libcamera/vivid.git - libcamera pipeline handler for VIVID

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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
 * Copyright (C) 2019, Google Inc.
 *
 * 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.
 *
 * ~~~~
 * +---------------+                   +---------------+


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