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Rework subtitle selection to reduce code clutter

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pull/6446/head
Roel van Uden 3 years ago
parent 95988ce33d
commit b830d38a34
1 changed files with 15 additions and 34 deletions
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49
Emby.Server.Implementations/Library/MediaStreamSelector.cs
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@ -38,14 +38,11 @@ namespace Emby.Server.Implementations.Library
}
public static int? GetDefaultSubtitleStreamIndex(
List<MediaStream> streams,
IEnumerable<MediaStream> streams,
string[] preferredLanguages,
SubtitlePlaybackMode mode,
string audioTrackLanguage)
{
streams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages)
.ToList();
MediaStream stream = null;
if (mode == SubtitlePlaybackMode.None)
@ -53,62 +50,46 @@ namespace Emby.Server.Implementations.Library
return null;
}
var sortedStreams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages)
.OrderByDescending(x => x.IsExternal)
.ThenByDescending(x => x.IsForced && string.Equals(x.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
.ThenByDescending(x => x.IsForced)
.ThenByDescending(x => x.IsDefault)
.ToList();
if (mode == SubtitlePlaybackMode.Default)
{
// Prefer embedded metadata over smart logic
stream = streams.FirstOrDefault(s => s.IsExternal && s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsExternal && s.IsForced) ??
streams.FirstOrDefault(s => s.IsExternal && s.IsDefault) ??
streams.FirstOrDefault(s => s.IsExternal) ??
streams.FirstOrDefault(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsForced) ??
streams.FirstOrDefault(s => s.IsDefault);
stream = sortedStreams.FirstOrDefault(s => s.IsExternal || s.IsForced || s.IsDefault);
// if the audio language is not understood by the user, load their preferred subs, if there are any
if (stream == null && !preferredLanguages.Contains(audioTrackLanguage, StringComparer.OrdinalIgnoreCase))
{
stream = streams.FirstOrDefault(s => !s.IsForced && preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase));
stream = sortedStreams.FirstOrDefault(s => !s.IsForced && preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase));
}
}
else if (mode == SubtitlePlaybackMode.Smart)
{
// Prefer smart logic over embedded metadata
// if the audio language is not understood by the user, load their preferred subs, if there are any
if (!preferredLanguages.Contains(audioTrackLanguage, StringComparer.OrdinalIgnoreCase))
{
stream = streams.FirstOrDefault(s => s.IsExternal && !s.IsForced && preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsExternal && preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => !s.IsForced && preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase));
stream = sortedStreams.FirstOrDefault(s => preferredLanguages.Contains(s.Language, StringComparer.OrdinalIgnoreCase));
}
}
else if (mode == SubtitlePlaybackMode.Always)
{
// always load the most suitable full subtitles
stream = streams.FirstOrDefault(s => s.IsExternal && !s.IsForced) ??
streams.FirstOrDefault(s => !s.IsForced);
stream = sortedStreams.FirstOrDefault(s => !s.IsForced);
}
else if (mode == SubtitlePlaybackMode.OnlyForced)
{
// always load the most suitable full subtitles
stream = streams.FirstOrDefault(s => s.IsExternal && s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsExternal && s.IsForced) ??
streams.FirstOrDefault(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsForced);
stream = sortedStreams.FirstOrDefault(x => x.IsForced);
}
// load forced subs if we have found no suitable full subtitles
stream ??= streams.FirstOrDefault(s => s.IsExternal && s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase)) ??
streams.FirstOrDefault(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase));
if (stream != null)
{
return stream.Index;
}
return null;
stream ??= sortedStreams.FirstOrDefault(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase));
return stream?.Index;
}
private static IEnumerable<MediaStream> GetSortedStreams(IEnumerable<MediaStream> streams, MediaStreamType type, string[] languagePreferences)

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