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https://git.libcamera.org/libcamera/libcamera.git
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aa2fe6a86f
Update CamHelper::getDelays() to return the sensor HBLANK delay. The HBLANK delay is set to the same value as VBLANK delay for all sensors in the Raspberry Pi IPA. Return the HBLANK gain delay from the IPA to the pipeline handler, and initialise DelayedControls to handle V4L2_CID_HBLANK with this delay value. As a drive-by, check that the V4L2_CID_HBLANK control is available when calling IPARPi::configure(). 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>
83 lines
2.1 KiB
C++
83 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,
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int &vblankDelay, int &hblankDelay) 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, int &hblankDelay) 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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hblankDelay = 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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