private static MemoryStream Hide(string s, WaveStream sourceStream)
{
int messageLength = s.Length;
byte[] length = BitConverter.GetBytes(messageLength);
byte[] messageByte = Encoding.UTF8.GetBytes(s);
byte[] merge = new byte[length.Length + messageByte.Length];
Buffer.BlockCopy(length, 0, merge, 0, length.Length);
Buffer.BlockCopy(messageByte, 0, merge, length.Length, messageByte.Length);
Stream messageStream = new MemoryStream(merge);
int bytesPerSample = 2;
byte[] waveBuffer = new byte[bytesPerSample];
byte message, bit, waveByte;
int messageBuffer;
while ((messageBuffer = messageStream.ReadByte()) >= 0)
{
message = (byte)messageBuffer;
for (int bitIndex = 0; bitIndex < 8; bitIndex++)
{
sourceStream.Read(waveBuffer, 0, waveBuffer.Length);
waveByte = waveBuffer[bytesPerSample - 1];
bit = (byte)(((message & (byte)(1 << bitIndex)) > 0) ? 1 : 0);
if ((bit == 1) && ((waveByte % 2) == 0))
{
waveByte += 1;
}
else if ((bit == 0) && ((waveByte % 2) == 1))
{
waveByte -= 1;
}
waveBuffer[bytesPerSample - 1] = waveByte;
destinationStream.Write(waveBuffer, 0, bytesPerSample);
}
}
waveBuffer = new byte[sourceStream.Length - sourceStream.Position];
sourceStream.Read(waveBuffer, 0, waveBuffer.Length);
destinationStream.Write(waveBuffer, 0, waveBuffer.Length);
destinationStream = WaveStream.CreateStream(destinationStream, sourceStream.Format);
return(destinationStream);
}
/// <summary>Stop recording, add a header to the sound data</summary>
private void Stop()
{
waveRecorder.Dispose();
recordedStream = WaveStream.CreateStream(recordedData, format);
Close();
}
private void AskForm_FormClosing(object sender, FormClosingEventArgs e)
{
Stop();
if (_isSaving == true)
{
byte[] waveBuffer = new byte[16];
_streamWave = WaveStream.CreateStream(_streamMemory, _waveFormat);
waveBuffer = new byte[_streamWave.Length - _streamWave.Position];
_streamWave.Read(waveBuffer, 0, waveBuffer.Length);
//if ("" != "")
// _streamFile = new FileStream("" + "\\" + _sampleFilename, FileMode.Create);
//else
_streamFile = new FileStream(_sampleFilename, FileMode.Create);
_streamFile.Write(waveBuffer, 0, waveBuffer.Length);
_isSaving = false;
}
if (_streamOut != null)
{
try
{
_streamOut.Close();
}
catch { }
finally
{
_streamOut = null;
}
}
if (_streamWave != null)
{
try
{
_streamWave.Close();
}
catch { }
finally
{
_streamWave = null;
}
}
if (_streamFile != null)
{
try
{
_streamFile.Close();
}
catch { }
finally
{
_streamFile = null;
}
}
if (_streamMemory != null)
{
try
{
_streamMemory.Close();
}
catch { }
finally
{
_streamMemory = null;
}
}
}
private void DataArrived(IntPtr data, int size)
{
if (_isSaving == true)
{
byte[] recBuffer = new byte[size];
System.Runtime.InteropServices.Marshal.Copy(data, recBuffer, 0, size);
_streamMemory.Write(recBuffer, 0, recBuffer.Length);
}
if (_recorderBuffer == null || _recorderBuffer.Length != size)
{
_recorderBuffer = new byte[size];
}
if (_recorderBuffer != null)
{
System.Runtime.InteropServices.Marshal.Copy(data, _recorderBuffer, 0, size);
if (_isPlayer == true)
{
_streamOut.Write(_recorderBuffer, 0, _recorderBuffer.Length);
}
_audioFrame.Process(ref _recorderBuffer);
if (_audioFrame.IsEventActive == true)
{
if (_isSaving == false && false == true)
{
_sampleFilename = DateTime.Now.ToString("yyyyMMddHHmmss") + ".wav";
_timeLastDetection = DateTime.Now;
_isSaving = true;
}
else
{
_timeLastDetection = DateTime.Now;
}
Invoke(new MethodInvoker(AmplitudeEvent));
}
if (_isSaving == true && DateTime.Now.Subtract(_timeLastDetection).Seconds > 3)
{
byte[] waveBuffer = new byte[16];
_streamWave = WaveStream.CreateStream(_streamMemory, _waveFormat);
waveBuffer = new byte[_streamWave.Length - _streamWave.Position];
_streamWave.Read(waveBuffer, 0, waveBuffer.Length);
//if ("" != "")
// _streamFile = new FileStream("" + "\\" + _sampleFilename, FileMode.Create);
//else
_streamFile = new FileStream(_sampleFilename, FileMode.Create);
_streamFile.Write(waveBuffer, 0, waveBuffer.Length);
if (_streamWave != null)
{
_streamWave.Close();
}
if (_streamFile != null)
{
_streamFile.Close();
}
_streamMemory = new MemoryStream();
_isSaving = false;
Invoke(new MethodInvoker(FileSavedEvent));
}
_audioFrame.RenderTimeDomainLeft(ref pictureBoxTimeDomainLeft);
_audioFrame.RenderTimeDomainRight(ref pictureBoxTimeDomainRight);
}
}