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The JAVE (Java Audio Video Encoder) library is Java wrapper on the ffmpeg project. Developers can take take advantage of JAVE2 to transcode audio and video files from a format to another. In example you can transcode an AVI file to a MPEG one, you can change a DivX video stream into a (youtube like) Flash FLV one, you can convert a WAV audio file to a MP3 or a Ogg Vorbis one, you can separate and transcode audio and video tracks, you can resize videos, changing their sizes and proportions and so on. Many other formats, containers and operations are supported by JAVE2.

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/*
 * JAVE - A Java Audio/Video Encoder (based on FFMPEG)
 * 
 * Copyright (C) 2008-2009 Carlo Pelliccia (www.sauronsoftware.it)
 * 
 * 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 .
 */
package ws.schild.jave;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;
import java.util.ArrayList;

/**
 * A package-private utility extending java.io.BufferedReader. If a line read
 * with {@link RBufferedReader#readLine()} is not useful for the calling code,
 * it can be re-inserted in the stream. The same line will be returned again at
 * the next readLine() call.
 *
 * @author Carlo Pelliccia
 */
class RBufferedReader extends BufferedReader {

    /**
     * Re-inserted lines buffer.
     */
    private final ArrayList lines = new ArrayList<>();

    /**
     * It builds the reader.
     *
     * @param in The underlying reader.
     */
    public RBufferedReader(Reader in) {
        super(in);
    }

    /**
     * It returns the next line in the stream.
     */
    @Override
    public String readLine() throws IOException {
        if (lines.size() > 0)
        {
            return lines.remove(0);
        } else
        {
            return super.readLine();
        }
    }

    /**
     * Reinserts a line in the stream. The line will be returned at the next
     * {@link RBufferedReader#readLine()} call.
     *
     * @param line The line.
     */
    public void reinsertLine(String line) {
        lines.add(0, line);
    }

}