[libcamera-devel] [PATCH v2 5/6] ipu3: Run AIQ for the first frame to avoid blanking

[Han-Lin Chen]

The start() function set the first exposure time and analog gain to maximum.
In result, the first frame might be over bright and the user may see a
bright blank when changing the camera in application. Run AIQ to get an
initial exposure time and analog gain in start() to smooth the AE
process.

Signed-off-by: Han-Lin Chen <hanlinchen at chromium.org>
---
 ipu3.cpp | 45 ++++++++++++++++++++++++++-------------------
 1 file changed, 26 insertions(+), 19 deletions(-)

diff --git a/ipu3.cpp b/ipu3.cpp
index c2dc754..2232e07 100644
--- a/ipu3.cpp
+++ b/ipu3.cpp
@@ -56,6 +56,7 @@ private:
 			    const ControlInfoMap &sensorControls,
 			    ControlInfoMap *ipaControls);
 	void processControls(unsigned int frame, const ControlList &metadata);
+	void runAiq(unsigned int frame);
 	void fillParams(unsigned int frame, ipu3_uapi_params *params);
 	void parseStatistics(unsigned int frame,
 			     int64_t frameTimestamp,
@@ -221,6 +222,7 @@ int IPAIPU3::init(const IPASettings &settings,
 
 int IPAIPU3::start()
 {
+	runAiq(0);
 	setControls(0);
 
 	return 0;
@@ -370,29 +372,11 @@ void IPAIPU3::processControls([[maybe_unused]] unsigned int frame,
 	/* \todo Start processing for 'frame' based on 'controls'. */
 }
 
-void IPAIPU3::fillParams(unsigned int frame, ipu3_uapi_params *params)
+void IPAIPU3::runAiq(unsigned int frame)
 {
-	/* Prepare parameters buffer. */
-	memset(params, 0, sizeof(*params));
-
-	/*
-	* Call into the AIQ object, and set up the library with any requested
-	* controls or settings from the incoming request.
-	*
-	* (statistics are fed into the library as a separate event
-	*  when available)
-	*
-	* - Run algorithms
-	*
-	* - Fill params buffer with the results of the algorithms.
-	*/
-
 	/* Run algorithms into/using this context structure */
 	aiq_.run2a(frame, aiqInputParams_, results_, lensPosition_, lensMovementStartTime_);
 
-	aic_.updateRuntimeParams(results_);
-	aic_.run(params);
-
 	exposure_ = results_.ae()->exposures[0].sensor_exposure->coarse_integration_time;
 	gain_ = results_.ae()->exposures[0].sensor_exposure->analog_gain_code_global;
 
@@ -410,6 +394,29 @@ void IPAIPU3::fillParams(unsigned int frame, ipu3_uapi_params *params)
 	lensPosition_ = results_.af()->next_lens_position;
 
 	resultsHistory_.Push(results_);
+}
+
+void IPAIPU3::fillParams(unsigned int frame, ipu3_uapi_params *params)
+{
+	/* Prepare parameters buffer. */
+	memset(params, 0, sizeof(*params));
+
+	/*
+	* Call into the AIQ object, and set up the library with any requested
+	* controls or settings from the incoming request.
+	*
+	* (statistics are fed into the library as a separate event
+	*  when available)
+	*
+	* - Run algorithms
+	*
+	* - Fill params buffer with the results of the algorithms.
+	*/
+
+	runAiq(frame);
+
+	aic_.updateRuntimeParams(results_);
+	aic_.run(params);
 
 	setControls(frame);
 
-- 
2.33.1.1089.g2158813163f-goog