small optimization, read-only buffer suffices here.
[ardour.git] / libs / ardour / io.cc
1 /*
2     Copyright (C) 2000-2006 Paul Davis
3
4     This program is free software; you can redistribute it and/or modify
5     it under the terms of the GNU General Public License as published by
6     the Free Software Foundation; either version 2 of the License, or
7     (at your option) any later version.
8
9     This program is distributed in the hope that it will be useful,
10     but WITHOUT ANY WARRANTY; without even the implied warranty of
11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12     GNU General Public License for more details.
13
14     You should have received a copy of the GNU General Public License
15     along with this program; if not, write to the Free Software
16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 #include <algorithm>
20 #include <cmath>
21 #include <vector>
22
23 #include <unistd.h>
24 #include <locale.h>
25 #include <errno.h>
26
27 #include <glibmm.h>
28 #include <glibmm/threads.h>
29
30 #include "pbd/xml++.h"
31 #include "pbd/replace_all.h"
32 #include "pbd/unknown_type.h"
33 #include "pbd/enumwriter.h"
34
35 #include "ardour/audioengine.h"
36 #include "ardour/buffer.h"
37 #include "ardour/buffer_set.h"
38 #include "ardour/debug.h"
39 #include "ardour/io.h"
40 #include "ardour/port.h"
41 #include "ardour/profile.h"
42 #include "ardour/route.h"
43 #include "ardour/session.h"
44 #include "ardour/user_bundle.h"
45
46 #include "i18n.h"
47
48 #define BLOCK_PROCESS_CALLBACK() Glib::Threads::Mutex::Lock em (AudioEngine::instance()->process_lock())
49
50 using namespace std;
51 using namespace ARDOUR;
52 using namespace PBD;
53
54 const string                 IO::state_node_name = "IO";
55 bool                         IO::connecting_legal = false;
56 PBD::Signal0<int>            IO::ConnectingLegal;
57 PBD::Signal1<void,ChanCount> IO::PortCountChanged;
58
59 /** @param default_type The type of port that will be created by ensure_io
60  * and friends if no type is explicitly requested (to avoid breakage).
61  */
62 IO::IO (Session& s, const string& name, Direction dir, DataType default_type, bool sendish)
63         : SessionObject (s, name)
64         , _direction (dir)
65         , _default_type (default_type)
66         , _sendish (sendish)
67 {
68         _active = true;
69         Port::PostDisconnect.connect_same_thread (*this, boost::bind (&IO::disconnect_check, this, _1, _2));
70         pending_state_node = 0;
71         setup_bundle ();
72 }
73
74 IO::IO (Session& s, const XMLNode& node, DataType dt, bool sendish)
75         : SessionObject(s, "unnamed io")
76         , _direction (Input)
77         , _default_type (dt)
78         , _sendish (sendish)
79 {
80         _active = true;
81         pending_state_node = 0;
82         Port::PostDisconnect.connect_same_thread (*this, boost::bind (&IO::disconnect_check, this, _1, _2));
83
84         set_state (node, Stateful::loading_state_version);
85         setup_bundle ();
86 }
87
88 IO::~IO ()
89 {
90         Glib::Threads::Mutex::Lock lm (io_lock);
91
92         BLOCK_PROCESS_CALLBACK ();
93
94         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
95                 _session.engine().unregister_port (*i);
96         }
97 }
98
99 void
100 IO::disconnect_check (boost::shared_ptr<Port> a, boost::shared_ptr<Port> b)
101 {
102         /* this could be called from within our own ::disconnect() method(s)
103            or from somewhere that operates directly on a port. so, we don't
104            know for sure if we can take this lock or not. if we fail,
105            we assume that its safely locked by our own ::disconnect().
106         */
107
108         Glib::Threads::Mutex::Lock tm (io_lock, Glib::Threads::TRY_LOCK);
109
110         if (tm.locked()) {
111                 /* we took the lock, so we cannot be here from inside
112                  * ::disconnect()
113                  */
114                 if (_ports.contains (a) || _ports.contains (b)) {
115                         changed (IOChange (IOChange::ConnectionsChanged), this); /* EMIT SIGNAL */
116                 }
117         } else {
118                 /* we didn't get the lock, so assume that we're inside
119                  * ::disconnect(), and it will call changed() appropriately.
120                  */
121         }
122 }
123
124 void
125 IO::increment_port_buffer_offset (pframes_t offset)
126 {
127         /* io_lock, not taken: function must be called from Session::process() calltree */
128
129         if (_direction == Output) {
130                 for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
131                         i->increment_port_buffer_offset (offset);
132                 }
133         }
134 }
135
136 void
137 IO::silence (framecnt_t nframes)
138 {
139         /* io_lock, not taken: function must be called from Session::process() calltree */
140
141         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
142                 i->get_buffer(nframes).silence (nframes);
143         }
144 }
145
146 /** Set _bundles_connected to those bundles that are connected such that every
147  *  port on every bundle channel x is connected to port x in _ports.
