[deliverable/linux.git] / sound / core / seq / seq_midi_event.c

/*
 *  MIDI byte <-> sequencer event coder
 *
 *  Copyright (C) 1998,99 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 <linux/slab.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/seq_kernel.h>
#include <sound/seq_midi_event.h>
#include <sound/asoundef.h>

MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
MODULE_LICENSE("GPL");

/* event type, index into status_event[] */
/* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
#define ST_INVALID	7
#define ST_SPECIAL	8
#define ST_SYSEX	ST_SPECIAL
/* 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 {
	int event;
	int qlen;
	void (*encode)(struct snd_midi_event *dev, struct snd_seq_event *ev);
	void (*decode)(struct snd_seq_event *ev, unsigned char *buf);
} status_event[] = {
	/* 0x80 - 0xef */
	{SNDRV_SEQ_EVENT_NOTEOFF,	 2, note_event, note_decode},
	{SNDRV_SEQ_EVENT_NOTEON,	 2, note_event, note_decode},
	{SNDRV_SEQ_EVENT_KEYPRESS,	 2, note_event, note_decode},
	{SNDRV_SEQ_EVENT_CONTROLLER,	 2, two_param_ctrl_event, two_param_decode},
	{SNDRV_SEQ_EVENT_PGMCHANGE,	 1, one_param_ctrl_event, one_param_decode},
	{SNDRV_SEQ_EVENT_CHANPRESS,	 1, one_param_ctrl_event, one_param_decode},
	{SNDRV_SEQ_EVENT_PITCHBEND,	 2, pitchbend_ctrl_event, pitchbend_decode},
	/* invalid */
	{SNDRV_SEQ_EVENT_NONE,		-1, NULL, NULL},
	/* 0xf0 - 0xff */
	{SNDRV_SEQ_EVENT_SYSEX,		 1, NULL, NULL}, /* sysex: 0xf0 */
	{SNDRV_SEQ_EVENT_QFRAME,	 1, one_param_event, one_param_decode}, /* 0xf1 */
	{SNDRV_SEQ_EVENT_SONGPOS,	 2, songpos_event, songpos_decode}, /* 0xf2 */
	{SNDRV_SEQ_EVENT_SONGSEL,	 1, one_param_event, one_param_decode}, /* 0xf3 */
	{SNDRV_SEQ_EVENT_NONE,		-1, NULL, NULL}, /* 0xf4 */
	{SNDRV_SEQ_EVENT_NONE,		-1, NULL, NULL}, /* 0xf5 */
	{SNDRV_SEQ_EVENT_TUNE_REQUEST,	 0, NULL, NULL}, /* 0xf6 */
	{SNDRV_SEQ_EVENT_NONE,		-1, NULL, NULL}, /* 0xf7 */
	{SNDRV_SEQ_EVENT_CLOCK,		 0, NULL, NULL}, /* 0xf8 */
	{SNDRV_SEQ_EVENT_NONE,		-1, NULL, NULL}, /* 0xf9 */
	{SNDRV_SEQ_EVENT_START,		 0, NULL, NULL}, /* 0xfa */
	{SNDRV_SEQ_EVENT_CONTINUE,	 0, NULL, NULL}, /* 0xfb */
	{SNDRV_SEQ_EVENT_STOP, 		 0, NULL, NULL}, /* 0xfc */
	{SNDRV_SEQ_EVENT_NONE, 		-1, NULL, NULL}, /* 0xfd */
	{SNDRV_SEQ_EVENT_SENSING, 	 0, NULL, NULL}, /* 0xfe */
	{SNDRV_SEQ_EVENT_RESET, 	 0, NULL, NULL}, /* 0xff */
};

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 {
	int event;
	int (*decode)(struct snd_midi_event *dev, unsigned char *buf, int len,
		      struct snd_seq_event *ev);
} extra_event[] = {
	{SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
	{SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
	{SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
};

/*
 *  new/delete record
 */

int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
{
	struct snd_midi_event *dev;

	*rdev = NULL;
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (dev == NULL)
		return -ENOMEM;
	if (bufsize > 0) {
		dev->buf = kmalloc(bufsize, GFP_KERNEL);
		if (dev->buf == NULL) {
			kfree(dev);
			return -ENOMEM;
		}
	}
	dev->bufsize = bufsize;
	dev->lastcmd = 0xff;
	dev->type = ST_INVALID;
	spin_lock_init(&dev->lock);
	*rdev = dev;
	return 0;
}

void snd_midi_event_free(struct snd_midi_event *dev)
{
	if (dev != NULL) {
		kfree(dev->buf);
		kfree(dev);
	}
}

