GetTagBytes
m_spIO->Seek(-(m_spAPETag->GetTagBytes() + m_APEFileInfo.nWAVTerminatingBytes), FILE_END);
nRetVal = m_spIO->GetSize() - m_spAPETag->GetTagBytes() - m_APEFileInfo.nWAVTerminatingBytes - GetInfo(APE_INFO_SEEK_BYTE, nFrame);
int nTagBytes = GET_TAG(spAPEDecompress)->GetTagBytes();
virtual int GetTagBytes();