static GstStateChangeReturn
gst_decklink_video_sink_change_state (GstElement * element,
    GstStateChange transition)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);
  GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      g_mutex_lock (&self->output->lock);
      self->output->clock_start_time = GST_CLOCK_TIME_NONE;
      self->output->clock_epoch += self->output->clock_last_time;
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
      gst_element_post_message (element,
          gst_message_new_clock_provide (GST_OBJECT_CAST (element),
              self->output->clock, TRUE));
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
      GstClock *clock, *audio_clock;

      clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
      if (clock) {
        audio_clock = gst_decklink_output_get_audio_clock (self->output);
        if (clock && clock != self->output->clock && clock != audio_clock) {
          gst_clock_set_master (self->output->clock, clock);
        }
        gst_object_unref (clock);
        if (audio_clock)
          gst_object_unref (audio_clock);
      } else {
        GST_ELEMENT_ERROR (self, STREAM, FAILED,
            (NULL), ("Need a clock to go to PLAYING"));
        ret = GST_STATE_CHANGE_FAILURE;
      }

      break;
    }
    default:
      break;
  }

  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;
  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_element_post_message (element,
          gst_message_new_clock_lost (GST_OBJECT_CAST (element),
              self->output->clock));
      gst_clock_set_master (self->output->clock, NULL);
      // Reset calibration to make the clock reusable next time we use it
      gst_clock_set_calibration (self->output->clock, 0, 0, 1, 1);
      g_mutex_lock (&self->output->lock);
      self->output->clock_start_time = GST_CLOCK_TIME_NONE;
      self->output->clock_epoch += self->output->clock_last_time;
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
      gst_decklink_video_sink_stop (self);
      break;
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:{
      if (gst_decklink_video_sink_stop_scheduled_playback (self) ==
          GST_STATE_CHANGE_FAILURE)
        ret = GST_STATE_CHANGE_FAILURE;
      break;
    }
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
      g_mutex_lock (&self->output->lock);
      if (self->output->start_scheduled_playback)
        self->output->start_scheduled_playback (self->output->videosink);
      g_mutex_unlock (&self->output->lock);
      break;
    }
    default:
      break;
  }

  return ret;
}
Example #2
0
static GstStateChangeReturn
gst_decklink_video_sink_change_state (GstElement * element,
    GstStateChange transition)
{
  GstDecklinkVideoSink *self = GST_DECKLINK_VIDEO_SINK_CAST (element);
  GstStateChangeReturn ret;

  switch (transition) {
    case GST_STATE_CHANGE_READY_TO_PAUSED:
      g_mutex_lock (&self->output->lock);
      self->output->clock_start_time = GST_CLOCK_TIME_NONE;
      self->output->clock_epoch += self->output->clock_last_time;
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
      gst_element_post_message (element,
          gst_message_new_clock_provide (GST_OBJECT_CAST (element),
              self->output->clock, TRUE));
      break;
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
      GstClock *clock, *audio_clock;

      clock = gst_element_get_clock (GST_ELEMENT_CAST (self));
      audio_clock = gst_decklink_output_get_audio_clock (self->output);
      if (clock && clock != self->output->clock && clock != audio_clock) {
        gst_clock_set_master (self->output->clock, clock);
      }
      if (clock)
        gst_object_unref (clock);
      if (audio_clock)
        gst_object_unref (audio_clock);

      break;
    }
    default:
      break;
  }

  ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
  if (ret == GST_STATE_CHANGE_FAILURE)
    return ret;

  switch (transition) {
    case GST_STATE_CHANGE_PAUSED_TO_READY:
      gst_element_post_message (element,
          gst_message_new_clock_lost (GST_OBJECT_CAST (element),
              self->output->clock));
      gst_clock_set_master (self->output->clock, NULL);
      // Reset calibration to make the clock reusable next time we use it
      gst_clock_set_calibration (self->output->clock, 0, 0, 1, 1);
      g_mutex_lock (&self->output->lock);
      self->output->clock_start_time = GST_CLOCK_TIME_NONE;
      self->output->clock_epoch += self->output->clock_last_time;
      self->output->clock_last_time = 0;
      self->output->clock_offset = 0;
      g_mutex_unlock (&self->output->lock);
      gst_decklink_video_sink_stop (self);
      break;
    case GST_STATE_CHANGE_PLAYING_TO_PAUSED:{
      GstClockTime start_time;
      HRESULT res;

      // FIXME: start time is the same for the complete pipeline,
      // but what we need here is the start time of this element!
      start_time = gst_element_get_base_time (element);
      if (start_time != GST_CLOCK_TIME_NONE)
        start_time = gst_clock_get_time (GST_ELEMENT_CLOCK (self)) - start_time;

      // FIXME: This will probably not work
      if (start_time == GST_CLOCK_TIME_NONE)
        start_time = 0;

      convert_to_internal_clock (self, &start_time, NULL);

      // The start time is now the running time when we stopped
      // playback

      GST_DEBUG_OBJECT (self,
          "Stopping scheduled playback at %" GST_TIME_FORMAT,
          GST_TIME_ARGS (start_time));

      g_mutex_lock (&self->output->lock);
      self->output->started = FALSE;
      g_mutex_unlock (&self->output->lock);
      res =
          self->output->output->StopScheduledPlayback (start_time, 0,
          GST_SECOND);
      if (res != S_OK) {
        GST_ELEMENT_ERROR (self, STREAM, FAILED,
            (NULL), ("Failed to stop scheduled playback: 0x%08x", res));
        ret = GST_STATE_CHANGE_FAILURE;
      }
      self->internal_base_time = GST_CLOCK_TIME_NONE;
      self->external_base_time = GST_CLOCK_TIME_NONE;
      break;
    }
    case GST_STATE_CHANGE_PAUSED_TO_PLAYING:{
      g_mutex_lock (&self->output->lock);
      if (self->output->start_scheduled_playback)
        self->output->start_scheduled_playback (self->output->videosink);
      g_mutex_unlock (&self->output->lock);
      break;
    }
    default:
      break;
  }

  return ret;
}