change note colors on the fly, to permit user-definition of colors more easily; remov...
[ardour.git] / libs / ardour / midi_model.cc
index 2b6353353712dbbf1f8dbbb25932d18f42e41c84..57cbb70cfdd587831b69773d99e0e05bd9f64d6d 100644 (file)
@@ -19,7 +19,7 @@
 */
 
 #define __STDC_LIMIT_MACROS 1
-
+#include <set>
 #include <iostream>
 #include <algorithm>
 #include <stdexcept>
@@ -30,6 +30,7 @@
 
 #include "ardour/midi_model.h"
 #include "ardour/midi_source.h"
+#include "ardour/midi_state_tracker.h"
 #include "ardour/smf_source.h"
 #include "ardour/types.h"
 #include "ardour/session.h"
@@ -38,25 +39,12 @@ using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-MidiModel::MidiModel(MidiSource* s, size_t size)
-       : AutomatableSequence<TimeType>(s->session(), size)
+MidiModel::MidiModel(MidiSource* s)
+       : AutomatableSequence<TimeType>(s->session())
        , _midi_source(s)
 {
 }
 
-/** Start a new Delta command.
- *
- * This has no side-effects on the model or Session, the returned command
- * can be held on to for as long as the caller wishes, or discarded without
- * formality, until apply_command is called and ownership is taken.
- */
-MidiModel::DeltaCommand*
-MidiModel::new_delta_command(const string name)
-{
-       DeltaCommand* cmd = new DeltaCommand(_midi_source->model(), name);
-       return cmd;
-}
-
 /** Start a new Diff command.
  *
  * This has no side-effects on the model or Session, the returned command
@@ -97,10 +85,15 @@ MidiModel::apply_command_as_subcommand(Session& session, Command* cmd)
        set_edited(true);
 }
 
+/************** DIFF COMMAND ********************/
 
-// DeltaCommand
+#define DIFF_COMMAND_ELEMENT "DiffCommand"
+#define DIFF_NOTES_ELEMENT "ChangedNotes"
+#define ADDED_NOTES_ELEMENT "AddedNotes"
+#define REMOVED_NOTES_ELEMENT "RemovedNotes"
+#define SIDE_EFFECT_REMOVALS_ELEMENT "SideEffectRemovals"
 
-MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const std::string& name)
+MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const std::string& name)
        : Command(name)
        , _model(m)
        , _name(name)
@@ -108,7 +101,7 @@ MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const std:
        assert(_model);
 }
 
-MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const XMLNode& node)
+MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const XMLNode& node)
        : _model(m)
 {
        assert(_model);
@@ -116,617 +109,1007 @@ MidiModel::DeltaCommand::DeltaCommand(boost::shared_ptr<MidiModel> m, const XMLN
 }
 
 void
-MidiModel::DeltaCommand::add(const boost::shared_ptr< Evoral::Note<TimeType> > note)
+MidiModel::DiffCommand::add(const NotePtr note)
 {
        _removed_notes.remove(note);
        _added_notes.push_back(note);
 }
 
 void
-MidiModel::DeltaCommand::remove(const boost::shared_ptr< Evoral::Note<TimeType> > note)
+MidiModel::DiffCommand::remove(const NotePtr note)
 {
        _added_notes.remove(note);
        _removed_notes.push_back(note);
 }
 
 void
-MidiModel::DeltaCommand::operator()()
+MidiModel::DiffCommand::side_effect_remove(const NotePtr note)
 {
-       // This could be made much faster by using a priority_queue for added and
-       // removed notes (or sort here), and doing a single iteration over _model
-
-       MidiModel::WriteLock lock(_model->write_lock());
-
-       for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
-               _model->add_note_unlocked(*i);
-       }
-
-       for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
-               _model->remove_note_unlocked(*i);
-       }
-
-       lock.reset();
-       _model->ContentsChanged(); /* EMIT SIGNAL */
+       side_effect_removals.insert (note);
 }
 
-void
-MidiModel::DeltaCommand::undo()
-{
-       // This could be made much faster by using a priority_queue for added and
-       // removed notes (or sort here), and doing a single iteration over _model
-
-       MidiModel::WriteLock lock(_model->write_lock());;
-
-       for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
-               _model->remove_note_unlocked(*i);
-       }
-
-       for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
-               _model->add_note_unlocked(*i);
-       }
-
-       lock.reset();
-       _model->ContentsChanged(); /* EMIT SIGNAL */
-}
-
-XMLNode&
-MidiModel::DeltaCommand::marshal_note(const boost::shared_ptr< Evoral::Note<TimeType> > note)
-{
-       XMLNode* xml_note = new XMLNode("note");
-       ostringstream note_str(ios::ate);
-       note_str << int(note->note());
-       xml_note->add_property("note", note_str.str());
-
-       ostringstream channel_str(ios::ate);
-       channel_str << int(note->channel());
-       xml_note->add_property("channel", channel_str.str());
+ void
+ MidiModel::DiffCommand::change(const NotePtr note, Property prop,
+                                uint8_t new_value)
+ {
+         NoteChange change;
+
+         switch (prop) {
+         case NoteNumber:
+                 if (new_value == note->note()) {
+                         return;
+                 }
+                 change.old_value = note->note();
+                 break;
+         case Velocity:
+                 if (new_value == note->velocity()) {
+                         return;
+                 }
+                 change.old_value = note->velocity();
+                 break;
+         case Channel:
+                 if (new_value == note->channel()) {
+                         return;
+                 }
+                 change.old_value = note->channel();
+                 break;
+
+
+         case StartTime:
+                 fatal << "MidiModel::DiffCommand::change() with integer argument called for start time" << endmsg;
+                 /*NOTREACHED*/
+                 break;
+         case Length:
+                 fatal << "MidiModel::DiffCommand::change() with integer argument called for length" << endmsg;
+                 /*NOTREACHED*/
+                 break;
+         }
+
+         change.note = note;
+         change.property = prop;
+         change.new_value = new_value;
+
+         _changes.push_back (change);
+ }
+
+ void
+ MidiModel::DiffCommand::change(const NotePtr note, Property prop,
+                                TimeType new_time)
+ {
+         NoteChange change;
+
+         switch (prop) {
+         case NoteNumber:
+         case Channel:
+         case Velocity:
+                 fatal << "MidiModel::DiffCommand::change() with time argument called for note, channel or velocity" << endmsg;
+                 break;
+
+         case StartTime:
+                 if (Evoral::musical_time_equal (note->time(), new_time)) {
+                         return;
+                 }
+                 change.old_time = note->time();
+                 break;
+         case Length:
+                 if (Evoral::musical_time_equal (note->length(), new_time)) {
+                         return;
+                 }
+                 change.old_time = note->length();
+                 break;
+         }
+
+         change.note = note;
+         change.property = prop;
+         change.new_time = new_time;
+
+         _changes.push_back (change);
+ }
+
+ MidiModel::DiffCommand&
+ MidiModel::DiffCommand::operator+= (const DiffCommand& other)
+ {
+         if (this == &other) {
+                 return *this;
+         }
+
+         if (_model != other._model) {
+                 return *this;
+         }
+
+         _added_notes.insert (_added_notes.end(), other._added_notes.begin(), other._added_notes.end());
+         _removed_notes.insert (_removed_notes.end(), other._removed_notes.begin(), other._removed_notes.end());
+         side_effect_removals.insert (other.side_effect_removals.begin(), other.side_effect_removals.end());
+         _changes.insert (_changes.end(), other._changes.begin(), other._changes.end());
+
+         return *this;
+ }
+
+ void
+ MidiModel::DiffCommand::operator()()
+ {
+         {
+                 MidiModel::WriteLock lock(_model->edit_lock());
+
+                 for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
+                         if (!_model->add_note_unlocked(*i)) {
+                                 /* failed to add it, so don't leave it in the removed list, to
+                                    avoid apparent errors on undo.
