HRD Parameter Adaptation for CL-RAS Picture Conformance

The patent applies dynamics by making the reference picture buffer management adaptive based on the presence or absence of CL-RAS pictures. The decoder dynamically adjusts its behavior: when CL-RAS pictures are present, it uses one set of HRD parameter interpretation rules, and when they are absent, it uses another set. This dynamic adaptation resolves the contradiction by allowing simple decoding operations while maintaining correctness through context-aware buffer management.

The patent changes the interpretation of HRD parameters based on the decoding context. Specifically, it modifies how removal delay parameters are interpreted and applied depending on whether CL-RAS pictures are present in the bitstream. This parameter adaptation allows the same decoding machinery to handle both cases correctly without increasing complexity, thus resolving the contradiction between simple decoding and correct results.

The patent makes buffer management dynamic by conditionally removing CL-RAS pictures based on their decodability status. Instead of always removing or never removing them, the system adapts its behavior: when CL-RAS pictures are not correctly decodable, they are removed with adjusted timing; when they are decodable, they are retained. This dynamic approach maintains frame rate and conformance while keeping buffer management relatively simple.

The patent performs preliminary determination of CL-RAS picture decodability before buffer management decisions are made. By预先 (in advance) identifying which CL-RAS pictures are not correctly decodable, the system can apply the correct removal timing and HRD parameter interpretation beforehand, avoiding complex runtime buffer management while maintaining frame rate and conformance requirements.

The patent changes the interpretation of HRD parameters based on the presence of CL-RAS pictures. When CL-RAS pictures are present, the system applies modified interpretation rules for removal delay parameters that account for their special status. This parameter adaptation maintains conformance to video coding standards while keeping the overall system relatively simple by building upon standard parameter structures rather than creating entirely new ones.

The patent introduces an intermediary layer of logic that sits between the standard HRD parameters and the actual buffer management operations. This intermediary interprets the standard parameters and adapts them appropriately based on the presence of CL-RAS pictures, thereby maintaining conformance without requiring complete redesign of the parameter interpretation mechanism.