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Copyright (C) 2008 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include <pbd/compose.h>
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#include <pbd/error.h>
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#include <pbd/pathscanner.h>
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#include <pbd/xml++.h>
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#include <ardour/ardour.h>
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#include <ardour/session.h>
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#include <ardour/audioengine.h>
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#include <ardour/lv2_plugin.h>
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#include <pbd/stl_delete.h>
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using namespace ARDOUR;
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LV2Plugin::LV2Plugin (AudioEngine& e, Session& session, LV2World& world, SLV2Plugin plugin, nframes_t rate)
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init (world, plugin, rate);
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LV2Plugin::LV2Plugin (const LV2Plugin &other)
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, _world(other._world)
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init (other._world, other._plugin, other._sample_rate);
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for (uint32_t i = 0; i < parameter_count(); ++i) {
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_control_data[i] = other._shadow_data[i];
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_shadow_data[i] = other._shadow_data[i];
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LV2Plugin::init (LV2World& world, SLV2Plugin plugin, nframes_t rate)
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_latency_control_port = 0;
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_was_activated = false;
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_instance = slv2_plugin_instantiate(plugin, rate, NULL);
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_name = slv2_plugin_get_name(plugin);
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_author = slv2_plugin_get_author_name(plugin);
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error << _("LV2: Failed to instantiate plugin ") << slv2_plugin_get_uri(plugin) << endl;
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throw failed_constructor();
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if (slv2_plugin_has_feature(plugin, world.in_place_broken)) {
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error << string_compose(_("LV2: \"%1\" cannot be used, since it cannot do inplace processing"),
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slv2_value_as_string(_name));
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slv2_value_free(_name);
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slv2_value_free(_author);
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throw failed_constructor();
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const uint32_t num_ports = slv2_plugin_get_num_ports(plugin);
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_control_data = new float[num_ports];
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_shadow_data = new float[num_ports];
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_defaults = new float[num_ports];
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const bool latent = slv2_plugin_has_latency(plugin);
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uint32_t latency_port = (latent ? slv2_plugin_get_latency_port_index(plugin) : 0);
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for (uint32_t i = 0; i < num_ports; ++i) {
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if (parameter_is_control(i)) {
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SLV2Port port = slv2_plugin_get_port_by_index(plugin, i);
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slv2_port_get_range(plugin, port, &def, NULL, NULL);
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_defaults[i] = def ? slv2_value_as_float(def) : 0.0f;
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slv2_value_free(def);
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slv2_instance_connect_port (_instance, i, &_control_data[i]);
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if (latent && i == latency_port) {
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_latency_control_port = &_control_data[i];
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*_latency_control_port = 0;
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if (parameter_is_input(i)) {
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_shadow_data[i] = default_value (i);
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Plugin::setup_controls ();
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latency_compute_run ();
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LV2Plugin::~LV2Plugin ()
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GoingAway (); /* EMIT SIGNAL */
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slv2_instance_free(_instance);
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slv2_value_free(_name);
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slv2_value_free(_author);
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delete [] _control_data;
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delete [] _shadow_data;
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LV2Plugin::unique_id() const
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return slv2_value_as_uri(slv2_plugin_get_uri(_plugin));
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LV2Plugin::default_value (uint32_t port)
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return _defaults[port];
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LV2Plugin::set_parameter (uint32_t which, float val)
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if (which < slv2_plugin_get_num_ports(_plugin)) {
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_shadow_data[which] = val;
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ParameterChanged (which, val); /* EMIT SIGNAL */
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if (which < parameter_count() && controls[which]) {
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controls[which]->Changed ();
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warning << string_compose (_("Illegal parameter number used with plugin \"%1\"."
