linux-kernel - Re: [PATCH 0/2] media: rkvdec: Align decoder behavior with Hantro and Cedrus

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Message-ID: <c5393cf3-e2d1-4000-3bd1-00a09bb0ee8f@collabora.com>
Date:   Fri, 8 Oct 2021 17:01:35 +0200
From:   Andrzej Pietrasiewicz <andrzej.p@...labora.com>
To:     Chen-Yu Tsai <wenst@...omium.org>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 0/2] media: rkvdec: Align decoder behavior with Hantro and
 Cedrus

Hi Chen-Yu Tsai,

W dniu 08.10.2021 o 12:04, Chen-Yu Tsai pisze:
> Hi everyone,
> 
> While working on the rkvdec H.264 decoder for ChromeOS, I noticed some
> behavioral differences compared to Hantro and Cedrus:
> 
> 1. The driver always overrides the sizeimage setting given by userspace
>     for the output format. This results in insufficient buffer space when
>     running the ChromeOS video_decode_accelerator_tests test program,
>     likely due to a small initial resolution followed by dynamic
>     resolution change.
> 
> 2. Doesn't support dynamic resolution change.
> 
> This small series fixes both and aligns the behavior with the other two
> stateless decoder drivers. This was tested on the downstream ChromeOS
> 5.10 kernel with ChromeOS. Also compiled tested on mainline but I don't
> have any other RK3399 devices set up to test video stuff, so testing
> would be very much appreciated.
> 
> Also, I'm not sure if user applications are required to check the value
> of sizeimage upon S_FMT return. If the value is different or too small,
> what can the application do besides fail? AFAICT it can't split the
> data of one frame (or slice) between different buffers.
> 
> Andrzej, I believe the second patch would conflict with your VP9 series.
> 

The conflict is rather trivial to solve. Adopting your version does not
change in any way (neither for better nor for worse) the fluster score
I get for vp9 with rkvdec on a rockpi4 using my vp9 series.

Regards,

Andrzej

> 
> Regards
> ChenYu
> 
> Chen-Yu Tsai (2):
>    media: rkvdec: Do not override sizeimage for output format
>    media: rkvdec: Support dynamic resolution changes
> 
>   drivers/staging/media/rkvdec/rkvdec-h264.c |  5 +--
>   drivers/staging/media/rkvdec/rkvdec.c      | 40 +++++++++++-----------
>   2 files changed, 23 insertions(+), 22 deletions(-)
>