prefix byte

charles Salmon-Legagneur authored 2 years ago and Xiang Li committed 2 years ago

add option --PrintRefLayerMetrics to compute and display PSNR between current layer and reference layer

Avoid having a separate PTL count since we already have a size
for the vector containing the PTLs.

Add a size check to avoid writing into inexistant PTL. This may
avoid bug reports such as #1587

Includes:
- use of const qualifier
- fix variable naming
- use named constants