Rename Ingen::Engine to Ingen::Server (hopefully avoid odd name clases and fix #675).

git-svn-id: http://svn.drobilla.net/lad/trunk/ingen@3184 a436a847-0d15-0410-975c-d299462d15a1

8 files changed, 1269 insertions, 0 deletions

diff --git a/src/server/internals/Controller.cpp b/src/server/internals/Controller.cpp
new file mode 100644
index 00000000..3d477de6
--- /dev/null
+++ b/src/server/internals/Controller.cpp
@@ -0,0 +1,147 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 "shared/LV2URIMap.hpp"
+#include "internals/Controller.hpp"
+#include "PostProcessor.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 {
+namespace Server {
+namespace Internals {
+
+InternalPlugin* ControllerNode::internal_plugin(Shared::LV2URIMap& uris) {
+	return new InternalPlugin(uris, NS_INTERNALS "Controller", "controller");
+}
+
+ControllerNode::ControllerNode(InternalPlugin* plugin,
+                               BufferFactory&  bufs,
+                               const string&   path,
+                               bool            polyphonic,
+                               PatchImpl*      parent,
+                               SampleRate      srate)
+	: NodeImpl(plugin, path, false, parent, srate)
+	, _learning(false)
+{
+	const Ingen::Shared::LV2URIMap& uris = bufs.uris();
+	_ports = new Raul::Array<PortImpl*>(6);
+
+	_midi_in_port = new InputPort(bufs, this, "input", 0, 1, PortType::EVENTS, Raul::Atom());
+	_midi_in_port->set_property(uris.lv2_name, "Input");
+	_ports->at(0) = _midi_in_port;
+
+	_param_port = new InputPort(bufs, this, "controller", 1, 1, PortType::CONTROL, 0.0f);
+	_param_port->set_property(uris.lv2_minimum, 0.0f);
+	_param_port->set_property(uris.lv2_maximum, 127.0f);
+	_param_port->set_property(uris.lv2_integer, true);
+	_param_port->set_property(uris.lv2_name, "Controller");
+	_ports->at(1) = _param_port;
+
+	_log_port = new InputPort(bufs, this, "logarithmic", 2, 1, PortType::CONTROL, 0.0f);
+	_log_port->set_property(uris.lv2_portProperty, uris.lv2_toggled);
+	_log_port->set_property(uris.lv2_name, "Logarithmic");
+	_ports->at(2) = _log_port;
+
+	_min_port = new InputPort(bufs, this, "minimum", 3, 1, PortType::CONTROL, 0.0f);
+	_min_port->set_property(uris.lv2_name, "Minimum");
+	_ports->at(3) = _min_port;
+
+	_max_port = new InputPort(bufs, this, "maximum", 4, 1, PortType::CONTROL, 1.0f);
+	_max_port->set_property(uris.lv2_name, "Maximum");
+	_ports->at(4) = _max_port;
+
+	_audio_port = new OutputPort(bufs, this, "ar_output", 5, 1, PortType::AUDIO, 0.0f);
+	_audio_port->set_property(uris.lv2_name, "Output");
+	_ports->at(5) = _audio_port;
+}
+
+void
+ControllerNode::process(ProcessContext& context)
+{
+	NodeImpl::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).get();
+
+	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();
+	}
+
+	NodeImpl::post_process(context);
+}
+
+void
+ControllerNode::control(ProcessContext& context, uint8_t control_num, uint8_t val, FrameTime time)
+{
+	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).get())->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).get())->value_at(0);
+	const Sample max_port_val = ((AudioBuffer*)_max_port->buffer(0).get())->value_at(0);
+	const Sample log_port_val = ((AudioBuffer*)_log_port->buffer(0).get())->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).get())->value_at(0))
+		((AudioBuffer*)_audio_port->buffer(0).get())->set_value(scaled_value, context.start(), time);
+}
+
+} // namespace Internals
+} // namespace Server
+} // namespace Ingen
+
diff --git a/src/server/internals/Controller.hpp b/src/server/internals/Controller.hpp
new file mode 100644
index 00000000..30ef663f
--- /dev/null
+++ b/src/server/internals/Controller.hpp