/*
 * initialize record
 */
static inline void reset_encode(struct snd_midi_event *dev)
{
	dev->read = 0;
	dev->qlen = 0;
	dev->type = ST_INVALID;
}

void snd_midi_event_reset_encode(struct snd_midi_event *dev)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->lock, flags);
	reset_encode(dev);
	spin_unlock_irqrestore(&dev->lock, flags);
}

void snd_midi_event_reset_decode(struct snd_midi_event *dev)
{
	unsigned long flags;

	spin_lock_irqsave(&dev->lock, flags);
	dev->lastcmd = 0xff;
	spin_unlock_irqrestore(&dev->lock, flags);
}

#if 0
void snd_midi_event_init(struct snd_midi_event *dev)
{
	snd_midi_event_reset_encode(dev);
	snd_midi_event_reset_decode(dev);
}
#endif  /*  0  */

void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
{
	dev->nostat = on ? 1 : 0;
}

/*
 * resize buffer
 */
#if 0
int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
{
	unsigned char *new_buf, *old_buf;
	unsigned long flags;

	if (bufsize == dev->bufsize)
		return 0;
	new_buf = kmalloc(bufsize, GFP_KERNEL);
	if (new_buf == NULL)
		return -ENOMEM;
	spin_lock_irqsave(&dev->lock, flags);
	old_buf = dev->buf;
	dev->buf = new_buf;
	dev->bufsize = bufsize;
	reset_encode(dev);
	spin_unlock_irqrestore(&dev->lock, flags);
	kfree(old_buf);
	return 0;
}
#endif  /*  0  */

/*
 *  read bytes and encode to sequencer event if finished
 *  return the size of encoded bytes
 */
long snd_midi_event_encode(struct snd_midi_event *dev, unsigned char *buf, long count,
			   struct snd_seq_event *ev)
{
	long result = 0;
	int rc;

	ev->type = SNDRV_SEQ_EVENT_NONE;

	while (count-- > 0) {
		rc = snd_midi_event_encode_byte(dev, *buf++, ev);
		result++;
		if (rc < 0)
			return rc;
		else if (rc > 0)
			return result;
	}

	return result;
}

/*
 *  read one byte and encode to sequencer event:
 *  return 1 if MIDI bytes are encoded to an event
 *         0 data is not finished
 *         negative for error
 */
int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
			       struct snd_seq_event *ev)
{
	int rc = 0;
	unsigned long flags;

	c &= 0xff;

	if (c >= MIDI_CMD_COMMON_CLOCK) {
		/* real-time event */
		ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
		ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
		ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
		return ev->type != SNDRV_SEQ_EVENT_NONE;
	}

	spin_lock_irqsave(&dev->lock, flags);
	if ((c & 0x80) &&
	    (c != MIDI_CMD_COMMON_SYSEX_END || dev->type != ST_SYSEX)) {
		/* new command */
		dev->buf[0] = c;
		if ((c & 0xf0) == 0xf0) /* system messages */
			dev->type = (c & 0x0f) + ST_SPECIAL;
		else
			dev->type = (c >> 4) & 0x07;
		dev->read = 1;
		dev->qlen = status_event[dev->type].qlen;
	} else {
		if (dev->qlen > 0) {
			/* rest of command */
			dev->buf[dev->read++] = c;
			if (dev->type != ST_SYSEX)
				dev->qlen--;
		} else {
			/* running status */
			dev->buf[1] = c;
			dev->qlen = status_event[dev->type].qlen - 1;
			dev->read = 2;
		}
	}
	if (dev->qlen == 0) {
		ev->type = status_event[dev->type].event;
		ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
		ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
		if (status_event[dev->type].encode) /* set data values */
			status_event[dev->type].encode(dev, ev);
		if (dev->type >= ST_SPECIAL)
			dev->type = ST_INVALID;
		rc = 1;
	} else 	if (dev->type == ST_SYSEX) {
		if (c == MIDI_CMD_COMMON_SYSEX_END ||
		    dev->read >= dev->bufsize) {
			ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
			ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
			ev->type = SNDRV_SEQ_EVENT_SYSEX;
			ev->data.ext.len = dev->read;
			ev->data.ext.ptr = dev->buf;
			if (c != MIDI_CMD_COMMON_SYSEX_END)
				dev->read = 0; /* continue to parse */
			else
				reset_encode(dev); /* all parsed */
			rc = 1;
		}
	}

	spin_unlock_irqrestore(&dev->lock, flags);
	return rc;
}

/* encode note event */
static void note_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.note.channel = dev->buf[0] & 0x0f;
	ev->data.note.note = dev->buf[1];
	ev->data.note.velocity = dev->buf[2];
}

