refactor JACK MIDI port to allow writing from a non-process() thread, and move ARDOUR::MidiEvent into MIDI namespace along with midi_events.h header

git-svn-id: svn://localhost/ardour2/branches/3.0@3155 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 194 insertions, 0 deletions

diff --git a/libs/midi++2/midi++/event.h b/libs/midi++2/midi++/event.h
new file mode 100644
index 0000000000..6ef1c49ee9
--- /dev/null
+++ b/libs/midi++2/midi++/event.h
@@ -0,0 +1,194 @@
+/*
+    Copyright (C) 2007 Paul Davis 
+    Author: Dave Robillard
+
+    This program 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.
+
+    This program 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 more 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __libmidipp_midi_event_h__
+#define __libmidipp_midi_event_h__
+
+#include <stdint.h>
+#include <cstdlib>
+#include <cstring>
+#include <assert.h>
+
+#include <midi++/types.h>
+#include <midi++/events.h>
+
+/** If this is not defined, all methods of MidiEvent are RT safe
+ * but MidiEvent will never deep copy and (depending on the scenario)
+ * may not be usable in STL containers, signals, etc. 
+ */
+#define MIDI_EVENT_ALLOW_ALLOC 1
+
+namespace MIDI {
+
+
+/** Identical to jack_midi_event_t, but with double timestamp
+ *
+ * time is either a frame time (from/to Jack) or a beat time (internal
+ * tempo time, used in MidiModel) depending on context.
+ */
+struct Event {
+#ifdef MIDI_EVENT_ALLOW_ALLOC
+	Event(double t=0, uint32_t s=0, uint8_t* b=NULL, bool owns_buffer=false)
+		: _time(t)
+		, _size(s)
+		, _buffer(b)
+		, _owns_buffer(owns_buffer)
+	{
+		if (owns_buffer) {
+			_buffer = (uint8_t*)malloc(_size);
+			if (b)
+				memcpy(_buffer, b, _size);
+			else
+				memset(_buffer, 0, _size);
+		}
+	}
+	
+	/** Copy \a copy.
+	 * 
+	 * If \a owns_buffer is true, the buffer will be copied and this method
+	 * is NOT REALTIME SAFE.  Otherwise both events share a buffer and
+	 * memory management semantics are the caller's problem.
+	 */
+	Event(const Event& copy, bool owns_buffer)
+		: _time(copy._time)
+		, _size(copy._size)
+		, _buffer(copy._buffer)
+		, _owns_buffer(owns_buffer)
+	{
+		if (owns_buffer) {
+			_buffer = (uint8_t*)malloc(_size);
+			if (copy._buffer)
+				memcpy(_buffer, copy._buffer, _size);
+			else
+				memset(_buffer, 0, _size);
+		}
+	}
+	
+	~Event() {
+		if (_owns_buffer)
+			free(_buffer);
+	}
+
+	inline const Event& operator=(const Event& copy) {
+		_time = copy._time;
+		if (_owns_buffer) {
+			if (copy._buffer) {
+				if (!_buffer || _size < copy._size)
+					_buffer = (uint8_t*)::realloc(_buffer, copy._size);
+				memcpy(_buffer, copy._buffer, copy._size);
+			} else {
+				free(_buffer);
+				_buffer = NULL;
+			}
+		} else {
+			_buffer = copy._buffer;
+		}
+
+		_size = copy._size;
+		return *this;
+	}
+	
+	inline void set (uint8_t* msg, size_t msglen, timestamp_t t) {
+		if (_owns_buffer) {
+			if (_size < msglen) {
+				free (_buffer);
+				_buffer = (uint8_t*) malloc (msglen);
+			}
+		} else {
+			_buffer = (uint8_t*) malloc (msglen);
+			_owns_buffer = true;
+		}
+
+		memcpy (_buffer, msg, msglen);
+		_time = t;
+	}
+
+	inline bool operator==(const Event& other) const {
+		if (_time != other._time)
+			return false;
+
+		if (_size != other._size)
+			return false;
+
+		if (_buffer == other._buffer)
+			return true;
+
+		for (size_t i=0; i < _size; ++i)
+			if (_buffer[i] != other._buffer[i])
+				return false;
+
+		return true;
+	}
+	
+	inline bool operator!=(const Event& other) const { return ! operator==(other); }
+
+	inline bool owns_buffer() const { return _owns_buffer; }
+	
+	inline void set_buffer(uint8_t* buf, bool own) {
+		if (_owns_buffer) {
+			free(_buffer);
+			_buffer = NULL;
+		}
+		_buffer = buf;
+		_owns_buffer = own;
+	}
+
+	inline void realloc(size_t size) {
+		assert(_owns_buffer);
+		_buffer = (uint8_t*) ::realloc(_buffer, size);
+	}
+
+#else
+
+	inline void set_buffer(uint8_t* buf) { _buffer = buf; }
+
+#endif // MIDI_EVENT_ALLOW_ALLOC
+
+	inline double      time()        const { return _time; }
+	inline double&     time()              { return _time; }
+	inline uint32_t    size()        const { return _size; }
+	inline uint32_t&   size()              { return _size; }
+	inline uint8_t     type()        const { return (_buffer[0] & 0xF0); }
+	inline uint8_t     channel()     const { return (_buffer[0] & 0x0F); }
+        inline bool        is_note_on()  const { return (type() == MIDI_CMD_NOTE_ON); }
+        inline bool        is_note_off() const { return (type() == MIDI_CMD_NOTE_OFF); }
+        inline bool        is_cc()       const { return (type() == MIDI_CMD_CONTROL); }
+	inline bool        is_note()     const { return (is_note_on() || is_note_off()); }
+	inline uint8_t     note()        const { return (_buffer[1]); }
+	inline uint8_t     velocity()    const { return (_buffer[2]); }
+	inline uint8_t     cc_number()   const { return (_buffer[1]); }
+	inline uint8_t     cc_value()    const { return (_buffer[2]); }
+	inline const uint8_t* buffer()      const { return _buffer; }
+	inline uint8_t*&      buffer()            { return _buffer; }
+
+private:
+	double   _time;   /**< Sample index (or beat time) at which event is valid */
+	uint32_t _size;   /**< Number of uint8_ts of data in \a buffer */
+	uint8_t*    _buffer; /**< Raw MIDI data */
+
+#ifdef MIDI_EVENT_ALLOW_ALLOC
+	bool _owns_buffer; /**< Whether buffer is locally allocated */
+#endif
+};
+
+
+}
+
+#endif /* __libmidipp_midi_event_h__ */