mirror of
https://github.com/ksyasuda/SubMiner.git
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sudacode
39286c2c55
- Recover authored ASS lyrics and signs across overlay, sidebar, immersion, and mining - Collapse repeated karaoke phases while preserving ordinary dialogue and positioned signs
679 lines
21 KiB
TypeScript
679 lines
21 KiB
TypeScript
import {
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assOverrideSignature,
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assToPlainText,
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collectAssOverrideCommands,
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parseAssEffectField,
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type AssEffectKind,
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type AssOverrideCommand,
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} from './ass-text';
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import { hasAssAnimationEvidence, mergeDuplicateCues } from './subtitle-cue-dedup';
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export interface SubtitleCue {
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startTime: number;
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endTime: number;
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text: string;
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/** A complete authored line recovered from matching generated ASS animation events. */
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source?: 'canonical-ass';
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/**
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* Full span of the generated animation events a canonical cue replaced. Entrance and
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* exit frames routinely run past the authored `startTime`/`endTime`, so live-text
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* matching must use this envelope while display and history keep the authored timing.
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*/
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animationStartTime?: number;
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animationEndTime?: number;
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}
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/**
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* Everything the parser knows about a source event, shared only with the dedup engine.
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* Deduplication needs the authoring context -- which style the line belongs to, which
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* override commands it carries, whether the `Effect` column was set -- to tell a karaoke
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* burst apart from two characters saying the same word in turn. None of it is meaningful
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* outside the parser, so the public API exposes only timing, text, and the optional
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* canonical-source marker used by live subtitle consumers.
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*/
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export interface AnnotatedSubtitleCue extends SubtitleCue {
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/** Text exactly as authored, override blocks and all. */
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rawText: string;
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style: string;
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layer: number;
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/** ASS `Name`/`Actor` column. */
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name: string;
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/** ASS `Effect` column, verbatim. */
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effect: string;
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effectKind: AssEffectKind;
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/** Override commands found in `{...}` blocks, with their arguments. */
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overrides: readonly AssOverrideCommand[];
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/** Canonical form of `overrides`, for spotting values that change across a run. */
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overrideSignature: string;
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/** Position in the source file, so sorting by time stays deterministic across layers. */
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order: number;
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}
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export type SubtitleSourceFormat = 'ass' | 'srt';
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const HTML_SUBTITLE_TAG_PATTERN = /<\/?[A-Za-z][^>\n]*>/g;
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const SRT_TIMING_PATTERN =
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/^\s*(?:(\d{1,2}):)?(\d{2}):(\d{2})[,.](\d{1,3})\s*-->\s*(?:(\d{1,2}):)?(\d{2}):(\d{2})[,.](\d{1,3})/;
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function parseTimestamp(
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hours: string | undefined,
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minutes: string,
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seconds: string,
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millis: string,
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): number {
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return (
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Number(hours || 0) * 3600 +
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Number(minutes) * 60 +
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Number(seconds) +
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Number(millis.padEnd(3, '0')) / 1000
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);
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}
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/**
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* The single ASS decode for the file path: cues leave the parser as plain text with real
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* line breaks, matching what mpv hands over for the same line played live. No layer
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* downstream decodes ASS again.
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*/
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function sanitizeSubtitleCueText(text: string): string {
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return assToPlainText(text, '\n').replace(HTML_SUBTITLE_TAG_PATTERN, '').trim();
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}
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function toPublicCues(cues: AnnotatedSubtitleCue[]): SubtitleCue[] {
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return cues.map(({ startTime, endTime, text, source, animationStartTime, animationEndTime }) =>
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source
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? { startTime, endTime, text, source, animationStartTime, animationEndTime }
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: { startTime, endTime, text },
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);
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}
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function parseAnnotatedSrtCues(content: string): AnnotatedSubtitleCue[] {
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const cues: AnnotatedSubtitleCue[] = [];
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const lines = content.split(/\r?\n/);
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let i = 0;
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while (i < lines.length) {
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const line = lines[i]!;
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const timingMatch = SRT_TIMING_PATTERN.exec(line);
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if (!timingMatch) {
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i += 1;
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continue;
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}
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const startTime = parseTimestamp(
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timingMatch[1],
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timingMatch[2]!,
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timingMatch[3]!,
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timingMatch[4]!,
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);
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const endTime = parseTimestamp(
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timingMatch[5],
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timingMatch[6]!,
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timingMatch[7]!,
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timingMatch[8]!,
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);
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i += 1;
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const textLines: string[] = [];
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while (i < lines.length && lines[i]!.trim() !== '') {
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textLines.push(lines[i]!);
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i += 1;
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}
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const rawText = textLines.join('\n');
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const text = sanitizeSubtitleCueText(rawText);
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if (text) {
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cues.push({
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startTime,
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endTime,
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text,
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rawText,
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style: '',
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layer: 0,
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name: '',
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effect: '',
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effectKind: 'none',
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// SRT and VTT carry no authoring metadata, and the dedup engine never reads
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// overrides for those formats -- collecting them would be parsing for nobody.
