/// <summary>
/// Creates a new SeekTable base on the provided binary data.
/// </summary>
/// <param name="data"></param>
public override void LoadBlockData(byte[] data)
{
UInt32 numberOfSeekpoints;
SeekPoint newSeekPoint;
numberOfSeekpoints = this.Header.MetaDataBlockLength / SEEKPOINT_SIZE;
for (int i = 0; i < numberOfSeekpoints; i++)
{
newSeekPoint = new SeekPoint(BinaryDataHelper.GetDataSubset(data, i * (int)SEEKPOINT_SIZE, (int)SEEKPOINT_SIZE));
// We should keep in mind that the placeholder seekpoints aren't actually added to the list but are kept only as a
// count in this.SeekPoints.Placeholders
this.SeekPoints.Add(newSeekPoint);
}
}
/// <summary>
/// Loads the picture data from a Metadata block.
/// </summary>
/// <param name="data"></param>
public override void LoadBlockData(byte[] data)
{
// First 32-bit: picture type according to the ID3v2 APIC frame
pictureType = (PictureType)(int)BinaryDataHelper.GetUInt32(data, 0);
// Then the length of the MIME type text (32-bit) and the mime type
int mimeTypeLength = (int)BinaryDataHelper.GetUInt32(data, 4);
byte[] mimeData = BinaryDataHelper.GetDataSubset(data, 8, mimeTypeLength);
this.mimeType = Encoding.ASCII.GetString(mimeData);
int byteOffset = 8 + mimeTypeLength;
// Then the description (in UTF-8)
int descriptionLength = (int)BinaryDataHelper.GetUInt32(data, byteOffset);
byte[] descriptionData = BinaryDataHelper.GetDataSubset(data, byteOffset + 4, descriptionLength);
this.description = Encoding.UTF8.GetString(descriptionData);
byteOffset += 4 + descriptionLength;
this.width = BinaryDataHelper.GetUInt32(data, byteOffset);
this.height = BinaryDataHelper.GetUInt32(data, byteOffset + 4);
this.colorDepth = BinaryDataHelper.GetUInt32(data, byteOffset + 8);
this.colors = BinaryDataHelper.GetUInt32(data, byteOffset + 12);
byteOffset += 16;
int dataLength = (int)BinaryDataHelper.GetUInt32(data, byteOffset);
this.data = BinaryDataHelper.GetDataSubset(data, byteOffset + 4, dataLength);
// According to the FLAC format, if the mimeType is the string -->, the data contains
// a URL, pointing to the image. A URL should be ASCII encoded, but using UTF-8 seems
// more sensible.
if (mimeType == "-->")
{
this.url = Encoding.UTF8.GetString(this.data);
}
}
/// <summary>
/// Loads the Vorbis from a block of data.
/// </summary>
/// <param name="data"></param>
public override void LoadBlockData(byte[] data)
{
UInt32 vendorLength = BinaryDataHelper.GetUInt32(BinaryDataHelper.SwitchEndianness(data, 0, 4), 0);
this.vendor = Encoding.UTF8.GetString(BinaryDataHelper.GetDataSubset(data, 4, (int)vendorLength));
int startOfComments = 4 + (int)vendorLength;
UInt32 userCommentListLength = BinaryDataHelper.GetUInt32(BinaryDataHelper.SwitchEndianness(data, startOfComments, 4), 0);
// Start of comments actually four bytes further (first piece is the count of items in the list)
startOfComments += 4;
for (UInt32 i = 0; i < userCommentListLength; i++)
{
UInt32 commentLength = BinaryDataHelper.GetUInt32(BinaryDataHelper.SwitchEndianness(data, startOfComments, 4), 0);
string comment = Encoding.UTF8.GetString(BinaryDataHelper.GetDataSubset(data, startOfComments + 4, (int)commentLength));
// We're moving on in the array ...
startOfComments += 4 + (int)commentLength;
AddComment(comment);
}
// All done, note that FLAC doesn't have the "fraiming bit" for vorbis ...
}
