• Journal of KIISE:Computing Practices and Letters
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• v.9 no.3
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• pp.254-265
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• 2003

This paper presents the design and implementation of stream control mechanisms which are necessary for the development of an efficient streaming cache server. The streaming protocols used in our implementation are the RTSP/RTP/RTCP standards. The mechanisms support both the on-demand media caching and real-time media splitting applications. The core of the stream control includes the session management, which handles the RTSP/RTCP control session and the RTP transport session, and the cache block management which efficiently manages the RTP-based cache blocks stored in the cache server. The streaming cache server with the proposed stream control mechanism has successfully been implemented on a Linux platform and it works well with the Apple's QTSS server and the QuickTime player for both on-demand and splitting media services.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.2229-2232
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• 2003

인터넷이 활성화되면서 다양한 서비스가 제공되어지고 있다. 그 가운데 하나가 MOD(Multimedia on Demand) 서비스이다. MOD는 다양한 프로그램을 사용자가 원하는 시점에 볼 수 있도록 한다. MOD 서비스를 유료화 할 경우 시청한 양만큼 요금을 지불하는 pay-per-view 방법을 생각할 수 있다. 본 논문에서는 RTP(Realtime Tansport Protocol)/RTSP(Real Time Streaming Protocol)를 이용한 스트리밍 서버와 클라이언트를 구현하고 여기에 PPV(Pay-Per-View)를 적용해 본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.213-216
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• 2005

In this paper, we propose the redirect streaming service model to enhance resurgent ability. The system consists of a redirect server, local streaming servers and clients. A redirect server searches the best streaming server. And streaming servers starts a requested service or resumes it when in a trouble. RTSP/RTP is one of the effective solutions to improve QOS in VOD, however a service can be broken off by an overloaded server or network especially in live. We designed and implemented not only a distributed streaming system that solves the broken-off service to enhance a resurgent system, but also DSSP, distributed streaming service protocol, which is adopted to implement this model. Those will improve the performance of streaming service using RTP/RTSP and be contributed to a real time streaming research to solve a service trouble.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.250-255
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• 2007

본 논문은 UPnP 기반의 홈 네트워크 환경에서 실시간 미디어 전송을 위한 UPnP AV 프레임워크를 설계하고, 디지털 엔터테인먼트 센터를 구현하였다. 가정에서의 오디오, 비디오 컨텐츠의 사용은 날로 증가하고 있으며, 사용자들은 이들 컨텐츠의 실시간 전송 서비스를 요구하고 있다. 기존의 UPnP AV 프레임워크에서의 컨텐츠를HTTP-GET 스트리밍 방식으로 전송 하였으므로 실시간 서비스를 하기에는 한계가 있었다. 본 연구에서는 RTP/RTSP 스트리밍 방식으로 컨텐츠 전송 서비스가 가능한 확장된 UPnP AV 프레임워크를 구현 하였다. 그 결과 사용자는 실시간 미디어 전송 서비스 이용이 가능하게 되었다.

• Journal of KIISE:Computing Practices and Letters
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• v.10 no.6
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• pp.460-471
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• 2004

Since the RTP is suitable for real-time data transmission in multimedia services like VoD, AoD, and VoIP, it has been adopted as a real-time transport protocol by RTSP, H.323, and SIP. Even though the RTP protocol stack for embedded systems has been in great need for efficient support of multimedia services, such a stack has not been developed yet. In this paper, we explain embeddedRTP which supports the RTP protocol stack at the kernel level so that it is suitable for embedded systems. Since embeddedRTP is designed to reside in the UBP module, existing applications which rely ell TCP/IP services can proceed the same as before, while applications which rely on the RTP protocol stack can request HTP services through embeddedRTp API. EmbeddedRTP stores transmitted RTP packets into per session packet buffer, using the packet's port number and multimedia session information. Communications between applications and embeddedRTP is performed through system calls and signal mechanisms. Additionally, embeddedRTP API makes it possible to develop applications more conveniently. Our performance test shows that packet-processing speed of embeddedRTP is about 7.5 times faster than that oi VCL RTP for multimedia streaming services on PDA in spite that its object code size is reduced about by 58% with respect to UCL RTP's.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.255-258
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• 2001

본 논문에서는 MPEG-2 AAC(Advanced Audio Coding)와 RTP/RTCP, RTSP, TCP/IP 등의 인터넷 프로토콜을 이용한 고품질 인터넷 오디오 방송 기술에 대해 기술한다. AAC 데이터를 인터넷을 통해 실시간으로 전송하기 위해 RTP/RTCP 프로토콜을 사용하고, 사용자에게 편리한 인터페이스를 제공하기 위해 RTSP 프로토콜을 사용한다. TCP/IP 프로토콜은 서버/클라이언트간에 중요한 정보의 교환에 이용되어 진다. 본 논문에서는 위의 다양한 프로토콜을 이용하여 AAC 데이터를 스트리밍 하는 방법과 이를 이용한 인터넷 오디오 방송용 서버/클라이언트를 구성하는 방법에 대해 기술한다.

