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Diffstat (limited to 'src/engine/InternalController.cpp')
| -rw-r--r-- | src/engine/InternalController.cpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/engine/InternalController.cpp b/src/engine/InternalController.cpp new file mode 100644 index 00000000..25c4570c --- /dev/null +++ b/src/engine/InternalController.cpp @@ -0,0 +1,136 @@ +/* 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 + |