[mirror_ubuntu-artful-kernel.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@suse.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/driver.h>
#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@suse.cz>");
MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
MODULE_LICENSE("GPL");

/* queue type */
/* from 0 to 7 are normal commands (note off, on, etc.) */
#define ST_NOTEOFF	0
#define ST_NOTEON	1
#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 - 0xf0 */
	{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},
	{SNDRV_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf0 */
	/* 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,		0, NULL, NULL}, /* 0xf4 */
	{SNDRV_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf5 */
	{SNDRV_SEQ_EVENT_TUNE_REQUEST,	0, NULL, NULL},	/* 0xf6 */
	{SNDRV_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf7 */
	{SNDRV_SEQ_EVENT_CLOCK,		0, NULL, NULL}, /* 0xf8 */
	{SNDRV_SEQ_EVENT_NONE,		0, 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, 		0, 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;
	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 = 0;
}

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 1;
	}

	spin_lock_irqsave(&dev->lock, flags);
	if (dev->qlen > 0) {
		/* rest of command */
		dev->buf[dev->read++] = c;
		if (dev->type != ST_SYSEX)
			dev->qlen--;
	} else {
		/* new command */
		dev->read = 1;
		if (c & 0x80) {
			dev->buf[0] = c;
			if ((c & 0xf0) == 0xf0) /* special events */
				dev->type = (c & 0x0f) + ST_SPECIAL;
			else
				dev->type = (c >> 4) & 0x07;
			dev->qlen = status_event[dev->type].qlen;
		} else {
			/* process this byte as argument */
			dev->buf[dev->read++] = c;
			dev->qlen = status_event[dev->type].qlen - 1;
		}
	}
	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);
		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 & 0x007f;
	bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
	bytes[2] = ev->data.control.value & 0x007f;
	bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
	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>,
	5	* Jaroslav Kysela <perex@suse.cz>
	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
	22	#include <sound/driver.h>
	23	#include <linux/slab.h>
	24	#include <linux/errno.h>
	25	#include <linux/string.h>
	26	#include <sound/core.h>
	27	#include <sound/seq_kernel.h>
	28	#include <sound/seq_midi_event.h>
	29	#include <sound/asoundef.h>
	30
	31	MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
	32	MODULE_DESCRIPTION("MIDI byte <-> sequencer event coder");
	33	MODULE_LICENSE("GPL");
	34
	35	/* queue type */
	36	/* from 0 to 7 are normal commands (note off, on, etc.) */
	37	#define ST_NOTEOFF 0
	38	#define ST_NOTEON 1
	39	#define ST_SPECIAL 8
	40	#define ST_SYSEX ST_SPECIAL
	41	/* from 8 to 15 are events for 0xf0-0xf7 */
	42
	43
1da177e4 LT	44	/*
	45	* prototypes
	46	*/
c7e0b5bf TI	47	static void note_event(struct snd_midi_event dev, struct snd_seq_event ev);
	48	static void one_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	49	static void pitchbend_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	50	static void two_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev);
	51	static void one_param_event(struct snd_midi_event dev, struct snd_seq_event ev);
