include/sound/seq_midi_event.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __SOUND_SEQ_MIDI_EVENT_H
   3 #define __SOUND_SEQ_MIDI_EVENT_H
   4
   5 /*
   6  *  MIDI byte <-> sequencer event coder
   7  *
   8  *  Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
   9  *                        Jaroslav Kysela <perex@perex.cz>
  10  */
  11
  12 #include <sound/asequencer.h>
  13
  14 #define MAX_MIDI_EVENT_BUF      256
  15
  16 /* midi status */
  17 struct snd_midi_event {
  18         int qlen;               /* queue length */
  19         int read;               /* chars read */
  20         int type;               /* current event type */
  21         unsigned char lastcmd;  /* last command (for MIDI state handling) */
  22         unsigned char nostat;   /* no state flag */
  23         int bufsize;            /* allocated buffer size */
  24         unsigned char *buf;     /* input buffer */
  25         spinlock_t lock;
  26 };
  27
  28 int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev);
  29 void snd_midi_event_free(struct snd_midi_event *dev);
  30 void snd_midi_event_reset_encode(struct snd_midi_event *dev);
  31 void snd_midi_event_reset_decode(struct snd_midi_event *dev);
  32 void snd_midi_event_no_status(struct snd_midi_event *dev, int on);
  33 bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
  34                                 struct snd_seq_event *ev);
  35 /* decode from event to bytes - return number of written bytes if success */
  36 long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
  37                            struct snd_seq_event *ev);
  38
  39 #endif /* __SOUND_SEQ_MIDI_EVENT_H */