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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Google Inc.
*
* ipa_context.cpp - IPU3 IPA Context
*/
#include "ipa_context.h"
/**
* \file ipa_context.h
* \brief Context and state information shared between the algorithms
*/
namespace libcamera::ipa::ipu3 {
/**
* \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 IPAActiveState
* \brief The active state of the IPA algorithms
*
* The IPA is fed with the statistics generated from the latest frame captured
* by the hardware. The statistics are then processed by the IPA algorithms to
* compute ISP parameters required for the next frame capture. The current state
* of the algorithms is reflected through the IPAActiveState to store the values
* most recently computed by the IPA algorithms.
*/
/**
* \struct IPAFrameContext
* \brief Context for a frame
*
* 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.
*
* Fields in the frame context should reflect values and controls
* associated with the specific frame as requested by the application, and
* as configured by the hardware. Fields can be read by algorithms to
* determine if they should update any specific action for this frame, and
* finally to update the metadata control lists when the frame is fully
* completed.
*/
/**
* \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
*
* \var IPAContext::activeState
* \brief The current state of IPA algorithms
*
* \todo The frame context needs to be turned into real per-frame data storage.
*/
/**
* \var 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
*
* \var IPASessionConfiguration::grid.stride
* \brief Number of cells on one line including the ImgU padding
*/
/**
* \var IPASessionConfiguration::af
* \brief AF grid configuration of the IPA
*
* \var IPASessionConfiguration::af.afGrid
* \brief AF scene grid configuration.
*/
/**
* \var IPAActiveState::af
* \brief Context for the Automatic Focus algorithm
*
* \struct IPAActiveState::af
* \var IPAActiveState::af.focus
* \brief Current position of the lens
*
* \var IPAActiveState::af.maxVariance
* \brief The maximum variance of the current image.
*
* \var IPAActiveState::af.stable
* \brief It is set to true, if the best focus is found.
*/
/**
* \var IPASessionConfiguration::agc
* \brief AGC parameters configuration of the IPA
*
* \var IPASessionConfiguration::agc.minShutterSpeed
* \brief Minimum shutter speed supported with the configured sensor
*
* \var IPASessionConfiguration::agc.maxShutterSpeed
* \brief Maximum shutter speed supported with the configured sensor
*
* \var IPASessionConfiguration::agc.minAnalogueGain
* \brief Minimum analogue gain supported with the configured sensor
*
* \var IPASessionConfiguration::agc.maxAnalogueGain
* \brief Maximum analogue gain supported with the configured sensor
*/
/**
* \var IPASessionConfiguration::sensor
* \brief Sensor-specific configuration of the IPA
*
* \var IPASessionConfiguration::sensor.lineDuration
* \brief Line duration in microseconds
*
* \var IPASessionConfiguration::sensor.defVBlank
* \brief The default vblank value of the sensor
*/
/**
* \var IPAActiveState::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 IPAActiveState::agc.exposure
* \brief Exposure time expressed as a number of lines
*
* \var IPAActiveState::agc.gain
* \brief Analogue gain multiplier
*
* The gain should be adapted to the sensor specific gain code before applying.
*/
/**
* \var IPAActiveState::awb
* \brief Context for the Automatic White Balance algorithm
*
* \struct IPAActiveState::awb.gains
* \brief White balance gains
*
* \var IPAActiveState::awb.gains.red
* \brief White balance gain for R channel
*
* \var IPAActiveState::awb.gains.green
* \brief White balance gain for G channel
*
* \var IPAActiveState::awb.gains.blue
* \brief White balance gain for B channel
*
* \var IPAActiveState::awb.temperatureK
* \brief Estimated color temperature
*/
/**
* \var IPAActiveState::toneMapping
* \brief Context for ToneMapping and Gamma control
*
* \var IPAActiveState::toneMapping.gamma
* \brief Gamma value for the LUT
*
* \var IPAActiveState::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.
*/
/**
* \var IPAFrameContext::sensor
* \brief Effective sensor values that were applied for the frame
*
* \var IPAFrameContext::sensor.exposure
* \brief Exposure time expressed as a number of lines
*
* \var IPAFrameContext::sensor.gain
* \brief Analogue gain multiplier
*/
} /* namespace libcamera::ipa::ipu3 */
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