ipa: simple: Report exposure in metadata

Report exposure and gain in metadata.

This is more complicated than it could be expected because the exposure
value should be in microseconds but it's handled using V4L2_CID_EXPOSURE
control, which doesn't specify the unit, see
https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/control.html.
So the unit conversion is done in the way rkisp1 IPA uses.

This requires getting and passing IPACameraSensorInfo around.  To avoid
naming confusion and to improve consistency with rkisp1 IPA,
sensorCtrlInfoMap parameter is renamed to sensorControls.

Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Milan Zamazal <mzamazal@redhat.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

include/libcamera/ipa/soft.mojom

@@ -16,7 +16,8 @@ interface IPASoftInterface {
 	init(libcamera.IPASettings settings,
 	     libcamera.SharedFD fdStats,
 	     libcamera.SharedFD fdParams,
-	     libcamera.ControlInfoMap sensorCtrlInfoMap)
+	     libcamera.IPACameraSensorInfo sensorInfo,
+	     libcamera.ControlInfoMap sensorControls)
 		=> (int32 ret, libcamera.ControlInfoMap ipaControls, bool ccmEnabled);
 	start() => (int32 ret);
 	stop();

src/ipa/simple/algorithms/agc.cpp

@@ -11,6 +11,8 @@
 
 #include <libcamera/base/log.h>
 
+#include "control_ids.h"
+
 namespace libcamera {
 
 LOG_DEFINE_CATEGORY(IPASoftExposure)
@@ -97,10 +99,15 @@ void Agc::updateExposure(IPAContext &context, IPAFrameContext &frameContext, dou
 
 void Agc::process(IPAContext &context,
 		  [[maybe_unused]] const uint32_t frame,
-		  [[maybe_unused]] IPAFrameContext &frameContext,
+		  IPAFrameContext &frameContext,
 		  const SwIspStats *stats,
-		  [[maybe_unused]] ControlList &metadata)
+		  ControlList &metadata)
 {
+	utils::Duration exposureTime =
+		context.configuration.agc.lineDuration * frameContext.sensor.exposure;
+	metadata.set(controls::ExposureTime, exposureTime.get<std::micro>());
+	metadata.set(controls::AnalogueGain, frameContext.sensor.gain);
+
 	/*
 	 * Calculate Mean Sample Value (MSV) according to formula from:
 	 * https://www.araa.asn.au/acra/acra2007/papers/paper84final.pdf

src/ipa/simple/ipa_context.h

@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: LGPL-2.1-or-later */
 /*
- * Copyright (C) 2024 Red Hat, Inc.
+ * Copyright (C) 2024-2025 Red Hat, Inc.
  *
  * Simple pipeline IPA Context
  */
@@ -18,6 +18,8 @@
 
 #include <libipa/fc_queue.h>
 
+#include "core_ipa_interface.h"
+
 namespace libcamera {
 
 namespace ipa::soft {
@@ -27,6 +29,7 @@ struct IPASessionConfiguration {
 	struct {
 		int32_t exposureMin, exposureMax;
 		double againMin, againMax, againMinStep;
+		utils::Duration lineDuration;
 	} agc;
 	struct {
 		std::optional<uint8_t> level;
@@ -83,6 +86,7 @@ struct IPAContext {
 	{
 	}
 
+	IPACameraSensorInfo sensorInfo;
 	IPASessionConfiguration configuration;
 	IPAActiveState activeState;
 	FCQueue<IPAFrameContext> frameContexts;

src/ipa/simple/soft_simple.cpp

@@ -5,6 +5,7 @@
  * Simple Software Image Processing Algorithm module
  */
 
+#include <chrono>
 #include <stdint.h>
 #include <sys/mman.h>
 
@@ -32,6 +33,8 @@
 namespace libcamera {
 LOG_DEFINE_CATEGORY(IPASoft)
 
