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Java binding for the Gstreamer framework
/*
* Copyright (c) 2009 Levente Farkas
* Copyright (c) 2007 Wayne Meissner
*
* This file is part of gstreamer-java.
*
* This code is free software: you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License version 3 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with this work. If not, see , CustomSrcInfo> customSubclasses = new ConcurrentHashMap, CustomSrcInfo>();
@SuppressWarnings("unused")
private static class CustomSrcInfo {
GType type;
PadTemplate template;
Caps caps;
// Per-class callbacks used by gstreamer to initialize the subclass
GClassInitFunc classInit;
GBaseInitFunc baseInit;
// Per-instance callback functions - names must match GstBaseSrcClass
BaseSrcAPI.Create create;
BaseSrcAPI.Seek seek;
BooleanFunc1 is_seekable;
BooleanFunc1 start;
BooleanFunc1 stop;
BooleanFunc1 negotiate;
BaseSrcAPI.GetCaps get_caps;
BaseSrcAPI.SetCaps set_caps;
BaseSrcAPI.GetSize get_size;
BaseSrcAPI.GetTimes get_times;
BaseSrcAPI.Fixate fixate;
BaseSrcAPI.EventNotify event;
}
protected CustomSrc(Class subClass, String name) {
super(initializer(GOBJECT_API.g_object_new(getSubclassType(subClass), "name", name)));
}
private static CustomSrcInfo getSubclassInfo(Class subClass) {
synchronized (subClass) {
CustomSrcInfo info = customSubclasses.get(subClass);
if (info == null) {
init(subClass);
info = customSubclasses.get(subClass);
}
return info;
}
}
private static GType getSubclassType(Class subClass) {
return getSubclassInfo(subClass).type;
}
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
protected @interface SrcCallback {
public String value();
}
/**
* Used when more control of Buffer creation is desired than fillBuffer() affords.
*
* @param offset
* @param size
* @param bufRef
*/
@SrcCallback("create")
protected FlowReturn srcCreateBuffer(long offset, int size, Buffer[] bufRef) throws IOException {
// System.out.println("CustomSrc.createBuffer");
return FlowReturn.NOT_SUPPORTED;
}
/**
* Used when you just want to fill a Buffer with data. The Buffer
* will be allocated and initialized by gstreamer.
* @param offset
* @param size
* @param buffer
*/
@SrcCallback("create")
protected FlowReturn srcFillBuffer(long offset, int size, Buffer buffer) throws IOException {
logger.info("CustomSrc.srcFillBuffer");
return FlowReturn.NOT_SUPPORTED;
}
@SrcCallback("is_seekable")
protected boolean srcIsSeekable() {
logger.info("CustomSrc.srcIsSeekable");
return false;
}
@SrcCallback("seek")
protected boolean srcSeek(GstSegmentStruct segment) throws IOException {
logger.info("CustomSrc.srcSeek");
return false;
}
@SrcCallback("start")
protected boolean srcStart() {
logger.info("CustomSrc.srcStart");
return true;
}
@SrcCallback("stop")
protected boolean srcStop() {
logger.info("CustomSrc.srcStop");
return true;
}
@SrcCallback("negotiate")
protected boolean srcNegotiate() {
logger.info("CustomSrc.srcNegotiate");
return false;
}
@SrcCallback("get_caps")
protected Caps srcGetCaps() {
logger.info("CustomSrc.srcGetCaps");
return null;
}
@SrcCallback("set_caps")
protected boolean srcSetCaps(Caps caps) {
logger.info("CustomSrc.srcSetCaps");
return false;
}
@SrcCallback("get_size")
protected long srcGetSize() {
logger.info("CustomSrc.srcGetSize");
return -1;
}
@SrcCallback("event")
protected boolean srcEvent(Event ev) {
logger.info("CustomSrc.srcEvent");
return true;
}
@SrcCallback("get_times")
protected void srcGetTimes(Buffer buffer, long[] start, long[] end) {
logger.info("CustomSrc.srcGetTimes");
}
@SrcCallback("fixate")
protected void srcFixate(Caps caps) {
logger.info("CustomSrc.srcFixate");
}
