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[PATCH v6 1/2] [media] exynos-gsc: Use user configured colorspace if provided

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  [PATCH v6 1/2] [media] exynos-gsc: Use user configured colorspace if provided Thibault Saunier <thibault.saunier@osg.samsung.com> - 2017-03-01 13:00 +0100
    Re: [PATCH v6 1/2] [media] exynos-gsc: Use user configured colorspace  if provided Hans Verkuil <hverkuil@xs4all.nl> - 2017-03-10 11:40 +0100

#1590286 — [PATCH v6 1/2] [media] exynos-gsc: Use user configured colorspace if provided

Use colorspace provided by the user as we are only doing scaling and
color encoding conversion, we won't be able to transform the colorspace
itself and the colorspace won't mater in that operation.

Also always use output colorspace on the capture side.

If the user does not provide a colorspace do no make it up, we might
later while processing need to figure out the colorspace, which
is possible depending on the frame size but do not ever guess and
leak that guess to the userspace.

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Thibault Saunier <thibault.saunier@osg.samsung.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

---

Changes in v6:
- Do not ever guess colorspace

Changes in v5:
- Squash commit to always use output colorspace on the capture side
  inside this one
- Fix typo in commit message

Changes in v4:
- Reword commit message to better back our assumptions on specifications

Changes in v3:
- Do not check values in the g_fmt functions as Andrzej explained in previous review
- Added 'Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>'

Changes in v2: None

 drivers/media/platform/exynos-gsc/gsc-core.c | 9 ++++-----
 drivers/media/platform/exynos-gsc/gsc-core.h | 1 +
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index 59a634201830..0241168c85af 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -454,6 +454,7 @@ int gsc_try_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
 	} else {
 		min_w = variant->pix_min->target_rot_dis_w;
 		min_h = variant->pix_min->target_rot_dis_h;
+		pix_mp->colorspace = ctx->out_colorspace;
 	}
 
 	pr_debug("mod_x: %d, mod_y: %d, max_w: %d, max_h = %d",
@@ -472,10 +473,8 @@ int gsc_try_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
 
 	pix_mp->num_planes = fmt->num_planes;
 
-	if (pix_mp->width >= 1280) /* HD */
-		pix_mp->colorspace = V4L2_COLORSPACE_REC709;
-	else /* SD */
-		pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
+	if (V4L2_TYPE_IS_OUTPUT(f->type))
+		ctx->out_colorspace = pix_mp->colorspace;
 
 	for (i = 0; i < pix_mp->num_planes; ++i) {
 		struct v4l2_plane_pix_format *plane_fmt = &pix_mp->plane_fmt[i];
@@ -519,8 +518,8 @@ int gsc_g_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
 	pix_mp->height		= frame->f_height;
 	pix_mp->field		= V4L2_FIELD_NONE;
 	pix_mp->pixelformat	= frame->fmt->pixelformat;
-	pix_mp->colorspace	= V4L2_COLORSPACE_REC709;
 	pix_mp->num_planes	= frame->fmt->num_planes;
+	pix_mp->colorspace = ctx->out_colorspace;
 
 	for (i = 0; i < pix_mp->num_planes; ++i) {
 		pix_mp->plane_fmt[i].bytesperline = (frame->f_width *
diff --git a/drivers/media/platform/exynos-gsc/gsc-core.h b/drivers/media/platform/exynos-gsc/gsc-core.h
index 696217e9af66..715d9c9d8d30 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.h
+++ b/drivers/media/platform/exynos-gsc/gsc-core.h
@@ -376,6 +376,7 @@ struct gsc_ctx {
 	struct v4l2_ctrl_handler ctrl_handler;
 	struct gsc_ctrls	gsc_ctrls;
 	bool			ctrls_rdy;
+	enum v4l2_colorspace out_colorspace;
 };
 
 void gsc_set_prefbuf(struct gsc_dev *gsc, struct gsc_frame *frm);
-- 
2.11.1

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#1597047 — Re: [PATCH v6 1/2] [media] exynos-gsc: Use user configured colorspace if provided

