Chris@0: /* DSSI ALSA compatibility library
Chris@0:  *
Chris@0:  * This library provides for non-ALSA systems the ALSA snd_seq_event_t handling
Chris@0:  * necessary to compile and run DSSI.  It was extracted from alsa-lib 1.0.8.
Chris@0:  *
Chris@0:  * See ./alsa/README for more information.
Chris@0:  */
Chris@0: 
Chris@0: #include <stdlib.h>
Chris@0: #include <errno.h>
Chris@0: 
Chris@0: #include "alsa/asoundef.h"
Chris@0: #include "alsa/sound/asequencer.h"
Chris@0: #include "alsa/seq.h"
Chris@0: #include "alsa/seq_event.h"
Chris@0: #include "alsa/seq_midi_event.h"
Chris@0: 
Chris@0: /**
Chris@0:  * \file seq/seq_event.c
Chris@0:  * \brief Sequencer Event Types
Chris@0:  * \author Takashi Iwai <tiwai@suse.de>
Chris@0:  * \date 2001
Chris@0:  */
Chris@0: 
Chris@0: #define FIXED_EV(x)	(_SND_SEQ_TYPE(SND_SEQ_EVFLG_FIXED) | _SND_SEQ_TYPE(x))
Chris@0: 
Chris@0: /** Event types conversion array */
Chris@0: const unsigned int snd_seq_event_types[256] = {
Chris@0: 	[SND_SEQ_EVENT_SYSTEM ... SND_SEQ_EVENT_RESULT]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_RESULT),
Chris@0: 	[SND_SEQ_EVENT_NOTE]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_NOTE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_NOTE_TWOARG),
Chris@0: 	[SND_SEQ_EVENT_NOTEON ... SND_SEQ_EVENT_KEYPRESS]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_NOTE),
Chris@0: 	[SND_SEQ_EVENT_CONTROLLER ... SND_SEQ_EVENT_REGPARAM]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_CONTROL),
Chris@0: 	[SND_SEQ_EVENT_START ... SND_SEQ_EVENT_STOP]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_QUEUE),
Chris@0: 	[SND_SEQ_EVENT_SETPOS_TICK]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TICK),
Chris@0: 	[SND_SEQ_EVENT_SETPOS_TIME]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_TIME),
Chris@0: 	[SND_SEQ_EVENT_TEMPO ... SND_SEQ_EVENT_SYNC_POS]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_QUEUE) | _SND_SEQ_TYPE_OPT(SND_SEQ_EVFLG_QUEUE_VALUE),
Chris@0: 	[SND_SEQ_EVENT_TUNE_REQUEST ... SND_SEQ_EVENT_SENSING]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_NONE),
Chris@0: 	[SND_SEQ_EVENT_ECHO ... SND_SEQ_EVENT_OSS]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_SYSTEM),
Chris@0: 	[SND_SEQ_EVENT_CLIENT_START ... SND_SEQ_EVENT_PORT_CHANGE]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_MESSAGE),
Chris@0: 	[SND_SEQ_EVENT_PORT_SUBSCRIBED ... SND_SEQ_EVENT_PORT_UNSUBSCRIBED]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_CONNECTION),
Chris@0: 	[SND_SEQ_EVENT_SAMPLE ... SND_SEQ_EVENT_SAMPLE_PRIVATE1]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_SAMPLE),
Chris@0: 	[SND_SEQ_EVENT_USR0 ... SND_SEQ_EVENT_USR9]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_RAW) | FIXED_EV(SND_SEQ_EVFLG_USERS),
Chris@0: 	[SND_SEQ_EVENT_INSTR_BEGIN ... SND_SEQ_EVENT_INSTR_CHANGE]
