sim-lib-audio-dsp 0.1.3

Reusable pure Rust DSP processors for the SIM audio graph.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

//! Deterministic cookbook builders for audio-DSP recipes.

use sim_kernel::{Expr, NumberLiteral, Symbol};

use crate::DspConfigDescriptor;

/// Build the modeled offline DSP chain descriptor used by the cookbook recipe.
pub fn offline_chain_demo() -> Expr {
    Expr::Map(vec![
        (field("kind"), sym("audio-dsp", "offline-chain")),
        (
            field("processors"),
            Expr::Vector(vec![
                DspConfigDescriptor::gain(0.75)
                    .expect("valid gain config")
                    .as_expr()
                    .clone(),
                config("delay", "time-ms", 125.0),
                config("filter", "cutoff-hz", 1_200.0),
                config("compressor", "threshold-db", -18.0),
            ]),
        ),
        (field("fixture"), sym("audio-dsp", "offline-fixture")),
    ])
}

/// Build the deterministic audio-processing trace used by the 30-agent recipe.
pub fn audio_processing_trace_demo() -> Expr {
    list(vec![
        sym_plain("audio-processing-trace"),
        list(vec![sym_plain("id"), sym_plain("a30-020-audio-processing")]),
        list(vec![
            sym_plain("fixture"),
            list(vec![sym_plain("source"), sym_plain("synthetic-waveform")]),
            list(vec![sym_plain("media"), sym_plain("copied-no")]),
            list(vec![sym_plain("sample-rate"), number(48000)]),
            list(vec![sym_plain("duration-ms"), number(250)]),
        ]),
        list(vec![
            sym_plain("synthesis"),
            list(vec![sym_plain("component"), sym_plain("sine-hz-440")]),
            list(vec![
                sym_plain("component"),
                sym_plain("noise-floor-minus-48db"),
            ]),
            list(vec![sym_plain("window"), sym_plain("hann")]),
        ]),
        list(vec![
            sym_plain("features"),
            list(vec![sym_plain("rms-percent"), number(42)]),
            list(vec![
                sym_plain("spectrum"),
                list(vec![sym_plain("peak-hz"), number(440)]),
                list(vec![sym_plain("centroid-hz"), number(560)]),
                list(vec![
                    sym_plain("band-energy"),
                    sym_plain("low-18"),
                    sym_plain("mid-71"),
                    sym_plain("high-11"),
                ]),
            ]),
        ]),
        list(vec![
            sym_plain("fake-asr"),
            list(vec![sym_plain("runner"), sym_plain("fake-asr")]),
            list(vec![sym_plain("transcript"), sym_plain("steady-test-tone")]),
            list(vec![
                sym_plain("segment"),
                number(0),
                number(250),
                sym_plain("steady-test-tone"),
            ]),
        ]),
        list(vec![
            sym_plain("prosody"),
            list(vec![sym_plain("loudness"), sym_plain("moderate")]),
            list(vec![sym_plain("pitch"), sym_plain("stable")]),
            list(vec![sym_plain("pace"), sym_plain("even")]),
        ]),
        list(vec![
            sym_plain("answer"),
            sym_plain("steady-tone-with-moderate-loudness"),
        ]),
        list(vec![
            sym_plain("effect-ledger"),
            effect("synth-fixture", "local"),
            effect("compute-rms", "pass"),
            effect("compute-spectrum", "pass"),
            effect("fake-asr-transcript", "deterministic"),
        ]),
    ])
}

fn config(kind: &str, key: &str, value: f64) -> Expr {
    DspConfigDescriptor::new(kind, vec![(key.to_owned(), value)])
        .expect("valid cookbook DSP config")
        .as_expr()
        .clone()
}

fn effect(action: &str, result: &str) -> Expr {
    list(vec![
        sym_plain("effect"),
        sym_plain(action),
        sym_plain(result),
    ])
}

fn field(name: &str) -> Expr {
    Expr::Symbol(Symbol::qualified("audio-dsp", name))
}

fn sym(namespace: &str, name: &str) -> Expr {
    Expr::Symbol(Symbol::qualified(namespace, name))
}

fn sym_plain(name: &str) -> Expr {
    Expr::Symbol(Symbol::new(name))
}

fn number(value: impl ToString) -> Expr {
    Expr::Number(NumberLiteral {
        domain: Symbol::qualified("numbers", "i64"),
        canonical: value.to_string(),
    })
}

fn list(items: Vec<Expr>) -> Expr {
    Expr::List(items)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn offline_chain_demo_contains_four_processors() {
        let Expr::Map(entries) = offline_chain_demo() else {
            panic!("offline chain demo is a map")
        };
        assert!(matches!(
            entries.iter().find(|(key, _)| matches!(key, Expr::Symbol(symbol) if symbol.name.as_ref() == "processors")),
            Some((_, Expr::Vector(items))) if items.len() == 4
        ));
    }
}