jlibsound/src/main/java/old/Converter.java

package old;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javazoom.jl.decoder.Bitstream;
import javazoom.jl.decoder.BitstreamException;
import sound.util.Utils;
import base.exception.worker.ActivateException;
import base.exception.worker.DeactivateException;
import base.work.Work;

import com.Ostermiller.util.CircularByteBuffer;

public class Converter extends Work {
    public static final String COMMAND = "lame --mp3input --cbr %s - - --quiet";
    public static final int BYTES = 4096;     // bytes
    public static final int BUFFER = 30000;   // milliseconds
    public static final int BUFFERING = 1000; // milliseconds

    protected int targetRate;
    protected int rate;
    protected int buffer;
    protected boolean convert;

    protected Process process;
    protected InputStream sourceInputStream, processInputStream, inputStream;
    protected OutputStream processOutputStream;
    protected CircularByteBuffer circularByteBuffer;
    protected BufferWorker bufferWorker;

    public Converter(InputStream inputStream) {
        this(inputStream, -1);        
    }

    public Converter(InputStream inputStream, int targetRate) {
        super();
        this.sourceInputStream = inputStream;
        this.targetRate = targetRate;
        bufferWorker = new BufferWorker();
        convert = false;
    }
    
    public void exit() {
        super.exit();
        bufferWorker.exit();
    }

    public synchronized void activate() throws ActivateException {
        /* Read bitrate */
        BufferedInputStream bufferedInputStream = new BufferedInputStream(sourceInputStream);
        Bitstream bitStream = new Bitstream(bufferedInputStream);
        try {
            rate = bitStream.readFrame().bitrate() / 1000;
            buffer = BUFFER * rate / 8;
        } catch (BitstreamException e) {
            logger.error("", e);
            throw new ActivateException();
        }

        /* Check for need to convert */
        if (targetRate < 0 || rate == targetRate) {
            logger.debug("No conversion required");
            inputStream = sourceInputStream;
        } else {
            logger.debug("Converting from " + rate + "kbps to " + targetRate + "kbps");
            try {
                String command = String.format(COMMAND, rate > targetRate ? "-B " + targetRate : "-F -b " + targetRate);
                logger.debug("Starting process: " + command);
                process = Runtime.getRuntime().exec(command);
                processInputStream = process.getInputStream();
                processOutputStream = process.getOutputStream();

                /* Buffer output */
                circularByteBuffer = new CircularByteBuffer(CircularByteBuffer.INFINITE_SIZE);
                inputStream = circularByteBuffer.getInputStream();
                bufferWorker.start();
                convert = true;
            } catch (IOException e) {
                logger.error("", e);
                throw new ActivateException();
            }
        }
        super.activate();
        notifyAll();
    }

    public void deactivate() throws DeactivateException {
        super.deactivate();
        try {
            sourceInputStream.close();
            bufferWorker.stop();
            if (convert) {
                circularByteBuffer.clear();
                convert = false;
            }
            inputStream.close();
        } catch (IOException e) {
            logger.error("", e);
            throw new DeactivateException();
        }
    }

    public void work() {
        if (!convert) {
            try {
                synchronized (this) {
                    wait();
                }
            } catch (InterruptedException e) {
                logger.error("", e);
            }
            return;
        }
        byte[] bytes = new byte[BYTES];
        int read = 0;
        try {
            logger.debug("Writing input to process");
            // Should be interrupted by stop()/exit()
            while ((read = sourceInputStream.read(bytes)) > 0) {
                /* Limit buffer size */
                while (inputStream.available() > buffer) {
                      int progress = (int) ((1 - (inputStream.available() - buffer) / (float) buffer) * 100);
                    logger.trace("Waiting for buffer to empty: " + progress + "%");
                    sleep(BUFFERING);
                }
                processOutputStream.write(bytes, 0, read);
            }
            processOutputStream.close();
            logger.debug("Stopped writing input to process");
            process.waitFor();
            logger.debug("Process finished");
        } catch (IOException e) {
        } catch (InterruptedException e) {
            logger.error("", e);
        }
        stop();
    }

    public synchronized InputStream getInputStream() {
        if (!active()) {
            start();
            try {
                wait();
            } catch (InterruptedException e) {
                logger.error("", e);
            }
        }
        return inputStream;
    }

    public synchronized void setInputStream(InputStream inputStream) {
        this.inputStream = inputStream;    
    }

    class BufferWorker extends Work {
        public void work() {
            byte[] bytes = new byte[BYTES];
            int read = 0;
            try {
                OutputStream bufferOutputStream = circularByteBuffer.getOutputStream();
                logger.debug("Start buffering process output");
                while ((read = processInputStream.read(bytes, 0, BYTES)) > 0) {
                    bufferOutputStream.write(bytes, 0, read);
                }
                logger.debug("Finished buffering process output");
                bufferOutputStream.close();
            } catch (IOException e) {}
            stop();
        }
    }

    public static void main(String[] args) {
        Mp3 mp3 = new Mp3(new File("stream.mp3"), 128);
        InputStream inputStream = mp3.getInputStream();

        /* Play */
        //Utils.play(inputStream);

        /* Write to file */
        Utils.write(inputStream, new File("output.mp3"));
        mp3.exit();
    }
}