Move internals to their own directory ala events.

git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@2070 a436a847-0d15-0410-975c-d299462d15a1

8 files changed, 1101 insertions, 0 deletions

diff --git a/src/engine/internals/Controller.cpp b/src/engine/internals/Controller.cpp
new file mode 100644
index 00000000..d615830a
--- /dev/null
+++ b/src/engine/internals/Controller.cpp
@@ -0,0 +1,141 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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
+ */
+
+#include <math.h>
+#include "raul/midi_events.h"
+#include "internals/Controller.hpp"
+#include "PostProcessor.hpp"
+#include "events/MidiLearn.hpp"
+#include "events/SendPortValue.hpp"
+#include "InputPort.hpp"
+#include "OutputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "AudioBuffer.hpp"
+#include "ProcessContext.hpp"
+#include "EventBuffer.hpp"
+#include "util.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+using namespace Shared;
+
+static InternalPlugin controller_plugin(NS_INTERNALS "Controller", "controller");
+
+ControllerNode::ControllerNode(const string& path,
+                               bool          polyphonic,
+                               PatchImpl*    parent,
+                               SampleRate    srate,
+                               size_t        buffer_size)
+	: NodeBase(&controller_plugin, path, false, parent, srate, buffer_size)
+	, _learning(false)
+{
+	_ports = new Raul::Array<PortImpl*>(6);
+
+	_midi_in_port = new InputPort(this, "input", 0, 1, DataType::EVENT, Raul::Atom(), _buffer_size);
+	_ports->at(0) = _midi_in_port;
+
+	_param_port = new InputPort(this, "controller", 1, 1, DataType::CONTROL, 0.0f, 1);
+	_param_port->set_property("lv2:minimum", 0.0f);
+	_param_port->set_property("lv2:maximum", 127.0f);
+	_param_port->set_property("lv2:integer", true);
+	_ports->at(1) = _param_port;
+
+	_log_port = new InputPort(this, "logarithmic", 2, 1, DataType::CONTROL, 0.0f, 1);
+	_log_port->set_property("lv2:toggled", true);
+	_ports->at(2) = _log_port;
+
+	_min_port = new InputPort(this, "minimum", 3, 1, DataType::CONTROL, 0.0f, 1);
+	_ports->at(3) = _min_port;
+
+	_max_port = new InputPort(this, "maximum", 4, 1, DataType::CONTROL, 1.0f, 1);
+	_ports->at(4) = _max_port;
+
+	_audio_port = new OutputPort(this, "ar_output", 5, 1, DataType::AUDIO, 0.0f, _buffer_size);
+	_ports->at(5) = _audio_port;
+}
+
+
+void
+ControllerNode::process(ProcessContext& context)
+{
+	NodeBase::pre_process(context);
+
+	uint32_t frames = 0;
+	uint32_t subframes = 0;
+	uint16_t type = 0;
+	uint16_t size = 0;
+	uint8_t* buf = NULL;
+
+	EventBuffer* const midi_in = (EventBuffer*)_midi_in_port->buffer(0);
+	//assert(midi_in->this_nframes() == context.nframes());
+
+	midi_in->rewind();
+
+	while (midi_in->get_event(&frames, &subframes, &type, &size, &buf)) {
+		// FIXME: type
+		if (size >= 3 && (buf[0] & 0xF0) == MIDI_CMD_CONTROL)
+			control(context, buf[1], buf[2], frames + context.start());
+
+		midi_in->increment();
+	}
+
+	NodeBase::post_process(context);
+}
+
+
+void
+ControllerNode::control(ProcessContext& context, uint8_t control_num, uint8_t val, FrameTime time)
+{
+	assert(time - context.start() < _buffer_size);
+
+	Sample scaled_value;
+
