int main()
{
AudioGraphRef graph = new AudioGraph();
/*------------------------------------------------------------------------
* Create a simple envelope-modulated triangle wave.
*-----------------------------------------------------------------------*/
NodeRef triangle = new Triangle(1000);
NodeRef envelope = new ASR(0.01, 0.0, 0.1);
NodeRef output = triangle * envelope;
/*------------------------------------------------------------------------
* Pan the output across the stereo field.
*-----------------------------------------------------------------------*/
NodeRef panned = new Pan(2, output);
graph->add_output(panned);
graph->start();
while (true)
{
/*------------------------------------------------------------------------
* Periodically, retrigger the envelope, panned to a random location.
*-----------------------------------------------------------------------*/
usleep(random_integer(1e4, 1e6));
panned->set_input("pan", random_uniform(-1, 1));
envelope->trigger();
}
}
NodeRef Synth::instantiate(NodeDefinition *nodedef)
{
/*------------------------------------------------------------------------
* Recursively instantiate the subgraph specified in NodeDefinition.
* Does not currently support graphs that route one node to multiple
* inputs.
*-----------------------------------------------------------------------*/
NodeRegistry *registry = NodeRegistry::global();
Node *node = registry->create(nodedef->name);
NodeRef noderef = NodeRef(node);
/*------------------------------------------------------------------------
* Update the synth's internal collection of node refs.
*-----------------------------------------------------------------------*/
this->nodes.insert(noderef);
for (auto param : nodedef->params)
{
std::string param_name = param.first;
NodeRef param_node = this->instantiate(param.second);
noderef->set_input(param_name, param_node);
}
if (nodedef->is_constant)
{
Constant *constant = (Constant *) node;
constant->value = nodedef->value;
}
if (!nodedef->input_name.empty())
{
this->inputs[nodedef->input_name] = noderef;
}
return noderef;
}