@@ -0,0 +1,74 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_INTERNALS_CONTROLLER_HPP
+#define INGEN_INTERNALS_CONTROLLER_HPP
+
+#include <string>
+#include "NodeImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace Internals {
+
+/** 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 NodeImpl
+{
+public:
+	ControllerNode(
+			InternalPlugin*    plugin,
+			BufferFactory&     bufs,
+			const std::string& path,
+			bool               polyphonic,
+			PatchImpl*         parent,
+			SampleRate         srate);
+
+	void process(ProcessContext& context);
+
+	void control(ProcessContext& context, uint8_t control_num, uint8_t val, FrameTime time);
+
+	void learn() { _learning = true; }
+
+	static InternalPlugin* internal_plugin(Shared::LV2URIMap& uris);
+
+private:
+	bool _learning;
+
+	InputPort*  _midi_in_port;
+	InputPort*  _param_port;
+	InputPort*  _log_port;
+	InputPort*  _min_port;
+	InputPort*  _max_port;
+	OutputPort* _audio_port;
+};
+
+} // namespace Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_CONTROLLER_HPP
diff --git a/src/server/internals/Delay.cpp b/src/server/internals/Delay.cpp
new file mode 100644
index 00000000..5c2758da
--- /dev/null
+++ b/src/server/internals/Delay.cpp
@@ -0,0 +1,208 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 <limits.h>
+#include "raul/log.hpp"
+#include "raul/Array.hpp"
+#include "raul/Maid.hpp"
+#include "raul/midi_events.h"
+#include "shared/LV2URIMap.hpp"
+#include "internals/Delay.hpp"
+#include "AudioBuffer.hpp"
+#include "Driver.hpp"
+#include "EventBuffer.hpp"
+#include "InputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "OutputPort.hpp"
+#include "PatchImpl.hpp"
+#include "ProcessContext.hpp"
+#include "ingen-config.h"
+#include "util.hpp"
+
+#define LOG(s) s << "[DelayNode] "
+
+#define CALC_DELAY(delaytime) \
+        (f_clamp (delaytime * (float)sample_rate, 1.0f, (float)(buffer_mask + 1)))
+
+using namespace std;
+using namespace Raul;
+
+namespace Ingen {
+namespace Server {
+namespace Internals {
+
+static const float MAX_DELAY_SECONDS = 8.0f;
+
+InternalPlugin* DelayNode::internal_plugin(Shared::LV2URIMap& uris) {
+	return new InternalPlugin(uris, NS_INTERNALS "Delay", "delay");
+}
+
+DelayNode::DelayNode(
+		InternalPlugin*    plugin,
+		BufferFactory&     bufs,
+		const std::string& path,
+		bool               polyphonic,
+		PatchImpl*         parent,
+		SampleRate         srate)
+	: NodeImpl(plugin, path, polyphonic, parent, srate)
+	, _buffer(0)
+	, _buffer_length(0)
+	, _buffer_mask(0)
+	, _write_phase(0)
+{
+	const Ingen::Shared::LV2URIMap& uris = bufs.uris();
+	_ports = new Raul::Array<PortImpl*>(3);
+
+	const float default_delay = 1.0f;
+	_last_delay_time = default_delay;
+	_delay_samples = default_delay;
+
+	_delay_port = new InputPort(bufs, this, "delay", 1, _polyphony, PortType::CONTROL, default_delay);
+	_delay_port->set_property(uris.lv2_name, "Delay");
+	_delay_port->set_property(uris.lv2_default, default_delay);
+	_delay_port->set_property(uris.lv2_minimum, (float)(1.0/(double)srate));
+	_delay_port->set_property(uris.lv2_maximum, MAX_DELAY_SECONDS);
+	_ports->at(0) = _delay_port;
+
+	_in_port = new InputPort(bufs, this, "in", 0, 1, PortType::AUDIO, 0.0f);
+	_in_port->set_property(uris.lv2_name, "Input");
+	_ports->at(1) = _in_port;
+
+	_out_port = new OutputPort(bufs, this, "out", 0, 1, PortType::AUDIO, 0.0f);
+	_out_port->set_property(uris.lv2_name, "Output");
+	_ports->at(2) = _out_port;
+
+	//_buffer = bufs.get(PortType::AUDIO, bufs.audio_buffer_size(buffer_length_frames), true);
+
+}
+
+DelayNode::~DelayNode()
+{
+	//_buffer.reset();
+	free(_buffer);
+}
+
+void
+DelayNode::activate(BufferFactory& bufs)
+{
+	NodeImpl::activate(bufs);