+	const Sample nval = (val / 127.0f); // normalized [0, 1]
+
+	if (_learning) {
+		_param_port->set_value(control_num);
+		((AudioBuffer*)_param_port->buffer(0))->set_value(
+				(float)control_num, context.start(), context.end());
+		_param_port->broadcast_value(context, true);
+		_learning = false;
+	}
+
+	const Sample min_port_val = ((AudioBuffer*)_min_port->buffer(0))->value_at(0);
+	const Sample max_port_val = ((AudioBuffer*)_max_port->buffer(0))->value_at(0);
+	const Sample log_port_val = ((AudioBuffer*)_log_port->buffer(0))->value_at(0);
+
+	if (log_port_val > 0.0f) {
+		// haaaaack, stupid negatives and logarithms
+		Sample log_offset = 0;
+		if (min_port_val < 0)
+			log_offset = fabs(min_port_val);
+		const Sample min = log(min_port_val + 1 + log_offset);
+		const Sample max = log(max_port_val + 1 + log_offset);
+		scaled_value = expf(nval * (max - min) + min) - 1 - log_offset;
+	} else {
+		scaled_value = ((nval) * (max_port_val - min_port_val)) + min_port_val;
+	}
+
+	if (control_num == ((AudioBuffer*)_param_port->buffer(0))->value_at(0))
+		((AudioBuffer*)_audio_port->buffer(0))->set_value(scaled_value, context.start(), time);
+}
+
+
+} // namespace Ingen
+
diff --git a/src/engine/internals/Controller.hpp b/src/engine/internals/Controller.hpp
new file mode 100644
index 00000000..e0c7de0f
--- /dev/null
+++ b/src/engine/internals/Controller.hpp
@@ -0,0 +1,62 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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 MIDICONTROLNODE_H
+#define MIDICONTROLNODE_H
+
+#include <string>
+#include "NodeBase.hpp"
+
+namespace Ingen {
+
+class InputPort;
+class OutputPort;
+
+
+/** MIDI control input node.
+ *
+ * Creating one of these nodes is how a user makes "MIDI Bindings".  Note that
+ * this node will always be monophonic, the poly parameter is ignored.
+ *
+ * \ingroup engine
+ */
+class ControllerNode : public NodeBase
+{
+public:
+	ControllerNode(const std::string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size);
+
+	void process(ProcessContext& context);
+
+	void control(ProcessContext& context, uint8_t control_num, uint8_t val, FrameTime time);
+
+	void learn() { _learning = true; }
+
+private:
+	bool _learning;
+
+	InputPort*  _midi_in_port;
+	InputPort*  _param_port;
+	InputPort*  _log_port;
+	InputPort*  _min_port;
+	InputPort*  _max_port;
+	OutputPort* _audio_port;
+};
+
+
+} // namespace Ingen
+
+#endif // MIDICONTROLNODE_H
diff --git a/src/engine/internals/Note.cpp b/src/engine/internals/Note.cpp
new file mode 100644
index 00000000..e3ba42d3
--- /dev/null
+++ b/src/engine/internals/Note.cpp
@@ -0,0 +1,392 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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
+ */
+
+#include "raul/Array.hpp"
+#include "raul/Maid.hpp"
+#include "raul/midi_events.h"
+#include <cmath>
+#include <iostream>
+#include "internals/Note.hpp"
+#include "AudioBuffer.hpp"
+#include "AudioDriver.hpp"
+#include "EventBuffer.hpp"
+#include "InputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "OutputPort.hpp"
+#include "PatchImpl.hpp"
+#include "ProcessContext.hpp"
+#include "util.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+using namespace Shared;
+
+static InternalPlugin note_plugin(NS_INTERNALS "Note", "note");
