annotate plugin/api/alsa/seq_event.h @ 490:c3fb8258e34d

* Make it possible to import an entire session from an RDF document.
  However, at the moment the timings of events appear to be constrained
  by how far the audio decoder has got through its audio file at the
  time the event is queried -- need to investigate.

/* DSSI ALSA compatibility library
 *
 * This library provides for Mac OS X the ALSA snd_seq_event_t handling
 * necessary to compile and run DSSI.  It was extracted from alsa-lib 1.0.8.
 */

/**
 * \file <alsa/seq_event.h>
 * \brief Application interface library for the ALSA driver
 * \author Jaroslav Kysela <[e-mail]>
 * \author Abramo Bagnara <[e-mail]>
 * \author Takashi Iwai <[e-mail]>
 * \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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 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,

	/** Sample select; event data type = #snd_seq_ev_sample_control_t */
	SND_SEQ_EVENT_SAMPLE = 70,
	/** Sample cluster select; event data type = #snd_seq_ev_sample_control_t */
	SND_SEQ_EVENT_SAMPLE_CLUSTER,
	/** voice start */
	SND_SEQ_EVENT_SAMPLE_START,
	/** voice stop */
	SND_SEQ_EVENT_SAMPLE_STOP,
	/** playback frequency */
	SND_SEQ_EVENT_SAMPLE_FREQ,
	/** volume and balance */
	SND_SEQ_EVENT_SAMPLE_VOLUME,
	/** sample loop */
	SND_SEQ_EVENT_SAMPLE_LOOP,
	/** sample position */
	SND_SEQ_EVENT_SAMPLE_POSITION,
	/** private (hardware dependent) event */
	SND_SEQ_EVENT_SAMPLE_PRIVATE1,

	/** 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,

	/** begin of instrument management */
	SND_SEQ_EVENT_INSTR_BEGIN = 100,
	/** end of instrument management */
	SND_SEQ_EVENT_INSTR_END,
	/** query instrument interface info */
	SND_SEQ_EVENT_INSTR_INFO,
	/** result of instrument interface info */
	SND_SEQ_EVENT_INSTR_INFO_RESULT,
	/** query instrument format info */
	SND_SEQ_EVENT_INSTR_FINFO,
	/** result of instrument format info */
	SND_SEQ_EVENT_INSTR_FINFO_RESULT,
	/** reset instrument instrument memory */
	SND_SEQ_EVENT_INSTR_RESET,
	/** get instrument interface status */
	SND_SEQ_EVENT_INSTR_STATUS,
	/** result of instrument interface status */
	SND_SEQ_EVENT_INSTR_STATUS_RESULT,
	/** put an instrument to port */
	SND_SEQ_EVENT_INSTR_PUT,
	/** get an instrument from port */
	SND_SEQ_EVENT_INSTR_GET,
	/** result of instrument query */
	SND_SEQ_EVENT_INSTR_GET_RESULT,
	/** free instrument(s) */
	SND_SEQ_EVENT_INSTR_FREE,
	/** get instrument list */
	SND_SEQ_EVENT_INSTR_LIST,
	/** result of instrument list */
	SND_SEQ_EVENT_INSTR_LIST_RESULT,
	/** set cluster parameters */
	SND_SEQ_EVENT_INSTR_CLUSTER,
	/** get cluster parameters */
	SND_SEQ_EVENT_INSTR_CLUSTER_GET,
	/** result of cluster parameters */
	SND_SEQ_EVENT_INSTR_CLUSTER_RESULT,
	/** instrument change */
	SND_SEQ_EVENT_INSTR_CHANGE,

	/** 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 */
typedef struct snd_seq_ev_ext {
	unsigned int len;		/**< length of data */
	void *ptr;			/**< pointer to data (note: can be 64-bit) */
} __attribute__((packed)) snd_seq_ev_ext_t;

/** Instrument cluster type */
typedef unsigned int snd_seq_instr_cluster_t;

/** Instrument type */
typedef struct snd_seq_instr {
	snd_seq_instr_cluster_t cluster;	/**< cluster id */
	unsigned int std;	/**< instrument standard id; the upper byte means a private instrument (owner - client id) */
	unsigned short bank;	/**< instrument bank id */
	unsigned short prg;	/**< instrument program id */
} snd_seq_instr_t;

/** sample number */
typedef struct snd_seq_ev_sample {
	unsigned int std;	/**< sample standard id */
	unsigned short bank;	/**< sample bank id */
	unsigned short prg;	/**< sample program id */
} snd_seq_ev_sample_t;

/** sample cluster */
typedef struct snd_seq_ev_cluster {
	snd_seq_instr_cluster_t cluster;	/**< cluster id */
} snd_seq_ev_cluster_t;

/** sample position */
typedef unsigned int snd_seq_position_t; /**< playback position (in samples) * 16 */

/** sample stop mode */
typedef enum snd_seq_stop_mode {
	SND_SEQ_SAMPLE_STOP_IMMEDIATELY = 0,	/**< terminate playing immediately */
	SND_SEQ_SAMPLE_STOP_VENVELOPE = 1,	/**< finish volume envelope */
	SND_SEQ_SAMPLE_STOP_LOOP = 2		/**< terminate loop and finish wave */
} snd_seq_stop_mode_t;

/** sample frequency */
typedef int snd_seq_frequency_t; /**< playback frequency in HZ * 16 */

/** sample volume control; if any value is set to -1 == do not change */
typedef struct snd_seq_ev_volume {
	signed short volume;	/**< range: 0-16383 */
	signed short lr;	/**< left-right balance; range: 0-16383 */
	signed short fr;	/**< front-rear balance; range: 0-16383 */
	signed short du;	/**< down-up balance; range: 0-16383 */
} snd_seq_ev_volume_t;

/** simple loop redefinition */
typedef struct snd_seq_ev_loop {
	unsigned int start;	/**< loop start (in samples) * 16 */
	unsigned int end;	/**< loop end (in samples) * 16 */
} snd_seq_ev_loop_t;

/** Sample control events */
typedef struct snd_seq_ev_sample_control {
	unsigned char channel;		/**< channel */
	unsigned char unused[3];	/**< reserved */
	union {
		snd_seq_ev_sample_t sample;	/**< sample number */
		snd_seq_ev_cluster_t cluster;	/**< cluster number */
		snd_seq_position_t position;	/**< position */
		snd_seq_stop_mode_t stop_mode;	/**< stop mode */
		snd_seq_frequency_t frequency;	/**< frequency */
		snd_seq_ev_volume_t volume;	/**< volume */
		snd_seq_ev_loop_t loop;		/**< loop control */
		unsigned char raw8[8];		/**< raw 8-bit */
	} param;		/**< control parameters */
} snd_seq_ev_sample_control_t;



/** INSTR_BEGIN event */
typedef struct snd_seq_ev_instr_begin {
	int timeout;		/**< zero = forever, otherwise timeout in ms */
} snd_seq_ev_instr_begin_t;

/** 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 */
		snd_seq_ev_instr_begin_t instr_begin; /**< instrument */
		snd_seq_ev_sample_control_t sample; /**< sample control */
	} data;				/**< event data... */
} snd_seq_event_t;


/** \} */

#endif /* __ALSA_SEQ_EVENT_H */