118 lines
2.7 KiB
C++
118 lines
2.7 KiB
C++
/*
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* Copyright (C) 2017 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 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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