303 lines
10 KiB
Rust
303 lines
10 KiB
Rust
use hexodsp::*;
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use std::sync::Arc;
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use std::sync::Mutex;
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fn main() {
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let (mut node_conf, node_exec) = new_node_engine();
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start_backend(node_exec, move || {
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// To get an overview of the existing nodes you can
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// take a look in the file src/dsp/mod.rs
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// where the `macro_rules! node_list` definition
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// is.
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//
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// This defines all supported nodes and their
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// parameters/inputs ports and their outputs.
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let sin = NodeId::Sin(0);
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let amp = NodeId::Amp(0);
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let out = NodeId::Out(0);
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let amp_gain_param = amp.inp_param("gain").unwrap();
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let sin_freq_param = sin.inp_param("freq").unwrap();
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// Create the nodes in the frontend and in the
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// audio backend. You only have to do this once
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// and it's up to you to track which nodes you
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// already created.
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//
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// Keep in mind, that the only way to deallocate
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// notes is to call `node_conf.delete_nodes()`,
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// which deletes all nodes.
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//
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// You can't delete only one specific node.
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node_conf.create_node(sin);
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node_conf.create_node(amp);
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node_conf.create_node(out);
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// Silence the Amp for the start
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node_conf.set_param(amp_gain_param, (0.0).into());
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// Create a NodeProg from the currently created nodes:
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let mut prog = node_conf.rebuild_node_ports();
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// The order you add the nodes to the NodeProg determines
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// the order they will be executed by the audio thread.
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// You will have to take care that all nodes get their
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// data in the right order here.
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node_conf.add_prog_node(&mut prog, &NodeId::Sin(0));
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node_conf.add_prog_node(&mut prog, &NodeId::Amp(0));
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node_conf.add_prog_node(&mut prog, &NodeId::Out(0));
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// Define the connections between the nodes in the NodeProg:
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node_conf.set_prog_node_exec_connection(
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&mut prog,
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// first the input:
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(amp, amp.inp("inp").unwrap()),
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// then the output that is assigned to it:
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(sin, sin.out("sig").unwrap()),
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);
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node_conf.set_prog_node_exec_connection(
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&mut prog,
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(out, out.inp("ch1").unwrap()),
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(amp, amp.out("sig").unwrap()),
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);
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node_conf.set_prog_node_exec_connection(
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&mut prog,
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(out, out.inp("ch2").unwrap()),
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(amp, amp.out("sig").unwrap()),
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);
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// Finally upload the NodeProg to the audio thread.
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node_conf.upload_prog(prog, true);
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// You can repeatedly create new NodeProgs with `rebuild_node_ports`
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// and change the graph all the way you like at runtime.
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let mut amp_counter = 0;
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let mut pitch_counter = 0;
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loop {
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// In this loop we simulate someone adjusting the paramter
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// knobs of the amplifier gain and sine oscillator pitch.
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//
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// Please note, that for sample accurate modulation you should
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// use the built in tracker or receive MIDI data from
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// different application (MIDI processing has not been
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// implemented yet (2021-05-18) and is not implemented
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// in this jack interface).
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let new_gain = match amp_counter {
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0 => 0.2,
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1 => 0.3,
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2 => 0.35,
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3 => 0.3,
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4 => 0.1,
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_ => {
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amp_counter = 0;
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// Pitch is defined in 0.1 per octave.
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// 0.0 is A4,
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// 0.1 is A5
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// -0.1 is A3
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let new_pitch = match pitch_counter {
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0 => 0.0, // A4
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1 => -0.1, // A3
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2 => 0.1, // A5
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3 => -0.1, // A3
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4 => -0.2, // A2
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_ => {
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pitch_counter = 0;
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// -0.15 is 6 semitones above A3 => D#3
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-0.15
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}
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};
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pitch_counter += 1;
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println!("set pitch={:4.2}", new_pitch);
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node_conf.set_param(sin_freq_param, new_pitch.into());
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0.1
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}
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};
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amp_counter += 1;
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println!("set gain={:4.2}", new_gain);
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node_conf.set_param(amp_gain_param, new_gain.into());
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std::thread::sleep(std::time::Duration::from_millis(300));
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}
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});
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}
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struct Notifications {
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node_exec: Arc<Mutex<NodeExecutor>>,
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}
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impl jack::NotificationHandler for Notifications {
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fn thread_init(&self, _: &jack::Client) {
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println!("JACK: thread init");
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}
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fn shutdown(&mut self, status: jack::ClientStatus, reason: &str) {
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println!("JACK: shutdown with status {:?} because \"{}\"", status, reason);
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}
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fn freewheel(&mut self, _: &jack::Client, is_enabled: bool) {
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println!("JACK: freewheel mode is {}", if is_enabled { "on" } else { "off" });
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}
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fn sample_rate(&mut self, _: &jack::Client, srate: jack::Frames) -> jack::Control {
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println!("JACK: sample rate changed to {}", srate);
