Motion Vector Reconstruction in Entropy Decoder Pipeline
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Solution Overview
Problem
Digital video decoders and encoders face challenges in achieving high performance and low power consumption while adhering to complex video standards, particularly due to the conditional presence of the HYBRIDPRED syntax element which depends on reconstructed luma motion vectors, making it difficult to parse the input bit stream and reconstruct motion vectors in pipelined architectures.
Innovation Solution
A system and method for motion vector reconstruction in an entropy decoder that allows for the reconstruction of motion vectors within the entropy decoding process, enabling the detection of syntax elements like HYBRIDPRED, by using a circuit with an entropy decoder, motion vector reconstructor, and controller that operates in a pipelined architecture, allowing for efficient throughput and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pipelined architecture is used to improve performance and reduce power consumption, then throughput and energy efficiency are improved, but the conditional dependency of HYBRIDPRED syntax element on reconstructed motion vectors creates parsing complexity and potential pipeline stalls
Solution Approach 1:
The patent performs motion vector reconstruction in advance during the entropy decoding stage, before the HYBRIDPRED syntax element needs to be parsed. By pre-reconstructing motion vectors and storing them in a buffer, the system eliminates the dependency chain that would otherwise cause pipeline stalls or complex inter-stage communication in pipelined architectures.
Solution Approach 2:
The patent divides the decoding process into distinct functional stages: entropy decoding, motion vector reconstruction, and syntax element parsing. Each stage operates independently with well-defined data flow interfaces, allowing the pipelined architecture to maintain high throughput while managing complexity through modular functional separation.
2Ease of operation
If motion vector reconstruction is performed in a later pipeline stage, then entropy decoding can proceed independently, but the HYBRIDPRED syntax element cannot be parsed due to dependency on reconstructed luma motion vectors
Solution Approach 1:
The system performs motion vector reconstruction during the entropy decoding stage itself, before the HYBRIDPRED syntax element parsing is needed. This preliminary reconstruction allows the parser to immediately access the required motion vector data when encountering the HYBRIDPRED syntax element, eliminating the dependency conflict.
Solution Approach 2:
The patent introduces a motion vector buffer as an intermediary data structure that stores reconstructed motion vectors and makes them available to subsequent parsing stages. This buffer acts as a mediator that decouples the timing of motion vector reconstruction from the timing of syntax element parsing, allowing both operations to proceed independently while maintaining data availability.
3Device complexity
If a single processor performs all decoding functions, then implementation complexity is reduced, but performance and power consumption requirements cannot be met for high definition video
Solution Approach 1:
The patent divides the decoding functionality into separate hardware modules: an entropy decoder unit, a motion vector reconstructor unit, and a parser unit. Each module is optimized for its specific function and can operate in parallel, achieving high-definition video decoding performance while maintaining manageable implementation complexity through modular architecture.
Solution Approach 2:
The patent combines the motion vector reconstruction function with the entropy decoding process by performing reconstruction during the entropy decoding stage. This merging of functions into a unified processing flow eliminates the need for separate sequential processing stages, improving throughput while keeping the overall architecture compact and manageable.
Data Source
AI summary
Presented herein are system(s), method(s), and apparatus for motion vector reconstruction in an entropy decoder. In one embodiment of the present invention, there is presented a method for decoding a bitstream. The method comprises reconstructing at least one motion vector from the bitstream at a first stage in a pipeline; and entropy decoding the bitstream with the at least one reconstructed motion vector at the first stage.