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alsa-seq-server.c
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/*-
* Copyright (c) 2019-2022 Hans Petter Selasky <hselasky@FreeBSD.org>
* All rights reserved.
*
* 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.
*/
/*
* Based on ALSA sequencer Client Manager
* Copyright (c) 1998-2001 by Frank van de Pol <fvdpol@coil.demon.nl>
* Jaroslav Kysela <perex@perex.cz>
* Takashi Iwai <tiwai@suse.de>
*/
/*
* Based on ALSA sequencer Ports
* Copyright (c) 1998 by Frank van de Pol <fvdpol@coil.demon.nl>
* Jaroslav Kysela <perex@perex.cz>
*/
#include "alsa-seq-server.h"
#include <cuse.h>
pthread_mutex_t ass_mtx;
static pthread_cond_t ass_cv;
static uid_t uid;
static gid_t gid;
static mode_t mode = 0666;
static const char *dname = "snd/seq";
static bool background;
static ass_client_head_t ass_client_head =
TAILQ_HEAD_INITIALIZER(ass_client_head);
static const uint8_t ass_cmd_to_len[16] = {
[0x0] = 0, /* reserved */
[0x1] = 0, /* reserved */
[0x2] = 2, /* bytes */
[0x3] = 3, /* bytes */
[0x4] = 3, /* bytes */
[0x5] = 1, /* bytes */
[0x6] = 2, /* bytes */
[0x7] = 3, /* bytes */
[0x8] = 3, /* bytes */
[0x9] = 3, /* bytes */
[0xA] = 3, /* bytes */
[0xB] = 3, /* bytes */
[0xC] = 2, /* bytes */
[0xD] = 2, /* bytes */
[0xE] = 3, /* bytes */
[0xF] = 1, /* bytes */
};
static void
ass_init(void)
{
pthread_condattr_t attr;
pthread_mutex_init(&ass_mtx, NULL);
pthread_condattr_init(&attr);
pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
pthread_cond_init(&ass_cv, &attr);
pthread_condattr_destroy(&attr);
}
static void
ass_lock(void)
{
pthread_mutex_lock(&ass_mtx);
}
static void
ass_unlock(void)
{
pthread_mutex_unlock(&ass_mtx);
}
static void
ass_wait(void)
{
pthread_cond_wait(&ass_cv, &ass_mtx);
}
static void
ass_wait_timeout(uint64_t nsec)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
ts.tv_nsec += nsec % 1000000000ULL;
ts.tv_sec += nsec / 1000000000ULL;
if (ts.tv_nsec >= 1000000000) {
ts.tv_nsec -= 1000000000;
ts.tv_sec += 1;
}
pthread_cond_timedwait(&ass_cv, &ass_mtx, &ts);
}
static void
ass_wakeup(void)
{
pthread_cond_broadcast(&ass_cv);
cuse_poll_wakeup();
}
static uid_t
ass_id(const char *name, const char *type)
{
uid_t val;
char *ep;
val = strtoul(name, &ep, 10);
if (*ep != '\0')
errx(EX_USAGE, "%s: illegal %s name", name, type);
return (val);
}
static void
ass_uid(const char *s)
{
struct passwd *pw;
uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : ass_id(s, "user");
}
static void
ass_gid(const char *s)
{
struct passwd *pw;
gid = ((pw = getpwnam(s)) != NULL) ? pw->pw_gid : ass_id(s, "group");
}
/*
* The following statemachine, that converts MIDI commands to
* USB MIDI packets, derives from Linux's usbmidi.c, which
* was written by "Clemens Ladisch":
*
* Returns:
* 0: No command
* Else: Command is complete
*/
static uint8_t
ass_midi_convert(struct ass_parse *parse, uint8_t cn, uint8_t b)
{
uint8_t p0 = (cn << 4);
if (b >= 0xf8) {
parse->temp_0[0] = p0 | 0x0f;
parse->temp_0[1] = b;
