2 * Copyright (C) 2017 Paul Davis <paul@linuxaudiosystems.com>
3 * Copyright (C) 2019 Robin Gareus <robin@gareus.org>
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.
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.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #ifndef __ardour_note_fixer_h__
21 #define __ardour_note_fixer_h__
25 #include <boost/utility.hpp>
27 #include "temporal/beats.h"
29 #include "evoral/Note.hpp"
31 #include "ardour/midi_model.h"
32 #include "ardour/types.h"
34 namespace Evoral { template<typename Time> class EventSink; }
38 class BeatsSamplesConverter;
39 class MidiStateTracker;
42 /** A tracker and compensator for note edit operations.
44 * This monitors edit operations sent to a model that affect active notes
45 * during a read, and maintains a queue of synthetic events that should be sent
46 * at the start of the next read to maintain coherent MIDI state.
48 class NoteFixer : public boost::noncopyable
51 typedef Evoral::Note<Temporal::Beats> Note;
55 /** Clear all internal state. */
58 /** Handle a region edit during read.
60 * This must be called before the command is applied to the model. Events
61 * are enqueued to compensate for edits which should be later sent with
62 * emit() at the start of the next read.
64 * @param tempo_map The tempo-map
65 * @param cmd Command to compensate for.
66 * @param origin Timeline position of edited source.
67 * @param pos Current read position (last read end).
68 * @param active_notes currently active notes (read/write)
70 void prepare(TempoMap& tempo_map,
71 const MidiModel::NoteDiffCommand* cmd,
74 std::set< boost::weak_ptr<Note> >& active_notes);
76 /** Emit any pending edit compensation events.
78 * @param dst Destination for events.
79 * @param pos Timestamp to be used for every event, should be the start of
80 * the read block immediately following any calls to prepare().
81 * @param tracker Tracker to update with emitted events.
83 void emit(Evoral::EventSink<samplepos_t>& dst,
85 MidiStateTracker& tracker);
88 typedef Evoral::Event<samplepos_t> Event;
89 typedef std::list<Event*> Events;
91 /** Copy a beats event to a samples event with the given time stamp. */
92 Event* copy_event(samplepos_t time, const Evoral::Event<Temporal::Beats>& ev);
94 /** Return true iff `note` is active at `pos`. */
95 bool note_is_active(const BeatsSamplesConverter& converter,
96 boost::shared_ptr<Note> note,
102 } /* namespace ARDOUR */
104 #endif /* __ardour_note_fixer_h__ */