public static RiffStream OpenWrite(Stream underlyingStream, WaveFormat2 fmt)
{
RiffStream stm = new RiffStream();
stm._accessMode = FileAccess.Write;
stm._baseStream = underlyingStream;
stm.InitializeForWriting(underlyingStream, fmt, fmt, false);
stm.WriteHeader();
return(stm);
}
public static RiffStream Append(Stream underlyingStream)
{
RiffStream stm = new RiffStream();
stm._accessMode = FileAccess.Write;
stm._baseStream = underlyingStream;
stm._baseStream.Position = 0;
WaveFormat2 fmtOut = WaveFormat2.FromStream(underlyingStream);
stm._baseStream.Position = stm._baseStream.Length;
stm.InitializeForWriting(underlyingStream, fmtOut, fmtOut, true);
stm.WriteHeader();
return(stm);
}
public static RiffStream OpenRead(Stream underlyingStream)
{
RiffStream stm = new RiffStream();
stm._accessMode = FileAccess.Read;
stm._baseStream = underlyingStream;
stm.LoadHeader();
if (stm.Format.FormatTag != FormatTag.PCM) // need conversion
{
stm.Detach();
underlyingStream.Seek(0, SeekOrigin.Begin);
stm = ACMStream.OpenRead(underlyingStream);
}
return(stm);
}
/// <summary>
/// Record sound data for specified number of seconds using given wave format
/// The stream will be a properly formatted RIFF file
/// </summary>
/// <param name="st">Stream into which recorded samples are written</param>
/// <param name="Seconds">Seconds of data to record</param>
/// <param name="format">Sound format to record in.</param>
public RiffStream RecordFor(Stream st, short Seconds, WaveFormat2 format)
{
// only allow 1 recording session at a time
if (recording)
{
throw new InvalidOperationException("Already recording");
}
m_hWaveIn = IntPtr.Zero;
// set our global flag
recording = true;
if (m_qBuffers == null)
{
m_qBuffers = new Queue <WaveHeader>(MaxBuffers);
}
if (m_HandleMap == null)
{
m_HandleMap = new System.Collections.Hashtable(MaxBuffers);
}
m_recformat = new WaveFormat2();
#if !NDOC
// create the callback message window
m_recmw = new SoundMessageWindow();
m_recmw.WaveDoneMessage += new WaveDoneHandler(m_recmw_WaveDoneMessage);
m_recmw.WaveCloseMessage += new WaveCloseHandler(mw_WaveCloseMessage);
m_recmw.WaveOpenMessage += new WaveOpenHandler(mw_WaveOpenMessage);
#endif
bool append = st.Length >= 42;
if (format.FormatTag == FormatTag.PCM)
{
m_recformat = format;
if (append)
{
m_streamRecord = RiffStream.Append(st);
}
else
{
m_streamRecord = RiffStream.OpenWrite(st, m_recformat);
}
}
else
{
m_recformat = WaveFormat2.GetPCMWaveFormat(SoundFormats.Mono8bit11kHz);
if (append)
{
m_streamRecord = ACMStream.Append(st, m_recformat);
}
else
{
m_streamRecord = ACMStream.OpenWrite(st, m_recformat, format);
}
}
#if !NDOC
// check for support of selected format
CheckWaveError(NativeMethods.waveInOpen(out m_hWaveIn, WAVE_MAPPER, m_recformat.GetBytes(), IntPtr.Zero, 0, WAVE_FORMAT_QUERY));
// open wave device
CheckWaveError(NativeMethods.waveInOpen(out m_hWaveIn, (uint)m_deviceID, m_recformat.GetBytes(), m_recmw.Hwnd, 0, CALLBACK_WINDOW));
m_recBufferSize = (int)(Math.Min((int)Seconds, BufferLen) * m_recformat.AvgBytesPerSec);
for (int i = 0; i < 2; i++)
{
WaveHeader hdr = GetNewRecordBuffer(m_recBufferSize);
// send the buffer to the device
CheckWaveError(NativeMethods.waveInAddBuffer(m_hWaveIn, hdr.Pointer, hdr.HeaderLength));
}
// begin recording
CheckWaveError(NativeMethods.waveInStart(m_hWaveIn));
recordingFinished = false;
m_recTimer = new Timer(new TimerCallback(RecTimerCallback), this, Seconds * 1000, Timeout.Infinite);
#endif
return(m_streamRecord);
}
