On 06/28/2013 02:27 PM, Hans Verkuil wrote:
From: Hans Verkuil<hans.verk...@cisco.com>
This patch adds core support for matrices: querying, getting and setting.
Two initial matrix types are defined for motion detection (defining regions
and thresholds).
Signed-off-by: Hans Verkuil<hans.verk...@cisco.com>
---
drivers/media/v4l2-core/v4l2-dev.c | 3 ++
drivers/media/v4l2-core/v4l2-ioctl.c | 23 ++++++++++++-
include/media/v4l2-ioctl.h | 8 +++++
include/uapi/linux/videodev2.h | 64 ++++++++++++++++++++++++++++++++++++
4 files changed, 97 insertions(+), 1 deletion(-)
[...]
diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index e0b74a4..7e4538e 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -271,6 +271,14 @@ struct v4l2_ioctl_ops {
int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
const struct v4l2_event_subscription
*sub);
+ /* Matrix ioctls */
+ int (*vidioc_query_matrix) (struct file *file, void *fh,
+ struct v4l2_query_matrix *qmatrix);
+ int (*vidioc_g_matrix) (struct file *file, void *fh,
+ struct v4l2_matrix *matrix);
+ int (*vidioc_s_matrix) (struct file *file, void *fh,
+ struct v4l2_matrix *matrix);
+
/* For other private ioctls */
long (*vidioc_default) (struct file *file, void *fh,
bool valid_prio, unsigned int cmd, void
*arg);
diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
index 95ef455..5cbe815 100644
--- a/include/uapi/linux/videodev2.h
+++ b/include/uapi/linux/videodev2.h
@@ -1838,6 +1838,64 @@ struct v4l2_create_buffers {
__u32 reserved[8];
};
+/* Define to which motion detection region each element belongs.
+ * Each element is a __u8. */
+#define V4L2_MATRIX_TYPE_MD_REGION (1)
+/* Define the motion detection threshold for each element.
+ * Each element is a __u16. */
+#define V4L2_MATRIX_TYPE_MD_THRESHOLD (2)
+
+/**
+ * struct v4l2_query_matrix - VIDIOC_QUERY_MATRIX argument
+ * @type: matrix type
+ * @ref: reference to some object (if any) owning the matrix
+ * @columns: number of columns in the matrix
+ * @rows: number of rows in the matrix
+ * @elem_min: minimum matrix element value
+ * @elem_max: maximum matrix element value
+ * @elem_size: size in bytes each matrix element
+ * @reserved: future extensions, applications and drivers must zero this.
+ */
+struct v4l2_query_matrix {
+ __u32 type;
+ union {
+ __u32 reserved[4];
+ } ref;
+ __u32 columns;
+ __u32 rows;
+ union {
+ __s64 val;
+ __u64 uval;
+ __u32 reserved[4];
+ } elem_min;
+ union {
+ __s64 val;
+ __u64 uval;
+ __u32 reserved[4];
+ } elem_max;
+ __u32 elem_size;
How about reordering it to something like:
struct {
union {
__s64 val;
__u64 uval;
__u32 reserved[4];
} min;
union {
__s64 val;
__u64 uval;
__u32 reserved[4];
} max;
__u32 size;
} element;
?
--
Regards,
Sylwester
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