void Awake()
{
microphoneUI = transform.GetComponent <MicrophoneUI>();
if (microphoneUI != null)
{
prewarned = !microphoneUI.AskPermission();
}
else
{
LogMT.Log("No UI detected, defulting to skip permission step");
prewarned = true;
}
/*if (FindObjectOfType<AudioListener>() == null)
* {
* LogMT.LogWarning("MicrophoneController: No AudioListener found, creating one");
* GameObject audioListener = new GameObject();
* audioListener.name = "AudioListener";
* audioListener.AddComponent<AudioListener>();
* }
*
* AudioMixer audioMixer = Resources.Load("MicrophoneToolsMixer") as AudioMixer;
* if (audioMixer == null)
* LogMT.LogError("MicrophoneController: Could not find Audio Mixer");*/
}
/// <summary>
/// Track where we should consider the current position in the AudioClip for accessing samples.
/// </summary>
private void BufferTrackingUpdate()
{
deltaDSPTime = (AudioSettings.dspTime - previousDSPTime);
if (waitingForAudio)
{
float[] newData = new float[audioClip.samples];
audioClip.GetData(newData, 0);
for (int i = newData.Length - 1; i >= 0; i--) // going backwards find end
//for (int i=0;i<buffer.Length;i++) // going forwards, find beginning
{
if (newData[i] != 0)
{
bufferPos = 0;
waitingForAudio = false;
gameObject.SendMessage("OnSoundEvent", SoundEvent.BufferReady, SendMessageOptions.DontRequireReceiver);
break;
}
}
}
else
{
int samplesPassed = (int)Math.Ceiling(deltaDSPTime * audioClip.frequency);
bufferPos = (bufferPos + samplesPassed) % audioClip.samples;
if (logAudioData)
{
float[] newData = new float[samplesPassed];
audioClip.GetData(newData, bufferPos);
LogMT.SendByteDataBase64("MTaudio", EncodeFloatBlockTo16BitPCM(newData));
}
}
}
void Update()
{
if (microphoneDeviceSet)
{
if (microphoneActive)
{
MicrophoneUpdate();
}
else if (listening) // If we're listening, but the microphone shouldn't be active
{
StopListening();
}
}
else if (microphoneActive) // If the microphone should be active, but it is not configured
{
LogMT.LogWarning("MicrophoneController: Microphone active yet no microphone device set!");
//microphoneActive = false;
}
if (listening)
{
BufferTrackingUpdate();
}
else
{
MicrophoneConfigurationUpdate();
}
previousDSPTime = AudioSettings.dspTime;
}
void OnSoundEvent(SoundEvent soundEvent)
{
LogMT.Log(soundEvent.ToString());
switch (soundEvent)
{
case SoundEvent.PermissionGranted:
prewarned = true;
break;
}
}
/// <summary>
/// Watch for changes in microphone configuration status, possibly due to user interaction, and
/// configure appropriately
/// </summary>
private void MicrophoneConfigurationUpdate()
{
if (microphoneAvailable)
{
if (!microphoneChoiceSent)
{
if (!prewarned)
{
if (!prewarningSent)
{
gameObject.SendMessage("OnSoundEvent", SoundEvent.PermissionRequired, SendMessageOptions.DontRequireReceiver);
prewarningSent = true;
}
}
else if (Application.HasUserAuthorization(UserAuthorization.Microphone))
{
if (Microphone.devices.Length > 0)
{
if (microphoneUI != null)
{
if (microphoneUI.UseDefaultMic())
{
UseDefaultDevice();
}
else
{
microphoneUI.ChooseDevice(Microphone.devices);
}
}
else
{
UseDefaultDevice();
}
microphoneChoiceSent = true;
}
else
{
if (microphoneUI != null)
{
microphoneUI.NoMicrophonesFound();
}
LogMT.LogWarning("MicrophoneController: No microphones found");
microphoneAvailable = false;
}
}
else if (!authorizationRequestSent)
{
Application.RequestUserAuthorization(UserAuthorization.Microphone);
LogMT.Log("MicrophoneController: User authorization requested for microphone");
authorizationRequestSent = true;
}
}
}
}
public void OnSoundEvent(SoundEvent e)
{
switch (e)
{
case SoundEvent.BufferReady:
yin = new Yin(microphoneController.SampleRate, SyllableDetectionAlgorithm.windowSize);
LogMT.Log("Window Size for Algorithm: " + SyllableDetectionAlgorithm.windowSize);
syllableDetectionAlgorithm = new SyllableDetectionAlgorithm(microphoneController.SampleRate);
break;
}
}
public bool Run(float[] data, float deltaTime)
{
syllableDetected = false;
float sumIntensity = 0;
if (!SinglePolaity(data)) // Here to easily take out artifacts found on my poor desktop mic
{
sumIntensity = SumAbsIntensity(data);
level = sumIntensity / data.Length;
float mean = SumIntensity(data) / data.Length;
int sampleOffsetHigh;
int sampleOffsetLow;
FrequencyBandToSampleOffsets(data.Length, sampleRate, 80, 300, out sampleOffsetHigh, out sampleOffsetLow); // was 80,900
float newNPA = DoNormalisedPeakAutocorrelation(data, mean, sampleOffsetHigh, sampleOffsetLow);
normalisedPeakAutocorrelation += (newNPA - normalisedPeakAutocorrelation) * deltaTime * 10;
DipTracking();
// If we're using the periodicity, check that the normalised value is high before
// considering it
if (normalisedPeakAutocorrelation > npaThreshold)
{
peak = Math.Max(peak, level);
PeakPicking();
}
}
else
{
level = 0;
}
if (syllableDetected)
{
totalSyllables++;
}
LogMT.SendStreamValue("MTdt", deltaTime);
LogMT.SendStreamValue("MTnpa", normalisedPeakAutocorrelation);
LogMT.SendStreamValue("MTlvl", level);
LogMT.SendStreamValue("MTpek", peak);
LogMT.SendStreamValue("MTdip", dip);
LogMT.SendStreamValue("MTdpd", Convert.ToInt32(dipped));
LogMT.SendStreamValue("MTsbs", totalSyllables);
return(syllableDetected);
}
/// <summary>
/// Will set the sampling rate to the default, or the highest available from the microphone if
/// this is lower than the default
/// </summary>
private void SetSamplingRate()
{
int min, max;
Microphone.GetDeviceCaps(microphoneDeviceName, out min, out max);
if (max == 0)
{
sampleRate = defaultSampleRate;
}
else if (defaultSampleRate > max)
{
sampleRate = max;
}
LogMT.Log("MicrophoneController: Sampling rate: " + sampleRate);
}
/// <summary>
/// Calculates the peak of the normalised autocorrelation of a window of samples,
/// with an offset within a given band.