Chris@0: 	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_INSTR) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARUSR),
Chris@0: 	[SND_SEQ_EVENT_SYSEX ... SND_SEQ_EVENT_BOUNCE]
Chris@0: 	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE),
Chris@0: 	[SND_SEQ_EVENT_USR_VAR0 ... SND_SEQ_EVENT_USR_VAR4]
Chris@0: 	= _SND_SEQ_TYPE(SND_SEQ_EVFLG_VARIABLE) | _SND_SEQ_TYPE(SND_SEQ_EVFLG_USERS),
Chris@0: 	[SND_SEQ_EVENT_NONE]
Chris@0: 	= FIXED_EV(SND_SEQ_EVFLG_NONE),
Chris@0: };
Chris@0: 
Chris@0: /**
Chris@0:  * \file seq/seq_midi_event.c
Chris@0:  * \brief MIDI byte <-> sequencer event coder
Chris@0:  * \author Takashi Iwai <tiwai@suse.de>
Chris@0:  * \author Jaroslav Kysela <perex@suse.cz>
Chris@0:  * \date 2000-2001
Chris@0:  */
Chris@0: 
Chris@0: /*
Chris@0:  *  MIDI byte <-> sequencer event coder
Chris@0:  *
Chris@0:  *  Copyright (C) 1998,99,2000 Takashi Iwai <tiwai@suse.de>,
Chris@0:  *			       Jaroslav Kysela <perex@suse.cz>
Chris@0:  *
Chris@0:  *
Chris@0:  *   This library is free software; you can redistribute it and/or modify
Chris@0:  *   it under the terms of the GNU Lesser General Public License as
Chris@0:  *   published by the Free Software Foundation; either version 2.1 of
Chris@0:  *   the License, or (at your option) any later version.
Chris@0:  *
Chris@0:  *   This program is distributed in the hope that it will be useful,
Chris@0:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@0:  *   GNU Lesser General Public License for more details.
Chris@0:  *
Chris@0:  *   You should have received a copy of the GNU Lesser General Public
Chris@0:  *   License along with this library; if not, write to the Free Software
Chris@0:  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
Chris@0:  */
Chris@0: 
Chris@0: /* midi status */
Chris@0: struct snd_midi_event {
Chris@0: 	size_t qlen;	/* queue length */
Chris@0: 	size_t read;	/* chars read */
Chris@0: 	int type;	/* current event type */
Chris@0: 	unsigned char lastcmd;
Chris@0: 	unsigned char nostat;
Chris@0: 	size_t bufsize;
Chris@0: 	unsigned char *buf;	/* input buffer */
Chris@0: };
Chris@0: 
Chris@0: 
Chris@0: /* queue type */
Chris@0: /* from 0 to 7 are normal commands (note off, on, etc.) */
Chris@0: #define ST_NOTEOFF	0
Chris@0: #define ST_NOTEON	1
Chris@0: #define ST_SPECIAL	8
Chris@0: #define ST_SYSEX	ST_SPECIAL
Chris@0: /* from 8 to 15 are events for 0xf0-0xf7 */
Chris@0: 
Chris@0: 
Chris@0: /* status event types */
Chris@0: typedef void (*event_encode_t)(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: typedef void (*event_decode_t)(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: 
Chris@0: /*
Chris@0:  * prototypes
Chris@0:  */
Chris@0: static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev);
Chris@0: static void note_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf);
Chris@0: 
Chris@0: /*
Chris@0:  * event list
Chris@0:  */
