Fixed mp3 playing, refactored to avoid duplicating code.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@153 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/openal/FileStream.java

@@ -0,0 +1,165 @@
+//
+// $Id: OggFileStream.java 119 2007-01-24 00:22:12Z dhoover $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2005 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library 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
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.openal;
+
+import java.util.HashMap;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import java.nio.ByteBuffer;
+
+import java.util.ArrayList;
+
+import org.lwjgl.openal.AL10;
+
+/**
+ * An audio stream read from one or more files.
+ */
+public class FileStream extends Stream
+{
+    /**
+     * Registers a class of {@link StreamDecoder} for the specified file extension.
+     */
+    public static void registerExtension (String extension, Class clazz)
+    {
+        _extensions.put(extension, clazz);
+    }
+
+    /**
+     * Creates a new stream for the specified file.
+     *
+     * @param loop whether or not to play the file in a continuous loop
+     * if there's nothing on the queue
+     */
+    public FileStream (SoundManager soundmgr, File file, boolean loop)
+        throws IOException
+    {
+        super(soundmgr);
+        _file = new QueuedFile(file, loop);
+        _decoder = createDecoder(file);
+    }
+
+    /**
+     * Adds a file to the queue of files to play.
+     *
+     * @param loop if true, play this file in a loop if there's nothing else
+     * on the queue
+     */
+    public void queueFile (File file, boolean loop)
+    {
+        _queue.add(new QueuedFile(file, loop));
+    }
+
+    // documentation inherited
+    protected int getFormat ()
+    {
+        return _decoder.getFormat();
+    }
+
+    // documentation inherited
+    protected int getFrequency ()
+    {
+        return _decoder.getFrequency();
+    }
+
+    // documentation inherited
+    protected int populateBuffer (ByteBuffer buf)
+        throws IOException
+    {
+        int read = _decoder.read(buf);
+        while (buf.hasRemaining() && (!_queue.isEmpty() || _file.loop)) {
+            if (!_queue.isEmpty()) {
+                _file = _queue.remove(0);
+            }
+            _decoder = createDecoder(_file.file);
+            read = Math.max(0, read);
+            read += _decoder.read(buf);
+        }
+        return read;
+    }
+
+    /**
+     * Creates and initializes a stream decoder for the specified file.
+     */
+    protected StreamDecoder createDecoder (File file)
+        throws IOException
+    {
+        String path = file.getPath();
+        int idx = path.lastIndexOf('.');
+        if (idx == -1) {
+            Log.warning("Missing extension for file [file=" + path + "].");
+            return null;
+        }
+        String extension = path.substring(idx+1);
+        Class clazz = _extensions.get(extension);
+        if (clazz == null) {
+            Log.warning("No decoder registered for extension [extension=" + extension +
+                ", file=" + path + "].");
+            return null;
+        }
+        StreamDecoder decoder;
+        try {
+            decoder = (StreamDecoder)clazz.newInstance();
+        } catch (Exception e) {
+            Log.warning("Error instantiating decoder [file=" + path + ", error=" + e + "].");
+            return null;
+        }
+        decoder.init(new FileInputStream(file));
+        return decoder;
+    }
+
+    /** The file currently being played. */
+    protected QueuedFile _file;
+
+    /** The stream decoder for the current file. */
+    protected StreamDecoder _decoder;
+
+    /** The queue of files to play after the current one. */
+    protected ArrayList<QueuedFile> _queue = new ArrayList<QueuedFile>();
+
+    /** A file queued for play. */
+    protected class QueuedFile
+    {
+        /** The file to play. */
+        public File file;
+
+        /** Whether or not to play the file in a loop when there's nothing
+         * in the queue. */
+        public boolean loop;
+
+        public QueuedFile (File file, boolean loop)
+        {
+            this.file = file;
+            this.loop = loop;
+        }
+    }
+
+    /** Registered decoder classes. */
+    protected static HashMap<String, Class> _extensions = new HashMap<String, Class>();
+    static {
+        registerExtension("ogg", OggStreamDecoder.class);
+        registerExtension("mp3", Mp3StreamDecoder.class);
+    }
+}