From 1b183e7fa693e39c6033d9a49cb5da5e5ad6d500 Mon Sep 17 00:00:00 2001
From: =?utf8?q?David=20=E2=80=98Bombe=E2=80=99=20Roden?=
 <bombe@pterodactylus.net>
Date: Mon, 27 May 2013 11:39:55 +0200
Subject: [PATCH] Add volume filter.

---
 .../sonitus/data/filter/VolumeFilter.java          | 79 ++++++++++++++++++++++
 1 file changed, 79 insertions(+)
 create mode 100644 src/main/java/net/pterodactylus/sonitus/data/filter/VolumeFilter.java

diff --git a/src/main/java/net/pterodactylus/sonitus/data/filter/VolumeFilter.java b/src/main/java/net/pterodactylus/sonitus/data/filter/VolumeFilter.java
new file mode 100644
index 0000000..702594a
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/filter/VolumeFilter.java
@@ -0,0 +1,79 @@
+/*
+ * Sonitus - VolumeFilter.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.util.Arrays;
+import java.util.List;
+
+import net.pterodactylus.sonitus.data.Controller;
+import net.pterodactylus.sonitus.data.Filter;
+import net.pterodactylus.sonitus.data.controller.Fader;
+import net.pterodactylus.sonitus.data.controller.Switch;
+
+import com.google.common.eventbus.EventBus;
+
+/**
+ * Internal {@link Filter} implementation that can reduce the volume of the
+ * signal.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class VolumeFilter extends AudioProcessingFilter {
+
+	/** The volume fader. */
+	private final Fader volumeFader;
+
+	/** The mute switch. */
+	private final Switch muteSwitch;
+
+	/**
+	 * Creates a new volume filter.
+	 *
+	 * @param eventBus
+	 * 		The event bus
+	 */
+	public VolumeFilter(EventBus eventBus) {
+		super(eventBus, "Volume");
+		volumeFader = new Fader("Volume", 1.0);
+		muteSwitch = new Switch("Mute", false);
+	}
+
+	//
+	// CONTROLLED METHODS
+	//
+
+	@Override
+	public List<Controller<?>> controllers() {
+		return Arrays.<Controller<?>>asList(volumeFader, muteSwitch);
+	}
+
+	//
+	// AUDIOPROCESSINGFILTER METHODS
+	//
+
+	@Override
+	protected int[] processSamples(int[] samples) {
+		int[] processedSamples = new int[samples.length];
+		double volumeFactor = volumeFader.value();
+		for (int channel = 0; channel < samples.length; ++channel) {
+			processedSamples[channel] = muteSwitch.value() ? 0 : (int) (samples[channel] * volumeFactor);
+		}
+		return processedSamples;
+	}
+
+}
-- 
2.7.4