Conformance and inoperability improvements in multi-layer video coding

A device for processing video data comprising:

• a memory configured to store coded video data, the coded video data having a plurality of output operation points;
• and
• a processor operably coupled to the memory and configured to:
• extract a selected output operation point from the plurality of output operation points, the selected output operation point being a sub-bitstream of an entire bitstream;
• perform a first bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an entire bitstream with only the base layer to be output, and a temporal subset of the entire bitstream with only the base layer to be output, the first bitstream conformance test being based on a set of sequence-level hypothetical reference decoder (HRD) parameters in an active sequence parameter set (SPS) for a base layer, and one or more non-nested supplemental enhancement information (SEI) messages, wherein the non-nested SEI messages comprise one of decoding unit information (DUI), buffering period (BP), and picture timing (PT) SEI messages, and the non-nested SEI messages are directly included in an SEI network abstraction layer (NAL) unit,
• perform a second bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of a layer set specified by a base video parameter set (VPS) of an active VPS and a temporal subset of the layer set with only the base layer to be output, the second bitstream conformance test being based on a set of sequence-level HRD parameters in the base VPS and directly nested SEI messages, and
• perform a third bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an output layer set (OLS) specified by a VPS extension of the active VPS and a temporal subset of the OLS, the third bitstream conformance test being based on a set of sequence-level HRD parameters in the active VPS and indirectly nested SEI messages;
• and
• apply indirectly nested SEI messages only when the selected output operation point corresponds to an OLS specified in the VPS extension, the indirectly nested SEI messages being one of BP, PT, and DUI SEI messages.

An apparatus for processing video data comprising:

• a memory means for storing coded video data, the video data having a plurality of output operation points;
• and
• a decoder means operably coupled to the memory means for:
• extracting a selected output operation point from the plurality of output operation points, the selected output operation point being a sub-bitstream of an entire bitstream;
• performing a first bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an entire bitstream with only the base layer to be output, and a temporal subset of the entire bitstream with only the base layer to be output, the first bitstream conformance test being based on a set of sequence-level hypothetical reference decoder (HRD) parameters in an active sequence parameter set (SPS) for a base layer, and one or more non-nested supplemental enhancement information (SEI) messages, wherein the non-nested SEI messages comprise one of DUI, BP, and PT SEI messages, and the non-nested SEI messages are directly included in an SEI network abstraction layer (NAL) unit,
• performing a second bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of a layer set specified by a base video parameter set (VPS) of an active VPS and a temporal subset of the layer set with only the base layer to be output, the second bitstream conformance test being based on a set of sequence-level HRD parameters in the base VPS and directly nested SEI messages,
• performing a third bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an output layer set (OLS) specified by a VPS extension of the active VPS and a temporal subset of the OLS, the third bitstream conformance test being based on a set of sequence-level HRD parameters in the active VPS and indirectly nested SEI messages;
• and
• applying indirectly nested SEI messages only when the selected output operation point corresponds to an OLS identified in the VPS extension of the active VPS, the indirectly nested SEI messages being one of BP, PT, and DUI SEI messages.

A non-transitory computer-readable medium containing instructions that when executed by a processor cause a computer to:

• receive coded video data having a plurality of output operation points;
• extract a selected output operation point from the plurality of output operation points, the selected output operation point being a sub-bitstream of an entire bitstream;
• perform a first bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an entire bitstream with only the base layer to be output, and a temporal subset of the entire bitstream with only the base layer to be output, the first bitstream conformance test being based on a set of sequence-level hypothetical reference decoder (HRD) parameters in an active sequence parameter set (SPS) for a base layer, and one or more non-nested supplemental enhancement information (SEI) messages, wherein the non-nested SEI messages comprise one of DUI, BP, and PT SEI messages, and the non-nested SEI messages are directly included in an SEI network abstraction layer (NAL) unit,
• perform a second bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of a layer set specified by a base video parameter set (VPS) of an active VPS and a temporal subset of the layer set with only the base layer to be output, the second bitstream conformance test being based on a set of sequence-level HRD parameters in the base VPS and directly nested SEI messages, and
• perform a third bitstream conformance test on the selected output operation point when the selected output operation point corresponds to one of an output layer set (OLS) specified by a VPS extension of the active VPS and a temporal subset of the OLS, the third bitstream conformance test being based on a set of sequence-level HRD parameters in the active VPS and indirectly nested SEI messages;
• and
• apply indirectly nested SEI messages only when the selected output operation point corresponds to an OLS specified in the VPS extension, the indirectly nested SE messages being one of BP, PT, and DUI SEI messages.