Satoru KUMA authored May 31, 2019 and David Flynn committed Nov 21, 2019

This provides a means to achieve spatial scalability for a G-PCC
bitstream.  For bitstreams encoded with aps_scalable_enabled_flag set,
the decoder may partially decode the geometry octree
(minGeomNodeSizeLog2) and the corresponding point attributes.  The
functionality is achieved by constraining the LoD generation process to
align with partial geometry decoding.

This commit extends the operating range of the forward and inverse
quantization tables in order to reduce distortion at low bit rates.

Consider candidates that are tied according to distance with the current
worst predictor in order to consistently use the lowest indexed candidate
and to prefer neighbours in coarser LoD to neighbours in current LoD.

This fixes an issue when during predictor construction, when
lodIndex == levelOfDetailCount causing the retained set to be empty.

The clang indent rules used to tidy the code cause undue indentation
when used with include guards.  This commit switches the only remaining
instance to use pgrama once.

David Flynn authored May 06, 2019 and David Flynn committed Aug 26, 2019

This commit provides a set of MPEG::PCC perl modules that may be used to
parse TMC13 log files.  An example script collect-tmc13.pl demonstrates
their use.

basketball_player_vox11 and dancer_vox11 are reduced to 64 frames.

Wei Zhang authored Jul 10, 2019 and David Flynn committed Aug 12, 2019

This avoids artefacts during trisoup generation by checking whether the
original slice partition interval is an integer multiple of the block
size W=2^(trisoup_node_size_log2). If not, the partition interval is
rounded up to the nearest integer that is exactly divisible by the block
size.

Yiting Shao authored Jun 14, 2019 and David Flynn committed Aug 12, 2019

This commit adds a process to limit the number of points per slice to be
within a hard upper limit and soft lower limit.

Yiting Shao authored Jun 14, 2019 and David Flynn committed Aug 12, 2019

Adjust the operation sequence of slice partition and geometry quantization. We
do geometry quantization first and then do the slice partition, so that the
point number of each slice would be kept in the predefined range under
lossless/lossy geometry coding conditions.

David Flynn authored Feb 13, 2019 and David Flynn committed Aug 12, 2019

Rather than code bypass bins using a simplified mode of the
arithmetic coder, this commit adds the ability to signal bypass bins
in a separate byte-reversed sub-stream.

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