public async Task SetMetaData(string fileName, IEnumerable <MetaDataItem> metaData, Func <MetaDataItem, bool> predicate)
{
if (MetaDataBehaviourConfiguration.GetWriteBehaviour(this.Write.Value) == WriteBehaviour.None)
{
Logger.Write(this, LogLevel.Warn, "Writing is disabled: {0}", fileName);
return;
}
if (!this.IsSupported(fileName))
{
Logger.Write(this, LogLevel.Warn, "Unsupported file format: {0}", fileName);
return;
}
var metaDataItems = default(IEnumerable <MetaDataItem>);
lock (metaData)
{
if (predicate != null)
{
metaDataItems = metaData.Where(predicate).ToArray();
}
else
{
metaDataItems = metaData.ToArray();
}
if (!metaDataItems.Any())
{
//Nothing to update.
return;
}
}
var collect = default(bool);
using (var file = this.FileFactory.Create(fileName))
{
if (file.PossiblyCorrupt)
{
this.AddWarnings(fileName, file.CorruptionReasons);
}
foreach (var metaDataItem in metaDataItems)
{
switch (metaDataItem.Type)
{
case MetaDataItemType.Tag:
this.SetTag(metaDataItem, file);
break;
case MetaDataItemType.Image:
if (file.InvariantStartPosition > MAX_TAG_SIZE)
{
collect = true;
}
await ImageManager.Write(this, metaDataItem, file).ConfigureAwait(false);
break;
case MetaDataItemType.Document:
if (this.Documents.Value)
{
DocumentManager.Write(this, metaDataItem, file);
}
break;
}
}
if (file is IMetaDataSource metaDataSource)
{
await this.SetAdditional(metaData, file, metaDataSource).ConfigureAwait(false);
}
file.Save();
}
if (collect)
{
//If we encountered a large meta data section (>10MB) then we need to try to reclaim the memory.
GC.Collect();
}
}
public async Task <IEnumerable <MetaDataItem> > GetMetaData(string fileName, Func <File> factory)
{
if (!this.IsSupported(fileName))
{
Logger.Write(this, LogLevel.Warn, "Unsupported file format: {0}", fileName);
this.AddWarning(fileName, "Unsupported file format.");
return(Enumerable.Empty <MetaDataItem>());
}
var collect = default(bool);
var metaData = new List <MetaDataItem>();
Logger.Write(this, LogLevel.Trace, "Reading meta data for file: {0}", fileName);
try
{
using (var file = factory())
{
if (file.PossiblyCorrupt)
{
this.AddWarnings(fileName, file.CorruptionReasons);
}
if (file.InvariantStartPosition > MAX_TAG_SIZE)
{
collect = true;
}
if (file.Tag != null)
{
this.AddTags(metaData, file.Tag);
}
if (file.Properties != null)
{
this.AddProperties(metaData, file.Properties);
}
if (this.Popularimeter.Value)
{
this.Try(() => PopularimeterManager.Read(this, metaData, file), this.ErrorHandler);
}
if (this.ReplayGain.Value)
{
this.Try(() => ReplayGainManager.Read(this, metaData, file), this.ErrorHandler);
}
if (this.Documents.Value)
{
this.Try(() => DocumentManager.Read(this, metaData, file), this.ErrorHandler);
}
this.Try(() => CompilationManager.Read(this, metaData, file), this.ErrorHandler);
if (file is IMetaDataSource metaDataSource)
{
await this.AddAdditional(metaData, file, metaDataSource).ConfigureAwait(false);
}
await ImageManager.Read(this, metaData, file).ConfigureAwait(false);
}
}
catch (UnsupportedFormatException)
{
Logger.Write(this, LogLevel.Warn, "Unsupported file format: {0}", fileName);
this.AddWarning(fileName, "Unsupported file format.");
}
catch (OutOfMemoryException)
{
//This can happen with really big embedded images.
//It's tricky to avoid because we can't check InvariantStartPosition without parsing.
Logger.Write(this, LogLevel.Warn, "Out of memory: {0}", fileName);
this.AddWarning(fileName, "Out of memory.");
collect = true;
}
catch (Exception e)
{
Logger.Write(this, LogLevel.Warn, "Failed to read meta data: {0} => {1}", fileName, e.Message);
this.AddWarning(fileName, string.Format("Failed to read meta data: {0}", e.Message));
}
finally
{
if (collect)
{
//If we encountered a large meta data section (>10MB) then we need to try to reclaim the memory.
GC.Collect();
}
}
return(metaData);
}
