/**
* Base class for the GStreamer object hierarchy
*
* <p>GstObject provides a root for the object hierarchy tree filed in by the GStreamer library. It
* is currently a thin wrapper on top of {@link GObject}. It is an abstract class that is not very
* usable on its own.
*/
public class GstObject extends GObject {
private static Logger logger = Logger.getLogger(GstObject.class.getName());
private static final GstObjectAPI gst = GstNative.load(GstObjectAPI.class);
/**
* Wraps an underlying C GstObject with a Java proxy
*
* @param init Initialization data
*/
public GstObject(Initializer init) {
super(init);
}
protected static Initializer initializer(Pointer ptr) {
return initializer(ptr, true, true);
}
protected static Initializer initializer(Pointer ptr, boolean needRef) {
return initializer(ptr, needRef, true);
}
/**
* Steal the native peer from another GstObject. After calling this, the victim object is
* disconnected from the native object and any attempt to use it will throw an exception.
*
* @param victim The GstObject to takeover.
* @return An Initializer that can be passed to {@link #GstObject}
*/
protected static Initializer steal(GstObject victim) {
Initializer init = new Initializer(victim.handle(), false, true);
victim.invalidate();
return init;
}
/**
* Sets the name of this object, or gives this object a guaranteed unique name (if name is null).
*
* <p>Returns: TRUE if the name could be set. Since Objects that have a parent cannot be renamed,
* this function returns FALSE in those cases.
*
* <p>MT safe.
*
* @param name new name of object
* @return true if the name was set. Since Objects that have a parent cannot be renamed, this
* function returns false in those cases.
*/
public boolean setName(String name) {
logger.entering("GstObject", "setName", name);
return gst.gst_object_set_name(this, name);
}
/**
* Returns a copy of the name of this object.
*
* <p>For a nameless object, this returns null.
*
* @return the name of this object.
*/
public String getName() {
logger.entering("GstObject", "getName");
return gst.gst_object_get_name(this);
}
@Override
public String toString() {
return String.format("%s: [%s]", getClass().getSimpleName(), getName());
}
protected void ref() {
gst.gst_object_ref(this);
}
protected void unref() {
gst.gst_object_unref(this);
}
@Override
protected void sink() {
gst.gst_object_ref_sink(this);
}
public GstObject getParent() {
return gst.gst_object_get_parent(this);
}
/**
* Adds an {@link EventListenerProxy} on this object. This is used by subclasses that wish to map
* between java style event listeners and gstreamer signals.
*
* @param listenerClass Class of the listener being added.
* @param listener The listener being added.
* @param proxy Proxy for the event listener.
*/
protected synchronized void addListenerProxy(
Class<? extends EventListener> listenerClass,
EventListener listener,
EventListenerProxy proxy) {
Map<EventListener, EventListenerProxy> map = getListenerMap().get(listenerClass);
/*
* Create the map for this class if it doesn't exist
*/
if (map == null) {
map = new HashMap<EventListener, EventListenerProxy>();
getListenerMap().put(listenerClass, map);
}
map.put(listener, proxy);
}
/**
* Removes an {@link EventListenerProxy} from this object. This is used by subclasses that wish to
* map between java style event listeners and gstreamer signals.
*
* @param listenerClass The class of listener the proxy was added for.
* @param listener The listener the proxy was added for.
* @return The proxy that was removed, or null if no proxy was found.
