본 논문에서 구현한 MPEG-4 미디어 재생기는 네트워크를 통하여 스트리밍 서버에 메시지를 전송하고, 스트리밍 서버로부터 전송된 미디어 스트림을 처리하여 사용자의 화면에 보여주는 역할을 수행한다. 미디어 재생기는 서버에게 VCR(Play, Pause, Stop, Jump)이벤트를 전송하며, 리눅스 운영체제에서 동작한다. 본 논문에서 제안하는 미디어 재생기는 VCR 연산을 위한 RTSP(Real Time Streaming Protocol)를 지원하며 데이터의 실시간 전송을 위하여 RTP(Real-time Transport Protocol)/RTCP(real-time transport control protocol)를 지원한다. RTP/RTCP를 통하여 네트워크 QoS와 관련된 정보를 획득하며 그 정보에 따라서 데이터 전송율을 조절하고 RTCP를 이용하여 에러 패킷에 대한 재전송을 사용한다. 재전송시 미디어 재생기의 버퍼링 상태와 멀티미디어 데이터의 재생시간을 고려하여 멀티미디어 데이터의 끊김이 없도록 한다.
KSP Keywords
Mpeg-4, Real Time Streaming Protocol, Real-Time Transport Protocol, Real-time transport control protocol(RTCP), Transmission Control Protocol(TCP)
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