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overrides: [],
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overrideSignature: '',
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order: cues.length,
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});
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}
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}
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return cues;
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}
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export function parseSrtCues(content: string): SubtitleCue[] {
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return toPublicCues(parseAnnotatedSrtCues(content));
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}
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const ASS_TIMING_PATTERN = /^(\d+):(\d{2}):(\d{2})\.(\d{1,2})$/;
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const ASS_FORMAT_PREFIX = 'Format:';
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const ASS_DIALOGUE_PREFIX = 'Dialogue:';
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const ASS_COMMENT_PREFIX = 'Comment:';
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const ASS_NAME_FIELD_ALIASES = ['name', 'actor'];
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const CANONICAL_MATCH_MARGIN_SECONDS = 1;
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const MIN_CANONICAL_ANIMATION_EVENTS = 3;
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// A tiny animated fragment can itself be composed from still smaller glyph events. It is
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// not enough evidence that the fragment represents an authored line boundary.
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const MIN_CANONICAL_DIALOGUE_TEXT_LENGTH = 4;
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function parseAssTimestamp(raw: string): number | null {
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const match = ASS_TIMING_PATTERN.exec(raw.trim());
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if (!match) {
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return null;
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}
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const hours = Number(match[1]);
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const minutes = Number(match[2]);
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const seconds = Number(match[3]);
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const centiseconds = Number(match[4]!.padEnd(2, '0'));
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return hours * 3600 + minutes * 60 + seconds + centiseconds / 100;
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}
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function readField(fields: string[], index: number): string {
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return index >= 0 && index < fields.length ? fields[index]!.trim() : '';
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}
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function findFieldIndex(formatFields: string[], aliases: string[]): number {
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for (const alias of aliases) {
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const index = formatFields.indexOf(alias);
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if (index >= 0) {
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return index;
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}
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}
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return -1;
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}
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interface ParsedAssEvents {
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dialogue: AnnotatedSubtitleCue[];
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comments: AnnotatedSubtitleCue[];
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}
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// Every candidate line re-reads the compacted text of each event in its window, so on
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// fragment-heavy scripts the same event compacts thousands of times without this cache.
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const compactMatchTextCache = new WeakMap<AnnotatedSubtitleCue, string>();
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function compactAssMatchText(text: string): string {
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return text.replace(/\s+/gu, '');
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}
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function compactCueMatchText(cue: AnnotatedSubtitleCue): string {
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let compact = compactMatchTextCache.get(cue);
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if (compact === undefined) {
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compact = compactAssMatchText(cue.text);
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compactMatchTextCache.set(cue, compact);
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}
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return compact;
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}
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function assEventGroupKey(cue: AnnotatedSubtitleCue): string {
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return `${cue.style}\0${cue.name}`;
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}
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/**
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* Windowed lookup over one style/name group. Every candidate line queries its time
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* neighborhood, and fragment-heavy scripts put thousands of candidates in one group, so
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* a linear rescan per candidate is quadratic in practice. Events are sorted by start
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* once; `prefixMaxEnd` lets the backward walk stop as soon as no earlier event can still
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* reach the window.
