Research On Streaming Media Playback Method For Low Power Consumption

Low-power video playback on embedded devices has become one of the growing concerns.When playing streaming video on a traditional embedded device,the system resources are not enough to perform multitasking at the same time,and the task running slowly or even stuck often occurs.With the increasing demand for user experience and the popularity of smart hardware,how to solve this problem on resource-poor embedded devices becomes more and more important.Faced with such problems,this paper studies the decoding process of the most widely used and most scalable video codec MPEG,and designs and reconstructs the decoding algorithm to achieve low-power playback of streaming video on embedded devices.The approximation of the decoding algorithm includes two aspects: a key frame decoding approximation algorithm and a predictive frame decoding approximation algorithm.The method of decoding the approximate algorithm of the key frame is mainly to approximate the high-frequency region with less information and large amount of data in the 8*8 pixel block in the discrete cosine transform(IDCT)process in the decoding process,which reduces the redundancy.The processing of the remaining data reduces the amount of calculation,reduces the requirements on system resources,and reduces energy consumption.The method of decoding the approximation algorithm of the prediction frame is divided into two aspects: one is to judge the block with a small offset position of the motion vector of the change block,and the reference frame is used when the motion vector change is within the artificially set threshold range.The content of the corresponding block fills the current block,and the block is considered to have not changed.On the other hand,it is determined whether edge compensation is needed for the predicted frame according to the specific situation.When the effect of edge compensation is small,edge compensation may not be performed.It is considered that the edge does not change;when edge compensation is needed,the approximation algorithm of IDCT in the key frame can be applied to the decoding process of the pixel residual,thereby implementing an approximation algorithm of edge compensation.In this paper,the approximation method of MPEG decoding algorithm can enable embedded devices to reduce the CPU frequency by reducing the amount of calculation when playing video files with variable code stream in the traditional video player.Achieve the purpose of reducing system power consumption.As a result,it will be a new attempt for similar players based on MPEG decoding,which makes such players on embedded devices face the problem of insufficient system resources and equipment life time.It has a broader application area.