148  */
149 void
150 IO::check_bundles_connected ()
151 {
152         std::vector<UserBundleInfo*> new_list;
153
154         for (std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin(); i != _bundles_connected.end(); ++i) {
155
156                 uint32_t const N = (*i)->bundle->nchannels().n_total();
157
158                 if (_ports.num_ports() < N) {
159                         continue;
160                 }
161
162                 bool ok = true;
163
164                 for (uint32_t j = 0; j < N; ++j) {
165                         /* Every port on bundle channel j must be connected to our input j */
166                         Bundle::PortList const pl = (*i)->bundle->channel_ports (j);
167                         for (uint32_t k = 0; k < pl.size(); ++k) {
168                                 if (_ports.port(j)->connected_to (pl[k]) == false) {
169                                         ok = false;
170                                         break;
171                                 }
172                         }
173
174                         if (ok == false) {
175                                 break;
176                         }
177                 }
178
179                 if (ok) {
180                         new_list.push_back (*i);
181                 } else {
182                         delete *i;
183                 }
184         }
185
186         _bundles_connected = new_list;
187 }
188
189
190 int
191 IO::disconnect (boost::shared_ptr<Port> our_port, string other_port, void* src)
192 {
193         if (other_port.length() == 0 || our_port == 0) {
194                 return 0;
195         }
196
197         {
198                 Glib::Threads::Mutex::Lock lm (io_lock);
199
200                 /* check that our_port is really one of ours */
201
202                 if ( ! _ports.contains(our_port)) {
203                         return -1;
204                 }
205
206                 /* disconnect it from the source */
207
208                 if (our_port->disconnect (other_port)) {
209                         error << string_compose(_("IO: cannot disconnect port %1 from %2"), our_port->name(), other_port) << endmsg;
210                         return -1;
211                 }
212
213                 check_bundles_connected ();
214         }
215
216         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
217
218         _session.set_dirty ();
219
220         return 0;
221 }
222
223 int
224 IO::connect (boost::shared_ptr<Port> our_port, string other_port, void* src)
225 {
226         if (other_port.length() == 0 || our_port == 0) {
227                 return 0;
228         }
229
230         {
231                 Glib::Threads::Mutex::Lock lm (io_lock);
232
233                 /* check that our_port is really one of ours */
234
235                 if ( ! _ports.contains(our_port) ) {
236                         return -1;
237                 }
238
239                 /* connect it to the source */
240
241                 if (our_port->connect (other_port)) {
242                         return -1;
243                 }
244         }
245         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
246         _session.set_dirty ();
247         return 0;
248 }
249
250 int
251 IO::remove_port (boost::shared_ptr<Port> port, void* src)
252 {
253         ChanCount before = _ports.count ();
254         ChanCount after = before;
255         after.set (port->type(), after.get (port->type()) - 1);
256
257         boost::optional<bool> const r = PortCountChanging (after); /* EMIT SIGNAL */
258         if (r.get_value_or (false)) {
259                 return -1;
260         }
261
262         IOChange change;
263
264         {
265                 BLOCK_PROCESS_CALLBACK ();
266
267                 {
268                         Glib::Threads::Mutex::Lock lm (io_lock);
269
270                         if (_ports.remove(port)) {
271                                 change.type = IOChange::Type (change.type | IOChange::ConfigurationChanged);
272                                 change.before = before;
273                                 change.after = _ports.count ();
274
275                                 if (port->connected()) {
276                                         change.type = IOChange::Type (change.type | IOChange::ConnectionsChanged);
277                                 }
278
279                                 _session.engine().unregister_port (port);
280                                 check_bundles_connected ();
281                         }
282                 }
283
284                 PortCountChanged (n_ports()); /* EMIT SIGNAL */
285
286                 if (change.type != IOChange::NoChange) {
287                         changed (change, src);
288                         _buffers.attach_buffers (_ports);
289                 }
290         }
291
292         if (change.type & IOChange::ConfigurationChanged) {
293                 setup_bundle ();
294         }
295
296         if (change.type == IOChange::NoChange) {
297                 return -1;
298         }
299
300         _session.set_dirty ();
301
302         return 0;
303 }
304
305 /** Add a port.
306  *
307  * @param destination Name of port to connect new port to.
308  * @param src Source for emitted ConfigurationChanged signal.
309  * @param type Data type of port.  Default value (NIL) will use this IO's default type.
310  */
311 int
312 IO::add_port (string destination, void* src, DataType type)
313 {
314         boost::shared_ptr<Port> our_port;
315
316         if (type == DataType::NIL) {
317                 type = _default_type;
318         }
319
320         ChanCount before = _ports.count ();
321         ChanCount after = before;
322         after.set (type, after.get (type) + 1);
323
324         bool const r = PortCountChanging (after); /* EMIT SIGNAL */
325         if (r) {
326                 return -1;
327         }
328
329         IOChange change;
330
331         {
332                 BLOCK_PROCESS_CALLBACK ();
333
334
335                 {
336                         Glib::Threads::Mutex::Lock lm (io_lock);
337
338                         /* Create a new port */
339
340                         string portname = build_legal_port_name (type);
341
342                         if (_direction == Input) {
343                                 if ((our_port = _session.engine().register_input_port (type, portname)) == 0) {
344                                         error << string_compose(_("IO: cannot register input port %1"), portname) << endmsg;
345                                         return -1;
346                                 }
347                         } else {
348                                 if ((our_port = _session.engine().register_output_port (type, portname)) == 0) {
349                                         error << string_compose(_("IO: cannot register output port %1"), portname) << endmsg;
350                                         return -1;
351                                 }
352                         }
353
354                         change.before = _ports.count ();
355                         _ports.add (our_port);
356                 }
357
358                 PortCountChanged (n_ports()); /* EMIT SIGNAL */
359                 change.type = IOChange::ConfigurationChanged;
360                 change.after = _ports.count ();
361                 changed (change, src); /* EMIT SIGNAL */
362                 _buffers.attach_buffers (_ports);
363         }
364
365         if (!destination.empty()) {
366                 if (our_port->connect (destination)) {
367                         return -1;
368                 }
369         }
370
371         setup_bundle ();
372         _session.set_dirty ();
373
374         return 0;
375 }
376
377 int
378 IO::disconnect (void* src)
379 {
380         {
381                 Glib::Threads::Mutex::Lock lm (io_lock);
382
383                 for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
384                         i->disconnect_all ();
385                 }
386
387                 check_bundles_connected ();
388         }
389
390         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
391
392         return 0;
393 }
394
395 /** Caller must hold process lock */
396 int
397 IO::ensure_ports_locked (ChanCount count, bool clear, bool& changed)
398 {
399 #ifndef PLATFORM_WINDOWS
400         assert (!AudioEngine::instance()->process_lock().trylock());
401 #endif
402
403         boost::shared_ptr<Port> port;
404
405         changed    = false;
406
407         for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
408
409                 const size_t n = count.get(*t);
410
411                 /* remove unused ports */
