/// <summary>Opens a device for audio recording.</summary>
/// <param name="deviceName">The device name.</param>
/// <param name="frequency">The frequency that the data should be captured at.</param>
/// <param name="sampleFormat">The requested capture buffer format.</param>
/// <param name="bufferSize">The size of OpenAL's capture internal ring-buffer. This value expects number of samples, not bytes.</param>
public AudioCapture(string deviceName, int frequency, ALFormat sampleFormat, int bufferSize)
{
if (!AudioDeviceEnumerator.IsOpenALSupported)
{
throw new DllNotFoundException("openal32.dll");
}
if (frequency <= 0)
{
throw new ArgumentOutOfRangeException("frequency");
}
if (bufferSize <= 0)
{
throw new ArgumentOutOfRangeException("bufferSize");
}
// Try to open specified device. If it fails, try to open default device.
device_name = deviceName;
Handle = Alc.CaptureOpenDevice(deviceName, frequency, sampleFormat, bufferSize);
if (Handle == IntPtr.Zero)
{
Debug.WriteLine(ErrorMessage(deviceName, frequency, sampleFormat, bufferSize));
device_name = "IntPtr.Zero";
Handle = Alc.CaptureOpenDevice(null, frequency, sampleFormat, bufferSize);
}
if (Handle == IntPtr.Zero)
{
Debug.WriteLine(ErrorMessage("IntPtr.Zero", frequency, sampleFormat, bufferSize));
device_name = AudioDeviceEnumerator.DefaultRecordingDevice;
Handle = Alc.CaptureOpenDevice(AudioDeviceEnumerator.DefaultRecordingDevice, frequency, sampleFormat, bufferSize);
}
if (Handle == IntPtr.Zero)
{
// Everything we tried failed. Capture may not be supported, bail out.
Debug.WriteLine(ErrorMessage(AudioDeviceEnumerator.DefaultRecordingDevice, frequency, sampleFormat, bufferSize));
device_name = "None";
throw new AudioDeviceException("All attempts to open capture devices returned IntPtr.Zero. See debug log for verbose list.");
}
// handle is not null, check for some Alc Error
CheckErrors();
SampleFormat = sampleFormat;
SampleFrequency = frequency;
}
public AudioCapture(string deviceName, int frequency, ALFormat sampleFormat, int bufferSize)
{
if (!AudioDeviceEnumerator.IsOpenALSupported)
{
throw new DllNotFoundException("soft_oal.dll");
}
if (frequency <= 0)
{
throw new ArgumentOutOfRangeException("frequency");
}
if (bufferSize <= 0)
{
throw new ArgumentOutOfRangeException("bufferSize");
}
this.device_name = deviceName;
this.Handle = Alc.CaptureOpenDevice(deviceName, frequency, sampleFormat, bufferSize);
if (this.Handle == IntPtr.Zero)
{
this.device_name = "IntPtr.Zero";
this.Handle = Alc.CaptureOpenDevice((string)null, frequency, sampleFormat, bufferSize);
}
if (this.Handle == IntPtr.Zero)
{
this.device_name = AudioDeviceEnumerator.DefaultRecordingDevice;
this.Handle = Alc.CaptureOpenDevice(AudioDeviceEnumerator.DefaultRecordingDevice, frequency, sampleFormat, bufferSize);
}
if (this.Handle == IntPtr.Zero)
{
this.device_name = "None";
throw new AudioDeviceException("All attempts to open capture devices returned IntPtr.Zero. See debug log for verbose list.");
}
else
{
this.CheckErrors();
this.SampleFormat = sampleFormat;
this.SampleFrequency = frequency;
}
}
