public static Box FromStream(Stream stream, BaseMediaOptions options = BaseMediaOptions.LoadChildren)
{
Box box = null;
try
{
ulong offset = (ulong)stream.Position;
uint size = stream.ReadBEUInt32();
uint type = stream.ReadBEUInt32();
ulong?largeSize = null;
if (size == 1)
{
largeSize = stream.ReadBEUInt64();
}
BoxType boxType = (type == uuidType)
? new BoxType(new Guid(stream.ReadBytes(16)))
: new BoxType(type);
AvailableBoxTypes.TryGetValue(boxType, out Type t);
box = t != null ? (Box)Activator.CreateInstance(t) : new Boxes.UnknownBox(boxType);
box.Size = size;
box.LargeSize = largeSize;
box.Offset = offset;
box.Initialize(ConstrainedStream.WrapStream(stream), options);
}
catch (EndOfStreamException) { }
return(box);
}
protected Box()
{
BoxAttribute[] boxAttributes = (BoxAttribute[])this.GetType().GetCustomAttributes(typeof(BoxAttribute), true);
if (boxAttributes != null && boxAttributes.Length != 0)
{
Type = boxAttributes[0].Type;
}
else if (!(this is Boxes.UnknownBox))
{
throw new Exception("BMFF Box derivative is not decorated with a BoxAttribute.");
}
}
/// <summary>
/// Deserializes a specific box type from the stream.
/// </summary>
/// <exception cref="System.FormatException">Thrown when the next box in the stream is not the expected type.</exception>
/// <param name="stream">Stream containing the box to be deserialized at the current position.</param>
protected Box(Stream stream)
{
Offset = (ulong)stream.Position;
Size = stream.ReadBEUInt32();
uint type = stream.ReadBEUInt32();
if (Size == 1)
{
LargeSize = stream.ReadBEUInt64();
}
if (type == 0x75756964) // 'uuid'
{
Type = new BoxType(new Guid(stream.ReadBytes(16)));
}
else
{
Type = new BoxType(type);
}
bool foundMatchingAttribute = false;
object[] boxAttributes = this.GetType().GetCustomAttributes(typeof(BoxAttribute), true);
foreach (BoxAttribute boxAttribute in boxAttributes)
{
if (boxAttribute.Type == Type)
{
foundMatchingAttribute = true;
}
}
if (!foundMatchingAttribute)
{
throw new FormatException("Unexpected BMFF Box Type.");
}
Initialize(stream);
}
public BoxAttribute(Guid uuid, string description = null)
{
Type = new BoxType(uuid);
Description = description;
}
public BoxAttribute(int type, string description = null)
{
Type = new BoxType((uint)type);
Description = description;
}
public BoxAttribute(string type, string description = null)
{
Type = new BoxType(type);
Description = description;
}
public BoxAttribute(Guid uuid, string description = null)
{
Type = new BoxType(uuid);
Description = description;
}
public BoxAttribute(int type, string description = null)
{
Type = new BoxType((uint)type);
Description = description;
}
public BoxAttribute(string type, string description = null)
{
Type = new BoxType(type);
Description = description;
}