/* $OpenBSD: midisyn.c,v 1.6 2006/04/07 22:41:32 jsg Exp $ */ /* $NetBSD: midisyn.c,v 1.5 1998/11/25 22:17:07 augustss Exp $ */ /* * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Lennart Augustsson (augustss@netbsd.org). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef AUDIO_DEBUG #define DPRINTF(x) if (midisyndebug) printf x #define DPRINTFN(n,x) if (midisyndebug >= (n)) printf x int midisyndebug = 0; #else #define DPRINTF(x) #define DPRINTFN(n,x) #endif int midisyn_findvoice(midisyn *, int, int); void midisyn_freevoice(midisyn *, int); int midisyn_allocvoice(midisyn *, u_int32_t, u_int32_t); u_int32_t midisyn_note_to_freq(int); u_int32_t midisyn_finetune(u_int32_t, int, int, int); int midisyn_open(void *, int, void (*iintr)(void *, int), void (*ointr)(void *), void *arg); void midisyn_close(void *); int midisyn_output(void *, int); void midisyn_getinfo(void *, struct midi_info *); int midisyn_ioctl(void *, u_long, caddr_t, int, struct proc *); struct midi_hw_if midisyn_hw_if = { midisyn_open, midisyn_close, midisyn_output, NULL, /* flush */ midisyn_getinfo, midisyn_ioctl, }; static int midi_lengths[] = { 3,3,3,3,2,2,3,1 }; /* Number of bytes in a MIDI command, including status */ #define MIDI_LENGTH(d) (midi_lengths[((d) >> 4) & 7]) int midisyn_open(addr, flags, iintr, ointr, arg) void *addr; int flags; void (*iintr)(void *, int); void (*ointr)(void *); void *arg; { midisyn *ms = addr; DPRINTF(("midisyn_open: ms=%p ms->mets=%p\n", ms, ms->mets)); if (ms->mets->open) return (ms->mets->open(ms, flags)); else return (0); } void midisyn_close(addr) void *addr; { midisyn *ms = addr; struct midisyn_methods *fs; int v; DPRINTF(("midisyn_close: ms=%p ms->mets=%p\n", ms, ms->mets)); fs = ms->mets; for (v = 0; v < ms->nvoice; v++) if (ms->voices[v].inuse) { fs->noteoff(ms, v, 0, 0); midisyn_freevoice(ms, v); } if (fs->close) fs->close(ms); } void midisyn_getinfo(addr, mi) void *addr; struct midi_info *mi; { midisyn *ms = addr; mi->name = ms->name; mi->props = 0; } int midisyn_ioctl(maddr, cmd, addr, flag, p) void *maddr; u_long cmd; caddr_t addr; int flag; struct proc *p; { midisyn *ms = maddr; if (ms->mets->ioctl) return (ms->mets->ioctl(ms, cmd, addr, flag, p)); else return (EINVAL); } int midisyn_findvoice(ms, chan, note) midisyn *ms; int chan, note; { u_int cn; int v; if (!(ms->flags & MS_DOALLOC)) return (chan); cn = MS_CHANNOTE(chan, note); for (v = 0; v < ms->nvoice; v++) if (ms->voices[v].chan_note == cn && ms->voices[v].inuse) return (v); return (-1); } void midisyn_attach(sc, ms) struct midi_softc *sc; midisyn *ms; { if (ms->flags & MS_DOALLOC) { ms->voices = malloc(ms->nvoice * sizeof (struct voice), M_DEVBUF, M_WAITOK); memset(ms->voices, 0, ms->nvoice * sizeof (struct voice)); ms->seqno = 1; if (ms->mets->allocv == 0) ms->mets->allocv = &midisyn_allocvoice; } sc->hw_if = &midisyn_hw_if; sc->hw_hdl = ms; DPRINTF(("midisyn_attach: ms=%p\n", sc->hw_hdl)); } void midisyn_freevoice(ms, voice) midisyn *ms; int voice; { if (!(ms->flags & MS_DOALLOC)) return; ms->voices[voice].inuse = 0; } int midisyn_allocvoice(ms, chan, note) midisyn *ms; u_int32_t chan, note; { int bestv, v; u_int bestseq, s; if (!(ms->flags & MS_DOALLOC)) return (chan); /* Find a free voice, or if no free voice is found the oldest. */ bestv = 0; bestseq = ms->voices[0].seqno + (ms->voices[0].inuse ? 0x40000000 : 0); for (v = 1; v < ms->nvoice; v++) { s = ms->voices[v].seqno; if (ms->voices[v].inuse) s += 0x40000000; if (s < bestseq) { bestseq = s; bestv = v; } } DPRINTFN(10,("midisyn_allocvoice: v=%d seq=%d cn=%x inuse=%d\n", bestv, ms->voices[bestv].seqno, ms->voices[bestv].chan_note, ms->voices[bestv].inuse)); #ifdef AUDIO_DEBUG if (ms->voices[bestv].inuse) DPRINTFN(1,("midisyn_allocvoice: steal %x\n", ms->voices[bestv].chan_note)); #endif ms->voices[bestv].chan_note = MS_CHANNOTE(chan, note); ms->voices[bestv].seqno = ms->seqno++; ms->voices[bestv].inuse = 1; return (bestv); } int midisyn_output(addr, b) void *addr; int b; { midisyn *ms = addr; u_int8_t status, chan; int voice = 0; /* initialize to keep gcc