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-rw-r--r--src/ipa/libipa/camera_sensor_helper.cpp318
-rw-r--r--src/ipa/libipa/camera_sensor_helper.h87
-rw-r--r--src/ipa/libipa/meson.build2
3 files changed, 407 insertions, 0 deletions
diff --git a/src/ipa/libipa/camera_sensor_helper.cpp b/src/ipa/libipa/camera_sensor_helper.cpp
new file mode 100644
index 00000000..23335ed6
--- /dev/null
+++ b/src/ipa/libipa/camera_sensor_helper.cpp
@@ -0,0 +1,318 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera_sensor_helper.cpp - Helper class that performs sensor-specific parameter computations
+ */
+#include "camera_sensor_helper.h"
+
+#include "libcamera/base/log.h"
+
+/**
+ * \file camera_sensor_helper.h
+ * \brief Helper class that performs sensor-specific parameter computations
+ *
+ * Computation of sensor configuration parameters is a sensor specific
+ * operation. Each CameraHelper derived class computes the value of
+ * configuration parameters, for example the analogue gain value, using
+ * sensor-specific functions and constants.
+ *
+ * Every subclass of CameraSensorHelper shall be registered with libipa using
+ * the REGISTER_CAMERA_SENSOR_HELPER() macro.
+ */
+
+namespace libcamera {
+
+LOG_DEFINE_CATEGORY(CameraSensorHelper)
+
+namespace ipa {
+
+/**
+ * \class CameraSensorHelper
+ * \brief Base class for computing sensor tuning parameters using sensor-specific constants
+ *
+ * Instances derived from CameraSensorHelper class are sensor specific.
+ * Each supported sensor will have an associated base class defined.
+ */
+
+/**
+ * \brief Construct a CameraSensorHelper instance
+ *
+ * CameraSensorHelper derived class instances shall never be constructed manually
+ * but always through the CameraSensorHelperFactory::create() method.
+ */
+
+/**
+ * \brief Compute gain code from the analogue gain absolute value
+ * \param[in] gain The real gain to pass
+ *
+ * This function aims to abstract the calculation of the gain letting the IPA
+ * use the real gain for its estimations.
+ *
+ * The parameters come from the MIPI Alliance Camera Specification for
+ * Camera Command Set (CCS).
+ *
+ * \return The gain code to pass to V4l2
+ */
+uint32_t CameraSensorHelper::gainCode(double gain) const
+{
+ ASSERT((analogueGainConstants_.m0 == 0) || (analogueGainConstants_.m1 == 0));
+ ASSERT(analogueGainConstants_.type == AnalogueGainLinear);
+
+ return (analogueGainConstants_.c0 - analogueGainConstants_.c1 * gain) /
+ (analogueGainConstants_.m1 * gain - analogueGainConstants_.m0);
+}
+
+/**
+ * \brief Compute the real gain from the V4l2 subdev control gain code
+ * \param[in] gainCode The V4l2 subdev control gain
+ *
+ * This function aims to abstract the calculation of the gain letting the IPA
+ * use the real gain for its estimations. It is the counterpart of the function
+ * CameraSensorHelper::gainCode.
+ *
+ * The parameters come from the MIPI Alliance Camera Specification for
+ * Camera Command Set (CCS).
+ *
+ * \return The real gain
+ */
+double CameraSensorHelper::gain(uint32_t gainCode) const
+{
+ ASSERT((analogueGainConstants_.m0 == 0) || (analogueGainConstants_.m1 == 0));
+ ASSERT(analogueGainConstants_.type == AnalogueGainLinear);
+
+ return (analogueGainConstants_.m0 * static_cast<double>(gainCode) + analogueGainConstants_.c0) /
+ (analogueGainConstants_.m1 * static_cast<double>(gainCode) + analogueGainConstants_.c1);
+}
+
+/**
+ * \enum CameraSensorHelper::AnalogueGainType
+ * \brief The gain calculation modes as defined by the MIPI CCS
+ *
+ * Describes the image sensor analogue gain capabilities.
+ * Two modes are possible, depending on the sensor: Global and Alternate.
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainLinear
+ * \brief Gain is computed using linear gain estimation
+ *
+ * The relationship between the integer gain parameter and the resulting gain
+ * multiplier is given by the following equation:
+ *
+ * \f$gain=\frac{m0x+c0}{m1x+c1}\f$
+ *
+ * Where 'x' is the gain control parameter, and m0, m1, c0 and c1 are
+ * image-sensor-specific constants of the sensor.
+ * These constants are static parameters, and for any given image sensor either
+ * m0 or m1 shall be zero.
+ *
+ * The full Gain equation therefore reduces to either:
+ *
+ * \f$gain=\frac{c0}{m1x+c1}\f$ or \f$\frac{m0x+c0}{c1}\f$
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainExponential
+ * \brief Gain is computed using exponential gain estimation (introduced in CCS v1.1)
+ *
+ * Starting with CCS v1.1, Alternate Global Analogue Gain is also available.
