METHOD AND APPARATUS FOR USING AN ULTRA-LOW DELAY MODE OF A HYPOTHETICAL REFERENCE DECODER

摘要

A method and apparatus are provided for using an ultra-low delay mode of a hypothetical reference decoder. The method is provided in a video decoder, and includes defining (320) a hypothetical reference decoder timing model to specify timing constraints based on an arrival time and a removal time of hypothetical reference decoder access units included in a video bitstream with respect to a hypothetical reference decoder buffer. The hypothetical reference decoder access units are selected from among a slice access unit and a picture access unit. The method also includes evaluating (325) the video bitstream for conformance to requirements of the hypothetical reference decoder buffer based on the hypothetical reference decoder timing model.

主权项

1. A method, comprising:
receiving at a buffer of a hypothetical reference decoder an access unit of an encoded video bitstream; defining a timing model to specify an arrival time of the access unit at the buffer and a removal time of the access unit from the buffer; evaluating (325) the video bitstream for conformance to requirements of the hypothetical reference decoder based on the timing model; wherein the hypothetical reference decoder determines that the access unit is a slice if an indicator of ultra-low delay mode is set and that the access unit is a picture if the indicator of ultra-low delay mode is not set, and wherein the hypothetical reference decoder determines an arrival time of the access unit based on an initial arrival time of the access unit and an earliest initial arrival time of the access unit.