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Date: Mon, 15 Jun 2020 12:48:20 +0100
From: Kieran Bingham <kieran.bingham@...asonboard.com>
To: Kaaira Gupta <kgupta@...iitr.ac.in>,
Helen Koike <helen.koike@...labora.com>,
Shuah Khan <skhan@...uxfoundation.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
hverkuil@...all.nl
Subject: Re: [PATCH v2 2/2] media: vimc: Add a control to show test pattern
colors' order
Hi Kaaira,
On 14/06/2020 21:02, Kaaira Gupta wrote:
> Add a control in VIMC to show the correct order of the colors for a
> given test pattern.
> The control can be accessed by using show_colors_order in v4l2-ctl
>
> Signed-off-by: Kaaira Gupta <kgupta@...iitr.ac.in>
> ---
> drivers/media/test-drivers/vimc/Kconfig | 2 ++
> drivers/media/test-drivers/vimc/vimc-common.h | 1 +
> drivers/media/test-drivers/vimc/vimc-sensor.c | 34 +++++++++++++++++++
> 3 files changed, 37 insertions(+)
>
> diff --git a/drivers/media/test-drivers/vimc/Kconfig b/drivers/media/test-drivers/vimc/Kconfig
> index 4068a67585f9..da4b2ad6e40c 100644
> --- a/drivers/media/test-drivers/vimc/Kconfig
> +++ b/drivers/media/test-drivers/vimc/Kconfig
> @@ -2,6 +2,8 @@
> config VIDEO_VIMC
> tristate "Virtual Media Controller Driver (VIMC)"
> depends on VIDEO_DEV && VIDEO_V4L2
> + select FONT_SUPPORT
> + select FONT_8x16
> select MEDIA_CONTROLLER
> select VIDEO_V4L2_SUBDEV_API
> select VIDEOBUF2_VMALLOC
> diff --git a/drivers/media/test-drivers/vimc/vimc-common.h b/drivers/media/test-drivers/vimc/vimc-common.h
> index ae163dec2459..52376ba6146b 100644
> --- a/drivers/media/test-drivers/vimc/vimc-common.h
> +++ b/drivers/media/test-drivers/vimc/vimc-common.h
> @@ -20,6 +20,7 @@
> #define VIMC_CID_VIMC_CLASS (0x00f00000 | 1)
> #define VIMC_CID_TEST_PATTERN (VIMC_CID_VIMC_BASE + 0)
> #define VIMC_CID_MEAN_WIN_SIZE (VIMC_CID_VIMC_BASE + 1)
> +#define VIMC_TEST_PATTERN_ORDER (VIMC_CID_VIMC_BASE + 2)
This should have the prefix CID like the others. I believe that stands
for "Control ID"
As below, I think it might warrant being a more generic name for the OSD
overlay, as it could display more than just the colour sequence.
>
> #define VIMC_FRAME_MAX_WIDTH 4096
> #define VIMC_FRAME_MAX_HEIGHT 2160
> diff --git a/drivers/media/test-drivers/vimc/vimc-sensor.c b/drivers/media/test-drivers/vimc/vimc-sensor.c
> index a2f09ac9a360..da625f6accce 100644
> --- a/drivers/media/test-drivers/vimc/vimc-sensor.c
> +++ b/drivers/media/test-drivers/vimc/vimc-sensor.c
> @@ -5,6 +5,7 @@
> * Copyright (C) 2015-2017 Helen Koike <helen.fornazier@...il.com>
> */
>
> +#include <linux/font.h>
> #include <linux/v4l2-mediabus.h>
> #include <linux/vmalloc.h>
> #include <media/v4l2-ctrls.h>
> @@ -19,6 +20,7 @@ struct vimc_sen_device {
> struct v4l2_subdev sd;
> struct tpg_data tpg;
> u8 *frame;
> + bool show_colors_order;
I would say it's the 'sequence' 'show_color_sequence' but it's still a
bit long ... but maybe that doesn't really matter.
> /* The active format */
> struct v4l2_mbus_framefmt mbus_format;
> struct v4l2_ctrl_handler hdl;
> @@ -185,10 +187,18 @@ static const struct v4l2_subdev_pad_ops vimc_sen_pad_ops = {
> static void *vimc_sen_process_frame(struct vimc_ent_device *ved,
> const void *sink_frame)
> {
> + u8 *basep[TPG_MAX_PLANES][2];
> + char *str;
> struct vimc_sen_device *vsen = container_of(ved, struct vimc_sen_device,
> ved);
>
> tpg_fill_plane_buffer(&vsen->tpg, 0, 0, vsen->frame);
> + if (vsen->show_colors_order) {
> + tpg_calc_text_basep(&vsen->tpg, basep, 0, vsen->frame);
> + str = tpg_g_color_order(&vsen->tpg);
> + tpg_gen_text(&vsen->tpg, basep, 1, 1, str);
> + }
> +
> return vsen->frame;
> }
>
> @@ -200,6 +210,14 @@ static int vimc_sen_s_stream(struct v4l2_subdev *sd, int enable)
> if (enable) {
> const struct vimc_pix_map *vpix;
> unsigned int frame_size;
> + const struct font_desc *font = find_font("VGA8x16");
> +
> + if (font == NULL) {
> + pr_err("vimc: could not find font\n");
> + return -ENODEV;
I wonder if this should instead just disable text rendering instead?
It might be reasonable to compile the kernel without the font-library ?
> + }
> +
> + tpg_set_font(font->data);
>
> /* Calculate the frame size */
> vpix = vimc_pix_map_by_code(vsen->mbus_format.code);
> @@ -269,6 +287,9 @@ static int vimc_sen_s_ctrl(struct v4l2_ctrl *ctrl)
> case V4L2_CID_SATURATION:
> tpg_s_saturation(&vsen->tpg, ctrl->val);
> break;
> + case VIMC_TEST_PATTERN_ORDER:
> + vsen->show_colors_order = ctrl->val;
> + break;
> default:
> return -EINVAL;
> }
> @@ -307,6 +328,17 @@ static const struct v4l2_ctrl_config vimc_sen_ctrl_test_pattern = {
> .qmenu = tpg_pattern_strings,
> };
>
> +static const struct v4l2_ctrl_config vimc_sen_ctrl_order = {
> + .ops = &vimc_sen_ctrl_ops,
> + .id = VIMC_TEST_PATTERN_ORDER,
Now that you've brought in support for rendering text on the frame, I
wonder if more information should be displayed just like VIVID does.
In that case, it would probably be better to have a more generic control
that enables all of the text OSD with a more generic name.
> + .name = "Show Colors Order",
> + .type = V4L2_CTRL_TYPE_BOOLEAN,
> + .min = 0,
> + .max = 1,
> + .step = 1,
> + .def = 1,
> +};
> +
> static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
> const char *vcfg_name)
> {
> @@ -323,6 +355,7 @@ static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>
> v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_class, NULL);
> v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_test_pattern, NULL);
> + v4l2_ctrl_new_custom(&vsen->hdl, &vimc_sen_ctrl_order, NULL);
> v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
> V4L2_CID_VFLIP, 0, 1, 1, 0);
> v4l2_ctrl_new_std(&vsen->hdl, &vimc_sen_ctrl_ops,
> @@ -362,6 +395,7 @@ static struct vimc_ent_device *vimc_sen_add(struct vimc_device *vimc,
>
> /* Initialize the frame format */
> vsen->mbus_format = fmt_default;
> + vsen->show_colors_order = vimc_sen_ctrl_order.def;
>
> return &vsen->ved;
>
>
--
Regards
--
Kieran
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