libcamera/libcamera.git - libcamera official repository

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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2022, Raspberry Pi Ltd
 *
 * cam_helper_imx708.cpp - camera helper for imx708 sensor
 */

#include <cmath>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>

#include <libcamera/base/log.h>

#include "controller/pdaf_data.h"

#include "cam_helper.h"
#include "md_parser.h"

using namespace RPiController;
using namespace libcamera;
using libcamera::utils::Duration;

using namespace std::literals::chrono_literals;

namespace libcamera {
LOG_DECLARE_CATEGORY(IPARPI)
}

/*
 * We care about two gain registers and a pair of exposure registers. Their
 * I2C addresses from the Sony imx708 datasheet:
 */
constexpr uint32_t expHiReg = 0x0202;
constexpr uint32_t expLoReg = 0x0203;
constexpr uint32_t gainHiReg = 0x0204;
constexpr uint32_t gainLoReg = 0x0205;
constexpr uint32_t frameLengthHiReg = 0x0340;
constexpr uint32_t frameLengthLoReg = 0x0341;
constexpr uint32_t lineLengthHiReg = 0x0342;
constexpr uint32_t lineLengthLoReg = 0x0343;
constexpr uint32_t temperatureReg = 0x013a;
constexpr std::initializer_list<uint32_t> registerList =
	{ expHiReg, expLoReg, gainHiReg, gainLoReg, lineLengthHiReg,
	  lineLengthLoReg, frameLengthHiReg, frameLengthLoReg, temperatureReg };

class CamHelperImx708 : public CamHelper
{
public:
	CamHelperImx708();
	uint32_t gainCode(double gain) const override;
	double gain(uint32_t gain_code) const override;
	void prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata) override;
	void process(StatisticsPtr &stats, Metadata &metadata) override;
	std::pair<uint32_t, uint32_t> getBlanking(Duration &exposure, Duration minFrameDuration,
						  Duration maxFrameDuration) const override;
	void getDelays(int &exposureDelay, int &gainDelay,
		       int &vblankDelay, int &hblankDelay) const override;
	bool sensorEmbeddedDataPresent() const override;
	double getModeSensitivity(const CameraMode &mode) const override;
	unsigned int hideFramesModeSwitch() const override;
	unsigned int hideFramesStartup() const override;

private:
	/*
	 * Smallest difference between the frame length and integration time,
	 * in units of lines.
	 */
	static constexpr int frameIntegrationDiff = 22;
	/* Maximum frame length allowable for long exposure calculations. */
	static constexpr int frameLengthMax = 0xffdc;
	/* Largest long exposure scale factor given as a left shift on the frame length. */
	static constexpr int longExposureShiftMax = 7;

	static constexpr int pdafStatsRows = 12;
	static constexpr int pdafStatsCols = 16;

	void populateMetadata(const MdParser::RegisterMap &registers,
			      Metadata &metadata) const override;

	static bool parsePdafData(const uint8_t *ptr, size_t len, unsigned bpp,
				  PdafRegions &pdaf);

	bool parseAEHist(const uint8_t *ptr, size_t len, unsigned bpp);
	void putAGCStatistics(StatisticsPtr stats);

	Histogram aeHistLinear_;
	uint32_t aeHistAverage_;
	bool aeHistValid_;
};

CamHelperImx708::CamHelperImx708()
	: CamHelper(std::make_unique<MdParserSmia>(registerList), frameIntegrationDiff),
	  aeHistLinear_{}, aeHistAverage_(0), aeHistValid_(false)
{
}

uint32_t CamHelperImx708::gainCode(double gain) const
{
	return static_cast<uint32_t>(1024 - 1024 / gain);
}

double CamHelperImx708::gain(uint32_t gain_code) const
{
	return 1024.0 / (1024 - gain_code);
}

void CamHelperImx708::prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata)
{
	MdParser::RegisterMap registers;
	DeviceStatus deviceStatus;

	LOG(IPARPI, Debug) << "Embedded buffer size: " << buffer.size();

	if (metadata.get("device.status", deviceStatus)) {
		LOG(IPARPI, Error) << "DeviceStatus not found from DelayedControls";
		return;
	}

	parseEmbeddedData(buffer, metadata);

	/*


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