[v3,13/21] ipa: rppx1: blc: Add

28351 diff mbox series

diff --git a/src/ipa/rppx1/algorithms/blc.cpp b/src/ipa/rppx1/algorithms/blc.cpp
new file mode 100644
index 0000000000..a56b834fb6
--- /dev/null
+++ b/src/ipa/rppx1/algorithms/blc.cpp
@@ -0,0 +1,111 @@ 
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2026, Ideas On Board
+ *
+ * RPP-X1 Black Level Correction control
+ */
+
+#include "blc.h"
+
+#include <libcamera/base/log.h>
+
+#include <libcamera/control_ids.h>
+
+#include "libcamera/internal/value_node.h"
+
+/**
+ * \file blc.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rppx1::algorithms {
+
+LOG_DEFINE_CATEGORY(RppX1Blc)
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::init
+ */
+int BlackLevelCorrection::init(IPAContext &context, [[maybe_unused]] const ValueNode &tuningData)
+{
+	auto blackLevel = context.camHelper->blackLevel();
+	if (!blackLevel) {
+		LOG(RppX1Blc, Error)
+			<< "No black levels provided by camera sensor helper";
+		return -ENOTSUP;
+	}
+
+	blackLevelRed_ = *blackLevel;
+	blackLevelGreenR_ = *blackLevel;
+	blackLevelGreenB_ = *blackLevel;
+	blackLevelBlue_ = *blackLevel;
+
+	LOG(RppX1Blc, Debug)
+		<< "Black levels: red " << blackLevelRed_
+		<< ", green (red) " << blackLevelGreenR_
+		<< ", green (blue) " << blackLevelGreenB_
+		<< ", blue " << blackLevelBlue_;
+
+	return 0;
+}
+
+int BlackLevelCorrection::configure([[maybe_unused]] IPAContext &context,
+				    [[maybe_unused]] const IPACameraSensorInfo &configInfo)
+{
+	return 0;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void BlackLevelCorrection::prepare([[maybe_unused]] IPAContext &context,
+				   const uint32_t frame,
+				   [[maybe_unused]] IPAFrameContext &frameContext,
+				   RppX1Params *params)
+{
+	if (frame > 0)
+		return;
+
+	auto config = params->block<BlockType::BlsPre1>();
+	config.setEnabled(true);
+
+	config->mode = RPPX1_BLS_MODE_FIXED;
+	config->en_windows = RPPX1_BLS_WIN_EN_OFF;
+
+	/*
+	 * RPP-X1: the rppx1 specifies fixed BLS values per-color component
+	 * matching on the input port cropping configuration.
+	 * We have the same BLS value for all channels, so this is not relevant
+	 * for now, but should probably be handled properly.
+	 *
+	 * Black level values are 16 bits, scale to the RPP-X1 PRE1 pipe
+	 * 24-bit-domain.
+	 */
+
+	config->fixed.a = static_cast<int32_t>(blackLevelRed_) << 8;
+	config->fixed.b = static_cast<int32_t>(blackLevelGreenR_) << 8;
+	config->fixed.c = static_cast<int32_t>(blackLevelGreenB_) << 8;
+	config->fixed.d = static_cast<int32_t>(blackLevelBlue_) << 8;
+}
+
+/**
+ * \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 RppX1Stats *stats,
+				   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::rppx1::algorithms */
+
+} /* namespace libcamera */
diff --git a/src/ipa/rppx1/algorithms/blc.h b/src/ipa/rppx1/algorithms/blc.h
new file mode 100644
index 0000000000..3752166d78
--- /dev/null
+++ b/src/ipa/rppx1/algorithms/blc.h
@@ -0,0 +1,41 @@ 
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2026, Ideas On Board
+ *
+ * RPP-X1 Black Level Correction control
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+#include "algorithm.h"
+
+namespace libcamera {
+
+namespace ipa::rppx1::algorithms {
+
+class BlackLevelCorrection : public Algorithm
+{
+public:
+	int init(IPAContext &context, const ValueNode &tuningData) override;
+	int configure(IPAContext &context,
+		      const IPACameraSensorInfo &configInfo) override;
+	void prepare(IPAContext &context, const uint32_t frame,
+		     IPAFrameContext &frameContext,
+		     RppX1Params *params) override;
+	void process(IPAContext &context, const uint32_t frame,
+		     IPAFrameContext &frameContext,
+		     const RppX1Stats *stats,
+		     ControlList &metadata) override;
+
+private:
+	int16_t blackLevelRed_;
+	int16_t blackLevelGreenR_;
+	int16_t blackLevelGreenB_;
+	int16_t blackLevelBlue_;
+};
+
+} /* namespace ipa::rppx1::algorithms */
+
+} /* namespace libcamera */
diff --git a/src/ipa/rppx1/algorithms/meson.build b/src/ipa/rppx1/algorithms/meson.build
index 5fed9e9d50..165f0ce054 100644
--- a/src/ipa/rppx1/algorithms/meson.build
+++ b/src/ipa/rppx1/algorithms/meson.build
@@ -1,4 +1,5 @@ 
 # SPDX-License-Identifier: CC0-1.0
 
 rppx1_ipa_algorithms = files([
+    'blc.cpp',
 ])
diff --git a/src/ipa/rppx1/params.h b/src/ipa/rppx1/params.h
index 315c8a9785..05db309914 100644
--- a/src/ipa/rppx1/params.h
+++ b/src/ipa/rppx1/params.h
@@ -16,6 +16,7 @@  namespace libcamera {
 namespace ipa::rppx1 {
 
 enum class BlockType : uint16_t {
+	BlsPre1,
 };
 
 namespace details {
@@ -32,6 +33,8 @@  struct block_type {
 			RPPX1_PARAMS_BLOCK_TYPE_##id;			\
 	};
 
+RPPX1_DEFINE_BLOCK_TYPE(BlsPre1, bls, BLS_PRE1)
+
 struct params_traits {
 	using id_type = BlockType;