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 <fstream>
  20 #include <algorithm>
  21 #include <cmath>
  22 #include <vector>
  23
  24 #include <unistd.h>
  25 #include <locale.h>
  26 #include <errno.h>
  27
  28 #include <glibmm.h>
  29 #include <glibmm/threads.h>
  30
  31 #include "pbd/xml++.h"
  32 #include "pbd/replace_all.h"
  33 #include "pbd/unknown_type.h"
  34 #include "pbd/enumwriter.h"
  35
  36 #include "ardour/audioengine.h"
  37 #include "ardour/buffer.h"
  38 #include "ardour/buffer_set.h"
  39 #include "ardour/debug.h"
  40 #include "ardour/io.h"
  41 #include "ardour/port.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         vector<string>::iterator ci;
 529         int n;
 530         LocaleGuard lg (X_("POSIX"));
 531         Glib::Threads::Mutex::Lock lm (io_lock);
 532
 533         node->add_property("name", _name);
 534         id().print (buf, sizeof (buf));
 535         node->add_property("id", buf);
 536         node->add_property ("direction", enum_2_string (_direction));
 537         node->add_property ("default-type", _default_type.to_string());
 538
 539         for (std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin(); i != _bundles_connected.end(); ++i) {
 540                 XMLNode* n = new XMLNode ("Bundle");
 541                 n->add_property ("name", (*i)->bundle->name ());
 542                 node->add_child_nocopy (*n);
 543         }
 544
 545         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
 546
 547                 vector<string> connections;
 548
 549                 XMLNode* pnode = new XMLNode (X_("Port"));
 550                 pnode->add_property (X_("type"), i->type().to_string());
 551                 pnode->add_property (X_("name"), i->name());
 552
 553                 if (i->get_connections (connections)) {
 554
 555                         for (n = 0, ci = connections.begin(); ci != connections.end(); ++ci, ++n) {
 556
 557                                 /* if its a connection to our own port,
 558                                    return only the port name, not the
 559                                    whole thing. this allows connections
 560                                    to be re-established even when our
 561                                    client name is different.
 562                                 */
 563
 564                                 XMLNode* cnode = new XMLNode (X_("Connection"));
 565
 566                                 cnode->add_property (X_("other"), _session.engine().make_port_name_relative (*ci));
 567                                 pnode->add_child_nocopy (*cnode);
 568                         }
 569                 }
 570
 571                 node->add_child_nocopy (*pnode);
 572         }
 573
 574         snprintf (buf, sizeof (buf), "%" PRId64, _user_latency);
 575         node->add_property (X_("user-latency"), buf);
 576
 577         return *node;
 578 }
 579
 580 int
 581 IO::set_state (const XMLNode& node, int version)
 582 {
 583         /* callers for version < 3000 need to call set_state_2X directly, as A3 IOs
 584          * are input OR output, not both, so the direction needs to be specified
 585          * by the caller.
 586          */
 587         assert (version >= 3000);
 588
 589         const XMLProperty* prop;
 590         XMLNodeConstIterator iter;
 591         LocaleGuard lg (X_("POSIX"));
 592
 593         /* force use of non-localized representation of decimal point,
 594            since we use it a lot in XML files and so forth.
 595         */
 596
 597         if (node.name() != state_node_name) {
 598                 error << string_compose(_("incorrect XML node \"%1\" passed to IO object"), node.name()) << endmsg;
 599                 return -1;
 600         }
 601
 602         if ((prop = node.property ("name")) != 0) {
 603                 set_name (prop->value());
 604         }
 605
 606         if ((prop = node.property (X_("default-type"))) != 0) {
 607                 _default_type = DataType(prop->value());
 608                 assert(_default_type != DataType::NIL);
 609         }
 610
 611         set_id (node);
 612
 613         if ((prop = node.property ("direction")) != 0) {
 614                 _direction = (Direction) string_2_enum (prop->value(), _direction);
 615         }
 616
 617         if (create_ports (node, version)) {
 618                 return -1;
 619         }
 620
 621         if (connecting_legal) {
 622
 623                 if (make_connections (node, version, false)) {
 624                         return -1;
 625                 }
 626
 627         } else {
 628
 629                 pending_state_node = new XMLNode (node);
 630                 pending_state_node_version = version;
 631                 pending_state_node_in = false;
 632                 ConnectingLegal.connect_same_thread (connection_legal_c, boost::bind (&IO::connecting_became_legal, this));
 633         }
 634
 635         if ((prop = node.property ("user-latency")) != 0) {
 636                 _user_latency = atoi (prop->value ());
 637         }
 638
 639         return 0;
 640 }
 641
 642 int
 643 IO::set_state_2X (const XMLNode& node, int version, bool in)
 644 {
 645         const XMLProperty* prop;
 646         XMLNodeConstIterator iter;
 647         LocaleGuard lg (X_("POSIX"));
 648
 649         /* force use of non-localized representation of decimal point,
 650            since we use it a lot in XML files and so forth.
