David Flynn authored Feb 14, 2019 and David Flynn committed Aug 12, 2019

In order to implement the reversed bypass stream, it is necessary that
the arithmetic encoder outputs an independently decodable stream that
does not rely upon bounded read operations that insert 0xff bytes when
the entire aec sub-stream input is consumed (since there will be no
indication of the sub-stream length).

Noritaka Iguchi authored Jul 02, 2019 and David Flynn committed Aug 12, 2019

This commit allow individual QP offsets to be specified for each
LoD/RAHT layer in attribute coding.

This placeholder is for any encoder-specific per-attribute parameters
that do not belong in the SPS, APS, etc.,

Arash Vosoughi authored Jul 22, 2019 and David Flynn committed Aug 12, 2019

This commit implements the recolouring method described in m47800, which
notably uses a distance-weighted average rather than the previous
unweighted average.

Danillo Bracco Graziosi authored Jul 31, 2019 and David Flynn committed Aug 12, 2019

This commit exploits the use of fixed quantisation step sizes (due to
QP) to perform quantisation using multiplication by the reciprocal step
size.

In order to simplify the introduction of quantisation using the
multiplicative inverse, the existing quantiser state is refactored
into a Quantizer class that represents the current step size.

The quantization functions are applied to both fixed-point and unitary
precision data using the same QP.  This commit moves the implicit
conversion adjustment out of the quantiser and into the calling code.

For each 2×2×2 block, a predicted block is produced by upconverting the
previous transform level.  The prediction is transformed and subtracted
from the transformed attributes at the encoder.

David Flynn authored Feb 22, 2019 and David Flynn committed Aug 12, 2019

In order to support transform domain prediction of AC coefficients using
upsampled previously reconstructed transform levels, this commit
replaces the existing RAHT implementation with a descent based RAHT tree
traversal for both encoder and decoder with the transform performed in
units of 2×2×2 blocks.

Toshiyasu Sugio authored May 17, 2019 and David Flynn committed Aug 12, 2019

This adoption permits removal of an arithmetic coding dependency in the
predicting lod scheme when lifting_adaptive_prediction_threshold is
equal to 0.

Toshiyasu Sugio authored Jul 09, 2019 and David Flynn committed Aug 12, 2019

This functionality is now handled by the unified generation process.

Toshiyasu Sugio authored Jul 08, 2019 and David Flynn committed Aug 12, 2019

This adoption permits the unification of the single and multi
level-of-detail generation processes by always solving ties in sorting
predictors with identical weights according to relative buffer position.

A 64 bit integer can represent a three dimensional 21 bit position with
one spare bit.  In order te allow the computation of abs(a-b), a signed
representation should be used, making use of the full 64 bits.

Toshiyasu Sugio authored Jul 02, 2019 and David Flynn committed Aug 12, 2019

This commit makes all lod layers order points in a consistent,
ascending, morton order.

Toshiyasu Sugio authored May 10, 2019 and David Flynn committed Aug 05, 2019

This adoption fixes an issue whereby intra lod prediction is not applied
to the top layer.  By fixing this, intra lod prediction will be used for
the single-layer case.

This updates Makefile.tmc13-step to be compatible with pc_error v0.13

This commit fixes an error whereby current the slice and tile ids
would be reset to zero at the start of each geometry slice, causing the
slice and tile ids set by the partitioning method to be overwritten.

Maintains contexts for:
 64->6:    0n, ud, 1n, 2nh, 2nv, 3n
 64->6->5: 0n, ud+1n, 2nh, 2nv, 3n
 64->6->3: 0n, ud+1n+2nh, 2nv+3n

Where ud = up/down,
      1n = single neighbour
      2nh = two horizontal neighbours
      2nv = two vertical neighbours
      3n = three neighbours
      0n = no neighbours

When the same geom_box_log2_scale is used for all slices, it is not
necessary to store them in slice headers.  This commit permits
signalling of the common value in the GPS.

Toshiyasu Sugio authored Mar 01, 2019 and David Flynn committed Apr 16, 2019

This commit introduces prediction by previously coded points within
the same level of detail using the predicting attribute coder.
The feature is controlled using --intraLodPredictionEnabled=0|1.

This method has been replaced by an LoD decimation method.

Valery Valentin authored Mar 05, 2019 and David Flynn committed Apr 16, 2019

This LoD generation (subsampling) method uses the Morton-based ordering
of points that is used to determine prediction neighbours.  Each LoD
level comprises 3/4 of the points of the previous.

Toshiyasu Sugio authored Mar 01, 2019 and David Flynn committed Apr 16, 2019

This commit introduces zero run length coding for attribute residual
value along with an eq1 flag which indicates if residual value is equal
to 1 based on the current residual coding specification. In zero run
length coding, the number of zeros prior to each residual value is
counted as zerorun, and then zerorun is encoded instead of encoding
sequence of 0s

This commit permits signalling a per-slice delta QP for luma and
chroma attribute components.  The delta is relative to the base
value derived from the APS.

NB: while syntax support and derivation processes are provided,
this commit does not contain any method to control the delta
QP value at the encoder.

Noritaka Iguchi authored Mar 27, 2019 and David Flynn committed Apr 16, 2019

This commit introduces control of the quantisation step size using
the familiar HEVC | AVC quantisation parameter.

This commit adds an extra contextualisation bit for occupancy coding
based on there being an unoccupied adjacent child neighbour, rather
than just depending upon the number of occupied neighbours.

This proposal reduces the number of neighbour configurations used
in occupancy contextualisation from {10, 10, 10, 10, 10, 10, 7, 5}
to {9, 9, 9, 9, 5, 5, 3, 2} by replacing the 64-to-10, 10-to-7,
and 10-to-5 mapping tables with 64-to-9, 9-to-5, and 9-to-3 tables.

This commit updates the geometry octree node occupancy map scan order
to permit better screening of b6 from the right.

The integration of m43781 fast lifting for lossy attributes removes the
need for PCCIncrementalKdTree3.

This function has never been used.