/// <summary>
/// Copies header to a stream.
/// </summary>
/// <param name="waveData">Wav data stream.</param>
/// <param name="format">WAVEFORMATEX wav format.</param>
/// <returns>Stream.</returns>
private static Stream _CreateStream(Stream waveData, WaveFormatEx format)
{
MemoryStream stream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(System.Text.Encoding.ASCII.GetBytes("RIFF".ToCharArray()));
writer.Write((Int32)(waveData.Length + 36)); //File length minus first 8 bytes of RIFF description
writer.Write(System.Text.Encoding.ASCII.GetBytes("WAVEfmt ".ToCharArray()));
writer.Write((Int32)16); //length of following chunk: 16
writer.Write((Int16)format.wFormatTag);
writer.Write((Int16)format.nChannels);
writer.Write((Int32)format.nSamplesPerSec);
writer.Write((Int32)format.nAvgBytesPerSec);
writer.Write((Int16)format.nBlockAlign);
writer.Write((Int16)format.wBitsPerSample);
writer.Write(System.Text.Encoding.ASCII.GetBytes("data".ToCharArray()));
writer.Write((Int32)waveData.Length);
waveData.Seek(0, SeekOrigin.Begin);
byte[] b = new byte[waveData.Length];
waveData.Read(b, 0, (int)waveData.Length);
writer.Write(b);
writer.Seek(0, SeekOrigin.Begin);
return(stream);
}
/// <summary>
/// Creates a WAVEFORMATEX structure.
/// </summary>
/// <param name="rate">Bit rate.</param>
/// <param name="isEightBits">Is 8bits per sample, or 16th.</param>
/// <param name="channels">Number of channels.</param>
/// <returns>Created wave format object.</returns>
private WaveFormatEx _CreateWaveFormat(uint rate, bool isEightBits, ushort channels)
{
WaveFormatEx wfx = new WaveFormatEx();
wfx.wFormatTag = WAVE_FORMAT_PCM;
wfx.nChannels = channels;
wfx.nSamplesPerSec = rate;
ushort bits = isEightBits ? (ushort)8 : (ushort)16;
wfx.wBitsPerSample = bits;
wfx.nBlockAlign = (ushort)(channels * (bits / 8));
wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;
wfx.cbSize = 0;
return(wfx);
}
private static extern MMSYSERR waveInOpen(out IntPtr phwi, int uDeviceID, ref WaveFormatEx lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
/// <summary>Initialze class and set defaults.</summary>
/// <param name="device">Current device id.</param>
/// <param name="doneProc">data callback</param>
/// <param name="format">WAVEFORMATEX format description</param>
public WaveInRecorder(int device, BufferDoneEventHandler doneProc, WaveFormatEx format)
{
_device = device;
_eDoneProc = doneProc;
_waveFormat = format;
}
/// <summary>
/// Loads recorder.
/// </summary>
/// <param name="settings">Audio settings.</param>
/// <param name="equalizer">Equalizer.</param>
private void _RecorderLoad(AudioSettings settings)
{
try
{
if (_isRecorderLoaded)
_RecorderUnLoad();
// Prepare destination stream.
if (_streamMemory != null)
_streamMemory.Dispose();
_streamMemory = new MemoryStream();
// Create wave format and load recorder.
_waveFormat = _CreateWaveFormat((uint)settings.SamplesPerSecond, settings.isEightBitSample, settings.Channels);
_recorder = new WaveInRecorder(settings.AudioInputDevice, new BufferDoneEventHandler(_RecordData), _waveFormat);
_isRecorderLoaded = true;
}
catch (Exception)
{
throw new Exception(Properties.Resources.DeviceNotFoundError);
}
}
/// <summary>
/// Creates a WAVEFORMATEX structure.
/// </summary>
/// <param name="rate">Bit rate.</param>
/// <param name="isEightBits">Is 8bits per sample, or 16th.</param>
/// <param name="channels">Number of channels.</param>
/// <returns>Created wave format object.</returns>
private WaveFormatEx _CreateWaveFormat(uint rate, bool isEightBits, ushort channels)
{
WaveFormatEx wfx = new WaveFormatEx();
wfx.wFormatTag = WAVE_FORMAT_PCM;
wfx.nChannels = channels;
wfx.nSamplesPerSec = rate;
ushort bits = isEightBits ? (ushort)8 : (ushort)16;
wfx.wBitsPerSample = bits;
wfx.nBlockAlign = (ushort)(channels * (bits / 8));
wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;
wfx.cbSize = 0;
return wfx;
}
/// <summary>
/// Copies header to a stream.
/// </summary>
/// <param name="waveData">Wav data stream.</param>
/// <param name="format">WAVEFORMATEX wav format.</param>
/// <returns>Stream.</returns>
private static Stream _CreateStream(Stream waveData, WaveFormatEx format)
{
MemoryStream stream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(stream);
writer.Write(System.Text.Encoding.ASCII.GetBytes("RIFF".ToCharArray()));
writer.Write((Int32)(waveData.Length + 36)); //File length minus first 8 bytes of RIFF description
writer.Write(System.Text.Encoding.ASCII.GetBytes("WAVEfmt ".ToCharArray()));
writer.Write((Int32)16); //length of following chunk: 16
writer.Write((Int16)format.wFormatTag);
writer.Write((Int16)format.nChannels);
writer.Write((Int32)format.nSamplesPerSec);
writer.Write((Int32)format.nAvgBytesPerSec);
writer.Write((Int16)format.nBlockAlign);
writer.Write((Int16)format.wBitsPerSample);
writer.Write(System.Text.Encoding.ASCII.GetBytes("data".ToCharArray()));
writer.Write((Int32)waveData.Length);
waveData.Seek(0, SeekOrigin.Begin);
byte[] b = new byte[waveData.Length];
waveData.Read(b, 0, (int)waveData.Length);
writer.Write(b);
writer.Seek(0, SeekOrigin.Begin);
return stream;
}
private static extern MMSYSERR waveInOpen(out IntPtr phwi, int uDeviceID, ref WaveFormatEx lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
/// <summary>Initialze class and set defaults.</summary>
/// <param name="device">Current device id.</param>
/// <param name="doneProc">data callback</param>
/// <param name="format">WAVEFORMATEX format description</param>
public WaveInRecorder(int device, BufferDoneEventHandler doneProc, WaveFormatEx format)
{
_device = device;
_eDoneProc = doneProc;
_waveFormat = format;
}