 651         */
 652
 653         if (node.name() != state_node_name) {
 654                 error << string_compose(_("incorrect XML node \"%1\" passed to IO object"), node.name()) << endmsg;
 655                 return -1;
 656         }
 657
 658         if ((prop = node.property ("name")) != 0) {
 659                 set_name (prop->value());
 660         }
 661
 662         if ((prop = node.property (X_("default-type"))) != 0) {
 663                 _default_type = DataType(prop->value());
 664                 assert(_default_type != DataType::NIL);
 665         }
 666
 667         set_id (node);
 668
 669         _direction = in ? Input : Output;
 670
 671         if (create_ports (node, version)) {
 672                 return -1;
 673         }
 674
 675         if (connecting_legal) {
 676
 677                 if (make_connections_2X (node, version, in)) {
 678                         return -1;
 679                 }
 680
 681         } else {
 682
 683                 pending_state_node = new XMLNode (node);
 684                 pending_state_node_version = version;
 685                 pending_state_node_in = in;
 686                 ConnectingLegal.connect_same_thread (connection_legal_c, boost::bind (&IO::connecting_became_legal, this));
 687         }
 688
 689         return 0;
 690 }
 691
 692 int
 693 IO::connecting_became_legal ()
 694 {
 695         int ret;
 696
 697         assert (pending_state_node);
 698
 699         connection_legal_c.disconnect ();
 700
 701         ret = make_connections (*pending_state_node, pending_state_node_version, pending_state_node_in);
 702
 703         delete pending_state_node;
 704         pending_state_node = 0;
 705
 706         return ret;
 707 }
 708
 709 boost::shared_ptr<Bundle>
 710 IO::find_possible_bundle (const string &desired_name)
 711 {
 712         static const string digits = "0123456789";
 713         const string &default_name = (_direction == Input ? _("in") : _("out"));
 714         const string &bundle_type_name = (_direction == Input ? _("input") : _("output"));
 715
 716         boost::shared_ptr<Bundle> c = _session.bundle_by_name (desired_name);
 717
 718         if (!c) {
 719                 int bundle_number, mask;
 720                 string possible_name;
 721                 bool stereo = false;
 722                 string::size_type last_non_digit_pos;
 723
 724                 error << string_compose(_("Unknown bundle \"%1\" listed for %2 of %3"), desired_name, bundle_type_name, _name)
 725                       << endmsg;
 726
 727                 // find numeric suffix of desired name
 728                 bundle_number = 0;
 729
 730                 last_non_digit_pos = desired_name.find_last_not_of(digits);
 731
 732                 if (last_non_digit_pos != string::npos) {
 733                         stringstream s;
 734                         s << desired_name.substr(last_non_digit_pos);
 735                         s >> bundle_number;
 736                 }
 737
 738                 // see if it's a stereo connection e.g. "in 3+4"
 739
 740                 if (last_non_digit_pos > 1 && desired_name[last_non_digit_pos] == '+') {
 741                         string::size_type left_last_non_digit_pos;
 742
 743                         left_last_non_digit_pos = desired_name.find_last_not_of(digits, last_non_digit_pos-1);
 744
 745                         if (left_last_non_digit_pos != string::npos) {
 746                                 int left_bundle_number = 0;
 747                                 stringstream s;
 748                                 s << desired_name.substr(left_last_non_digit_pos, last_non_digit_pos-1);
 749                                 s >> left_bundle_number;
 750
 751                                 if (left_bundle_number > 0 && left_bundle_number + 1 == bundle_number) {
 752                                         bundle_number--;
 753                                         stereo = true;
 754                                 }
 755                         }
 756                 }
 757
 758                 // make 0-based
 759                 if (bundle_number)
 760                         bundle_number--;
 761
 762                 // find highest set bit
 763                 mask = 1;
 764                 while ((mask <= bundle_number) && (mask <<= 1)) {}
 765
 766                 // "wrap" bundle number into largest possible power of 2
 767                 // that works...