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"This is a bug in either Ardour or the LV2 plugin (%2)"),
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name(), unique_id()) << endmsg;
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LV2Plugin::get_parameter (uint32_t which) const
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if (parameter_is_input(which)) {
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return (float) _shadow_data[which];
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return (float) _control_data[which];
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LV2Plugin::nth_parameter (uint32_t n, bool& ok) const
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for (c = 0, x = 0; x < slv2_plugin_get_num_ports(_plugin); ++x) {
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if (parameter_is_control (x)) {
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LV2Plugin::get_state()
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XMLNode *root = new XMLNode(state_node_name());
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LocaleGuard lg (X_("POSIX"));
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for (uint32_t i = 0; i < parameter_count(); ++i){
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if (parameter_is_input(i) && parameter_is_control(i)) {
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child = new XMLNode("port");
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snprintf(buf, sizeof(buf), "%u", i);
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child->add_property("number", string(buf));
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snprintf(buf, sizeof(buf), "%+f", _shadow_data[i]);
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child->add_property("value", string(buf));
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root->add_child_nocopy (*child);
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if (i < controls.size() && controls[i]) {
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root->add_child_nocopy (controls[i]->get_state());
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LV2Plugin::save_preset (string name)
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return Plugin::save_preset (name, "lv2");
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LV2Plugin::set_state(const XMLNode& node)
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XMLNodeConstIterator iter;
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LocaleGuard lg (X_("POSIX"));
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if (node.name() != state_node_name()) {
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error << _("Bad node sent to LV2Plugin::set_state") << endmsg;
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nodes = node.children ("port");
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for(iter = nodes.begin(); iter != nodes.end(); ++iter){
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if ((prop = child->property("number")) != 0) {
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port = prop->value().c_str();
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warning << _("LV2: no lv2 port number") << endmsg;
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if ((prop = child->property("value")) != 0) {
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data = prop->value().c_str();
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warning << _("LV2: no lv2 port data") << endmsg;
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sscanf (port, "%" PRIu32, &port_id);
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set_parameter (port_id, atof(data));
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latency_compute_run ();
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LV2Plugin::get_parameter_descriptor (uint32_t which, ParameterDescriptor& desc) const
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SLV2Port port = slv2_plugin_get_port_by_index(_plugin, which);
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SLV2Value def, min, max;
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slv2_port_get_range(_plugin, port, &def, &min, &max);
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desc.integer_step = slv2_port_has_property(_plugin, port, _world.integer);
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desc.toggled = slv2_port_has_property(_plugin, port, _world.toggled);
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desc.logarithmic = false; // TODO (LV2 extension)
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desc.sr_dependent = slv2_port_has_property(_plugin, port, _world.srate);
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desc.label = slv2_value_as_string(slv2_port_get_name(_plugin, port));
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desc.lower = min ? slv2_value_as_float(min) : 0.0f;
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desc.upper = max ? slv2_value_as_float(max) : 1.0f;
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desc.min_unbound = false; // TODO (LV2 extension)
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desc.max_unbound = false; // TODO (LV2 extension)
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if (desc.integer_step) {
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desc.smallstep = 0.1;
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desc.largestep = 10.0;
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const float delta = desc.upper - desc.lower;
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desc.step = delta / 1000.0f;
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desc.smallstep = delta / 10000.0f;
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desc.largestep = delta/10.0f;
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slv2_value_free(def);
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slv2_value_free(min);
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slv2_value_free(max);
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LV2Plugin::describe_parameter (uint32_t which)
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if (which < parameter_count()) {
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SLV2Value name = slv2_port_get_name(_plugin,
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slv2_plugin_get_port_by_index(_plugin, which));
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string ret(slv2_value_as_string(name));
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slv2_value_free(name);
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LV2Plugin::latency () const
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if (_latency_control_port) {
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return (nframes_t) floor (*_latency_control_port);
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LV2Plugin::automatable () const
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for (uint32_t i = 0; i < parameter_count(); ++i){
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if (parameter_is_input(i) && parameter_is_control(i)) {
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ret.insert (ret.end(), i);
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LV2Plugin::connect_and_run (vector<Sample*>& bufs, uint32_t nbufs, int32_t& in_index, int32_t& out_index, nframes_t nframes, nframes_t offset)
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then = get_cycles ();
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while (port_index < parameter_count()) {
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if (parameter_is_audio(port_index)) {
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if (parameter_is_input(port_index)) {
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slv2_instance_connect_port(_instance, port_index,
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bufs[min((uint32_t)in_index, nbufs - 1)] + offset);
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} else if (parameter_is_output(port_index)) {
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slv2_instance_connect_port(_instance, port_index,
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bufs[min((uint32_t)out_index, nbufs - 1)] + offset);
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set_cycles ((uint32_t) (now - then));
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LV2Plugin::parameter_is_control (uint32_t param) const
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SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
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return slv2_port_is_a(_plugin, port, _world.control_class);
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LV2Plugin::parameter_is_audio (uint32_t param) const
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SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
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return slv2_port_is_a(_plugin, port, _world.audio_class);
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LV2Plugin::parameter_is_output (uint32_t param) const
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SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
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return slv2_port_is_a(_plugin, port, _world.output_class);
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LV2Plugin::parameter_is_input (uint32_t param) const
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SLV2Port port = slv2_plugin_get_port_by_index(_plugin, param);
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return slv2_port_is_a(_plugin, port, _world.input_class);
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LV2Plugin::print_parameter (uint32_t param, char *buf, uint32_t len) const
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if (param < parameter_count()) {
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snprintf (buf, len, "%.3f", get_parameter (param));
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LV2Plugin::run (nframes_t nframes)
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for (uint32_t i = 0; i < parameter_count(); ++i) {
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if (parameter_is_control(i) && parameter_is_input(i)) {
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_control_data[i] = _shadow_data[i];
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slv2_instance_run(_instance, nframes);
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LV2Plugin::latency_compute_run ()
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if (!_latency_control_port) {
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/* we need to run the plugin so that it can set its latency
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uint32_t port_index = 0;
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uint32_t in_index = 0;
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uint32_t out_index = 0;
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const nframes_t bufsize = 1024;
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float buffer[bufsize];
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memset(buffer,0,sizeof(float)*bufsize);
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/* Note that we've already required that plugins
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be able to handle in-place processing.
