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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi Ltd
*
* cam_helper.cpp - helper information for different sensors
*/
#include <linux/videodev2.h>
#include <map>
#include <string.h>
#include "libcamera/internal/v4l2_videodevice.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)
}
static std::map<std::string, CamHelperCreateFunc> camHelpers;
CamHelper *CamHelper::create(std::string const &camName)
{
/*
* CamHelpers get registered by static RegisterCamHelper
* initialisers.
*/
for (auto &p : camHelpers) {
if (camName.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)), 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 Duration lineLength) const
{
return exposure / lineLength;
}
Duration CamHelper::exposure(uint32_t exposureLines, const Duration lineLength) const
{
return exposureLines * lineLength;
}
uint32_t CamHelper::getVBlanking(Duration &exposure,
Duration minFrameDuration,
Duration maxFrameDuration) const
{
uint32_t frameLengthMin, frameLengthMax, vblank;
uint32_t exposureLines = CamHelper::exposureLines(exposure, mode_.minLineLength);
/*
* minFrameDuration and maxFrameDuration are clamped by the caller
* based on the limits for the active sensor mode.
*/
frameLengthMin = minFrameDuration / mode_.minLineLength;
frameLengthMax = maxFrameDuration / mode_.minLineLength;
/*
* Limit the exposure to the maximum frame duration requested, and
* re-calculate if it has been clipped.
*/
exposureLines = std::min(frameLengthMax - frameIntegrationDiff_, exposureLines);
exposure = CamHelper::exposure(exposureLines, mode_.minLineLength);
/* 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_->reset();
parser_->setBitsPerPixel(mode.bitdepth);
parser_->setLineLengthBytes(0); /* We use SetBufferSize. */
}
}
void CamHelper::getDelays(int &exposureDelay, int &gainDelay,
int &vblankDelay, int &hblankDelay) const
{
/*
* These values are correct for many sensors. Other sensors will
* need to over-ride this function.
*/
exposureDelay = 2;
gainDelay = 1;
vblankDelay = 2;
hblankDelay = 2;
}
bool CamHelper::sensorEmbeddedDataPresent() const
{
return false;
}
double CamHelper::getModeSensitivity([[maybe_unused]] const CameraMode &mode) const
{
/*
* Most sensors have the same sensitivity in every mode, but this
* function can be overridden for those that do not. Note that it is
* called before mode_ is set, so it must return the sensitivity
* of the mode that is passed in.
*/
return 1.0;
}
unsigned int CamHelper::hideFramesStartup() const
{
/*
* The number of frames when a camera first starts that shouldn't be
* displayed as they are invalid in some way.
*/
return 0;
}
unsigned int CamHelper::hideFramesModeSwitch() const
{
/* After a mode switch, many sensors return valid frames immediately. */
return 0;
}
unsigned int CamHelper::mistrustFramesStartup() const
{
/* Many sensors return a single bad frame on start-up. */
return 1;
}
unsigned int CamHelper::mistrustFramesModeSwitch() const
{
/* Many sensors return valid metadata immediately. */
return 0;
}
void CamHelper::parseEmbeddedData(Span<const uint8_t> buffer,
Metadata &metadata)
{
MdParser::RegisterMap registers;
Metadata parsedMetadata;
if (buffer.empty())
return;
if (parser_->parse(buffer, registers) != MdParser::Status::OK) {
LOG(IPARPI, Error) << "Embedded data buffer parsing failed";
return;
}
populateMetadata(registers, parsedMetadata);
metadata.merge(parsedMetadata);
/*
* Overwrite the exposure/gain, frame length and sensor temperature values
* in the existing DeviceStatus with values from the parsed embedded buffer.
* Fetch it first in case any other fields were set meaningfully.
*/
DeviceStatus deviceStatus, parsedDeviceStatus;
if (metadata.get("device.status", deviceStatus) ||
parsedMetadata.get("device.status", parsedDeviceStatus)) {
LOG(IPARPI, Error) << "DeviceStatus not found";
return;
}
deviceStatus.shutterSpeed = parsedDeviceStatus.shutterSpeed;
deviceStatus.analogueGain = parsedDeviceStatus.analogueGain;
deviceStatus.frameLength = parsedDeviceStatus.frameLength;
if (parsedDeviceStatus.sensorTemperature)
deviceStatus.sensorTemperature = parsedDeviceStatus.sensorTemperature;
LOG(IPARPI, Debug) << "Metadata updated - " << deviceStatus;
metadata.set("device.status", deviceStatus);
}
void CamHelper::populateMetadata([[maybe_unused]] const MdParser::RegisterMap ®isters,
[[maybe_unused]] Metadata &metadata) const
{
}
RegisterCamHelper::RegisterCamHelper(char const *camName,
CamHelperCreateFunc createFunc)
{
camHelpers[std::string(camName)] = createFunc;
}
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