 768
 769                 while (mask) {
 770
 771                         if (bundle_number & mask) {
 772                                 bundle_number &= ~mask;
 773
 774                                 stringstream s;
 775                                 s << default_name << " " << bundle_number + 1;
 776
 777                                 if (stereo) {
 778                                         s << "+" << bundle_number + 2;
 779                                 }
 780
 781                                 possible_name = s.str();
 782
 783                                 if ((c = _session.bundle_by_name (possible_name)) != 0) {
 784                                         break;
 785                                 }
 786                         }
 787                         mask >>= 1;
 788                 }
 789                 if (c) {
 790                         info << string_compose (_("Bundle %1 was not available - \"%2\" used instead"), desired_name, possible_name)
 791                              << endmsg;
 792                 } else {
 793                         error << string_compose(_("No %1 bundles available as a replacement"), bundle_type_name)
 794                               << endmsg;
 795                 }
 796
 797         }
 798
 799         return c;
 800
 801 }
 802
 803 int
 804 IO::get_port_counts_2X (XMLNode const & node, int /*version*/, ChanCount& n, boost::shared_ptr<Bundle>& /*c*/)
 805 {
 806         XMLProperty const * prop;
 807         XMLNodeList children = node.children ();
 808
 809         uint32_t n_audio = 0;
 810
 811         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
 812
 813                 if ((prop = node.property ("inputs")) != 0 && _direction == Input) {
 814                         n_audio = count (prop->value().begin(), prop->value().end(), '{');
 815                 } else if ((prop = node.property ("input-connection")) != 0 && _direction == Input) {
 816                         n_audio = 1;
 817                 } else if ((prop = node.property ("outputs")) != 0 && _direction == Output) {
 818                         n_audio = count (prop->value().begin(), prop->value().end(), '{');
 819                 } else if ((prop = node.property ("output-connection")) != 0 && _direction == Output) {
 820                         n_audio = 2;
 821                 }
 822         }
 823
 824         ChanCount cnt;
 825         cnt.set_audio (n_audio);
 826         n = ChanCount::max (n, cnt);
 827
 828         return 0;
 829 }
 830
 831 int
 832 IO::get_port_counts (const XMLNode& node, int version, ChanCount& n, boost::shared_ptr<Bundle>& c)
 833 {
 834         if (version < 3000) {
 835                 return get_port_counts_2X (node, version, n, c);
 836         }
 837
 838         XMLProperty const * prop;
 839         XMLNodeConstIterator iter;
 840         uint32_t n_audio = 0;
 841         uint32_t n_midi = 0;
 842         ChanCount cnt;
 843
 844         n = n_ports();
 845
 846         if ((prop = node.property ("connection")) != 0) {
 847
 848                 if ((c = find_possible_bundle (prop->value())) != 0) {
 849                         n = ChanCount::max (n, c->nchannels());
 850                 }
 851                 return 0;
 852         }
 853
 854         for (iter = node.children().begin(); iter != node.children().end(); ++iter) {
 855
 856                 if ((*iter)->name() == X_("Bundle")) {
 857                         if ((c = find_possible_bundle (prop->value())) != 0) {
 858                                 n = ChanCount::max (n, c->nchannels());
 859                                 return 0;
 860                         } else {
 861                                 return -1;
 862                         }
 863                 }
 864
 865                 if ((*iter)->name() == X_("Port")) {
 866                         prop = (*iter)->property (X_("type"));
 867
 868                         if (!prop) {
 869                                 continue;
 870                         }
 871
 872                         if (prop->value() == X_("audio")) {
 873                                 cnt.set_audio (++n_audio);
 874                         } else if (prop->value() == X_("midi")) {
 875                                 cnt.set_midi (++n_midi);
 876                         }
 877                 }
 878         }
 879
 880         n = ChanCount::max (n, cnt);
 881         return 0;
 882 }
 883
 884 int
 885 IO::create_ports (const XMLNode& node, int version)
 886 {
 887         ChanCount n;
 888         boost::shared_ptr<Bundle> c;
 889
 890         get_port_counts (node, version, n, c);
 891
 892         {
 893                 Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
 894
 895                 if (ensure_ports (n, true, this)) {
 896                         error << string_compose(_("%1: cannot create I/O ports"), _name) << endmsg;
 897                         return -1;
 898                 }
 899         }
 900
 901         /* XXX use c */
 902
 903         return 0;
 904 }
 905
 906 int
 907 IO::make_connections (const XMLNode& node, int version, bool in)
 908 {
 909         if (version < 3000) {
 910                 return make_connections_2X (node, version, in);
 911         }
 912
 913         const XMLProperty* prop;
 914
 915         for (XMLNodeConstIterator i = node.children().begin(); i != node.children().end(); ++i) {
 916
 917                 if ((*i)->name() == "Bundle") {
 918                         XMLProperty const * prop = (*i)->property ("name");
 919                         if (prop) {
 920                                 boost::shared_ptr<Bundle> b = find_possible_bundle (prop->value());
 921                                 if (b) {
 922                                         connect_ports_to_bundle (b, true, this);
 923                                 }
 924                         }
 925
 926                         return 0;
 927                 }
 928
 929                 if ((*i)->name() == "Port") {
 930
 931                         prop = (*i)->property (X_("name"));
 932
 933                         if (!prop) {
 934                                 continue;
 935                         }
 936
 937                         boost::shared_ptr<Port> p = port_by_name (prop->value());
 938
 939                         if (p) {
 940                                 for (XMLNodeConstIterator c = (*i)->children().begin(); c != (*i)->children().end(); ++c) {
 941
 942                                         XMLNode* cnode = (*c);
 943
 944                                         if (cnode->name() != X_("Connection")) {
 945                                                 continue;
 946                                         }
 947
 948                                         if ((prop = cnode->property (X_("other"))) == 0) {
 949                                                 continue;
 950                                         }
 951
 952                                         if (prop) {
 953                                                 connect (p, prop->value(), this);
 954                                         }
 955                                 }
 956                         }
 957                 }
 958         }
 959
 960         return 0;
 961 }
 962
 963 void
 964 IO::prepare_for_reset (XMLNode& node, const std::string& name)
 965 {
 966         /* reset name */
 967         node.add_property ("name", name);
 968
 969         /* now find connections and reset the name of the port
 970            in one so that when we re-use it it will match
 971            the name of the thing we're applying it to.
