Multi-core DSP (digital signal processor) motion estimation-oriented data prefetching method

Abstract

The invention discloses a multi-core DSP (digital signal processor) motion estimation-oriented data prefetching method. According to the method, data of a coding block and a reference block are prefetched to a local storage according to the space relevancy of data in motion estimation and the data of a prediction motion vector prefetching coding bock and the reference block, so the parallel performing between the motion estimation operation of the current coding block and the data loading operation of the next code block and the reference block are realized, the influence of the storage to the speed of a multi-core processor in the motion estimation is reduced, and tests prove that the data prefetching method enables the motion estimation processing speed in the multi-core DSP parallel video coding to be obviously improved.

Description

technical field [0001] The invention belongs to the field of multimedia encoding and decoding, and in particular relates to a data prefetching method for motion estimation in parallel video coding of an embedded multi-core DSP processor, which is a method for accelerating video motion estimation processing through data prefetching. Background technique [0002] Motion estimation is one of the main components of video coding based on the hybrid coding framework. Motion estimation completes operations such as prediction, motion search, motion compensation, DCT transformation, and quantization in units of data blocks. In video coding, motion estimation takes data blocks as units. Processing unit, the data block of motion estimation in H.264 / AVC encoding includes macroblock (MB), sub-macroblock, block, etc., the data block of motion estimation in HEVC encoding includes coding unit (CU), prediction unit (PU) and Transform unit (TU), etc., the motion estimation of P frame needs th...

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Problems solved by technology

The existing patent application No. 200410101465.2 "Method for reading macroblock data in the process of video encoding and decoding" solves the problem of buffer hit rate failure by establishing a "macroblock address mapping table", but this method only provides a The index method of macroblock data in video frames can only reduce the impact of Cache failure, and does not realize the problem of data prefetching of reference frames in encoding. In motion estimation, data of multiple reference blocks often needs to be searched, and the amount of data is larger. , which also has a greater impact on motion estimation

The patent "data prefetching system in video processing" with the application number of 200710046929.8 implements data block prefetching by adding a "data prefetching module" between the processor and the memory, but this way of realizing prefetching by adding hardware units does not Suitable for commercial embedded DSP processors, and due to lack of synchronization mechanism, this method is not suitable for parallel implementation of multi-core DSP processors

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