The final ANS state gets further compacted because aliasing the super
frame marker is not an issue.
Change-Id: I26208accb117a6748abb6f1c32c28fadbc48de09
This should have no effect on the bitstream format (see also no related
encoder change). This is like moving code from the top of the loop to
the bottom of the loop.
This change allows us to:
* Make sure we consume the final renormalization byte after the last
symbol in an ANS partition.
* Move back toward a single renormalization operation for some ANS modes
since we know the bounds of the state mutation algorithm that got us out
of the valid state range.
Change-Id: Ia80246fd0ed805aa61b913a362546b3f08e4d79c
The new prefixes are
0: 15 bits of state are added to the base state.
10: 22 bits of state are added to the base state.
110: Reserved for super frame marker
111: 29 bits of state are added to the base state.
The likelihood of any final state is proportional to 1 / state. Given a
state range of [2**15, 2 **23) this should save on average 0.4 bits
per serialized final state.
BDRATE
subset1: -.000%
lowres: -.010%
Change-Id: I8e66e4a6667f5692c541083e6d6edc35ff411181
(cherry picked from aom/master commit 11206c60d9)
Includes renames in a bunch of places not handled by the original
due to differing tree states.
Change-Id: Ic74d9d8850b8c80a51e55e425bbf472a67e2653f
This brings it in line with the Daala CDFs and will make it easier to
share code.
Change-Id: Idfd2d2b33c3b9b2c4e72ce72fb3d8039013448b9
(cherry picked from aom/master commit af98507ca9)
Alex Converse
David Barker