Support for I-Frame Request

[gstreader]

 I know there is an event GstForceKeyUnit to handle dynamic
key-frame/I-frame request.

 Could some one explain me what these
portion of code does in gstx264enc.c in gst-plugins-ugly-0.10.18 ??

if (gst_structure_has_name (s, "GstForceKeyUnit")) {
        /* Set I frame request */
        GST_OBJECT_LOCK (encoder);
        encoder->i_type = X264_TYPE_I;
        encoder->forcekeyunit_event = gst_event_copy (event);
        GST_EVENT_TYPE (encoder->forcekeyunit_event) =
            GST_EVENT_CUSTOM_DOWNSTREAM;
        GST_OBJECT_UNLOCK (encoder);
        forward = FALSE;
        gst_event_unref (event);
      }




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