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video: ass subtitle format (WIP)

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This commit is contained in:
Thibault Deckers 2021-06-23 12:58:10 +09:00
parent e8050a78df
commit c495f113fa
1 changed files with 53 additions and 13 deletions
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66
lib/widgets/viewer/visual/subtitle/ass_parser.dart
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@ -4,7 +4,11 @@ import 'package:aves/widgets/viewer/visual/subtitle/style.dart';
import 'package:flutter/material.dart';
class AssParser {
static final tagPattern = RegExp(r'\*?('
// the optional `*` before the tags seems to be used for inner overrides
// but specs for its usage are yet to be found
static final overridePattern = RegExp(r'{\*?(.*?)}');
static final tagPattern = RegExp(r'('
r'1a|2a|3a|4a'
r'|1c|2c|3c|4c'
r'|alpha|an|a'
@ -47,10 +51,10 @@ class AssParser {
var extraStyle = const SubtitleStyle();
var textStyle = baseStyle;
var i = 0;
final matches = RegExp(r'{(.*?)}').allMatches(text);
matches.forEach((m) {
if (i != m.start) {
final spanText = extraStyle.drawingPaths?.isNotEmpty == true ? null : _replaceChars(text.substring(i, m.start));
final overrideMatches = overridePattern.allMatches(text);
overrideMatches.forEach((overrideMatch) {
if (i != overrideMatch.start) {
final spanText = extraStyle.drawingPaths?.isNotEmpty == true ? null : _replaceChars(text.substring(i, overrideMatch.start));
spans.add(StyledSubtitleSpan(
textSpan: TextSpan(
text: spanText,
@ -59,8 +63,8 @@ class AssParser {
extraStyle: extraStyle,
));
}
i = m.end;
final tags = m.group(1);
i = overrideMatch.end;
final tags = overrideMatch.group(1);
tags?.split('\\').where((v) => v.isNotEmpty).forEach((tagWithParam) {
final tag = tagPattern.firstMatch(tagWithParam)?.group(1);
if (tag != null) {
@ -80,6 +84,39 @@ class AssParser {
blurRadius: v.blurRadius,
))
.toList());
extraStyle = extraStyle.copyWith(
borderColor: extraStyle.borderColor?.withAlpha(a),
);
}
break;
}
case '1a':
{
// \1a: fill alpha
final a = _parseAlpha(param);
if (a != null) textStyle = textStyle.copyWith(color: textStyle.color?.withAlpha(a));
break;
}
case '3a':
{
// \3a: border alpha
final a = _parseAlpha(param);
if (a != null) extraStyle = extraStyle.copyWith(borderColor: extraStyle.borderColor?.withAlpha(a));
break;
}
case '4a':
{
// \4a: shadow alpha
final a = _parseAlpha(param);
if (a != null) {
textStyle = textStyle.copyWith(
shadows: textStyle.shadows
?.map((v) => Shadow(
color: v.color.withAlpha(a),
offset: v.offset,
blurRadius: v.blurRadius,
))
.toList());
}
break;
}
@ -163,13 +200,19 @@ class AssParser {
case 'fax':
{
final factor = double.tryParse(param);
if (factor != null) extraStyle = extraStyle.copyWith(shearX: factor);
// ignore subsequent shearing when line is positioned
if (factor != null && (line.position == null || extraStyle.shearX == null)) {
extraStyle = extraStyle.copyWith(shearX: factor);
}
break;
}
case 'fay':
{
final factor = double.tryParse(param);
if (factor != null) extraStyle = extraStyle.copyWith(shearY: factor);
// ignore subsequent shearing when line is positioned
if (factor != null && (line.position == null || extraStyle.shearY == null)) {
extraStyle = extraStyle.copyWith(shearY: factor);
}
break;
}
case 'fn':
@ -239,7 +282,7 @@ class AssParser {
final scale = int.tryParse(param);
if (scale != null) {
if (scale > 0) {
final start = m.end;
final start = overrideMatch.end;
final end = text.indexOf('{', start);
final commands = text.substring(start, end == -1 ? null : end);
extraStyle = extraStyle.copyWith(drawingPaths: _parsePaths(commands, scale));
@ -281,9 +324,6 @@ class AssParser {
textStyle = textStyle.copyWith(decoration: param == '1' ? TextDecoration.underline : TextDecoration.none);
break;
// TODO TLAD [subtitles] SHOULD support the following
case '1a':
case '3a':
case '4a':
case 'shad':
case 't': // \t: animated transform
case 'xshad':