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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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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="index.html" title="GStreamer 1.0 Core Reference Manual">
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<link rel="up" href="gstreamer-device-probing.html" title="GStreamer Device Discovery and Device Probing">
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<link rel="prev" href="gstreamer-GstDevice.html" title="GstDevice">
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<link rel="next" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory">
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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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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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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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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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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
|
|
Packit |
f546b1 |
Name and contact details of the author(s). Use \n to separate
|
|
Packit |
f546b1 |
multiple author metadata. E.g: "Joe Bloggs <joe.blogs at foo.com>"
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_class_set_static_metadata ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_device_provider_class_set_static_metadata
|
|
Packit |
f546b1 |
(GstDeviceProviderClass *klass,
|
|
Packit |
f546b1 |
const gchar *longname,
|
|
Packit |
f546b1 |
const gchar *classification,
|
|
Packit |
f546b1 |
const gchar *description,
|
|
Packit |
f546b1 |
const gchar *author);
|
|
Packit |
f546b1 |
Sets the detailed information for a GstDeviceProviderClass.
|
|
Packit |
f546b1 |
This function is for use in _class_init functions only.
|
|
Packit |
f546b1 |
Same as gst_device_provider_class_set_metadata(), but longname
|
|
Packit |
f546b1 |
, classification
|
|
Packit |
f546b1 |
,
|
|
Packit |
f546b1 |
description
|
|
Packit |
f546b1 |
, and author
|
|
Packit |
f546b1 |
must be static strings or inlined strings, as
|
|
Packit |
f546b1 |
they will not be copied. (GStreamer plugins will be made resident once
|
|
Packit |
f546b1 |
loaded, so this function can be used even from dynamically loaded plugins.)
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
klass
|
|
Packit |
f546b1 |
class to set metadata for
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
longname
|
|
Packit |
f546b1 |
The long English name of the element. E.g. "File Sink".
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
classification
|
|
Packit |
f546b1 |
String describing the type of element, as
|
|
Packit |
f546b1 |
an unordered list separated with slashes ('/'). See draft-klass.txt of the
|
|
Packit |
f546b1 |
design docs for more details and common types. E.g: "Sink/File".
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
description
|
|
Packit |
f546b1 |
Sentence describing the purpose of the
|
|
Packit |
f546b1 |
element. E.g: "Write stream to a file".
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
author
|
|
Packit |
f546b1 |
Name and contact details of the author(s). Use \n
|
|
Packit |
f546b1 |
to separate multiple author metadata. E.g: "Joe Bloggs <joe.blogs at
|
|
Packit |
f546b1 |
foo.com>".
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_device_add ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_device_provider_device_add (GstDeviceProvider *provider,
|
|
Packit |
f546b1 |
GstDevice *device);
|
|
Packit |
f546b1 |
Posts a message on the provider's GstBus to inform applications that
|
|
Packit |
f546b1 |
a new device has been added.
|
|
Packit |
f546b1 |
This is for use by subclasses.
|
|
Packit |
f546b1 |
device
|
|
Packit |
f546b1 |
's reference count will be incremented, and any floating reference
|
|
Packit |
f546b1 |
will be removed (see gst_object_ref_sink()).
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
a GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
device
|
|
Packit |
f546b1 |
a GstDevice that has been added.
|
|
Packit |
f546b1 |
[transfer floating]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_device_remove ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_device_provider_device_remove (GstDeviceProvider *provider,
|
|
Packit |
f546b1 |
GstDevice *device);
|
|
Packit |
f546b1 |
Posts a message on the provider's GstBus to inform applications that
|
|
Packit |
f546b1 |
a device has been removed.
|
|
Packit |
f546b1 |
This is for use by subclasses.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
a GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
device
|
|
Packit |
f546b1 |
a GstDevice that has been removed
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_get_bus ()
|
|
Packit |
f546b1 |
GstBus *
|
|
Packit |
f546b1 |
gst_device_provider_get_bus (GstDeviceProvider *provider);
|
|
Packit |
f546b1 |
Gets the GstBus of this GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
a GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a GstBus.