412                 for (size_t i = n_ports().get(*t); i > n; --i) {
413                         port = _ports.port(*t, i-1);
414
415                         assert(port);
416                         _ports.remove(port);
417                         _session.engine().unregister_port (port);
418
419                         changed = true;
420                 }
421
422                 /* create any necessary new ports */
423                 while (n_ports().get(*t) < n) {
424
425                         string portname = build_legal_port_name (*t);
426
427                         try {
428
429                                 if (_direction == Input) {
430                                         if ((port = _session.engine().register_input_port (*t, portname)) == 0) {
431                                                 error << string_compose(_("IO: cannot register input port %1"), portname) << endmsg;
432                                                 return -1;
433                                         }
434                                 } else {
435                                         if ((port = _session.engine().register_output_port (*t, portname)) == 0) {
436                                                 error << string_compose(_("IO: cannot register output port %1"), portname) << endmsg;
437                                                 return -1;
438                                         }
439                                 }
440                         }
441
442                         catch (AudioEngine::PortRegistrationFailure& err) {
443                                 /* pass it on */
444                                 throw;
445                         }
446
447                         _ports.add (port);
448                         changed = true;
449                 }
450         }
451
452         if (changed) {
453                 check_bundles_connected ();
454                 PortCountChanged (n_ports()); /* EMIT SIGNAL */
455                 _session.set_dirty ();
456         }
457
458         if (clear) {
459                 /* disconnect all existing ports so that we get a fresh start */
460                 for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
461                         i->disconnect_all ();
462                 }
463         }
464
465         return 0;
466 }
467
468 /** Caller must hold process lock */
469 int
470 IO::ensure_ports (ChanCount count, bool clear, void* src)
471 {
472 #ifndef PLATFORM_WINDOWS
473         assert (!AudioEngine::instance()->process_lock().trylock());
474 #endif
475
476         bool changed = false;
477
478         if (count == n_ports() && !clear) {
479                 return 0;
480         }
481
482         IOChange change;
483
484         change.before = _ports.count ();
485
486         {
487                 Glib::Threads::Mutex::Lock im (io_lock);
488                 if (ensure_ports_locked (count, clear, changed)) {
489                         return -1;
490                 }
491         }
492
493         if (changed) {
494                 change.after = _ports.count ();
495                 change.type = IOChange::ConfigurationChanged;
496                 this->changed (change, src); /* EMIT SIGNAL */
497                 _buffers.attach_buffers (_ports);
498                 setup_bundle ();
499                 _session.set_dirty ();
500         }
501
502         return 0;
503 }
504
505 /** Caller must hold process lock */
506 int
507 IO::ensure_io (ChanCount count, bool clear, void* src)
508 {
509 #ifndef PLATFORM_WINDOWS
510         assert (!AudioEngine::instance()->process_lock().trylock());
511 #endif
512
513         return ensure_ports (count, clear, src);
514 }
515
516 XMLNode&
517 IO::get_state ()
518 {
519         return state (true);
520 }
521
522 XMLNode&
523 IO::state (bool /*full_state*/)
524 {
525         XMLNode* node = new XMLNode (state_node_name);
526         char buf[64];
527         string str;
528         int n;
529         LocaleGuard lg (X_("C"));
530         Glib::Threads::Mutex::Lock lm (io_lock);
531
532         node->add_property("name", _name);
533         id().print (buf, sizeof (buf));
534         node->add_property("id", buf);
535         node->add_property ("direction", enum_2_string (_direction));
536         node->add_property ("default-type", _default_type.to_string());
537
538         for (std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin(); i != _bundles_connected.end(); ++i) {
539                 XMLNode* n = new XMLNode ("Bundle");
540                 n->add_property ("name", (*i)->bundle->name ());
541                 node->add_child_nocopy (*n);
542         }
543
544         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
545
546                 vector<string> connections;
547
548                 XMLNode* pnode = new XMLNode (X_("Port"));
549                 pnode->add_property (X_("type"), i->type().to_string());
550                 pnode->add_property (X_("name"), i->name());
551
552                 if (i->get_connections (connections)) {
553                         vector<string>::const_iterator ci;
554                         std::sort (connections.begin(), connections.end());
555
556                         for (n = 0, ci = connections.begin(); ci != connections.end(); ++ci, ++n) {
557
558                                 /* if its a connection to our own port,
559                                    return only the port name, not the
560                                    whole thing. this allows connections
561                                    to be re-established even when our
562                                    client name is different.
563                                 */
564
565                                 XMLNode* cnode = new XMLNode (X_("Connection"));
566
567                                 cnode->add_property (X_("other"), _session.engine().make_port_name_relative (*ci));
568                                 pnode->add_child_nocopy (*cnode);
569                         }
570                 }
571
572                 node->add_child_nocopy (*pnode);
573         }
574
575         snprintf (buf, sizeof (buf), "%" PRId64, _user_latency);
576         node->add_property (X_("user-latency"), buf);
577
578         return *node;
579 }
580
581 int
582 IO::set_state (const XMLNode& node, int version)
583 {
584         /* callers for version < 3000 need to call set_state_2X directly, as A3 IOs
585          * are input OR output, not both, so the direction needs to be specified
586          * by the caller.
587          */
588         assert (version >= 3000);
589
590         const XMLProperty* prop;
591         XMLNodeConstIterator iter;
592         LocaleGuard lg (X_("C"));
593
594         /* force use of non-localized representation of decimal point,
595            since we use it a lot in XML files and so forth.
596         */
597
598         if (node.name() != state_node_name) {
599                 error << string_compose(_("incorrect XML node \"%1\" passed to IO object"), node.name()) << endmsg;
600                 return -1;
601         }
602
603         if ((prop = node.property ("name")) != 0) {
604                 set_name (prop->value());
605         }
606
607         if ((prop = node.property (X_("default-type"))) != 0) {
608                 _default_type = DataType(prop->value());
609                 assert(_default_type != DataType::NIL);
610         }
611
612         set_id (node);
613
614         if ((prop = node.property ("direction")) != 0) {
615                 _direction = (Direction) string_2_enum (prop->value(), _direction);
616         }
617
618         if (create_ports (node, version)) {
619                 return -1;
620         }
621
622         if (connecting_legal) {
623
624                 if (make_connections (node, version, false)) {
625                         return -1;
626                 }
627
628         } else {
629
630                 pending_state_node = new XMLNode (node);
631                 pending_state_node_version = version;
632                 pending_state_node_in = false;
633                 ConnectingLegal.connect_same_thread (connection_legal_c, boost::bind (&IO::connecting_became_legal, this));
634         }
635
636         if ((prop = node.property ("user-latency")) != 0) {
637                 _user_latency = atoi (prop->value ());
638         }
639
640         return 0;
641 }
642
643 int
644 IO::set_state_2X (const XMLNode& node, int version, bool in)
645 {
646         const XMLProperty* prop;
647         XMLNodeConstIterator iter;
648         LocaleGuard lg (X_("C"));
649
650         /* force use of non-localized representation of decimal point,
651            since we use it a lot in XML files and so forth.
