From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Add support for tags to vb2. Besides just storing and setting
the tag this patch also adds the vb2_find_tag() function that
can be used to find a buffer with the given tag.
This function will only look at DEQUEUED and DONE buffers, i.e.
buffers that are already processed.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
.../media/common/videobuf2/videobuf2-v4l2.c | 43 ++++++++++++++++---
include/media/videobuf2-v4l2.h | 21 ++++++++-
2 files changed, 58 insertions(+), 6 deletions(-)
diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index a17033ab2c22..36781d2367a9 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -50,7 +50,8 @@ module_param(debug, int, 0644);
V4L2_BUF_FLAG_TIMESTAMP_MASK)
/* Output buffer flags that should be passed on to the driver */
#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
- V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
+ V4L2_BUF_FLAG_KEYFRAME | \
+ V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TAG)
/*
* __verify_planes_array() - verify that the planes array passed in struct
@@ -144,8 +145,11 @@ static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
*/
if (q->copy_timestamp)
vb->timestamp = timeval_to_ns(&b->timestamp);
- vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
- if (b->flags & V4L2_BUF_FLAG_TIMECODE)
+ vbuf->flags |= b->flags &
+ (V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TAG);
+ if (b->flags & V4L2_BUF_FLAG_TAG)
+ vbuf->tag = v4l2_buffer_get_tag(b);
+ else if (b->flags & V4L2_BUF_FLAG_TIMECODE)
vbuf->timecode = b->timecode;
}
};
@@ -195,6 +199,7 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b
}
vbuf->sequence = 0;
vbuf->request_fd = -1;
+ vbuf->tag = 0;
if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
switch (b->memory) {
@@ -314,13 +319,19 @@ static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b
}
if (V4L2_TYPE_IS_OUTPUT(b->type)) {
+ if ((b->flags & V4L2_BUF_FLAG_TIMECODE) &&
+ (b->flags & V4L2_BUF_FLAG_TAG)) {
+ dprintk(1, "buffer flag TIMECODE cannot be combined with flag TAG\n");
+ return -EINVAL;
+ }
+
/*
* For output buffers mask out the timecode flag:
* this will be handled later in vb2_qbuf().
* The 'field' is valid metadata for this output buffer
* and so that needs to be copied here.
*/
- vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
+ vbuf->flags &= ~(V4L2_BUF_FLAG_TIMECODE | V4L2_BUF_FLAG_TAG);
vbuf->field = b->field;
} else {
/* Zero any output buffer flags as this is a capture buffer */
@@ -461,7 +472,10 @@ static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
b->flags = vbuf->flags;
b->field = vbuf->field;
b->timestamp = ns_to_timeval(vb->timestamp);
- b->timecode = vbuf->timecode;
+ if (b->flags & V4L2_BUF_FLAG_TAG)
+ v4l2_buffer_set_tag(b, vbuf->tag);
+ else
+ b->timecode = vbuf->timecode;
b->sequence = vbuf->sequence;
b->reserved2 = 0;
b->request_fd = 0;
@@ -587,6 +601,25 @@ static const struct vb2_buf_ops v4l2_buf_ops = {
.copy_timestamp = __copy_timestamp,
};
+int vb2_find_tag(const struct vb2_queue *q, u64 tag,
+ unsigned int start_idx)
+{
+ unsigned int i;
+
+ for (i = start_idx; i < q->num_buffers; i++) {
+ struct vb2_buffer *vb = q->bufs[i];
+ struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+
+ if ((vb->state == VB2_BUF_STATE_DEQUEUED ||
+ vb->state == VB2_BUF_STATE_DONE) &&
+ (vbuf->flags & V4L2_BUF_FLAG_TAG) &&
+ vbuf->tag == tag)
+ return i;
+ }
+ return -1;
+}
+EXPORT_SYMBOL_GPL(vb2_find_tag);
+
/*
* vb2_querybuf() - query video buffer information
* @q: videobuf queue
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index 727855463838..60ff7348a2b6 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -31,8 +31,9 @@
* @field: field order of the image in the buffer, as defined by
* &enum v4l2_field.
* @timecode: frame timecode.
+ * @tag: user specified buffer tag value.
* @sequence: sequence count of this frame.
- * @request_fd: the request_fd associated with this buffer
+ * @request_fd: the request_fd associated with this buffer.
* @planes: plane information (userptr/fd, length, bytesused, data_offset).
*
* Should contain enough information to be able to cover all the fields
@@ -44,6 +45,7 @@ struct vb2_v4l2_buffer {
__u32 flags;
__u32 field;
struct v4l2_timecode timecode;
+ __u64 tag;
__u32 sequence;
__s32 request_fd;
struct vb2_plane planes[VB2_MAX_PLANES];
@@ -55,6 +57,23 @@ struct vb2_v4l2_buffer {
#define to_vb2_v4l2_buffer(vb) \
container_of(vb, struct vb2_v4l2_buffer, vb2_buf)
+/**
+ * vb2_find_tag() - Find buffer with given tag in the queue
+ *
+ * @q: pointer to &struct vb2_queue with videobuf2 queue.
+ * @tag: the tag to find. Only buffers in state DEQUEUED or DONE
+ * are considered.
+ * @start_idx: the start index (usually 0) in the buffer array to start
+ * searching from. Note that there may be multiple buffers
+ * with the same tag value, so you can restart the search
+ * by setting @start_idx to the previously found index + 1.
+ *
+ * Returns the buffer index of the buffer with the given @tag, or
+ * -1 if no buffer with @tag was found.
+ */
+int vb2_find_tag(const struct vb2_queue *q, u64 tag,
+ unsigned int start_idx);
+
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
/**
--
2.19.1
