jellyfin/MediaBrowser.MediaEncoding/Subtitles/AssParser.cs
2020-06-16 16:11:30 +12:00

128 lines
5.1 KiB
C#

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