652         */
653
654         if (node.name() != state_node_name) {
655                 error << string_compose(_("incorrect XML node \"%1\" passed to IO object"), node.name()) << endmsg;
656                 return -1;
657         }
658
659         if ((prop = node.property ("name")) != 0) {
660                 set_name (prop->value());
661         }
662
663         if ((prop = node.property (X_("default-type"))) != 0) {
664                 _default_type = DataType(prop->value());
665                 assert(_default_type != DataType::NIL);
666         }
667
668         set_id (node);
669
670         _direction = in ? Input : Output;
671
672         if (create_ports (node, version)) {
673                 return -1;
674         }
675
676         if (connecting_legal) {
677
678                 if (make_connections_2X (node, version, in)) {
679                         return -1;
680                 }
681
682         } else {
683
684                 pending_state_node = new XMLNode (node);
685                 pending_state_node_version = version;
686                 pending_state_node_in = in;
687                 ConnectingLegal.connect_same_thread (connection_legal_c, boost::bind (&IO::connecting_became_legal, this));
688         }
689
690         return 0;
691 }
692
693 int
694 IO::connecting_became_legal ()
695 {
696         int ret = 0;
697
698         assert (pending_state_node);
699
700         connection_legal_c.disconnect ();
701
702     // it's not required for TracksLive, as long as TracksLive's session does all the connections when it's being loaded
703     if (!Profile->get_trx() ) {
704         ret = make_connections (*pending_state_node, pending_state_node_version, pending_state_node_in);
705     }
706
707         delete pending_state_node;
708         pending_state_node = 0;
709
710         return ret;
711 }
712
713 boost::shared_ptr<Bundle>
714 IO::find_possible_bundle (const string &desired_name)
715 {
716         static const string digits = "0123456789";
717         const string &default_name = (_direction == Input ? _("in") : _("out"));
718         const string &bundle_type_name = (_direction == Input ? _("input") : _("output"));
719
720         boost::shared_ptr<Bundle> c = _session.bundle_by_name (desired_name);
721
722         if (!c) {
723                 int bundle_number, mask;
724                 string possible_name;
725                 bool stereo = false;
726                 string::size_type last_non_digit_pos;
727
728                 error << string_compose(_("Unknown bundle \"%1\" listed for %2 of %3"), desired_name, bundle_type_name, _name)
729                       << endmsg;
730
731                 // find numeric suffix of desired name
732                 bundle_number = 0;
733
734                 last_non_digit_pos = desired_name.find_last_not_of(digits);
735
736                 if (last_non_digit_pos != string::npos) {
737                         stringstream s;
738                         s << desired_name.substr(last_non_digit_pos);
739                         s >> bundle_number;
740                 }
741
742                 // see if it's a stereo connection e.g. "in 3+4"
743
744                 if (last_non_digit_pos > 1 && desired_name[last_non_digit_pos] == '+') {
745                         string::size_type left_last_non_digit_pos;
746
747                         left_last_non_digit_pos = desired_name.find_last_not_of(digits, last_non_digit_pos-1);
748
749                         if (left_last_non_digit_pos != string::npos) {
750                                 int left_bundle_number = 0;
751                                 stringstream s;
752                                 s << desired_name.substr(left_last_non_digit_pos, last_non_digit_pos-1);
753                                 s >> left_bundle_number;
754
755                                 if (left_bundle_number > 0 && left_bundle_number + 1 == bundle_number) {
756                                         bundle_number--;
757                                         stereo = true;
758                                 }
759                         }
760                 }
761
762                 // make 0-based
763                 if (bundle_number)
764                         bundle_number--;
765
766                 // find highest set bit
767                 mask = 1;
768                 while ((mask <= bundle_number) && (mask <<= 1)) {}
769
770                 // "wrap" bundle number into largest possible power of 2
771                 // that works...
772
773                 while (mask) {
774
775                         if (bundle_number & mask) {
776                                 bundle_number &= ~mask;
777
778                                 stringstream s;
779                                 s << default_name << " " << bundle_number + 1;
780
781                                 if (stereo) {
782                                         s << "+" << bundle_number + 2;
783                                 }
784
785                                 possible_name = s.str();
786
787                                 if ((c = _session.bundle_by_name (possible_name)) != 0) {
788                                         break;
789                                 }
790                         }
791                         mask >>= 1;
792                 }
793                 if (c) {
794                         info << string_compose (_("Bundle %1 was not available - \"%2\" used instead"), desired_name, possible_name)
795                              << endmsg;
796                 } else {
797                         error << string_compose(_("No %1 bundles available as a replacement"), bundle_type_name)
798                               << endmsg;
799                 }
800
801         }
802
803         return c;
804
805 }
806
807 int
808 IO::get_port_counts_2X (XMLNode const & node, int /*version*/, ChanCount& n, boost::shared_ptr<Bundle>& /*c*/)
809 {
810         XMLProperty const * prop;
811         XMLNodeList children = node.children ();
812
813         uint32_t n_audio = 0;
814
815         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
816
817                 if ((prop = node.property ("inputs")) != 0 && _direction == Input) {
818                         n_audio = count (prop->value().begin(), prop->value().end(), '{');
819                 } else if ((prop = node.property ("input-connection")) != 0 && _direction == Input) {
820                         n_audio = 1;
821                 } else if ((prop = node.property ("outputs")) != 0 && _direction == Output) {
822                         n_audio = count (prop->value().begin(), prop->value().end(), '{');
823                 } else if ((prop = node.property ("output-connection")) != 0 && _direction == Output) {
824                         n_audio = 2;
825                 }
826         }
827
828         ChanCount cnt;
829         cnt.set_audio (n_audio);
830         n = ChanCount::max (n, cnt);
831
832         return 0;
833 }
834
835 int
836 IO::get_port_counts (const XMLNode& node, int version, ChanCount& n, boost::shared_ptr<Bundle>& c)
837 {
838         if (version < 3000) {
839                 return get_port_counts_2X (node, version, n, c);
840         }
841
842         XMLProperty const * prop;
843         XMLNodeConstIterator iter;
844         uint32_t n_audio = 0;
845         uint32_t n_midi = 0;
846         ChanCount cnt;
847
848         n = n_ports();
849
850         if ((prop = node.property ("connection")) != 0) {
851
852                 if ((c = find_possible_bundle (prop->value())) != 0) {
853                         n = ChanCount::max (n, c->nchannels());
854                 }
855                 return 0;
856         }
857
858         for (iter = node.children().begin(); iter != node.children().end(); ++iter) {
859
860                 if ((*iter)->name() == X_("Bundle")) {
861                         prop = (*iter)->property ("name");
862                         if ((c = find_possible_bundle (prop->value())) != 0) {
863                                 n = ChanCount::max (n, c->nchannels());
864                                 return 0;
865                         } else {
866                                 return -1;
867                         }
868                 }
869
870                 if ((*iter)->name() == X_("Port")) {
871                         prop = (*iter)->property (X_("type"));
872
873                         if (!prop) {
874                                 continue;
875                         }
876
877                         if (prop->value() == X_("audio")) {
878                                 cnt.set_audio (++n_audio);
879                         } else if (prop->value() == X_("midi")) {
