272 lines
7.4 KiB
C++
272 lines
7.4 KiB
C++
/* This file is part of Om. Copyright (C) 2006 Dave Robillard.
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*
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* Om is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* Om is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "LV2Plugin.h"
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#include <iostream>
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#include <cassert>
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#include "float.h"
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#include <stdint.h>
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#include <cmath>
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#include "InputPort.h"
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#include "OutputPort.h"
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#include "PortInfo.h"
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#include "Plugin.h"
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namespace Om {
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/** Partially construct a LV2Plugin.
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*
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* Object is not usable until instantiate() is called with success.
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* (It _will_ crash!)
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*/
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LV2Plugin::LV2Plugin(const string& name,
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size_t poly,
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Patch* parent,
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const SLV2Plugin* plugin,
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samplerate srate,
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size_t buffer_size)
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: NodeBase(name, poly, parent, srate, buffer_size),
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m_lv2_plugin(plugin),
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m_instances(NULL)
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{
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assert(m_lv2_plugin);
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// Note that this may be changed by an overriding DSSIPlugin
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// ie do not assume m_ports is all LV2 plugin ports
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m_num_ports = slv2_plugin_get_num_ports(m_lv2_plugin);
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}
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/** Instantiate self from LV2 plugin descriptor.
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*
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* Implemented as a seperate function (rather than in the constructor) to
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* allow graceful error-catching of broken plugins.
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*
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* Returns whether or not plugin was successfully instantiated. If return
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* value is false, this object may not be used.
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*/
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bool
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LV2Plugin::instantiate()
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{
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m_ports.alloc(m_num_ports);
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m_instances = new SLV2Instance*[m_poly];
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size_t port_buffer_size = 0;
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for (size_t i=0; i < m_poly; ++i) {
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m_instances[i] = slv2_plugin_instantiate(m_lv2_plugin, m_srate, NULL);
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if (m_instances[i] == NULL) {
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cerr << "Failed to instantiate plugin!" << endl;
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return false;
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}
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}
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string port_name;
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string port_path;
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Port* port = NULL;
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for (size_t j=0; j < m_num_ports; ++j) {
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// LV2 shortnames are guaranteed to be unique, valid C identifiers
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port_name = (char*)slv2_port_get_symbol(m_lv2_plugin, j);
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assert(port_name.find("/") == string::npos);
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port_path = path() + "/" + port_name;
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// Assumes there is only the 4 classes
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SLV2PortClass port_class = slv2_port_get_class(m_lv2_plugin, j);
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const bool is_control = (port_class == SLV2_CONTROL_RATE_INPUT
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|| port_class == SLV2_CONTROL_RATE_OUTPUT);
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const bool is_input = (port_class == SLV2_CONTROL_RATE_INPUT
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|| port_class == SLV2_AUDIO_RATE_INPUT);
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if (is_control)
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port_buffer_size = 1;
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else
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port_buffer_size = m_buffer_size;
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PortType type = is_control ? CONTROL : AUDIO;
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PortDirection direction = is_input ? INPUT : OUTPUT;
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if (is_input) {
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port = new InputPort<sample>(this, port_name, j, m_poly,
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new PortInfo(port_path, type, direction), port_buffer_size);
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m_ports.at(j) = port;
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} else /* output */ {
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port = new OutputPort<sample>(this, port_name, j, m_poly,
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new PortInfo(port_path, type, direction), port_buffer_size);
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m_ports.at(j) = port;
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}
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assert(m_ports.at(j) != NULL);
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PortInfo* pi = port->port_info();
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get_port_vals(j, pi);
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// Set default control val
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if (pi->is_control())
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((PortBase<sample>*)port)->set_value(pi->default_val(), 0);
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else
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((PortBase<sample>*)port)->set_value(0.0f, 0);
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}
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return true;
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}
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LV2Plugin::~LV2Plugin()
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{
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for (size_t i=0; i < m_poly; ++i)
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slv2_instance_free(m_instances[i]);
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delete[] m_instances;
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}
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void
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LV2Plugin::activate()
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{
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NodeBase::activate();
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PortBase<sample>* port = NULL;
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for (size_t i=0; i < m_poly; ++i) {
