linux-kernel - Re: [PATCH v2 3/4] [media] s5p-mfc: Set colorspace in VIDIO_{G,TRY}

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Date:   Fri, 10 Feb 2017 08:03:28 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Thibault Saunier <thibault.saunier@....samsung.com>,
        linux-kernel@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Andi Shyti <andi.shyti@...sung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Inki Dae <inki.dae@...sung.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-media@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 3/4] [media] s5p-mfc: Set colorspace in VIDIO_{G,TRY}_FMT

On 09.02.2017 21:04, Thibault Saunier wrote:
> The media documentation says that the V4L2_COLORSPACE_SMPTE170M colorspace
> should be used for SDTV and V4L2_COLORSPACE_REC709 for HDTV but the driver
> didn't set the colorimetry, also respect usespace setting.
>
> Use 576p display resolution as a threshold to set this.
>
> Signed-off-by: Thibault Saunier <thibault.saunier@....samsung.com>
> ---
>  drivers/media/platform/s5p-mfc/s5p_mfc_dec.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> index 367ef8e8dbf0..960d6c7052bd 100644
> --- a/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> +++ b/drivers/media/platform/s5p-mfc/s5p_mfc_dec.c
> @@ -354,6 +354,15 @@ static int vidioc_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
>  		pix_mp->plane_fmt[0].sizeimage = ctx->luma_size;
>  		pix_mp->plane_fmt[1].bytesperline = ctx->buf_width;
>  		pix_mp->plane_fmt[1].sizeimage = ctx->chroma_size;
> +
> +		if (pix_mp->colorspace != V4L2_COLORSPACE_REC709 &&
> +			pix_mp->colorspace != V4L2_COLORSPACE_SMPTE170M &&
> +			pix_mp->colorspace != V4L2_COLORSPACE_DEFAULT) {
> +		  if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
> +			pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> +		  else /* SD */
> +			pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
> +		}

Again, in g_fmt you should not check values of fields you have to fill.


Regards
Andrzej

>  	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
>  		/* This is run on OUTPUT
>  		   The buffer contains compressed image
> @@ -378,6 +387,7 @@ static int vidioc_g_fmt(struct file *file, void *priv, struct v4l2_format *f)
>  static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f)
>  {
>  	struct s5p_mfc_dev *dev = video_drvdata(file);
> +	struct v4l2_pix_format_mplane *pix_mp = &f->fmt.pix_mp;
>  	struct s5p_mfc_fmt *fmt;
>  
>  	mfc_debug(2, "Type is %d\n", f->type);
> @@ -405,6 +415,15 @@ static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f)
>  			mfc_err("Unsupported format by this MFC version.\n");
>  			return -EINVAL;
>  		}
> +
> +		if (pix_mp->colorspace != V4L2_COLORSPACE_REC709 &&
> +			pix_mp->colorspace != V4L2_COLORSPACE_SMPTE170M &&
> +			pix_mp->colorspace != V4L2_COLORSPACE_DEFAULT) {
> +		  if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
> +			pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> +		  else /* SD */
> +			pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
> +		}
>  	}
>  
>  	return 0;