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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>GstPreset: 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="libgstreamer.html" title="GStreamer Core Library">
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<link rel="prev" href="gstreamer-GstPoll.html" title="GstPoll">
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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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Object Hierarchy
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GstPreset
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GstPreset — helper interface for element presets
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Functions
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gchar **
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gst_preset_get_preset_names ()
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gchar **
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gst_preset_get_property_names ()
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gboolean
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gst_preset_load_preset ()
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gboolean
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gst_preset_save_preset ()
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gboolean
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gst_preset_rename_preset ()
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gboolean
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gst_preset_delete_preset ()
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gboolean
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gst_preset_set_meta ()
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gboolean
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gst_preset_get_meta ()
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gboolean
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gst_preset_set_app_dir ()
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const gchar *
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gst_preset_get_app_dir ()
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gboolean
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gst_preset_is_editable ()
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Types and Values
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GstPreset
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struct
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GstPresetInterface
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Object Hierarchy
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GInterface
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╰── GstPreset
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Includes
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#include <gst/gst.h>
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Description
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This interface offers methods to query and manipulate parameter preset sets.
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A preset is a bunch of property settings, together with meta data and a name.
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The name of a preset serves as key for subsequent method calls to manipulate
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single presets.
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All instances of one type will share the list of presets. The list is created
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on demand, if presets are not used, the list is not created.
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The interface comes with a default implementation that serves most plugins.
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Wrapper plugins will override most methods to implement support for the
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native preset format of those wrapped plugins.
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One method that is useful to be overridden is gst_preset_get_property_names().
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With that one can control which properties are saved and in which order.
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When implementing support for read-only presets, one should set the vmethods
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for gst_preset_save_preset() and gst_preset_delete_preset() to NULL.
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Applications can use gst_preset_is_editable() to check for that.
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The default implementation supports presets located in a system directory,
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application specific directory and in the users home directory. When getting
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a list of presets individual presets are read and overlaid in 1) system,
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2) application and 3) user order. Whenever an earlier entry is newer, the
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later entries will be updated. Since 1.8 you can also provide extra paths
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where to find presets through the GST_PRESET_PATH environment variable.
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Presets found in those paths will be concidered as "app presets".
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Functions
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gst_preset_get_preset_names ()
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gchar **
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gst_preset_get_preset_names (GstPreset *preset);
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Get a copy of preset names as a NULL terminated string array.
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Parameters
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preset
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a GObject that implements GstPreset
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Returns
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list with names, use g_strfreev() after usage.
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[transfer full][array zero-terminated=1][element-type gchar*]
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gst_preset_get_property_names ()
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gchar **
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gst_preset_get_property_names (GstPreset *preset);
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Get a the names of the GObject properties that can be used for presets.
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Parameters
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preset
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a GObject that implements GstPreset
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Returns
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an
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array of property names which should be freed with g_strfreev() after use.
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[transfer full][array zero-terminated=1][element-type gchar*]
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gst_preset_load_preset ()
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gboolean
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gst_preset_load_preset (GstPreset *preset,
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const gchar *name);
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Load the given preset.
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Parameters
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preset
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a GObject that implements GstPreset
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name
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preset name to load
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Returns
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TRUE for success, FALSE if e.g. there is no preset with that name
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gst_preset_save_preset ()
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gboolean
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gst_preset_save_preset (GstPreset *preset,
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const gchar *name);
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Save the current object settings as a preset under the given name. If there
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is already a preset by this name
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it will be overwritten.
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Parameters
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preset
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a GObject that implements GstPreset
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name
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preset name to save
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Returns
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TRUE for success, FALSE
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gst_preset_rename_preset ()
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gboolean
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gst_preset_rename_preset (GstPreset *preset,
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const gchar *old_name,
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const gchar *new_name);
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Renames a preset. If there is already a preset by the new_name
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it will be
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overwritten.
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Parameters
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preset
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a GObject that implements GstPreset
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old_name
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current preset name
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new_name
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new preset name
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Returns
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TRUE for success, FALSE if e.g. there is no preset with old_name
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gst_preset_delete_preset ()
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gboolean
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gst_preset_delete_preset (GstPreset *preset,
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const gchar *name);
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Delete the given preset.
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Parameters
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f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
preset
|
|
Packit |
f546b1 |
a GObject that implements GstPreset
|
|
Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
name
|
|
Packit |
f546b1 |
preset name to remove
|
|
Packit |
f546b1 |
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Packit |
f546b1 |
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Packit |
f546b1 |
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Packit |
f546b1 |
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE for success, FALSE if e.g. there is no preset with that name
|
|
Packit |
f546b1 |
|
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Packit |
f546b1 |
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Packit |
f546b1 |
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f546b1 |
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Packit |
f546b1 |
|
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Packit |
f546b1 |
gst_preset_set_meta ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_preset_set_meta (GstPreset *preset,
|
|
Packit |
f546b1 |
const gchar *name,
|
|
Packit |
f546b1 |
const gchar *tag,
|
|
Packit |
f546b1 |
const gchar *value);
|
|
Packit |
f546b1 |
Sets a new value
|
|
Packit |
f546b1 |
for an existing meta data item or adds a new item. Meta
|
|
Packit |
f546b1 |
data tag
|
|
Packit |
f546b1 |
names can be something like e.g. "comment". Supplying NULL for the
|
|
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f546b1 |
value
|
|
Packit |
f546b1 |
will unset an existing value.