parse->temp_0[2] = 0;
parse->temp_0[3] = 0;
parse->temp_cmd = parse->temp_0;
return (1);
} else if (b >= 0xf0) {
switch (b) {
case 0xf0: /* system exclusive begin */
parse->temp_1[1] = b;
parse->state = ASS_ST_SYSEX_1;
break;
case 0xf1: /* MIDI time code */
case 0xf3: /* song select */
parse->temp_1[1] = b;
parse->state = ASS_ST_1PARAM;
break;
case 0xf2: /* song position pointer */
parse->temp_1[1] = b;
parse->state = ASS_ST_2PARAM_1;
break;
case 0xf4: /* unknown */
case 0xf5: /* unknown */
parse->state = ASS_ST_UNKNOWN;
break;
case 0xf6: /* tune request */
parse->temp_1[0] = p0 | 0x05;
parse->temp_1[1] = 0xf6;
parse->temp_1[2] = 0;
parse->temp_1[3] = 0;
parse->temp_cmd = parse->temp_1;
parse->state = ASS_ST_UNKNOWN;
return (1);
case 0xf7: /* system exclusive end */
switch (parse->state) {
case ASS_ST_SYSEX_0:
parse->temp_1[0] = p0 | 0x05;
parse->temp_1[1] = 0xf7;
parse->temp_1[2] = 0;
parse->temp_1[3] = 0;
parse->temp_cmd = parse->temp_1;
parse->state = ASS_ST_UNKNOWN;
return (2);
case ASS_ST_SYSEX_1:
parse->temp_1[0] = p0 | 0x06;
parse->temp_1[2] = 0xf7;
parse->temp_1[3] = 0;
parse->temp_cmd = parse->temp_1;
parse->state = ASS_ST_UNKNOWN;
return (2);
case ASS_ST_SYSEX_2:
parse->temp_1[0] = p0 | 0x07;
parse->temp_1[3] = 0xf7;
parse->temp_cmd = parse->temp_1;
parse->state = ASS_ST_UNKNOWN;
return (2);
}
parse->state = ASS_ST_UNKNOWN;
break;
}
} else if (b >= 0x80) {
parse->temp_1[1] = b;
if ((b >= 0xc0) && (b <= 0xdf)) {
parse->state = ASS_ST_1PARAM;
} else {
parse->state = ASS_ST_2PARAM_1;
}
} else { /* b < 0x80 */
switch (parse->state) {
case ASS_ST_1PARAM:
if (parse->temp_1[1] < 0xf0) {
p0 |= parse->temp_1[1] >> 4;
} else {
p0 |= 0x02;
parse->state = ASS_ST_UNKNOWN;
}
parse->temp_1[0] = p0;
parse->temp_1[2] = b;
parse->temp_1[3] = 0;
parse->temp_cmd = parse->temp_1;
return (1);
case ASS_ST_2PARAM_1:
parse->temp_1[2] = b;
parse->state = ASS_ST_2PARAM_2;
break;
case ASS_ST_2PARAM_2:
if (parse->temp_1[1] < 0xf0) {
p0 |= parse->temp_1[1] >> 4;
parse->state = ASS_ST_2PARAM_1;
} else {
p0 |= 0x03;
parse->state = ASS_ST_UNKNOWN;
}
parse->temp_1[0] = p0;
parse->temp_1[3] = b;
parse->temp_cmd = parse->temp_1;
return (1);
case ASS_ST_SYSEX_0:
parse->temp_1[1] = b;
parse->state = ASS_ST_SYSEX_1;
break;
case ASS_ST_SYSEX_1:
parse->temp_1[2] = b;
parse->state = ASS_ST_SYSEX_2;
break;
case ASS_ST_SYSEX_2:
parse->temp_1[0] = p0 | 0x04;
parse->temp_1[3] = b;
parse->temp_cmd = parse->temp_1;
parse->state = ASS_ST_SYSEX_0;
return (2);
default:
break;
}
}
return (0);
}
static bool
ass_fifo_empty(struct ass_fifo *fifo)
{
return (fifo->producer == fifo->consumer);
}
static unsigned
ass_fifo_size(struct ass_fifo *fifo)
{
return (fifo->producer - fifo->consumer);
}
static bool
ass_fifo_push(struct ass_fifo *fifo, struct snd_seq_event *event)
{
unsigned size = fifo->producer - fifo->consumer;
if (size >= ASS_FIFO_MAX)
return (false);
fifo->data[fifo->producer++ % ASS_FIFO_MAX] = *event;
ass_wakeup();
return (true);
}
static bool
ass_fifo_pull(struct ass_fifo *fifo, struct snd_seq_event *event)
