/// <summary>
/// Parses a given buffer of ID3 information into a readable Track object.
/// Called once per MP3 link.
/// </summary>
/// <param name="buffer">Data from the download process of the ID3 Tag</param>
/// <returns>Full Track object, either with data or NULL if error.</returns>
private static Track ParseID3(byte[] buffer)
{
Track m_Track = new Track();
try
{
byte[] bytes_ID3 = new byte[3];
Array.Copy(buffer, 0, bytes_ID3, 0, bytes_ID3.Length);
string ID3_Identifier = encoder.GetString(bytes_ID3);
if (ID3_Identifier == "ID3") //Basic Validation for misaligned/misformed headers.
{
uint count = 10;
while ((count+8) < buffer.Length)
{
byte[] frameData = new byte[8];
Array.Copy(buffer, count, frameData, 0, frameData.Length);
byte[] bytes_FrameID = new byte[4];
Array.Copy(frameData, 0, bytes_FrameID, 0, 4);
string frameID = encoder.GetString(bytes_FrameID).Trim('\0'); //GET THE FRAME NAME:
byte[] bytes_RawFrameSize = new byte[4];
Array.Copy(frameData, 4, bytes_RawFrameSize, 0, bytes_RawFrameSize.Length);
if (BitConverter.IsLittleEndian)
Array.Reverse(bytes_RawFrameSize);
uint frameSize = BitConverter.ToUInt32(bytes_RawFrameSize, 0);
if (frameID.Equals("TALB")) //Track Album Name
{
m_Track.Album = TryParseFrameData(buffer, count, frameSize);
}
else if (frameID.Equals("TIT1") || frameID.Equals("TIT2")) //Track Title
{
m_Track.Title = TryParseFrameData(buffer, count, frameSize);
}
else if (frameID.Equals("TPE1") || frameID.Equals("TPE2")) //Track Artist
{
m_Track.Artist = TryParseFrameData(buffer, count, frameSize);
}
//Increase count to the start of the next frame.
count += (frameSize + 10);
if (!(string.IsNullOrEmpty(m_Track.Album)) && !(string.IsNullOrEmpty(m_Track.Artist)) && !(string.IsNullOrEmpty(m_Track.Title)))
{
//EVERYTHING IS FULL.
return m_Track;
}
}
return null; //Completely parsed the buffer, nothing gained, failed? Yes.
}
else return null; //No valid ID3 Header Magic found. Failed.
}
catch (Exception ex)
{ Console.Write("ParseID3: {0}\n", ex.Message); return null; } //Just flat-out failed, log the reason for later fixing.
}
/// <summary>
/// Downloads the ID3 tag data from a given URI
/// Runs Syncronously, so should preferably used in conjun. with BackgroundWorker.DoWork()
/// </summary>
/// <param name="targetString">The target strings to download from.</param>
/// <returns>An array of all data.</returns>
public static List<Track> DownloadID3(List<string> targetStrings, int targetcount)
{
int bytecount = 1024;
List<Track> TrackObjects = new List<Track>();
Parallel.ForEach(targetStrings, (string targetString, ParallelLoopState loopState) =>
{
Track currentTrack = new Track();
WebRequest m_WebRequestHEAD = null;
WebRequest m_WebRequest = null;
try
{
m_WebRequestHEAD = (HttpWebRequest)WebRequest.Create(targetString);
m_WebRequestHEAD.Method = "HEAD";
m_WebRequestHEAD.Timeout = 2000;
m_WebRequest = (HttpWebRequest)WebRequest.Create(targetString);
m_WebRequest.Timeout = 2000;
}
catch (WebException ex) { Console.Write("WebException Caught: " + ex.Message); return; }
catch (UriFormatException ufi) { Console.Write("UriFormatException Caught: " + ufi.Message); return; }
WebResponse wResponseHEAD = null;
try { wResponseHEAD = m_WebRequestHEAD.GetResponse(); }
catch (WebException ex) { Console.WriteLine("WebException Caught: m_WebRequestHEAD.GetResponse()\n"+ex.Message); return; }
// Parse the content length to check for 'preview' or 'demo' files.
