Coding systems
In an implementation, a supplemental sequence parameter set (“SPS”) structure is provided that has its own network abstraction layer (“NAL”) unit type and allows transmission of layer-dependent parameters for non-base layers in an SVC environment. The supplemental SPS structure also may be used for view information in an MVC environment. In a general aspect, a structure is provided that includes (1) information ( 1410 ) from an SPS NAL unit, the information describing a parameter for use in decoding a first-layer encoding of a sequence of images, and (2) information ( 1420 ) from a supplemental SPS NAL unit having a different structure than the SPS NAL unit, and the information from the supplemental SPS NAL unit describing a parameter for use in decoding a second-layer encoding of the sequence of images. Associated methods and apparatuses are provided on the encoder and decoder sides, as well as for the signal.
1. A method comprising:
accessing information from a sequence parameter set (“SPS”) network abstraction layer (“NAL”) unit, the information describing a parameter for use in decoding a first-layer encoding of an image in a sequence of images;
accessing supplemental information from a supplemental SPS NAL unit having an available NAL unit type code that is a different NAL unit type code from that of the SPS NAL unit, and having a different syntax structure than the SPS NAL unit, and the supplemental information from the supplemental SPS NAL unit describing a parameter for use in decoding a second-layer encoding of the image in the sequence of images; and
decoding the first-layer encoding, and the second-layer encoding, based on, respectively, the accessed information from the SPS NAL unit, and the accessed supplemental information from the supplemental SPS NAL unit.
2. The method of claim 1 wherein the parameter for use in decoding the second-layer encoding comprises a video usability information (“VUI”) parameter.
3. The method of claim 1 wherein the parameter for use in decoding the first-layer encoding comprises a HRD parameter.