ipa: ipu3: Fill AGC and AWB metadata in algorithms

Fill the frame metadata in the AGC and AWB algorithm's prepare()
function. This removes the need to fill metadata manually in the IPA
module's processStatsBuffer() function.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/ipu3/algorithms/agc.cpp

@@ -14,6 +14,7 @@
 #include <libcamera/base/log.h>
 #include <libcamera/base/utils.h>
 
+#include <libcamera/control_ids.h>
 #include <libcamera/ipa/core_ipa_interface.h>
 
 #include "libipa/histogram.h"
@@ -328,7 +329,7 @@ double Agc::estimateLuminance(IPAActiveState &activeState,
 void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 		  IPAFrameContext &frameContext,
 		  const ipu3_uapi_stats_3a *stats,
-		  [[maybe_unused]] ControlList &metadata)
+		  ControlList &metadata)
 {
 	/*
 	 * Estimate the gain needed to have the proportion of pixels in a given
@@ -365,6 +366,19 @@ void Agc::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 
 	computeExposure(context, frameContext, yGain, iqMeanGain);
 	frameCount_++;
+
+	utils::Duration exposureTime = context.configuration.sensor.lineDuration
+				     * frameContext.sensor.exposure;
+	metadata.set(controls::AnalogueGain, frameContext.sensor.gain);
+	metadata.set(controls::ExposureTime, exposureTime.get<std::micro>());
+
+	/* \todo Use VBlank value calculated from each frame exposure. */
+	uint32_t vTotal = context.configuration.sensor.size.height
+			+ context.configuration.sensor.defVBlank;
+	utils::Duration frameDuration = context.configuration.sensor.lineDuration
+				      * vTotal;
+	metadata.set(controls::FrameDuration, frameDuration.get<std::micro>());
+
 }
 
 REGISTER_IPA_ALGORITHM(Agc, "Agc")

src/ipa/ipu3/algorithms/awb.cpp

@@ -11,6 +11,8 @@
 
 #include <libcamera/base/log.h>
 
+#include <libcamera/control_ids.h>
+
 /**
  * \file awb.h
  */
@@ -403,6 +405,14 @@ void Awb::process(IPAContext &context, [[maybe_unused]] const uint32_t frame,
 	context.activeState.awb.gains.green = asyncResults_.greenGain;
 	context.activeState.awb.gains.red = asyncResults_.redGain;
 	context.activeState.awb.temperatureK = asyncResults_.temperatureK;
+
+	metadata.set(controls::AwbEnable, true);
+	metadata.set(controls::ColourGains, {
+			static_cast<float>(context.activeState.awb.gains.red),
+			static_cast<float>(context.activeState.awb.gains.blue)
+		});
+	metadata.set(controls::ColourTemperature,
+		     context.activeState.awb.temperatureK);
 }
 
 constexpr uint16_t Awb::threshold(float value)

src/ipa/ipu3/ipa_context.cpp

@@ -111,6 +111,9 @@ namespace libcamera::ipa::ipu3 {
  *
  * \var IPASessionConfiguration::sensor.defVBlank
  * \brief The default vblank value of the sensor
+ *
+ * \var IPASessionConfiguration::sensor.size
+ * \brief Sensor output resolution
  */
 
 /**

src/ipa/ipu3/ipa_context.h

@@ -41,6 +41,7 @@ struct IPASessionConfiguration {
 	struct {
 		int32_t defVBlank;
 		utils::Duration lineDuration;
+		Size size;
 	} sensor;
 };
 

src/ipa/ipu3/ipu3.cpp

@@ -502,6 +502,7 @@ int IPAIPU3::configure(const IPAConfigInfo &configInfo,
 	/* Initialise the sensor configuration. */
 	context_.configuration.sensor.lineDuration = sensorInfo_.minLineLength
 						   * 1.0s / sensorInfo_.pixelRate;
+	context_.configuration.sensor.size = sensorInfo_.outputSize;
 
 	/*
 	 * Compute the sensor V4L2 controls to be used by the algorithms and
@@ -628,8 +629,6 @@ void IPAIPU3::processStatsBuffer(const uint32_t frame,
 	frameContext.sensor.exposure = sensorControls.get(V4L2_CID_EXPOSURE).get<int32_t>();
 	frameContext.sensor.gain = camHelper_->gain(sensorControls.get(V4L2_CID_ANALOGUE_GAIN).get<int32_t>());
 
-	double lineDuration = context_.configuration.sensor.lineDuration.get<std::micro>();
-	int32_t vBlank = context_.configuration.sensor.defVBlank;
 	ControlList metadata(controls::controls);
 
 	for (auto const &algo : algorithms())
@@ -637,16 +636,6 @@ void IPAIPU3::processStatsBuffer(const uint32_t frame,
 
 	setControls(frame);
 
-	/* \todo Use VBlank value calculated from each frame exposure. */
-	int64_t frameDuration = (vBlank + sensorInfo_.outputSize.height) * lineDuration;
-	metadata.set(controls::FrameDuration, frameDuration);
-
-	metadata.set(controls::AnalogueGain, frameContext.sensor.gain);
-
-	metadata.set(controls::ColourTemperature, context_.activeState.awb.temperatureK);
-
-	metadata.set(controls::ExposureTime, frameContext.sensor.exposure * lineDuration);
-
 	/*
 	 * \todo The Metadata provides a path to getting extended data
 	 * out to the application. Further data such as a simplifed Histogram