 972         */
 973
 974         XMLProperty* prop;
 975         XMLNodeList children = node.children();
 976
 977         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
 978
 979                 if ((*i)->name() == "Port") {
 980
 981                         prop = (*i)->property (X_("name"));
 982
 983                         if (prop) {
 984                                 string new_name;
 985                                 string old = prop->value();
 986                                 string::size_type slash = old.find ('/');
 987
 988                                 if (slash != string::npos) {
 989                                         /* port name is of form: <IO-name>/<port-name> */
 990
 991                                         new_name = name;
 992                                         new_name += old.substr (old.find ('/'));
 993
 994                                         prop->set_value (new_name);
 995                                 }
 996                         }
 997                 }
 998         }
 999 }
1000
1001
1002 int
1003 IO::make_connections_2X (const XMLNode& node, int /*version*/, bool in)
1004 {
1005         const XMLProperty* prop;
1006
1007         /* XXX: bundles ("connections" as was) */
1008
1009         if ((prop = node.property ("inputs")) != 0 && in) {
1010
1011                 string::size_type ostart = 0;
1012                 string::size_type start = 0;
1013                 string::size_type end = 0;
1014                 int i = 0;
1015                 int n;
1016                 vector<string> ports;
1017
1018                 string const str = prop->value ();
1019
1020                 while ((start = str.find_first_of ('{', ostart)) != string::npos) {
1021                         start += 1;
1022
1023                         if ((end = str.find_first_of ('}', start)) == string::npos) {
1024                                 error << string_compose(_("IO: badly formed string in XML node for inputs \"%1\""), str) << endmsg;
1025                                 return -1;
1026                         }
1027
1028                         if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1029                                 error << string_compose(_("bad input string in XML node \"%1\""), str) << endmsg;
1030
1031                                 return -1;
1032
1033                         } else if (n > 0) {
1034
1035
1036                                 for (int x = 0; x < n; ++x) {
1037                                         /* XXX: this is a bit of a hack; need to check if it's always valid */
1038                                         string::size_type const p = ports[x].find ("/out");
1039                                         if (p != string::npos) {
1040                                                 ports[x].replace (p, 4, "/audio_out");
1041                                         }
1042                                         nth(i)->connect (ports[x]);
1043                                 }
1044                         }
1045
1046                         ostart = end+1;
1047                         i++;
1048                 }
1049
1050         }
1051
1052         if ((prop = node.property ("outputs")) != 0 && !in) {
1053
1054                 string::size_type ostart = 0;
1055                 string::size_type start = 0;
1056                 string::size_type end = 0;
1057                 int i = 0;
1058                 int n;
1059                 vector<string> ports;
1060
1061                 string const str = prop->value ();
1062
1063                 while ((start = str.find_first_of ('{', ostart)) != string::npos) {
1064                         start += 1;
1065
1066                         if ((end = str.find_first_of ('}', start)) == string::npos) {
1067                                 error << string_compose(_("IO: badly formed string in XML node for outputs \"%1\""), str) << endmsg;
1068                                 return -1;
1069                         }
1070
1071                         if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1072                                 error << string_compose(_("IO: bad output string in XML node \"%1\""), str) << endmsg;
1073
1074                                 return -1;
1075
1076                         } else if (n > 0) {
1077
1078                                 for (int x = 0; x < n; ++x) {
1079                                         /* XXX: this is a bit of a hack; need to check if it's always valid */
1080                                         string::size_type const p = ports[x].find ("/in");
1081                                         if (p != string::npos) {
1082                                                 ports[x].replace (p, 3, "/audio_in");
1083                                         }
1084                                         nth(i)->connect (ports[x]);
1085                                 }
1086                         }
1087
1088                         ostart = end+1;
1089                         i++;
1090                 }
1091         }
1092
1093         return 0;
1094 }
1095
1096 int
1097 IO::set_ports (const string& str)
1098 {
1099         vector<string> ports;
1100         int i;
1101         int n;
1102         uint32_t nports;
1103
1104         if ((nports = count (str.begin(), str.end(), '{')) == 0) {
1105                 return 0;
1106         }
1107
1108         {