/* encode one parameter controls */
static void one_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.control.channel = dev->buf[0] & 0x0f;
	ev->data.control.value = dev->buf[1];
}

/* encode pitch wheel change */
static void pitchbend_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.control.channel = dev->buf[0] & 0x0f;
	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
}

/* encode midi control change */
static void two_param_ctrl_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.control.channel = dev->buf[0] & 0x0f;
	ev->data.control.param = dev->buf[1];
	ev->data.control.value = dev->buf[2];
}

/* encode one parameter value*/
static void one_param_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.control.value = dev->buf[1];
}

/* encode song position */
static void songpos_event(struct snd_midi_event *dev, struct snd_seq_event *ev)
{
	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
}

/*
 * 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)
{
	unsigned int cmd, type;

	if (ev->type == SNDRV_SEQ_EVENT_NONE)
		return -ENOENT;

	for (type = 0; type < ARRAY_SIZE(status_event); type++) {
		if (ev->type == status_event[type].event)
			goto __found;
	}
	for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
		if (ev->type == extra_event[type].event)
			return extra_event[type].decode(dev, buf, count, ev);
	}
	return -ENOENT;

      __found:
	if (type >= ST_SPECIAL)
		cmd = 0xf0 + (type - ST_SPECIAL);
	else
		/* data.note.channel and data.control.channel is identical */
		cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);


	if (cmd == MIDI_CMD_COMMON_SYSEX) {
		snd_midi_event_reset_decode(dev);
		return snd_seq_expand_var_event(ev, count, buf, 1, 0);
	} else {
		int qlen;
		unsigned char xbuf[4];
		unsigned long flags;

		spin_lock_irqsave(&dev->lock, flags);
		if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
			dev->lastcmd = cmd;
			spin_unlock_irqrestore(&dev->lock, flags);
			xbuf[0] = cmd;
			if (status_event[type].decode)
				status_event[type].decode(ev, xbuf + 1);
			qlen = status_event[type].qlen + 1;
		} else {
			spin_unlock_irqrestore(&dev->lock, flags);
			if (status_event[type].decode)
				status_event[type].decode(ev, xbuf + 0);
			qlen = status_event[type].qlen;
		}
		if (count < qlen)
			return -ENOMEM;
		memcpy(buf, xbuf, qlen);
		return qlen;
	}
}


/* decode note event */
static void note_decode(struct snd_seq_event *ev, unsigned char *buf)
{
	buf[0] = ev->data.note.note & 0x7f;
	buf[1] = ev->data.note.velocity & 0x7f;
}

/* decode one parameter controls */
static void one_param_decode(struct snd_seq_event *ev, unsigned char *buf)
{
	buf[0] = ev->data.control.value & 0x7f;
}

/* decode pitch wheel change */
static void pitchbend_decode(struct snd_seq_event *ev, unsigned char *buf)
{
	int value = ev->data.control.value + 8192;
	buf[0] = value & 0x7f;
	buf[1] = (value >> 7) & 0x7f;
}

/* decode midi control change */
static void two_param_decode(struct snd_seq_event *ev, unsigned char *buf)
{
	buf[0] = ev->data.control.param & 0x7f;
	buf[1] = ev->data.control.value & 0x7f;
}

/* decode song position */
static void songpos_decode(struct snd_seq_event *ev, unsigned char *buf)
{
	buf[0] = ev->data.control.value & 0x7f;
	buf[1] = (ev->data.control.value >> 7) & 0x7f;
}

/* decode 14bit control */
static int extra_decode_ctrl14(struct snd_midi_event *dev, unsigned char *buf,
			       int count, struct snd_seq_event *ev)
{
	unsigned char cmd;
	int idx = 0;

	cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
	if (ev->data.control.param < 0x20) {
		if (count < 4)
			return -ENOMEM;
		if (dev->nostat && count < 6)
			return -ENOMEM;
		if (cmd != dev->lastcmd || dev->nostat) {
			if (count < 5)
				return -ENOMEM;
			buf[idx++] = dev->lastcmd = cmd;
		}
		buf[idx++] = ev->data.control.param;
		buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
		if (dev->nostat)
			buf[idx++] = cmd;
		buf[idx++] = ev->data.control.param + 0x20;
		buf[idx++] = ev->data.control.value & 0x7f;
	} else {
		if (count < 2)
			return -ENOMEM;
		if (cmd != dev->lastcmd || dev->nostat) {
			if (count < 3)
				return -ENOMEM;
			buf[idx++] = dev->lastcmd = cmd;
		}
		buf[idx++] = ev->data.control.param & 0x7f;
		buf[idx++] = ev->data.control.value & 0x7f;
	}
	return idx;
}

