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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 "libcamera/internal/ipa_manager.h"
#include <algorithm>
#include <dirent.h>
#include <string.h>
#include <sys/types.h>
#include <libcamera/base/file.h>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include "libcamera/internal/ipa_module.h"
#include "libcamera/internal/ipa_proxy.h"
#include "libcamera/internal/pipeline_handler.h"
/**
* \file ipa_manager.h
* \brief Image Processing Algorithm module manager
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPAManager)
/**
* \class IPAManager
* \brief Manager for IPA modules
*
* The IPA module manager discovers IPA modules from disk, queries and loads
* them, and creates IPA contexts. It supports isolation of the modules in a
* separate process with IPC communication and offers a unified IPAInterface
* view of the IPA contexts to pipeline handlers regardless of whether the
* modules are isolated or loaded in the same process.
*
* Module isolation is based on the module licence. Open-source modules are
* loaded without isolation, while closed-source module are forcefully isolated.
* The isolation mechanism ensures that no code from a closed-source module is
* ever run in the libcamera process.
*
* To create an IPA context, pipeline handlers call the IPAManager::createIPA()
* function. For a directly loaded module, the manager calls the module's
* ipaCreate() function directly and wraps the returned context in an
* IPAContextWrapper that exposes an IPAInterface.
*
* ~~~~
* +---------------+
* | Pipeline |
* | Handler |
* +---------------+
* |
* v
* +---------------+ +---------------+
* | IPA | | Open Source |
* | Interface | | IPA Module |
* | - - - - - - - | | - - - - - - - |
* | IPA Context | ipa_context_ops | ipa_context |
* | Wrapper | ----------------> | |
* +---------------+ +---------------+
* ~~~~
*
* For an isolated module, the manager instantiates an IPAProxy which spawns a
* new process for an IPA proxy worker. The worker loads the IPA module and
* creates the IPA context. The IPAProxy alse exposes an IPAInterface.
*
* ~~~~
* +---------------+ +---------------+
* | Pipeline | | Closed Source |
* | Handler | | IPA Module |
* +---------------+ | - - - - - - - |
* | | ipa_context |
* v | |
* +---------------+ +---------------+
* | IPA | ipa_context_ops ^
* | Interface | |
* | - - - - - - - | +---------------+
* | IPA Proxy | operations | IPA Proxy |
* | | ----------------> | Worker |
* +---------------+ over IPC +---------------+
* ~~~~
*
* The IPAInterface implemented by the IPAContextWrapper or IPAProxy is
* returned to the pipeline handler, and all interactions with the IPA context
* go the same interface regardless of process isolation.
*
* In all cases the data passed to the IPAInterface member functions is
* serialized to Plain Old Data, either for the purpose of passing it to the IPA
* context plain C API, or to transmit the data to the isolated process through
* IPC.
*/
IPAManager *IPAManager::self_ = nullptr;
/**
* \brief Construct an IPAManager instance
*
* The IPAManager class is meant to only be instantiated once, by the
* CameraManager.
*/
IPAManager::IPAManager()
{
if (self_)
LOG(IPAManager, Fatal)
<< "Multiple IPAManager objects are not allowed";
unsigned int ipaCount = 0;
/* User-specified paths take precedence. */
const char *modulePaths = utils::secure_getenv("LIBCAMERA_IPA_MODULE_PATH");
if (modulePaths) {
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