Add LAME MP3 decoder.

diff --git a/src/main/java/net/pterodactylus/sonitus/data/filter/LameMp3Decoder.java b/src/main/java/net/pterodactylus/sonitus/data/filter/LameMp3Decoder.java
new file mode 100644 (file)
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+++ b/src/main/java/net/pterodactylus/sonitus/data/filter/LameMp3Decoder.java
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+/*
+ * Sonitus - LameMp3Decoder.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 com.google.common.collect.ImmutableList;
+
+/**
+ * {@link ExternalMp3Decoder} implementation that uses LAME to decode an MP3.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class LameMp3Decoder extends ExternalMp3Decoder {
+
+       /**
+        * Creates a new LAME MP3 decoder.
+        *
+        * @param binary
+        *              The location of the binary
+        * @param swapBytes
+        *              {@code true} to swap the decoded bytes, {@code false} to use platform
+        *              endianness
+        */
+       public LameMp3Decoder(String binary, boolean swapBytes) {
+               super(binary, generateParameters(swapBytes));
+       }
+
+       //
+       // STATIC METHODS
+       //
+
+       /**
+        * Generates the parameters for LAME.
+        *
+        * @param swapBytes
+        *              {@code true} to swap the decoded bytes, {@code false} to use platform
+        *              endianness
+        * @return The parameters for LAME
+        */
+       private static Iterable<String> generateParameters(boolean swapBytes) {
+               ImmutableList.Builder parameters = ImmutableList.builder();
+               parameters.add("--mp3input").add("--decode").add("-t");
+               if (swapBytes) {
+                       parameters.add("-x");
+               }
+               parameters.add("-").add("-");
+               return parameters.build();
+       }
+
+}