/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2021, Raspberry Pi Ltd * * cam_helper_ov9281.cpp - camera information for ov9281 sensor */ #include <assert.h> #include "cam_helper.h" using namespace RPiController; class CamHelperOv9281 : public CamHelper { public: CamHelperOv9281(); uint32_t gainCode(double gain) const override; double gain(uint32_t gainCode) const override; void getDelays(int &exposureDelay, int &gainDelay, int &vblankDelay) const override; private: /* * Smallest difference between the frame length and integration time, * in units of lines. */ static constexpr int frameIntegrationDiff = 4; }; /* * OV9281 doesn't output metadata, so we have to use the "unicam parser" which * works by counting frames. */ CamHelperOv9281::CamHelperOv9281() : CamHelper({}, frameIntegrationDiff) { } uint32_t CamHelperOv9281::gainCode(double gain) const { return static_cast<uint32_t>(gain * 16.0); } double CamHelperOv9281::gain(uint32_t gainCode) const { return static_cast<double>(gainCode) / 16.0; } void CamHelperOv9281::getDelays(int &exposureDelay, int &gainDelay, int &vblankDelay) const { /* The driver appears to behave as follows: */ exposureDelay = 2; gainDelay = 2; vblankDelay = 2; } static CamHelper *create() { return new CamHelperOv9281(); } static RegisterCamHelper reg("ov9281", &create);