// Wav file IO class
// A.Greensted
// http://www.labbookpages.co.uk

// File format is based on the information from
// http://www.sonicspot.com/guide/wavefiles.html
// http://www.blitter.com/~russtopia/MIDI/~jglatt/tech/wave.htm

// Version 1.0

sclass GSWavFile implements AutoCloseable { // GS for Greensted...
  private enum IOState {READING, WRITING, CLOSED};
  private final static int BUFFER_SIZE = 4096;

  private final static int FMT_CHUNK_ID = 0x20746D66;
  private final static int DATA_CHUNK_ID = 0x61746164;
  private final static int RIFF_CHUNK_ID = 0x46464952;
  private final static int RIFF_TYPE_ID = 0x45564157;

  private File file;            // File that will be read from or written to
  private IOState ioState;        // Specifies the IO State of the Wav File (used for snaity checking)
  private int bytesPerSample;     // Number of bytes required to store a single sample
  private long numFrames;         // Number of frames within the data section
  private OutputStream oStream; // Output stream used for writting data
  private FileInputStream iStream;    // Input stream used for reading data
  private double floatScale;        // Scaling factor used for int <-> float conversion       
  private double floatOffset;     // Offset factor used for int <-> float conversion        
  private boolean wordAlignAdjust;    // Specify if an extra byte at the end of the data chunk is required for word alignment

  // Wav Header
  private int numChannels;        // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
  private long sampleRate;        // 4 bytes unsigned, 0x00000001 (1) to 0xFFFFFFFF (4,294,967,295)
                          // Although a java int is 4 bytes, it is signed, so need to use a long
  private int blockAlign;         // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
  private int validBits;          // 2 bytes unsigned, 0x0002 (2) to 0xFFFF (65,535)

  // Buffering
  private byte[] buffer;          // Local buffer used for IO
  private int bufferPointer;        // Points to the current position in local buffer
  private int bytesRead;          // Bytes read after last read into local buffer
  private long frameCounter;        // Current number of frames read or written

  // Cannot instantiate GSWavFile directly, must either use newWavFile() or openWavFile()
  private GSWavFile()
  {
    buffer = new byte[BUFFER_SIZE];
  }

  public int getNumChannels()
  {
    return numChannels;
  }

  public long getNumFrames()
  {
    return numFrames;
  }

  public long getFramesRemaining()
  {
    return numFrames - frameCounter;
  }

  public long getSampleRate()
  {
    return sampleRate;
  }

  public int getValidBits()
  {
    return validBits;
  }

  public static GSWavFile newWavFile(File file, int numChannels, long numFrames, int validBits, long sampleRate) throws IOException {
    ret newWavFile(null, file, numChannels, numFrames, validBits, sampleRate);
  }
  
  public static GSWavFile newWavFile(OutputStream oStream, File file, int numChannels, long numFrames, int validBits, long sampleRate) throws IOException {
    // Instantiate new Wavfile and initialise
    GSWavFile wavFile = new GSWavFile();
    wavFile.file = file;
    wavFile.numChannels = numChannels;
    wavFile.numFrames = numFrames;
    wavFile.sampleRate = sampleRate;
    wavFile.bytesPerSample = (validBits + 7) / 8;
    wavFile.blockAlign = wavFile.bytesPerSample * numChannels;
    wavFile.validBits = validBits;

    // Sanity check arguments
    if (numChannels < 1 || numChannels > 65535) throw new RuntimeException("Illegal number of channels, valid range 1 to 65536");
    if (numFrames < 0) throw new RuntimeException("Number of frames must be positive");
    if (validBits < 2 || validBits > 65535) throw new RuntimeException("Illegal number of valid bits, valid range 2 to 65536");
    if (sampleRate < 0) throw new RuntimeException("Sample rate must be positive");

    // Create output stream for writing data
    wavFile.oStream = oStream != null ? oStream : new FileOutputStream(file);

