001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030package org.openimaj.hardware.kinect;
031
032import java.nio.ByteBuffer;
033
034import org.bridj.Pointer;
035import org.openimaj.hardware.kinect.freenect.libfreenectLibrary.freenect_device;
036import org.openimaj.hardware.kinect.freenect.libfreenectLibrary.freenect_video_cb;
037import org.openimaj.image.Image;
038
039/**
040 * Abstract base class for the callback used with RGB and IR streams
041 * 
042 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
043 *
044 * @param <T> the type of image
045 */
046public abstract class KinectVideoStreamCallback<T extends Image<?,T>> extends freenect_video_cb implements KinectStreamCallback {
047        KinectStream<T> stream;
048        ByteBuffer buffer;
049        int nextTimeStamp;
050        T nextFrame;
051        boolean updated = false;
052        
053        /**
054         * Default constructor
055         * @param stream the video stream
056         */
057        public KinectVideoStreamCallback(KinectStream<T> stream) {
058                this.stream = stream;
059        }
060        
061        @Override
062        public synchronized void apply(Pointer<freenect_device> dev, Pointer<?> video, int timestamp) {
063                updated = true;
064                nextTimeStamp = timestamp;
065                
066                setImage();
067        }
068        
069        /**
070         * Set the current image from the underlying buffer data
071         */
072        public abstract void setImage();
073        
074        @Override
075        public synchronized void swapFrames() {
076                if (!updated) return;
077                
078                T tmp = stream.frame;
079                stream.frame = nextFrame;
080                nextFrame = tmp;
081                stream.timeStamp = nextTimeStamp;
082                updated = false;
083        }
084
085        @Override
086        public abstract void stop();
087}