midisyn.c revision 1.4
1 /* $NetBSD: midisyn.c,v 1.4 1998/09/13 04:41:34 mycroft Exp $ */ 2 3 /* 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Author: Lennart Augustsson 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the NetBSD 20 * Foundation, Inc. and its contributors. 21 * 4. Neither the name of The NetBSD Foundation nor the names of its 22 * contributors may be used to endorse or promote products derived 23 * from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/ioctl.h> 40 #include <sys/fcntl.h> 41 #include <sys/vnode.h> 42 #include <sys/select.h> 43 #include <sys/proc.h> 44 #include <sys/malloc.h> 45 #include <sys/systm.h> 46 #include <sys/syslog.h> 47 #include <sys/kernel.h> 48 #include <sys/conf.h> 49 #include <sys/audioio.h> 50 #include <sys/midiio.h> 51 #include <sys/device.h> 52 53 #include <dev/audio_if.h> 54 #include <dev/midi_if.h> 55 #include <dev/midivar.h> 56 #include <dev/midisynvar.h> 57 58 #ifdef AUDIO_DEBUG 59 #define DPRINTF(x) if (midisyndebug) printf x 60 #define DPRINTFN(n,x) if (midisyndebug >= (n)) printf x 61 int midisyndebug = 0; 62 #else 63 #define DPRINTF(x) 64 #define DPRINTFN(n,x) 65 #endif 66 67 int midisyn_findvoice __P((midisyn *, int, int)); 68 void midisyn_freevoice __P((midisyn *, int)); 69 int midisyn_allocvoice __P((midisyn *, u_int32_t, u_int32_t)); 70 u_int32_t midisyn_note_to_freq __P((int)); 71 u_int32_t midisyn_finetune __P((u_int32_t, int, int, int)); 72 73 int midisyn_open __P((void *, int, 74 void (*iintr)__P((void *, int)), 75 void (*ointr)__P((void *)), void *arg)); 76 void midisyn_close __P((void *)); 77 int midisyn_output __P((void *, int)); 78 void midisyn_getinfo __P((void *, struct midi_info *)); 79 int midisyn_ioctl __P((void *, u_long, caddr_t, int, struct proc *)); 80 81 struct midi_hw_if midisyn_hw_if = { 82 midisyn_open, 83 midisyn_close, 84 midisyn_output, 85 midisyn_getinfo, 86 midisyn_ioctl, 87 }; 88 89 static int midi_lengths[] = { 3,3,3,3,2,2,3,1 }; 90 /* Number of bytes in a MIDI command, including status */ 91 #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7]) 92 93 int 94 midisyn_open(addr, flags, iintr, ointr, arg) 95 void *addr; 96 int flags; 97 void (*iintr)__P((void *, int)); 98 void (*ointr)__P((void *)); 99 void *arg; 100 { 101 midisyn *ms = addr; 102 103 DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets)); 104 if (ms->mets->open) 105 return (ms->mets->open(ms, flags)); 106 else 107 return (0); 108 } 109 110 void 111 midisyn_close(addr) 112 void *addr; 113 { 114 midisyn *ms = addr; 115 struct midisyn_methods *fs; 116 int v; 117 118 DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets)); 119 fs = ms->mets; 120 for (v = 0; v < ms->nvoice; v++) 121 if (ms->voices[v].inuse) { 122 fs->noteoff(ms, v, 0, 0); 123 midisyn_freevoice(ms, v); 124 } 125 if (fs->close) 126 fs->close(ms); 127 } 128 129 void 130 midisyn_getinfo(addr, mi) 131 void *addr; 132 struct midi_info *mi; 133 { 134 midisyn *ms = addr; 135 136 mi->name = ms->name; 137 mi->props = 0; 138 } 139 140 int 141 midisyn_ioctl(maddr, cmd, addr, flag, p) 142 void *maddr; 143 u_long cmd; 144 caddr_t addr; 145 int flag; 146 struct proc *p; 147 { 148 midisyn *ms = maddr; 149 150 if (ms->mets->ioctl) 151 return (ms->mets->ioctl(ms, cmd, addr, flag, p)); 152 else 153 return (EINVAL); 154 } 155 156 int 157 midisyn_findvoice(ms, chan, note) 158 midisyn *ms; 159 int chan, note; 160 { 161 u_int cn; 162 int v; 163 164 if (!