+
+NoteNode::NoteNode(const string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size)
+	: NodeBase(&note_plugin, path, polyphonic, parent, srate, buffer_size)
+	, _voices(new Raul::Array<Voice>(_polyphony))
+	, _prepared_voices(NULL)
+	, _sustain(false)
+{
+	_ports = new Raul::Array<PortImpl*>(5);
+
+	_midi_in_port = new InputPort(this, "input", 0, 1, DataType::EVENT, Raul::Atom(), _buffer_size);
+	_ports->at(0) = _midi_in_port;
+
+	_freq_port = new OutputPort(this, "frequency", 1, _polyphony, DataType::AUDIO, 440.0f, _buffer_size);
+	_ports->at(1) = _freq_port;
+
+	_vel_port = new OutputPort(this, "velocity", 2, _polyphony, DataType::AUDIO, 0.0f, _buffer_size);
+	_vel_port->set_property("lv2:minimum", 0.0f);
+	_vel_port->set_property("lv2:maximum", 1.0f);
+	_ports->at(2) = _vel_port;
+
+	_gate_port = new OutputPort(this, "gate", 3, _polyphony, DataType::AUDIO, 0.0f, _buffer_size);
+	_gate_port->set_property("lv2:toggled", true);
+	_ports->at(3) = _gate_port;
+
+	_trig_port = new OutputPort(this, "trigger", 4, _polyphony, DataType::AUDIO, 0.0f, _buffer_size);
+	_trig_port->set_property("lv2:toggled", true);
+	_ports->at(4) = _trig_port;
+}
+
+
+NoteNode::~NoteNode()
+{
+	delete _voices;
+}
+
+
+bool
+NoteNode::prepare_poly(uint32_t poly)
+{
+	if (!_polyphonic)
+		return true;
+
+	NodeBase::prepare_poly(poly);
+
+	if (_prepared_voices && poly <= _prepared_voices->size())
+		return true;
+
+	_prepared_voices = new Raul::Array<Voice>(poly, *_voices);
+
+	return true;
+}
+
+
+bool
+NoteNode::apply_poly(Raul::Maid& maid, uint32_t poly)
+{
+	if (!_polyphonic)
+		return true;
+
+	NodeBase::apply_poly(maid, poly);
+
+	if (_prepared_voices) {
+		assert(poly <= _prepared_voices->size());
+		maid.push(_voices);
+		_voices = _prepared_voices;
+		_prepared_voices = NULL;
+	}
+
+	_polyphony = poly;
+	assert(_voices->size() >= _polyphony);
+
+	return true;
+}
+
+
+void
+NoteNode::process(ProcessContext& context)
+{
+	EventBuffer* const midi_in = (EventBuffer*)_midi_in_port->buffer(0);
+	NodeBase::pre_process(context);
+
+	uint32_t frames    = 0;
+	uint32_t subframes = 0;
+	uint16_t type      = 0;
+	uint16_t size      = 0;
+	uint8_t* buf       = NULL;
+
+	//assert(midi_in->this_nframes() == context.nframes());
+
+	midi_in->rewind();
+
+	if (midi_in->event_count() > 0)
+	while (midi_in->get_event(&frames, &subframes, &type, &size, &buf)) {
+
+		/*cout << "EVENT TYPE " << type << " @ " << frames << "." << subframes << ": ";
+		for (uint16_t i = 0; i < size; ++i)
+			cout << (int)((char)buf[i]) << " ";
+		cout << endl;*/
+
+		const FrameTime time = context.start() + (FrameTime)frames;
+
+		if (size >= 3) {
+			switch (buf[0] & 0xF0) {
+			case MIDI_CMD_NOTE_ON:
+				if (buf[2] == 0)
+					note_off(context, buf[1], time);
+				else
+					note_on(context, buf[1], buf[2], time);
+				break;
+			case MIDI_CMD_NOTE_OFF:
+				note_off(context, buf[1], time);
+				break;
+			case MIDI_CMD_CONTROL:
+				switch (buf[1]) {
+				case MIDI_CTL_ALL_NOTES_OFF:
+				case MIDI_CTL_ALL_SOUNDS_OFF:
+					all_notes_off(context, time);
+					break;
+				case MIDI_CTL_SUSTAIN:
+					if (buf[2] > 63)
+						sustain_on(context, time);
+					else
+						sustain_off(context, time);
+					break;
+				case MIDI_CMD_BENDER:
+					// ?
