int main(int argc, char **argv)
{
int hwdep_fd;
snd_ctl_t *ctl;
(void) argc;
(void) argv;
// Setup the signal handler
struct sigaction sa = { 0 };
sa.sa_handler = &handle_signal;
// Handle standard signals to quit properly
sigemptyset(&sa.sa_mask);
sigaction(SIGINT, &sa, NULL);
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGTERM, &sa, NULL);
// Open control and hwdep devices
if (open_hwdep(Y50_HWDEP_DEVICE, &hwdep_fd) != 0
|| open_ctl(Y50_CTL_NAME, &ctl) != 0) {
return 1;
}
// Initialize subwoofer
lfe_initialize(hwdep_fd);
// Set initial values
set_headphones_plugged(&headphones_plugged);
set_lfe_volume(hwdep_fd, headphones_plugged ? 0 : get_master_volume());
// Poll events
while (!doneflag) {
struct pollfd fds;
snd_ctl_poll_descriptors(ctl, &fds, 1);
if (poll(&fds, 1, -1) <= 0) {
if (errno == EINTR) {
continue;
} else {
perror("poll");
break;
}
}
unsigned short revents;
snd_ctl_poll_descriptors_revents(ctl, &fds, 1, &revents);
if (revents & POLLIN) {
handle_event(hwdep_fd, ctl);
}
}
// Close resources
close(hwdep_fd);
snd_ctl_close(ctl);
return EXIT_SUCCESS;
}
static int check_event(struct elem_set_trial *trial, unsigned int mask,
unsigned int expected_count)
{
struct pollfd pfds;
int count;
unsigned short revents;
snd_ctl_event_t *event;
int err;
snd_ctl_event_alloca(&event);
if (snd_ctl_poll_descriptors_count(trial->handle) != 1)
return -ENXIO;
if (snd_ctl_poll_descriptors(trial->handle, &pfds, 1) != 1)
return -ENXIO;
while (expected_count > 0) {
count = poll(&pfds, 1, 1000);
if (count < 0)
return errno;
/* Some events are already supplied. */
if (count == 0)
return -ETIMEDOUT;
err = snd_ctl_poll_descriptors_revents(trial->handle, &pfds,
count, &revents);
if (err < 0)
return err;
if (revents & POLLERR)
return -EIO;
if (!(revents & POLLIN))
continue;
err = snd_ctl_read(trial->handle, event);
if (err < 0)
return err;
if (snd_ctl_event_get_type(event) != SND_CTL_EVENT_ELEM)
continue;
/*
* I expect each event is generated separately to the same
* element.
*/
if (!(snd_ctl_event_elem_get_mask(event) & mask))
continue;
--expected_count;
}
if (expected_count != 0)
return -EIO;
return 0;
}
/**
* \brief get returned events from poll descriptors
* \param hctl HCTL handle
* \param pfds array of poll descriptors
* \param nfds count of poll descriptors
* \param revents returned events
* \return zero if success, otherwise a negative error code
*/
int snd_hctl_poll_descriptors_revents(snd_hctl_t *hctl, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
{
assert(hctl);
return snd_ctl_poll_descriptors_revents(hctl->ctl, pfds, nfds, revents);
}