1109                 Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock ());
1110
1111                 // FIXME: audio-only
1112                 if (ensure_ports (ChanCount(DataType::AUDIO, nports), true, this)) {
1113                         return -1;
1114                 }
1115         }
1116
1117         string::size_type start, end, ostart;
1118
1119         ostart = 0;
1120         start = 0;
1121         end = 0;
1122         i = 0;
1123
1124         while ((start = str.find_first_of ('{', ostart)) != string::npos) {
1125                 start += 1;
1126
1127                 if ((end = str.find_first_of ('}', start)) == string::npos) {
1128                         error << string_compose(_("IO: badly formed string in XML node for inputs \"%1\""), str) << endmsg;
1129                         return -1;
1130                 }
1131
1132                 if ((n = parse_io_string (str.substr (start, end - start), ports)) < 0) {
1133                         error << string_compose(_("bad input string in XML node \"%1\""), str) << endmsg;
1134
1135                         return -1;
1136
1137                 } else if (n > 0) {
1138
1139                         for (int x = 0; x < n; ++x) {
1140                                 connect (nth (i), ports[x], this);
1141                         }
1142                 }
1143
1144                 ostart = end+1;
1145                 i++;
1146         }
1147
1148         return 0;
1149 }
1150
1151 int
1152 IO::parse_io_string (const string& str, vector<string>& ports)
1153 {
1154         string::size_type pos, opos;
1155
1156         if (str.length() == 0) {
1157                 return 0;
1158         }
1159
1160         pos = 0;
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         pos = 0;
1183         opos = 0;
1184         ports.clear ();
1185
1186         while ((pos = str.find_first_of (',', opos)) != string::npos) {
1187                 ports.push_back (str.substr (opos, pos - opos));
1188                 opos = pos + 1;
1189         }
1190
1191         if (opos < str.length()) {
1192                 ports.push_back (str.substr(opos));
1193         }
1194
1195         return ports.size();
1196 }
1197
1198 bool
1199 IO::set_name (const string& requested_name)
1200 {
1201         string name = requested_name;
1202
1203         if (_name == name) {
1204                 return true;
1205         }
1206
1207         /* replace all colons in the name. i wish we didn't have to do this */
1208
1209         replace_all (name, ":", "-");
1210
1211         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
1212                 string current_name = i->name();
1213                 current_name.replace (current_name.find (_name), _name.val().length(), name);
1214                 i->set_name (current_name);
1215         }
1216
1217         bool const r = SessionObject::set_name (name);
1218
1219         setup_bundle ();
1220
1221         return r;
1222 }
1223
1224 framecnt_t
1225 IO::latency () const
1226 {
1227         framecnt_t max_latency;
1228         framecnt_t latency;
1229
1230         max_latency = 0;
1231
1232         /* io lock not taken - must be protected by other means */
1233
1234         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1235                 if ((latency = i->private_latency_range (_direction == Output).max) > max_latency) {
1236                         DEBUG_TRACE (DEBUG::Latency, string_compose ("port %1 has %2 latency of %3 - use\n",
1237                                                                      name(),
1238                                                                      ((_direction == Output) ? "PLAYBACK" : "CAPTURE"),
1239                                                                      latency));
1240                         max_latency = latency;
1241                 }
1242         }
1243
1244         DEBUG_TRACE (DEBUG::Latency, string_compose ("%1: max %4 latency from %2 ports = %3\n",
1245                                                      name(), _ports.num_ports(), max_latency,
1246                                                      ((_direction == Output) ? "PLAYBACK" : "CAPTURE")));
1247         return max_latency;
1248 }
1249
1250 int
1251 IO::connect_ports_to_bundle (boost::shared_ptr<Bundle> c, bool exclusive, void* src)
1252 {
1253         BLOCK_PROCESS_CALLBACK ();
1254
1255         {
1256                 Glib::Threads::Mutex::Lock lm2 (io_lock);
1257
1258                 if (exclusive) {
1259                         for (PortSet::iterator i = _ports.begin(); i != _ports.end(); ++i) {
1260                                 i->disconnect_all ();
1261                         }
1262                 }
1263
1264                 c->connect (_bundle, _session.engine());
1265
1266                 /* If this is a UserBundle, make a note of what we've done */
1267
1268                 boost::shared_ptr<UserBundle> ub = boost::dynamic_pointer_cast<UserBundle> (c);
1269                 if (ub) {
1270
1271                         /* See if we already know about this one */
1272                         std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin();
1273                         while (i != _bundles_connected.end() && (*i)->bundle != ub) {
1274                                 ++i;
1275                         }
1276
1277                         if (i == _bundles_connected.end()) {
