/*
* Copyright (c) 2011 Andres Colubri
*
* 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 <http://www.gnu.org/licenses/>.
*/
package org.gstreamer.elements;
import java.nio.ByteBuffer;
import org.gstreamer.Bin;
import org.gstreamer.Buffer;
import org.gstreamer.Caps;
import org.gstreamer.Element;
import org.gstreamer.ElementFactory;
import org.gstreamer.GhostPad;
import org.gstreamer.Pad;
import org.gstreamer.Pipeline;
import org.gstreamer.lowlevel.GstBinAPI;
import org.gstreamer.lowlevel.GstNative;
/**
* Class that allows to pull out buffers from the GStreamer pipeline into
* the application, using an appsink. The buffers are NOT converted into
* 32bit RGB.
*/
public class ByteDataSink extends Bin {
private static final GstBinAPI gst = GstNative.load(GstBinAPI.class);
private final BaseSink sink;
private boolean passDirectBuffer = false;
private Listener listener;
public static interface Listener {
void byteFrame(boolean isPrerollFrame, Caps caps, int size, ByteBuffer data);
}
/**
* Creates a new instance of RGBDataSink with the given name.
*
* @param name The name used to identify this pipeline.
*/
public ByteDataSink(String name, Listener listener) {
super(initializer(gst.ptr_gst_bin_new(name)));
this.listener = listener;
sink = (FakeSink) ElementFactory.make("fakesink", name);
sink.set("signal-handoffs", true);
sink.set("sync", true);
sink.set("preroll-queue-len", 1);
sink.connect((BaseSink.HANDOFF) new DataHandoffListener());
sink.connect((BaseSink.PREROLL_HANDOFF) new DataHandoffListener());
//
// Adding identity element
//
Element conv = ElementFactory.make("identity", "Data");
addMany(conv, sink);
Element.linkMany(conv, sink);
//
// Link the ghost pads on the bin to the sink pad on the convertor
//
addPad(new GhostPad("sink", conv.getStaticPad("sink")));
}
public ByteDataSink(String name, Pipeline pipeline, Listener listener) {
super(initializer(gst.ptr_gst_bin_new(name)));
this.listener = listener;
Element element = pipeline.getElementByName(name);
if (element != null) {
// TODO: Fix. This doesn't work as it should. getElementByName() returns a
// BaseSink which cannot be casted to FakeSink.
sink = (BaseSink) element;
sink.set("signal-handoffs", true);
sink.set("sync", true);
sink.set("preroll-queue-len", 1);
sink.connect((BaseSink.HANDOFF) new DataHandoffListener());
sink.connect((BaseSink.PREROLL_HANDOFF) new DataHandoffListener());
} else {
sink = null;
throw new RuntimeException("Element with name " + name + " not found in the pipeline");
}
}
/**
* Sets the listener to null. This should be used when disposing
* the parent object that contains the listener method, to make sure
* that no dangling references remain to the parent.
*/
public void removeListener() {
this.listener = null;
}
/**
* Indicate whether the {@link RGBDataSink} should pass the native {@link java.nio.IntBuffer}
* to the listener, or should copy it to a heap buffer. The default is to pass
* a heap {@link java.nio.IntBuffer} copy of the data
* @param passThru If true, pass through the native IntBuffer instead of
* copying it to a heap IntBuffer.
*/
public void setPassDirectBuffer(boolean passThru) {
this.passDirectBuffer = passThru;
}
/**
* Gets the actual gstreamer sink element.
*
* @return a BaseSink
*/
public BaseSink getSinkElement() {
return sink;
}
class DataHandoffListener implements BaseSink.HANDOFF, BaseSink.PREROLL_HANDOFF {
public void handoff(BaseSink sink, Buffer buffer, Pad pad) {
doHandoff(buffer, pad, false);
}
public void prerollHandoff(BaseSink sink, Buffer buffer, Pad pad) {
doHandoff(buffer, pad, true);
}
private void doHandoff(Buffer buffer, Pad pad, boolean isPrerollFrame) {
Caps caps = buffer.getCaps();
int n = buffer.getSize();
if (n < 1) {
return;
}
ByteBuffer data;
if (passDirectBuffer) {
data = buffer.getByteBuffer();
} else {
data = ByteBuffer.allocate(n);
data.put(buffer.getByteBuffer()).flip();
}
listener.byteFrame(isPrerollFrame, caps, n, data);
//
// Dispose of the gstreamer buffer immediately to avoid more being
// allocated before the java GC kicks in
//
buffer.dispose();
}
}
}