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rig.c
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rig.c
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/*
* Copyright (C) 2010 Mark Hills <[email protected]>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2, as published by the Free Software Foundation.
*
* 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 version 2 for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
*/
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/poll.h>
#include "device.h"
#include "player.h"
#include "rig.h"
#include "track.h"
#define REALTIME_PRIORITY 80
int rig_init(struct rig_t *rig)
{
int n;
for (n = 0; n < MAX_DEVICES; n++)
rig->device[n] = NULL;
for (n = 0; n < MAX_TRACKS; n++)
rig->track[n] = NULL;
for (n = 0; n < MAX_PLAYERS; n++)
rig->player[n] = NULL;
for (n = 0; n < MAX_TIMECODERS; n++)
rig->timecoder[n] = NULL;
return 0;
}
int rig_service(struct rig_t *rig)
{
int r, n;
char buf;
struct pollfd pt[MAX_TRACKS], *pe;
while (!rig->finished) {
pe = pt;
/* ppoll() is not widely available, so use a pipe between this
* thread and the outside. A single byte wakes up poll() to
* inform us that new file descriptors need to be polled */
pe->fd = rig->event[0];
pe->revents = 0;
pe->events = POLLIN | POLLHUP | POLLERR;
pe++;
/* Fetch file descriptors to monitor from each track */
for (n = 0; n < MAX_TRACKS; n++) {
if (rig->track[n])
pe += track_pollfd(rig->track[n], pe);
}
r = poll(pt, pe - pt, -1);
if (r == -1 && errno != EINTR) {
perror("poll");
return -1;
}
/* If we were awakened, take the top byte off the event pipe */
if (pt[0].revents) {
if (read(rig->event[0], &buf, 1) == -1) {
perror("read");
return -1;
}
}
/* Do any reading and writing on all tracks */
for (n = 0; n < MAX_TRACKS; n++) {
if (rig->track[n])
track_handle(rig->track[n]);
}
}
return 0;
}
int rig_realtime(struct rig_t *rig)
{
int r, n, max_pri;
struct sched_param sp;
/* Setup the POSIX scheduler */
fprintf(stderr, "Setting scheduler priority...\n");
if (sched_getparam(0, &sp)) {
perror("sched_getparam");
return -1;
}
max_pri = sched_get_priority_max(SCHED_FIFO);
sp.sched_priority = REALTIME_PRIORITY;
if (sp.sched_priority > max_pri) {
fprintf(stderr, "Invalid scheduling priority (maximum %d).\n",
max_pri);
return -1;
}
if (sched_setscheduler(0, SCHED_FIFO, &sp)) {
perror("sched_setscheduler");
fprintf(stderr, "Failed to set scheduler. Run as root otherwise you "
"may get wow and skips!\n");
}
while (!rig->finished) {
r = poll(rig->pt, rig->npt, -1);
if (r == -1 && errno != EINTR) {
perror("poll");
return -1;
}
for (n = 0; n < MAX_DEVICES; n++) {
if (rig->device[n])
device_handle(rig->device[n]);
}
}
return 0;
}
void* service(void *p)
{
rig_service(p);
return p;
}
void* realtime(void *p)
{
rig_realtime(p);
return p;
}
int rig_start(struct rig_t *rig)
{
int r, n;
struct pollfd *pe, *pm;
struct device_t *dv;
rig->finished = 0;
/* Register ourselves with the tracks we are looking after */
for (n = 0; n < MAX_TRACKS; n++) {
if (rig->track[n])
rig->track[n]->rig = rig;
}
/* Create a pipe which will be used to wake the service thread */
if (pipe(rig->event) == -1) {
perror("pipe");
return -1;
}
if (pthread_create(&rig->pt_service, NULL, service, (void*)rig)) {
perror("pthread_create");
return -1;
}
/* The requested poll events never change, so populate the poll
* entry table before entering the realtime thread */
pe = rig->pt;
pm = rig->pt + MAX_DEVICE_POLLFDS;
for (n = 0; n < MAX_DEVICES; n++) {
dv = rig->device[n];
if (!dv)
continue;
r = device_pollfds(dv, pe, pm - pe);
if (r == -1) {
fprintf(stderr, "Device failed to return file descriptors.\n");
return -1;
}
pe += r;
/* Start the audio rolling on the device */
if (device_start(dv) == -1)
return -1;
}
rig->npt = pe - rig->pt;
/* If there are any devices which returned file descriptors for
* poll() then launch the realtime thread to handle them */
if (rig->npt > 0) {
fprintf(stderr, "Launching realtime thread to handle devices...\n");
if (pthread_create(&rig->pt_realtime, NULL, realtime, (void*)rig)) {
perror("pthread_create");
return -1;
}
}
return 0;
}
/* Wake up the rig when a track controlled by it has changed */
int rig_awaken(struct rig_t *rig)
{
/* Send a single byte down the event pipe to a waiting poll() */
if (write(rig->event[1], "\0", 1) == -1) {
perror("write");
return -1;
}
return 0;
}
int rig_stop(struct rig_t *rig)
{
int n;
rig->finished = 1;
if (rig->npt > 0) {
if (pthread_join(rig->pt_realtime, NULL) != 0) {
perror("pthread_join");
return -1;
}
}
/* Stop audio rolling on devices */
for (n = 0; n < MAX_DEVICES; n++) {
if (rig->device[n])
device_stop(rig->device[n]);
}
rig_awaken(rig);
if (pthread_join(rig->pt_service, NULL) != 0) {
perror("pthread_join");
return -1;
}
return 0;
}