linux/sound/core/seq/seq_midi_event.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  MIDI byte <-> sequencer event coder
 *
 *  Copyright (C) 1998,99 Takashi Iwai <[email protected]>,
 *                        Jaroslav Kysela <[email protected]>
 */

#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/seq_kernel.h>
#include <sound/seq_midi_event.h>
#include <sound/asoundef.h>

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;

/* event type, index into status_event[] */
/* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
#define ST_INVALID …
#define ST_SPECIAL …
#define ST_SYSEX …
/* from 8 to 15 are events for 0xf0-0xf7 */


/*
 * prototypes
 */
static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev);
static void note_decode(struct snd_seq_event *ev, unsigned char *buf);
static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf);
static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf);
static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf);
static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf);

/*
 * event list
 */
static struct status_event_list { … } status_event[] = …;

static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf, int len,
			       struct snd_seq_event *ev);
static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf, int count,
			     struct snd_seq_event *ev);

static struct extra_event_list { … } extra_event[] = …;

/*
 *  new/delete record
 */

int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
{ … }
EXPORT_SYMBOL(…);

void snd_midi_event_free(struct snd_midi_event *dev)
{ … }
EXPORT_SYMBOL(…);

/*
 * initialize record
 */
static inline void reset_encode(struct snd_midi_event *dev)
{ … }

void snd_midi_event_reset_encode(struct snd_midi_event *dev)
{ … }
EXPORT_SYMBOL(…);

void snd_midi_event_reset_decode(struct snd_midi_event *dev)
{ … }
EXPORT_SYMBOL(…);

void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
{ … }
EXPORT_SYMBOL(…);

/*
 *  read one byte and encode to sequencer event:
 *  return true if MIDI bytes are encoded to an event
 *         false data is not finished
 */
bool snd_midi_event_encode_byte(struct snd_midi_event *dev, unsigned char c,
				struct snd_seq_event *ev)
{ … }
EXPORT_SYMBOL(…);

/* encode note event */
static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/* encode one parameter controls */
static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/* encode pitch wheel change */
static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/* encode midi control change */
static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/* encode one parameter value*/
static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/* encode song position */
static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{ … }

/*
 * decode from a sequencer event to midi bytes
 * return the size of decoded midi events
 */
long snd_midi_event_decode(struct snd_midi_event *dev, unsigned char *buf, long count,
			   struct snd_seq_event *ev)
{ … }
EXPORT_SYMBOL(…);


/* decode note event */
static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
{ … }

/* decode one parameter controls */
static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
{ … }

/* decode pitch wheel change */
static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
{ … }

/* decode midi control change */
static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
{ … }

/* decode song position */
static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
{ … }

/* decode 14bit control */
static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
			       int count, struct snd_seq_event *ev)
{ … }

/* decode reg/nonreg param */
static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
			     int count, struct snd_seq_event *ev)
{ … }