv].chan_note, 241 ms->voices[bestv].inuse)); 242 #ifdef AUDIO_DEBUG 243 if (ms->voices[bestv].inuse) 244 DPRINTFN(1,("midisyn_allocvoice: steal %x\n", 245 ms->voices[bestv].chan_note)); 246 #endif 247 ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note); 248 ms->voices[bestv].seqno = ms->seqno++; 249 ms->voices[bestv].inuse = 1; 250 return (bestv); 251 } 252 253 int 254 midisyn_sysrt(void *addr, int b) 255 { 256 return 0; 257 } 258 259 int midisyn_channelmsg(void *addr, int status, int chan, u_char *buf, int len) 260 { 261 midisyn *ms = addr; 262 int voice = 0; /* initialize to keep gcc quiet */ 263 struct midisyn_methods *fs; 264 u_int32_t note, vel; 265 266 DPRINTF(("midisyn_channelmsg: ms=%p status=%#02x chan=%d\n", 267 ms, status, chan)); 268 fs = ms->mets; 269 note = buf[1]; 270 if (ms->flags & MS_FREQXLATE) 271 note = midisyn_note_to_freq(note); 272 vel = buf[2]; 273 274 switch (status) { 275 case MIDI_NOTEOFF: 276 voice = midisyn_findvoice(ms, chan, buf[1]); 277 if (voice >= 0) { 278 fs->noteoff(ms, voice, note, vel); 279 midisyn_freevoice(ms, voice); 280 } 281 break; 282 case MIDI_NOTEON: 283 voice = fs->allocv(ms, chan, buf[1]); 284 fs->noteon(ms, voice, note, vel); 285 break; 286 case MIDI_KEY_PRESSURE: 287 if (fs->keypres) { 288 voice = midisyn_findvoice(ms, voice, buf[1]); 289 if (voice >= 0) 290 fs->keypres(ms, voice, note, vel); 291 } 292 break; 293 case MIDI_CTL_CHANGE: 294 midictl_change(&ms->ctl, chan, buf+1); 295 break; 296 case MIDI_PGM_CHANGE: 297 if (fs->pgmchg) 298 fs->pgmchg(ms, chan, buf[1]); 299 break; 300 case MIDI_CHN_PRESSURE: 301 if (fs->chnpres) { 302 voice = midisyn_findvoice(ms, chan, buf[1]); 303 if (voice >= 0) /* XXX should do all voices on chan */ 304 fs->chnpres(ms, voice, note); 305 } 306 break; 307 case MIDI_PITCH_BEND: 308 if (fs->pitchb) { 309 voice = midisyn_findvoice(ms, chan, buf[1]); 310 if (voice >= 0) /* XXX buf1-2 are a 14-bit bend value */ 311 fs->pitchb(ms, chan, note, vel); 312 } 313 break; 314 } 315 return 0; 316 } 317 318 int midisyn_commonmsg(void *addr, int status, u_char *buf, int len) 319 { 320 return 0; 321 } 322 323 int midisyn_sysex(void *addr, u_char *buf, int len) 324 { 325 midisyn *ms = addr; 326 if (ms->mets->sysex) { 327 while ( len --> 0 ) 328 ms->mets->sysex(ms, *buf++); 329 } 330 return 0; 331 } 332 333 /* 334 * Convert a MIDI note to the corresponding frequency. 335 * The frequency is scaled by 2^16. 336 */ 337 u_int32_t 338 midisyn_note_to_freq(int note) 339 { 340 int o, n, f; 341 #define BASE_OCTAVE 5 342 static const u_int32_t notes[] = { 343 17145893, 18165441, 19245614, 20390018, 21602472, 22887021, 344 24247954, 25689813, 27217409, 28835840, 30550508, 32367136 345 }; 346 347 348 o = note / 12; 349 n = note % 12; 350 351 f = notes[n]; 352 353 if (o < BASE_OCTAVE) 354 f >>= (BASE_OCTAVE - o); 355 else if (o > BASE_OCTAVE) 356 f <<= (o - BASE_OCTAVE); 357 return (f); 358 } 359 360 u_int32_t 361 midisyn_finetune(u_int32_t base_freq, int bend, int range, int vibrato_cents) 362 { 363 static const u_int16_t semitone_tuning[24] = 364 { 365 /* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983, 366 /* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784, 367 /* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755 368 }; 369 static const u_int16_t cent_tuning[100] = 370 { 371 /* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041, 372 /* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087, 373 /* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134, 374 /* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181, 375 /* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228, 376 /* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275, 377 /* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323, 378 /* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371, 379 /* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419, 380 /* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467, 381 /* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515, 382 /* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564, 383 /* 96 */ 10570, 10576, 10582, 10589 384 }; 385 u_int32_t amount; 386 int negative, semitones, cents, multiplier; 387 388 if (range == 0) 389 return base_freq; 390 391 if (base_freq == 0) 392 return base_freq; 393 394 if (range >= 8192) 395 range = 8192; 396 397 bend = bend * range / 8192; 398 bend += vibrato_cents; 399 400 if (bend == 0) 401 return base_freq; 402 403 if (bend < 0) { 404 bend = -bend; 405 negative = 1; 406 } else 407 negative = 0; 408 409 if (bend > range) 410 bend = range; 411 412 multiplier = 1; 413 while (bend > 2399) { 414 multiplier *= 4; 415 bend -= 2400; 416 } 417 418 semitones = bend / 100; 419 cents = bend % 100; 420 421 amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents] 422 / 10000; 423 424 if (negative) 425 return (base_freq * 10000 / amount); /* Bend down */ 426 else 427 return (base_freq * amount / 10000); /* Bend up */ 428 } 429 430 static void 431 midisyn_notify(void *cookie, midictl_evt evt, 432 uint_fast8_t chan, uint_fast16_t key) 433 { 434 } 435
Indexes created Thu Oct 02 14:10:14 GMT 2025