A code stream parser suitable for hevc

Abstract

The invention relates to a code stream parser applicable to high efficiency video coding (HEVC). The code stream parser comprises a code stream parsing state control module, an EG0 decoding module, an adjacent upper block information and related parameter storage unit, a decoding output storage unit, a code stream first in / first out (FIFO), and a context-adaptive binary arithmetic coding (CABAC) decoding module, wherein the EG0 is 0-order sequence exponential-Golomb code; the code stream FIFO is respectively connected to the CABAC decoding module and the EG0 decoding module through buffering displacement; the EG0 decoding module is connected to the CABAC decoding module through the code stream parsing state control module; the EG0 decoding module is connected to the CABAC decoding module through the adjacent upper block information and related parameter storage unit. The code stream parser disclosed by the invention redesigns a state machine depending on syntax element division in HEVC standard, and can greatly improve data throughout; meanwhile, through storage and corresponding synchronization logic of coding tree unit context variable and independent fragment context variable, the code stream parser realizes a synchronizing function on non-independent fragment context variable specified within the HEVC standard as well as coding tree unit context variable to be synchronized.

Description

technical field [0001] The invention relates to a code stream parser suitable for HEVC, belonging to the technical field of digital video signal coding and decoding. Background technique [0002] HEVC (High Efficiency Video Codec) is a new generation of international video coding standard currently jointly formulated by the International Telecommunication Organization (ITU) and the Motion Picture Experts Group (MPEG). Compared with the current international video standard H.264 / AVC, HEVC can reduce the video bit rate by 50% while maintaining the same image quality. But correspondingly, the computational complexity of HEVC increases by 2 to 3 times. Compared with H.264, there are only two encoding methods of HEVC: 0-order order exponential Columbus encoding and CABAC encoding, and CAVLC encoding is no longer used. Like H.264, the bottleneck of stream parsing in HEVC is still CABAC decoding. [0003] Compared with the CABAC coding in H.264, the CABAC coding in HEVC has been...

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Problems solved by technology

These improvements allow the CABAC module to have greater data throughput, but also lead to changes in the decoding process

[0004] In addition to the above changes, in the specific CABAC decoding process, the initialization module in HEVC adds the storage and synchronization functions of context variables. This change makes the current CABAC section decoding module in H.264 no longer applicable

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