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-rw-r--r--src/engine/LV2Plugin.cpp275
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diff --git a/src/engine/LV2Plugin.cpp b/src/engine/LV2Plugin.cpp
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+/* 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 "LV2Plugin.h"
+#include <iostream>
+#include <cassert>
+#include "float.h"
+#include <stdint.h>
+#include <cmath>
+#include "InputPort.h"
+#include "OutputPort.h"
+#include "PortInfo.h"
+#include "Plugin.h"
+
+namespace Om {
+
+
+/** Partially construct a LV2Plugin.
+ *
+ * Object is not usable until instantiate() is called with success.
+ * (It _will_ crash!)
+ */
+LV2Plugin::LV2Plugin(const string& name,
+ size_t poly,
+ Patch* parent,
+ const SLV2Plugin* plugin,
+ samplerate srate,
+ size_t buffer_size)
+: NodeBase(name, poly, parent, srate, buffer_size),
+ m_lv2_plugin(plugin),
+ m_instances(NULL)
+{
+ assert(m_lv2_plugin);
+
+ // Note that this may be changed by an overriding DSSIPlugin
+ // ie do not assume m_ports is all LV2 plugin ports
+ m_num_ports = slv2_plugin_get_num_ports(m_lv2_plugin);
+}
+
+
+/** Instantiate self from LV2 plugin descriptor.
+ *
+ * Implemented as a seperate function (rather than in the constructor) to
+ * allow graceful error-catching of broken plugins.
+ *
+ * Returns whether or not plugin was successfully instantiated. If return
+ * value is false, this object may not be used.
+ */
+bool
+LV2Plugin::instantiate()
+{
+ m_ports.alloc(m_num_ports);
+
+ m_instances = new SLV2Instance*[m_poly];
+
+ size_t port_buffer_size = 0;
+
+ for (size_t i=0; i < m_poly; ++i) {
+ m_instances[i] = slv2_plugin_instantiate(m_lv2_plugin, m_srate, NULL);
+ if (m_instances[i] == NULL) {
+ cerr << "Failed to instantiate plugin!" << endl;
+ return false;
+ }
+ }
+
+ string port_name;
+ string port_path;
+
+ Port* port = NULL;
+
+ for (size_t j=0; j < m_num_ports; ++j) {
+ // LV2 shortnames are guaranteed to be unique
+ port_name = (char*)slv2_port_get_symbol(m_lv2_plugin, j);
+
+ string::size_type slash_index;
+
+ // Replace all slashes with "-" (so they don't screw up paths)
+ while ((slash_index = port_name.find("/")) != string::npos)
+ port_name[slash_index] = '-';
+
+ port_path = path() + "/" + port_name;
+
+ // Assumes there is only the 4 classes
+
+ SLV2PortClass port_class = slv2_port_get_class(m_lv2_plugin, j);
+ const bool is_control = (port_class == SLV2_CONTROL_RATE_INPUT
+ || port_class == SLV2_CONTROL_RATE_OUTPUT);
+ const bool is_input = (port_class == SLV2_CONTROL_RATE_INPUT
+ || port_class == SLV2_AUDIO_RATE_INPUT);
+
+ if (is_control)
+ port_buffer_size = 1;
+ else
+ port_buffer_size = m_buffer_size;
+
+ PortType type = is_control ? CONTROL : AUDIO;
+ PortDirection direction = is_input ? INPUT : OUTPUT;
+
+ if (is_input) {
+ port = new InputPort<sample>(this, port_name, j, m_poly,
+ new PortInfo(port_path, type, direction), port_buffer_size);
+ m_ports.at(j) = port;
+ } else /* output */ {
+ port = new OutputPort<sample>(this, port_name, j, m_poly,
+ new PortInfo(port_path, type, direction), port_buffer_size);
+ m_ports.at(j) = port;
+ }
+
+ assert(m_ports.at(j) != NULL);
+
+ PortInfo* pi = port->port_info();
+ get_port_vals(j, pi);
+
+ // Set default control val
+ if (pi->is_control())
+ ((PortBase<sample>*)port)->set_value(pi->default_val(), 0);
+ else
+ ((PortBase<sample>*)port)->set_value(0.0f, 0);
+ }
+ return true;
+}
+
+
+LV2Plugin::~LV2Plugin()
+{
+ for (size_t i=0; i < m_poly; ++i)
+ slv2_instance_free(m_instances[i]);
+
+ delete[] m_instances;
+}
+
+
+void
+LV2Plugin::activate()
+{
+ NodeBase::activate();
+
