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Now there are 2 mode for downscale thumbnail frame buffer 1.MPP_FRAME_THUMBNAIL_MIXED (already use on RK3528 box): Each buffer contains original output frame and 2x2 downscale small frame, small image's buffer offset will be set in frame meta info; 2.MPP_FRAME_THUMBNAIL_ONLY (newly added for rk3576 8K video): for rk3576: vop & gpu does not support 8K frame, in this case, mpp use 4K downscale buffer as decoder output Signed-off-by: Chandler Chen <chandler.chen@rock-chips.com> Change-Id: I3acf9486a657fa3e999ca16140f40b2a01ebcaf4