/// <summary>
/// Reads Lyrics3 tag in Mp3 format
/// </summary>
public static void ReadLyrics3Tag()
{
try
{
//ExStart:ReadLayrics3TagInMp3
// initialize Mp3Format class
using (Mp3Format mp3Format = new Mp3Format((Common.MapSourceFilePath(filePath))))
{
// get Lyrics3 v2.00 tag
Lyrics3Tag lyrics3Tag = mp3Format.Lyrics3v2;
// check if Lyrics3 is presented. It could be absent.
if (lyrics3Tag != null)
{
// Display defined tag values
Console.WriteLine("Album: {0}", lyrics3Tag.Album);
Console.WriteLine("Artist: {0}", lyrics3Tag.Artist);
Console.WriteLine("Track: {0}", lyrics3Tag.Track);
// get all fields presented in Lyrics3Tag
Lyrics3Field[] allFields = lyrics3Tag.Fields;
foreach (Lyrics3Field lyrics3Field in allFields)
{
Console.WriteLine("Name: {0}, value: {1}", lyrics3Field.Name, lyrics3Field.Value);
}
}
}
//ExEnd:ReadLayrics3TagInMp3
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
/// <summary>
/// Update Lyrics3 Tag by replacing whole tag
/// This method is supportd by version 18.10 or greater.
/// </summary>
public static void UpdateLyrics3TagByReplacingWholeTag()
{
using (Mp3Format format = new Mp3Format(Common.MapSourceFilePath(filePath)))
{
Lyrics3Tag tag = new Lyrics3Tag();
tag.Fields = new Lyrics3Field[]
{
new Lyrics3Field("EAL", "test album"),
new Lyrics3Field("EAR", "test artist"),
new Lyrics3Field("INF", "test info"),
new Lyrics3Field("LYR", "[00:01] test lyrics"),
};
format.UpdateLyrics3v2(tag);
format.Save(Common.MapDestinationFilePath(filePath));
}
}
public APEv2Tag(FileStream fs, ID3v1Tag id3v1, Lyrics3Tag lyrics3, bool afterAudioData)
{
Appended = false;
Exists = false;
Valid = false;
long lngOffset = 32; //Size of footer tag of APEv2
if (id3v1.Exists)
{
lngOffset += id3v1.TagSize; //128 Bytes for ID3v1
}
if (lyrics3.Exists)
{
lngOffset += lyrics3.TagSize;
}
RawFooter = new byte[32];
fs.Position = fs.Length - lngOffset;
fs.Read(RawFooter, 0, 32);
if (Encoding.ASCII.GetString(RawFooter, 0, 8) == "APETAGEX")
{
Exists = true;
Appended = true;
//Version
uint v = ID3Base.expand(RawFooter[11], RawFooter[10], RawFooter[9], RawFooter[8]);
TagSize = ID3Base.expand(RawFooter[15], RawFooter[14], RawFooter[13], RawFooter[12]);
uint numOfItems = ID3Base.expand(RawFooter[19], RawFooter[18], RawFooter[17], RawFooter[16]);
//Detect Header
fs.Position = fs.Length - (lngOffset + TagSize);
RawHeader = new byte[32];
fs.Read(RawHeader, 0, 32);
if (Encoding.ASCII.GetString(RawHeader, 0, 8) == "APETAGEX")
{
//WERE GOOD
ProcessFlags();
}
}
}
public MP3(string FileName)
{
Console.WriteLine(FileName);
FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read);
Valid = false;
// Set the filename not including the path information
strFileName = @fs.Name;
char[] chrSeparators = new char[] { '\\', '/' };
string[] strSeparator = strFileName.Split(chrSeparators);
int intUpper = strSeparator.GetUpperBound(0);
strFileName = strSeparator[intUpper];
// Replace ' with '' for the SQL INSERT statement
strFileName = strFileName.Replace("'", "''");
// Set the file size
lngFileSize = fs.Length;
byte[] bytHeader = new byte[4];
byte[] bytVBitRate = new byte[12];
int intPos = 0;
// Keep reading 4 bytes from the header until we know for sure that in
// fact it's an MP3
int nextFrame = 0; //Jeff - Location in stream to next Frame (current position + framesize)
//Read if id3v1 exists
id3v1 = new ID3v1Tag(fs);
//Read if id3v2 exists
id3v2 = new ID3v2Tag(fs);
//Read if lyrics3 exists
lyrics3 = new Lyrics3Tag(fs, id3v1.Exists);
//Read if APEv2 exists
apev2 = new APEv2Tag(fs, id3v1, lyrics3, true);
//Pass up the ID3v2 tag (if it exists)
if (id3v2.Exists)
{
if (!id3v2.FooterExists)
{
intPos = (int)id3v2.TagSize + 10; //+10 for header
}
else
{
intPos = (int)id3v2.TagSize + 20; //+20 for header and footer
}
}
fs.Position = intPos;
fs.Read(bytHeader, 0, 4);
MPEGAudioFrame temp = new MPEGAudioFrame(bytHeader, 0);
if (temp.Valid == false)
{
if (Encoding.ASCII.GetString(bytHeader, 0, 3) == "ID3")
{
//Another ID3v2 Tag?