private static final BaseSrcAPI.Create fillBufferCallback = new BaseSrcAPI.Create() {
public FlowReturn callback(BaseSrc element, long offset, int size, Pointer bufRef) {
try {
Buffer buffer = new Buffer(size);
//System.out.println("Sending buf=" + buf);
FlowReturn retVal = ((CustomSrc) element).srcFillBuffer(offset, size, buffer);
bufRef.setPointer(0, buffer.getAddress());
buffer.disown();
return retVal;
} catch (Exception ex) {
return FlowReturn.UNEXPECTED;
}
}
};
private static final BaseSrcAPI.Create createBufferCallback = new BaseSrcAPI.Create() {
public FlowReturn callback(BaseSrc element, long offset, int size, Pointer bufRef) {
try {
Buffer[] buffers = new Buffer[1];
FlowReturn retVal = ((CustomSrc) element).srcCreateBuffer(offset, size, buffers);
if (buffers[0] != null) {
Buffer buffer = buffers[0];
bufRef.setPointer(0, buffer.getAddress());
buffer.disown();
}
return retVal;
} catch (Exception ex) {
return FlowReturn.UNEXPECTED;
}
}
};
private static class BooleanFunc1 implements BaseSrcAPI.BooleanFunc1 {
private Method method;
public BooleanFunc1(String methodName) {
try {
method = CustomSrc.class.getDeclaredMethod(methodName, new Class[0]);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public boolean callback(BaseSrc element) {
try {
return ((Boolean) method.invoke(element)).booleanValue();
} catch (Exception ex) {
return false;
}
}
}
private static final BooleanFunc1 isSeekableCallback = new BooleanFunc1("srcIsSeekable");
private static final BooleanFunc1 startCallback = new BooleanFunc1("srcStart");
private static final BooleanFunc1 stopCallback = new BooleanFunc1("srcStop");
private static final BooleanFunc1 negotiateCallback = new BooleanFunc1("srcNegotiate");
private static final BaseSrcAPI.Seek seekCallback = new BaseSrcAPI.Seek() {
public boolean callback(BaseSrc element, GstSegmentStruct segment) {
try {
return ((CustomSrc) element).srcSeek(segment);
} catch (Exception ex) {
return false;
}
}
};
private static final BaseSrcAPI.SetCaps setCapsCallback = new BaseSrcAPI.SetCaps() {
public boolean callback(BaseSrc element, Caps caps) {
try {
return ((CustomSrc) element).srcSetCaps(caps);
} catch (Exception ex) {
return false;
}
}
};
private static final BaseSrcAPI.GetCaps getCapsCallback = new BaseSrcAPI.GetCaps() {
public Caps callback(BaseSrc element) {
try {
Caps caps = ((CustomSrc) element).srcGetCaps().copy();
caps.disown();
return caps;
} catch (Exception ex) {
Caps caps = Caps.emptyCaps();
caps.disown();
return caps;
}
}
};
private static final BaseSrcAPI.GetTimes getTimesCallback = new BaseSrcAPI.GetTimes() {
public void callback(BaseSrc src, Buffer buffer, Pointer startRef, Pointer endRef) {
try {
long[] start = {-1}, end = {-1};
((CustomSrc) src).srcGetTimes(buffer, start, end);
startRef.setLong(0, start[0]);
endRef.setLong(0, end[0]);
} catch (Exception ex) { }
}
};
private static final BaseSrcAPI.Fixate fixateCallback = new BaseSrcAPI.Fixate() {
public void callback(BaseSrc src, Caps caps) {
try {
((CustomSrc) src).srcFixate(caps);
} catch (Exception ex) {}
}
};
private static final BaseSrcAPI.EventNotify eventCallback = new BaseSrcAPI.EventNotify() {
public boolean callback(BaseSrc src, Event ev) {
try {
return ((CustomSrc) src).srcEvent(ev);
} catch (Exception ex) {
return false;
}
}
};
private static final BaseSrcAPI.GetSize getSizeCallback = new BaseSrcAPI.GetSize() {
public boolean callback(BaseSrc element, LongByReference sizeRef) {
try {
long size = ((CustomSrc) element).srcGetSize();
if (size < 0) {
return false;
}
sizeRef.setValue(size);
return true;
} catch (Exception ex) {
return false;
}
}
};
/**
* Checks if a method over-rides another method.