+                                  */
+                                 _removed_notes.remove (*i);
+                         }
+                 }
+
+                 for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
+                         _model->remove_note_unlocked(*i);
+                 }
+
+                 /* notes we modify in a way that requires remove-then-add to maintain ordering */
+                 set<NotePtr> temporary_removals;
+
+                 for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
+                         Property prop = i->property;
+                         switch (prop) {
+                         case NoteNumber:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+                                 }
+                                 i->note->set_note (i->new_value);
+                                 break;
+
+                         case StartTime:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+
+                                 }
+                                 i->note->set_time (i->new_time);
+                                 break;
+
+                         case Channel:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+                                 }
+                                 i->note->set_channel (i->new_value);
+                                 break;
+
+                         /* no remove-then-add required for these properties, since we do not index them
+                          */
+
+                         case Velocity:
+                                 i->note->set_velocity (i->new_value);
+                                 break;
+
+                         case Length:
+                                 i->note->set_length (i->new_time);
+                                 break;
+
+                         }
+                 }
+
+
+                 for (set<NotePtr>::iterator i = temporary_removals.begin(); i != temporary_removals.end(); ++i) {
+                         DiffCommand side_effects (model(), "side effects");
+                         _model->add_note_unlocked (*i, &side_effects);
+                         *this += side_effects;
+                 }
+
+                 if (!side_effect_removals.empty()) {
+                         cerr << "SER: \n";
+                         for (set<NotePtr>::iterator i = side_effect_removals.begin(); i != side_effect_removals.end(); ++i) {
+                                 cerr << "\t" << *i << ' ' << **i << endl;
+                         }
+                 }
+         }
+
+         _model->ContentsChanged(); /* EMIT SIGNAL */
+ }
+
+ void
+ MidiModel::DiffCommand::undo()
+ {
+         {
+                 MidiModel::WriteLock lock(_model->edit_lock());
+
+                 for (NoteList::iterator i = _added_notes.begin(); i != _added_notes.end(); ++i) {
+                         _model->remove_note_unlocked(*i);
+                 }
+
+                 for (NoteList::iterator i = _removed_notes.begin(); i != _removed_notes.end(); ++i) {
+                         _model->add_note_unlocked(*i);
+                 }
+
+                 /* notes we modify in a way that requires remove-then-add to maintain ordering */
+                 set<NotePtr> temporary_removals;
+
+                 for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
+                         Property prop = i->property;
+                         switch (prop) {
+                         case NoteNumber:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+                                 }
+                                 i->note->set_note (i->old_value);
+                                 break;
+                         case Velocity:
+                                 i->note->set_velocity (i->old_value);
+                                 break;
+                         case StartTime:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+                                 }
+                                 i->note->set_time (i->old_time);
+                                 break;
+                         case Length:
+                                 i->note->set_length (i->old_time);
+                                 break;
+                         case Channel:
+                                 if (temporary_removals.find (i->note) == temporary_removals.end()) {
+                                         _model->remove_note_unlocked (i->note);
+                                         temporary_removals.insert (i->note);
+                                 }
+                                 i->note->set_channel (i->old_value);
+                                 break;
+                         }
+                 }
+
+                 for (set<NotePtr>::iterator i = temporary_removals.begin(); i != temporary_removals.end(); ++i) {
+                         _model->add_note_unlocked (*i);
+                 }
+
+                 /* finally add back notes that were removed by the "do". we don't care
+                    about side effects here since the model should be back to its original
+                    state once this is done.
+                  */
+
+                 for (set<NotePtr>::iterator i = side_effect_removals.begin(); i != side_effect_removals.end(); ++i) {
+                         _model->add_note_unlocked (*i);
+                 }
+         }
+
+         _model->ContentsChanged(); /* EMIT SIGNAL */
+ }
+
+ XMLNode&
+ MidiModel::DiffCommand::marshal_note(const NotePtr note)
+ {
+         XMLNode* xml_note = new XMLNode("note");
+
+         cerr << "Marshalling note: " << *note << endl;
+
+         ostringstream note_str(ios::ate);
+         note_str << int(note->note());
+         xml_note->add_property("note", note_str.str());
+
+         ostringstream channel_str(ios::ate);
+         channel_str << int(note->channel());
+         xml_note->add_property("channel", channel_str.str());
+
+         ostringstream time_str(ios::ate);
+         time_str << note->time();
+         xml_note->add_property("time", time_str.str());
+
+         ostringstream length_str(ios::ate);
+         length_str << note->length();
+         xml_note->add_property("length", length_str.str());
+
+         ostringstream velocity_str(ios::ate);
+         velocity_str << (unsigned int) note->velocity();
+         xml_note->add_property("velocity", velocity_str.str());
+
+         return *xml_note;
+ }
+
+ Evoral::Sequence<MidiModel::TimeType>::NotePtr
+ MidiModel::DiffCommand::unmarshal_note(XMLNode *xml_note)
+ {
+         unsigned int note;
+         XMLProperty* prop;
+         unsigned int channel;
+         unsigned int time;
+         unsigned int length;
+         unsigned int velocity;
+
+         if ((prop = xml_note->property("note")) != 0) {
+                 istringstream note_str(prop->value());
+                 note_str >> note;
+         } else {
+                 warning << "note information missing note value" << endmsg;
+                 note = 127;
+         }
+
+         if ((prop = xml_note->property("channel")) != 0) {
+                 istringstream channel_str(prop->value());
+                 channel_str >> channel;
+         } else {
+                 warning << "note information missing channel" << endmsg;
+                 channel = 0;
+         }
+
+         if ((prop = xml_note->property("time")) != 0) {
+                 istringstream time_str(prop->value());
+                 time_str >> time;
+         } else {
+                 warning << "note information missing time" << endmsg;
+                 time = 0;
+         }
+
+         if ((prop = xml_note->property("length")) != 0) {
+                 istringstream length_str(prop->value());
+                 length_str >> length;
+         } else {
+                 warning << "note information missing length" << endmsg;