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*/
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interface AssEventGroupIndex {
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byStart: AnnotatedSubtitleCue[];
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prefixMaxEnd: number[];
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}
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function buildAssEventGroupIndex(events: readonly AnnotatedSubtitleCue[]): AssEventGroupIndex {
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const byStart = [...events].sort((a, b) => a.startTime - b.startTime || a.order - b.order);
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const prefixMaxEnd: number[] = [];
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let maxEnd = -Infinity;
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for (const event of byStart) {
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maxEnd = Math.max(maxEnd, event.endTime);
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prefixMaxEnd.push(maxEnd);
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}
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return { byStart, prefixMaxEnd };
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}
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/** Group events overlapping `[startTime, endTime]`, returned in source order. */
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function eventsOverlappingWindow(
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index: AssEventGroupIndex,
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startTime: number,
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endTime: number,
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): AnnotatedSubtitleCue[] {
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const { byStart, prefixMaxEnd } = index;
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let low = 0;
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let high = byStart.length;
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while (low < high) {
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const mid = (low + high) >>> 1;
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if (byStart[mid]!.startTime <= endTime) {
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low = mid + 1;
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} else {
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high = mid;
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}
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}
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const matches: AnnotatedSubtitleCue[] = [];
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for (let i = low - 1; i >= 0 && prefixMaxEnd[i]! >= startTime; i -= 1) {
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if (byStart[i]!.endTime >= startTime) {
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matches.push(byStart[i]!);
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}
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}
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return matches.sort((a, b) => a.order - b.order);
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}
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interface FragmentGroup {
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text: string;
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events: AnnotatedSubtitleCue[];
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}
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function fragmentPlacementAnchors(event: AnnotatedSubtitleCue): Set<string> {
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const anchors = new Set<string>();
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for (const command of event.overrides) {
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const name = command.name.toLowerCase();
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const args = command.args.split(',').map((value) => value.trim());
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if (name === 'pos' && args.length >= 2) {
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anchors.add(`pos:${args[0]},${args[1]}`);
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} else if (name === 'move' && args.length >= 4) {
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anchors.add(`move:${args[0]},${args[1]}`);
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anchors.add(`move:${args[2]},${args[3]}`);
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}
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}
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return anchors;
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}
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function isRepeatedFragmentCopy(
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previous: AnnotatedSubtitleCue,
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current: AnnotatedSubtitleCue,
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): boolean {
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const previousAnchors = fragmentPlacementAnchors(previous);
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if ([...fragmentPlacementAnchors(current)].some((anchor) => previousAnchors.has(anchor))) {
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return true;
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}
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return (
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previous.startTime === current.startTime &&
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previous.endTime === current.endTime &&
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previous.overrideSignature === current.overrideSignature
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);
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}
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function groupConsecutiveAssFragments(events: readonly AnnotatedSubtitleCue[]): FragmentGroup[] {
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const groups: FragmentGroup[] = [];
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for (const event of events) {
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const text = compactCueMatchText(event);
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if (!text) {
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continue;
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}
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const previous = groups.at(-1);
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if (
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previous?.text === text &&
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previous.events.some((previousEvent) => isRepeatedFragmentCopy(previousEvent, event))
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) {
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previous.events.push(event);
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} else {
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groups.push({ text, events: [event] });
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}
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}
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return groups;
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}
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function findCanonicalFragmentEvents(
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events: readonly AnnotatedSubtitleCue[],
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canonicalText: string,
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): AnnotatedSubtitleCue[] {
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const groups = groupConsecutiveAssFragments(events);
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const matches = new Set<AnnotatedSubtitleCue>();
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for (let start = 0; start < groups.length; start += 1) {
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let combined = '';
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for (let end = start; end < groups.length; end += 1) {
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const group = groups[end]!;
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// A complete rendered copy cannot prove that the neighboring events are its
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// fragments. Exact full-line animation is handled separately for comments.
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if (group.text.length >= canonicalText.length) {
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break;
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}
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const next = combined + group.text;
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if (!canonicalText.startsWith(next)) {
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break;
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}
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combined = next;
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if (combined !== canonicalText) {
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continue;
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}
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for (let index = start; index <= end; index += 1) {
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for (const event of groups[index]!.events) {
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matches.add(event);
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}
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}
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start = end;
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break;
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}
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}
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return [...matches];
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}
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function matchingAssAnimationEvents(options: {
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candidate: AnnotatedSubtitleCue;
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group: AssEventGroupIndex;
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allowFullLineFrames: boolean;
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}): AnnotatedSubtitleCue[] {
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const canonicalText = compactCueMatchText(options.candidate);
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// The group index already restricts to the candidate's style and name.
