/// <summary>
/// Set the frame text
/// </summary>
/// <param name="frameId">Frame type</param>
/// <param name="message">Value set in frame</param>
private void SetTextFrame(string frameId, string message)
{
var frame = FindFrame(frameId);
if (frame != null)
{
if (!String.IsNullOrEmpty(message))
{
((FrameText)frame).Text = message;
}
else
{
_frameModel.Remove(frame);
}
}
else
{
if (!String.IsNullOrEmpty(message))
{
FrameText frameText = (FrameText)FrameFactory.Build(frameId);
frameText.Text = message;
frameText.TextCode = _textCode;
_frameModel.Add(frameText);
}
}
}
private TagModel GetFrameModel()
{
var frameModel = new TagModel();
var frameText = new FrameText("TIT2");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _song;
frameModel.Add(frameText);
frameText = new FrameText("TPE1");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _artist;
frameModel.Add(frameText);
frameText = new FrameText("TALB");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _album;
frameModel.Add(frameText);
frameText = new FrameText("TYER");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _year;
frameModel.Add(frameText);
frameText = new FrameText("TRCK");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _track.ToString(CultureInfo.InvariantCulture);
frameModel.Add(frameText);
var frameFullText = new FrameFullText("COMM");
frameFullText.TextCode = TextCode.Ascii;
frameFullText.Language = "eng";
frameFullText.Description = "";
frameFullText.Text = _comment;
frameModel.Add(frameFullText);
if (_genre >= 0 && _genre < _genres.Length)
{
// from suggestion in http://sourceforge.net/tracker2/?func=detail&aid=920249&group_id=89188&atid=589317
frameText = new FrameText("TCON");
frameText.TextCode = TextCode.Ascii;
frameText.Text = _genres[_genre];
frameModel.Add(frameText);
}
//TODO: Fix this code!!!!!!!!
frameModel.Header.TagSize = 0; //TODO: Invalid size, not filled in until write
frameModel.Header.Version = 3; // ID3v2.[3].[0]
frameModel.Header.Revision = 0;
frameModel.Header.Unsync = false;
frameModel.Header.Experimental = false;
frameModel.Header.Footer = false;
frameModel.Header.ExtendedHeader = false;
return(frameModel);
}
public static TagModel Deserialize([NotNull] Stream stream)
{
var frameModel = new TagModel();
frameModel.Header.Deserialize(stream); // load the ID3v2 header
if (frameModel.Header.Version != 3 & frameModel.Header.Version != 4)
{
throw new NotImplementedException("ID3v2 Version " + frameModel.Header.Version + " is not supported.");
}
var id3TagSize = frameModel.Header.TagSize;
MemoryStream memory = null;
try
{
if (frameModel.Header.Unsync)
{
memory = new MemoryStream();
id3TagSize -= Sync.Unsafe(stream, memory, id3TagSize);
stream = memory; // This is now the stream
if (id3TagSize <= 0)
{
throw new InvalidTagException("Data is missing after the header.");
}
}
uint rawSize;
// load the extended header
if (frameModel.Header.ExtendedHeader)
{
frameModel.ExtendedHeader.Deserialize(stream);
rawSize = id3TagSize - frameModel.ExtendedHeader.Size;
if (id3TagSize <= 0)
{
throw new InvalidTagException("Data is missing after the extended header.");
}
}
else
{
rawSize = id3TagSize;
}
// Read the frames
if (rawSize <= 0)
{
throw new InvalidTagException("No frames are present in the Tag, there must be at least one present.");
}
// Load the tag frames
uint index = 0;
var frameHelper = new FrameHelper(frameModel.Header);
// repeat while there is at least one complete frame available, 10 is the minimum size of a valid frame
// but what happens when there's only, say, 5 bytes of padding?
// we need to read a single byte to inspect for padding, then if not, read a whole tag.
while (index < rawSize)
{
var frameId = new byte[4];
stream.Read(frameId, 0, 1);
if (frameId[0] == 0)
{
// We reached the padding area between the frames and the end of the tag,
// signified by a zero byte where the frame name should be.
// we could double check we actually know what's going on
// and check the padding goes exactly to the end of the id3 tag
// but in fact it doesn't give us any benefit.
//
// one of the following cases must apply:
//
// 1) if the id3 tag specifies more bytes than the frames use up,
// and that space is exactly filled with zeros to the first audio frame,
// it complies with the standard and everything is happy.
//
// 2) if the id3 tag specifies more bytes than the frames use up,
// and that space isn't completely filled with zeros,
// we assume the software that generated the tag
// forgot to zero-fill it properly.
//
// 3) if the zero padding extends past the start of the id3 tag,
// we assume the audio payload starts with skippable stuff too.
//
// 4) if the audio payload doesn't start with a valid mpeg audio frame header,
// (VBR headers have valid mpeg audio frame headers)
// we assume there's a tag in a format we don't recognise.
// It still has to comply with the mpeg sync rules,
// so we will have to use that to find the start of the audio.
//
// in all cases, we read the specified length of the id3 tag
// and let the higher-level processing inspect the audio payload
// to decide what is audio, what is extra padding,
// and what is unrecognised (non-id3) tags.
// how much does the tag size say should be left?
frameModel.Header.PaddingSize = rawSize - index;
//// advance the stream past any zero bytes,
//// and verify the real measured size against that specified in the tag
//uint observed = SeekEndOfPadding(src) + 1;
//if( frameModel.Header.PaddingSize != observed )
// throw new InvalidPaddingException(observed, frameModel.Header.PaddingSize);
// advance the stream to the specified end of the tag
// this skips any non-zero rubbish in the padding without looking at it.
stream.Seek(frameModel.Header.PaddingSize - 1, SeekOrigin.Current);
break;
}
if (index + 10 > rawSize)
{
// 10 is the minimum size of a valid frame;
// we read one already, if less than 9 chars left it's an error.
throw new InvalidTagException("Tag is corrupt, must be formed of complete frames.");
}
// read another 3 chars
stream.Read(frameId, 1, 3);
index += 4; // have read 4 bytes
//TODO: Validate key valid ranges
using (var reader = new BinaryReader(stream, Encoding.UTF8, true))
{
var frameSize = Swap.UInt32(reader.ReadUInt32());
index += 4; // have read 4 bytes
// ID3v2.4 now has sync-safe sizes
if (frameModel.Header.Version == 4)
{
frameSize = Sync.Unsafe(frameSize);
}
// The size of the frame can't be larger than the available space
if (frameSize > rawSize - index)
{
throw new InvalidFrameException(
"A frame is corrupt, it can't be larger than the available space remaining.");
}
var flags = Swap.UInt16(reader.ReadUInt16());
index += 2; // read 2 bytes
var frameData = new byte[frameSize];
reader.Read(frameData, 0, (int)frameSize);
index += frameSize; // read more bytes
frameModel.Add(frameHelper.Build(Encoding.UTF8.GetString(frameId, 0, 4), flags, frameData));
}
}
return(frameModel);
}
finally
{
memory?.Close();
}
}