HDHomeRun - Fix incorrect starting offset of buffer span in CheckTunerAvailability.

[swedishborgie]

CheckTunerAvailability creates a span from a buffer to pass to the validation function. It appears to be incorrectly using the length as the starting index which is causing the tuner initialization to fail. Fixing this resolved the issue I was having with my HDHR3-US.

Please let me if you would like any additional changes or testing done.

Fixes #7154

[Bond-009]

Thx, looks like I messed that up almost 2years ago

[Bond-009]

@swedishborgie could you dump the response of your tuner so I can write a regression test for this?

[swedishborgie]

Sure thing! I've attached a dump of the response going into the verify for CheckTunerAvailability(). Here's the response from a HDHR3-US:

tuner_lockkey.txt

[GodlyOverlord]

Hi

I've got a HDHR3-DT tuner thats throwing the same livetvconflictexception errors when attempting to loading a livetv stream.
Unit is latest firmware and my jellyfin install is a brand new fresh Docker install on 10.8.8

Any channel i attempt to start, it throws
[2023-01-06 22:57:54.862 +11:00] [INF] [21] Emby.Server.Implementations.LiveTv.LiveTvManager: Opening channel stream from "Emby", external channel Id: "hdhr_26" [2023-01-06 22:57:54.862 +11:00] [INF] [21] Emby.Server.Implementations.LiveTv.EmbyTV.EmbyTV: Streaming Channel "hdhr_26" [2023-01-06 22:57:54.862 +11:00] [INF] [21] Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun.HdHomerunHost: GetChannelStream: channel id: "hdhr_26". stream id: "native_bc93a813083fd27724af0d73de3f0359_3c030cd34cf84e59e94182fe6c2f1b7b" profile: "native" [2023-01-06 22:57:54.863 +11:00] [INF] [21] Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun.HdHomerunHost: Opening HDHR UDP Live stream from "192.168.1.213" [2023-01-06 22:57:54.899 +11:00] [ERR] [21] Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun.HdHomerunHost: Error opening live stream: MediaBrowser.Controller.LiveTv.LiveTvConflictException: Exception of type 'MediaBrowser.Controller.LiveTv.LiveTvConflictException' was thrown.

[cvium]

But this PR isn't in 10.8