Patent ID: 7366204

Claim:
An apparatus for restoring an RTP (Real-Time Transport Protocol) packet comprising: a setting unit assigning a CTS (Composition TimeStamp), a DTS (Decoding TimeStamp), and a PSN (Packet Sequence Number) that sequentially increase according to a packet generation order for each of a plurality of SL (Synchronization Layer) packets, and extracting a time stamp length and a packet sequence number length from an SLCD (SL Configuration Descriptor) within each SL packet; and a packet generating unit generating a header of each SL packet accommodated in an RTP packet header and the RTP packet based on the CTS, the DTS, the PSN, the time stamp length and the packet sequence number length, wherein the packet generating unit comprises: an RTP packet header generating unit generating an RTP packet header including an RTP time stamp calculated based on the CTS, and RTP time stamp=(CTS of first SL packet) % (RTP time stamp length), wherein % represents modulo; a CTS delta generating unit generating a CTS delta based on the CTS and the RTP time stamp; a DTS delta generating unit generating a DTS delta based on the CTS and the DTS; and an index/index delta generating unit receiving the PSN, an index length, and an index delta length and generating an index/index delta.