libcamera v0.4.0
Supporting cameras in Linux since 2019
 
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media_device.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2018, Google Inc.
4 *
5 * Media device handler
6 */
7
8#pragma once
9
10#include <map>
11#include <string>
12#include <vector>
13
14#include <linux/media.h>
15
16#include <libcamera/base/log.h>
19
21
22namespace libcamera {
23
24class MediaDevice : protected Loggable
25{
26public:
27 MediaDevice(const std::string &deviceNode);
29
30 bool acquire();
31 void release();
32 bool busy() const { return acquired_; }
33
34 bool lock();
35 void unlock();
36
37 int populate();
38 bool isValid() const { return valid_; }
39
40 const std::string &driver() const { return driver_; }
41 const std::string &deviceNode() const { return deviceNode_; }
42 const std::string &model() const { return model_; }
43 unsigned int version() const { return version_; }
44 unsigned int hwRevision() const { return hwRevision_; }
45
46 const std::vector<MediaEntity *> &entities() const { return entities_; }
47 MediaEntity *getEntityByName(const std::string &name) const;
48
49 MediaLink *link(const std::string &sourceName, unsigned int sourceIdx,
50 const std::string &sinkName, unsigned int sinkIdx);
51 MediaLink *link(const MediaEntity *source, unsigned int sourceIdx,
52 const MediaEntity *sink, unsigned int sinkIdx);
53 MediaLink *link(const MediaPad *source, const MediaPad *sink);
54 int disableLinks();
55
57
58protected:
59 std::string logPrefix() const override;
60
61private:
62 int open();
63 void close();
64
65 MediaObject *object(unsigned int id);
66 bool addObject(MediaObject *object);
67 void clear();
68
69 struct media_v2_interface *findInterface(const struct media_v2_topology &topology,
70 unsigned int entityId);
71 bool populateEntities(const struct media_v2_topology &topology);
72 bool populatePads(const struct media_v2_topology &topology);
73 bool populateLinks(const struct media_v2_topology &topology);
74 void fixupEntityFlags(struct media_v2_entity *entity);
75
76 friend int MediaLink::setEnabled(bool enable);
77 int setupLink(const MediaLink *link, unsigned int flags);
78
79 std::string driver_;
80 std::string deviceNode_;
81 std::string model_;
82 unsigned int version_;
83 unsigned int hwRevision_;
84
85 UniqueFD fd_;
86 bool valid_;
87 bool acquired_;
88
89 std::map<unsigned int, MediaObject *> objects_;
90 std::vector<MediaEntity *> entities_;
91};
92
93} /* namespace libcamera */
Base class to support log message extensions.
Definition log.h:91
bool acquire()
Claim a device for exclusive use.
Definition media_device.cpp:103
std::string logPrefix() const override
Retrieve a string to be prefixed to the log message.
Definition media_device.cpp:76
int disableLinks()
Disable all links in the media device.
Definition media_device.cpp:435
bool isValid() const
Query whether the media graph has been populated and is valid.
Definition media_device.h:38
const std::vector< MediaEntity * > & entities() const
Retrieve the list of entities in the media graph.
Definition media_device.h:46
bool busy() const
Check if a device is in use.
Definition media_device.h:32
void release()
Release a device previously claimed for exclusive use.
Definition media_device.cpp:119
const std::string & deviceNode() const
Retrieve the media device node path.
Definition media_device.h:41
int populate()
Populate the MediaDevice with device information and media objects.
Definition media_device.cpp:193
const std::string & driver() const
Retrieve the media device driver name.
Definition media_device.h:40
unsigned int hwRevision() const
Retrieve the media device hardware revision.
Definition media_device.h:44
bool lock()
Lock the device to prevent it from being used by other instances of libcamera.
Definition media_device.cpp:142
MediaLink * link(const std::string &sourceName, unsigned int sourceIdx, const std::string &sinkName, unsigned int sinkIdx)
Retrieve the MediaLink connecting two pads, identified by entity names and pad indexes.
Definition media_device.cpp:362
MediaDevice(const std::string &deviceNode)
Construct a MediaDevice.
Definition media_device.cpp:65
Signal disconnected
Signal emitted when the media device is disconnected from the system.
Definition media_device.h:56
MediaEntity * getEntityByName(const std::string &name) const
Return the MediaEntity with name name.
Definition media_device.cpp:334
const std::string & model() const
Retrieve the media device model name.
Definition media_device.h:42
unsigned int version() const
Retrieve the media device API version.
Definition media_device.h:43
void unlock()
Unlock the device and free it for use for libcamera instances.
Definition media_device.cpp:162
The MediaEntity represents an entity in the media graph.
Definition media_object.h:97
Base class for all media objects.
Definition media_object.h:24
The MediaPad represents a pad of an entity in the media graph.
Definition media_object.h:69
Generic signal and slot communication mechanism.
Definition signal.h:39
unique_ptr-like wrapper for a file descriptor
Definition unique_fd.h:18
Logging infrastructure.
Provides a class hierarchy that represents the media objects exposed by the Linux kernel Media Contro...
Top-level libcamera namespace.
Definition backtrace.h:17
Signal & slot implementation.
File descriptor wrapper that owns a file descriptor.