linux-kernel - Re: [PATCH 03/10] media: uapi: h264: Split prediction weight parameters

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Message-ID: <CAPBb6MVJ+baQshWRJJrwKJ6bKss_KqHoC1xP9kvGtDqC0iFZWw@mail.gmail.com>
Date:   Sat, 25 Jul 2020 22:30:02 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     Ezequiel Garcia <ezequiel@...labora.com>
Cc:     Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>, kernel@...labora.com,
        Jonas Karlman <jonas@...boo.se>,
        Hans Verkuil <hverkuil@...all.nl>,
        Jeffrey Kardatzke <jkardatzke@...omium.org>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH 03/10] media: uapi: h264: Split prediction weight parameters

On Thu, Jul 16, 2020 at 5:23 AM Ezequiel Garcia <ezequiel@...labora.com> wrote:
>
> The prediction weight parameters are only required under
> certain conditions, which depend on slice header parameters.
>
> The slice header syntax specifies that the prediction
> weight table is present if:
>
> ((weighted_pred_flag && (slice_type == P || slice_type == SP)) || \
> (weighted_bipred_idc == 1 && slice_type == B))

This is a pretty important bit - how about mentioning in the documentation when
this new control is expected to be present, so both drivers and
userspace submit it
or omit it in a consistent manner?