	52	static void songpos_event(struct snd_midi_event dev, struct snd_seq_event ev);
	53	static void note_decode(struct snd_seq_event ev, unsigned char buf);
	54	static void one_param_decode(struct snd_seq_event ev, unsigned char buf);
	55	static void pitchbend_decode(struct snd_seq_event ev, unsigned char buf);
	56	static void two_param_decode(struct snd_seq_event ev, unsigned char buf);
	57	static void songpos_decode(struct snd_seq_event ev, unsigned char buf);
1da177e4 LT	58
	59	/*
	60	* event list
	61	*/
c7e0b5bf	62	static struct status_event_list {
1da177e4 LT	63	int event;
1da177e4 LT	64	int qlen;
c7e0b5bf TI	65	void (encode)(struct snd_midi_event dev, struct snd_seq_event *ev);
c7e0b5bf TI	66	void (decode)(struct snd_seq_event ev, unsigned char *buf);
1da177e4 LT	67	} status_event[] = {
	68	/* 0x80 - 0xf0 */
	69	{SNDRV_SEQ_EVENT_NOTEOFF, 2, note_event, note_decode},
	70	{SNDRV_SEQ_EVENT_NOTEON, 2, note_event, note_decode},
	71	{SNDRV_SEQ_EVENT_KEYPRESS, 2, note_event, note_decode},
	72	{SNDRV_SEQ_EVENT_CONTROLLER, 2, two_param_ctrl_event, two_param_decode},
	73	{SNDRV_SEQ_EVENT_PGMCHANGE, 1, one_param_ctrl_event, one_param_decode},
	74	{SNDRV_SEQ_EVENT_CHANPRESS, 1, one_param_ctrl_event, one_param_decode},
	75	{SNDRV_SEQ_EVENT_PITCHBEND, 2, pitchbend_ctrl_event, pitchbend_decode},
	76	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf0 */
	77	/* 0xf0 - 0xff */
	78	{SNDRV_SEQ_EVENT_SYSEX, 1, NULL, NULL}, /* sysex: 0xf0 */
	79	{SNDRV_SEQ_EVENT_QFRAME, 1, one_param_event, one_param_decode}, /* 0xf1 */
	80	{SNDRV_SEQ_EVENT_SONGPOS, 2, songpos_event, songpos_decode}, /* 0xf2 */
	81	{SNDRV_SEQ_EVENT_SONGSEL, 1, one_param_event, one_param_decode}, /* 0xf3 */
	82	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf4 */
	83	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf5 */
	84	{SNDRV_SEQ_EVENT_TUNE_REQUEST, 0, NULL, NULL}, /* 0xf6 */
	85	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf7 */
	86	{SNDRV_SEQ_EVENT_CLOCK, 0, NULL, NULL}, /* 0xf8 */
	87	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xf9 */
	88	{SNDRV_SEQ_EVENT_START, 0, NULL, NULL}, /* 0xfa */
	89	{SNDRV_SEQ_EVENT_CONTINUE, 0, NULL, NULL}, /* 0xfb */
	90	{SNDRV_SEQ_EVENT_STOP, 0, NULL, NULL}, /* 0xfc */
	91	{SNDRV_SEQ_EVENT_NONE, 0, NULL, NULL}, /* 0xfd */
	92	{SNDRV_SEQ_EVENT_SENSING, 0, NULL, NULL}, /* 0xfe */
	93	{SNDRV_SEQ_EVENT_RESET, 0, NULL, NULL}, /* 0xff */
	94	};
	95
c7e0b5bf TI	96	static int extra_decode_ctrl14(struct snd_midi_event dev, unsigned char buf, int len,
	97	struct snd_seq_event *ev);
	98	static int extra_decode_xrpn(struct snd_midi_event dev, unsigned char buf, int count,
	99	struct snd_seq_event *ev);
1da177e4	100
c7e0b5bf	101	static struct extra_event_list {
1da177e4	102	int event;
c7e0b5bf TI	103	int (decode)(struct snd_midi_event dev, unsigned char *buf, int len,
c7e0b5bf TI	104	struct snd_seq_event *ev);
1da177e4 LT	105	} extra_event[] = {
	106	{SNDRV_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
	107	{SNDRV_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
	108	{SNDRV_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
	109	};
	110
	111	/*
	112	* new/delete record
	113	*/
	114
c7e0b5bf	115	int snd_midi_event_new(int bufsize, struct snd_midi_event **rdev)
