libcamera  v0.0.0+3695-a2c715d8
Supporting cameras in Linux since 2019
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.h - Pipeline handler infrastructure
6  */
7 
8 #pragma once
9 
10 #include <memory>
11 #include <queue>
12 #include <set>
13 #include <string>
14 #include <sys/types.h>
15 #include <vector>
16 
17 #include <libcamera/base/mutex.h>
18 #include <libcamera/base/object.h>
19 
20 #include <libcamera/controls.h>
21 #include <libcamera/stream.h>
22 
24 
25 namespace libcamera {
26 
27 class Camera;
28 class CameraConfiguration;
29 class CameraManager;
30 class DeviceEnumerator;
31 class DeviceMatch;
32 class FrameBuffer;
33 class MediaDevice;
34 class PipelineHandler;
35 class Request;
36 
37 class PipelineHandler : public std::enable_shared_from_this<PipelineHandler>,
38  public Object
39 {
40 public:
42  virtual ~PipelineHandler();
43 
44  virtual bool match(DeviceEnumerator *enumerator) = 0;
46  const DeviceMatch &dm);
47 
48  bool lock();
49  void unlock();
50 
52  const StreamRoles &roles) = 0;
53  virtual int configure(Camera *camera, CameraConfiguration *config) = 0;
54 
55  virtual int exportFrameBuffers(Camera *camera, Stream *stream,
56  std::vector<std::unique_ptr<FrameBuffer>> *buffers) = 0;
57 
58  virtual int start(Camera *camera, const ControlList *controls) = 0;
59  void stop(Camera *camera);
60  bool hasPendingRequests(const Camera *camera) const;
61 
62  void registerRequest(Request *request);
63  void queueRequest(Request *request);
64 
65  bool completeBuffer(Request *request, FrameBuffer *buffer);
66  void completeRequest(Request *request);
67 
68  const char *name() const { return name_; }
69 
70 protected:
71  void registerCamera(std::shared_ptr<Camera> camera);
72  void hotplugMediaDevice(MediaDevice *media);
73 
74  virtual int queueRequestDevice(Camera *camera, Request *request) = 0;
75  virtual void stopDevice(Camera *camera) = 0;
76 
78 
79 private:
80  void mediaDeviceDisconnected(MediaDevice *media);
81  virtual void disconnect();
82 
83  void doQueueRequest(Request *request);
84  void doQueueRequests();
85 
86  std::vector<std::shared_ptr<MediaDevice>> mediaDevices_;
87  std::vector<std::weak_ptr<Camera>> cameras_;
88 
89  std::queue<Request *> waitingRequests_;
90 
91  const char *name_;
92 
93  Mutex lock_;
94  bool lockOwner_ LIBCAMERA_TSA_GUARDED_BY(lock_); /* *Not* ownership of lock_ */
95 
96  friend class PipelineHandlerFactory;
97 };
98 
100 {
101 public:
102  PipelineHandlerFactory(const char *name);
103  virtual ~PipelineHandlerFactory() = default;
104 
105  std::shared_ptr<PipelineHandler> create(CameraManager *manager);
106 
107  const std::string &name() const { return name_; }
108 
109  static void registerType(PipelineHandlerFactory *factory);
110  static std::vector<PipelineHandlerFactory *> &factories();
111 
112 private:
113  virtual PipelineHandler *createInstance(CameraManager *manager) = 0;
114 
115  std::string name_;
116 };
117 
118 #define REGISTER_PIPELINE_HANDLER(handler) \
119 class handler##Factory final : public PipelineHandlerFactory \
120 { \
121 public: \
122  handler##Factory() : PipelineHandlerFactory(#handler) {} \
123  \
124 private: \
125  PipelineHandler *createInstance(CameraManager *manager) \
126  { \
127  return new handler(manager); \
128  } \
129 }; \
130 static handler##Factory global_##handler##Factory;
131 
132 } /* namespace libcamera */
virtual int queueRequestDevice(Camera *camera, Request *request)=0
Queue a request to the device.
