Share decoder live sources and bound web playback startup
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Http;
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using System.Threading;
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using System.Threading.Channels;
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using System.Threading.Tasks;
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using MediaBrowser.Controller;
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using Microsoft.AspNetCore.Authorization;
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using Microsoft.AspNetCore.Mvc;
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namespace Jellyfin.Plugin.Enigma2;
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/// <summary>Shares one receiver HTTP connection between probing and all consumers of a channel.</summary>
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public sealed class LiveStreamRelay : IDisposable
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{
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private readonly HttpClient client;
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private readonly int port;
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private readonly Dictionary<string, Source> sources = new();
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private readonly Dictionary<string, Source> tokens = new();
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private readonly object gate = new();
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private int opened;
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private readonly TimeSpan idleGrace;
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public LiveStreamRelay(IServerApplicationHost host) : this(new HttpClient(new SocketsHttpHandler { ConnectTimeout = TimeSpan.FromSeconds(3), AllowAutoRedirect = false }), host.HttpPort) { }
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public LiveStreamRelay(HttpClient client, int port, TimeSpan? idleGrace = null) { this.client = client; client.Timeout = Timeout.InfiniteTimeSpan; this.port = port; this.idleGrace = idleGrace ?? TimeSpan.FromSeconds(15); }
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public string Register(string url)
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{
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lock (gate)
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{
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if (!sources.TryGetValue(url, out var source))
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{
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source = new Source(this, url);
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sources.Add(url, source); tokens.Add(source.Id, source);
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}
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return $"http://127.0.0.1:{port}/DecoderIntegration/Live/{source.Id}";
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}
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}
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public Task<Subscription> Subscribe(string id, CancellationToken token)
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{
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Source source;
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lock (gate) if (!tokens.TryGetValue(id, out source)) throw new FileNotFoundException();
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return source.Subscribe(token);
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}
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public object Status()
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{
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lock (gate) return new { UpstreamConnectionsOpened = opened, ActiveSources = sources.Values.Count(s => s.Active), Consumers = sources.Values.Sum(s => s.Consumers), LastErrors = sources.Values.Select(s => s.LastError).Where(s => s != null).ToArray(), Channels = sources.Values.Select(s => new { s.Id, s.ServiceReference, s.Active, s.Consumers }).ToArray() };
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}
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public void Dispose() { lock (gate) foreach (var s in sources.Values) s.Stop(); client.Dispose(); }
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public sealed class Subscription : IAsyncDisposable
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{
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private readonly Source source;
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internal readonly Channel<byte[]> Buffer = Channel.CreateBounded<byte[]>(new BoundedChannelOptions(128) { FullMode = BoundedChannelFullMode.Wait, SingleReader = true });
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internal Subscription(Source source) { this.source = source; }
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public ChannelReader<byte[]> Reader => Buffer.Reader;
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public ValueTask DisposeAsync() { source.Remove(this); return ValueTask.CompletedTask; }
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}
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internal sealed class Source
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{
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private readonly LiveStreamRelay owner;
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private readonly string url;
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private readonly object gate = new();
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private readonly HashSet<Subscription> subscribers = new();
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private readonly Queue<byte[]> history = new();
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private int historyBytes;
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private CancellationTokenSource lifetime;
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private CancellationTokenSource idle;
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private Task pump;
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private TaskCompletionSource ready;
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private DateTime failedUntil;
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public string Id { get; } = Guid.NewGuid().ToString("N");
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public string ServiceReference => new Uri(url).AbsolutePath;
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public string LastError { get; private set; }
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public bool Active { get { lock (gate) return pump != null && !pump.IsCompleted; } }
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public int Consumers { get { lock (gate) return subscribers.Count; } }
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public Source(LiveStreamRelay owner, string url) { this.owner = owner; this.url = url; }
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public async Task<Subscription> Subscribe(CancellationToken token)
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{
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Subscription subscription; Task initial;
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lock (gate)
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{
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idle?.Cancel(); idle?.Dispose(); idle = null;
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if (subscribers.Count >= 16) throw new IOException("Channel consumer limit reached.");
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if (pump == null || pump.IsCompleted)
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{
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if (DateTime.UtcNow < failedUntil) throw new IOException("Decoder source is unavailable.");
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lifetime?.Dispose(); lifetime = new();
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history.Clear(); historyBytes = 0;
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ready = new(TaskCreationOptions.RunContinuationsAsynchronously);
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pump = Task.Run(() => Pump(lifetime.Token));
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}
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subscription = new(this); subscribers.Add(subscription);
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foreach (var chunk in history) subscription.Buffer.Writer.TryWrite(chunk);
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initial = ready.Task;
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}
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try { await initial.WaitAsync(TimeSpan.FromSeconds(12), token); return subscription; }