Chris@0: static struct status_event_list_t {
Chris@0: 	int event;
Chris@0: 	int qlen;
Chris@0: 	event_encode_t encode;
Chris@0: 	event_decode_t decode;
Chris@0: } status_event[] = {
Chris@0: 	/* 0x80 - 0xf0 */
Chris@0: 	{SND_SEQ_EVENT_NOTEOFF,		2, note_event, note_decode},
Chris@0: 	{SND_SEQ_EVENT_NOTEON,		2, note_event, note_decode},
Chris@0: 	{SND_SEQ_EVENT_KEYPRESS,	2, note_event, note_decode},
Chris@0: 	{SND_SEQ_EVENT_CONTROLLER,	2, two_param_ctrl_event, two_param_decode},
Chris@0: 	{SND_SEQ_EVENT_PGMCHANGE,	1, one_param_ctrl_event, one_param_decode},
Chris@0: 	{SND_SEQ_EVENT_CHANPRESS,	1, one_param_ctrl_event, one_param_decode},
Chris@0: 	{SND_SEQ_EVENT_PITCHBEND,	2, pitchbend_ctrl_event, pitchbend_decode},
Chris@0: 	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf0 */
Chris@0: 	/* 0xf0 - 0xff */
Chris@0: 	{SND_SEQ_EVENT_SYSEX,		1, NULL, NULL}, /* sysex: 0xf0 */
Chris@0: 	{SND_SEQ_EVENT_QFRAME,		1, one_param_event, one_param_decode}, /* 0xf1 */
Chris@0: 	{SND_SEQ_EVENT_SONGPOS,		2, songpos_event, songpos_decode}, /* 0xf2 */
Chris@0: 	{SND_SEQ_EVENT_SONGSEL,		1, one_param_event, one_param_decode}, /* 0xf3 */
Chris@0: 	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf4 */
Chris@0: 	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf5 */
Chris@0: 	{SND_SEQ_EVENT_TUNE_REQUEST,	0, NULL, NULL},	/* 0xf6 */
Chris@0: 	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf7 */
Chris@0: 	{SND_SEQ_EVENT_CLOCK,		0, NULL, NULL}, /* 0xf8 */
Chris@0: 	{SND_SEQ_EVENT_NONE,		0, NULL, NULL}, /* 0xf9 */
Chris@0: 	{SND_SEQ_EVENT_START,		0, NULL, NULL}, /* 0xfa */
Chris@0: 	{SND_SEQ_EVENT_CONTINUE,	0, NULL, NULL}, /* 0xfb */
Chris@0: 	{SND_SEQ_EVENT_STOP, 		0, NULL, NULL}, /* 0xfc */
Chris@0: 	{SND_SEQ_EVENT_NONE, 		0, NULL, NULL}, /* 0xfd */
Chris@0: 	{SND_SEQ_EVENT_SENSING, 	0, NULL, NULL}, /* 0xfe */
Chris@0: 	{SND_SEQ_EVENT_RESET, 		0, NULL, NULL}, /* 0xff */
Chris@0: };
Chris@0: 
Chris@0: #ifdef UNNEEDED_BY_DSSI
Chris@0: static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
Chris@0: static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev);
Chris@0: 
Chris@0: static struct extra_event_list_t {
Chris@0: 	int event;
Chris@0: 	int (*decode)(snd_midi_event_t *dev, unsigned char *buf, int len, const snd_seq_event_t *ev);
Chris@0: } extra_event[] = {
Chris@0: 	{SND_SEQ_EVENT_CONTROL14, extra_decode_ctrl14},
Chris@0: 	{SND_SEQ_EVENT_NONREGPARAM, extra_decode_xrpn},
Chris@0: 	{SND_SEQ_EVENT_REGPARAM, extra_decode_xrpn},
Chris@0: };
Chris@0: 
Chris@0: #define numberof(ary)	(sizeof(ary)/sizeof(ary[0]))
Chris@0: #endif /* UNNEEDED_BY_DSSI */
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Initialize MIDI event parser
Chris@0:  * \param bufsize buffer size for MIDI message
Chris@0:  * \param rdev allocated MIDI event parser
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Allocates and initializes MIDI event parser.
