private void firstWriteHeaders()
{
// Create data header
header.Header = new char[] { 'd', 'a', 't', 'a' };
header.Length = this.bytes;
byte[] dataHeader = header.GetBytes();
// Create Wave format header
format.FmtHeader = new char[] { 'f', 'm', 't', ' ' };
format.Length = 16;
format.Channels = (short)this.channels;
format.FormatTag = (short)sampleFormat.ToWaveFormat();
format.SamplesPerSecond = sampleRate;
format.BitsPerSample = (short)this.bitsPerSample;
format.BlockAlignment = (short)this.blockAlign;
format.AverageBytesPerSecond = this.averageBitsPerSecond / 8;
waveFormat = format.GetBytes();
// Create RIFF header
riff.RiffHeader = new char[] { 'R', 'I', 'F', 'F' };
riff.WaveHeader = new char[] { 'W', 'A', 'V', 'E' };
riff.Length = this.bytes + dataHeader.Length + waveFormat.Length;
byte[] riffHeader = riff.GetBytes();
// Write headers to allocate space
waveStream.Write(riffHeader, 0, riffHeader.Length);
waveStream.Write(waveFormat, 0, waveFormat.Length);
waveStream.Write(dataHeader, 0, dataHeader.Length);
}
/// <summary>
/// Worker thread.
/// </summary>
///
private void WorkerThread()
{
// Get the selected capture device
DirectSoundCapture captureDevice = new DirectSoundCapture(device);
// Set the capture format
WaveFormat format = new WaveFormat();
format.Channels = 1;
format.SamplesPerSecond = sampleRate;
format.FormatTag = sampleFormat.ToWaveFormat();
format.BitsPerSample = (short)Signal.GetSampleSize(sampleFormat);
format.BlockAlignment = (short)(format.BitsPerSample / 8);
format.AverageBytesPerSecond = format.SamplesPerSecond * format.BlockAlignment;
// Setup the capture buffer
CaptureBufferDescription captureBufferDescription = new CaptureBufferDescription();
captureBufferDescription.Format = format;
captureBufferDescription.BufferBytes = 2 * desiredCaptureSize * format.BlockAlignment;
captureBufferDescription.WaveMapped = true;
captureBufferDescription.ControlEffects = false;
CaptureBuffer captureBuffer = null;
NotificationPosition[] notifications = new NotificationPosition[2];
try
{
captureBuffer = new CaptureBuffer(captureDevice, captureBufferDescription);
// Setup the notification positions
int bufferPortionSize = captureBuffer.SizeInBytes / 2;
notifications[0] = new NotificationPosition();
notifications[0].Offset = bufferPortionSize - 1;
notifications[0].Event = new AutoResetEvent(false);
notifications[1] = new NotificationPosition();
notifications[1].Offset = bufferPortionSize - 1 + bufferPortionSize;
notifications[1].Event = new AutoResetEvent(false);
captureBuffer.SetNotificationPositions(notifications);
// Make a copy of the wait handles
WaitHandle[] waitHandles = new WaitHandle[notifications.Length];
for (int i = 0; i < notifications.Length; i++)
{
waitHandles[i] = notifications[i].Event;
}
// Start capturing
captureBuffer.Start(true);
if (sampleFormat == SampleFormat.Format32BitIeeeFloat)
{
float[] currentSample = new float[desiredCaptureSize];
while (!stopEvent.WaitOne(0, true))
{
int bufferPortionIndex = WaitHandle.WaitAny(waitHandles);
captureBuffer.Read(currentSample, 0, currentSample.Length, bufferPortionSize * bufferPortionIndex);
OnNewFrame(currentSample);
}
}
else if (sampleFormat == SampleFormat.Format16Bit)
{
short[] currentSample = new short[desiredCaptureSize];
while (!stopEvent.WaitOne(0, true))
{
int bufferPortionIndex = WaitHandle.WaitAny(waitHandles);
captureBuffer.Read(currentSample, 0, currentSample.Length, bufferPortionSize * bufferPortionIndex);
OnNewFrame(currentSample);
}
}
}
catch (Exception ex)
{
if (AudioSourceError != null)
{
AudioSourceError(this, new AudioSourceErrorEventArgs(ex.Message));
}
else
{
throw;
}
}
finally
{
if (captureBuffer != null)
{
captureBuffer.Stop();
captureBuffer.Dispose();
}
if (captureDevice != null)
{
captureDevice.Dispose();
}
for (int i = 0; i < notifications.Length; i++)
{
if (notifications[i].Event != null)
{
notifications[i].Event.Close();
}
}
}
}
/// <summary>
/// Worker thread.
