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-rw-r--r--src/engine/MidiTriggerNode.cpp135
1 files changed, 135 insertions, 0 deletions
diff --git a/src/engine/MidiTriggerNode.cpp b/src/engine/MidiTriggerNode.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 <cmath>
+#include <raul/midi_events.h>
+#include "MidiTriggerNode.hpp"
+#include "AudioBuffer.hpp"
+#include "InputPort.hpp"
+#include "OutputPort.hpp"
+#include "InternalPlugin.hpp"
+#include "ProcessContext.hpp"
+#include "EventBuffer.hpp"
+#include "util.hpp"
+
+using namespace std;
+
+namespace Ingen {
+
+
+MidiTriggerNode::MidiTriggerNode(const string& path, bool polyphonic, PatchImpl* parent, SampleRate srate, size_t buffer_size)
+ : NodeBase(new InternalPlugin(NS_INGEN "trigger_node", "trigger", "MIDI Trigger"),
+ path, false, parent, srate, buffer_size)
+{
+ _ports = new Raul::Array<PortImpl*>(5);
+
+ _midi_in_port = new InputPort(this, "input", 0, 1, DataType::EVENT, 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_variable("ingen:minimum", 0.0f);
+ _note_port->set_variable("ingen:maximum", 127.0f);
+ _note_port->set_variable("ingen:integer", true);
+ _ports->at(1) = _note_port;
+
+ _gate_port = new OutputPort(this, "gate", 2, 1, DataType::AUDIO, 0.0f, _buffer_size);
+ _ports->at(2) = _gate_port;
+
+ _trig_port = new OutputPort(this, "trigger", 3, 1, DataType::AUDIO, 0.0f, _buffer_size);
+ _ports->at(3) = _trig_port;
+
+ _vel_port = new OutputPort(this, "velocity", 4, 1, DataType::AUDIO, 0.0f, _buffer_size);
+ _ports->at(4) = _vel_port;
+}
+
+
+void
+MidiTriggerNode::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)) {
+ 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
+MidiTriggerNode::note_on(ProcessContext& context, uchar note_num, uchar velocity, FrameTime time)
+{
+ assert(time >= context.start() && time <= context.end());
+ assert(time - context.start() < _buffer_size);
+
+ /*cerr << "[MidiTriggerNode] " << 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 == (uchar)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
+MidiTriggerNode::note_off(ProcessContext& context, uchar 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
+