Chris@0:  */
Chris@0: int snd_midi_event_new(size_t bufsize, snd_midi_event_t **rdev)
Chris@0: {
Chris@0: 	snd_midi_event_t *dev;
Chris@0: 
Chris@0: 	*rdev = NULL;
Chris@0: 	dev = (snd_midi_event_t *)calloc(1, sizeof(snd_midi_event_t));
Chris@0: 	if (dev == NULL)
Chris@0: 		return -ENOMEM;
Chris@0: 	if (bufsize > 0) {
Chris@0: 		dev->buf = malloc(bufsize);
Chris@0: 		if (dev->buf == NULL) {
Chris@0: 			free(dev);
Chris@0: 			return -ENOMEM;
Chris@0: 		}
Chris@0: 	}
Chris@0: 	dev->bufsize = bufsize;
Chris@0: 	dev->lastcmd = 0xff;
Chris@0: 	*rdev = dev;
Chris@0: 	return 0;
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Free MIDI event parser
Chris@0:  * \param rdev MIDI event parser
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Frees MIDI event parser.
Chris@0:  */
Chris@0: void snd_midi_event_free(snd_midi_event_t *dev)
Chris@0: {
Chris@0: 	if (dev != NULL) {
Chris@0: 		if (dev->buf)
Chris@0: 			free(dev->buf);
Chris@0: 		free(dev);
Chris@0: 	}
Chris@0: }
Chris@0: 
Chris@0: #ifdef UNNEEDED_BY_DSSI
Chris@0: /**
Chris@0:  * \brief Enable/disable MIDI command merging
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \param on 0 - enable MIDI command merging, 1 - always pass the command
Chris@0:  *
Chris@0:  * Enable/disable MIDI command merging
Chris@0:  */
Chris@0: void snd_midi_event_no_status(snd_midi_event_t *dev, int on)
Chris@0: {
Chris@0: 	dev->nostat = on ? 1 : 0;
Chris@0: }
Chris@0: #endif /* UNNEEDED_BY_DSSI */
Chris@0: 
Chris@0: /*
Chris@0:  * initialize record
Chris@0:  */
Chris@0: inline static void reset_encode(snd_midi_event_t *dev)
Chris@0: {
Chris@0: 	dev->read = 0;
Chris@0: 	dev->qlen = 0;
Chris@0: 	dev->type = 0;
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Reset MIDI encode parser
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Resets MIDI encode parser
Chris@0:  */
Chris@0: void snd_midi_event_reset_encode(snd_midi_event_t *dev)
Chris@0: {
Chris@0: 	reset_encode(dev);
Chris@0: }
Chris@0: 
Chris@0: #ifdef UNNEEDED_BY_DSSI
Chris@0: /**
Chris@0:  * \brief Reset MIDI decode parser
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Resets MIDI decode parser
Chris@0:  */
Chris@0: void snd_midi_event_reset_decode(snd_midi_event_t *dev)
Chris@0: {
Chris@0: 	dev->lastcmd = 0xff;
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Initializes MIDI parsers
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Initializes MIDI parsers (both encode and decode)
Chris@0:  */
Chris@0: void snd_midi_event_init(snd_midi_event_t *dev)
Chris@0: {
Chris@0: 	snd_midi_event_reset_encode(dev);
Chris@0: 	snd_midi_event_reset_decode(dev);
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Resize MIDI message (event) buffer
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \param bufsize new requested buffer size
Chris@0:  * \return 0 on success otherwise a negative error code
Chris@0:  *
Chris@0:  * Resizes MIDI message (event) buffer.
Chris@0:  */
Chris@0: int snd_midi_event_resize_buffer(snd_midi_event_t *dev, size_t bufsize)
Chris@0: {
Chris@0: 	unsigned char *new_buf, *old_buf;
Chris@0: 
Chris@0: 	if (bufsize == dev->bufsize)
Chris@0: 		return 0;
Chris@0: 	new_buf = malloc(bufsize);
Chris@0: 	if (new_buf == NULL)
Chris@0: 		return -ENOMEM;
Chris@0: 	old_buf = dev->buf;
Chris@0: 	dev->buf = new_buf;
Chris@0: 	dev->bufsize = bufsize;
Chris@0: 	reset_encode(dev);
Chris@0: 	if (old_buf)
Chris@0: 		free(old_buf);
Chris@0: 	return 0;
Chris@0: }
Chris@0: #endif /* UNNEEDED_BY_DSSI */
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Read bytes and encode to sequencer event if finished
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \param buf MIDI byte stream
Chris@0:  * \param count count of bytes of MIDI byte stream to encode
Chris@0:  * \param ev Result - sequencer event
Chris@0:  * \return count of encoded bytes otherwise a negative error code
Chris@0:  *
Chris@0:  * Read bytes and encode to sequencer event if finished.
