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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ *
+ * Ingen 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.
+ *
+ * Ingen 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 MIDINOTENODE_H
+#define MIDINOTENODE_H
+
+#include <string>
+#include "types.hpp"
+#include "NodeBase.hpp"
+
+namespace Ingen {
+
+class InputPort;
+class OutputPort;
+
+
+/** MIDI note input node.
+ *
+ * For pitched instruments like keyboard, etc.
+ *
+ * \ingroup engine
+ */
+class MidiNoteNode : public NodeBase
+{
+public:
+ MidiNoteNode(const std::string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size);
+ ~MidiNoteNode();
+
+ bool prepare_poly(uint32_t poly);
+ bool apply_poly(Raul::Maid& maid, uint32_t poly);
+
+ void process(ProcessContext& context);
+
+ void note_on(ProcessContext& context, uchar note_num, uchar velocity, FrameTime time);
+ void note_off(ProcessContext& context, uchar note_num, FrameTime time);
+ void all_notes_off(ProcessContext& context, FrameTime time);
+
+ void sustain_on(ProcessContext& context, FrameTime time);
+ void sustain_off(ProcessContext& context, FrameTime time);
+
+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; uint32_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(ProcessContext& context, uint32_t voice, FrameTime time);
+
+ Raul::Array<Voice>* _voices;
+ Raul::Array<Voice>* _prepared_voices;
+ Key _keys[128];
+ bool _sustain; ///< Whether or not hold pedal is depressed
+
+ InputPort* _midi_in_port;
+ OutputPort* _freq_port;
+ OutputPort* _vel_port;
+ OutputPort* _gate_port;
+ OutputPort* _trig_port;
+};
+
+
+} // namespace Ingen
+
+#endif // MIDINOTENODE_H