/* *  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 *//* status event types */typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);typedef void (*event_decode_t)(snd_seq_event_t *ev, unsigned char *buf);/* * prototypes */static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);static void note_decode(snd_seq_event_t *ev, unsigned char *buf);static void one_param_decode(snd_seq_event_t *ev, unsigned char *buf);static void pitchbend_decode(snd_seq_event_t *ev, unsigned char *buf);static void two_param_decode(snd_seq_event_t *ev, unsigned char *buf);static void songpos_decode(snd_seq_event_t *ev, unsigned char *buf);/* * event list */static struct status_event_list_t {	int event;	int qlen;	event_encode_t encode;	event_decode_t decode;} 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(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *ev);static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *ev);static struct extra_event_list_t {	int event;	int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, snd_seq_event_t *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, snd_midi_event_t **rdev){	snd_midi_event_t *dev;	*rdev = NULL;	dev = (snd_midi_event_t *)snd_kcalloc(sizeof(snd_midi_event_t), 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(snd_midi_event_t *dev){	if (dev != NULL) {		if (dev->buf)			kfree(dev->buf);		kfree(dev);	}}/* * initialize record */inline static void reset_encode(snd_midi_event_t *dev){	dev->read = 0;	dev->qlen = 0;	dev->type = 0;}void snd_midi_event_reset_encode(snd_midi_event_t *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(snd_midi_event_t *dev){	unsigned long flags;	spin_lock_irqsave(&dev->lock, flags);	dev->lastcmd = 0xff;	spin_unlock_irqrestore(&dev->lock, flags);}void snd_midi_event_init(snd_midi_event_t *dev){	snd_midi_event_reset_encode(dev);	snd_midi_event_reset_decode(dev);}void snd_midi_event_no_status(snd_midi_event_t *dev, int on){	dev->nostat = on ? 1 : 0;}/* * resize buffer */int snd_midi_event_resize_buffer(snd_midi_event_t *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);	if (old_buf)		kfree(old_buf);	return 0;}/* *  read bytes and encode to sequencer event if finished *  return the size of encoded bytes */long snd_midi_event_encode(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *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(snd_midi_event_t *dev, int c, snd_seq_event_t *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(snd_midi_event_t *dev, snd_seq_event_t *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(snd_midi_event_t *dev, snd_seq_event_t *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(snd_midi_event_t *dev, snd_seq_event_t *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(snd_midi_event_t *dev, snd_seq_event_t *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(snd_midi_event_t *dev, snd_seq_event_t *ev){	ev->data.control.value = dev->buf[1];}/* encode song position */static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *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(snd_midi_event_t *dev, unsigned char *buf, long count, snd_seq_event_t *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(snd_seq_event_t *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(snd_seq_event_t *ev, unsigned char *buf){	buf[0] = ev->data.control.value & 0x7f;}/* decode pitch wheel change */static void pitchbend_decode(snd_seq_event_t *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(snd_seq_event_t *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(snd_seq_event_t *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(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *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(snd_midi_event_t *dev, unsigned char *buf, int count, snd_seq_event_t *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_resize_buffer);EXPORT_SYMBOL(snd_midi_event_init);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);