2 * Sonitus - TimeCounterFilter.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 java.io.IOException;
21 import java.util.concurrent.atomic.AtomicLong;
23 import net.pterodactylus.sonitus.data.Filter;
24 import net.pterodactylus.sonitus.data.Metadata;
27 * {@link Filter} implementation that uses the number of bytes that have been
28 * {@link #process(byte[]) processed} together with the {@link Metadata} to
29 * calculate how long a source is already playing.
31 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
33 public class TimeCounterFilter extends DummyFilter {
35 /** The byte counter. */
36 private final AtomicLong counter = new AtomicLong();
38 /** Whether to reset the counter on a metadata update. */
39 private final boolean resetOnMetadataUpdate;
42 * Creates a new time counter filter that automatically resets the counter when
43 * the metadata is {@link #metadataUpdated(Metadata) updated}.
46 * The name of the filter
48 public TimeCounterFilter(String name) {
53 * Creates a new time counter filter.
56 * The name of the filter
57 * @param resetOnMetadataUpdate
58 * {@code true} if the counter should automatically be reset if the metadata
59 * is updated, {@code false} otherwise
61 public TimeCounterFilter(String name, boolean resetOnMetadataUpdate) {
63 this.resetOnMetadataUpdate = resetOnMetadataUpdate;
71 * Returns the number of milliseconds worth of data that has been passed into
72 * {@link #process(byte[])}. If no metadata has yet been set, {@code 0} is
75 * @return The number of milliseconds the current source is already playing
77 public long getMillis() {
78 Metadata metadata = super.metadata();
79 if (metadata == null) {
82 return 1000 * counter.get() / (metadata.channels() * metadata.frequency() * 2);
85 /** Resets the counter to 0. */
91 // DUMMYFILTER METHODS
95 public void metadataUpdated(Metadata metadata) {
96 super.metadataUpdated(metadata);
97 if (resetOnMetadataUpdate) {
103 public void process(byte[] buffer) throws IOException {
104 super.process(buffer);
105 counter.getAndAdd(buffer.length);