channel.h

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/*
 * Copyright (C) 1998-2017 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2006-2009 David Robillard <d@drobilla.net>
 * Copyright (C) 2010 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 <queue>
#include <map>
 
#include "pbd/signals.h"
#include "midi++/parser.h"
 
namespace MIDI {
 
class Port;
 
class LIBMIDIPP_API Channel : public PBD::ScopedConnectionList {
 
  public:
        Channel (byte channel_number, Port &);
 
        Port &midi_port()           { return _port; }
        byte channel()                  { return _channel_number; }
        byte program()                  { return _program_number; }
        unsigned short bank()           { return _bank_number; }
        byte pressure ()                { return _chanpress; }
        byte poly_pressure (byte n)     { return _polypress[n]; }
 
        byte last_note_on () {
                return _last_note_on;
        }
        byte last_on_velocity () {
                return _last_on_velocity;
        }
        byte last_note_off () {
                return _last_note_off;
        }
        byte last_off_velocity () {
                return _last_off_velocity;
        }
 
        pitchbend_t pitchbend () {
                return _pitch_bend;
        }
 
        controller_value_t controller_value (byte n) {
                return _controller_val[n%128];
        }
 
        controller_value_t *controller_addr (byte n) {
                return &_controller_val[n%128];
        }
 
        void set_controller (byte n, byte val) {
                _controller_val[n%128] = val;
        }
 
        controller_value_t rpn_value (uint16_t rpn_id);
        controller_value_t nrpn_value (uint16_t rpn_id);
 
        bool channel_msg (byte id, byte val1, byte val2, timestamp_t timestamp);
        bool all_notes_off (timestamp_t timestamp) {
                return channel_msg (MIDI::controller, 123, 0, timestamp);
        }
 
        bool control (byte id, byte value, timestamp_t timestamp) {
                return channel_msg (MIDI::controller, id, value, timestamp);
        }
 
        bool note_on (byte note, byte velocity, timestamp_t timestamp) {
                return channel_msg (MIDI::on, note, velocity, timestamp);
        }
 
        bool note_off (byte note, byte velocity, timestamp_t timestamp) {
                return channel_msg (MIDI::off, note, velocity, timestamp);
        }
 
        bool aftertouch (byte value, timestamp_t timestamp) {
                return channel_msg (MIDI::chanpress, value, 0, timestamp);
        }
 
        bool poly_aftertouch (byte note, byte value, timestamp_t timestamp) {
                return channel_msg (MIDI::polypress, note, value, timestamp);
        }
 
        bool program_change (byte value, timestamp_t timestamp) {
                return channel_msg (MIDI::program, value, 0, timestamp);
        }
 
        bool pitchbend (byte msb, byte lsb, timestamp_t timestamp) {
                return channel_msg (MIDI::pitchbend, lsb, msb, timestamp);
        }
 
        float rpn_value (uint16_t rpn) const;
        float nrpn_value (uint16_t nrpn) const;
        float rpn_value_absolute (uint16_t rpn) const;
        float nrpn_value_absolute (uint16_t nrpn) const;
 
  protected:
        friend class Port;
        void connect_signals ();
 
  private:
        Port& _port;
 
        enum RPNState {
                HaveLSB = 0x1,
                HaveMSB = 0x2,
                HaveValue = 0x4
        };
 
        /* Current channel values */
        byte               _channel_number;
        unsigned short     _bank_number;
        byte               _program_number;
        byte               _rpn_msb;
        byte               _rpn_lsb;
        byte               _rpn_val_msb;
        byte               _rpn_val_lsb;
        byte               _nrpn_msb;
        byte               _nrpn_lsb;
        byte               _nrpn_val_lsb;
        byte               _nrpn_val_msb;
        RPNState           _rpn_state;
        RPNState           _nrpn_state;
        byte               _chanpress;
        byte               _polypress[128];
        bool               _controller_14bit[128];
        controller_value_t _controller_val[128];
        byte               _controller_msb[128];
        byte               _controller_lsb[128];
        byte               _last_note_on;
        byte               _last_on_velocity;
        byte               _last_note_off;
        byte               _last_off_velocity;
        pitchbend_t        _pitch_bend;
        bool               _omni;
        bool               _poly;
        bool               _mono;
        size_t             _notes_on;
 
        typedef std::map<uint16_t,float> RPNList;
 
        RPNList rpns;
        RPNList nrpns;
 
        void reset (timestamp_t timestamp, samplecnt_t nframes, bool notes_off = true);
 
        void process_note_off (Parser &, EventTwoBytes *);
        void process_note_on (Parser &, EventTwoBytes *);
        void process_controller (Parser &, EventTwoBytes *);
        void process_polypress (Parser &, EventTwoBytes *);
        void process_program_change (Parser &, byte);
        void process_chanpress (Parser &, byte);
        void process_pitchbend (Parser &, pitchbend_t);
        void process_reset (Parser &);
        bool maybe_process_rpns (Parser&, EventTwoBytes *);
 
        void rpn_reset ();
        void nrpn_reset ();
 
        static const RPNState RPN_READY_FOR_VALUE;
        static const RPNState RPN_VALUE_READY;
 
};
 
} // namespace MIDI