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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstDeviceProvider: GStreamer 1.0 Core Reference Manual</title>
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<link rel="prev" href="gstreamer-GstDevice.html" title="GstDevice">
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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Top  | 
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                  Description
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Home
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Up
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Prev
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Next
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GstDeviceProvider
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GstDeviceProvider — A device provider
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Functions
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gboolean
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gst_device_provider_can_monitor ()
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void
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gst_device_provider_class_add_metadata ()
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void
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gst_device_provider_class_add_static_metadata ()
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const gchar *
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gst_device_provider_class_get_metadata ()
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void
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gst_device_provider_class_set_metadata ()
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void
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gst_device_provider_class_set_static_metadata ()
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void
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gst_device_provider_device_add ()
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void
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gst_device_provider_device_remove ()
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GstBus *
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gst_device_provider_get_bus ()
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GList *
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gst_device_provider_get_devices ()
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GstDeviceProviderFactory *
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gst_device_provider_get_factory ()
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const gchar *
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gst_device_provider_get_metadata ()
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gboolean
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gst_device_provider_register ()
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gboolean
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gst_device_provider_start ()
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void
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gst_device_provider_stop ()
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Types and Values
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struct
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GstDeviceProvider
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struct
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GstDeviceProviderClass
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Includes
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#include <gst/gstprotection.h>
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Description
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A GstDeviceProvider subclass is provided by a plugin that handles devices
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if there is a way to programatically list connected devices. It can also
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optionally provide updates to the list of connected devices.
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Each GstDeviceProvider subclass is a singleton, a plugin should
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normally provide a single subclass for all devices.
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Applications would normally use a GstDeviceMonitor to monitor devices
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from all relevant providers.
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Functions
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gst_device_provider_can_monitor ()
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gboolean
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gst_device_provider_can_monitor (GstDeviceProvider *provider);
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gst_device_provider_class_add_metadata ()
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void
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gst_device_provider_class_add_metadata
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                               (GstDeviceProviderClass *klass,
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                                const gchar *key,
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                                const gchar *value);
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Set key
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 with value
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 as metadata in klass
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.
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Parameters
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klass
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class to set metadata for
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key
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the key to set
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value
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the value to set
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Since: 1.4
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gst_device_provider_class_add_static_metadata ()
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void
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gst_device_provider_class_add_static_metadata
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                               (GstDeviceProviderClass *klass,
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                                const gchar *key,
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                                const gchar *value);
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Set key
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 with value
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 as metadata in klass
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.
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Same as gst_device_provider_class_add_metadata(), but value
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 must be a static string
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or an inlined string, as it will not be copied. (GStreamer plugins will
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be made resident once loaded, so this function can be used even from
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dynamically loaded plugins.)
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Parameters
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klass
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class to set metadata for
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key
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the key to set
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value
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the value to set.
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[transfer full]
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Since: 1.4
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gst_device_provider_class_get_metadata ()
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const gchar *
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gst_device_provider_class_get_metadata
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                               (GstDeviceProviderClass *klass,
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                                const gchar *key);
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Get metadata with key
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 in klass
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.
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Parameters
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klass
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class to get metadata for
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key
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the key to get
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Returns
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the metadata for key
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.
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[nullable]
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Since: 1.4
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gst_device_provider_class_set_metadata ()
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void
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gst_device_provider_class_set_metadata
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                               (GstDeviceProviderClass *klass,
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                                const gchar *longname,
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                                const gchar *classification,
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                                const gchar *description,
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                                const gchar *author);
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Sets the detailed information for a GstDeviceProviderClass.
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This function is for use in _class_init functions only.
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Parameters
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klass
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class to set metadata for
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longname
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The long English name of the device provider. E.g. "File Sink"
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classification
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String describing the type of device provider, as an
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unordered list separated with slashes ('/'). See draft-klass.txt of the
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design docs
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for more details and common types. E.g: "Sink/File"
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description
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Sentence describing the purpose of the device provider.
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E.g: "Write stream to a file"
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author
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Name and contact details of the author(s). Use \n to separate
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multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"
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Since: 1.4
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gst_device_provider_class_set_static_metadata ()
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void
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gst_device_provider_class_set_static_metadata
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                               (GstDeviceProviderClass *klass,
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                                const gchar *longname,
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                                const gchar *classification,
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                                const gchar *description,
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                                const gchar *author);
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Sets the detailed information for a GstDeviceProviderClass.
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This function is for use in _class_init functions only.
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Same as gst_device_provider_class_set_metadata(), but longname
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, classification
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,
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description
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, and author
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 must be static strings or inlined strings, as
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they will not be copied. (GStreamer plugins will be made resident once
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loaded, so this function can be used even from dynamically loaded plugins.)
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Parameters
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klass
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class to set metadata for
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longname
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The long English name of the element. E.g. "File Sink".
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[transfer full]
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classification
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String describing the type of element, as
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an unordered list separated with slashes ('/'). See draft-klass.txt of the
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design docs for more details and common types. E.g: "Sink/File".
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[transfer full]
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description
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Sentence describing the purpose of the
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element.  E.g: "Write stream to a file".
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[transfer full]
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author
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Name and contact details of the author(s). Use \n
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to separate multiple author metadata. E.g: "Joe Bloggs <joe.blogs at
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foo.com>".
