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/* 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;
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(MdParser *parser, unsigned int frameIntegrationDiff)
: parser_(parser), initialized_(false),
frameIntegrationDiff_(frameIntegrationDiff)
{
}
CamHelper::~CamHelper()
{
delete parser_;
}
uint32_t CamHelper::ExposureLines(double exposure_us) const
{
assert(initialized_);
return exposure_us * 1000.0 / mode_.line_length;
}
double CamHelper::Exposure(uint32_t exposure_lines) const
{
assert(initialized_);
return exposure_lines * mode_.line_length / 1000.0;
}
uint32_t CamHelper::GetVBlanking(double &exposure, double minFrameDuration,
double 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 = 1e3 * minFrameDuration / mode_.line_length;
frameLengthMax = 1e3 * 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 method.
*/
exposure_delay = 2;
gain_delay = 1;
vblank_delay = 2;
}
bool CamHelper::SensorEmbeddedDataPresent() const
{
return false;
}
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;
}
RegisterCamHelper::RegisterCamHelper(char const *cam_name,
CamHelperCreateFunc create_func)
{
cam_helpers[std::string(cam_name)] = create_func;
}
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