port_action_handle
struct mmal_msg_port_action_handle port_action_handle;
m.u.port_action_handle.component_handle = port->component->handle;
m.u.port_action_handle.port_handle = port->handle;
m.u.port_action_handle.action = action_type;
m.u.port_action_handle.connect_component_handle =
m.u.port_action_handle.connect_port_handle = connect_port_handle;
sizeof(m.u.port_action_handle),
ret = port_action_handle(instance, src,
ret = port_action_handle(instance, src,