comparison plugin/api/dssi_alsa_compat.c @ 0:da6937383da8

initial import

+/* DSSI ALSA compatibility library
+ *
+ * This library provides for non-ALSA systems the ALSA snd_seq_event_t handling
+ * necessary to compile and run DSSI.  It was extracted from alsa-lib 1.0.8.
+ *
+ * See ./alsa/README for more information.
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+
+#include "alsa/asoundef.h"
+#include "alsa/sound/asequencer.h"
+#include "alsa/seq.h"
+#include "alsa/seq_event.h"
+#include "alsa/seq_midi_event.h"
+
+/**
+ * \file seq/seq_event.c
+ * \brief Sequencer Event Types
+ * \author Takashi Iwai <[e-mail]>
+ * \date 2001
+ */
+
+#define FIXED_EV(x)	(_SND_SEQ_TYPE(SND_SEQ_EVFLG_FIXED) | _SND_SEQ_TYPE(x))
+
+/** Event types conversion array */
+const unsigned int snd_seq_event_types[256] = {
+	[SND_SEQ_EVENT_SYSTEM ... SND_SEQ_EVENT_RESULT]
+	= FIXED_EV(SND_SEQ_EVFLG_RESULT),
+	[SND_SEQ_EVENT_NOTE]
+	= FIXED_EV(SND_SEQ_EVFLG_NOTE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_NOTE_TWOARG),
+	[SND_SEQ_EVENT_NOTEON ... SND_SEQ_EVENT_KEYPRESS]
+	= FIXED_EV(SND_SEQ_EVFLG_NOTE),
+	[SND_SEQ_EVENT_CONTROLLER ... SND_SEQ_EVENT_REGPARAM]
+	= FIXED_EV(SND_SEQ_EVFLG_CONTROL),
+	[SND_SEQ_EVENT_START ... SND_SEQ_EVENT_STOP]
+	= FIXED_EV(SND_SEQ_EVFLG_QUEUE),
+	[SND_SEQ_EVENT_SETPOS_TICK]
+	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TICK),
+	[SND_SEQ_EVENT_SETPOS_TIME]
+	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TIME),
+	[SND_SEQ_EVENT_TEMPO ... SND_SEQ_EVENT_SYNC_POS]
+	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_VALUE),
+	[SND_SEQ_EVENT_TUNE_REQUEST ... SND_SEQ_EVENT_SENSING]
+	= FIXED_EV(SND_SEQ_EVFLG_NONE),
+	[SND_SEQ_EVENT_ECHO ... SND_SEQ_EVENT_OSS]
+	= FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_SYSTEM),
+	[SND_SEQ_EVENT_CLIENT_START ... SND_SEQ_EVENT_PORT_CHANGE]
+	= FIXED_EV(SND_SEQ_EVFLG_MESSAGE),
+	[SND_SEQ_EVENT_PORT_SUBSCRIBED ... SND_SEQ_EVENT_PORT_UNSUBSCRIBED]
+	= FIXED_EV(SND_SEQ_EVFLG_CONNECTION),
+	[SND_SEQ_EVENT_SAMPLE ... SND_SEQ_EVENT_SAMPLE_PRIVATE1]
+	= FIXED_EV(SND_SEQ_EVFLG_SAMPLE),
+	[SND_SEQ_EVENT_USR0 ... SND_SEQ_EVENT_USR9]
+	= FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_USERS),
+	[SND_SEQ_EVENT_INSTR_BEGIN ... SND_SEQ_EVENT_INSTR_CHANGE]
+	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_INSTR) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARUSR),
+	[SND_SEQ_EVENT_SYSEX ... SND_SEQ_EVENT_BOUNCE]
+	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE),
+	[SND_SEQ_EVENT_USR_VAR0 ... SND_SEQ_EVENT_USR_VAR4]
+	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_USERS),
+	[SND_SEQ_EVENT_NONE]
+	= FIXED_EV(SND_SEQ_EVFLG_NONE),
+};
+
+/**
+ * \file seq/seq_midi_event.c
+ * \brief MIDI byte <-> sequencer event coder
+ * \author Takashi Iwai <[e-mail]>
+ * \author Jaroslav Kysela <[e-mail]>
+ * \date 2000-2001
+ */
+
+/*
+ *  MIDI byte <-> sequencer event coder
+ *
+ *  Copyright (C) 1998,99,2000 Takashi Iwai <[e-mail]>,
+ *			       Jaroslav Kysela <[e-mail]>
+ *
+ *
+ *   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
+ */
+
+/* midi status */
+struct snd_midi_event {
+	size_t qlen;	/* queue length */
+	size_t read;	/* chars read */
+	int type;	/* current event type */
+	unsigned char lastcmd;
+	unsigned char nostat;
+	size_t bufsize;
+	unsigned char *buf;	/* input buffer */
+};
+
+
+/* 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)(const 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(const snd_seq_event_t *ev, unsigned char *buf);
+static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
+static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf);
+static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
+static void songpos_decode(const 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 */
+	{SND_SEQ_EVENT_NOTEOFF,		2, note_event, note_decode},
+	{SND_SEQ_EVENT_NOTEON,		2, note_event, note_decode},
+	{SND_SEQ_EVENT_KEYPRESS,	2, note_event, note_decode},
+	{SND_SEQ_EVENT_CONTROLLER,	2, two_param_ctrl_event, two_param_decode},
+	{SND_SEQ_EVENT_PGMCHANGE,	1, one_param_ctrl_event, one_param_decode},
+	{SND_SEQ_EVENT_CHANPRESS,	1, one_param_ctrl_event, one_param_decode},
