midisyn.c revision 1.8
1 /* $NetBSD: midisyn.c,v 1.8 2001/10/02 22:41:22 augustss 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/param.h> 40 #include <sys/ioctl.h> 41 #include <sys/fcntl.h> 42 #include <sys/vnode.h> 43 #include <sys/select.h> 44 #include <sys/proc.h> 45 #include <sys/malloc.h> 46 #include <sys/systm.h> 47 #include <sys/syslog.h> 48 #include <sys/kernel.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(midisyn *, int, int); 68 void midisyn_freevoice(midisyn *, int); 69 int midisyn_allocvoice(midisyn *, u_int32_t, u_int32_t); 70 u_int32_t midisyn_note_to_freq(int); 71 u_int32_t midisyn_finetune(u_int32_t, int, int, int); 72 73 int midisyn_open(void *, int, 74 void (*iintr)(void *, int), 75 void (*ointr)(void *), void *arg); 76 void midisyn_close(void *); 77 int midisyn_output(void *, int); 78 void midisyn_getinfo(void *, struct midi_info *); 79 int midisyn_ioctl(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 const 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(void *addr, int flags, void (*iintr)(void *, int), 95 void (*ointr)(void *), void *arg) 96 { 97 midisyn *ms = addr; 98 99 DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets)); 100 if (ms->mets->open) 101 return (ms->mets->open(ms, flags)); 102 else 103 return (0); 104 } 105 106 void 107 midisyn_close(void *addr) 108 { 109 midisyn *ms = addr; 110 struct midisyn_methods *fs; 111 int v; 112 113 DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets)); 114 fs = ms->mets; 115 for (v = 0; v < ms->nvoice; v++) 116 if (ms->voices[v].inuse) { 117 fs->noteoff(ms, v, 0, 0); 118 midisyn_freevoice(ms, v); 119 } 120 if (fs->close) 121 fs->close(ms); 122 } 123 124 void 125 midisyn_getinfo(void *addr, struct midi_info *mi) 126 { 127 midisyn *ms = addr; 128 129 mi->name = ms->name; 130 mi->props = 0; 131 } 132 133 int 134 midisyn_ioctl(void *maddr, u_long cmd, caddr_t addr, int flag, struct proc *p) 135 { 136 midisyn *ms = maddr; 137 138 if (ms->mets->ioctl) 139 return (ms->mets->ioctl(ms, cmd, addr, flag, p)); 140 else 141 return (EINVAL); 142 } 143 144 int 145 midisyn_findvoice(midisyn *ms, int chan, int note) 146 { 147 u_int cn; 148 int v; 149 150 if (!(ms->flags & MS_DOALLOC)) 151 return (chan); 152 cn = MS_CHANNOTE(chan, note); 153 for (v = 0; v < ms->nvoice; v++) 154 if (ms->voices[v].chan_note == cn && ms->voices[v].inuse) 155 return (v); 156 return (-1); 157 } 158 159 void 160 midisyn_attach(struct midi_softc *sc, midisyn *ms) 161 { 162 if (ms->flags & MS_DOALLOC) { 163 ms->voices = malloc(ms->nvoice * sizeof (struct voice), 164 M_DEVBUF, M_WAITOK); 165 memset(ms->voices, 0, ms->nvoice * sizeof (struct voice)); 166 ms->seqno = 1; 167 if (ms->mets->allocv == 0) 168 ms->mets->allocv = &midisyn_allocvoice; 169 } 170 sc->hw_if = &midisyn_hw_if; 171 sc->hw_hdl = ms; 172 DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl)); 173 } 174 175 void 176 midisyn_freevoice(midisyn *ms, int voice) 177 { 178 if (!(ms->flags & MS_DOALLOC)) 179 return; 180 ms->voices[voice].inuse = 0; 181 } 182 183 int 184 midisyn_allocvoice(midisyn *ms, u_int32_t chan, u_int32_t note) 185 { 186 int bestv, v; 187 u_int bestseq, s; 188 189 if (!(ms->flags & MS_DOALLOC)) 190 return (chan); 191 /* Find a free voice, or if no free voice is found the oldest. */ 192 bestv = 0; 193 bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0); 194 for (v = 1; v < ms->nvoice; v++) { 195 s = ms->voices[v].seqno; 196 if (ms->voices[v].inuse) 197 s += 0x40000000; 198 if (s < bestseq) { 199 bestseq = s; 200 bestv = v; 201 } 202 } 203 DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n", 204 bestv, ms->voices[bestv].seqno, 205 ms->voices[bestv].chan_note, 206 ms->voices[bestv].inuse)); 207 #ifdef AUDIO_DEBUG 208 if (ms->voices[bestv].inuse) 209 DPRINTFN(1,("midisyn_allocvoice: steal %x\n", 210 ms->voices[bestv].chan_note)); 211 #endif 212 ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note); 213 ms->voices[bestv].seqno = ms->seqno++; 214 ms->voices[bestv].inuse = 1; 215 return (bestv); 216 } 217 218 int 219 midisyn_output(void *addr, int b) 220 { 221 midisyn *ms = addr; 222 u_int8_t status, chan; 223 int voice = 0; /* initialize to keep gcc quiet */ 224 struct midisyn_methods *fs; 225 u_int32_t note, vel; 226 227 DPRINTF(("midisyn_output: ms=%p b=0x%02x\n", ms, b)); 228 fs = ms->mets; 229 if (ms->pos < 0) { 230 /* Doing SYSEX */ 231 DPRINTF(("midisyn_output: sysex 0x%02x\n", b)); 232 if (fs->sysex) 233 