+                 length = 1;
+         }
+
+         if ((prop = xml_note->property("velocity")) != 0) {
+                 istringstream velocity_str(prop->value());
+                 velocity_str >> velocity;
+         } else {
+                 warning << "note information missing velocity" << endmsg;
+                 velocity = 127;
+         }
+
+         NotePtr note_ptr(new Evoral::Note<TimeType>(channel, time, length, note, velocity));
+
+         return note_ptr;
+ }
+
+ XMLNode&
+ MidiModel::DiffCommand::marshal_change(const NoteChange& change)
+ {
+         XMLNode* xml_change = new XMLNode("change");
+
+         /* first, the change itself */
+
+         xml_change->add_property ("property", enum_2_string (change.property));
+
+         {
+                 ostringstream old_value_str (ios::ate);
+                 if (change.property == StartTime || change.property == Length) {
+                         old_value_str << change.old_time;
+                 } else {
+                         old_value_str << (unsigned int) change.old_value;
+                 }
+                 xml_change->add_property ("old", old_value_str.str());
+         }
+
+         {
+                 ostringstream new_value_str (ios::ate);
+                 if (change.property == StartTime || change.property == Length) {
+                         new_value_str << change.new_time;
+                 } else {
+                         new_value_str << (unsigned int) change.new_value;
+                 }
+                 xml_change->add_property ("new", new_value_str.str());
+         }
+
+         /* now the rest of the note */
+
+         const SMFSource* smf = dynamic_cast<const SMFSource*> (_model->midi_source());
+
+         if (change.property != NoteNumber) {
+                 ostringstream note_str;
+                 note_str << int(change.note->note());
+                 xml_change->add_property("note", note_str.str());
+         }
+
+         if (change.property != Channel) {
+                 ostringstream channel_str;
+                 channel_str << int(change.note->channel());
+                 xml_change->add_property("channel", channel_str.str());
+         }
+
+         if (change.property != StartTime) {
+                 ostringstream time_str;
+                 if (smf) {
+                         time_str << smf->round_to_file_precision (change.note->time());
+                 } else {
+                         time_str << change.note->time();
+                 }
+                 xml_change->add_property("time", time_str.str());
+         }
+
+         if (change.property != Length) {
+                 ostringstream length_str;
+                 if (smf) {
+                         length_str << smf->round_to_file_precision (change.note->length());
+                 } else {
+                         length_str << change.note->length();
+                 }
+                 xml_change->add_property ("length", length_str.str());
+         }
+
+         if (change.property != Velocity) {
+                 ostringstream velocity_str;
+                 velocity_str << int (change.note->velocity());
+                 xml_change->add_property("velocity", velocity_str.str());
+         }
+
+         /* and now notes that were remove as a side-effect */
+
+         return *xml_change;
+ }
+
+ MidiModel::DiffCommand::NoteChange
+ MidiModel::DiffCommand::unmarshal_change(XMLNode *xml_change)
+ {
+         XMLProperty* prop;
+         NoteChange change;
+         unsigned int note;
+         unsigned int channel;
+         unsigned int velocity;
+         Evoral::MusicalTime time;
+         Evoral::MusicalTime length;
+
+         if ((prop = xml_change->property("property")) != 0) {
+                 change.property = (Property) string_2_enum (prop->value(), change.property);
+         } else {
+                 fatal << "!!!" << endmsg;
+                 /*NOTREACHED*/
+         }
+
+         if ((prop = xml_change->property ("old")) != 0) {
+                 istringstream old_str (prop->value());
+                 if (change.property == StartTime || change.property == Length) {
+                         old_str >> change.old_time;
+                 } else {
+                         int integer_value_so_that_istream_does_the_right_thing;
+                         old_str >> integer_value_so_that_istream_does_the_right_thing;
+                         change.old_value = integer_value_so_that_istream_does_the_right_thing;
+                 }
+         } else {
+                 fatal << "!!!" << endmsg;
+                 /*NOTREACHED*/
+         }
+
+         if ((prop = xml_change->property ("new")) != 0) {
+                 istringstream new_str (prop->value());
+                 if (change.property == StartTime || change.property == Length) {
+                         new_str >> change.new_time;
+                 } else {
+                         int integer_value_so_that_istream_does_the_right_thing;
+                         new_str >> integer_value_so_that_istream_does_the_right_thing;
+                         change.new_value = integer_value_so_that_istream_does_the_right_thing;
+                 }
+         } else {
+                 fatal << "!!!" << endmsg;
+                 /*NOTREACHED*/
+         }
+
+         if (change.property != NoteNumber) {
+                 if ((prop = xml_change->property("note")) != 0) {
+                         istringstream note_str(prop->value());
+                         note_str >> note;
+                 } else {
+                         warning << "note information missing note value" << endmsg;
+                         note = 127;
+                 }
+         } else {
+                 note = change.new_value;
+         }
+
+         if (change.property != Channel) {
+                 if ((prop = xml_change->property("channel")) != 0) {
+                         istringstream channel_str(prop->value());
+                         channel_str >> channel;
+                 } else {
+                         warning << "note information missing channel" << endmsg;
+                         channel = 0;
+                 }
+         } else {
+                 channel = change.new_value;
+         }
+
+         if (change.property != StartTime) {
+                 if ((prop = xml_change->property("time")) != 0) {
+                         istringstream time_str(prop->value());
+                         time_str >> time;
+                 } else {
+                         warning << "note information missing time" << endmsg;
+                         time = 0;
+                 }
+         } else {
+                 time = change.new_time;
+         }
+
+         if (change.property != Length) {
+                 if ((prop = xml_change->property("length")) != 0) {
+                         istringstream length_str(prop->value());
+                         length_str >> length;
+                 } else {
+                         warning << "note information missing length" << endmsg;
+                         length = 1;
+                 }
+         } else {
+                 length = change.new_time;
+         }
+
+         if (change.property != Velocity) {
+                 if ((prop = xml_change->property("velocity")) != 0) {
+                         istringstream velocity_str(prop->value());
+                         velocity_str >> velocity;
+                 } else {
+                         warning << "note information missing velocity" << endmsg;
+                         velocity = 127;
+                 }
+         } else {
+                 velocity = change.new_value;
+         }
+
+         /* we must point at the instance of the note that is actually in the model.
+            so go look for it ...
