2 * Sonitus - ExternalMp3Decoder.java - Copyright © 2013 David Roden
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.
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.
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/>.
18 package net.pterodactylus.sonitus.data.filter;
20 import static com.google.common.base.Preconditions.*;
22 import net.pterodactylus.sonitus.data.ConnectException;
23 import net.pterodactylus.sonitus.data.Format;
24 import net.pterodactylus.sonitus.data.Source;
27 * Basic {@link ExternalFilter} implementation that verifies that the connected
28 * source is MP3-encoded and returns a PCM-encoded stream.
30 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
32 public abstract class ExternalMp3Decoder extends ExternalFilter {
35 public Format format() {
36 return super.format().encoding("PCM");
40 public void connect(Source source) throws ConnectException {
41 checkNotNull(source, "source must not be null");
42 checkState(source.format().encoding().equalsIgnoreCase("MP3"), "source must be MP3-encoded");
44 super.connect(source);