基于BREW平台的H.264解码器的实现

介绍了H.264解码器在BREW平台上的实现方法,重点讨论了代码移植、优化和ARM编译过程中遇到的各种问题和相应的处理方法.并根据无线网络误码率高、误码常常造成播放中断等问题,实现了一种H.264解码器端的误码处理机制,使得解码应用程序的稳定性大大提高.在LG C910手机(ARM 9处理器)上的测试结果表明,对于QCIF格式的视频,在同时实现视频解码、显示以及QCP格式(QUALCOMM PureVoice)音频解码、播放等功能的情况下,优化后的H.264解码器仍可以达到9帧/s左右的解码和播放速度,满足了移动终端上的实时处理需求.

Implementation of H. 264 Decoder on BREW Platform

The implementation of H.264 decoder on BREW platform is introduced.It focuses on the problems existing in code trans- plantation,optimization as well as ARM compilation process and the corresponding methods to deal with.Due to the high error rate of wireless network,normal decoding and playing process may always be interrupted.To tackle this problem,an error control mechanism for the H.264 decoder is implemented.It can dramatically improve the stability of the decoder software.Test results on LG C910 mo- bile phone,which is equipped with the ARM 9 processor,show that the optimized H.264 decoder could decode and play QCIF video sequences at a speed of average 9 frames per second,while fulfilling the functions of video decoding,displaying and decoding,pla- ying of audio data with QCP format(QUALCOMM PureVoice),which can basically meet the requirements of real-time processing on mobile terminals.