* @param m1
* @param m2
* @return
*/
private static final boolean isOverridingMethod(Method m1, Method m2) {
return m1.getDeclaringClass().isAssignableFrom(m2.getDeclaringClass())
&& m1.getDeclaringClass().isAssignableFrom(m2.getDeclaringClass())
&& m1.getName().equals(m2.getName())
&& m1.getReturnType().equals(m2.getReturnType())
&& (m1.getParameterTypes() != null
&& m2.getParameterTypes() != null
&& Arrays.equals(m1.getParameterTypes(), m2.getParameterTypes()));
}
/**
* Finds a method in the Class or any of its parent classes.
*
* @param cls
* @param method
* @return The method or null if not found.
*/
private static final Method findOverridingMethod(final Class cls, final Method method) {
for (Class next = cls; next != null; next = next.getSuperclass()) {
for (Method m : next.getDeclaredMethods()) {
if (isOverridingMethod(method, m)) {
return m;
}
}
}
return null;
}
private static void init(Class srcClass) {
final CustomSrcInfo info = new CustomSrcInfo();
customSubclasses.put(srcClass, info);
//
// Trawl through all the methods in the subclass, looking for ones that
// over-ride the ones in CustomSrc
//
for (Method m : CustomSrc.class.getDeclaredMethods()) {
SrcCallback cb = m.getAnnotation(SrcCallback.class);
if (cb == null) {
continue;
}
Method srcMethod = findOverridingMethod(srcClass, m);
if (srcMethod == null) {
continue;
}
if (srcMethod.equals(m)) {
// Skip it if it is the same as the method in CustomSrc
// System.out.println(srcMethod + " is the same as " + m);
continue;
}
// System.out.println("Setting callback for " + m.getName());
if (m.getName().equals("srcSeek")) {
info.seek = seekCallback;
} else if (m.getName().equals("srcIsSeekable")) {
info.is_seekable = isSeekableCallback;
} else if (m.getName().equals("srcFillBuffer")) {
info.create = fillBufferCallback;
} else if (m.getName().equals("srcCreateBuffer")) {
info.create = createBufferCallback;
} else if (m.getName().equals("srcStart")) {
info.start = startCallback;
} else if (m.getName().equals("srcStop")) {
info.stop = stopCallback;
} else if (m.getName().equals("srcNegotiate")) {
info.negotiate = negotiateCallback;
} else if (m.getName().equals("srcSetCaps")) {
info.set_caps = setCapsCallback;
} else if (m.getName().equals("srcGetCaps")) {
info.get_caps = getCapsCallback;
} else if (m.getName().equals("srcGetSize")) {
info.get_size = getSizeCallback;
} else if (m.getName().equals("srcGetTimes")) {
info.get_times = getTimesCallback;
} else if (m.getName().equals("srcFixate")) {
info.fixate = fixateCallback;
} else if (m.getName().equals("srcEvent")) {
info.event = eventCallback;
}
}
info.classInit = new GClassInitFunc() {
public void callback(Pointer g_class, Pointer class_data) {
BaseSrcAPI.GstBaseSrcClass base = new BaseSrcAPI.GstBaseSrcClass(g_class);
// Copy all the callback fields over
for (Field f : base.getClass().getDeclaredFields()) {
try {
Field infoField = info.getClass().getDeclaredField(f.getName());
if (f.getType().isAssignableFrom(infoField.getType())) {
f.set(base, infoField.get(info));
// System.out.println("Copied field " + f.getName());
}
} catch (Exception ex) {}
}
base.write();
}
};
info.baseInit = new GBaseInitFunc() {
public void callback(Pointer g_class) {
info.caps = Caps.anyCaps();
info.template = new PadTemplate("src", PadDirection.SRC, info.caps);
GstPadTemplateAPI.GSTPADTEMPLATE_API.gst_element_class_add_pad_template(g_class, info.template);
}
};
//
// gstreamer boilerplate to hook the plugin in
//
GTypeInfo ginfo = new GTypeInfo();
ginfo.class_init = info.classInit;
ginfo.base_init = info.baseInit;
ginfo.instance_init = null;
ginfo.class_size = (short)new BaseSrcAPI.GstBaseSrcClass().size();
ginfo.instance_size = (short)new BaseSrcAPI.GstBaseSrcStruct().size();
GType type = GOBJECT_API.g_type_register_static(BaseSrcAPI.BASESRC_API.gst_base_src_get_type(),
srcClass.getSimpleName(), ginfo, 0);
info.type = type;
}
}