+					break;
+				default:
+					//cerr << "Ignored controller " << buf[1] << endl;
+					break;
+				}
+				break;
+			default:
+				//fprintf(stderr, "Unknown (size %d) MIDI event %X\n", size, buf[0]);
+				break;
+			}
+		} else {
+			//fprintf(stderr, "Unknown (size %d) MIDI event %X\n", size, buf[0]);
+		}
+
+		if (midi_in->increment() == midi_in->this_nframes())
+			break;
+	}
+
+	NodeBase::post_process(context);
+}
+
+
+void
+NoteNode::note_on(ProcessContext& context, uint8_t note_num, uint8_t velocity, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+	assert(note_num <= 127);
+
+	Key*   key         = &_keys[note_num];
+	Voice* voice       = NULL;
+	uint32_t voice_num = 0;
+
+	if (key->state != Key::OFF) {
+		//cerr << "[NoteNode] Double midi note received" << endl;
+		return;
+	}
+
+	// Look for free voices
+	for (uint32_t i=0; i < _polyphony; ++i) {
+		if ((*_voices)[i].state == Voice::Voice::FREE) {
+			voice = &(*_voices)[i];
+			voice_num = i;
+			break;
+		}
+	}
+
+	// If we didn't find a free one, steal the oldest
+	if (voice == NULL) {
+		voice_num = 0;
+		voice = &(*_voices)[0];
+		FrameTime oldest_time = (*_voices)[0].time;
+		for (uint32_t i=1; i < _polyphony; ++i) {
+			if ((*_voices)[i].time < oldest_time) {
+				voice = &(*_voices)[i];
+				voice_num = i;
+				oldest_time = voice->time;
+			}
+		}
+	}
+	assert(voice != NULL);
+	assert(voice == &(*_voices)[voice_num]);
+
+	/*cerr << "[NoteNode] Note " << (int)note_num << " on @ " << time
+		<< ". Voice " << voice_num << " / " << _polyphony << endl;*/
+
+	// Update stolen key, if applicable
+	if (voice->state == Voice::Voice::ACTIVE) {
+		assert(_keys[voice->note].state == Key::ON_ASSIGNED);
+		assert(_keys[voice->note].voice == voice_num);
+		_keys[voice->note].state = Key::Key::ON_UNASSIGNED;
+		//cerr << "[NoteNode] Stole voice " << voice_num << endl;
+	}
+
+	// Store key information for later reallocation on note off
+	key->state = Key::Key::ON_ASSIGNED;
+	key->voice = voice_num;
+	key->time  = time;
+
+	// Trigger voice
+	voice->state = Voice::Voice::ACTIVE;
+	voice->note  = note_num;
+	voice->time  = time;
+
+	assert(_keys[voice->note].state == Key::Key::ON_ASSIGNED);
+	assert(_keys[voice->note].voice == voice_num);
+
+	((AudioBuffer*)_freq_port->buffer(voice_num))->set_value(note_to_freq(note_num), context.start(), time);
+	((AudioBuffer*)_vel_port->buffer(voice_num))->set_value(velocity/127.0, context.start(), time);
+	((AudioBuffer*)_gate_port->buffer(voice_num))->set_value(1.0f, context.start(), time);
+
+	// trigger (one sample)
+	((AudioBuffer*)_trig_port->buffer(voice_num))->set_value(1.0f, context.start(), time);
+	((AudioBuffer*)_trig_port->buffer(voice_num))->set_value(0.0f, context.start(), time + 1);
+
+	assert(key->state == Key::Key::ON_ASSIGNED);
+	assert(voice->state == Voice::Voice::ACTIVE);
+	assert(key->voice == voice_num);
+	assert((*_voices)[key->voice].note == note_num);
+}
+
+
+void
+NoteNode::note_off(ProcessContext& context, uint8_t note_num, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	Key* key = &_keys[note_num];
+
+	//cerr << "[NoteNode] Note " << (int)note_num << " off @ " << time << endl;
+
+	if (key->state == Key::ON_ASSIGNED) {
+		// Assigned key, turn off voice and key
+		if ((*_voices)[key->voice].state == Voice::ACTIVE) {
+			assert((*_voices)[key->voice].note == note_num);
+
+			if ( ! _sustain) {
+				//cerr << "... free voice " << key->voice << endl;
+				free_voice(context, key->voice, time);
+			} else {
+				//cerr << "... hold voice " << key->voice << endl;
+				(*_voices)[key->voice].state = Voice::HOLDING;
+			}
+
+		} else {
+#ifndef NDEBUG
+			cerr << "WARNING: Assigned key, but voice not active" << endl;
+#endif
+		}
+	}
+
+	key->state = Key::OFF;
+}
+
+
+void
+NoteNode::free_voice(ProcessContext& context, uint32_t voice, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	// Find a key to reassign to the freed voice (the newest, if there is one)
+	Key*    replace_key     = NULL;
+	uint8_t replace_key_num = 0;
+
+	for (uint8_t i = 0; i <= 127; ++i) {
+		if (_keys[i].state == Key::ON_UNASSIGNED) {
+			if (replace_key == NULL || _keys[i].time > replace_key->time) {
+				replace_key = &_keys[i];
+				replace_key_num = i;
+			}
+		}
+	}
+
+	if (replace_key != NULL) {  // Found a key to assign to freed voice
+		assert(&_keys[replace_key_num] == replace_key);
+		assert(replace_key->state == Key::ON_UNASSIGNED);
+
+		// Change the freq but leave the gate high and don't retrigger
+		((AudioBuffer*)_freq_port->buffer(voice))->set_value(note_to_freq(replace_key_num), context.start(), time);
+
+		replace_key->state = Key::ON_ASSIGNED;
+		replace_key->voice = voice;
+		_keys[(*_voices)[voice].note].state = Key::ON_UNASSIGNED;
+		(*_voices)[voice].note = replace_key_num;
+		(*_voices)[voice].state = Voice::ACTIVE;
+	} else {
+		// No new note for voice, deactivate (set gate low)
+		//cerr << "[NoteNode] Note off. Key " << (int)note_num << ", Voice " << voice << " Killed" << endl;
+		((AudioBuffer*)_gate_port->buffer(voice))->set_value(0.0f, context.start(), time);
+		(*_voices)[voice].state = Voice::FREE;
+	}
+}
+
+
+void
+NoteNode::all_notes_off(ProcessContext& context, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	//cerr << "All notes off @ " << offset << endl;
+
+	// FIXME: set all keys to Key::OFF?