*/
protected synchronized EventListenerProxy removeListenerProxy(
Class<? extends EventListener> listenerClass, EventListener listener) {
Map<EventListener, EventListenerProxy> map = getListenerMap().get(listenerClass);
if (map == null) {
return null;
}
EventListenerProxy proxy = map.remove(listener);
/*
* Reclaim memory if this listener class is no longer used
*/
if (map.isEmpty()) {
listenerMap.remove(listenerClass);
if (listenerMap.isEmpty()) {
listenerMap = null;
}
}
return proxy;
}
private Map<Class<? extends EventListener>, Map<EventListener, EventListenerProxy>>
getListenerMap() {
if (listenerMap == null) {
listenerMap =
new HashMap<Class<? extends EventListener>, Map<EventListener, EventListenerProxy>>();
}
return listenerMap;
}
private Map<Class<? extends EventListener>, Map<EventListener, EventListenerProxy>> listenerMap;
}
/** Used to query the total duration of a stream. */
public class DurationQuery extends Query {
private static interface API extends com.sun.jna.Library {
Pointer ptr_gst_query_new_duration(Format format);
void gst_query_set_duration(Query query, Format format, /* gint64 */ long duration);
void gst_query_parse_duration(Query query, Format[] format, /* gint64 * */ long[] duration);
}
private static final API gst = GstNative.load(API.class);
public DurationQuery(Initializer init) {
super(init);
}
/**
* Constructs a new stream duration query object to query in the given format. A duration query
* will give the total length of the stream.
*
* @param format the {@link Format} for this duration query.
*/
public DurationQuery(Format format) {
super(initializer(gst.ptr_gst_query_new_duration(format)));
}
/**
* Answers a duration query by setting the requested value in the given format.
*
* @param format the {@link Format} for the duration
* @param duration the duration of the stream
*/
public void setDuration(Format format, long duration) {
gst.gst_query_set_duration(this, format, duration);
}
/**
* Gets the format of this duration query.
*
* @return The {@link Format} of the duration value.
*/
public Format getFormat() {
Format[] fmt = new Format[1];
gst.gst_query_parse_duration(this, fmt, null);
return fmt[0];
}
/**
* Gets the duration answer for this duration query.
*
* @return The total duration.
*/
public long getDuration() {
long[] duration = new long[1];
gst.gst_query_parse_duration(this, null, duration);
return duration[0];
}
/**
* Gets the duration as a user-readable string.
*
* @return A string representing the duration.
*/
@Override
public String toString() {
return String.format("duration: [format=%s, duration=%d]", getFormat(), getDuration());
}
}
/**
* ElementFactory is used to create instances of elements.
*
* <p>Use the {@link #find} and {@link #create} methods to create element instances or use {@link
* #make} as a convenient shortcut.
*/
public class ElementFactory extends PluginFeature {
private static Logger logger = Logger.getLogger(ElementFactory.class.getName());
private static Level DEBUG = Level.FINE;
private static final Map<String, Class<? extends Element>> typeMap =
new HashMap<String, Class<? extends Element>>();
public static final String GTYPE_NAME = "GstElementFactory";
private static interface API
extends GstElementFactoryAPI, GstCapsAPI, GstPadTemplateAPI, GstPluginAPI {}
private static final API gst = GstNative.load(API.class);
private static final GlibAPI glib = GlibAPI.GLIB_API;
/** Register a new class into the typeMap. */
public static void registerElement(Class<? extends Element> klass, String name) {
typeMap.put(name, klass);
}
/**
* Retrieve an instance of a factory that can produce {@link Element}s
*
* @param name The type of {@link Element} to produce.
* @return An ElementFactory that will produce {@link Element}s of the desired type.
*/
public static ElementFactory find(String name) {
logger.entering("ElementFactory", "find", name);
ElementFactory factory = gst.gst_element_factory_find(name);
if (factory == null) {
throw new IllegalArgumentException("No such Gstreamer factory: " + name);
}
return factory;
}
/**
* Creates a new Element from the specified factory.
*
* @param factoryName The name of the factory to use to produce the Element
* @param name The name to assign to the created Element
* @return A new GstElemElement
*/
public static Element make(String factoryName, String name) {
logger.entering("ElementFactory", "make", new Object[] {factoryName, name});
return elementFor(makeRawElement(factoryName, name), factoryName);
}
/**
* Get a list of factories that match the given type. Only elements with a rank greater or equal
* to minrank will be returned. The list of factories is returned by decreasing rank.
