using MediaBrowser.Model.Dto; using MediaBrowser.Model.Entities; using MediaBrowser.Model.Extensions; using MediaBrowser.Model.MediaInfo; using MediaBrowser.Model.Session; using System; using System.Collections.Generic; namespace MediaBrowser.Model.Dlna { public class StreamBuilder { private readonly ILocalPlayer _localPlayer; public StreamBuilder(ILocalPlayer localPlayer) { _localPlayer = localPlayer; } public StreamBuilder() : this(new NullLocalPlayer()) { } public StreamInfo BuildAudioItem(AudioOptions options) { ValidateAudioInput(options); List mediaSources = new List(); foreach (MediaSourceInfo i in options.MediaSources) { if (string.IsNullOrEmpty(options.MediaSourceId) || StringHelper.EqualsIgnoreCase(i.Id, options.MediaSourceId)) { mediaSources.Add(i); } } List streams = new List(); foreach (MediaSourceInfo i in mediaSources) { StreamInfo streamInfo = BuildAudioItem(i, options); if (streamInfo != null) { streams.Add(streamInfo); } } foreach (StreamInfo stream in streams) { stream.DeviceId = options.DeviceId; stream.DeviceProfileId = options.Profile.Id; } return GetOptimalStream(streams); } public StreamInfo BuildVideoItem(VideoOptions options) { ValidateInput(options); List mediaSources = new List(); foreach (MediaSourceInfo i in options.MediaSources) { if (string.IsNullOrEmpty(options.MediaSourceId) || StringHelper.EqualsIgnoreCase(i.Id, options.MediaSourceId)) { mediaSources.Add(i); } } List streams = new List(); foreach (MediaSourceInfo i in mediaSources) { StreamInfo streamInfo = BuildVideoItem(i, options); if (streamInfo != null) { streams.Add(streamInfo); } } foreach (StreamInfo stream in streams) { stream.DeviceId = options.DeviceId; stream.DeviceProfileId = options.Profile.Id; } return GetOptimalStream(streams); } private StreamInfo GetOptimalStream(List streams) { streams = StreamInfoSorter.SortMediaSources(streams); foreach (StreamInfo stream in streams) { return stream; } return null; } private StreamInfo BuildAudioItem(MediaSourceInfo item, AudioOptions options) { StreamInfo playlistItem = new StreamInfo { ItemId = options.ItemId, MediaType = DlnaProfileType.Audio, MediaSource = item, RunTimeTicks = item.RunTimeTicks, Context = options.Context, DeviceProfile = options.Profile }; MediaStream audioStream = item.GetDefaultAudioStream(null); List directPlayMethods = GetAudioDirectPlayMethods(item, audioStream, options); if (directPlayMethods.Count > 0) { string audioCodec = audioStream == null ? null : audioStream.Codec; // Make sure audio codec profiles are satisfied if (!string.IsNullOrEmpty(audioCodec)) { ConditionProcessor conditionProcessor = new ConditionProcessor(); List conditions = new List(); foreach (CodecProfile i in options.Profile.CodecProfiles) { if (i.Type == CodecType.Audio && i.ContainsCodec(audioCodec)) { foreach (ProfileCondition c in i.Conditions) { conditions.Add(c); } } } int? audioChannels = audioStream.Channels; int? audioBitrate = audioStream.BitRate; bool all = true; foreach (ProfileCondition c in conditions) { if (!conditionProcessor.IsAudioConditionSatisfied(c, audioChannels, audioBitrate)) { all = false; break; } } if (all) { if (item.Protocol == MediaProtocol.File && directPlayMethods.Contains(PlayMethod.DirectPlay) && _localPlayer.CanAccessFile(item.Path)) { playlistItem.PlayMethod = PlayMethod.DirectPlay; } else if (item.Protocol == MediaProtocol.Http && directPlayMethods.Contains(PlayMethod.DirectPlay) && _localPlayer.CanAccessUrl(item.Path, item.RequiredHttpHeaders.Count > 0)) { playlistItem.PlayMethod = PlayMethod.DirectPlay; } else if (directPlayMethods.Contains(PlayMethod.DirectStream)) { playlistItem.PlayMethod = PlayMethod.DirectStream; } playlistItem.Container = item.Container; return playlistItem; } } } TranscodingProfile transcodingProfile = null; foreach (TranscodingProfile i in options.Profile.TranscodingProfiles) { if (i.Type == playlistItem.MediaType && i.Context == options.Context) { transcodingProfile = i; break; } } if (transcodingProfile != null) { if (!item.SupportsTranscoding) { return null; } playlistItem.PlayMethod = PlayMethod.Transcode; playlistItem.TranscodeSeekInfo = transcodingProfile.TranscodeSeekInfo; playlistItem.EstimateContentLength = transcodingProfile.EstimateContentLength; playlistItem.Container = transcodingProfile.Container; playlistItem.AudioCodec = transcodingProfile.AudioCodec; playlistItem.SubProtocol = transcodingProfile.Protocol; List audioCodecProfiles = new List(); foreach (CodecProfile i in options.Profile.CodecProfiles) { if (i.Type == CodecType.Audio && i.ContainsCodec(transcodingProfile.AudioCodec)) { audioCodecProfiles.Add(i); } if (audioCodecProfiles.Count >= 1) break; } List audioTranscodingConditions = new List(); foreach (CodecProfile i in audioCodecProfiles) { foreach (ProfileCondition c in i.Conditions) { audioTranscodingConditions.Add(c); } } ApplyTranscodingConditions(playlistItem, audioTranscodingConditions); // Honor requested max channels if (options.MaxAudioChannels.HasValue) { int currentValue = playlistItem.MaxAudioChannels ?? options.MaxAudioChannels.Value; playlistItem.MaxAudioChannels = Math.Min(options.MaxAudioChannels.Value, currentValue); } int configuredBitrate = options.AudioTranscodingBitrate ?? (options.Context == EncodingContext.Static ? options.Profile.MusicSyncBitrate : options.Profile.MusicStreamingTranscodingBitrate) ?? 128000; playlistItem.AudioBitrate = Math.Min(configuredBitrate, playlistItem.AudioBitrate ?? configuredBitrate); } return playlistItem; } private int? GetBitrateForDirectPlayCheck(MediaSourceInfo item, AudioOptions options) { if (item.Protocol == MediaProtocol.File) { return options.Profile.MaxStaticBitrate; } return options.GetMaxBitrate(); } private List GetAudioDirectPlayMethods(MediaSourceInfo item, MediaStream audioStream, AudioOptions options) { DirectPlayProfile directPlayProfile = null; foreach (DirectPlayProfile i in options.Profile.DirectPlayProfiles) { if (i.Type == DlnaProfileType.Audio && IsAudioDirectPlaySupported(i, item, audioStream)) { directPlayProfile = i; break; } } List playMethods = new List(); if (directPlayProfile != null) { // While options takes the network and other factors into account. Only applies to direct stream if (item.SupportsDirectStream && IsAudioEligibleForDirectPlay(item, options.GetMaxBitrate())) { playMethods.Add(PlayMethod.DirectStream); } // The profile describes what the device supports // If device requirements are satisfied then allow both direct stream and direct play if (IsAudioEligibleForDirectPlay(item, GetBitrateForDirectPlayCheck(item, options))) { playMethods.Add(PlayMethod.DirectPlay); } } return playMethods; } private int? GetDefaultSubtitleStreamIndex(MediaSourceInfo item, SubtitleProfile[] subtitleProfiles) { int highestScore = -1; foreach (MediaStream stream in item.MediaStreams) { if (stream.Type == MediaStreamType.Subtitle && stream.Score.HasValue) { if (stream.Score.Value > highestScore) { highestScore = stream.Score.Value; } } } List topStreams = new List(); foreach (MediaStream stream in item.MediaStreams) { if (stream.Type == MediaStreamType.Subtitle && stream.Score.HasValue && stream.Score.Value == highestScore) { topStreams.Add(stream); } } // If multiple streams have an equal score, try to pick the most efficient one if (topStreams.Count > 1) { foreach (MediaStream stream in topStreams) { foreach (SubtitleProfile profile in subtitleProfiles) { if (profile.Method == SubtitleDeliveryMethod.External && StringHelper.EqualsIgnoreCase(profile.Format, stream.Codec)) { return stream.Index; } } } } // If no optimization panned out, just use the original default return item.DefaultSubtitleStreamIndex; } private StreamInfo BuildVideoItem(MediaSourceInfo item, VideoOptions options) { StreamInfo playlistItem = new StreamInfo { ItemId = options.ItemId, MediaType = DlnaProfileType.Video, MediaSource = item, RunTimeTicks = item.RunTimeTicks, Context = options.Context, DeviceProfile = options.Profile }; playlistItem.SubtitleStreamIndex = options.SubtitleStreamIndex ?? GetDefaultSubtitleStreamIndex(item, options.Profile.SubtitleProfiles); MediaStream subtitleStream = playlistItem.SubtitleStreamIndex.HasValue ? item.GetMediaStream(MediaStreamType.Subtitle, playlistItem.SubtitleStreamIndex.Value) : null; MediaStream audioStream = item.GetDefaultAudioStream(options.AudioStreamIndex ?? item.DefaultAudioStreamIndex); int? audioStreamIndex = audioStream == null ? (int?)null : audioStream.Index; MediaStream videoStream = item.VideoStream; // TODO: This doesn't accout for situation of device being able to handle media bitrate, but wifi connection not fast enough bool isEligibleForDirectPlay = IsEligibleForDirectPlay(item, GetBitrateForDirectPlayCheck(item, options), subtitleStream, options); bool isEligibleForDirectStream = IsEligibleForDirectPlay(item, options.GetMaxBitrate(), subtitleStream, options); if (isEligibleForDirectPlay || isEligibleForDirectStream) { // See if it can be direct played PlayMethod? directPlay = GetVideoDirectPlayProfile(options.Profile, item, videoStream, audioStream, isEligibleForDirectPlay, isEligibleForDirectStream); if (directPlay != null) { playlistItem.PlayMethod = directPlay.Value; playlistItem.Container = item.Container; if (subtitleStream != null) { SubtitleProfile subtitleProfile = GetSubtitleProfile(subtitleStream, options.Profile.SubtitleProfiles, options.Context); playlistItem.SubtitleDeliveryMethod = subtitleProfile.Method; playlistItem.SubtitleFormat = subtitleProfile.Format; } return playlistItem; } } // Can't direct play, find the transcoding profile TranscodingProfile transcodingProfile = null; foreach (TranscodingProfile i in options.Profile.TranscodingProfiles) { if (i.Type == playlistItem.MediaType && i.Context == options.Context) { transcodingProfile = i; break; } } if (transcodingProfile != null) { if (!item.SupportsTranscoding) { return null; } if (subtitleStream != null) { SubtitleProfile subtitleProfile = GetSubtitleProfile(subtitleStream, options.Profile.SubtitleProfiles, options.Context); playlistItem.SubtitleDeliveryMethod = subtitleProfile.Method; playlistItem.SubtitleFormat = subtitleProfile.Format; } playlistItem.PlayMethod = PlayMethod.Transcode; playlistItem.Container = transcodingProfile.Container; playlistItem.EstimateContentLength = transcodingProfile.EstimateContentLength; playlistItem.TranscodeSeekInfo = transcodingProfile.TranscodeSeekInfo; playlistItem.AudioCodec = transcodingProfile.AudioCodec.Split(',')[0]; playlistItem.VideoCodec = transcodingProfile.VideoCodec; playlistItem.SubProtocol = transcodingProfile.Protocol; playlistItem.AudioStreamIndex = audioStreamIndex; List videoTranscodingConditions = new List(); foreach (CodecProfile i in options.Profile.CodecProfiles) { if (i.Type == CodecType.Video && i.ContainsCodec(transcodingProfile.VideoCodec)) { foreach (ProfileCondition c in i.Conditions) { videoTranscodingConditions.Add(c); } break; } } ApplyTranscodingConditions(playlistItem, videoTranscodingConditions); List audioTranscodingConditions = new List(); foreach (CodecProfile i in options.Profile.CodecProfiles) { if (i.Type == CodecType.VideoAudio && i.ContainsCodec(transcodingProfile.AudioCodec)) { foreach (ProfileCondition c in i.Conditions) { audioTranscodingConditions.Add(c); } break; } } ApplyTranscodingConditions(playlistItem, audioTranscodingConditions); // Honor requested max channels if (options.MaxAudioChannels.HasValue) { int currentValue = playlistItem.MaxAudioChannels ?? options.MaxAudioChannels.Value; playlistItem.MaxAudioChannels = Math.Min(options.MaxAudioChannels.Value, currentValue); } if (!playlistItem.AudioBitrate.HasValue) { playlistItem.AudioBitrate = GetAudioBitrate(playlistItem.TargetAudioChannels, playlistItem.TargetAudioCodec); } int? maxBitrateSetting = options.GetMaxBitrate(); // Honor max rate if (maxBitrateSetting.HasValue) { int videoBitrate = maxBitrateSetting.Value; if (playlistItem.AudioBitrate.HasValue) { videoBitrate -= playlistItem.AudioBitrate.Value; } int currentValue = playlistItem.VideoBitrate ?? videoBitrate; playlistItem.VideoBitrate = Math.Min(videoBitrate, currentValue); } } return playlistItem; } private int GetAudioBitrate(int? channels, string codec) { if (channels.HasValue) { if (channels.Value >= 5) { return 320000; } } return 128000; } private PlayMethod? GetVideoDirectPlayProfile(DeviceProfile profile, MediaSourceInfo mediaSource, MediaStream videoStream, MediaStream audioStream, bool isEligibleForDirectPlay, bool isEligibleForDirectStream) { // See if it can be direct played DirectPlayProfile directPlay = null; foreach (DirectPlayProfile i in profile.DirectPlayProfiles) { if (i.Type == DlnaProfileType.Video && IsVideoDirectPlaySupported(i, mediaSource, videoStream, audioStream)) { directPlay = i; break; } } if (directPlay == null) { return null; } string container = mediaSource.Container; List conditions = new List(); foreach (ContainerProfile i in profile.ContainerProfiles) { if (i.Type == DlnaProfileType.Video && ListHelper.ContainsIgnoreCase(i.GetContainers(), container)) { foreach (ProfileCondition c in i.Conditions) { conditions.Add(c); } } } ConditionProcessor conditionProcessor = new ConditionProcessor(); int? width = videoStream == null ? null : videoStream.Width; int? height = videoStream == null ? null : videoStream.Height; int? bitDepth = videoStream == null ? null : videoStream.BitDepth; int? videoBitrate = videoStream == null ? null : videoStream.BitRate; double? videoLevel = videoStream == null ? null : videoStream.Level; string videoProfile = videoStream == null ? null : videoStream.Profile; float? videoFramerate = videoStream == null ? null : videoStream.AverageFrameRate ?? videoStream.AverageFrameRate; bool? isAnamorphic = videoStream == null ? null : videoStream.IsAnamorphic; bool? isCabac = videoStream == null ? null : videoStream.IsCabac; int? audioBitrate = audioStream == null ? null : audioStream.BitRate; int? audioChannels = audioStream == null ? null : audioStream.Channels; string audioProfile = audioStream == null ? null : audioStream.Profile; TransportStreamTimestamp? timestamp = videoStream == null ? TransportStreamTimestamp.None : mediaSource.Timestamp; int? packetLength = videoStream == null ? null : videoStream.PacketLength; int? refFrames = videoStream == null ? null : videoStream.RefFrames; int? numAudioStreams = mediaSource.GetStreamCount(MediaStreamType.Audio); int? numVideoStreams = mediaSource.GetStreamCount(MediaStreamType.Video); // Check container conditions foreach (ProfileCondition i in conditions) { if (!conditionProcessor.IsVideoConditionSatisfied(i, audioBitrate, audioChannels, width, height, bitDepth, videoBitrate, videoProfile, videoLevel, videoFramerate, packetLength, timestamp, isAnamorphic, isCabac, refFrames, numVideoStreams, numAudioStreams)) { return null; } } string videoCodec = videoStream == null ? null : videoStream.Codec; if (string.IsNullOrEmpty(videoCodec)) { return null; } conditions = new List(); foreach (CodecProfile i in profile.CodecProfiles) { if (i.Type == CodecType.Video && i.ContainsCodec(videoCodec)) { foreach (ProfileCondition c in i.Conditions) { conditions.Add(c); } } } foreach (ProfileCondition i in conditions) { if (!conditionProcessor.IsVideoConditionSatisfied(i, audioBitrate, audioChannels, width, height, bitDepth, videoBitrate, videoProfile, videoLevel, videoFramerate, packetLength, timestamp, isAnamorphic, isCabac, refFrames, numVideoStreams, numAudioStreams)) { return null; } } if (audioStream != null) { string audioCodec = audioStream.Codec; if (string.IsNullOrEmpty(audioCodec)) { return null; } conditions = new List(); foreach (CodecProfile i in profile.CodecProfiles) { if (i.Type == CodecType.VideoAudio && i.ContainsCodec(audioCodec)) { foreach (ProfileCondition c in i.Conditions) { conditions.Add(c); } } } foreach (ProfileCondition i in conditions) { bool? isSecondaryAudio = audioStream == null ? null : mediaSource.IsSecondaryAudio(audioStream); if (!conditionProcessor.IsVideoAudioConditionSatisfied(i, audioChannels, audioBitrate, audioProfile, isSecondaryAudio)) { return null; } } } if (isEligibleForDirectPlay) { if (mediaSource.Protocol == MediaProtocol.Http) { if (_localPlayer.CanAccessUrl(mediaSource.Path, mediaSource.RequiredHttpHeaders.Count > 0)) { return PlayMethod.DirectPlay; } } else if (mediaSource.Protocol == MediaProtocol.File) { if (_localPlayer.CanAccessFile(mediaSource.Path)) { return PlayMethod.DirectPlay; } } } if (isEligibleForDirectStream) { if (mediaSource.SupportsDirectStream) { return PlayMethod.DirectStream; } } return null; } private bool IsEligibleForDirectPlay(MediaSourceInfo item, int? maxBitrate, MediaStream subtitleStream, VideoOptions options) { if (subtitleStream != null) { SubtitleProfile subtitleProfile = GetSubtitleProfile(subtitleStream, options.Profile.SubtitleProfiles, options.Context); if (subtitleProfile.Method != SubtitleDeliveryMethod.External && subtitleProfile.Method != SubtitleDeliveryMethod.Embed) { return false; } } return IsAudioEligibleForDirectPlay(item, maxBitrate); } public static SubtitleProfile GetSubtitleProfile(MediaStream subtitleStream, SubtitleProfile[] subtitleProfiles, EncodingContext context) { // Look for an external profile that matches the stream type (text/graphical) foreach (SubtitleProfile profile in subtitleProfiles) { bool requiresConversion = !StringHelper.EqualsIgnoreCase(subtitleStream.Codec, profile.Format); if (!profile.SupportsLanguage(subtitleStream.Language)) { continue; } if (profile.Method == SubtitleDeliveryMethod.External && subtitleStream.IsTextSubtitleStream == MediaStream.IsTextFormat(profile.Format)) { if (!requiresConversion) { return profile; } if (subtitleStream.SupportsExternalStream) { return profile; } // For sync we can handle the longer extraction times if (context == EncodingContext.Static && subtitleStream.IsTextSubtitleStream) { return profile; } } } foreach (SubtitleProfile profile in subtitleProfiles) { bool requiresConversion = !StringHelper.EqualsIgnoreCase(subtitleStream.Codec, profile.Format); if (!profile.SupportsLanguage(subtitleStream.Language)) { continue; } if (profile.Method == SubtitleDeliveryMethod.Embed && subtitleStream.IsTextSubtitleStream == MediaStream.IsTextFormat(profile.Format)) { if (!requiresConversion) { return profile; } return profile; } } return new SubtitleProfile { Method = SubtitleDeliveryMethod.Encode, Format = subtitleStream.Codec }; } private bool IsAudioEligibleForDirectPlay(MediaSourceInfo item, int? maxBitrate) { // Honor the max bitrate setting return !maxBitrate.HasValue || (item.Bitrate.HasValue && item.Bitrate.Value <= maxBitrate.Value); } private void ValidateInput(VideoOptions options) { ValidateAudioInput(options); if (options.AudioStreamIndex.HasValue && string.IsNullOrEmpty(options.MediaSourceId)) { throw new ArgumentException("MediaSourceId is required when a specific audio stream is requested"); } if (options.SubtitleStreamIndex.HasValue && string.IsNullOrEmpty(options.MediaSourceId)) { throw new ArgumentException("MediaSourceId is required when a specific subtitle stream is requested"); } } private void ValidateAudioInput(AudioOptions options) { if (string.IsNullOrEmpty(options.ItemId)) { throw new ArgumentException("ItemId is required"); } if (string.IsNullOrEmpty(options.DeviceId)) { throw new ArgumentException("DeviceId is required"); } if (options.Profile == null) { throw new ArgumentException("Profile is required"); } if (options.MediaSources == null) { throw new ArgumentException("MediaSources is required"); } } private void ApplyTranscodingConditions(StreamInfo item, IEnumerable conditions) { foreach (ProfileCondition condition in conditions) { string value = condition.Value; if (string.IsNullOrEmpty(value)) { continue; } // No way to express this if (condition.Condition == ProfileConditionType.GreaterThanEqual) { continue; } switch (condition.Property) { case ProfileConditionValue.AudioBitrate: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.AudioBitrate = num; } break; } case ProfileConditionValue.AudioChannels: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.MaxAudioChannels = num; } break; } case ProfileConditionValue.IsCabac: { bool val; if (BoolHelper.TryParseCultureInvariant(value, out val)) { if (condition.Condition == ProfileConditionType.Equals) { item.Cabac = val; } else if (condition.Condition == ProfileConditionType.NotEquals) { item.Cabac = !val; } } break; } case ProfileConditionValue.IsAnamorphic: case ProfileConditionValue.AudioProfile: case ProfileConditionValue.Has64BitOffsets: case ProfileConditionValue.PacketLength: case ProfileConditionValue.NumAudioStreams: case ProfileConditionValue.NumVideoStreams: case ProfileConditionValue.IsSecondaryAudio: case ProfileConditionValue.VideoTimestamp: { // Not supported yet break; } case ProfileConditionValue.RefFrames: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.MaxRefFrames = num; } break; } case ProfileConditionValue.VideoBitDepth: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.MaxVideoBitDepth = num; } break; } case ProfileConditionValue.VideoProfile: { item.VideoProfile = (value ?? string.Empty).Split('|')[0]; break; } case ProfileConditionValue.Height: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.MaxHeight = num; } break; } case ProfileConditionValue.VideoBitrate: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.VideoBitrate = num; } break; } case ProfileConditionValue.VideoFramerate: { float num; if (FloatHelper.TryParseCultureInvariant(value, out num)) { item.MaxFramerate = num; } break; } case ProfileConditionValue.VideoLevel: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.VideoLevel = num; } break; } case ProfileConditionValue.Width: { int num; if (IntHelper.TryParseCultureInvariant(value, out num)) { item.MaxWidth = num; } break; } default: throw new ArgumentException("Unrecognized ProfileConditionValue"); } } } private bool IsAudioDirectPlaySupported(DirectPlayProfile profile, MediaSourceInfo item, MediaStream audioStream) { if (profile.Container.Length > 0) { // Check container type string mediaContainer = item.Container ?? string.Empty; bool any = false; foreach (string i in profile.GetContainers()) { if (StringHelper.EqualsIgnoreCase(i, mediaContainer)) { any = true; break; } } if (!any) { return false; } } return true; } private bool IsVideoDirectPlaySupported(DirectPlayProfile profile, MediaSourceInfo item, MediaStream videoStream, MediaStream audioStream) { if (profile.Container.Length > 0) { // Check container type string mediaContainer = item.Container ?? string.Empty; bool any = false; foreach (string i in profile.GetContainers()) { if (StringHelper.EqualsIgnoreCase(i, mediaContainer)) { any = true; break; } } if (!any) { return false; } } // Check video codec List videoCodecs = profile.GetVideoCodecs(); if (videoCodecs.Count > 0) { string videoCodec = videoStream == null ? null : videoStream.Codec; if (string.IsNullOrEmpty(videoCodec) || !ListHelper.ContainsIgnoreCase(videoCodecs, videoCodec)) { return false; } } List audioCodecs = profile.GetAudioCodecs(); if (audioCodecs.Count > 0) { // Check audio codecs string audioCodec = audioStream == null ? null : audioStream.Codec; if (string.IsNullOrEmpty(audioCodec) || !ListHelper.ContainsIgnoreCase(audioCodecs, audioCodec)) { return false; } } return true; } } }