port_parameter_set
struct mmal_msg_port_parameter_set port_parameter_set;
m.u.port_parameter_set.component_handle = port->component->handle;
m.u.port_parameter_set.port_handle = port->handle;
m.u.port_parameter_set.id = parameter_id;
m.u.port_parameter_set.size = (2 * sizeof(u32)) + value_size;
memcpy(&m.u.port_parameter_set.value, value, value_size);
ret = port_parameter_set(instance, port, parameter, value, value_size);