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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2018, Google Inc.
*
* pipeline_handler.cpp - Pipeline handler infrastructure
*/
#include "libcamera/internal/pipeline_handler.h"
#include <sys/sysmacros.h>
#include <libcamera/base/log.h>
#include <libcamera/base/utils.h>
#include <libcamera/buffer.h>
#include <libcamera/camera.h>
#include <libcamera/camera_manager.h>
#include "libcamera/internal/device_enumerator.h"
#include "libcamera/internal/media_device.h"
#include "libcamera/internal/tracepoints.h"
/**
* \file pipeline_handler.h
* \brief Create pipelines and cameras from a set of media devices
*
* Each pipeline supported by libcamera needs to be backed by a pipeline
* handler implementation that operate on a set of media devices. The pipeline
* handler is responsible for matching the media devices it requires with the
* devices present in the system, and once all those devices can be acquired,
* create corresponding Camera instances.
*
* Every subclass of PipelineHandler shall be registered with libcamera using
* the REGISTER_PIPELINE_HANDLER() macro.
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(Pipeline)
/**
* \class CameraData
* \brief Base class for platform-specific data associated with a camera
*
* The CameraData base abstract class represents platform specific-data
* a pipeline handler might want to associate with a Camera to access them
* at a later time.
*
* Pipeline handlers are expected to extend this base class with platform
* specific implementation, associate instances of the derived classes
* using the registerCamera() method, and access them at a later time
* with cameraData().
*/
/**
* \fn CameraData::CameraData(PipelineHandler *pipe)
* \brief Construct a CameraData instance for the given pipeline handler
* \param[in] pipe The pipeline handler
*
* The reference to the pipeline handler is stored internally, the caller shall
* guarantee that the pointer remains valid as long as the CameraData instance
* exists.
*/
/**
* \var CameraData::pipe_
* \brief The pipeline handler related to this CameraData instance
*
* The pipe_ pointer provides access to the PipelineHandler object that this
* instance is related to. It is set when the CameraData instance is created
* and remains valid until the instance is destroyed.
*/
/**
* \var CameraData::queuedRequests_
* \brief The list of queued and not yet completed request
*
* The list of queued request is used to track requests queued in order to
* ensure completion of all requests when the pipeline handler is stopped.
*
* \sa PipelineHandler::queueRequest(), PipelineHandler::stop(),
* PipelineHandler::completeRequest()
*/
/**
* \var CameraData::controlInfo_
* \brief The set of controls supported by the camera
*
* The control information shall be initialised by the pipeline handler when
* creating the camera, and shall not be modified afterwards.
*/
/**
* \var CameraData::properties_
* \brief The list of properties supported by the camera
*
* The list of camera properties shall be initialised by the pipeline handler
* when creating the camera, and shall not be modified afterwards.
*/
/**
* \var CameraData::requestSequence_
* \brief The queuing sequence of the request
*
* When requests are queued, they are given a per-camera sequence number to
* facilitate debugging of internal request usage.
*
* The requestSequence_ tracks the number of requests queued to a camera
* over its lifetime.
*/
/**
* \class PipelineHandler
* \brief Create and manage cameras based on a set of media devices
*
* The PipelineHandler matches the media devices provided by a DeviceEnumerator
* with the pipelines it supports and creates corresponding Camera devices.
*
* Pipeline handler instances are reference-counted through std::shared_ptr<>.
* They implement std::enable_shared_from_this<> in order to create new
* std::shared_ptr<> in code paths originating from member functions of the
* PipelineHandler class where only the 'this' pointer is available.
*/
/**
* \brief Construct a PipelineHandler instance
* \param[in] manager The camera manager
*
* In order to honour the std::enable_shared_from_this<> contract,
* PipelineHandler instances shall never be constructed manually, but always
* through the PipelineHandlerFactory::create() method implemented by the
* respective factories.
*/
PipelineHandler::PipelineHandler(CameraManager *manager)
: manager_(manager)
{
}
PipelineHandler::~PipelineHandler()
|