FormatString
IN CONST CHAR16 *FormatString,
IN CONST CHAR8 *FormatString,
IN CONST CHAR8 *FormatString,
IN CONST CHAR8 *FormatString,
IN CONST CHAR8 *FormatString,
IN CONST CHAR16 *FormatString,
IN CONST CHAR16 *FormatString,
IN CONST CHAR16 *FormatString,
msg1 = ohdr.FormatString();
msg1 = ihdr.FormatString();
msg2 = ohdr.FormatString();
virtual char *FormatString() const; // eg "4-bit G.721, 8 kHz, mono"