+	const SampleCount min_size = MAX_DELAY_SECONDS * _srate;
+
+	// Smallest power of two larger than min_size
+	SampleCount size = 1;
+	while (size < min_size)
+		size <<= 1;
+
+	_buffer = (float*)calloc(size, sizeof(float));
+	_buffer_mask = size - 1;
+	_buffer_length = size;
+	//_buffer->clear();
+	_write_phase = 0;
+}
+
+static inline float f_clamp(float x, float a, float b)
+{
+	const float x1 = fabs(x - a);
+	const float x2 = fabs(x - b);
+
+	x = x1 + a + b;
+	x -= x2;
+	x *= 0.5;
+
+	return x;
+}
+
+static inline float cube_interp(const float fr, const float inm1, const float
+                                in, const float inp1, const float inp2)
+{
+	return in + 0.5f * fr * (inp1 - inm1 +
+	 fr * (4.0f * inp1 + 2.0f * inm1 - 5.0f * in - inp2 +
+	 fr * (3.0f * (in - inp1) - inm1 + inp2)));
+}
+
+void
+DelayNode::process(ProcessContext& context)
+{
+	AudioBuffer* const delay_buf = (AudioBuffer*)_delay_port->buffer(0).get();
+	AudioBuffer* const in_buf    = (AudioBuffer*)_in_port->buffer(0).get();
+	AudioBuffer* const out_buf   = (AudioBuffer*)_out_port->buffer(0).get();
+
+	NodeImpl::pre_process(context);
+
+	DelayNode* plugin_data = this;
+
+	const float* const in            = in_buf->data();
+	float* const       out           = out_buf->data();
+	const float        delay_time    = delay_buf->data()[0];
+	const uint32_t     buffer_mask   = plugin_data->_buffer_mask;
+	const unsigned int sample_rate   = plugin_data->_srate;
+	float              delay_samples = plugin_data->_delay_samples;
+	long               write_phase   = plugin_data->_write_phase;
+	const uint32_t     sample_count  = context.nframes();
+
+	if (write_phase == 0) {
+		_last_delay_time = delay_time;
+		_delay_samples   = delay_samples = CALC_DELAY(delay_time);
+	}
+
+	if (delay_time == _last_delay_time) {
+		const long  idelay_samples = (long)delay_samples;
+		const float frac           = delay_samples - idelay_samples;
+
+		for (uint32_t i = 0; i < sample_count; i++) {
+			long read_phase = write_phase - (long)delay_samples;
+			const float read = cube_interp(frac,
+					buffer_at(read_phase - 1),
+					buffer_at(read_phase),
+					buffer_at(read_phase + 1),
+					buffer_at(read_phase + 2));
+			buffer_at(write_phase++) = in[i];
+			out[i] = read;
+		}
+	} else {
+		const float next_delay_samples  = CALC_DELAY(delay_time);
+		const float delay_samples_slope = (next_delay_samples - delay_samples) / sample_count;
+
+		for (uint32_t i = 0; i < sample_count; i++) {
+			delay_samples += delay_samples_slope;
+			write_phase++;
+			const long  read_phase     = write_phase - (long)delay_samples;
+			const long  idelay_samples = (long)delay_samples;
+			const float frac           = delay_samples - idelay_samples;
+			const float read           = cube_interp(frac,
+					buffer_at(read_phase - 1),
+					buffer_at(read_phase),
+					buffer_at(read_phase + 1),
+					buffer_at(read_phase + 2));
+			buffer_at(write_phase) = in[i];
+			out[i] = read;
+		}
+
+		_last_delay_time = delay_time;
+		_delay_samples   = delay_samples;
+	}
+
+	_write_phase = write_phase;
+
+	NodeImpl::post_process(context);
+}
+
+} // namespace Internals
+} // namespace Server
+} // namespace Ingen
+
diff --git a/src/server/internals/Delay.hpp b/src/server/internals/Delay.hpp
new file mode 100644
index 00000000..7456d7cc
--- /dev/null
+++ b/src/server/internals/Delay.hpp
@@ -0,0 +1,78 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_INTERNALS_DELAY_HPP
+#define INGEN_INTERNALS_DELAY_HPP
+
+#include <string>
+#include <math.h>
+#include "types.hpp"
+#include "NodeImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+class BufferFactory;
+
+namespace Internals {
+
+class DelayNode : public NodeImpl
+{
+public:
+	DelayNode(
+			InternalPlugin*    plugin,
+			BufferFactory&     bufs,
+			const std::string& path,
+			bool               polyphonic,
+			PatchImpl*         parent,
+			SampleRate         srate);
+
+	~DelayNode();
+
+	void activate(BufferFactory& bufs);
+
+	void process(ProcessContext& context);
+
+	static InternalPlugin* internal_plugin(Shared::LV2URIMap& uris);
+
+	float delay_samples() const { return _delay_samples; }
+
+private:
+	inline float& buffer_at(long phase) const { return _buffer[phase & _buffer_mask]; }
+
+	InputPort*  _delay_port;
+	InputPort*  _in_port;
+	OutputPort* _out_port;
+
+	typedef long Phase;
+
+	float*   _buffer;
+	uint32_t _buffer_length;
+	uint32_t _buffer_mask;
+	Phase    _write_phase;
+	float    _last_delay_time;
+	float    _delay_samples;
+};
+
+} // namespace Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_DELAY_HPP
diff --git a/src/server/internals/Note.cpp b/src/server/internals/Note.cpp
new file mode 100644
index 00000000..f28dacc1
--- /dev/null
+++ b/src/server/internals/Note.cpp
@@ -0,0 +1,416 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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/log.hpp"
+#include "raul/Array.hpp"
+#include "raul/Maid.hpp"
+#include "raul/midi_events.h"
+#include "shared/LV2URIMap.hpp"
+#include "internals/Note.hpp"
+#include "AudioBuffer.hpp"
+#include "Driver.hpp"
+#include "EventBuffer.hpp"
+#include "InputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "OutputPort.hpp"
+#include "PatchImpl.hpp"
+#include "ProcessContext.hpp"
+#include "util.hpp"
+#include "ingen-config.h"
+
+#define LOG(s) s << "[NoteNode] "
+
+using namespace std;
+using namespace Raul;
+
+namespace Ingen {
+namespace Server {
+namespace Internals {
+
+InternalPlugin* NoteNode::internal_plugin(Shared::LV2URIMap& uris) {
+	return new InternalPlugin(uris, NS_INTERNALS "Note", "note");
+}
+
+NoteNode::NoteNode(
+		InternalPlugin*    plugin,
+		BufferFactory&     bufs,
+		const std::string& path,
+		bool               polyphonic,
+		PatchImpl*         parent,
+		SampleRate         srate)
+	: NodeImpl(plugin, path, polyphonic, parent, srate)
+	, _voices(new Raul::Array<Voice>(_polyphony))
+	, _prepared_voices(NULL)
+	, _sustain(false)
+{
+	const Ingen::Shared::LV2URIMap& uris = bufs.uris();
+	_ports = new Raul::Array<PortImpl*>(5);
+
+	_midi_in_port = new InputPort(bufs, this, "input", 0, 1, PortType::EVENTS, Raul::Atom());
+	_midi_in_port->set_property(uris.lv2_name, "Input");
+	_ports->at(0) = _midi_in_port;
+
+	_freq_port = new OutputPort(bufs, this, "frequency", 1, _polyphony, PortType::AUDIO, 440.0f);
+	_freq_port->set_property(uris.lv2_name, "Frequency");
+	_ports->at(1) = _freq_port;
+
+	_vel_port = new OutputPort(bufs, this, "velocity", 2, _polyphony, PortType::AUDIO, 0.0f);
+	_vel_port->set_property(uris.lv2_minimum, 0.0f);
+	_vel_port->set_property(uris.lv2_maximum, 1.0f);
+	_vel_port->set_property(uris.lv2_name, "Velocity");
+	_ports->at(2) = _vel_port;
+
+	_gate_port = new OutputPort(bufs, this, "gate", 3, _polyphony, PortType::AUDIO, 0.0f);
+	_gate_port->set_property(uris.lv2_portProperty, uris.lv2_toggled);
+	_gate_port->set_property(uris.lv2_name, "Gate");
+	_ports->at(3) = _gate_port;
+
+	_trig_port = new OutputPort(bufs, this, "trigger", 4, _polyphony, PortType::AUDIO, 0.0f);
+	_trig_port->set_property(uris.lv2_portProperty, uris.lv2_toggled);
+	_trig_port->set_property(uris.lv2_name, "Trigger");
+	_ports->at(4) = _trig_port;
+}
+
+NoteNode::~NoteNode()
+{
+	delete _voices;
+}
+
+bool
+NoteNode::prepare_poly(BufferFactory& bufs, uint32_t poly)
+{
+	if (!_polyphonic)
+		return true;
+
+	NodeImpl::prepare_poly(bufs, poly);
+
+	if (_prepared_voices && poly <= _prepared_voices->size())