Chris@0:  * If complete sequencer event is available, ev->type is not
Chris@0:  * equal to #SND_SEQ_EVENT_NONE.
Chris@0:  */
Chris@0: long snd_midi_event_encode(snd_midi_event_t *dev, const unsigned char *buf, long count, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	long result = 0;
Chris@0: 	int rc;
Chris@0: 
Chris@0: 	ev->type = SND_SEQ_EVENT_NONE;
Chris@0: 
Chris@0: 	while (count-- > 0) {
Chris@0: 		rc = snd_midi_event_encode_byte(dev, *buf++, ev);
Chris@0: 		result++;
Chris@0: 		if (rc < 0)
Chris@0: 			return rc;
Chris@0: 		else if (rc > 0)
Chris@0: 			return result;
Chris@0: 	}
Chris@0: 
Chris@0: 	return result;
Chris@0: }
Chris@0: 
Chris@0: /**
Chris@0:  * \brief Read one byte and encode to sequencer event if finished
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \param c a byte of MIDI stream
Chris@0:  * \param ev Result - sequencer event
Chris@0:  * \return 1 - sequencer event is completed, 0 - next byte is required for completion, otherwise a negative error code
Chris@0:  *
Chris@0:  * Read byte and encode to sequencer event if finished.
Chris@0:  */
Chris@0: int snd_midi_event_encode_byte(snd_midi_event_t *dev, int c, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	int rc = 0;
Chris@0: 
Chris@0: 	c &= 0xff;
Chris@0: 
Chris@0: 	if (c >= MIDI_CMD_COMMON_CLOCK) {
Chris@0: 		/* real-time event */
Chris@0: 		ev->type = status_event[ST_SPECIAL + c - 0xf0].event;
Chris@0: 		ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0: 		ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
Chris@0: 		return 1;
Chris@0: 	}
Chris@0: 
Chris@0: 	if (dev->qlen > 0) {
Chris@0: 		/* rest of command */
Chris@0: 		dev->buf[dev->read++] = c;
Chris@0: 		if (dev->type != ST_SYSEX)
Chris@0: 			dev->qlen--;
Chris@0: 	} else {
Chris@0: 		/* new command */
Chris@0: 		dev->read = 1;
Chris@0: 		if (c & 0x80) {
Chris@0: 			dev->buf[0] = c;
Chris@0: 			if ((c & 0xf0) == 0xf0) /* special events */
Chris@0: 				dev->type = (c & 0x0f) + ST_SPECIAL;
Chris@0: 			else
Chris@0: 				dev->type = (c >> 4) & 0x07;
Chris@0: 			dev->qlen = status_event[dev->type].qlen;
Chris@0: 		} else {
Chris@0: 			/* process this byte as argument */
Chris@0: 			dev->buf[dev->read++] = c;
Chris@0: 			dev->qlen = status_event[dev->type].qlen - 1;
Chris@0: 		}
Chris@0: 	}
Chris@0: 	if (dev->qlen == 0) {
Chris@0: 		ev->type = status_event[dev->type].event;
Chris@0: 		ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0: 		ev->flags |= SNDRV_SEQ_EVENT_LENGTH_FIXED;
Chris@0: 		if (status_event[dev->type].encode) /* set data values */
