libcamera v0.4.0
Supporting cameras in Linux since 2019
 
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pipeline_handler.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2018, Google Inc.
4 *
5 * Pipeline handler infrastructure
6 */
7
8#pragma once
9
10#include <memory>
11#include <queue>
12#include <string>
13#include <sys/types.h>
14#include <vector>
15
17
18#include <libcamera/controls.h>
19#include <libcamera/stream.h>
20
21namespace libcamera {
22
23class Camera;
25class CameraManager;
27class DeviceMatch;
28class FrameBuffer;
29class MediaDevice;
30class PipelineHandler;
31class Request;
32
33class PipelineHandler : public std::enable_shared_from_this<PipelineHandler>,
34 public Object
35{
36public:
38 virtual ~PipelineHandler();
39
40 virtual bool match(DeviceEnumerator *enumerator) = 0;
42 const DeviceMatch &dm);
43
44 bool acquire(Camera *camera);
45 void release(Camera *camera);
46
47 virtual std::unique_ptr<CameraConfiguration> generateConfiguration(Camera *camera,
48 Span<const StreamRole> roles) = 0;
49 virtual int configure(Camera *camera, CameraConfiguration *config) = 0;
50
51 virtual int exportFrameBuffers(Camera *camera, Stream *stream,
52 std::vector<std::unique_ptr<FrameBuffer>> *buffers) = 0;
53
54 virtual int start(Camera *camera, const ControlList *controls) = 0;
55 void stop(Camera *camera);
56 bool hasPendingRequests(const Camera *camera) const;
57
58 void registerRequest(Request *request);
59 void queueRequest(Request *request);
60
61 bool completeBuffer(Request *request, FrameBuffer *buffer);
62 void completeRequest(Request *request);
63 void cancelRequest(Request *request);
64
65 std::string configurationFile(const std::string &subdir,
66 const std::string &name) const;
67
68 const char *name() const { return name_; }
69
71
72protected:
73 void registerCamera(std::shared_ptr<Camera> camera);
75
76 virtual int queueRequestDevice(Camera *camera, Request *request) = 0;
77 virtual void stopDevice(Camera *camera) = 0;
78
79 virtual bool acquireDevice(Camera *camera);
80 virtual void releaseDevice(Camera *camera);
81
83
84private:
85 void unlockMediaDevices();
86
87 void mediaDeviceDisconnected(MediaDevice *media);
88 virtual void disconnect();
89
90 void doQueueRequest(Request *request);
91 void doQueueRequests();
92
93 std::vector<std::shared_ptr<MediaDevice>> mediaDevices_;
94 std::vector<std::weak_ptr<Camera>> cameras_;
95
96 std::queue<Request *> waitingRequests_;
97
98 const char *name_;
99 unsigned int useCount_;
100
101 friend class PipelineHandlerFactoryBase;
102};
103
105{
106public:
107 PipelineHandlerFactoryBase(const char *name);
108 virtual ~PipelineHandlerFactoryBase() = default;
109
110 std::shared_ptr<PipelineHandler> create(CameraManager *manager) const;
111
112 const std::string &name() const { return name_; }
113
114 static std::vector<PipelineHandlerFactoryBase *> &factories();
115 static const PipelineHandlerFactoryBase *getFactoryByName(const std::string &name);
116
117private:
118 static void registerType(PipelineHandlerFactoryBase *factory);
119
120 virtual std::unique_ptr<PipelineHandler>
121 createInstance(CameraManager *manager) const = 0;
122
123 std::string name_;
124};
125
126template<typename _PipelineHandler>
128{
129public:
134
135 std::unique_ptr<PipelineHandler>
136 createInstance(CameraManager *manager) const override
137 {
138 return std::make_unique<_PipelineHandler>(manager);
139 }
140};
141
142#define REGISTER_PIPELINE_HANDLER(handler, name) \
143 static PipelineHandlerFactory<handler> global_##handler##Factory(name);
144
145} /* namespace libcamera */
Hold configuration for streams of the camera.
Definition camera.h:60
Provide access and manage all cameras in the system.
Definition camera_manager.h:24
Camera device.
Definition camera.h:115
Associate a list of ControlId with their values for an object.
Definition controls.h:411
Enumerate, store and search media devices.
Definition device_enumerator.h:35
Description of a media device search pattern.
Definition device_enumerator.h:21
Frame buffer data and its associated dynamic metadata.
Definition framebuffer.h:49
The MediaDevice represents a Media Controller device with its full graph of connected objects.
Definition media_device.h:25
Object(Object *parent=nullptr)
Construct an Object instance.
Definition object.cpp:69
Base class for pipeline handler factories.
Definition pipeline_handler.h:105
const std::string & name() const
Retrieve the factory name.
