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Pure virtual method.
Implemented in file_id::file, file_id::checksum, file_id::label, file_id::name, file_id::route, file_id::route_full, file_id::route_nounit, file_id::route_relative, file_id::size, file_id::size_bytes, file_id::size_kb, file_id::size_mb, file_id::num_files, file_id::sum_size, file_id::sum_size_bytes, file_id::sum_size_kb, file_id::sum_size_mb, custom_id, id3_id::id3v1, id3_id::id3v2, id3_id::song, id3_id::artist, id3_id::album, id3_id::year, id3_id::track, id3_id::genre, id3_id::comment, mp3_id::mp3, mp3_id::mpeg, mp3_id::layer, mp3_id::crc, mp3_id::bitrate, mp3_id::bitrate_bps, mp3_id::bitrate_kbps, mp3_id::samplerate, mp3_id::samplerate_hz, mp3_id::samplerate_khz, mp3_id::chanmode, mp3_id::copyright, mp3_id::original, mp3_id::emphasis, mp3_id::duration, mp3_id::duration_sec, mp3_id::duration_hms, mp3_id::frames, mp3_id::offset, mp3_id::num_mp3, mp3_id::sum_size, mp3_id::sum_size_bytes, mp3_id::sum_size_kb, mp3_id::sum_size_mb, mp3_id::sum_duration, mp3_id::sum_duration_sec, and mp3_id::sum_duration_hms. |