diff options
Diffstat (limited to 'Emby.Server.Implementations/SyncPlay')
| -rw-r--r-- | Emby.Server.Implementations/SyncPlay/Group.cs | 18 | ||||
| -rw-r--r-- | Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs | 13 |
2 files changed, 24 insertions, 7 deletions
diff --git a/Emby.Server.Implementations/SyncPlay/Group.cs b/Emby.Server.Implementations/SyncPlay/Group.cs index 38a0018a70..923bfc67aa 100644 --- a/Emby.Server.Implementations/SyncPlay/Group.cs +++ b/Emby.Server.Implementations/SyncPlay/Group.cs @@ -91,6 +91,18 @@ namespace Emby.Server.Implementations.SyncPlay public long DefaultPing { get; } = 500; /// <summary> + /// Gets the maximum ping, in milliseconds, accepted from a session. + /// </summary> + /// <remarks> + /// Pings are reported by clients and are scaled into the delays used to schedule playback, + /// so an unbounded value lets a single session push the whole group's resume point + /// arbitrarily far out, or overflow the arithmetic entirely. Anything above this is not a + /// usable measurement for synchronisation. + /// </remarks> + /// <value>The maximum ping.</value> + public long MaxPing { get; } = 10000; + + /// <summary> /// Gets the maximum time offset error accepted for dates reported by clients, in milliseconds. /// </summary> /// <value>The maximum time offset error.</value> @@ -438,7 +450,7 @@ namespace Emby.Server.Implementations.SyncPlay { if (_participants.TryGetValue(session.Id, out GroupMember value)) { - value.Ping = ping; + value.Ping = Math.Clamp(ping, 0, MaxPing); } } @@ -451,7 +463,9 @@ namespace Emby.Server.Implementations.SyncPlay max = Math.Max(max, session.Ping); } - return max; + // A group with no participants has no ping to report. Returning long.MinValue would + // overflow the callers that scale this value into ticks, so fall back to the default. + return max == long.MinValue ? DefaultPing : max; } /// <inheritdoc /> diff --git a/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs b/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs index b45d754554..b88ee33358 100644 --- a/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs +++ b/Emby.Server.Implementations/SyncPlay/SyncPlayManager.cs @@ -181,8 +181,8 @@ namespace Emby.Server.Implementations.SyncPlay { if (existingGroup.GroupId.Equals(request.GroupId)) { - // Restore session. - UpdateSessionsCounter(session.UserId, 1); + // Restore session. The session is already in the group and has already + // been counted, so the counter must not be incremented a second time. group.SessionJoin(session, request, cancellationToken); return; } @@ -332,8 +332,11 @@ namespace Emby.Server.Implementations.SyncPlay // Group lock required as Group is not thread-safe. lock (group) { - // Make sure that session still belongs to this group. - if (_sessionToGroupMap.TryGetValue(session.Id, out var checkGroup) && !checkGroup.GroupId.Equals(group.GroupId)) + // Make sure that session still belongs to this group. The lookup can fail + // outright when the session left while this request was waiting on the group + // lock, which is exactly the case this re-check exists to catch. + if (!_sessionToGroupMap.TryGetValue(session.Id, out var checkGroup) + || !checkGroup.GroupId.Equals(group.GroupId)) { // Drop request. return; @@ -400,7 +403,7 @@ namespace Emby.Server.Implementations.SyncPlay // Update sessions counter. var newSessionsCounter = _activeUsers.AddOrUpdate( userId, - 1, + toAdd, (_, sessionsCounter) => sessionsCounter + toAdd); // Should never happen. |