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while (port_index < parameter_count()) {
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if (parameter_is_audio (port_index)) {
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if (parameter_is_input (port_index)) {
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slv2_instance_connect_port (_instance, port_index, buffer);
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} else if (parameter_is_output (port_index)) {
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slv2_instance_connect_port (_instance, port_index, buffer);
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: world(slv2_world_new())
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slv2_world_load_all(world);
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input_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_INPUT);
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output_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_OUTPUT);
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control_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_CONTROL);
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audio_class = slv2_value_new_uri(world, SLV2_PORT_CLASS_AUDIO);
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in_place_broken = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "inPlaceBroken");
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integer = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "integer");
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toggled = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "toggled");
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srate = slv2_value_new_uri(world, SLV2_NAMESPACE_LV2 "sampleRate");
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LV2World::~LV2World()
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slv2_value_free(input_class);
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slv2_value_free(output_class);
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slv2_value_free(control_class);
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slv2_value_free(audio_class);
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slv2_value_free(in_place_broken);
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LV2PluginInfo::LV2PluginInfo (void* lv2_world, void* slv2_plugin)
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: _lv2_world(lv2_world)
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, _slv2_plugin(slv2_plugin)
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LV2PluginInfo::~LV2PluginInfo()
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LV2PluginInfo::load (Session& session)
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plugin.reset (new LV2Plugin (session.engine(), session,
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*(LV2World*)_lv2_world, (SLV2Plugin)_slv2_plugin, session.frame_rate()));
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plugin->set_info(PluginInfoPtr(new LV2PluginInfo(*this)));
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catch (failed_constructor &err) {
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return PluginPtr ((Plugin*) 0);
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LV2PluginInfo::discover (void* lv2_world)
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PluginInfoList plugs;
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LV2World* world = (LV2World*)lv2_world;
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SLV2Plugins plugins = slv2_world_get_all_plugins(world->world);
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for (unsigned i=0; i < slv2_plugins_size(plugins); ++i) {
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SLV2Plugin p = slv2_plugins_get_at(plugins, i);
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LV2PluginInfoPtr info (new LV2PluginInfo(lv2_world, p));
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SLV2Value name = slv2_plugin_get_name(p);
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info->name = string(slv2_value_as_string(name));
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slv2_value_free(name);
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SLV2PluginClass pclass = slv2_plugin_get_class(p);
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SLV2Value label = slv2_plugin_class_get_label(pclass);
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info->category = slv2_value_as_string(label);
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SLV2Value author_name = slv2_plugin_get_author_name(p);
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info->creator = author_name ? string(slv2_value_as_string(author_name)) : "Unknown";
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slv2_value_free(author_name);
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info->path = "/NOPATH"; // Meaningless for LV2
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info->n_inputs = slv2_plugin_get_num_ports_of_class(p,
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world->input_class, world->audio_class, NULL);
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info->n_outputs = slv2_plugin_get_num_ports_of_class(p,
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world->output_class, world->audio_class, NULL);
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info->unique_id = slv2_value_as_uri(slv2_plugin_get_uri(p));
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info->index = 0; // Meaningless for LV2
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plugs.push_back (info);