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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2019, Google Inc.
*
* ipa_proxy.cpp - Image Processing Algorithm proxy
*/
#include "ipa_proxy.h"
#include <string.h>
#include <unistd.h>
#include "log.h"
#include "utils.h"
#include <iostream>
/**
* \file ipa_proxy.h
* \brief IPA Proxy
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAProxy)
/**
* \class IPAProxy
* \brief IPA Proxy
*
* Isolate IPA into separate process.
*
* Every subclass of proxy shall be registered with libcamera using
* the REGISTER_IPA_PROXY() macro.
*/
/**
* \brief Construct an IPAProxy instance
*
* IPAProxy instances shall be constructed through the IPAProxyFactory::create()
* method implemented by the respective factories.
*/
IPAProxy::IPAProxy()
: valid_(false)
{
}
IPAProxy::~IPAProxy()
{
}
/**
* \fn IPAProxy::isValid()
* \brief Check if the IPAProxy instance is valid
*
* An IPAProxy instance is valid if the IPA interface is successfully created in
* isolation, and IPC is successfully set up.
*
* \return True if the IPAProxy is valid, false otherwise
*/
/**
* \brief Find a valid full path for a proxy worker for a given executable name
* \param[in] file File name of proxy worker executable
*
* A proxy worker's executable could be found in either the global installation
* directory, or in the paths specified by the environment variable
* LIBCAMERA_IPA_PROXY_PATH. This method checks the global install directory
* first, then LIBCAMERA_IPA_PROXY_PATH in order, and returns the full path to
* the proxy worker executable that is specified by file. The proxy worker
* executable shall have exec permission.
*
* \return The full path to the proxy worker executable, or an empty string if
* no valid executable path
*/
std::string IPAProxy::resolvePath(const std::string &file) const
{
/* Try finding the exec target from the install directory first */
std::string proxyFile = "/" + file;
std::string proxyPath = std::string(IPA_PROXY_DIR) + proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
/* No exec target in install directory; check env variable. */
const char *execPaths = utils::secure_getenv("LIBCAMERA_IPA_PROXY_PATH");
while (execPaths) {
const char *delim = strchrnul(execPaths, ':');
size_t count = delim - execPaths;
if (count) {
std::string proxyPath(execPaths, count);
proxyPath += proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
}
if (*delim == '\0')
break;
execPaths += count + 1;
}
return std::string();
}
/**
* \var IPAProxy::valid_
* \brief Flag to indicate if the IPAProxy instance is valid
*
* A IPAProxy instance is valid if the IPA interface is successfully created in
* isolation, and IPC is successfully set up.
*
* This flag can be read via IPAProxy::isValid().
*
* Implementations of the IPAProxy class should set this flag upon successful
* construction.
*/
/**
* \class IPAProxyFactory
* \brief Registration of IPAProxy classes and creation of instances
*
* To facilitate discovery and instantiation of IPAProxy classes, the
* IPAProxyFactory class maintains a registry of IPAProxy classes. Each
* IPAProxy subclass shall register itself using the REGISTER_IPA_PROXY()
* macro, which will create a corresponding instance of a IPAProxyFactory
* subclass and register it with the static list of factories.
*/
/**
* \brief Construct a IPAProxy factory
* \param[in] name Name of the IPAProxy class
*
* Creating an instance of the factory registers is with the global list of
* factories, accessible through the factories() function.
*
* The factory \a name is used for debugging and IPAProxy matching purposes
* and shall be unique.
*/
IPAProxyFactory::IPAProxyFactory(const char *name)
: name_(name)
{
registerType(this);
}
/**
* \fn IPAProxyFactory::create()
* \brief Create an instance of the IPAProxy corresponding to the factory
* \param[in] ipam The IPA module
*
* This virtual function is implemented by the REGISTER_IPA_PROXY() macro.
* It creates a IPAProxy instance that isolates an IPA interface designated
* by the IPA module \a ipam.
*
* \return A pointer to a newly constructed instance of the IPAProxy subclass
* corresponding to the factory
*/
/**
* \fn IPAProxyFactory::name()
* \brief Retrieve the factory name
* \return The factory name
*/
/**
* \brief Add a IPAProxy class to the registry
* \param[in] factory Factory to use to construct the IPAProxy
*
* The caller is responsible to guarantee the uniqueness of the IPAProxy name.
*/
void IPAProxyFactory::registerType(IPAProxyFactory *factory)
{
std::vector<IPAProxyFactory *> &factories = IPAProxyFactory::factories();
factories.push_back(factory);
LOG(IPAProxy, Debug)
<< "Registered proxy \"" << factory->name() << "\"";
}
/**
* \brief Retrieve the list of all IPAProxy factories
*
* The static factories map is defined inside the function to ensure it gets
* initialized on first use, without any dependency on link order.
*
* \return The list of pipeline handler factories
*/
std::vector<IPAProxyFactory *> &IPAProxyFactory::factories()
{
static std::vector<IPAProxyFactory *> factories;
return factories;
}
/**
* \def REGISTER_IPA_PROXY
* \brief Register a IPAProxy with the IPAProxy factory
* \param[in] proxy Class name of IPAProxy derived class to register
*
* Register a proxy subclass with the factory and make it available to
* isolate IPA modules.
*/
} /* namespace libcamera */
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