880                                 cnt.set_midi (++n_midi);
881                         }
882                 }
883         }
884
885         n = ChanCount::max (n, cnt);
886         return 0;
887 }
888
889 int
890 IO::create_ports (const XMLNode& node, int version)
891 {
892         ChanCount n;
893         boost::shared_ptr<Bundle> c;
894
895         get_port_counts (node, version, n, c);
896
897         {
898                 Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
899
900                 if (ensure_ports (n, true, this)) {
901                         error << string_compose(_("%1: cannot create I/O ports"), _name) << endmsg;
902                         return -1;
903                 }
904         }
905
906         /* XXX use c */
907
908         return 0;
909 }
910
911 int
912 IO::make_connections (const XMLNode& node, int version, bool in)
913 {
914         if (version < 3000) {
915                 return make_connections_2X (node, version, in);
916         }
917
918         const XMLProperty* prop;
919
920         for (XMLNodeConstIterator i = node.children().begin(); i != node.children().end(); ++i) {
921
922                 if ((*i)->name() == "Bundle") {
923                         XMLProperty const * prop = (*i)->property ("name");
924                         if (prop) {
925                                 boost::shared_ptr<Bundle> b = find_possible_bundle (prop->value());
926                                 if (b) {
927                                         connect_ports_to_bundle (b, true, this);
928                                 }
929                         }
930
931                         return 0;
932                 }
933
934                 if ((*i)->name() == "Port") {
935
936                         prop = (*i)->property (X_("name"));
937
938                         if (!prop) {
939                                 continue;
940                         }
941
942                         boost::shared_ptr<Port> p = port_by_name (prop->value());
943
944                         if (p) {
945                                 for (XMLNodeConstIterator c = (*i)->children().begin(); c != (*i)->children().end(); ++c) {
946
947                                         XMLNode* cnode = (*c);
948
949                                         if (cnode->name() != X_("Connection")) {
950                                                 continue;
951                                         }
952
953                                         if ((prop = cnode->property (X_("other"))) == 0) {
954                                                 continue;
955                                         }
956
957                                         if (prop) {
958                                                 connect (p, prop->value(), this);
959                                         }
960                                 }
961                         }
962                 }
963         }
964
965         return 0;
966 }
967
968 void
969 IO::prepare_for_reset (XMLNode& node, const std::string& name)
970 {
971         /* reset name */
972         node.add_property ("name", name);
973
974         /* now find connections and reset the name of the port
975            in one so that when we re-use it it will match
976            the name of the thing we're applying it to.
977         */
978
979         XMLProperty* prop;
980         XMLNodeList children = node.children();
981
982         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
983
984                 if ((*i)->name() == "Port") {
985
986                         prop = (*i)->property (X_("name"));
987
988                         if (prop) {
989                                 string new_name;
990                                 string old = prop->value();
991                                 string::size_type slash = old.find ('/');
992
993                                 if (slash != string::npos) {
994                                         /* port name is of form: <IO-name>/<port-name> */
995
996                                         new_name = name;
997                                         new_name += old.substr (old.find ('/'));
998
999                                         prop->set_value (new_name);
1000                                 }
1001                         }
1002                 }
1003         }
1004 }
1005
1006
1007 int
1008 IO::make_connections_2X (const XMLNode& node, int /*version*/, bool in)
1009 {
1010         const XMLProperty* prop;
1011
1012         /* XXX: bundles ("connections" as was) */
1013
1014         if ((prop = node.property ("inputs")) != 0 && in) {
1015
1016                 string::size_type ostart = 0;
1017                 string::size_type start = 0;
1018                 string::size_type end = 0;
1019                 int i = 0;
1020                 int n;
1021                 vector<string> ports;
1022
1023                 string const str = prop->value ();
1024
1025                 while ((start = str.find_first_of ('{', ostart)) != string::npos) {
1026                         start += 1;
1027
1028                         if ((end = str.find_first_of ('}', start)) == string::npos) {
1029                                 error << string_compose(_("IO: badly formed string in XML node for inputs \"%1\""), str) << endmsg;
1030                                 return -1;
1031                         }
1032
1033                         if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1034                                 error << string_compose(_("bad input string in XML node \"%1\""), str) << endmsg;
1035
1036                                 return -1;
1037
1038                         } else if (n > 0) {
1039
1040
1041                                 for (int x = 0; x < n; ++x) {
1042                                         /* XXX: this is a bit of a hack; need to check if it's always valid */
1043                                         string::size_type const p = ports[x].find ("/out");
1044                                         if (p != string::npos) {
1045                                                 ports[x].replace (p, 4, "/audio_out");
1046                                         }
1047                                         if (NULL != nth(i).get())
1048                                                 nth(i)->connect (ports[x]);
1049                                 }
1050                         }
1051
1052                         ostart = end+1;
1053                         i++;
1054                 }
1055
1056         }
1057
1058         if ((prop = node.property ("outputs")) != 0 && !in) {
1059
1060                 string::size_type ostart = 0;
1061                 string::size_type start = 0;
1062                 string::size_type end = 0;
1063                 int i = 0;
1064                 int n;
1065                 vector<string> ports;
1066
1067                 string const str = prop->value ();
1068
1069                 while ((start = str.find_first_of ('{', ostart)) != string::npos) {
1070                         start += 1;
1071
1072                         if ((end = str.find_first_of ('}', start)) == string::npos) {
1073                                 error << string_compose(_("IO: badly formed string in XML node for outputs \"%1\""), str) << endmsg;
1074                                 return -1;
1075                         }
1076
1077                         if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1078                                 error << string_compose(_("IO: bad output string in XML node \"%1\""), str) << endmsg;
1079
1080                                 return -1;
1081
1082                         } else if (n > 0) {
1083
1084                                 for (int x = 0; x < n; ++x) {
1085                                         /* XXX: this is a bit of a hack; need to check if it's always valid */
1086                                         string::size_type const p = ports[x].find ("/in");
1087                                         if (p != string::npos) {
1088                                                 ports[x].replace (p, 3, "/audio_in");
1089                                         }
1090                                         if (NULL != nth(i).get())
1091                                                 nth(i)->connect (ports[x]);
1092                                 }
1093                         }
1094
1095                         ostart = end+1;
1096                         i++;
1097                 }
1098         }
1099
1100         return 0;
1101 }
1102
1103 int
1104 IO::set_ports (const string& str)
1105 {
1106         vector<string> ports;
1107         int n;
1108         uint32_t nports;
