H.265硬编码器的高效数据存取系统设计  

Design of Efficient Data Access System of H.265 Hard Encoder

作　　者：陈业旺 吴林煌[2] 杨俊伟 CHEN Yewang;WU Linhuang;YANG Junwei(School of Advanced Manufacturing,Fuzhou University,Jinjiang 362200,China;College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学先进制造学院,福建晋江362200 [2]福州大学物理与信息工程学院,福建福州350108

出　　处：《电视技术》2022年第12期39-45,共7页Video Engineering

摘　　要：为了使H.265硬编码器尽可能降低编码延时,同时减少因越来越高的视频质量带来的日益剧增的存储空间、数据带宽压力,基于Zynq平台提出一种高效率的编码数据存取方案,通过分辨率检测模块实现输入视频分辨率检测,从而使系统能根据分辨率自适应控制输入视频数据存储空间的划分,控制重构图像边缘填充宽度;设计一套帧间预测数据读取框架,实现搜索框重构像素的滑动窗读取,降低DDR4带宽需求与数据读取延时;通过合理控制每次读写DDR4的突发长度,以64×64的CTU块为单位储存数据,减少访问DDR4时换行或切换Bank次数,从而进一步提高存储系统的效率。In order to make H.265 hard encoder reduce the coding delay as much as possible while reduce the increasing pressure of storage space and data bandwidth caused by higher and higher video quality, an efficient coding data access scheme is proposed based on Zynq platform. In this scheme, the resolution_ detection module realizes the input video resolution detection, so that the system can adaptive control the division of the input video data storage space and the edge filling width of the reconstructed image according to the resolution;an inter prediction data reading framework is designed for sliding reading the reconstructed pixels of search box, which effectively reduces the DDR4 bandwidth demand and data reading delay;By reasonably controlling the burst length of each reading and writing of DDR4 and storing data in units of 64×64 CTU blocks, DDR4 line feed or bank switching can be reduced, so as to further improve the efficiency of the storage system.

关 键 词：H.265硬编码器 自适应分辨率 滑动窗读取 CTU块存储 

分 类 号：TP311.5[自动化与计算机技术—计算机软件与理论]