Here is a list of all documented variables with links to the documentation:

olaf_db_mem_audio_duration : olaf_fp_ref_mem.h
olaf_db_mem_audio_id : olaf_fp_ref_mem.h
olaf_db_mem_audio_path : olaf_fp_ref_mem.h
olaf_db_mem_fp_length : olaf_fp_ref_mem.h
olaf_db_mem_fps : olaf_fp_ref_mem.h