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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 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.
*/
/**
* \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::agc
* \brief AGC parameters configuration of the IPA
*
* \var IPASessionConfiguration::agc.minShutterSpeed
* \brief Minimum shutter speed supported with the configured sensor
*
* \var IPASessionConfiguration::grid.maxShutterSpeed
* \brief Maximum shutter speed supported with the configured sensor
*
* \var IPASessionConfiguration::grid.minAnalogueGain
* \brief Minimum analogue gain supported with the configured sensor
*
* \var IPASessionConfiguration::grid.maxAnalogueGain
* \brief Maximum analogue gain supported with the configured sensor
*/
/**
* \var 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.
*/
/**
* \var 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
*/
/**
* \var IPAFrameContext::toneMapping
* \brief Context for ToneMapping and Gamma control
*
* \var IPAFrameContext::toneMapping.gamma
* \brief Gamma value for the LUT
*
* \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.
*/
} /* namespace libcamera::ipa::ipu3 */
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