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159 lines
6.9 KiB
C#
159 lines
6.9 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.Linq;
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using Jellyfin.Data.Enums;
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using Jellyfin.Extensions;
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using MediaBrowser.Model.Entities;
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namespace Emby.Server.Implementations.Library
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{
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public static class MediaStreamSelector
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{
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public static int? GetDefaultAudioStreamIndex(IReadOnlyList<MediaStream> streams, IReadOnlyList<string> preferredLanguages, bool preferDefaultTrack)
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{
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var sortedStreams = GetSortedStreams(streams, MediaStreamType.Audio, preferredLanguages).ToList();
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if (preferDefaultTrack)
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{
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var defaultStream = sortedStreams.FirstOrDefault(i => i.IsDefault);
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if (defaultStream is not null)
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{
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return defaultStream.Index;
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}
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}
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return sortedStreams.FirstOrDefault()?.Index;
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}
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public static int? GetDefaultSubtitleStreamIndex(
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IEnumerable<MediaStream> streams,
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IReadOnlyList<string> preferredLanguages,
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SubtitlePlaybackMode mode,
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string audioTrackLanguage)
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{
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if (mode == SubtitlePlaybackMode.None)
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{
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return null;
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}
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var sortedStreams = streams
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.Where(i => i.Type == MediaStreamType.Subtitle)
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.OrderByDescending(x => x.IsExternal)
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.ThenByDescending(x => x.IsForced && string.Equals(x.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
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.ThenByDescending(x => x.IsForced)
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.ThenByDescending(x => x.IsDefault)
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.ThenByDescending(x => preferredLanguages.Contains(x.Language, StringComparison.OrdinalIgnoreCase))
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.ToList();
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MediaStream? stream = null;
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if (mode == SubtitlePlaybackMode.Default)
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{
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// Load subtitles according to external, forced and default flags.
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stream = sortedStreams.FirstOrDefault(x => x.IsExternal || x.IsForced || x.IsDefault);
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}
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else if (mode == SubtitlePlaybackMode.Smart)
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{
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// Only attempt to load subtitles if the audio language is not one of the user's preferred subtitle languages.
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// If no subtitles of preferred language available, use default behaviour.
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if (!preferredLanguages.Contains(audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
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{
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stream = sortedStreams.FirstOrDefault(x => preferredLanguages.Contains(x.Language, StringComparison.OrdinalIgnoreCase)) ??
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sortedStreams.FirstOrDefault(x => x.IsExternal || x.IsForced || x.IsDefault);
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}
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else
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{
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// Respect forced flag.
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stream = sortedStreams.FirstOrDefault(x => x.IsForced);
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}
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}
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else if (mode == SubtitlePlaybackMode.Always)
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{
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// Always load (full/non-forced) subtitles of the user's preferred subtitle language if possible, otherwise default behaviour.
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stream = sortedStreams.FirstOrDefault(x => !x.IsForced && preferredLanguages.Contains(x.Language, StringComparison.OrdinalIgnoreCase)) ??
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sortedStreams.FirstOrDefault(x => x.IsExternal || x.IsForced || x.IsDefault);
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}
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else if (mode == SubtitlePlaybackMode.OnlyForced)
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{
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// Only load subtitles that are flagged forced.
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stream = sortedStreams.FirstOrDefault(x => x.IsForced);
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}
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return stream?.Index;
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}
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private static IEnumerable<MediaStream> GetSortedStreams(IEnumerable<MediaStream> streams, MediaStreamType type, IReadOnlyList<string> languagePreferences)
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{
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// Give some preference to external text subs for better performance
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return streams
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.Where(i => i.Type == type)
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.OrderByDescending(i => GetStreamScore(i, languagePreferences));
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}
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public static void SetSubtitleStreamScores(
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IReadOnlyList<MediaStream> streams,
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IReadOnlyList<string> preferredLanguages,
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SubtitlePlaybackMode mode,
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string audioTrackLanguage)
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{
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if (mode == SubtitlePlaybackMode.None)
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{
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return;
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}
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var sortedStreams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages).ToList();
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List<MediaStream>? filteredStreams = null;
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if (mode == SubtitlePlaybackMode.Default)
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{
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// Prefer embedded metadata over smart logic
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filteredStreams = sortedStreams.Where(s => s.IsForced || s.IsDefault)
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.ToList();
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}
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else if (mode == SubtitlePlaybackMode.Smart)
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{
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// Prefer smart logic over embedded metadata
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if (!preferredLanguages.Contains(audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
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{
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filteredStreams = sortedStreams.Where(s => !s.IsForced && preferredLanguages.Contains(s.Language, StringComparison.OrdinalIgnoreCase))
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.ToList();
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}
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}
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else if (mode == SubtitlePlaybackMode.Always)
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{
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// always load the most suitable full subtitles
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filteredStreams = sortedStreams.Where(s => !s.IsForced).ToList();
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}
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else if (mode == SubtitlePlaybackMode.OnlyForced)
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{
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// always load the most suitable full subtitles
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filteredStreams = sortedStreams.Where(s => s.IsForced).ToList();
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}
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// load forced subs if we have found no suitable full subtitles
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var iterStreams = filteredStreams is null || filteredStreams.Count == 0
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? sortedStreams.Where(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase))
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: filteredStreams;
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foreach (var stream in iterStreams)
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{
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stream.Score = GetStreamScore(stream, preferredLanguages);
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}
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}
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internal static int GetStreamScore(MediaStream stream, IReadOnlyList<string> languagePreferences)
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{
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var index = languagePreferences.FindIndex(x => string.Equals(x, stream.Language, StringComparison.OrdinalIgnoreCase));
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var score = index == -1 ? 1 : 101 - index;
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score = (score * 10) + (stream.IsForced ? 2 : 1);
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score = (score * 10) + (stream.IsDefault ? 2 : 1);
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score = (score * 10) + (stream.SupportsExternalStream ? 2 : 1);
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score = (score * 10) + (stream.IsTextSubtitleStream ? 2 : 1);
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score = (score * 10) + (stream.IsExternal ? 2 : 1);
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return score;
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}
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}
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}
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