|
|
Packit |
f546b1 |
|
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Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
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Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
preset
|
|
Packit |
f546b1 |
a GObject that implements GstPreset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
name
|
|
Packit |
f546b1 |
preset name
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
tag
|
|
Packit |
f546b1 |
meta data item name
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
value
|
|
Packit |
f546b1 |
new value.
|
|
Packit |
f546b1 |
[allow-none]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE for success, FALSE if e.g. there is no preset with that name
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_preset_get_meta ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_preset_get_meta (GstPreset *preset,
|
|
Packit |
f546b1 |
const gchar *name,
|
|
Packit |
f546b1 |
const gchar *tag,
|
|
Packit |
f546b1 |
gchar **value);
|
|
Packit |
f546b1 |
Gets the value
|
|
Packit |
f546b1 |
for an existing meta data tag
|
|
Packit |
f546b1 |
. Meta data tag
|
|
Packit |
f546b1 |
names can be
|
|
Packit |
f546b1 |
something like e.g. "comment". Returned values need to be released when done.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
preset
|
|
Packit |
f546b1 |
a GObject that implements GstPreset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
name
|
|
Packit |
f546b1 |
preset name
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
tag
|
|
Packit |
f546b1 |
meta data item name
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
value
|
|
Packit |
f546b1 |
value.
|
|
Packit |
f546b1 |
[out callee-allocates]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE for success, FALSE if e.g. there is no preset with that name
|
|
Packit |
f546b1 |
or no value for the given tag
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_preset_set_app_dir ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_preset_set_app_dir (const gchar *app_dir);
|
|
Packit |
f546b1 |
Sets an extra directory as an absolute path that should be considered when
|
|
Packit |
f546b1 |
looking for presets. Any presets in the application dir will shadow the
|
|
Packit |
f546b1 |
system presets.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
app_dir
|
|
Packit |
f546b1 |
the application specific preset dir.
|
|
Packit |
f546b1 |
[type filename]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE for success, FALSE if the dir already has been set
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_preset_get_app_dir ()
|
|
Packit |
f546b1 |
const gchar *
|
|
Packit |
f546b1 |
gst_preset_get_app_dir (void);
|
|
Packit |
f546b1 |
Gets the directory for application specific presets if set by the
|
|
Packit |
f546b1 |
application.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
the directory or NULL, don't free or modify
|
|
Packit |
f546b1 |
the string.
|
|
Packit |
f546b1 |
[nullable][type filename]
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gst_preset_is_editable ()
|
|
Packit |
f546b1 |
gboolean
|
|
Packit |
f546b1 |
gst_preset_is_editable (GstPreset *preset);
|
|
Packit |
f546b1 |
Check if one can add new presets, change existing ones and remove presets.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Parameters
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
preset
|
|
Packit |
f546b1 |
a GObject that implements GstPreset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Returns
|
|
Packit |
f546b1 |
TRUE if presets are editable or FALSE if they are static
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Since: 1.6
|
|
Packit |
f546b1 |
|
|
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f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Types and Values
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GstPreset
|
|
Packit |
f546b1 |
typedef struct _GstPreset GstPreset;
|
|
Packit |
f546b1 |
Opaque GstPreset data structure.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
struct GstPresetInterface
|
|
Packit |
f546b1 |
struct GstPresetInterface {
|
|
Packit |
f546b1 |
GTypeInterface parent;
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
/* methods */
|
|
Packit |
f546b1 |
gchar** (*get_preset_names) (GstPreset *preset);
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gchar** (*get_property_names) (GstPreset *preset);
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gboolean (*load_preset) (GstPreset *preset, const gchar *name);
|
|
Packit |
f546b1 |
gboolean (*save_preset) (GstPreset *preset, const gchar *name);
|
|
Packit |
f546b1 |
gboolean (*rename_preset) (GstPreset *preset, const gchar *old_name,
|
|
Packit |
f546b1 |
const gchar *new_name);
|
|
Packit |
f546b1 |
gboolean (*delete_preset) (GstPreset *preset, const gchar *name);
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
gboolean (*set_meta) (GstPreset *preset, const gchar *name,
|
|
Packit |
f546b1 |
const gchar *tag, const gchar *value);
|
|
Packit |
f546b1 |
gboolean (*get_meta) (GstPreset *preset, const gchar *name,
|
|
Packit |
f546b1 |
const gchar *tag, gchar **value);
|
|
Packit |
f546b1 |
};
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GstPreset interface.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
Members
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
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f546b1 |
|
|
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f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
GTypeInterface parent;
|
|
Packit |
f546b1 |
parent interface type.
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
get_preset_names ()
|
|
Packit |
f546b1 |
virtual method to get list of presets
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
get_property_names ()
|
|
Packit |
f546b1 |
virtual methods to get properties that are persistent
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
load_preset ()
|
|
Packit |
f546b1 |
virtual methods to load a preset into properties
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
save_preset ()
|
|
Packit |
f546b1 |
virtual methods to save properties into a preset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
rename_preset ()
|
|
Packit |
f546b1 |
virtual methods to rename a preset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
delete_preset ()
|
|
Packit |
f546b1 |
virtual methods to remove a preset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
set_meta ()
|
|
Packit |
f546b1 |
virtual methods to set textual meta data to a preset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
get_meta ()
|
|
Packit |
f546b1 |
virtual methods to get textual meta data from a preset
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
Packit |
f546b1 |
|
|
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f546b1 |
|
|
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f546b1 |
|
|
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f546b1 |
Generated by GTK-Doc V1.27
|
|
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f546b1 |
</body>
|
|
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f546b1 |
</html>
|