public static OverlayInfo Read(BinaryReader reader)
{
var header = reader.ReadInt32();
if (header != nameof(OverlayInfo).GetHashCode())
{
return(null);
}
var message = reader.ReadString();
var keyFrame = reader.ReadBoolean();
var info = format.ReadFrame(reader);
info.Message = message;
info.KeyFrame = keyFrame;
return(info);
}
public static OverlayInfo FromFrame(VideoFrame frame)
{
unsafe
{
using (var stream = new UnmanagedMemoryStream((byte *)frame.GetReadPtr().ToPointer(),
frame.GetRowSize(), frame.GetRowSize(), FileAccess.Read))
using (var reader = new BinaryReader(stream))
{
var header = reader.ReadString();
if (header != nameof(OverlayInfo))
{
throw new AvisynthException();
}
return(format.ReadFrame(reader));
}
}
}
public OverlayInfo this[int frameNumber]
{
get
{
lock (stream)
{
if (stream.Length == 0)
{
return(null);
}
CheckHeader();
stream.Position = 1 + format.FrameSize * frameNumber;
if (stream.Position >= stream.Length)
{
return(null);
}
return(format.ReadFrame(reader));
}
}
set
{
lock (stream)
{
WriteHeader();
stream.Position = 1 + format.FrameSize * frameNumber;
var writer = new BinaryWriter(stream);
if (value == null)
{
writer.Write(0);
}
else
{
value.FrameNumber = frameNumber;
format.WriteFrame(writer, value);
}
writer.Flush();
}
}
}