From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Sun, 17 Mar 2013 10:01:29 +0000 (+0100)
Subject: Add Ogg Vorbis decoder.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;h=232733212d941b29fdaa0b1db134f9e8d6dcbcee;p=sonitus.git

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
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();
+	}
+
+}