{
unsigned size = fifo->producer - fifo->consumer;
if (size == 0)
return (false);
*event = fifo->data[fifo->consumer++ % ASS_FIFO_MAX];
return (true);
}
struct ass_client *
ass_client_by_number(int number)
{
struct ass_client *pass;
TAILQ_FOREACH(pass, &ass_client_head, entry) {
if (pass->number == number)
break;
}
return (pass);
}
static struct ass_port *
ass_port_by_number(struct ass_client *pass, int number)
{
struct ass_port *port;
TAILQ_FOREACH(port, &pass->head, entry) {
if (port->addr.port == number)
break;
}
return (port);
}
static struct ass_client *
ass_get_event_dest_client(struct ass_client *dest, struct snd_seq_event *event, int filter)
{
if (dest == NULL || dest->number != event->dest.client)
dest = ass_client_by_number(event->dest.client);
if (dest == NULL)
return (NULL);
if (!dest->accept_input)
return (NULL);
if ((dest->filter & SNDRV_SEQ_FILTER_USE_EVENT) &&
(dest->event_filter[event->type / 8] & (1 << (event->type % 8))) == 0)
return (NULL);
if (filter && !(dest->filter & filter))
return (NULL);
return (dest);
}
static bool
ass_send_synth_event(struct snd_seq_event *ev, int fd)
{
uint8_t buffer[3] = {};
int len;
switch (ev->type) {
case SNDRV_SEQ_EVENT_NOTEON:
buffer[0] |= 0x90;
break;
case SNDRV_SEQ_EVENT_NOTEOFF:
buffer[0] |= 0x80;
break;
case SNDRV_SEQ_EVENT_KEYPRESS:
buffer[0] |= 0xA0;
break;
case SNDRV_SEQ_EVENT_CONTROLLER:
buffer[0] |= 0xB0;
break;
case SNDRV_SEQ_EVENT_PGMCHANGE:
buffer[0] |= 0xC0;
break;
case SNDRV_SEQ_EVENT_CHANPRESS:
buffer[0] |= 0xD0;
break;
case SNDRV_SEQ_EVENT_PITCHBEND:
buffer[0] |= 0xE0;
break;
case SNDRV_SEQ_EVENT_SYSEX:
return (write(fd, &ev->data.ext.ptr, ev->data.ext.len) == ev->data.ext.len);
case SNDRV_SEQ_EVENT_QFRAME:
buffer[0] |= 0xF1;
break;
case SNDRV_SEQ_EVENT_SONGPOS:
buffer[0] |= 0xF2;
break;
case SNDRV_SEQ_EVENT_SONGSEL:
buffer[0] |= 0xF3;
break;
case SNDRV_SEQ_EVENT_TUNE_REQUEST:
buffer[0] |= 0xF6;
break;
case SNDRV_SEQ_EVENT_CLOCK:
buffer[0] |= 0xF8;
break;
case SNDRV_SEQ_EVENT_START:
buffer[0] |= 0xFA;
break;
case SNDRV_SEQ_EVENT_CONTINUE:
buffer[0] |= 0xFB;
break;
case SNDRV_SEQ_EVENT_STOP:
buffer[0] |= 0xFC;
break;
case SNDRV_SEQ_EVENT_SENSING:
buffer[0] |= 0xFE;
break;
case SNDRV_SEQ_EVENT_RESET:
buffer[0] |= 0xFF;
break;
default:
return (true);
}
switch (ev->type) {
case SNDRV_SEQ_EVENT_NOTEON:
case SNDRV_SEQ_EVENT_NOTEOFF:
case SNDRV_SEQ_EVENT_KEYPRESS:
buffer[0] |= ev->data.note.channel & 0xF;
buffer[1] |= ev->data.note.note & 0x7F;
buffer[2] |= ev->data.note.velocity & 0x7F;
len = 3;
break;
case SNDRV_SEQ_EVENT_CHANPRESS:
case SNDRV_SEQ_EVENT_PGMCHANGE:
buffer[0] |= ev->data.control.channel & 0xF;
buffer[1] |= ev->data.control.value & 0x7F;
len = 2;
break;
case SNDRV_SEQ_EVENT_CONTROLLER:
buffer[0] |= ev->data.control.channel & 0xF;
buffer[1] |= ev->data.control.param & 0x7F;
buffer[2] |= ev->data.control.value & 0x7F;
len = 3;
break;
case SNDRV_SEQ_EVENT_PITCHBEND:
buffer[0] |= ev->data.control.channel & 0xF;
buffer[1] |= (ev->data.control.value + 8192) & 0x7F;
