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引用次数: 0
摘要
网络视频服务器(Network video Server, NVS)作为数字视频监控系统的关键设备之一，以其丰富的功能和高性能，更好地满足用户对视频监控的需求，发挥着重要的作用。随着数字信号处理(DSP)技术的飞速发展，实现高质量的MPEG4/H。在一个DSP芯片上实现264视频图像编解码成为可能。然而，大多数NVS方案都是通过CPU和特定的音频/视频(AN)编解码器或DSP芯片来实现的，这在成本和产品尺寸上有明显的缺点。本文提出了在ADSP-BF561双核芯片dasiaRSIC + DSPpsila模式下工作的单通道嵌入式NVS的设计架构，实现了基于MPEG4的全D1分辨率视频图像编码、网络传输、双向通话、远程控制等功能。讨论了关键模块的实现方法，并对IP网络图像质量、网络时延等性能指标进行了验证。
Design of one-channel embedded Network Video Server
As one of critical devices of digital video surveillance system, Network Video Server (NVS) plays an important role by providing rich functionalities and high performances to better meet userspsila requirements. With rapid development of Digital Signal Processing (DSP) technology, performing high-quality MPEG4/H.264 video image codec in one DSP chip becomes possible. However, a majority of schemes of NVS are implemented via CPU and specific Audio/Video (AN) codec or DSP chip, which has distinct disadvantages in cost and product size. This paper presents design architecture for one-channel embedded NVS, which operates under dasiaRSIC plus DSPpsila mode of ADSP-BF561 chip with dual cores, and realizes video image coding based on MPEG4 with full D1 resolution, network transmitting, bidirectional speaking, and remote control functions, etc. Implementation methods of key modules are discussed, and performance indicators such as image quality over IP network and network delays are also verified in the end.
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