/// <summary>
/// Updates the meters.
/// </summary>
private void UpdateMeters()
{
if (m_audioRecorder.Recording)
{
m_audioRecorder.UpdateMeters();
var normalizedValue = Math.Pow(10, m_audioRecorder.AveragePower(0) / 20);
mMusicFlowView.WaveColor = RecordingTintColor;
mMusicFlowView.UpdateWithLevel((nfloat)normalizedValue);
this.NavigationItem.Title = NSStringExtensions.TimeStringForTimeInterval(m_audioRecorder.currentTime);
}
else if (m_audioPlayer != null && m_audioPlayer.Playing)
{
m_audioPlayer.UpdateMeters();
var normalizedValue = Math.Pow(10, m_audioPlayer.AveragePower(0) / 20);
mMusicFlowView.WaveColor = PlayingTintColor;
mMusicFlowView.UpdateWithLevel((nfloat)normalizedValue);
}
else
{
mMusicFlowView.WaveColor = NormalTintColor;
mMusicFlowView.UpdateWithLevel(0);
}
}
private void UpdateMeters()
{
_recorder.UpdateMeters();
nfloat normalizedValue = (nfloat)Math.Pow(10, _recorder.AveragePower(0) / 20);
WaveformView.UpdateWithLevel(normalizedValue);
}
public void UpdateMeter()
{
try{
recorder.UpdateMeters();
//lblDisplay.Text = recorder.PeakPower(0).ToString ();
if (recorder.PeakPower(0) == 0)
{
UserKnocked();
}
}catch {
}
}
protected override async Task <List <Datum> > PollAsync(CancellationToken cancellationToken)
{
AVAudioRecorder recorder = null;
string recordPath = Path.GetTempFileName();
try
{
AVAudioSession audioSession = AVAudioSession.SharedInstance();
NSError error = audioSession.SetCategory(AVAudioSessionCategory.Record);
if (error != null)
{
throw new Exception("Failed to initialize iOS audio recording session: " + error.LocalizedDescription);
}
error = audioSession.SetActive(true);
if (error != null)
{
throw new Exception("Failed to make audio session active: " + error.LocalizedDescription);
}
recorder = AVAudioRecorder.Create(NSUrl.FromFilename(recordPath), new AudioSettings(_settings), out error);
if (error != null)
{
throw new Exception("Failed to create sound recorder: " + error.LocalizedDescription);
}
recorder.MeteringEnabled = true;
// we need to take a meter reading while the recorder is running, so record for one second beyond the sample length
if (recorder.RecordFor(SampleLengthMS / 1000d + 1))
{
await Task.Delay(SampleLengthMS);
recorder.UpdateMeters();
double decibels = 100 * (recorder.PeakPower(0) + 160) / 160f; // range looks to be [-160 - 0] from http://b2cloud.com.au/tutorial/obtaining-decibels-from-the-ios-microphone
return(new Datum[] { new SoundDatum(DateTimeOffset.UtcNow, decibels) }.ToList());
}
else
{
throw new Exception("Failed to start recording.");
}
}
finally
{
try
{
File.Delete(recordPath);
}
catch (Exception ex)
{
SensusServiceHelper.Get().Logger.Log("Failed to delete sound file: " + ex.Message, LoggingLevel.Debug, GetType());
}
if (recorder != null)
{
try
{
recorder.Stop();
}
catch (Exception) { }
try
{
recorder.Dispose();
}
catch (Exception) { }
}
}
}
private void OnTimedEvent(Object source, ElapsedEventArgs e)
{
_recorder.UpdateMeters();
}