+         */
+
+         NotePtr new_note (new Evoral::Note<TimeType> (channel, time, length, note, velocity));
+
+         change.note = _model->find_note (new_note);
+
+         if (!change.note) {
+                 warning << "MIDI note " << *new_note << " not found in model - programmers should investigate this" << endmsg;
+                 /* use the actual new note */
+                 change.note = new_note;
+         }
+
+         return change;
+ }
+
+ int
+ MidiModel::DiffCommand::set_state(const XMLNode& diff_command, int /*version*/)
+ {
+         if (diff_command.name() != string(DIFF_COMMAND_ELEMENT)) {
+                 return 1;
+         }
+
+         /* additions */
+
+         _added_notes.clear();
+         XMLNode* added_notes = diff_command.child(ADDED_NOTES_ELEMENT);
+         if (added_notes) {
+                 XMLNodeList notes = added_notes->children();
+                 transform(notes.begin(), notes.end(), back_inserter(_added_notes),
+                           boost::bind (&DiffCommand::unmarshal_note, this, _1));
+         }
+
+
+         /* removals */
+
+         _removed_notes.clear();
+         XMLNode* removed_notes = diff_command.child(REMOVED_NOTES_ELEMENT);
+         if (removed_notes) {
+                 XMLNodeList notes = removed_notes->children();
+                 transform(notes.begin(), notes.end(), back_inserter(_removed_notes),
+                           boost::bind (&DiffCommand::unmarshal_note, this, _1));
+         }
+
+
+         /* changes */
+
+         _changes.clear();
+
+         XMLNode* changed_notes = diff_command.child(DIFF_NOTES_ELEMENT);
+
+         if (changed_notes) {
+                 XMLNodeList notes = changed_notes->children();
+                 transform (notes.begin(), notes.end(), back_inserter(_changes),
+                            boost::bind (&DiffCommand::unmarshal_change, this, _1));
+
+         }
+
+         /* side effect removals caused by changes */
+
+         side_effect_removals.clear();
+
+         XMLNode* side_effect_notes = diff_command.child(SIDE_EFFECT_REMOVALS_ELEMENT);
+
+         if (side_effect_notes) {
+                 XMLNodeList notes = side_effect_notes->children();
+                 for (XMLNodeList::iterator n = notes.begin(); n != notes.end(); ++n) {
+                         side_effect_removals.insert (unmarshal_note (*n));
+                 }
+         }
+
+         return 0;
+ }
+
+ XMLNode&
+ MidiModel::DiffCommand::get_state ()
+ {
+         XMLNode* diff_command = new XMLNode(DIFF_COMMAND_ELEMENT);
+         diff_command->add_property("midi-source", _model->midi_source()->id().to_s());
+
+         XMLNode* changes = diff_command->add_child(DIFF_NOTES_ELEMENT);
+         for_each(_changes.begin(), _changes.end(), 
+                  boost::bind (
+                          boost::bind (&XMLNode::add_child_nocopy, changes, _1),
+                          boost::bind (&DiffCommand::marshal_change, this, _1)));
+
+         XMLNode* added_notes = diff_command->add_child(ADDED_NOTES_ELEMENT);
+         for_each(_added_notes.begin(), _added_notes.end(), 
+                  boost::bind(
+                          boost::bind (&XMLNode::add_child_nocopy, added_notes, _1),
+                          boost::bind (&DiffCommand::marshal_note, this, _1)));
+
+         XMLNode* removed_notes = diff_command->add_child(REMOVED_NOTES_ELEMENT);
+         for_each(_removed_notes.begin(), _removed_notes.end(), 
+                  boost::bind (
+                          boost::bind (&XMLNode::add_child_nocopy, removed_notes, _1),
+                          boost::bind (&DiffCommand::marshal_note, this, _1)));
 
-       ostringstream time_str(ios::ate);
-       time_str << int(note->time());
-       xml_note->add_property("time", time_str.str());
+         /* if this command had side-effects, store that state too 
+          */
 
-       ostringstream length_str(ios::ate);
-       length_str <<(unsigned int) note->length();
-       xml_note->add_property("length", length_str.str());
-
-       ostringstream velocity_str(ios::ate);
-       velocity_str << (unsigned int) note->velocity();
-       xml_note->add_property("velocity", velocity_str.str());
-
-       return *xml_note;
-}
-
-boost::shared_ptr< Evoral::Note<MidiModel::TimeType> >
-MidiModel::DeltaCommand::unmarshal_note(XMLNode *xml_note)
-{
-       unsigned int note;
-       XMLProperty* prop;
-       unsigned int channel;
-       unsigned int time;
-       unsigned int length;
-       unsigned int velocity;
-
-       if ((prop = xml_note->property("note")) != 0) {
-               istringstream note_str(prop->value());
-               note_str >> note;
-       } else {
-               warning << "note information missing note value" << endmsg;
-               note = 127;
-       }
-
-       if ((prop = xml_note->property("channel")) != 0) {
-               istringstream channel_str(prop->value());
-               channel_str >> channel;
-       } else {
-               warning << "note information missing channel" << endmsg;
-               channel = 0;
-       }
-
-       if ((prop = xml_note->property("time")) != 0) {
-               istringstream time_str(prop->value());
-               time_str >> time;
-       } else {
-               warning << "note information missing time" << endmsg;
-               time = 0;
-       }
-
-       if ((prop = xml_note->property("length")) != 0) {
-               istringstream length_str(prop->value());
-               length_str >> length;
-       } else {
-               warning << "note information missing length" << endmsg;
-               length = 1;
-       }
-
-       if ((prop = xml_note->property("velocity")) != 0) {
-               istringstream velocity_str(prop->value());
-               velocity_str >> velocity;
-       } else {
-               warning << "note information missing velocity" << endmsg;
-               velocity = 127;
-       }
-
-       boost::shared_ptr< Evoral::Note<TimeType> > note_ptr(new Evoral::Note<TimeType>(
-                       channel, time, length, note, velocity));
-       return note_ptr;
-}
-
-#define ADDED_NOTES_ELEMENT "AddedNotes"
-#define REMOVED_NOTES_ELEMENT "RemovedNotes"
-#define DELTA_COMMAND_ELEMENT "DeltaCommand"
-
-int
-MidiModel::DeltaCommand::set_state (const XMLNode& delta_command, int /*version*/)
-{
-       if (delta_command.name() != string(DELTA_COMMAND_ELEMENT)) {
-               return 1;
-       }
-
-       _added_notes.clear();
-       XMLNode* added_notes = delta_command.child(ADDED_NOTES_ELEMENT);
-       if (added_notes) {
-               XMLNodeList notes = added_notes->children();
-               transform(notes.begin(), notes.end(), back_inserter(_added_notes),
-                         sigc::mem_fun(*this, &DeltaCommand::unmarshal_note));
-       }
-
-       _removed_notes.clear();
-       XMLNode* removed_notes = delta_command.child(REMOVED_NOTES_ELEMENT);
-       if (removed_notes) {
-               XMLNodeList notes = removed_notes->children();
-               transform(notes.begin(), notes.end(), back_inserter(_removed_notes),