*
* @param type a {@link ElementFactoryListType}
* @param minrank Minimum rank
* @return a List of ElementFactory elements.
*/
public static List<ElementFactory> listGetElement(ElementFactoryListType type, Rank minrank) {
GList glist = gst.gst_element_factory_list_get_elements(type.getValue(), minrank.getValue());
List<ElementFactory> list = new ArrayList<ElementFactory>();
GList next = glist;
while (next != null) {
if (next.data != null) {
ElementFactory fact = new ElementFactory(initializer(next.data, true, true));
list.add(fact);
}
next = next.next();
}
gst.gst_plugin_list_free(glist);
return list;
}
private static List<ElementFactory> lister(
GList glist, Caps caps, PadDirection direction, boolean subsetonly) {
List<ElementFactory> filterList = new ArrayList<ElementFactory>();
GList gFilterList = gst.gst_element_factory_list_filter(glist, caps, direction, subsetonly);
GList next = gFilterList;
while (next != null) {
if (next.data != null) {
ElementFactory fact = new ElementFactory(initializer(next.data, true, true));
filterList.add(fact);
}
next = next.next();
}
gst.gst_plugin_list_free(glist);
gst.gst_plugin_list_free(gFilterList);
return filterList;
}
/**
* Filter out all the elementfactories in list that can handle caps in the given direction.
*
* <p>If subsetonly is true, then only the elements whose pads templates are a complete superset
* of caps will be returned. Else any element whose pad templates caps can intersect with caps
* will be returned.
*
* @param list a {@link List} of {@link ElementFactory} to filter
* @param caps a {@link Caps}
* @param direction a {@link PadDirection} to filter on
* @param subsetonly whether to filter on caps subsets or not.
* @return a {@link List} of {@link ElementFactory} elements that match the given requisits.
*/
public static List<ElementFactory> listFilter(
List<ElementFactory> list, Caps caps, PadDirection direction, boolean subsetonly) {
GList glist = null;
for (ElementFactory fact : list) {
fact.ref();
glist = glib.g_list_append(glist, fact.handle());
}
return lister(glist, caps, direction, subsetonly);
}
/**
* Get a list of factories that match the given parameter.
*
* <p>It is a combination of listGetElement and listFilter passing all the results of the first
* call to the second.
*
* <p>This method improves performance because there is no need to map to java list the elements
* returned by the first call.
*
* @param type a {@link ElementFactoryListType}
* @param minrank Minimum rank
* @param caps a {@link Caps}
* @param direction a {@link PadDirection} to filter on
* @param subsetonly whether to filter on caps subsets or not.
* @return a {@link List} of {@link ElementFactory} elements that match the given requisits.
*/
public static List<ElementFactory> listGetElementFilter(
ElementFactoryListType type,
Rank minrank,
Caps caps,
PadDirection direction,
boolean subsetonly) {
GList glist = gst.gst_element_factory_list_get_elements(type.getValue(), minrank.getValue());
return lister(glist, caps, direction, subsetonly);
}
public static Pointer makeRawElement(String factoryName, String name) {
logger.entering("ElementFactory", "makeRawElement", new Object[] {factoryName, name});
Pointer elem = gst.ptr_gst_element_factory_make(factoryName, name);
logger.log(DEBUG, "Return from gst_element_factory_make=" + elem);
if (elem == null) {
throw new IllegalArgumentException("No such Gstreamer factory: " + factoryName);
}
return elem;
}
@SuppressWarnings("unchecked")
private static Element elementFor(Pointer ptr, String factoryName) {
Class<? extends Element> cls = typeMap.get(factoryName);
cls = (cls == null) ? (Class<Element>) GstTypes.classFor(ptr) : cls;
cls = (cls == null || !Element.class.isAssignableFrom(cls)) ? Element.class : cls;
return NativeObject.objectFor(ptr, cls);
}
/**
* Creates a new instance of ElementFactory
*
* @param init internal initialization data.
