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libcamera: v4l2_videodevice: Improve readability

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The handling for the sequence number validation within
V4L2VideoDevice::dequeueBuffer makes use of a std::optional, which can
be used as a boolean in conditional statements. This has the impact in
this use case that it can be mis-read to be interpretting the value for
firstFrame_ which is assigned as the buf.sequence.

Remove this potential for confusion by making it clear that the first
frame handling is only performed when firstFrame_ does not have a value
assigned.

Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
[Kieran: Rework commit message]
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Stefan Klug 2024-08-08 18:30:41 +01:00 • committed by Kieran Bingham
parent 75fc944738
commit 33a49ce4a2
1 changed files with 1 additions and 1 deletions
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2
src/libcamera/v4l2_videodevice.cpp
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@ -1840,7 +1840,7 @@ FrameBuffer *V4L2VideoDevice::dequeueBuffer()
* Detect kernel drivers which do not reset the sequence number to zero
* on stream start.
*/
if (!firstFrame_) {
if (!firstFrame_.has_value()) {
if (buf.sequence)
LOG(V4L2, Info)
<< "Zero sequence expected for first frame (got "