-                         sigc::mem_fun(*this, &DeltaCommand::unmarshal_note));
-       }
-
-       return 0;
-}
-
-XMLNode&
-MidiModel::DeltaCommand::get_state()
-{
-       XMLNode* delta_command = new XMLNode(DELTA_COMMAND_ELEMENT);
-       delta_command->add_property("midi-source", _model->midi_source()->id().to_s());
-
-       XMLNode* added_notes = delta_command->add_child(ADDED_NOTES_ELEMENT);
-       for_each(_added_notes.begin(), _added_notes.end(), sigc::compose(
-                       sigc::mem_fun(*added_notes, &XMLNode::add_child_nocopy),
-                       sigc::mem_fun(*this, &DeltaCommand::marshal_note)));
-
-       XMLNode* removed_notes = delta_command->add_child(REMOVED_NOTES_ELEMENT);
-       for_each(_removed_notes.begin(), _removed_notes.end(), sigc::compose(
-                       sigc::mem_fun(*removed_notes, &XMLNode::add_child_nocopy),
-                       sigc::mem_fun(*this, &DeltaCommand::marshal_note)));
-
-       return *delta_command;
-}
-
-/************** DIFF COMMAND ********************/
-
-#define DIFF_NOTES_ELEMENT "ChangedNotes"
-#define DIFF_COMMAND_ELEMENT "DiffCommand"
-
-MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const std::string& name)
-       : Command(name)
-       , _model(m)
-       , _name(name)
-{
-       assert(_model);
+         if (!side_effect_removals.empty()) {
+                 XMLNode* side_effect_notes = diff_command->add_child(SIDE_EFFECT_REMOVALS_ELEMENT);
+                 for_each(side_effect_removals.begin(), side_effect_removals.end(), 
+                          boost::bind (
+                                  boost::bind (&XMLNode::add_child_nocopy, side_effect_notes, _1),
+                                  boost::bind (&DiffCommand::marshal_note, this, _1)));
+         }
+
+         return *diff_command;
+ }
+
+ /** Write all of the model to a MidiSource (i.e. save the model).
+  * This is different from manually using read to write to a source in that
+  * note off events are written regardless of the track mode.  This is so the
+  * user can switch a recorded track (with note durations from some instrument)
+  * to percussive, save, reload, then switch it back to sustained without
+  * destroying the original note durations.
+  */
+ bool
+ MidiModel::write_to (boost::shared_ptr<MidiSource> source)
+ {
+         ReadLock lock(read_lock());
+
+         const bool old_percussive = percussive();
+         set_percussive(false);
+
+         source->drop_model();
+         source->mark_streaming_midi_write_started(note_mode(), _midi_source->timeline_position());
+
+         for (Evoral::Sequence<TimeType>::const_iterator i = begin(); i != end(); ++i) {
+                 source->append_event_unlocked_beats(*i);
+         }
+
+         set_percussive(old_percussive);
+         source->mark_streaming_write_completed();
+
+         set_edited(false);
+
+         return true;
+ }
+
+ /** Write part or all of the model to a MidiSource (i.e. save the model).
+  * This is different from manually using read to write to a source in that
+  * note off events are written regardless of the track mode.  This is so the
+  * user can switch a recorded track (with note durations from some instrument)
+  * to percussive, save, reload, then switch it back to sustained without
+  * destroying the original note durations.
+  */
+ bool
+ MidiModel::write_section_to (boost::shared_ptr<MidiSource> source, Evoral::MusicalTime begin_time, Evoral::MusicalTime end_time)
+ {
+         ReadLock lock(read_lock());
+         MidiStateTracker mst;
+         Evoral::MusicalTime extra_note_on_time = end_time;
+
+         const bool old_percussive = percussive();
+         set_percussive(false);
+
+         source->drop_model();
+         source->mark_streaming_midi_write_started(note_mode(), _midi_source->timeline_position());
+
+         for (Evoral::Sequence<TimeType>::const_iterator i = begin(); i != end(); ++i) {
+                 const Evoral::Event<Evoral::MusicalTime>& ev (*i);
+
+                 if (ev.time() >= begin_time && ev.time() < end_time) {
+
+                         const Evoral::MIDIEvent<Evoral::MusicalTime>* mev = 
+                                 static_cast<const Evoral::MIDIEvent<Evoral::MusicalTime>* > (&ev);
+
+                         if (!mev) {
+                                 continue;
+                         }
+
+
+                         if (mev->is_note_off()) {
+
+                                 if (!mst.active (mev->note(), mev->channel())) {
+
+                                         /* add a note-on at the start of the range we're writing
+                                            to the file. velocity is just an arbitary reasonable value.
+                                         */
+
+                                         Evoral::MIDIEvent<Evoral::MusicalTime> on (mev->event_type(), extra_note_on_time, 3, 0, true);
+                                         on.set_type (mev->type());
+                                         on.set_note (mev->note());
+                                         on.set_channel (mev->channel());
+                                         on.set_velocity (mev->velocity());
+
+                                         cerr << "Add note on for odd note off, note = " << (int) on.note() << endl;
+                                         source->append_event_unlocked_beats (on);
+                                         mst.add (on.note(), on.channel());
+                                         mst.dump (cerr);
+                                         extra_note_on_time += 1.0/128.0;
+                                 }
+
+                                 cerr << "MIDI Note off (note = " << (int) mev->note() << endl;
+                                 source->append_event_unlocked_beats (*i);
+                                 mst.remove (mev->note(), mev->channel());
+                                 mst.dump (cerr);
+
+                         } else if (mev->is_note_on()) {
+                                 cerr << "MIDI Note on (note = " << (int) mev->note() << endl;
+                                 mst.add (mev->note(), mev->channel());
+                                 source->append_event_unlocked_beats(*i);
+                                 mst.dump (cerr);
+                         } else {
+                                 cerr << "MIDI other event type\n";
+                                 source->append_event_unlocked_beats(*i);
+                         }
+                 }
+         }
+
+         mst.resolve_notes (*source, end_time);
+
+         set_percussive(old_percussive);
+         source->mark_streaming_write_completed();
+
+         set_edited(false);
+
+         return true;
+ }
+
+ XMLNode&
+ MidiModel::get_state()
+ {
+         XMLNode *node = new XMLNode("MidiModel");
+         return *node;
+ }
+
+ Evoral::Sequence<MidiModel::TimeType>::NotePtr
+ MidiModel::find_note (NotePtr other)
+ {
+         Notes::iterator l = notes().lower_bound(other);
+
+         if (l != notes().end()) {
+                 for (; (*l)->time() == other->time(); ++l) {
+                         /* NB: compare note contents, not note pointers.
