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use scene::{
BaseTimelineElement, Element, ElementRef, ParamValue, ParamValues, RetimeConfig, SceneTracks,
Track, VideoElement,
};
use time::MediaTime;
use timeline::split::{RetainSide, split_elements};
fn seconds(value: f64) -> MediaTime {
MediaTime::from_seconds_f64(value).unwrap()
}
fn build_video_element(id: &str, duration: MediaTime, retime: Option<RetimeConfig>) -> Element {
Element::Video(VideoElement {
base: BaseTimelineElement {
id: id.to_string(),
name: id.to_string(),
start_time: MediaTime::ZERO,
duration,
trim_start: MediaTime::ZERO,
trim_end: MediaTime::ZERO,
source_duration: None,
animations: None,
params: ParamValues::from([
("transform.positionX".to_string(), ParamValue::Number(0.0)),
("transform.positionY".to_string(), ParamValue::Number(0.0)),
("transform.scaleX".to_string(), ParamValue::Number(1.0)),
("transform.scaleY".to_string(), ParamValue::Number(1.0)),
("transform.rotate".to_string(), ParamValue::Number(0.0)),
("opacity".to_string(), ParamValue::Number(1.0)),
]),
},
media_id: format!("media-{id}"),
is_source_audio_enabled: None,
hidden: None,
retime,
effects: None,
masks: None,
})
}
fn seed_tracks(element: Element) -> (SceneTracks, ElementRef) {
let reference = ElementRef {
track_id: "main-track".to_string(),
element_id: element.base().id.clone(),
};
(
SceneTracks {
overlay: Vec::new(),
main: Track::Video {
id: "main-track".to_string(),
name: "Main Track".to_string(),
elements: vec![element],
muted: false,
hidden: false,
},
audio: Vec::new(),
},
reference,
)
}
#[test]
fn split_produces_left_and_right_halves_with_shifted_trims() {
let (tracks, reference) = seed_tracks(build_video_element("video-1", seconds(10.0), None));
let result = split_elements(&tracks, &[reference], seconds(4.0), RetainSide::Both);
assert_eq!(result.right_side_elements.len(), 1);
let elements = result.tracks.main.elements();
assert_eq!(elements.len(), 2);
let left = &elements[0];
assert_eq!(left.base().id, "video-1");
assert_eq!(left.base().name, "video-1 (left)");
assert_eq!(left.base().start_time, MediaTime::ZERO);
assert_eq!(left.base().duration, seconds(4.0));
assert_eq!(left.base().trim_start, MediaTime::ZERO);
assert_eq!(left.base().trim_end, seconds(6.0));
let right = &elements[1];
assert_eq!(right.base().id, result.right_side_elements[0].element_id);
assert_eq!(right.base().name, "video-1 (right)");
assert_eq!(right.base().start_time, seconds(4.0));
assert_eq!(right.base().duration, seconds(6.0));
assert_eq!(right.base().trim_start, seconds(4.0));
assert_eq!(right.base().trim_end, MediaTime::ZERO);
}
#[test]
fn split_scales_source_spans_by_the_retime_rate() {
let retime = RetimeConfig {
rate: 2.0,
maintain_pitch: None,
};
let (tracks, reference) =
seed_tracks(build_video_element("video-1", seconds(10.0), Some(retime)));
let result = split_elements(&tracks, &[reference], seconds(4.0), RetainSide::Both);
let elements = result.tracks.main.elements();
let left = &elements[0];
let right = &elements[1];
assert_eq!(left.base().trim_end, seconds(12.0));
assert_eq!(right.base().trim_start, seconds(8.0));
assert_eq!(
left.base().trim_start + left.base().duration * 2 + left.base().trim_end,
right.base().trim_start + right.base().duration * 2 + right.base().trim_end
);
assert_eq!(timeline::element_retime(left), Some(retime));
assert_eq!(timeline::element_retime(right), Some(retime));
}
#[test]
fn retain_left_keeps_only_the_left_half() {
let (tracks, reference) = seed_tracks(build_video_element("video-1", seconds(10.0), None));
let result = split_elements(&tracks, &[reference], seconds(4.0), RetainSide::Left);
assert_eq!(result.right_side_elements.len(), 0);
let elements = result.tracks.main.elements();
assert_eq!(elements.len(), 1);
assert_eq!(elements[0].base().id, "video-1");
assert_eq!(elements[0].base().duration, seconds(4.0));
assert_eq!(elements[0].base().trim_end, seconds(6.0));
}
#[test]
fn retain_right_keeps_only_the_right_half_with_a_new_id() {
let (tracks, reference) = seed_tracks(build_video_element("video-1", seconds(10.0), None));
let result = split_elements(&tracks, &[reference], seconds(4.0), RetainSide::Right);
assert_eq!(result.right_side_elements.len(), 1);
let elements = result.tracks.main.elements();
assert_eq!(elements.len(), 1);
let right = &elements[0];
assert_ne!(right.base().id, "video-1");
assert_eq!(right.base().id, result.right_side_elements[0].element_id);
assert_eq!(right.base().start_time, seconds(4.0));
assert_eq!(right.base().duration, seconds(6.0));
assert_eq!(right.base().trim_start, seconds(4.0));
}
#[test]
fn split_outside_the_element_bounds_is_a_no_op() {
let (tracks, reference) = seed_tracks(build_video_element("video-1", seconds(10.0), None));
for split_time in [MediaTime::ZERO, seconds(10.0), seconds(12.0)] {
let result = split_elements(
&tracks,
std::slice::from_ref(&reference),
split_time,
RetainSide::Both,
);
assert_eq!(result.right_side_elements.len(), 0);
assert_eq!(result.tracks.main.elements().len(), 1);
assert_eq!(
result.tracks.main.elements()[0].base().duration,
seconds(10.0)
);
}
}
#[test]
fn shifting_the_right_side_and_inserting_into_the_gap_keeps_layout_consistent() {
let (tracks, reference) = seed_tracks(build_video_element("video-1", seconds(10.0), None));
let result = split_elements(&tracks, &[reference], seconds(4.0), RetainSide::Both);
let right_ref = result.right_side_elements[0].clone();
let shifted = timeline::update_element_in_scene_tracks(
&result.tracks,
&right_ref.track_id,
&right_ref.element_id,
|element| {
let mut next = element.clone();
next.base_mut().start_time = element.base().start_time + seconds(3.0);
next
},
None,
);
let elements = shifted.main.elements();
assert_eq!(elements[0].base().duration, seconds(4.0));
assert_eq!(elements[1].base().start_time, seconds(7.0));
assert_eq!(elements[1].base().duration, seconds(6.0));
}
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