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sequencer.c
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/*
* sound/sequencer.c
*
* The sequencer personality manager.
*
* Copyright by Hannu Savolainen 1993
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer. 2.
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#define SEQUENCER_C
#include "sound_config.h"
#ifdef CONFIGURE_SOUNDCARD
#ifndef EXCLUDE_SEQUENCER
static int sequencer_ok = 0;
DEFINE_WAIT_QUEUE (seq_sleeper, seq_sleep_flag);
/* DEFINE_WAIT_QUEUE (midi_sleeper, midi_sleep_flag); */
#define midi_sleeper seq_sleeper
#define midi_sleep_flag seq_sleep_flag
static int midi_opened[MAX_MIDI_DEV] =
{0}; /* 1 if the process has opened MIDI */
static int midi_written[MAX_MIDI_DEV] =
{0};
long seq_time = 0; /* Reference point for the timer */
#include "tuning.h"
#define EV_SZ 8
#define IEV_SZ 4
static unsigned char *queue = NULL; /* SEQ_MAX_QUEUE * EV_SZ bytes */
static unsigned char *iqueue = NULL; /* SEQ_MAX_QUEUE * IEV_SZ bytes */
static volatile int qhead = 0, qtail = 0, qlen = 0;
static volatile int iqhead = 0, iqtail = 0, iqlen = 0;
static volatile int seq_playing = 0;
static int sequencer_busy = 0;
static int output_treshold;
static unsigned synth_open_mask;
static int seq_queue (unsigned char *note);
static void seq_startplay (void);
static int seq_sync (void);
static void seq_reset (void);
static int pmgr_present[MAX_SYNTH_DEV] =
{0};
#if MAX_SYNTH_DEV > 15
#error Too many synthesizer devices
#endif
int
sequencer_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
{
int c = count, p = 0;
dev = dev >> 4;
if (dev) /* Patch manager device */
return pmgr_read (dev - 1, file, buf, count);
while (c > 3)
{
if (!iqlen)
{
DO_SLEEP (midi_sleeper, midi_sleep_flag, 0);
if (!iqlen)
return count - c;
}
COPY_TO_USER (buf, p, &iqueue[iqhead * IEV_SZ], IEV_SZ);
p += 4;
c -= 4;
iqhead = (iqhead + 1) % SEQ_MAX_QUEUE;
iqlen--;
}
return count - c;
}
static void
sequencer_midi_output (int dev)
{
/* Currently NOP */
}
static void
copy_to_input (unsigned char *event)
{
unsigned long flags;
if (iqlen >= (SEQ_MAX_QUEUE - 1))
return; /* Overflow */
memcpy (&iqueue[iqtail * IEV_SZ], event, IEV_SZ);
iqlen++;
iqtail = (iqtail + 1) % SEQ_MAX_QUEUE;
DISABLE_INTR (flags);
if (SOMEONE_WAITING (midi_sleeper, midi_sleep_flag))
{
WAKE_UP (midi_sleeper, midi_sleep_flag);
}
RESTORE_INTR (flags);
}
static void
sequencer_midi_input (int dev, unsigned char data)
{
int tstamp;
unsigned char event[4];
if (data == 0xfe) /* Active sensing */
return; /* Ignore */
tstamp = GET_TIME () - seq_time; /* Time since open() */
tstamp = (tstamp << 8) | SEQ_WAIT;
copy_to_input ((unsigned char *) &tstamp);
event[0] = SEQ_MIDIPUTC;
event[1] = data;
event[2] = dev;
event[3] = 0;
copy_to_input (event);
}
int
sequencer_write (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
{
unsigned char event[EV_SZ], ev_code;
int p = 0, c, ev_size;
int err;
int mode = file->mode & O_ACCMODE;
dev = dev >> 4;
DEB (printk ("sequencer_write(dev=%d, count=%d)\n", dev, count));
if (mode == OPEN_READ)
return RET_ERROR (EIO);
if (dev) /* Patch manager device */
return pmgr_write (dev - 1, file, buf, count);
c = count;
while (c >= 4)
{
COPY_FROM_USER (event, buf, p, 4);
ev_code = event[0];
if (ev_code == SEQ_FULLSIZE)
{
int err;
dev = *(unsigned short *) &event[2];
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)))
return RET_ERROR (ENXIO);
err = synth_devs[dev]->load_patch (dev, *(short *) &event[0], buf, p + 4, c, 0);
