improve hls direct compatibility with channels dvr (#245)

* rename HttpLiveStreaming to HttpLiveStreamingDirect

* improve hls direct compatibility with channels dvr

* code cleanup

CHANGELOG.md

@@ -6,8 +6,15 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Added
 - Support `(Part #)` name suffixes for multi-part episode grouping
-- Support multi-episode files in local libraries
+- Support multi-episode files in local and Plex libraries
 - Save Channels table page size
+- Add optional query string parameter to M3U channel playlist to allow some customization per client
+    - `?mode=ts` will force `MPEG-TS` mode for all channels
+    - `?mode=hls-direct` will force `HLS Direct` mode for all channels
+    - `?mode=mixed` or no parameter will maintain existing behavior
+
+### Changed
+- Rename channel mode `TransportStream` to `MPEG-TS` and `HttpLiveStreaming` to `HLS Direct`
 
 ### Fixed
 - Fix search result crashes due to missing season metadata

ErsatzTV.Application/Channels/Queries/GetChannelPlaylist.cs

@@ -3,5 +3,5 @@ using MediatR;
 
 namespace ErsatzTV.Application.Channels.Queries
 {
-    public record GetChannelPlaylist(string Scheme, string Host) : IRequest<ChannelPlaylist>;
+    public record GetChannelPlaylist(string Scheme, string Host, string Mode) : IRequest<ChannelPlaylist>;
 }

ErsatzTV.Application/Channels/Queries/GetChannelPlaylistHandler.cs

@@ -1,5 +1,7 @@
-using System.Threading;
+using System.Collections.Generic;
+using System.Threading;
 using System.Threading.Tasks;
+using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Repositories;
 using ErsatzTV.Core.Iptv;
 using LanguageExt;
@@ -16,6 +18,31 @@ namespace ErsatzTV.Application.Channels.Queries
 
         public Task<ChannelPlaylist> Handle(GetChannelPlaylist request, CancellationToken cancellationToken) =>
             _channelRepository.GetAll()
+                .Map(channels => EnsureMode(channels, request.Mode))
                 .Map(channels => new ChannelPlaylist(request.Scheme, request.Host, channels));
+
+        private static List<Channel> EnsureMode(IEnumerable<Channel> channels, string mode)
+        {
+            var result = new List<Channel>();
+            foreach (Channel channel in channels)
+            {
+                switch (mode.ToLowerInvariant())
+                {
+                    case "hls-direct":
+                        channel.StreamingMode = StreamingMode.HttpLiveStreamingDirect;
+                        result.Add(channel);
+                        break;
+                    case "ts":
+                        channel.StreamingMode = StreamingMode.TransportStream;
+                        result.Add(channel);
+                        break;
+                    default:
+                        result.Add(channel);
+                        break;
+                }
+            }
+
+            return result;
+        }
     }
 }

ErsatzTV.Application/Streaming/Queries/FFmpegProcessHandler.cs

@@ -39,6 +39,18 @@ namespace ErsatzTV.Application.Streaming.Queries
 
         private async Task<Validation<BaseError, Channel>> ChannelMustExist(T request) =>
             (await _channelRepository.GetByNumber(request.ChannelNumber))
+            .Map(
+                channel =>
+                {
+                    channel.StreamingMode = request.Mode.ToLowerInvariant() switch
+                    {
+                        "hls-direct" => StreamingMode.HttpLiveStreamingDirect,
+                        "ts" => StreamingMode.TransportStream,
+                        _ => channel.StreamingMode
+                    };
+
+                    return channel;
+                })
             .ToValidation<BaseError>($"Channel number {request.ChannelNumber} does not exist.");
 
         private Task<Validation<BaseError, string>> FFmpegPathMustExist() =>

ErsatzTV.Application/Streaming/Queries/FFmpegProcessRequest.cs

@@ -5,5 +5,5 @@ using MediatR;
 
 namespace ErsatzTV.Application.Streaming.Queries
 {
-    public record FFmpegProcessRequest(string ChannelNumber) : IRequest<Either<BaseError, Process>>;
+    public record FFmpegProcessRequest(string ChannelNumber, string Mode) : IRequest<Either<BaseError, Process>>;
 }

ErsatzTV.Application/Streaming/Queries/GetConcatProcessByChannelNumber.cs

@@ -2,7 +2,9 @@
 {
     public record GetConcatProcessByChannelNumber : FFmpegProcessRequest
     {
-        public GetConcatProcessByChannelNumber(string scheme, string host, string channelNumber) : base(channelNumber)
+        public GetConcatProcessByChannelNumber(string scheme, string host, string channelNumber) : base(
+            channelNumber,
+            "ts")
         {
             Scheme = scheme;
             Host = host;

