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Diffstat (limited to 'src/libs/engine/MidiControlNode.cpp')
| -rw-r--r-- | src/libs/engine/MidiControlNode.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/libs/engine/MidiControlNode.cpp b/src/libs/engine/MidiControlNode.cpp new file mode 100644 index 00000000..2116c828 --- /dev/null +++ b/src/libs/engine/MidiControlNode.cpp @@ -0,0 +1,133 @@ +/* This file is part of Om. Copyright (C) 2006 Dave Robillard. + * + * Om 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. + * + * Om 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., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "MidiControlNode.h" +#include <math.h> +#include "Om.h" +#include "OmApp.h" +#include "PostProcessor.h" +#include "MidiLearnEvent.h" +#include "InputPort.h" +#include "OutputPort.h" +#include "PortInfo.h" +#include "Plugin.h" +#include "util.h" +#include "midi.h" + + +namespace Om { + + +MidiControlNode::MidiControlNode(const string& path, size_t poly, Patch* parent, samplerate srate, size_t buffer_size) +: InternalNode(path, 1, parent, srate, buffer_size), + m_learning(false) +{ + m_num_ports = 7; + m_ports.alloc(m_num_ports); + + m_midi_in_port = new InputPort<MidiMessage>(this, "MIDI In", 0, 1, + new PortInfo("MIDI In", MIDI, INPUT), m_buffer_size); + m_ports.at(0) = m_midi_in_port; + + m_param_port = new InputPort<sample>(this, "Controller Number", 1, 1, + new PortInfo("Controller Number", CONTROL, INPUT, INTEGER, 60, 0, 127), 1); + m_ports.at(1) = m_param_port; + m_log_port = new InputPort<sample>(this, "Logarithmic", 2, 1, + new PortInfo("Logarithmic", CONTROL, INPUT, TOGGLE, 0, 0, 1), 1); + m_ports.at(2) = m_log_port; + + m_min_port = new InputPort<sample>(this, "Min", 3, 1, + new PortInfo("Min", CONTROL, INPUT, NONE, 0, 0, 65535), 1); + m_ports.at(3) = m_min_port; + + m_max_port = new InputPort<sample>(this, "Max", 4, 1, + new PortInfo("Max", CONTROL, INPUT, NONE, 1, 0, 65535), 1); + m_ports.at(4) = m_max_port; + + m_audio_port = new OutputPort<sample>(this, "Out (AR)", 5, 1, + new PortInfo("Out (AR)", AUDIO, OUTPUT, 0, 0, 1), m_buffer_size); + m_ports.at(5) = m_audio_port; + + m_control_port = new OutputPort<sample>(this, "Out (CR)", 6, 1, + new PortInfo("Out (CR)", CONTROL, OUTPUT, 0, 0, 1), 1); + m_ports.at(6) = m_control_port; + + m_plugin.type(Plugin::Internal); + m_plugin.plug_label("midi_control_in"); + m_plugin.name("Om Control Node (MIDI)"); +} + + +void +MidiControlNode::run(size_t nframes) +{ + InternalNode::run(nframes); + + MidiMessage ev; + + for (size_t i=0; i < m_midi_in_port->buffer(0)->filled_size(); ++i) { + ev = m_midi_in_port->buffer(0)->value_at(i); + + if ((ev.buffer[0] & 0xF0) == MIDI_CMD_CONTROL) + control(ev.buffer[1], ev.buffer[2], ev.time); + } +} + + +void +MidiControlNode::control(uchar control_num, uchar val, samplecount offset) +{ + assert(offset < m_buffer_size); + + sample scaled_value; + + const sample nval = (val / 127.0f); // normalized [0, 1] + + if (m_learning) { + assert(m_learn_event != NULL); + m_param_port->set_value(control_num, offset); + assert(m_param_port->buffer(0)->value_at(0) == control_num); + m_learn_event->set_value(control_num); + m_learn_event->execute(offset); + om->post_processor()->push(m_learn_event); + om->post_processor()->signal(); + m_learning = false; + m_learn_event = NULL; + } + + if (m_log_port->buffer(0)->value_at(0) > 0.0f) { + // haaaaack, stupid negatives and logarithms + sample log_offset = 0; + if (m_min_port->buffer(0)->value_at(0) < 0) + log_offset = fabs(m_min_port->buffer(0)->value_at(0)); + const sample min = log(m_min_port->buffer(0)->value_at(0)+1+log_offset); + const sample max = log(m_max_port->buffer(0)->value_at(0)+1+log_offset); + scaled_value = expf(nval * (max - min) + min) - 1 - log_offset; + } else { + const sample min = m_min_port->buffer(0)->value_at(0); + const sample max = m_max_port->buffer(0)->value_at(0); + scaled_value = ((nval) * (max - min)) + min; + } + + if (control_num == m_param_port->buffer(0)->value_at(0)) { + m_control_port->set_value(scaled_value, offset); + m_audio_port->set_value(scaled_value, offset); + } +} + + +} // namespace Om + |