libcamera v0.5.1 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>
17#include <libcamera/base/signal.h>
18#include <libcamera/base/unique_fd.h>
19
20#include "libcamera/internal/media_object.h"
21
22 namespace libcamera {
23
24 class MediaDevice : protected Loggable
25{
26 public:
27 MediaDevice(const std::string &deviceNode);
28 ~MediaDevice();
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
56 Signal<> disconnected;
57
58 std::vector<MediaEntity *> locateEntities(unsigned int function);
59
60 protected:
61 std::string logPrefix() const override;
62
63 private:
64 int open();
65 void close();
66
67 MediaObject *object(unsigned int id);
68 bool addObject(MediaObject *object);
69 void clear();
70
71 struct media_v2_interface *findInterface(const struct media_v2_topology &topology,
72 unsigned int entityId);
73 bool populateEntities(const struct media_v2_topology &topology);
74 bool populatePads(const struct media_v2_topology &topology);
75 bool populateLinks(const struct media_v2_topology &topology);
76 void fixupEntityFlags(struct media_v2_entity *entity);
77
78 friend int MediaLink::setEnabled(bool enable);
79 int setupLink(const MediaLink *link, unsigned int flags);
80
81 std::string driver_;
82 std::string deviceNode_;
83 std::string model_;
84 unsigned int version_;
85 unsigned int hwRevision_;
86
87 UniqueFD fd_;
88 bool valid_;
89 bool acquired_;
90
91 std::map<unsigned int, MediaObject *> objects_;
92 std::vector<MediaEntity *> entities_;
93};
94
95} /* namespace libcamera */
libcamera::Loggable
Base class to support log message extensions.
Definition log.h:92
libcamera::MediaDevice::acquire
bool acquire()
Claim a device for exclusive use.
Definition media_device.cpp:104
libcamera::MediaDevice::logPrefix
std::string logPrefix() const override
Retrieve a string to be prefixed to the log message.
Definition media_device.cpp:77
libcamera::MediaDevice::disableLinks
int disableLinks()
Disable all links in the media device.
Definition media_device.cpp:436
libcamera::MediaDevice::isValid
bool isValid() const
Query whether the media graph has been populated and is valid.
Definition media_device.h:38
libcamera::MediaDevice::entities
const std::vector< MediaEntity * > & entities() const
Retrieve the list of entities in the media graph.
Definition media_device.h:46
libcamera::MediaDevice::busy
bool busy() const
Check if a device is in use.
Definition media_device.h:32
libcamera::MediaDevice::release
void release()
Release a device previously claimed for exclusive use.
Definition media_device.cpp:120
libcamera::MediaDevice::deviceNode
const std::string & deviceNode() const
Retrieve the media device node path.
Definition media_device.h:41
libcamera::MediaDevice::locateEntities
std::vector< MediaEntity * > locateEntities(unsigned int function)
Identify all entities of a common function in the MediaDevice.
Definition media_device.cpp:841
libcamera::MediaDevice::populate
int populate()
Populate the MediaDevice with device information and media objects.
Definition media_device.cpp:194
libcamera::MediaDevice::driver
const std::string & driver() const
Retrieve the media device driver name.
Definition media_device.h:40
libcamera::MediaDevice::hwRevision
unsigned int hwRevision() const
Retrieve the media device hardware revision.
Definition media_device.h:44
libcamera::MediaDevice::lock
bool lock()
Lock the device to prevent it from being used by other instances of libcamera.
Definition media_device.cpp:143
libcamera::MediaDevice::link
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:363
libcamera::MediaDevice::MediaDevice
MediaDevice(const std::string &deviceNode)
Construct a MediaDevice.
Definition media_device.cpp:66
libcamera::MediaDevice::disconnected
Signal disconnected
Signal emitted when the media device is disconnected from the system.
Definition media_device.h:56
libcamera::MediaDevice::getEntityByName
MediaEntity * getEntityByName(const std::string &name) const
Return the MediaEntity with name name.
Definition media_device.cpp:335
libcamera::MediaDevice::model
const std::string & model() const
Retrieve the media device model name.
Definition media_device.h:42
libcamera::MediaDevice::version
unsigned int version() const
Retrieve the media device API version.
Definition media_device.h:43
libcamera::MediaDevice::unlock
void unlock()
Unlock the device and free it for use for libcamera instances.
Definition media_device.cpp:163
libcamera::MediaEntity
The MediaEntity represents an entity in the media graph.
Definition media_object.h:97
libcamera::MediaLink
The MediaLink represents a link between two pads in the media graph.
Definition media_object.h:44
libcamera::MediaLink::setEnabled
int setEnabled(bool enable)
Enable or disable a link.
Definition media_object.cpp:122
libcamera::MediaObject
Base class for all media objects.
Definition media_object.h:24
libcamera::MediaPad
The MediaPad represents a pad of an entity in the media graph.
Definition media_object.h:69
libcamera::Signal
Generic signal and slot communication mechanism.
Definition signal.h:39
libcamera::UniqueFD
unique_ptr-like wrapper for a file descriptor
Definition unique_fd.h:17
log.h
Logging infrastructure.
media_object.h
Provides a class hierarchy that represents the media objects exposed by the Linux kernel Media Contro...
libcamera
Top-level libcamera namespace.
Definition backtrace.h:17
signal.h
Signal & slot implementation.
unique_fd.h
File descriptor wrapper that owns a file descriptor.