Console.WriteLine("Another ID3v2 tag was found after the initial one");
Console.WriteLine();
}
else if (Encoding.ASCII.GetString(bytHeader, 0, 3) == "APE")
{
//APETAGEX has appeared before audio data
Console.WriteLine("APEv2 Tag Found after ID3v2 tag");
Console.WriteLine();
}
else
{
//Unknown - Somthing is here that is not supposed to be
Console.WriteLine("Garbage found after ID3v2 tag");
Console.WriteLine();
}
}
//ID3v2 Tag was not valid, so the reported size may not be the actual size. Search backwards to try and find the first mpeg audio frame.
if (!id3v2.Valid)
{
//Search Backwards (Max Search 16384)
int intPosPrev = intPos;
int maxPos = intPos - 16384;
if (maxPos < 0)
{
maxPos = 0;
}
do
{
fs.Position = intPos;
fs.Read(bytHeader, 0, 4);
firstFrame = new MPEGAudioFrame(bytHeader, intPos);
if (firstFrame.Valid)
{
nextFrame = intPos + firstFrame.FrameSize;
fs.Position = nextFrame;
bytHeader = new byte[4]; //Reset bytHeader array
fs.Read(bytHeader, 0, 4);
MPEGAudioFrame SecondHeader = new MPEGAudioFrame(bytHeader, nextFrame);
if (SecondHeader.Valid)
{
Valid = true;
break;
}
else
{
//The next frame did not appear valid - reset stream position
fs.Position = intPos;
}
}
intPos--;
} while (!Valid && (fs.Position >= maxPos) && intPos >= 0);
if (!Valid)
{
intPos = intPosPrev;
}
}
//Search Forwards
do
{
fs.Position = intPos;
fs.Read(bytHeader, 0, 4);
firstFrame = new MPEGAudioFrame(bytHeader, intPos);
if (firstFrame.Valid)
{
nextFrame = intPos + firstFrame.FrameSize;
fs.Position = nextFrame;
bytHeader = new byte[4]; //Reset bytHeader array
fs.Read(bytHeader, 0, 4);
MPEGAudioFrame SecondHeader = new MPEGAudioFrame(bytHeader, nextFrame);
if (SecondHeader.Valid)
{
Valid = true;
break;
}
else
{
//The next frame did not appear valid - reset stream position
fs.Position = intPos;
}
}
intPos++;
}while (!Valid && (fs.Position != fs.Length));
// If the current file stream position is equal to the length,
// that means that we've read the entire file and it's not a valid MP3 file
if (Valid && (fs.Position != fs.Length))
{
intPos += 4; //Bypass the 4 byte header
//The following is retrieved from XING SDK //http://www.mp3-tech.org/programmer/decoding.html
if (firstFrame.getVersion() == 1.0) //MPEG Version 1
{
if (firstFrame.ChannelModeIndex == 3) //Single Channel (Mono)
{
intPos += 17;
}
else
{
intPos += 32;
}
}
else //MPEG Version 2.0 or 2.5
{
if (firstFrame.ChannelModeIndex == 3) //Single Channel (Mono)
{
intPos += 9;
}
else
{
intPos += 17;
}
}
// Check to see if the MP3 has a variable bitrate
fs.Position = intPos;
//fs.Read(bytVBitRate,0,12);
//bVBR = LoadVBRHeader(bytVBitRate);
vbrFrameInfo = new VBRHeader(fs, (long)intPos);
// Find the last Audio Frame of the MP3
findLastFrame(fs);
// Once the file's read in, then assign the properties of the file to the public variables
intBitRate = getBitrate();
intFrequency = firstFrame.getFrequency();
strMode = firstFrame.getChannelMode();
intLength = getLengthInSeconds();
strLengthFormatted = getFormattedLength();
fs.Close();
}
}