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[transfer full]
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Since: 1.4
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gst_device_provider_device_add ()
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void
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gst_device_provider_device_add (GstDeviceProvider *provider,
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                                GstDevice *device);
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Posts a message on the provider's GstBus to inform applications that
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a new device has been added.
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This is for use by subclasses.
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device
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's reference count will be incremented, and any floating reference
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will be removed (see gst_object_ref_sink()).
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Parameters
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provider
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a GstDeviceProvider
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device
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a GstDevice that has been added.
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[transfer floating]
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Since: 1.4
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gst_device_provider_device_remove ()
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void
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gst_device_provider_device_remove (GstDeviceProvider *provider,
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                                   GstDevice *device);
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Posts a message on the provider's GstBus to inform applications that
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a device has been removed.
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This is for use by subclasses.
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Parameters
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provider
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a GstDeviceProvider
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device
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a GstDevice that has been removed
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Since: 1.4
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gst_device_provider_get_bus ()
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GstBus *
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gst_device_provider_get_bus (GstDeviceProvider *provider);
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Gets the GstBus of this GstDeviceProvider
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Parameters
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provider
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a GstDeviceProvider
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Returns
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a GstBus.
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[transfer full]
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Since: 1.4
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gst_device_provider_get_devices ()
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GList *
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gst_device_provider_get_devices (GstDeviceProvider *provider);
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Gets a list of devices that this provider understands. This may actually
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probe the hardware if the provider is not currently started.
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Parameters
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provider
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A GstDeviceProvider
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Returns
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a GList of
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GstDevice.
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[transfer full][element-type GstDevice]
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Since: 1.4
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gst_device_provider_get_factory ()
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GstDeviceProviderFactory *
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gst_device_provider_get_factory (GstDeviceProvider *provider);
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Retrieves the factory that was used to create this device provider.
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Parameters
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provider
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a GstDeviceProvider to request the device provider factory of.
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Returns
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the GstDeviceProviderFactory used for
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creating this device provider. no refcounting is needed.
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[transfer none]
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Since: 1.4
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gst_device_provider_get_metadata ()
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const gchar *
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gst_device_provider_get_metadata (GstDeviceProvider *provider,
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                                  const gchar *key);
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Get metadata with key
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 in provider
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.
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Parameters
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provider
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provider to get metadata for
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key
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the key to get
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Returns
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 the metadata for key
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.
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Since: 1.14
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gst_device_provider_register ()
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gboolean
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gst_device_provider_register (GstPlugin *plugin,
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                              const gchar *name,
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                              guint rank,
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                              GType type);
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Create a new device providerfactory capable of instantiating objects of the
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type
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 and add the factory to plugin
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.
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Parameters
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plugin
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GstPlugin to register the device provider with, or NULL for
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a static device provider.
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[allow-none]
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name
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name of device providers of this type
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rank
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rank of device provider (higher rank means more importance when autoplugging)
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type
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GType of device provider to register
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Returns
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 TRUE, if the registering succeeded, FALSE on error
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Since: 1.4
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gst_device_provider_start ()
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gboolean
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gst_device_provider_start (GstDeviceProvider *provider);
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Starts providering the devices. This will cause GST_MESSAGE_DEVICE_ADDED
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and GST_MESSAGE_DEVICE_REMOVED messages to be posted on the provider's bus
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when devices are added or removed from the system.
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Since the GstDeviceProvider is a singleton,
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gst_device_provider_start() may already have been called by another
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user of the object, gst_device_provider_stop() needs to be called the same
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number of times.
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Parameters
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provider
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A GstDeviceProvider
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Returns
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 TRUE if the device providering could be started
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Since: 1.4
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gst_device_provider_stop ()
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void
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gst_device_provider_stop (GstDeviceProvider *provider);
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Decreases the use-count by one. If the use count reaches zero, this
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GstDeviceProvider will stop providering the devices. This needs to be
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called the same number of times that gst_device_provider_start() was called.
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Parameters
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provider
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A GstDeviceProvider
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Since: 1.4
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Types and Values
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struct GstDeviceProvider
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struct GstDeviceProvider {
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  GstObject         parent;
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  /* Protected by the Object lock */
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  GList *devices;
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};
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The structure of the base GstDeviceProvider
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Members
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GstObject parent;
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The parent GstObject
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GList *devices;
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a GList of the GstDevice objects
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Since: 1.4
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struct GstDeviceProviderClass
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struct GstDeviceProviderClass {
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  GstObjectClass    parent_class;
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  GstDeviceProviderFactory     *factory;
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  GList*      (*probe) (GstDeviceProvider * provider);
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  gboolean    (*start) (GstDeviceProvider * provider);
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  void        (*stop)  (GstDeviceProvider * provider);
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};
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The structure of the base GstDeviceProviderClass
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Members
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GstDeviceProviderFactory *factory;
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a pointer to the GstDeviceProviderFactory that creates this
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provider
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probe ()
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Returns a list of devices that are currently available.
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This should never block.
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start ()
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Starts monitoring for new devices. Only subclasses that can know
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that devices have been added or remove need to implement this method.
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stop ()
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Stops monitoring for new devices. Only subclasses that implement
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the start() method need to implement this method.
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Since: 1.4
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See Also
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GstDevice, GstDeviceMonitor
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