From beffc0e31783f17abdd68caede40856ff9fc1778 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Fri, 24 May 2013 23:20:37 +0200
Subject: [PATCH] Add filter that tracks the time.

---
 .../sonitus/data/filter/TimeCounterFilter.java     | 102 +++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/sonitus/data/filter/TimeCounterFilter.java

diff --git a/src/main/java/net/pterodactylus/sonitus/data/filter/TimeCounterFilter.java b/src/main/java/net/pterodactylus/sonitus/data/filter/TimeCounterFilter.java
new file mode 100644
index 0000000..3bb4415
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/filter/TimeCounterFilter.java
@@ -0,0 +1,102 @@
+/*
+ * Sonitus - TimeCounterFilter.java - Copyright © 2013 David Roden
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sonitus.data.filter;
+
+import java.io.IOException;
+import java.util.concurrent.atomic.AtomicLong;
+
+import net.pterodactylus.sonitus.data.Filter;
+import net.pterodactylus.sonitus.data.Metadata;
+
+/**
+ * {@link Filter} implementation that uses the number of bytes that have been
+ * {@link #process(byte[]) processed} together with the {@link Metadata} to
+ * calculate how long a source is already playing.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class TimeCounterFilter extends DummyFilter {
+
+	/** The byte counter. */
+	private final AtomicLong counter = new AtomicLong();
+
+	/** Whether to reset the counter on a metadata update. */
+	private final boolean resetOnMetadataUpdate;
+
+	/**
+	 * Creates a new time counter filter that automatically resets the counter when
+	 * the metadata is {@link #metadataUpdated(Metadata) updated}.
+	 */
+	public TimeCounterFilter() {
+		this(true);
+	}
+
+	/**
+	 * Creates a new time counter filter.
+	 *
+	 * @param resetOnMetadataUpdate
+	 * 		{@code true} if the counter should automatically be reset if the metadata
+	 * 		is updated, {@code false} otherwise
+	 */
+	public TimeCounterFilter(boolean resetOnMetadataUpdate) {
+		this.resetOnMetadataUpdate = resetOnMetadataUpdate;
+	}
+
+	//
+	// ACTIONS
+	//
+
+	/**
+	 * Returns the number of milliseconds worth of data that has been passed into
+	 * {@link #process(byte[])}. If no metadata has yet been set, {@code 0} is
+	 * returned.
+	 *
+	 * @return The number of milliseconds the current source is already playing
+	 */
+	public long getMillis() {
+		Metadata metadata = super.metadata();
+		if (metadata == null) {
+			return 0;
+		}
+		return 1000 * counter.get() / (metadata.channels() * metadata.frequency() * 2);
+	}
+
+	/** Resets the counter to 0. */
+	public void reset() {
+		counter.set(0);
+	}
+
+	//
+	// DUMMYFILTER METHODS
+	//
+
+	@Override
+	public void metadataUpdated(Metadata metadata) {
+		super.metadataUpdated(metadata);
+		if (resetOnMetadataUpdate) {
+			reset();
+		}
+	}
+
+	@Override
+	public void process(byte[] buffer) throws IOException {
+		super.process(buffer);
+		counter.getAndAdd(buffer.length);
+	}
+
+}
-- 
2.7.4