mirror of https://github.com/ericonr/sndio.git
470 lines
8.5 KiB
C
470 lines
8.5 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* TODO
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*
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* use shadow variables (to save NRPNs, LSB of controller)
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* in the midi merger
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "abuf.h"
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#include "defs.h"
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#include "dev.h"
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#include "file.h"
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#include "midi.h"
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#include "miofile.h"
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#include "sysex.h"
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#include "utils.h"
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#include "bsd-compat.h"
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/*
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* input data rate is XFER / TIMO (in bytes per microsecond),
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* it must be slightly larger than the MIDI standard 3125 bytes/s
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*/
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#define MIDI_XFER 340
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#define MIDI_TIMO 100000
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int port_open(struct port *);
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void port_imsg(void *, unsigned char *, int);
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void port_omsg(void *, unsigned char *, int);
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void port_exit(void *);
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struct midiops port_midiops = {
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port_imsg,
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port_omsg,
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port_exit
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};
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#define MIDI_NEP 32
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struct midi midi_ep[MIDI_NEP];
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struct timo midi_timo;
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struct port *port_list = NULL;
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unsigned int midi_portnum = 0;
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struct midithru {
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unsigned txmask;
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#define MIDITHRU_NMAX 32
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} midithru[MIDITHRU_NMAX];
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/*
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* length of voice and common messages (status byte included)
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*/
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unsigned int voice_len[] = { 3, 3, 3, 3, 2, 2, 3 };
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unsigned int common_len[] = { 0, 2, 3, 2, 0, 0, 1, 1 };
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void
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midi_log(struct midi *ep)
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{
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log_puts("midi");
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log_putu(ep - midi_ep);
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}
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void
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midi_ontimo(void *arg)
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{
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int i;
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struct midi *ep;
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for (i = MIDI_NEP, ep = midi_ep; i > 0; i--, ep++)
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ep->tickets = MIDI_XFER;
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timo_add(&midi_timo, MIDI_TIMO);
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}
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void
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midi_init(void)
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{
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timo_set(&midi_timo, midi_ontimo, NULL);
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timo_add(&midi_timo, MIDI_TIMO);
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}
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void
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midi_done(void)
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{
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timo_del(&midi_timo);
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}
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struct midi *
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midi_new(struct midiops *ops, void *arg, int mode)
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{
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int i;
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struct midi *ep;
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for (i = 0, ep = midi_ep;; i++, ep++) {
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if (i == MIDI_NEP)
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return NULL;
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if (ep->ops == NULL)
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break;
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}
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ep->ops = ops;
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ep->arg = arg;
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ep->used = 0;
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ep->len = 0;
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ep->idx = 0;
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ep->st = 0;
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ep->txmask = 0;
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ep->rxmask = 1 << i;
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ep->tickets = MIDI_XFER;
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ep->mode = mode;
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/*
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* client output is our input (ibuf) and our output (obuf) goes
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* to client input
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*/
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if (ep->mode & MODE_MIDIOUT) {
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abuf_init(&ep->ibuf, MIDI_BUFSZ, 1);
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}
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if (ep->mode & MODE_MIDIIN) {
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abuf_init(&ep->obuf, MIDI_BUFSZ, 1);
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}
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return ep;
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}
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void
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midi_del(struct midi *ep)
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{
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int i;
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for (i = 0; i < MIDI_NEP; i++)
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midi_ep[i].txmask &= ~ep->rxmask;
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for (i = 0; i < MIDITHRU_NMAX; i++)
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midithru[i].txmask &= ~ep->rxmask;
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/* XXX: drain output */
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ep->ops = NULL;
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if (ep->mode & MODE_MIDIOUT) {
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abuf_done(&ep->ibuf);
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}
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if (ep->mode & MODE_MIDIIN) {
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abuf_done(&ep->obuf);
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}
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}
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void
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midi_tag(struct midi *ep, unsigned int tag)
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{
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int i;
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struct midi *m;
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unsigned members;
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members = midithru[tag].txmask;
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midithru[tag].txmask |= ep->rxmask;
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for (i = 0, m = midi_ep; i < MIDI_NEP; i++, m++) {
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if (!(members & (1 << i)))
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continue;
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if (ep->mode & MODE_MIDIOUT)
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ep->txmask |= m->rxmask;
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if (ep->mode & MODE_MIDIIN)
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m->txmask |= ep->rxmask;
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}
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}
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void
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midi_untag(struct midi *ep, unsigned int tag)
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{
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int i;
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struct midi *m;
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unsigned members;
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members = midithru[tag].txmask;
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midithru[tag].txmask &= ~ep->rxmask;
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for (i = 0, m = midi_ep;; i++, m++) {
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if (!(members & (1 << i)))
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continue;
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ep->txmask &= ~m->rxmask;
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m->txmask &= ~ep->rxmask;
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}
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}
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void
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midi_send(struct midi *iep, unsigned char *msg, int size)
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{
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struct midi *oep;
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int i;
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#ifdef DEBUG
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if (log_level >= 4) {
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midi_log(iep);
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log_puts(": sending:");
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for (i = 0; i < size; i++) {
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log_puts(" ");
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log_putx(msg[i]);
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}
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log_puts("\n");
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}
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#endif
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for (i = 0; i < MIDI_NEP ; i++) {
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if ((iep->txmask & (1 << i)) == 0)
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continue;
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oep = midi_ep + i;
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if (msg[0] <= 0x7f) {
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if (oep->owner != iep)
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continue;
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} else if (msg[0] <= 0xf7)
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oep->owner = iep;
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#ifdef DEBUG
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if (log_level >= 4) {
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midi_log(iep);
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log_puts(" -> ");
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midi_log(oep);
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log_puts("\n");
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}
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#endif
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oep->ops->omsg(oep->arg, msg, size);
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}
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}
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int
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midi_in(struct midi *ep)
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{
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unsigned char c, *idata;
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unsigned int i, icount;
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if (ep->ibuf.used == 0)
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return 0;
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if (ep->tickets == 0) {
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#ifdef DEBUG
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if (log_level >= 4) {
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midi_log(ep);