+		return true;
+
+	_prepared_voices = new Raul::Array<Voice>(poly, *_voices, Voice());
+
+	return true;
+}
+
+bool
+NoteNode::apply_poly(Raul::Maid& maid, uint32_t poly)
+{
+	if (!NodeImpl::apply_poly(maid, poly))
+		return false;
+
+	if (_prepared_voices) {
+		assert(_polyphony <= _prepared_voices->size());
+		maid.push(_voices);
+		_voices = _prepared_voices;
+		_prepared_voices = NULL;
+	}
+	assert(_polyphony <= _voices->size());
+
+	return true;
+}
+
+void
+NoteNode::process(ProcessContext& context)
+{
+	EventBuffer* const midi_in = (EventBuffer*)_midi_in_port->buffer(0).get();
+	NodeImpl::pre_process(context);
+
+	uint32_t frames    = 0;
+	uint32_t subframes = 0;
+	uint16_t type      = 0;
+	uint16_t size      = 0;
+	uint8_t* buf       = NULL;
+
+	midi_in->rewind();
+
+	if (midi_in->event_count() > 0)
+	for (midi_in->rewind(); midi_in->get_event(&frames, &subframes, &type, &size, &buf);
+			midi_in->increment()) {
+
+#ifdef RAUL_LOG_DEBUG
+		LOG(debug) << "EVENT TYPE " << type << " @ " << frames << "." << subframes << ": ";
+		for (uint16_t i = 0; i < size; ++i)
+			debug << (int)((char)buf[i]) << " ";
+		debug << endl;
+#endif
+
+		if (frames < context.offset())
+			continue;
+		if (frames > context.nframes())
+			break;
+
+		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:
+					//warn << "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]);
+		}
+	}
+
+	NodeImpl::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(note_num <= 127);
+
+	Key*   key         = &_keys[note_num];
+	Voice* voice       = NULL;
+	uint32_t voice_num = 0;
+
+	if (key->state != Key::OFF) {
+#ifdef RAUL_LOG_DEBUG
+		LOG(debug) << "Double midi note received" << endl;
+#endif
+		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]);
+
+#ifdef RAUL_LOG_DEBUG
+	LOG(debug) << "Note " << (int)note_num << " on @ " << time
+		<< ". Voice " << voice_num << " / " << _polyphony << endl;
+#endif
+
+	// 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;
+#ifdef RAUL_LOG_DEBUG
+		LOG(debug) << "Stole voice " << voice_num << endl;
+#endif
+	}
+
+	// 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).get())->set_value(
+			note_to_freq(note_num), context.start(), time);
+	((AudioBuffer*)_vel_port->buffer(voice_num).get())->set_value(
+			velocity/127.0, context.start(), time);
+	((AudioBuffer*)_gate_port->buffer(voice_num).get())->set_value(
+			1.0f, context.start(), time);
+
+	// trigger (one sample)
+	((AudioBuffer*)_trig_port->buffer(voice_num).get())->set_value(
+			1.0f, context.start(), time);
+	((AudioBuffer*)_trig_port->buffer(voice_num).get())->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());
+
+	Key* key = &_keys[note_num];
+
+#ifdef RAUL_LOG_DEBUG
+	debug << "Note " << (int)note_num << " off @ " << time << endl;
+#endif
+
+	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) {
+#ifdef RAUL_LOG_DEBUG
+				debug << "Free voice " << key->voice << endl;
+#endif
+				free_voice(context, key->voice, time);
+			} else {
+#ifdef RAUL_LOG_DEBUG
+				debug << "Hold voice " << key->voice << endl;
+#endif
+				(*_voices)[key->voice].state = Voice::HOLDING;
+			}
+
+		} else {
+#ifdef RAUL_LOG_DEBUG
+			debug << "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());
+
+	// 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).get())->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)
+#ifdef RAUL_LOG_DEBUG
+		LOG(debug) << "Note off: key " << (*_voices)[voice].note << " voice " << voice << endl;
+#endif
+		((AudioBuffer*)_gate_port->buffer(voice).get())->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());
+
+#ifdef RAUL_LOG_DEBUG
+	LOG(debug) << "All notes off @ " << time << endl;
+#endif
+
+	// FIXME: set all keys to Key::OFF?
