ipa: ipu3: Initialize CameraSensorHelper at IPU3 init stage

In order for the CameraSensorHelper to be instantiated, we need to find
its factory using the camera sensor model name stored in
IPASettings::sensorModel. As we don't need to do it at each configure
call (the sensor is not changing in-between), implement the init call in
IPAIPU3 to do that.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/ipu3/ipu3.cpp

@@ -24,6 +24,7 @@
 
 #include "ipu3_agc.h"
 #include "ipu3_awb.h"
+#include "libipa/camera_sensor_helper.h"
 
 static constexpr uint32_t kMaxCellWidthPerSet = 160;
 static constexpr uint32_t kMaxCellHeightPerSet = 56;
@@ -37,10 +38,7 @@ namespace ipa::ipu3 {
 class IPAIPU3 : public IPAIPU3Interface
 {
 public:
-	int init([[maybe_unused]] const IPASettings &settings) override
+	int init(const IPASettings &settings) override;
-	{
-		return 0;
-	}
 	int start() override;
 	void stop() override {}
 
@@ -79,6 +77,8 @@ private:
 	std::unique_ptr<IPU3Awb> awbAlgo_;
 	/* Interface to the AEC/AGC algorithm */
 	std::unique_ptr<IPU3Agc> agcAlgo_;
+	/* Interface to the Camera Helper */
+	std::unique_ptr<CameraSensorHelper> camHelper_;
 
 	/* Local parameter storage */
 	struct ipu3_uapi_params params_;
@@ -86,6 +86,17 @@ private:
 	struct ipu3_uapi_grid_config bdsGrid_;
 };
 
+int IPAIPU3::init(const IPASettings &settings)
+{
+	camHelper_ = CameraSensorHelperFactory::create(settings.sensorModel);
+	if (camHelper_ == nullptr) {
+		LOG(IPAIPU3, Error) << "Failed to create camera sensor helper for " << settings.sensorModel;
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
 int IPAIPU3::start()
 {
 	setControls(0);
@@ -281,7 +292,10 @@ void IPAIPU3::parseStatistics(unsigned int frame,
 {
 	ControlList ctrls(controls::controls);
 
-	agcAlgo_->process(stats, exposure_, gain_);
+	double gain = camHelper_->gain(gain_);
+	agcAlgo_->process(stats, exposure_, gain);
+	gain_ = camHelper_->gainCode(gain);
+
 	awbAlgo_->calculateWBGains(stats);
 
 	if (agcAlgo_->updateControls())

src/ipa/ipu3/ipu3_agc.cpp

@@ -145,7 +145,7 @@ void IPU3Agc::filterExposure()
 	LOG(IPU3Agc, Debug) << "After filtering, total_exposure " << prevExposure_;
 }
 
-void IPU3Agc::lockExposureGain(uint32_t &exposure, uint32_t &gain)
+void IPU3Agc::lockExposureGain(uint32_t &exposure, double &gain)
 {
 	updateControls_ = false;
 
@@ -193,7 +193,7 @@ void IPU3Agc::lockExposureGain(uint32_t &exposure, uint32_t &gain)
 	lastFrame_ = frameCount_;
 }
 
-void IPU3Agc::process(const ipu3_uapi_stats_3a *stats, uint32_t &exposure, uint32_t &gain)
+void IPU3Agc::process(const ipu3_uapi_stats_3a *stats, uint32_t &exposure, double &gain)
 {
 	processBrightness(stats);
 	lockExposureGain(exposure, gain);

src/ipa/ipu3/ipu3_agc.h

@@ -33,7 +33,7 @@ public:
 	~IPU3Agc() = default;
 
 	void initialise(struct ipu3_uapi_grid_config &bdsGrid, const IPACameraSensorInfo &sensorInfo);
-	void process(const ipu3_uapi_stats_3a *stats, uint32_t &exposure, uint32_t &gain);
+	void process(const ipu3_uapi_stats_3a *stats, uint32_t &exposure, double &gain);
 	bool converged() { return converged_; }
 	bool updateControls() { return updateControls_; }
 	/* \todo Use a metadata exchange between IPAs */
@@ -42,7 +42,7 @@ public:
 private:
 	void processBrightness(const ipu3_uapi_stats_3a *stats);
 	void filterExposure();
-	void lockExposureGain(uint32_t &exposure, uint32_t &gain);
+	void lockExposureGain(uint32_t &exposure, double &gain);
 
 	struct ipu3_uapi_grid_config aeGrid_;