Add Ogg Vorbis decoder.

diff --git a/src/main/java/net/pterodactylus/sonitus/data/filter/OggVorbisDecoder.java b/src/main/java/net/pterodactylus/sonitus/data/filter/OggVorbisDecoder.java
new file mode 100644 (file)
index 0000000..df1e2f1
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sonitus/data/filter/OggVorbisDecoder.java
@@ -0,0 +1,101 @@
+/*
+ * Sonitus - OggVorbisDecoder.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 net.pterodactylus.sonitus.data.ConnectException;
+import net.pterodactylus.sonitus.data.Metadata;
+import net.pterodactylus.sonitus.data.Source;
+
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+
+/**
+ * Ogg Vorbis decoder that uses {@code oggdec} (from the {@code vorbis-tools}
+ * package) to decode the Ogg Vorbis stream.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class OggVorbisDecoder extends ExternalFilter {
+
+       /** The location of the binary. */
+       private final String binary;
+
+       /** Whether to swap bytes. */
+       private boolean swapBytes;
+
+       /**
+        * Creates a new Ogg Vorbis decoder.
+        *
+        * @param binary
+        *              The location of the binary
+        */
+       public OggVorbisDecoder(String binary) {
+               this.binary = binary;
+       }
+
+       /**
+        * Sets whether to swap bytes on the decoded output.
+        *
+        * @param swapBytes
+        *              {@code true} to swap bytes on the decoded output, {@code false} otherwise
+        * @return This Ogg Vorbis decoder
+        */
+       public OggVorbisDecoder swapBytes(boolean swapBytes) {
+               this.swapBytes = swapBytes;
+               return this;
+       }
+
+       //
+       // FILTER METHODS
+       //
+
+       @Override
+       public Metadata metadata() {
+               return super.metadata().encoding("PCM");
+       }
+
+       @Override
+       public void connect(Source source) throws ConnectException {
+               Preconditions.checkNotNull(source, "source must not be null");
+               Preconditions.checkArgument(source.metadata().encoding().equalsIgnoreCase("Vorbis"), "source must be Vorbis-encoded");
+
+               super.connect(source);
+       }
+
+       //
+       // EXTERNALFILTER METHODS
+       //
+
+       @Override
+       protected String binary(Metadata metadata) {
+               return binary;
+       }
+
+       @Override
+       protected Iterable<String> parameters(Metadata metadata) {
+               ImmutableList.Builder parameters = ImmutableList.builder();
+               parameters.add("-R");
+               if (swapBytes) {
+                       parameters.add("-e").add("1");
+               }
+               parameters.add("-o").add("-");
+               parameters.add("-");
+               return parameters.build();
+       }
+
+}