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fix(streaming): keep subtitle tokenization prefetch warm for full episodes (#183)

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This commit is contained in:
Kyle Yasuda
2026-08-03 21:22:18 -07:00
committed by GitHub
parent bffb1c5982
commit b08cd0db35
15 changed files with 231 additions and 59 deletions
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src/core/services/subtitle-processing-controller.ts
+13 -5
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@@ -5,8 +5,17 @@ export interface SubtitleProcessingControllerDeps {
emitSubtitle: (payload: SubtitleData) => void;
logDebug?: (message: string) => void;
now?: () => number;
cacheLimit?: number;
}
/**
* Pure memory bound on the LRU, not a coverage limit: prefetching runs to the end of a
* file regardless of cache pressure. Sized to hold a feature-length title (a 24-minute
* episode runs 300-400 lines, a 2-hour film ~2000) plus room for lines that repeat across
* episodes of a series, so openings and endings stay warm between titles.
*/
export const DEFAULT_SUBTITLE_TOKENIZATION_CACHE_LIMIT = 2500;
export interface SubtitleProcessingController {
onSubtitleChange: (text: string) => void;
refreshCurrentSubtitle: (textOverride?: string) => void;
@@ -14,7 +23,6 @@ export interface SubtitleProcessingController {
preCacheTokenization: (text: string, data: SubtitleData) => void;
consumeCachedSubtitle: (text: string) => SubtitleData | null;
hasCachedSubtitle: (text: string) => boolean;
isCacheFull: () => boolean;
}
export function normalizeSubtitleCacheKey(text: string): string {
@@ -24,7 +32,10 @@ export function normalizeSubtitleCacheKey(text: string): string {
export function createSubtitleProcessingController(
deps: SubtitleProcessingControllerDeps,
): SubtitleProcessingController {
const SUBTITLE_TOKENIZATION_CACHE_LIMIT = 256;
const SUBTITLE_TOKENIZATION_CACHE_LIMIT =
deps.cacheLimit && deps.cacheLimit > 0
? deps.cacheLimit
: DEFAULT_SUBTITLE_TOKENIZATION_CACHE_LIMIT;
let latestText = '';
let lastEmittedText = '';
let cacheGeneration = 0;
@@ -174,8 +185,5 @@ export function createSubtitleProcessingController(
hasCachedSubtitle: (text: string) => {
return tokenizationCache.has(normalizeSubtitleCacheKey(text));
},
isCacheFull: () => {
return tokenizationCache.size >= SUBTITLE_TOKENIZATION_CACHE_LIMIT;
},
};
}