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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>
This commit is contained in:
Hans Verkuil 2018-10-24 06:51:01 -04:00 committed by Mauro Carvalho Chehab
parent c2eb8effb2
commit 245ede423b
2 changed files with 35 additions and 1 deletions
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19
drivers/media/common/videobuf2/videobuf2-v4l2.c
View File

@ -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

17
include/media/videobuf2-v4l2.h
View File

@ -55,6 +55,23 @@ struct vb2_v4l2_buffer {
#define to_vb2_v4l2_buffer(vb) \
container_of(vb, struct vb2_v4l2_buffer, vb2_buf)
/**
* vb2_find_timestamp() - Find buffer with given timestamp in the queue
*
* @q: pointer to &struct vb2_queue with videobuf2 queue.
* @timestamp: the timestamp 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 timestamp 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 @timestamp, or
* -1 if no buffer with @timestamp was found.
*/
int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp,
unsigned int start_idx);
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
/**