This is what sceMpegAvcCopyYCbCr is built on, and a game that wants the raw
YCbCr rather than letting sceMpegbase convert to RGB uses it and nothing else.
mpeg.prx builds the descriptor on its own stack and avcodec.prx reads it back at
0x800015c4. Dimensions in pixels at 0x00/0x04, the eight frame buffers from 0x0c
but ordered 0,2,4,6 then 1,3,5,7, and from 0x2c the destination Y with Cb and Cr
following it contiguously - ordinary planar YUV420. Checked against what the
game passes: the eight addresses are exactly the buffers we handed out, and the
three destinations are spaced width*height and width*height/4 apart.
Un-tiling is the same operation the colour conversion already does, so that
moves out of sceMpegbase.cpp as ReadTiledYCbCr rather than being written twice.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
