基于视频流的嵌入式GUI系统设计与实现

摘要

为在DaVinci嵌入系统中显示图形用户界面( GUI)，提出一种基于DaVinci视频流的GUI系统设计方案。通过修改DaVinci Vpif接口Linux核心驱动，使其能够支持用户层和驱动层的多缓冲区共享队列。在Vpif的Linux核心驱动中加入增强型直接内存存取功能，实现缓冲区的自动调度。在用户层通过多层 GUI 系统，设计不依赖于Framebuffer、分层封装的嵌入式GUI界面，使得系统不仅能够支持视频流的处理，而且能在视频流上实现GUI系统与视频处理系统的切换。分析结果表明，该系统能提供用户图形化参数配置的界面，具有资源消耗少、效率高等特点。%This paper designs a Graphic User Interface ( GUI ) system based on DaVinci video stream to achieve displaying GUI in the DaVinci embedded system. It modifies DaVinci-Vpif’ s Linux kernel driver,so that it can support multi-buffer-queue shared between user layer and kernel layer. Add Enhanced Direct Memory Access( EDMA) supports to Vpif’ s Linux kernel driver which enables buffer scheduling automatically. On this basis,this paper brings out a well-designed multi-GUI system that works at the user layer, which gets an embedded GUI interface but need not rely on Framebuffer. The system not only supports the processing of the video stream,but also supports smooth switching between video stream based GUI system and video processing system. Results of this study can be used in a DaVinci-based video processing system to provide a graphical user interface for configuring parameters. The GUI system works well with less resource consumption and high efficiency.