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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi Ltd
*
* ISP controller
*/
#include <assert.h>
#include <libcamera/base/file.h>
#include <libcamera/base/log.h>
#include "libcamera/internal/yaml_parser.h"
#include "algorithm.h"
#include "controller.h"
using namespace RPiController;
using namespace libcamera;
using namespace std::literals::chrono_literals;
LOG_DEFINE_CATEGORY(RPiController)
static const std::map<std::string, Controller::HardwareConfig> HardwareConfigMap = {
{
"bcm2835",
{
/*
* There are only ever 15 AGC regions computed by the firmware
* due to zoning, but the HW defines AGC_REGIONS == 16!
*/
.agcRegions = { 15 , 1 },
.agcZoneWeights = { 15 , 1 },
.awbRegions = { 16, 12 },
.cacRegions = { 0, 0 },
.focusRegions = { 4, 3 },
.numHistogramBins = 128,
.numGammaPoints = 33,
.pipelineWidth = 13,
.statsInline = false,
.minPixelProcessingTime = 0s,
}
},
{
"pisp",
{
.agcRegions = { 0, 0 },
.agcZoneWeights = { 15, 15 },
.awbRegions = { 32, 32 },
.cacRegions = { 8, 8 },
.focusRegions = { 8, 8 },
.numHistogramBins = 1024,
.numGammaPoints = 64,
.pipelineWidth = 16,
.statsInline = true,
/*
* The constraint below is on the rate of pixels going
* from CSI2 peripheral to ISP-FE (400Mpix/s, plus tiny
* overheads per scanline, for which 380Mpix/s is a
* conservative bound).
*
* There is a 64kbit data FIFO before the bottleneck,
* which means that in all reasonable cases the
* constraint applies at a timescale >= 1 scanline, so
* adding horizontal blanking can prevent loss.
*
* If the backlog were to grow beyond 64kbit during a
* single scanline, there could still be loss. This
* could happen using 4 lanes at 1.5Gbps at 10bpp with
* frames wider than ~16,000 pixels.
*/
.minPixelProcessingTime = 1.0us / 380,
}
},
};
Controller::Controller()
: switchModeCalled_(false)
{
}
Controller::~Controller() {}
int Controller::read(char const *filename)
{
File file(filename);
if (!file.open(File::OpenModeFlag::ReadOnly)) {
LOG(RPiController, Warning)
<< "Failed to open tuning file '" << filename << "'";
return -EINVAL;
}
std::unique_ptr<YamlObject> root = YamlParser::parse(file);
if (!root)
return -EINVAL;
double version = (*root)["version"].get<double>(1.0);
target_ = (*root)["target"].get<std::string>("bcm2835");
if (version < 2.0) {
LOG(RPiController, Warning)
<< "This format of the tuning file will be deprecated soon!"
<< " Please use the convert_tuning.py utility to update to version 2.0.";
for (auto const &[key, value] : root->asDict()) {
int ret = createAlgorithm(key, value);
if (ret)
return ret;
}
} else if (version < 3.0) {
if (!root->contains("algorithms")) {
LOG(RPiController, Error)
<< "Tuning file " << filename
<< " does not have an \"algorithms\" list!";
return -EINVAL;
}
for (auto const &rootAlgo : (*root)["algorithms"].asList())
for (auto const &[key, value] : rootAlgo.asDict()) {
int ret = createAlgorithm(key, value);
if (ret)
return ret;
}
} else {
LOG(RPiController, Error)
<< "Unrecognised version " << version
<< " for the tuning file " << filename;
return -EINVAL;
}
return 0;
}
int Controller::createAlgorithm(const std::string &name, const YamlObject ¶ms)
{
auto it = getAlgorithms().find(name);
if (it == getAlgorithms().end()) {
LOG(RPiController, Warning)
<< "No algorithm found for \"" << name << "\"";
return 0;
}
Algorithm *algo = (*it->second)(this);
int ret = algo->read(params);
if (ret)
return ret;
algorithms_.push_back(AlgorithmPtr(algo));
return 0;
}
void Controller::initialise()
{
for (auto &algo : algorithms_)
algo->initialise();
}
void Controller::switchMode(CameraMode const &cameraMode, Metadata *metadata)
{
for (auto &algo : algorithms_)
algo->switchMode(cameraMode, metadata);
switchModeCalled_ = true;
}
void Controller::prepare(Metadata *imageMetadata)
{
assert(switchModeCalled_);
for (auto &algo : algorithms_)
algo->prepare(imageMetadata);
}
void Controller::process(StatisticsPtr stats, Metadata *imageMetadata)
{
assert(switchModeCalled_);
for (auto &algo : algorithms_)
algo->process(stats, imageMetadata);
}
Metadata &Controller::getGlobalMetadata()
{
return globalMetadata_;
}
Algorithm *Controller::getAlgorithm(std::string const &name) const
{
/*
* The passed name must be the entire algorithm name, or must match the
* last part of it with a period (.) just before.
*/
size_t nameLen = name.length();
for (auto &algo : algorithms_) {
char const *algoName = algo->name();
size_t algoNameLen = strlen(algoName);
if (algoNameLen >= nameLen &&
strcasecmp(name.c_str(),
algoName + algoNameLen - nameLen) == 0 &&
(nameLen == algoNameLen ||
algoName[algoNameLen - nameLen - 1] == '.'))
return algo.get();
}
return nullptr;
}
const std::string &Controller::getTarget() const
{
return target_;
}
const Controller::HardwareConfig &Controller::getHardwareConfig() const
{
auto cfg = HardwareConfigMap.find(getTarget());
/*
* This really should not happen, the IPA ought to validate the target
* on initialisation.
*/
ASSERT(cfg != HardwareConfigMap.end());
return cfg->second;
}
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