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catch { await subscription.DisposeAsync(); throw; }
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}
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public void Remove(Subscription subscription)
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{
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lock (gate)
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{
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if (!subscribers.Remove(subscription)) return;
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subscription.Buffer.Writer.TryComplete();
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if (subscribers.Count == 0 && pump != null && !pump.IsCompleted)
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{
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idle?.Cancel(); idle?.Dispose(); idle = new();
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var timer = idle.Token;
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var current = lifetime;
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_ = Task.Run(async () => {
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try { await Task.Delay(owner.idleGrace, timer); lock (gate) if (subscribers.Count == 0 && lifetime == current) current.Cancel(); }
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catch (OperationCanceledException) { }
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});
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}
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}
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}
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public void Stop() { lock (gate) { idle?.Cancel(); lifetime?.Cancel(); } }
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private async Task Pump(CancellationToken token)
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{
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Exception failure = null;
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try
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{
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using var opening = CancellationTokenSource.CreateLinkedTokenSource(token); opening.CancelAfter(TimeSpan.FromSeconds(5));
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Interlocked.Increment(ref owner.opened);
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using var response = await owner.client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, opening.Token);
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response.EnsureSuccessStatusCode();
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using var stream = await response.Content.ReadAsStreamAsync(token);
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var buffer = new byte[188 * 256 + 188]; var carry = 0;
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while (true)
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{
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using var reading = CancellationTokenSource.CreateLinkedTokenSource(token); reading.CancelAfter(TimeSpan.FromSeconds(8));
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var count = await stream.ReadAtLeastAsync(buffer.AsMemory(carry, buffer.Length - carry), 188 * 256 - carry, throwOnEndOfStream: false, cancellationToken: reading.Token);
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if (count == 0) throw new IOException("Decoder closed the live stream.");
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count += carry; var bytes = count / 188 * 188;
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if (bytes > 0)
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{
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if (buffer[0] != 0x47 || (bytes >= 376 && buffer[188] != 0x47)) throw new IOException("Decoder did not return MPEG-TS packets.");
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var chunk = buffer.AsSpan(0, bytes).ToArray();
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lock (gate)
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{
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history.Enqueue(chunk); historyBytes += bytes;
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while (historyBytes > 2 * 1024 * 1024) historyBytes -= history.Dequeue().Length;
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foreach (var subscriber in subscribers.ToArray())
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if (!subscriber.Buffer.Writer.TryWrite(chunk)) { subscriber.Buffer.Writer.TryComplete(new IOException("Slow live stream consumer.")); Remove(subscriber); }
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ready.TrySetResult();
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}
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}
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carry = count - bytes;
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if (carry > 0) System.Buffer.BlockCopy(buffer, bytes, buffer, 0, carry);
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}
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}
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catch (Exception error) { failure = error; }
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finally
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{
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lock (gate)
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{
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LastError = token.IsCancellationRequested ? null : failure?.Message;
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if (!token.IsCancellationRequested) failedUntil = DateTime.UtcNow.AddSeconds(3);
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ready.TrySetException(new IOException("Decoder stream unavailable.", failure));
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foreach (var subscriber in subscribers) subscriber.Buffer.Writer.TryComplete(failure);
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subscribers.Clear(); history.Clear(); historyBytes = 0;
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}
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}
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}
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}
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}
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[ApiController]
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[Route("DecoderIntegration/Live")]
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public sealed class LiveRelayController : ControllerBase
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{
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private readonly LiveStreamRelay relay;
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public LiveRelayController(LiveStreamRelay relay) { this.relay = relay; }
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[HttpGet("{id}")]
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[AllowAnonymous]
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public async Task Stream(string id, CancellationToken token)
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{
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var remote = HttpContext.Connection.RemoteIpAddress;
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if (remote == null || !(IPAddress.IsLoopback(remote) || (remote.IsIPv4MappedToIPv6 && IPAddress.IsLoopback(remote.MapToIPv4())))) { Response.StatusCode = 403; return; }
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try
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{
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await using var subscription = await relay.Subscribe(id, token);
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Response.ContentType = "video/mp2t"; Response.Headers.CacheControl = "no-store";
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await foreach (var chunk in subscription.Reader.ReadAllAsync(token))
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{ await Response.Body.WriteAsync(chunk, token); await Response.Body.FlushAsync(token); }
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}
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catch (OperationCanceledException) when (token.IsCancellationRequested) { }
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catch (Exception)
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{
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if (Response.HasStarted) HttpContext.Abort();
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else Response.StatusCode = 502;
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}
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}
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}
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