+ * If the image sensor supports it, then the global analogue gain can be controlled
+ * by linear and exponential gain formula:
+ *
+ * \f$gain = analogLinearGainGlobal * 2^{analogExponentialGainGlobal}\f$
+ * \todo not implemented in libipa
+ */
+
+/**
+ * \struct CameraSensorHelper::AnalogueGainConstants
+ * \brief Analogue gain constants used for gain calculation
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainConstants::type
+ * \brief Analogue gain calculation mode
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainConstants::m0
+ * \brief Constant used in the analogue Gain coding/decoding
+ *
+ * \note Either m0 or m1 shall be zero.
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainConstants::c0
+ * \brief Constant used in the analogue gain coding/decoding
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainConstants::m1
+ * \brief Constant used in the analogue gain coding/decoding
+ *
+ * \note Either m0 or m1 shall be zero.
+ */
+
+/**
+ * \var CameraSensorHelper::AnalogueGainConstants::c1
+ * \brief Constant used in the analogue gain coding/decoding
+ */
+
+/**
+ * \var CameraSensorHelper::analogueGainConstants_
+ * \brief The analogue gain parameters used for calculation
+ *
+ * The analogue gain is calculated through a formula, and its parameters are
+ * sensor specific. Use this variable to store the values at init time.
+ */
+
+/**
+ * \class CameraSensorHelperFactory
+ * \brief Registration of CameraSensorHelperFactory classes and creation of instances
+ *
+ * To facilitate discovery and instantiation of CameraSensorHelper classes, the
+ * CameraSensorHelperFactory class maintains a registry of camera sensor helper
+ * sub-classes. Each CameraSensorHelper subclass shall register itself using the
+ * REGISTER_CAMERA_SENSOR_HELPER() macro, which will create a corresponding
+ * instance of a CameraSensorHelperFactory subclass and register it with the
+ * static list of factories.
+ */
+
+/**
+ * \brief Construct a camera sensor helper factory
+ * \param[in] name Name of the camera sensor helper class
+ *
+ * Creating an instance of the factory registers it with the global list of
+ * factories, accessible through the factories() function.
+ *
+ * The factory \a name is used for debug purpose and shall be unique.
+ */
+CameraSensorHelperFactory::CameraSensorHelperFactory(const std::string name)
+ : name_(name)
+{
+ registerType(this);
+}
+
+/**
+ * \brief Create an instance of the CameraSensorHelper corresponding to the factory
+ * \param[in] name Name of the factory
+ *
+ * \return A unique pointer to a new instance of the CameraSensorHelper subclass
+ * corresponding to the factory
+ */
+std::unique_ptr<CameraSensorHelper> CameraSensorHelperFactory::create(const std::string &name)
+{
+ std::vector<CameraSensorHelperFactory *> &factories =
+ CameraSensorHelperFactory::factories();
+
+ for (CameraSensorHelperFactory *factory : factories) {
+ if (name != factory->name_)
+ continue;
+
+ CameraSensorHelper *helper = factory->createInstance();
+ return std::unique_ptr<CameraSensorHelper>(helper);
+ }
+
+ return nullptr;
+}
+
+/**
+ * \brief Add a camera sensor helper class to the registry
+ * \param[in] factory Factory to use to construct the camera sensor helper
+ *
+ * The caller is responsible to guarantee the uniqueness of the camera sensor helper
+ * name.
+ */
+void CameraSensorHelperFactory::registerType(CameraSensorHelperFactory *factory)
+{
+ std::vector<CameraSensorHelperFactory *> &factories = CameraSensorHelperFactory::factories();
+
+ factories.push_back(factory);
+}
+
+/**
+ * \brief Retrieve the list of all camera sensor helper factories
+ *
+ * The static factories map is defined inside the function to ensures it gets
+ * initialized on first use, without any dependency on link order.
+ *
+ * \return The list of camera sensor helper factories
+ */
+std::vector<CameraSensorHelperFactory *> &CameraSensorHelperFactory::factories()
+{
+ static std::vector<CameraSensorHelperFactory *> factories;
+ return factories;
+}
+
+/**
+ * \fn CameraSensorHelperFactory::createInstance()
+ * \brief Create an instance of the CameraSensorHelper corresponding to the factory
+ *
+ * This virtual function is implemented by the REGISTER_CAMERA_SENSOR_HELPER()
+ * macro. It creates a camera sensor helper instance associated with the camera
+ * sensor model.
+ *
+ * \return A pointer to a newly constructed instance of the CameraSensorHelper
+ * subclass corresponding to the factory
+ */
+
+/**
+ * \var CameraSensorHelperFactory::name_
+ * \brief The name of the factory
+ */
+
+/**
+ * \def REGISTER_CAMERA_SENSOR_HELPER
+ * \brief Register a camera sensor helper with the camera sensor helper factory
+ * \param[in] name Sensor model name used to register the class
+ * \param[in] helper Class name of CameraSensorHelper derived class to register
+ *
+ * Register a CameraSensorHelper subclass with the factory and make it available to
+ * try and match devices.