if (err < 0)
return err;
return err;
}
if (ev_code == SEQ_EXTENDED || ev_code == SEQ_PRIVATE)
{
ev_size = 8;
if (c < ev_size)
{
if (!seq_playing)
seq_startplay ();
return count - c;
}
COPY_FROM_USER (&event[4], buf, p + 4, 4);
}
else
ev_size = 4;
if (event[0] == SEQ_MIDIPUTC)
{
if (!midi_opened[event[2]])
{
int mode;
int dev = event[2];
if (dev >= num_midis)
{
printk ("Sequencer Error: Nonexistent MIDI device %d\n", dev);
return RET_ERROR (ENXIO);
}
mode = file->mode & O_ACCMODE;
if ((err = midi_devs[dev]->open (dev, mode,
sequencer_midi_input, sequencer_midi_output)) < 0)
{
seq_reset ();
printk ("Sequencer Error: Unable to open Midi #%d\n", dev);
return err;
}
midi_opened[dev] = 1;
}
}
if (!seq_queue (event))
{
if (!seq_playing)
seq_startplay ();
return count - c;
}
p += ev_size;
c -= ev_size;
}
if (!seq_playing)
seq_startplay ();
return count;
}
static int
seq_queue (unsigned char *note)
{
/* Test if there is space in the queue */
if (qlen >= SEQ_MAX_QUEUE)
if (!seq_playing)
seq_startplay (); /* Give chance to drain the queue */
if (qlen >= SEQ_MAX_QUEUE && !SOMEONE_WAITING (seq_sleeper, seq_sleep_flag))
{
/* Sleep until there is enough space on the queue */
DO_SLEEP (seq_sleeper, seq_sleep_flag, 0);
}
if (qlen >= SEQ_MAX_QUEUE)
return 0; /* To be sure */
memcpy (&queue[qtail * EV_SZ], note, EV_SZ);
qtail = (qtail + 1) % SEQ_MAX_QUEUE;
qlen++;
return 1;
}
static int
extended_event (unsigned char *q)
{
int dev = q[2];
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)))
return RET_ERROR (ENXIO);
switch (q[1])
{
case SEQ_NOTEOFF:
synth_devs[dev]->kill_note (dev, q[3], q[5]);
break;
case SEQ_NOTEON:
if (q[4] > 127 && q[4] != 255)
return 0;
synth_devs[dev]->start_note (dev, q[3], q[4], q[5]);
break;
case SEQ_PGMCHANGE:
synth_devs[dev]->set_instr (dev, q[3], q[4]);
break;
case SEQ_AFTERTOUCH:
synth_devs[dev]->aftertouch (dev, q[3], q[4]);
break;
case SEQ_BALANCE:
synth_devs[dev]->panning (dev, q[3], (char) q[4]);
break;
case SEQ_CONTROLLER:
synth_devs[dev]->controller (dev, q[3], q[4], *(short *) &q[5]);
break;
default:
return RET_ERROR (EINVAL);
}
return 0;
}
static void
seq_startplay (void)
{
int this_one;
unsigned long *delay;
unsigned char *q;
while (qlen > 0)
{
qhead = ((this_one = qhead) + 1) % SEQ_MAX_QUEUE;
qlen--;
q = &queue[this_one*EV_SZ];
switch (q[0])
{
case SEQ_NOTEOFF:
if (synth_open_mask & (1 << 0))
if (synth_devs[0])
synth_devs[0]->kill_note (0, q[1], q[3]);
break;
case SEQ_NOTEON:
if (q[4] < 128 || q[4] == 255)
if (synth_open_mask & (1 << 0))
if (synth_devs[0])
synth_devs[0]->start_note (0, q[1], q[2], q[3]);
break;
case SEQ_WAIT:
delay = (unsigned long *) q; /* Bytes 1 to 3 are containing the
* delay in GET_TIME() */
*delay = (*delay >> 8) & 0xffffff;
if (*delay > 0)
{
long time;
seq_playing = 1;
time = *delay;
request_sound_timer (time);
if ((SEQ_MAX_QUEUE - qlen) >= output_treshold)
{
unsigned long flags;
DISABLE_INTR (flags);
if (SOMEONE_WAITING (seq_sleeper, seq_sleep_flag))
{
WAKE_UP (seq_sleeper, seq_sleep_flag);
}
RESTORE_INTR (flags);
}
return; /* Stop here. Timer routine will continue
* playing after the delay */
}
break;
case SEQ_PGMCHANGE:
if (synth_open_mask & (1 << 0))
if (synth_devs[0])
synth_devs[0]->set_instr (0, q[1], q[2]);
break;
case SEQ_SYNCTIMER: /* Reset timer */
seq_time = GET_TIME ();
break;
case SEQ_MIDIPUTC: /* Put a midi character */
if (midi_opened[q[2]])
{
int dev;
dev = q[2];
if (!midi_devs[dev]->putc (dev, q[1]))
{
/*
* Output FIFO is full. Wait one timer cycle and try again.
