/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2021, Raspberry Pi (Trading) Limited * * cam_helper_ov9281.cpp - camera information for ov9281 sensor */ #include <assert.h> #include "cam_helper.hpp" using namespace RPiController; class CamHelperOv9281 : public CamHelper { public: CamHelperOv9281(); uint32_t GainCode(double gain) const override; double Gain(uint32_t gain_code) const override; void GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) 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 gain_code) const { return static_cast<double>(gain_code) / 16.0; } void CamHelperOv9281::GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const { /* The driver appears to behave as follows: */ exposure_delay = 2; gain_delay = 2; vblank_delay = 2; } static CamHelper *Create() { return new CamHelperOv9281(); } static RegisterCamHelper reg("ov9281", &Create);