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