Per-axis size caps let AV1 accept 65536x65536 frames (over 8 GiB of luma)
and did not count references or pictures in flight. A shared budget module
in deckcraft-bitstream sizes a picture with checked arithmetic, and the
AV1, VP9, HEVC and H.264 decoders refuse a picture size whose current
picture, reference slots and in-flight pictures would exceed 4 GiB (1 GiB
on 32-bit), before allocating. set_memory_budget lowers it for hosts and tests.
Co-authored-by: Cursor <cursoragent@cursor.com>
