org.yestech.multimedia.video.mpeg4.audio.MP3AudioPlayer Maven / Gradle / Ivy

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/*
 * Copyright LGPL3
 * YES Technology Association
 * http://yestech.org
 *
 * http://www.opensource.org/licenses/lgpl-3.0.html
 */
package org.yestech.multimedia.video.mpeg4.audio;

import javazoom.jlme.decoder.Header;
import javazoom.jlme.decoder.Decoder;
import javazoom.jlme.decoder.BitStream;
import javazoom.jlme.decoder.SampleBuffer;

import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;


/**
 * The MP3AudioPlayer class realizes an audio player that plays the MP3 audio binary stream.
 * It uses the external MP3 library to decode the audio binary stream into the array of audio samples,
 * which plays through the available audio device (Java2 Sound API or Java1 compatible audio device).
 */
public final class MP3AudioPlayer extends AudioPlayer implements Runnable {

    /**
     * The input audio binary stream.
     */
    private BitStream bitstream;

    /**
     * Constructs an MP3AudioPlayer object using specified audio data input stream.
     *
     * @param is audio data input stream.
     * @throws Exception raises if there is an error occurs
     *                   (in most cases if no output audio devices have been found).
     */
    public MP3AudioPlayer(InputStream is) throws Exception {
        super();
        bitstream = new BitStream(is);
        audioPlayerThread = new Thread(this, "Audio Player Thread");
        audioPlayerThread.start();
    }

    /**
     * Decodes the audio binary stream using the external MP3 library into the array of audio samples,
     * which plays through the available audio device.
     */
    public void run() {
        try {
            Header header = null;
            Decoder decoder = null;
            while ((audioPlayerThread != null) && ((header = bitstream.readFrame()) != null)) {
                if (decoder == null) {
                    decoder = new Decoder(header, bitstream);
                    System.out.println("Audio: MPEG " + ((header.version() == Header.MPEG1) ? "1" : "2") + " LAYER " + header.layer() + ' ' + header.frequency() + " kHz " + Header.bitrate_str[header.version()][header.layer() - 1][header.bitrate_index()] + " " + header.mode_string());
                }
                SampleBuffer sampleBuffer = decoder.decodeFrame();
                if (!audioDevice.isOpened()) {
                    audioDevice.open(sampleBuffer.getSampleFrequency(), sampleBuffer.getChannelCount());
                }
                if (!readyToPlay && audioDevice.isReady()) {
                    synchronized (this) {
                        readyToPlay = true;
                        notifyAll();
                    }
                }
                if (sampleBuffer.size() > 0) {
                    audioDevice.write(sampleBuffer.getBuffer(), sampleBuffer.size());
                }
                bitstream.closeFrame();
            }
        } catch (InterruptedIOException ioex) {
        } catch (EOFException ex) {
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            decoding = false;
            readyToPlay = true;
            audioPlayerThread = null;
        }
        System.out.println("Audio Stream has terminated");
	}
}