buffer[2] |= ((ev->data.control.value + 8192) >> 7) & 0x7F;
len = 3;
break;
case SNDRV_SEQ_EVENT_QFRAME:
case SNDRV_SEQ_EVENT_SONGSEL:
buffer[1] |= ev->data.control.value & 0x7F;
len = 2;
break;
case SNDRV_SEQ_EVENT_SONGPOS:
buffer[1] |= (ev->data.control.value & 0x7F);
buffer[2] |= ((ev->data.control.value >> 7) & 0x7F);
len = 3;
break;
default:
len = 1;
break;
}
return (write(fd, buffer, len) == len);
}
static bool
ass_receive_synth_event(struct snd_seq_event *ev,
struct ass_parse *parse, int fd)
{
uint8_t buffer[1];
while (read(fd, buffer, sizeof(buffer)) == 1) {
switch (ass_midi_convert(parse, 0, buffer[0])) {
case 0:
continue;
case 1:
break;
default:
memset(ev, 0, sizeof(*ev));
ev->type = SNDRV_SEQ_EVENT_SYSEX;
ev->flags = SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
ev->data.ext.len = ass_cmd_to_len[parse->temp_cmd[0] & 0xF];
/* internal hack */
memcpy(&ev->data.ext.ptr, parse->temp_cmd + 1, ev->data.ext.len);
return (true);
}
memset(ev, 0, sizeof(*ev));
switch ((parse->temp_cmd[1] & 0xF0) >> 4) {
case 0x9:
ev->type = SNDRV_SEQ_EVENT_NOTEON;
break;
case 0x8:
ev->type = SNDRV_SEQ_EVENT_NOTEOFF;
break;
case 0xA:
ev->type = SNDRV_SEQ_EVENT_KEYPRESS;
break;
case 0xB:
ev->type = SNDRV_SEQ_EVENT_CONTROLLER;
break;
case 0xC:
ev->type = SNDRV_SEQ_EVENT_PGMCHANGE;
break;
case 0xD:
ev->type = SNDRV_SEQ_EVENT_CHANPRESS;
break;
case 0xE:
ev->type = SNDRV_SEQ_EVENT_PITCHBEND;
break;
case 0xF:
switch (parse->temp_cmd[1] & 0x0F) {
case 0x1:
ev->type = SNDRV_SEQ_EVENT_QFRAME;
break;
case 0x2:
ev->type = SNDRV_SEQ_EVENT_SONGPOS;
break;
case 0x3:
ev->type = SNDRV_SEQ_EVENT_SONGSEL;
break;
case 0x6:
ev->type = SNDRV_SEQ_EVENT_TUNE_REQUEST;
break;
case 0x8:
ev->type = SNDRV_SEQ_EVENT_CLOCK;
break;
case 0xA:
ev->type = SNDRV_SEQ_EVENT_START;
break;
case 0xB:
ev->type = SNDRV_SEQ_EVENT_CONTINUE;
break;
case 0xC:
ev->type = SNDRV_SEQ_EVENT_STOP;
break;
case 0xE:
ev->type = SNDRV_SEQ_EVENT_SENSING;
break;
case 0xF:
ev->type = SNDRV_SEQ_EVENT_RESET;
break;
default:
continue;
}
break;
default:
continue;
}
switch (ev->type) {
case SNDRV_SEQ_EVENT_NOTEON:
case SNDRV_SEQ_EVENT_NOTEOFF:
case SNDRV_SEQ_EVENT_KEYPRESS:
ev->data.note.channel = parse->temp_cmd[1] & 0xF;
ev->data.note.note = parse->temp_cmd[2] & 0x7F;
ev->data.note.velocity = parse->temp_cmd[3] & 0x7F;
break;
case SNDRV_SEQ_EVENT_PGMCHANGE:
case SNDRV_SEQ_EVENT_CHANPRESS:
ev->data.control.channel = parse->temp_cmd[1] & 0xF;
ev->data.control.value = parse->temp_cmd[2] & 0x7F;
break;
case SNDRV_SEQ_EVENT_CONTROLLER:
ev->data.control.channel = parse->temp_cmd[1] & 0xF;
ev->data.control.param = parse->temp_cmd[2] & 0x7F;
ev->data.control.value = parse->temp_cmd[3] & 0x7F;
break;
case SNDRV_SEQ_EVENT_PITCHBEND:
ev->data.control.channel = parse->temp_cmd[1] & 0xF;
ev->data.control.value =
(parse->temp_cmd[2] & 0x7F) |
((parse->temp_cmd[3] & 0x7F) << 7);
ev->data.control.value -= 8192;
break;
case SNDRV_SEQ_EVENT_QFRAME:
case SNDRV_SEQ_EVENT_SONGSEL:
ev->data.control.value = parse->temp_cmd[1] & 0x7F;