+ */
+
+/**
+ * \class CameraSensorHelperImx219
+ * \brief Create and give helpers for the imx219 sensor
+ */
+class CameraSensorHelperImx219 : public CameraSensorHelper
+{
+public:
+ CameraSensorHelperImx219()
+ {
+ analogueGainConstants_ = { AnalogueGainLinear, 0, -1, 256, 256 };
+ }
+};
+REGISTER_CAMERA_SENSOR_HELPER("imx219", CameraSensorHelperImx219)
+
+/**
+ * \class CameraSensorHelperOv5670
+ * \brief Create and give helpers for the ov5670 sensor
+ */
+class CameraSensorHelperOv5670 : public CameraSensorHelper
+{
+public:
+ CameraSensorHelperOv5670()
+ {
+ analogueGainConstants_ = { AnalogueGainLinear, 1, 0, 0, 256 };
+ }
+};
+REGISTER_CAMERA_SENSOR_HELPER("ov5670", CameraSensorHelperOv5670)
+
+/**
+ * \class CameraSensorHelperOv5693
+ * \brief Create and give helpers for the ov5693 sensor
+ */
+class CameraSensorHelperOv5693 : public CameraSensorHelper
+{
+public:
+ CameraSensorHelperOv5693()
+ {
+ analogueGainConstants_ = { AnalogueGainLinear, 1, 0, 0, 16 };
+ }
+};
+REGISTER_CAMERA_SENSOR_HELPER("ov5693", CameraSensorHelperOv5693)
+
+} /* namespace ipa */
+
+} /* namespace libcamera */
diff --git a/src/ipa/libipa/camera_sensor_helper.h b/src/ipa/libipa/camera_sensor_helper.h
new file mode 100644
index 00000000..1c47e8d5
--- /dev/null
+++ b/src/ipa/libipa/camera_sensor_helper.h
@@ -0,0 +1,87 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021, Google Inc.
+ *
+ * camera_sensor_helper.h - Helper class that performs sensor-specific parameter computations
+ */
+#ifndef __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__
+#define __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__
+
+#include <stdint.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include <libcamera/base/class.h>
+
+namespace libcamera {
+
+namespace ipa {
+
+class CameraSensorHelper
+{
+public:
+ CameraSensorHelper() = default;
+ virtual ~CameraSensorHelper() = default;
+
+ virtual uint32_t gainCode(double gain) const;
+ virtual double gain(uint32_t gainCode) const;
+
+protected:
+ enum AnalogueGainType {
+ AnalogueGainLinear = 0,
+ AnalogueGainExponential = 2,
+ };
+
+ struct AnalogueGainConstants {
+ AnalogueGainType type;
+ int16_t m0;
+ int16_t c0;
+ int16_t m1;
+ int16_t c1;
+ };
+
+ AnalogueGainConstants analogueGainConstants_;
+
+private:
+ LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelper)
+};
+
+class CameraSensorHelperFactory
+{
+public:
+ CameraSensorHelperFactory(const std::string name);
+ virtual ~CameraSensorHelperFactory() = default;
+
+ static std::unique_ptr<CameraSensorHelper> create(const std::string &name);
+
+ static void registerType(CameraSensorHelperFactory *factory);
+ static std::vector<CameraSensorHelperFactory *> &factories();
+
+protected:
+ LIBCAMERA_DISABLE_COPY_AND_MOVE(CameraSensorHelperFactory)
+ virtual CameraSensorHelper *createInstance() = 0;
+
+ std::string name_;
+};
+
+#define REGISTER_CAMERA_SENSOR_HELPER(name, helper) \
+class helper##Factory final : public CameraSensorHelperFactory \
+{ \
+public: \
+ helper##Factory() : CameraSensorHelperFactory(name) {} \
+ \
+private: \
+ CameraSensorHelper *createInstance() \
+ { \
+ return new helper(); \
+ } \
+}; \
+static helper##Factory global_##helper##Factory;
+
+} /* namespace ipa */
+
+} /* namespace libcamera */
+
+#endif /* __LIBCAMERA_IPA_LIBIPA_CAMERA_SENSOR_HELPER_H__ */
diff --git a/src/ipa/libipa/meson.build b/src/ipa/libipa/meson.build
index ca541a5a..3fda7c00 100644
--- a/src/ipa/libipa/meson.build
+++ b/src/ipa/libipa/meson.build
@@ -2,11 +2,13 @@
libipa_headers = files([
'algorithm.h',
+ 'camera_sensor_helper.h',
'histogram.h'
])
libipa_sources = files([
'algorithm.cpp',
+ 'camera_sensor_helper.cpp',
'histogram.cpp'
])