1da177e4	116	{
c7e0b5bf	117	struct snd_midi_event *dev;
1da177e4 LT	118
1da177e4 LT	119	*rdev = NULL;
ecca82b4	120	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1da177e4 LT	121	if (dev == NULL)
	122	return -ENOMEM;
	123	if (bufsize > 0) {
	124	dev->buf = kmalloc(bufsize, GFP_KERNEL);
	125	if (dev->buf == NULL) {
	126	kfree(dev);
	127	return -ENOMEM;
	128	}
	129	}
	130	dev->bufsize = bufsize;
	131	dev->lastcmd = 0xff;
	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;
	152	dev->type = 0;
	153	}
	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;
	254	return 1;
	255	}
	256
	257	spin_lock_irqsave(&dev->lock, flags);
	258	if (dev->qlen > 0) {
	259	/* rest of command */
	260	dev->buf[dev->read++] = c;
	261	if (dev->type != ST_SYSEX)
	262	dev->qlen--;
	263	} else {
	264	/* new command */
	265	dev->read = 1;
	266	if (c & 0x80) {
	267	dev->buf[0] = c;
	268	if ((c & 0xf0) == 0xf0) /* special events */
	269	dev->type = (c & 0x0f) + ST_SPECIAL;
	270	else
	271	dev->type = (c >> 4) & 0x07;
	272	dev->qlen = status_event[dev->type].qlen;
	273	} else {
	274	/* process this byte as argument */
	275	dev->buf[dev->read++] = c;
	276	dev->qlen = status_event[dev->type].qlen - 1;
	277	}
	278	}
	279	if (dev->qlen == 0) {
	280	ev->type = status_event[dev->type].event;
	281	ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
	282	ev->flags \|= SNDRV_SEQ_EVENT_LENGTH_FIXED;
	283	if (status_event[dev->type].encode) /* set data values */
	284	status_event[dev->type].encode(dev, ev);
	285	rc = 1;
	286	} else if (dev->type == ST_SYSEX) {
	287	if (c == MIDI_CMD_COMMON_SYSEX_END \|\|
	288	dev->read >= dev->bufsize) {
	289	ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
	290	ev->flags \|= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
	291	ev->type = SNDRV_SEQ_EVENT_SYSEX;
	292	ev->data.ext.len = dev->read;
	293	ev->data.ext.ptr = dev->buf;
	294	if (c != MIDI_CMD_COMMON_SYSEX_END)
	295	dev->read = 0; /* continue to parse */
	296	else
	297	reset_encode(dev); /* all parsed */
	298	rc = 1;
	299	}
	300	}
	301
	302	spin_unlock_irqrestore(&dev->lock, flags);
	303	return rc;
	304	}
	305
	306	/* encode note event */
c7e0b5bf	307	static void note_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	308	{
	309	ev->data.note.channel = dev->buf[0] & 0x0f;
	310	ev->data.note.note = dev->buf[1];
	311	ev->data.note.velocity = dev->buf[2];
	312	}
	313
	314	/* encode one parameter controls */
c7e0b5bf	315	static void one_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	316	{
	317	ev->data.control.channel = dev->buf[0] & 0x0f;
	318	ev->data.control.value = dev->buf[1];
	319	}
	320
	321	/* encode pitch wheel change */
c7e0b5bf	322	static void pitchbend_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	323	{
	324	ev->data.control.channel = dev->buf[0] & 0x0f;
	325	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
	326	}
	327
	328	/* encode midi control change */
c7e0b5bf	329	static void two_param_ctrl_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	330	{
	331	ev->data.control.channel = dev->buf[0] & 0x0f;
	332	ev->data.control.param = dev->buf[1];
	333	ev->data.control.value = dev->buf[2];
	334	}
	335
	336	/* encode one parameter value*/
