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Currently, the picture size is set to the CAPTURE buffer but CAPTURE buffer
references the picture size of the OUTPUT buffer.
If the picture size if set to CAPTURE, Hantro will ignore it and use the
OUTPUT picture size which is not set, therefore using the minimum size
available (48x48).
This patch sets the picture size to the OUTPUT buffer instead of the
CAPTURE buffer following the initialization specification for m2m stateless
video decoder [1].

[1] https://hverkuil.home.xs4all.nl/codec-api/uapi/v4l/dev-stateless-decoder.html#initialization

BUG=chromium:1009935
TEST=ran video_decode_accelerator_tests with test-25fps.h264 and test-25fps.vp8 on
veyron_minnie-kernelnext.
Signed-off-by: Francois Buergisser <fbuergisser@chromium.org>
Change-Id: Ib343d8a0b177470aa39018141170212c1f524979
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1832851Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703231}