/// <summary>
/// OnAudioFilterRead is used to capture live microphone audio when recording or recognizing.
/// When OnAudioFilterRead is implemented, Unity inserts a custom filter into the audio DSP chain.
/// The filter is inserted in the same order as the MonoBehaviour script is shown in the inspector.
/// OnAudioFilterRead is called every time a chunk of audio is sent to the filter (this happens
/// frequently, every ~20ms depending on the sample rate and platform).
/// </summary>
/// <param name="data">The audio data is an array of floats ranging from[-1.0f;1.0f]. Here it contains
/// audio from AudioClip on the AudioSource, which itself receives data from the microphone.</param>
/// <param name="channels"></param>
void OnAudioFilterRead(float[] data, int channels)
{
//Debug.Log($"Received audio data of size: {data.Length} - First sample: {data[0]}");
Debug.Log($"Received audio data: {channels} channel(s), size {data.Length} samples.");
if (isRecording || isRecognizing)
{
byte[] audiodata = ConvertAudioClipDataToInt16ByteArray(data);
for (int i = 0; i < data.Length; i++)
{
// Mute all the samples to avoid audio feedback into the microphone
data[i] = 0.0f;
}
if (isRecording) // We're only concerned with saving all audio data if we're persist to a file
{
recordingData.AddRange(audiodata);
recordingSamples += audiodata.Length;
}
else // if we're not recording, then we're in recognition mode
{
recoServiceClient.SendAudioPacket(requestId, audiodata);
}
}
}
/// <summary>
/// OnAudioFilterRead is used to capture live microphone audio when recording or recognizing.
/// When OnAudioFilterRead is implemented, Unity inserts a custom filter into the audio DSP chain.
/// The filter is inserted in the same order as the MonoBehaviour script is shown in the inspector.
/// OnAudioFilterRead is called every time a chunk of audio is sent to the filter (this happens
/// frequently, every ~20ms depending on the sample rate and platform).
/// </summary>
/// <param name="data">The audio data is an array of floats ranging from[-1.0f;1.0f]. Here it contains
/// audio from AudioClip on the AudioSource, which itself receives data from the microphone.</param>
/// <param name="channels"></param>
void OnAudioFilterRead(float[] data, int channels)
{
try
{
//Debug.Log($"Received audio data of size: {data.Length} - First sample: {data[0]}");
// Debug.Log($"Received audio data: {channels} channel(s), size {data.Length} samples.");
float maxAudio = 0f;
//Debug.Log($"Received audio data: {channels} channel(s), size {data.Length} samples.");
if (isRecording || isRecognizing)
{
byte[] audiodata = ConvertAudioClipDataToInt16ByteArray(data);
for (int i = 0; i < data.Length; i++)
{
if (UseClientSideSilenceDetection)
{
// Get the max amplitude out of the sample
maxAudio = Mathf.Max(maxAudio, Mathf.Abs(data[i]));
}
// Mute all the samples to avoid audio feedback into the microphone
data[i] = 0.0f;
}
if (UseClientSideSilenceDetection)
{
// Was THIS sample silent?
bool silentThisSample = (maxAudio <= SilenceThreshold);
if (silentThisSample)
{
// Yes this sample was silent.
// If we haven't been in silence yet, notify that we're entering silence
if (!isSilent)
{
Debug.Log($"Silence Starting... ({maxAudio})");
isSilent = true;
silenceStarted = DateTime.Now.Ticks; // Must use ticks since Unity's Time class can't be used on this thread.
silenceNotified = false;
}
else
{
// Looks like we've been in silence for a while.
// If we haven't already notified of a timeout, check to see if a timeout has occurred.
if (!silenceNotified)
{
// Have we crossed the silence threshold
TimeSpan duration = TimeSpan.FromTicks(DateTime.Now.Ticks - silenceStarted);
if (duration.TotalSeconds >= SilenceTimeout)
{
Debug.Log("Silence Timeout");
// Mark notified
silenceNotified = true;
// Notify
OnSpeechEnded();
}
}
}
}
else
{
// No this sample was not silent.
// Check to see if we're leaving silence.
if (isSilent)
{
Debug.Log($"Silence Ended ({maxAudio})");
// No longer silent
isSilent = false;
}
}
}
if (isRecording) // We're only concerned with saving all audio data if we're persist to a file
{
recordingData.AddRange(audiodata);
recordingSamples += audiodata.Length;
}
else // if we're not recording, then we're in recognition mode
{
recoServiceClient.SendAudioPacket(requestId, audiodata);
}
}
}
catch (Exception ex)
{
string msg = String.Format("Error: Something went wrong when reading live audio data from the microphone. See error details below:{0}{1}{2}{3}",
Environment.NewLine, ex.ToString(), Environment.NewLine, ex.Message);
Debug.LogError(msg);
UpdateUICanvasLabel(msg, FontStyle.Normal);
}
}