audio_graph

DAG-based audio processing graph for DAW applications in Rust. Connects instruments, effects and buses with typed ports and automatic topological scheduling.

Features

• Typed ports — Audio, MIDI and Control ports per node, validated at connection time
• DAG scheduling — Kahn's algorithm computes the correct processing order automatically
• Parallel groups — independent nodes are grouped for concurrent execution (rayon-ready)
• Cycle detection — connecting nodes that would create a feedback loop returns an error
• Dynamic graph — add and remove nodes and connections at runtime
• Lock-free routing — buffer routing between nodes uses no allocations per block

Usage

use audio_graph::{AudioGraph, Node, ProcessContext};
use audio_graph::port::{Port, PortType};
use audio_graph::port::PortId;

struct MySynth;

impl Node for MySynth {
    fn ports(&self) -> Vec<Port> {
        vec![
            Port::midi_in(0, "midi_in"),
            Port::audio_out(0, "out_l"),
            Port::audio_out(1, "out_r"),
        ]
    }

    fn process(&mut self, ctx: &mut ProcessContext) {
        // read MIDI, write audio
    }
}

let mut graph = AudioGraph::new(44100.0, 512);

let synth = graph.add_node(Box::new(MySynth));
let filter = graph.add_node(Box::new(MyFilter));

graph.connect(synth, PortId(0), filter, PortId(0), PortType::Audio)?;

graph.process_block(); // executes in correct topological order

Signal types

Part of the DAW crate ecosystem

audio_core_dsp
midi_clock_sync
audio_graph      ← you are here
event_queue
mixer
piano_roll
plugin_host
project_io

License

MIT