Multi-core parallel video decoding method for allocating tasks and data by row in staggered manner

Abstract

The invention provides a multi-core parallel video decoding method for allocating tasks and data by row in a staggered manner. Shared image data is allocated and processed according to the following steps: (11) image data of an HxW image and processing tasks thereof are allocated to m cores by code stream basic unit row in a staggered manner, wherein the 0th row is allocated to the core 0, the 1st row is allocated to the core 1, the 2nd row is allocated to the core 2,..., the core i processes the ith, (i+m)th, (i+2*m)th,..., (i+q*m)th (i+q*m<H / 16k-1) rows of code stream basic units, each core processes video decoding of an hxW sub image, and h=[H / m+0,5]; and (12) after allocation, the mapping relationship from the global row coordinates of the complete image to the core number and the local row coordinates of the sub images thereof is as follows: the image Y component row coordinate mapping is global_y=core number*16k+local_y*m, the image U and V component row coordinate mapping is global_y=core number*8k+local_y*m, the code stream basic unit row coordinate mapping is global_mb_y=core number+local_mb_y *m. After the tasks are allocated to the multiple cores, data caches are correspondingly allocated to the multiple cores, and equilibrium is achieved for all. The shared data access efficiency and the parallel speed-up ratio are significantly improved.

Description

technical field [0001] The present invention relates to the technical field of video coding, in particular to a multi-core parallel video decoding method using a multi-core digital signal processor DSP chip to complete high-definition video encoding, decoding and transmission, as well as optimization measures for load sharing, execution waiting and blocking, and cache memory during multi-core parallelism. Background technique [0002] In the 1980s, the mutual penetration and integration of 3C (Computers, Communications, Consumer Electronics) gave birth to multimedia technology and promoted the rapid development and popularization of multimedia technology. Video coding is a key technology in multimedia technology. In recent years, the clarity of transmitted video has been continuously improved, and at the same time, video coding standards have been frequently updated, and new content has continued to emerge. In 2002, CIFH.263 still occupied the mainstream in conference TV eq...

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