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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* ipa_manager.cpp - Image Processing Algorithm module manager
*/
#include "ipa_manager.h"
#include <dirent.h>
#include <string.h>
#include <sys/types.h>
#include "ipa_module.h"
#include "log.h"
#include "pipeline_handler.h"
#include "utils.h"
/**
* \file ipa_manager.h
* \brief Image Processing Algorithm module manager
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAManager)
/**
* \class IPAManager
* \brief Manager for IPA modules
*/
IPAManager::IPAManager()
{
addDir(IPA_MODULE_DIR);
const char *modulePaths = utils::secure_getenv("LIBCAMERA_IPA_MODULE_PATH");
if (!modulePaths)
return;
while (1) {
const char *delim = strchrnul(modulePaths, ':');
size_t count = delim - modulePaths;
if (count) {
std::string path(modulePaths, count);
addDir(path.c_str());
}
if (*delim == '\0')
break;
modulePaths += count + 1;
}
}
IPAManager::~IPAManager()
{
for (IPAModule *module : modules_)
delete module;
}
/**
* \brief Retrieve the IPA manager instance
*
* The IPAManager is a singleton and can't be constructed manually. This
* function shall instead be used to retrieve the single global instance of the
* manager.
*
* \return The IPA manager instance
*/
IPAManager *IPAManager::instance()
{
static IPAManager ipaManager;
return &ipaManager;
}
/**
* \brief Load IPA modules from a directory
* \param[in] libDir directory to search for IPA modules
*
* This method tries to create an IPAModule instance for every shared object
* found in \a libDir, and skips invalid IPA modules.
*
* \return Number of modules loaded by this call, or a negative error code
* otherwise
*/
int IPAManager::addDir(const char *libDir)
{
struct dirent *ent;
DIR *dir;
dir = opendir(libDir);
if (!dir) {
int ret = -errno;
LOG(IPAManager, Error)
<< "Invalid path " << libDir << " for IPA modules: "
<< strerror(-ret);
return ret;
}
unsigned int count = 0;
while ((ent = readdir(dir)) != nullptr) {
int offset = strlen(ent->d_name) - 3;
if (offset < 0)
continue;
if (strcmp(&ent->d_name[offset], ".so"))
continue;
IPAModule *ipaModule = new IPAModule(std::string(libDir) +
"/" + ent->d_name);
if (!ipaModule->isValid()) {
delete ipaModule;
continue;
}
modules_.push_back(ipaModule);
count++;
}
closedir(dir);
return count;
}
/**
* \brief Create an IPA interface that matches a given pipeline handler
* \param[in] pipe The pipeline handler that wants a matching IPA interface
* \param[in] minVersion Minimum acceptable version of IPA module
* \param[in] maxVersion Maximum acceptable version of IPA module
*
* \return A newly created IPA interface, or nullptr if no matching
* IPA module is found
*/
std::unique_ptr<IPAInterface> IPAManager::createIPA(PipelineHandler *pipe,
uint32_t maxVersion,
uint32_t minVersion)
{
IPAModule *m = nullptr;
for (IPAModule *module : modules_) {
if (module->match(pipe, minVersion, maxVersion)) {
m = module;
break;
}
}
if (!m || !m->load())
return nullptr;
return m->createInstance();
}
} /* namespace libcamera */
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