linux-kernel - Re: [PATCH] media: amphion: remove redundant check of colorspace in venc_s

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Message-ID: <d8cdc4c62f83161ee3239b92495fd9623fddfff1.camel@ndufresne.ca>
Date:   Tue, 06 Dec 2022 14:18:13 -0500
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        xiahong.bao@....com, ming.zhou@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] media: amphion: remove redundant check of colorspace in
 venc_s_fmt

Le mardi 29 novembre 2022 à 18:22 +0800, Ming Qian a écrit :
> record the colorspace set by user.
> if it's not supported by h264 vui, then zero will be written to vui,
> but don't modify the user setting.
> 
> Fixes: 0401e659c1f9 ("media: amphion: add v4l2 m2m vpu encoder stateful driver")
> Signed-off-by: Ming Qian <ming.qian@....com>

This seems like the right approach to me. The only down side, is that userspace
will not be aware that the encoder could not store the colorimetry into the
bitstream. What I totally agree, is that this should not prevent encoding the
stream, but the stream should also not lie about it (which this change fixes).

Acked-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

> ---
>  drivers/media/platform/amphion/venc.c | 18 ++++--------------
>  1 file changed, 4 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/platform/amphion/venc.c b/drivers/media/platform/amphion/venc.c
> index 3cbe8ce637e5..e6e8fe45fc7c 100644
> --- a/drivers/media/platform/amphion/venc.c
> +++ b/drivers/media/platform/amphion/venc.c
> @@ -250,19 +250,10 @@ static int venc_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
>  	}
>  
>  	if (V4L2_TYPE_IS_OUTPUT(f->type)) {
> -		if (!vpu_color_check_primaries(pix_mp->colorspace)) {
> -			venc->params.color.primaries = pix_mp->colorspace;
> -			vpu_color_get_default(venc->params.color.primaries,
> -					      &venc->params.color.transfer,
> -					      &venc->params.color.matrix,
> -					      &venc->params.color.full_range);
> -		}
> -		if (!vpu_color_check_transfers(pix_mp->xfer_func))
> -			venc->params.color.transfer = pix_mp->xfer_func;
> -		if (!vpu_color_check_matrix(pix_mp->ycbcr_enc))
> -			venc->params.color.matrix = pix_mp->ycbcr_enc;
> -		if (!vpu_color_check_full_range(pix_mp->quantization))
> -			venc->params.color.full_range = pix_mp->quantization;
> +		venc->params.color.primaries = pix_mp->colorspace;
> +		venc->params.color.transfer = pix_mp->xfer_func;
> +		venc->params.color.matrix = pix_mp->ycbcr_enc;
> +		venc->params.color.full_range = pix_mp->quantization;
>  	}
>  
>  	pix_mp->colorspace = venc->params.color.primaries;
> @@ -1281,7 +1272,6 @@ static void venc_init(struct file *file)
>  	f.fmt.pix_mp.width = 1280;
>  	f.fmt.pix_mp.height = 720;
>  	f.fmt.pix_mp.field = V4L2_FIELD_NONE;
> -	f.fmt.pix_mp.colorspace = V4L2_COLORSPACE_REC709;
>  	venc_s_fmt(file, &inst->fh, &f);
>  
>  	memset(&f, 0, sizeof(f));