public AudioMeter(EndpointVolume.IAudioMeterInformation audioMeterInformation, SignalRatio minimumLevel, System.TimeSpan minimumDuration, System.TimeSpan Period)
{
AudioMeterInformation = audioMeterInformation;
MinimumLevel = minimumLevel;
MinimumDuration = minimumDuration;
Timer = new System.Timers.Timer(Period.TotalMilliseconds)
{
AutoReset = true,
};
Timer.Elapsed += Timer_Elapsed;
// TODO: we could make this more efficient when no audio is playing by using IAudioSessionNotification and IAudioSessionEvents, so that we don't poll when no audio session is active.
Timer.Start();
}
public AudioMeterEvent(
string audioDeviceId,
SignalRatio minimumLevel,
System.TimeSpan minimumDuration,
System.TimeSpan period,
System.TimeSpan keepaliveInterval,
System.TimeSpan keepaliveDuration,
Logger logger)
{
MinimumLevel = minimumLevel;
MinimumDuration = minimumDuration;
KeepaliveInterval = keepaliveInterval;
KeepaliveDuration = keepaliveDuration;
Logger = logger;
var deviceEnumerator = new MMDeviceAPI.MMDeviceEnumerator();
MMDeviceAPI.IMMDevice device;
try
{
device = deviceEnumerator.GetDeviceById(audioDeviceId);
}
catch (System.Exception exception)
{
throw new System.Exception("Unable to get audio device using specified ID", exception);
}
IAudioMeterInformation = device.ActivateInterface <EndpointVolume.IAudioMeterInformation>();
Period = period;
if (Period <= System.TimeSpan.Zero)
{
Period = new System.TimeSpan(minimumDuration.Ticks / 8);
device.ActivateInterface <AudioClient.IAudioClient>().GetDevicePeriod(out var defaultDevicePeriod, out var minimumDevicePeriodTicks);
var minimumDevicePeriod = new System.TimeSpan(minimumDevicePeriodTicks);
if (Period < minimumDevicePeriod)
{
Period = minimumDevicePeriod;
}
}
Logger.Log("Using minimum level: " + MinimumLevel + ", minimum duration: " + MinimumDuration + ", period: " + Period + ", keepalive interval: " + KeepaliveInterval + ", keepalive duration: " + KeepaliveDuration);
}
void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs elapsedEventArgs)
{
AudioMeterInformation.GetPeakValue(out var peakFactor);
var peakLevel = new SignalRatio {
Factor = peakFactor
};
if (peakLevel < MinimumLevel)
{
lock (CurrentDurationMutex) CurrentDuration = System.TimeSpan.Zero;
}
lock (CurrentDurationMutex)
{
CurrentDuration += System.TimeSpan.FromMilliseconds(Timer.Interval);
if (CurrentDuration < MinimumDuration)
{
return;
}
}
SoundDetected(this, new SoundDetectedEventArgs {
PeakLevel = peakLevel
});
}
