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Date: Sat, 9 Nov 2019 12:50:03 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Guilherme Alcarde Gallo <gagallo7@...il.com>,
helen.koike@...labora.com, drocha.figueiredo@...il.com,
skhan@...uxfoundation.org, mchehab@...nel.org,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
lkcamp@...ts.libreplanetbr.org, kieran.bingham@...asonboard.com,
jacopo@...ndi.org, laurent.pinchart@...asonboard.com,
niklas.soderlund@...natech.se, gabrielabittencourt00@...il.com,
pedro@...raco.de
Subject: Re: [PATCH v4] media: vimc: Implement get/set selection in sink
On 11/8/19 3:45 AM, Guilherme Alcarde Gallo wrote:
> Add support for the sink pad of scaler subdevice to respond
> VIDIOC_G_SELECTION and VIDIOC_S_SELECTION ioctls with the following
> targets: V4L2_SEL_TGT_COMPOSE_BOUNDS and V4L2_SEL_TGT_CROP.
>
> * Add new const struct crop_rect_default to initialize subdev scaler
> properly.
> * Make changes in sink pad format reflect to the crop rectangle. E.g.
> changing the frame format to a smaller size one can make the former
> crop rectangle selects a non existing frame area. To solve this
> situation the crop rectangle is clamped to the frame boundaries.
> * Clamp crop rectangle respecting the sink bounds during set_selection
> ioctl.
>
> Signed-off-by: Guilherme Alcarde Gallo <gagallo7@...il.com>
> Co-developed-by: Danilo Figueiredo Rocha <drocha.figueiredo@...il.com>
> Signed-off-by: Danilo Figueiredo Rocha <drocha.figueiredo@...il.com>
> Acked-by: Helen Koike <helen.koike@...labora.com>
>
> ---
> Changes in V4:
> * Revert an unnecessary change in headers include order.
> * Sort the declaration order for local variables in function by the size
> descending.
>
> Changes in V3:
> * Sort the headers in alphabetical order.
> * Change all functions prefix to 'vimc_sca_'.
> * Remove useless case.
> * Change commit message subject.
>
> Changes in V2:
> * Use v4l2_rect_map_inside to clamp the crop rectangle.
> * Do the crop rectangle clamping after changing sink format.
> * Implement try ioctls for selection with CROP* targets.
> * Treat tiny rectangles with area smaller than minimal dimensions of
> vimc frames.
> * Allow user to get selection when the streaming is on.
> * Reuse bound rectangle generation in a static function.
> * Disable get_selection for Source pads as we did before with
> set_selection.
> ---
> ---
> drivers/media/platform/vimc/vimc-scaler.c | 168 ++++++++++++++++++++--
> 1 file changed, 153 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/media/platform/vimc/vimc-scaler.c b/drivers/media/platform/vimc/vimc-scaler.c
> index 2f88a7d9d67b..36425cffc0ad 100644
> --- a/drivers/media/platform/vimc/vimc-scaler.c
> +++ b/drivers/media/platform/vimc/vimc-scaler.c
> @@ -8,6 +8,7 @@
> #include <linux/moduleparam.h>
> #include <linux/vmalloc.h>
> #include <linux/v4l2-mediabus.h>
> +#include <media/v4l2-rect.h>
> #include <media/v4l2-subdev.h>
>
> #include "vimc-common.h"
> @@ -18,6 +19,9 @@ MODULE_PARM_DESC(sca_mult, " the image size multiplier");
>
> #define MAX_ZOOM 8
>
> +#define VIMC_SCA_FMT_WIDTH_DEFAULT 640
> +#define VIMC_SCA_FMT_HEIGHT_DEFAULT 480
> +
> struct vimc_sca_device {
> struct vimc_ent_device ved;
> struct v4l2_subdev sd;
> @@ -25,6 +29,7 @@ struct vimc_sca_device {
> * with the width and hight multiplied by mult
> */
> struct v4l2_mbus_framefmt sink_fmt;
> + struct v4l2_rect crop_rect;
> /* Values calculated when the stream starts */
> u8 *src_frame;
> unsigned int src_line_size;
> @@ -33,22 +38,64 @@ struct vimc_sca_device {
> };
>
> static const struct v4l2_mbus_framefmt sink_fmt_default = {
> - .width = 640,
> - .height = 480,
> + .width = VIMC_SCA_FMT_WIDTH_DEFAULT,
> + .height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
> .code = MEDIA_BUS_FMT_RGB888_1X24,
> .field = V4L2_FIELD_NONE,
> .colorspace = V4L2_COLORSPACE_DEFAULT,
> };
>
> +static const struct v4l2_rect crop_rect_default = {
> + .width = VIMC_SCA_FMT_WIDTH_DEFAULT,
> + .height = VIMC_SCA_FMT_HEIGHT_DEFAULT,
> + .top = 0,
> + .left = 0,
> +};
> +
> +static const struct v4l2_rect crop_rect_min = {
> + .width = VIMC_FRAME_MIN_WIDTH,
