Signaling data for long term reference pictures for video coding

A method of encoding video data, the method comprising:

• encoding syntax element data for a plurality of pictures in a picture coding order, wherein the syntax element data indicates that each of the plurality of pictures is available for use as a long term reference picture;
• encoding a slice header for a slice of the video data, wherein the slice header includes a syntax element indicating a number of long term reference pictures derived from a sequence parameter set;
• determining whether a long term reference picture of the plurality of pictures is explicitly signaled in the slice header or derived from the sequence parameter set corresponding to the slice;
• when the long term reference picture is explicitly signaled, wherein encoding the slice header further comprises encoding a value for identifying information for the long term reference picture in the slice header;
• and
• determining that a value for DeltaPocMSBCycleLt [i] of the long term reference picture having index value i is always equal to a value for a syntax element delta_poc_msb_cycle_lt_[i] of the long term reference picture having index value i when the long term reference picture has the index value i equal to the number of long term reference pictures derived from the sequence parameter set.

A device for coding video, the device comprising:

• means for coding syntax element data for a plurality of pictures in a picture coding order, wherein the syntax element data indicates that each of the plurality of pictures is available for use as a long term reference picture;
• means for coding a slice header for a slice of the video data, wherein the slice header includes a syntax element indicating a number of long term reference pictures derived from a sequence parameter set;
• means for determining whether a long term reference picture of the plurality of pictures is explicitly signaled in the slice header or derived from the sequence parameter set corresponding to the slice;
• the means for coding the slice header further comprising means for coding a value for identifying information for the long term reference picture in the slice header when the long term reference picture is explicitly signaled;
• and
• means for determining that a value for DeltaPocMSBCycleLt [i] of the long term reference picture having index value i is always equal to a value for a syntax element delta_poc_msb_cycle_lt_[i] of the long term reference picture having index value i when the long term reference picture has the index value i equal to the number of long term reference pictures derived from the sequence parameter set.

A device for coding video data, the device comprising:

• a memory configured to store the video data;
• and
• one or more processors configured to:
• code syntax element data for a plurality of pictures in a picture coding order, wherein the syntax element data indicates that each of the plurality of pictures is available for use as a long term reference picture;
• code a slice header for a slice of the video data, wherein the slice header includes a syntax element indicating a number of long term reference pictures derived from sequence parameter set;
• determine whether a long term reference picture of the plurality of pictures is explicitly signaled in the slice header or derived from the sequence parameter set corresponding to the slice;
• when the long term reference picture is explicitly signaled, decode a value for identifying information for the long term reference picture in the slice header;
• and
• determine that a value for DeltaPocMSBCycleLt [i] of the long term reference picture having index value i is always equal to a value for a syntax element delta_poc_msb_cycle_lt_[i] of the long term reference picture having index value i when the long term reference picture has the index value i equal to the number of long term reference pictures derived from the sequence parameter set.

A non-transitory computer-readable storage medium having stored thereon instructions that, when executed, cause a processor to:

• code syntax element data for a plurality of pictures in a picture coding order, wherein the syntax element data indicates a number of long term reference pictures derived from a sequence parameter set;
• code a slice header for a slice of the video data, wherein the slice header includes a syntax element comprising identifying information for a long term reference picture of the plurality of pictures;
• determine whether a long term reference picture of the plurality of pictures is explicitly signaled in the slice header or derived from the sequence parameter set corresponding to the slice;
• when the syntax element indicates that the identifying information for the long term reference picture is explicitly signaled, to code the slice header, the instructions cause the processor to code a value for identifying information for the long term reference picture in the slice header;
• and
• determine that a value for DeltaPocMSBCycleLt [i] of the long term reference picture having index value i is always equal to a value for a syntax element delta_poc_msb_cycle_lt_[i] of the long term reference picture having index value i when the long term reference picture has the index value i equal to the number of long term reference pictures derived from the sequence parameter set.