public void UpdateSubset(WebData webData, long subsetID = 0, string name = null)
{
MDBSubset subset;
if (subsetID <= 0)
{
subset = new MDBSubset()
{
ID = CaveSystemData.CalculateID(name), Name = name,
};
subset.ID = mdb.Subsets.Insert(subset);
}
else
{
subset = mdb.Subsets.TryGetStruct(subsetID);
if (subset.ID == 0)
{
throw new WebServerException(WebError.DatasetMissing, 0, "Subset does not exist!");
}
if (name != null)
{
subset.Name = name;
}
mdb.Subsets.Replace(subset);
}
mdb.Save();
GetSubsetList(webData);
GetSubsetFilterList(webData, subset.ID);
}
/// <summary>Selects the next file.</summary>
/// <param name="streamID">The stream identifier.</param>
/// <returns>Returns true on success, false otherwise</returns>
public MDBFileSelection SelectNextFile(long streamID)
{
var config = mdb.GetStreamSettings(streamID);
MDBSubset subset = mdb.Subsets.TryGetStruct(config.SubsetID);
if (subset.ID == 0)
{
subset.Name = "Undefined";
}
int seqNumber = mdb.Subsets.SequenceNumber ^ mdb.SubsetFilters.SequenceNumber ^ mdb.AudioFiles.SequenceNumber;
if (audioFileIDs == null || seqNumber != sequenceNumber)
{
audioFileIDs = mdb.GetSubsetAudioFileIDs(subset.ID, config.MinimumLength, config.MaximumLength);
if (subset.TitleCount != audioFileIDs.Count)
{
subset.TitleCount = audioFileIDs.Count;
if (subset.ID > 0)
{
mdb.Subsets.Update(subset);
}
}
sequenceNumber = seqNumber;
this.LogInfo("Reloaded subset {0} at player", subset);
}
if (subset.ID > 0 && subset.TitleCount != audioFileIDs.Count)
{
subset.TitleCount = audioFileIDs.Count;
try
{
mdb.Subsets.Update(subset);
this.LogInfo("Subset {0} title count updated!", subset);
}
catch { }
}
if (audioFileIDs.Count == 0)
{
this.LogDebug("No subset defined or subset result empty for stream <red>{0}<default> selecting random titles.", streamID);
audioFileIDs = mdb.AudioFiles.IDs;
}
if (audioFileIDs.Count == 0)
{
this.LogDebug("No audio files found!");
Selection = null;
return(null);
}
var listSearch = Search.FieldEquals(nameof(MDBPlayListItem.StreamID), streamID);
while (true)
{
Func <long> getCount = () => mdb.PlayListItems.Count(listSearch);
//fill playlist
for (int n = 0; getCount() < config.MinimumTitleCount; n++)
{
//max 4 tries per slot
if (n > config.MinimumTitleCount * 4)
{
break;
}
int i = (int)((rnd.Next() * (long)rnd.Next()) % audioFileIDs.Count);
long nextID = audioFileIDs[i];
//audiofile valid ?
MDBAudioFile audioFile;
if (!mdb.AudioFiles.TryGetStruct(nextID, out audioFile))
{
continue;
}
//file does not exist
if (!File.Exists(mdb.Files.TryGetStruct(audioFile.FileID).GetFullPath(mdb)))
{
mdb.AudioFiles.TryDelete(audioFile.FileID);
mdb.Files.TryDelete(audioFile.FileID);
this.LogError("AudioFile <red>{0}<default> removed (inaccessible).", audioFile);
continue;
}
//yes, playlist contains id already ?
if (mdb.PlayListItems.Exist(listSearch & Search.FieldEquals(nameof(MDBPlayListItem.AudioFileID), nextID)))
{
continue;
}
//no add
mdb.PlayListItems.Insert(new MDBPlayListItem()
{
AudioFileID = audioFile.FileID,
StreamID = streamID,
SubsetID = subset.ID,
Added = DateTime.UtcNow.AddTicks(DefaultRNG.Int8),
});
this.LogInfo("Added audio file {0} from subset {1} to {2} playlist.", audioFile, subset, streamID);
}
mdb.Save();
//get current entry
try
{
var items = mdb.PlayListItems.GetStructs(
listSearch & Search.FieldGreater(nameof(MDBPlayListItem.OwnerID), 0),
ResultOption.SortAscending(nameof(MDBPlayListItem.Added)) + ResultOption.Limit(1));
if (items.Count == 0)
{
items = mdb.PlayListItems.GetStructs(
listSearch & Search.FieldEquals(nameof(MDBPlayListItem.OwnerID), 0),
ResultOption.SortAscending(nameof(MDBPlayListItem.Added)) + ResultOption.Limit(1));
}
var item = items.FirstOrDefault();
if (item.ID == 0)
{
continue;
}
try
{
var result = Selection = MDBFileSelection.Load(mdb, item);
return(result);
}
finally
{
//always remove playlistitem (even on errors)
mdb.PlayListItems.TryDelete(item.ID);
}
}
catch (Exception ex)
{
this.LogError(ex, "Cannot start stream {0}!", streamID, ex.Message);
Selection = null;
return(null);
}
}
}