ErsatzTV.Application/Streaming/Queries/GetHlsPlaylistByChannelNumberHandler.cs

@@ -6,6 +6,7 @@ using ErsatzTV.Core.Domain;
 using ErsatzTV.Core.Interfaces.Repositories;
 using LanguageExt;
 using MediatR;
+using Microsoft.Extensions.Caching.Memory;
 using Serilog;
 
 namespace ErsatzTV.Application.Streaming.Queries
@@ -14,14 +15,17 @@ namespace ErsatzTV.Application.Streaming.Queries
         GetHlsPlaylistByChannelNumberHandler : IRequestHandler<GetHlsPlaylistByChannelNumber, Either<BaseError, string>>
     {
         private readonly IChannelRepository _channelRepository;
+        private readonly IMemoryCache _memoryCache;
         private readonly IPlayoutRepository _playoutRepository;
 
         public GetHlsPlaylistByChannelNumberHandler(
             IChannelRepository channelRepository,
-            IPlayoutRepository playoutRepository)
+            IPlayoutRepository playoutRepository,
+            IMemoryCache memoryCache)
         {
             _channelRepository = channelRepository;
             _playoutRepository = playoutRepository;
+            _memoryCache = memoryCache;
         }
 
         public Task<Either<BaseError, string>> Handle(
@@ -40,12 +44,15 @@ namespace ErsatzTV.Application.Streaming.Queries
             return maybePlayoutItem.Match<Either<BaseError, string>>(
                 playoutItem =>
                 {
-                    double timeRemaining = Math.Abs((playoutItem.Finish - now).TotalSeconds);
+                    long index = GetIndexForChannel(channel, playoutItem);
+                    double timeRemaining = Math.Abs((playoutItem.FinishOffset - now).TotalSeconds);
                     return $@"#EXTM3U
 #EXT-X-VERSION:3
-#EXT-X-TARGETDURATION:18000
+#EXT-X-TARGETDURATION:6
+#EXT-X-MEDIA-SEQUENCE:{index}
+#EXT-X-DISCONTINUITY
 #EXTINF:{timeRemaining:F2},
-{request.Scheme}://{request.Host}/ffmpeg/stream/{request.ChannelNumber}
+{request.Scheme}://{request.Host}/ffmpeg/stream/{request.ChannelNumber}?index={index}&mode=hls-direct
 ";
                 },
                 () =>
@@ -59,5 +66,36 @@ namespace ErsatzTV.Application.Streaming.Queries
         private async Task<Validation<BaseError, Channel>> ChannelMustExist(GetHlsPlaylistByChannelNumber request) =>
             (await _channelRepository.GetByNumber(request.ChannelNumber))
             .ToValidation<BaseError>($"Channel number {request.ChannelNumber} does not exist.");
+
+        private long GetIndexForChannel(Channel channel, PlayoutItem playoutItem)
+        {
+            long ticks = playoutItem.Start.Ticks;
+            var key = new ChannelIndexKey(channel.Id);
+
+            long index;
+            if (_memoryCache.TryGetValue(key, out ChannelIndexRecord channelRecord))
+            {
+                if (channelRecord.StartTicks == ticks)
+                {
+                    index = channelRecord.Index;
+                }
+                else
+                {
+                    index = channelRecord.Index + 1;
+                    _memoryCache.Set(key, new ChannelIndexRecord(ticks, index), TimeSpan.FromDays(1));
+                }
+            }
+            else
+            {
+                index = 1;
+                _memoryCache.Set(key, new ChannelIndexRecord(ticks, index), TimeSpan.FromDays(1));
+            }
+
+            return index;
+        }
+
+        private record ChannelIndexKey(int ChannelId);
+
+        private record ChannelIndexRecord(long StartTicks, long Index);
     }
 }

ErsatzTV.Application/Streaming/Queries/GetPlayoutItemProcessByChannelNumber.cs

@@ -2,7 +2,7 @@
 {
     public record GetPlayoutItemProcessByChannelNumber : FFmpegProcessRequest
     {
-        public GetPlayoutItemProcessByChannelNumber(string channelNumber) : base(channelNumber)
+        public GetPlayoutItemProcessByChannelNumber(string channelNumber, string mode) : base(channelNumber, mode)
         {
         }
     }