1109
1110         if ((nports = count (str.begin(), str.end(), '{')) == 0) {
1111                 return 0;
1112         }
1113
1114         {
1115                 Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
1116
1117                 // FIXME: audio-only
1118                 if (ensure_ports (ChanCount(DataType::AUDIO, nports), true, this)) {
1119                         return -1;
1120                 }
1121         }
1122
1123         string::size_type start  = 0;
1124         string::size_type end    = 0;
1125         string::size_type ostart = 0;
1126         for (int i = 0; (start = str.find_first_of ('{', ostart)) != string::npos; ++i) {
1127                 start += 1;
1128
1129                 if ((end = str.find_first_of ('}', start)) == string::npos) {
1130                         error << string_compose(_("IO: badly formed string in XML node for inputs \"%1\""), str) << endmsg;
1131                         return -1;
1132                 }
1133
1134                 if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1135                         error << string_compose(_("bad input string in XML node \"%1\""), str) << endmsg;
1136
1137                         return -1;
1138
1139                 } else if (n > 0) {
1140
1141                         for (int x = 0; x < n; ++x) {
1142                                 connect (nth (i), ports[x], this);
1143                         }
1144                 }
1145
1146                 ostart = end+1;
1147         }
1148
1149         return 0;
1150 }
1151
1152 int
1153 IO::parse_io_string (const string& str, vector<string>& ports)
1154 {
1155         string::size_type pos, opos;
1156
1157         if (str.length() == 0) {
1158                 return 0;
1159         }
1160
1161         opos = 0;
1162
1163         ports.clear ();
1164
1165         while ((pos = str.find_first_of (',', opos)) != string::npos) {
1166                 ports.push_back (str.substr (opos, pos - opos));
1167                 opos = pos + 1;
1168         }
1169
1170         if (opos < str.length()) {
1171                 ports.push_back (str.substr(opos));
1172         }
1173
1174         return ports.size();
1175 }
1176
1177 int
1178 IO::parse_gain_string (const string& str, vector<string>& ports)
1179 {
1180         string::size_type pos, opos;
1181
1182         opos = 0;
1183         ports.clear ();
1184
1185         while ((pos = str.find_first_of (',', opos)) != string::npos) {
1186                 ports.push_back (str.substr (opos, pos - opos));
1187                 opos = pos + 1;
1188         }
1189
1190         if (opos < str.length()) {
1191                 ports.push_back (str.substr(opos));
1192         }
1193
1194         return ports.size();
1195 }
1196
1197 bool
1198 IO::set_name (const string& requested_name)
1199 {
1200         string name = requested_name;
1201
1202         if (_name == name) {
1203                 return true;
1204         }
1205
1206         /* replace all colons in the name. i wish we didn't have to do this */
1207
1208         replace_all (name, ":", "-");
1209
1210         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
1211                 string current_name = i->name();
1212                 current_name.replace (current_name.find (_name), _name.val().length(), name);
1213                 i->set_name (current_name);
1214         }
1215
1216         bool const r = SessionObject::set_name (name);
1217
1218         setup_bundle ();
1219
1220         return r;
1221 }
1222
1223 framecnt_t
1224 IO::latency () const
1225 {
1226         framecnt_t max_latency;
1227         framecnt_t latency;
1228
1229         max_latency = 0;
1230
1231         /* io lock not taken - must be protected by other means */
1232
1233         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1234                 if ((latency = i->private_latency_range (_direction == Output).max) > max_latency) {
1235                         DEBUG_TRACE (DEBUG::Latency, string_compose ("port %1 has %2 latency of %3 - use\n",
1236                                                                      name(),
1237                                                                      ((_direction == Output) ? "PLAYBACK" : "CAPTURE"),
1238                                                                      latency));
1239                         max_latency = latency;
1240                 }
1241         }
1242
1243         DEBUG_TRACE (DEBUG::Latency, string_compose ("%1: max %4 latency from %2 ports = %3\n",
1244                                                      name(), _ports.num_ports(), max_latency,
1245                                                      ((_direction == Output) ? "PLAYBACK" : "CAPTURE")));
1246         return max_latency;
1247 }
1248
1249 int
1250 IO::connect_ports_to_bundle (boost::shared_ptr<Bundle> c, bool exclusive, void* src)
1251 {
1252         BLOCK_PROCESS_CALLBACK ();
1253
1254         {
1255                 Glib::Threads::Mutex::Lock lm2 (io_lock);
1256
1257                 if (exclusive) {
1258                         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
1259                                 i->disconnect_all ();
1260                         }
1261                 }
1262
1263                 c->connect (_bundle, _session.engine());
1264
1265                 /* If this is a UserBundle, make a note of what we've done */
1266
1267                 boost::shared_ptr<UserBundle> ub = boost::dynamic_pointer_cast<UserBundle> (c);
1268                 if (ub) {
1269
1270                         /* See if we already know about this one */
1271                         std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin();
1272                         while (i != _bundles_connected.end() && (*i)->bundle != ub) {
1273                                 ++i;
1274                         }
1275
1276                         if (i == _bundles_connected.end()) {
1277                                 /* We don't, so make a note */
1278                                 _bundles_connected.push_back (new UserBundleInfo (this, ub));
1279                         }
1280                 }
1281         }
1282
1283         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
1284         return 0;
1285 }
1286
1287 int
1288 IO::disconnect_ports_from_bundle (boost::shared_ptr<Bundle> c, void* src)
1289 {
1290         BLOCK_PROCESS_CALLBACK ();
1291
1292         {
1293                 Glib::Threads::Mutex::Lock lm2 (io_lock);
1294
1295                 c->disconnect (_bundle, _session.engine());
1296
1297                 /* If this is a UserBundle, make a note of what we've done */
1298
1299                 boost::shared_ptr<UserBundle> ub = boost::dynamic_pointer_cast<UserBundle> (c);
1300                 if (ub) {
1301
1302                         std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin();
1303                         while (i != _bundles_connected.end() && (*i)->bundle != ub) {
1304                                 ++i;
1305                         }
1306
1307                         if (i != _bundles_connected.end()) {
1308                                 delete *i;
1309                                 _bundles_connected.erase (i);
1310                         }
1311                 }
1312         }
1313
1314         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
1315         return 0;
1316 }
1317
1318
1319 int
1320 IO::disable_connecting ()
1321 {
1322         connecting_legal = false;
1323         return 0;
1324 }
1325
1326 int
1327 IO::enable_connecting ()
1328 {
1329         Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock());
1330         connecting_legal = true;
1331         boost::optional<int> r = ConnectingLegal ();
1332         return r.get_value_or (0);
1333 }
1334
1335 void
1336 IO::bundle_changed (Bundle::Change /*c*/)
1337 {
1338         /* XXX */
1339 //      connect_input_ports_to_bundle (_input_bundle, this);
1340 }
1341
1342
1343 string
1344 IO::build_legal_port_name (DataType type)
1345 {
1346         const int name_size = AudioEngine::instance()->port_name_size();
1347         int limit;
1348         string suffix;
1349
1350         if (type == DataType::AUDIO) {
1351                 suffix = X_("audio");
1352         } else if (type == DataType::MIDI) {
1353                 suffix = X_("midi");
1354         } else {
1355                 throw unknown_type();
1356         }
1357
1358         /* note that if "in" or "out" are translated it will break a session
1359            across locale switches because a port's connection list will
1360            show (old) translated names, but the current port name will
1361            use the (new) translated name.