int cLen = 0;
if ((wResponseHEAD != null) && int.TryParse(wResponseHEAD.Headers.Get("Content-Length"), out cLen))
{ if (cLen < 1500000) { return; } }
wResponseHEAD.Close();
WebResponse wResponse = null;
try { wResponse = m_WebRequest.GetResponse(); }
catch (Exception ex) { Console.WriteLine("Exception Caught: m_WebRequest.GetResponse()\n"+ex.Message); return; }
using (var m_WebResponse = m_WebRequest.GetResponse().GetResponseStream())
{
byte[] buffer = new byte[bytecount];
m_WebResponse.Read(buffer, 0, bytecount);
//Get the ID3 Track Info
currentTrack = ParseID3(buffer);
if ((currentTrack != null) && (!currentTrack.Title.StartsWith("??")))
{
currentTrack.Link = targetString;
TrackObjects.Add(currentTrack);
}
}
});
return TrackObjects;
}
/// <summary>
/// Gets the selected row's MP3 Link and uses the WindowsMediaPlayer to play it.
/// </summary>
private void lst_TrackListView_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (lst_TrackListView.FocusedItem != null)
{
//Set the Now Playing Track to the current selected.
NowPlaying = new Track(lst_TrackListView.FocusedItem.SubItems[0].Text,
lst_TrackListView.FocusedItem.SubItems[1].Text,
lst_TrackListView.FocusedItem.SubItems[2].Text,
lst_TrackListView.FocusedItem.Tag.ToString());
LoadMedia(NowPlaying);
}
}
private void LoadMedia(Track newTrack)
{
//Load the track:
axWMP.currentMedia = axWMP.newMedia(newTrack.Link);
MediaState = PlayStates.Playing;
//Sort out any GUI settings required:
picPlayButton.Image = Properties.Resources.PauseButton;
lblNowPlaying.Text = NowPlaying.Title;
lblNowPlayingOther.Text = NowPlaying.Artist + " - " + NowPlaying.Album;
axWMP.Ctlcontrols.play();
}
/// <summary>
/// Loads a file containing Track data from a local file on cache.
/// </summary>
/// <param name="strSearchTerm"></param>
/// <returns></returns>
private List<Track> LoadCachedResult(string strSearchTerm)
{
strSearchTerm = strSearchTerm.Replace("/", "±");
string cachedResult = cacheDirectory + "\\" + strSearchTerm;
//If there's a cached result, and the Search Term isn't nothing:
if (File.Exists(cachedResult) && !String.IsNullOrEmpty(strSearchTerm))
{
try
{
List<Track> TrackList = new List<Track>();
//Load the cached Results from local disk:
using (StreamReader reader = new StreamReader(cachedResult, System.Text.Encoding.UTF8, false))
{
String trackline = reader.ReadLine();
while (trackline != null)
{
String[] trackitems = trackline.Split(';');
Track track = new Track(trackitems[0], trackitems[1], trackitems[2], trackitems[3]);
TrackList.Add(track);
trackline = reader.ReadLine();
}
return TrackList; //Got the cached result in a usable form!
}
}
catch (Exception) { return null; /*It wasn't formatted right? Get new.*/ }
}
else return null; //File either doesn't exist or has a blank search (so obviously non-existant)
}
private void changeMediaAfterLastOneFinishes()
{
//Long method name or longest method name?
//Either get the current Track if it's not the same (selected index changed)
//or get next(;;) next != current Track.
if (lst_TrackListView.FocusedItem != null)
{
Track lastTrack = NowPlaying;
int si = (int)lst_TrackListView.SelectedIndicies[0];
while (lst_TrackListView.Items[si].SubItems[0].Text == lastTrack.Title)
{
lst_TrackListView.Items[si].Selected = false;
si++;
lst_TrackListView.Items[si].Selected = true;
//Have we hit the last one? Should we go to the top?
if (si >= lst_TrackListView.Items.Count)
si = 0;
}
//Set the Now Playing Track to the current selected.
NowPlaying = new Track(lst_TrackListView.Items[si].SubItems[0].Text,
lst_TrackListView.Items[si].SubItems[1].Text,
lst_TrackListView.Items[si].SubItems[2].Text,
lst_TrackListView.Items[si].Tag.ToString());
LoadMedia(NowPlaying);
}
}