Definition pipeline_handler.h:112
static const PipelineHandlerFactoryBase * getFactoryByName(const std::string &name)
Return the factory for the pipeline handler with name name.
Definition pipeline_handler.cpp:855
PipelineHandlerFactoryBase(const char *name)
Construct a pipeline handler factory base.
Definition pipeline_handler.cpp:794
static std::vector< PipelineHandlerFactoryBase * > & factories()
Retrieve the list of all pipeline handler factories.
Definition pipeline_handler.cpp:839
std::shared_ptr< PipelineHandler > create(CameraManager *manager) const
Create an instance of the PipelineHandler corresponding to the factory.
Definition pipeline_handler.cpp:807
PipelineHandlerFactory(const char *name)
Construct a pipeline handler factory.
Definition pipeline_handler.h:130
std::unique_ptr< PipelineHandler > createInstance(CameraManager *manager) const override
Create an instance of the PipelineHandler corresponding to the factory.
Definition pipeline_handler.h:136
Create and manage cameras based on a set of media devices.
Definition pipeline_handler.h:35
virtual void stopDevice(Camera *camera)=0
Stop capturing from all running streams.
CameraManager * cameraManager() const
Retrieve the CameraManager that this pipeline handler belongs to.
Definition pipeline_handler.h:70
void hotplugMediaDevice(MediaDevice *media)
Enable hotplug handling for a media device.
Definition pipeline_handler.cpp:696
const char * name() const
Retrieve the pipeline handler name.
Definition pipeline_handler.h:68
CameraManager * manager_
The Camera manager associated with the pipeline handler.
Definition pipeline_handler.h:82
PipelineHandler(CameraManager *manager)
Construct a PipelineHandler instance.
Definition pipeline_handler.cpp:70
void completeRequest(Request *request)
Signal request completion.
Definition pipeline_handler.cpp:548
virtual void releaseDevice(Camera *camera)
Release resources associated with this camera.
Definition pipeline_handler.cpp:254
virtual int queueRequestDevice(Camera *camera, Request *request)=0
Queue a request to the device.
bool acquire(Camera *camera)
Acquire exclusive access to the pipeline handler for the process.
Definition pipeline_handler.cpp:165
std::string configurationFile(const std::string &subdir, const std::string &name) const
Retrieve the absolute path to a platform configuration file.
Definition pipeline_handler.cpp:598
virtual bool acquireDevice(Camera *camera)
Acquire resources associated with this camera.
Definition pipeline_handler.cpp:233
virtual bool match(DeviceEnumerator *enumerator)=0
Match media devices and create camera instances.
MediaDevice * acquireMediaDevice(DeviceEnumerator *enumerator, const DeviceMatch &dm)
Search and acquire a MediaDevice matching a device pattern.
Definition pipeline_handler.cpp:130
void registerCamera(std::shared_ptr< Camera > camera)
Register a camera to the camera manager and pipeline handler.
Definition pipeline_handler.cpp:645
void registerRequest(Request *request)
Register a request for use by the pipeline handler.
Definition pipeline_handler.cpp:411
virtual int start(Camera *camera, const ControlList *controls)=0
Start capturing from a group of streams.
void cancelRequest(Request *request)
Cancel request and signal its completion.
Definition pipeline_handler.cpp:574
void queueRequest(Request *request)
Queue a request.
Definition pipeline_handler.cpp:443
bool hasPendingRequests(const Camera *camera) const
Determine if the camera has any requests pending.
Definition pipeline_handler.cpp:398
void stop(Camera *camera)
Stop capturing from all running streams and cancel pending requests.
Definition pipeline_handler.cpp:361
virtual int exportFrameBuffers(Camera *camera, Stream *stream, std::vector< std::unique_ptr< FrameBuffer > > *buffers)=0
Allocate and export buffers for stream.
virtual std::unique_ptr< CameraConfiguration > generateConfiguration(Camera *camera, Span< const StreamRole > roles)=0
Generate a camera configuration for a specified camera.
bool completeBuffer(Request *request, FrameBuffer *buffer)
Complete a buffer for a request.
Definition pipeline_handler.cpp:527
virtual int configure(Camera *camera, CameraConfiguration *config)=0
Configure a group of streams for capture.
void release(Camera *camera)
Release exclusive access to the pipeline handler.
Definition pipeline_handler.cpp:203
A frame capture request.
Definition request.h:30
Video stream for a camera.
Definition stream.h:76
Framework to manage controls related to an object.
Namespace for libcamera controls.
Definition control_ids.h:21
Top-level libcamera namespace.
Definition backtrace.h:17
Base object to support automatic signal disconnection.
Video stream for a Camera.