c7e0b5bf	337	static void one_param_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	338	{
	339	ev->data.control.value = dev->buf[1];
	340	}
	341
	342	/* encode song position */
c7e0b5bf	343	static void songpos_event(struct snd_midi_event dev, struct snd_seq_event ev)
1da177e4 LT	344	{
	345	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
	346	}
	347
	348	/*
	349	* decode from a sequencer event to midi bytes
	350	* return the size of decoded midi events
	351	*/
c7e0b5bf TI	352	long snd_midi_event_decode(struct snd_midi_event dev, unsigned char buf, long count,
c7e0b5bf TI	353	struct snd_seq_event *ev)
1da177e4 LT	354	{
	355	unsigned int cmd, type;
	356
	357	if (ev->type == SNDRV_SEQ_EVENT_NONE)
	358	return -ENOENT;
	359
	360	for (type = 0; type < ARRAY_SIZE(status_event); type++) {
	361	if (ev->type == status_event[type].event)
	362	goto __found;
	363	}
	364	for (type = 0; type < ARRAY_SIZE(extra_event); type++) {
	365	if (ev->type == extra_event[type].event)
	366	return extra_event[type].decode(dev, buf, count, ev);
	367	}
	368	return -ENOENT;
	369
	370	__found:
	371	if (type >= ST_SPECIAL)
	372	cmd = 0xf0 + (type - ST_SPECIAL);
	373	else
	374	/* data.note.channel and data.control.channel is identical */
	375	cmd = 0x80 \| (type << 4) \| (ev->data.note.channel & 0x0f);
	376
	377
	378	if (cmd == MIDI_CMD_COMMON_SYSEX) {
	379	snd_midi_event_reset_decode(dev);
	380	return snd_seq_expand_var_event(ev, count, buf, 1, 0);
	381	} else {
	382	int qlen;
	383	unsigned char xbuf[4];
	384	unsigned long flags;
	385
	386	spin_lock_irqsave(&dev->lock, flags);
	387	if ((cmd & 0xf0) == 0xf0 \|\| dev->lastcmd != cmd \|\| dev->nostat) {
	388	dev->lastcmd = cmd;
	389	spin_unlock_irqrestore(&dev->lock, flags);
	390	xbuf[0] = cmd;
	391	if (status_event[type].decode)
	392	status_event[type].decode(ev, xbuf + 1);
	393	qlen = status_event[type].qlen + 1;
	394	} else {
	395	spin_unlock_irqrestore(&dev->lock, flags);
	396	if (status_event[type].decode)
	397	status_event[type].decode(ev, xbuf + 0);
	398	qlen = status_event[type].qlen;
	399	}
	400	if (count < qlen)
	401	return -ENOMEM;
	402	memcpy(buf, xbuf, qlen);
	403	return qlen;
	404	}
	405	}
	406
	407
	408	/* decode note event */
c7e0b5bf	409	static void note_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	410	{
	411	buf[0] = ev->data.note.note & 0x7f;
	412	buf[1] = ev->data.note.velocity & 0x7f;
	413	}
	414
	415	/* decode one parameter controls */
c7e0b5bf	416	static void one_param_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	417	{
	418	buf[0] = ev->data.control.value & 0x7f;
	419	}
	420
	421	/* decode pitch wheel change */
c7e0b5bf	422	static void pitchbend_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	423	{
	424	int value = ev->data.control.value + 8192;
	425	buf[0] = value & 0x7f;
	426	buf[1] = (value >> 7) & 0x7f;
	427	}
	428
	429	/* decode midi control change */
c7e0b5bf	430	static void two_param_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	431	{
	432	buf[0] = ev->data.control.param & 0x7f;
	433	buf[1] = ev->data.control.value & 0x7f;
	434	}
	435
	436	/* decode song position */
c7e0b5bf	437	static void songpos_decode(struct snd_seq_event ev, unsigned char buf)
1da177e4 LT	438	{
	439	buf[0] = ev->data.control.value & 0x7f;
