Parse a #GstNavigation message of type GST_NAVIGATION_MESSAGE_ANGLES_CHANGED and extract the cur_angle and n_angles parameters.
A #GstMessage to inspect.
A pointer to a #guint to receive the new current angle number, or NULL
A pointer to a #guint to receive the new angle count, or NULL.
true if the message could be successfully parsed. false if not.
Parse a #GstNavigation message of type GST_NAVIGATION_MESSAGE_ANGLES_CHANGED and extract the cur_angle and n_angles parameters.