DefaultFFMPEGLocator.java

/*
 * 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 <http://www.gnu.org/licenses/>.
 */
package it.sauronsoftware.jave;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;

/**
 * The default ffmpeg executable locator, which exports on disk the ffmpeg
 * executable bundled with the library distributions. It should work both for
 * windows and many linux distributions. If it doesn't, try compiling your own
 * ffmpeg executable and plug it in JAVE with a custom {@link FFMPEGLocator}.
 *
 * @author Carlo Pelliccia
 */
public class DefaultFFMPEGLocator extends FFMPEGLocator {

    /**
     * Trace the version of the bundled ffmpeg executable. It's a counter: every
     * time the bundled ffmpeg change it is incremented by 1.
     */
    private static final int myEXEversion = 1;

    /**
     * The ffmpeg executable file path.
     */
    private String path;

    /**
     * It builds the default FFMPEGLocator, exporting the ffmpeg executable on a
     * temp file.
     */
    public DefaultFFMPEGLocator() {
        // Windows?
        String os = System.getProperty( "os.name" ).toLowerCase();
        boolean isWindows = os.contains( "windows" );
        // Temp dir?
        File temp = new File( System.getProperty( "java.io.tmpdir" ), "jave-" + myEXEversion );
        if ( !temp.exists() ) {
            temp.mkdirs();
            temp.deleteOnExit();
        }
        // ffmpeg executable export on disk.
        String suffix = isWindows ? ".exe" : "";
        File exe = new File( temp, "ffmpeg" + suffix );
        copyFile( "ffmpeg" + suffix, exe );
        if ( isWindows ) {
            File dll = new File( temp, "pthreadGC2.dll" );
            copyFile( "pthreadGC2.dll", dll );
        }
        else {
            Runtime runtime = Runtime.getRuntime();
            try {
                runtime.exec( new String[] { "/bin/chmod", "755",
                 exe.getAbsolutePath() } );
            }
            catch ( IOException e ) {
                e.printStackTrace();
            }
        }
        // Ok.
        this.path = exe.getAbsolutePath();
    }

    protected String getFFMPEGExecutablePath() {
        return path;
    }

    /**
     * Copies a file bundled in the package to the supplied destination.
     *
     * @param path The name of the bundled file.
     * @param dest The destination.
     * @throws RuntimeException If aun unexpected error occurs.
     */
    private void copyFile( String path, File dest ) throws RuntimeException {
        try {
            FileUtils.copyInputStreamToFile( Thread.currentThread().getContextClassLoader().getResourceAsStream( path ), dest );
        }
        catch ( IOException e ) {
            throw new RuntimeException( "Cannot write file " + dest.getAbsolutePath() );
        }
    }

}