/* This file is part of Evoral.
- * Copyright(C) 2008 Dave Robillard <http://drobilla.net>
+ * Copyright(C) 2008 David Robillard <http://drobilla.net>
* Copyright(C) 2000-2008 Paul Davis
- *
+ *
* Evoral 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.
- *
+ *
* Evoral 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef EVORAL_MIDI_UTIL_H
#define EVORAL_MIDI_UTIL_H
+#include <iostream>
+
+#include <stdint.h>
+#include <string>
+#include <sys/types.h>
+#include <assert.h>
+
+#include "evoral/visibility.h"
#include "evoral/midi_events.h"
namespace Evoral {
-/** Return the size of the given event NOT including the status byte,
- * or -1 if unknown (eg sysex)
+
+/** Return the size of the given event including the status byte,
+ * or -1 if unknown (e.g. sysex)
*/
static inline int
-midi_event_size(unsigned char status)
+midi_event_size(uint8_t status)
{
// if we have a channel event
if (status >= 0x80 && status < 0xF0) {
case MIDI_CMD_CONTROL:
case MIDI_CMD_BENDER:
case MIDI_CMD_COMMON_SONG_POS:
- return 2;
+ return 3;
case MIDI_CMD_PGM_CHANGE:
case MIDI_CMD_CHANNEL_PRESSURE:
case MIDI_CMD_COMMON_MTC_QUARTER:
case MIDI_CMD_COMMON_SONG_SELECT:
- return 1;
+ return 2;
case MIDI_CMD_COMMON_TUNE_REQUEST:
case MIDI_CMD_COMMON_SYSEX_END:
case MIDI_CMD_COMMON_STOP:
case MIDI_CMD_COMMON_SENSING:
case MIDI_CMD_COMMON_RESET:
- return 0;
-
+ return 1;
+
case MIDI_CMD_COMMON_SYSEX:
+ std::cerr << "event size called for sysex\n";
return -1;
}
+ std::cerr << "event size called for unknown status byte " << std::hex << (int) status << "\n";
return -1;
}
+/** Return the size of the given event including the status byte,
+ * or -1 if event is illegal.
+ */
+static inline int
+midi_event_size(const uint8_t* buffer)
+{
+ uint8_t status = buffer[0];
+
+ // Mask off channel if applicable
+ if (status >= 0x80 && status < 0xF0) {
+ status &= 0xF0;
+ }
+
+ // see http://www.midi.org/techspecs/midimessages.php
+ if (status == MIDI_CMD_COMMON_SYSEX) {
+ int end;
+
+ for (end = 1; buffer[end] != MIDI_CMD_COMMON_SYSEX_END; end++) {
+ if ((buffer[end] & 0x80) != 0) {
+ return -1;
+ }
+ }
+ assert(buffer[end] == MIDI_CMD_COMMON_SYSEX_END);
+ return end + 1;
+ } else {
+ return midi_event_size(status);
+ }
+}
+
+/** Return true iff the given buffer is a valid MIDI event.
+ * \a len must be exactly correct for the contents of \a buffer
+ */
+static inline bool
+midi_event_is_valid(const uint8_t* buffer, size_t len)
+{
+ uint8_t status = buffer[0];
+ if (status < 0x80) {
+ return false;
+ }
+ const int size = midi_event_size(buffer);
+ if (size < 0 || (size_t)size != len) {
+ return false;
+ }
+ if (status < 0xf0) {
+ /* Channel messages: all start with status byte followed by
+ * non status bytes.
+ */
+ for (size_t i = 1; i < len; ++i) {
+ if ((buffer[i] & 0x80) != 0) {
+ return false; // Non-status byte has MSb set
+ }
+ }
+ }
+ return true;
+}
+
} // namespace Evoral
#endif // EVORAL_MIDI_UTIL_H