129 lines
5.0 KiB
C#
129 lines
5.0 KiB
C#
#pragma warning disable CS1591
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Text.RegularExpressions;
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using System.Threading;
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using MediaBrowser.Model.MediaInfo;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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public class AssParser : ISubtitleParser
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{
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private readonly CultureInfo _usCulture = new CultureInfo("en-US");
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/// <inheritdoc />
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public SubtitleTrackInfo Parse(Stream stream, CancellationToken cancellationToken)
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{
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var trackInfo = new SubtitleTrackInfo();
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var trackEvents = new List<SubtitleTrackEvent>();
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var eventIndex = 1;
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using (var reader = new StreamReader(stream))
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{
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string line;
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while (reader.ReadLine() != "[Events]")
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{
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}
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var headers = ParseFieldHeaders(reader.ReadLine());
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while ((line = reader.ReadLine()) != null)
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{
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cancellationToken.ThrowIfCancellationRequested();
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if (string.IsNullOrWhiteSpace(line))
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{
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continue;
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}
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if (line[0] == '[')
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{
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break;
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}
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var subEvent = new SubtitleTrackEvent { Id = eventIndex.ToString(_usCulture) };
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eventIndex++;
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var sections = line.Substring(10).Split(',');
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subEvent.StartPositionTicks = GetTicks(sections[headers["Start"]]);
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subEvent.EndPositionTicks = GetTicks(sections[headers["End"]]);
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subEvent.Text = string.Join(",", sections.Skip(headers["Text"]));
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RemoteNativeFormatting(subEvent);
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subEvent.Text = subEvent.Text.Replace("\\n", ParserValues.NewLine, StringComparison.OrdinalIgnoreCase);
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subEvent.Text = Regex.Replace(subEvent.Text, @"\{(\\[\w]+\(?([\w\d]+,?)+\)?)+\}", string.Empty, RegexOptions.IgnoreCase);
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trackEvents.Add(subEvent);
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}
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}
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trackInfo.TrackEvents = trackEvents.ToArray();
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return trackInfo;
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}
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private long GetTicks(ReadOnlySpan<char> time)
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{
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return TimeSpan.TryParseExact(time, @"h\:mm\:ss\.ff", _usCulture, out var span)
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? span.Ticks : 0;
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}
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private Dictionary<string, int> ParseFieldHeaders(string line)
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{
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var fields = line.Substring(8).Split(',').Select(x => x.Trim()).ToList();
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return new Dictionary<string, int>
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{
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{ "Start", fields.IndexOf("Start") },
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{ "End", fields.IndexOf("End") },
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{ "Text", fields.IndexOf("Text") }
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};
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}
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private void RemoteNativeFormatting(SubtitleTrackEvent p)
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{
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int indexOfBegin = p.Text.IndexOf('{', StringComparison.Ordinal);
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string pre = string.Empty;
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while (indexOfBegin >= 0 && p.Text.IndexOf('}', StringComparison.Ordinal) > indexOfBegin)
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{
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string s = p.Text.Substring(indexOfBegin);
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if (s.StartsWith("{\\an1}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an2}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an3}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an4}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an5}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an6}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an7}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an8}", StringComparison.Ordinal) ||
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s.StartsWith("{\\an9}", StringComparison.Ordinal))
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{
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pre = s.Substring(0, 6);
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}
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else if (s.StartsWith("{\\an1\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an2\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an3\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an4\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an5\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an6\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an7\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an8\\", StringComparison.Ordinal) ||
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s.StartsWith("{\\an9\\", StringComparison.Ordinal))
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{
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pre = s.Substring(0, 5) + "}";
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}
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int indexOfEnd = p.Text.IndexOf('}', StringComparison.Ordinal);
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p.Text = p.Text.Remove(indexOfBegin, (indexOfEnd - indexOfBegin) + 1);
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indexOfBegin = p.Text.IndexOf('{', StringComparison.Ordinal);
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}
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p.Text = pre + p.Text;
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}
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}
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}
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