Re: [PATCH v4 1/4] [media] exynos-gsc: Use 576p instead 720p as a threshold for colorspaces

From: Thibault Saunier
Date: Tue Feb 21 2017 - 14:05:37 EST

Hello Andrzej,

On 02/21/2017 06:56 AM, Andrzej Hajda wrote:
On 13.02.2017 20:08, Thibault Saunier wrote:
From: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>

The media documentation says that the V4L2_COLORSPACE_SMPTE170M colorspace
should be used for SDTV and V4L2_COLORSPACE_REC709 for HDTV. But drivers
don't agree on the display resolution that should be used as a threshold.

>From EIA CEA 861B about colorimetry for various resolutions:

- 5.1 480p, 480i, 576p, 576i, 240p, and 288p
The color space used by the 480-line, 576-line, 240-line, and 288-line
formats will likely be based on SMPTE 170M [1].
- 5.2 1080i, 1080p, and 720p
The color space used by the high definition formats will likely be
based on ITU-R BT.709-4

This indicates that in the case that userspace does not specify what
colorspace should be used, we should use 576p as a threshold to set
V4L2_COLORSPACE_REC709 instead of V4L2_COLORSPACE_REC709. Even if it is
only 'likely' and not a requirement it is the best guess we can make.

The stream should have been encoded with the information and userspace
has to pass it to the driver if it is not the case, otherwise we won't be
able to handle it properly anyhow.

Also, check for the resolution in G_FMT instead unconditionally setting
the V4L2_COLORSPACE_REC709 colorspace.

Signed-off-by: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
Signed-off-by: Thibault Saunier <thibault.saunier@xxxxxxxxxxxxxxx>
Reviewed-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Hi Thibault,

Have you analyzed Hans response for the previous patchset [1] ?
I am not an expert in the subject but it seems he is right. GSCALER
datasheet uses term 'color space conversion' to describe conversions
between RGB and YCbCr, not for describe colorspaces as in V4L2.
GSC_(IN|OUT)_RGB_(HD|SD)_(WIDE|NARROW) macros used to set IN_CON and
OUT_CON registers of GSCALER are probably used incorrectly, they should
not be set according to pix_mp->colorspace but rather according to
pix_mp->ycbcr_enc and pix_mp->quantization. pix_mp->colorspace should be
just copied from output to capture side.

Please fix the patch accordingly, and if you are interested you can
prepare another patch to fix register setting.

OK, so what you describe here for the colorspace is exactly what I am doing in my next patch right?
I am going to fixup them up as suggested in your other review.

I will also have a look at fixing register setting and figure out what you explained.

Thanks for the review.


Thibault Saunier




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@xxxxxxxxxxx>'

Changes in v2: None

drivers/media/platform/exynos-gsc/gsc-core.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index 59a634201830..db7d9883861b 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -472,7 +472,7 @@ 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 */
+ if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
pix_mp->colorspace = V4L2_COLORSPACE_REC709;
else /* SD */
pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
@@ -519,9 +519,13 @@ 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;
+ if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
+ pix_mp->colorspace = V4L2_COLORSPACE_REC709;
+ else /* SD */
+ pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
for (i = 0; i < pix_mp->num_planes; ++i) {
pix_mp->plane_fmt[i].bytesperline = (frame->f_width *
frame->fmt->depth[i]) / 8;