VisClient/org/hfbk/vid/AVImageLoader.java

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package org.hfbk.vid;

import java.nio.ByteBuffer;

import net.sf.ffmpeg_java.AVFormatLibrary.AVPacket;

import org.hfbk.vis.Prefs;

import com.sun.jna.Native;

public class AVImageLoader {
        
        final int MAXPIXELS=5000000;

        public ByteBuffer pixels;
        public int width, height;
        
        //Pointer pixelPointer; // to release memory on our own
        
        AVStreamingThread loader;
        
        public AVImageLoader(String url, boolean thumbnail) {
                
                loader=new AVStreamingThread(url, (thumbnail ? Prefs.current.thumbpixels: MAXPIXELS));
                
                AVVideoThread vt=loader.videoThread;
                
                if(vt==null) throw new RuntimeException("AVStillPicture: Could not open "+url);
                
                width =vt.width;
                height=vt.height;

                AVPacket packet = new AVPacket();
                
                while (AV.FORMAT.av_read_frame(loader.formatCtx, packet) >= 0)
                {
                        if (packet.stream_index == loader.videoTrack){
                                pixels=vt.decodeVideo(packet);
                        }
                        vt.free(packet);
                }
                
                //pixelPointer=vt.frameRGB.data0;
                vt.frameRGB.data0=null;  //release pixel data from the video engine
                                         //we clean up later.
                vt.close();              //so we can free any ressources except the pixel data now.
                loader.close();
        }

        public void free(){             
                AV.UTIL.av_free(Native.getDirectBufferPointer(pixels));
                pixels=null;
        }       
}

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