+
+	for (uint32_t i = 0; i < _polyphony; ++i) {
+		((AudioBuffer*)_gate_port->buffer(i))->set_value(0.0f, context.start(), time);
+		(*_voices)[i].state = Voice::FREE;
+	}
+}
+
+
+float
+NoteNode::note_to_freq(int num)
+{
+	static const float A4 = 440.0f;
+	if (num >= 0 && num <= 119)
+		return A4 * powf(2.0f, (float)(num - 57.0f) / 12.0f);
+	return 1.0f;  // Some LADSPA plugins don't like freq=0
+}
+
+
+void
+NoteNode::sustain_on(ProcessContext& context, FrameTime time)
+{
+	_sustain = true;
+}
+
+
+void
+NoteNode::sustain_off(ProcessContext& context, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	_sustain = false;
+
+	for (uint32_t i=0; i < _polyphony; ++i)
+		if ((*_voices)[i].state == Voice::HOLDING)
+			free_voice(context, i, time);
+}
+
+
+} // namespace Ingen
+
diff --git a/src/engine/internals/Note.hpp b/src/engine/internals/Note.hpp
new file mode 100644
index 00000000..b14ba604
--- /dev/null
+++ b/src/engine/internals/Note.hpp
@@ -0,0 +1,88 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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 NoteNode : public NodeBase
+{
+public:
+	NoteNode(const std::string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size);
+	~NoteNode();
+
+	bool prepare_poly(uint32_t poly);
+	bool apply_poly(Raul::Maid& maid, uint32_t poly);
+
+	void process(ProcessContext& context);
+
+	void note_on(ProcessContext& context, uint8_t note_num, uint8_t velocity, FrameTime time);
+	void note_off(ProcessContext& context, uint8_t 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; uint8_t 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
diff --git a/src/engine/internals/Transport.cpp b/src/engine/internals/Transport.cpp
new file mode 100644
index 00000000..3355f4d8
--- /dev/null
+++ b/src/engine/internals/Transport.cpp
@@ -0,0 +1,156 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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
+ */
+
+#include "internals/Transport.hpp"
+#include <jack/transport.h>
+#include "OutputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "JackAudioDriver.hpp"
+#include "PortImpl.hpp"
+#include "util.hpp"
+//#include "Engine.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+static InternalPlugin transport_plugin(NS_INTERNALS "Transport", "transport");
+
+TransportNode::TransportNode(const string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size)
+	: NodeBase(&transport_plugin, path, false, parent, srate, buffer_size)
+{
+#if 0
+	_num_ports = 10;
+	_ports.alloc(_num_ports);
+
+	OutputPort<Sample>* spb_port = new OutputPort<Sample>(this, "Seconds per Beat", 0, 1,
+	//	new PortInfo("Seconds per Beat", CONTROL, OUTPUT, 0, 0, 1), 1);
+	_ports.at(0) = spb_port;
+
+	OutputPort<Sample>* bpb_port = new OutputPort<Sample>(this, "Beats per Bar", 1, 1,
+	//	new PortInfo("Beats per Bar", CONTROL, OUTPUT, 0, 0, 1), 1);
+	_ports.at(1) = bpb_port;
+
+	OutputPort<Sample>* bar_port = new OutputPort<Sample>(this, "Bar", 3, 1,
+//		new PortInfo("Bar", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(2) = bar_port;
+
+	OutputPort<Sample>* beat_port = new OutputPort<Sample>(this, "Beat", 3, 1,
+	//	new PortInfo("Beat", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(3) = beat_port;
+
+	OutputPort<Sample>* frame_port = new OutputPort<Sample>(this, "Frame", 3, 1,
+	//	new PortInfo("Frame", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(4) = frame_port;
+
+	OutputPort<Sample>* hour_port = new OutputPort<Sample>(this, "Hour", 3, 1,
+	//	new PortInfo("Hour", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(5) = hour_port;
+
+	OutputPort<Sample>* minute_port = new OutputPort<Sample>(this, "Minute", 3, 1,
