Struct gstreamer::DeviceMonitor

pub struct DeviceMonitor(_, _);

Applications should create a DeviceMonitor when they want to probe, list and monitor devices of a specific type. The DeviceMonitor will create the appropriate DeviceProvider objects and manage them. It will then post messages on its Bus for devices that have been added and removed.

The device monitor will monitor all devices matching the filters that the application has set.

The basic use pattern of a device monitor is as follows:

  static gboolean
  my_bus_func (GstBus * bus, GstMessage * message, gpointer user_data)
  {
     GstDevice *device;
     gchar *name;

     switch (GST_MESSAGE_TYPE (message)) {
       case GST_MESSAGE_DEVICE_ADDED:
         gst_message_parse_device_added (message, &device);
         name = gst_device_get_display_name (device);
         g_print("Device added: %s\n", name);
         g_free (name);
         gst_object_unref (device);
         break;
       case GST_MESSAGE_DEVICE_REMOVED:
         gst_message_parse_device_removed (message, &device);
         name = gst_device_get_display_name (device);
         g_print("Device removed: %s\n", name);
         g_free (name);
         gst_object_unref (device);
         break;
       default:
         break;
     }

     return G_SOURCE_CONTINUE;
  }

  GstDeviceMonitor *
  setup_raw_video_source_device_monitor (void) {
     GstDeviceMonitor *monitor;
     GstBus *bus;
     GstCaps *caps;

     monitor = gst_device_monitor_new ();

     bus = gst_device_monitor_get_bus (monitor);
     gst_bus_add_watch (bus, my_bus_func, NULL);
     gst_object_unref (bus);

     caps = gst_caps_new_empty_simple ("video/x-raw");
     gst_device_monitor_add_filter (monitor, "Video/Source", caps);
     gst_caps_unref (caps);

     gst_device_monitor_start (monitor);

     return monitor;
  }

Implements

DeviceMonitorExt, GstObjectExt, glib::object::ObjectExt, DeviceMonitorExtManual

Implementations

impl DeviceMonitor

pub fn new() -> DeviceMonitor

Create a new DeviceMonitor

Returns

a new device monitor.

Trait Implementations

impl Clone for DeviceMonitor

fn clone(&self) -> DeviceMonitor

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DeviceMonitor

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DeviceMonitor

fn default() -> Self

Returns the "default value" for a type.

impl Eq for DeviceMonitor

impl Hash for DeviceMonitor

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl IsA<Object> for DeviceMonitor

impl Ord for DeviceMonitor

fn cmp(&self, other: &DeviceMonitor) -> Ordering

This method returns an Ordering between self and other.

#[must_use]fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

#[must_use]fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

#[must_use]fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl<T: ObjectType> PartialEq<T> for DeviceMonitor

fn eq(&self, other: &T) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T: ObjectType> PartialOrd<T> for DeviceMonitor

fn partial_cmp(&self, other: &T) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Send for DeviceMonitor

impl StaticType for DeviceMonitor

fn static_type() -> Type

Returns the type identifier of Self.

impl Sync for DeviceMonitor