*/
qlen++;
qhead = this_one; /* Restore queue */
seq_playing = 1;
request_sound_timer (-1);
return;
}
else
midi_written[dev] = 1;
}
break;
case SEQ_ECHO:
copy_to_input (q); /* Echo back to the process */
break;
case SEQ_PRIVATE:
if (q[1] < num_synths)
synth_devs[q[1]]->hw_control (q[1], q);
break;
case SEQ_EXTENDED:
extended_event (q);
break;
default:;
}
}
seq_playing = 0;
if ((SEQ_MAX_QUEUE - qlen) >= output_treshold)
{
unsigned long flags;
DISABLE_INTR (flags);
if (SOMEONE_WAITING (seq_sleeper, seq_sleep_flag))
{
WAKE_UP (seq_sleeper, seq_sleep_flag);
}
RESTORE_INTR (flags);
}
}
int
sequencer_open (int dev, struct fileinfo *file)
{
int retval, mode, i;
dev = dev >> 4;
mode = file->mode & O_ACCMODE;
DEB (printk ("sequencer_open(dev=%d)\n", dev));
if (!sequencer_ok)
{
printk ("Soundcard: Sequencer not initialized\n");
return RET_ERROR (ENXIO);
}
if (dev) /* Patch manager device */
{
int err;
dev--;
if (pmgr_present[dev])
return RET_ERROR (EBUSY);
if ((err = pmgr_open (dev)) < 0)
return err; /* Failed */
pmgr_present[dev] = 1;
return err;
}
if (sequencer_busy)
{
printk ("Sequencer busy\n");
return RET_ERROR (EBUSY);
}
if (!(num_synths + num_midis))
return RET_ERROR (ENXIO);
synth_open_mask = 0;
if (mode == OPEN_WRITE || mode == OPEN_READWRITE)
for (i = 0; i < num_synths; i++) /* Open synth devices */
if (synth_devs[i]->open (i, mode) < 0)
printk ("Sequencer: Warning! Cannot open synth device #%d\n", i);
else
synth_open_mask |= (1 << i);
seq_time = GET_TIME ();
for (i = 0; i < num_midis; i++)
{
midi_opened[i] = 0;
midi_written[i] = 0;
}
if (mode == OPEN_READ || mode == OPEN_READWRITE)
{ /* Initialize midi input devices */
if (!num_midis)
{
printk ("Sequencer: No Midi devices. Input not possible\n");
return RET_ERROR (ENXIO);
}
for (i = 0; i < num_midis; i++)
{
if ((retval = midi_devs[i]->open (i, mode,
sequencer_midi_input, sequencer_midi_output)) >= 0)
midi_opened[i] = 1;
}
}
sequencer_busy = 1;
RESET_WAIT_QUEUE (seq_sleeper, seq_sleep_flag);
RESET_WAIT_QUEUE (midi_sleeper, midi_sleep_flag);
output_treshold = SEQ_MAX_QUEUE / 2;
for (i = 0; i < num_synths; i++)
if (pmgr_present[i])
pmgr_inform (i, PM_E_OPENED, 0, 0, 0, 0);
return 0;
}
void
seq_drain_midi_queues (void)
{
int i, n;
/*
* Give the Midi drivers time to drain their output queues
*/
n = 1;
while (!PROCESS_ABORTING (midi_sleeper, midi_sleep_flag) && n)
{
n = 0;
for (i = 0; i < num_midis; i++)
if (midi_opened[i] && midi_written[i])
if (midi_devs[i]->buffer_status != NULL)
if (midi_devs[i]->buffer_status (i))
n++;
/*
* Let's have a delay
*/
if (n)
{
DO_SLEEP (seq_sleeper, seq_sleep_flag, HZ / 10);
}
}
}
void
sequencer_release (int dev, struct fileinfo *file)
{
int i;
int mode = file->mode & O_ACCMODE;
dev = dev >> 4;
DEB (printk ("sequencer_release(dev=%d)\n", dev));
if (dev) /* Patch manager device */
{
dev--;
pmgr_release (dev);
pmgr_present[dev] = 0;
return;
}
/*
* Wait until the queue is empty
*/
while (!PROCESS_ABORTING (seq_sleeper, seq_sleep_flag) && qlen)
{
seq_sync ();
}
if (mode != OPEN_READ)
seq_drain_midi_queues (); /* Ensure the output queues are empty */
seq_reset ();
if (mode != OPEN_READ)
seq_drain_midi_queues (); /* Flush the all notes off messages */
for (i = 0; i < num_midis; i++)
if (midi_opened[i])
midi_devs[i]->close (i);
if (mode == OPEN_WRITE || mode == OPEN_READWRITE)
for (i = 0; i < num_synths; i++)
if (synth_open_mask & (1 << i)) /* Actually opened */
if (synth_devs[i])
synth_devs[i]->close (i);
for (i = 0; i < num_synths; i++)
if (pmgr_present[i])
pmgr_inform (i, PM_E_CLOSED, 0, 0, 0, 0);
sequencer_busy = 0;
}
static int
seq_sync (void)
{
if (qlen && !seq_playing && !PROCESS_ABORTING (seq_sleeper, seq_sleep_flag))
seq_startplay ();
if (qlen && !SOMEONE_WAITING (seq_sleeper, seq_sleep_flag)) /* Queue not empty */
{
DO_SLEEP (seq_sleeper, seq_sleep_flag, 0);
}
return qlen;
}
static void
midi_outc (int dev, unsigned char data)
{
/*
* NOTE! Calls sleep(). Don't call this from interrupt.
