Adaptive Deblocking Filter Parameters Update - 2020.2 English

H.264/H.265 Video Codec Unit v1.2 Solutions LogiCORE IP Product Guide (PG252)
Document ID
PG252
Release Date
2020-11-24
Version
2020.2 English

Loop filter beta and Tc offsets are configurable at frame level.

Constraints
New offset values are applied on the chosen frame and on the following frames in the decoding order.

Control-SW API:

In command file, define the settings "LF.BetaOffset" and “LF.TcOffset”. Encode Library APIs are (more details can be found in API description section)

bool AL_Encoder_SetLoopFilterBetaOffset(AL_HEncoder hEnc, int8_t iBetaOffset);
bool AL_Encoder_SetLoopFilterTcOffset(AL_HEncoder hEnc, int8_t iTcOffset);

Gstreamer

Omxh264enc/omxh265enc elements support below two mutable parameters, values can be modified during run time.

  1. loop-filter-beta-offset: Beta offset for the deblocking filter; used only when loop-filter-mode is enabled.
  2. loop-filter-alpha-c0-offset / loop-filter-tc-offset: Alpha_C0 / TC offset for the deblocking filter; used only when loop-filter-mode is enabled.