+	{SND_SEQ_EVENT_PITCHBEND,	2, pitchbend_ctrl_event, pitchbend_decode},
+	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf0 */
+	/* 0xf0 - 0xff */
+	{SND_SEQ_EVENT_SYSEX,		1, NULL, NULL}, /* sysex: 0xf0 */
+	{SND_SEQ_EVENT_QFRAME,		1, one_param_event, one_param_decode}, /* 0xf1 */
+	{SND_SEQ_EVENT_SONGPOS,		2, songpos_event, songpos_decode}, /* 0xf2 */
+	{SND_SEQ_EVENT_SONGSEL,		1, one_param_event, one_param_decode}, /* 0xf3 */
+	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf4 */
+	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf5 */
+	{SND_SEQ_EVENT_TUNE_REQUEST,	0, NULL, NULL},	/* 0xf6 */
+	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf7 */
+	{SND_SEQ_EVENT_CLOCK,		0, NULL, NULL}, /* 0xf8 */
+	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf9 */
+	{SND_SEQ_EVENT_START,		0, NULL, NULL}, /* 0xfa */
+	{SND_SEQ_EVENT_CONTINUE,	0, NULL, NULL}, /* 0xfb */
+	{SND_SEQ_EVENT_STOP, 		0, NULL, NULL}, /* 0xfc */
+	{SND_SEQ_EVENT_NONE, 		0, NULL, NULL}, /* 0xfd */
+	{SND_SEQ_EVENT_SENSING, 	0, NULL, NULL}, /* 0xfe */
+	{SND_SEQ_EVENT_RESET, 		0, NULL, NULL}, /* 0xff */
+};
+
+#ifdef UNNEEDED_BY_DSSI
+static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
+static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const 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, const snd_seq_event_t *ev);
+} extra_event[] = {
+	{SND_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
+	{SND_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
+	{SND_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
+};
+
+#define numberof(ary)	(sizeof(ary)/sizeof(ary[0]))
+#endif /* UNNEEDED_BY_DSSI */
+
+/**
+ * \brief Initialize MIDI event parser
+ * \param bufsize buffer size for MIDI message
+ * \param rdev allocated MIDI event parser
+ * \return 0 on success otherwise a negative error code
+ *
+ * Allocates and initializes MIDI event parser.
+ */
+int snd_midi_event_new(size_t bufsize, snd_midi_event_t **rdev)
+{
+	snd_midi_event_t *dev;
+
+	*rdev = NULL;
+	dev = (snd_midi_event_t *)calloc(1, sizeof(snd_midi_event_t));
+	if (dev == NULL)
+		return -ENOMEM;
+	if (bufsize > 0) {
+		dev->buf = malloc(bufsize);
+		if (dev->buf == NULL) {
+			free(dev);
+			return -ENOMEM;
+		}
+	}
+	dev->bufsize = bufsize;
+	dev->lastcmd = 0xff;
+	*rdev = dev;
+	return 0;
+}
+
+/**
+ * \brief Free MIDI event parser
+ * \param rdev MIDI event parser
+ * \return 0 on success otherwise a negative error code
+ *
+ * Frees MIDI event parser.
+ */
+void snd_midi_event_free(snd_midi_event_t *dev)
+{
+	if (dev != NULL) {
+		if (dev->buf)
+			free(dev->buf);
+		free(dev);
+	}
+}
+
+#ifdef UNNEEDED_BY_DSSI
+/**
+ * \brief Enable/disable MIDI command merging
+ * \param dev MIDI event parser
+ * \param on 0 - enable MIDI command merging, 1 - always pass the command
+ *
+ * Enable/disable MIDI command merging
+ */
+void snd_midi_event_no_status(snd_midi_event_t *dev, int on)
+{
+	dev->nostat = on ? 1 : 0;
+}
+#endif /* UNNEEDED_BY_DSSI */
+
+/*
+ * initialize record
+ */
+inline static void reset_encode(snd_midi_event_t *dev)
+{
+	dev->read = 0;
+	dev->qlen = 0;
+	dev->type = 0;
+}
+
+/**
+ * \brief Reset MIDI encode parser
+ * \param dev MIDI event parser
+ * \return 0 on success otherwise a negative error code
+ *
+ * Resets MIDI encode parser
+ */
+void snd_midi_event_reset_encode(snd_midi_event_t *dev)
+{
+	reset_encode(dev);
+}
+
+#ifdef UNNEEDED_BY_DSSI
+/**
+ * \brief Reset MIDI decode parser
+ * \param dev MIDI event parser
+ * \return 0 on success otherwise a negative error code
+ *
+ * Resets MIDI decode parser
+ */
+void snd_midi_event_reset_decode(snd_midi_event_t *dev)
+{
+	dev->lastcmd = 0xff;
+}
+
+/**
+ * \brief Initializes MIDI parsers
+ * \param dev MIDI event parser
+ * \return 0 on success otherwise a negative error code
+ *
+ * Initializes MIDI parsers (both encode and decode)
+ */
+void snd_midi_event_init(snd_midi_event_t *dev)
+{
+	snd_midi_event_reset_encode(dev);
+	snd_midi_event_reset_decode(dev);
+}
+
+/**
+ * \brief Resize MIDI message (event) buffer
+ * \param dev MIDI event parser
+ * \param bufsize new requested buffer size
+ * \return 0 on success otherwise a negative error code
+ *
+ * Resizes MIDI message (event) buffer.
