Extend v4l2 selection API to support multiple selection areas, this way
sensors that support multiple readout areas can work with multiple areas
of insterest.
The struct v4l2_selection and v4l2_subdev_selection has been extented
with a new field rectangles. If it is value is different than zero the
pr array is used instead of the r field.
A new structure v4l2_ext_rect has been defined, containing 4 reserved
fields for future improvements, as suggested by Hans.
Two helper functiona are also added, to help the drivers that support
a single selection.
This Patch ONLY adds the modification to the core. Once it is agreed, a
new version including changes on the drivers that handle the selection
api will come.
struct v4l2_selection has the same size on 32 and 64 bits, therefore I
dont think that any change on v4l2-compat-ioctl32 is needed.
ricardo@neopili:/tmp$ gcc kk.c -m32
ricardo@neopili:/tmp$ ./a.out
Size of v4l2_selection=64
ricardo@neopili:/tmp$ gcc kk.c
ricardo@neopili:/tmp$ ./a.out
Size of v4l2_selection=64
This patch includes all the comments by Hans Verkuil.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@xxxxxxxxx>
---
drivers/media/v4l2-core/v4l2-common.c | 39 +++++++++++++++++++++++++++++++++++
drivers/media/v4l2-core/v4l2-ioctl.c | 37 ++++++++++++++++++++++++++++-----
include/media/v4l2-common.h | 4 ++++
include/uapi/linux/v4l2-subdev.h | 10 +++++++--
include/uapi/linux/videodev2.h | 21 +++++++++++++++----
5 files changed, 100 insertions(+), 11 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-core/v4l2-common.c
index a95e5e2..007ab32 100644
--- a/drivers/media/v4l2-core/v4l2-common.c
+++ b/drivers/media/v4l2-core/v4l2-common.c
@@ -886,3 +886,42 @@ void v4l2_get_timestamp(struct timeval *tv)
tv->tv_usec = ts.tv_nsec / NSEC_PER_USEC;
}
EXPORT_SYMBOL_GPL(v4l2_get_timestamp);
+
+int v4l2_selection_get_rect(struct v4l2_selection *s, struct v4l2_ext_rect *r)
+{
+ if (s->rectangles > 1)
+ return -EINVAL;
+ if (s->rectangles == 1) {
+ *r = s->pr[0];
+ return 0;
+ }
+ if (s->r.width < 0 || s->r.height < 0)
+ return -EINVAL;
+ r->left = s->r.left;
+ r->top = s->r.top;
+ r->width = s->r.width;
+ r->height = s->r.height;
+ memset(r->reserved, 0, sizeof(r->reserved));
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_selection_get_rect);
+
+int v4l2_selection_set_rect(struct v4l2_ext_rect *r, struct v4l2_selection *s)
+{
+ if (s->rectangles == 0) {
+ if (s->r.width > UINT_MAX || s->r.height > UINT_MAX)
+ return -EINVAL;
+ s->r.left = r->left;
+ s->r.top = r->top;
+ s->r.width = r->width;
+ s->r.height = r->height;
+ return 0;
+ }
+ if (s->rectangles > 1) {
+ s->pr[0] = *r;
+ s->rectangles = 1;
+ return 0;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_selection_set_rect);
diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
index 68e6b5e..29f7cf1 100644
--- a/drivers/media/v4l2-core/v4l2-ioctl.c
+++ b/drivers/media/v4l2-core/v4l2-ioctl.c
@@ -572,11 +572,22 @@ static void v4l_print_crop(const void *arg, bool write_only)
static void v4l_print_selection(const void *arg, bool write_only)
{
const struct v4l2_selection *p = arg;
+ int i;
- pr_cont("type=%s, target=%d, flags=0x%x, wxh=%dx%d, x,y=%d,%d\n",
- prt_names(p->type, v4l2_type_names),
- p->target, p->flags,
- p->r.width, p->r.height, p->r.left, p->r.top);
+ if (p->rectangles == 0)
+ pr_cont("type=%s, target=%d, flags=0x%x, wxh=%dx%d, x,y=%d,%d\n",
+ prt_names(p->type, v4l2_type_names),
+ p->target, p->flags,
+ p->r.width, p->r.height, p->r.left, p->r.top);
+ else{
+ pr_cont("type=%s, target=%d, flags=0x%x rectangles=%d\n",