    // Calculate the chunk sizes
    long dataChunkSize = wavFile.blockAlign * numFrames;
    long mainChunkSize =  4 + // Riff Type
                  8 + // Format ID and size
                  16 +  // Format data
                  8 +   // Data ID and size
                  dataChunkSize;

    // Chunks must be word aligned, so if odd number of audio data bytes
    // adjust the main chunk size
    if (dataChunkSize % 2 == 1) {
      mainChunkSize += 1;
      wavFile.wordAlignAdjust = true;
    }
    else {
      wavFile.wordAlignAdjust = false;
    }

    // Set the main chunk size
    putLE(RIFF_CHUNK_ID,  wavFile.buffer, 0, 4);
    putLE(mainChunkSize,  wavFile.buffer, 4, 4);
    putLE(RIFF_TYPE_ID, wavFile.buffer, 8, 4);

    // Write out the header
    wavFile.oStream.write(wavFile.buffer, 0, 12);

    // Put format data in buffer
    long averageBytesPerSecond = sampleRate * wavFile.blockAlign;

    putLE(FMT_CHUNK_ID,       wavFile.buffer, 0, 4);    // Chunk ID
    putLE(16,             wavFile.buffer, 4, 4);    // Chunk Data Size
    putLE(1,                wavFile.buffer, 8, 2);    // Compression Code (Uncompressed)
    putLE(numChannels,        wavFile.buffer, 10, 2);   // Number of channels
    putLE(sampleRate,         wavFile.buffer, 12, 4);   // Sample Rate
    putLE(averageBytesPerSecond,  wavFile.buffer, 16, 4);   // Average Bytes Per Second
    putLE(wavFile.blockAlign,   wavFile.buffer, 20, 2);   // Block Align
    putLE(validBits,          wavFile.buffer, 22, 2);   // Valid Bits

    // Write Format Chunk
    wavFile.oStream.write(wavFile.buffer, 0, 24);

    // Start Data Chunk
    putLE(DATA_CHUNK_ID,        wavFile.buffer, 0, 4);    // Chunk ID
    putLE(dataChunkSize,        wavFile.buffer, 4, 4);    // Chunk Data Size

    // Write Format Chunk
    wavFile.oStream.write(wavFile.buffer, 0, 8);

    // Calculate the scaling factor for converting to a normalised double
    if (wavFile.validBits > 8)
    {
      // If more than 8 validBits, data is signed
      // Conversion required multiplying by magnitude of max positive value
      wavFile.floatOffset = 0;
      wavFile.floatScale = Long.MAX_VALUE >> (64 - wavFile.validBits);
    }
    else
    {
      // Else if 8 or less validBits, data is unsigned
      // Conversion required dividing by max positive value
      wavFile.floatOffset = 1;
      wavFile.floatScale = 0.5 * ((1 << wavFile.validBits) - 1);
    }

    // Finally, set the IO State
    wavFile.bufferPointer = 0;
    wavFile.bytesRead = 0;
    wavFile.frameCounter = 0;
    wavFile.ioState = IOState.WRITING;

    return wavFile;
  }

  public static GSWavFile openWavFile(File file) throws IOException, RuntimeException
  {
    // Instantiate new Wavfile and store the file reference
    GSWavFile wavFile = new GSWavFile();
    wavFile.file = file;

    // Create a new file input stream for reading file data
    wavFile.iStream = new FileInputStream(file);

    // Read the first 12 bytes of the file
    int bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 12);
    if (bytesRead != 12) throw new RuntimeException("Not enough wav file bytes for header");

    // Extract parts from the header
    long riffChunkID = getLE(wavFile.buffer, 0, 4);
    long chunkSize = getLE(wavFile.buffer, 4, 4);
    long riffTypeID = getLE(wavFile.buffer, 8, 4);

    // Check the header bytes contains the correct signature
    if (riffChunkID != RIFF_CHUNK_ID) throw new RuntimeException("Invalid Wav Header data, incorrect riff chunk ID");
    if (riffTypeID != RIFF_TYPE_ID) throw new RuntimeException("Invalid Wav Header data, incorrect riff type ID");

