X-Git-Url: https://main.carlh.net/gitweb/?a=blobdiff_plain;f=libs%2Fevoral%2Fevoral%2Fmidi_util.h;h=2ad5b3f3288ad8b6f23d25432b54d88b33bf091a;hb=196e910992659ea062da45499c1ac5906a0fa6c4;hp=2193e4c4b199ff8731947764a0213601967607f6;hpb=b6daa2d643c5cf4d07ae53b7e347b03e1bc145de;p=ardour.git

diff --git a/libs/evoral/evoral/midi_util.h b/libs/evoral/evoral/midi_util.h
index 2193e4c4b1..2ad5b3f328 100644
--- a/libs/evoral/evoral/midi_util.h
+++ b/libs/evoral/evoral/midi_util.h
@@ -1,16 +1,16 @@
 /* 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
@@ -19,17 +19,24 @@
 #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 including the status byte,
- * or -1 if unknown (eg sysex)
+ * 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) {
@@ -60,31 +67,38 @@ midi_event_size(unsigned char status)
 	case MIDI_CMD_COMMON_SENSING:
 	case MIDI_CMD_COMMON_RESET:
 		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
- * (which must be the first byte in \a buffer),
- * or -1 if unknown (eg sysex)
+/** Return the size of the given event including the status byte,
+ * or -1 if event is illegal.
  */
 static inline int
-midi_event_size(uint8_t* buffer)
+midi_event_size(const uint8_t* buffer)
 {
 	uint8_t status = buffer[0];
-	
-	// if we have a channel event
+
+	// Mask off channel if applicable
 	if (status >= 0x80 && status < 0xF0) {
-		status &= 0xF0; // mask off the channel
+		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++);
+
+		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 {
@@ -92,6 +106,35 @@ midi_event_size(uint8_t* buffer)
 	}
 }
 
+/** 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;
+}
+
+LIBEVORAL_API std::string midi_note_name (uint8_t noteval);
+
 } // namespace Evoral
 
 #endif // EVORAL_MIDI_UTIL_H