(ms->flags & MS_DOALLOC)) 165 return (chan); 166 cn = MS_CHANNOTE(chan, note); 167 for (v = 0; v < ms->nvoice; v++) 168 if (ms->voices[v].chan_note == cn && ms->voices[v].inuse) 169 return (v); 170 return (-1); 171 } 172 173 void 174 midisyn_attach(sc, ms) 175 struct midi_softc *sc; 176 midisyn *ms; 177 { 178 if (ms->flags & MS_DOALLOC) { 179 ms->voices = malloc(ms->nvoice * sizeof (struct voice), 180 M_DEVBUF, M_WAITOK); 181 memset(ms->voices, 0, ms->nvoice * sizeof (struct voice)); 182 ms->seqno = 1; 183 if (ms->mets->allocv == 0) 184 ms->mets->allocv = &midisyn_allocvoice; 185 } 186 sc->hw_if = &midisyn_hw_if; 187 sc->hw_hdl = ms; 188 DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl)); 189 } 190 191 void 192 midisyn_freevoice(ms, voice) 193 midisyn *ms; 194 int voice; 195 { 196 if (!(ms->flags & MS_DOALLOC)) 197 return; 198 ms->voices[voice].inuse = 0; 199 } 200 201 int 202 midisyn_allocvoice(ms, chan, note) 203 midisyn *ms; 204 u_int32_t chan, note; 205 { 206 int bestv, v; 207 u_int bestseq, s; 208 209 if (!(ms->flags & MS_DOALLOC)) 210 return (chan); 211 /* Find a free voice, or if no free voice is found the oldest. */ 212 bestv = 0; 213 bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0); 214 for (v = 1; v < ms->nvoice; v++) { 215 s = ms->voices[v].seqno; 216 if (ms->voices[v].inuse) 217 s += 0x40000000; 218 if (s < bestseq) { 219 bestseq = s; 220 bestv = v; 221 } 222 } 223 DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n", 224 bestv, ms->voices[bestv].seqno, 225 ms->voices[bestv].chan_note, 226 ms->voices[bestv].inuse)); 227 #ifdef AUDIO_DEBUG 228 if (ms->voices[bestv].inuse) 229 DPRINTFN(1,("midisyn_allocvoice: steal %x\n", 230 ms->voices[bestv].chan_note)); 231 #endif 232 ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note); 233 ms->voices[bestv].seqno = ms->seqno++; 234 ms->voices[bestv].inuse = 1; 235 return (bestv); 236 } 237 238 int 239 midisyn_output(addr, b) 240 void *addr; 241 int b; 242 { 243 midisyn *ms = addr; 244 u_int8_t status, chan; 245 int voice = 0; /* initialize to keep gcc quiet */ 246 struct midisyn_methods *fs; 247 u_int32_t note, vel; 248 249 DPRINTF(("midisyn_output: ms=%p b=0x%02x\n", ms, b)); 250 fs = ms->mets; 251 if (ms->pos < 0) { 252 /* Doing SYSEX */ 253 DPRINTF(("midisyn_output: sysex 0x%02x\n", b)); 254 if (fs->sysex) 255 fs->sysex(ms, b); 256 if (b == MIDI_SYSEX_END) 257 ms->pos = 0; 258 return (0); 259 } 260 if (ms->pos == 0 && !MIDI_IS_STATUS(b)) 261 ms->pos++; /* repeat last status byte */ 262 ms->buf[ms->pos++] = b; 263 status = ms->buf[0]; 264 if (ms->pos < MIDI_LENGTH(status)) 265 return (0); 266 /* Decode the MIDI command */ 267 chan = MIDI_GET_CHAN(status); 268 note = ms->buf[1]; 269 if (ms->flags & MS_FREQXLATE) 270 note = midisyn_note_to_freq(note); 271 vel = ms->buf[2]; 272 switch (MIDI_GET_STATUS(status)) { 273 case MIDI_NOTEOFF: 274 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 275 if (voice >= 0) { 276 fs->noteoff(ms, voice, note, vel); 277 midisyn_freevoice(ms, voice); 278 } 279 break; 280 case MIDI_NOTEON: 281 voice = fs->allocv(ms, chan, ms->buf[1]); 282 fs->noteon(ms, voice, note, vel); 283 break; 284 case MIDI_KEY_PRESSURE: 285 if (fs->keypres) { 286 voice = midisyn_findvoice(ms, voice, ms->buf[1]); 287 if (voice >= 0) 288 fs->keypres(ms, voice, note, vel); 289 } 290 break; 291 case MIDI_CTL_CHANGE: 292 if (fs->ctlchg) 293 fs->ctlchg(ms, chan, ms->buf[1], vel); 