[PATCH 4/5] ipa: rkisp1: blc: Report sensor black levels in metadata

[Stefan Klug]

For the tuning process it is necessary to know the sensor black levels.
Add them to the metadata.

Additionally enable raw support for this algorithm and add it to
uncalibrated.yaml, so that black levels get reported when capturing
tuning images.

Signed-off-by: Stefan Klug <stefan.klug at ideasonboard.com>
---
 src/ipa/rkisp1/algorithms/blc.cpp     | 19 +++++++++++++++++++
 src/ipa/rkisp1/algorithms/blc.h       |  5 ++++-
 src/ipa/rkisp1/data/uncalibrated.yaml |  1 +
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/src/ipa/rkisp1/algorithms/blc.cpp b/src/ipa/rkisp1/algorithms/blc.cpp
index 0c39c3b47da5..a9f76b87d15a 100644
--- a/src/ipa/rkisp1/algorithms/blc.cpp
+++ b/src/ipa/rkisp1/algorithms/blc.cpp
@@ -9,6 +9,8 @@
 
 #include <libcamera/base/log.h>
 
+#include <libcamera/control_ids.h>
+
 #include "libcamera/internal/yaml_parser.h"
 
 /**
@@ -38,6 +40,7 @@ LOG_DEFINE_CATEGORY(RkISP1Blc)
 BlackLevelCorrection::BlackLevelCorrection()
 	: tuningParameters_(false)
 {
+	supportsRaw_ = true;
 }
 
 /**
@@ -107,6 +110,22 @@ void BlackLevelCorrection::prepare([[maybe_unused]] IPAContext &context,
 	params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_BLS;
 }
 
+/**
+ * \copydoc libcamera::ipa::Algorithm::process
+ */
+void BlackLevelCorrection::process([[maybe_unused]] IPAContext &context,
+				   [[maybe_unused]] const uint32_t frame,
+				   [[maybe_unused]] IPAFrameContext &frameContext,
+				   [[maybe_unused]] const rkisp1_stat_buffer *stats,
+				   [[maybe_unused]] ControlList &metadata)
+{
+	metadata.set(controls::SensorBlackLevels,
+		     { static_cast<int32_t>(blackLevelRed_),
+		       static_cast<int32_t>(blackLevelGreenR_),
+		       static_cast<int32_t>(blackLevelGreenB_),
+		       static_cast<int32_t>(blackLevelBlue_) });
+}
+
 REGISTER_IPA_ALGORITHM(BlackLevelCorrection, "BlackLevelCorrection")
 
 } /* namespace ipa::rkisp1::algorithms */
diff --git a/src/ipa/rkisp1/algorithms/blc.h b/src/ipa/rkisp1/algorithms/blc.h
index 460ebcc15739..4ecac233f88b 100644
--- a/src/ipa/rkisp1/algorithms/blc.h
+++ b/src/ipa/rkisp1/algorithms/blc.h
@@ -23,7 +23,10 @@ public:
 	void prepare(IPAContext &context, const uint32_t frame,
 		     IPAFrameContext &frameContext,
 		     rkisp1_params_cfg *params) override;
-
+	void process(IPAContext &context, const uint32_t frame,
+		     IPAFrameContext &frameContext,
+		     const rkisp1_stat_buffer *stats,
+		     ControlList &metadata) override;
 private:
 	bool tuningParameters_;
 	int16_t blackLevelRed_;
diff --git a/src/ipa/rkisp1/data/uncalibrated.yaml b/src/ipa/rkisp1/data/uncalibrated.yaml
index a7bbd8d84263..609012967e02 100644
--- a/src/ipa/rkisp1/data/uncalibrated.yaml
+++ b/src/ipa/rkisp1/data/uncalibrated.yaml
@@ -5,4 +5,5 @@ version: 1
 algorithms:
   - Agc:
   - Awb:
+  - BlackLevelCorrection:
 ...
-- 
2.43.0