+
+	for (uint32_t i = 0; i < _polyphony; ++i) {
+		((AudioBuffer*)_gate_port->buffer(i).get())->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;  // Frequency of zero causes numerical problems...
+}
+
+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());
+
+	_sustain = false;
+
+	for (uint32_t i=0; i < _polyphony; ++i)
+		if ((*_voices)[i].state == Voice::HOLDING)
+			free_voice(context, i, time);
+}
+
+} // namespace Internals
+} // namespace Server
+} // namespace Ingen
+
diff --git a/src/server/internals/Note.hpp b/src/server/internals/Note.hpp
new file mode 100644
index 00000000..d20baf13
--- /dev/null
+++ b/src/server/internals/Note.hpp
@@ -0,0 +1,101 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_INTERNALS_NOTE_HPP
+#define INGEN_INTERNALS_NOTE_HPP
+
+#include <string>
+#include "types.hpp"
+#include "NodeImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace Internals {
+
+/** MIDI note input node.
+ *
+ * For pitched instruments like keyboard, etc.
+ *
+ * \ingroup engine
+ */
+class NoteNode : public NodeImpl
+{
+public:
+	NoteNode(
+			InternalPlugin*    plugin,
+			BufferFactory&     bufs,
+			const std::string& path,
+			bool               polyphonic,
+			PatchImpl*         parent,
+			SampleRate         srate);
+
+	~NoteNode();
+
+	bool prepare_poly(BufferFactory& bufs, 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);
+
+	static InternalPlugin* internal_plugin(Shared::LV2URIMap& uris);
+
+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), time(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 Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_NOTE_HPP
diff --git a/src/server/internals/Trigger.cpp b/src/server/internals/Trigger.cpp
new file mode 100644
index 00000000..d062fa13
--- /dev/null
+++ b/src/server/internals/Trigger.cpp
@@ -0,0 +1,168 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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/log.hpp"
+#include "raul/midi_events.h"
+#include "shared/LV2URIMap.hpp"
+#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"
+#include "ingen-config.h"
+
+#define LOG(s) s << "[TriggerNode] "
+
+using namespace std;
+using namespace Raul;
+
+namespace Ingen {
+namespace Server {
+namespace Internals {
+
+InternalPlugin* TriggerNode::internal_plugin(Shared::LV2URIMap& uris) {
+	return new InternalPlugin(uris, NS_INTERNALS "Trigger", "trigger");
+}
+
+TriggerNode::TriggerNode(
+		InternalPlugin*    plugin,
+		BufferFactory&     bufs,
+		const std::string& path,
+		bool               polyphonic,
+		PatchImpl*         parent,
+		SampleRate         srate)
+	: NodeImpl(plugin, path, false, parent, srate)
+	, _learning(false)
+{
+	const Ingen::Shared::LV2URIMap& uris = bufs.uris();
+	_ports = new Raul::Array<PortImpl*>(5);
+
+	_midi_in_port = new InputPort(bufs, this, "input", 0, 1, PortType::EVENTS, Raul::Atom());
+	_midi_in_port->set_property(uris.lv2_name, "Input");
+	_ports->at(0) = _midi_in_port;
+
+	_note_port = new InputPort(bufs, this, "note", 1, 1, PortType::CONTROL, 60.0f);
+	_note_port->set_property(uris.lv2_minimum, 0.0f);
+	_note_port->set_property(uris.lv2_maximum, 127.0f);
+	_note_port->set_property(uris.lv2_integer, true);
+	_note_port->set_property(uris.lv2_name, "Note");
+	_ports->at(1) = _note_port;
+
+	_gate_port = new OutputPort(bufs, this, "gate", 2, 1, PortType::AUDIO, 0.0f);
+	_gate_port->set_property(uris.lv2_portProperty, uris.lv2_toggled);
+	_gate_port->set_property(uris.lv2_name, "Gate");
