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/* $OpenBSD: midi.h,v 1.15 2021/11/01 14:43:25 ratchov Exp $ */
/*
* Copyright (c) 2008-2012 Alexandre Ratchov <alex@caoua.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef MIDI_H
#define MIDI_H
#include "abuf.h"
#include "miofile.h"
/*
* masks to extract command and channel of status byte
*/
#define MIDI_CMDMASK 0xf0
#define MIDI_CHANMASK 0x0f
/*
* MIDI status bytes of voice messages
*/
#define MIDI_NOFF 0x80 /* note off */
#define MIDI_NON 0x90 /* note on */
#define MIDI_KAT 0xa0 /* key after touch */
#define MIDI_CTL 0xb0 /* controller */
#define MIDI_PC 0xc0 /* program change */
#define MIDI_CAT 0xd0 /* channel after touch */
#define MIDI_BEND 0xe0 /* pitch bend */
#define MIDI_ACK 0xfe /* active sensing message */
/*
* MIDI controller numbers
*/
#define MIDI_CTL_VOL 7 /* volume */
/*
* Max coarse value
*/
#define MIDI_MAXCTL 127
/*
* midi stream state structure
*/
struct midiops
{
void (*imsg)(void *, unsigned char *, int);
void (*omsg)(void *, unsigned char *, int);
void (*fill)(void *, int);
void (*exit)(void *);
};
struct midi {
struct midiops *ops; /* port/sock/dev callbacks */
struct midi *owner; /* current writer stream */
unsigned int mode; /* MODE_{MIDIIN,MIDIOUT} */
void *arg; /* user data for callbacks */
#define MIDI_MSGMAX 16 /* max size of MIDI msg */
unsigned char msg[MIDI_MSGMAX]; /* parsed input message */
unsigned int st; /* input MIDI running status */
unsigned int last_st; /* backup of st during sysex */
unsigned int used; /* bytes used in ``msg'' */
unsigned int idx; /* current ``msg'' size */
unsigned int len; /* expected ``msg'' length */
unsigned int txmask; /* list of ep we send to */
unsigned int self; /* equal (1 << index) */
int tickets; /* max bytes we can process */
struct abuf obuf; /* output buffer */
};
/*
* midi port
*/
struct port {
struct port *next;
struct port_mio mio;
#define PORT_CFG 0
#define PORT_INIT 1
#define PORT_DRAIN 2
unsigned int state;
unsigned int num; /* port serial number */
char *path;
struct port *alt_next;
int hold; /* hold the port open ? */
struct midi *midi;
};
/*
* midi control ports
*/
extern struct port *port_list;
void midi_init(void);
void midi_done(void);
struct midi *midi_new(struct midiops *, void *, int);
void midi_del(struct midi *);
void midi_log(struct midi *);
void midi_tickets(struct midi *);
void midi_in(struct midi *, unsigned char *, int);
void midi_out(struct midi *, unsigned char *, int);
void midi_send(struct midi *, unsigned char *, int);
void midi_fill(struct midi *);
void midi_tag(struct midi *, unsigned int);
unsigned int midi_tags(struct midi *);
void midi_link(struct midi *, struct midi *);
void midi_abort(struct midi *);
void midi_migrate(struct midi *, struct midi *);
void port_log(struct port *);
struct port *port_new(char *, unsigned int, int);
struct port *port_bynum(int);
void port_del(struct port *);
int port_ref(struct port *);
void port_unref(struct port *);
int port_init(struct port *);
void port_done(struct port *);
void port_drain(struct port *);
int port_close(struct port *);
struct port *port_alt_ref(int);
struct port *port_migrate(struct port *);
#endif /* !defined(MIDI_H) */
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