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GStreamer Buzztard Reference Manual | ![]() |
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Top | Description |
gchar ** gst_preset_get_preset_names (GstPreset *self
); gboolean gst_preset_load_preset (GstPreset *self
,const gchar *name
); gboolean gst_preset_save_preset (GstPreset *self
,const gchar *name
); gboolean gst_preset_rename_preset (GstPreset *self
,const gchar *old_name
,const gchar *new_name
); gboolean gst_preset_delete_preset (GstPreset *self
,const gchar *name
); gboolean gst_preset_set_meta (GstPreset *self
,const gchar *name
,const gchar *tag
,const gchar *value
); gboolean gst_preset_get_meta (GstPreset *self
,const gchar *name
,const gchar *tag
,gchar **value
);
This interface offers methods to query and manipulate parameter preset sets. A preset is a bunch of property settings, together with meta data and a name. The name of a preset serves as key for subsequent method calls to manipulate single presets. All instances of one type will share the list of presets. The list is created on demand, if presets are not used, the list is not created.
The interface comes with a default implementation that serves most plugins.
Wrapper plugins will override most methods to implement support for the
native preset format of those wrapped plugins.
One method that is useful to be overridden is gst_preset_get_property_names()
.
With that one can control which properties are saved and in which order.
gchar ** gst_preset_get_preset_names (GstPreset *self
);
Get a copy of preset names as a NULL terminated string array. Free with
g_strfreev()
wen done.
|
a GObject that implements GstPreset |
Returns : |
list with names |
gboolean gst_preset_load_preset (GstPreset *self
,const gchar *name
);
Load the given preset.
|
a GObject that implements GstPreset |
|
preset name to load |
Returns : |
TRUE for success, FALSE if e.g. there is no preset with that name
|
gboolean gst_preset_save_preset (GstPreset *self
,const gchar *name
);
Save the current preset under the given name. If there is already a preset by
this name
it will be overwritten.
|
a GObject that implements GstPreset |
|
preset name to save |
Returns : |
TRUE for success, FALSE
|
gboolean gst_preset_rename_preset (GstPreset *self
,const gchar *old_name
,const gchar *new_name
);
Renames a preset. If there is already a preset by the new_name
it will be
overwritten.
|
a GObject that implements GstPreset |
|
current preset name |
|
new preset name |
Returns : |
TRUE for success, FALSE if e.g. there is no preset with old_name
|
gboolean gst_preset_delete_preset (GstPreset *self
,const gchar *name
);
Delete the given preset.
|
a GObject that implements GstPreset |
|
preset name to remove |
Returns : |
TRUE for success, FALSE if e.g. there is no preset with that name
|
gboolean gst_preset_set_meta (GstPreset *self
,const gchar *name
,const gchar *tag
,const gchar *value
);
Sets a new value
for an existing meta data item or adds a new item. Meta
data tag
names can be something like e.g. "comment". Supplying NULL
for the
value
will unset an existing value.
|
a GObject that implements GstPreset |
|
preset name |
|
meta data item name |
|
new value |
Returns : |
TRUE for success, FALSE if e.g. there is no preset with that name
|
gboolean gst_preset_get_meta (GstPreset *self
,const gchar *name
,const gchar *tag
,gchar **value
);
Gets the value
for an existing meta data tag
. Meta data tag
names can be
something like e.g. "comment". Returned values need to be released when done.
|
a GObject that implements GstPreset |
|
preset name |
|
meta data item name |
|
value |
Returns : |
TRUE for success, FALSE if e.g. there is no preset with that name
or no value for the given tag
|