public static void readMP3Tag(ref MP3 paramMP3)
{
// Read the 128 byte ID3 tag into a byte array
FileStream oFileStream;
oFileStream = new FileStream(paramMP3.fileComplete, FileMode.Open);
byte[] bBuffer = new byte[128];
oFileStream.Seek(-128, SeekOrigin.End);
oFileStream.Read(bBuffer, 0, 128);
oFileStream.Close();
// Convert the Byte Array to a String
Encoding instEncoding = new ASCIIEncoding(); // NB: Encoding is an Abstract class
string id3Tag = instEncoding.GetString(bBuffer);
// If there is an attched ID3 v1.x TAG then read it
if (id3Tag.Substring(0, 3) == "TAG")
{
paramMP3.id3Title = id3Tag.Substring(3, 30).Trim();
paramMP3.id3Artist = id3Tag.Substring(33, 30).Trim();
paramMP3.id3Album = id3Tag.Substring(63, 30).Trim();
paramMP3.id3Year = id3Tag.Substring(93, 4).Trim();
paramMP3.id3Comment = id3Tag.Substring(97, 28).Trim();
// Get the track number if TAG conforms to ID3 v1.1
if (id3Tag[125] == 0)
{
paramMP3.id3TrackNumber = bBuffer[126];
}
else
{
paramMP3.id3TrackNumber = 0;
}
paramMP3.id3Genre = bBuffer[127];
paramMP3.hasID3Tag = true;
// ********* IF USED IN ANGER: ENSURE to test for non-numeric year
}
else
{
// ID3 Tag not found so create an empty TAG in case the user saces later
paramMP3.id3Title = "";
paramMP3.id3Artist = "";
paramMP3.id3Album = "";
paramMP3.id3Year = "";
paramMP3.id3Comment = "";
paramMP3.id3TrackNumber = 0;
paramMP3.id3Genre = 0;
paramMP3.hasID3Tag = false;
}
}
public static void updateMP3Tag(ref MP3 paramMP3)
{
// Trim any whitespace
paramMP3.id3Title = paramMP3.id3Title.Trim();
paramMP3.id3Artist = paramMP3.id3Artist.Trim();
paramMP3.id3Album = paramMP3.id3Album.Trim();
paramMP3.id3Year = paramMP3.id3Year.Trim();
paramMP3.id3Comment = paramMP3.id3Comment.Trim();
// Ensure all properties are correct size
if (paramMP3.id3Title.Length > 30)
{
paramMP3.id3Title = paramMP3.id3Title.Substring(0, 30);
}
if (paramMP3.id3Artist.Length > 30)
{
paramMP3.id3Artist = paramMP3.id3Artist.Substring(0, 30);
}
if (paramMP3.id3Album.Length > 30)
{
paramMP3.id3Album = paramMP3.id3Album.Substring(0, 30);
}
if (paramMP3.id3Year.Length > 4)
{
paramMP3.id3Year = paramMP3.id3Year.Substring(0, 4);
}
if (paramMP3.id3Comment.Length > 28)
{
paramMP3.id3Comment = paramMP3.id3Comment.Substring(0, 28);
}
// Build a new ID3 Tag (128 Bytes)
byte[] tagByteArray = new byte[128];
for (int i = 0; i < tagByteArray.Length; i++)
{
tagByteArray[i] = 0; // Initialise array to nulls
}
// Convert the Byte Array to a String
Encoding instEncoding = new ASCIIEncoding(); // NB: Encoding is an Abstract class // ************ To DO: Make a shared instance of ASCIIEncoding so we don't keep creating/destroying it
// Copy "TAG" to Array
byte[] workingByteArray = instEncoding.GetBytes("TAG");
Array.Copy(workingByteArray, 0, tagByteArray, 0, workingByteArray.Length);
// Copy Title to Array
workingByteArray = instEncoding.GetBytes(paramMP3.id3Title);
Array.Copy(workingByteArray, 0, tagByteArray, 3, workingByteArray.Length);
// Copy Artist to Array
workingByteArray = instEncoding.GetBytes(paramMP3.id3Artist);
Array.Copy(workingByteArray, 0, tagByteArray, 33, workingByteArray.Length);
// Copy Album to Array
workingByteArray = instEncoding.GetBytes(paramMP3.id3Album);
Array.Copy(workingByteArray, 0, tagByteArray, 63, workingByteArray.Length);
// Copy Year to Array
workingByteArray = instEncoding.GetBytes(paramMP3.id3Year);
Array.Copy(workingByteArray, 0, tagByteArray, 93, workingByteArray.Length);
// Copy Comment to Array
workingByteArray = instEncoding.GetBytes(paramMP3.id3Comment);
Array.Copy(workingByteArray, 0, tagByteArray, 97, workingByteArray.Length);
// Copy Track and Genre to Array
tagByteArray[126] = paramMP3.id3TrackNumber;
tagByteArray[127] = paramMP3.id3Genre;
// SAVE TO DISK: Replace the final 128 Bytes with our new ID3 tag
FileStream oFileStream = new FileStream(paramMP3.fileComplete, FileMode.Open);
if (paramMP3.hasID3Tag)
{
oFileStream.Seek(-128, SeekOrigin.End);
}
else
{
oFileStream.Seek(0, SeekOrigin.End);
}
oFileStream.Write(tagByteArray, 0, 128);
oFileStream.Close();
paramMP3.hasID3Tag = true;
}