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log_puts(": out of tickets, blocking\n");
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}
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#endif
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return 0;
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}
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idata = abuf_rgetblk(&ep->ibuf, &icount);
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if (icount > ep->tickets)
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icount = ep->tickets;
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//ep->tickets -= icount;
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#ifdef DEBUG
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if (log_level >= 4) {
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midi_log(ep);
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log_puts(": in:");
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for (i = 0; i < icount; i++) {
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log_puts(" ");
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log_putx(idata[i]);
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}
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log_puts("\n");
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}
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#endif
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for (i = 0; i < icount; i++) {
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c = *idata++;
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if (c >= 0xf8) {
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if (c != MIDI_ACK)
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ep->ops->imsg(ep->arg, &c, 1);
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} else if (c == SYSEX_END) {
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if (ep->st == SYSEX_START) {
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ep->msg[ep->idx++] = c;
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ep->ops->imsg(ep->arg, ep->msg, ep->idx);
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}
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ep->st = 0;
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ep->idx = 0;
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} else if (c >= 0xf0) {
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ep->msg[0] = c;
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ep->len = common_len[c & 7];
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ep->st = c;
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ep->idx = 1;
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} else if (c >= 0x80) {
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ep->msg[0] = c;
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ep->len = voice_len[(c >> 4) & 7];
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ep->st = c;
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ep->idx = 1;
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} else if (ep->st) {
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if (ep->idx == 0 &&
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ep->st != SYSEX_START) {
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ep->msg[ep->idx++] =
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ep->st;
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}
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ep->msg[ep->idx++] = c;
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if (ep->idx == ep->len) {
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ep->ops->imsg(ep->arg, ep->msg, ep->idx);
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if (ep->st >= 0xf0)
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ep->st = 0;
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ep->idx = 0;
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} else if (ep->idx == MIDI_MSGMAX) {
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/* sysex continued */
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ep->ops->imsg(ep->arg, ep->msg, ep->idx);
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ep->idx = 0;
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}
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}
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}
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abuf_rdiscard(&ep->ibuf, icount);
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return 1;
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}
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void
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midi_out(struct midi *oep, unsigned char *idata, int icount)
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{
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unsigned char *odata;
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unsigned ocount;
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while (icount > 0) {
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if (oep->obuf.used == oep->obuf.len) {
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#ifdef DEBUG
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if (log_level >= 3) {
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midi_log(oep);
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log_puts(": overrun, discarding ");
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log_putu(oep->obuf.used);
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log_puts(" bytes\n");
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}
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#endif
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abuf_rdiscard(&oep->obuf, oep->obuf.used);
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oep->owner = NULL;
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return;
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}
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odata = abuf_wgetblk(&oep->obuf, &ocount);
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if (ocount > icount)
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ocount = icount;
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#ifdef DEBUG
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if (log_level >= 4) {
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midi_log(oep);
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log_puts(": stored ");
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log_putu(ocount);
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log_puts(" bytes\n");
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}
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#endif
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memcpy(odata, idata, ocount);
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abuf_wcommit(&oep->obuf, ocount);
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icount -= ocount;
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idata += ocount;
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}
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}
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#ifdef DEBUG
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void
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port_log(struct port *p)
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{
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log_puts(p->path);
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}
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#endif
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void
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port_imsg(void *arg, unsigned char *msg, int size)
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{
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struct port *p = arg;
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midi_send(p->midi, msg, size);
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}
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void
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port_omsg(void *arg, unsigned char *msg, int size)
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{
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struct port *p = arg;
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int i;
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#ifdef DEBUG
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if (log_level >= 4) {
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port_log(p);
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log_puts(": sending:");
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for (i = 0; i < size; i++) {
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log_puts(" ");
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log_putx(msg[i]);
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}
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log_puts("\n");
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}
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#endif
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midi_out(p->midi, msg, size);
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}
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void
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port_exit(void *arg)
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{
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struct port *p = arg;
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#ifdef DEBUG
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if (log_level >= 3) {
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port_log(p);
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log_puts(": exit\n");
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}
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#endif
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}
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/*
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* Add a MIDI port to the device
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*/
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struct port *
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port_new(char *path, unsigned int mode)
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{
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struct port *c;
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c = xmalloc(sizeof(struct port));
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c->path = path;
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c->state = PORT_CFG;
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c->midi = midi_new(&port_midiops, c, mode);
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midi_portnum++;
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c->next = port_list;
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port_list = c;
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return c;
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}
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void
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port_del(struct port *c)
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{
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struct port **p;
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if (c->state != PORT_CFG)
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port_close(c);
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for (p = &port_list; *p != c; p = &(*p)->next) {
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#ifdef DEBUG
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if (*p == NULL) {
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log_puts("port to delete not on the list\n");
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panic();
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}
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#endif
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}
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*p = c->next;
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free(c);
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}
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/*
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* Open a MIDI device and connect it to the thru box
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*/
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int
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port_open(struct port *c)
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{
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c->mio = miofile_new(c);
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if (c->mio == NULL)
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return 0;
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c->state = PORT_INIT;
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return 1;
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}
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int
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port_close(struct port *c)
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{
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miofile_del(c->mio);
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c->mio = NULL;
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c->state = PORT_CFG;
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return 1;
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}
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int
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port_init(struct port *c)
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{
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return port_open(c);
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}
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void
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port_done(struct port *c)
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{
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/* XXX: drain */
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port_close(c);
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}
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