public virtual void StopCapture()
{
Log.AssertAndThrowPossibleBug(_clip != null, "CDDAE69D-44DC-487F-9B69-4703B779400E", "Attempted to stop microphone capture, but it is already stopped");
//Stop diagnostic output
if (_microphoneDiagnosticOutput != null)
{
_microphoneDiagnosticOutput.Dispose();
_microphoneDiagnosticOutput = null;
}
//Stop capture
Microphone.End(_micName);
_format = null;
_clip = null;
_readHead = 0;
_started = false;
_micName = null;
//Clean the buffers
_rawMicSamples.Reset();
_rawMicFrames.Reset();
//Stop watching for device changes
AudioSettings.OnAudioConfigurationChanged -= OnAudioDeviceChanged;
_audioDeviceChanged = false;
}
public void Handle(ArraySegment <float> inputSamples, WaveFormat format)
{
if (_resetRequired)
{
Log.Trace("Resetting encoder pipeline");
_resampler.Reset();
_input.Reset();
_output.Reset();
_resetRequired = false;
}
if (!format.Equals(_inputFormat))
{
throw new ArgumentException(string.Format("Samples expected in format {0}, but supplied with format {1}", _inputFormat, format), "format");
}
if (_microphoneDiagnosticOutput != null)
{
_microphoneDiagnosticOutput.WriteSamples(inputSamples);
}
//Write samples to the pipeline (keep a running total of how many we have sent)
//Keep sending until we've sent all of these samples
var offset = 0;
while (offset != inputSamples.Count)
{
offset += _input.Write(inputSamples.Array, offset + inputSamples.Offset, inputSamples.Count - offset);
//Drain some of those samples just written, encode them and send them off
EncodeFrames();
}
}
//These methods run on the main thread, they drain audio from the mic and send it across to the other thread for proper processing
//
// Update - Either discard mic samples (if no one is subscribed to mic data) or call DrainMicSamples
// DrainMicSamples - Read as many samples as possible from the mic (using a set of pow2 sized buffers to get as
// much as possible), passes samples to ConsumeMicSamples
// ConsumeMicSamples - Take some number of samples from produced by DrainMicSamples and buffer them up, call SendFrame
// every time some samples are added to the buffer
// SendFrame - Read as many frames as possible from the buffer and send them to the other thread. Also poke the other thread
// to tell it that it has work to do
public void Update()
{
if (!_started)
{
_readHead = Microphone.GetPosition(_micName);
_started = _readHead > 0;
if (!_started)
{
return;
}
}
if (_preprocessing.RequiresInput)
{
//Read samples from clip into mic sample buffer
DrainMicSamples();
}
else
{
//We're not interested in the audio from the mic, so skip the read head to the current mic position and drop all the audio
_readHead = Microphone.GetPosition(_micName);
_rawMicSamples.Reset();
_rawMicFrames.Reset();
_preprocessing.Reset();
if (_microphoneDiagnosticOutput != null)
{
_microphoneDiagnosticOutput.Dispose();
_microphoneDiagnosticOutput = null;
}
}
}
public void Reset()
{
if (_disposed)
{
return;
}
using (_encoder.Lock())
{
Log.Debug("Applying encoder reset");
_resampler.Reset();
_input.Reset();
_output.Reset();
_stopping = false;
_stopped = false;
}
}
public void ReceiveMicrophoneData(ArraySegment <float> inputSamples, [NotNull] WaveFormat format)
{
if (format == null)
{
throw new ArgumentNullException("format");
}
if (!format.Equals(_inputFormat))
{
throw new ArgumentException(string.Format("Samples expected in format {0}, but supplied with format {1}", _inputFormat, format), "format");
}
using (var encoderLock = _encoder.Lock())
{
var encoder = encoderLock.Value;
//Early exit if we have been disposed on the main thread
if (_disposed)
{
return;
}
//Apply a reset if one is pending
if (_resetRequired)
{
Log.Trace("Resetting encoder pipeline");
_resampler.Reset();
_input.Reset();
_output.Reset();
_resetRequired = false;
Stopping = false;
Stopped = false;
}
//Early exit if we've sent the last frame of this stream
if (Stopped)
{
return;
}
//Propogate the loss value on to the encoder
encoder.PacketLoss = TransmissionPacketLoss;
//Write samples to the pipeline (keep a running total of how many we have sent)
//Keep sending until we've sent all of these samples
var offset = 0;
var stopping = Stopping;
while (offset != inputSamples.Count)
{
// ReSharper disable once AssignNullToNotNullAttribute (Justification: Array segment cannot be null)
offset += _input.Write(new ArraySegment <float>(inputSamples.Array, inputSamples.Offset + offset, inputSamples.Count - offset));
//Drain some of those samples just written, encode them and send them off
//If we're shutting down send a maximum of 1 packet
var encodedFrames = EncodeFrames(encoder, stopping ? 1 : int.MaxValue);
//Don't encode any more frames if we've sent the one final frame
if (encodedFrames > 0 && stopping)
{
Stopped = true;
break;
}
}
}
}
