Class WAVWriter

CodenameOne/src/com/codename1/media/WAVWriter.java:15–153

/// @author shannah
///
public class WAVWriter implements AutoCloseable {
    private final File outputFile;
    private final int samplingRate;
    private final int channels;
    private final int numBits;
    private OutputStream out;
    private long dataLength;

    /// Creates a new writer for writing a WAV file.
    ///
    /// #### Parameters
    ///
    /// - `outputFile`: The output file.
    ///
    /// - `samplingRate`: The sampling rate.  E.g. 44100
    ///
    /// - `channels`: The number of channels.  E.g. 1 or 2
    ///
    /// - `numBits`: 8 or 16
    ///
    /// #### Throws
    ///
    /// - `IOException`
    public WAVWriter(final File outputFile, final int samplingRate, final int channels, final int numBits) throws IOException {
        this.outputFile = outputFile;
        this.out = FileSystemStorage.getInstance().openOutputStream(outputFile.getAbsolutePath());
        this.samplingRate = samplingRate;
        this.channels = channels;
        this.numBits = numBits;
    }

    private void writeHeader() throws IOException {
        final byte[] header = new byte[44];
        long totalDataLen = dataLength + 36;
        final long bitrate = (long) this.samplingRate * this.channels * this.numBits;
        header[0] = 82;
        header[1] = 73;
        header[3] = (header[2] = 70);
        header[4] = (byte) (totalDataLen & 0xFFL);
        header[5] = (byte) (totalDataLen >> 8 & 0xFFL);
        header[6] = (byte) (totalDataLen >> 16 & 0xFFL);
        header[7] = (byte) (totalDataLen >> 24 & 0xFFL);
        header[8] = 87;
        header[9] = 65;
        header[10] = 86;
        header[11] = 69;
        header[12] = 102;
        header[13] = 109;
        header[14] = 116;
        header[15] = 32;
        header[16] = (byte) this.numBits;
        header[17] = 0;
        header[19] = (header[18] = 0);
        header[20] = 1;
        header[21] = 0;
        header[22] = (byte) this.channels;
        header[23] = 0;
        header[24] = (byte) (this.samplingRate & 0xFF);