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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2021, Red Hat
*
* af.h - IPU3 Af algorithm
*/
#pragma once
#include <linux/intel-ipu3.h>
#include <libcamera/base/utils.h>
#include <libcamera/geometry.h>
#include "algorithm.h"
namespace libcamera {
namespace ipa::ipu3::algorithms {
class Af : public Algorithm
{
/* The format of y_table. From ipu3-ipa repo */
typedef struct __attribute__((packed)) y_table_item {
uint16_t y1_avg;
uint16_t y2_avg;
} y_table_item_t;
public:
Af();
~Af() = default;
int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
void prepare(IPAContext &context, const uint32_t frame,
IPAFrameContext &frameContext,
ipu3_uapi_params *params) override;
void process(IPAContext &context, IPAFrameContext &frameContext,
const ipu3_uapi_stats_3a *stats) override;
private:
void afCoarseScan(IPAContext &context);
void afFineScan(IPAContext &context);
bool afScan(IPAContext &context, int min_step);
void afReset(IPAContext &context);
bool afNeedIgnoreFrame();
void afIgnoreFrameReset();
double afEstimateVariance(Span<const y_table_item_t> y_items, bool isY1);
bool afIsOutOfFocus(IPAContext &context);
/* VCM step configuration. It is the current setting of the VCM step. */
uint32_t focus_;
/* The best VCM step. It is a local optimum VCM step during scanning. */
uint32_t bestFocus_;
/* Current AF statistic variance. */
double currentVariance_;
/* The frames are ignore before starting measuring. */
uint32_t ignoreCounter_;
/* It is used to determine the derivative during scanning */
double previousVariance_;
/* The designated maximum range of focus scanning. */
uint32_t maxStep_;
/* If the coarse scan completes, it is set to true. */
bool coarseCompleted_;
/* If the fine scan completes, it is set to true. */
bool fineCompleted_;
};
} /* namespace ipa::ipu3::algorithms */
} /* namespace libcamera */
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