1278                                 /* We don't, so make a note */
1279                                 _bundles_connected.push_back (new UserBundleInfo (this, ub));
1280                         }
1281                 }
1282         }
1283
1284         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
1285         return 0;
1286 }
1287
1288 int
1289 IO::disconnect_ports_from_bundle (boost::shared_ptr<Bundle> c, void* src)
1290 {
1291         BLOCK_PROCESS_CALLBACK ();
1292
1293         {
1294                 Glib::Threads::Mutex::Lock lm2 (io_lock);
1295
1296                 c->disconnect (_bundle, _session.engine());
1297
1298                 /* If this is a UserBundle, make a note of what we've done */
1299
1300                 boost::shared_ptr<UserBundle> ub = boost::dynamic_pointer_cast<UserBundle> (c);
1301                 if (ub) {
1302
1303                         std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin();
1304                         while (i != _bundles_connected.end() && (*i)->bundle != ub) {
1305                                 ++i;
1306                         }
1307
1308                         if (i != _bundles_connected.end()) {
1309                                 delete *i;
1310                                 _bundles_connected.erase (i);
1311                         }
1312                 }
1313         }
1314
1315         changed (IOChange (IOChange::ConnectionsChanged), src); /* EMIT SIGNAL */
1316         return 0;
1317 }
1318
1319
1320 int
1321 IO::disable_connecting ()
1322 {
1323         connecting_legal = false;
1324         return 0;
1325 }
1326
1327 int
1328 IO::enable_connecting ()
1329 {
1330         Glib::Threads::Mutex::Lock lm (AudioEngine::instance()->process_lock());
1331         connecting_legal = true;
1332         boost::optional<int> r = ConnectingLegal ();
1333         return r.get_value_or (0);
1334 }
1335
1336 void
1337 IO::bundle_changed (Bundle::Change /*c*/)
1338 {
1339         /* XXX */
1340 //      connect_input_ports_to_bundle (_input_bundle, this);
1341 }
1342
1343
1344 string
1345 IO::build_legal_port_name (DataType type)
1346 {
1347         const int name_size = AudioEngine::instance()->port_name_size();
1348         int limit;
1349         string suffix;
1350
1351         if (type == DataType::AUDIO) {
1352                 suffix = X_("audio");
1353         } else if (type == DataType::MIDI) {
1354                 suffix = X_("midi");
1355         } else {
1356                 throw unknown_type();
1357         }
1358
1359         /* note that if "in" or "out" are translated it will break a session
1360            across locale switches because a port's connection list will
1361            show (old) translated names, but the current port name will
1362            use the (new) translated name.
1363         */
1364
1365         if (_sendish) {
1366                 if (_direction == Input) {
1367                         suffix += X_("_return");
1368                 } else {
1369                         suffix += X_("_send");
1370                 }
1371         } else {
1372                 if (_direction == Input) {
1373                         suffix += X_("_in");
1374                 } else {
1375                         suffix += X_("_out");
1376                 }
1377         }
1378
1379         // allow up to 4 digits for the output port number, plus the slash, suffix and extra space
1380
1381         limit = name_size - AudioEngine::instance()->my_name().length() - (suffix.length() + 5);
1382
1383         std::vector<char> buf1(name_size+1);
1384         std::vector<char> buf2(name_size+1);
1385
1386         /* colons are illegal in port names, so fix that */
1387
1388         string nom = _name.val();
1389         replace_all (nom, ":", ";");
1390
1391         snprintf (&buf1[0], name_size+1, ("%.*s/%s"), limit, nom.c_str(), suffix.c_str());
1392
1393         int port_number = find_port_hole (&buf1[0]);
1394         snprintf (&buf2[0], name_size+1, "%s %d", &buf1[0], port_number);
1395
1396         return string (&buf2[0]);
1397 }
1398
1399 int32_t
1400 IO::find_port_hole (const char* base)
1401 {
1402         /* CALLER MUST HOLD IO LOCK */
1403
1404         uint32_t n;
1405
1406         if (_ports.empty()) {
1407                 return 1;
1408         }
1409
1410         /* we only allow up to 4 characters for the port number
1411          */
1412
1413         for (n = 1; n < 9999; ++n) {
1414                 std::vector<char> buf (AudioEngine::instance()->port_name_size());
1415                 PortSet::iterator i = _ports.begin();
1416
1417                 snprintf (&buf[0], buf.size()+1, _("%s %u"), base, n);
1418
1419                 for ( ; i != _ports.end(); ++i) {
1420                         if (string(i->name()) == string(&buf[0])) {
1421                                 break;
1422                         }
1423                 }
1424
1425                 if (i == _ports.end()) {
1426                         break;
1427                 }
1428         }
1429         return n;
1430 }
1431
1432
1433 boost::shared_ptr<AudioPort>
1434 IO::audio(uint32_t n) const
1435 {
1436         return _ports.nth_audio_port (n);
1437
1438 }
1439
1440 boost::shared_ptr<MidiPort>
1441 IO::midi(uint32_t n) const
1442 {
1443         return _ports.nth_midi_port (n);
1444 }
1445
1446 /**
1447  *  Setup a bundle that describe our inputs or outputs. Also creates the bundle if necessary.
