Add volume filter.

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 (file)
index 0000000..702594a
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+++ 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;
+       }
+
+}