Deduplicate code

See merge request jvet/VVCSoftware_VTM!603

Fix build when JVET_N0242_NON_LINEAR_ALF is 0

See merge request jvet/VVCSoftware_VTM!602

Reduce scope to build with #define JVET_N0242_NON_LINEAR_ALF 0

Fix #304: pps_virtual_boundaries_pos_x/y coding

See merge request jvet/VVCSoftware_VTM!591

Align with specification the coding of pps_virtual_boundaries_pos_x and pps_virtual_boundaries_pos_y

This reverts merge request !580

JVET-N0276: Constraint flags

See merge request jvet/VVCSoftware_VTM!580

Fix #192: assign correct POC value to IRAP

See merge request jvet/VVCSoftware_VTM!586

Addresses encoder crashes when using --DecodingRefreshType=2

Fix #301: Fix JVET-N0847 scaling matrices cause mismatch

See merge request jvet/VVCSoftware_VTM!585

Ticket #297: Cleanup on obtaining TMVP C0 availability

See merge request !581

Cleanup dead enums

See merge request !579

JVET-N0847: Support scaling matrices

See merge request !562

[ticket #291] fix for context derivation of par/gtx flags

See merge request !572

[ticket #293] fix for sign data hiding

See merge request jvet/VVCSoftware_VTM!573

Implement N0124, proposal 1

See merge request !568

Philip Cowan authored 5 years ago and Karsten Suehring committed 5 years ago

Implement N0124, proposal 1, an inference rule for when single_tile_per_tile_group_flag is not present.

The change fixes the problem of encoder/decoder mismatches by removing
a no longer correct condition for sign hiding in Quant::quant(..).

As reported in ticket #291, when sig_flag is inferred, the variables
m_tmplCpDiag and m_tmplCpSum1 are not set correctly, but used for
deriving the contexts for par_glag, gt1_flag, and gt3_flag.

The provided modification fixes this issue by calling cctx.sigCtxIdAbs()
also when sig_flag is inferred (except for the last scanning position,
where a different mechanism is used).

There is no impact on coding efficiency.

Fix #289: Accessing uninitialized memory

See merge request !571

Implement N0124, proposal 2

See merge request !567

JVET-N0063: VUI

See merge request !542

ALF parameter cleanup

See merge request !569

Fix #278: Adjust HashME fast algorithm to avoid PSNR drop.

See merge request !564

Fix #286: alf_ctb_flag parsing condition for chroma

See merge request !566

Fix #285: alf_luma/chroma_coeff_delta_sign interpretation

See merge request !565

According to specification, alf_luma_coeff_delta_sign = 1 means that filtCoeff is negative. Idem with alf_chroma_coeff_delta_sign and AlfCoeffC.