1448  */
1449
1450 void
1451 IO::setup_bundle ()
1452 {
1453         char buf[32];
1454
1455         if (!_bundle) {
1456                 _bundle.reset (new Bundle (_direction == Input));
1457         }
1458
1459         _bundle->suspend_signals ();
1460
1461         _bundle->remove_channels ();
1462
1463         if (_direction == Input) {
1464                 snprintf(buf, sizeof (buf), _("%s in"), _name.val().c_str());
1465         } else {
1466                 snprintf(buf, sizeof (buf), _("%s out"), _name.val().c_str());
1467         }
1468         _bundle->set_name (buf);
1469
1470         int c = 0;
1471         for (DataType::iterator i = DataType::begin(); i != DataType::end(); ++i) {
1472
1473                 uint32_t const N = _ports.count().get (*i);
1474                 for (uint32_t j = 0; j < N; ++j) {
1475                         _bundle->add_channel (bundle_channel_name (j, N, *i), *i);
1476                         _bundle->set_port (c, _session.engine().make_port_name_non_relative (_ports.port(*i, j)->name()));
1477                         ++c;
1478                 }
1479
1480         }
1481
1482         _bundle->resume_signals ();
1483 }
1484
1485 /** @return Bundles connected to our ports */
1486 BundleList
1487 IO::bundles_connected ()
1488 {
1489         BundleList bundles;
1490
1491         /* User bundles */
1492         for (std::vector<UserBundleInfo*>::iterator i = _bundles_connected.begin(); i != _bundles_connected.end(); ++i) {
1493                 bundles.push_back ((*i)->bundle);
1494         }
1495
1496         /* Session bundles */
1497         boost::shared_ptr<ARDOUR::BundleList> b = _session.bundles ();
1498         for (ARDOUR::BundleList::iterator i = b->begin(); i != b->end(); ++i) {
1499                 if ((*i)->connected_to (_bundle, _session.engine())) {
1500                         bundles.push_back (*i);
1501                 }
1502         }
1503
1504         /* Route bundles */
1505
1506         boost::shared_ptr<ARDOUR::RouteList> r = _session.get_routes ();
1507
1508         if (_direction == Input) {
1509                 for (ARDOUR::RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1510                         if ((*i)->output()->bundle()->connected_to (_bundle, _session.engine())) {
1511                                 bundles.push_back ((*i)->output()->bundle());
1512                         }
1513                 }
1514         } else {
1515                 for (ARDOUR::RouteList::iterator i = r->begin(); i != r->end(); ++i) {
1516                         if ((*i)->input()->bundle()->connected_to (_bundle, _session.engine())) {
1517                                 bundles.push_back ((*i)->input()->bundle());
1518                         }
1519                 }
1520         }
1521
1522         return bundles;
1523 }
1524
1525
1526 IO::UserBundleInfo::UserBundleInfo (IO* io, boost::shared_ptr<UserBundle> b)
1527 {
1528         bundle = b;
1529         b->Changed.connect_same_thread (changed, boost::bind (&IO::bundle_changed, io, _1));
1530 }
1531
1532 std::string
1533 IO::bundle_channel_name (uint32_t c, uint32_t n, DataType t) const
1534 {
1535         char buf[32];
1536
1537         if (t == DataType::AUDIO) {
1538
1539                 switch (n) {
1540                 case 1:
1541                         return _("mono");
1542                 case 2:
1543                         return c == 0 ? _("L") : _("R");
1544                 default:
1545                         snprintf (buf, sizeof(buf), _("%d"), (c + 1));
1546                         return buf;
1547                 }
1548
1549         } else {
1550
1551                 snprintf (buf, sizeof(buf), _("%d"), (c + 1));
1552                 return buf;
1553
1554         }
1555
1556         return "";
1557 }
1558
1559 string
1560 IO::name_from_state (const XMLNode& node)
1561 {
1562         const XMLProperty* prop;
1563
1564         if ((prop = node.property ("name")) != 0) {
1565                 return prop->value();
1566         }
1567
1568         return string();
1569 }
1570
1571 void
1572 IO::set_name_in_state (XMLNode& node, const string& new_name)
1573 {
1574         node.add_property (X_("name"), new_name);
1575         XMLNodeList children = node.children ();
1576         for (XMLNodeIterator i = children.begin(); i != children.end(); ++i) {
1577                 if ((*i)->name() == X_("Port")) {
1578                         string const old_name = (*i)->property(X_("name"))->value();
1579                         string const old_name_second_part = old_name.substr (old_name.find_first_of ("/") + 1);
1580                         (*i)->add_property (X_("name"), string_compose ("%1/%2", new_name, old_name_second_part));
1581                 }
1582         }
1583 }
1584
1585 bool
1586 IO::connected () const
1587 {
1588         /* do we have any connections at all? */
1589
1590         for (PortSet::const_iterator p = _ports.begin(); p != _ports.end(); ++p) {
1591                 if (p->connected()) {
1592                         return true;
1593                 }
1594         }
1595
1596         return false;
1597 }
1598
1599 bool
1600 IO::connected_to (boost::shared_ptr<const IO> other) const
1601 {
1602         if (!other) {
1603                 return connected ();
1604         }
1605
1606         assert (_direction != other->direction());
1607
1608         uint32_t i, j;
1609         uint32_t no = n_ports().n_total();
1610         uint32_t ni = other->n_ports ().n_total();
1611
1612         for (i = 0; i < no; ++i) {
1613                 for (j = 0; j < ni; ++j) {
1614                         if (nth(i)->connected_to (other->nth(j)->name())) {
1615                                 return true;
1616                         }
1617                 }
1618         }
1619
1620         return false;
1621 }
1622
1623 bool
1624 IO::connected_to (const string& str) const
1625 {
1626         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1627                 if (i->connected_to (str)) {
1628                         return true;
1629                 }
1630         }
1631
1632         return false;
1633 }
1634
1635 /** Call a processor's ::run() method, giving it our buffers
1636  *  Caller must hold process lock.
