midisyn.c revision 1.17.2.11
1 /* $NetBSD: midisyn.c,v 1.17.2.11 2006/05/31 03:17:06 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 1.17.2.11 2006/05/31 03:17:06 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 int midisyn_open(void *, int, 77 void (*iintr)(void *, int), 78 void (*ointr)(void *), void *arg); 79 void midisyn_close(void *); 80 int midisyn_sysrt(void *, int); 81 void midisyn_getinfo(void *, struct midi_info *); 82 int midisyn_ioctl(void *, u_long, caddr_t, int, struct lwp *); 83 84 const struct midi_hw_if midisyn_hw_if = { 85 midisyn_open, 86 midisyn_close, 87 midisyn_sysrt, 88 midisyn_getinfo, 89 midisyn_ioctl, 90 }; 91 92 int midisyn_channelmsg(void *, int, int, u_char *, int); 93 int midisyn_commonmsg(void *, int, u_char *, int); 94 int midisyn_sysex(void *, u_char *, int); 95 96 struct midi_hw_if_ext midisyn_hw_if_ext = { 97 .channel = midisyn_channelmsg, 98 .common = midisyn_commonmsg, 99 .sysex = midisyn_sysex, 100 }; 101 102 int 103 midisyn_open(void *addr, int flags, void (*iintr)(void *, int), 104 void (*ointr)(void *), void *arg) 105 { 106 midisyn *ms = addr; 107 108 DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets)); 109 if (ms->mets->open) 110 return (ms->mets->open(ms, flags)); 111 else 112 return (0); 113 } 114 115 void 116 midisyn_close(void *addr) 117 { 118 midisyn *ms = addr; 119 struct midisyn_methods *fs; 120 int v; 121 122 DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets)); 123 fs = ms->mets; 124 for (v = 0; v < ms->nvoice; v++) 125 if (ms->voices[v].inuse) { 126 fs->noteoff(ms, v, 0, 0); 127 midisyn_freevoice(ms, v); 128 } 129 if (fs->close) 130 fs->close(ms); 131 } 132 133 void 134 midisyn_getinfo(void *addr, struct midi_info *mi) 135 { 136 midisyn *ms = addr; 137 138 mi->name = ms->name; 139 /* 140 * I was going to add a property here to suppress midi(4)'s warning 141 * about an output device that uses no transmit interrupt, on the 142 * assumption that as an onboard synth we handle "output" internally 143 * with nothing like the 320 us per byte busy wait of a dumb UART. 144 * Then I noticed that opl (at least as currently implemented) seems 145 * to need 40 us busy wait to set each register on an OPL2, and sets 146 * about 21 registers for every note-on. (Half of that is patch loading 147 * and could probably be reduced by different management of voices and 148 * patches.) For now I won't bother suppressing that warning.... 149 */ 150 mi->props = 0; 151 152 midi_register_hw_if_ext(&midisyn_hw_if_ext); 153 } 154 155 int 156 midisyn_ioctl(void *maddr, u_long cmd, caddr_t addr, int flag, struct lwp *l) 157 { 158 midisyn *ms = maddr; 159 160 if (ms->mets->ioctl) 161 return (ms->mets->ioctl(ms, cmd, addr, flag, l)); 162 else 163 return (EINVAL); 164 } 165 166 int 167 midisyn_findvoice(midisyn *ms, int chan, int note) 168 { 169 u_int cn; 170 int v; 171 172 if (!(ms->flags & MS_DOALLOC)) 173 return (chan); 174 cn = MS_CHANNOTE(chan, note); 175 for (v = 0; v < ms->nvoice; v++) 176 if (ms->voices[v].chan_note == cn && ms->voices[v].inuse) 177 return (v); 178 return (-1); 179 } 180 181 void 182 midisyn_attach(struct midi_softc *sc, midisyn *ms) 183 { 184 if (ms->flags & MS_DOALLOC) { 185 ms->voices = malloc(ms->nvoice * sizeof (struct voice), 186 M_DEVBUF, M_WAITOK|M_ZERO); 187 ms->seqno = 1; 188 if (ms->mets->allocv == 0) 189 ms->mets->allocv = &midisyn_allocvoice; 190 } 191 sc->hw_if = &midisyn_hw_if; 192 sc->hw_hdl = ms; 193 DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl)); 194 } 195 196 void 197 midisyn_freevoice(midisyn *ms, int voice) 198 { 199 if (!(ms->flags & MS_DOALLOC)) 200 return; 201 ms->voices[voice].inuse = 0; 202 } 203 204 int 205 midisyn_allocvoice(midisyn *ms, u_int32_t chan, u_int32_t note) 206 { 207 int bestv, v; 208 u_int bestseq, s; 209 210 if (!(ms->flags & MS_DOALLOC)) 211 return (chan); 212 /* Find a free voice, or if no free voice is found the oldest. */ 213 bestv = 0; 214 bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0); 215 for (v = 1; v < ms->nvoice; v++) { 216 s = ms->voices[v].seqno; 217 if (ms->voices[v].inuse) 218 s += 0x40000000; 219 if (s < bestseq) { 220 bestseq = s; 221 bestv = v; 222 } 223 } 224 DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n", 225 bestv, ms->voices[bestv].seqno, 226 ms->voices[bestv].chan_note, 227 ms->voices[bestv].inuse)); 228 #ifdef AUDIO_DEBUG 229 if (ms->voices[bestv].inuse) 230 DPRINTFN(1,("midisyn_allocvoice: steal %x\n", 231 ms->voices[bestv].chan_note)); 232 #endif 233 ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note); 234 ms->voices[bestv].seqno = ms->seqno++; 235 ms->voices[bestv].inuse = 1; 236 return (bestv); 237 } 238 