> + .height = VIMC_FRAME_MIN_HEIGHT,
> + .top = 0,
> + .left = 0,
> +};
> +
> +static struct v4l2_rect
> +vimc_sca_get_crop_bound_sink(const struct v4l2_mbus_framefmt *sink_fmt)
> +{
> + /* Get the crop bounds to clamp the crop rectangle correctly */
> + struct v4l2_rect r = {
> + .left = 0,
> + .top = 0,
> + .width = sink_fmt->width,
> + .height = sink_fmt->height,
> + };
> + return r;
> +}
> +
> +static void vimc_sca_adjust_sink_crop(struct v4l2_rect *r,
> + const struct v4l2_mbus_framefmt *sink_fmt)
> +{
> + const struct v4l2_rect sink_rect =
> + vimc_sca_get_crop_bound_sink(sink_fmt);
> +
> + /* Disallow rectangles smaller than the minimal one. */
> + v4l2_rect_set_min_size(r, &crop_rect_min);
> + v4l2_rect_map_inside(r, &sink_rect);
> +}
> +
> static int vimc_sca_init_cfg(struct v4l2_subdev *sd,
> struct v4l2_subdev_pad_config *cfg)
> {
> struct v4l2_mbus_framefmt *mf;
> + struct v4l2_rect *r;
> unsigned int i;
>
> mf = v4l2_subdev_get_try_format(sd, cfg, 0);
> *mf = sink_fmt_default;
>
> + r = v4l2_subdev_get_try_crop(sd, cfg, 0);
> + *r = crop_rect_default;
> +
> for (i = 1; i < sd->entity.num_pads; i++) {
> mf = v4l2_subdev_get_try_format(sd, cfg, i);
> *mf = sink_fmt_default;
> @@ -107,16 +154,21 @@ static int vimc_sca_get_fmt(struct v4l2_subdev *sd,
> struct v4l2_subdev_format *format)
> {
> struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> + struct v4l2_rect *crop_rect;
>
> /* Get the current sink format */
> - format->format = (format->which == V4L2_SUBDEV_FORMAT_TRY) ?
> - *v4l2_subdev_get_try_format(sd, cfg, 0) :
> - vsca->sink_fmt;
> + if (format->which == V4L2_SUBDEV_FORMAT_TRY) {
> + format->format = *v4l2_subdev_get_try_format(sd, cfg, 0);
> + crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> + } else {
> + format->format = vsca->sink_fmt;
> + crop_rect = &vsca->crop_rect;
> + }
>
> /* Scale the frame size for the source pad */
> if (VIMC_IS_SRC(format->pad)) {
> - format->format.width = vsca->sink_fmt.width * sca_mult;
> - format->format.height = vsca->sink_fmt.height * sca_mult;
> + format->format.width = crop_rect->width * sca_mult;
> + format->format.height = crop_rect->height * sca_mult;
> }
>
> return 0;
> @@ -148,6 +200,7 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
> {
> struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> struct v4l2_mbus_framefmt *sink_fmt;
> + struct v4l2_rect *crop_rect;
>
> if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> /* Do not change the format while stream is on */
> @@ -155,8 +208,10 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
> return -EBUSY;
>
> sink_fmt = &vsca->sink_fmt;
> + crop_rect = &vsca->crop_rect;
> } else {
> sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> + crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> }
>
> /*
> @@ -165,8 +220,8 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
> */
> if (VIMC_IS_SRC(fmt->pad)) {
> fmt->format = *sink_fmt;
> - fmt->format.width = sink_fmt->width * sca_mult;
> - fmt->format.height = sink_fmt->height * sca_mult;
> + fmt->format.width = crop_rect->width * sca_mult;
> + fmt->format.height = crop_rect->height * sca_mult;
> } else {
> /* Set the new format in the sink pad */
> vimc_sca_adjust_sink_fmt(&fmt->format);
> @@ -184,6 +239,80 @@ static int vimc_sca_set_fmt(struct v4l2_subdev *sd,
> fmt->format.xfer_func, fmt->format.ycbcr_enc);
>
> *sink_fmt = fmt->format;
> +
> + /* Do the crop, but respect the current bounds */
> + vimc_sca_adjust_sink_crop(crop_rect, sink_fmt);
> + }
> +
> + return 0;
> +}
> +
> +static int vimc_sca_get_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_selection *sel)
> +{
> + struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt *sink_fmt;
> + struct v4l2_rect *crop_rect;
> +
> + if (VIMC_IS_SRC(sel->pad))
> + return -EINVAL;
> +
> + if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> + sink_fmt = &vsca->sink_fmt;
> + crop_rect = &vsca->crop_rect;
> + } else {
> + sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> + crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> + }
> +
> + switch (sel->target) {
> + case V4L2_SEL_TGT_CROP:
> + sel->r = *crop_rect;
> + break;