	440	buf[1] = (ev->data.control.value >> 7) & 0x7f;
	441	}
	442
	443	/* decode 14bit control */
c7e0b5bf TI	444	static int extra_decode_ctrl14(struct snd_midi_event dev, unsigned char buf,
c7e0b5bf TI	445	int count, struct snd_seq_event *ev)
1da177e4 LT	446	{
	447	unsigned char cmd;
	448	int idx = 0;
	449
	450	cmd = MIDI_CMD_CONTROL\|(ev->data.control.channel & 0x0f);
	451	if (ev->data.control.param < 0x20) {
	452	if (count < 4)
	453	return -ENOMEM;
	454	if (dev->nostat && count < 6)
	455	return -ENOMEM;
	456	if (cmd != dev->lastcmd \|\| dev->nostat) {
	457	if (count < 5)
	458	return -ENOMEM;
	459	buf[idx++] = dev->lastcmd = cmd;
	460	}
	461	buf[idx++] = ev->data.control.param;
	462	buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
	463	if (dev->nostat)
	464	buf[idx++] = cmd;
	465	buf[idx++] = ev->data.control.param + 0x20;
	466	buf[idx++] = ev->data.control.value & 0x7f;
	467	} else {
	468	if (count < 2)
	469	return -ENOMEM;
	470	if (cmd != dev->lastcmd \|\| dev->nostat) {
	471	if (count < 3)
	472	return -ENOMEM;
	473	buf[idx++] = dev->lastcmd = cmd;
	474	}
	475	buf[idx++] = ev->data.control.param & 0x7f;
	476	buf[idx++] = ev->data.control.value & 0x7f;
	477	}
	478	return idx;
	479	}
	480
	481	/* decode reg/nonreg param */
c7e0b5bf TI	482	static int extra_decode_xrpn(struct snd_midi_event dev, unsigned char buf,
c7e0b5bf TI	483	int count, struct snd_seq_event *ev)
1da177e4 LT	484	{
	485	unsigned char cmd;
	486	char *cbytes;
	487	static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
	488	MIDI_CTL_NONREG_PARM_NUM_LSB,
	489	MIDI_CTL_MSB_DATA_ENTRY,
	490	MIDI_CTL_LSB_DATA_ENTRY };
	491	static char cbytes_rpn[4] = { MIDI_CTL_REGIST_PARM_NUM_MSB,
	492	MIDI_CTL_REGIST_PARM_NUM_LSB,
	493	MIDI_CTL_MSB_DATA_ENTRY,
	494	MIDI_CTL_LSB_DATA_ENTRY };
	495	unsigned char bytes[4];
	496	int idx = 0, i;
	497
	498	if (count < 8)
	499	return -ENOMEM;
	500	if (dev->nostat && count < 12)
	501	return -ENOMEM;
	502	cmd = MIDI_CMD_CONTROL\|(ev->data.control.channel & 0x0f);
	503	bytes[0] = ev->data.control.param & 0x007f;
	504	bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
	505	bytes[2] = ev->data.control.value & 0x007f;
	506	bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
	507	if (cmd != dev->lastcmd && !dev->nostat) {
	508	if (count < 9)
	509	return -ENOMEM;
	510	buf[idx++] = dev->lastcmd = cmd;
	511	}
	512	cbytes = ev->type == SNDRV_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
	513	for (i = 0; i < 4; i++) {
	514	if (dev->nostat)
	515	buf[idx++] = dev->lastcmd = cmd;
	516	buf[idx++] = cbytes[i];
	517	buf[idx++] = bytes[i];
	518	}
	519	return idx;
	520	}
	521
	522	/*
	523	* exports
	524	*/
	525
	526	EXPORT_SYMBOL(snd_midi_event_new);
	527	EXPORT_SYMBOL(snd_midi_event_free);
1da177e4 LT	528	EXPORT_SYMBOL(snd_midi_event_reset_encode);
	529	EXPORT_SYMBOL(snd_midi_event_reset_decode);
	530	EXPORT_SYMBOL(snd_midi_event_no_status);
	531	EXPORT_SYMBOL(snd_midi_event_encode);
	532	EXPORT_SYMBOL(snd_midi_event_encode_byte);
	533	EXPORT_SYMBOL(snd_midi_event_decode);
	534
	535	static int __init alsa_seq_midi_event_init(void)
	536	{
	537	return 0;
	538	}
	539
	540	static void __exit alsa_seq_midi_event_exit(void)
	541	{
	542	}
	543
	544	module_init(alsa_seq_midi_event_init)
	545	module_exit(alsa_seq_midi_event_exit)