+ */
+int snd_midi_event_resize_buffer(snd_midi_event_t *dev, size_t bufsize)
+{
+	unsigned char *new_buf, *old_buf;
+
+	if (bufsize == dev->bufsize)
+		return 0;
+	new_buf = malloc(bufsize);
+	if (new_buf == NULL)
+		return -ENOMEM;
+	old_buf = dev->buf;
+	dev->buf = new_buf;
+	dev->bufsize = bufsize;
+	reset_encode(dev);
+	if (old_buf)
+		free(old_buf);
+	return 0;
+}
+#endif /* UNNEEDED_BY_DSSI */
+
+/**
+ * \brief Read bytes and encode to sequencer event if finished
+ * \param dev MIDI event parser
+ * \param buf MIDI byte stream
+ * \param count count of bytes of MIDI byte stream to encode
+ * \param ev Result - sequencer event
+ * \return count of encoded bytes otherwise a negative error code
+ *
+ * Read bytes and encode to sequencer event if finished.
+ * If complete sequencer event is available, ev->type is not
+ * equal to #SND_SEQ_EVENT_NONE.
+ */
+long snd_midi_event_encode(snd_midi_event_t *dev, const unsigned char *buf, long count, snd_seq_event_t *ev)
+{
+	long result = 0;
+	int rc;
+
+	ev->type = SND_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;
+}
+
+/**
+ * \brief Read one byte and encode to sequencer event if finished
+ * \param dev MIDI event parser
+ * \param c a byte of MIDI stream
+ * \param ev Result - sequencer event
+ * \return 1 - sequencer event is completed, 0 - next byte is required for completion, otherwise a negative error code
+ *
+ * Read byte and encode to sequencer event if finished.
+ */
+int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
+{
+	int rc = 0;
+
+	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;
+	}
+
+	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;
+		}
+	}
+
+	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];
+}
+
+#ifdef UNNEEDED_BY_DSSI
+/**
+ * \brief Decode sequencer event to MIDI byte stream
+ * \param dev MIDI event parser
+ * \param buf Result - MIDI byte stream
+ * \param count Available bytes in MIDI byte stream
+ * \param ev Event to decode
+ * \return count of decoded bytes otherwise a negative error code
+ *
+ * Decode sequencer event to MIDI byte stream.
+ */
+long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, const snd_seq_event_t *ev)
+{
+	int cmd;
+	long qlen;
+	unsigned int type;
+
+	if (ev->type == SNDRV_SEQ_EVENT_NONE)
+		return -ENOENT;
+
+	for (type = 0; type < numberof(status_event); type++) {
+		if (ev->type == status_event[type].event)
+			goto __found;
+	}
+	for (type = 0; type < numberof(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) {
+		qlen = ev->data.ext.len;
+		if (count < qlen)
+			return -ENOMEM;
+		switch (ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) {
+		case SNDRV_SEQ_EVENT_LENGTH_FIXED:
+			return -EINVAL;	/* invalid event */
+		}
+		memcpy(buf, ev->data.ext.ptr, qlen);
+		return qlen;
+	} else {
+		unsigned char xbuf[4];
+
+		if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
+			dev->lastcmd = cmd;
+			xbuf[0] = cmd;
+			if (status_event[type].decode)
+				status_event[type].decode(ev, xbuf + 1);
+			qlen = status_event[type].qlen + 1;
+		} else {
+			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;
+	}
+}
+#endif /* UNNEEDED_BY_DSSI */
+
+/* decode note event */
+static void note_decode(const 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(const snd_seq_event_t *ev, unsigned char *buf)
+{
+	buf[0] = ev->data.control.value & 0x7f;
+}
+
+/* decode pitch wheel change */
+static void pitchbend_decode(const 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(const 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(const snd_seq_event_t *ev, unsigned char *buf)
+{
+	buf[0] = ev->data.control.value & 0x7f;
+	buf[1] = (ev->data.control.value >> 7) & 0x7f;
+}
+
+#ifdef UNNEEDED_BY_DSSI
+/* decode 14bit control */
+static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, const 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 < 32) {
+		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 + 32;
+		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, const 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 == SND_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;
+}
+#endif /* UNNEEDED_BY_DSSI */