System and method for video coding

An encoder, comprising:

• circuitry;
• memory coupled to the circuitry;
• wherein the circuitry, in operation:
• sets a first flag indicating whether a CCALF (cross component adaptive loop filtering) process is enabled for a first block, the first block located adjacent to a left side of a current block;
• sets a second flag indicating whether the CCALF process is enabled for a second block, the second block located adjacent to an upper side of the current block;
• determines a first index associated with a color component of the current block;
• derives a second index indicating a context model, using an equation that is a function of the first flag, the second flag, and the first index, the equation being used to derive a third index indicating another context model for an ALF (adaptive loop filtering) control flag;
• performs entropy encoding of a third flag indicating whether the CCALF process is enabled for the current block, using the context model indicated by the second index, and
• performs the CCALF process on the current block in response to the third flag indicating the CCALF process is enabled for the current block.