|
|
Packit |
f546b1 |
[transfer full]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_get_devices ()
|
|
Packit |
f546b1 |
GList *
|
|
Packit |
f546b1 |
gst_device_provider_get_devices (GstDeviceProvider *provider);
|
|
Packit |
f546b1 |
Gets a list of devices that this provider understands. This may actually
|
|
Packit |
f546b1 |
probe the hardware if the provider is not currently started.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
A GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
a GList of
|
|
Packit |
f546b1 |
GstDevice.
|
|
Packit |
f546b1 |
[transfer full][element-type GstDevice]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_get_factory ()
|
|
Packit |
f546b1 |
GstDeviceProviderFactory *
|
|
Packit |
f546b1 |
gst_device_provider_get_factory (GstDeviceProvider *provider);
|
|
Packit |
f546b1 |
Retrieves the factory that was used to create this device provider.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
a GstDeviceProvider to request the device provider factory of.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
the GstDeviceProviderFactory used for
|
|
Packit |
f546b1 |
creating this device provider. no refcounting is needed.
|
|
Packit |
f546b1 |
[transfer none]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_get_metadata ()
|
|
Packit |
f546b1 |
const gchar *
|
|
Packit |
f546b1 |
gst_device_provider_get_metadata (GstDeviceProvider *provider,
|
|
Packit |
f546b1 |
const gchar *key);
|
|
Packit |
f546b1 |
Get metadata with key
|
|
Packit |
f546b1 |
in provider
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
provider to get metadata for
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
key
|
|
Packit |
f546b1 |
the key to get
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
the metadata for key
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.14
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_register ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_device_provider_register (GstPlugin *plugin,
|
|
Packit |
f546b1 |
const gchar *name,
|
|
Packit |
f546b1 |
guint rank,
|
|
Packit |
f546b1 |
GType type);
|
|
Packit |
f546b1 |
Create a new device providerfactory capable of instantiating objects of the
|
|
Packit |
f546b1 |
type
|
|
Packit |
f546b1 |
and add the factory to plugin
|
|
Packit |
f546b1 |
.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
plugin
|
|
Packit |
f546b1 |
GstPlugin to register the device provider with, or NULL for
|
|
Packit |
f546b1 |
a static device provider.
|
|
Packit |
f546b1 |
[allow-none]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
name
|
|
Packit |
f546b1 |
name of device providers of this type
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
rank
|
|
Packit |
f546b1 |
rank of device provider (higher rank means more importance when autoplugging)
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
type
|
|
Packit |
f546b1 |
GType of device provider to register
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE, if the registering succeeded, FALSE on error
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_start ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_device_provider_start (GstDeviceProvider *provider);
|
|
Packit |
f546b1 |
Starts providering the devices. This will cause GST_MESSAGE_DEVICE_ADDED
|
|
Packit |
f546b1 |
and GST_MESSAGE_DEVICE_REMOVED messages to be posted on the provider's bus
|
|
Packit |
f546b1 |
when devices are added or removed from the system.
|
|
Packit |
f546b1 |
Since the GstDeviceProvider is a singleton,
|
|
Packit |
f546b1 |
gst_device_provider_start() may already have been called by another
|
|
Packit |
f546b1 |
user of the object, gst_device_provider_stop() needs to be called the same
|
|
Packit |
f546b1 |
number of times.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
provider
|
|
Packit |
f546b1 |
A GstDeviceProvider
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if the device providering could be started
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.4
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_device_provider_stop ()
|
|
Packit |
f546b1 |
void
|
|
Packit |
f546b1 |
gst_device_provider_stop (GstDeviceProvider *provider);
|
|
Packit |
f546b1 |
Decreases the use-count by one. If the use count reaches zero, this
|
|
Packit |
f546b1 |
GstDeviceProvider will stop providering the devices. This needs to be
|
|
Packit |
f546b1 |
called the same number of times that gst_device_provider_start() was called.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
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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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Generated by GTK-Doc V1.27
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</body>
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</html>
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