Chris@0: 			status_event[dev->type].encode(dev, ev);
Chris@0: 		rc = 1;
Chris@0: 	} else 	if (dev->type == ST_SYSEX) {
Chris@0: 		if (c == MIDI_CMD_COMMON_SYSEX_END ||
Chris@0: 		    dev->read >= dev->bufsize) {
Chris@0: 			ev->flags &= ~SNDRV_SEQ_EVENT_LENGTH_MASK;
Chris@0: 			ev->flags |= SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
Chris@0: 			ev->type = SNDRV_SEQ_EVENT_SYSEX;
Chris@0: 			ev->data.ext.len = dev->read;
Chris@0: 			ev->data.ext.ptr = dev->buf;
Chris@0: 			if (c != MIDI_CMD_COMMON_SYSEX_END)
Chris@0: 				dev->read = 0; /* continue to parse */
Chris@0: 			else
Chris@0: 				reset_encode(dev); /* all parsed */
Chris@0: 			rc = 1;
Chris@0: 		}
Chris@0: 	}
Chris@0: 
Chris@0: 	return rc;
Chris@0: }
Chris@0: 
Chris@0: /* encode note event */
Chris@0: static void note_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.note.channel = dev->buf[0] & 0x0f;
Chris@0: 	ev->data.note.note = dev->buf[1];
Chris@0: 	ev->data.note.velocity = dev->buf[2];
Chris@0: }
Chris@0: 
Chris@0: /* encode one parameter controls */
Chris@0: static void one_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0: 	ev->data.control.value = dev->buf[1];
Chris@0: }
Chris@0: 
Chris@0: /* encode pitch wheel change */
Chris@0: static void pitchbend_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0: 	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1] - 8192;
Chris@0: }
Chris@0: 
Chris@0: /* encode midi control change */
Chris@0: static void two_param_ctrl_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.control.channel = dev->buf[0] & 0x0f;
Chris@0: 	ev->data.control.param = dev->buf[1];
Chris@0: 	ev->data.control.value = dev->buf[2];
Chris@0: }
Chris@0: 
Chris@0: /* encode one parameter value*/
Chris@0: static void one_param_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.control.value = dev->buf[1];
Chris@0: }
Chris@0: 
Chris@0: /* encode song position */
Chris@0: static void songpos_event(snd_midi_event_t *dev, snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	ev->data.control.value = (int)dev->buf[2] * 128 + (int)dev->buf[1];
Chris@0: }
Chris@0: 
Chris@0: #ifdef UNNEEDED_BY_DSSI
Chris@0: /**
Chris@0:  * \brief Decode sequencer event to MIDI byte stream
Chris@0:  * \param dev MIDI event parser
Chris@0:  * \param buf Result - MIDI byte stream
Chris@0:  * \param count Available bytes in MIDI byte stream
Chris@0:  * \param ev Event to decode
Chris@0:  * \return count of decoded bytes otherwise a negative error code
Chris@0:  *
Chris@0:  * Decode sequencer event to MIDI byte stream.
