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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 "libcamera/internal/ipa_proxy.h"
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include "libcamera/internal/ipa_module.h"
/**
* \file ipa_proxy.h
* \brief IPA Proxy
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAProxy)
/**
* \class IPAProxy
* \brief IPA Proxy
*
* Isolate IPA into separate process.
*/
/**
* \enum IPAProxy::ProxyState
* \brief Identifies the available operational states of the proxy
*
* \var IPAProxy::ProxyStopped
* \brief The proxy is not active and only synchronous operations are permitted
* \var IPAProxy::ProxyStopping
* \brief No new tasks can be submitted to the proxy, however existing events
* can be completed
* \var IPAProxy::ProxyRunning
* \brief The Proxy is active and asynchronous tasks may be queued
*/
/**
* \brief Construct an IPAProxy instance
* \param[in] ipam The IPA module
*/
IPAProxy::IPAProxy(IPAModule *ipam)
: valid_(false), state_(ProxyStopped), ipam_(ipam)
{
}
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 Retrieve the absolute path to an IPA configuration file
* \param[in] name The configuration file name
*
* This function locates the configuration file for an IPA and returns its
* absolute path. It searches the following directories, in order:
*
* - All directories specified in the colon-separated LIBCAMERA_IPA_CONFIG_PATH
* environment variable ; or
* - If libcamera is not installed, the src/ipa/ directory within the source
* tree ; otherwise
* - The system sysconf (etc/libcamera/ipa) and the data (share/libcamera/ipa/)
* directories.
*
* The system directories are not searched if libcamera is not installed.
*
* Within each of those directories, the function looks for a subdirectory
* named after the IPA module name, as reported in IPAModuleInfo::name, and for
* a file named \a name within that directory. The \a name is IPA-specific.
*
* \return The full path to the IPA configuration file, or an empty string if
* no configuration file can be found
*/
std::string IPAProxy::configurationFile(const std::string &name) const
{
struct stat statbuf;
int ret;
/*
* The IPA module name can be used as-is to build directory names as it
* has been validated when loading the module.
*/
std::string ipaName = ipam_->info().name;
/* Check the environment variable first. */
const char *confPaths = utils::secure_getenv("LIBCAMERA_IPA_CONFIG_PATH");
if (confPaths) {
for (const auto &dir : utils::split(confPaths, ":")) {
if (dir.empty())
continue;
std::string confPath = dir + "/" + ipaName + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
}
}
std::string root = utils::libcameraSourcePath();
if (!root.empty()) {
/*
* When libcamera is used before it is installed, load
* configuration files from the source directory. The
* configuration files are then located in the 'data'
* subdirectory of the corresponding IPA module.
*/
std::string ipaConfDir = root + "src/ipa/" + ipaName + "/data";
LOG(IPAProxy, Info)
<< "libcamera is not installed. Loading IPA configuration from '"
<< ipaConfDir << "'";
std::string confPath = ipaConfDir + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
} else {
/* Else look in the system locations. */
for (const auto &dir : utils::split(IPA_CONFIG_DIR, ":")) {
std::string confPath = dir + "/" + ipaName + "/" + name;
ret = stat(confPath.c_str(), &statbuf);
if (ret == 0 && (statbuf.st_mode & S_IFMT) == S_IFREG)
return confPath;
}
}
LOG(IPAProxy, Error)
<< "Configuration file '" << name
<< "' not found for IPA module '" << ipaName << "'";
return std::string();
}
/**
* \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 function 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
{
std::string proxyFile = "/" + file;
/* Check env variable first. */
const char *execPaths = utils::secure_getenv("LIBCAMERA_IPA_PROXY_PATH");
if (execPaths) {
for (const auto &dir : utils::split(execPaths, ":")) {
if (dir.empty())
continue;
std::string proxyPath = dir;
proxyPath += proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
}
}
/*
* When libcamera is used before it is installed, load proxy workers
* from the same build directory as the libcamera directory itself.
* This requires identifying the path of the libcamera.so, and
* referencing a relative path for the proxy workers from that point.
*/
std::string root = utils::libcameraBuildPath();
if (!root.empty()) {
std::string ipaProxyDir = root + "src/libcamera/proxy/worker";
LOG(IPAProxy, Info)
<< "libcamera is not installed. Loading proxy workers from '"
<< ipaProxyDir << "'";
std::string proxyPath = ipaProxyDir + proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
return std::string();
}
/* Else try finding the exec target from the install directory. */
std::string proxyPath = std::string(IPA_PROXY_DIR) + proxyFile;
if (!access(proxyPath.c_str(), X_OK))
return proxyPath;
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.
*/
/**
* \var IPAProxy::state_
* \brief Current state of the IPAProxy
*
* The IPAProxy can be Running, Stopped, or Stopping.
*
* This state provides a means to ensure that asynchronous functions are only
* called while the proxy is running, and prevent new tasks being submitted
* while still enabling events to complete when the IPAProxy is stopping.
*/
} /* namespace libcamera */
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