libcamera: software_isp: Add contrast control

This patch introduces support for applying runtime controls to software
ISP.  It enables the contrast control as the first control that can be
used.

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

include/libcamera/internal/software_isp/software_isp.h

@@ -46,7 +46,8 @@ LOG_DECLARE_CATEGORY(SoftwareIsp)
 class SoftwareIsp
 {
 public:
-	SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor);
+	SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor,
+		    ControlInfoMap *ipaControls);
 	~SoftwareIsp();
 
 	int loadConfiguration([[maybe_unused]] const std::string &filename) { return 0; }

include/libcamera/ipa/soft.mojom

@@ -17,7 +17,7 @@ interface IPASoftInterface {
 	     libcamera.SharedFD fdStats,
 	     libcamera.SharedFD fdParams,
 	     libcamera.ControlInfoMap sensorCtrlInfoMap)
-		=> (int32 ret);
+		=> (int32 ret, libcamera.ControlInfoMap ipaControls);
 	start() => (int32 ret);
 	stop();
 	configure(IPAConfigInfo configInfo)

src/ipa/simple/algorithms/lut.cpp

@@ -24,6 +24,13 @@ LOG_DEFINE_CATEGORY(IPASoftLut)
 
 namespace ipa::soft::algorithms {
 
+int Lut::init(IPAContext &context,
+	      [[maybe_unused]] const YamlObject &tuningData)
+{
+	context.ctrlMap[&controls::Contrast] = ControlInfo(0.0f, 2.0f, 1.0f);
+	return 0;
+}
+
 int Lut::configure(IPAContext &context,
 		   [[maybe_unused]] const IPAConfigInfo &configInfo)
 {

src/ipa/simple/algorithms/lut.h

@@ -19,6 +19,7 @@ public:
 	Lut() = default;
 	~Lut() = default;
 
+	int init(IPAContext &context, const YamlObject &tuningData) override;
 	int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
 	void queueRequest(typename Module::Context &context,
 			  const uint32_t frame,

src/ipa/simple/ipa_context.h

@@ -69,6 +69,7 @@ struct IPAContext {
 	IPASessionConfiguration configuration;
 	IPAActiveState activeState;
 	FCQueue<IPAFrameContext> frameContexts;
+	ControlInfoMap::Map ctrlMap;
 };
 
 } /* namespace ipa::soft */

src/ipa/simple/soft_simple.cpp

@@ -50,7 +50,8 @@ public:
 	int init(const IPASettings &settings,
 		 const SharedFD &fdStats,
 		 const SharedFD &fdParams,
-		 const ControlInfoMap &sensorInfoMap) override;
+		 const ControlInfoMap &sensorInfoMap,
+		 ControlInfoMap *ipaControls) override;
 	int configure(const IPAConfigInfo &configInfo) override;
 
 	int start() override;
@@ -87,7 +88,8 @@ IPASoftSimple::~IPASoftSimple()
 int IPASoftSimple::init(const IPASettings &settings,
 			const SharedFD &fdStats,
 			const SharedFD &fdParams,
-			const ControlInfoMap &sensorInfoMap)
+			const ControlInfoMap &sensorInfoMap,
+			ControlInfoMap *ipaControls)
 {
 	camHelper_ = CameraSensorHelperFactoryBase::create(settings.sensorModel);
 	if (!camHelper_) {
@@ -158,6 +160,9 @@ int IPASoftSimple::init(const IPASettings &settings,
 		stats_ = static_cast<SwIspStats *>(mem);
 	}
 
+	ControlInfoMap::Map ctrlMap = context_.ctrlMap;
+	*ipaControls = ControlInfoMap(std::move(ctrlMap), controls::controls);
+
 	/*
 	 * Check if the sensor driver supports the controls required by the
 	 * Soft IPA.

src/libcamera/pipeline/simple/simple.cpp

@@ -531,7 +531,7 @@ int SimpleCameraData::init()
 	 * Instantiate Soft ISP if this is enabled for the given driver and no converter is used.
 	 */
 	if (!converter_ && pipe->swIspEnabled()) {
-		swIsp_ = std::make_unique<SoftwareIsp>(pipe, sensor_.get());
+		swIsp_ = std::make_unique<SoftwareIsp>(pipe, sensor_.get(), &controlInfo_);
 		if (!swIsp_->isValid()) {
 			LOG(SimplePipeline, Warning)
 				<< "Failed to create software ISP, disabling software debayering";

src/libcamera/software_isp/software_isp.cpp

@@ -13,6 +13,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <libcamera/controls.h>
 #include <libcamera/formats.h>
 #include <libcamera/stream.h>
 
@@ -60,9 +61,11 @@ LOG_DEFINE_CATEGORY(SoftwareIsp)
  * \brief Constructs SoftwareIsp object
  * \param[in] pipe The pipeline handler in use
  * \param[in] sensor Pointer to the CameraSensor instance owned by the pipeline
+ * \param[out] ipaControls The IPA controls to update
  * handler
  */
-SoftwareIsp::SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor)
+SoftwareIsp::SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor,
+			 ControlInfoMap *ipaControls)
 	: dmaHeap_(DmaBufAllocator::DmaBufAllocatorFlag::CmaHeap |
 		   DmaBufAllocator::DmaBufAllocatorFlag::SystemHeap |
 		   DmaBufAllocator::DmaBufAllocatorFlag::UDmaBuf)
@@ -124,7 +127,8 @@ SoftwareIsp::SoftwareIsp(PipelineHandler *pipe, const CameraSensor *sensor)
 	int ret = ipa_->init(IPASettings{ ipaTuningFile, sensor->model() },
 			     debayer_->getStatsFD(),
 			     sharedParams_.fd(),
-			     sensor->controls());
+			     sensor->controls(),
+			     ipaControls);
 	if (ret) {
 		LOG(SoftwareIsp, Error) << "IPA init failed";
 		debayer_.reset();