libs/ardour/midi_model.cc

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3     Author: Dave Robillard
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #define __STDC_LIMIT_MACROS 1
  22
  23 #include <iostream>
  24 #include <algorithm>
  25 #include <stdexcept>
  26 #include <stdint.h>
  27 #include "pbd/error.h"
  28 #include "pbd/enumwriter.h"
  29 #include "midi++/events.h"
  30
  31 #include "ardour/midi_model.h"
  32 #include "ardour/midi_source.h"
  33 #include "ardour/smf_source.h"
  34 #include "ardour/types.h"
  35 #include "ardour/session.h"
  36
  37 using namespace std;
  38 using namespace ARDOUR;
  39 using namespace PBD;
  40
  41 MidiModel::MidiModel(MidiSource* s, size_t size)
  42         : AutomatableSequence<TimeType>(s->session(), size)
  43         , _midi_source(s)
  44 {
  45 }
  46
  47 /** Start a new Delta command.
  48  *
  49  * This has no side-effects on the model or Session, the returned command
  50  * can be held on to for as long as the caller wishes, or discarded without
  51  * formality, until apply_command is called and ownership is taken.
  52  */
  53 MidiModel::DeltaCommand*
  54 MidiModel::new_delta_command(const string name)
  55 {
  56         DeltaCommand* cmd = new DeltaCommand(_midi_source->model(), name);
  57         return cmd;
  58 }
  59
  60 /** Start a new Diff command.
  61  *
  62  * This has no side-effects on the model or Session, the returned command
  63  * can be held on to for as long as the caller wishes, or discarded without
  64  * formality, until apply_command is called and ownership is taken.
  65  */
  66 MidiModel::DiffCommand*
  67 MidiModel::new_diff_command(const string name)
  68 {
  69         DiffCommand* cmd = new DiffCommand(_midi_source->model(), name);
  70         return cmd;
  71 }
  72
  73 /** Apply a command.
  74  *
  75  * Ownership of cmd is taken, it must not be deleted by the caller.
  76  * The command will constitute one item on the undo stack.
  77  */
  78 void
  79 MidiModel::apply_command(Session& session, Command* cmd)
  80 {
  81         session.begin_reversible_command(cmd->name());
  82         (*cmd)();
  83         session.commit_reversible_command(cmd);
  84         set_edited(true);
  85 }
  86
  87 /** Apply a command as part of a larger reversible transaction
  88  *
  89  * Ownership of cmd is taken, it must not be deleted by the caller.
  90  * The command will constitute one item on the undo stack.
  91  */
  92 void
  93 MidiModel::apply_command_as_subcommand(Session& session, Command* cmd)
  94 {
  95         (*cmd)();
  96         session.add_command(cmd);
  97         set_edited(true);
  98 }
  99
 100
 101 // DeltaCommand
 102
 103 MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const std::string& name)
 104         : Command(name)
 105         , _model(m)
 106         , _name(name)
 107 {
 108         assert(_model);
 109 }
 110
 111 MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const XMLNode& node)
 112         : _model(m)
 113 {
 114         assert(_model);
 115         set_state(node);
 116 }
 117
 118 void
 119 MidiModel::DeltaCommand::add(const boost::shared_ptr< Evoral::Note<TimeType> > note)
 120 {
 121         _removed_notes.remove(note);
 122         _added_notes.push_back(note);
 123 }
 124
 125 void
 126 MidiModel::DeltaCommand::remove(const boost::shared_ptr< Evoral::Note<TimeType> > note)
 127 {
 128         _added_notes.remove(note);
 129         _removed_notes.push_back(note);
 130 }
 131
 132 void
 133 MidiModel::DeltaCommand::operator()()
 134 {
 135         // This could be made much faster by using a priority_queue for added and
 136         // removed notes (or sort here), and doing a single iteration over _model
 137
 138         Glib::Mutex::Lock lm (_model->_midi_source->mutex());
 139         _model->_midi_source->invalidate(); // release model read lock
 140         _model->write_lock();
 141
 142         for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
 143                 _model->add_note_unlocked(*i);
 144         }
 145
 146         for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
 147                 _model->remove_note_unlocked(*i);
 148         }
 149
 150         _model->write_unlock();
 151         _model->ContentsChanged(); /* EMIT SIGNAL */
 152 }
 153
 154 void
 155 MidiModel::DeltaCommand::undo()
 156 {
 157         // This could be made much faster by using a priority_queue for added and
 158         // removed notes (or sort here), and doing a single iteration over _model
 159
 160         Glib::Mutex::Lock lm (_model->_midi_source->mutex());
 161         _model->_midi_source->invalidate(); // release model read lock