quiet */ struct midisyn_methods *fs; u_int32_t note, vel; DPRINTF(("midisyn_output: ms=%p b=0x%02x\n", ms, b)); fs = ms->mets; if (ms->pos < 0) { /* Doing SYSEX */ DPRINTF(("midisyn_output: sysex 0x%02x\n", b)); if (fs->sysex) fs->sysex(ms, b); if (b == MIDI_SYSEX_END) ms->pos = 0; return (0); } if (ms->pos == 0 && !MIDI_IS_STATUS(b)) ms->pos++; /* repeat last status byte */ ms->buf[ms->pos++] = b; status = ms->buf[0]; if (ms->pos < MIDI_LENGTH(status)) return (0); /* Decode the MIDI command */ chan = MIDI_GET_CHAN(status); note = ms->buf[1]; if (ms->flags & MS_FREQXLATE) note = midisyn_note_to_freq(note); vel = ms->buf[2]; switch (MIDI_GET_STATUS(status)) { case MIDI_NOTEOFF: voice = midisyn_findvoice(ms, chan, ms->buf[1]); if (voice >= 0) { fs->noteoff(ms, voice, note, vel); midisyn_freevoice(ms, voice); } break; case MIDI_NOTEON: voice = fs->allocv(ms, chan, ms->buf[1]); fs->noteon(ms, voice, note, vel); break; case MIDI_KEY_PRESSURE: if (fs->keypres) { voice = midisyn_findvoice(ms, voice, ms->buf[1]); if (voice >= 0) fs->keypres(ms, voice, note, vel); } break; case MIDI_CTL_CHANGE: if (fs->ctlchg) fs->ctlchg(ms, chan, ms->buf[1], vel); break; case MIDI_PGM_CHANGE: if (fs->pgmchg) fs->pgmchg(ms, chan, ms->buf[1]); break; case MIDI_CHN_PRESSURE: if (fs->chnpres) { voice = midisyn_findvoice(ms, chan, ms->buf[1]); if (voice >= 0) fs->chnpres(ms, voice, note); } break; case MIDI_PITCH_BEND: if (fs->pitchb) { voice = midisyn_findvoice(ms, chan, ms->buf[1]); if (voice >= 0) fs->pitchb(ms, chan, note, vel); } break; case MIDI_SYSTEM_PREFIX: if (fs->sysex) fs->sysex(ms, status); ms->pos = -1; return (0); } ms->pos = 0; return (0); } /* * Convert a MIDI note to the corresponding frequency. * The frequency is scaled by 2^16. */ u_int32_t midisyn_note_to_freq(note) int note; { int o, n, f; #define BASE_OCTAVE 5 static u_int32_t notes[] = { 17145893, 18165441, 19245614, 20390018, 21602472, 22887021, 24247954, 25689813, 27217409, 28835840, 30550508, 32367136 }; o = note / 12; n = note % 12; f = notes[n]; if (o < BASE_OCTAVE) f >>= (BASE_OCTAVE - o); else if (o > BASE_OCTAVE) f <<= (o - BASE_OCTAVE); return (f); } u_int32_t midisyn_finetune(base_freq, bend, range, vibrato_cents) u_int32_t base_freq; int bend; int range; int vibrato_cents; { static u_int16_t semitone_tuning[24] = { /* 0 */ 10000, 10595, 11225, 11892, 12599, 13348, 14142, 14983, /* 8 */ 15874, 16818, 17818, 18877, 20000, 21189, 22449, 23784, /* 16 */ 25198, 26697, 28284, 29966, 31748, 33636, 35636, 37755 }; static u_int16_t cent_tuning[100] = { /* 0 */ 10000, 10006, 10012, 10017, 10023, 10029, 10035, 10041, /* 8 */ 10046, 10052, 10058, 10064, 10070, 10075, 10081, 10087, /* 16 */ 10093, 10099, 10105, 10110, 10116, 10122, 10128, 10134, /* 24 */ 10140, 10145, 10151, 10157, 10163, 10169, 10175, 10181, /* 32 */ 10187, 10192, 10198, 10204, 10210, 10216, 10222, 10228, /* 40 */ 10234, 10240, 10246, 10251, 10257, 10263, 10269, 10275, /* 48 */ 10281, 10287, 10293, 10299, 10305, 10311, 10317, 10323, /* 56 */ 10329, 10335, 10341, 10347, 10353, 10359, 10365, 10371, /* 64 */ 10377, 10383, 10389, 10395, 10401, 10407, 10413, 10419, /* 72 */ 10425, 10431, 10437, 10443, 10449, 10455, 10461, 10467, /* 80 */ 10473, 10479, 10485, 10491, 10497, 10503, 10509, 10515, /* 88 */ 10521, 10528, 10534, 10540, 10546, 10552, 10558, 10564, /* 96 */ 10570, 10576, 10582, 10589 }; u_int32_t amount; int negative, semitones, cents, multiplier; if (range == 0) return base_freq; if (base_freq == 0) return base_freq; if (range >= 8192) range = 8192; bend = bend * range / 8192; bend += vibrato_cents; if (bend == 0) return base_freq; if (bend < 0) { bend = -bend; negative = 1; } else negative = 0; if (bend > range) bend = range; multiplier = 1; while (bend > 2399) { multiplier *= 4; bend -= 2400; } semitones = bend / 100; if (semitones > 23) semitones = 23; cents = bend % 100; amount = semitone_tuning[semitones] * multiplier * cent_tuning[cents] / 10000; if (negative) return (base_freq * 10000 / amount); /* Bend down */ else return (base_freq * amount / 10000); /* Bend up */ }