+                            If "other" was a ptr to a note already in
+                            the model, we wouldn't be looking for it,
+                            would we now?
+                          */
+                         if (**l == *other) {
+                                 return *l;
+                         }
+                 }
+         }
+
+         return NotePtr();
+ }
+
+ /** Lock and invalidate the source.
+  * This should be used by commands and editing things
+  */
+ MidiModel::WriteLock
+ MidiModel::edit_lock()
+ {
+         Glib::Mutex::Lock* source_lock = new Glib::Mutex::Lock(_midi_source->mutex());
+         _midi_source->invalidate(); // Release cached iterator's read lock on model
+         return WriteLock(new WriteLockImpl(source_lock, _lock, _control_lock));
+ }
+
+ /** Lock just the model, the source lock must already be held.
+  * This should only be called from libardour/evoral places
+  */
+ MidiModel::WriteLock
+ MidiModel::write_lock()
+ {
+         assert(!_midi_source->mutex().trylock());
+         return WriteLock(new WriteLockImpl(NULL, _lock, _control_lock));
+ }
+
+ int
+ MidiModel::resolve_overlaps_unlocked (const NotePtr note, void* arg)
+ {
+         using namespace Evoral;
+
+         if (_writing || insert_merge_policy() == InsertMergeRelax) {
+                 return 0;
+         }
+
+         DiffCommand* cmd = static_cast<DiffCommand*>(arg);
+
+         TimeType sa = note->time();
+         TimeType ea  = note->end_time();
+
+         const Pitches& p (pitches (note->channel()));
+         NotePtr search_note(new Note<TimeType>(0, 0, 0, note->note()));
+         set<NotePtr> to_be_deleted;
+         bool set_note_length = false;
+         bool set_note_time = false;
+         TimeType note_time = note->time();
+         TimeType note_length = note->length();
+
+         for (Pitches::const_iterator i = p.lower_bound (search_note); 
+              i != p.end() && (*i)->note() == note->note(); ++i) {
+
+                 TimeType sb = (*i)->time();
+                 TimeType eb = (*i)->end_time();
+                 OverlapType overlap = OverlapNone;
+
+                 if ((sb > sa) && (eb <= ea)) {
+                         overlap = OverlapInternal;
+                 } else if ((eb >= sa) && (eb <= ea)) {
+                         overlap = OverlapStart;
+                 } else if ((sb > sa) && (sb <= ea)) {
+                         overlap = OverlapEnd;
+                 } else if ((sa >= sb) && (sa <= eb) && (ea <= eb)) {
+                         overlap = OverlapExternal;
+                 } else {
+                         /* no overlap */
+                         continue;
+                 }
+
+                 if (insert_merge_policy() == InsertMergeReject) {
+                         return -1;
+                 }
+
+                 switch (overlap) {
+                 case OverlapStart:
+                         cerr << "OverlapStart\n";
+                         /* existing note covers start of new note */
+                         switch (insert_merge_policy()) {
+                         case InsertMergeReplace:
+                                 to_be_deleted.insert (*i);
+                                 break;
+                         case InsertMergeTruncateExisting:
+                                 if (cmd) {
+                                         cmd->change (*i, DiffCommand::Length, (note->time() - (*i)->time()));
+                                 }
+                                 (*i)->set_length (note->time() - (*i)->time());
+                                 break;
+                         case InsertMergeTruncateAddition:
+                                 set_note_time = true;
+                                 set_note_length = true;
+                                 note_time = (*i)->time() + (*i)->length();
+                                 note_length = min (note_length, (*i)->length() - ((*i)->end_time() - note->time()));
+                                 break;
+                         case InsertMergeExtend:
+                                 if (cmd) {
+                                         cmd->change ((*i), DiffCommand::Length, note->end_time() - (*i)->time());
+                                 } 
+                                 (*i)->set_length (note->end_time() - (*i)->time());
+                                 return -1; /* do not add the new note */
+                                 break;
+                         default:
+                                 /*NOTREACHED*/
+                                 /* stupid gcc */
+                                 break;
+                         }
+                         break;
+
+                 case OverlapEnd:
+                         cerr << "OverlapEnd\n";
+                         /* existing note covers end of new note */
+                         switch (insert_merge_policy()) {
+                         case InsertMergeReplace:
+                                 to_be_deleted.insert (*i);
+                                 break;
+
+                         case InsertMergeTruncateExisting:
+                                 /* resetting the start time of the existing note
+                                    is a problem because of time ordering.
+                                 */
+                                 break;
+
+                         case InsertMergeTruncateAddition:
+                                 set_note_length = true;
+                                 note_length = min (note_length, ((*i)->time() - note->time()));
+                                 break;
+
+                         case InsertMergeExtend:
+                                 /* we can't reset the time of the existing note because
+                                    that will corrupt time ordering. So remove the
+                                    existing note and change the position/length
+                                    of the new note (which has not been added yet)
+                                 */
+                                 to_be_deleted.insert (*i);
+                                 set_note_length = true;
+                                 note_length = min (note_length, (*i)->end_time() - note->time());
+                                 break;
+                         default:
+                                 /*NOTREACHED*/
+                                 /* stupid gcc */
+                                 break;
+                         }
+                         break;
+
+                 case OverlapExternal:
+                         cerr << "OverlapExt\n";
+                         /* existing note overlaps all the new note */
+                         switch (insert_merge_policy()) {
+                         case InsertMergeReplace:
+                                 to_be_deleted.insert (*i);
+                                 break;
+                         case InsertMergeTruncateExisting:
+                         case InsertMergeTruncateAddition:
+                         case InsertMergeExtend:
+                                 /* cannot add in this case */
+                                 return -1;
+                         default:
+                                 /*NOTREACHED*/
+                                 /* stupid gcc */
+                                 break;
+                         }
+                         break;
+
+                 case OverlapInternal:
+                         cerr << "OverlapInt\n";
+                         /* new note fully overlaps an existing note */
+                         switch (insert_merge_policy()) {
+                         case InsertMergeReplace:
+                         case InsertMergeTruncateExisting:
+                         case InsertMergeTruncateAddition:
+                         case InsertMergeExtend:
+                                 /* delete the existing note, the new one will cover it */
