update tuner host interface

Emby.Server.Implementations/LiveTv/TunerHosts/BaseTunerHost.cs

@@ -135,8 +135,7 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
                     {
                         // Check to make sure the tuner is available
                         // If there's only one tuner, don't bother with the check and just let the tuner be the one to throw an error
-                        if (hostsWithChannel.Count > 1 &&
+                        if (hostsWithChannel.Count > 1 && !await IsAvailable(host, channelId, cancellationToken).ConfigureAwait(false))
-                            !await IsAvailable(host, channelId, cancellationToken).ConfigureAwait(false))
                         {
                             Logger.Error("Tuner is not currently available");
                             continue;
@@ -208,6 +207,11 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
             foreach (var host in hostsWithChannel)
             {
+                if (!channelId.StartsWith(ChannelIdPrefix, StringComparison.OrdinalIgnoreCase))
+                {
+                    continue;
+                }
+
                 try
                 {
                     var liveStream = await GetChannelStream(host, channelId, streamId, cancellationToken).ConfigureAwait(false);
@@ -243,7 +247,22 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
 
         protected abstract Task<bool> IsAvailableInternal(TunerHostInfo tuner, string channelId, CancellationToken cancellationToken);
 
-        protected abstract bool IsValidChannelId(string channelId);
+        protected virtual string ChannelIdPrefix
+        {
+            get
+            {
+                return Type + "_";
+            }
+        }
+        protected virtual bool IsValidChannelId(string channelId)
+        {
+            if (string.IsNullOrWhiteSpace(channelId))
+            {
+                throw new ArgumentNullException("channelId");
+            }
+
+            return channelId.StartsWith(ChannelIdPrefix, StringComparison.OrdinalIgnoreCase);
+        }
 
         protected LiveTvOptions GetConfiguration()
         {

Emby.Server.Implementations/LiveTv/TunerHosts/HdHomerun/HdHomerunHost.cs

@@ -56,7 +56,13 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             get { return "hdhomerun"; }
         }
 
-        private const string ChannelIdPrefix = "hdhr_";
+        protected override string ChannelIdPrefix
+        {
+            get
+            {
+                return "hdhr_";
+            }
+        }
 
         private string GetChannelId(TunerHostInfo info, Channels i)
         {
@@ -559,26 +565,12 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts.HdHomerun
             return list;
         }
 
-        protected override bool IsValidChannelId(string channelId)
-        {
-            if (string.IsNullOrWhiteSpace(channelId))
-            {
-                throw new ArgumentNullException("channelId");
-            }
-
-            return channelId.StartsWith(ChannelIdPrefix, StringComparison.OrdinalIgnoreCase);
-        }
-
         protected override async Task<LiveStream> GetChannelStream(TunerHostInfo info, string channelId, string streamId, CancellationToken cancellationToken)
         {
             var profile = streamId.Split('_')[0];
 
             Logger.Info("GetChannelStream: channel id: {0}. stream id: {1} profile: {2}", channelId, streamId, profile);
 
-            if (!channelId.StartsWith(ChannelIdPrefix, StringComparison.OrdinalIgnoreCase))
-            {
-                throw new ArgumentException("Channel not found");
-            }
             var hdhrId = GetHdHrIdFromChannelId(channelId);
 
             var channels = await GetChannels(info, true, CancellationToken.None).ConfigureAwait(false);

Emby.Server.Implementations/LiveTv/TunerHosts/M3UTunerHost.cs

@@ -46,8 +46,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             get { return "M3U Tuner"; }
         }
 
-        private const string ChannelIdPrefix = "m3u_";
-
         protected override async Task<List<ChannelInfo>> GetChannelsInternal(TunerHostInfo info, CancellationToken cancellationToken)
         {
             var result = await new M3uParser(Logger, _fileSystem, _httpClient, _appHost).Parse(info.Url, ChannelIdPrefix, info.Id, !info.EnableTvgId, cancellationToken).ConfigureAwait(false);
@@ -87,16 +85,6 @@ namespace Emby.Server.Implementations.LiveTv.TunerHosts
             }
         }
 
-        protected override bool IsValidChannelId(string channelId)
-        {
-            if (string.IsNullOrWhiteSpace(channelId))
-            {
-                throw new ArgumentNullException("channelId");
-            }
-
-            return channelId.StartsWith(ChannelIdPrefix, StringComparison.OrdinalIgnoreCase);
-        }
-
         protected override async Task<List<MediaSourceInfo>> GetChannelStreamMediaSources(TunerHostInfo info, string channelId, CancellationToken cancellationToken)
         {
             var urlHash = info.Url.GetMD5().ToString("N");