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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2018, Google Inc.
*
* camera_manager.h - Camera management
*/
#include <libcamera/camera_manager.h>
#include <libcamera/camera.h>
#include <libcamera/event_dispatcher.h>
#include "device_enumerator.h"
#include "event_dispatcher_poll.h"
#include "log.h"
#include "pipeline_handler.h"
#include "thread.h"
#include "utils.h"
/**
* \file camera_manager.h
* \brief The camera manager
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(Camera)
/**
* \class CameraManager
* \brief Provide access and manage all cameras in the system
*
* The camera manager is the entry point to libcamera. It enumerates devices,
* associates them with pipeline managers, and provides access to the cameras
* in the system to applications. The manager owns all Camera objects and
* handles hot-plugging and hot-unplugging to manage the lifetime of cameras.
*
* To interact with libcamera, an application starts by creating a camera
* manager instance. Only a single instance of the camera manager may exist at
* a time. Attempting to create a second instance without first deleting the
* existing instance results in undefined behaviour.
*
* The manager is initially stopped, and shall be configured before being
* started. In particular a custom event dispatcher shall be installed if
* needed with CameraManager::setEventDispatcher().
*
* Once the camera manager is configured, it shall be started with start().
* This will enumerate all the cameras present in the system, which can then be
* listed with list() and retrieved with get().
*
* Cameras are shared through std::shared_ptr<>, ensuring that a camera will
* stay valid until the last reference is released without requiring any special
* action from the application. Once the application has released all the
* references it held to cameras, the camera manager can be stopped with
* stop().
*
* \todo Add interface to register a notification callback to the user to be
* able to inform it new cameras have been hot-plugged or cameras have been
* removed due to hot-unplug.
*/
CameraManager *CameraManager::self_ = nullptr;
CameraManager::CameraManager()
: enumerator_(nullptr)
{
if (self_)
LOG(Camera, Fatal)
<< "Multiple CameraManager objects are not allowed";
self_ = this;
}
CameraManager::~CameraManager()
{
self_ = nullptr;
}
/**
* \brief Start the camera manager
*
* Start the camera manager and enumerate all devices in the system. Once
* the start has been confirmed the user is free to list and otherwise
* interact with cameras in the system until either the camera manager
* is stopped or the camera is unplugged from the system.
*
* \return 0 on success or a negative error code otherwise
*/
int CameraManager::start()
{
if (enumerator_)
return -EBUSY;
LOG(Camera, Info) << "libcamera " << version_;
enumerator_ = DeviceEnumerator::create();
if (!enumerator_ || enumerator_->enumerate())
return -ENODEV;
/*
* TODO: Try to read handlers and order from configuration
* file and only fallback on all handlers if there is no
* configuration file.
*/
std::vector<PipelineHandlerFactory *> &factories = PipelineHandlerFactory::factories();
for (PipelineHandlerFactory *factory : factories) {
/*
* Try each pipeline handler until it exhaust
* all pipelines it can provide.
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