Linux 摄像头驱动的设计优化及其对应的 Android 下HAL 封装设计方法探究

摘要

For current status of camera driver in Android system not being the open-source,by learning form the related driver in Linux, we proposed an integrated design scheme to improve the design of driver and optimise it as well,especially in FIMC driver,we composed the FIMC and ov9650 into a single device,this significantly improved the operation efficiency of camera driver.After that,by analysing Android framework,we designed a HAL module,which completes the functions of camera with three threads in parallel,we also used it to encapsulate Linux camera driver.The content of the paper includes the design and optimisation of Linux camera driver,the design of Android HAL module,and the specific procedure of encapsulating the Linux camera driver with HAL. In end of the paper we submit the experimental result.%针对 Android 系统下摄像头驱动程序不开源的现状，将借鉴 Linux 下的相关驱动程序，提出一体化设计方案，对驱动加以改进设计和优化，特别是在 FIMC 驱动中，将 FIMC 和 ov9650合成为了一个设备，显著提高了驱动的运行效率。然后，通过对 Android框架的分析，设计一种 HAL 模块，采用三个线程并行完成摄像头功能，并用此模块对驱动进行封装。内容包括 Linux 摄像头驱动的开发与优化，Android HAL 模块的设计，以及将 Linux 摄像头驱动程序进行 HAL 封装的具体步骤。最后，给出实验结果。