+ PortBase<sample>* port = NULL;
+
+ for (size_t i=0; i < m_poly; ++i) {
+ for (unsigned long j=0; j < m_num_ports; ++j) {
+ port = static_cast<PortBase<sample>*>(m_ports.at(j));
+ set_port_buffer(i, j, ((PortBase<sample>*)m_ports.at(j))->buffer(i)->data());
+ if (port->port_info()->is_control())
+ port->set_value(port->port_info()->default_val(), 0);
+ else if (port->port_info()->is_audio())
+ port->set_value(0.0f, 0);
+ }
+ slv2_instance_activate(m_instances[i]);
+ }
+}
+
+
+void
+LV2Plugin::deactivate()
+{
+ NodeBase::deactivate();
+
+ for (size_t i=0; i < m_poly; ++i)
+ slv2_instance_deactivate(m_instances[i]);
+}
+
+
+void
+LV2Plugin::run(size_t nframes)
+{
+ NodeBase::run(nframes); // mixes down input ports
+ for (size_t i=0; i < m_poly; ++i)
+ slv2_instance_run(m_instances[i], nframes);
+}
+
+
+void
+LV2Plugin::set_port_buffer(size_t voice, size_t port_num, void* buf)
+{
+ assert(voice < m_poly);
+
+ // Could be a MIDI port after this
+ if (port_num < m_num_ports) {
+ slv2_instance_connect_port(m_instances[voice], port_num, buf);
+ }
+}
+
+
+// Based on code stolen from jack-rack
+void
+LV2Plugin::get_port_vals(ulong port_index, PortInfo* info)
+{
+#if 0
+ LV2_Data upper = 0.0f;
+ LV2_Data lower = 0.0f;
+ LV2_Data normal = 0.0f;
+ LV2_PortRangeHintDescriptor hint_descriptor = m_descriptor->PortRangeHints[port_index].HintDescriptor;
+
+ /* set upper and lower, possibly adjusted to the sample rate */
+ if (LV2_IS_HINT_SAMPLE_RATE(hint_descriptor)) {
+ upper = m_descriptor->PortRangeHints[port_index].UpperBound * m_srate;
+ lower = m_descriptor->PortRangeHints[port_index].LowerBound * m_srate;
+ } else {
+ upper = m_descriptor->PortRangeHints[port_index].UpperBound;
+ lower = m_descriptor->PortRangeHints[port_index].LowerBound;
+ }
+
+ if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
+ /* FLT_EPSILON is defined as the different between 1.0 and the minimum
+ * float greater than 1.0. So, if lower is < FLT_EPSILON, it will be 1.0
+ * and the logarithmic control will have a base of 1 and thus not change
+ */
+ if (lower < FLT_EPSILON) lower = FLT_EPSILON;
+ }
+
+
+ if (LV2_IS_HINT_HAS_DEFAULT(hint_descriptor)) {
+
+ if (LV2_IS_HINT_DEFAULT_MINIMUM(hint_descriptor)) {
+ normal = lower;
+ } else if (LV2_IS_HINT_DEFAULT_LOW(hint_descriptor)) {
+ if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
+ normal = exp(log(lower) * 0.75 + log(upper) * 0.25);
+ } else {
+ normal = lower * 0.75 + upper * 0.25;
+ }
+ } else if (LV2_IS_HINT_DEFAULT_MIDDLE(hint_descriptor)) {
+ if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
+ normal = exp(log(lower) * 0.5 + log(upper) * 0.5);
+ } else {
+ normal = lower * 0.5 + upper * 0.5;
+ }
+ } else if (LV2_IS_HINT_DEFAULT_HIGH(hint_descriptor)) {
+ if (LV2_IS_HINT_LOGARITHMIC(hint_descriptor)) {
+ normal = exp(log(lower) * 0.25 + log(upper) * 0.75);
+ } else {
+ normal = lower * 0.25 + upper * 0.75;
+ }
+ } else if (LV2_IS_HINT_DEFAULT_MAXIMUM(hint_descriptor)) {
+ normal = upper;
+ } else if (LV2_IS_HINT_DEFAULT_0(hint_descriptor)) {
+ normal = 0.0;
+ } else if (LV2_IS_HINT_DEFAULT_1(hint_descriptor)) {
+ normal = 1.0;
+ } else if (LV2_IS_HINT_DEFAULT_100(hint_descriptor)) {
+ normal = 100.0;
+ } else if (LV2_IS_HINT_DEFAULT_440(hint_descriptor)) {
+ normal = 440.0;
+ }
+ } else { // No default hint
+ if (LV2_IS_HINT_BOUNDED_BELOW(hint_descriptor)) {
+ normal = lower;
+ } else if (LV2_IS_HINT_BOUNDED_ABOVE(hint_descriptor)) {
+ normal = upper;
+ }
+ }
+
+ info->min_val(lower);
+ info->default_val(normal);
+ info->max_val(upper);
+#endif
+}
+
+
+} // namespace Om
+
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