> + case V4L2_SEL_TGT_CROP_BOUNDS:
> + sel->r = vimc_sca_get_crop_bound_sink(sink_fmt);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int vimc_sca_set_selection(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_selection *sel)
> +{
> + struct vimc_sca_device *vsca = v4l2_get_subdevdata(sd);
> + struct v4l2_mbus_framefmt *sink_fmt;
> + struct v4l2_rect *crop_rect;
> + struct v4l2_rect sink_rect;
> +
> + if (VIMC_IS_SRC(sel->pad))
> + return -EINVAL;
> +
> + if (sel->which == V4L2_SUBDEV_FORMAT_ACTIVE) {
> + /* Do not change the format while stream is on */
> + if (vsca->src_frame)
> + return -EBUSY;
> +
> + crop_rect = &vsca->crop_rect;
> + sink_fmt = &vsca->sink_fmt;
> + } else {
> + crop_rect = v4l2_subdev_get_try_crop(sd, cfg, 0);
> + sink_fmt = v4l2_subdev_get_try_format(sd, cfg, 0);
> + }
> +
> + switch (sel->target) {
> + case V4L2_SEL_TGT_CROP:
> + /* Do the crop, but respect the current bounds */
> + sink_rect = vimc_sca_get_crop_bound_sink(sink_fmt);
> + vimc_sca_adjust_sink_crop(&sel->r, sink_fmt);
> + *crop_rect = sel->r;
drivers/media/platform/vimc/vimc-scaler.c: In function ‘vimc_sca_set_selection’:
drivers/media/platform/vimc/vimc-scaler.c:290:19: warning: variable ‘sink_rect’ set but not used [-Wunused-but-set-variable]
290 | struct v4l2_rect sink_rect;
| ^~~~~~~~~
Something is wrong here.
Regards,
Hans
> + break;
> + default:
> + return -EINVAL;
> }
>
> return 0;
> @@ -195,6 +324,8 @@ static const struct v4l2_subdev_pad_ops vimc_sca_pad_ops = {
> .enum_frame_size = vimc_sca_enum_frame_size,
> .get_fmt = vimc_sca_get_fmt,
> .set_fmt = vimc_sca_set_fmt,
> + .get_selection = vimc_sca_get_selection,
> + .set_selection = vimc_sca_set_selection,
> };
>
> static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
> @@ -213,11 +344,11 @@ static int vimc_sca_s_stream(struct v4l2_subdev *sd, int enable)
> vsca->bpp = vpix->bpp;
>
> /* Calculate the width in bytes of the src frame */
> - vsca->src_line_size = vsca->sink_fmt.width *
> + vsca->src_line_size = vsca->crop_rect.width *
> sca_mult * vsca->bpp;
>
> /* Calculate the frame size of the source pad */
> - frame_size = vsca->src_line_size * vsca->sink_fmt.height *
> + frame_size = vsca->src_line_size * vsca->crop_rect.height *
> sca_mult;
>
> /* Allocate the frame buffer. Use vmalloc to be able to
> @@ -259,9 +390,10 @@ static void vimc_sca_fill_pix(u8 *const ptr,
> }
>
> static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
> - const unsigned int lin, const unsigned int col,
> + unsigned int lin, unsigned int col,
> const u8 *const sink_frame)
> {
> + const struct v4l2_rect crop_rect = vsca->crop_rect;
> unsigned int i, j, index;
> const u8 *pixel;
>
> @@ -278,8 +410,10 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
> /* point to the place we are going to put the first pixel
> * in the scaled src frame
> */
> + lin -= crop_rect.top;
> + col -= crop_rect.left;
> index = VIMC_FRAME_INDEX(lin * sca_mult, col * sca_mult,
> - vsca->sink_fmt.width * sca_mult, vsca->bpp);
> + crop_rect.width * sca_mult, vsca->bpp);
>
> dev_dbg(vsca->ved.dev, "sca: %s: scale_pix src pos %dx%d, index %d\n",
> vsca->sd.name, lin * sca_mult, col * sca_mult, index);
> @@ -307,12 +441,13 @@ static void vimc_sca_scale_pix(const struct vimc_sca_device *const vsca,
> static void vimc_sca_fill_src_frame(const struct vimc_sca_device *const vsca,
> const u8 *const sink_frame)
> {
> + const struct v4l2_rect r = vsca->crop_rect;
> unsigned int i, j;
>
> /* Scale each pixel from the original sink frame */
> /* TODO: implement scale down, only scale up is supported for now */
> - for (i = 0; i < vsca->sink_fmt.height; i++)
> - for (j = 0; j < vsca->sink_fmt.width; j++)
> + for (i = r.top; i < r.top + r.height; i++)
> + for (j = r.left; j < r.left + r.width; j++)
> vimc_sca_scale_pix(vsca, i, j, sink_frame);
> }
>
> @@ -384,5 +519,8 @@ struct vimc_ent_device *vimc_sca_add(struct vimc_device *vimc,
> /* Initialize the frame format */
> vsca->sink_fmt = sink_fmt_default;
>
> + /* Initialize the crop selection */
> + vsca->crop_rect = crop_rect_default;
> +
> return &vsca->ved;
> }
>
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