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let mut ne = self.node_exec.lock().unwrap();
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ne.set_sample_rate(srate as f32);
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jack::Control::Continue
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}
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fn client_registration(&mut self, _: &jack::Client, name: &str, is_reg: bool) {
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println!(
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"JACK: {} client with name \"{}\"",
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if is_reg { "registered" } else { "unregistered" },
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name
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);
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}
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fn port_registration(&mut self, client: &jack::Client, port_id: jack::PortId, is_reg: bool) {
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if let Some(p) = client.port_by_id(port_id) {
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if let Ok(name) = p.name() {
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println!("JACK: port registered: {}", name);
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}
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}
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println!(
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"JACK: {} port with id {}",
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if is_reg { "registered" } else { "unregistered" },
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port_id
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);
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}
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fn port_rename(
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&mut self,
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_: &jack::Client,
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port_id: jack::PortId,
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old_name: &str,
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new_name: &str,
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) -> jack::Control {
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println!("JACK: port with id {} renamed from {} to {}", port_id, old_name, new_name);
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jack::Control::Continue
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}
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fn ports_connected(
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&mut self,
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_: &jack::Client,
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port_id_a: jack::PortId,
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port_id_b: jack::PortId,
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are_connected: bool,
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) {
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println!(
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"JACK: ports with id {} and {} are {}",
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port_id_a,
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port_id_b,
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if are_connected { "connected" } else { "disconnected" }
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);
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}
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fn graph_reorder(&mut self, _: &jack::Client) -> jack::Control {
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println!("JACK: graph reordered");
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jack::Control::Continue
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}
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fn xrun(&mut self, _: &jack::Client) -> jack::Control {
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println!("JACK: xrun occurred");
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jack::Control::Continue
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}
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}
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// This function starts the Jack backend and
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// runs the audio loop with the NodeExecutor.
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fn start_backend<F: FnMut()>(node_exec: NodeExecutor, mut frontend_loop: F) {
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let (client, _status) =
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jack::Client::new("HexoDSPJackDemo", jack::ClientOptions::NO_START_SERVER).unwrap();
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let in_a = client.register_port("hexodsp_in1", jack::AudioIn::default()).unwrap();
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let in_b = client.register_port("hexodsp_in2", jack::AudioIn::default()).unwrap();
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let mut out_a = client.register_port("hexodsp_out1", jack::AudioOut::default()).unwrap();
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let mut out_b = client.register_port("hexodsp_out2", jack::AudioOut::default()).unwrap();
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let ne = Arc::new(Mutex::new(node_exec));
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let ne2 = ne.clone();
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let mut first = true;
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let process_callback = move |client: &jack::Client, ps: &jack::ProcessScope| -> jack::Control {
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let out_a_p = out_a.as_mut_slice(ps);
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let out_b_p = out_b.as_mut_slice(ps);
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let in_a_p = in_a.as_slice(ps);
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let in_b_p = in_b.as_slice(ps);
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if first {
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client
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.connect_ports_by_name("HexoDSPJackDemo:hexodsp_out1", "system:playback_1")
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.expect("jack connect ports works");
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client
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.connect_ports_by_name("HexoDSPJackDemo:hexodsp_out2", "system:playback_2")
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.expect("jack connect ports works");
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first = false;
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}
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let nframes = out_a_p.len();
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// Please note, locking the NodeExecutor is wrong and broken
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// and should not be done on a real time thread.
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//
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// We do it for educational purposes here.
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// In reality the jack::NotificationHandler should send a message through
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// a ring buffer to the audio thread and set the new sample rate or
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// other parameters there!
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let mut node_exec = ne.lock().unwrap();
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// First task in the audio callback is processing any graph or parameter
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// updates that were sent by the frontend thread:
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node_exec.process_graph_updates();
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let mut frames_left = nframes;
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let mut offs = 0;
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while frames_left > 0 {
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let cur_nframes = if frames_left >= hexodsp::dsp::MAX_BLOCK_SIZE {
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hexodsp::dsp::MAX_BLOCK_SIZE
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} else {
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frames_left
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};
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frames_left -= cur_nframes;
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let output = &mut [
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&mut out_a_p[offs..(offs + cur_nframes)],
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&mut out_b_p[offs..(offs + cur_nframes)],
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];
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let input = &[&in_a_p[offs..(offs + cur_nframes)], &in_b_p[offs..(offs + cur_nframes)]];
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let mut context = Context { nframes: cur_nframes, output, input };
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for i in 0..context.nframes {
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context.output[0][i] = 0.0;
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context.output[1][i] = 0.0;
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}
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node_exec.process(&mut context);
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offs += cur_nframes;
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}
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jack::Control::Continue
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};
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let process = jack::ClosureProcessHandler::new(process_callback);
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// Activate the client, which starts the processing.
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let active_client = client.activate_async(Notifications { node_exec: ne2 }, process).unwrap();
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frontend_loop();
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active_client.deactivate().unwrap();
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}
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