239 int 240 midisyn_sysrt(void *addr, int b) 241 { 242 return 0; 243 } 244 245 int midisyn_channelmsg(void *addr, int status, int chan, u_char *buf, int len) 246 { 247 midisyn *ms = addr; 248 int voice = 0; /* initialize to keep gcc quiet */ 249 struct midisyn_methods *fs; 250 u_int32_t note, vel; 251 252 DPRINTF(("midisyn_channelmsg: ms=%p status=%#02x chan=%d\n", 253 ms, status, chan)); 254 fs = ms->mets; 255 note = buf[1]; 256 if (ms->flags & MS_FREQXLATE) 257 note = midisyn_note_to_freq(note); 258 vel = buf[2]; 259 260 switch (status) { 261 case MIDI_NOTEOFF: 262 voice = midisyn_findvoice(ms, chan, buf[1]); 263 if (voice >= 0) { 264 fs->noteoff(ms, voice, note, vel); 265 midisyn_freevoice(ms, voice); 266 } 267 break; 268 case MIDI_NOTEON: 269 voice = fs->allocv(ms, chan, buf[1]); 270 fs->noteon(ms, voice, note, vel); 271 break; 272 case MIDI_KEY_PRESSURE: 273 if (fs->keypres) { 274 voice = midisyn_findvoice(ms, voice, buf[1]); 275 if (voice >= 0) 276 fs->keypres(ms, voice, note, vel); 277 } 278 break; 279 case MIDI_CTL_CHANGE: 280 if (fs->ctlchg) 281 fs->ctlchg(ms, chan, buf[1], vel); 282 break; 283 case MIDI_PGM_CHANGE: 284 if (fs->pgmchg) 285 fs->pgmchg(ms, chan, buf[1]); 286 break; 287 case MIDI_CHN_PRESSURE: 288 if (fs->chnpres) { 289 voice = midisyn_findvoice(ms, chan, buf[1]); 290 if (voice >= 0) /* XXX should do all voices on chan */ 291 fs->chnpres(ms, voice, note); 292 } 293 break; 294 case MIDI_PITCH_BEND: 295 if (fs->pitchb) { 296 voice = midisyn_findvoice(ms, chan, buf[1]); 297 if (voice >= 0) /* XXX buf1-2 are a 14-bit bend value */ 298 fs->pitchb(ms, chan, note, vel); 299 } 300 break; 301 } 302 return 0; 303 } 304 305 int midisyn_commonmsg(void *addr, int status, u_char *buf, int len) 306 { 307 return 0; 308 } 309 310 int midisyn_sysex(void *addr, u_char *buf, int len) 311 { 312 midisyn *ms = addr; 313 if (ms->mets->sysex) { 314 while ( len --> 0 ) 315 ms->mets->sysex(ms, *buf++); 316 } 317 return 0; 318 } 319 320 /* 321 * Convert a MIDI note to the corresponding frequency. 322 * The frequency is scaled by 2^16. 323 */ 324 u_int32_t 325 midisyn_note_to_freq(int note) 326 { 327 int o, n, f; 328 #define BASE_OCTAVE 5 329 static const u_int32_t notes[] = { 330 17145893, 18165441, 19245614, 20390018, 21602472, 22887021, 331 24247954, 25689813, 27217409, 28835840, 30550508, 32367136 332 }; 333 334 335 o = note / 12; 336 n = note % 12; 337 338 f = notes[n]; 339 340 if (o < BASE_OCTAVE) 341 f >>= (BASE_OCTAVE - o); 342 else if (o > BASE_OCTAVE) 343 f <<= (o - BASE_OCTAVE); 344 return (f); 345 } 346 347 u_int32_t 348 midisyn_finetune(u_int32_t base_freq, int bend, int range, int vibrato_cents) 349 { 350 static const u_int16_t semitone_tuning[24] = 351 { 352 /* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983, 353 /* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784, 354 /* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755 355 }; 356 static const u_int16_t cent_tuning[100] = 357 { 358 /* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041, 359 /* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087, 360 /* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134, 361 /* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181, 362 /* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228, 363 /* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275, 364 /* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323, 365 /* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371, 366 /* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419, 367 /* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467, 368 /* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515, 369 /* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564, 370 /* 96 */ 10570, 10576, 10582, 10589 371 }; 372 u_int32_t amount; 373 int negative, semitones, cents, multiplier; 374 375 if (range == 0) 376 return base_freq; 377 378 if (base_freq == 0) 379 return base_freq; 380 381 if (range >= 8192) 382 range = 8192; 383 384 bend = bend * range / 8192; 385 bend += vibrato_cents; 386 387 if (bend == 0) 388 return base_freq; 389 390 if (bend < 0) { 391 bend = -bend; 392 negative = 1; 393 } else 394 negative = 0; 395 396 if (bend > range) 397 bend = range; 398 399 multiplier = 1; 400 while (bend > 2399) { 401 multiplier *= 4; 402 bend -= 2400; 403 } 404 405 semitones = bend / 100; 406 cents = bend % 100; 407 408 amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents] 409 / 10000; 410 411 if (negative) 412 return (base_freq * 10000 / amount); /* Bend down */ 413 else 414 return (base_freq * amount / 10000); /* Bend up */ 415 } 416 417
Indexes created Thu Oct 02 14:10:14 GMT 2025