- {
- Glib::Threads::Mutex::Lock lx (AudioEngine::instance()->process_lock ());
- Glib::Threads::RWLock::WriterLock lm (_processor_lock);
- ProcessorState pstate (this);
-
- boost::shared_ptr<PluginInsert> pi;
- boost::shared_ptr<PortInsert> porti;
-
- if (processor == _amp) {
- /* Ensure that only one amp is in the list at any time */
- ProcessorList::iterator check = find (_processors.begin(), _processors.end(), processor);
- if (check != _processors.end()) {
- if (before == _amp) {
- /* Already in position; all is well */
- return 0;
- } else {
- _processors.erase (check);
- }
- }
- }
-
- assert (find (_processors.begin(), _processors.end(), processor) == _processors.end ());
-
- ProcessorList::iterator loc;
- if (before) {
- /* inserting before a processor; find it */
- loc = find (_processors.begin(), _processors.end(), before);
- if (loc == _processors.end ()) {
- /* Not found */
- return 1;
- }
- } else {
- /* inserting at end */
- loc = _processors.end ();
- }
-
- _processors.insert (loc, processor);
- processor->set_owner (this);
-
- // Set up processor list channels. This will set processor->[input|output]_streams(),
- // configure redirect ports properly, etc.
-
- {
- if (configure_processors_unlocked (err, &lm)) {
- pstate.restore ();
- configure_processors_unlocked (0, &lm); // it worked before we tried to add it ...
- return -1;
- }
- }
-
- if ((pi = boost::dynamic_pointer_cast<PluginInsert>(processor)) != 0) {
-
- if (pi->has_no_inputs ()) {
- /* generator plugin */
- _have_internal_generator = true;
- }
-
- }
-
- if (activation_allowed && (!_session.get_bypass_all_loaded_plugins () || !processor->display_to_user ())) {
- processor->activate ();
- }
-
- processor->ActiveChanged.connect_same_thread (*this, boost::bind (&Session::update_latency_compensation, &_session, false));
-
- _output->set_user_latency (0);