+                                 to_be_deleted.insert (*i);
+                                 break;
+                         default:
+                                 /*NOTREACHED*/
+                                 /* stupid gcc */
+                                 break;
+                         }
+                         break;
+
+                 default:
+                         /*NOTREACHED*/
+                         /* stupid gcc */
+                         break;
+                 }
+         }
+
+         for (set<NotePtr>::iterator i = to_be_deleted.begin(); i != to_be_deleted.end(); ++i) {
+                 remove_note_unlocked (*i);
+
+                 if (cmd) {
+                         cmd->side_effect_remove (*i);
+                 }
+         }
+
+         if (set_note_time) {
+                 if (cmd) {
+                         cmd->change (note, DiffCommand::StartTime, note_time);
+                 } 
+                 note->set_time (note_time);
+         }
+
+         if (set_note_length) {
+                 if (cmd) {
+                         cmd->change (note, DiffCommand::Length, note_length);
+                 } 
+                 note->set_length (note_length);
+         }
+
+         return 0;
+ }
+
+ InsertMergePolicy
+ MidiModel::insert_merge_policy () const 
+ {
+         /* XXX ultimately this should be a per-track or even per-model policy */
+
+         return _midi_source->session().config.get_insert_merge_policy();
 }
-
-MidiModel::DiffCommand::DiffCommand(boost::shared_ptr<MidiModel> m, const XMLNode& node)
-       : _model(m)
-{
-       assert(_model);
-       set_state(node, Stateful::loading_state_version);
-}
-
-void
-MidiModel::DiffCommand::change(const boost::shared_ptr< Evoral::Note<TimeType> > note, Property prop,
-                              uint8_t new_value)
-{
-       NotePropertyChange change;
-
-       change.note = note;
-       change.property = prop;
-       change.new_value = new_value;
-
-       switch (prop) {
-       case NoteNumber:
-               change.old_value = note->note();
-               break;
-       case Velocity:
-               change.old_value = note->velocity();
-               break;
-       case StartTime:
-               fatal << "MidiModel::DiffCommand::change() with integer argument called for start time" << endmsg;
-               /*NOTREACHED*/
-               break;
-       case Length:
-               fatal << "MidiModel::DiffCommand::change() with integer argument called for length" << endmsg;
-               /*NOTREACHED*/
-               break;
-       case Channel:
-               change.old_value = note->channel();
-               break;
-       }
-
-       _changes.push_back (change);
-}
-
-void
-MidiModel::DiffCommand::change(const boost::shared_ptr< Evoral::Note<TimeType> > note, Property prop,
-                              TimeType new_time)
-{
-       NotePropertyChange change;
-
-       change.note = note;
-       change.property = prop;
-       change.new_time = new_time;
-
-       switch (prop) {
-       case NoteNumber:
-       case Channel:
-       case Velocity:
-               fatal << "MidiModel::DiffCommand::change() with time argument called for note, channel or velocity" << endmsg;
-               break;
-       case StartTime:
-               change.old_time = note->time();
-               break;
-       case Length:
-               change.old_time = note->length();
-               break;
-       }
-
-       _changes.push_back (change);
-}
-
-void
-MidiModel::DiffCommand::operator()()
-{
-       MidiModel::WriteLock lock(_model->write_lock());
-
-       for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
-               Property prop = i->property;
-               switch (prop) {
-               case NoteNumber:
-                       i->note->set_note (i->new_value);
-                       break;
-               case Velocity:
-                       i->note->set_velocity (i->new_value);
-                       break;
-               case StartTime:
-                       i->note->set_time (i->new_time);
-                       break;
-               case Length:
-                       i->note->set_length (i->new_time);
-                       break;
-               case Channel:
-                       i->note->set_channel (i->new_value);
-                       break;
-               }
-       }
-
-       lock.reset();
-       _model->ContentsChanged(); /* EMIT SIGNAL */
-}
-
+                        
 void
-MidiModel::DiffCommand::undo()
-{
-       MidiModel::WriteLock lock(_model->write_lock());
-
-       for (ChangeList::iterator i = _changes.begin(); i != _changes.end(); ++i) {
-               Property prop = i->property;
-               switch (prop) {
-               case NoteNumber:
-                       i->note->set_note (i->old_value);
-                       break;
-               case Velocity:
-                       i->note->set_velocity (i->old_value);
-                       break;
-               case StartTime:
-                       i->note->set_time (i->old_time);
-                       break;
-               case Length:
-                       i->note->set_length (i->old_time);
-                       break;
-               case Channel:
-                       i->note->set_channel (i->old_value);
-                       break;
-               }
-       }
-
-       lock.reset();
-       _model->ContentsChanged(); /* EMIT SIGNAL */
-}
-
-XMLNode&
-MidiModel::DiffCommand::marshal_change(const NotePropertyChange& change)
-{
-       XMLNode* xml_change = new XMLNode("change");
-
-       /* first, the change itself */
-
-       xml_change->add_property ("property", enum_2_string (change.property));
-
-       {
-               ostringstream old_value_str (ios::ate);
-               if (change.property == StartTime || change.property == Length) {
-                       old_value_str << change.old_time;
-               } else {
-                       old_value_str << (unsigned int) change.old_value;
-               }
-               xml_change->add_property ("old", old_value_str.str());
-       }
-
-       {
-               ostringstream new_value_str (ios::ate);
-               if (change.property == StartTime || change.property == Length) {
-                       new_value_str << change.new_time;
-               } else {
-                       new_value_str << (unsigned int) change.new_value;
-               }
-               xml_change->add_property ("new", new_value_str.str());
-       }
-
-       /* now the rest of the note */
-
-       const SMFSource* smf = dynamic_cast<const SMFSource*> (_model->midi_source());
-
-       if (change.property != NoteNumber) {
-               ostringstream note_str;
-               note_str << int(change.note->note());
-               xml_change->add_property("note", note_str.str());
-       }
-
-       if (change.property != Channel) {
-               ostringstream channel_str;
-               channel_str << int(change.note->channel());
-               xml_change->add_property("channel", channel_str.str());
-       }
-
-       if (change.property != StartTime) {
-               ostringstream time_str;
-               if (smf) {
-                       time_str << smf->round_to_file_precision (change.note->time());
-               } else {
-                       time_str << change.note->time();
-               }
-               xml_change->add_property("time", time_str.str());
-       }
-
-       if (change.property != Length) {
-               ostringstream length_str;
-               if (smf) {
-                       length_str << smf->round_to_file_precision (change.note->length());
-               } else {
-                       length_str << change.note->length();
-               }
-               xml_change->add_property ("length", length_str.str());
-       }
-
-       if (change.property != Velocity) {
-               ostringstream velocity_str;