break;
case SNDRV_SEQ_EVENT_SONGPOS:
ev->data.control.value = (parse->temp_cmd[1] & 0x7F) |
((parse->temp_cmd[2] & 0x7F) << 7);
break;
default:
break;
}
return (true);
}
return (false);
}
static int
ass_check_port_perm(struct ass_port *port, unsigned int flags)
{
if ((port->capability & flags) != flags)
return (0);
return (flags);
}
static void
ass_deliver_single_event(struct ass_client *client,
struct snd_seq_event *event, int filter,
struct ass_subscribers *subs)
{
struct ass_client *dest;
struct ass_port *dest_port;
dest = ass_get_event_dest_client(client, event, filter);
if (dest == NULL)
return;
dest_port = ass_port_by_number(dest, event->dest.port);
if (dest_port == NULL)
return;
if (!ass_check_port_perm(dest_port, SNDRV_SEQ_PORT_CAP_WRITE))
return;
/* check if destination port requests a timestamp */
if (dest_port->timestamping == 0 ||
ass_queue_update_timestamp(dest_port->time_queue, dest_port->time_real, event) == false) {
/* check if subscription requests a timestamp */
if (subs == NULL ||
(subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIMESTAMP) == 0 ||
ass_queue_update_timestamp(subs->info.queue,
(subs->info.flags & SNDRV_SEQ_PORT_SUBS_TIME_REAL) != 0, event) == false) {
/* don't timestamp */
}
}
switch (dest->type) {
case USER_CLIENT:
if (!ass_fifo_push(&dest->rx_fifo, event))
client->event_lost++;
break;
case KERNEL_CLIENT:
if (dest->tx_fd > -1 &&
!ass_send_synth_event(event, dest->tx_fd))
client->event_lost++;
break;
default:
break;
}
}
void
ass_deliver_to_subscribers(struct ass_client *client,
struct snd_seq_event *event)
{
struct ass_subscribers *subs;
struct ass_port *src_port;
ass_queue_filter_events(event);
src_port = ass_port_by_number(client, event->source.port);
if (src_port == NULL)
return;
switch (event->type) {
case SNDRV_SEQ_EVENT_ECHO:
/* handle echo requests here */
event->dest = event->source;
if (ass_check_port_perm(src_port, SNDRV_SEQ_PORT_CAP_WRITE) &&
ass_fifo_push(&client->rx_fifo, event) == false)
client->event_lost++;
break;
default:
TAILQ_FOREACH(subs, &src_port->c_src.head, src_entry) {
if (subs->ref_count != 2)
continue;
event->dest = subs->info.dest;
ass_deliver_single_event(client, event, 0, subs);
}
break;
}
}
static int
ass_read(struct cuse_dev *pdev, int fflags, void *peer_ptr, int len)
{
struct ass_client *pass;
struct snd_seq_event temp[2];
int error;
int retval;
pass = cuse_dev_get_per_file_handle(pdev);
if (pass == NULL)
return (CUSE_ERR_INVALID);
ass_lock();
if (pass->rx_busy) {
ass_unlock();
return (CUSE_ERR_BUSY);
}
retval = 0;
while (len >= (int)sizeof(temp)) {
int delta;
if (ass_fifo_pull(&pass->rx_fifo, &temp[0]) == false) {
/* out of data */
if (fflags & CUSE_FFLAG_NONBLOCK) {
if (retval == 0)
retval = CUSE_ERR_WOULDBLOCK;
break;
}
/* check if we got some data */
if (retval != 0)
break;
pass->rx_busy = 1;
ass_wait_timeout(1000000000ULL);
pass->rx_busy = 0;
if (cuse_got_peer_signal() == 0) {
retval = CUSE_ERR_SIGNAL;
break;
}
continue;
}
