private void CreateV1Frame(Stream stream)
{
// ID1 header am ende ...
stream.Seek(-125, SeekOrigin.End);
// 30 zeichen title => TIT2
// 30 zeichen artist => TCOM
// 30 zeichen album => TALB
// 4 zeichen jahr => TYER
// 30 zeichen commentar - kann auch den track enthalten (TRCK) - der letzte byte
// 1 byte Genre
// == 125
foreach (var item in new[] { "TIT2", "TCOM", "TALB" })
{
AddNonEmptyFrame(item, stream.Read(30));
}
AddNonEmptyFrame("TYER", stream.Read(4));
// comment - egal
stream.Seek(28, SeekOrigin.Current);
var track = stream.Read(2);
if (track[0] == 0 && track[1] != 0)
{
// dann ist track[1] eine zahl;
if (track[1] < 48)
{
Frame f = new Frame("TRCK");
f.FrameData = ((int)track[1]).ToString();
Frames.Add(f);
}
}
}
private Stream FrameObjectToByteArray(Frame F)
{
var byteValues = ByteHelper.StringToByte(F.FrameData);
int DataSize = byteValues.Length + 1;
MemoryStream temp = new MemoryStream();
// Frame ID $xx xx xx xx (four characters)
temp.Write(ByteHelper.StringToByte(F.FrameID));
// Size $xx xx xx xx
var blub = ByteHelper.GetBytesFromInt32(DataSize);
temp.Write(blub);
// Flags $xx xx
// keine flags
temp.Write(new byte[] {0, 0} , 0 , 2);
// und das wichtigste die DATEN
// als erstes das (die) extra encoder byte(s)
temp.Write(new byte[] { 0 });
// dann die daten
temp.Write(byteValues);
temp.Seek(0, SeekOrigin.Begin);
return temp;
}
private void AddNonEmptyFrame(string FrameID, byte[] Value)
{
var framedata = ByteHelper.BytesToString(Value);
if (String.IsNullOrEmpty(framedata))
return;
Frame f = new Frame(FrameID);
f.FrameData = framedata;
Frames.Add(f);
}
private Frame CreateV3Frame(Stream stream)
{
// Frame ID $xx xx xx xx (four characters)
var frameIDBytes = stream.Read(4);
if (frameIDBytes[0] == 0)
return null;
string FrameID = ByteHelper.BytesToString(frameIDBytes);
Frame F = new Frame(FrameID);
// Size $xx xx xx xx
int DataSize = ByteHelper.GetInt32FromBytes(stream.Read(4));
// Flags $xx xx
F.SetFlags(stream.Read(2));
if (FrameID[0] == 'T')
F.FrameData = readTextFrame(stream, DataSize);
else if (FrameID == "APIC")
{
//<Header for 'Attached picture', ID: "APIC">
//Text encoding $xx
//MIME type <text string> $00
//Picture type $xx
//Description <text string according to encoding> $00 (00)
//Picture data <binary data>
F.FrameData = "Images - currently not supported";
stream.Seek(DataSize, SeekOrigin.Current);
}
else
F.FrameData = ByteHelper.BytesToString(stream.Read(DataSize));
return F;
}