static public MMChunk FromStream(Stream st)
{
if (!st.CanRead)
{
return(null);
}
if (st.Position > st.Length - 4)
{
return(null);
}
byte[] data = new byte[4];
st.Read(data, 0, 4);
FourCC fourCC = BitConverter.ToInt32(data, 0);
if (fourCC == FourCC.Riff)
{
RiffChunk ck = new RiffChunk(st);
ck.LoadFromStream(st);
return(ck);
}
else if (fourCC == FourCC.Fmt)
{
FmtChunk ck = new FmtChunk(st, null);
ck.LoadFromStream(st);
return(ck);
}
else if (fourCC == FourCC.Data)
{
DataChunk ck = new DataChunk(st);
ck.LoadFromStream(st);
return(ck);
}
else
{
_RiffChunk ck = new _RiffChunk(fourCC, st);
ck.LoadFromStream(st);
return(ck);
}
}
virtual public MMChunk CreateSubChunk(FourCC fourCC, Stream st)
{
if (fourCC == FourCC.Riff)
{
MMChunk ck = new RiffChunk(st);
m_chunkList.Add(ck);
return(ck);
}
else if (fourCC == FourCC.Fmt)
{
MMChunk ck = new FmtChunk(st, null);
m_chunkList.Add(ck);
return(ck);
}
else if (fourCC == FourCC.Data)
{
MMChunk ck = new DataChunk(st);
m_chunkList.Add(ck);
return(ck);
}
return(null);
}