• The Journal of the Acoustical Society of Korea
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• v.21 no.2
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• pp.93-101
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• 2002

This paper presents the Internet audio broadcasting technology based on the streaming technology. In this paper, we choose the MPEG-2 AAC for multimedia data, and for the streaming of this data we use RTP/RTCP protocol. We use RTSP protocol for the control of streaming data and TCP/IP for the exchange of information between server and client. By using all of these protocols and MPEBG-2 AAC, we explain the implementation method for the unicast/multicast streaming server/client system. Our system was tested by ETRI intranet, which is connected by 2000 researchers. Experimental result show that our system can be process the packet loss and jitter by retransmission and variable length buffer. Multicast streaming server can be used for the audio broadcasting service inside the company, unicast streaming server can be used for the AOD (Audio On Demand) service.

• Journal of KIISE:Computing Practices and Letters
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• v.7 no.1
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• pp.24-37
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• 2001

This paper deals with our experience for the design and implementation of Transport and Session managers in the Integrated Streaming Service Architecture (IS SA) that was developed by the authors. The ISSA is a streaming framework that allows to develop integrated multimedia streaming applications such as VOD system in unicast/multicast and real-time broadcastOive-cast). It also facilities standard real-time transport protocols such as RTp(Real-Time Transport Protocol)/RTCP(Real-time Control Protocol) and RTSP(Real-Time Streaming ProtocoD that allows to user openness. The ISSA supports diverse media fonnats and is independent from underlying networks and operating systems, and compatible with the global real-time multimedia database system (BeeHive) so that streaming media are efficiently retrieved, stored, and serviced. The role of the Transport Manager is to do packetization and depacketization for the different types of multimedia data and delivers the packetized media data in real-time. The Transport Manager uses RTP protocol. The role of the Session Manager is to establish and control the media channel by using RTSP protocol and to deliver the database transactions for the multimedia database by using RTTP(Real-Time Transaction Protocol) protocol. Both the Transport and Session Manager are doing their functions through the network interface in the ISSA that allows developers to various network programming interfaces and provides flexibility to the system.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.760-762
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• 2001

리눅스 클러스터 서버는 고성능 저가의 PC와 공개 소프트웨어인 리눅스를 활용함으로써 고가의 단일서버에 비하여 확장성과 가용성이 높은 고성능 서버의 실현이 가능하다. 이에 따라 리눅스 클러스터 서버를 대용량 멀티미디어 스트리밍 서비스 등에 활용하고자 하는 연구가 활발히 이루어지고 있다. 본 논문에서는 리눅스 클러스터 상에서 스트리밍 표준 프로토콜인 RTSP/RTP를 기반으로 현재 가장 널리 활용되고 있는 Microsoft사의 ASF 파일 형식을 지원하는 스트리밍 서버와 클라이언트 플레이어를 설계 구현한다. 구현된 시스템은 Windows 시스템에 비하여 비교적 저가에 현재 인터넷상에서 스트리밍 서비스의 표준으로 자리잡고 있는 ASF 파일의 스트리밍 실현이 가능하다.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.65 no.4
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• pp.326-334
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• 2016

In this paper for developing and implementing the realtime HD level video streaming transmitter which is operated on the multi-platform in all network and client environment compared to the exist video live streaming transmitter. We design the realtime HD level video streaming transmitter supporting the multi-platform using the TMS320DM386 video processor of T.I company and then porting the Linux kernel 2.6.29 and implementing the RTSP(Real Time Streaming Protocol)/RTP(Real Time Transport Protocol), HLS(Http Live Streaming), RTMP(Real Time Messaging Protocol) that can support the multi-platform of video stream protocol of the received equipments (smart phone, tablet PC, notebook etc.). For proving the performance of developed video streaming transmitter, we make the testing environment for testing the performance of streaming transmitter using the notebook, iPad, android Phone, and then analysis the received video in the client displayer. In this paper, we suggest the developed the Realtime HD(High Definition) level Video Streaming transmitter performance data values higher than the exist products.