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using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Entities;
using System;
using System.Collections.Generic;
using System.Linq;
namespace MediaBrowser.Controller.MediaEncoding
{
public static class MediaStreamSelector
{
public static int? GetDefaultAudioStreamIndex(List<MediaStream> streams, IEnumerable<string> preferredLanguages, bool preferDefaultTrack)
{
streams = GetSortedStreams(streams, MediaStreamType.Audio, preferredLanguages.ToList())
.ToList();
if (preferDefaultTrack)
{
var defaultStream = streams.FirstOrDefault(i => i.IsDefault);
if (defaultStream != null)
{
return defaultStream.Index;
}
}
var stream = streams.FirstOrDefault();
if (stream != null)
{
return stream.Index;
}
return null;
}
public static int? GetDefaultSubtitleStreamIndex(List<MediaStream> streams,
List<string> preferredLanguages,
SubtitlePlaybackMode mode,
string audioTrackLanguage)
{
streams = GetSortedStreams(streams, MediaStreamType.Subtitle, preferredLanguages)
.ToList();
var full = streams.Where(s => !s.IsForced);
MediaStream stream = null;
if (mode == SubtitlePlaybackMode.None)
{
return null;
}
if (mode == SubtitlePlaybackMode.Default)
{
// if the audio language is not understood by the user, load their preferred subs, if there are any
if (!ContainsOrdinal(preferredLanguages, audioTrackLanguage))
{
stream = full.FirstOrDefault(s => ContainsOrdinal(preferredLanguages, s.Language));
}
}
else if (mode == SubtitlePlaybackMode.Always)
{
// always load the most suitable full subtitles
stream = full.FirstOrDefault();
}
// load forced subs if we have found no suitable full subtitles
stream = stream ?? streams.FirstOrDefault(s => s.IsForced && string.Equals(s.Language, audioTrackLanguage, StringComparison.OrdinalIgnoreCase));
if (stream != null)
{
return stream.Index;
}
return null;
}
private static bool ContainsOrdinal(IEnumerable<string> list, string item)
{
return list.Any(i => string.Equals(i, item, StringComparison.OrdinalIgnoreCase));
}
private static IEnumerable<MediaStream> GetSortedStreams(IEnumerable<MediaStream> streams, MediaStreamType type, List<string> languagePreferences)
{
// Give some preferance to external text subs for better performance
return streams.Where(i => i.Type == type)
.OrderBy(i =>
{
var index = languagePreferences.FindIndex(l => string.Equals(i.Language, l, StringComparison.OrdinalIgnoreCase));
return index == -1 ? 100 : index;
})
.ThenBy(i => GetBooleanOrderBy(i.IsDefault))
.ThenBy(i => GetBooleanOrderBy(i.SupportsExternalStream))
.ThenBy(i => GetBooleanOrderBy(i.IsTextSubtitleStream))
.ThenBy(i => GetBooleanOrderBy(i.IsExternal))
.ThenBy(i => i.Index);
}
private static int GetBooleanOrderBy(bool value)
{
return value ? 0 : 1;
}
}
}
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