    // Check that the file size matches the number of bytes listed in header
    if (file.length() != chunkSize+8) {
      throw new RuntimeException("Header chunk size (" + chunkSize + ") does not match file size (" + file.length() + ")");
    }

    boolean foundFormat = false;
    boolean foundData = false;

    // Search for the Format and Data Chunks
    while (true)
    {
      // Read the first 8 bytes of the chunk (ID and chunk size)
      bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 8);
      if (bytesRead == -1) throw new RuntimeException("Reached end of file without finding format chunk");
      if (bytesRead != 8) throw new RuntimeException("Could not read chunk header");

      // Extract the chunk ID and Size
      long chunkID = getLE(wavFile.buffer, 0, 4);
      chunkSize = getLE(wavFile.buffer, 4, 4);

      // Word align the chunk size
      // chunkSize specifies the number of bytes holding data. However,
      // the data should be word aligned (2 bytes) so we need to calculate
      // the actual number of bytes in the chunk
      long numChunkBytes = (chunkSize%2 == 1) ? chunkSize+1 : chunkSize;

      if (chunkID == FMT_CHUNK_ID)
      {
        // Flag that the format chunk has been found
        foundFormat = true;

        // Read in the header info
        bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 16);

        // Check this is uncompressed data
        int compressionCode = (int) getLE(wavFile.buffer, 0, 2);
        if (compressionCode != 1) throw new RuntimeException("Compression Code " + compressionCode + " not supported");

        // Extract the format information
        wavFile.numChannels = (int) getLE(wavFile.buffer, 2, 2);
        wavFile.sampleRate = getLE(wavFile.buffer, 4, 4);
        wavFile.blockAlign = (int) getLE(wavFile.buffer, 12, 2);
        wavFile.validBits = (int) getLE(wavFile.buffer, 14, 2);

        if (wavFile.numChannels == 0) throw new RuntimeException("Number of channels specified in header is equal to zero");
        if (wavFile.blockAlign == 0) throw new RuntimeException("Block Align specified in header is equal to zero");
        if (wavFile.validBits < 2) throw new RuntimeException("Valid Bits specified in header is less than 2");
        if (wavFile.validBits > 64) throw new RuntimeException("Valid Bits specified in header is greater than 64, this is greater than a long can hold");

        // Calculate the number of bytes required to hold 1 sample
        wavFile.bytesPerSample = (wavFile.validBits + 7) / 8;
        if (wavFile.bytesPerSample * wavFile.numChannels != wavFile.blockAlign)
          throw new RuntimeException("Block Align does not agree with bytes required for validBits and number of channels");

        // Account for number of format bytes and then skip over
        // any extra format bytes
        numChunkBytes -= 16;
        if (numChunkBytes > 0) wavFile.iStream.skip(numChunkBytes);
      }
      else if (chunkID == DATA_CHUNK_ID)
      {
        // Check if we've found the format chunk,
        // If not, throw an exception as we need the format information
        // before we can read the data chunk
        if (foundFormat == false) throw new RuntimeException("Data chunk found before Format chunk");

        // Check that the chunkSize (wav data length) is a multiple of the
        // block align (bytes per frame)
        if (chunkSize % wavFile.blockAlign != 0) throw new RuntimeException("Data Chunk size is not multiple of Block Align");

        // Calculate the number of frames
        wavFile.numFrames = chunkSize / wavFile.blockAlign;
        
        // Flag that we've found the wave data chunk
        foundData = true;

        break;
      }
      else
      {
        // If an unknown chunk ID is found, just skip over the chunk data
        wavFile.iStream.skip(numChunkBytes);
      }
    }

    // Throw an exception if no data chunk has been found
    if (foundData == false) throw new RuntimeException("Did not find a data chunk");

