Conditional signalling of reference picture list modification information

摘要

Innovations in signaling of reference picture list (“RPL”) modification information. For example, a video encoder evaluates a condition that depends at least in part on a variable indicating a number of total reference pictures. Depending on the results of the evaluation, the encoder signals in a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. A video decoder evaluates the condition and, depending on results of the evaluation, parses from a bitstream a flag that indicates whether an RPL is modified according to syntax elements explicitly signaled in the bitstream. The condition can be evaluated as part of processing for an RPL modification structure that includes the flag, or as part of processing for a slice header. The encoder and decoder can also evaluate other conditions that affect syntax elements for list entries of the RPL modification information.

主权项

1. A computing device comprising memory and one or more processing units, wherein the computing device implements a video encoder system that includes:
a buffer configured to receive video frames; and a video encoder configured to perform encoding of the video frames, wherein the encoding of the video frames includes:
evaluating a condition, wherein the condition depends at least in part on whether a value of a variable that indicates a number of total reference pictures is greater than 1; anddepending on whether the condition is satisfied, conditionally signaling in a bitstream a flag that indicates whether a reference picture list (“RPL”) is modified according to syntax elements explicitly signaled in the bitstream.