Chris@0:  */
Chris@0: long snd_midi_event_decode(snd_midi_event_t *dev, unsigned char *buf, long count, const snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	int cmd;
Chris@0: 	long qlen;
Chris@0: 	unsigned int type;
Chris@0: 
Chris@0: 	if (ev->type == SNDRV_SEQ_EVENT_NONE)
Chris@0: 		return -ENOENT;
Chris@0: 
Chris@0: 	for (type = 0; type < numberof(status_event); type++) {
Chris@0: 		if (ev->type == status_event[type].event)
Chris@0: 			goto __found;
Chris@0: 	}
Chris@0: 	for (type = 0; type < numberof(extra_event); type++) {
Chris@0: 		if (ev->type == extra_event[type].event)
Chris@0: 			return extra_event[type].decode(dev, buf, count, ev);
Chris@0: 	}
Chris@0: 	return -ENOENT;
Chris@0: 
Chris@0:       __found:
Chris@0: 	if (type >= ST_SPECIAL)
Chris@0: 		cmd = 0xf0 + (type - ST_SPECIAL);
Chris@0: 	else
Chris@0: 		/* data.note.channel and data.control.channel is identical */
Chris@0: 		cmd = 0x80 | (type << 4) | (ev->data.note.channel & 0x0f);
Chris@0: 
Chris@0: 
Chris@0: 	if (cmd == MIDI_CMD_COMMON_SYSEX) {
Chris@0: 		qlen = ev->data.ext.len;
Chris@0: 		if (count < qlen)
Chris@0: 			return -ENOMEM;
Chris@0: 		switch (ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) {
Chris@0: 		case SNDRV_SEQ_EVENT_LENGTH_FIXED:
Chris@0: 			return -EINVAL;	/* invalid event */
Chris@0: 		}
Chris@0: 		memcpy(buf, ev->data.ext.ptr, qlen);
Chris@0: 		return qlen;
Chris@0: 	} else {
Chris@0: 		unsigned char xbuf[4];
Chris@0: 
Chris@0: 		if ((cmd & 0xf0) == 0xf0 || dev->lastcmd != cmd || dev->nostat) {
Chris@0: 			dev->lastcmd = cmd;
Chris@0: 			xbuf[0] = cmd;
Chris@0: 			if (status_event[type].decode)
Chris@0: 				status_event[type].decode(ev, xbuf + 1);
Chris@0: 			qlen = status_event[type].qlen + 1;
Chris@0: 		} else {
Chris@0: 			if (status_event[type].decode)
Chris@0: 				status_event[type].decode(ev, xbuf + 0);
Chris@0: 			qlen = status_event[type].qlen;
Chris@0: 		}
Chris@0: 		if (count < qlen)
Chris@0: 			return -ENOMEM;
Chris@0: 		memcpy(buf, xbuf, qlen);
Chris@0: 		return qlen;
Chris@0: 	}
Chris@0: }
Chris@0: #endif /* UNNEEDED_BY_DSSI */
Chris@0: 
Chris@0: /* decode note event */
Chris@0: static void note_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0: {
Chris@0: 	buf[0] = ev->data.note.note & 0x7f;
Chris@0: 	buf[1] = ev->data.note.velocity & 0x7f;
Chris@0: }
Chris@0: 
Chris@0: /* decode one parameter controls */
Chris@0: static void one_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0: {
Chris@0: 	buf[0] = ev->data.control.value & 0x7f;
Chris@0: }
Chris@0: 
Chris@0: /* decode pitch wheel change */
Chris@0: static void pitchbend_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0: {
Chris@0: 	int value = ev->data.control.value + 8192;
Chris@0: 	buf[0] = value & 0x7f;
Chris@0: 	buf[1] = (value >> 7) & 0x7f;
Chris@0: }
Chris@0: 
Chris@0: /* decode midi control change */
Chris@0: static void two_param_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0: {
Chris@0: 	buf[0] = ev->data.control.param & 0x7f;
Chris@0: 	buf[1] = ev->data.control.value & 0x7f;
Chris@0: }
Chris@0: 
Chris@0: /* decode song position */
