-int sndfile_bitdepth_format_from_string (std::string);
-int sndfile_header_format_from_string (std::string);
-int sndfile_endian_format_from_string (std::string);
-std::string sndfile_file_ending_from_string (std::string);
+int sndfile_bitdepth_format_by_index (int);
+int sndfile_header_format_by_index (int);
+int sndfile_endian_format_by_index (int);