 162         _model->write_lock();
 163
 164         for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
 165                 _model->remove_note_unlocked(*i);
 166         }
 167
 168         for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
 169                 _model->add_note_unlocked(*i);
 170         }
 171
 172         _model->write_unlock();
 173         _model->ContentsChanged(); /* EMIT SIGNAL */
 174 }
 175
 176 XMLNode&
 177 MidiModel::DeltaCommand::marshal_note(const boost::shared_ptr< Evoral::Note<TimeType> > note)
 178 {
 179         XMLNode* xml_note = new XMLNode("note");
 180         ostringstream note_str(ios::ate);
 181         note_str << int(note->note());
 182         xml_note->add_property("note", note_str.str());
 183
 184         ostringstream channel_str(ios::ate);
 185         channel_str << int(note->channel());
 186         xml_note->add_property("channel", channel_str.str());
 187
 188         ostringstream time_str(ios::ate);
 189         time_str << int(note->time());
 190         xml_note->add_property("time", time_str.str());
 191
 192         ostringstream length_str(ios::ate);
 193         length_str <<(unsigned int) note->length();
 194         xml_note->add_property("length", length_str.str());
 195
 196         ostringstream velocity_str(ios::ate);
 197         velocity_str << (unsigned int) note->velocity();
 198         xml_note->add_property("velocity", velocity_str.str());
 199
 200         return *xml_note;
 201 }
 202
 203 boost::shared_ptr< Evoral::Note<MidiModel::TimeType> >
 204 MidiModel::DeltaCommand::unmarshal_note(XMLNode *xml_note)
 205 {
 206         unsigned int note;
 207         XMLProperty* prop;
 208         unsigned int channel;
 209         unsigned int time;
 210         unsigned int length;
 211         unsigned int velocity;
 212
 213         if ((prop = xml_note->property("note")) != 0) {
 214                 istringstream note_str(prop->value());
 215                 note_str >> note;
 216         } else {
 217                 warning << "note information missing note value" << endmsg;
 218                 note = 127;
 219         }
 220
 221         if ((prop = xml_note->property("channel")) != 0) {
 222                 istringstream channel_str(prop->value());
 223                 channel_str >> channel;
 224         } else {
 225                 warning << "note information missing channel" << endmsg;
 226                 channel = 0;
 227         }
 228
 229         if ((prop = xml_note->property("time")) != 0) {
 230                 istringstream time_str(prop->value());
 231                 time_str >> time;
 232         } else {
 233                 warning << "note information missing time" << endmsg;
 234                 time = 0;
 235         }
 236
 237         if ((prop = xml_note->property("length")) != 0) {
 238                 istringstream length_str(prop->value());
 239                 length_str >> length;
 240         } else {
 241                 warning << "note information missing length" << endmsg;
 242                 length = 1;
 243         }
 244
 245         if ((prop = xml_note->property("velocity")) != 0) {
 246                 istringstream velocity_str(prop->value());
 247                 velocity_str >> velocity;
 248         } else {
 249                 warning << "note information missing velocity" << endmsg;
 250                 velocity = 127;
 251         }
 252
 253         boost::shared_ptr< Evoral::Note<TimeType> > note_ptr(new Evoral::Note<TimeType>(
 254                         channel, time, length, note, velocity));
 255         return note_ptr;
 256 }
 257
 258 #define ADDED_NOTES_ELEMENT "AddedNotes"
 259 #define REMOVED_NOTES_ELEMENT "RemovedNotes"
 260 #define DELTA_COMMAND_ELEMENT "DeltaCommand"
 261
 262 int
 263 MidiModel::DeltaCommand::set_state(const XMLNode& delta_command)
 264 {
 265         if (delta_command.name() != string(DELTA_COMMAND_ELEMENT)) {
 266                 return 1;
 267         }
 268
 269         _added_notes.clear();
 270         XMLNode* added_notes = delta_command.child(ADDED_NOTES_ELEMENT);
 271         if (added_notes) {
 272                 XMLNodeList notes = added_notes->children();
 273                 transform(notes.begin(), notes.end(), back_inserter(_added_notes),
 274                           sigc::mem_fun(*this, &DeltaCommand::unmarshal_note));
 275         }
 276
 277         _removed_notes.clear();
 278         XMLNode* removed_notes = delta_command.child(REMOVED_NOTES_ELEMENT);
 279         if (removed_notes) {
 280                 XMLNodeList notes = removed_notes->children();
