From 1c4f1563326ed1d9596a330ac750ee0decbd702f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= Date: Thu, 20 Dec 2018 01:34:49 +0100 Subject: libcamera: camera_manager: add CameraManager class MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Provide a CameraManager class which will handle listing, instancing, destruction and lifetime management of cameras. Signed-off-by: Niklas Söderlund Reviewed-by: Jacopo Mondi Reviewed-by: Laurent Pinchart --- src/libcamera/camera_manager.cpp | 164 +++++++++++++++++++++++++++++++++++++++ src/libcamera/meson.build | 1 + 2 files changed, 165 insertions(+) create mode 100644 src/libcamera/camera_manager.cpp (limited to 'src') diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp new file mode 100644 index 00000000..50a805fc --- /dev/null +++ b/src/libcamera/camera_manager.cpp @@ -0,0 +1,164 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/* + * Copyright (C) 2018, Google Inc. + * + * camera_manager.h - Camera management + */ + +#include + +#include "device_enumerator.h" +#include "pipeline_handler.h" + +/** + * \file camera_manager.h + * \brief Manage all cameras handled by libcamera + * + * The responsibility of the camera manager is to control the lifetime + * management of objects provided by libcamera. + * + * When a user wish to interact with libcamera it creates and starts a + * CameraManager object. Once confirmed the camera manager is running + * the application can list all cameras detected by the library, get + * one or more of the cameras and interact with them. + * + * When the user is done with the camera it should be returned to the + * camera manager. Once all cameras are returned to the camera manager + * the user is free to stop the manager. + * + * \todo Add ability to add and remove media devices based on + * hot-(un)plug events coming from the device enumerator. + * + * \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. + */ + +namespace libcamera { + +CameraManager::CameraManager() + : enumerator_(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 true on successful start false otherwise + */ +int CameraManager::start() +{ + + if (enumerator_) + return -ENODEV; + + enumerator_ = DeviceEnumerator::create(); + if (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 handlers = PipelineHandlerFactory::handlers(); + + for (std::string const &handler : handlers) { + PipelineHandler *pipe; + + /* + * Try each pipeline handler until it exhaust + * all pipelines it can provide. + */ + do { + pipe = PipelineHandlerFactory::create(handler, enumerator_); + if (pipe) + pipes_.push_back(pipe); + } while (pipe); + } + + /* TODO: register hot-plug callback here */ + + return 0; +} + +/** + * \brief Stop the camera manager + * + * Before stopping the camera manger the caller is responsible for making + * sure all cameras provided by the manager are returned to the manager. + * + * After the manager has been stopped no resource provided by the camera + * manager should be consider valid or functional even if they for one + * reason or another have yet to be deleted. + */ +void CameraManager::stop() +{ + /* TODO: unregister hot-plug callback here */ + + for (PipelineHandler *pipe : pipes_) + delete pipe; + + pipes_.clear(); + + if (enumerator_) + delete enumerator_; + + enumerator_ = nullptr; +} + +/** + * \brief List all detected cameras + * + * Before calling this function the caller is responsible for ensuring that + * the camera manger is running. + * + * \return List of names for all detected cameras + */ +std::vector CameraManager::list() const +{ + std::vector list; + + for (PipelineHandler *pipe : pipes_) { + for (unsigned int i = 0; i < pipe->count(); i++) { + Camera *cam = pipe->camera(i); + list.push_back(cam->name()); + } + } + + return list; +} + +/** + * \brief Get a camera based on name + * + * \param[in] name Name of camera to get + * + * Before calling this function the caller is responsible for ensuring that + * the camera manger is running. A camera fetched this way shall be + * released by the user with the put() method of the Camera object once + * it is done using the camera. + * + * \return Pointer to Camera object or nullptr if camera not found + */ +Camera *CameraManager::get(const std::string &name) +{ + for (PipelineHandler *pipe : pipes_) { + for (unsigned int i = 0; i < pipe->count(); i++) { + Camera *cam = pipe->camera(i); + if (cam->name() == name) { + cam->get(); + return cam; + } + } + } + + return nullptr; +} + +} /* namespace libcamera */ diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build index 0db648dd..a8cb3fdc 100644 --- a/src/libcamera/meson.build +++ b/src/libcamera/meson.build @@ -1,5 +1,6 @@ libcamera_sources = files([ 'camera.cpp', + 'camera_manager.cpp', 'device_enumerator.cpp', 'log.cpp', 'main.cpp', -- cgit v1.2.1