5539eea893239bb7c1eca7303d2792157f9ef385
[sonitus.git] / src / main / java / net / pterodactylus / sonitus / data / filter / AudioProcessingFilter.java
1 /*
2  * Sonitus - AudioProcessingFilter.java - Copyright © 2013 David Roden
3  *
4  * This program is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 package net.pterodactylus.sonitus.data.filter;
19
20 import java.io.IOException;
21 import java.io.OutputStream;
22
23 import net.pterodactylus.sonitus.data.Filter;
24 import net.pterodactylus.sonitus.io.ProcessingOutputStream;
25
26 /**
27  * {@link Filter} implementation that can process audio samples internally.
28  *
29  * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
30  */
31 public abstract class AudioProcessingFilter extends DummyFilter {
32
33         //
34         // DUMMYFILTER METHODS
35         //
36
37         @Override
38         protected OutputStream createOutputStream() throws IOException {
39                 OutputStream originalOutputStream = super.createOutputStream();
40                 ProcessingOutputStream processingOutputStream = new ProcessingOutputStream(originalOutputStream, metadata().channels()) {
41
42                         @Override
43                         protected int[] processSamples(int[] samples) {
44                                 return AudioProcessingFilter.this.processSamples(samples);
45                         }
46                 };
47                 return processingOutputStream;
48         }
49
50         //
51         // SUBCLASS METHODS
52         //
53
54         /**
55          * Called to process the given of channels for a single sample.
56          *
57          * @param samples
58          *              The channel values of the sample
59          * @return The processed channel values
60          */
61         protected abstract int[] processSamples(int[] samples);
62
63 }