+	//	new PortInfo("Minute", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(6) = minute_port;
+
+	OutputPort<Sample>* second_port = new OutputPort<Sample>(this, "Second", 3, 1,
+	//	new PortInfo("Second", CONTROL, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(7) = second_port;
+
+	OutputPort<Sample>* trg_port = new OutputPort<Sample>(this, "Beat Tick", 2, 1,
+	//	new PortInfo("Beat Tick", AUDIO, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(8) = trg_port;
+
+	OutputPort<Sample>* bar_trig_port = new OutputPort<Sample>(this, "Bar Tick", 3, 1,
+	//	new PortInfo("Bar Tick", AUDIO, OUTPUT, 0, 0, 1), buffer_size);
+	_ports.at(9) = bar_trig_port;
+#endif
+}
+
+
+void
+TransportNode::process(ProcessContext& context)
+{
+	NodeBase::pre_process(context);
+#if 0
+
+	// FIXME: this will die horribly with any driver other than jack (in theory)
+	const jack_position_t* const position = ((JackAudioDriver*)Engine::instance().audio_driver())->position();
+	jack_transport_state_t state = ((JackAudioDriver*)Engine::instance().audio_driver())->transport_state();
+	double bpm = position->beats_per_minute;
+	float bpb = position->beats_per_bar;
+	float spb = 60.0 / bpm;
+
+	//cerr << "bpm = " << bpm << endl;
+	//cerr << "spb = " << spb << endl;
+
+	if (position->valid & JackPositionBBT) {
+		cerr << "bar: " << position->bar << endl;
+		cerr << "beat: " << position->beat << endl;
+		cerr << "tick: " << position->tick << endl;
+	} else {
+		cerr << "No BBT" << endl;
+	}
+
+	if (position->valid & JackBBTFrameOffset) {
+		cerr << "bbt_offset: " << position->bbt_offset << endl;
+	} else {
+		cerr << "No BBT offset" << endl;
+	}
+
+	if (position->valid & JackPositionTimecode) {
+		double time = position->frame_time;
+		cerr << "Seconds: " << time << " : " << endl;
+		/*time /= 60.0;
+		cerr << "Minutes: " << time << " : ";
+		time /= 60.0;
+		cerr << "Hours: " << time << " : ";*/
+	} else {
+		cerr << "No timecode." << endl;
+	}
+
+
+	((OutputPort<Sample>*)_ports.at(0))->buffer(0)->set(spb, 0, 0);
+	((OutputPort<Sample>*)_ports.at(1))->buffer(0)->set(bpb, 0, 0);
+
+	// fill the trigger buffers with zeros
+	((OutputPort<Sample>*)_ports.at(2))->buffer(0)->set(0.0f, 0, nframes - 1);
+	((OutputPort<Sample>*)_ports.at(3))->buffer(0)->set(0.0f, 0, nframes - 1);
+
+	// if the transport is rolling, add triggers at the right frame positions
+	if ((position->valid & JackTransportBBT) && (state == JackTransportRolling)) {
+		double frames_per_beat = position->frame_rate * spb;
+		double first_beat = (1.0f - position->tick / position->ticks_per_beat) * frames_per_beat;
+		int first_beat_no = position->beat;
+		if (first_beat >= frames_per_beat) {
+			first_beat -= frames_per_beat;
+			--first_beat_no;
+		}
+		for ( ; first_beat < nframes; first_beat += frames_per_beat) {
+			((OutputPort<Sample>*)_ports.at(2))->buffer(0)->set(1.0f, size_t(first_beat));
+			if (first_beat_no % int(bpb) == 0) {
+				((OutputPort<Sample>*)_ports.at(3))->buffer(0)->set(1.0f, size_t(first_beat));
+				++first_beat_no;
+			}
+		}
+	}
+	#endif
+
+	NodeBase::post_process(context);
+}
+
+
+} // namespace Ingen
+
diff --git a/src/engine/internals/Transport.hpp b/src/engine/internals/Transport.hpp
new file mode 100644
index 00000000..3947b235
--- /dev/null
+++ b/src/engine/internals/Transport.hpp
@@ -0,0 +1,45 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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 TRANSPORTNODE_H
+#define TRANSPORTNODE_H
+
+#include <string>
+#include <jack/transport.h>
+#include "NodeBase.hpp"
+
+namespace Ingen {
+
+
+/** Transport Node, brings timing information into patches.