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const nearby = eventsOverlappingWindow(
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options.group,
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options.candidate.startTime - CANONICAL_MATCH_MARGIN_SECONDS,
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options.candidate.endTime + CANONICAL_MATCH_MARGIN_SECONDS,
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);
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const fragments = findCanonicalFragmentEvents(nearby, canonicalText);
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if (fragments.length >= MIN_CANONICAL_ANIMATION_EVENTS && hasAssAnimationEvidence(fragments)) {
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return fragments;
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}
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if (!options.allowFullLineFrames) {
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return [];
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}
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const fullLineFrames = nearby.filter((cue) => compactCueMatchText(cue) === canonicalText);
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return fullLineFrames.length >= MIN_CANONICAL_ANIMATION_EVENTS &&
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hasAssAnimationEvidence(fullLineFrames)
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? fullLineFrames
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: [];
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}
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function includeCanonicalBoundaryEvents(options: {
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candidate: AnnotatedSubtitleCue;
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group: AssEventGroupIndex;
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animationEvents: readonly AnnotatedSubtitleCue[];
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}): AnnotatedSubtitleCue[] {
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const canonicalText = compactCueMatchText(options.candidate);
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const startTime = Math.min(...options.animationEvents.map((event) => event.startTime));
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const endTime = Math.max(...options.animationEvents.map((event) => event.endTime));
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return eventsOverlappingWindow(
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options.group,
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startTime - CANONICAL_MATCH_MARGIN_SECONDS,
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endTime + CANONICAL_MATCH_MARGIN_SECONDS,
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).filter((cue) => compactCueMatchText(cue) === canonicalText);
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}
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function recoverCanonicalAssEvents({
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dialogue,
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comments,
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}: ParsedAssEvents): AnnotatedSubtitleCue[] {
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const recovered: AnnotatedSubtitleCue[] = [];
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const suppressed = new Set<AnnotatedSubtitleCue>();
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// A recovery is only as good as its owning event. When a later candidate proves that
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// an earlier candidate was itself a generated frame of its animation, the earlier
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// recovery is a duplicate of the same authored line and must be withdrawn.
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const recoveredByOwner = new Map<AnnotatedSubtitleCue, AnnotatedSubtitleCue>();
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const withdrawn = new Set<AnnotatedSubtitleCue>();
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const eventsByGroup = new Map<string, AnnotatedSubtitleCue[]>();
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for (const cue of dialogue) {
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const key = assEventGroupKey(cue);
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const group = eventsByGroup.get(key);
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if (group) {
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group.push(cue);
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} else {
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eventsByGroup.set(key, [cue]);
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}
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}
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const indexByGroup = new Map<string, AssEventGroupIndex>();
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for (const [key, events] of eventsByGroup) {
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indexByGroup.set(key, buildAssEventGroupIndex(events));
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}
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const emptyGroupIndex: AssEventGroupIndex = { byStart: [], prefixMaxEnd: [] };
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const candidates = [
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...comments.map((cue) => ({ cue, kind: 'comment' as const })),
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...dialogue
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.filter(
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(cue) =>
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compactCueMatchText(cue).length >= MIN_CANONICAL_DIALOGUE_TEXT_LENGTH &&
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hasAssAnimationEvidence([cue]),
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)
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.sort((left, right) => right.text.length - left.text.length || left.order - right.order)
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.map((cue) => ({ cue, kind: 'dialogue' as const })),
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];
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for (const { cue: candidate, kind } of candidates) {
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if (candidate.endTime <= candidate.startTime || suppressed.has(candidate)) {
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continue;
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}
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const canonicalText = compactCueMatchText(candidate);
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if (!canonicalText) {
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continue;
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}
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const group = indexByGroup.get(assEventGroupKey(candidate)) ?? emptyGroupIndex;
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const animationEvents = matchingAssAnimationEvents({
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candidate,
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group,
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allowFullLineFrames: kind === 'comment',
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});
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if (animationEvents.length === 0) {
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continue;
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}
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const boundaryEvents = includeCanonicalBoundaryEvents({
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candidate,
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group,
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animationEvents,
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});
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const generatedEvents = [...new Set([...animationEvents, ...boundaryEvents])];
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const animationStartTime = Math.min(
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candidate.startTime,
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...generatedEvents.map((event) => event.startTime),
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);
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const animationEndTime = Math.max(
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candidate.endTime,
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...generatedEvents.map((event) => event.endTime),
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);
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const startTime = kind === 'comment' ? candidate.startTime : animationStartTime;
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const endTime = kind === 'comment' ? candidate.endTime : animationEndTime;
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const recoveredCue: AnnotatedSubtitleCue = {
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...candidate,
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startTime,
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endTime,
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animationStartTime,
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animationEndTime,
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source: 'canonical-ass',
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};
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recovered.push(recoveredCue);
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recoveredByOwner.set(candidate, recoveredCue);
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for (const event of generatedEvents) {
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suppressed.add(event);
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if (event === candidate) {
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continue;
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}
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const priorRecovery = recoveredByOwner.get(event);
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if (priorRecovery) {
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// No text is lost by withdrawing: a fragment claim means the withdrawn line is
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// a contiguous piece of this candidate's text, and a boundary claim means the
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// texts are equal, so the surviving canonical cue always contains it.