if ((temp[0].flags & SNDRV_SEQ_EVENT_LENGTH_MASK) == SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
/* copy data in-place */
memcpy(&temp[1], &temp[0].data.ext.ptr, sizeof(temp[0].data.ext.ptr));
temp[0].data.ext.ptr = NULL;
delta = sizeof(temp);
} else {
delta = sizeof(temp[0]);
}
pass->rx_busy = 1;
ass_unlock();
error = cuse_copy_out(&temp[0], peer_ptr, delta);
ass_lock();
pass->rx_busy = 0;
if (error != 0) {
retval = error;
break;
}
peer_ptr = (uint8_t *)peer_ptr + delta;
retval += delta;
len -= delta;
}
ass_unlock();
return (retval);
}
static int
ass_write(struct cuse_dev *pdev, int fflags, const void *peer_ptr, int len)
{
struct ass_client *pass;
struct snd_seq_event temp;
uint8_t var_data[ASS_FIFO_MAX * sizeof(void *)];
int error;
int retval;
pass = cuse_dev_get_per_file_handle(pdev);
if (pass == NULL)
return (CUSE_ERR_INVALID);
retval = 0;
ass_lock();
if (pass->tx_busy) {
ass_unlock();
return (CUSE_ERR_BUSY);
}
while (len >= (int)sizeof(temp)) {
int delta;
pass->tx_busy = 1;
ass_unlock();
error = cuse_copy_in(peer_ptr, &temp, sizeof(temp));
ass_lock();
pass->tx_busy = 0;
if (error != 0) {
retval = error;
break;
}
temp.source.client = pass->number;
if ((temp.flags & SNDRV_SEQ_EVENT_LENGTH_MASK) ==
SNDRV_SEQ_EVENT_LENGTH_VARIABLE) {
temp.data.ext.len &= ~0xc0000000U;
delta = temp.data.ext.len + sizeof(temp);
if (delta < (int)sizeof(temp) ||
delta > len ||
delta > (int)(sizeof(temp) + sizeof(var_data))) {
retval = CUSE_ERR_INVALID;
break;
}
if (temp.type == SNDRV_SEQ_EVENT_SYSEX) {
int off;
pass->tx_busy = 1;
ass_unlock();
error = cuse_copy_in((const uint8_t *)peer_ptr +
sizeof(temp), var_data, delta - sizeof(temp));
ass_lock();
pass->tx_busy = 0;
if (error != 0) {
retval = error;
break;
}
/* split up and deliver the event(s) */
for (off = 0; off < (int)(delta - sizeof(temp)); off += sizeof(temp.data.ext.ptr)) {
int x = delta - sizeof(temp) - off;
if (x > (int)sizeof(temp.data.ext.ptr))
x = sizeof(temp.data.ext.ptr);
temp.data.ext.len = x;
memcpy(&temp.data.ext.ptr, var_data + off, x);
if (temp.queue != SNDRV_SEQ_QUEUE_DIRECT) {
while (pass->output_used == ASS_FIFO_MAX) {
if (fflags & CUSE_FFLAG_NONBLOCK) {
if (retval == 0)
retval = CUSE_ERR_WOULDBLOCK;
goto done;
}
if (cuse_got_peer_signal() == 0) {
if (retval == 0)
retval = CUSE_ERR_SIGNAL;
goto done;
}
pass->tx_busy = 1;
ass_unlock();
usleep(10000); /* wait 10ms */
ass_lock();
pass->tx_busy = 0;
}
ass_queue_deliver_to_subscribers(pass, &temp);
} else {
ass_deliver_to_subscribers(pass, &temp);
}
}
}
} else {
delta = sizeof(temp);
/* check if event should be delivered */
if (temp.type != SNDRV_SEQ_EVENT_NONE &&
temp.type != SNDRV_SEQ_EVENT_SYSEX &&
temp.type != SNDRV_SEQ_EVENT_BOUNCE) {
/* Handle special case, note on with zero velocity. */
if (temp.type == SNDRV_SEQ_EVENT_NOTEON &&
temp.data.note.velocity == 0)
temp.type = SNDRV_SEQ_EVENT_NOTEOFF;
if (temp.queue != SNDRV_SEQ_QUEUE_DIRECT) {
while (pass->output_used == ASS_FIFO_MAX) {
if (fflags & CUSE_FFLAG_NONBLOCK) {
if (retval == 0)
retval = CUSE_ERR_WOULDBLOCK;
goto done;
