540 lines
15 KiB
C
540 lines
15 KiB
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 */
|
||
|
|
|
||
|
|
|
||
|
|
/* 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 = kcalloc(1, 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(snd_midi_event_t *dev)
|
||
|
|
{
|
||
|
|
if (dev != NULL) {
|
||
|
|
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);
|
||
|
|
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);
|
||
|
|
|
||
|
|
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)
|