gstreamer/gst/gstdevice.c
2014-03-17 10:00:00 +01:00

329 lines
8.1 KiB
C

/* GStreamer
* Copyright (C) 2012 Olivier Crete <olivier.crete@collabora.com>
*
* gstdevice.c: Device discovery
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gst_private.h"
#include "gstdevice.h"
enum
{
PROP_DISPLAY_NAME = 1,
PROP_CAPS,
PROP_KLASS
};
enum
{
REMOVED,
LAST_SIGNAL
};
struct _GstDevicePrivate
{
GstCaps *caps;
gchar *klass;
gchar *display_name;
};
static guint signals[LAST_SIGNAL];
G_DEFINE_ABSTRACT_TYPE (GstDevice, gst_device, GST_TYPE_OBJECT);
static void gst_device_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec);
static void gst_device_set_property (GObject * object, guint property_id,
const GValue * value, GParamSpec * pspec);
static void gst_device_finalize (GObject * object);
static void
gst_device_class_init (GstDeviceClass * klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstDevicePrivate));
object_class->get_property = gst_device_get_property;
object_class->set_property = gst_device_set_property;
object_class->finalize = gst_device_finalize;
g_object_class_install_property (object_class, PROP_DISPLAY_NAME,
g_param_spec_string ("display-name", "Display Name",
"The user-friendly name of the device", "",
G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_CAPS,
g_param_spec_boxed ("caps", "Device Caps",
"The possible caps of a device", GST_TYPE_CAPS,
G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
g_object_class_install_property (object_class, PROP_KLASS,
g_param_spec_string ("klass", "Device Class",
"The Class of the device", "",
G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
signals[REMOVED] = g_signal_new ("removed", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0);
}
static void
gst_device_init (GstDevice * device)
{
device->priv = G_TYPE_INSTANCE_GET_PRIVATE (device, GST_TYPE_DEVICE,
GstDevicePrivate);
}
static void
gst_device_finalize (GObject * object)
{
GstDevice *device = GST_DEVICE (object);
gst_caps_replace (&device->priv->caps, NULL);
g_free (device->priv->display_name);
g_free (device->priv->klass);
G_OBJECT_CLASS (gst_device_parent_class)->finalize (object);
}
static void
gst_device_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDevice *gstdevice;
gstdevice = GST_DEVICE_CAST (object);
switch (prop_id) {
case PROP_DISPLAY_NAME:
g_value_take_string (value, gst_device_get_display_name (gstdevice));
break;
case PROP_CAPS:
if (gstdevice->priv->caps)
g_value_take_boxed (value, gst_device_get_caps (gstdevice));
break;
case PROP_KLASS:
g_value_take_string (value, gst_device_get_klass (gstdevice));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_device_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDevice *gstdevice;
gstdevice = GST_DEVICE_CAST (object);
switch (prop_id) {
case PROP_DISPLAY_NAME:
gstdevice->priv->display_name = g_value_dup_string (value);
break;
case PROP_CAPS:
gst_caps_replace (&gstdevice->priv->caps, g_value_get_boxed (value));
break;
case PROP_KLASS:
gstdevice->priv->klass = g_value_dup_string (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
/**
* gst_device_create_element:
* @device: a #GstDevice
* @name: (allow-none): name of new element, or NULL to automatically
* create a unique name.
*
* Returns: (transfer full): a new #GstElement configured to use this device
*
* Since: 1.4
*/
GstElement *
gst_device_create_element (GstDevice * device, const gchar * name)
{
GstDeviceClass *klass = GST_DEVICE_GET_CLASS (device);
if (klass->create_element)
return klass->create_element (device, name);
else
return NULL;
}
/**
* gst_device_get_caps:
* @device: a #GstDevice
*
* Getter for the #GstCaps that this device supports.
*
* Returns: The #GstCaps supported by this device. Unref with
* gst_caps_unref() when done.
*
* Since: 1.4
*/
GstCaps *
gst_device_get_caps (GstDevice * device)
{
if (device->priv->caps)
return gst_caps_ref (device->priv->caps);
else
return NULL;
}
/**
* gst_device_get_display_name:
* @device: a #GstDevice
*
* Gets the user-friendly name of the device.
*
* Returns: The device name. Free with g_free() after use.
*
* Since: 1.4
*/
gchar *
gst_device_get_display_name (GstDevice * device)
{
return
g_strdup (device->priv->display_name ? device->priv->display_name : "");
}
/**
* gst_device_get_klass:
* @device: a #GstDevice
*
* Gets the "class" of a device. This is a "/" separated list of
* classes that represent this device. They are a subset of the
* classes of the #GstDeviceMonitor that produced this device.
*
* Returns: The device class. Free with g_free() after use.
*
* Since: 1.4
*/
gchar *
gst_device_get_klass (GstDevice * device)
{
return g_strdup (device->priv->klass ? device->priv->klass : "");
}
/**
* gst_device_reconfigure_element:
* @device: a #GstDevice
* @element: a #GstElement
*
* Tries to reconfigure an existing element to use the device. If this
* function fails, then one must destroy the element and create a new one
* using gst_device_create_element().
*
* Note: This should only be implemented for elements can change their
* device in the PLAYING state.
*
* Returns: %TRUE if the element could be reconfigured to use this device,
* %FALSE otherwise.
*
* Since: 1.4
*/
gboolean
gst_device_reconfigure_element (GstDevice * device, GstElement * element)
{
GstDeviceClass *klass = GST_DEVICE_GET_CLASS (device);
if (klass->reconfigure_element)
return klass->reconfigure_element (device, element);
else
return FALSE;
}
/**
* gst_device_has_classesv:
* @device: a #GstDevice
* @classes: a %NULL terminated array of klasses to match, only match if all
* classes are matched
*
* Check if @factory matches all of the given classes
*
* Returns: %TRUE if @device matches.
*
* Since: 1.4
*/
gboolean
gst_device_has_classesv (GstDevice * device, gchar ** classes)
{
g_return_val_if_fail (GST_IS_DEVICE (device), FALSE);
for (; classes[0]; classes++) {
const gchar *found;
guint len;
if (classes[0] == '\0')
continue;
found = strstr (device->priv->klass, classes[0]);
if (!found)
return FALSE;
if (found != device->priv->klass && *(found - 1) != '/')
return FALSE;
len = strlen (classes[0]);
if (found[len] != 0 && found[len] != '/')
return FALSE;
}
return TRUE;
}
/**
* gst_device_has_classes:
* @device: a #GstDevice
* @classes: a "/" separate list of klasses to match, only match if all classes
* are matched
*
* Check if @device matches all of the given classes
*
* Returns: %TRUE if @device matches.
*
* Since: 1.4
*/
gboolean
gst_device_has_classes (GstDevice * device, const gchar * classes)
{
gchar **classesv;
gboolean res;
classesv = g_strsplit (classes, "/", 0);
res = gst_device_has_classesv (device, classesv);
g_strfreev (classesv);
return res;
}