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[web] Improve the search of verse in the lyrics

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This commit is contained in:
Alain Nussbaumer 2023-11-28 17:55:16 +01:00
parent 3577d0e2a8
commit d627033141
1 changed files with 27 additions and 9 deletions
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36
web-src/src/components/LyricsPane.vue
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@ -52,30 +52,48 @@ export default {
},
verse_index() {
if (this.lyrics.length && this.lyrics[0].time) {
const curTime = this.player.item_progress_ms / 1000,
const currentTime = this.player.item_progress_ms / 1000,
la = this.lyrics,
trackChanged = this.player.item_id !== this.lastItemId,
trackSeeked =
this.lastIndex >= 0 &&
this.lastIndex < la.length &&
la[this.lastIndex].time > curTime
la[this.lastIndex].time > currentTime
// Reset the cache when the track has changed or has been seeked
if (trackChanged || trackSeeked) {
// Reset the cache when the track has changed or has been rewind
this.reset_scrolling()
}
// Check the cached value to avoid searching the times
// Check the next two items and the last one before searching
if (
this.lastIndex < la.length - 1 &&
la[this.lastIndex + 1].time > curTime
(this.lastIndex < la.length - 1 &&
la[this.lastIndex + 1].time > currentTime) ||
this.lastIndex === la.length - 1
)
return this.lastIndex
if (
this.lastIndex < la.length - 2 &&
la[this.lastIndex + 2].time > curTime
la[this.lastIndex + 2].time > currentTime
)
return this.lastIndex + 1
// Not found in the next 2 items, so start searching for the best time
return la.findLastIndex((verse) => verse.time <= curTime)
// Not found, then start a binary search
let start = 0,
end = la.length - 1,
index
while (start <= end) {
index = (start + end) >> 1
const currentVerse = la[index]
const nextVerse = la[index + 1]
if (
currentVerse.time <= currentTime &&
(nextVerse?.time > currentTime || !nextVerse)
) {
return index
}
currentVerse.time < currentTime
? (start = index + 1)
: (end = index - 1)
}
return -1
} else {
this.reset_scrolling()
return -1