/* decode reg/nonreg param */
static int extra_decode_xrpn(struct snd_midi_event *dev, unsigned char *buf,
			     int count, struct snd_seq_event *ev)
{
	unsigned char cmd;
	char *cbytes;
	static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
				       MIDI_CTL_NONREG_PARM_NUM_LSB,
				       MIDI_CTL_MSB_DATA_ENTRY,
				       MIDI_CTL_LSB_DATA_ENTRY };
	static char cbytes_rpn[4] =  { MIDI_CTL_REGIST_PARM_NUM_MSB,
				       MIDI_CTL_REGIST_PARM_NUM_LSB,
				       MIDI_CTL_MSB_DATA_ENTRY,
				       MIDI_CTL_LSB_DATA_ENTRY };
	unsigned char bytes[4];
	int idx = 0, i;

	if (count < 8)
		return -ENOMEM;
	if (dev->nostat && count < 12)
		return -ENOMEM;
	cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
	bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
	bytes[1] = ev->data.control.param & 0x007f;
	bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
	bytes[3] = ev->data.control.value & 0x007f;
	if (cmd != dev->lastcmd && !dev->nostat) {
		if (count < 9)
			return -ENOMEM;
		buf[idx++] = dev->lastcmd = cmd;
	}
	cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
	for (i = 0; i < 4; i++) {
		if (dev->nostat)
			buf[idx++] = dev->lastcmd = cmd;
		buf[idx++] = cbytes[i];
		buf[idx++] = bytes[i];
	}
	return idx;
}

/*
 *  exports
 */
 
EXPORT_SYMBOL(snd_midi_event_new);
EXPORT_SYMBOL(snd_midi_event_free);
EXPORT_SYMBOL(snd_midi_event_reset_encode);
EXPORT_SYMBOL(snd_midi_event_reset_decode);
EXPORT_SYMBOL(snd_midi_event_no_status);
EXPORT_SYMBOL(snd_midi_event_encode);
EXPORT_SYMBOL(snd_midi_event_encode_byte);
EXPORT_SYMBOL(snd_midi_event_decode);

