public NLSBSteganographerDecoder(FileInDecodingStream audioFileStream, Stream dataFileStreamOut, byte[] key)
{
AudioFileStream = audioFileStream;
DataFileStreamOut = dataFileStreamOut;
Rng = new KeyedRng(key);
AudioFileStream.MetadataCallback = MetadataCallback;
}
private void CleanupDecoder()
{
dataFileStream.Close();
AudioFileInStream.Close();
AudioFileInStream = null;
dataFileStream = null;
AudioFileName = null;
DataFileName = null;
DisplayAudioFileBox.Invoke((Action <object>)(unused => DisplayAudioFileBox.Text = ""), 0);
DisplayDataFileBox.Invoke((Action <object>)(unused => DisplayDataFileBox.Text = ""), 0);
Decoder = null;
}
private void SetupAudioStreams(int dataFileSize)
{
AudioFileInStream = new FileInDecodingStream();
//AudioFileInStream.InfoOutFile = InfoFileWriter;
AudioFileInStream.Initialize(AudioFileName);
AudioFileInStream.ProcessSingle();
AudioFileInStream.ClearReadData();
SetupOutputStream(dataFileSize);
AudioFileInStream.Reset();
AudioFileInStream.MetadataCallback = NLSBSteganographerEncoder.MetadataCallback;
AudioFileInStream.Initialize(AudioFileName);
AudioFileInStream.ProgressCallback = ProgressCallback;
MainWorkerThread = new Thread(new ParameterizedThreadStart(x => { Encoder.ProcessFile(WriteCallback); CleanupEncoder(); }));
}
/**
* <summary>audioFileStream must be initialized prior to passing
* dataFileStream must be open prior to passing</summary>
*/
public NLSBSteganographerEncoder(FileInDecodingStream audioFileStream, Stream dataFileStream, byte[] key, int dataFileSize)
{
if ((audioFileStream.GetTotalSamples() * audioFileStream.GetChannels()) < ((uint)dataFileSize * 8))
{
throw new InsufficientAudioException();
}
AudioFileStream = audioFileStream;
AudioFileStream.MetadataCallback = MetadataCallback;
DataFileStream = dataFileStream;
for (int i = 0; i < dataFileSize * 8; i++)
{
BitPermutationIndices.Add(i);
}
Rng = new KeyedRng(key);
}
private void SetupDecoder(out Stream dataFileStream)
{
AudioFileInStream = new FileInDecodingStream();
AudioFileInStream.InfoOutFile = InfoFileWriter;
AudioFileInStream.SetMetadataRespond(MetadataType.VorbisComment);
SaveFileDialog dlg = new SaveFileDialog();
dlg.Filter = "All Files (*.*)|*.*";
dlg.ShowDialog();
if (dlg.FileName == "")
{
dataFileStream = null;
return;
}
dataFileStream = new StreamWriter(dlg.FileName).BaseStream;
Decoder = new NLSBSteganographerDecoder(
AudioFileInStream,
dataFileStream,
KeyHelper.GenerateKeyFromUserInput()
);
AudioFileInStream.Initialize(AudioFileName);
AudioFileInStream.ProgressCallback = ProgressCallback;
MainWorkerThread = new Thread(new ParameterizedThreadStart(x => { Decoder.ProcessFile(); CleanupDecoder(); }));
}