 281                 transform(notes.begin(), notes.end(), back_inserter(_removed_notes),
 282                           sigc::mem_fun(*this, &DeltaCommand::unmarshal_note));
 283         }
 284
 285         return 0;
 286 }
 287
 288 XMLNode&
 289 MidiModel::DeltaCommand::get_state()
 290 {
 291         XMLNode* delta_command = new XMLNode(DELTA_COMMAND_ELEMENT);
 292         delta_command->add_property("midi-source", _model->midi_source()->id().to_s());
 293
 294         XMLNode* added_notes = delta_command->add_child(ADDED_NOTES_ELEMENT);
 295         for_each(_added_notes.begin(), _added_notes.end(), sigc::compose(
 296                         sigc::mem_fun(*added_notes, &XMLNode::add_child_nocopy),
 297                         sigc::mem_fun(*this, &DeltaCommand::marshal_note)));
 298
 299         XMLNode* removed_notes = delta_command->add_child(REMOVED_NOTES_ELEMENT);
 300         for_each(_removed_notes.begin(), _removed_notes.end(), sigc::compose(
 301                         sigc::mem_fun(*removed_notes, &XMLNode::add_child_nocopy),
 302                         sigc::mem_fun(*this, &DeltaCommand::marshal_note)));
 303
 304         return *delta_command;
 305 }
 306
 307 /************** DIFF COMMAND ********************/
 308
 309 #define DIFF_NOTES_ELEMENT "ChangedNotes"
 310 #define DIFF_COMMAND_ELEMENT "DiffCommand"
 311
 312 MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const std::string& name)
 313         : Command(name)
 314         , _model(m)
 315         , _name(name)
 316 {
 317         assert(_model);
 318 }
 319
 320 MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const XMLNode& node)
 321         : _model(m)
 322 {
 323         assert(_model);
 324         set_state(node);
 325 }
 326
 327 void
 328 MidiModel::DiffCommand::change(const boost::shared_ptr< Evoral::Note<TimeType> > note, Property prop,
 329                                uint8_t new_value)
 330 {
 331         NotePropertyChange change;
 332
 333         change.note = note;
 334         change.property = prop;
 335         change.new_value = new_value;
 336
 337         switch (prop) {
 338         case NoteNumber:
 339                 change.old_value = note->note();
 340                 break;
 341         case Velocity:
 342                 change.old_value = note->velocity();
 343                 break;
 344         case StartTime:
 345                 fatal << "MidiModel::DiffCommand::change() with integer argument called for start time" << endmsg;
 346                 /*NOTREACHED*/
 347                 break;
 348         case Length:
 349                 fatal << "MidiModel::DiffCommand::change() with integer argument called for length" << endmsg;
 350                 /*NOTREACHED*/
 351                 break;
 352         case Channel:
 353                 change.old_value = note->channel();
 354                 break;
 355         }
 356
 357         _changes.push_back (change);
 358 }
 359
 360 void
 361 MidiModel::DiffCommand::change(const boost::shared_ptr< Evoral::Note<TimeType> > note, Property prop,
 362                                TimeType new_time)
 363 {
 364         NotePropertyChange change;
 365
 366         change.note = note;
 367         change.property = prop;
 368         change.new_time = new_time;
 369
 370         switch (prop) {
 371         case NoteNumber:
 372         case Channel:
 373         case Velocity:
 374                 fatal << "MidiModel::DiffCommand::change() with time argument called for note, channel or velocity" << endmsg;
 375                 break;
 376         case StartTime:
 377                 change.old_time = note->time();
 378                 break;
 379         case Length:
 380                 change.old_time = note->length();
 381                 break;
 382         }
 383
 384         _changes.push_back (change);
 385 }
 386
 387 void
 388 MidiModel::DiffCommand::operator()()
 389 {
 390         Glib::Mutex::Lock lm (_model->_midi_source->mutex());
 391         _model->_midi_source->invalidate(); // release model read lock
 392         _model->write_lock();
 393
 394         for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
 395                 Property prop = i->property;
 396                 switch (prop) {
 397                 case NoteNumber:
 398                         i->note->set_note (i->new_value);
 399                         break;
 400                 case Velocity:
 401                         i->note->set_velocity (i->new_value);
 402                         break;
 403                 case StartTime:
 404                         i->note->set_time (i->new_time);
 405                         break;
 406                 case Length:
