use crate::fixtures::{Now, graph_of, next};
use sva_ast::{Graph, PerBar};
use sva_engine::{
Extent, Outcome, Range, RenderConfig, Stream, StreamConfig, Tier, identity, render,
};
const RATE: u32 = 44_100;
fn once(evaluated: &[Extent]) -> Option<Extent> {
let mut held = evaluated.to_vec();
held.sort_by_key(|e| e.start);
let mut end = held.first()?.start;
for e in &held {
if e.start != end {
return None;
}
end = e.end;
}
Some(Extent::new(held[0].start, end))
}
fn at_tempo(name: &str, files: &[(&str, &str)], seconds_per_bar: f64) -> Graph {
let mut g = graph_of(name, files);
g.resolve_bar_spans(PerBar {
seconds: seconds_per_bar,
per: 1.0,
});
g
}
#[test]
fn a_note_read_at_three_placements_is_computed_once_at_either_tempo() {
let note = "crop(sin(2*pi*440*t)*exp(0 - t/0.2), 0s, 1b)\n";
for bpm in [120.0, 128.0] {
let bar = 4.0 * 60.0 / bpm;
let len = (bar * f64::from(RATE)).ceil() as i64;
let fast = bpm == 128.0;
for (song, reads, moved) in [
(
"@n(t) + @n(t - 4b) + @n(t - 4.1b)\n",
3,
if fast { 0.25 } else { 0.0 },
),
(
"@n(t - 3ms) + @n(t - 3b)\n",
2,
if fast { 0.5 } else { 0.3 },
),
] {
let g = at_tempo("placement", &[("n", note), ("song", song)], bar);
let held =
render(&g, "song", RenderConfig::at(RATE), &Tier::default()).expect("a song");
let n = held.id("n").expect("the note");
let computed = held.evaluated(n);
assert_eq!(
once(&computed),
Some(Extent::new(0, len)),
"{bpm}: {song}: {computed:?}"
);
let said = held.labels[&held.root].moved.expect("samples computed");
assert!(
(said * f64::from(RATE) - moved).abs() < 1e-9,
"{bpm}: {song}: {said}"
);
let stats = held.cache_stats.expect("what the render asked");
let asked: Vec<Outcome> = stats
.lookups
.iter()
.filter(|l| l.node == "n" && l.store.is_none())
.map(|l| l.outcome)
.collect();
assert_eq!(asked.len(), reads, "{bpm}: one lookup per read: {asked:?}");
assert!(asked[1..].iter().all(|o| *o == Outcome::Hit), "{asked:?}");
}
}
}
#[test]
fn a_crop_prunes_what_it_reads_before_it_is_computed() {
let g = graph_of(
"pruned",
&[
("long", "exp(0 - t/60)*sin(2*pi*220*t)\n"),
("cut", "crop(@long(t), 0s, 1s)\n"),
],
);
let held = render(&g, "cut", RenderConfig::at(RATE), &Tier::default()).expect("a crop");
let long = held.id("long").expect("the decay");
let computed = held.evaluated(long);
assert_eq!(
once(&computed),
Some(Extent::new(0, i64::from(RATE))),
"{computed:?}"
);
}
fn streamed(
g: &Graph,
target: &str,
rate: u32,
seconds: i64,
each: &mut dyn FnMut(i64, &[f64]),
) -> Stream {
let config = StreamConfig {
block: 1 << 15,
channels: None,
render: RenderConfig {
range: Range {
start: Some(0),
end: Some(seconds * i64::from(rate)),
},
..RenderConfig::at(rate)
},
};
let at = sva_ast::parse_expr(target).expect("a target");
let mut stream = Stream::open(g, &at, config, &Tier::default())
.now()
.expect("it streams");
while let Some(block) = next(&mut stream).expect("a block") {
each(block.start(), block.plane(0));
}
stream
}
#[test]
fn a_periodic_value_over_three_minutes_computes_one_period() {
let g = graph_of("periodic", &[("lfo", "sin(2*pi*0.25*t)\n")]);
let stream = streamed(&g, "@lfo", RATE, 180, &mut |_, _| {});
let computed = stream.evaluated("lfo");
assert_eq!(
once(&computed),
Some(Extent::new(0, 176_400)),
"{computed:?}"
);
}
#[test]
fn every_onset_lands_within_half_a_sample_and_the_tempo_never_drifts() {
let rate = 22_050;
let beat = 60.0 / 128.0;
let bars: Vec<(String, String)> = (0..24)
.map(|bar| {
let clicks: Vec<String> = (0..16)
.map(|k| format!("@click(t - {}b)", 16 * bar + k))
.collect();
(format!("bar{bar}"), format!("{}\n", clicks.join(" + ")))
})
.collect();
let song: Vec<String> = bars.iter().map(|(name, _)| format!("@{name}")).collect();
let song = format!("{}\n", song.join(" + "));
let mut files: Vec<(&str, &str)> = vec![("click", "crop(1, 0s, 1sp)\n"), ("song", &song)];
files.extend(
bars.iter()
.map(|(name, body)| (name.as_str(), body.as_str())),
);
let g = at_tempo("snapped", &files, beat);
let mut onsets = Vec::new();
streamed(&g, "@song", rate, 180, &mut |start, plane| {
onsets.extend(
plane
.iter()
.enumerate()
.filter(|(_, v)| **v != 0.0)
.map(|(i, v)| (start + i as i64, *v)),
);
});
assert_eq!(onsets.len(), 384);
for (k, (at, v)) in onsets.iter().enumerate() {
let exact = k as f64 * beat * f64::from(rate);
assert_eq!(*v, 1.0, "beat {k}");
assert!(
(*at as f64 - exact).abs() <= 0.5,
"beat {k}: {at} for {exact}"
);
let even = exact.round_ties_even() as i64;
assert_eq!(*at, even, "beat {k}: ties round to even");
}
}
#[test]
fn no_identity_or_body_holds_a_reads_shift() {
let files: [(&str, &str); 3] = [
("n", "crop(sin(2*pi*440*t), 0s, 0.5s)\n"),
("near", "@n(t - 3ms)\n"),
("far", "@n(t - 3b)\n"),
];
let g = at_tempo("placed", &files, 2.0);
let of = |root: &str| {
let typing = sva_engine::types(&g, root).expect("a law");
let n = typing.id("n").expect("the note");
let sva_engine::Value::ClosedForm(form) = typing.value(n) else {
panic!("a law");
};
assert!(
!format!("{:?}", form.body).contains("Shift"),
"{root}: n's body holds no shift"
);
identity(&typing, n).expect("an identity")
};
assert_eq!(of("near"), of("far"), "one identity wherever it is read");
}