![]() | ![]() | ![]() | GStreamer 0.8 Core Reference Manual | ![]() |
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GstImplementsInterface — Core interface implemented by GstElements that allows runtime querying of interface availabillity
struct GstImplementsInterface; #define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_CAST(obj, type, cast_t) #define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_TYPE(obj, type) gboolean gst_element_implements_interface (GstElement *element, GType iface_type); gpointer gst_implements_interface_cast (gpointer from, GType type); gboolean gst_implements_interface_check (gpointer from, GType type);
GstImplementsInterface is required by GstColorBalance, GstMixer, GstTuner and GstXOverlay.
GstImplementsInterface is implemented by GstOssSink, GstV4lSrc, GstAlsaMixer, GstCACASink, GstVolume, GstV4lMjpegSrc, GstV4lMjpegSink, GstXImageSink, GstAlsaSrc, GstAlsaSink, GstXvImageSink, GstGLImageSink, GstVideobalance, GstSDLVideoSink, GstV4lElement, GstOssElement, GstPwcSrc and GstOssSrc.
#define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_CAST(obj, type, cast_t)
obj : | |
type : | |
cast_t : |
#define GST_IMPLEMENTS_INTERFACE_CHECK_INSTANCE_TYPE(obj, type)
obj : | |
type : |
gboolean gst_element_implements_interface (GstElement *element, GType iface_type);
Test whether the given element implements a certain interface of type iface_type, and test whether it is supported for this specific instance.
element : | GstElement to check for the implementation of the interface |
iface_type : | (final) type of the interface which we want to be implemented |
Returns : | whether or not the element implements the interface. |
gpointer gst_implements_interface_cast (gpointer from, GType type);
cast a given object to an interface type, and check whether this interface is supported for this specific instance.
from : | the object (any sort) from which to cast to the interface |
type : | the interface type to cast to |
Returns : | a gpointer to the interface type |
gboolean gst_implements_interface_check (gpointer from, GType type);
check a given object for an interface implementation, and check whether this interface is supported for this specific instance.
from : | the object (any sort) from which to check from for the interface |
type : | the interface type to check for |
Returns : | whether or not the object implements the given interface |
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