/// </summary>
///
private void WorkerThread()
{
needToStop = false;
// Get the selected capture device
DirectSoundCapture captureDevice = new DirectSoundCapture(device);
// Set the capture format
var bitsPerSample = Signal.GetSampleSize(sampleFormat);
WaveFormat format = WaveFormat.CreateCustomFormat(sampleFormat.ToWaveFormat(), sampleRate, 1,
sampleRate * bitsPerSample / 8, bitsPerSample / 8, bitsPerSample);
// Setup the capture buffer
CaptureBufferDescription captureBufferDescription = new CaptureBufferDescription();
captureBufferDescription.Format = format;
captureBufferDescription.BufferBytes = 2 * desiredCaptureSize * format.BlockAlign;
captureBufferDescription.Flags |= CaptureBufferCapabilitiesFlags.WaveMapped;
captureBufferDescription.Flags &= ~CaptureBufferCapabilitiesFlags.ControlEffects;
CaptureBuffer captureBuffer = null;
NotificationPosition[] notifications = new NotificationPosition[2];
try
{
captureBuffer = new CaptureBuffer(captureDevice, captureBufferDescription);
// Setup the notification positions
int bufferPortionSize = captureBuffer.Capabilities.BufferBytes / 2;
notifications[0] = new NotificationPosition();
notifications[0].Offset = bufferPortionSize - 1;
notifications[0].WaitHandle = new AutoResetEvent(false);
notifications[1] = new NotificationPosition();
notifications[1].Offset = bufferPortionSize - 1 + bufferPortionSize;
notifications[1].WaitHandle = new AutoResetEvent(false);
captureBuffer.SetNotificationPositions(notifications);
// Make a copy of the wait handles
WaitHandle[] waitHandles = new WaitHandle[notifications.Length];
for (int i = 0; i < notifications.Length; i++)
{
waitHandles[i] = notifications[i].WaitHandle;
}
// Start capturing
captureBuffer.Start(true);
if (sampleFormat == SampleFormat.Format32BitIeeeFloat)
{
float[] currentSample = new float[desiredCaptureSize];
Signal signal = Signal.FromArray(currentSample, sampleRate, sampleFormat);
while (!needToStop)
{
int bufferPortionIndex = WaitHandle.WaitAny(waitHandles);
captureBuffer.Read(currentSample, 0, currentSample.Length, bufferPortionSize * bufferPortionIndex, LockFlags.None);
OnNewFrame(signal);
}
}
else if (sampleFormat == SampleFormat.Format16Bit)
{
short[] currentSample = new short[desiredCaptureSize];
Signal signal = Signal.FromArray(currentSample, sampleRate, sampleFormat);
while (!needToStop)
{
int bufferPortionIndex = WaitHandle.WaitAny(waitHandles);
captureBuffer.Read(currentSample, 0, currentSample.Length, bufferPortionSize * bufferPortionIndex, LockFlags.None);
OnNewFrame(signal);
}
}
}
catch (Exception ex)
{
if (AudioSourceError == null)
{
throw;
}
AudioSourceError(this, new AudioSourceErrorEventArgs(ex));
}
finally
{
if (captureBuffer != null)
{
captureBuffer.Stop();
captureBuffer.Dispose();
}
if (captureDevice != null)
{
captureDevice.Dispose();
}
#if !NETSTANDARD1_4
for (int i = 0; i < notifications.Length; i++)
{
if (notifications[i].WaitHandle != null)
{
notifications[i].WaitHandle.Close();
}
}
#endif
}
}
