Exemple #1
0
 /**
  * This function goes through all samples of the .WAV song and multiplies the values by the given
  * gainFactor in order to achieve the volume changing
  *
  * @param gainFactor - the value which is multiplied with the sample value to get new sample value
  */
 public void changeVolume(double gainFactor) {
   int sample = 0;
   for (int i = wavTagReader.getFirstSampleIndex(); i < rawData.length - 2; i = i + 2) {
     sample = (short) rawData[i] + (short) ((rawData[i + 1] << 8) & 0xFF00);
     sample *= gainFactor;
     rawData[i] = (byte) (sample & 0xFF);
     rawData[i + 1] = (byte) ((sample >>> 8) & 0xFF);
   }
 }
Exemple #2
0
  /**
   * This function is responsible for muting the fragment of the currently edited .WAV song.
   *
   * @param startSecond - the start time from which the song is cutted
   * @param endSecond - the end time to which the song is cutted
   */
  public void muteSong(int startSecond, int endSecond) {
    int startIndex =
        wavTagReader.getFirstSampleIndex()
            + startSecond
                * wavTagReader.sampleRate
                * wavTagReader.numOfChannels
                * wavTagReader.bitsPerSample
                / 8;
    int endIndex =
        wavTagReader.getFirstSampleIndex()
            + endSecond
                * wavTagReader.sampleRate
                * wavTagReader.numOfChannels
                * wavTagReader.bitsPerSample
                / 8;

    for (int i = startIndex; i < endIndex; i++) rawData[i] = 0;
  }
Exemple #3
0
  /**
   * This function loads the .WAV song which is to be edited into the RAM memory
   *
   * @param fileToOpen - the file to be edited.
   */
  public void loadSong(File fileToOpen) {
    file = fileToOpen;
    int fileLength = (int) file.length();
    rawData = new byte[fileLength];
    try {
      fileInputStream = new FileInputStream(file);
      dataIn = new BufferedInputStream(fileInputStream);
      for (int i = 0; i < fileLength; ++i) rawData[i] = (byte) dataIn.read();
      wavTagReader = new WavTagReader(this.rawData);
      wavTagReader.readHeader();

    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
Exemple #4
0
  /**
   * This function cuts the fragment of song, and puts it in another byte array. It assigns also the
   * header of the edited song to the cut fragment
   *
   * @param startSecond - the start second to cut
   * @param endSecond - the end second to cut
   * @return reference to the array with cut fragment.
   */
  public byte[] cutSong(int startSecond, int endSecond) {
    int startIndex =
        wavTagReader.getFirstSampleIndex()
            + startSecond
                * wavTagReader.sampleRate
                * wavTagReader.numOfChannels
                * wavTagReader.bitsPerSample
                / 8;
    int endIndex =
        wavTagReader.getFirstSampleIndex()
            + endSecond
                * wavTagReader.sampleRate
                * wavTagReader.numOfChannels
                * wavTagReader.bitsPerSample
                / 8;

    byte cutSong[] = new byte[wavTagReader.getFirstSampleIndex() + (endIndex - startIndex)];

    /// Copy the song header except for data field size
    for (int i = 0; i < wavTagReader.getFirstSampleIndex() - 4; i++) {
      cutSong[i] = rawData[i];
    }

    /// Set the new data size
    int samplesSize = endIndex - startIndex;
    int firstSampleIndex = wavTagReader.getFirstSampleIndex();
    for (int i = 0; i < 4; i++) {
      cutSong[firstSampleIndex - 4 + i] = (byte) ((samplesSize >>> (i * 8)) & 0xFF);
    }

    int byteIndex = startIndex;
    /// Copy the data
    for (int i = wavTagReader.getFirstSampleIndex(); i < cutSong.length; i++) {
      cutSong[i] = rawData[byteIndex++];
    }

    return cutSong;
  }