-               velocity_str << int (change.note->velocity());
-               xml_change->add_property("velocity", velocity_str.str());
-       }
-
-       return *xml_change;
-}
-
-MidiModel::DiffCommand::NotePropertyChange
-MidiModel::DiffCommand::unmarshal_change(XMLNode *xml_change)
-{
-       XMLProperty* prop;
-       NotePropertyChange change;
-       unsigned int note;
-       unsigned int channel;
-       unsigned int velocity;
-       Evoral::MusicalTime time;
-       Evoral::MusicalTime length;
-
-       if ((prop = xml_change->property("property")) != 0) {
-               change.property = (Property) string_2_enum (prop->value(), change.property);
-       } else {
-               fatal << "!!!" << endmsg;
-               /*NOTREACHED*/
-       }
-
-       if ((prop = xml_change->property ("old")) != 0) {
-               istringstream old_str (prop->value());
-               if (change.property == StartTime || change.property == Length) {
-                       old_str >> change.old_time;
-               } else {
-                       int integer_value_so_that_istream_does_the_right_thing;
-                       old_str >> integer_value_so_that_istream_does_the_right_thing;
-                       change.old_value = integer_value_so_that_istream_does_the_right_thing;
-               }
-       } else {
-               fatal << "!!!" << endmsg;
-               /*NOTREACHED*/
-       }
-
-       if ((prop = xml_change->property ("new")) != 0) {
-               istringstream new_str (prop->value());
-               if (change.property == StartTime || change.property == Length) {
-                       new_str >> change.new_time;
-               } else {
-                       int integer_value_so_that_istream_does_the_right_thing;
-                       new_str >> integer_value_so_that_istream_does_the_right_thing;
-                       change.new_value = integer_value_so_that_istream_does_the_right_thing;
-               }
-       } else {
-               fatal << "!!!" << endmsg;
-               /*NOTREACHED*/
-       }
-
-       if (change.property != NoteNumber) {
-               if ((prop = xml_change->property("note")) != 0) {
-                       istringstream note_str(prop->value());
-                       note_str >> note;
-               } else {
-                       warning << "note information missing note value" << endmsg;
-                       note = 127;
-               }
-       } else {
-               note = change.new_value;
-       }
-
-       if (change.property != Channel) {
-               if ((prop = xml_change->property("channel")) != 0) {
-                       istringstream channel_str(prop->value());
-                       channel_str >> channel;
-               } else {
-                       warning << "note information missing channel" << endmsg;
-                       channel = 0;
-               }
-       } else {
-               channel = change.new_value;
-       }
-
-       if (change.property != StartTime) {
-               if ((prop = xml_change->property("time")) != 0) {
-                       istringstream time_str(prop->value());
-                       time_str >> time;
-               } else {
-                       warning << "note information missing time" << endmsg;
-                       time = 0;
-               }
-       } else {
-               time = change.new_time;
-       }
-
-       if (change.property != Length) {
-               if ((prop = xml_change->property("length")) != 0) {
-                       istringstream length_str(prop->value());
-                       length_str >> length;
-               } else {
-                       warning << "note information missing length" << endmsg;
-                       length = 1;
-               }
-       } else {
-               length = change.new_time;
-       }
-
-       if (change.property != Velocity) {
-               if ((prop = xml_change->property("velocity")) != 0) {
-                       istringstream velocity_str(prop->value());
-                       velocity_str >> velocity;
-               } else {
-                       warning << "note information missing velocity" << endmsg;
-                       velocity = 127;
-               }
-       } else {
-               velocity = change.new_value;
-       }
-
-       /* we must point at the instance of the note that is actually in the model.
-          so go look for it ...
-       */
-
-       boost::shared_ptr<Evoral::Note<TimeType> > new_note (new Evoral::Note<TimeType> (channel, time, length, note, velocity));
-
-       change.note = _model->find_note (new_note);
-
-       if (!change.note) {
-               warning << "MIDI note " << *new_note << " not found in model - programmers should investigate this" << endmsg;
-               /* use the actual new note */
-               change.note = new_note;
-       }
-
-       return change;
-}
-
-int
-MidiModel::DiffCommand::set_state(const XMLNode& diff_command, int /*version*/)
-{
-       if (diff_command.name() != string(DIFF_COMMAND_ELEMENT)) {
-               return 1;
-       }
-
-       _changes.clear();
-
-       XMLNode* changed_notes = diff_command.child(DIFF_NOTES_ELEMENT);
-
-       if (changed_notes) {
-               XMLNodeList notes = changed_notes->children();
-
-               transform (notes.begin(), notes.end(), back_inserter(_changes),
-                          sigc::mem_fun(*this, &DiffCommand::unmarshal_change));
-       }
-
-       return 0;
-}
-
-XMLNode&
-MidiModel::DiffCommand::get_state ()
-{
-       XMLNode* diff_command = new XMLNode(DIFF_COMMAND_ELEMENT);
-       diff_command->add_property("midi-source", _model->midi_source()->id().to_s());
-
-       XMLNode* changes = diff_command->add_child(DIFF_NOTES_ELEMENT);
-       for_each(_changes.begin(), _changes.end(), sigc::compose(
-                        sigc::mem_fun(*changes, &XMLNode::add_child_nocopy),
-                        sigc::mem_fun(*this, &DiffCommand::marshal_change)));
-
-       return *diff_command;
-}
-
-/** Write the model to a MidiSource (i.e. save the model).
- * This is different from manually using read to write to a source in that
- * note off events are written regardless of the track mode.  This is so the
- * user can switch a recorded track (with note durations from some instrument)
- * to percussive, save, reload, then switch it back to sustained without
- * destroying the original note durations.
- */
-bool
-MidiModel::write_to(boost::shared_ptr<MidiSource> source)
-{
-       ReadLock lock(read_lock());
-
-       const bool old_percussive = percussive();
-       set_percussive(false);
-
-       source->drop_model();
-
-       for (Evoral::Sequence<TimeType>::const_iterator i = begin(); i != end(); ++i) {
-               source->append_event_unlocked_beats(*i);
-       }
-
-       set_percussive(old_percussive);
-
-       set_edited(false);
-
-       return true;
-}
-
-XMLNode&
-MidiModel::get_state()
-{
-       XMLNode *node = new XMLNode("MidiModel");
-       return *node;
-}
-
-boost::shared_ptr<Evoral::Note<MidiModel::TimeType> >
-MidiModel::find_note (boost::shared_ptr<Evoral::Note<TimeType> > other)
-{
-       Notes::iterator l = notes().lower_bound(other);
-
-       if (l != notes().end()) {
-               for (; (*l)->time() == other->time(); ++l) {
-                       if (*l == other) {
-                               return *l;
-                       }
-               }
-       }
-
-       return boost::shared_ptr<Evoral::Note<TimeType> >();
-}
-
-MidiModel::WriteLock
-MidiModel::write_lock()
+MidiModel::set_midi_source (MidiSource* s)
 {
-       Glib::Mutex::Lock* source_lock = new Glib::Mutex::Lock(_midi_source->mutex());
-       _midi_source->invalidate(); // Release cached iterator's read lock on model
-       return WriteLock(new WriteLockImpl(source_lock, _lock, _control_lock));
+       _midi_source->invalidate ();
+       _midi_source = s;
 }