1362         */
1363
1364         if (_sendish) {
1365                 if (_direction == Input) {
1366                         suffix += X_("_return");
1367                 } else {
1368                         suffix += X_("_send");
1369                 }
1370         } else {
1371                 if (_direction == Input) {
1372                         suffix += X_("_in");
1373                 } else {
1374                         suffix += X_("_out");
1375                 }
1376         }
1377
1378         // allow up to 4 digits for the output port number, plus the slash, suffix and extra space
1379
1380         limit = name_size - AudioEngine::instance()->my_name().length() - (suffix.length() + 5);
1381
1382         std::vector<char> buf1(name_size+1);
1383         std::vector<char> buf2(name_size+1);
1384
1385         /* colons are illegal in port names, so fix that */
1386
1387         string nom = _name.val();
1388         replace_all (nom, ":", ";");
1389
1390         snprintf (&buf1[0], name_size+1, ("%.*s/%s"), limit, nom.c_str(), suffix.c_str());
1391
1392         int port_number = find_port_hole (&buf1[0]);
1393         snprintf (&buf2[0], name_size+1, "%s %d", &buf1[0], port_number);
1394
1395         return string (&buf2[0]);
1396 }
1397
1398 int32_t
1399 IO::find_port_hole (const char* base)
1400 {
1401         /* CALLER MUST HOLD IO LOCK */
1402
1403         uint32_t n;
1404
1405         if (_ports.empty()) {
1406                 return 1;
1407         }
1408
1409         /* we only allow up to 4 characters for the port number
1410          */
1411
1412         for (n = 1; n < 9999; ++n) {
1413                 std::vector<char> buf (AudioEngine::instance()->port_name_size());
1414                 PortSet::iterator i = _ports.begin();
1415
1416                 snprintf (&buf[0], buf.size()+1, _("%s %u"), base, n);
1417
1418                 for ( ; i != _ports.end(); ++i) {
1419                         if (string(i->name()) == string(&buf[0])) {
1420                                 break;
1421                         }
1422                 }
1423
1424                 if (i == _ports.end()) {
1425                         break;
1426                 }
1427         }
1428         return n;
1429 }
1430
1431
1432 boost::shared_ptr<AudioPort>
1433 IO::audio(uint32_t n) const
1434 {
1435         return _ports.nth_audio_port (n);
1436
1437 }
1438
1439 boost::shared_ptr<MidiPort>
1440 IO::midi(uint32_t n) const
1441 {
1442         return _ports.nth_midi_port (n);
1443 }
1444
1445 /**
1446  *  Setup a bundle that describe our inputs or outputs. Also creates the bundle if necessary.
1447  */
1448
1449 void
1450 IO::setup_bundle ()
1451 {
1452         char buf[32];
1453
1454         if (!_bundle) {
1455                 _bundle.reset (new Bundle (_direction == Input));
1456         }
1457
1458         _bundle->suspend_signals ();
1459
1460         _bundle->remove_channels ();
1461
1462         if (_direction == Input) {
1463                 snprintf(buf, sizeof (buf), _("%s in"), _name.val().c_str());
1464         } else {
1465                 snprintf(buf, sizeof (buf), _("%s out"), _name.val().c_str());
1466         }
1467         _bundle->set_name (buf);
1468
1469         int c = 0;
1470         for (DataType::iterator i = DataType::begin(); i != DataType::end(); ++i) {
1471
1472                 uint32_t const N = _ports.count().get (*i);
1473                 for (uint32_t j = 0; j < N; ++j) {
1474                         _bundle->add_channel (bundle_channel_name (j, N, *i), *i);
1475                         _bundle->set_port (c, _session.engine().make_port_name_non_relative (_ports.port(*i, j)->name()));
1476                         ++c;
1477                 }
1478
1479         }
1480
1481         _bundle->resume_signals ();
1482 }
1483
1484 /** @return Bundles connected to our ports */
1485 BundleList
1486 IO::bundles_connected ()
1487 {
1488         BundleList bundles;
1489
1490         /* User bundles */
1491         for (std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin(); i != _bundles_connected.end(); ++i) {
1492                 bundles.push_back ((*i)->bundle);
1493         }
1494
1495         /* Session bundles */
1496         boost::shared_ptr<ARDOUR::BundleList> b = _session.bundles ();
1497         for (ARDOUR::BundleList::iterator i = b->begin(); i != b->end(); ++i) {
1498                 if ((*i)->connected_to (_bundle, _session.engine())) {
1499                         bundles.push_back (*i);
1500                 }
1501         }
1502
1503         /* Route bundles */
1504
1505         boost::shared_ptr<ARDOUR::RouteList> r = _session.get_routes ();
1506
1507         if (_direction == Input) {
1508                 for (ARDOUR::RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1509                         if ((*i)->output()->bundle()->connected_to (_bundle, _session.engine())) {
1510                                 bundles.push_back ((*i)->output()->bundle());
1511                         }
1512                 }
1513         } else {
1514                 for (ARDOUR::RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1515                         if ((*i)->input()->bundle()->connected_to (_bundle, _session.engine())) {
1516                                 bundles.push_back ((*i)->input()->bundle());
1517                         }
1518                 }
1519         }
1520
1521         return bundles;
1522 }
1523
1524
1525 IO::UserBundleInfo::UserBundleInfo (IO* io, boost::shared_ptr<UserBundle> b)
1526 {
1527         bundle = b;
1528         b->Changed.connect_same_thread (changed, boost::bind (&IO::bundle_changed, io, _1));
1529 }
1530
1531 std::string
1532 IO::bundle_channel_name (uint32_t c, uint32_t n, DataType t) const
1533 {
1534         char buf[32];
1535
1536         if (t == DataType::AUDIO) {
1537
1538                 switch (n) {
1539                 case 1:
1540                         return _("mono");
1541                 case 2:
1542                         return c == 0 ? _("L") : _("R");
1543                 default:
1544                         snprintf (buf, sizeof(buf), _("%d"), (c + 1));
1545                         return buf;
1546                 }
1547
