Picture flushing and decoded picture buffer parameter inference for multi-layer bitstreams

A method of coding video information, comprising:

• using one or more computing devices comprising computer hardware:
• storing video data associated with a plurality of layers including a reference layer, the memory comprising a decoded picture buffer (DPB) associated with each layer;
• obtaining, from the reference layer, an intra random access point (IRAP) picture in a current access unit (AU) to be coded;
• determining whether the reference layer IRAP picture activates a new video parameter set (VPS) or is associated with a NoClrasOutputFlag having a value of 1, the NoClrasOutputFlag indicative of whether a cross-layer random access skip (CL-RAS) picture is to be output;
• and
• in response to determining that the reference layer RAP picture activates a new VPS or is associated with a NoClrasOutputFlag having a value of 1, removing pictures in the DPB associated with each of the plurality of layers;
• or
• in response to determining that the reference layer IRAP picture does not activate a new VPS and is not associated with a NoClrasOutputFlag having a value of 1, removing only pictures in the DPB associated with the reference layer.

A non-transitory computer readable medium comprising instructions that when executed on a processor comprising computer hardware cause the processor to:

• store video data associated with a plurality of layers including a reference layer, the memory comprising a decoded picture buffer (DPB) associated with each layer;
• obtain, from the reference layer, an intra random access point (RAP) picture in a current access unit (AU) to be coded;
• determine whether the reference layer RAP picture activates a new video parameter set (VPS) or is associated with a NoClrasOutputFlag having a value of 1, the NoClrasOutputFlag indicative of whether a cross-layer random access skip (CL-RAS) picture is to be output;
• in response to a determination that the reference layer IRAP picture activates a new VPS or is associated with a NoClrasOutputFlag having a value of 1, remove pictures in the DPB associated with each of the plurality of layers;
• and
• in response to a determination that the reference layer IRAP picture does not activate a new VPS and is not associated with a NoClrasOutputFlag having a value of 1, remove only pictures in the DPB associated with the reference layer.

An apparatus for coding video information, comprising:

• means for storing video data associated with a plurality of layers including a reference layer, the means for storing comprising a decoded picture buffer (DPB) associated with each layer;
• and
• means for obtaining, from the reference layer, an intra random access point (RAP) picture in a current access unit (AU) to be coded, the means for obtaining configured to:
• determine whether the reference layer IRAP picture activates a new video parameter set (VPS) or is associated with a NoClrasOutputFlag having a value of 1, the NoClrasOutputFlag indicative of whether a cross-layer random access skip (CL-RAS) picture is to be output;
• in response to a determination that the reference layer RAP picture activates a new VPS or is associated with a NoClrasOutputFlag having a value of 1, remove pictures in the DPB associated with each of the plurality of layers;
• and
• in response to a determination that the reference layer RAP picture does not activate a new VPS and is not associated with a NoClrasOutputFlag having a value of 1, remove only pictures in the DPB associated with the reference layer.