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withdrawn.add(priorRecovery);
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}
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}
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}
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const survivingRecovered = recovered.filter((cue) => !withdrawn.has(cue));
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if (survivingRecovered.length === 0) {
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return dialogue;
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}
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return [...dialogue.filter((cue) => !suppressed.has(cue)), ...survivingRecovered].sort(
|
|
(a, b) => a.startTime - b.startTime || a.endTime - b.endTime || a.order - b.order,
|
|
);
|
|
}
|
|
|
|
function parseAnnotatedAssEvents(content: string): ParsedAssEvents {
|
|
const cues: AnnotatedSubtitleCue[] = [];
|
|
const comments: AnnotatedSubtitleCue[] = [];
|
|
const lines = content.split(/\r?\n/);
|
|
let inEventsSection = false;
|
|
let eventOrder = 0;
|
|
const fieldIndex = {
|
|
start: -1,
|
|
end: -1,
|
|
text: -1,
|
|
style: -1,
|
|
layer: -1,
|
|
name: -1,
|
|
effect: -1,
|
|
};
|
|
|
|
const resetFieldIndex = () => {
|
|
fieldIndex.start = -1;
|
|
fieldIndex.end = -1;
|
|
fieldIndex.text = -1;
|
|
fieldIndex.style = -1;
|
|
fieldIndex.layer = -1;
|
|
fieldIndex.name = -1;
|
|
fieldIndex.effect = -1;
|
|
};
|
|
|
|
for (const line of lines) {
|
|
const trimmed = line.trim();
|
|
|
|
if (trimmed.startsWith('[') && trimmed.endsWith(']')) {
|
|
inEventsSection = trimmed.toLowerCase() === '[events]';
|
|
if (!inEventsSection) {
|
|
resetFieldIndex();
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (!inEventsSection) {
|
|
continue;
|
|
}
|
|
|
|
if (trimmed.startsWith(ASS_FORMAT_PREFIX)) {
|
|
const formatFields = trimmed
|
|
.slice(ASS_FORMAT_PREFIX.length)
|
|
.split(',')
|
|
.map((field) => field.trim().toLowerCase());
|
|
fieldIndex.start = formatFields.indexOf('start');
|
|
fieldIndex.end = formatFields.indexOf('end');
|
|
fieldIndex.text = formatFields.indexOf('text');
|
|
fieldIndex.style = formatFields.indexOf('style');
|
|
fieldIndex.layer = formatFields.indexOf('layer');
|
|
// Aegisub writes the speaker column as `Actor`; the v4+ spec calls it `Name`.
|
|
// Missing it costs the burst check its speaker guard, so both spellings count.
