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ef965ad5a7
snd_midi_event_encode_byte() can never fail, and it can return rather true/false. Change the return type to bool, adjust the argument to receive a MIDI byte as unsigned char, and adjust the comment accordingly. This allows callers to drop error checks, which simplifies the code. Meanwhile, snd_midi_event_encode() helper is used only in seq_midi.c, and it can be better folded into it. This will reduce the total amount of lines in the end. Signed-off-by: Takashi Iwai <tiwai@suse.de>
53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
#ifndef __SOUND_SEQ_MIDI_EVENT_H
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#define __SOUND_SEQ_MIDI_EVENT_H
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/*
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* MIDI byte <-> sequencer event coder
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*
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* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
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* Jaroslav Kysela <perex@perex.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <sound/asequencer.h>
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#define MAX_MIDI_EVENT_BUF 256
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/* midi status */
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struct snd_midi_event {
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int qlen; /* queue length */
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int read; /* chars read */
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int type; /* current event type */
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unsigned char lastcmd; /* last command (for MIDI state handling) */
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unsigned char nostat; /* no state flag */
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int bufsize; /* allocated buffer size */
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unsigned char *buf; /* input buffer */
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spinlock_t lock;
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};
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int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev);
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void snd_midi_event_free(struct snd_midi_event *dev);
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void snd_midi_event_reset_encode(struct snd_midi_event *dev);
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void snd_midi_event_reset_decode(struct snd_midi_event *dev);
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void snd_midi_event_no_status(struct snd_midi_event *dev, int on);
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bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
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struct snd_seq_event *ev);
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/* decode from event to bytes - return number of written bytes if success */
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long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
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struct snd_seq_event *ev);
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#endif /* __SOUND_SEQ_MIDI_EVENT_H */
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