+using namespace std::literals::chrono_literals;
+
 namespace ipa::soft {
 
 /* Maximum number of frame contexts to be held */
@@ -50,7 +53,8 @@ public:
 	int init(const IPASettings &settings,
 		 const SharedFD &fdStats,
 		 const SharedFD &fdParams,
-		 const ControlInfoMap &sensorInfoMap,
+		 const IPACameraSensorInfo &sensorInfo,
+		 const ControlInfoMap &sensorControls,
 		 ControlInfoMap *ipaControls,
 		 bool *ccmEnabled) override;
 	int configure(const IPAConfigInfo &configInfo) override;
@@ -89,7 +93,8 @@ IPASoftSimple::~IPASoftSimple()
 int IPASoftSimple::init(const IPASettings &settings,
 			const SharedFD &fdStats,
 			const SharedFD &fdParams,
-			const ControlInfoMap &sensorInfoMap,
+			const IPACameraSensorInfo &sensorInfo,
+			const ControlInfoMap &sensorControls,
 			ControlInfoMap *ipaControls,
 			bool *ccmEnabled)
 {
@@ -100,6 +105,8 @@ int IPASoftSimple::init(const IPASettings &settings,
 			<< settings.sensorModel;
 	}
 
+	context_.sensorInfo = sensorInfo;
+
 	/* Load the tuning data file */
 	File file(settings.configurationFile);
 	if (!file.open(File::OpenModeFlag::ReadOnly)) {
@@ -173,12 +180,12 @@ int IPASoftSimple::init(const IPASettings &settings,
 	 * Don't save the min and max control values yet, as e.g. the limits
 	 * for V4L2_CID_EXPOSURE depend on the configured sensor resolution.
 	 */
-	if (sensorInfoMap.find(V4L2_CID_EXPOSURE) == sensorInfoMap.end()) {
+	if (sensorControls.find(V4L2_CID_EXPOSURE) == sensorControls.end()) {
 		LOG(IPASoft, Error) << "Don't have exposure control";
 		return -EINVAL;
 	}
 
-	if (sensorInfoMap.find(V4L2_CID_ANALOGUE_GAIN) == sensorInfoMap.end()) {
+	if (sensorControls.find(V4L2_CID_ANALOGUE_GAIN) == sensorControls.end()) {
 		LOG(IPASoft, Error) << "Don't have gain control";
 		return -EINVAL;
 	}
@@ -198,6 +205,8 @@ int IPASoftSimple::configure(const IPAConfigInfo &configInfo)
 	context_.activeState = {};
 	context_.frameContexts.clear();
 
+	context_.configuration.agc.lineDuration =
+		context_.sensorInfo.minLineLength * 1.0s / context_.sensorInfo.pixelRate;
 	context_.configuration.agc.exposureMin = exposureInfo.min().get<int32_t>();
 	context_.configuration.agc.exposureMax = exposureInfo.max().get<int32_t>();
 	if (!context_.configuration.agc.exposureMin) {

src/libcamera/software_isp/software_isp.cpp

@@ -133,12 +133,20 @@ SoftwareIsp::SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor,
 	std::string ipaTuningFile =
 		ipa_->configurationFile(sensor->model() + ".yaml", "uncalibrated.yaml");
 
-	int ret = ipa_->init(IPASettings{ ipaTuningFile, sensor->model() },
+	IPACameraSensorInfo sensorInfo{};
-			     debayer_->getStatsFD(),
+	int ret = sensor->sensorInfo(&sensorInfo);
-			     sharedParams_.fd(),
+	if (ret) {
-			     sensor->controls(),
+		LOG(SoftwareIsp, Error) << "Camera sensor information not available";
-			     ipaControls,
+		return;
-			     &ccmEnabled_);
+	}
+
+	ret = ipa_->init(IPASettings{ ipaTuningFile, sensor->model() },
+			 debayer_->getStatsFD(),
+			 sharedParams_.fd(),
+			 sensorInfo,
+			 sensor->controls(),
+			 ipaControls,
+			 &ccmEnabled_);
 	if (ret) {
 		LOG(SoftwareIsp, Error) << "IPA init failed";
 		debayer_.reset();