Added Om aka Graph aka god knows what

git-svn-id: http://svn.drobilla.net/lad/grauph@9 a436a847-0d15-0410-975c-d299462d15a1

1 files changed, 87 insertions, 0 deletions

diff --git a/src/engine/MidiNoteNode.h b/src/engine/MidiNoteNode.h
new file mode 100644
index 00000000..bf302144
--- /dev/null
+++ b/src/engine/MidiNoteNode.h
@@ -0,0 +1,87 @@
+/* This file is part of Om.  Copyright (C) 2006 Dave Robillard.
+ * 
+ * Om 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.
+ * 
+ * Om 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.,
+ * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef MIDINOTENODE_H
+#define MIDINOTENODE_H
+
+#include <string>
+#include "InternalNode.h"
+#include "util/types.h"
+
+using std::string;
+
+namespace Om {
+
+class MidiMessage;
+template <typename T> class InputPort;
+template <typename T> class OutputPort;
+
+
+/** MIDI note input node.
+ *
+ * For pitched instruments like keyboard, etc.
+ *
+ * \ingroup engine
+ */
+class MidiNoteNode : public InternalNode
+{
+public:
+	MidiNoteNode(const string& path, size_t poly, Patch* parent, samplerate srate, size_t buffer_size);
+	~MidiNoteNode();
+
+	void run(size_t nframes);
+	
+	void note_on(uchar note_num, uchar velocity, samplecount offset);
+	void note_off(uchar note_num, samplecount offset);
+	void all_notes_off(samplecount offset);
+
+	void sustain_on();
+	void sustain_off(samplecount offset);
+
+private:
+	
+	/** Key, one for each key on the keyboard */
+	struct Key {
+		enum State { OFF, ON_ASSIGNED, ON_UNASSIGNED };
+		Key() : state(OFF), voice(0), time(0) {}
+		State state; size_t voice; samplecount time;
+	};
+
+	/** Voice, one of these always exists for each voice */
+	struct Voice {
+		enum State { FREE, ACTIVE, HOLDING };
+		Voice() : state(FREE), note(0) {}
+		State state; uchar note; samplecount time;
+	};
+
+	float note_to_freq(int num);
+	void free_voice(size_t voice, samplecount offset);
+
+	Voice* m_voices;
+	Key    m_keys[128];
+	bool   m_sustain;   ///< Whether or not hold pedal is depressed
+	
+	InputPort<MidiMessage>* m_midi_in_port;
+	OutputPort<sample>*     m_freq_port;
+	OutputPort<sample>*     m_vel_port;
+	OutputPort<sample>*     m_gate_port;
+	OutputPort<sample>*     m_trig_port;
+};
+
+
+} // namespace Om
+
+#endif // MIDINOTENODE_H