FLACEncoder.java

/*
 * Copyright (c) 2008, 2009, 2010, 2011 Denis Tulskiy
 *
 * This program 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 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with this work.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.tulskiy.musique.audio.formats.flac;

import com.tulskiy.musique.audio.Encoder;
import com.tulskiy.musique.system.configuration.Configuration;
import com.tulskiy.musique.util.AudioMath;
import javaFlacEncoder.EncodingConfiguration;
import javaFlacEncoder.FLACFileOutputStream;
import javaFlacEncoder.StreamConfiguration;

import javax.sound.sampled.AudioFormat;
import java.io.File;
import java.io.IOException;

/**
 * Author: Denis Tulskiy
 * Date: 5/28/11
 */
public class FLACEncoder implements Encoder {

    private javaFlacEncoder.FLACEncoder encoder;
    private FLACFileOutputStream outputStream;
    private int[] buffer = new int[65536];
    private AudioFormat fmt;
    private int unencodedSamples;

    @Override
    public boolean open(File outputFile, AudioFormat fmt, Configuration options) {
        try {
            this.fmt = fmt;
            encoder = new javaFlacEncoder.FLACEncoder();
            StreamConfiguration streamConfiguration = new StreamConfiguration();
            streamConfiguration.setBitsPerSample(fmt.getSampleSizeInBits());
            streamConfiguration.setChannelCount(fmt.getChannels());
            streamConfiguration.setSampleRate((int) fmt.getSampleRate());
            encoder.setStreamConfiguration(streamConfiguration);

            EncodingConfiguration encodingConfiguration = new EncodingConfiguration();
            encoder.setEncodingConfiguration(encodingConfiguration);

            outputStream = new FLACFileOutputStream(outputFile.getAbsolutePath());
            encoder.setOutputStream(outputStream);
            encoder.openFLACStream();
            unencodedSamples = 0;
            return true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public void encode(byte[] buf, int len) {
        try {
            int length = AudioMath.convertBuffer(buf, buffer, len, fmt);
            int samples = length / fmt.getChannels();
            encoder.addSamples(buffer, samples);
            unencodedSamples += samples;
            unencodedSamples -= encoder.encodeSamples(unencodedSamples, false);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void close() {
        try {
            encoder.encodeSamples(unencodedSamples, true);
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}