ErsatzTV.Core.Tests/FFmpeg/FFmpegPlaybackSettingsCalculatorTests.cs

@@ -40,7 +40,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 FFmpegProfile ffmpegProfile = TestProfile() with { ThreadCount = 7 };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     new MediaVersion(),
                     new MediaStream(),
@@ -76,7 +76,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 FFmpegProfile ffmpegProfile = TestProfile();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     new MediaVersion(),
                     new MediaStream(),
@@ -112,7 +112,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 FFmpegProfile ffmpegProfile = TestProfile();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     new MediaVersion(),
                     new MediaStream(),
@@ -151,7 +151,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 FFmpegProfile ffmpegProfile = TestProfile();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     new MediaVersion(),
                     new MediaStream(),
@@ -317,7 +317,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 var version = new MediaVersion { Width = 1918, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     version,
                     new MediaStream(),
@@ -426,7 +426,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                     { Width = 1920, Height = 1080, SampleAspectRatio = "1:1" };
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     version,
                     new MediaStream { Codec = "mpeg2video" },
@@ -718,7 +718,7 @@ namespace ErsatzTV.Core.Tests.FFmpeg
                 var version = new MediaVersion();
 
                 FFmpegPlaybackSettings actual = _calculator.CalculateSettings(
-                    StreamingMode.HttpLiveStreaming,
+                    StreamingMode.HttpLiveStreamingDirect,
                     ffmpegProfile,
                     version,
                     new MediaStream(),

ErsatzTV.Core/Domain/StreamingMode.cs

@@ -3,6 +3,6 @@
     public enum StreamingMode
     {
         TransportStream = 1,
-        HttpLiveStreaming = 2
+        HttpLiveStreamingDirect = 2
     }
 }

ErsatzTV.Core/FFmpeg/FFmpegPlaybackSettingsCalculator.cs

@@ -64,7 +64,7 @@ namespace ErsatzTV.Core.FFmpeg
 
             switch (streamingMode)
             {
-                case StreamingMode.HttpLiveStreaming:
+                case StreamingMode.HttpLiveStreamingDirect:
                     result.AudioCodec = "copy";
                     result.VideoCodec = "copy";
                     result.Deinterlace = false;

ErsatzTV.Core/FFmpeg/FFmpegStreamSelector.cs

@@ -28,7 +28,7 @@ namespace ErsatzTV.Core.FFmpeg
 
         public async Task<Option<MediaStream>> SelectAudioStream(Channel channel, MediaVersion version)
         {
-            if (channel.StreamingMode == StreamingMode.HttpLiveStreaming &&
+            if (channel.StreamingMode == StreamingMode.HttpLiveStreamingDirect &&
                 string.IsNullOrWhiteSpace(channel.PreferredLanguageCode))
             {
                 _logger.LogDebug(

ErsatzTV.Core/Hdhr/LineupItem.cs

@@ -22,7 +22,7 @@ namespace ErsatzTV.Core.Hdhr
 
         public string URL => _channel.StreamingMode switch
         {
-            StreamingMode.HttpLiveStreaming => $"{_scheme}://{_host}/iptv/channel/{_channel.Number}.m3u8",
+            StreamingMode.HttpLiveStreamingDirect => $"{_scheme}://{_host}/iptv/channel/{_channel.Number}.m3u8",
             _ => $"{_scheme}://{_host}/iptv/channel/{_channel.Number}.ts"
         };
     }

ErsatzTV.Core/Iptv/ChannelPlaylist.cs

@@ -42,7 +42,7 @@ namespace ErsatzTV.Core.Iptv
 
                 string format = channel.StreamingMode switch
                 {
-                    StreamingMode.HttpLiveStreaming => "m3u8",
+                    StreamingMode.HttpLiveStreamingDirect => "m3u8",
                     _ => "ts"
                 };
 

ErsatzTV.Core/Metadata/LocalMetadataProvider.cs

@@ -177,7 +177,7 @@ namespace ErsatzTV.Core.Metadata
         private async Task<bool> ApplyMetadataUpdate(Episode episode, List<EpisodeMetadata> episodeMetadata)
         {
             var updated = false;
-            
+
             episode.EpisodeMetadata ??= new List<EpisodeMetadata>();
 
             var toUpdate = episode.EpisodeMetadata

ErsatzTV.Core/Metadata/TelevisionFolderScanner.cs

@@ -22,9 +22,9 @@ namespace ErsatzTV.Core.Metadata
         private readonly ILibraryRepository _libraryRepository;
         private readonly ILocalFileSystem _localFileSystem;
         private readonly ILocalMetadataProvider _localMetadataProvider;
-        private readonly IMetadataRepository _metadataRepository;
         private readonly ILogger<TelevisionFolderScanner> _logger;
         private readonly IMediator _mediator;
+        private readonly IMetadataRepository _metadataRepository;
         private readonly ISearchIndex _searchIndex;
         private readonly ISearchRepository _searchRepository;
         private readonly ITelevisionRepository _televisionRepository;
@@ -276,7 +276,7 @@ namespace ErsatzTV.Core.Metadata
         private async Task<Either<BaseError, Season>> EnsureMetadataExists(Season season)
         {
             season.SeasonMetadata ??= new List<SeasonMetadata>();
-            
+
             if (!season.SeasonMetadata.Any())
             {
                 var metadata = new SeasonMetadata

