alsa-lib/include/seq_event.h

/**
 * \file include/seq_event.h
 * \brief Application interface library for the ALSA driver
 * \author Jaroslav Kysela <perex@perex.cz>
 * \author Abramo Bagnara <abramo@alsa-project.org>
 * \author Takashi Iwai <tiwai@suse.de>
 * \date 1998-2001
 *
 * Application interface library for the ALSA driver
 */
/*
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as
 *   published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#ifndef __ALSA_SEQ_EVENT_H
#define __ALSA_SEQ_EVENT_H

/**
 *  \defgroup SeqEvents Sequencer Event Definitions
 *  Sequencer Event Definitions
 *  \ingroup Sequencer
 *  \{
 */

/**
 * Sequencer event data type
 */
typedef unsigned char snd_seq_event_type_t;

/** Sequencer event type */
enum snd_seq_event_type {
	/** system status; event data type = #snd_seq_result_t */
	SND_SEQ_EVENT_SYSTEM = 0,
	/** returned result status; event data type = #snd_seq_result_t */
	SND_SEQ_EVENT_RESULT,

	/** note on and off with duration; event data type = #snd_seq_ev_note_t */
	SND_SEQ_EVENT_NOTE = 5,
	/** note on; event data type = #snd_seq_ev_note_t */
	SND_SEQ_EVENT_NOTEON,
	/** note off; event data type = #snd_seq_ev_note_t */
	SND_SEQ_EVENT_NOTEOFF,
	/** key pressure change (aftertouch); event data type = #snd_seq_ev_note_t */
	SND_SEQ_EVENT_KEYPRESS,
	
	/** controller; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_CONTROLLER = 10,
	/** program change; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_PGMCHANGE,
	/** channel pressure; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_CHANPRESS,
	/** pitchwheel; event data type = #snd_seq_ev_ctrl_t; data is from -8192 to 8191) */
	SND_SEQ_EVENT_PITCHBEND,
	/** 14 bit controller value; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_CONTROL14,
	/** 14 bit NRPN;  event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_NONREGPARAM,
	/** 14 bit RPN; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_REGPARAM,

	/** SPP with LSB and MSB values; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_SONGPOS = 20,
	/** Song Select with song ID number; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_SONGSEL,
	/** midi time code quarter frame; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_QFRAME,
	/** SMF Time Signature event; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_TIMESIGN,
	/** SMF Key Signature event; event data type = #snd_seq_ev_ctrl_t */
	SND_SEQ_EVENT_KEYSIGN,
	        
	/** MIDI Real Time Start message; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_START = 30,
	/** MIDI Real Time Continue message; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_CONTINUE,
	/** MIDI Real Time Stop message; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_STOP,
	/** Set tick queue position; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_SETPOS_TICK,
	/** Set real-time queue position; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_SETPOS_TIME,
	/** (SMF) Tempo event; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_TEMPO,
	/** MIDI Real Time Clock message; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_CLOCK,
	/** MIDI Real Time Tick message; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_TICK,
	/** Queue timer skew; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_QUEUE_SKEW,
	/** Sync position changed; event data type = #snd_seq_ev_queue_control_t */
	SND_SEQ_EVENT_SYNC_POS,

	/** Tune request; event data type = none */
	SND_SEQ_EVENT_TUNE_REQUEST = 40,
	/** Reset to power-on state; event data type = none */
	SND_SEQ_EVENT_RESET,
	/** Active sensing event; event data type = none */
	SND_SEQ_EVENT_SENSING,

	/** Echo-back event; event data type = any type */
	SND_SEQ_EVENT_ECHO = 50,
	/** OSS emulation raw event; event data type = any type */
	SND_SEQ_EVENT_OSS,

	/** New client has connected; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_CLIENT_START = 60,
	/** Client has left the system; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_CLIENT_EXIT,
	/** Client status/info has changed; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_CLIENT_CHANGE,
	/** New port was created; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_PORT_START,
	/** Port was deleted from system; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_PORT_EXIT,
	/** Port status/info has changed; event data type = #snd_seq_addr_t */
	SND_SEQ_EVENT_PORT_CHANGE,

	/** Ports connected; event data type = #snd_seq_connect_t */
	SND_SEQ_EVENT_PORT_SUBSCRIBED,
	/** Ports disconnected; event data type = #snd_seq_connect_t */
	SND_SEQ_EVENT_PORT_UNSUBSCRIBED,

	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR0 = 90,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR1,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR2,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR3,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR4,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR5,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR6,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR7,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR8,
	/** user-defined event; event data type = any (fixed size) */
	SND_SEQ_EVENT_USR9,

	/** system exclusive data (variable length);  event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_SYSEX = 130,
	/** error event;  event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_BOUNCE,
	/** reserved for user apps;  event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_USR_VAR0 = 135,
	/** reserved for user apps; event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_USR_VAR1,
	/** reserved for user apps; event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_USR_VAR2,
	/** reserved for user apps; event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_USR_VAR3,
	/** reserved for user apps; event data type = #snd_seq_ev_ext_t */
	SND_SEQ_EVENT_USR_VAR4,

	/** NOP; ignored in any case */
	SND_SEQ_EVENT_NONE = 255
};


/** Sequencer event address */
typedef struct snd_seq_addr {
	unsigned char client;	/**< Client id */
	unsigned char port;	/**< Port id */
} snd_seq_addr_t;

/** Connection (subscription) between ports */
typedef struct snd_seq_connect {
	snd_seq_addr_t sender;	/**< sender address */
	snd_seq_addr_t dest;	/**< destination address */
} snd_seq_connect_t;


