midi_state_tracker.h

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/*
 * Copyright (C) 2008-2015 David Robillard <d@drobilla.net>
 * Copyright (C) 2009-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2010-2011 Carl Hetherington <carl@carlh.net>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <glibmm/threads.h>
 
#include "temporal/beats.h"
 
#include "ardour/debug.h"
#include "ardour/midi_buffer.h"
#include "ardour/source.h"
 
namespace Evoral {
template <typename T> class EventSink;
template <typename T> class EventList;
}
 
namespace ARDOUR {
 
class MidiSource;
 
class LIBARDOUR_API MidiNoteTracker
{
public:
        MidiNoteTracker();
        virtual ~MidiNoteTracker() {}
 
        virtual void track (const uint8_t* evbuf);
        virtual void dump (std::ostream&) const;
        virtual void reset ();
 
        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, samplepos_t time, bool reset = true);
        void resolve_notes (Evoral::EventSink<samplepos_t>& buffer, samplepos_t time);
        void resolve_notes (MidiSource& src, const Source::WriterLock& lock, Temporal::Beats time);
 
        void flush_notes (MidiBuffer& buffer, samplepos_t time, bool reset = true);
 
        template<typename Time>
        void flush_notes (Evoral::EventSink<Time> &sink, Time time, bool reset = true) {
                push_notes<Time> (sink, time, reset, MIDI_CMD_NOTE_ON, 64);
        }
 
        bool empty() const { return _on == 0; }
        uint16_t on() const { return _on; }
        bool active (uint8_t note, uint8_t channel) const {
                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;
 
        void push_notes (MidiBuffer &dst, samplepos_t time, bool reset, int cmd, int velocity);
 
        template<typename Time>
        void push_notes (Evoral::EventSink<Time> &dst, Time time, bool reset, int cmd, int velocity) {
                DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1 ES::push_notes @ %2 on = %3\n", this, time, _on));
 
                if (!_on) {
                        return;
                }
 
                for (int channel = 0; channel < 16; ++channel) {
                        const int coff = channel << 7;
                        for (int note = 0; note < 128; ++note) {
                                uint8_t cnt = _active_notes[note + coff];
                                while (cnt) {
                                        uint8_t buffer[3] = { ((uint8_t) (cmd | channel)), uint8_t (note), (uint8_t) velocity };
                                        /* note that we do not care about failure from
                                           write() ... should we warn someone ?
                                        */
                                        dst.write (time, Evoral::MIDI_EVENT, 3, buffer);
                                        cnt--;
                                        DEBUG_TRACE (PBD::DEBUG::MidiTrackers, string_compose ("%1: MB-push note %2/%3 at %4\n", this, (int) note, (int) channel, time));
                                }
                                if (reset) {
                                        _active_notes [note + coff] = 0;
                                }
                        }
                }
                if (reset) {
                        _on = 0;
                }
        }
};
 
class LIBARDOUR_API MidiStateTracker : public MidiNoteTracker
{
  public:
        MidiStateTracker ();
        ~MidiStateTracker() {}
 
        void track (const uint8_t* evbuf);
        void dump (std::ostream&) const;
        void reset ();
 
        void flush (MidiBuffer&, samplepos_t, bool reset);
        void resolve_state (Evoral::EventSink<samplepos_t>&, Evoral::EventList<samplepos_t> const&, samplepos_t time, bool reset = true);
        void resolve_diff (MidiStateTracker const& other, Evoral::EventSink<samplepos_t>&, samplepos_t time, bool reset = true);
 
  private:
        uint8_t  program[16];
        uint16_t bender[16];
        uint16_t pressure[16];
        uint8_t  control[16][127];
};
 
} // namespace ARDOUR