294 break; 295 case MIDI_PGM_CHANGE: 296 if (fs->pgmchg) 297 fs->pgmchg(ms, chan, ms->buf[1]); 298 break; 299 case MIDI_CHN_PRESSURE: 300 if (fs->chnpres) { 301 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 302 if (voice >= 0) 303 fs->chnpres(ms, voice, note); 304 } 305 break; 306 case MIDI_PITCH_BEND: 307 if (fs->pitchb) { 308 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 309 if (voice >= 0) 310 fs->pitchb(ms, chan, note, vel); 311 } 312 break; 313 case MIDI_SYSTEM_PREFIX: 314 if (fs->sysex) 315 fs->sysex(ms, status); 316 ms->pos = -1; 317 return (0); 318 } 319 ms->pos = 0; 320 return (0); 321 } 322 323 /* 324 * Convert a MIDI note to the corresponding frequency. 325 * The frequency is scaled by 2^16. 326 */ 327 u_int32_t 328 midisyn_note_to_freq(note) 329 int note; 330 { 331 int o, n, f; 332 #define BASE_OCTAVE 5 333 static u_int32_t notes[] = { 334 17145893, 18165441, 19245614, 20390018, 21602472, 22887021, 335 24247954, 25689813, 27217409, 28835840, 30550508, 32367136 336 }; 337 338 339 o = note / 12; 340 n = note % 12; 341 342 f = notes[n]; 343 344 if (o < BASE_OCTAVE) 345 f >>= (BASE_OCTAVE - o); 346 else if (o > BASE_OCTAVE) 347 f <<= (o - BASE_OCTAVE); 348 return (f); 349 } 350 351 u_int32_t 352 midisyn_finetune(base_freq, bend, range, vibrato_cents) 353 u_int32_t base_freq; 354 int bend; 355 int range; 356 int vibrato_cents; 357 { 358 static u_int16_t semitone_tuning[24] = 359 { 360 /* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983, 361 /* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784, 362 /* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755 363 }; 364 static u_int16_t cent_tuning[100] = 365 { 366 /* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041, 367 /* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087, 368 /* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134, 369 /* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181, 370 /* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228, 371 /* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275, 372 /* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323, 373 /* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371, 374 /* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419, 375 /* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467, 376 /* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515, 377 /* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564, 378 /* 96 */ 10570, 10576, 10582, 10589 379 }; 380 u_int32_t amount; 381 int negative, semitones, cents, multiplier; 382 383 if (range == 0) 384 return base_freq; 385 386 if (base_freq == 0) 387 return base_freq; 388 389 if (range >= 8192) 390 range = 8192; 391 392 bend = bend * range / 8192; 393 bend += vibrato_cents; 394 395 if (bend == 0) 396 return base_freq; 397 398 if (bend < 0) { 399 bend = -bend; 400 negative = 1; 401 } else 402 negative = 0; 403 404 if (bend > range) 405 bend = range; 406 407 multiplier = 1; 408 while (bend > 2399) { 409 multiplier *= 4; 410 bend -= 2400; 411 } 412 413 semitones = bend / 100; 414 if (semitones > 99) 415 semitones = 99; 416 cents = bend % 100; 417 418 amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents] 419 / 10000; 420 421 if (negative) 422 return (base_freq * 10000 / amount); /* Bend down */ 423 else 424 return (base_freq * amount / 10000); /* Bend up */ 425 } 426 427
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