+ *
+ * This node uses the Jack transport API to get information about BPM, time
+ * signature, etc.. all sample accurate.  Using this you can do
+ * tempo-synced effects or even synthesis, etc.
+ */
+class TransportNode : public NodeBase
+{
+public:
+	TransportNode(const std::string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size);
+
+	virtual void process(ProcessContext& context);
+};
+
+
+} // namespace Ingen
+
+#endif // TRANSPORTNODE_H
diff --git a/src/engine/internals/Trigger.cpp b/src/engine/internals/Trigger.cpp
new file mode 100644
index 00000000..cb7ae2fe
--- /dev/null
+++ b/src/engine/internals/Trigger.cpp
@@ -0,0 +1,152 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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
+ */
+
+#include <cmath>
+#include "raul/midi_events.h"
+#include "internals/Trigger.hpp"
+#include "AudioBuffer.hpp"
+#include "EventBuffer.hpp"
+#include "InputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "OutputPort.hpp"
+#include "ProcessContext.hpp"
+#include "util.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+using namespace Shared;
+
+static InternalPlugin trigger_plugin(NS_INTERNALS "Trigger", "trigger");
+
+TriggerNode::TriggerNode(const string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size)
+	: NodeBase(&trigger_plugin, path, false, parent, srate, buffer_size)
+	, _learning(false)
+{
+	_ports = new Raul::Array<PortImpl*>(5);
+
+	_midi_in_port = new InputPort(this, "input", 0, 1, DataType::EVENT, Raul::Atom(), _buffer_size);
+	_ports->at(0) = _midi_in_port;
+
+	_note_port = new InputPort(this, "note", 1, 1, DataType::CONTROL, 60.0f, 1);
+	_note_port->set_property("lv2:minimum", 0.0f);
+	_note_port->set_property("lv2:maximum", 127.0f);
+	_note_port->set_property("lv2:integer", true);
+	_ports->at(1) = _note_port;
+
+	_gate_port = new OutputPort(this, "gate", 2, 1, DataType::AUDIO, 0.0f, _buffer_size);
+	_gate_port->set_property("lv2:toggled", true);
+	_ports->at(2) = _gate_port;
+
+	_trig_port = new OutputPort(this, "trigger", 3, 1, DataType::AUDIO, 0.0f, _buffer_size);
+	_trig_port->set_property("lv2:toggled", true);
+	_ports->at(3) = _trig_port;
+
+	_vel_port = new OutputPort(this, "velocity", 4, 1, DataType::AUDIO, 0.0f, _buffer_size);
+	_vel_port->set_property("lv2:minimum", 0.0f);
+	_vel_port->set_property("lv2:maximum", 1.0f);
+	_ports->at(4) = _vel_port;
+}
+
+
+void
+TriggerNode::process(ProcessContext& context)
+{
+	NodeBase::pre_process(context);
+
+	uint32_t frames = 0;
+	uint32_t subframes = 0;
+	uint16_t type = 0;
+	uint16_t size = 0;
+	uint8_t* buf = NULL;
+
+	EventBuffer* const midi_in = (EventBuffer*)_midi_in_port->buffer(0);
+	//assert(midi_in->this_nframes() == context.nframes());
+
+	midi_in->rewind();
+
+	while (midi_in->get_event(&frames, &subframes, &type, &size, &buf)) {
+		const FrameTime time = context.start() + (FrameTime)frames;
+
+		if (size >= 3) {
+			switch (buf[0] & 0xF0) {
+			case MIDI_CMD_NOTE_ON:
+				if (buf[2] == 0)
+					note_off(context, buf[1], time);
+				else
+					note_on(context, buf[1], buf[2], time);
+				break;
+			case MIDI_CMD_NOTE_OFF:
+				note_off(context, buf[1], time);
