port_info_get
struct mmal_msg_port_info_get port_info_get;
ret = port_info_get(instance, port);
ret = port_info_get(instance, port);
ret = port_info_get(instance, port);
ret = port_info_get(instance, dst);
ret = port_info_get(instance, &component->control);
ret = port_info_get(instance, &component->input[idx]);
ret = port_info_get(instance, &component->output[idx]);
ret = port_info_get(instance, &component->clock[idx]);
m.u.port_info_get.component_handle = port->component->handle;
m.u.port_info_get.port_type = port->type;
m.u.port_info_get.index = port->index;
sizeof(m.u.port_info_get),