1548         } else {
1549
1550                 snprintf (buf, sizeof(buf), _("%d"), (c + 1));
1551                 return buf;
1552
1553         }
1554
1555         return "";
1556 }
1557
1558 string
1559 IO::name_from_state (const XMLNode& node)
1560 {
1561         const XMLProperty* prop;
1562
1563         if ((prop = node.property ("name")) != 0) {
1564                 return prop->value();
1565         }
1566
1567         return string();
1568 }
1569
1570 void
1571 IO::set_name_in_state (XMLNode& node, const string& new_name)
1572 {
1573         node.add_property (X_("name"), new_name);
1574         XMLNodeList children = node.children ();
1575         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
1576                 if ((*i)->name() == X_("Port")) {
1577                         string const old_name = (*i)->property(X_("name"))->value();
1578                         string const old_name_second_part = old_name.substr (old_name.find_first_of ("/") + 1);
1579                         (*i)->add_property (X_("name"), string_compose ("%1/%2", new_name, old_name_second_part));
1580                 }
1581         }
1582 }
1583
1584 bool
1585 IO::connected () const
1586 {
1587         /* do we have any connections at all? */
1588
1589         for (PortSet::const_iterator p = _ports.begin(); p != _ports.end(); ++p) {
1590                 if (p->connected()) {
1591                         return true;
1592                 }
1593         }
1594
1595         return false;
1596 }
1597
1598 bool
1599 IO::connected_to (boost::shared_ptr<const IO> other) const
1600 {
1601         if (!other) {
1602                 return connected ();
1603         }
1604
1605         assert (_direction != other->direction());
1606
1607         uint32_t i, j;
1608         uint32_t no = n_ports().n_total();
1609         uint32_t ni = other->n_ports ().n_total();
1610
1611         for (i = 0; i < no; ++i) {
1612                 for (j = 0; j < ni; ++j) {
1613                         if ((NULL != nth(i).get()) && (NULL != other->nth(j).get())) {
1614                                 if (nth(i)->connected_to (other->nth(j)->name())) {
1615                                         return true;
1616                                 }
1617                         }
1618                 }
1619         }
1620
1621         return false;
1622 }
1623
1624 bool
1625 IO::connected_to (const string& str) const
1626 {
1627         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1628                 if (i->connected_to (str)) {
1629                         return true;
1630                 }
1631         }
1632
1633         return false;
1634 }
1635
1636 /** Call a processor's ::run() method, giving it our buffers
1637  *  Caller must hold process lock.
1638  */
1639 void
1640 IO::process_input (boost::shared_ptr<Processor> proc, framepos_t start_frame, framepos_t end_frame, pframes_t nframes)
1641 {
1642         /* don't read the data into new buffers - just use the port buffers directly */
1643
1644         if (n_ports().n_total() == 0) {
1645                 /* We have no ports, so nothing to process */
1646                 return;
1647         }
1648
1649         _buffers.get_backend_port_addresses (_ports, nframes);
1650         if (proc) {
1651                 proc->run (_buffers, start_frame, end_frame, nframes, true);
1652         }
1653 }
1654
1655 void
1656 IO::collect_input (BufferSet& bufs, pframes_t nframes, ChanCount offset)
1657 {
1658         assert(bufs.available() >= _ports.count());
1659
1660         if (_ports.count() == ChanCount::ZERO) {
1661                 return;
1662         }
1663
1664         bufs.set_count (_ports.count());
1665
1666         for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
1667                 PortSet::iterator   i = _ports.begin(*t);
1668                 BufferSet::iterator b = bufs.begin(*t);
1669
1670                 for (uint32_t off = 0; off < offset.get(*t); ++off, ++b) {
1671                         if (b == bufs.end(*t)) {
1672                                 continue;
1673                         }
1674                 }
1675
1676                 for ( ; i != _ports.end(*t); ++i, ++b) {
1677                         const Buffer& bb (i->get_buffer (nframes));
1678                         b->read_from (bb, nframes);
1679                 }
1680         }
1681 }
1682
1683 void
1684 IO::copy_to_outputs (BufferSet& bufs, DataType type, pframes_t nframes, framecnt_t offset)
1685 {
1686         // Copy any buffers 1:1 to outputs
1687
1688         PortSet::iterator o = _ports.begin(type);
1689         BufferSet::iterator i = bufs.begin(type);
1690         BufferSet::iterator prev = i;
1691
1692         while (i != bufs.end(type) && o != _ports.end (type)) {
1693                 Buffer& port_buffer (o->get_buffer (nframes));
1694                 port_buffer.read_from (*i, nframes, offset);
1695                 prev = i;
1696                 ++i;
1697                 ++o;
1698         }
1699
1700         // Copy last buffer to any extra outputs
1701
1702         while (o != _ports.end(type)) {
1703                 Buffer& port_buffer (o->get_buffer (nframes));
1704                 port_buffer.read_from (*prev, nframes, offset);
1705                 ++o;
1706         }
1707 }
1708
1709 boost::shared_ptr<Port>
1710 IO::port_by_name (const std::string& str) const
1711 {
1712         /* to be called only from ::set_state() - no locking */
1713
1714         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1715
1716                 if (i->name() == str) {
1717                         return boost::const_pointer_cast<Port> (*i);
1718                 }
1719         }
1720
1721         return boost::shared_ptr<Port> ();
1722 }
1723
1724 bool
1725 IO::physically_connected () const
1726 {
1727         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1728                 if (i->physically_connected()) {
1729                         return true;
1730                 }
1731         }
1732
1733         return false;
1734 }
1735
1736 bool
1737 IO::has_port (boost::shared_ptr<Port> p) const
1738 {
1739         Glib::Threads::Mutex::Lock lm (io_lock);
1740         return _ports.contains (p);
1741 }