 407                         i->note->set_length (i->new_time);
 408                         break;
 409                 case Channel:
 410                         i->note->set_channel (i->new_value);
 411                         break;
 412                 }
 413         }
 414
 415         _model->write_unlock();
 416         _model->ContentsChanged(); /* EMIT SIGNAL */
 417 }
 418
 419 void
 420 MidiModel::DiffCommand::undo()
 421 {
 422         Glib::Mutex::Lock lm (_model->_midi_source->mutex());
 423         _model->_midi_source->invalidate(); // release model read lock
 424         _model->write_lock();
 425
 426         for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
 427                 Property prop = i->property;
 428                 switch (prop) {
 429                 case NoteNumber:
 430                         i->note->set_note (i->old_value);
 431                         break;
 432                 case Velocity:
 433                         i->note->set_velocity (i->old_value);
 434                         break;
 435                 case StartTime:
 436                         i->note->set_time (i->old_time);
 437                         break;
 438                 case Length:
 439                         i->note->set_length (i->old_time);
 440                         break;
 441                 case Channel:
 442                         i->note->set_channel (i->old_value);
 443                         break;
 444                 }
 445         }
 446
 447         _model->write_unlock();
 448         _model->ContentsChanged(); /* EMIT SIGNAL */
 449 }
 450
 451 XMLNode&
 452 MidiModel::DiffCommand::marshal_change(const NotePropertyChange& change)
 453 {
 454         XMLNode* xml_change = new XMLNode("change");
 455
 456         /* first, the change itself */
 457
 458         xml_change->add_property ("property", enum_2_string (change.property));
 459
 460         {
 461                 ostringstream old_value_str (ios::ate);
 462                 if (change.property == StartTime || change.property == Length) {
 463                         old_value_str << change.old_time;
 464                 } else {
 465                         old_value_str << (unsigned int) change.old_value;
 466                 }
 467                 xml_change->add_property ("old", old_value_str.str());
 468         }
 469
 470         {
 471                 ostringstream new_value_str (ios::ate);
 472                 if (change.property == StartTime || change.property == Length) {
 473                         new_value_str << change.new_time;
 474                 } else {
 475                         new_value_str << (unsigned int) change.new_value;
 476                 }
 477                 xml_change->add_property ("new", new_value_str.str());
 478         }
 479
 480         /* now the rest of the note */
 481
 482         const SMFSource* smf = dynamic_cast<const SMFSource*> (_model->midi_source());
 483
 484         if (change.property != NoteNumber) {
 485                 ostringstream note_str;
 486                 note_str << int(change.note->note());
 487                 xml_change->add_property("note", note_str.str());
 488         }
 489
 490         if (change.property != Channel) {
 491                 ostringstream channel_str;
 492                 channel_str << int(change.note->channel());
 493                 xml_change->add_property("channel", channel_str.str());
 494         }
 495
 496         if (change.property != StartTime) {
 497                 ostringstream time_str;
 498                 if (smf) {
 499                         time_str << smf->round_to_file_precision (change.note->time());
 500                 } else {
 501                         time_str << change.note->time();
 502                 }
 503                 xml_change->add_property("time", time_str.str());
 504         }
 505
 506         if (change.property != Length) {
 507                 ostringstream length_str;
 508                 if (smf) {
 509                         length_str << smf->round_to_file_precision (change.note->length());
 510                 } else {
 511                         length_str << change.note->length();
 512                 }
 513                 xml_change->add_property ("length", length_str.str());
 514         }
 515
 516         if (change.property != Velocity) {
 517                 ostringstream velocity_str;
 518                 velocity_str << int (change.note->velocity());
 519                 xml_change->add_property("velocity", velocity_str.str());
 520         }
 521
 522         return *xml_change;
 523 }
 524
 525 MidiModel::DiffCommand::NotePropertyChange