}
if (cuse_got_peer_signal() == 0) {
if (retval == 0)
retval = CUSE_ERR_SIGNAL;
goto done;
}
pass->tx_busy = 1;
ass_unlock();
usleep(10000); /* wait 10ms */
ass_lock();
pass->tx_busy = 0;
}
ass_queue_deliver_to_subscribers(pass, &temp);
} else {
ass_deliver_to_subscribers(pass, &temp);
}
}
}
peer_ptr = (const uint8_t *)peer_ptr + delta;
retval += delta;
len -= delta;
}
done:
ass_unlock();
return (retval);
}
static void
ass_broadcast_port_event(int evtype, int client, int port)
{
struct ass_client *pass;
struct snd_seq_event event;
memset(&event, 0, sizeof(event));
event.type = evtype;
event.flags = SNDRV_SEQ_EVENT_LENGTH_FIXED;
event.source.client = SNDRV_SEQ_CLIENT_SYSTEM;
event.source.port = SNDRV_SEQ_PORT_SYSTEM_ANNOUNCE;
event.data.addr.client = client;
event.data.addr.port = port;
event.queue = SNDRV_SEQ_QUEUE_DIRECT;
TAILQ_FOREACH(pass, &ass_client_head, entry) {
if (pass->type != USER_CLIENT)
continue;
event.dest.client = pass->number;
ass_deliver_single_event(pass, &event, 0, NULL);
}
}
static struct ass_port *
ass_create_port(struct ass_client *pass, int addr)
{
struct ass_port *port;
struct ass_port *pother;
bool loop;
if (pass->num_ports >= ASS_MAX_PORTS ||
addr >= ASS_MAX_PORTS)
return (NULL);
port = malloc(sizeof(*port));
if (port == NULL)
return (NULL);
memset(port, 0, sizeof(*port));
port->addr.client = pass->number;
if (addr < 0) {
do {
loop = false;
TAILQ_FOREACH(pother, &pass->head, entry) {
if (pother->addr.port == port->addr.port) {
port->addr.port++;
loop = true;
}
}
} while (loop);
} else {
if (ass_port_by_number(pass, addr) != NULL) {
free(port);
return (NULL);
}
port->addr.port = addr;
}
TAILQ_INIT(&port->c_dst.head);
TAILQ_INIT(&port->c_src.head);
pass->num_ports++;
snprintf(port->name, sizeof(port->name), "port-%d", port->addr.port);
TAILQ_INSERT_TAIL(&pass->head, port, entry);
return (port);
}
static int
ass_set_port_info(struct ass_port *port, struct snd_seq_port_info *info)
{
if (info->name[0])
strlcpy(port->name, info->name, sizeof(port->name));
port->capability = info->capability;
port->type = info->type;
port->midi_channels = info->midi_channels;
port->midi_voices = info->midi_voices;
port->synth_voices = info->synth_voices;
port->timestamping = (info->flags & SNDRV_SEQ_PORT_FLG_TIMESTAMP) ? 1 : 0;
port->time_real = (info->flags & SNDRV_SEQ_PORT_FLG_TIME_REAL) ? 1 : 0;
port->time_queue = info->time_queue;
return (0);
}
static int
ass_get_port_info(struct ass_port *port, struct snd_seq_port_info *info)
{
strlcpy(info->name, port->name, sizeof(info->name));
info->capability = port->capability;
info->type = port->type;
info->midi_channels = port->midi_channels;
info->midi_voices = port->midi_voices;
info->synth_voices = port->synth_voices;
info->read_use = port->c_src.count;
info->write_use = port->c_dst.count;
info->flags = 0;
if (port->timestamping) {
info->flags |= SNDRV_SEQ_PORT_FLG_TIMESTAMP;
if (port->time_real)
info->flags |= SNDRV_SEQ_PORT_FLG_TIME_REAL;
info->time_queue = port->time_queue;
}
return (0);
}