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feat: make subtitleeditparser generic
Authored-by: Claus Vium <cvium@users.noreply.github.com>
Merged-by: Bond-009 <bond.009@outlook.com>
Original-merge: 7323ccfc23
120 lines
4.5 KiB
C#
120 lines
4.5 KiB
C#
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.Reflection;
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using Jellyfin.Extensions;
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using MediaBrowser.Model.MediaInfo;
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using Microsoft.Extensions.Logging;
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using Nikse.SubtitleEdit.Core.Common;
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using Nikse.SubtitleEdit.Core.SubtitleFormats;
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using SubtitleFormat = Nikse.SubtitleEdit.Core.SubtitleFormats.SubtitleFormat;
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namespace MediaBrowser.MediaEncoding.Subtitles
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{
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/// <summary>
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/// SubStation Alpha subtitle parser.
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/// </summary>
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public class SubtitleEditParser : ISubtitleParser
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{
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private readonly ILogger<SubtitleEditParser> _logger;
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private readonly Dictionary<string, SubtitleFormat[]> _subtitleFormats;
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/// <summary>
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/// Initializes a new instance of the <see cref="SubtitleEditParser"/> class.
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/// </summary>
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/// <param name="logger">The logger.</param>
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public SubtitleEditParser(ILogger<SubtitleEditParser> logger)
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{
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_logger = logger;
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_subtitleFormats = GetSubtitleFormats()
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.Where(subtitleFormat => !string.IsNullOrEmpty(subtitleFormat.Extension))
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.GroupBy(subtitleFormat => subtitleFormat.Extension.TrimStart('.'), StringComparer.OrdinalIgnoreCase)
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.ToDictionary(g => g.Key, g => g.ToArray(), StringComparer.OrdinalIgnoreCase);
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}
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/// <inheritdoc />
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public SubtitleTrackInfo Parse(Stream stream, string fileExtension)
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{
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var subtitle = new Subtitle();
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var lines = stream.ReadAllLines().ToList();
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if (!_subtitleFormats.TryGetValue(fileExtension, out var subtitleFormats))
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{
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throw new ArgumentException($"Unsupported file extension: {fileExtension}", nameof(fileExtension));
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}
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foreach (var subtitleFormat in subtitleFormats)
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{
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_logger.LogDebug(
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"Trying to parse '{FileExtension}' subtitle using the {SubtitleFormatParser} format parser",
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fileExtension,
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subtitleFormat.Name);
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subtitleFormat.LoadSubtitle(subtitle, lines, fileExtension);
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if (subtitleFormat.ErrorCount == 0)
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{
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break;
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}
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_logger.LogError(
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"{ErrorCount} errors encountered while parsing '{FileExtension}' subtitle using the {SubtitleFormatParser} format parser",
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subtitleFormat.ErrorCount,
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fileExtension,
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subtitleFormat.Name);
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}
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if (subtitle.Paragraphs.Count == 0)
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{
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throw new ArgumentException("Unsupported format: " + fileExtension);
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}
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var trackInfo = new SubtitleTrackInfo();
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int len = subtitle.Paragraphs.Count;
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var trackEvents = new SubtitleTrackEvent[len];
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for (int i = 0; i < len; i++)
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{
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var p = subtitle.Paragraphs[i];
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trackEvents[i] = new SubtitleTrackEvent(p.Number.ToString(CultureInfo.InvariantCulture), p.Text)
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{
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StartPositionTicks = p.StartTime.TimeSpan.Ticks,
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EndPositionTicks = p.EndTime.TimeSpan.Ticks
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};
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}
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trackInfo.TrackEvents = trackEvents;
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return trackInfo;
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}
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/// <inheritdoc />
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public bool SupportsFileExtension(string fileExtension)
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=> _subtitleFormats.ContainsKey(fileExtension);
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private IEnumerable<SubtitleFormat> GetSubtitleFormats()
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{
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var subtitleFormats = new List<SubtitleFormat>();
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var assembly = typeof(SubtitleFormat).Assembly;
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foreach (var type in assembly.GetTypes())
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{
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if (!type.IsSubclassOf(typeof(SubtitleFormat)) || type.IsAbstract)
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{
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continue;
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}
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try
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{
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// It shouldn't be null, but the exception is caught if it is
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var subtitleFormat = (SubtitleFormat)Activator.CreateInstance(type, true)!;
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subtitleFormats.Add(subtitleFormat);
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}
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catch (Exception ex)
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{
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_logger.LogWarning(ex, "Failed to create instance of the subtitle format {SubtitleFormatType}", type.Name);
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}
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}
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return subtitleFormats;
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}
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}
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}
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