/** Real-time data record */
typedef struct snd_seq_real_time {
	unsigned int tv_sec;		/**< seconds */
	unsigned int tv_nsec;		/**< nanoseconds */
} snd_seq_real_time_t;

/** (MIDI) Tick-time data record */
typedef unsigned int snd_seq_tick_time_t;

/** unioned time stamp */
typedef union snd_seq_timestamp {
	snd_seq_tick_time_t tick;	/**< tick-time */
	struct snd_seq_real_time time;	/**< real-time */
} snd_seq_timestamp_t;


/**
 * Event mode flags
 *
 * NOTE: only 8 bits available!
 */
#define SND_SEQ_TIME_STAMP_TICK		(0<<0)	/**< timestamp in clock ticks */
#define SND_SEQ_TIME_STAMP_REAL		(1<<0)	/**< timestamp in real time */
#define SND_SEQ_TIME_STAMP_MASK		(1<<0)	/**< mask for timestamp bits */

#define SND_SEQ_TIME_MODE_ABS		(0<<1)	/**< absolute timestamp */
#define SND_SEQ_TIME_MODE_REL		(1<<1)	/**< relative to current time */
#define SND_SEQ_TIME_MODE_MASK		(1<<1)	/**< mask for time mode bits */

#define SND_SEQ_EVENT_LENGTH_FIXED	(0<<2)	/**< fixed event size */
#define SND_SEQ_EVENT_LENGTH_VARIABLE	(1<<2)	/**< variable event size */
#define SND_SEQ_EVENT_LENGTH_VARUSR	(2<<2)	/**< variable event size - user memory space */
#define SND_SEQ_EVENT_LENGTH_MASK	(3<<2)	/**< mask for event length bits */

#define SND_SEQ_PRIORITY_NORMAL		(0<<4)	/**< normal priority */
#define SND_SEQ_PRIORITY_HIGH		(1<<4)	/**< event should be processed before others */
#define SND_SEQ_PRIORITY_MASK		(1<<4)	/**< mask for priority bits */


/** Note event */
typedef struct snd_seq_ev_note {
	unsigned char channel;		/**< channel number */
	unsigned char note;		/**< note */
	unsigned char velocity;		/**< velocity */
	unsigned char off_velocity;	/**< note-off velocity; only for #SND_SEQ_EVENT_NOTE */
	unsigned int duration;		/**< duration until note-off; only for #SND_SEQ_EVENT_NOTE */
} snd_seq_ev_note_t;

/** Controller event */
typedef struct snd_seq_ev_ctrl {
	unsigned char channel;		/**< channel number */
	unsigned char unused[3];	/**< reserved */
	unsigned int param;		/**< control parameter */
	signed int value;		/**< control value */
} snd_seq_ev_ctrl_t;

/** generic set of bytes (12x8 bit) */
typedef struct snd_seq_ev_raw8 {
	unsigned char d[12];		/**< 8 bit value */
} snd_seq_ev_raw8_t;

/** generic set of integers (3x32 bit) */
typedef struct snd_seq_ev_raw32 {
	unsigned int d[3];		/**< 32 bit value */
} snd_seq_ev_raw32_t;

/** external stored data */
struct snd_seq_ev_ext {
	unsigned int len;		/**< length of data */
	void *ptr;			/**< pointer to data (note: can be 64-bit) */
} __attribute__((packed));
/** external stored data */
typedef struct snd_seq_ev_ext snd_seq_ev_ext_t;
#ifdef DOC_HIDDEN
/* redefine typedef for stupid doxygen */
typedef snd_seq_ev_ext snd_seq_ev_ext_t;
#endif

/** Result events */
typedef struct snd_seq_result {
	int event;		/**< processed event type */
	int result;		/**< status */
} snd_seq_result_t;

/** Queue skew values */
typedef struct snd_seq_queue_skew {
	unsigned int value;	/**< skew value */
	unsigned int base;	/**< skew base */
} snd_seq_queue_skew_t;

/** queue timer control */
typedef struct snd_seq_ev_queue_control {
	unsigned char queue;			/**< affected queue */
	unsigned char unused[3];		/**< reserved */
	union {
		signed int value;		/**< affected value (e.g. tempo) */
		snd_seq_timestamp_t time;	/**< time */
		unsigned int position;		/**< sync position */
		snd_seq_queue_skew_t skew;	/**< queue skew */
		unsigned int d32[2];		/**< any data */
		unsigned char d8[8];		/**< any data */
	} param;				/**< data value union */
} snd_seq_ev_queue_control_t;


/** Sequencer event */
typedef struct snd_seq_event {
	snd_seq_event_type_t type;	/**< event type */
	unsigned char flags;		/**< event flags */
	unsigned char tag;		/**< tag */
	
	unsigned char queue;		/**< schedule queue */
	snd_seq_timestamp_t time;	/**< schedule time */

	snd_seq_addr_t source;		/**< source address */
	snd_seq_addr_t dest;		/**< destination address */

	union {
		snd_seq_ev_note_t note;		/**< note information */
		snd_seq_ev_ctrl_t control;	/**< MIDI control information */
		snd_seq_ev_raw8_t raw8;		/**< raw8 data */
		snd_seq_ev_raw32_t raw32;	/**< raw32 data */
		snd_seq_ev_ext_t ext;		/**< external data */
		snd_seq_ev_queue_control_t queue; /**< queue control */
		snd_seq_timestamp_t time;	/**< timestamp */
		snd_seq_addr_t addr;		/**< address */
		snd_seq_connect_t connect;	/**< connect information */
		snd_seq_result_t result;	/**< operation result code */
	} data;				/**< event data... */
} snd_seq_event_t;


/** \} */

#endif /* __ALSA_SEQ_EVENT_H */