/// <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);
}
}
void Refresh()
{
bool success = false;
// if we have no queue, but still have levels, gradually bring them down
if (player == null)
{
float maxLvl = -1f;
DateTime thisFire = DateTime.Now;
// calculate how much time passed since the last draw
var timePassed = (thisFire - peakFalloffLastFire).TotalSeconds;
foreach (var thisMeter in sublevelMeters)
{
float newPeak, newLevel;
newLevel = (float)(thisMeter.Level - timePassed * kLevelFalloffPerSec);
if (newLevel < 0)
{
newLevel = 0;
}
thisMeter.Level = newLevel;
if (showPeaks)
{
newPeak = (float)(thisMeter.PeakLevel - timePassed * kPeakFalloffPerSec);
if (newPeak < 0)
{
newPeak = 0;
}
thisMeter.PeakLevel = newPeak;
if (newPeak > maxLvl)
{
maxLvl = newPeak;
}
}
else if (newLevel > maxLvl)
{
maxLvl = newLevel;
}
thisMeter.SetNeedsDisplay();
}
// stop the timer when the last level has hit 0
if (maxLvl <= 0)
{
updateTimer.Invalidate();
updateTimer = null;
}
peakFalloffLastFire = thisFire;
success = true;
}
else
{
player.UpdateMeters();
for (int i = 0; i < channelNumbers.Length; i++)
{
int channelIdx = channelNumbers [i];
LevelMeter channelView = sublevelMeters [channelIdx];
if (channelIdx >= channelNumbers.Length)
{
goto bail;
}
if (channelIdx > 127)
{
goto bail;
}
channelView.Level = meterTable.ValueAt(player.AveragePower((uint)i));
if (showPeaks)
{
channelView.PeakLevel = meterTable.ValueAt(player.PeakPower((uint)i));
}
else
{
channelView.PeakLevel = 0;
}
channelView.SetNeedsDisplay();
success = true;
}
}
bail:
if (!success)
{
foreach (var thisMeter in sublevelMeters)
{
thisMeter.Level = 0; thisMeter.SetNeedsDisplay();
}
Console.WriteLine("ERROR: metering failed\n");
}
}