*/
int n;
/* This routine sends one byte to the Midi channel. */
/* If the output Fifo is full, it waits until there */
/* is space in the queue */
n = 300; /* Timeout in jiffies */
while (n && !midi_devs[dev]->putc (dev, data))
{
DO_SLEEP (seq_sleeper, seq_sleep_flag, 4);
n--;
}
}
static void
seq_reset (void)
{
/*
* NOTE! Calls sleep(). Don't call this from interrupt.
*/
int i, chn;
sound_stop_timer ();
qlen = qhead = qtail = 0;
iqlen = iqhead = iqtail = 0;
for (i = 0; i < num_synths; i++)
if (synth_open_mask & (1 << i))
if (synth_devs[i])
synth_devs[i]->reset (i);
for (i = 0; i < num_midis; i++)
if (midi_written[i]) /* Midi used. Some notes may still be playing */
{
for (chn = 0; chn < 16; chn++)
{
midi_outc (i,
(unsigned char)(0xb0 + (chn & 0xff))); /* Channel msg */
midi_outc (i, 0x7b);/* All notes off */
midi_outc (i, 0); /* Dummy parameter */
}
midi_devs[i]->close (i);
midi_written[i] = 0;
midi_opened[i] = 0;
}
seq_playing = 0;
if (SOMEONE_WAITING (seq_sleeper, seq_sleep_flag))
printk ("Sequencer Warning: Unexpected sleeping process\n");
}
int
sequencer_ioctl (int dev, struct fileinfo *file,
unsigned int cmd, unsigned int arg)
{
int midi_dev, orig_dev;
int mode = file->mode & O_ACCMODE;
orig_dev = dev = dev >> 4;
switch (cmd)
{
case SNDCTL_SEQ_SYNC:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
if (mode == OPEN_READ)
return 0;
while (qlen && !PROCESS_ABORTING (seq_sleeper, seq_sleep_flag))
seq_sync ();
return 0;
break;
case SNDCTL_SEQ_RESET:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
seq_reset ();
return 0;
break;
case SNDCTL_SEQ_TESTMIDI:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
midi_dev = IOCTL_IN (arg);
if (midi_dev >= num_midis)
return RET_ERROR (ENXIO);
if (!midi_opened[midi_dev])
{
int err, mode;
mode = file->mode & O_ACCMODE;
if ((err = midi_devs[midi_dev]->open (midi_dev, mode,
sequencer_midi_input,
sequencer_midi_output)) < 0)
return err;
}
midi_opened[midi_dev] = 1;
return 0;
break;
case SNDCTL_SEQ_GETINCOUNT:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
if (mode == OPEN_WRITE)
return 0;
return IOCTL_OUT (arg, iqlen);
break;
case SNDCTL_SEQ_GETOUTCOUNT:
if (mode == OPEN_READ)
return 0;
return IOCTL_OUT (arg, SEQ_MAX_QUEUE - qlen);
break;
case SNDCTL_SEQ_CTRLRATE:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
/* If *arg == 0, just return the current rate */
return IOCTL_OUT (arg, HZ);
break;
case SNDCTL_SEQ_RESETSAMPLES:
dev = IOCTL_IN (arg);
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)) && !orig_dev)
return RET_ERROR (EBUSY);
if (!orig_dev && pmgr_present[dev])
pmgr_inform (dev, PM_E_PATCH_RESET, 0, 0, 0, 0);
return synth_devs[dev]->ioctl (dev, cmd, arg);
break;
case SNDCTL_SEQ_NRSYNTHS:
return IOCTL_OUT (arg, num_synths);
break;
case SNDCTL_SEQ_NRMIDIS:
return IOCTL_OUT (arg, num_midis);
break;
case SNDCTL_SYNTH_MEMAVL:
{
int dev = IOCTL_IN (arg);
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)) && !orig_dev)
