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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* ipu3.cpp - IPU3 Image Processing Algorithms
*/
#include <algorithm>
#include <array>
#include <cmath>
#include <limits>
#include <map>
#include <memory>
#include <stdint.h>
#include <utility>
#include <vector>
#include <linux/intel-ipu3.h>
#include <linux/v4l2-controls.h>
#include <libcamera/base/log.h>
#include <libcamera/control_ids.h>
#include <libcamera/framebuffer.h>
#include <libcamera/ipa/ipa_interface.h>
#include <libcamera/ipa/ipa_module_info.h>
#include <libcamera/ipa/ipu3_ipa_interface.h>
#include <libcamera/request.h>
#include "libcamera/internal/mapped_framebuffer.h"
#include "algorithms/agc.h"
#include "algorithms/algorithm.h"
#include "algorithms/awb.h"
#include "algorithms/tone_mapping.h"
#include "libipa/camera_sensor_helper.h"
/**
* \file ipa_context.h
* \brief Context and state information shared between the algorithms
*/
/**
* \struct IPASessionConfiguration
* \brief Session configuration for the IPA module
*
* The session configuration contains all IPA configuration parameters that
* remain constant during the capture session, from IPA module start to stop.
* It is typically set during the configure() operation of the IPA module, but
* may also be updated in the start() operation.
*/
/**
* \struct IPAFrameContext
* \brief Per-frame context for algorithms
*
* The frame context stores data specific to a single frame processed by the
* IPA. Each frame processed by the IPA has a context associated with it,
* accessible through the IPAContext structure.
*
* \todo Detail how to access contexts for a particular frame
*
* Each of the fields in the frame context belongs to either a specific
* algorithm, or to the top-level IPA module. A field may be read by any
* algorithm, but should only be written by its owner.
*/
/**
* \struct IPAContext
* \brief Global IPA context data shared between all algorithms
*
* \var IPAContext::configuration
* \brief The IPA session configuration, immutable during the session
*
* \var IPAContext::frameContext
* \brief The frame context for the frame being processed
*
* \todo While the frame context is supposed to be per-frame, this
* single frame context stores data related to both the current frame
* and the previous frames, with fields being updated as the algorithms
* are run. This needs to be turned into real per-frame data storage.
*/
/**
* \struct IPASessionConfiguration::grid
* \brief Grid configuration of the IPA
*
* \var IPASessionConfiguration::grid::bdsGrid
* \brief Bayer Down Scaler grid plane config used by the kernel
*
* \var IPASessionConfiguration::grid::bdsOutputSize
* \brief BDS output size configured by the pipeline handler
*/
/**
* \struct IPAFrameContext::agc
* \brief Context for the Automatic Gain Control algorithm
*
* The exposure and gain determined are expected to be applied to the sensor
* at the earliest opportunity.
*
* \var IPAFrameContext::agc::exposure
* \brief Exposure time expressed as a number of lines
*
* \var IPAFrameContext::agc::gain
* \brief Analogue gain multiplier
*
* The gain should be adapted to the sensor specific gain code before applying.
*/
/**
* \struct IPAFrameContext::awb
* \brief Context for the Automatic White Balance algorithm
*
* \struct IPAFrameContext::awb::gains
* \brief White balance gains
*
* \var IPAFrameContext::awb::gains::red
* \brief White balance gain for R channel
*
* \var IPAFrameContext::awb::gains::green
* \brief White balance gain for G channel
*
* \var IPAFrameContext::awb::gains::blue
* \brief White balance gain for B channel
*/
/**
* \struct IPAFrameContext::toneMapping
* \brief Context for ToneMapping and Gamma control
*
* \var IPAFrameContext::toneMapping::gammaCorrection
* \brief Per-pixel tone mapping implemented as a LUT
*
* The LUT structure is defined by the IPU3 kernel interface. See
* <linux/intel-ipu3.h> struct ipu3_uapi_gamma_corr_lut for further details.
*/
static constexpr uint32_t kMaxCellWidthPerSet = 160;
static constexpr uint32_t kMaxCellHeightPerSet = 56;
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAIPU3)
namespace ipa::ipu3 {
class IPAIPU3 : public IPAIPU3Interface
{
public:
int init(const IPASettings &settings,
const IPACameraSensorInfo &sensorInfo,
const ControlInfoMap &sensorControls,
ControlInfoMap *ipaControls) override;
int start() override;
void stop() override {}
int configure(const IPAConfigInfo &configInfo) override;
void mapBuffers(const std::vector<IPABuffer> &buffers) override;
void unmapBuffers(const std::vector<unsigned int> &ids) override;
void processEvent(const IPU3Event &event) override;
private:
void processControls(unsigned int frame, const ControlList &controls);
void fillParams(unsigned int frame, ipu3_uapi_params *params);
void parseStatistics(unsigned int frame,
int64_t frameTimestamp,
const ipu3_uapi_stats_3a *stats);
void setControls(unsigned int frame);
void calculateBdsGrid(const Size &bdsOutputSize);
std::map<unsigned int, MappedFrameBuffer> buffers_;
ControlInfoMap ctrls_;
IPACameraSensorInfo sensorInfo_;
/* Camera sensor controls. */
uint32_t defVBlank_;
uint32_t exposure_;
uint32_t minExposure_;
uint32_t maxExposure_;
uint32_t gain_;
uint32_t minGain_;
uint32_t maxGain_;
/* Interface to the Camera Helper */
std::unique_ptr<CameraSensorHelper> camHelper_;
/* Maintain the algorithms used by the IPA */
std::list<std::unique_ptr<ipa::ipu3::Algorithm>> algorithms_;
/* Local parameter storage */
struct IPAContext context_;
};
/**
* Initialize the IPA module and its controls.
*
* This function receives the camera sensor information from the pipeline
* handler, computes the limits of the controls it handles and returns
* them in the \a ipaControls output parameter.
*/
int IPAIPU3::init(const IPASettings &settings,
const IPACameraSensorInfo &sensorInfo,
const ControlInfoMap &sensorControls,
ControlInfoMap *ipaControls)
{
camHelper_ = CameraSensorHelperFactory::create(settings.sensorModel);
if (camHelper_ == nullptr) {
LOG(IPAIPU3, Error)
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