Change #275172

Comments

avcodec/psymodel: add pair-synced window switching hook and pair state
Divergent block switching between the two channels of a CPE disables
common_window, and with it every joint stereo tool, on exactly the
frames that need them most; the lone short channel then codes its
transient alone, which is audible as one-channel garble at beats.

Add an optional window_pair() model hook so a psy model can decide both
channels of a pair together, and encoder-fed per-pair state: the
joint-tool candidacy fraction EMA and a Schmitt-gated decouple flag,
letting the model fall back to independent per-channel switching on
content whose joint tools are dead (diffuse, decorrelated pairs) where
forcing a common grid only costs quality.

Changed files

• libavcodec/psymodel.h