midi_state_tracker.h

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/*
    Copyright (C) 2008 Paul Davis
    Author: Torben Hohn

    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_midi_state_tracker_h__
#define __ardour_midi_state_tracker_h__

#include <glibmm/threads.h>

#include "ardour/midi_buffer.h"

namespace Evoral {
template <typename T> class EventSink;
}

namespace ARDOUR {

class MidiSource;

class LIBARDOUR_API MidiStateTracker
{
public:
        MidiStateTracker();

        void track (const MidiBuffer::const_iterator& from, const MidiBuffer::const_iterator& to);
        void track (const uint8_t* evbuf);
        void add (uint8_t note, uint8_t chn);
        void remove (uint8_t note, uint8_t chn);
        void resolve_notes (MidiBuffer& buffer, framepos_t time);
        void resolve_notes (Evoral::EventSink<framepos_t>& buffer, framepos_t time);
        void resolve_notes (MidiSource& src, const Glib::Threads::Mutex::Lock& lock, Evoral::Beats time);
        void dump (std::ostream&);
        void reset ();
        bool empty() const { return _on == 0; }
        uint16_t on() const { return _on; }
        bool active (uint8_t note, uint8_t channel) {
                return _active_notes[(channel*128)+note] > 0;
        }

        template<typename Time>
        void track (const Evoral::Event<Time>& ev) {
                track (ev.buffer());
        }

private:
        uint8_t  _active_notes[128*16];
        uint16_t _on;
};


} // namespace ARDOUR

#endif // __ardour_midi_state_tracker_h__