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.audio.reader;
31
32 import java.io.IOException;
33 import java.io.InputStream;
34 import java.util.ArrayList;
35 import java.util.List;
36
37 import org.openimaj.audio.SampleChunk;
38 import org.openimaj.audio.processor.FixedSizeSampleAudioProcessor;
39 import org.openimaj.audio.samples.SampleBuffer;
40 import org.openimaj.io.InputStreamObjectReader;
41 import org.openimaj.video.xuggle.XuggleAudio;
42
43 /**
44 * This class reads an input stream that contains audio data, and returns a list of
45 * {@link SampleBuffer}s that each contain 1 second of audio. The number of samples in
46 * each sample buffer may not be the same, as the length of the buffers is calculated
47 * from the format of the audio in the stream.
48 *
49 * @author David Dupplaw (dpd@ecs.soton.ac.uk)
50 * @created 7 May 2013
51 * @version $Author$, $Revision$, $Date$
52 */
53 public class OneSecondClipReader implements InputStreamObjectReader<List<SampleBuffer>>
54 {
55 /**
56 * {@inheritDoc}
57 * @see org.openimaj.io.ObjectReader#read(java.lang.Object)
58 */
59 @Override
60 public List<SampleBuffer> read( final InputStream stream ) throws IOException
61 {
62 // Open the stream.
63 final XuggleAudio xa = new XuggleAudio( stream );
64
65 // Setup a chunker that will get samples in one second chunks.
66 final int nSamplesInOneSecond = (int)(xa.getFormat().getSampleRateKHz() * 1000);
67 final FixedSizeSampleAudioProcessor f = new FixedSizeSampleAudioProcessor(
68 xa, nSamplesInOneSecond );
69
70 // Setup our output list
71 final List<SampleBuffer> buffers = new ArrayList<SampleBuffer>();
72
73 // Now read the audio until we're done
74 SampleChunk sc = null;
75 while( (sc = f.nextSampleChunk()) != null )
76 buffers.add( sc.getSampleBuffer() );
77
78 System.out.println( "Got "+buffers.size()+" one-second sample buffers.");
79
80 return buffers;
81 }
82
83 /**
84 * {@inheritDoc}
85 * @see org.openimaj.io.InputStreamObjectReader#canRead(java.io.InputStream, java.lang.String)
86 */
87 @Override
88 public boolean canRead( final InputStream stream, final String name )
89 {
90 return true;
91 }
92 }