mirror of https://github.com/ericonr/sndio.git
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/* $OpenBSD$ */
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/*
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* Copyright (c) 2008-2012 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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#ifndef MIDI_H
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#define MIDI_H
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#include "abuf.h"
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#include "miofile.h"
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/*
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* masks to extract command and channel of status byte
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*/
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#define MIDI_CMDMASK 0xf0
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#define MIDI_CHANMASK 0x0f
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/*
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* MIDI status bytes of voice messages
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*/
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#define MIDI_NOFF 0x80 /* note off */
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#define MIDI_NON 0x90 /* note on */
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#define MIDI_KAT 0xa0 /* key after touch */
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#define MIDI_CTL 0xb0 /* controller */
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#define MIDI_PC 0xc0 /* program change */
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#define MIDI_CAT 0xd0 /* channel after touch */
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#define MIDI_BEND 0xe0 /* pitch bend */
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#define MIDI_ACK 0xfe /* active sensing message */
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/*
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* MIDI controller numbers
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*/
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#define MIDI_CTL_VOL 7 /* volume */
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/*
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* Max coarse value
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*/
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#define MIDI_MAXCTL 127
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/*
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* midi stream state structure
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*/
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struct midiops
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{
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void (*imsg)(void *, unsigned char *, int);
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void (*omsg)(void *, unsigned char *, int);
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void (*fill)(void *, int);
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void (*exit)(void *);
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};
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struct midi {
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struct midiops *ops; /* port/sock/dev callbacks */
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struct midi *owner; /* current writer stream */
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unsigned int mode; /* MODE_{MIDIIN,MIDIOUT} */
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void *arg; /* user data for callbacks */
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#define MIDI_MSGMAX 16 /* max size of MIDI msg */
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unsigned char msg[MIDI_MSGMAX]; /* parsed input message */
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unsigned int st; /* input MIDI running status */
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unsigned int last_st; /* backup of st during sysex */
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unsigned int used; /* bytes used in ``msg'' */
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unsigned int idx; /* current ``msg'' size */
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unsigned int len; /* expected ``msg'' length */
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unsigned int txmask; /* list of ep we send to */
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unsigned int self; /* equal (1 << index) */
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int tickets; /* max bytes we can process */
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struct abuf obuf; /* output buffer */
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};
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/*
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* midi port
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*/
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struct port {
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struct port *next;
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struct port_mio mio;
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#define PORT_CFG 0
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#define PORT_INIT 1
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#define PORT_DRAIN 2
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unsigned int state;
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unsigned int num; /* port serial number */
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struct name *path_list;
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int hold; /* hold the port open ? */
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struct midi *midi;
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};
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/*
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* midi control ports
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*/
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extern struct port *port_list;
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void midi_init(void);
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void midi_done(void);
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struct midi *midi_new(struct midiops *, void *, int);
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void midi_del(struct midi *);
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void midi_log(struct midi *);
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void midi_tickets(struct midi *);
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void midi_in(struct midi *, unsigned char *, int);
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void midi_out(struct midi *, unsigned char *, int);
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void midi_send(struct midi *, unsigned char *, int);
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void midi_fill(struct midi *);
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void midi_tag(struct midi *, unsigned int);
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unsigned int midi_tags(struct midi *);
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void midi_link(struct midi *, struct midi *);
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void midi_abort(struct midi *);
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void port_log(struct port *);
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struct port *port_new(char *, unsigned int, int);
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struct port *port_bynum(int);
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void port_del(struct port *);
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int port_ref(struct port *);
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void port_unref(struct port *);
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int port_init(struct port *);
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void port_done(struct port *);
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void port_drain(struct port *);
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int port_close(struct port *);
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int port_reopen(struct port *);
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#endif /* !defined(MIDI_H) */
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