libcamera: delayed_controls: Fix off-by-one error in get()

There was an off-by-one error in DelayedControls::get() when picking
controls from the queue to return back to the pipeline handler.
This is only noticeable as small oscillations in brightness when closely
viewing frame while AGC is running. The old StaggeredCtrl did not show
this error as the startup queuing mechanism has changed in
DelayedControls.

Fix this by indexing to the correct position in the queue.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reported-by: David Plowman <david.plowman@raspberrypi.com>
Fixes: 3d4b7b005911 ("libcamera: delayed_controls: Add helper for controls that apply with a delay")
Tested-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Tested-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/libcamera/delayed_controls.cpp b/src/libcamera/delayed_controls.cpp
index 2f953a06..a3917fd9 100644
--- a/src/libcamera/delayed_controls.cpp
+++ b/src/libcamera/delayed_controls.cpp
@@ -184,7 +184,7 @@ bool DelayedControls::push(const ControlList &controls)
  */
 ControlList DelayedControls::get(uint32_t sequence)
 {
-	uint32_t adjustedSeq = sequence - firstSequence_ + 1;
+	uint32_t adjustedSeq = sequence - firstSequence_;
 	unsigned int index = std::max<int>(0, adjustedSeq - maxDelay_);
 
 	ControlList out(device_->controls());