/// <summary>
/// Creates a new basic RTP session that captures and renders audio to/from the default system devices.
/// </summary>
/// <param name="audioEncoder">A 3rd party audio encoder that can be used to encode and decode
/// specific audio codecs.</param>
/// <param name="externalSource">Optional. An external source to use in combination with the source
/// provided by this end point. The application will need to signal which source is active.</param>
/// <param name="disableSource">Set to true to disable the use of the audio source functionality, i.e.
/// don't capture input from the microphone.</param>
/// <param name="disableSink">Set to true to disable the use of the audio sink functionality, i.e.
/// don't playback audio to the speaker.</param>
public WindowsAudioEndPoint(IAudioEncoder audioEncoder,
int audioOutDeviceIndex = AUDIO_OUTPUTDEVICE_INDEX,
int audioInDeviceIndex = AUDIO_INPUTDEVICE_INDEX,
bool disableSource = false,
bool disableSink = false)
{
logger = SIPSorcery.LogFactory.CreateLogger <WindowsAudioEndPoint>();
_audioEncoder = audioEncoder;
_disableSource = disableSource;
_disableSink = disableSink;
if (!_disableSink)
{
try
{
// Playback device.
_waveOutEvent = new WaveOutEvent();
_waveOutEvent.DeviceNumber = audioOutDeviceIndex;
_waveProvider = new BufferedWaveProvider(_waveFormat);
_waveProvider.DiscardOnBufferOverflow = true;
_waveOutEvent.Init(_waveProvider);
}
catch (Exception excp)
{
logger.LogWarning(0, excp, "WindowsAudioEndPoint failed to initialise playback device.");
OnAudioSinkError?.Invoke($"WindowsAudioEndPoint failed to initialise playback device. {excp.Message}");
}
}
if (!_disableSource)
{
if (WaveInEvent.DeviceCount > 0)
{
if (WaveInEvent.DeviceCount > audioInDeviceIndex)
{
_waveInEvent = new WaveInEvent();
_waveInEvent.BufferMilliseconds = AUDIO_SAMPLE_PERIOD_MILLISECONDS;
_waveInEvent.NumberOfBuffers = INPUT_BUFFERS;
_waveInEvent.DeviceNumber = audioInDeviceIndex;
_waveInEvent.WaveFormat = _waveFormat;
_waveInEvent.DataAvailable += LocalAudioSampleAvailable;
}
else
{
OnAudioSourceError?.Invoke($"The requested audio input device index {audioInDeviceIndex} exceeds the maximum index of {WaveInEvent.DeviceCount - 1}.");
}
}
else
{
OnAudioSourceError?.Invoke("No audio capture devices are available.");
}
}
}
private void InitPlaybackDevice(int audioOutDeviceIndex, int audioSinkSampleRate)
{
try
{
_waveOutEvent?.Stop();
_waveSinkFormat = new WaveFormat(
audioSinkSampleRate,
DEVICE_BITS_PER_SAMPLE,
DEVICE_CHANNELS);
// Playback device.
_waveOutEvent = new WaveOutEvent();
_waveOutEvent.DeviceNumber = audioOutDeviceIndex;
_waveProvider = new BufferedWaveProvider(_waveSinkFormat);
_waveProvider.DiscardOnBufferOverflow = true;
_waveOutEvent.Init(_waveProvider);
}
catch (Exception excp)
{
logger.LogWarning(0, excp, "WindowsAudioEndPoint failed to initialise playback device.");
OnAudioSinkError?.Invoke($"WindowsAudioEndPoint failed to initialise playback device. {excp.Message}");
}
}