+	_ports->at(2) = _gate_port;
+
+	_trig_port = new OutputPort(bufs, this, "trigger", 3, 1, PortType::AUDIO, 0.0f);
+	_trig_port->set_property(uris.lv2_portProperty, uris.lv2_toggled);
+	_trig_port->set_property(uris.lv2_name, "Trigger");
+	_ports->at(3) = _trig_port;
+
+	_vel_port = new OutputPort(bufs, this, "velocity", 4, 1, PortType::AUDIO, 0.0f);
+	_vel_port->set_property(uris.lv2_minimum, 0.0f);
+	_vel_port->set_property(uris.lv2_maximum, 1.0f);
+	_vel_port->set_property(uris.lv2_name, "Velocity");
+	_ports->at(4) = _vel_port;
+}
+
+void
+TriggerNode::process(ProcessContext& context)
+{
+	NodeImpl::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).get();
+
+	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).get())->set_value(0.0f, context.start(), time);
+			default:
+				break;
+			}
+		}
+
+		midi_in->increment();
+	}
+
+	NodeImpl::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());
+
+	if (_learning) {
+		_note_port->set_value(note_num);
+		((AudioBuffer*)_note_port->buffer(0).get())->set_value(
+				(float)note_num, context.start(), context.end());
+		_note_port->broadcast_value(context, true);
+		_learning = false;
+	}
+
+#ifdef RAUL_LOG_DEBUG
+	LOG(debug) << path() << " note " << (int)note_num << " on @ " << time << endl;
+#endif
+
+	Sample filter_note = ((AudioBuffer*)_note_port->buffer(0).get())->value_at(0);
+	if (filter_note >= 0.0 && filter_note < 127.0 && (note_num == (uint8_t)filter_note)) {
+		((AudioBuffer*)_gate_port->buffer(0).get())->set_value(1.0f, context.start(), time);
+		((AudioBuffer*)_trig_port->buffer(0).get())->set_value(1.0f, context.start(), time);
+		((AudioBuffer*)_trig_port->buffer(0).get())->set_value(0.0f, context.start(), time + 1);
+		((AudioBuffer*)_vel_port->buffer(0).get())->set_value(velocity / 127.0f, context.start(), time);
+		assert(((AudioBuffer*)_trig_port->buffer(0).get())->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());
+
+	if (note_num == lrintf(((AudioBuffer*)_note_port->buffer(0).get())->value_at(0)))
+		((AudioBuffer*)_gate_port->buffer(0).get())->set_value(0.0f, context.start(), time);
+}
+
+} // namespace Internals
+} // namespace Server
+} // namespace Ingen
diff --git a/src/server/internals/Trigger.hpp b/src/server/internals/Trigger.hpp
new file mode 100644
index 00000000..92b85345
--- /dev/null
+++ b/src/server/internals/Trigger.hpp
@@ -0,0 +1,77 @@
+/* This file is part of Ingen.
+ * Copyright 2007-2011 David 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 INGEN_INTERNALS_TRIGGER_HPP
+#define INGEN_INTERNALS_TRIGGER_HPP
+
+#include <string>
+#include "NodeImpl.hpp"
+
+namespace Ingen {
+namespace Server {
+
+class InputPort;
+class OutputPort;
+class InternalPlugin;
+
+namespace Internals {
+
+/** 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 NodeImpl
+{
+public:
+	TriggerNode(
+			InternalPlugin*    plugin,
+			BufferFactory&     bufs,
+			const std::string& path,
+			bool               polyphonic,
+			PatchImpl*         parent,
+			SampleRate         srate);
+
+	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; }
+
+	static InternalPlugin* internal_plugin(Shared::LV2URIMap& uris);
+
+private:
+	bool _learning;
+
+	InputPort*  _midi_in_port;
+	InputPort*  _note_port;
+	OutputPort* _gate_port;
+	OutputPort* _trig_port;
+	OutputPort* _vel_port;
+};
+
+} // namespace Server
+} // namespace Ingen
+} // namespace Internals
+
+#endif // INGEN_INTERNALS_TRIGGER_HPP