public void Read(Stream stream)
{
using (var binReader = new BinaryReader(stream))
{
//Check that magic number is here.
if (MAGIC != binReader.ReadUInt32()) //4
{
throw new InvalidFileFormatException("Invalid caption file (not VCCD).");
}
if (Version != binReader.ReadUInt32()) //8
{
throw new InvalidFileFormatException("Only VCCD version 2 is supported.");
}
uint blockCount = binReader.ReadUInt32(); //12
BlockSize = binReader.ReadUInt32(); //16
uint numberOfCaptions = binReader.ReadUInt32(); //20 (match to DirectorySize in VRF)
uint dataOffset = binReader.ReadUInt32();
if (dataOffset != (baseHeader + paddingBytes + (numberOfCaptions * headerSize)))
{
//throw new InvalidFileFormatException("Data offset is invalid."); //Apparently this calculation is wrong. So, for now we will ignore it.
}
for (uint i = 0; i < numberOfCaptions; i++)
{
var caption = new ClosedCaption();
caption.SoundEventHash = binReader.ReadUInt32();
caption.DefinitionHash = binReader.ReadUInt32();
caption.Blocknum = binReader.ReadUInt32();
caption.Offset = binReader.ReadUInt16();
caption.ReadLength = binReader.ReadUInt16();
Captions.Add(caption);
}
foreach (var caption in Captions)
{
binReader.BaseStream.Position = dataOffset + (caption.Blocknum * BlockSize) + caption.Offset;
var captionText = binReader.ReadNullTermString(Encoding.Unicode);
//possibility of validating definitionHash against hash of captiontext here.
caption.Definition = captionText;
}
}
}
public ClosedCaptionDependencyObject(ClosedCaption caption)
{
Caption = caption;
CaptionText = caption.Definition;
}
public ClosedCaptionDependencyObject()
{
Caption = new ClosedCaption();
}
public void Add(ClosedCaption caption)
{
Add(caption.SoundEvent, caption.RawDefinition);
}
public void Insert(int index, ClosedCaption caption)
{
Insert(index, caption.SoundEvent, caption.RawDefinition);
}
public CaptionModifierRule()
{
Caption = new ClosedCaption();
}
