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-rw-r--r--src/engine/InternalController.cpp136
1 files changed, 136 insertions, 0 deletions
diff --git a/src/engine/InternalController.cpp b/src/engine/InternalController.cpp
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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
+ */
+
+#include <math.h>
+#include "raul/midi_events.h"
+#include "InternalController.hpp"
+#include "PostProcessor.hpp"
+#include "events/MidiLearnEvent.hpp"
+#include "events/SendPortValueEvent.hpp"
+#include "InputPort.hpp"
+#include "OutputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "AudioBuffer.hpp"
+#include "ProcessContext.hpp"
+#include "EventBuffer.hpp"
+#include "Engine.hpp"
+#include "util.hpp"
+
+namespace Ingen {
+
+static InternalPlugin controller_plugin(NS_INTERNALS "Controller", "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, 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_variable("lv2:minimum", 0.0f);
+ _param_port->set_variable("lv2:maximum", 127.0f);
+ _param_port->set_variable("lv2:integer", true);
+ _ports->at(1) = _param_port;
+
+ _log_port = new InputPort(this, "logarithmic", 2, 1, DataType::CONTROL, 0.0f, 1);
+ _log_port->set_variable("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());
+
+ 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, uchar control_num, uchar 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
+