ErsatzTV.Core/Plex/PlexTelevisionLibraryScanner.cs

@@ -428,12 +428,12 @@ namespace ErsatzTV.Core.Plex
             var toAdd = incoming.EpisodeMetadata
                 .Where(em => existing.EpisodeMetadata.All(em2 => em2.EpisodeNumber != em.EpisodeNumber))
                 .ToList();
-            
+
             foreach (EpisodeMetadata metadata in toRemove)
             {
                 await _televisionRepository.RemoveMetadata(existing, metadata);
             }
-            
+
             foreach (EpisodeMetadata metadata in toAdd)
             {
                 metadata.EpisodeId = existing.Id;
@@ -442,7 +442,7 @@ namespace ErsatzTV.Core.Plex
 
                 await _metadataRepository.Add(metadata);
             }
-            
+
             // TODO: update existing metadata
 
             return existing;

ErsatzTV.Infrastructure/Plex/PlexServerApiClient.cs

@@ -119,27 +119,6 @@ namespace ErsatzTV.Infrastructure.Plex
             }
         }
 
-        private List<PlexEpisode> ProcessMultiEpisodeFiles(IEnumerable<PlexEpisode> episodes)
-        {
-            // add all metadata from duplicate paths to first entry with given path
-            // i.e. s1e1 episode will add s1e2 metadata if s1e1 and s1e2 have same physical path
-            var result = new Dictionary<string, PlexEpisode>();
-            foreach (PlexEpisode episode in episodes.OrderBy(e => e.EpisodeMetadata.Head().EpisodeNumber))
-            {
-                string path = episode.MediaVersions.Head().MediaFiles.Head().Path;
-                if (result.TryGetValue(path, out PlexEpisode existing))
-                {
-                    existing.EpisodeMetadata.Add(episode.EpisodeMetadata.Head());
-                }
-                else
-                {
-                    result.Add(path, episode);
-                }
-            }
-
-            return result.Values.ToList();
-        }
-
         public async Task<Either<BaseError, MovieMetadata>> GetMovieMetadata(
             PlexLibrary library,
             string key,
@@ -247,6 +226,27 @@ namespace ErsatzTV.Infrastructure.Plex
             }
         }
 
+        private List<PlexEpisode> ProcessMultiEpisodeFiles(IEnumerable<PlexEpisode> episodes)
+        {
+            // add all metadata from duplicate paths to first entry with given path
+            // i.e. s1e1 episode will add s1e2 metadata if s1e1 and s1e2 have same physical path
+            var result = new Dictionary<string, PlexEpisode>();
+            foreach (PlexEpisode episode in episodes.OrderBy(e => e.EpisodeMetadata.Head().EpisodeNumber))
+            {
+                string path = episode.MediaVersions.Head().MediaFiles.Head().Path;
+                if (result.TryGetValue(path, out PlexEpisode existing))
+                {
+                    existing.EpisodeMetadata.Add(episode.EpisodeMetadata.Head());
+                }
+                else
+                {
+                    result.Add(path, episode);
+                }
+            }
+
+            return result.Values.ToList();
+        }
+
         private static IPlexServerApi XmlServiceFor(string uri)
         {
             var overrides = new XmlAttributeOverrides();

ErsatzTV/Controllers/InternalController.cs

@@ -27,8 +27,11 @@ namespace ErsatzTV.Controllers
                 .ToActionResult();
 
         [HttpGet("ffmpeg/stream/{channelNumber}")]
-        public Task<IActionResult> GetStream(string channelNumber) =>
-            _mediator.Send(new GetPlayoutItemProcessByChannelNumber(channelNumber)).Map(
+        public Task<IActionResult> GetStream(
+            string channelNumber,
+            [FromQuery]
+            string mode = "mixed") =>
+            _mediator.Send(new GetPlayoutItemProcessByChannelNumber(channelNumber, mode)).Map(
                 result =>
                     result.Match<IActionResult>(
                         process =>

