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use std::collections::HashSet;
use scene::{Element, ElementAnimations, ParamValues, RetimeConfig, SceneTracks};
use time::MediaTime;
use crate::retime::{
clamp_retime_rate, get_source_span_at_clip_time, get_timeline_duration_for_source_span,
round_media_time,
};
#[derive(Clone, Debug, Default)]
pub struct ElementPatch {
pub name: Option<String>,
pub duration: Option<MediaTime>,
pub start_time: Option<MediaTime>,
pub trim_start: Option<MediaTime>,
pub trim_end: Option<MediaTime>,
pub source_duration: Option<Option<MediaTime>>,
pub animations: Option<Option<ElementAnimations>>,
pub params: Option<ParamValues>,
pub retime: Option<Option<RetimeConfig>>,
}
pub struct ElementUpdateContext<'a> {
pub tracks: &'a SceneTracks,
pub track_id: &'a str,
}
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash)]
enum UpdateField {
Retime,
Duration,
StartTime,
}
pub fn apply_element_update(
element: &Element,
patch: &ElementPatch,
context: &ElementUpdateContext,
) -> Element {
let mut next_element = merge_patch(element, patch);
let mut changed_fields: HashSet<UpdateField> = HashSet::new();
if patch.retime.is_some() {
changed_fields.insert(UpdateField::Retime);
}
if patch.duration.is_some() {
changed_fields.insert(UpdateField::Duration);
}
if patch.start_time.is_some() {
changed_fields.insert(UpdateField::StartTime);
}
if changed_fields.contains(&UpdateField::Retime)
&& let Some(patch_retime) = &patch.retime
&& crate::is_retimable_element(&next_element)
{
let next_retime = patch_retime.map(|retime| RetimeConfig {
rate: clamp_retime_rate(retime.rate),
maintain_pitch: retime.maintain_pitch,
});
let source_duration = get_source_duration(element);
let visible_source_span = (source_duration
- next_element.base().trim_start.as_ticks() as f64
- next_element.base().trim_end.as_ticks() as f64)
.max(0.0);
let next_duration = round_media_time(get_timeline_duration_for_source_span(
visible_source_span,
next_retime.as_ref(),
));
crate::set_element_retime(&mut next_element, next_retime);
next_element.base_mut().duration = next_duration;
changed_fields.insert(UpdateField::Duration);
}
if changed_fields.contains(&UpdateField::Duration) {
next_element.base_mut().animations = animation::clamp_animations_to_duration(
next_element.base().animations.as_ref(),
next_element.base().duration,
);
}
if changed_fields.contains(&UpdateField::StartTime) {
let requested_start_time = next_element.base().start_time.max(MediaTime::ZERO);
if context.track_id != context.tracks.main.id() {
next_element.base_mut().start_time = requested_start_time;
} else {
let earliest = context
.tracks
.main
.elements()
.iter()
.filter(|candidate| candidate.base().id != next_element.base().id)
.reduce(|earliest, candidate| {
if candidate.base().start_time < earliest.base().start_time {
candidate
} else {
earliest
}
});
next_element.base_mut().start_time = match earliest {
Some(earliest) if requested_start_time > earliest.base().start_time => {
requested_start_time
}
_ => MediaTime::ZERO,
};
}
}
next_element
}
fn merge_patch(element: &Element, patch: &ElementPatch) -> Element {
let mut next = element.clone();
let base = next.base_mut();
if let Some(name) = &patch.name {
base.name = name.clone();
}
if let Some(duration) = patch.duration {
base.duration = duration;
}
if let Some(start_time) = patch.start_time {
base.start_time = start_time;
}
if let Some(trim_start) = patch.trim_start {
base.trim_start = trim_start;
}
if let Some(trim_end) = patch.trim_end {
base.trim_end = trim_end;
}
if let Some(source_duration) = patch.source_duration {
base.source_duration = source_duration;
}
if let Some(animations) = &patch.animations {
base.animations = animations.clone();
}
if let Some(params) = &patch.params {
base.params.extend(params.clone());
}
if let Some(retime) = &patch.retime {
crate::set_element_retime(&mut next, *retime);
}
next
}
fn get_source_duration(element: &Element) -> f64 {
let base = element.base();
if let Some(source_duration) = base.source_duration {
return source_duration.as_ticks() as f64;
}
let retime = crate::element_retime(element);
base.trim_start.as_ticks() as f64
+ get_source_span_at_clip_time(base.duration.as_ticks() as f64, retime.as_ref())
+ base.trim_end.as_ticks() as f64
}
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