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kernel/linux-imx6_3.14.28/include/sound/seq_virmidi.h 2.69 KB
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  #ifndef __SOUND_SEQ_VIRMIDI_H
  #define __SOUND_SEQ_VIRMIDI_H
  
  /*
   *  Virtual Raw MIDI client on Sequencer
   *  Copyright (c) 2000 by Takashi Iwai <tiwai@suse.de>,
   *                        Jaroslav Kysela <perex@perex.cz>
   *
   *   This program is free software; you can redistribute it and/or modify
   *   it under the terms of the GNU General Public License as published by
   *   the Free Software Foundation; either version 2 of the License, or
   *   (at your option) any later version.
   *
   *   This program is distributed in the hope that it will be useful,
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *   GNU General Public License for more details.
   *
   *   You should have received a copy of the GNU General Public License
   *   along with this program; if not, write to the Free Software
   *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   *
   */
  
  #include <sound/rawmidi.h>
  #include <sound/seq_midi_event.h>
  
  /*
   * device file instance:
   * This instance is created at each time the midi device file is
   * opened.  Each instance has its own input buffer and MIDI parser
   * (buffer), and is associated with the device instance.
   */
  struct snd_virmidi {
  	struct list_head list;
  	int seq_mode;
  	int client;
  	int port;
  	unsigned int trigger: 1;
  	struct snd_midi_event *parser;
  	struct snd_seq_event event;
  	struct snd_virmidi_dev *rdev;
  	struct snd_rawmidi_substream *substream;
  };
  
  #define SNDRV_VIRMIDI_SUBSCRIBE		(1<<0)
  #define SNDRV_VIRMIDI_USE		(1<<1)
  
  /*
   * device record:
   * Each virtual midi device has one device instance.  It contains
   * common information and the linked-list of opened files, 
   */
  struct snd_virmidi_dev {
  	struct snd_card *card;		/* associated card */
  	struct snd_rawmidi *rmidi;		/* rawmidi device */
  	int seq_mode;			/* SNDRV_VIRMIDI_XXX */
  	int device;			/* sequencer device */
  	int client;			/* created/attached client */
  	int port;			/* created/attached port */
  	unsigned int flags;		/* SNDRV_VIRMIDI_* */
  	rwlock_t filelist_lock;
  	struct list_head filelist;
  };
  
  /* sequencer mode:
   * ATTACH = input/output events from midi device are routed to the
   *          attached sequencer port.  sequencer port is not created
   *          by virmidi itself.
   *          the input to rawmidi must be processed by passing the
   *          incoming events via snd_virmidi_receive()
   * DISPATCH = input/output events are routed to subscribers.
   *            sequencer port is created in virmidi.
   */
  #define SNDRV_VIRMIDI_SEQ_NONE		0
  #define SNDRV_VIRMIDI_SEQ_ATTACH	1
  #define SNDRV_VIRMIDI_SEQ_DISPATCH	2
  
  int snd_virmidi_new(struct snd_card *card, int device, struct snd_rawmidi **rrmidi);
  
  #endif /* __SOUND_SEQ_VIRMIDI */