+				break;
+			case MIDI_CMD_CONTROL:
+				if (buf[1] == MIDI_CTL_ALL_NOTES_OFF
+						|| buf[1] == MIDI_CTL_ALL_SOUNDS_OFF)
+					((AudioBuffer*)_gate_port->buffer(0))->set_value(0.0f, context.start(), time);
+			default:
+				break;
+			}
+		}
+
+		midi_in->increment();
+	}
+
+	NodeBase::post_process(context);
+}
+
+
+void
+TriggerNode::note_on(ProcessContext& context, uint8_t note_num, uint8_t velocity, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	if (_learning) {
+		_note_port->set_value(note_num);
+		((AudioBuffer*)_note_port->buffer(0))->set_value(
+				(float)note_num, context.start(), context.end());
+		_note_port->broadcast_value(context, true);
+		_learning = false;
+	}
+
+	/*cerr << "[TriggerNode] " << path() << " Note " << (int)note_num << " on @ " << time << endl;*/
+
+	Sample filter_note = ((AudioBuffer*)_note_port->buffer(0))->value_at(0);
+	if (filter_note >= 0.0 && filter_note < 127.0 && (note_num == (uint8_t)filter_note)) {
+		((AudioBuffer*)_gate_port->buffer(0))->set_value(1.0f, context.start(), time);
+		((AudioBuffer*)_trig_port->buffer(0))->set_value(1.0f, context.start(), time);
+		((AudioBuffer*)_trig_port->buffer(0))->set_value(0.0f, context.start(), time + 1);
+		((AudioBuffer*)_vel_port->buffer(0))->set_value(velocity / 127.0f, context.start(), time);
+		assert(((AudioBuffer*)_trig_port->buffer(0))->data()[time - context.start()] == 1.0f);
+	}
+}
+
+
+void
+TriggerNode::note_off(ProcessContext& context, uint8_t note_num, FrameTime time)
+{
+	assert(time >= context.start() && time <= context.end());
+	assert(time - context.start() < _buffer_size);
+
+	if (note_num == lrintf(((AudioBuffer*)_note_port->buffer(0))->value_at(0)))
+		((AudioBuffer*)_gate_port->buffer(0))->set_value(0.0f, context.start(), time);
+}
+
+
+} // namespace Ingen
+
diff --git a/src/engine/internals/Trigger.hpp b/src/engine/internals/Trigger.hpp
new file mode 100644
index 00000000..973b9b41
--- /dev/null
+++ b/src/engine/internals/Trigger.hpp
@@ -0,0 +1,65 @@
+/* This file is part of Ingen.
+ * Copyright (C) 2007-2009 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 MIDITRIGGERNODE_H
+#define MIDITRIGGERNODE_H
+
+#include <string>
+#include "NodeBase.hpp"
+
+namespace Ingen {
+
+class InputPort;
+class OutputPort;
+
+
+/** MIDI trigger input node.
+ *
+ * Just has a gate,  for drums etc.  A control port is used to select
+ * which note number is responded to.
+ *
+ * Note that this node is always monophonic, the poly parameter is ignored.
+ * (Should that change?)
+ *
+ * \ingroup engine
+ */
+class TriggerNode : public NodeBase
+{
+public:
+	TriggerNode(const std::string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size);
+
+	void process(ProcessContext& context);
+
+	void note_on(ProcessContext& context, uint8_t note_num, uint8_t velocity, FrameTime time);
+	void note_off(ProcessContext& context, uint8_t note_num, FrameTime time);
+
+	void learn() { _learning = true; }
+
+private:
+	bool _learning;
+
+	InputPort*  _midi_in_port;
+	InputPort*  _note_port;
+	OutputPort* _gate_port;
+	OutputPort* _trig_port;
+	OutputPort* _vel_port;
+};
+
+
+} // namespace Ingen
+
+#endif // MIDITRIGGERNODE_H