f9c490ab25
Update CamHelper::exposureLines() and CamHelper::exposure() to take a line length duration parameter for use in the exposure calculations. For now, only use the minimum line length for all the calculations to match the existing IPA behavior. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/* SPDX-License-Identifier: BSD-2-Clause */
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/*
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* Copyright (C) 2020, Raspberry Pi Ltd
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*
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* cam_helper_imx296.cpp - Camera helper for IMX296 sensor
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*/
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#include <algorithm>
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#include <cmath>
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#include <stddef.h>
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#include "cam_helper.h"
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using namespace RPiController;
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using libcamera::utils::Duration;
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using namespace std::literals::chrono_literals;
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class CamHelperImx296 : public CamHelper
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{
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public:
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CamHelperImx296();
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uint32_t gainCode(double gain) const override;
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double gain(uint32_t gainCode) const override;
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uint32_t exposureLines(const Duration exposure, const Duration lineLength) const override;
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Duration exposure(uint32_t exposureLines, const Duration lineLength) const override;
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void getDelays(int &exposureDelay, int &gainDelay, int &vblankDelay) const override;
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private:
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static constexpr uint32_t minExposureLines = 1;
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static constexpr uint32_t maxGainCode = 239;
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static constexpr Duration timePerLine = 550.0 / 37.125e6 * 1.0s;
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/*
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* Smallest difference between the frame length and integration time,
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* in units of lines.
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*/
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static constexpr int frameIntegrationDiff = 4;
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};
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CamHelperImx296::CamHelperImx296()
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: CamHelper(nullptr, frameIntegrationDiff)
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{
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}
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uint32_t CamHelperImx296::gainCode(double gain) const
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{
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uint32_t code = 20 * std::log10(gain) * 10;
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return std::min(code, maxGainCode);
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}
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double CamHelperImx296::gain(uint32_t gainCode) const
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{
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return std::pow(10.0, gainCode / 200.0);
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}
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uint32_t CamHelperImx296::exposureLines(const Duration exposure,
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[[maybe_unused]] const Duration lineLength) const
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{
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return std::max<uint32_t>(minExposureLines, (exposure - 14.26us) / timePerLine);
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}
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Duration CamHelperImx296::exposure(uint32_t exposureLines,
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[[maybe_unused]] const Duration lineLength) const
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{
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return std::max<uint32_t>(minExposureLines, exposureLines) * timePerLine + 14.26us;
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}
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void CamHelperImx296::getDelays(int &exposureDelay, int &gainDelay,
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int &vblankDelay) const
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{
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exposureDelay = 2;
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gainDelay = 2;
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vblankDelay = 2;
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}
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static CamHelper *create()
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{
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return new CamHelperImx296();
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}
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static RegisterCamHelper reg("imx296", &create);
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