CheeseCameraDeviceMonitor

CheeseCameraDeviceMonitor — Simple object to enumerate v4l devices

Stability Level

Unstable, unless otherwise indicated

Synopsis

#include <cheese/cheese-camera-device-monitor.h>

struct              CheeseCameraDeviceMonitorClass;
struct              CheeseCameraDeviceMonitor;
CheeseCameraDeviceMonitor * cheese_camera_device_monitor_new
                                                        (void);
void                cheese_camera_device_monitor_coldplug
                                                        (CheeseCameraDeviceMonitor *monitor);

Object Hierarchy

  GObject
   +----CheeseCameraDeviceMonitor

Signals

  "added"                                          : Action
  "removed"                                        : Action

Description

CheeseCameraDeviceMonitor provides a basic interface for video4linux device enumeration and hotplugging.

It uses either GUdev or some platform specific code to list video devices. It is also capable (right now in Linux only, with the udev backend) to monitor device plugging and emit a CheeseCameraDeviceMonitor::added or CheeseCameraDeviceMonitor::removed signal when an event happens.

Details

struct CheeseCameraDeviceMonitorClass

struct CheeseCameraDeviceMonitorClass {
  void (*added)(CheeseCameraDeviceMonitor *monitor,
                CheeseCameraDevice        *device);
  void (*removed)(CheeseCameraDeviceMonitor *monitor, const gchar *uuid);
};

Class for CheeseCameraDeviceMonitor.

added ()

invoked when a new video capture device is connected

removed ()

invoked when a video capture device is removed

struct CheeseCameraDeviceMonitor

struct CheeseCameraDeviceMonitor;

Use the accessor functions below.


cheese_camera_device_monitor_new ()

CheeseCameraDeviceMonitor * cheese_camera_device_monitor_new
                                                        (void);

Returns a new CheeseCameraDeviceMonitor object.

Returns :

a new CheeseCameraDeviceMonitor object.

cheese_camera_device_monitor_coldplug ()

void                cheese_camera_device_monitor_coldplug
                                                        (CheeseCameraDeviceMonitor *monitor);

Enumerate plugged in cameras and emit ::added for those which already exist. This is only required when your program starts, so be sure to connect to at least the ::added signal before calling this function.

Signal Details

The "added" signal

void                user_function                      (CheeseCameraDeviceMonitor *monitor,
                                                        CheeseCameraDevice        *device,
                                                        gpointer                   user_data)      : Action

The ::added signal is emitted when a camera is added, or on start-up after cheese_camera_device_monitor_coldplug() is called.

monitor :

the CheeseCameraDeviceMonitor that emitted the signal

device :

a new CheeseCameraDevice representing the video capture device

user_data :

user data set when the signal handler was connected.

The "removed" signal

void                user_function                      (CheeseCameraDeviceMonitor *monitor,
                                                        gchar                     *uuid,
                                                        gpointer                   user_data)      : Action

The ::removed signal is emitted when a camera is unplugged, or disabled on the system.

monitor :

the CheeseCameraDeviceMonitor that emitted the signal

uuid :

UUID for the device on the system

user_data :

user data set when the signal handler was connected.