static int __init alsa_seq_midi_event_init(void)
{
	return 0;
}

static void __exit alsa_seq_midi_event_exit(void)
{
}

module_init(alsa_seq_midi_event_init)
module_exit(alsa_seq_midi_event_exit)
Commit	Line	Data
1da177e4 LT	1	/*
	2	* MIDI byte <-> sequencer event coder
	3	*
	4	* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>,
c1017a4c	5	* Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	20	*/
	21
1da177e4 LT	22	#include <linux/slab.h>
	23	#include <linux/errno.h>
	24	#include <linux/string.h>
	25	#include <sound/core.h>
	26	#include <sound/seq_kernel.h>
	27	#include <sound/seq_midi_event.h>
	28	#include <sound/asoundef.h>
	29
c1017a4c	30	MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	31	MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
	32	MODULE_LICENSE("GPL");
	33
394d0516 CL	34	/* event type, index into status_event[] */
	35	/* from 0 to 6 are normal commands (note off, on, etc.) for 0x9?-0xe? */
	36	#define ST_INVALID 7
1da177e4 LT	37	#define ST_SPECIAL 8
	38	#define ST_SYSEX ST_SPECIAL
	39	/* from 8 to 15 are events for 0xf0-0xf7 */
	40
	41
1da177e4 LT	42	/*
	43	* prototypes
	44	*/
c7e0b5bf TI	45	static void note_event(struct snd_midi_event dev, struct snd_seq_event ev);
	46	static void one_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	47	static void pitchbend_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	48	static void two_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	49	static void one_param_event(struct snd_midi_event dev, struct snd_seq_event ev);
	50	static void songpos_event(struct snd_midi_event dev, struct snd_seq_event ev);
	51	static void note_decode(struct snd_seq_event ev, unsigned char buf);
	52	static void one_param_decode(struct snd_seq_event ev, unsigned char buf);
	53	static void pitchbend_decode(struct snd_seq_event ev, unsigned char buf);
	54	static void two_param_decode(struct snd_seq_event ev, unsigned char buf);
	55	static void songpos_decode(struct snd_seq_event ev, unsigned char buf);
1da177e4 LT	56
	57	/*
	58	* event list
	59	*/
c7e0b5bf	60	static struct status_event_list {
1da177e4 LT	61	int event;
1da177e4 LT	62	int qlen;
c7e0b5bf TI	63	void (encode)(struct snd_midi_event dev, struct snd_seq_event *ev);
c7e0b5bf TI	64	void (decode)(struct snd_seq_event ev, unsigned char *buf);
1da177e4	65	} status_event[] = {
394d0516	66	/* 0x80 - 0xef */
bf8c1382 CL	67	{SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
	68	{SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
	69	{SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
	70	{SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
	71	{SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
	72	{SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
	73	{SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
394d0516	74	/* invalid */
bf8c1382	75	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL},
1da177e4	76	/* 0xf0 - 0xff */
bf8c1382 CL	77	{SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
	78	{SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
	79	{SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
	80	{SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
	81	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf4 */
	82	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf5 */
	83	{SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
	84	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf7 */
	85	{SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
	86	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xf9 */
	87	{SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
	88	{SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
	89	{SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
	90	{SNDRV_SEQ_EVENT_NONE, -1, NULL, NULL}, /* 0xfd */
	91	{SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
	92	{SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
1da177e4 LT	93	};
1da177e4 LT	94
c7e0b5bf TI	95	static int extra_decode_ctrl14(struct snd_midi_event dev, unsigned char buf, int len,
	96	struct snd_seq_event *ev);
	97	static int extra_decode_xrpn(struct snd_midi_event dev, unsigned char buf, int count,
	98	struct snd_seq_event *ev);
1da177e4	99
c7e0b5bf	100	static struct extra_event_list {
1da177e4	101	int event;
c7e0b5bf TI	102	int (decode)(struct snd_midi_event dev, unsigned char *buf, int len,
c7e0b5bf TI	103	struct snd_seq_event *ev);
1da177e4 LT	104	} extra_event[] = {
	105	{SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
