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Subject: Re: [PATCH v2,4/5] media: mediatek: vcodec: add MT21 format
 definition
From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
To: Yunfei Dong <yunfei.dong@mediatek.com>, =?ISO-8859-1?Q?N=EDcolas?= "F .
 R . A . Prado" <nfraprado@collabora.com>, Hans Verkuil
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 Sebastian Fricke <sebastian.fricke@collabora.com>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>, Fritz Koenig
 <frkoenig@chromium.org>,  Daniel Vetter <daniel@ffwll.ch>, Steve Cho
 <stevecho@chromium.org>, linux-media@vger.kernel.org, 
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Date: Thu, 18 Apr 2024 16:24:48 -0400
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Le mardi 09 avril 2024 =C3=A0 14:44 +0800, Yunfei Dong a =C3=A9crit=C2=A0:
> Adding the definition of MT21 format to calculate bytesperline

MT21C in the subject and description.

> and sizeimage of plane[0] and plane[1].
>=20
> Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
> ---
>  drivers/media/v4l2-core/v4l2-common.c | 2 ++
>  1 file changed, 2 insertions(+)
>=20
> diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-c=
ore/v4l2-common.c
> index 0d5de132e07f..6dba989c2291 100644
> --- a/drivers/media/v4l2-core/v4l2-common.c
> +++ b/drivers/media/v4l2-core/v4l2-common.c
> @@ -271,6 +271,8 @@ const struct v4l2_format_info *v4l2_format_info(u32 f=
ormat)
>  		  .block_w =3D { 64, 64, 0, 0 }, .block_h =3D { 64, 64, 0, 0 }},
>  		{ .format =3D V4L2_PIX_FMT_MM21, .pixel_enc =3D V4L2_PIXEL_ENC_YUV, .m=
em_planes =3D 2, .comp_planes =3D 2, .bpp =3D { 1, 1, 0, 0 }, .bpp_div =3D =
{ 1, 1, 1, 1 }, .hdiv =3D 1, .vdiv =3D 2,
>  		  .block_w =3D { 64, 64, 0, 0 }, .block_h =3D { 64, 64, 0, 0 }},
> +		{ .format =3D V4L2_PIX_FMT_MT21C, .pixel_enc =3D V4L2_PIXEL_ENC_YUV, .=
mem_planes =3D 2, .comp_planes =3D 2, .bpp =3D { 1, 1, 0, 0 }, .bpp_div =3D=
 { 1, 1, 1, 1 }, .hdiv =3D 1, .vdiv =3D 2,
> +		  .block_w =3D { 64, 64, 0, 0 }, .block_h =3D { 64, 64, 0, 0 }},

As you may notice, we have no support for compressed formats yet in this he=
lper.
I believe for these formats we need some extra code to add the header size
calculation. One way could be to add a ops in that table for when a header =
is
needed. That ops would implement the format specific extra space calculatio=
n
which would be added to sizeimage of each planes (in in one of the planes
depending on the specifics of the format).

> =20
>  		/* YUV planar formats */
>  		{ .format =3D V4L2_PIX_FMT_NV12,    .pixel_enc =3D V4L2_PIXEL_ENC_YUV,=
 .mem_planes =3D 1, .comp_planes =3D 2, .bpp =3D { 1, 2, 0, 0 }, .bpp_div =
=3D { 1, 1, 1, 1 }, .hdiv =3D 2, .vdiv =3D 2 },