GstParamSpec: GStreamer 1.0 Core Reference Manual

GstParamSpec

GstParamSpec — GParamSpec implementations specific to GStreamer

Functions

Types and Values

#define	GST_PARAM_CONTROLLABLE
#define	GST_PARAM_USER_SHIFT
#define	GST_PARAM_MUTABLE_PAUSED
#define	GST_PARAM_MUTABLE_PLAYING
#define	GST_PARAM_MUTABLE_READY
struct	GstParamSpecFraction

Includes

#include <gst/gst.h>

Description

GParamSpec implementations specific to GStreamer.

Functions

gst_param_spec_fraction ()

GParamSpec *
gst_param_spec_fraction (const gchar *name,
                         const gchar *nick,
                         const gchar *blurb,
                         gint min_num,
                         gint min_denom,
                         gint max_num,
                         gint max_denom,
                         gint default_num,
                         gint default_denom,
                         GParamFlags flags);

This function creates a fraction GParamSpec for use by objects/elements that want to expose properties of fraction type. This function is typically used in connection with g_object_class_install_property() in a GObjects's instance_init function.

Parameters

name	canonical name of the property specified
nick	nick name for the property specified
blurb	description of the property specified
min_num	minimum value (fraction numerator)
min_denom	minimum value (fraction denominator)
max_num	maximum value (fraction numerator)
max_denom	maximum value (fraction denominator)
default_num	default value (fraction numerator)
default_denom	default value (fraction denominator)
flags	flags for the property specified

Returns

a newly created parameter specification.

[transfer full]

Types and Values

GST_PARAM_CONTROLLABLE

#define GST_PARAM_CONTROLLABLE (1 << (G_PARAM_USER_SHIFT + 1))

Use this flag on GObject properties to signal they can make sense to be. controlled over time. This hint is used by the GstController.

GST_PARAM_USER_SHIFT

#define GST_PARAM_USER_SHIFT (1 << (G_PARAM_USER_SHIFT + 8))

Bits based on GST_PARAM_USER_SHIFT can be used by 3rd party applications.

GST_PARAM_MUTABLE_PAUSED

#define GST_PARAM_MUTABLE_PAUSED  (1 << (G_PARAM_USER_SHIFT + 3))

Use this flag on GObject properties of GstElements to indicate that they can be changed when the element is in the PAUSED or lower state. This flag implies GST_PARAM_MUTABLE_READY.

GST_PARAM_MUTABLE_PLAYING

#define GST_PARAM_MUTABLE_PLAYING  (1 << (G_PARAM_USER_SHIFT + 4))

Use this flag on GObject properties of GstElements to indicate that they can be changed when the element is in the PLAYING or lower state. This flag implies GST_PARAM_MUTABLE_PAUSED.

GST_PARAM_MUTABLE_READY

#define GST_PARAM_MUTABLE_READY  (1 << (G_PARAM_USER_SHIFT + 2))

Use this flag on GObject properties of GstElements to indicate that they can be changed when the element is in the READY or lower state.

struct GstParamSpecFraction

struct GstParamSpecFraction {
  GParamSpec    parent_instance;

  gint          min_num, min_den;
  gint          max_num, max_den;
  gint          def_num, def_den;
};

A GParamSpec derived structure that contains the meta data for fractional properties.

Members

gint `min_num`;	minimal numerator
gint `min_den`;	minimal denominator
gint `max_num`;	maximal numerator
gint `max_den`;	maximal denominator
gint `def_num`;	default numerator
gint `def_den`;	default denominator