The adaptive layer-based scheduling system for embedded real-time transmission on scalable multimedia stream
Chia-Ying Tseng · International Journal of Embedded Systems · 2006
With the recent development in compression and network technology, stream media has been adopted in internet and intranet. Application of stream media technology will play a key role in future development of fast networks. Original video/audio data will be stored in the devices for storage after having been pre-compressed by a video/audio compression algorithm. When clients have requirements, the stream server retrieves the video/audio data from the storage devices through the network. This paper discusses a simple and effective real-time scheduling algorithm, adaptive Layer-Based Least-Laxity-First (LB-LLF) scheduling algorithm, to improve the output quality of video/audio on a network and to achieve synchronised playback effect. The proposed algorithm considered real-time constraint, unequal priorities of scalable media stream in different layers, and a good tradeoff between coding efficiency and drifting error. This guarantees the effective usage of available channel bandwidth and the better quality of playback in client.