linux-kernel - Re: [RFC PATCH v3 1/2] media: docs-rst: Append HEVC specific term

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Message-ID: <2095465.irdbgypaU6@jernej-laptop>
Date:   Mon, 28 Mar 2022 19:10:15 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-media@...r.kernel.org,
        Sebastian Fricke <sebastian.fricke@...labora.com>
Cc:     acourbot@...omium.org, tfiga@...omium.org,
        hverkuil-cisco@...all.nl,
        Sebastian Fricke <sebastian.fricke@...labora.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chen-Yu Tsai <wens@...e.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:STAGING SUBSYSTEM" <linux-staging@...ts.linux.dev>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Allwinner sunXi SoC support" 
        <linux-sunxi@...ts.linux.dev>
Subject: Re: [RFC PATCH v3 1/2] media: docs-rst: Append HEVC specific term

Dne nedelja, 27. marec 2022 ob 10:43:08 CEST je Sebastian Fricke napisal(a):
> Describe the coding tree unit as replacement for the macroblock in the
> HEVC codec. Highlight a key difference of the HEVC codec to predecessors
> like AVC(H.264) to give a better overview of the differences between the
> coding standards.
> 

Looks good to me.

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej

> Signed-off-by: Sebastian Fricke <sebastian.fricke@...labora.com>
> ---
>  Documentation/userspace-api/media/v4l/dev-decoder.rst | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/dev-decoder.rst
> b/Documentation/userspace-api/media/v4l/dev-decoder.rst index
> 3cf2b496f2d0..eb5b1b1e3a51 100644
> --- a/Documentation/userspace-api/media/v4l/dev-decoder.rst
> +++ b/Documentation/userspace-api/media/v4l/dev-decoder.rst
> @@ -72,6 +72,11 @@ coded resolution
>  coded width
>     width for given coded resolution.
> 
> +coding tree unit
> +   processing unit of the HEVC codec (≘ macroblock units in H.264, VP8,
> VP9); +   can use block structures of up to 64×64 pixels;
> +   Good at sub-partitioning the picture into variable sized structures.
> +
>  decode order
>     the order in which frames are decoded; may differ from display order if
> the coded format includes a feature of frame reordering; for decoders, @@
> -104,7 +109,8 @@ keyframe
>  macroblock
>     a processing unit in image and video compression formats based on linear
> block transforms (e.g. H.264, VP8, VP9); codec-specific, but for most of - 
>  popular codecs the size is 16x16 samples (pixels).
> +   popular codecs the size is 16x16 samples (pixels). The HEVC codec uses a
> +   slightly more flexible processing unit called coding tree unit (CTU).
> 
>  OUTPUT
>     the source buffer queue; for decoders, the queue of buffers containing