Exemplos de snd_mixer_poll_descriptors_revents em C++ (Cpp)

Exemplo n.º 1

static void
task_monitor_alsa (gpointer data)
{
  struct pollfd *pfds;
  unsigned int nfds, rnfds;
  unsigned short revents;
  GstAlsaMixer *mixer = (GstAlsaMixer *) data;

  g_static_rec_mutex_lock (mixer->rec_mutex);

  nfds = snd_mixer_poll_descriptors_count (mixer->handle);
  if (nfds <= 0) {
    GST_ERROR ("snd_mixer_poll_descriptors_count <= 0: %d", nfds);
    /* FIXME: sleep ? stop monitoring ? */
    return;
  }

  pfds = g_newa (struct pollfd, nfds + 1);
  rnfds = snd_mixer_poll_descriptors (mixer->handle, pfds, nfds);
  g_assert (rnfds <= nfds);

  pfds[rnfds].fd = mixer->pfd[0];
  pfds[rnfds].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
  pfds[rnfds].revents = 0;

  g_static_rec_mutex_unlock (mixer->rec_mutex);

  GST_LOG ("task loop");
  poll (pfds, rnfds + 1, -1);

  g_static_rec_mutex_lock (mixer->rec_mutex);

  snd_mixer_poll_descriptors_revents (mixer->handle, pfds, nfds, &revents);
  if (revents & POLLIN || revents & POLLPRI) {
    GST_DEBUG ("Handling events");
    snd_mixer_handle_events (mixer->handle);
  }

  g_static_rec_mutex_unlock (mixer->rec_mutex);
}

Exemplo n.º 2

Arquivo: gstalsamixer.c Projeto: genesi/gst-base-plugins

static void
task_monitor_alsa (gpointer data)
{
  struct pollfd *pfds;
  unsigned int nfds, rnfds;
  unsigned short revents;
  GstAlsaMixer *mixer = (GstAlsaMixer *) data;
  gint ret;

  g_static_rec_mutex_lock (mixer->rec_mutex);

  nfds = snd_mixer_poll_descriptors_count (mixer->handle);
  if (nfds <= 0) {
    GST_ERROR ("snd_mixer_poll_descriptors_count <= 0: %d", nfds);
    /* FIXME: sleep ? stop monitoring ? */
    g_static_rec_mutex_unlock (mixer->rec_mutex);
    return;
  }

  pfds = g_newa (struct pollfd, nfds + 1);
  rnfds = snd_mixer_poll_descriptors (mixer->handle, pfds, nfds);
  g_assert (rnfds <= nfds);

  if (rnfds < 0) {
    GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), ("alsa error: %s",
            snd_strerror (rnfds)));
    gst_task_pause (mixer->task);
    g_static_rec_mutex_unlock (mixer->rec_mutex);
    return;
  }

  pfds[rnfds].fd = mixer->pfd[0];
  pfds[rnfds].events = POLLIN | POLLPRI | POLLHUP | POLLERR;
  pfds[rnfds].revents = 0;

  g_static_rec_mutex_unlock (mixer->rec_mutex);

  GST_LOG ("task loop");
  ret = poll (pfds, rnfds + 1, -1);

  if (ret < 0) {
    GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), GST_ERROR_SYSTEM);
    gst_task_pause (mixer->task);
    return;
  }

  g_static_rec_mutex_lock (mixer->rec_mutex);

  ret =
      snd_mixer_poll_descriptors_revents (mixer->handle, pfds, nfds, &revents);
  if (ret < 0) {
    GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), ("alsa error: %s",
            snd_strerror (ret)));
    gst_task_pause (mixer->task);
  } else if (revents & (POLLIN | POLLPRI)) {
    GST_DEBUG ("Handling events");
    snd_mixer_handle_events (mixer->handle);
  } else if (revents & (POLLERR | POLLNVAL | POLLHUP)) {
    GST_ELEMENT_ERROR (mixer, RESOURCE, READ, (NULL), (NULL));
    gst_task_pause (mixer->task);
  }

  g_static_rec_mutex_unlock (mixer->rec_mutex);
}