def METHOD_NAME(self):
    # Searching GUID
    while True:
        buf = self.f.read(16)
        if len(buf) < 16 or self.f.tell() > 50000:
            raise FormatError
        guid = buf.encode("hex");
        if guid == "3626b2758e66cf11a6d900aa0062ce6c":
            # ASF_Data_Object
            self.f.seek(-16,1)     # rollback
            self.audioStart = self.f.tell()
            return
        else:
            objlen = struct.unpack('<Q', self.f.read(8))[0]
            self.f.seek(objlen-24,1)     # jump to next object