bool
CreateBlock::pre_process()
{
typedef Resource::Properties::const_iterator iterator;
const Ingen::URIs& uris = _engine.world()->uris();
const SPtr<Store> store = _engine.store();
// Check sanity of target path
if (_path.is_root()) {
return Event::pre_process_done(Status::BAD_URI, _path);
} else if (store->get(_path)) {
return Event::pre_process_done(Status::EXISTS, _path);
} else if (!(_graph = dynamic_cast<GraphImpl*>(store->get(_path.parent())))) {
return Event::pre_process_done(Status::PARENT_NOT_FOUND, _path.parent());
}
// Map old ingen:prototype to new lv2:prototype
auto range = _properties.equal_range(uris.ingen_prototype);
for (auto i = range.first; i != range.second;) {
const auto value = i->second;
auto next = i;
next = _properties.erase(i);
_properties.insert(std::make_pair(uris.lv2_prototype, value));
i = next;
}
// Get prototype
iterator t = _properties.find(uris.lv2_prototype);
if (t == _properties.end() || !uris.forge.is_uri(t->second)) {
// Missing/invalid prototype
return Event::pre_process_done(Status::BAD_REQUEST);
}
const Raul::URI prototype(uris.forge.str(t->second, false));
// Find polyphony
const iterator p = _properties.find(uris.ingen_polyphonic);
const bool polyphonic = (p != _properties.end() &&
p->second.type() == uris.forge.Bool &&
p->second.get<int32_t>());
// Find and instantiate/duplicate prototype (plugin/existing node)
if (Node::uri_is_path(prototype)) {
// Prototype is an existing block
BlockImpl* const ancestor = dynamic_cast<BlockImpl*>(
store->get(Node::uri_to_path(prototype)));
if (!ancestor) {
return Event::pre_process_done(Status::PROTOTYPE_NOT_FOUND, prototype);
} else if (!(_block = ancestor->duplicate(
_engine, Raul::Symbol(_path.symbol()), _graph))) {
return Event::pre_process_done(Status::CREATION_FAILED, _path);
}
/* Replace prototype with the ancestor's. This is less informative,
but the client expects an actual LV2 plugin as prototype. */
_properties.erase(uris.ingen_prototype);
_properties.erase(uris.lv2_prototype);
_properties.insert(std::make_pair(uris.lv2_prototype,
uris.forge.make_urid(ancestor->plugin()->uri())));
} else {
// Prototype is a plugin
PluginImpl* const plugin = _engine.block_factory()->plugin(prototype);
if (!plugin) {
return Event::pre_process_done(Status::PROTOTYPE_NOT_FOUND, prototype);
} else if (!(_block = plugin->instantiate(*_engine.buffer_factory(),
Raul::Symbol(_path.symbol()),
polyphonic,
_graph,
_engine))) {
return Event::pre_process_done(Status::CREATION_FAILED, _path);
}
}
// Activate block
_block->properties().insert(_properties.begin(), _properties.end());
_block->activate(*_engine.buffer_factory());
// Add block to the store and the graph's pre-processor only block list
_graph->add_block(*_block);
store->add(_block);
/* Compile graph with new block added for insertion in audio thread
TODO: Since the block is not connected at this point, a full compilation
could be avoided and the block simply appended. */
if (_graph->enabled()) {
_compiled_graph = _graph->compile();
}
_update.put_block(_block);
return Event::pre_process_done(Status::SUCCESS);
}
