libcamera/jmondi/libcamera.git - Jacopo Mondi's clone of libcamera

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1 files changed, 5 insertions, 2 deletions

/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2019, Raspberry Pi (Trading) Limited * * cam_helper.cpp - helper information for different sensors */ #include <linux/videodev2.h> #include <assert.h> #include <map> #include <string.h> #include "libcamera/internal/v4l2_videodevice.h" #include "cam_helper.hpp" #include "md_parser.hpp" using namespace RPiController; using namespace libcamera; using libcamera::utils::Duration; namespace libcamera { LOG_DECLARE_CATEGORY(IPARPI) } static std::map<std::string, CamHelperCreateFunc> cam_helpers; CamHelper *CamHelper::Create(std::string const &cam_name) { /* * CamHelpers get registered by static RegisterCamHelper * initialisers. */ for (auto &p : cam_helpers) { if (cam_name.find(p.first) != std::string::npos) return p.second(); } return nullptr; } CamHelper::CamHelper(std::unique_ptr<MdParser> parser, unsigned int frameIntegrationDiff) : parser_(std::move(parser)), initialized_(false), frameIntegrationDiff_(frameIntegrationDiff) { } CamHelper::~CamHelper() { } void CamHelper::Prepare(Span<const uint8_t> buffer, Metadata &metadata) { parseEmbeddedData(buffer, metadata); } void CamHelper::Process([[maybe_unused]] StatisticsPtr &stats, [[maybe_unused]] Metadata &metadata) { } uint32_t CamHelper::ExposureLines(const Duration exposure) const { assert(initialized_); return exposure / mode_.line_length; } Duration CamHelper::Exposure(uint32_t exposure_lines) const { assert(initialized_); return exposure_lines * mode_.line_length; } uint32_t CamHelper::GetVBlanking(Duration &exposure, Duration minFrameDuration, Duration maxFrameDuration) const { uint32_t frameLengthMin, frameLengthMax, vblank; uint32_t exposureLines = ExposureLines(exposure); assert(initialized_); /* * minFrameDuration and maxFrameDuration are clamped by the caller * based on the limits for the active sensor mode. */ frameLengthMin = minFrameDuration / mode_.line_length; frameLengthMax = maxFrameDuration / mode_.line_length; /* * Limit the exposure to the maximum frame duration requested, and * re-calculate if it has been clipped. */ exposureLines = std::min(frameLengthMax - frameIntegrationDiff_, exposureLines); exposure = Exposure(exposureLines); /* Limit the vblank to the range allowed by the frame length limits. */ vblank = std::clamp(exposureLines + frameIntegrationDiff_, frameLengthMin, frameLengthMax) - mode_.height; return vblank; } void CamHelper::SetCameraMode(const CameraMode &mode) { mode_ = mode; if (parser_) { parser_->SetBitsPerPixel(mode.bitdepth); parser_->SetLineLengthBytes(0); /* We use SetBufferSize. */ } initialized_ = true; } void CamHelper::GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const { /* * These values are correct for many sensors. Other sensors will * need to over-ride this function.


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