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.Wave )
{
MMChunk ck = new WaveChunk(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;
}
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.Wave )
{
WaveChunk ck = new WaveChunk(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
return new MMChunk(fourCC, st);
}