Hypothetical reference decoder parameters for partitioning schemes in video coding

A device that tests conformance to a video coding standard, the device comprising:

• one or more computer-readable storage media configured to store a bitstream that comprises an encoded representation of video data;
• and
• one or more processors configured to:
• obtain, from a bitstream that comprises an encoded representation of the video data, one or more syntax elements indicating one or more partitioning schemes for an output layer set, wherein:
• the bitstream comprises a plurality of layers,
• the output layer set consists of all layers of the plurality of layers or a proper subset of the plurality of layers;
• for each respective partitioning scheme of the one or more partitioning schemes:
• the respective partitioning scheme specifies a division of the output layer set into one or more partitions, wherein each layer in the output layer set belongs to exactly one partition in the respective partitioning scheme;
• and
• for each respective partitioning scheme of the one or more partitioning schemes:
• obtain, from a Supplemental Enhancement Information (SEI) message in the bitstream or video usability information (VUI) in a video parameter set (VPS) in the bitstream, a respective set of syntax elements indicating hypothetical reference decoder (HRD) parameter sets for the respective partitioning scheme;
• and
• for each respective partition of the respective partitioning scheme, test, based on the HRD parameter sets for the respective partitioning schemes, the respective partition for conformance to the video coding standard.

A device for encoding video data, the device comprising:

• one or more computer-readable storage media configured to store the video data;
• and
• one or more processors configured to:
• generate a bitstream that comprises an encoded representation of the video data, the bitstream comprising a plurality of layers, wherein the one or more processors are configured such that, as part of generating the bitstream, the one or more processors:
• include, in the bitstream, one or more syntax elements indicating one or more partitioning schemes for an output layer set, wherein:
• the output layer set consists of all layers of the plurality of layers or a proper subset of the plurality of layers;
• for each respective partitioning scheme of the one or more partitioning schemes:
• the respective partitioning scheme specifies a division of the output layer set into one or more partitions, wherein each layer in the output layer set belongs to exactly one partition in the respective partitioning scheme;
• and
• for each respective partitioning scheme of the one or more partitioning schemes, include, in a Supplemental Enhancement Information (SEI) message in the bitstream or video usability information (VUI) in a video parameter set (VPS) in the bitstream, a respective set of syntax elements indicating hypothetical reference decoder (HRD) parameter sets for the respective partitioning scheme;
• and
• output the bitstream.

A device for testing bitstream conformance, the device comprising:

• means for obtaining, from a bitstream that comprises an encoded representation of video data, one or more syntax elements indicating one or more partitioning schemes for an output layer set, wherein:
• the bitstream comprises a plurality of layers,
• the output layer set consists of all layers of the plurality of layers or a proper subset of the plurality of layers;
• for each respective partitioning scheme of the one or more partitioning schemes:
• the respective partitioning scheme specifies a division of the output layer set into one or more partitions, wherein each layer in the output layer set belongs to exactly one partition in the respective partitioning scheme;
• and
• means for obtaining, for each respective partitioning scheme of the one or more partitioning schemes, from a Supplemental Enhancement Information (SEI) message in the bitstream or video usability information (VUI) in a video parameter set (VPS) in the bitstream, a respective set of syntax elements indicating hypothetical reference decoder (HRD) parameter sets for the respective partitioning scheme;
• and
• means for testing, based on the HRD parameter sets for the one or more partitioning schemes, sub-bitstreams of each partition of each of the one or more partitioning schemes for conformance to a video coding standard.