linux-kernel - Re: [PATCH] media: vivid: Support 480p for webcam capture

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Date:   Wed, 3 Oct 2018 16:08:58 +0900
From:   Keiichi Watanabe <keiichiw@...omium.org>
To:     Linux Media Mailing List <linux-media@...r.kernel.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Ricky Liang <jcliang@...omium.org>,
        Shik Chen <shik@...omium.org>,
        Keiichi Watanabe <keiichiw@...omium.org>
Subject: Re: [PATCH] media: vivid: Support 480p for webcam capture

I think 480p is a common frame size and it's worth supporting in vivid.
But, my patch might be ad-hoc. Actually, I'm not sure which values are
suitable for the intervals.

We might want to add a more flexible/extensible way to specify frame sizes.
e.g. passing frame sizes and intervals as module parameters

Kei

On Wed, Oct 3, 2018 at 4:06 PM, Keiichi Watanabe <keiichiw@...omium.org> wrote:
> Support 640x480 as a frame size for video input devices of vivid.
>
> Signed-off-by: Keiichi Watanabe <keiichiw@...omium.org>
> ---
>  drivers/media/platform/vivid/vivid-vid-cap.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/platform/vivid/vivid-vid-cap.c b/drivers/media/platform/vivid/vivid-vid-cap.c
> index 58e14dd1dcd3..da80bf4bc365 100644
> --- a/drivers/media/platform/vivid/vivid-vid-cap.c
> +++ b/drivers/media/platform/vivid/vivid-vid-cap.c
> @@ -51,7 +51,7 @@ static const struct vivid_fmt formats_ovl[] = {
>  };
>
>  /* The number of discrete webcam framesizes */
> -#define VIVID_WEBCAM_SIZES 5
> +#define VIVID_WEBCAM_SIZES 6
>  /* The number of discrete webcam frameintervals */
>  #define VIVID_WEBCAM_IVALS (VIVID_WEBCAM_SIZES * 2)
>
> @@ -59,6 +59,7 @@ static const struct vivid_fmt formats_ovl[] = {
>  static const struct v4l2_frmsize_discrete webcam_sizes[VIVID_WEBCAM_SIZES] = {
>         {  320, 180 },
>         {  640, 360 },
> +       {  640, 480 },
>         { 1280, 720 },
>         { 1920, 1080 },
>         { 3840, 2160 },
> @@ -75,6 +76,8 @@ static const struct v4l2_fract webcam_intervals[VIVID_WEBCAM_IVALS] = {
>         {  1, 5 },
>         {  1, 10 },
>         {  1, 15 },
> +       {  1, 15 },
> +       {  1, 25 },
>         {  1, 25 },
>         {  1, 30 },
>         {  1, 50 },
> --
> 2.19.0.605.g01d371f741-goog
>