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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 "ardour/midi_buffer.h"
namespace Evoral {
template <typename T> class EventSink;
}
namespace ARDOUR {
class MidiSource;
/** Tracks played notes, so they can be resolved in potential stuck note
* situations (e.g. looping, transport stop, etc).
*/
class LIBARDOUR_API MidiStateTracker
{
public:
MidiStateTracker();
void track (const MidiBuffer::const_iterator& from, const MidiBuffer::const_iterator& to);
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, Evoral::MusicalTime 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) {
const uint8_t type = ev.buffer()[0] & 0xF0;
const uint8_t chan = ev.buffer()[0] & 0x0F;
switch (type) {
case MIDI_CTL_ALL_NOTES_OFF:
reset();
break;
case MIDI_CMD_NOTE_ON:
add(ev.buffer()[1], chan);
break;
case MIDI_CMD_NOTE_OFF:
remove(ev.buffer()[1], chan);
break;
}
}
private:
uint8_t _active_notes[128*16];
uint16_t _on;
};
} // namespace ARDOUR
#endif // __ardour_midi_state_tracker_h__
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