1637  */
1638 void
1639 IO::process_input (boost::shared_ptr<Processor> proc, framepos_t start_frame, framepos_t end_frame, pframes_t nframes)
1640 {
1641         /* don't read the data into new buffers - just use the port buffers directly */
1642
1643         if (n_ports().n_total() == 0) {
1644                 /* We have no ports, so nothing to process */
1645                 return;
1646         }
1647
1648         _buffers.get_backend_port_addresses (_ports, nframes);
1649         if (proc) {
1650                 proc->run (_buffers, start_frame, end_frame, nframes, true);
1651         }
1652 }
1653
1654 void
1655 IO::collect_input (BufferSet& bufs, pframes_t nframes, ChanCount offset)
1656 {
1657         assert(bufs.available() >= _ports.count());
1658
1659         if (_ports.count() == ChanCount::ZERO) {
1660                 return;
1661         }
1662
1663         bufs.set_count (_ports.count());
1664
1665         for (DataType::iterator t = DataType::begin(); t != DataType::end(); ++t) {
1666                 PortSet::iterator   i = _ports.begin(*t);
1667                 BufferSet::iterator b = bufs.begin(*t);
1668
1669                 for (uint32_t off = 0; off < offset.get(*t); ++off, ++b) {
1670                         if (b == bufs.end(*t)) {
1671                                 continue;
1672                         }
1673                 }
1674
1675                 for ( ; i != _ports.end(*t); ++i, ++b) {
1676                         Buffer& bb (i->get_buffer (nframes));
1677                         b->read_from (bb, nframes);
1678                 }
1679         }
1680 }
1681
1682 void
1683 IO::copy_to_outputs (BufferSet& bufs, DataType type, pframes_t nframes, framecnt_t offset)
1684 {
1685         // Copy any buffers 1:1 to outputs
1686
1687         PortSet::iterator o = _ports.begin(type);
1688         BufferSet::iterator i = bufs.begin(type);
1689         BufferSet::iterator prev = i;
1690
1691         while (i != bufs.end(type) && o != _ports.end (type)) {
1692                 Buffer& port_buffer (o->get_buffer (nframes));
1693                 port_buffer.read_from (*i, nframes, offset);
1694                 prev = i;
1695                 ++i;
1696                 ++o;
1697         }
1698
1699         // Copy last buffer to any extra outputs
1700
1701         while (o != _ports.end(type)) {
1702                 Buffer& port_buffer (o->get_buffer (nframes));
1703                 port_buffer.read_from (*prev, nframes, offset);
1704                 ++o;
1705         }
1706 }
1707
1708 boost::shared_ptr<Port>
1709 IO::port_by_name (const std::string& str) const
1710 {
1711         /* to be called only from ::set_state() - no locking */
1712
1713         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1714
1715                 if (i->name() == str) {
1716                         return boost::const_pointer_cast<Port> (*i);
1717                 }
1718         }
1719
1720         return boost::shared_ptr<Port> ();
1721 }
1722
1723 bool
1724 IO::physically_connected () const
1725 {
1726         for (PortSet::const_iterator i = _ports.begin(); i != _ports.end(); ++i) {
1727                 if (i->physically_connected()) {
1728                         return true;
1729                 }
1730         }
1731
1732         return false;
1733 }
1734
1735 bool
1736 IO::has_port (boost::shared_ptr<Port> p) const
1737 {
1738         Glib::Threads::Mutex::Lock lm (io_lock);
1739         return _ports.contains (p);
1740 }