*/
public ElementFactory(Initializer init) {
super(init);
logger.entering("ElementFactory", "<init>", new Object[] {init});
}
/**
* Creates a new element from the factory.
*
* @param name the name to assign to the created Element
* @return A new {@link Element}
*/
public Element create(String name) {
logger.entering("ElementFactory", "create", name);
Pointer elem = gst.ptr_gst_element_factory_create(this, name);
logger.log(DEBUG, "gst_element_factory_create returned: " + elem);
if (elem == null) {
throw new IllegalArgumentException("Cannot create GstElement");
}
return elementFor(elem, getName());
}
/**
* Returns the name of the person who wrote the factory.
*
* @return The name of the author
*/
public String getAuthor() {
logger.entering("ElementFactory", "getAuthor");
return gst.gst_element_factory_get_author(this);
}
/**
* Returns a description of the factory.
*
* @return A brief description of the factory.
*/
public String getDescription() {
logger.entering("ElementFactory", "getDescription");
return gst.gst_element_factory_get_description(this);
}
/**
* Returns the long, English name for the factory.
*
* @return The long, English name for the factory.
*/
public String getLongName() {
logger.entering("ElementFactory", "getLongName");
return gst.gst_element_factory_get_longname(this);
}
/**
* Returns a string describing the type of factory. This is an unordered list separated with
* slashes ('/').
*
* @return The description of the type of factory.
*/
public String getKlass() {
logger.entering("ElementFactory", "getKlass");
return gst.gst_element_factory_get_klass(this);
}
/**
* Gets the list of {@link StaticPadTemplate} for this factory.
*
* @return The list of {@link StaticPadTemplate}
*/
public List<StaticPadTemplate> getStaticPadTemplates() {
logger.entering("ElementFactory", "getStaticPadTemplates");
GList glist = gst.gst_element_factory_get_static_pad_templates(this);
logger.log(DEBUG, "gst.gst_element_factory_get_static_pad_templates returned: " + glist);
List<StaticPadTemplate> templates = new ArrayList<StaticPadTemplate>();
GList next = glist;
while (next != null) {
if (next.data != null) {
GstStaticPadTemplate temp = new GstStaticPadTemplate(next.data);
templates.add(
new StaticPadTemplate(
temp.name_template,
temp.direction,
temp.presence,
gst.gst_static_caps_get(temp.static_caps)));
}
next = next.next();
}
return templates;
}
public enum ElementFactoryListType {
DECODER((long) 1 << 0),
ENCODER((long) 1 << 1),
SINK((long) 1 << 2),
SRC((long) 1 << 3),
MUXER((long) 1 << 4),
DEMUXER((long) 1 << 5),
PARSER((long) 1 << 6),
PAYLOADER((long) 1 << 7),
DEPAYLOADER((long) 1 << 8),
FORMATTER((long) 1 << 9),
MAX_ELEMENTS((long) 1 << 48),
ANY((((long) 1) << 49) - 1),
MEDIA_ANY(~((long) 0) << 48),
MEDIA_VIDEO((long) 1 << 49),
MEDIA_AUDIO((long) 1 << 50),
MEDIA_IMAGE((long) 1 << 51),
MEDIA_SUBTITLE((long) 1 << 52),
MEDIA_METADATA((long) 1 << 53),
VIDEO_ENCODER(ENCODER.getValue() | MEDIA_VIDEO.getValue() | MEDIA_IMAGE.getValue()),
AUDIO_ENCODER(ENCODER.getValue() | MEDIA_AUDIO.getValue()),
AUDIOVIDEO_SINKS(
SINK.getValue() | MEDIA_AUDIO.getValue() | MEDIA_VIDEO.getValue() | MEDIA_IMAGE.getValue()),
DECODABLE(ENCODER.getValue() | DEMUXER.getValue() | DEPAYLOADER.getValue() | PARSER.getValue());
private long value;
private ElementFactoryListType(long value) {
this.value = value;
}
public long getValue() {
return value;
}
}
}