144 lines
3.6 KiB
C++
144 lines
3.6 KiB
C++
/*
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* Copyright (C) 2008-2014 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2014 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2009 Hans Baier <hansfbaier@googlemail.com>
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* Copyright (C) 2013 John Emmas <john@creativepost.co.uk>
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* Copyright (C) 2015-2016 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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#ifndef EVORAL_MIDI_UTIL_H
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#define EVORAL_MIDI_UTIL_H
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#include <iostream>
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#include <stdint.h>
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#include <string>
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#include <sys/types.h>
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#include <assert.h>
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#include "evoral/visibility.h"
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#include "evoral/midi_events.h"
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namespace Evoral {
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/** Return the size of the given event including the status byte,
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* or -1 if unknown (e.g. sysex)
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*/
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static inline int
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midi_event_size(uint8_t status)
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{
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// if we have a channel event
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if (status >= 0x80 && status < 0xF0) {
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status &= 0xF0; // mask off the channel
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}
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switch (status) {
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case MIDI_CMD_NOTE_OFF:
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case MIDI_CMD_NOTE_ON:
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case MIDI_CMD_NOTE_PRESSURE:
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case MIDI_CMD_CONTROL:
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case MIDI_CMD_BENDER:
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case MIDI_CMD_COMMON_SONG_POS:
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return 3;
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case MIDI_CMD_PGM_CHANGE:
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case MIDI_CMD_CHANNEL_PRESSURE:
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case MIDI_CMD_COMMON_MTC_QUARTER:
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case MIDI_CMD_COMMON_SONG_SELECT:
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return 2;
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case MIDI_CMD_COMMON_TUNE_REQUEST:
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case MIDI_CMD_COMMON_SYSEX_END:
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case MIDI_CMD_COMMON_CLOCK:
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case MIDI_CMD_COMMON_START:
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case MIDI_CMD_COMMON_CONTINUE:
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case MIDI_CMD_COMMON_STOP:
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case MIDI_CMD_COMMON_SENSING:
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case MIDI_CMD_COMMON_RESET:
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return 1;
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case MIDI_CMD_COMMON_SYSEX:
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std::cerr << "event size called for sysex\n";
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return -1;
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}
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std::cerr << "event size called for unknown status byte " << std::hex << (int) status << "\n";
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return -1;
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}
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/** Return the size of the given event including the status byte,
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* or -1 if event is illegal.
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*/
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static inline int
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midi_event_size(const uint8_t* buffer)
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{
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uint8_t status = buffer[0];
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// Mask off channel if applicable
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if (status >= 0x80 && status < 0xF0) {
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status &= 0xF0;
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}
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// see http://www.midi.org/techspecs/midimessages.php
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if (status == MIDI_CMD_COMMON_SYSEX) {
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int end;
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for (end = 1; buffer[end] != MIDI_CMD_COMMON_SYSEX_END; end++) {
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if ((buffer[end] & 0x80) != 0) {
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return -1;
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}
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}
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assert(buffer[end] == MIDI_CMD_COMMON_SYSEX_END);
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return end + 1;
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} else {
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return midi_event_size(status);
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}
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}
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/** Return true iff the given buffer is a valid MIDI event.
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* \a len must be exactly correct for the contents of \a buffer
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*/
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static inline bool
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midi_event_is_valid(const uint8_t* buffer, size_t len)
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{
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uint8_t status = buffer[0];
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if (status < 0x80) {
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return false;
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}
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const int size = midi_event_size(buffer);
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if (size < 0 || (size_t)size != len) {
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return false;
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}
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if (status < 0xf0) {
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/* Channel messages: all start with status byte followed by
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* non status bytes.
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*/
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for (size_t i = 1; i < len; ++i) {
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if ((buffer[i] & 0x80) != 0) {
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return false; // Non-status byte has MSb set
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}
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}
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}
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return true;
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}
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} // namespace Evoral
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#endif // EVORAL_MIDI_UTIL_H
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