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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2020, Raspberry Pi Ltd
*
* cam_helper_imx477.cpp - camera helper for imx477 sensor
*/
#include <algorithm>
#include <assert.h>
#include <cmath>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <libcamera/base/log.h>
#include "cam_helper.h"
#include "md_parser.h"
using namespace RPiController;
using namespace libcamera;
using libcamera::utils::Duration;
namespace libcamera {
LOG_DECLARE_CATEGORY(IPARPI)
}
/*
* We care about two gain registers and a pair of exposure registers. Their
* I2C addresses from the Sony IMX477 datasheet:
*/
constexpr uint32_t expHiReg = 0x0202;
constexpr uint32_t expLoReg = 0x0203;
constexpr uint32_t gainHiReg = 0x0204;
constexpr uint32_t gainLoReg = 0x0205;
constexpr uint32_t frameLengthHiReg = 0x0340;
constexpr uint32_t frameLengthLoReg = 0x0341;
constexpr uint32_t temperatureReg = 0x013a;
constexpr std::initializer_list<uint32_t> registerList =
{ expHiReg, expLoReg, gainHiReg, gainLoReg, frameLengthHiReg, frameLengthLoReg, temperatureReg };
class CamHelperImx477 : public CamHelper
{
public:
CamHelperImx477();
uint32_t gainCode(double gain) const override;
double gain(uint32_t gainCode) const override;
void prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata) override;
std::pair<uint32_t, uint32_t> getBlanking(Duration &exposure, Duration minFrameDuration,
Duration maxFrameDuration) const override;
void getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const override;
bool sensorEmbeddedDataPresent() const override;
private:
/*
* Smallest difference between the frame length and integration time,
* in units of lines.
*/
static constexpr int frameIntegrationDiff = 22;
/* Maximum frame length allowable for long exposure calculations. */
static constexpr int frameLengthMax = 0xffdc;
/* Largest long exposure scale factor given as a left shift on the frame length. */
static constexpr int longExposureShiftMax = 7;
void populateMetadata(const MdParser::RegisterMap ®isters,
Metadata &metadata) const override;
};
CamHelperImx477::CamHelperImx477()
: CamHelper(std::make_unique<MdParserSmia>(registerList), frameIntegrationDiff)
{
}
uint32_t CamHelperImx477::gainCode(double gain) const
{
return static_cast<uint32_t>(1024 - 1024 / gain);
}
double CamHelperImx477::gain(uint32_t gainCode) const
{
return 1024.0 / (1024 - gainCode);
}
void CamHelperImx477::prepare(libcamera::Span<const uint8_t> buffer, Metadata &metadata)
{
MdParser::RegisterMap registers;
DeviceStatus deviceStatus;
if (metadata.get("device.status", deviceStatus)) {
LOG(IPARPI, Error) << "DeviceStatus not found from DelayedControls";
return;
}
parseEmbeddedData(buffer, metadata);
/*
* The DeviceStatus struct is first populated with values obtained from
* DelayedControls. If this reports frame length is > frameLengthMax,
* it means we are using a long exposure mode. Since the long exposure
* scale factor is not returned back through embedded data, we must rely
* on the existing exposure lines and frame length values returned by
* DelayedControls.
*
* Otherwise, all values are updated with what is reported in the
* embedded data.
*/
if (deviceStatus.frameLength > frameLengthMax) {
DeviceStatus parsedDeviceStatus;
metadata.get("device.status", parsedDeviceStatus);
parsedDeviceStatus.shutterSpeed = deviceStatus.shutterSpeed;
parsedDeviceStatus.frameLength = deviceStatus.frameLength;
metadata.set("device.status", parsedDeviceStatus);
LOG(IPARPI, Debug) << "Metadata updated for long exposure: "
<< parsedDeviceStatus;
}
}
std::pair<uint32_t, uint32_t> CamHelperImx477::getBlanking(Duration &exposure,
Duration minFrameDuration,
Duration maxFrameDuration) const
{
uint32_t frameLength, exposureLines;
unsigned int shift = 0;
auto [vblank, hblank] = CamHelper::getBlanking(exposure, minFrameDuration,
maxFrameDuration);
frameLength = mode_.height + vblank;
Duration lineLength = hblankToLineLength(hblank);
/*
* Check if the frame length calculated needs to be setup for long
* exposure mode. This will require us to use a long exposure scale
* factor provided by a shift operation in the sensor.
*/
while (frameLength > frameLengthMax) {
if (++shift > longExposureShiftMax) {
shift = longExposureShiftMax;
frameLength = frameLengthMax;
break;
}
frameLength >>= 1;
}
if (shift) {
/* Account for any rounding in the scaled frame length value. */
frameLength <<= shift;
exposureLines = CamHelperImx477::exposureLines(exposure, lineLength);
exposureLines = std::min(exposureLines, frameLength - frameIntegrationDiff);
exposure = CamHelperImx477::exposure(exposureLines, lineLength);
}
return { frameLength - mode_.height, hblank };
}
void CamHelperImx477::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const
{
exposureDelay = 2;
gainDelay = 2;
vblankDelay = 3;
hblankDelay = 3;
}
bool CamHelperImx477::sensorEmbeddedDataPresent() const
{
return true;
}
void CamHelperImx477::populateMetadata(const MdParser::RegisterMap ®isters,
Metadata &metadata) const
{
DeviceStatus deviceStatus;
deviceStatus.shutterSpeed = exposure(registers.at(expHiReg) * 256 + registers.at(expLoReg),
mode_.minLineLength);
deviceStatus.analogueGain = gain(registers.at(gainHiReg) * 256 + registers.at(gainLoReg));
deviceStatus.frameLength = registers.at(frameLengthHiReg) * 256 + registers.at(frameLengthLoReg);
deviceStatus.sensorTemperature = std::clamp<int8_t>(registers.at(temperatureReg), -20, 80);
metadata.set("device.status", deviceStatus);
}
static CamHelper *create()
{
return new CamHelperImx477();
}
static RegisterCamHelper reg("imx477", &create);
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