fs->sysex(ms, b); 234 if (b == MIDI_SYSEX_END) 235 ms->pos = 0; 236 return (0); 237 } 238 if (ms->pos == 0 && !MIDI_IS_STATUS(b)) 239 ms->pos++; /* repeat last status byte */ 240 ms->buf[ms->pos++] = b; 241 status = ms->buf[0]; 242 if (ms->pos < MIDI_LENGTH(status)) 243 return (0); 244 /* Decode the MIDI command */ 245 chan = MIDI_GET_CHAN(status); 246 note = ms->buf[1]; 247 if (ms->flags & MS_FREQXLATE) 248 note = midisyn_note_to_freq(note); 249 vel = ms->buf[2]; 250 switch (MIDI_GET_STATUS(status)) { 251 case MIDI_NOTEOFF: 252 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 253 if (voice >= 0) { 254 fs->noteoff(ms, voice, note, vel); 255 midisyn_freevoice(ms, voice); 256 } 257 break; 258 case MIDI_NOTEON: 259 voice = fs->allocv(ms, chan, ms->buf[1]); 260 fs->noteon(ms, voice, note, vel); 261 break; 262 case MIDI_KEY_PRESSURE: 263 if (fs->keypres) { 264 voice = midisyn_findvoice(ms, voice, ms->buf[1]); 265 if (voice >= 0) 266 fs->keypres(ms, voice, note, vel); 267 } 268 break; 269 case MIDI_CTL_CHANGE: 270 if (fs->ctlchg) 271 fs->ctlchg(ms, chan, ms->buf[1], vel); 272 break; 273 case MIDI_PGM_CHANGE: 274 if (fs->pgmchg) 275 fs->pgmchg(ms, chan, ms->buf[1]); 276 break; 277 case MIDI_CHN_PRESSURE: 278 if (fs->chnpres) { 279 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 280 if (voice >= 0) 281 fs->chnpres(ms, voice, note); 282 } 283 break; 284 case MIDI_PITCH_BEND: 285 if (fs->pitchb) { 286 voice = midisyn_findvoice(ms, chan, ms->buf[1]); 287 if (voice >= 0) 288 fs->pitchb(ms, chan, note, vel); 289 } 290 break; 291 case MIDI_SYSTEM_PREFIX: 292 if (fs->sysex) 293 fs->sysex(ms, status); 294 ms->pos = -1; 295 return (0); 296 } 297 ms->pos = 0; 298 return (0); 299 } 300 301 /* 302 * Convert a MIDI note to the corresponding frequency. 303 * The frequency is scaled by 2^16. 304 */ 305 u_int32_t 306 midisyn_note_to_freq(int note) 307 { 308 int o, n, f; 309 #define BASE_OCTAVE 5 310 static const u_int32_t notes[] = { 311 17145893, 18165441, 19245614, 20390018, 21602472, 22887021, 312 24247954, 25689813, 27217409, 28835840, 30550508, 32367136 313 }; 314 315 316 o = note / 12; 317 n = note % 12; 318 319 f = notes[n]; 320 321 if (o < BASE_OCTAVE) 322 f >>= (BASE_OCTAVE - o); 323 else if (o > BASE_OCTAVE) 324 f <<= (o - BASE_OCTAVE); 325 return (f); 326 } 327 328 u_int32_t 329 midisyn_finetune(u_int32_t base_freq, int bend, int range, int vibrato_cents) 330 { 331 static const u_int16_t semitone_tuning[24] = 332 { 333 /* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983, 334 /* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784, 335 /* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755 336 }; 337 static const u_int16_t cent_tuning[100] = 338 { 339 /* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041, 340 /* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087, 341 /* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134, 342 /* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181, 343 /* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228, 344 /* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275, 345 /* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323, 346 /* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371, 347 /* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419, 348 /* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467, 349 /* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515, 350 /* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564, 351 /* 96 */ 10570, 10576, 10582, 10589 352 }; 353 u_int32_t amount; 354 int negative, semitones, cents, multiplier; 355 356 if (range == 0) 357 return base_freq; 358 359 if (base_freq == 0) 360 return base_freq; 361 362 if (range >= 8192) 363 range = 8192; 364 365 bend = bend * range / 8192; 366 bend += vibrato_cents; 367 368 if (bend == 0) 369 return base_freq; 370 371 if (bend < 0) { 372 bend = -bend; 373 negative = 1; 374 } else 375 negative = 0; 376 377 if (bend > range) 378 bend = range; 379 380 multiplier = 1; 381 while (bend > 2399) { 382 multiplier *= 4; 383 bend -= 2400; 384 } 385 386 semitones = bend / 100; 387 if (semitones > 99) 388 semitones = 99; 389 cents = bend % 100; 390 391 amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents] 392 / 10000; 393 394 if (negative) 395 return (base_freq * 10000 / amount); /* Bend down */ 396 else 397 return (base_freq * amount / 10000); /* Bend up */ 398 } 399 400
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