HYDRA- High Performance Data Recording Architecture for Streaming Media

目前，大量的数字流媒体，如音频和视频，已经成为许多应用程序中无处不在和不可或缺的一部分。本研究项目的目标是研究、设计和实现一个数据流记录器，以解决在实时和大规模地获取、存储、操纵和传播数字连续媒体（CM）流的广泛创新应用中固有的挑战。为此，研究的重点是一个统一的范例，以协同的方式集成多流记录、检索和控制，为所有媒体提供定义良好的服务，认识到它们的特征，如带宽要求、分辨率和模式。研究主题包括新的共享缓冲区管理技术，基于综合随机变量模型的统计准入控制算法，以支持多个可变比特率媒体流的读写和多阈值流控制协议，从而实现流畅的流采集和回放。此外，还通过一种声明性语言研究了全面的查询支持，该语言有助于规范媒体流中的时间和语义关系。由此产生的功能具有巨大的吸引力，并有望对利用多媒体传感器的广泛应用产生重大的实际影响，从工业监控（如智能交通管理）到国土安全和娱乐应用。该项目的一个组成部分是在信息理解和沉浸式环境领域评估流记录器设计。这个项目的原型实施和实验研究将作为多媒体和服务器技术课程的教学工具，并将通过项目网站http://dmrl.usc.edu/hydra.html传播。

IIS-0534761Roger Zimmermann rzimmerm@imsc.usc.eduUniversity of Southern CaliforniaHYDRA - High Performance Data Recording Architecture for Streaming MediaPresently, an abundance of digital streaming media such as audio and video have become a pervasive and integral part of many applications. The goals of this research project are to study, design and implement a data stream recorder that addresses the challenges inherent in a broad class of innovative applications that acquire, store, manipulate and disseminate digital continuous media (CM) streams in real-time and on a large scale. To this end the research focuses on a unified paradigm that integrates multi-stream recording, retrieval and control in a synergistic manner to provide well-defined services for all media, cognizant of their characteristics such as bandwidth requirements, resolution and modality. The topics of study include novel shared buffer management techniques, statistical admission control algorithms based on a comprehensive random variable model to support both reading and writing of multiple variable bitrate media streams and multi-threshold flow control protocols enabling smooth stream acquisition and playback. Additionally, comprehensive query support is investigated through a declarative language that facilitates the specification of both temporal and semantic relationships in media streams.The resulting capabilities have tremendous appeal and are expected to have a significant practical impact on a broad range of applications that make use of multimedia sensors, from industrial monitoring - such as intelligent traffic management - to homeland security and entertainment applications. An integral part of the project is the evaluation of the stream recorder design in the domains of information comprehension and immersive environments. The prototype implementation and experimental research of this project will be used as a teaching tool for courses covering multimedia and server technology and will be disseminated via the project Web site at http://dmrl.usc.edu/hydra.html.