    // Calculate the scaling factor for converting to a normalised double
    if (wavFile.validBits > 8)
    {
      // If more than 8 validBits, data is signed
      // Conversion required dividing by magnitude of max negative value
      wavFile.floatOffset = 0;
      wavFile.floatScale = 1 << (wavFile.validBits - 1);
    }
    else
    {
      // Else if 8 or less validBits, data is unsigned
      // Conversion required dividing by max positive value
      wavFile.floatOffset = -1;
      wavFile.floatScale = 0.5 * ((1 << wavFile.validBits) - 1);
    }

    wavFile.bufferPointer = 0;
    wavFile.bytesRead = 0;
    wavFile.frameCounter = 0;
    wavFile.ioState = IOState.READING;

    return wavFile;
  }

  // Get and Put little endian data from local buffer
  // ------------------------------------------------
  private static long getLE(byte[] buffer, int pos, int numBytes)
  {
    numBytes --;
    pos += numBytes;

    long val = buffer[pos] & 0xFF;
    for (int b=0 ; b<numBytes ; b++) val = (val << 8) + (buffer[--pos] & 0xFF);

    return val;
  }

  private static void putLE(long val, byte[] buffer, int pos, int numBytes)
  {
    for (int b=0 ; b<numBytes ; b++)
    {
      buffer[pos] = (byte) (val & 0xFF);
      val >>= 8;
      pos ++;
    }
  }

  // Sample Writing and Reading
  // --------------------------
  private void writeSample(long val) throws IOException
  {
    for (int b=0 ; b<bytesPerSample ; b++)
    {
      if (bufferPointer == BUFFER_SIZE)
      {
        oStream.write(buffer, 0, BUFFER_SIZE);
        bufferPointer = 0;
      }

      buffer[bufferPointer] = (byte) (val & 0xFF);
      val >>= 8;
      bufferPointer ++;
    }
  }

  private long readSample() throws IOException, RuntimeException
  {
    long val = 0;

    for (int b=0 ; b<bytesPerSample ; b++)
    {
      if (bufferPointer == bytesRead) 
      {
        int read = iStream.read(buffer, 0, BUFFER_SIZE);
        if (read == -1) throw new RuntimeException("Not enough data available");
        bytesRead = read;
        bufferPointer = 0;
      }

      int v = buffer[bufferPointer];
      if (b < bytesPerSample-1 || bytesPerSample == 1) v &= 0xFF;
      val += v << (b * 8);

      bufferPointer ++;
    }

    return val;
  }

  // Integer
  // -------
  public int readFrames(int[] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(int[] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        sampleBuffer[offset] = (int) readSample();
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int readFrames(int[][] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(int[][] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) sampleBuffer[c][offset] = (int) readSample();

      offset ++;
      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int writeFrames(int[] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(int[] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        writeSample(sampleBuffer[offset]);
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToWrite;
  }

  public int writeFrames(int[][] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(int[][] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) writeSample(sampleBuffer[c][offset]);

      offset ++;
      frameCounter ++;
    }

    return numFramesToWrite;
  }

  // Long
  // ----
  public int readFrames(long[] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(long[] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        sampleBuffer[offset] = readSample();
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int readFrames(long[][] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(long[][] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) sampleBuffer[c][offset] = readSample();

      offset ++;
      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int writeFrames(long[] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(long[] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        writeSample(sampleBuffer[offset]);
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToWrite;
  }

  public int writeFrames(long[][] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(long[][] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) writeSample(sampleBuffer[c][offset]);

      offset ++;
      frameCounter ++;
    }

    return numFramesToWrite;
  }

  // Double
  // ------
  public int readFrames(double[] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(double[] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        sampleBuffer[offset] = floatOffset + (double) readSample() / floatScale;
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int readFrames(double[][] sampleBuffer, int numFramesToRead) throws IOException, RuntimeException
  {
    return readFrames(sampleBuffer, 0, numFramesToRead);
  }

  public int readFrames(double[][] sampleBuffer, int offset, int numFramesToRead) throws IOException, RuntimeException
  {
    if (ioState != IOState.READING) throw new IOException("Cannot read from GSWavFile instance");