 526 MidiModel::DiffCommand::unmarshal_change(XMLNode *xml_change)
 527 {
 528         XMLProperty* prop;
 529         NotePropertyChange change;
 530         unsigned int note;
 531         unsigned int channel;
 532         unsigned int velocity;
 533         Evoral::MusicalTime time;
 534         Evoral::MusicalTime length;
 535
 536         if ((prop = xml_change->property("property")) != 0) {
 537                 change.property = (Property) string_2_enum (prop->value(), change.property);
 538         } else {
 539                 fatal << "!!!" << endmsg;
 540                 /*NOTREACHED*/
 541         }
 542
 543         if ((prop = xml_change->property ("old")) != 0) {
 544                 istringstream old_str (prop->value());
 545                 if (change.property == StartTime || change.property == Length) {
 546                         old_str >> change.old_time;
 547                 } else {
 548                         int integer_value_so_that_istream_does_the_right_thing;
 549                         old_str >> integer_value_so_that_istream_does_the_right_thing;
 550                         change.old_value = integer_value_so_that_istream_does_the_right_thing;
 551                 }
 552         } else {
 553                 fatal << "!!!" << endmsg;
 554                 /*NOTREACHED*/
 555         }
 556
 557         if ((prop = xml_change->property ("new")) != 0) {
 558                 istringstream new_str (prop->value());
 559                 if (change.property == StartTime || change.property == Length) {
 560                         new_str >> change.new_time;
 561                 } else {
 562                         int integer_value_so_that_istream_does_the_right_thing;
 563                         new_str >> integer_value_so_that_istream_does_the_right_thing;
 564                         change.new_value = integer_value_so_that_istream_does_the_right_thing;
 565                 }
 566         } else {
 567                 fatal << "!!!" << endmsg;
 568                 /*NOTREACHED*/
 569         }
 570
 571         if (change.property != NoteNumber) {
 572                 if ((prop = xml_change->property("note")) != 0) {
 573                         istringstream note_str(prop->value());
 574                         note_str >> note;
 575                 } else {
 576                         warning << "note information missing note value" << endmsg;
 577                         note = 127;
 578                 }
 579         } else {
 580                 note = change.new_value;
 581         }
 582
 583         if (change.property != Channel) {
 584                 if ((prop = xml_change->property("channel")) != 0) {
 585                         istringstream channel_str(prop->value());
 586                         channel_str >> channel;
 587                 } else {
 588                         warning << "note information missing channel" << endmsg;
 589                         channel = 0;
 590                 }
 591         } else {
 592                 channel = change.new_value;
 593         }
 594
 595         if (change.property != StartTime) {
 596                 if ((prop = xml_change->property("time")) != 0) {
 597                         istringstream time_str(prop->value());
 598                         time_str >> time;
 599                 } else {
 600                         warning << "note information missing time" << endmsg;
 601                         time = 0;
 602                 }
 603         } else {
 604                 time = change.new_time;
 605         }
 606
 607         if (change.property != Length) {
 608                 if ((prop = xml_change->property("length")) != 0) {
 609                         istringstream length_str(prop->value());
 610                         length_str >> length;
 611                 } else {
 612                         warning << "note information missing length" << endmsg;
 613                         length = 1;
 614                 }
 615         } else {
 616                 length = change.new_time;
 617         }
 618
 619         if (change.property != Velocity) {
 620                 if ((prop = xml_change->property("velocity")) != 0) {
 621                         istringstream velocity_str(prop->value());
 622                         velocity_str >> velocity;
 623                 } else {
 624                         warning << "note information missing velocity" << endmsg;
 625                         velocity = 127;
 626                 }
 627         } else {
 628                 velocity = change.new_value;
 629         }
 630
 631         /* we must point at the instance of the note that is actually in the model.