	106	{SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
	107	{SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
	108	};
	109
	110	/*
	111	* new/delete record
	112	*/
	113
c7e0b5bf	114	int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
1da177e4	115	{
c7e0b5bf	116	struct snd_midi_event *dev;
1da177e4 LT	117
1da177e4 LT	118	*rdev = NULL;
ecca82b4	119	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	120	if (dev == NULL)
	121	return -ENOMEM;
	122	if (bufsize > 0) {
	123	dev->buf = kmalloc(bufsize, GFP_KERNEL);
	124	if (dev->buf == NULL) {
	125	kfree(dev);
	126	return -ENOMEM;
	127	}
	128	}
	129	dev->bufsize = bufsize;
	130	dev->lastcmd = 0xff;
394d0516	131	dev->type = ST_INVALID;
1da177e4 LT	132	spin_lock_init(&dev->lock);
	133	*rdev = dev;
	134	return 0;
	135	}
	136
c7e0b5bf	137	void snd_midi_event_free(struct snd_midi_event *dev)
1da177e4 LT	138	{
	139	if (dev != NULL) {
	140	kfree(dev->buf);
	141	kfree(dev);
	142	}
	143	}
	144
	145	/*
	146	* initialize record
	147	*/
c7e0b5bf	148	static inline void reset_encode(struct snd_midi_event *dev)
1da177e4 LT	149	{
	150	dev->read = 0;
	151	dev->qlen = 0;
394d0516	152	dev->type = ST_INVALID;
1da177e4 LT	153	}
1da177e4 LT	154
c7e0b5bf	155	void snd_midi_event_reset_encode(struct snd_midi_event *dev)
1da177e4 LT	156	{
	157	unsigned long flags;
	158
	159	spin_lock_irqsave(&dev->lock, flags);
	160	reset_encode(dev);
	161	spin_unlock_irqrestore(&dev->lock, flags);
	162	}
	163
c7e0b5bf	164	void snd_midi_event_reset_decode(struct snd_midi_event *dev)
1da177e4 LT	165	{
	166	unsigned long flags;
	167
	168	spin_lock_irqsave(&dev->lock, flags);
	169	dev->lastcmd = 0xff;
	170	spin_unlock_irqrestore(&dev->lock, flags);
	171	}
	172
123992f7	173	#if 0
c7e0b5bf	174	void snd_midi_event_init(struct snd_midi_event *dev)
1da177e4 LT	175	{
	176	snd_midi_event_reset_encode(dev);
	177	snd_midi_event_reset_decode(dev);
	178	}
123992f7	179	#endif /* 0 */
1da177e4	180
c7e0b5bf	181	void snd_midi_event_no_status(struct snd_midi_event *dev, int on)
1da177e4 LT	182	{
	183	dev->nostat = on ? 1 : 0;
	184	}
	185
	186	/*
	187	* resize buffer
	188	*/
123992f7	189	#if 0
c7e0b5bf	190	int snd_midi_event_resize_buffer(struct snd_midi_event *dev, int bufsize)
1da177e4 LT	191	{
	192	unsigned char new_buf, old_buf;
	193	unsigned long flags;
	194
	195	if (bufsize == dev->bufsize)
	196	return 0;
	197	new_buf = kmalloc(bufsize, GFP_KERNEL);
	198	if (new_buf == NULL)
	199	return -ENOMEM;
	200	spin_lock_irqsave(&dev->lock, flags);
	201	old_buf = dev->buf;
	202	dev->buf = new_buf;
	203	dev->bufsize = bufsize;
	204	reset_encode(dev);
	205	spin_unlock_irqrestore(&dev->lock, flags);
	206	kfree(old_buf);
	207	return 0;
	208	}
123992f7	209	#endif /* 0 */
1da177e4 LT	210
	211	/*
	212	* read bytes and encode to sequencer event if finished
	213	* return the size of encoded bytes
	214	*/
c7e0b5bf TI	215	long snd_midi_event_encode(struct snd_midi_event dev, unsigned char buf, long count,
c7e0b5bf TI	216	struct snd_seq_event *ev)
1da177e4 LT	217	{
	218	long result = 0;
	219	int rc;
	220
	221	ev->type = SNDRV_SEQ_EVENT_NONE;
	222
	223	while (count-- > 0) {
	224	rc = snd_midi_event_encode_byte(dev, *buf++, ev);
	225	result++;
	226	if (rc < 0)
	227	return rc;
	228	else if (rc > 0)
	229	return result;
	230	}
	231
	232	return result;
	233	}
	234
	235	/*
	236	* read one byte and encode to sequencer event:
	237	* return 1 if MIDI bytes are encoded to an event
	238	* 0 data is not finished
	239	* negative for error
	240	*/
c7e0b5bf TI	241	int snd_midi_event_encode_byte(struct snd_midi_event *dev, int c,
c7e0b5bf TI	242	struct snd_seq_event *ev)
1da177e4 LT	243	{
	244	int rc = 0;
	245	unsigned long flags;
	246
	247	c &= 0xff;
	248
	249	if (c >= MIDI_CMD_COMMON_CLOCK) {
	250	/* real-time event */
	251	ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
	252	ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
	253	ev->flags \|= SNDRV_SEQ_EVENT_LENGTH_FIXED;
0e75182c	254	return ev->type != SNDRV_SEQ_EVENT_NONE;
1da177e4 LT	255	}
	256
	257	spin_lock_irqsave(&dev->lock, flags);
bf8c1382 CL	258	if ((c & 0x80) &&
bf8c1382 CL	259	(c != MIDI_CMD_COMMON_SYSEX_END \|\| dev->type != ST_SYSEX)) {
1da177e4	260	/* new command */
bf8c1382 CL	261	dev->buf[0] = c;
	262	if ((c & 0xf0) == 0xf0) /* system messages */
	263	dev->type = (c & 0x0f) + ST_SPECIAL;
	264	else
	265	dev->type = (c >> 4) & 0x07;
1da177e4	266	dev->read = 1;
bf8c1382 CL	267	dev->qlen = status_event[dev->type].qlen;