return RET_ERROR (EBUSY);
return IOCTL_OUT (arg, synth_devs[dev]->ioctl (dev, cmd, arg));
}
break;
case SNDCTL_FM_4OP_ENABLE:
{
int dev = IOCTL_IN (arg);
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)))
return RET_ERROR (ENXIO);
synth_devs[dev]->ioctl (dev, cmd, arg);
return 0;
}
break;
case SNDCTL_SYNTH_INFO:
{
struct synth_info inf;
int dev;
IOCTL_FROM_USER ((char *) &inf, (char *) arg, 0, sizeof (inf));
dev = inf.device;
if (dev < 0 || dev >= num_synths)
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << dev)) && !orig_dev)
return RET_ERROR (EBUSY);
return synth_devs[dev]->ioctl (dev, cmd, arg);
}
break;
case SNDCTL_MIDI_INFO:
{
struct midi_info inf;
int dev;
IOCTL_FROM_USER ((char *) &inf, (char *) arg, 0, sizeof (inf));
dev = inf.device;
if (dev < 0 || dev >= num_midis)
return RET_ERROR (ENXIO);
IOCTL_TO_USER ((char *) arg, 0, (char *) &(midi_devs[dev]->info), sizeof (inf));
return 0;
}
break;
case SNDCTL_PMGR_IFACE:
{
struct patmgr_info *inf;
int dev, err;
inf = (struct patmgr_info *) KERNEL_MALLOC (sizeof (*inf));
IOCTL_FROM_USER ((char *) inf, (char *) arg, 0, sizeof (*inf));
dev = inf->device;
if (dev < 0 || dev >= num_synths)
{
KERNEL_FREE (inf);
return RET_ERROR (ENXIO);
}
if (!synth_devs[dev]->pmgr_interface)
{
KERNEL_FREE (inf);
return RET_ERROR (ENXIO);
}
if ((err = synth_devs[dev]->pmgr_interface (dev, inf)) == -1)
{
KERNEL_FREE (inf);
return err;
}
IOCTL_TO_USER ((char *) arg, 0, (char *) inf, sizeof (*inf));
KERNEL_FREE (inf);
return 0;
}
break;
case SNDCTL_PMGR_ACCESS:
{
struct patmgr_info *inf;
int dev, err;
inf = (struct patmgr_info *) KERNEL_MALLOC (sizeof (*inf));
IOCTL_FROM_USER ((char *) inf, (char *) arg, 0, sizeof (*inf));
dev = inf->device;
if (dev < 0 || dev >= num_synths)
{
KERNEL_FREE (inf);
return RET_ERROR (ENXIO);
}
if (!pmgr_present[dev])
{
KERNEL_FREE (inf);
return RET_ERROR (ESRCH);
}
if ((err = pmgr_access (dev, inf)) < 0)
{
KERNEL_FREE (inf);
return err;
}
IOCTL_TO_USER ((char *) arg, 0, (char *) inf, sizeof (*inf));
KERNEL_FREE (inf);
return 0;
}
break;
case SNDCTL_SEQ_TRESHOLD:
{
int tmp = IOCTL_IN (arg);
if (dev) /* Patch manager */
return RET_ERROR (EIO);
if (tmp < 1)
tmp = 1;
if (tmp >= SEQ_MAX_QUEUE)
tmp = SEQ_MAX_QUEUE - 1;
output_treshold = tmp;
return 0;
}
break;
default:
if (dev) /* Patch manager */
return RET_ERROR (EIO);
if (mode == OPEN_READ)
return RET_ERROR (EIO);
if (!synth_devs[0])
return RET_ERROR (ENXIO);
if (!(synth_open_mask & (1 << 0)))
return RET_ERROR (ENXIO);
return synth_devs[0]->ioctl (0, cmd, arg);
break;
}
return RET_ERROR (EINVAL);
}
#ifdef ALLOW_SELECT
int
sequencer_select (int dev, struct fileinfo *file, int sel_type, select_table * wait)
{
dev = dev >> 4;
switch (sel_type)
{
case SEL_IN:
if (!iqlen)
{
select_wait (&midi_sleeper, wait);
return 0;
}
return 1;
break;
case SEL_OUT:
if (qlen >= SEQ_MAX_QUEUE)
{
select_wait (&seq_sleeper, wait);
return 0;
}
return 1;
break;