Internet-Draft RTP Payload Format for HEVC June 3, 2015
Because in-picture prediction between neighboring CTU rows within
a picture is allowed, the required inter-processor/inter-core
communication to enable in-picture prediction can be substantial.
The WPP partitioning does not result in the creation of more NAL
units compared to when it is not applied, thus WPP cannot be used
for MTU size matching, though slices can be used in combination
for that purpose.
Tiles define horizontal and vertical boundaries that partition a
picture into tile columns and rows. The scan order of CTUs is
changed to be local within a tile (in the order of a CTU raster
scan of a tile), before decoding the top-left CTU of the next
tile in the order of tile raster scan of a picture. Similar to
slices, tiles break in-picture prediction dependencies (including
entropy decoding dependencies). However, they do not need to be
included into individual NAL units (same as WPP in this regard),
hence tiles cannot be used for MTU size matching, though slices
can be used in combination for that purpose. Each tile can be
processed by one processor/core, and the inter-processor/inter-
core communication required for in-picture prediction between
processing units decoding neighboring tiles is limited to
conveying the shared slice header in cases a slice is spanning
more than one tile, and loop filtering related sharing of
reconstructed samples and metadata. Insofar, tiles are less
demanding in terms of inter-processor communication bandwidth
compared to WPP due to the in-picture independence between two
neighboring partitions.
1.1.4 NAL Unit Header
HEVC maintains the NAL unit concept of H.264 with modifications.
HEVC uses a two-byte NAL unit header, as shown in Figure 1. The
payload of a NAL unit refers to the NAL unit excluding the NAL
unit header.
Wang, et al Expires December 3, 2015 [Page 16]
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