On 01/03/17 12:51, Thibault Saunier wrote:
> Use colorspace provided by the user as we are only doing scaling and
> color encoding conversion, we won't be able to transform the colorspace
> itself and the colorspace won't mater in that operation.
> 
> Also always use output colorspace on the capture side.
> 
> If the user does not provide a colorspace do no make it up, we might
> later while processing need to figure out the colorspace, which
> is possible depending on the frame size but do not ever guess and
> leak that guess to the userspace.
> 
> Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
> Signed-off-by: Thibault Saunier <thibault.saunier@osg.samsung.com>
> Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
> 
> ---
> 
> Changes in v6:
> - Do not ever guess colorspace
> 
> Changes in v5:
> - Squash commit to always use output colorspace on the capture side
>   inside this one
> - Fix typo in commit message
> 
> Changes in v4:
> - Reword commit message to better back our assumptions on specifications
> 
> Changes in v3:
> - Do not check values in the g_fmt functions as Andrzej explained in previous review
> - Added 'Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>'
> 
> Changes in v2: None
> 
>  drivers/media/platform/exynos-gsc/gsc-core.c | 9 ++++-----
>  drivers/media/platform/exynos-gsc/gsc-core.h | 1 +
>  2 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
> index 59a634201830..0241168c85af 100644
> --- a/drivers/media/platform/exynos-gsc/gsc-core.c
> +++ b/drivers/media/platform/exynos-gsc/gsc-core.c
> @@ -454,6 +454,7 @@ int gsc_try_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
>  	} else {
>  		min_w = variant->pix_min->target_rot_dis_w;
>  		min_h = variant->pix_min->target_rot_dis_h;
> +		pix_mp->colorspace = ctx->out_colorspace;
>  	}
>  
>  	pr_debug("mod_x: %d, mod_y: %d, max_w: %d, max_h = %d",
> @@ -472,10 +473,8 @@ int gsc_try_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
>  
>  	pix_mp->num_planes = fmt->num_planes;
>  
> -	if (pix_mp->width >= 1280) /* HD */
> -		pix_mp->colorspace = V4L2_COLORSPACE_REC709;
> -	else /* SD */
> -		pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
> +	if (V4L2_TYPE_IS_OUTPUT(f->type))
> +		ctx->out_colorspace = pix_mp->colorspace;
>  
>  	for (i = 0; i < pix_mp->num_planes; ++i) {
>  		struct v4l2_plane_pix_format *plane_fmt = &pix_mp->plane_fmt[i];
> @@ -519,8 +518,8 @@ int gsc_g_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
>  	pix_mp->height		= frame->f_height;
>  	pix_mp->field		= V4L2_FIELD_NONE;
>  	pix_mp->pixelformat	= frame->fmt->pixelformat;
> -	pix_mp->colorspace	= V4L2_COLORSPACE_REC709;
>  	pix_mp->num_planes	= frame->fmt->num_planes;
> +	pix_mp->colorspace = ctx->out_colorspace;

You need to do the same for the ycbcr_enc, xfer_func and quantization fields.
With that in place it is fully 'colorspace compliant' :-)

Regards,

	Hans

>  
>  	for (i = 0; i < pix_mp->num_planes; ++i) {
>  		pix_mp->plane_fmt[i].bytesperline = (frame->f_width *
> diff --git a/drivers/media/platform/exynos-gsc/gsc-core.h b/drivers/media/platform/exynos-gsc/gsc-core.h
> index 696217e9af66..715d9c9d8d30 100644
> --- a/drivers/media/platform/exynos-gsc/gsc-core.h
> +++ b/drivers/media/platform/exynos-gsc/gsc-core.h
> @@ -376,6 +376,7 @@ struct gsc_ctx {
>  	struct v4l2_ctrl_handler ctrl_handler;
>  	struct gsc_ctrls	gsc_ctrls;
>  	bool			ctrls_rdy;
> +	enum v4l2_colorspace out_colorspace;
>  };
>  
>  void gsc_set_prefbuf(struct gsc_dev *gsc, struct gsc_frame *frm);
> 

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