Chris@0: static void songpos_decode(const snd_seq_event_t *ev, unsigned char *buf)
Chris@0: {
Chris@0: 	buf[0] = ev->data.control.value & 0x7f;
Chris@0: 	buf[1] = (ev->data.control.value >> 7) & 0x7f;
Chris@0: }
Chris@0: 
Chris@0: #ifdef UNNEEDED_BY_DSSI
Chris@0: /* decode 14bit control */
Chris@0: static int extra_decode_ctrl14(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	unsigned char cmd;
Chris@0: 	int idx = 0;
Chris@0: 
Chris@0: 	cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
Chris@0: 	if (ev->data.control.param < 32) {
Chris@0: 		if (count < 4)
Chris@0: 			return -ENOMEM;
Chris@0: 		if (dev->nostat && count < 6)
Chris@0: 			return -ENOMEM;
Chris@0: 		if (cmd != dev->lastcmd || dev->nostat) {
Chris@0: 			if (count < 5)
Chris@0: 				return -ENOMEM;
Chris@0: 			buf[idx++] = dev->lastcmd = cmd;
Chris@0: 		}
Chris@0: 		buf[idx++] = ev->data.control.param;
Chris@0: 		buf[idx++] = (ev->data.control.value >> 7) & 0x7f;
Chris@0: 		if (dev->nostat)
Chris@0: 			buf[idx++] = cmd;
Chris@0: 		buf[idx++] = ev->data.control.param + 32;
Chris@0: 		buf[idx++] = ev->data.control.value & 0x7f;
Chris@0: 	} else {
Chris@0: 		if (count < 2)
Chris@0: 			return -ENOMEM;
Chris@0: 		if (cmd != dev->lastcmd || dev->nostat) {
Chris@0: 			if (count < 3)
Chris@0: 				return -ENOMEM;
Chris@0: 			buf[idx++] = dev->lastcmd = cmd;
Chris@0: 		}
Chris@0: 		buf[idx++] = ev->data.control.param & 0x7f;
Chris@0: 		buf[idx++] = ev->data.control.value & 0x7f;
Chris@0: 	}
Chris@0: 	return idx;
Chris@0: }
Chris@0: 
Chris@0: /* decode reg/nonreg param */
Chris@0: static int extra_decode_xrpn(snd_midi_event_t *dev, unsigned char *buf, int count, const snd_seq_event_t *ev)
Chris@0: {
Chris@0: 	unsigned char cmd;
Chris@0: 	char *cbytes;
Chris@0: 	static char cbytes_nrpn[4] = { MIDI_CTL_NONREG_PARM_NUM_MSB,
Chris@0: 				       MIDI_CTL_NONREG_PARM_NUM_LSB,
Chris@0: 				       MIDI_CTL_MSB_DATA_ENTRY,
Chris@0: 				       MIDI_CTL_LSB_DATA_ENTRY };
Chris@0: 	static char cbytes_rpn[4] =  { MIDI_CTL_REGIST_PARM_NUM_MSB,
Chris@0: 				       MIDI_CTL_REGIST_PARM_NUM_LSB,
Chris@0: 				       MIDI_CTL_MSB_DATA_ENTRY,
Chris@0: 				       MIDI_CTL_LSB_DATA_ENTRY };
Chris@0: 	unsigned char bytes[4];
Chris@0: 	int idx = 0, i;
Chris@0: 
Chris@0: 	if (count < 8)
Chris@0: 		return -ENOMEM;
Chris@0: 	if (dev->nostat && count < 12)
Chris@0: 		return -ENOMEM;
Chris@0: 	cmd = MIDI_CMD_CONTROL|(ev->data.control.channel & 0x0f);
Chris@0: 	bytes[0] = ev->data.control.param & 0x007f;
Chris@0: 	bytes[1] = (ev->data.control.param & 0x3f80) >> 7;
Chris@0: 	bytes[2] = ev->data.control.value & 0x007f;
Chris@0: 	bytes[3] = (ev->data.control.value & 0x3f80) >> 7;
Chris@0: 	if (cmd != dev->lastcmd && !dev->nostat) {
Chris@0: 		if (count < 9)
Chris@0: 			return -ENOMEM;
Chris@0: 		buf[idx++] = dev->lastcmd = cmd;
Chris@0: 	}
Chris@0: 	cbytes = ev->type == SND_SEQ_EVENT_NONREGPARAM ? cbytes_nrpn : cbytes_rpn;
Chris@0: 	for (i = 0; i < 4; i++) {
Chris@0: 		if (dev->nostat)
Chris@0: 			buf[idx++] = dev->lastcmd = cmd;
Chris@0: 		buf[idx++] = cbytes[i];
Chris@0: 		buf[idx++] = bytes[i];
Chris@0: 	}
Chris@0: 	return idx;
Chris@0: }
Chris@0: #endif /* UNNEEDED_BY_DSSI */