/// </summary>
private static float DoNormalisedPeakAutocorrelation(float[] window,
float mean,
int sampleOffsetHigh,
int sampleOffsetLow)
{
float highest = 0;
float[] gammaA = new float[sampleOffsetHigh - sampleOffsetLow + 1];
float sumZero = 0;
for (int t = 0; t < window.Length - 0; t++)
{
sumZero += window[t + 0] * window[t];
}
float gammaZero = sumZero / window.Length;
for (int h = sampleOffsetHigh; h >= sampleOffsetLow; h--)
{
float sum = 0;
for (int t = 0; t < window.Length - h; t++)
{
sum += (window[t + h] - mean) * (window[t] - mean);
}
float gamma = (sum / window.Length) / (window.Length - h);
if (gamma > highest)
{
highest = gamma;
}
float norm = highest / (gammaZero / window.Length);
gammaA[h - sampleOffsetLow] = norm;
}
// Here we normalise the peak value so it is between 0 and 1
float normalised = highest / (gammaZero / window.Length);
LogMT.SendStreamValue("MTsoL", sampleOffsetLow);
LogMT.SendStreamValue("MTsoH", sampleOffsetHigh);
LogMT.SendStreamValueBlock("MTatc", gammaA);
return(normalised);
}
void initialize(float yinSampleRate, int yinBufferSize)
{
bufferSize = yinBufferSize;
sampleRate = yinSampleRate;
halfBufferSize = bufferSize / 2;
threshold = 0.6; //was 0.15
probability = 0.0f;
//initialize array and set it to zero
yinBuffer = new float[halfBufferSize];
for (int i = 0; i < halfBufferSize; i++)
{
yinBuffer[i] = 0;
}
LogMT.Log("Yin sample rate: " + yinSampleRate);
LogMT.Log("Yin buffer size: " + yinBufferSize);
LogMT.Log("Yin threshold: " + threshold);
}
/// <summary>
/// Change the microphone to the default microphone. Will fail if user authorisation has not
/// been obtained or there are no microphones.
/// </summary>
public void UseDefaultDevice()
{
if (Application.HasUserAuthorization(UserAuthorization.Microphone))
{
if (Microphone.devices.Length > 0)
{
microphoneDeviceName = "";
microphoneDeviceSet = true;
SetSamplingRate();
LogMT.Log("MicrophoneController: Using default microphone");
}
else
{
LogMT.LogError("MicrophoneController: Cannot set device: No devices available", this);
}
}
else
{
LogMT.LogError("MicrophoneController: Cannot set device: User Authorization required", this);
}
}
/// <summary>
/// Change the microphone to the given ID. Will fail if user authorisation has not been obtained
/// or device doesn't exist.
/// </summary>
public void SetDevice(int id)
{
if (Application.HasUserAuthorization(UserAuthorization.Microphone))
{
if ((id >= 0) && (Microphone.devices.Length > 0))
{
microphoneDeviceName = Microphone.devices[id];
LogMT.Log("MicrophoneController: Using microphone: " + microphoneDeviceName);
microphoneDeviceSet = true;
SetSamplingRate();
}
else
{
LogMT.LogError("MicrophoneController: Cannot set device: Device not available", this);
}
}
else
{
LogMT.LogError("MicrophoneController: Cannot set device: User Authorization required", this);
}
}
/// <summary>
/// Start microphone access and collecting samples. Wait for a SoundEvent.BufferReady signal
/// through OnSoundEvent() before attempting to access sample data.
/// </summary>
private void StartListening()
{
if (testClip != null)
{
audioClip = testClip;
channels = audioClip.channels;
sampleRate = audioClip.frequency;
}
else
{
audioClip = Microphone.Start(microphoneDeviceName, true, 1, sampleRate);
channels = 1; // Fetching the number of channels from the audio clip gives incorrect
// results, possibly due to a Unity bug
}
LogMT.Log("Audio Channels: " + channels);
listening = true;
waitingForAudio = true;
gameObject.SendMessage("OnSoundEvent", SoundEvent.AudioStart, SendMessageOptions.DontRequireReceiver);
}
