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follow vlc foreground reads after seeks

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dirtydishes 2026-05-26 00:40:23 -04:00
parent 365dfb22f9
commit 0f3101ce5c
5 changed files with 239 additions and 3 deletions
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34
Dreamio/ProgressiveHTTPRangeCache.swift
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@ -376,6 +376,7 @@ final class ProgressiveHTTPRangeCacheSession {
#if DEBUG
print("[DreamioRangeCache] cache=hit range=\(bounded.start)-\(bounded.end)")
#endif
prefetchAheadIfForegroundMoved(to: bounded)
return data
}
@ -386,8 +387,13 @@ final class ProgressiveHTTPRangeCacheSession {
#endif
cancelPrefetchIfNeeded(forForegroundRange: bounded)
for missingRange in missingRanges {
let data = try await fetcher.fetch(range: missingRange)
store.insert(data: data, at: missingRange.start)
for fetchRange in alignedChunks(covering: missingRange) where !store.hasData(for: fetchRange) {
let data = try await fetcher.fetch(range: fetchRange)
store.insert(data: data, at: fetchRange.start)
#if DEBUG
print("[DreamioRangeCache] foreground fetched range=\(fetchRange.start)-\(fetchRange.end) bytes=\(data.count)")
#endif
}
}
prefetch(aroundByteOffset: bounded.end + 1, forceRestart: true)
return store.data(for: bounded) ?? Data()
@ -500,6 +506,18 @@ final class ProgressiveHTTPRangeCacheSession {
cancelPrefetch()
}
private func prefetchAheadIfForegroundMoved(to range: HTTPByteRange) {
guard activePrefetchWindow?.contains(range.start) == true,
let preferredOffset = activePrefetchPreferredOffset,
abs(range.start - preferredOffset) >= responseChunkSize else {
return
}
#if DEBUG
print("[DreamioRangeCache] prefetch follow-foreground from=\(preferredOffset) to=\(range.end + 1)")
#endif
prefetch(aroundByteOffset: range.end + 1, forceRestart: true)
}
private func targetWindow(aroundByteOffset offset: Int64) -> HTTPByteRange {
targetWindow(aroundByteOffset: offset, minimumBehind: prefetchChunkSize)
}
@ -539,6 +557,18 @@ final class ProgressiveHTTPRangeCacheSession {
return chunks
}
func alignedChunks(covering range: HTTPByteRange) -> [HTTPByteRange] {
let bounded = clamp(range)
var chunks: [HTTPByteRange] = []
var cursor = alignedChunkStart(for: bounded.start)
while cursor <= bounded.end {
let chunk = HTTPByteRange(start: cursor, end: min(contentLength - 1, cursor + prefetchChunkSize - 1))
chunks.append(chunk)
cursor = chunk.end + 1
}
return chunks
}
private func evictOverBudget(protecting range: HTTPByteRange) {
let headerRange = HTTPByteRange(start: 0, end: min(contentLength - 1, prefetchChunkSize - 1))
let tailStart = max(0, contentLength - (4 * prefetchChunkSize))