103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
/*
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Copyright (C) 2015 Paul Davis
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Author: David Robillard
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ardour_note_fixer_h__
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#define __ardour_note_fixer_h__
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#include <list>
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#include <boost/utility.hpp>
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#include "ardour/midi_model.h"
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#include "ardour/types.h"
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#include "temporal/beats.h"
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#include "evoral/Note.hpp"
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namespace Evoral { template<typename Time> class EventSink; }
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namespace ARDOUR {
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class BeatsSamplesConverter;
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class MidiStateTracker;
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class TempoMap;
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/** A tracker and compensator for note edit operations.
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*
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* This monitors edit operations sent to a model that affect active notes
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* during a read, and maintains a queue of synthetic events that should be sent
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* at the start of the next read to maintain coherent MIDI state.
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*/
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class NoteFixer : public boost::noncopyable
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{
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public:
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typedef Evoral::Note<Temporal::Beats> Note;
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~NoteFixer();
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/** Clear all internal state. */
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void clear();
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/** Handle a region edit during read.
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*
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* This must be called before the command is applied to the model. Events
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* are enqueued to compensate for edits which should be later sent with
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* emit() at the start of the next read.
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*
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* @param cmd Command to compensate for.
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* @param origin Timeline position of edited source.
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* @param pos Current read position (last read end).
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*/
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void prepare(TempoMap& tempo_map,
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const MidiModel::NoteDiffCommand* cmd,
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samplepos_t origin,
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samplepos_t pos,
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std::set< boost::weak_ptr<Note> >& active_notes);
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/** Emit any pending edit compensation events.
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*
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* @param dst Destination for events.
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* @param pos Timestamp to be used for every event, should be the start of
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* the read block immediately following any calls to prepare().
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* @param tracker Tracker to update with emitted events.
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*/
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void emit(Evoral::EventSink<samplepos_t>& dst,
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samplepos_t pos,
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MidiStateTracker& tracker);
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private:
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typedef Evoral::Event<samplepos_t> Event;
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typedef std::list<Event*> Events;
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/** Copy a beats event to a samples event with the given time stamp. */
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Event* copy_event(samplepos_t time, const Evoral::Event<Temporal::Beats>& ev);
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/** Return true iff `note` is active at `pos`. */
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bool note_is_active(const BeatsSamplesConverter& converter,
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boost::shared_ptr<Note> note,
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samplepos_t pos);
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Events _events;
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};
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} /* namespace ARDOUR */
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#endif /* __ardour_note_fixer_h__ */
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