1 /**
2 * Copyright (c) 2011, The University of Southampton and the individual contributors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * * Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * * Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * * Neither the name of the University of Southampton nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30 package org.openimaj.video.xuggle;
31
32 import java.io.File;
33 import java.io.IOException;
34 import java.net.URL;
35 import java.util.HashMap;
36 import java.util.Map;
37
38 import org.apache.commons.io.FileUtils;
39
40 import com.xuggle.xuggler.io.FileProtocolHandler;
41 import com.xuggle.xuggler.io.IURLProtocolHandler;
42
43 /**
44 * An {@link IURLProtocolHandler} for jar resources. This implementation copies
45 * the resource to a temporary file before opening it - it could potentially
46 * consume a stream directly, but this would restrict the video codecs to ones
47 * that directly support streaming.
48 *
49 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk)
50 */
51 public class JarURLProtocolHandler extends FileProtocolHandler {
52 private static final Map<URL, String> extractedVideos = new HashMap<URL, String>();
53
54 /**
55 * Construct with no video
56 */
57 public JarURLProtocolHandler() {
58
59 }
60
61 /**
62 * Construct with the given url. The video will be extracted immediately.
63 *
64 * @param url
65 * the url to the video
66 * @throws IOException
67 * if an error occurs
68 */
69 public JarURLProtocolHandler(String url) throws IOException {
70 super(extract(url));
71 }
72
73 @Override
74 public int open(String url, int flags) {
75 if (flags != URL_RDONLY_MODE) {
76 // log.debug("Cannot write to a video in a jar file");
77 return -1;
78 }
79
80 try {
81 return super.open(extract(url), flags);
82 } catch (final IOException e) {
83 // log.error("Unexpected IOException: " + e);
84 e.printStackTrace();
85 return -1;
86 }
87 }
88
89 private static String extract(String urlString) throws IOException {
90 final URL url = new URL(urlString);
91
92 if (extractedVideos.containsKey(url))
93 return extractedVideos.get(url);
94
95 final File tmp = File.createTempFile("movie", ".tmp");
96 final String filename = tmp.toURI().toString();
97 // log.debug("Mapping url " + urlString + " to file " + tmp);
98 tmp.deleteOnExit();
99 FileUtils.copyURLToFile(url, tmp);
100 extractedVideos.put(url, filename);
101
102 return filename;
103 }
104
105 @Override
106 public int write(byte[] paramArrayOfByte, int paramInt) {
107 // writing not supported
108 return -1;
109 }
110 }