Hypothetical reference decoder for scalable video coding

A method for scalable video coding, comprising:

• determining values of variables indicating a dependency layer, temporal layer, and quality layer of a scalable layer i, i being an integer;
• determining hypothetical reference decoder (HRD) parameters corresponding to said scalable layer i, the determined HRD parameters including at least one bit rate parameter, wherein the bit rate parameter is determined based on bits for the scalable layer i and its dependent layers, wherein the determined HRD parameters further include initial coded picture buffer (CPB) removal delay, initial coded picture buffer removal delay offset, CPB removal delay, and decoded picture buffer (DPB) output delay;
• and
• generating a bit stream including the determined values of variables and determined HRD parameters, wherein the CPB removal delay and the DPB output delay are only explicitly signaled in a picture timing SEI message in the bit stream for each temporal layer, the picture timing SEI message also indicating the number of temporal layers in the bit stream, and
• wherein the CPB removal delay and the DPB output delay are determined to be the same for scalable layers corresponding to different spatial layers or quality layers at each temporal layer.

A non-transitory storage medium having stored thereon instructions for causing one or more processors to perform:

• determining values of variables included in a bit stream indicating a dependency layer, temporal layer, and quality layer of a scalable layer i, i being an integer;
• and
• determining hypothetical reference decoder (HRD) parameters corresponding to said scalable layer i, the determined HRD parameters including at least one bit rate parameter, wherein the bit rate parameter is determined based on bits for the scalable layer i and its dependent layers, wherein the determined HRD parameters further include initial coded picture buffer (CPB) removal delay, initial coded picture buffer removal delay offset, CPB removal delay, and decoded picture buffer (DPB) output delay, wherein the determining HRD parameters comprises:
• determining the CPB removal delay and the DPB output delay by using explicitly signaled parameters from a picture timing SEI message in the bit stream for each temporal layer, wherein the picture timing SEI message also indicates the number of temporal layers in the bit stream, and
• determining the CPB removal delay and the DPB output delay to be the same for scalable layers corresponding to different spatial layers or quality layers at each temporal layer.

A non-transitory storage medium having stored thereon instructions for causing one or more processors to perform:

• determining values of variables indicating a dependency layer, temporal layer, and quality layer of a scalable layer i, i being an integer;
• determining hypothetical reference decoder (HRD) parameters corresponding to said scalable layer i, the determined HRD parameters including at least one bit rate parameter, wherein the bit rate parameter is determined based on bits for the scalable layer i and its dependent layers, wherein the determined HRD parameters further include initial coded picture buffer (CPB) removal delay, initial coded picture buffer removal delay offset, CPB removal delay, and decoded picture buffer (DPB) output delay;
• and
• generating a bit stream including the determined values of variables and determined HRD parameters, wherein the CPB removal delay and the DPB output delay are only explicitly signaled in a picture timing SEI message in the bit stream for each temporal layer, the picture timing SEI message also indicating the number of temporal layers in the bit stream, and
• wherein the CPB removal delay and the DPB output delay are determined to be the same for scalable layers corresponding to different spatial layers or quality layers at each temporal layer.