[PATCH v6 2/5] pipeline: simple: Connect/disconnect frameStart signal at start/stop time

[Stanislaw Gruszka]

The frameStart signal from the frame start emitter is connected in the
configure() function, and is never disconnected. This means that each
time the camera is configured a new connection is made, causing the
DelayedControls::applyControls() to be called multiple times. Fix it by
connecting and disconnecting the signal when starting and stopping the
camera.

Co-developed-by: Hans de Goede <hdegoede at redhat.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Co-developed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
---
 src/libcamera/pipeline/simple/simple.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/libcamera/pipeline/simple/simple.cpp b/src/libcamera/pipeline/simple/simple.cpp
index 6e039bf3..8345a771 100644
--- a/src/libcamera/pipeline/simple/simple.cpp
+++ b/src/libcamera/pipeline/simple/simple.cpp
@@ -1285,8 +1285,6 @@ int SimplePipelineHandler::configure(Camera *camera, CameraConfiguration *c)
 	data->delayedCtrls_ =
 		std::make_unique<DelayedControls>(data->sensor_->device(),
 						  params);
-	data->video_->frameStart.connect(data->delayedCtrls_.get(),
-					 &DelayedControls::applyControls);
 
 	StreamConfiguration inputCfg;
 	inputCfg.pixelFormat = pipeConfig->captureFormat;
@@ -1354,6 +1352,9 @@ int SimplePipelineHandler::start(Camera *camera, [[maybe_unused]] const ControlL
 
 	video->bufferReady.connect(data, &SimpleCameraData::imageBufferReady);
 
+	data->video_->frameStart.connect(data->delayedCtrls_.get(),
+					 &DelayedControls::applyControls);
+
 	ret = video->streamOn();
 	if (ret < 0) {
 		stop(camera);
@@ -1386,6 +1387,9 @@ void SimplePipelineHandler::stopDevice(Camera *camera)
 	SimpleCameraData *data = cameraData(camera);
 	V4L2VideoDevice *video = data->video_;
 
+	data->video_->frameStart.disconnect(data->delayedCtrls_.get(),
+					    &DelayedControls::applyControls);
+
 	if (data->useConversion_) {
 		if (data->converter_)
 			data->converter_->stop();
-- 
2.43.0