libcamera/vivid.git - libcamera pipeline handler for VIVID

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Diffstat (limited to 'src/cam/meson.build')

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/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2019, Raspberry Pi (Trading) Limited * * cam_helper_imx219.cpp - camera helper for imx219 sensor */ #include <assert.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> /* * We have observed that the imx219 embedded data stream randomly returns junk * register values. Do not rely on embedded data until this has been resolved. */ #define ENABLE_EMBEDDED_DATA 0 #include "cam_helper.hpp" #if ENABLE_EMBEDDED_DATA #include "md_parser.hpp" #endif using namespace RPiController; /* Metadata parser implementation specific to Sony IMX219 sensors. */ class MdParserImx219 : public MdParserSmia { public: MdParserImx219(); Status Parse(libcamera::Span<const uint8_t> buffer) override; Status GetExposureLines(unsigned int &lines) override; Status GetGainCode(unsigned int &gain_code) override; private: /* Offset of the register's value in the metadata block. */ int reg_offsets_[3]; /* Value of the register, once read from the metadata block. */ int reg_values_[3]; }; class CamHelperImx219 : public CamHelper { public: CamHelperImx219(); uint32_t GainCode(double gain) const override; double Gain(uint32_t gain_code) const override; unsigned int MistrustFramesModeSwitch() const override; bool SensorEmbeddedDataPresent() const override; private: /* * Smallest difference between the frame length and integration time, * in units of lines. */ static constexpr int frameIntegrationDiff = 4; }; CamHelperImx219::CamHelperImx219() #if ENABLE_EMBEDDED_DATA : CamHelper(new MdParserImx219(), frameIntegrationDiff) #else : CamHelper(nullptr, frameIntegrationDiff) #endif { } uint32_t CamHelperImx219::GainCode(double gain) const { return (uint32_t)(256 - 256 / gain); } double CamHelperImx219::Gain(uint32_t gain_code) const { return 256.0 / (256 - gain_code); } unsigned int CamHelperImx219::MistrustFramesModeSwitch() const { /* * For reasons unknown, we do occasionally get a bogus metadata frame * at a mode switch (though not at start-up). Possibly warrants some * investigation, though not a big deal. */ return 1; } bool CamHelperImx219::SensorEmbeddedDataPresent() const { return ENABLE_EMBEDDED_DATA; } static CamHelper *Create() { return new CamHelperImx219(); } static RegisterCamHelper reg("imx219", &Create); /* * We care about one gain register and a pair of exposure registers. Their I2C * addresses from the Sony IMX219 datasheet: */ #define GAIN_REG 0x157 #define EXPHI_REG 0x15A #define EXPLO_REG 0x15B /* * Index of each into the reg_offsets and reg_values arrays. Must be in * register address order. */ #define GAIN_INDEX 0 #define EXPHI_INDEX 1 #define EXPLO_INDEX 2 MdParserImx219::MdParserImx219() { reg_offsets_[0] = reg_offsets_[1] = reg_offsets_[2] = -1; } MdParser::Status MdParserImx219::Parse(libcamera::Span<const uint8_t> buffer) { bool try_again = false; if (reset_) { /* * Search again through the metadata for the gain and exposure * registers. */ assert(bits_per_pixel_); assert(num_lines_ || buffer_size_bytes_); /* Need to be ordered */ uint32_t regs[3] = { GAIN_REG, EXPHI_REG, EXPLO_REG }; reg_offsets_[0] = reg_offsets_[1] = reg_offsets_[2] = -1; int ret = static_cast<int>(findRegs(buffer, regs, reg_offsets_, 3)); /* * > 0 means "worked partially but parse again next time", * < 0 means "hard error". */ if (ret > 0) try_again = true; else if (ret < 0) return ERROR; } for (int i = 0; i < 3; i++) { if (reg_offsets_[i] == -1) continue; reg_values_[i] = buffer[reg_offsets_[i]]; } /* Re-parse next time if we were unhappy in some way. */ reset_ = try_again; return OK; } MdParser::Status MdParserImx219::GetExposureLines(unsigned int &lines) { if (reg_offsets_[EXPHI_INDEX] == -1 || reg_offsets_[EXPLO_INDEX] == -1) return NOTFOUND; lines = reg_values_[EXPHI_INDEX] * 256 + reg_values_[EXPLO_INDEX]; return OK; } MdParser::Status MdParserImx219::GetGainCode(unsigned int &gain_code) { if (reg_offsets_[GAIN_INDEX] == -1) return NOTFOUND; gain_code = reg_values_[GAIN_INDEX]; return OK; }


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