Add a Raw MIDI parser (based on ALSA raw MIDI)
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libs/ardour/ardour/raw_midi_parser.h
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89
libs/ardour/ardour/raw_midi_parser.h
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/*
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* Copyright (C) 2014,2017 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2010 Devin Anderson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _ardour_raw_midi_parser_h_
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#define _ardour_raw_midi_parser_h_
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#include "ardour/libardour_visibility.h"
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#include "ardour/types.h"
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namespace ARDOUR {
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class LIBARDOUR_API RawMidiParser
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{
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public:
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RawMidiParser ();
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void reset () {
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_event_size = 0;
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_unbuffered_bytes = 0;
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_total_bytes = 0;
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_expected_bytes = 0;
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_status_byte = 0;
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}
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uint8_t const * midi_buffer () const { return _parser_buffer; }
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size_t buffer_size () const { return _event_size; }
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/** parse a MIDI byte
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* @return true if message is complete, false if more data is needed
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*/
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bool process_byte (const uint8_t byte);
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private:
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void record_byte (uint8_t byte) {
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if (_total_bytes < sizeof (_parser_buffer)) {
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_parser_buffer[_total_bytes] = byte;
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} else {
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++_unbuffered_bytes;
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}
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++_total_bytes;
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}
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void prepare_byte_event (const uint8_t byte) {
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_parser_buffer[0] = byte;
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_event_size = 1;
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}
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bool prepare_buffered_event () {
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const bool result = _unbuffered_bytes == 0;
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if (result) {
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_event_size = _total_bytes;
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}
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_total_bytes = 0;
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_unbuffered_bytes = 0;
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if (_status_byte >= 0xf0) {
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_expected_bytes = 0;
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_status_byte = 0;
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}
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return result;
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}
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size_t _event_size;
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size_t _unbuffered_bytes;
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size_t _total_bytes;
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size_t _expected_bytes;
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uint8_t _status_byte;
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uint8_t _parser_buffer[1024];
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};
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} // namespace ARDOUR
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#endif /* _ardour_raw_midi_parser_h_ */
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libs/ardour/raw_midi_parser.cc
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118
libs/ardour/raw_midi_parser.cc
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/*
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* Copyright (C) 2014,2017 Robin Gareus <robin@gareus.org>
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* Copyright (C) 2010 Devin Anderson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "ardour/raw_midi_parser.h"
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using namespace ARDOUR;
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RawMidiParser::RawMidiParser ()
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{
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reset ();
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}
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/* based on AlsaRawMidiIn, some code-dup */
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bool
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RawMidiParser::process_byte (const uint8_t byte)
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{
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if (byte >= 0xf8) {
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// Realtime
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if (byte == 0xfd) {
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return false;
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}
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prepare_byte_event (byte);
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return true;
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}
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if (byte == 0xf7) {
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// Sysex end
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if (_status_byte == 0xf0) {
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record_byte (byte);
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return prepare_buffered_event ();
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}
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_total_bytes = 0;
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_unbuffered_bytes = 0;
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_expected_bytes = 0;
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_status_byte = 0;
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return false;
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}
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if (byte >= 0x80) {
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// Non-realtime status byte
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if (_total_bytes) {
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_total_bytes = 0;
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_unbuffered_bytes = 0;
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}
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_status_byte = byte;
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switch (byte & 0xf0) {
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case 0x80:
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case 0x90:
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case 0xa0:
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case 0xb0:
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case 0xe0:
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// Note On, Note Off, Aftertouch, Control Change, Pitch Wheel
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_expected_bytes = 3;
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break;
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case 0xc0:
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case 0xd0:
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// Program Change, Channel Pressure
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_expected_bytes = 2;
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break;
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case 0xf0:
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switch (byte) {
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case 0xf0:
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// Sysex
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_expected_bytes = 0;
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break;
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case 0xf1:
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case 0xf3:
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// MTC Quarter Frame, Song Select
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_expected_bytes = 2;
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break;
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case 0xf2:
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// Song Position
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_expected_bytes = 3;
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break;
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case 0xf4:
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case 0xf5:
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// Undefined
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_expected_bytes = 0;
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_status_byte = 0;
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return false;
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case 0xf6:
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// Tune Request
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prepare_byte_event (byte);
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_expected_bytes = 0;
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_status_byte = 0;
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return true;
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}
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}
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record_byte (byte);
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return false;
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}
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// Data byte
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if (!_status_byte) {
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// Data bytes without a status will be discarded.
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_total_bytes++;
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_unbuffered_bytes++;
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return false;
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}
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if (!_total_bytes) {
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record_byte (_status_byte);
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}
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record_byte (byte);
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return (_total_bytes == _expected_bytes) ? prepare_buffered_event () : false;
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}
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@ -180,6 +180,7 @@ libardour_sources = [
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'quantize.cc',
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'rc_configuration.cc',
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'readonly_control.cc',
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'raw_midi_parser.cc',
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'recent_sessions.cc',
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'record_enable_control.cc',
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'record_safe_control.cc',
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