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;
22 import java.util.concurrent.atomic.AtomicReference;
24 import net.pterodactylus.sonitus.data.AbstractFilter;
25 import net.pterodactylus.sonitus.data.DataPacket;
26 import net.pterodactylus.sonitus.data.Filter;
27 import net.pterodactylus.sonitus.data.Metadata;
30 * {@link Filter} implementation that uses the number of bytes that have been
31 * {@link #process(DataPacket) processed} together with the {@link Metadata} to
32 * calculate how long a source is already playing.
34 * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
36 public class TimeCounterFilter extends AbstractFilter implements Filter {
38 /** The byte counter. */
39 private final AtomicLong counter = new AtomicLong();
41 /** The parent’s metdata. */
42 private final AtomicReference<Metadata> parentMetadata = new AtomicReference<Metadata>();
44 /** Whether to reset the counter on a metadata update. */
45 private final boolean resetOnMetadataUpdate;
47 /** The last displayed timestamp. */
48 private final AtomicLong lastTimestamp = new AtomicLong(-1);
51 * Creates a new time counter filter that automatically resets the counter when
52 * the metadata is {@link #metadataUpdated(Metadata) updated}.
55 * The name of the filter
57 public TimeCounterFilter(String name) {
62 * Creates a new time counter filter.
65 * The name of the filter
66 * @param resetOnMetadataUpdate
67 * {@code true} if the counter should automatically be reset if the metadata
68 * is updated, {@code false} otherwise
70 public TimeCounterFilter(String name, boolean resetOnMetadataUpdate) {
72 this.resetOnMetadataUpdate = resetOnMetadataUpdate;
80 * Returns the number of milliseconds worth of data that has been passed into
81 * {@link #process(DataPacket)}. If no metadata has yet been set, {@code 0} is
84 * @return The number of milliseconds the current source is already playing
86 public long getMillis() {
87 Metadata metadata = super.metadata();
88 if (metadata == null) {
91 return 1000 * counter.get() / (metadata.channels() * metadata.frequency() * 2);
94 /** Resets the counter to 0. */
104 public void metadataUpdated(Metadata metadata) {
105 parentMetadata.set(metadata);
106 if (resetOnMetadataUpdate) {
109 updateTimestamp(true);
113 public void process(DataPacket dataPacket) throws IOException {
114 super.process(dataPacket);
115 counter.getAndAdd(dataPacket.buffer().length);
116 updateTimestamp(false);
123 /** Updates the timestamp in the metadata. */
124 private void updateTimestamp(boolean now) {
125 long timestamp = getMillis() / 1000;
126 if (now || (lastTimestamp.get() != timestamp)) {
127 super.metadataUpdated(parentMetadata.get().comment(String.format("%s%02d:%02d", (timestamp >= 3600) ? String.format("%d:", timestamp / 3600) : "" , (timestamp % 3600) / 60, timestamp % 60)));
128 lastTimestamp.set(timestamp);