+ prt_names(p->type, v4l2_type_names),
+ p->target, p->flags, p->rectangles);
+ for (i = 0; i < p->rectangles; i++)
+ pr_cont("rectangle %d: wxh=%dx%d, x,y=%d,%d\n",
+ i, p->r.width, p->r.height,
+ p->r.left, p->r.top);
+ }
}
static void v4l_print_jpegcompression(const void *arg, bool write_only)
@@ -1692,7 +1703,9 @@ static int v4l_cropcap(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
struct v4l2_cropcap *p = arg;
- struct v4l2_selection s = { .type = p->type };
+ struct v4l2_selection s = {
+ .type = p->type,
+ };
int ret;
if (ops->vidioc_cropcap)
@@ -2253,6 +2266,20 @@ static int check_array_args(unsigned int cmd, void *parg, size_t *array_size,
}
break;
}
+
+ case VIDIOC_G_SELECTION:
+ case VIDIOC_S_SELECTION: {
+ struct v4l2_selection *s = parg;
+
+ if (s->rectangles) {
+ *user_ptr = (void __user *)s->pr;
+ kernel_ptr = (void *)&s->pr;
+ array_size = sizeof(struct v4l2_ext_rect)
+ * s->rectangles;
+ ret = 1;
+ }
+ break;
+ }
}
return ret;
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h
index 015ff82..dc96861 100644
--- a/include/media/v4l2-common.h
+++ b/include/media/v4l2-common.h
@@ -216,4 +216,8 @@ struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
void v4l2_get_timestamp(struct timeval *tv);
+int v4l2_selection_get_rect(struct v4l2_selection *s, struct v4l2_ext_rect *r);
+
+int v4l2_selection_set_rect(struct v4l2_ext_rect *r, struct v4l2_selection *s);
+
#endif /* V4L2_COMMON_H_ */
diff --git a/include/uapi/linux/v4l2-subdev.h b/include/uapi/linux/v4l2-subdev.h
index a33c4da..c02a886 100644
--- a/include/uapi/linux/v4l2-subdev.h
+++ b/include/uapi/linux/v4l2-subdev.h
@@ -133,6 +133,8 @@ struct v4l2_subdev_frame_interval_enum {
* defined in v4l2-common.h; V4L2_SEL_TGT_* .
* @flags: constraint flags, defined in v4l2-common.h; V4L2_SEL_FLAG_*.
* @r: coordinates of the selection window
+ * @pr: array of rectangles containing the selection windows
+ * @rectangles: Number of rectangles in pr structure. If zero, r is used instead
* @reserved: for future use, set to zero for now
*
* Hardware may use multiple helper windows to process a video stream.
@@ -144,8 +146,12 @@ struct v4l2_subdev_selection {
__u32 pad;
__u32 target;
__u32 flags;
- struct v4l2_rect r;
- __u32 reserved[8];
+ union {
+ struct v4l2_rect r;
+ struct v4l2_ext_rect *pr;
+ };
+ __u32 rectangles;
+ __u32 reserved[7];
};
struct v4l2_subdev_edid {
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 95ef455..a4a7902 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -211,6 +211,14 @@ struct v4l2_rect {
__s32 height;
};
+struct v4l2_ext_rect {
+ __s32 left;
+ __s32 top;
+ __u32 width;
+ __u32 height;
+ __u32 reserved[4];
+};
+
struct v4l2_fract {
__u32 numerator;
__u32 denominator;
@@ -804,6 +812,8 @@ struct v4l2_crop {
* defined in v4l2-common.h; V4L2_SEL_TGT_* .
* @flags: constraints flags, defined in v4l2-common.h; V4L2_SEL_FLAG_*.
* @r: coordinates of selection window
+ * @pr: array of rectangles containing the selection windows
+ * @rectangles: Number of rectangles in pr structure. If zero, r is used instead
* @reserved: for future use, rounds structure size to 64 bytes, set to zero
*
* Hardware may use multiple helper windows to process a video stream.
@@ -814,10 +824,13 @@ struct v4l2_selection {
__u32 type;
__u32 target;
__u32 flags;
- struct v4l2_rect r;
- __u32 reserved[9];
-};
-
+ union {
+ struct v4l2_rect r;
+ struct v4l2_ext_rect *pr;
+ };
+ __u32 rectangles;
+ __u32 reserved[8];
+} __packed;
/*
* A N A L O G V I D E O S T A N D A R D
--
1.8.4.rc3
--
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