/// <summary>
/// Returns a cover art image for the specified track.
/// </summary>
/// <param name="trackInfo">
/// An object contating data of currently playing track.
/// </param>
/// <param name="concreteRule">
/// A rule that should be used to search for cover art image.
/// </param>
/// <returns>Result of cover art image search.</returns>
public Bitmap GetBitmap(TrackInfo trackInfo, FindRule concreteRule)
{
Bitmap result = null;
var fileDir = Path.GetDirectoryName(trackInfo.FileName);
if (String.IsNullOrEmpty(fileDir))
{
return null;
}
var dir = new DirectoryInfo(fileDir);
String searchPattern;
if (concreteRule.Rule == CoverRuleType.AlbumFile)
{
searchPattern = trackInfo.Album + ".*";
}
else if (concreteRule.Rule == CoverRuleType.CoverFile)
{
searchPattern = "cover.*";
}
else
{
throw new NotSupportedException("The " + concreteRule.Rule + " rule cannot be handled by this method.");
}
// In case the pattern is not correct for the file system, do not proceed further.
if (Core.Algorithms.ContainsInvalidFileNameChars(searchPattern))
{
return null;
}
var covers = dir.GetFiles(searchPattern, SearchOption.TopDirectoryOnly);
if (covers.Length > 0)
{
foreach (var cover in covers)
{
Debug.WriteLine(String.Format("Loading image from HDD : {0}", cover.Name));
var ms = new MemoryStream(File.ReadAllBytes(cover.FullName));
try
{
result = (Bitmap)Image.FromStream(ms);
break;
}
catch (ArgumentException)
{
// Means that this is not an image or this format is not supported.
ms.Dispose();
}
}
}
return result;
}
/// <summary>
/// Being in a separate thread, this method uses find rules one by one
/// and tries to load the cover image.
/// </summary>
/// <param name="initialRequestId">An identifier of current search session.</param>
private Bitmap LoadImageWorkItem(Object initialRequestId, CancellationToken token)
{
Bitmap result = null;
// Make a pre-check that this request is really needed.
if ((Guid)initialRequestId != _currentRequestId)
{
return null;
}
try
{
_logger.Write(string.Format("Album: {0};\tArtist: {1};\tTrack: {2}", _aimpPlayer.CurrentFileInfo.Album, _aimpPlayer.CurrentFileInfo.Artist, _aimpPlayer.CurrentFileInfo.FileName));
// This object prevents race conditions when the search
// is in progress and at the same time AIMP is changing a track.
var trackInfo = new TrackInfo(_aimpPlayer);
var enabledRules = Config.Instance.Rules.Where(r => r.Enabled).ToArray();
for (Int32 i = 0; i < enabledRules.Length; i++)
{
if (token.IsCancellationRequested)
{
return null;
}
FindRule rule;
String moduleName;
// If it is a local audio file - use ordinary set of rules.
if (!trackInfo.IsStream)
{
rule = enabledRules.Skip(i).FirstOrDefault();
Contract.Assume(rule != null);
moduleName = rule.Module;
}
//If it is a CDA or a radio station - only LastFm can help us.
else
{
// If Last.Fm is disabled - stop iterating, we can't get the cover image.
if (!enabledRules.Any(r => r.Module == LastFmFinder.ModuleName))
{
break;
}
i = enabledRules.Length; // Prevent further iterations.
rule = null;
moduleName = LastFmFinder.ModuleName;
}
ICoverFinder finder = CoverModules.FirstOrDefault(c => c.Name == moduleName);
if (finder == null)
{
throw new ApplicationException("Finder plugin " + moduleName + " has not been found.");
}
result = finder.GetBitmap(_aimpPlayer, rule);
if (result != null)
{
_logger.Write(string.Format("Module: {0}\tCover art has been found", moduleName));
break;
}
{
_logger.Write(string.Format("Module: {0}\tCover art has not been found", moduleName));
}
}
_logger.Write("------------------------------------------------------");
}
catch (Exception ex)
{
#if DEBUG
MessageBox.Show(
LocalizedData.ErrorOnCoverImageSearch + ex.Message,
LocalizedData.PluginName,
MessageBoxButton.OK,
MessageBoxImage.Error);
#endif
}
return result;
}