|
|
fieldIndex.name = findFieldIndex(formatFields, ASS_NAME_FIELD_ALIASES);
|
|
fieldIndex.effect = formatFields.indexOf('effect');
|
|
continue;
|
|
}
|
|
|
|
const eventPrefix = trimmed.startsWith(ASS_DIALOGUE_PREFIX)
|
|
? ASS_DIALOGUE_PREFIX
|
|
: trimmed.startsWith(ASS_COMMENT_PREFIX)
|
|
? ASS_COMMENT_PREFIX
|
|
: null;
|
|
if (!eventPrefix) {
|
|
continue;
|
|
}
|
|
|
|
if (fieldIndex.start < 0 || fieldIndex.end < 0 || fieldIndex.text < 0) {
|
|
continue;
|
|
}
|
|
|
|
const fields = trimmed.slice(eventPrefix.length).split(',');
|
|
if (
|
|
fieldIndex.start >= fields.length ||
|
|
fieldIndex.end >= fields.length ||
|
|
fieldIndex.text >= fields.length
|
|
) {
|
|
continue;
|
|
}
|
|
|
|
const startTime = parseAssTimestamp(fields[fieldIndex.start]!);
|
|
const endTime = parseAssTimestamp(fields[fieldIndex.end]!);
|
|
if (startTime === null || endTime === null) {
|
|
continue;
|
|
}
|
|
|
|
const rawText = fields.slice(fieldIndex.text).join(',');
|
|
const text = sanitizeSubtitleCueText(rawText);
|
|
if (!text) {
|
|
continue;
|
|
}
|
|
|
|
const effect = readField(fields, fieldIndex.effect);
|
|
const layer = Number(readField(fields, fieldIndex.layer));
|
|
const overrides = collectAssOverrideCommands(rawText);
|
|
const cue: AnnotatedSubtitleCue = {
|
|
startTime,
|
|
endTime,
|
|
text,
|
|
rawText,
|
|
style: readField(fields, fieldIndex.style),
|
|
layer: Number.isFinite(layer) ? layer : 0,
|
|
name: readField(fields, fieldIndex.name),
|
|
effect,
|
|
effectKind: parseAssEffectField(effect),
|
|
overrides,
|
|
overrideSignature: assOverrideSignature(overrides),
|
|
order: eventOrder,
|
|
};
|
|
eventOrder += 1;
|
|
if (eventPrefix === ASS_COMMENT_PREFIX) {
|
|
comments.push(cue);
|
|
} else {
|
|
cues.push(cue);
|
|
}
|
|
}
|
|
|
|
return { dialogue: cues, comments };
|
|
}
|
|
|
|
function parseAnnotatedAssCues(content: string): AnnotatedSubtitleCue[] {
|
|
return recoverCanonicalAssEvents(parseAnnotatedAssEvents(content));
|
|
}
|
|
|
|
export function parseAssCues(content: string): SubtitleCue[] {
|
|
return toPublicCues(parseAnnotatedAssCues(content));
|
|
}
|
|
|
|
function detectSubtitleFormat(source: string): 'srt' | 'vtt' | 'ass' | 'ssa' | null {
|
|
const [normalizedSource = source] =
|
|
(() => {
|
|
try {
|
|
return /^[a-z]+:\/\//i.test(source) ? new URL(source).pathname : source;
|
|
} catch {
|
|
return source;
|
|
}
|
|
})().split(/[?#]/, 1)[0] ?? '';
|
|
const ext = normalizedSource.split('.').pop()?.toLowerCase() ?? '';
|
|
if (ext === 'srt') return 'srt';
|
|
if (ext === 'vtt') return 'vtt';
|
|
if (ext === 'ass' || ext === 'ssa') return 'ass';
|
|
return null;
|
|
}
|
|
|
|
export function parseSubtitleCues(content: string, filename: string): SubtitleCue[] {
|
|
const format = detectSubtitleFormat(filename);
|
|
let cues: AnnotatedSubtitleCue[];
|
|
let sourceFormat: SubtitleSourceFormat = 'srt';
|
|
|
|
switch (format) {
|
|
case 'srt':
|
|
case 'vtt':
|
|
cues = parseAnnotatedSrtCues(content);
|
|
break;
|
|
case 'ass':
|
|
case 'ssa':
|
|
cues = parseAnnotatedAssCues(content);
|
|
sourceFormat = 'ass';
|
|
break;
|
|
default:
|
|
cues = [];
|
|
}
|
|
|
|
if (cues.length === 0) {
|
|
const assCues = parseAnnotatedAssCues(content);
|
|
const srtCues = parseAnnotatedSrtCues(content);
|
|
const preferAss = assCues.length >= srtCues.length;
|
|
cues = preferAss ? assCues : srtCues;
|
|
sourceFormat = preferAss && assCues.length > 0 ? 'ass' : 'srt';
|
|
}
|
|
|
|
cues.sort((a, b) => a.startTime - b.startTime || a.endTime - b.endTime || a.order - b.order);
|
|
return toPublicCues(mergeDuplicateCues(cues, sourceFormat));
|
|
}
|