include/sound/seq_midi_event.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 #ifndef __SOUND_SEQ_MIDI_EVENT_H
0003 #define __SOUND_SEQ_MIDI_EVENT_H
0004
0005 /*
0006  *  MIDI byte <-> sequencer event coder
0007  *
0008  *  Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
0009  *                        Jaroslav Kysela <perex@perex.cz>
0010  */
0011
0012 #include <sound/asequencer.h>
0013
0014 #define MAX_MIDI_EVENT_BUF  256
0015
0016 /* midi status */
0017 struct snd_midi_event {
0018     int qlen;       /* queue length */
0019     int read;       /* chars read */
0020     int type;       /* current event type */
0021     unsigned char lastcmd;  /* last command (for MIDI state handling) */
0022     unsigned char nostat;   /* no state flag */
0023     int bufsize;        /* allocated buffer size */
0024     unsigned char *buf; /* input buffer */
0025     spinlock_t lock;
0026 };
0027
0028 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev);
0029 void snd_midi_event_free(struct snd_midi_event *dev);
0030 void snd_midi_event_reset_encode(struct snd_midi_event *dev);
0031 void snd_midi_event_reset_decode(struct snd_midi_event *dev);
0032 void snd_midi_event_no_status(struct snd_midi_event *dev, int on);
0033 bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
0034                 struct snd_seq_event *ev);
0035 /* decode from event to bytes - return number of written bytes if success */
0036 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
0037                struct snd_seq_event *ev);
0038
0039 #endif /* __SOUND_SEQ_MIDI_EVENT_H */