	268	} else {
	269	if (dev->qlen > 0) {
	270	/* rest of command */
1da177e4	271	dev->buf[dev->read++] = c;
bf8c1382 CL	272	if (dev->type != ST_SYSEX)
	273	dev->qlen--;
	274	} else {
	275	/* running status */
	276	dev->buf[1] = c;
1da177e4	277	dev->qlen = status_event[dev->type].qlen - 1;
bf8c1382	278	dev->read = 2;
1da177e4 LT	279	}
	280	}
	281	if (dev->qlen == 0) {
	282	ev->type = status_event[dev->type].event;
	283	ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
	284	ev->flags \|= SNDRV_SEQ_EVENT_LENGTH_FIXED;
	285	if (status_event[dev->type].encode) /* set data values */
	286	status_event[dev->type].encode(dev, ev);
0b664f72 CL	287	if (dev->type >= ST_SPECIAL)
0b664f72 CL	288	dev->type = ST_INVALID;
1da177e4 LT	289	rc = 1;
	290	} else if (dev->type == ST_SYSEX) {
	291	if (c == MIDI_CMD_COMMON_SYSEX_END \|\|
	292	dev->read >= dev->bufsize) {
	293	ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
	294	ev->flags \|= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
	295	ev->type = SNDRV_SEQ_EVENT_SYSEX;
	296	ev->data.ext.len = dev->read;
	297	ev->data.ext.ptr = dev->buf;
	298	if (c != MIDI_CMD_COMMON_SYSEX_END)
	299	dev->read = 0; /* continue to parse */
	300	else
	301	reset_encode(dev); /* all parsed */
	302	rc = 1;
	303	}
	304	}
	305
	306	spin_unlock_irqrestore(&dev->lock, flags);
	307	return rc;
	308	}
	309
	310	/* encode note event */
c7e0b5bf	311	static void note_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	312	{
	313	ev->data.note.channel = dev->buf[0] & 0x0f;
	314	ev->data.note.note = dev->buf[1];
	315	ev->data.note.velocity = dev->buf[2];
	316	}
	317
	318	/* encode one parameter controls */
c7e0b5bf	319	static void one_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	320	{
	321	ev->data.control.channel = dev->buf[0] & 0x0f;
	322	ev->data.control.value = dev->buf[1];
	323	}
	324
	325	/* encode pitch wheel change */
c7e0b5bf	326	static void pitchbend_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	327	{
	328	ev->data.control.channel = dev->buf[0] & 0x0f;
	329	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
	330	}
	331
	332	/* encode midi control change */
c7e0b5bf	333	static void two_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	334	{
	335	ev->data.control.channel = dev->buf[0] & 0x0f;
	336	ev->data.control.param = dev->buf[1];
	337	ev->data.control.value = dev->buf[2];
	338	}
	339
	340	/* encode one parameter value*/
c7e0b5bf	341	static void one_param_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	342	{
	343	ev->data.control.value = dev->buf[1];
	344	}
	345
	346	/* encode song position */
c7e0b5bf	347	static void songpos_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	348	{
	349	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
	350	}
	351
	352	/*
	353	* decode from a sequencer event to midi bytes
	354	* return the size of decoded midi events
	355	*/
c7e0b5bf TI	356	long snd_midi_event_decode(struct snd_midi_event dev, unsigned char buf, long count,
c7e0b5bf TI	357	struct snd_seq_event *ev)
1da177e4 LT	358	{
	359	unsigned int cmd, type;
	360
	361	if (ev->type == SNDRV_SEQ_EVENT_NONE)
	362	return -ENOENT;
	363
	364	for (type = 0; type < ARRAY_SIZE(status_event); type++) {
	365	if (ev->type == status_event[type].event)
	366	goto __found;
	367	}
	368	for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
	369	if (ev->type == extra_event[type].event)
	370	return extra_event[type].decode(dev, buf, count, ev);
	371	}
	372	return -ENOENT;
	373
	374	__found:
	375	if (type >= ST_SPECIAL)
	376	cmd = 0xf0 + (type - ST_SPECIAL);
	377	else
	378	/* data.note.channel and data.control.channel is identical */
	379	cmd = 0x80 \| (type << 4) \| (ev->data.note.channel & 0x0f);
	380
	381
	382	if (cmd == MIDI_CMD_COMMON_SYSEX) {
	383	snd_midi_event_reset_decode(dev);
	384	return snd_seq_expand_var_event(ev, count, buf, 1, 0);
	385	} else {
	386	int qlen;
	387	unsigned char xbuf[4];
	388	unsigned long flags;
	389
	390	spin_lock_irqsave(&dev->lock, flags);
	391	if ((cmd & 0xf0) == 0xf0 \|\| dev->lastcmd != cmd \|\| dev->nostat) {
	392	dev->lastcmd = cmd;
	393	spin_unlock_irqrestore(&dev->lock, flags);
	394	xbuf[0] = cmd;
	395	if (status_event[type].decode)
	396	status_event[type].decode(ev, xbuf + 1);
	397	qlen = status_event[type].qlen + 1;
	398	} else {
	399	spin_unlock_irqrestore(&dev->lock, flags);
	400	if (status_event[type].decode)
	401	status_event[type].decode(ev, xbuf + 0);
	402	qlen = status_event[type].qlen;
