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For example, how it is cropped from the full sensor // area, how it is scaled, whether pixels are averaged compared to the full // resolution. // // The ability to convert between number of lines of exposure and actual // exposure time, and to convert between the sensor's gain codes and actual // gains. // // A function to return the number of frames of delay between updating exposure, // analogue gain and vblanking, and for the changes to take effect. For many // sensors these take the values 2, 1 and 2 respectively, but sensors that are // different will need to over-ride the default function provided. // // A function to query if the sensor outputs embedded data that can be parsed. // // A function to return the sensitivity of a given camera mode. // // A parser to parse the embedded data buffers provided by some sensors (for // example, the imx219 does; the ov5647 doesn't). This allows us to know for // sure the exposure and gain of the frame we're looking at. CamHelper // provides functions for converting analogue gains to and from the sensor's // native gain codes. // // Finally, a set of functions that determine how to handle the vagaries of // different camera modules on start-up or when switching modes. Some // modules may produce one or more frames that are not yet correctly exposed, // or where the metadata may be suspect. We have the following functions: // HideFramesStartup(): Tell the pipeline handler not to return this many // frames at start-up. This can also be used to hide initial frames // while the AGC and other algorithms are sorting themselves out. // HideFramesModeSwitch(): Tell the pipeline handler not to return this // many frames after a mode switch (other than start-up). Some sensors // may produce innvalid frames after a mode switch; others may not. // MistrustFramesStartup(): At start-up a sensor may return frames for // which we should not run any control algorithms (for example, metadata // may be invalid). // MistrustFramesModeSwitch(): The number of frames, after a mode switch // (other than start-up), for which control algorithms should not run // (for example, metadata may be unreliable). class CamHelper { public: static CamHelper *Create(std::string const &cam_name); CamHelper(std::unique_ptr<MdParser> parser, unsigned int frameIntegrationDiff); virtual ~CamHelper(); void SetCameraMode(const CameraMode &mode); virtual void Prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata); virtual void Process(StatisticsPtr &stats, Metadata &metadata); virtual uint32_t ExposureLines(libcamera::utils::Duration exposure) const; virtual libcamera::utils::Duration Exposure(uint32_t exposure_lines) const; virtual uint32_t GetVBlanking(libcamera::utils::Duration &exposure, libcamera::utils::Duration minFrameDuration, libcamera::utils::Duration maxFrameDuration) const; virtual uint32_t GainCode(double gain) const = 0; virtual double Gain(uint32_t gain_code) const = 0; virtual void GetDelays(int &exposure_delay, int &gain_delay, int &vblank_delay) const; virtual bool SensorEmbeddedDataPresent() const; virtual double GetModeSensitivity(const CameraMode &mode) const; virtual unsigned int HideFramesStartup() const; virtual unsigned int HideFramesModeSwitch() const; virtual unsigned int MistrustFramesStartup() const; virtual unsigned int MistrustFramesModeSwitch() const; protected: void parseEmbeddedData(libcamera::Span<const uint8_t> buffer, Metadata &metadata); virtual void PopulateMetadata(const MdParser::RegisterMap &registers, Metadata &metadata) const; std::unique_ptr<MdParser> parser_; CameraMode mode_; private: bool initialized_; /* * Smallest difference between the frame length and integration time, * in units of lines. */ unsigned int frameIntegrationDiff_; }; // This is for registering camera helpers with the system, so that the // CamHelper::Create function picks them up automatically. typedef CamHelper *(*CamHelperCreateFunc)(); struct RegisterCamHelper { RegisterCamHelper(char const *cam_name, CamHelperCreateFunc create_func); }; } // namespace RPi
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