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for (unsigned long j=0; j < m_num_ports; ++j) {
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port = static_cast<PortBase<sample>*>(m_ports.at(j));
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set_port_buffer(i, j, ((PortBase<sample>*)m_ports.at(j))->buffer(i)->data());
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if (port->port_info()->is_control())
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port->set_value(port->port_info()->default_val(), 0);
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else if (port->port_info()->is_audio())
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port->set_value(0.0f, 0);
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}
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slv2_instance_activate(m_instances[i]);
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}
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}
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void
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LV2Plugin::deactivate()
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{
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NodeBase::deactivate();
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for (size_t i=0; i < m_poly; ++i)
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slv2_instance_deactivate(m_instances[i]);
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}
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void
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LV2Plugin::run(size_t nframes)
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{
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NodeBase::run(nframes); // mixes down input ports
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for (size_t i=0; i < m_poly; ++i)
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slv2_instance_run(m_instances[i], nframes);
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}
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void
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LV2Plugin::set_port_buffer(size_t voice, size_t port_num, void* buf)
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{
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assert(voice < m_poly);
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// Could be a MIDI port after this
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if (port_num < m_num_ports) {
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slv2_instance_connect_port(m_instances[voice], port_num, buf);
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}
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}
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// Based on code stolen from jack-rack
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void
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LV2Plugin::get_port_vals(ulong port_index, PortInfo* info)
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{
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#if 0
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LV2_Data upper = 0.0f;
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LV2_Data lower = 0.0f;
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LV2_Data normal = 0.0f;
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LV2_PortRangeHintDescriptor hint_descriptor = m_descriptor->PortRangeHints[port_index].HintDescriptor;
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/* set upper and lower, possibly adjusted to the sample rate */
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if (LV2_IS_HINT_SAMPLE_RATE(hint_descriptor)) {
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upper = m_descriptor->PortRangeHints[port_index].UpperBound * m_srate;
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lower = m_descriptor->PortRangeHints[port_index].LowerBound * m_srate;
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} else {
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upper = m_descriptor->PortRangeHints[port_index].UpperBound;
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lower = m_descriptor->PortRangeHints[port_index].LowerBound;
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}
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if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
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/* FLT_EPSILON is defined as the different between 1.0 and the minimum
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* float greater than 1.0. So, if lower is < FLT_EPSILON, it will be 1.0
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* and the logarithmic control will have a base of 1 and thus not change
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*/
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if (lower < FLT_EPSILON) lower = FLT_EPSILON;
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}
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if (LV2_IS_HINT_HAS_DEFAULT(hint_descriptor)) {
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if (LV2_IS_HINT_DEFAULT_MINIMUM(hint_descriptor)) {
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normal = lower;
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} else if (LV2_IS_HINT_DEFAULT_LOW(hint_descriptor)) {
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if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
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normal = exp(log(lower) * 0.75 + log(upper) * 0.25);
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} else {
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normal = lower * 0.75 + upper * 0.25;
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}
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} else if (LV2_IS_HINT_DEFAULT_MIDDLE(hint_descriptor)) {
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if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
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normal = exp(log(lower) * 0.5 + log(upper) * 0.5);
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} else {
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normal = lower * 0.5 + upper * 0.5;
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}
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} else if (LV2_IS_HINT_DEFAULT_HIGH(hint_descriptor)) {
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if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
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normal = exp(log(lower) * 0.25 + log(upper) * 0.75);
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} else {
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normal = lower * 0.25 + upper * 0.75;
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}
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} else if (LV2_IS_HINT_DEFAULT_MAXIMUM(hint_descriptor)) {
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normal = upper;
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} else if (LV2_IS_HINT_DEFAULT_0(hint_descriptor)) {
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normal = 0.0;
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} else if (LV2_IS_HINT_DEFAULT_1(hint_descriptor)) {
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normal = 1.0;
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} else if (LV2_IS_HINT_DEFAULT_100(hint_descriptor)) {
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normal = 100.0;
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} else if (LV2_IS_HINT_DEFAULT_440(hint_descriptor)) {
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normal = 440.0;
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}
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} else { // No default hint
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if (LV2_IS_HINT_BOUNDED_BELOW(hint_descriptor)) {
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normal = lower;
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} else if (LV2_IS_HINT_BOUNDED_ABOVE(hint_descriptor)) {
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normal = upper;
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}
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}
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info->min_val(lower);
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info->default_val(normal);
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info->max_val(upper);
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#endif
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}
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} // namespace Om
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