    for (int f=0 ; f<numFramesToRead ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) sampleBuffer[c][offset] = floatOffset + (double) readSample() / floatScale;

      offset ++;
      frameCounter ++;
    }

    return numFramesToRead;
  }

  public int writeFrames(double[] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(double[] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++)
      {
        writeSample((long) (floatScale * (floatOffset + sampleBuffer[offset])));
        offset ++;
      }

      frameCounter ++;
    }

    return numFramesToWrite;
  }

  public int writeFrames(double[][] sampleBuffer, int numFramesToWrite) throws IOException, RuntimeException
  {
    return writeFrames(sampleBuffer, 0, numFramesToWrite);
  }

  public int writeFrames(double[][] sampleBuffer, int offset, int numFramesToWrite) throws IOException, RuntimeException
  {
    if (ioState != IOState.WRITING) throw new IOException("Cannot write to GSWavFile instance");

    for (int f=0 ; f<numFramesToWrite ; f++)
    {
      if (frameCounter == numFrames) return f;

      for (int c=0 ; c<numChannels ; c++) writeSample((long) (floatScale * (floatOffset + sampleBuffer[c][offset])));

      offset ++;
      frameCounter ++;
    }

    return numFramesToWrite;
  }


  public void close() throws IOException
  {
    // Close the input stream and set to null
    if (iStream != null)
    {
      iStream.close();
      iStream = null;
    }

    if (oStream != null) 
    {
      // Write out anything still in the local buffer
      if (bufferPointer > 0) oStream.write(buffer, 0, bufferPointer);

      // If an extra byte is required for word alignment, add it to the end
      if (wordAlignAdjust) oStream.write(0);

      // Close the stream and set to null
      oStream.close();
      oStream = null;
    }

    // Flag that the stream is closed
    ioState = IOState.CLOSED;
  }

  public void display()
  {
    display(System.out);
  }

  public void display(PrintStream out)
  {
    out.printf("File: %s\n", file);
    out.printf("Channels: %d, Frames: %d\n", numChannels, numFrames);
    out.printf("IO State: %s\n", ioState);
    out.printf("Sample Rate: %d, Block Align: %d\n", sampleRate, blockAlign);
    out.printf("Valid Bits: %d, Bytes per sample: %d\n", validBits, bytesPerSample);
  }

  public static void main(String[] args)
  {
    if (args.length < 1)
    {
      System.err.println("Must supply filename");
      System.exit(1);
    }

    try
    {
      for (String filename : args)
      {
        GSWavFile readWavFile = openWavFile(new File(filename));
        readWavFile.display();

        long numFrames = readWavFile.getNumFrames();
        int numChannels = readWavFile.getNumChannels();
        int validBits = readWavFile.getValidBits();
        long sampleRate = readWavFile.getSampleRate();

        GSWavFile writeWavFile = newWavFile(new File("out.wav"), numChannels, numFrames, validBits, sampleRate);

        final int BUF_SIZE = 5001;

//        int[] buffer = new int[BUF_SIZE * numChannels];
//        long[] buffer = new long[BUF_SIZE * numChannels];
        double[] buffer = new double[BUF_SIZE * numChannels];

        int framesRead = 0;
        int framesWritten = 0;

        do
        {
          framesRead = readWavFile.readFrames(buffer, BUF_SIZE);
          framesWritten = writeWavFile.writeFrames(buffer, BUF_SIZE);
          System.out.printf("%d %d\n", framesRead, framesWritten);
        }
        while (framesRead != 0);
        
        readWavFile.close();
        writeWavFile.close();
      }

      GSWavFile writeWavFile = newWavFile(new File("out2.wav"), 1, 10, 23, 44100);
      double[] buffer = new double[10];
      writeWavFile.writeFrames(buffer, 10);
      writeWavFile.close();
    }
    catch (Exception e)
    {
      System.err.println(e);
      e.printStackTrace();
    }
  }
}