 632            so go look for it ...
 633         */
 634
 635         boost::shared_ptr<Evoral::Note<TimeType> > new_note (new Evoral::Note<TimeType> (channel, time, length, note, velocity));
 636
 637         change.note = _model->find_note (new_note);
 638
 639         if (!change.note) {
 640                 warning << "MIDI note " << *new_note << " not found in model - programmers should investigate this" << endmsg;
 641                 /* use the actual new note */
 642                 change.note = new_note;
 643         }
 644
 645         return change;
 646 }
 647
 648 int
 649 MidiModel::DiffCommand::set_state(const XMLNode& diff_command)
 650 {
 651         if (diff_command.name() != string(DIFF_COMMAND_ELEMENT)) {
 652                 return 1;
 653         }
 654
 655         _changes.clear();
 656
 657         XMLNode* changed_notes = diff_command.child(DIFF_NOTES_ELEMENT);
 658
 659         if (changed_notes) {
 660                 XMLNodeList notes = changed_notes->children();
 661
 662                 transform (notes.begin(), notes.end(), back_inserter(_changes),
 663                            sigc::mem_fun(*this, &DiffCommand::unmarshal_change));
 664         }
 665
 666         return 0;
 667 }
 668
 669 XMLNode&
 670 MidiModel::DiffCommand::get_state ()
 671 {
 672         XMLNode* diff_command = new XMLNode(DIFF_COMMAND_ELEMENT);
 673         diff_command->add_property("midi-source", _model->midi_source()->id().to_s());
 674
 675         XMLNode* changes = diff_command->add_child(DIFF_NOTES_ELEMENT);
 676         for_each(_changes.begin(), _changes.end(), sigc::compose(
 677                          sigc::mem_fun(*changes, &XMLNode::add_child_nocopy),
 678                          sigc::mem_fun(*this, &DiffCommand::marshal_change)));
 679
 680         return *diff_command;
 681 }
 682
 683 /** Write the model to a MidiSource (i.e. save the model).
 684  * This is different from manually using read to write to a source in that
 685  * note off events are written regardless of the track mode.  This is so the
 686  * user can switch a recorded track (with note durations from some instrument)
 687  * to percussive, save, reload, then switch it back to sustained without
 688  * destroying the original note durations.
 689  */
 690 bool
 691 MidiModel::write_to(boost::shared_ptr<MidiSource> source)
 692 {
 693         read_lock();
 694
 695         const bool old_percussive = percussive();
 696         set_percussive(false);
 697
 698         source->drop_model();
 699
 700         for (Evoral::Sequence<TimeType>::const_iterator i = begin(); i != end(); ++i) {
 701                 source->append_event_unlocked_beats(*i);
 702         }
 703
 704         set_percussive(old_percussive);
 705
 706         read_unlock();
 707         set_edited(false);
 708
 709         return true;
 710 }
 711
 712 XMLNode&
 713 MidiModel::get_state()
 714 {
 715         XMLNode *node = new XMLNode("MidiModel");
 716         return *node;
 717 }
 718
 719 boost::shared_ptr<Evoral::Note<MidiModel::TimeType> >
 720 MidiModel::find_note (boost::shared_ptr<Evoral::Note<TimeType> > other)
 721 {
 722         for (Notes::iterator x = notes().begin(); x != notes().end(); ++x) {
 723                 if (**x == *other) {
 724                         return *x;
 725                 }
 726
 727                 /* XXX optimize by using a stored iterator and break out
 728                    when passed start time.
 729                 */
 730         }
 731
 732         return boost::shared_ptr<Evoral::Note<TimeType> > ();
 733 }