media: vb2: add vb2_find_timestamp()

Use v4l2_timeval_to_ns instead of timeval_to_ns to ensure that
both kernelspace and userspace will use the same conversion
function.

Next add a new vb2_find_timestamp() function to find buffers
with a specific timestamp.

This function will only look at DEQUEUED and DONE buffers, i.e.
buffers that are already processed.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1 files changed, 18 insertions, 1 deletions

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 3a0ca2f9854f..75ea90e795d8 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -143,7 +143,7 @@ static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
                  * and the timecode field and flag if needed.
                  */
                 if (q->copy_timestamp)
-                        vb->timestamp = timeval_to_ns(&b->timestamp);
+                        vb->timestamp = v4l2_timeval_to_ns(&b->timestamp);
                 vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
                 if (b->flags & V4L2_BUF_FLAG_TIMECODE)
                         vbuf->timecode = b->timecode;
@@ -589,6 +589,23 @@ static const struct vb2_buf_ops v4l2_buf_ops = {
         .copy_timestamp         = __copy_timestamp,
 };
 
+int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp,
+                       unsigned int start_idx)
+{
+        unsigned int i;
+
+        for (i = start_idx; i < q->num_buffers; i++) {
+                struct vb2_buffer *vb = q->bufs[i];
+
+                if ((vb->state == VB2_BUF_STATE_DEQUEUED ||
+                     vb->state == VB2_BUF_STATE_DONE) &&
+                    vb->timestamp == timestamp)
+                        return i;
+        }
+        return -1;
+}
+EXPORT_SYMBOL_GPL(vb2_find_timestamp);
+
 /*
  * vb2_querybuf() - query video buffer information
  * @q:          videobuf queue