面向ARM平台的音视频编码优化研究

Optimization of Audio and Video Encoder on ARM Platform

ARM是性价比很高的嵌入式内核,非常适合作音视频编码系统的CPU。ARM硬件上支持复杂的DSP操作,通常可以在一个时钟周期内完成,极大地提高了音频编码程序的运行速度。在视频编码的数据处理指令中,使用桶形移位器进行移位预处理可以增加代码密度,从而减少取指令次数;而充分利用ARM的16个通用寄存器进行数据操作,也可以减少内存存取操作。实验证明,ARM可以有效提高音视频编码的运行性能。

ARM is appropriate for audio and video encoder.In audio encoding,ARM supports digital signal processing,and thus can finish one DSP operation in one cycle.In video encoding,the running time can be reduced rapidly by making full use of 16registers and using shift operation along with other operation in one instruction.Experiment proves that ARM can dramatically improve performance of audio and video encoder.