A new file system with time-based indexing scheme for continuous media streams

Many embedded systems generate and store multimedia data streams continuously before eventually processing the stored stream at a later time. When the stream is stored in variable bandwidth, additional CPU processing is inevitably involved in locating the exact frame positions corresponding to specific times. In this paper, a new file system with time-based indexing scheme is proposed. This time-based indexing scheme periodically stores the relations between the time and data locations. With this index information, applications can pinpoint the exact frame location corresponding to a given time. To prove the usefulness and effectiveness, we implemented the proposed file system and the indexing scheme on a Linux-based DVR and then compared the performance with that of the ext2 file system.