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1   /**
2    * This file Copyright (c) 2013-2017 Magnolia International
3    * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
4    *
5    *
6    * This file is dual-licensed under both the Magnolia
7    * Network Agreement and the GNU General Public License.
8    * You may elect to use one or the other of these licenses.
9    *
10   * This file is distributed in the hope that it will be
11   * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12   * implied warranty of MERCHANTABILITY or FITNESS FOR A
13   * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14   * Redistribution, except as permitted by whichever of the GPL
15   * or MNA you select, is prohibited.
16   *
17   * 1. For the GPL license (GPL), you can redistribute and/or
18   * modify this file under the terms of the GNU General
19   * Public License, Version 3, as published by the Free Software
20   * Foundation.  You should have received a copy of the GNU
21   * General Public License, Version 3 along with this program;
22   * if not, write to the Free Software Foundation, Inc., 51
23   * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24   *
25   * 2. For the Magnolia Network Agreement (MNA), this file
26   * and the accompanying materials are made available under the
27   * terms of the MNA which accompanies this distribution, and
28   * is available at http://www.magnolia-cms.com/mna.html
29   *
30   * Any modifications to this file must keep this entire header
31   * intact.
32   *
33   */
34  package info.magnolia.dam.preview.xuggle;
35  
36  import java.awt.image.BufferedImage;
37  
38  import com.xuggle.mediatool.IMediaReader;
39  import com.xuggle.mediatool.MediaListenerAdapter;
40  import com.xuggle.mediatool.ToolFactory;
41  import com.xuggle.mediatool.event.IVideoPictureEvent;
42  
43  /**
44   * Class to extract frame from video using Xuggle.
45   */
46  public class XuggleCaptureFrames extends MediaListenerAdapter {
47      private int mVideoStreamIndex = -1;
48      private boolean gotFirst = false;
49      private String videoFile;
50      private Exception e;
51      private BufferedImage image;
52  
53      /**
54       * @param filename the name of the media file to read
55       */
56      public XuggleCaptureFrames(String videoFile) {
57          this.videoFile = videoFile;
58          this.e = null;
59      }
60  
61      public BufferedImage execute() throws Exception {
62          IMediaReader reader = ToolFactory.makeReader(videoFile);
63  
64          // BufferedImages created in BGR 24bit color space
65          reader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);
66  
67          // xuggle is event based
68          reader.addListener(this);
69  
70          // read out the contents of the media file ... rest is done in listener
71          while (reader.readPacket() == null && !gotFirst) {
72              // nothing extra to do here
73          }
74  
75          // re-throw exception if any
76          if (e != null) {
77              throw e;
78          }
79  
80          return image;
81      }
82  
83      /**
84       * Called after a video frame has been decoded from a media stream.
85       * This method blocks, so return quickly.
86       */
87      @Override
88      public void onVideoPicture(IVideoPictureEvent event) {
89          try {
90              // if the stream index does not match the selected stream index, then have a closer look
91              if (event.getStreamIndex() != mVideoStreamIndex) {
92                  // if the selected video stream id is not yet set, go ahead an select this lucky video stream
93                  if (-1 == mVideoStreamIndex) {
94                      mVideoStreamIndex = event.getStreamIndex();
95                  } else {
96                      // otherwise return, no need to show frames from this video stream
97                      return;
98                  }
99              }
100 
101             image = event.getImage();
102             gotFirst = true;
103         } catch (Exception e) {
104             this.e = e;
105         }
106     }
107 }