raw_midi_parser.h

Go to the documentation of this file.

/*
 * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
 *
 * 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.
 */
 
#ifndef _ardour_raw_midi_parser_h_
#define _ardour_raw_midi_parser_h_
 
#include "ardour/libardour_visibility.h"
#include "ardour/types.h"
 
namespace ARDOUR {
 
class LIBARDOUR_API RawMidiParser
{
public:
        RawMidiParser ();
 
        void reset () {
                _event_size = 0;
                _unbuffered_bytes = 0;
                _total_bytes = 0;
                _expected_bytes = 0;
                _status_byte = 0;
        }
 
        uint8_t const * midi_buffer () const { return  _parser_buffer; }
        size_t buffer_size () const { return _event_size; }
 
        bool process_byte (const uint8_t byte);
 
private:
 
        void record_byte (uint8_t byte) {
                if (_total_bytes < sizeof (_parser_buffer)) {
                        _parser_buffer[_total_bytes] = byte;
                } else {
                        ++_unbuffered_bytes;
                }
                ++_total_bytes;
        }
 
        void prepare_byte_event (const uint8_t byte) {
                _parser_buffer[0] = byte;
                _event_size = 1;
        }
 
        bool prepare_buffered_event () {
                const bool result = _unbuffered_bytes == 0;
                if (result) {
                        _event_size = _total_bytes;
                }
                _total_bytes = 0;
                _unbuffered_bytes = 0;
                if (_status_byte >= 0xf0) {
                        _expected_bytes = 0;
                        _status_byte = 0;
                }
                return result;
        }
 
        size_t  _event_size;
        size_t  _unbuffered_bytes;
        size_t  _total_bytes;
        size_t  _expected_bytes;
        uint8_t _status_byte;
        uint8_t _parser_buffer[1024];
};
 
} // namespace ARDOUR
 
#endif /* _ardour_raw_midi_parser_h_ */