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.checkNotNull;
21 import static com.google.inject.internal.util.$Preconditions.checkState;
23 import java.io.IOException;
25 import net.pterodactylus.sonitus.data.Metadata;
27 import com.google.common.eventbus.EventBus;
30 * Basic {@link net.pterodactylus.sonitus.data.filter.ExternalFilter}
31 * implementation that verifies that the connected source is MP3-encoded and
32 * returns a PCM-encoded stream.
34 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
36 public abstract class ExternalMp3Decoder extends ExternalFilter {
39 * Creates a new external MP3 decoder.
44 * The name of the filter
46 protected ExternalMp3Decoder(EventBus eventBus, String name) {
47 super(eventBus, name);
51 public Metadata metadata() {
52 return super.metadata().encoding("PCM");
56 public void open(Metadata metadata) throws IOException {
57 checkNotNull(metadata, "metadata must not be null");
58 checkState(metadata.encoding().equalsIgnoreCase("MP3"), "source must be MP3-encoded");