	403	}
	404	if (count < qlen)
	405	return -ENOMEM;
	406	memcpy(buf, xbuf, qlen);
	407	return qlen;
	408	}
	409	}
	410
	411
	412	/* decode note event */
c7e0b5bf	413	static void note_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	414	{
	415	buf[0] = ev->data.note.note & 0x7f;
	416	buf[1] = ev->data.note.velocity & 0x7f;
	417	}
	418
	419	/* decode one parameter controls */
c7e0b5bf	420	static void one_param_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	421	{
	422	buf[0] = ev->data.control.value & 0x7f;
	423	}
	424
	425	/* decode pitch wheel change */
c7e0b5bf	426	static void pitchbend_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	427	{
	428	int value = ev->data.control.value + 8192;
	429	buf[0] = value & 0x7f;
	430	buf[1] = (value >> 7) & 0x7f;
	431	}
	432
	433	/* decode midi control change */
c7e0b5bf	434	static void two_param_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	435	{
	436	buf[0] = ev->data.control.param & 0x7f;
	437	buf[1] = ev->data.control.value & 0x7f;
	438	}
	439
	440	/* decode song position */
c7e0b5bf	441	static void songpos_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	442	{
	443	buf[0] = ev->data.control.value & 0x7f;
	444	buf[1] = (ev->data.control.value >> 7) & 0x7f;
	445	}
	446
	447	/* decode 14bit control */
c7e0b5bf TI	448	static int extra_decode_ctrl14(struct snd_midi_event dev, unsigned char buf,
c7e0b5bf TI	449	int count, struct snd_seq_event *ev)
1da177e4 LT	450	{
	451	unsigned char cmd;
	452	int idx = 0;
	453
	454	cmd = MIDI_CMD_CONTROL\|(ev->data.control.channel & 0x0f);
	455	if (ev->data.control.param < 0x20) {
	456	if (count < 4)
	457	return -ENOMEM;
	458	if (dev->nostat && count < 6)
	459	return -ENOMEM;
	460	if (cmd != dev->lastcmd \|\| dev->nostat) {
	461	if (count < 5)
	462	return -ENOMEM;
	463	buf[idx++] = dev->lastcmd = cmd;
	464	}
	465	buf[idx++] = ev->data.control.param;
	466	buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
	467	if (dev->nostat)
	468	buf[idx++] = cmd;
	469	buf[idx++] = ev->data.control.param + 0x20;
	470	buf[idx++] = ev->data.control.value & 0x7f;
	471	} else {
	472	if (count < 2)
	473	return -ENOMEM;
	474	if (cmd != dev->lastcmd \|\| dev->nostat) {
	475	if (count < 3)
	476	return -ENOMEM;
	477	buf[idx++] = dev->lastcmd = cmd;
	478	}
	479	buf[idx++] = ev->data.control.param & 0x7f;
	480	buf[idx++] = ev->data.control.value & 0x7f;
	481	}
	482	return idx;
	483	}
	484
	485	/* decode reg/nonreg param */
c7e0b5bf TI	486	static int extra_decode_xrpn(struct snd_midi_event dev, unsigned char buf,
c7e0b5bf TI	487	int count, struct snd_seq_event *ev)
1da177e4 LT	488	{
	489	unsigned char cmd;
	490	char *cbytes;
	491	static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
	492	MIDI_CTL_NONREG_PARM_NUM_LSB,
	493	MIDI_CTL_MSB_DATA_ENTRY,
	494	MIDI_CTL_LSB_DATA_ENTRY };
	495	static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
	496	MIDI_CTL_REGIST_PARM_NUM_LSB,
	497	MIDI_CTL_MSB_DATA_ENTRY,
	498	MIDI_CTL_LSB_DATA_ENTRY };
	499	unsigned char bytes[4];
	500	int idx = 0, i;
	501
	502	if (count < 8)
	503	return -ENOMEM;
	504	if (dev->nostat && count < 12)
	505	return -ENOMEM;
	506	cmd = MIDI_CMD_CONTROL\|(ev->data.control.channel & 0x0f);
6423f9ea CL	507	bytes[0] = (ev->data.control.param & 0x3f80) >> 7;
	508	bytes[1] = ev->data.control.param & 0x007f;
	509	bytes[2] = (ev->data.control.value & 0x3f80) >> 7;
	510	bytes[3] = ev->data.control.value & 0x007f;
1da177e4 LT	511	if (cmd != dev->lastcmd && !dev->nostat) {
	512	if (count < 9)
	513	return -ENOMEM;
	514	buf[idx++] = dev->lastcmd = cmd;
	515	}
	516	cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
	517	for (i = 0; i < 4; i++) {
	518	if (dev->nostat)
	519	buf[idx++] = dev->lastcmd = cmd;
	520	buf[idx++] = cbytes[i];
	521	buf[idx++] = bytes[i];
	522	}
	523	return idx;
	524	}
	525
	526	/*
	527	* exports
	528	*/
	529
	530	EXPORT_SYMBOL(snd_midi_event_new);
	531	EXPORT_SYMBOL(snd_midi_event_free);
1da177e4 LT	532	EXPORT_SYMBOL(snd_midi_event_reset_encode);
	533	EXPORT_SYMBOL(snd_midi_event_reset_decode);
	534	EXPORT_SYMBOL(snd_midi_event_no_status);
	535	EXPORT_SYMBOL(snd_midi_event_encode);
	536	EXPORT_SYMBOL(snd_midi_event_encode_byte);
	537	EXPORT_SYMBOL(snd_midi_event_decode);
	538
	539	static int __init alsa_seq_midi_event_init(void)
	540	{
	541	return 0;
	542	}
	543
	544	static void __exit alsa_seq_midi_event_exit(void)
	545	{
	546	}
	547
	548	module_init(alsa_seq_midi_event_init)
	549	module_exit(alsa_seq_midi_event_exit)