The MediaDevice represents a Media Controller device with its full graph of connected objects...
Definition: media_device.h:25
std::mutex wrapper with clang thread safety annotation
Definition: mutex.h:119
std::vector< StreamRole > StreamRoles
A vector of StreamRole.
Definition: stream.h:71
void queueRequest(Request *request)
Queue a request.
Definition: pipeline_handler.cpp:380
bool hasPendingRequests(const Camera *camera) const
Determine if the camera has any requests pending.
Definition: pipeline_handler.cpp:335
Video stream for a camera.
Definition: stream.h:73
Top-level libcamera namespace.
Definition: backtrace.h:17
CameraManager * manager_
The Camera manager associated with the pipeline handler.
Definition: pipeline_handler.h:77
virtual void stopDevice(Camera *camera)=0
Stop capturing from all running streams.
PipelineHandler(CameraManager *manager)
Construct a PipelineHandler instance.
Definition: pipeline_handler.cpp:70
void registerRequest(Request *request)
Register a request for use by the pipeline handler.
Definition: pipeline_handler.cpp:348
Frame buffer data and its associated dynamic metadata.
Definition: framebuffer.h:49
bool completeBuffer(Request *request, FrameBuffer *buffer)
Complete a buffer for a request.
Definition: pipeline_handler.cpp:466
const std::string & name() const
Retrieve the factory name.
Definition: pipeline_handler.h:107
Video stream for a Camera.
Hold configuration for streams of the camera.
Definition: camera.h:32
virtual CameraConfiguration * generateConfiguration(Camera *camera, const StreamRoles &roles)=0
Generate a camera configuration for a specified camera.
IPA Proxy.
void hotplugMediaDevice(MediaDevice *media)
Enable hotplug handling for a media device.
Definition: pipeline_handler.cpp:554
virtual int start(Camera *camera, const ControlList *controls)=0
Start capturing from a group of streams.
A frame capture request.
Definition: request.h:30
Create and manage cameras based on a set of media devices.
Definition: pipeline_handler.h:37
Camera device.
Definition: camera.h:85
const char * name() const
Retrieve the pipeline handler name.
Definition: pipeline_handler.h:68
Description of a media device search pattern.
Definition: device_enumerator.h:20
bool lock()
Lock all media devices acquired by the pipeline.
Definition: pipeline_handler.cpp:157
Mutex classes with clang thread safety annotation.
MediaDevice * acquireMediaDevice(DeviceEnumerator *enumerator, const DeviceMatch &dm)
Search and acquire a MediaDevice matching a device pattern.
Definition: pipeline_handler.cpp:130
void stop(Camera *camera)
Stop capturing from all running streams and cancel pending requests.
Definition: pipeline_handler.cpp:298
Provide access and manage all cameras in the system.
Definition: camera_manager.h:23
Enumerate, store and search media devices.
Definition: device_enumerator.h:34
void registerCamera(std::shared_ptr< Camera > camera)
Register a camera to the camera manager and pipeline handler.
Definition: pipeline_handler.cpp:515
Base object to support automatic signal disconnection.
const ControlIdMap controls
List of all supported libcamera controls.
Definition: control_ids.cpp:1301
virtual int exportFrameBuffers(Camera *camera, Stream *stream, std::vector< std::unique_ptr< FrameBuffer >> *buffers)=0
Allocate and export buffers for stream.
void completeRequest(Request *request)
Signal request completion.
Definition: pipeline_handler.cpp:487
Associate a list of ControlId with their values for an object.
Definition: controls.h:348
Framework to manage controls related to an object.
virtual int configure(Camera *camera, CameraConfiguration *config)=0
Configure a group of streams for capture.
Base object to support automatic signal disconnection.
Definition: object.h:24
void unlock()
Unlock all media devices acquired by the pipeline.
Definition: pipeline_handler.cpp:187
Registration of PipelineHandler classes and creation of instances.
Definition: pipeline_handler.h:99
virtual bool match(DeviceEnumerator *enumerator)=0
Match media devices and create camera instances.