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//! In-place timeline layout update for [`SceneRunner`].
//!
//! Split out of `runner.rs` to keep that file within the size limit.
use std::time::Duration;
use crate::error::PreviewError;
use super::runner::SceneRunner;
use super::types::Scene;
impl SceneRunner {
/// Update clip positions in place from a new [`Scene`] without stopping the
/// runner or replacing audio infrastructure.
///
/// Only the position metadata (`timeline_start`, `timeline_end`,
/// `in_point`, `out_point`, `xfade_dur`) of existing `ClipState` and
/// `AudioOnlyTrack` objects is changed. The `AudioMixer` and all
/// `AudioTrackHandle`s are reused unchanged; only the decode positions are
/// updated by calling `seek_timeline(resume_pts)` at the end.
///
/// Returns an error when the new scene is structurally incompatible with the
/// running runner (different V1 clip count or different source paths). In
/// that case the runner's state is untouched.
#[allow(clippy::too_many_lines)]
pub(super) fn update_layout_in_place(
&mut self,
scene: &Scene,
resume_pts: Duration,
) -> Result<(), PreviewError> {
let v_tracks = &scene.video_tracks;
// ── Validate V1 ────────────────────────────────────────────────────────
let new_v1_len = v_tracks.first().map_or(0, |t| t.placements.len());
if new_v1_len != self.clips.len() {
return Err(PreviewError::Ffmpeg {
code: -1,
message: format!(
"V1 clip count mismatch: runner={} timeline={new_v1_len}",
self.clips.len()
),
});
}
for (i, p) in v_tracks[0].placements.iter().enumerate() {
if p.source != self.clips[i].source {
return Err(PreviewError::Ffmpeg {
code: -1,
message: format!(
"V1 clip[{i}] source mismatch: runner={} timeline={}",
self.clips[i].source.display(),
p.source.display(),
),
});
}
}
// ── Update V1 clip positions ───────────────────────────────────────────
for (i, p) in v_tracks[0].placements.iter().enumerate() {
let new_speed = p.speed;
let old_scaled_dur = self.clips[i]
.timeline_end
.saturating_sub(self.clips[i].timeline_start);
// Recover unscaled (source) duration from the stored scaled duration and old speed.
let old_unscaled = old_scaled_dur.mul_f64(self.clips[i].speed);
// `in_point` is pre-resolved in the Scene, so this equals the old
// `match (in_point, out_point)` (the `_` arm reused `old_unscaled`).
let new_unscaled = p
.out_point
.map_or(old_unscaled, |op| op.saturating_sub(p.in_point));
let new_dur = if (new_speed - 1.0).abs() < 1e-9 {
new_unscaled
} else {
new_unscaled.div_f64(new_speed)
};
self.clips[i].timeline_start = p.offset;
self.clips[i].timeline_end = p.offset + new_dur;
self.clips[i].in_point = p.in_point;
self.clips[i].out_point = p.out_point;
self.clips[i].speed = new_speed;
self.clips[i].xfade_dur = p.xfade_dur;
self.clips[i].xfade_kind = p.xfade_kind;
}
// ── Update overlay layers (V2+) ────────────────────────────────────────
let new_overlay_count = v_tracks.len().saturating_sub(1);
if new_overlay_count == self.overlay_layers.len() {
for (layer_i, v_track) in v_tracks.iter().skip(1).enumerate() {
let layer = &mut self.overlay_layers[layer_i];
if v_track.placements.len() == layer.clips.len() {
for (j, p) in v_track.placements.iter().enumerate() {
let old_dur = layer.clips[j]
.timeline_end
.saturating_sub(layer.clips[j].timeline_start);
let new_dur = p
.out_point
.map_or(old_dur, |op| op.saturating_sub(p.in_point));
layer.clips[j].timeline_start = p.offset;
layer.clips[j].timeline_end = p.offset + new_dur;
layer.clips[j].in_point = p.in_point;
layer.clips[j].out_point = p.out_point;
}
}
}
}
// ── Update audio-only tracks (A1+) ─────────────────────────────────────
// Collect new (timeline_start, in_point, out_point) from the scene's audio
// tracks, matched positionally. Mismatched counts are skipped rather than
// returning an error because audio tracks are optional.
let new_a_positions: Vec<(Duration, Duration, Option<Duration>)> = scene
.audio_tracks
.iter()
.flat_map(|track| track.placements.iter())
.map(|p| (p.offset, p.in_point, p.out_point))
.collect();
if new_a_positions.len() == self.audio_only_tracks.len() {
for (i, (new_tl_start, new_in, new_out)) in new_a_positions.iter().enumerate() {
let old_dur = self.audio_only_tracks[i]
.timeline_end
.saturating_sub(self.audio_only_tracks[i].timeline_start);
let new_dur = if let Some(op) = new_out {
op.saturating_sub(*new_in)
} else {
old_dur
};
self.audio_only_tracks[i].timeline_start = *new_tl_start;
self.audio_only_tracks[i].timeline_end = *new_tl_start + new_dur;
self.audio_only_tracks[i].in_point = *new_in;
}
}
// ── Seek everything to resume_pts ──────────────────────────────────────
// seek_timeline invalidates all mixer buffers, stops audio-only threads,
// and repositions the active clip's DecodeBuffer to the correct
// source-file PTS. Audio-only threads restart on the next frame tick
// based on the updated timeline_start/timeline_end values.
self.seek_timeline(resume_pts)?;
Ok(())
}
}