ErsatzTV/Controllers/IptvController.cs

@@ -27,8 +27,10 @@ namespace ErsatzTV.Controllers
         }
 
         [HttpGet("iptv/channels.m3u")]
-        public Task<IActionResult> GetChannelPlaylist() =>
-            _mediator.Send(new GetChannelPlaylist(Request.Scheme, Request.Host.ToString()))
+        public Task<IActionResult> GetChannelPlaylist(
+            [FromQuery]
+            string mode = "mixed") =>
+            _mediator.Send(new GetChannelPlaylist(Request.Scheme, Request.Host.ToString(), mode))
                 .Map<ChannelPlaylist, IActionResult>(Ok);
 
         [HttpGet("iptv/xmltv.xml")]
@@ -54,14 +56,14 @@ namespace ErsatzTV.Controllers
 
         [HttpGet("iptv/channel/{channelNumber}.m3u8")]
         public Task<IActionResult> GetHttpLiveStreamingVideo(string channelNumber) =>
-            _mediator.Send(new GetHlsPlaylistByChannelNumber(Request.Scheme, Request.Host.ToString(), channelNumber))
+            _mediator.Send(
+                    new GetHlsPlaylistByChannelNumber(
+                        Request.Scheme,
+                        Request.Host.ToString(),
+                        channelNumber))
                 .Map(
                     result => result.Match<IActionResult>(
-                        playlist =>
-                        {
-                            _logger.LogInformation("Starting hls stream for channel {ChannelNumber}", channelNumber);
-                            return Content(playlist, "application/x-mpegurl");
-                        },
+                        playlist => Content(playlist, "application/x-mpegurl"),
                         error => BadRequest(error.Value)));
 
         [HttpGet("iptv/logos/{fileName}")]

ErsatzTV/Pages/ChannelEditor.razor

@@ -24,10 +24,8 @@
                     <MudTextField Label="Number" @bind-Value="_model.Number" For="@(() => _model.Number)" Immediate="true"/>
                     <MudTextField Class="mt-3" Label="Name" @bind-Value="_model.Name" For="@(() => _model.Name)"/>
                     <MudSelect Class="mt-3" Label="Streaming Mode" @bind-Value="_model.StreamingMode" For="@(() => _model.StreamingMode)">
-                        @foreach (StreamingMode streamingMode in Enum.GetValues<StreamingMode>())
-                        {
-                            <MudSelectItem Value="@streamingMode">@streamingMode</MudSelectItem>
-                        }
+                        <MudSelectItem Value="@(StreamingMode.TransportStream)">MPEG-TS</MudSelectItem>
+                        <MudSelectItem Value="@(StreamingMode.HttpLiveStreamingDirect)">HLS Direct</MudSelectItem>
                     </MudSelect>
                     <MudSelect Class="mt-3" Label="FFmpeg Profile" @bind-Value="_model.FFmpegProfileId" For="@(() => _model.FFmpegProfileId)"
                                Disabled="@(_model.StreamingMode != StreamingMode.TransportStream)">

ErsatzTV/Pages/Channels.razor

@@ -50,7 +50,7 @@
             </MudTd>
             <MudTd DataLabel="Name">@context.Name</MudTd>
             <MudTd DataLabel="Language">@context.PreferredLanguageCode</MudTd>
-            <MudTd DataLabel="Mode">@(context.StreamingMode == StreamingMode.TransportStream ? "TS" : "HLS")</MudTd>
+            <MudTd DataLabel="Mode">@(context.StreamingMode == StreamingMode.TransportStream ? "MPEG-TS" : "HLS Direct")</MudTd>
             <MudTd DataLabel="FFmpeg Profile">
                 @if (context.StreamingMode == StreamingMode.TransportStream)
                 {

docs/user-guide/create-channels.md

@@ -8,9 +8,9 @@ Channel numbers can be whole numbers or can contain one decimal, like `500` or `
 
 ### Streaming Mode
 
-Two streaming modes are currently supported: `Transport Stream` and `HttpLiveStreaming`.
-`Transport Stream` is considered stable and is recommended for most purposes.
-`HttpLiveStreaming` is unstable and is not recommended for general use.
+Two streaming modes are currently supported: `MPEG-TS` (Transport Stream) and `HLS Direct` (HTTP Live Streaming Direct).
+`MPEG-TS` is considered stable and is recommended for most purposes.
+`HLS Direct` is unstable and is not recommended for general use, but can avoid the need to transcode with some clients.
 
 ### FFmpeg Profile